TW201832444A - Power supply circuit - Google Patents

Abstract

The purpose of the power supply circuit according to the present invention is to prevent overvoltage to a switching element connected in series with a power source, while ensuring the versatility of a power source module. A power supply circuit (1) is provided with a plurality of serially connected power source modules (12), and supplies power to a load (20) provided in a vehicle (30). The plurality of power source modules (12) each include a power source (121) and a switching element (122). The power supply circuit (1) is provided with a plurality of diodes (14) that are connected in parallel with the respective power source modules (12) on one-to-one basis. Each of the diodes (14) permits a flow of electric current from a first connection point (132) for connecting the diode (14) and a negative electrode of the power source (121) to each other, to a second connection point (131) for connecting the diode (14) and a positive electrode of the power source (121) to each other, but do not permit a flow of electric current from the second connection point (131) to the first connection point (132).

Description

Power supply circuit

The present invention relates to a power supply circuit that supplies power to a load provided in a vehicle.

Regarding vehicles, in addition to vehicles using only an engine as a driving source, there are vehicles (electric vehicles) using only a motor as a driving source, and vehicles (hybrid vehicles) using an engine and a motor as a driving source. A vehicle using a motor as a drive source, such as an electric vehicle or a hybrid vehicle, is provided with a power supply circuit that supplies power to a load such as a motor. The power supply circuit includes a power module. The power module includes a power source (such as a secondary battery) and a switching element connected in series with the power source. The withstand voltage of the switching element is set taking into consideration the voltage applied to the load by the power supply circuit. In order to increase the voltage applied to the load by the power supply circuit, the power supply circuit may have a plurality of power modules connected in series. In this case, the withstand voltage required for each of the switching elements provided in the plurality of power supply modules is set by taking into consideration the voltage applied to the load by the power supply circuit. There are cases where the same type of power supply module is used despite the types of vehicles. In this case, there are cases where the number of power supply modules included in the power supply circuit differs depending on the type of vehicle. Thereby, the output of the motor in various types of vehicles can be made different. In addition, when the power source is a secondary battery, the maximum distance that can be driven by a single charge can be made different in various types of vehicles. When the number of power supply modules in the power supply circuit differs depending on the type of vehicle, in order to improve the versatility of the power supply module, as a switching element, for example, it may be considered to use the situation with the largest number of power supply modules Voltage-resistant switching elements. In this case, when the number of power supply modules is less than the maximum number, a switching element having a higher withstand voltage than the originally required minimum withstand voltage is used in the power supply circuit. Here, the higher the withstand voltage of the switching element, the higher the resistance of the switching element in the on state. Therefore, the higher the withstand voltage of the switching element, the greater the amount of heat generated by the switching element when energized. Therefore, in the case of using a switching element having a withstand voltage that is sufficiently higher than the originally required withstand voltage, more thermal measures need to be taken than in the case of using a switching element with the minimum required withstand voltage. . Furthermore, when switching elements having different withstand voltages are used according to the number of power supply modules, although the amount of heat generated can be suppressed, the versatility of the power supply module is reduced. Japanese Patent Laid-Open No. 2015-91200 discloses a vehicle in which a plurality of battery packs (equivalent to the above-mentioned power supply module) are detachably mounted. Each of the plurality of battery packs includes a secondary battery, a battery pack-side switching element, and a BMS (Battery Management System). The battery pack-side switching element is a switching element that blocks output from the secondary battery to the outside. The battery pack-side switching element is connected in series with the secondary battery. BMS controls the charge and discharge of secondary batteries. In the above publication, an ECU (Engine Control Unit) and a vehicle-side switching element are provided in the vehicle. The ECU communicates with the information communication circuit included in the BMS. The on / off of the switch element on the vehicle side is controlled by the ECU. In the above-mentioned publication, the ECU turns on the vehicle-side switching element when all the battery pack-side switching elements of the battery pack (battery module) are turned on. Thereby, the battery pack-side switching element can be prevented from being damaged due to the potential difference between the two ends of the battery-side switching element, and a switching element with the lowest withstand voltage can be used as the battery-side switching element. [Prior Art Literature] [Patent Literature] [Patent Literature 1] Japanese Patent Laid-Open No. 2015-91200

[Problems to be Solved by the Invention] However, in the above publication, communication is required between the BMS and the ECU. Therefore, the versatility of the power module (battery pack) is low. An object of the present invention is to provide a power supply circuit that can ensure the versatility of a power supply module and prevent overvoltage to a switching element connected in series with a power supply. [Technical means to solve the problem] In order to ensure the versatility of the power supply module, the inventor of the present case has studied the configuration that does not require communication between the power supply module and the vehicle. Furthermore, research was focused on the structure of the power supply circuit itself. As a result, it was possible to obtain a knowledge that a diode provided in parallel with the power module can be provided. The present invention has been completed based on such findings. (1) The power supply circuit of the present invention is a power supply circuit provided with a plurality of power supply modules connected in series to supply power to a load provided in a vehicle. Each of the plurality of power supply modules includes a power supply for supplying power and a switching element connected in series with the power supply. The power supply circuit further includes a plurality of diodes connected in parallel with each of the plurality of power supply modules one by one. Each of the plurality of diodes is configured in such a manner that a permissible current flows from a first connection point connecting the diode to a negative electrode of the power source to a second connection connecting the diode to a positive electrode of the power source Point, but current is not allowed to flow from the second connection point to the first connection point. In a power supply circuit having a plurality of switching elements, there are cases where the timings of switching the plurality of switching elements to be turned on or off are staggered for some reason. There are cases where the switching element requires a response time. Therefore, it is difficult to completely synchronize the on / off operations of the plurality of switching elements. As a result, the timing of switching the plurality of switching elements on or off may be staggered. In addition, when a failure (short circuit) occurs in any one of the plurality of switching elements, the timing of switching the plurality of switching elements to ON or OFF is also shifted. Imagine a situation where, for some reason, only one of the plurality of switching elements is switched off. Assuming that the diode is not connected in parallel with the switching element, in this case, the potential difference between the two ends of the switching element in the off state is greater than the output voltage of one power source. There may be cases where the potential difference between the two ends of the switching element in the off state is approximately the same as the total output voltage of the plurality of power sources. Therefore, the switching element may be damaged due to a potential difference between both ends of the switching element in an off state. Therefore, when no diode is provided, the switching element is required to have a high withstand voltage. On the other hand, the power supply circuit of the present invention includes a plurality of diodes connected in parallel with each of the plurality of switching elements one by one. Among the two connection points connecting the diode and the power module, the connection point connected to the negative electrode of the power supply is set as the first connection point, and the connection point connected to the positive electrode of the power supply is set as the second connection point. The diode allows current to flow from the first connection point to the second connection point, but does not allow current to flow from the second connection point to the first connection point. Therefore, when, for some reason, only one of the plurality of switching elements is switched to off, a current flows to the diode connected in parallel with the switching element in the off state. Thereby, the potential difference across the switching element in the off state can be reduced to approximately the same level as the output voltage of one power source. Therefore, regardless of the number of power supply modules in the power supply circuit, switching elements with the same withstand voltage can be used. That is, it can not only ensure the universality of the power supply module, but also prevent overvoltage to the switching elements. In addition, the diode is connected not only in parallel with the switching element, but also in parallel with the power source, so that the withstand voltage required by the diode can be reduced. (2) According to another aspect, the power supply circuit of the present invention preferably has the following configuration. The switching element is a switching element capable of being electrically controlled. (3) According to another aspect, the power supply circuit of the present invention preferably has the following configuration. At least one of the plurality of power modules can be attached to and detached from the vehicle body of the vehicle. According to this configuration, since the power supply module can be attached to and detached from the vehicle body, the versatility of the power supply module can be improved. (4) According to another aspect, the power supply circuit of the present invention preferably has the following configuration. Each of the at least one power supply module among the plurality of power supply modules can be attached to and detached from the vehicle body integrally with the diodes connected in parallel to the power supply module. According to this configuration, since the power supply module and the diode can be integrally attached to and detached from the vehicle body, the versatility of the power supply module can be further improved. Specifically, for example, it is assumed that there is a vehicle that includes a previous power supply circuit without a diode, and a power supply module that is detachably mounted with the power supply circuit. The vehicle can be equipped with an integrated power module and a diode to replace the previous power module. Furthermore, the "at least one power supply module" in (4) above may be the same as the "at least one power supply module" in (3) above, or the "at least one power supply module" in (3) above Group ". (5) According to another aspect, the power supply circuit of the present invention preferably has the following configuration. Each of the plurality of power supply modules can be attached to and detached from the vehicle body integrally with the diodes connected in parallel to the power supply module. The at least two power modules can be attached to and detached from the vehicle body individually. According to this configuration, since at least two power supply modules can be individually attached to and detached from the vehicle body, the plurality of power supply modules are not integrated. Therefore, vehicles with different numbers of power modules can also use the same power module. In this way, the versatility of the power module can be further improved. In addition, when a failure occurs in one of the plurality of power supply modules, only the power supply module that has failed may be replaced. Furthermore, the "at least two power modules" in (5) above may be the same as the "at least one power module" in (4) above, or the "at least one power module in (4) above" Group ". (6) According to another aspect, the power supply circuit of the present invention preferably has the following configuration. Each of the plurality of power supply modules can be attached to and detached from the vehicle body integrally with the diodes connected in parallel to the power supply module. The at least two power modules can be integrally attached to and detached from the vehicle body. According to this configuration, since at least two power supply modules can be integrally attached to and detached from the vehicle body, compared with the case where at least two power supply modules can be individually attached to and detached from the vehicle body, it is possible to reduce the amount of time required to attach to the vehicle. The number of connection parts of the power supply module that are mounted on the main body. Therefore, attachment and detachment can be performed more easily. Furthermore, the "at least two power modules" in (6) above may be the same as the "at least one power module" in (4) above, or the "at least one power module in (4) above" Group ". (7) According to another aspect, the power supply circuit of the present invention preferably has the following configuration. Each of the plurality of power supply modules can be attached to and detached from the vehicle body including the diode connected in parallel with the power supply module. According to this configuration, when the power supply module is replaced, the diode can be used directly without replacing the diode. Accordingly, the cost of the diode can be reduced. In addition, since the element to be attached and detached does not include a diode, the element to be attached and detached can be miniaturized. Furthermore, the "at least one power supply module" in (7) above may be the same as the "at least one power supply module" in (3) above, or the "at least one power supply module" in (3) above Group ". (8) According to another aspect, the power supply circuit of the present invention preferably has the following configuration. At least one power source among the plurality of power sources of the plurality of power source modules can be attached to and detached from the vehicle body of the vehicle. Each of the at least one power source among the plurality of power sources included in the plurality of power source modules can be opposite to the above-mentioned switching element included in the power source module including the power source and the diode connected in parallel with the power source. The above vehicle body. According to this configuration, when the power supply is replaced, the diode and the switching element can be used without replacement. Accordingly, the cost of the diode and the switching element can be reduced. In addition, since the elements to be attached and detached do not include a diode and a switching element, the elements to be attached and detached can be miniaturized. (9) According to another aspect, the power supply circuit of the present invention preferably has the following configuration. At least one of the plurality of power modules cannot be attached to or detached from the vehicle body of the vehicle. According to this configuration, compared with a case where the power supply module is made detachable, it is possible to reduce the vibration resistance and shock resistance required of the power supply module. This can not only ensure the versatility of the power module, but also make the power module compact. (10) According to another aspect, the power supply circuit of the present invention preferably has the following configuration. The power sources included in the plurality of power supply modules are power storage devices capable of storing power or power generation devices capable of generating power. According to this configuration, the versatility of the power module can be further improved. <Definition of terms> The so-called bipolar system refers to a device that has the characteristics of allowing the flow of current in a single direction. In the present invention, the so-called plurality of diodes and each of the plurality of power modules are connected in parallel one by one, and it also means that the plurality of diodes and the plurality of power modules are connected in parallel respectively. In the present invention, the switching element capable of being electrically controlled refers to a switching element that is controlled to be turned on / off by an electric signal. [Effects of the Invention] According to the power supply circuit of the present invention, the universality of the power supply module can be ensured, and overvoltage on the switching elements connected in series with the power supply can be prevented.

<Embodiment of the present invention> The power supply circuit 1 according to the embodiment of the present invention supplies power to a load 20 provided in the vehicle 30. The power supply circuit 1 includes a plurality of (two in FIG. 1) power supply modules 12 and 12 connected in series. Each of the plurality of power supply modules 12 and 12 includes a power supply 121 for supplying power and a switching element 122 connected in series with the power supply 121. The power supply circuit 1 further includes a plurality of diodes 14 and 14 connected in parallel with each of the plurality of power supply modules 12 and 12 one by one. The first connection point 132 connects the diode 14 to the negative electrode of the power source 121. Among the two connection points connecting the diode 14 and the power module 12, the connection point of the negative electrode connected to the power supply 121 is set as the first connection point 132, and the connection point of the positive electrode connected to the power supply 121 is set as the first connection point. 2 连接 点 131。 2 connecting point 131. Each of the plurality of diodes 14 and 14 is configured to allow current to flow from the first connection point 132 to the second connection point 131, but not to allow current to flow from the second connection point 131 to the first connection point 132. In a power supply circuit having a plurality of switching elements, there are cases where the timings of switching the plurality of switching elements to be turned on or off are staggered for some reason. There are cases where the switching element requires a response time. Therefore, it is difficult to completely synchronize the on / off operations of the plurality of switching elements. As a result, the timing of switching the plurality of switching elements on or off may be staggered. In addition, when a failure (short circuit) occurs in any one of the plurality of switching elements, the timing of switching the plurality of switching elements to ON or OFF is also shifted. Imagine a situation where, for some reason, only one of the plurality of switching elements is switched off. Assuming that the diode is not connected in parallel with the switching element, in this case, the potential difference between the two ends of the switching element in the off state is greater than the output voltage of one power source. There may be cases where the potential difference between the two ends of the switching element in the off state is approximately the same as the total output voltage of the plurality of power sources. Therefore, the switching element may be damaged due to a potential difference between both ends of the switching element in an off state. Therefore, when no diode is provided, the switching element is required to have a high withstand voltage. On the other hand, the power supply circuit 1 of the present invention includes a plurality of diodes 14 and 14 connected in parallel to each of the plurality of switching elements 122 and 122 one by one. The diode 14 allows current to flow from the first connection point 132 to the second connection point 131, but does not allow current to flow from the second connection point 131 to the first connection point 132. Therefore, when, for some reason, only one of the plurality of switching elements 122 and 122 is switched to the off state, a current flows to the diode 14 connected in parallel with the switching element 122 in the off state. Thereby, the potential difference across the switching element 122 in the off state can be reduced to approximately the same level as the output voltage of one power source 121. Therefore, regardless of the number of the power supply modules 12 included in the power supply circuit 1, the switching elements 122 having the same withstand voltage can be used. That is, it is possible to ensure the versatility of the power supply module 12 and prevent overvoltage to the switching element 122. In addition, the diode 14 is not only connected in parallel with the switching element 122 but also in parallel with the power source 121, so that the withstand voltage required by the diode 14 can be reduced. <A specific example of the embodiment of the present invention> Next, a specific example of the embodiment of the present invention will be described with reference to FIGS. 2 to 4. Basically, the specific example of the embodiment of the present invention has all the features of the embodiment of the present invention described above. The description of the same parts as those of the embodiment of the present invention is omitted. The power supply circuit 10 is an example of the power supply circuit 1 of the above embodiment. The power supply circuit 10 supplies power to a load 20 included in a vehicle 30. The vehicle 30 is, for example, a locomotive. The load 20 of the vehicle 30 is not particularly limited as long as it is a person driven by being supplied with electric power. The load 20 may be, for example, a device including an electrolytic capacitor and a resistor as shown in FIG. 2. The load 20 may be, for example, a motor used as a driving source of the vehicle 30. The load 20 may be, for example, a starter motor for starting the engine. The starter motor is not a motor that is a driving source of the vehicle 30. The load 20 may be, for example, a security component (a meter, a horn, a car light, etc.). The load 20 may be a heating sheet, for example. In the case where the load 20 is a motor as a drive source, the vehicle 30 is not particularly limited as long as it uses a motor as a drive source. Specifically, for example, the vehicle 30 may be a vehicle (electric vehicle) using only a motor as a driving source, or a vehicle (hybrid vehicle) using an engine and a motor as driving sources. In a case where the load 20 is not a motor as a driving source, the vehicle 30 may be a person using the motor as a driving source, or may not be a person using the motor as a driving source. Specifically, for example, the vehicle 30 may be a vehicle (engine vehicle) using only an engine as a driving source, or a vehicle (electric vehicle) using only a motor as a driving source, or may be a vehicle having an engine and a motor as driving sources Vehicle (hybrid vehicle). The power supply circuit 10 includes a plurality of power supply modules 12A and 12B and a plurality of diodes 14A and 14B. A plurality of power modules 12A and 12B are connected in series. The diode 14A is connected in parallel with the power module 12A. The diode 14B is connected in parallel with the power module 12B. That is, the plurality of diodes 14A and 14B are connected in series. The power module 12A and the diode 14A are connected through two connection points 131A and 132A. The power module 12B and the diode 14B are connected through two connection points 131B and 132B. The power supply modules 12A and 12B are examples of the power supply module 12 in the above embodiment. The diodes 14A and 14B are an example of the diode 14 in the above embodiment. The connection points 131A and 131B are examples of the connection points 131 in the above embodiment. The connection points 132A and 132B are examples of the connection points 132 in the above embodiment. The connection points 131A and 131B correspond to the second connection point of the present invention, and the connection points 132A and 132B correspond to the first connection point of the present invention. The power module 12A includes a power source 121A and a switching element 122A. The power module 12B includes a power source 121B and a switching element 122B. The switching element 122A is connected in series to the power source 121A. The switching element 122B is connected in series to the power source 121B. The power sources 121A and 121B are examples of the power source 121 in the above embodiment. The switching elements 122A and 122B are examples of the switching element 122 in the above embodiment. The power sources 121A and 121B are DC power sources. The power sources 121A and 121B are not particularly limited as long as they are capable of supplying power. Each of the power sources 121A and 121B has a positive electrode and a negative electrode as a pair of terminals. The power sources 121A and 121B have the same configuration. The power sources 121A and 121B may have different configurations. The power sources 121A and 121B may be power storage devices capable of storing power. Examples of the power storage device include a primary battery and a secondary battery. The secondary battery may be, for example, a lead storage battery or a lithium ion battery. As another example of the power storage device, a capacitor or an ultracapacitor may be used. The so-called super capacitor refers to an electric double layer capacitor. Another example of the power storage device may be a stabilized power supply. The stabilized power supply is a DC power supply with the function of stabilizing the output voltage. The stabilized power source may include, for example, a secondary battery, and is configured to stabilize the output voltage of the secondary battery. The power sources 121A and 121B may be power generation devices capable of generating electricity without storing electric power. An example of a power generation device is a fuel cell that generates power by a chemical reaction of a fuel. The fuel is, for example, hydrogen, hydrocarbon, alcohol, or the like. As another example of a power generation device, for example, a solar cell that converts solar light energy into electricity can be used. The power supply 121A (121B) may be a device provided with a plurality of power supply elements capable of supplying power alone. For example, in the case where the power source 121A (121B) is a secondary battery, the power source 121A (121B) may be a unit cell (power source element) or a battery pack composed of a plurality of unit cells. A plurality of power supply elements may be connected in series or in parallel, and a combination of series and parallel connections may also be used. The switching elements 122A and 122B can be switched between a state where current is allowed to flow and a state where current is blocked. The switching elements 122A and 122B are not particularly limited as long as they are capable of being electrically controlled. The so-called electrical control means that on / off is controlled by an electric signal. That is, the switching elements 122A and 122B need only be relays. The switching elements 122A and 122B have the same configuration. The switching elements 122A and 122B may have different configurations. The switching elements 122A and 122B may be, for example, electromagnetic relays (EMS: electro-magnetic relays) or semiconductor relays (SSR: solid-state relays). The semiconductor relay may be, for example, a MOSFET (Metal-Oxide Semiconductor Field-Effect Transistor). MOSFET is a kind of field effect transistor. Semiconductor relays can also be other field-effect transistors, bipolar transistors, or IGBTs (Insulated Gate Bipolar Transistors). The switching elements 122A and 122B may be, for example, contact relays having mechanical contacts, such as electromagnetic relays, or, for example, non-contact relays having no mechanical contacts, such as semiconductor relays. Furthermore, the electromagnetic relay is also called a mechanical relay. The switching element 122A is connected to the positive electrode of the power source 121A. The switching element 122A is disposed between the power source 121A and the connection point 131A. The connection point 131A is a connection point connecting the positive electrode of the power supply 121A and the diode 14A. The switching element 122B is connected to the positive electrode of the power source 121B. The switching element 122B is disposed between the power source 121B and the connection point 131B. The connection point 131B is a connection point connecting the positive electrode of the power supply 121B and the diode 14B. In FIG. 2, the illustration of the control device for electrically controlling the switching elements 122A and 122B is omitted. The switching device 122A is controlled by the control device, for example, in a state where the power source 121A is usable and is turned on, and when the power source 121A is unusable, it is turned off. When the power sources 121A and 121B are lithium-ion batteries, the control device for electrically controlling the switching elements 122A and 122B may be, for example, a BMS (Battery Management System). The diodes 14A and 14B have the same configuration. The diodes 14A and 14B may have different configurations. The diodes 14A and 14B may be, for example, semiconductor diodes. The diodes 14A and 14B may be diodes other than a semiconductor diode (for example, a diode vacuum tube). Each of the diodes 14A and 14B has an anode and a cathode as a pair of terminals. The diode 14A is configured to allow current to flow from the anode to the cathode inside the diode 14A, but not to allow current to flow from the cathode to the anode inside the diode 14A. Like the diode 14A, the diode 14B only allows current to flow from the anode to the cathode. Among the two connection points 131A and 132A connecting the diode 14A to the power module 12A, the connection point 131A connects the diode 14A to the positive electrode of the power supply 121A, and the connection point 132A connects the diode 14A to the negative electrode of the power supply 121A connection. The cathode of the diode 14A is connected to the connection point 131A. The anode of the diode 14A is connected to the electrical connection point 132A. That is, the diode 14A allows current to flow from the connection point 132A to the connection point 131A, but does not allow current to flow from the connection point 131A to the connection point 132A. Among the two connection points 131B and 132B that connect the diode 14B and the power module 12B, the connection point 131B connects the diode 14B to the positive electrode of the power source 121B, and the connection point 132B connects the diode 14B to the negative electrode of the power source 121B. connection. The cathode of the diode 14B is connected to the connection point 131B. The anode of the diode 14B is connected to the connection point 132B. That is, the diode 14B allows current to flow from the connection point 132B to the connection point 131B, but does not allow current to flow from the connection point 131B to the connection point 132B. The vehicle 30 includes a vehicle body 31, a plurality of power supply modules 12A, 12B, and a plurality of diodes 14A, 14B. In the specific example of this embodiment, the plurality of power supply modules 12A and 12B and the plurality of diodes 14A and 14B are not included in the vehicle body 31. The plurality of power supply modules 12A and 12B can be attached to and detached from the vehicle body 31. The vehicle 30 includes connectors 161A, 162A, 163A, and 164A so that the power module 12A can be attached to and detached from the vehicle body 31. The connector 161A is connected to a connection point 131A connected to the positive electrode of the power source 121A. The connector 162A is connected to a connection point 132A connected to the negative electrode of the power source 121A. The connectors 161A and 162A are integrated with the power module 12A. The connector 161A is detachably connected to the connector 163A. The connector 162A is detachably connected to the connector 164A. The connectors 163A and 164A are provided integrally with the vehicle body 31, respectively. Therefore, the connectors 161A and 162A can be attached to and detached from the connectors 163A and 164A included in the vehicle body 31 integrally with the power module 12A. As shown in FIG. 2, the state where the connector 161A is connected to the connector 163A and the connector 162A is connected to the connector 164A is a state where the power supply module 12A is mounted on the vehicle body 31. The vehicle 30 includes connectors 161B, 162B, 163B, and 164B so that the power source module 12B can be attached to and detached from the vehicle body 31. The connector 161B is connected to a connection point 131B connected to the positive electrode of the power source 121B. The connectors 161B and 162B are integrated with the power module 12B. The connector 162B is connected to a connection point 132B connected to the negative electrode of the power source 121B. The connector 161B is detachably connected to the connector 163B. The connector 162B is detachably connected to the connector 164B. The connectors 163B and 164B are provided integrally with the vehicle body 31, respectively. Therefore, the connectors 161B and 162B can be attached to and detached from the connectors 163B and 164B included in the vehicle body 31 integrally with the power module 12B. As shown in FIGS. 2 and 3, the state where the connector 161B is connected to the connector 163B and the connector 162B is connected to the connector 164B is a state where the power supply module 12B is mounted on the vehicle body 31. The two connection points 131A and 132A connecting the power module 12A and the diode 14A are connected to the two connectors 161A and 162A, respectively. Therefore, the power module 12A can be attached to and detached from the vehicle body 31 integrally with the diode 14A. The two connection points 131B and 132B connecting the power module 12B and the diode 14B are connected to the two connectors 161B and 162B, respectively. Therefore, the power module 12B can be attached to and detached from the vehicle body 31 integrally with the diode 14B. That is, each of the plurality of power supply modules 12A and 12B can be attached to and detached from the vehicle body 31 integrally with a diode connected in parallel to the power supply module. Therefore, as shown in FIG. 3, when the power supply module 12A is removed from the vehicle body 31, the diode 14A connected in parallel with the power supply module 12A is also removed from the vehicle body 31. The connection points 131A and 132B located on both sides of the plurality of power supply modules 12A and 12B connected in series are connected to the connectors 161A and 162B, respectively. The connectors 161A and 162B are detachably connected to the connectors 163A and 164B provided in the vehicle body 31, respectively. In addition, the connection points 132A and 131B between the power module 12A and the power module 12B are connected to the connectors 162A and 161B, respectively. The connectors 162A and 161B are detachably connected to the connectors 164A and 163B provided in the vehicle body 31, respectively. Therefore, the plurality of power supply modules 12A and 12B can be individually attached to and detached from the vehicle body 31. That is, the elements including the power module 12A and the diode 14A, and the elements including the power module 12B and the diode 14B can be individually attached to and detached from the vehicle body 31. Therefore, as shown in FIG. 3, in a state where the power source module 12B and the diode 14B are mounted on the vehicle body 31, the power source module 12A and the diode 14A can be removed from the vehicle body 31. The two connectors 161A and 162A connected to one power supply module 12A can be integrated only in the manner of simultaneous removal, and they can also be separated in the manner of individual attachment and detachment. The two connectors 161B and 162B connected to one power supply module 12B can be integrated only by simultaneous attachment and detachment, and can also be separated by individual attachment and detachment. The connectors 161A to 164A and 161B to 164B are DC connectors. The connection structure between the connector 161A and the connector 163A is not particularly limited. The connection structure may be, for example, a plug-in structure or a structure other than a plug-in structure. The connector 161A can be attached to and detached from the connector 163A without using a tool. The connector 161A can also be attached to and detached from the connector 163A using a tool. The connection structure between the connector 162A and the connector 164A is also the same as the connection structure between the connector 161A and the connector 163A. Accordingly, the power module 12A can be attached to and detached from the vehicle body 31 without using a tool. The connection structure between the connector 161B and the connector 163B and the connection structure between the connector 162B and the connector 164B are also the same as the connection structure between the connector 161A and the connector 163A. The vehicle body 31 may also support the power module 12A directly or indirectly by using parts other than the connectors 163A and 164A. The vehicle body 31 may also support the power module 12B directly or indirectly through parts other than the connectors 163B and 164B. The aspect of support may be, for example, only contact. The supported aspect may be, for example, a state in which elements including a power supply module are detachably held in the vehicle body 31 by a magnetic force. The supported aspect may be an aspect in which the elements including the power module can be detachably held in the vehicle body 31 by using the embedded structure of the convex portion and the concave portion. The supported form may be, for example, a form in which elements including a power supply module are detachably held on the vehicle body 31 by a screw structure. The power supply circuit 10 shown in FIG. 2 is a diagram excluding the connectors 161A and 162B. However, the power supply circuit 10 may include connectors 161A and 162B. When the power supply 121A is a chargeable power storage device, the vehicle body 31 and the power supply module 12A may be configured to charge the power supply 121A in a state where the power supply module 12A is mounted on the vehicle body 31. When the power supply 121A is a chargeable power storage device, the power supply module 12A may be configured to charge the power supply 121A in a state where the power supply module 12A is removed from the vehicle body 31. The same applies when the power source 121B is a chargeable power storage device. Each of the plurality of power supply modules 12A and 12B is preferably capable of being attached to and detached from a vehicle body of a vehicle different from the vehicle 30 type. Thereby, the versatility of the power supply modules 12A and 12B can be improved. When the plurality of power supply modules 12A and 12B are mounted on the vehicle body 31, the power supply circuit 10 is connected to the load 20. The voltage of the power supply circuit 10 in a state where the power supply circuit 10 is connected to the load 20 will be described below. First, as shown in FIG. 4, the voltage of the power supply circuit 10 in a case where both of the plurality of switching elements 122A and 122B are in an on state will be described. Set the output voltage of the power supply 121A to V _s . Set the output voltage of the power supply 121B to V _s . Set the voltage at connection point 132B to V ₀ . V ₀ It may or may not be 0 V. The voltage of the negative electrode of the power supply 121B is V ₀ , The voltage of the positive electrode of the power supply 121B is V ₀ + V _s . Therefore, the voltage of the connection point 131B is V ₀ + V _s . The voltage at the connection point 131B is higher than the voltage at the connection point 132B. As described above, the diode 14B does not allow current to flow from the connection point 131B to the connection point 132B. Therefore, no current flows through the diode 14B. The voltage at connection point 132A is V ₀ + V _s . The voltage of the negative electrode of the power supply 121A is V ₀ + V _s , The voltage of the positive electrode of the power supply 121A is V ₀ + 2V _s . Therefore, the voltage at the connection point 131A is V ₀ + 2V _S . The voltage at the connection point 131A is higher than that at the connection point 132A. As described above, the diode 14A does not allow current to flow from the connection point 131A to the connection point 132A. Therefore, no current flows through the diode 14A. The plurality of switching elements 122A, 122B are controlled in such a manner that the timings of switching to off are consistent. However, for some reason, the timings of switching the plurality of switching elements 122A and 122B to OFF may be staggered. FIG. 4 shows a state in which the switching element 122B has not been switched off when the switching element 122A is switched off. As shown in FIG. 4, the voltage of the power supply circuit 10 after the switching element 122A is switched to the off state among the plurality of switching elements 122A and 122B will be described. Set the output voltage of the power supply 121A to V _s . Set the output voltage of the power supply 121B to V _s . Set the voltage at connection point 132B to V ₀ . The voltage of the power circuit in which the power supply module 12B and the diode 14B are connected in parallel is the same as when the above-mentioned switching elements 122A and 122B are both turned on. No current flows through the diode 14B. The voltage at connection point 132A is V ₀ + V _s . Because the switching element 122A has just been turned off, the voltage of the negative electrode of the power source 121A is V ₀ + V _s , The voltage of the positive electrode of the power supply 121A is V _o + 2V _s . Since the switching element 122A is turned off, current does not flow from the power source 121A to the connection point 131A. As described above, the diode 14A allows a current to flow from the connection point 132A to the connection point 131A. Therefore, a current flows from the connection point 132A to the connection point 131A via the diode 14A. The voltage at the connection point 131A is V ₀ + V _s . Therefore, the potential difference between the two ends of the switching element 122A in the OFF state is V _s . In fact, when a current flows through the diode 14A, a voltage drop occurs due to the internal resistance of the diode 14A. However, the amount of voltage drop caused by the internal resistance of the diode 14A is compared to the output voltage V _s It is much smaller, so here we will ignore the amount of voltage drop caused by the internal resistance. The amount of voltage drop due to the internal resistance of the connectors 161B and 162A and the wiring is also ignored and explained for the same reason. After only the switching element 122B of the plurality of switching elements 122A and 122B is switched to the off state, the potential difference between the two ends of the switching element 122B in the off state will immediately become V _s It is almost the same, and detailed descriptions are omitted. Here, for comparison with FIG. 4, FIG. 5 illustrates a power supply circuit 90 after the diodes 14A and 14B are removed from the power supply circuit 10 of FIG. 4. The power supply modules 92A and 92B shown in FIG. 5 have the same configuration as the power supply modules 12A and 12B. The power sources 921A and 921B shown in FIG. 5 have the same configuration as the power sources 121A and 121B. The switching elements 922A and 922B shown in FIG. 5 have the same configuration as the switching elements 122A and 122B. The connectors 961A and 961B shown in FIG. 5 have the same configuration as the connectors 161A and 161B. The connectors 962A and 962B shown in FIG. 5 have the same configuration as the connectors 162A and 162B. FIG. 5 shows a state where only the switching element 922A is switched off among the plurality of switching elements 922A and 922B. The voltage of the power supply circuit 90 at this time will be described. Set the output voltage of the power supply 921A to V _s . Set the output voltage of the power supply 921B to V _s . Set the voltage of connector 962B to V ₀ . The voltage of the negative pole of the power source 921B is V ₀ , The voltage of the positive pole of the power source 921B is V ₀ + V _s . The voltage of the negative pole of the power source 921A is V ₀ + V _s , The voltage of the positive pole of the power source 921A is V ₀ + 2V _S . Since the switching element 922A is in an off state, no current flows from the power supply circuit 90 to the load 20. The voltage of connector 961A is V _o . Therefore, the potential difference between the two ends of the switching element 922A in the off state is 2V _S . In this way, in the power supply circuit 90 having no diode structure, when a plurality of switching elements 922A, 922B are switched to the off timing, the potential difference between the two ends of the switching element in the off state becomes equal to The total output voltage of all power supplies in the power supply circuit is approximately the same. On the other hand, in the power supply circuit 10 of the specific example of this embodiment, when a plurality of switching elements 122A and 122B are switched to the off timing, the potential difference between both ends of the switching element in the off state becomes The output voltage of a power supply connected in parallel with the diode is approximately the same. Therefore, regardless of the total voltage when the vehicle is mounted, as long as it is a switching element that can withstand the voltage of a power supply connected in parallel with the diode, the switching element in the off state can be prevented from being damaged by the potential difference between the two ends. As a result, it is possible to use switching elements with the same withstand voltage regardless of the number of power supply modules included in the power supply circuit, so that the versatility of the power supply module can be improved. The specific examples of the embodiment of the present invention achieve the following effects in addition to the effects of the embodiment of the present invention described above. Since the power module can be attached to and detached from the vehicle body, the versatility of the power module can be improved. Since the power supply module and the diode can be integrally attached to and detached from the vehicle body, the versatility of the power supply module can be further improved. Specifically, for example, it is assumed that there is a vehicle that includes a previous power supply circuit that does not have a diode, and a power supply module that is detachably mounted with the power supply circuit. The vehicle can be equipped with an integrated power module and a diode to replace the previous power module. Since the plurality of power supply modules can be individually attached to and detached from the vehicle body, the plurality of power supply modules are not integrated. Therefore, vehicles with different numbers of power modules can also use the same power module. In this way, the versatility of the power module can be further improved. Moreover, when a failure occurs in one of the plurality of power supply modules, only the power supply module in which the failure has occurred can be replaced. <Modified Examples of the Embodiment of the Present Invention> The present invention is not limited to the above-mentioned embodiments and specific examples, and various changes can be made within the scope described in the scope of patent application. Hereinafter, modified examples of the embodiments of the present invention will be described. In addition, those having the same configuration as the above-mentioned configuration are denoted by the same reference numerals, and descriptions thereof are appropriately omitted. The above-mentioned embodiments, specific examples of the embodiments, and the following modified examples can be implemented in appropriate combination. ♦ Modification Example 1 In the specific example of the embodiment, the switching elements 122A and 122B are connected to the positive poles of the power sources 121A and 121B, respectively. However, in the present invention, each of the plurality of switching elements may be connected to either a negative electrode or a positive electrode of a power supply of a power module including the switching element. FIG. 6 shows an example in which a switching element is connected to a negative electrode of a power source. The power supply circuit 210 shown in FIG. 6 includes a plurality of power supply modules 212A and 212B. The power supply module 212A includes a power supply 121A and a switching element 122A connected to a negative electrode of the power supply 121A. The switching element 122A is connected to a connection point 132A that connects the negative electrode of the power source 121A and the diode 14A. The power module 212B includes a power source 121B and a switching element 122B connected to a negative electrode of the power source 121B. The switching element 122B is connected to a connection point 132B that connects the negative electrode of the power source 121B and the diode 14B. The voltage of the power supply circuit 210 when the switching elements 122A and 122B are switched to the off-time sequence is dependent on the circuit configuration of the load 20, and therefore cannot be clearly described as a specific example of the embodiment. However, this modified example is also the same as the specific example of the embodiment. When the timing of switching between a plurality of switching elements is staggered, the potential difference between both ends of the switching element in the off state can be reduced to that of one power source. The output voltage is approximately the same. ♦ Modification Example 2 The number of power supply modules in the power supply circuit 10 of the specific example of the embodiment is two. However, the number of power supply modules of the power supply circuit of the present invention may be more than two. ♦ Modification 3 In the present invention, the plurality of power supplies of the power supply circuit may include two power sources that are different from each other. The structures may be the same as each other. The difference in the configuration of the power supply includes not only the case where the types of power supply listed in the specific examples of the embodiment are different, but also the case where the size is different or the case where the material is different. When a plurality of power sources are power storage devices, the so-called power source structure is different, for example, including the case where the materials related to the storage of power are different, the charging capacitors are different, the discharging capacitors are different, and the charging rate is 100 In the state of%, the voltage is different, the charging characteristics are different, and the discharging characteristics are different. In the present invention, the plurality of switching elements included in the power supply circuit may include two switching elements having different configurations from each other, or may have the same configuration. In the present invention, the plurality of power supply modules included in the power supply circuit may include two power supply modules having different configurations, or may have the same configuration. In the present invention, the plurality of diodes of the power supply circuit may include two diodes having different configurations from each other, or may have the same configuration. ♦ Modification 4 In the specific example of the embodiment, a part (connectors 164A and 163B) of a plurality of connectors for connecting the power module 12A and the power module 12A in series is provided on the vehicle body 31. In other words, a part of the plurality of connectors for enabling the plurality of power supply modules 12A and 12B to be individually detachable from the vehicle body 31 is provided on the vehicle body 31. However, in the present invention, none of the connectors used to connect the power supply modules in series with each other is provided on the vehicle body. FIG. 7 shows an example in which the connectors for connecting the power supply modules in series to each other are not provided on the vehicle body. The power supply circuit 310 shown in FIG. 7 includes a plurality of power supply modules 12A, 12B, and a plurality of diodes 14A, 14B connected in parallel to the plurality of power supply modules 12A, 12B, respectively. As in the specific example of the embodiment, the connection points 131A and 132B on both sides of the plurality of power supply modules 12A and 12B connected in series are connected to the connectors 161A and 162B, respectively. The connectors 161A and 162B are detachably connected to the connectors 163A and 164B provided in the vehicle body 331, respectively. Different from the specific example of the embodiment, the connection points 132A and 131B between the power module 12A and the power module 12B are connected to the connectors 362A and 361B. The connector 362A is detachably connected to the connector 361B. The connectors 362A and 361B are not provided in the vehicle body 331. With the above configuration, the plurality of power supply modules 12A and 12B can be individually attached to and detached from the vehicle body 31. ♦ Modification 5 In the specific example of the embodiment, the plurality of power supply modules 12A and 12B included in the power supply circuit 10 can be attached to and detached from the vehicle body 31. However, the power supply circuit of the present invention is not limited to this configuration. In the present invention, only a part of the plurality of power supply modules of the power supply circuit can be attached to and detached from the vehicle body. If the specific example of the embodiment is combined with the modified example, in the present invention, at least one of the plurality of power supply modules included in the power supply circuit can be attached to and detached from the vehicle body. In the present invention, at least one of the plurality of power supply modules included in the power supply circuit cannot be attached to or detached from the vehicle body. For example, the plurality of power supply modules of the power supply circuit may not be detachable from the vehicle body. In this case, the plurality of diodes included in the power supply circuit cannot be attached to or detached from the vehicle body. When the power module cannot be attached to or removed from the vehicle body, a connector may not be used to connect the power module to the load of the vehicle. When the power supply module cannot be attached to or removed from the vehicle body, for example, the wiring connecting the power supply module to the load of the vehicle can be connected by welding or screws. When at least one of the plurality of power supply modules included in the power supply circuit cannot be attached to or detached from the vehicle body, the following effects can be obtained. Compared with the case where the power module is removable, the vibration resistance and impact resistance required of the power module can be reduced. This can not only ensure the versatility of the power module, but also make the power module compact. ♦ Modification 6 In the specific example of the embodiment, the plurality of power supply modules 12A and 12B can be attached to and detached from the vehicle body 31 integrally with the diodes 14A and 14B, respectively. Furthermore, the plurality of power supply modules 12A and 12B can be individually attached to and detached from the vehicle body 31. However, in the present invention, each of at least two power modules among the plurality of power modules in the power supply circuit can be integrally mounted and dismounted with respect to the vehicle body with a diode connected in parallel to the power module. In this case, the configuration is not limited to the above. The at least two power supply modules may be integrally attached to and detached from the vehicle body. For example, all of the plurality of power supply modules included in the power supply circuit can be integrally attached to and detached from the vehicle body. Since at least two power supply modules can be integrally attached to and detached from the vehicle body, the following effects can be obtained. Compared with the case where at least two power supply modules can be individually attached and detached to and from the vehicle body, the number of connection portions for attaching and detaching the power supply module to and from the vehicle body can be reduced. Therefore, attachment and detachment can be performed more easily. FIG. 8 shows an example in which a plurality of power supply modules can be integrally attached to and detached from the vehicle body. The power supply circuit 410 shown in FIG. 8 includes a plurality of power modules 12A, 12B, and a plurality of diodes 14A, 14B connected in parallel with the plurality of power modules 12A, 12B, respectively. As in the specific example of the embodiment, the connection points 131A and 132B on both sides of the plurality of power supply modules 12A and 12B connected in series are connected to the connectors 161A and 162B, respectively. The connectors 161A and 162B are detachably connected to the connectors 163A and 164B provided in the vehicle body 31, respectively. Unlike the specific example of the embodiment, the connection points 132A and 131B between the power module 12A and the power module 12B are not connected to the connector. Therefore, the plurality of power supply modules 12A and 12B can be integrally attached to and detached from the vehicle body 431. ♦ Modification 7 In the specific example of the embodiment, the plurality of power supply modules 12A and 12B can be attached to and detached from the vehicle body 31 integrally with the diodes 14A and 14B, respectively. However, the power supply circuit of the present invention is not limited to this configuration. In the present invention, each of at least one of the plurality of power supply modules of the power supply circuit may be attached to and detached from a vehicle body including a diode connected in parallel with the power supply module. For example, only a part of the plurality of power supply modules can be attached to and detached from a vehicle body including a diode connected in parallel with the power supply module. In this case, at least one of the plurality of diodes included in the power supply circuit cannot be attached to or detached from the vehicle body. In addition, for example, all of the plurality of power supply modules may be attachable to and detachable from a vehicle body including a plurality of diodes. In this case, all of the plurality of diodes included in the power supply circuit cannot be attached to or detached from the vehicle body. When each of at least two power modules of the plurality of power modules can be attached to and detached from a vehicle body including a diode connected in parallel with the power module, the at least two power modules can be individually Attached to the vehicle body. The power module can be attached to and detached from a vehicle body including a diode connected in parallel with the power module, and the following effects can be obtained. In the case of replacing the power module, it can be used directly without replacing the diode. Accordingly, the cost of the diode can be reduced. In addition, since the element to be attached and detached does not include a diode, the element to be attached and detached can be miniaturized. FIG. 9 shows an example in which a plurality of power supply modules can be attached to and detached from a vehicle body including a plurality of diodes. The power supply circuit 510 shown in FIG. 9 includes a plurality of power supply modules 12A, 12B, and a plurality of diodes 14A, 14B connected in parallel to the plurality of power supply modules 12A, 12B, respectively. Between the power supply module 12A and the connection point 131A, a connector 561A and a connector 563A which can be detachably connected are arranged. Between the power supply module 12A and the connection point 132A, a connector 562A and a connector 564A which can be detachably connected are arranged. The connectors 563A and 564A are included in the vehicle body 531. Therefore, the power module 12A can be attached to and detached from the vehicle body 531 including the diode 14A. A connector 561B and a connector 563B are detachably connected between the power module 12B and the connection point 131B. Between the power supply module 12B and the connection point 132B, a connector 562B and a connector 564B which can be detachably connected are arranged. The connectors 563B and 564B are included in the vehicle body 531. Therefore, the power module 12B can be attached to and detached from the vehicle body 531 including the diode 14B. The two power modules 12A and 12B can be attached to and detached from the vehicle body 531 individually. ♦ Modification 8 In the present invention, at least one of the plurality of power sources included in the plurality of power supply modules may be attached to and detached from the vehicle body without being integrated with the switching element. That is, each of at least one of the plurality of power sources may be attached to and detached from a vehicle body including a switching element included in a power source module including the power source and a diode connected in parallel with the power source. For example, all of the plurality of power sources can be attached to and detached from the vehicle body without being integrated with the switching element. For example, only a part of the plurality of power sources may be detachable from the vehicle body without being integrated with the switching element. In this case, the power module including the remaining power source can be attached and detached relative to the vehicle body including the diode. Alternatively, the power module including the remaining power source can be attached to and detached from the vehicle body integrally with the diode. It is also possible that the power supply module including the remaining power supply cannot be detached from the vehicle body. The following effects can be obtained by attaching and detaching the power supply to a vehicle body including a switching element included in the power supply module including the power supply and a diode body connected in parallel with the power supply. In the case of replacing the power supply, it can be used directly without replacing the diode and switching elements. Accordingly, the cost of the diode and the switching element can be reduced. In addition, since the elements to be attached and detached do not include a diode and a switching element, the elements to be attached and detached can be miniaturized. FIG. 10 shows an example in which a plurality of power sources can be attached to and detached from a vehicle body including a plurality of switching elements and a plurality of diodes. The power supply circuit 610 shown in FIG. 10 includes a plurality of power supply modules 12A, 12B, and a plurality of diodes 14A, 14B connected in parallel to the plurality of power supply modules 12A, 12B, respectively. Between the power source 121A and the switching element 122A, a connector 661A and a connector 663A are detachably connected. The switching element 122A is disposed between the connector 663A and the connection point 131A. Between the power source 121A and the connection point 132A, a connector 662A and a connector 664A that can be detachably connected are arranged. The connectors 663A and 664A are included in the vehicle body 631. Therefore, the power source 121A can be attached to and detached from the vehicle body 631 including the switching element 122A and the diode 14A. Further, as shown in FIG. 6, when the switching element 122A is connected to the negative electrode of the power source 121A, the switching element 122A is disposed between the connector 664A and the connection point 132A. A connector 661B and a connector 663B are detachably connected between the power source 121B and the switching element 122B. Between the power source 121B and the connection point 132B, a connector 662B and a connector 664B which can be detachably connected are arranged. The connectors 663B and 664B are included in the vehicle body 631. Therefore, the power source 121B can be attached to and detached from the vehicle body 631 including the switching element 122B and the diode 14B. The two power sources 121A and 121B can be attached to and detached from the vehicle body 631 individually. ♦ Modification 9 In the specific example of the above embodiment, the connectors 161A to 164A and 161B to 164B are used so that the power supply modules 12A and 12B can be attached to and detached from the vehicle body 31. However, in the present invention, when the power module can be attached to or detached from the vehicle body, the connector may not be used. In the present invention, when the power supply module can be attached to and detached from the vehicle body, it is preferable that the power module can be attached and detached without using a tool. ♦ Modification Example 10 In the present invention, the vehicle may be a driver on land, a driver on water, a driver on water, or a driver on air. Vehicles traveling on land are, for example, four-wheel vehicles, two-wheel vehicles, three-wheelers, snowmobiles, and the like. Vehicles traveling on land can also be those with more than four wheels. The four-wheeled vehicle is, for example, a passenger car, an ATV (All Terrain Vehicle), a ROV (Recreational Off-highway Vehicle), a golf cart, a stacker, and the like. The two-wheeled vehicle may be one having two wheels juxtaposed in the front-rear direction or one having two wheels juxtaposed in the left-right direction. Examples of the former include a locomotive (motorcycle), a speed scooter, a light locomotive with a pedal, and a bicycle. The tricycle may be a person having two front wheels or a person having two rear wheels. Vehicles traveling on water are, for example, boats and jet-skis. The vehicle traveling in the water is, for example, a submarine. Vehicles traveling in the air are, for example, airplanes, helicopters, drones, and the like. ♦ Modification 11 The power supply circuit of the present invention may be capable of supplying power not only to a load installed in a vehicle but also to a load installed in a device other than the vehicle. Furthermore, the battery module of Japanese Patent Application No. 2017-024641, which is the basic application of this case, is included in the power module of the description of this case. The battery in the basic application is included in the power source described in this case. The connection terminals 161A to 164A and 161B to 164B in this basic application correspond to the connectors 161A to 164A and 161B to 164B in the description of this case.

1‧‧‧ power supply circuit

10‧‧‧ Power Circuit

12‧‧‧Power Module

12A‧‧‧Power Module

12B‧‧‧Power Module

14‧‧‧diode

14A‧‧‧Diode

14B‧‧‧ Diode

20‧‧‧Load

30‧‧‧ Vehicle

31‧‧‧vehicle body

90‧‧‧ power supply circuit

92A‧‧‧Power Module

92B‧‧‧Power Module

121‧‧‧ Power

121A‧‧‧ Power

121B‧‧‧ Power

122‧‧‧Switch element

122A‧‧‧ Switching element

122B‧‧‧ Switching element

131‧‧‧ connection point (second connection point)

131A‧‧‧ connection point (second connection point)

131B‧‧‧ connection point (second connection point)

132‧‧‧ connection point (1st connection point)

132A‧‧‧connection point (1st connection point)

132B‧‧‧Connection point (1st connection point)

161A‧‧‧Connector

161B‧‧‧Connector

162A‧‧‧Connector

162B‧‧‧Connector

163A‧‧‧Connector

163B‧‧‧Connector

164A‧‧‧Connector

164B‧‧‧Connector

210‧‧‧Power supply circuit

212A‧‧‧Power Module

212B‧‧‧Power Module

310‧‧‧Power supply circuit

331‧‧‧vehicle body

361B‧‧‧Connector

362A‧‧‧Connector

410‧‧‧Power supply circuit

431‧‧‧vehicle body

510‧‧‧Power supply circuit

531‧‧‧vehicle body

561A‧‧‧Connector

561B‧‧‧Connector

562A‧‧‧Connector

562B‧‧‧Connector

563A‧‧‧Connector

563B‧‧‧Connector

564A‧‧‧Connector

564B‧‧‧Connector

610‧‧‧Power supply circuit

631‧‧‧vehicle body

661A‧‧‧Connector

661B‧‧‧Connector

662A‧‧‧Connector

662B‧‧‧Connector

663A‧‧‧Connector

663B‧‧‧Connector

664A‧‧‧Connector

664B‧‧‧Connector

921A‧‧‧Power

921B‧‧‧Power

922A‧‧‧Switching element

922B‧‧‧Switching element

961A‧‧‧Connector

961B‧‧‧Connector

962A‧‧‧Connector

962B‧‧‧Connector

FIG. 1 is a diagram showing a use state of a power supply circuit according to an embodiment of the present invention. FIG. 2 is a diagram showing a use state of a power supply circuit according to a specific example of an embodiment of the present invention. FIG. 3 is a circuit diagram showing a state in which one of the plurality of power supply modules is removed from the vehicle body. FIG. 4 is a circuit diagram of a case where a plurality of switching elements are switched to be turned off in timing. FIG. 5 is a circuit diagram after the diode is removed from FIG. 4. 6 is a circuit diagram showing a use state of a power supply circuit according to a modification example of the embodiment of the present invention. FIG. 7 is a circuit diagram showing a use state of a power supply circuit according to a modification of the embodiment of the present invention. 8 is a circuit diagram showing a use state of a power supply circuit according to a modification example of the embodiment of the present invention. FIG. 9 is a circuit diagram showing a use state of a power supply circuit according to a modification of the embodiment of the present invention. FIG. 10 is a circuit diagram showing a use state of a power supply circuit according to a modification example of the embodiment of the present invention.

Claims (10)

A power supply circuit includes a plurality of power supply modules connected in series and supplying power to a load provided in a vehicle; each of the plurality of power supply modules includes: a power supply for supplying power, and a switch connected in series with the power supply And the power supply circuit includes a plurality of diodes connected in parallel with each of the plurality of power supply modules one by one; each of the plurality of diodes is constituted as follows: the current is allowed to self The first connection point connected to the negative pole of the power source flows to the second connection point to which the diode is connected to the positive pole of the power source, but current is not allowed to flow from the second connection point to the first connection point. The power supply circuit according to claim 1, wherein the switching element is a switching element capable of being electrically controlled. For example, if the power supply circuit of item 1 or 2 is required, at least one of the plurality of power supply modules can be attached to and detached from the vehicle body of the vehicle. For example, the power supply circuit of claim 3, wherein each of the at least one power supply module of the plurality of power supply modules can be integrally attached to and detached from the vehicle body with the diode connected in parallel to the power supply module. For example, the power supply circuit of claim 4, wherein each of the at least two power modules of the plurality of power modules can be integrally mounted with the diodes connected in parallel to the power module relative to the vehicle body; The at least two power modules can be attached to and detached from the vehicle body individually. For example, the power supply circuit of claim 4, wherein each of the at least two power modules of the plurality of power modules can be integrally mounted with the diodes connected in parallel to the power module with respect to the vehicle body; and The at least two power modules can be integrally attached to and detached from the vehicle body. For example, the power supply circuit of claim 3, wherein each of the at least one power supply module of the plurality of power supply modules can be attached to and detached from the vehicle body including the diode connected in parallel with the power supply module. The power supply circuit according to any one of claims 1 to 7, wherein at least one of the plurality of power sources included in the plurality of power supply modules is configured to be attachable and detachable to and from the vehicle body of the vehicle, and the plurality of power sources are provided Each of at least one power source among the plurality of power sources included in the module can be opposed to the vehicle body including the switching element included in the power source module including the power source and the diode connected in parallel with the power source. And loading and unloading. The power supply circuit according to any one of claims 1 to 8, wherein at least one of the plurality of power supply modules cannot be attached to or detached from the vehicle body of the vehicle. The power supply circuit according to any one of claims 1 to 9, wherein the power sources each of the plurality of power supply modules are a power storage device capable of storing power or a power generation device capable of generating power.