TWI643445B - Power supply apparatus - Google Patents

Abstract

A power supply device includes a first rectifier switch circuit and a second rectifier switch circuit. The first rectifier switch circuit is coupled between the live and neutral terminals of the first AC power source and the first and second contacts. The second rectifier switch circuit is coupled between the live and neutral terminals of the second AC power source and the first and second contacts. When the state of the first AC power source is normal, the first rectifying switch circuit rectifies the first AC power source to provide rectified power at the first contact and the second contact. When the state of the first AC power source is abnormal, the second rectifying switch circuit rectifies the second AC power source to provide rectified power at the first contact and the second contact.

Description

Power supply device

The present invention relates to a power supply technology, and more particularly, to a power supply device with an automatic power switching function.

To ensure the stable operation of the electronic system, a power supply device with dual input power is usually used to power the system. A power supply device with dual input power usually has an automatic transfer switch (ATS) function. When the main input power is abnormal, it can automatically switch to use the backup input power to power the system to avoid possible electronic system failure. The problem of data loss and damage occurs when the power supply is interrupted, thereby improving the reliability of the electronic system.

Because the current power supply device with dual input power supply has the function of an automatic switch, its circuit design is more complicated and the hardware cost is higher. Therefore, how to reduce the circuit complexity and hardware cost of a power supply device with dual input power is one of the major issues that those skilled in the art want to solve.

In view of this, the present invention provides a power supply device, which not only has the function of an automatic transfer switch, but also has lower circuit complexity and hardware cost.

The power supply device of the present invention includes a first rectifier switch circuit and a second rectifier switch circuit. The first rectifier switch circuit is coupled to a first AC power source. The first rectifier switch circuit includes a first solid state switch, a second solid state switch, a third solid state switch, and a fourth solid state switch. The first terminal of the first solid-state switch is coupled to the live terminal of the first AC power source. The second terminal of the first solid-state switch is coupled to the first contact. The first terminal of the second solid-state switch is coupled to the second contact. The second terminal of the second solid-state switch is coupled to the live terminal of the first AC power source. The first terminal of the third solid-state switch is coupled to the neutral terminal of the first AC power source. The second terminal of the third solid-state switch is coupled to the first contact. The first terminal of the fourth solid-state switch is coupled to the second contact. The second terminal of the fourth solid-state switch is coupled to the neutral terminal of the first AC power source. The second rectifier switch circuit is coupled to a second AC power source. The second rectifier switch circuit includes a fifth solid state switch, a sixth solid state switch, a seventh solid state switch, and an eighth solid state switch. The first terminal of the fifth solid state switch is coupled to the live terminal of the second AC power source. The second terminal of the fifth solid-state switch is coupled to the first contact. The first terminal of the sixth solid-state switch is coupled to the second contact. The second terminal of the sixth solid-state switch is coupled to the live terminal of the second AC power source. The first terminal of the seventh solid-state switch is coupled to the neutral terminal of the second AC power source. The second terminal of the seventh solid-state switch is coupled to the first contact. The first terminal of the eighth solid-state switch is coupled to the second contact. The second terminal of the eighth solid-state switch is coupled to the neutral terminal of the second AC power source. When the state of the first AC power source is normal, the first solid state switch to the fourth solid state switch respond to the first control signal to rectify the first AC power source, thereby providing rectified power at the first contact and the second contact. . When the state of the first AC power source is abnormal, the fifth solid state switch to the eighth solid state switch respond to the second control signal to rectify the second AC power source, thereby providing the rectified power at the first contact and the second contact. .

Based on the above, in the power supply device proposed by the present invention, the first rectifier switch circuit and the second rectifier switch circuit can be substantially regarded as automatic transfer switches with a rectification function. Therefore, compared with a power supply device designed by using an independent automatic transfer switch and an independent rectifier circuit, the power supply device of the present invention has lower circuit complexity and hardware cost.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

In order to make the content of the present invention easier to understand, the following specific embodiments are given as examples by which the present invention can be implemented. In addition, wherever possible, the same reference numbers are used in the drawings and embodiments to refer to the same or similar components.

Please refer to FIG. 1 below. FIG. 1 is a schematic circuit diagram of a power supply device 100 according to an embodiment of the present invention. As shown in FIG. 1, the power supply device 100 may include a first rectifier switch circuit 110, a second rectifier switch circuit 120, and a power conversion circuit 130, but the present invention is not limited thereto. In other embodiments of the present invention, the power conversion circuit 130 may also be disposed outside the power supply device 100 to become an independent power conversion device, and its end depends on actual applications or design requirements.

The first rectifier switch circuit 110 is coupled to the first AC power source PA1, and the second rectifier switch circuit 120 is coupled to the second AC power source PA2. One of the first AC power supply PA1 and the second AC power supply PA2 may be designated as a main power supply, and the other one may be designated as a backup power supply. However, for the convenience of the following description, the following is to designate the first AC power source PA1 as the main power supply of the power supply device 100, and designate the second AC power source PA2 to be abnormal when the first AC power source PA1 (such as power failure or voltage is lower than a specific value). ) Is described as an exemplary embodiment of a backup power supply for the power supply device 100. As for the embodiment in which the second AC power source PA2 is used as the main power supply for the power supply device 100, and the first AC power source PA1 is used as the backup power supply in the power supply device 100, it can be deduced by analogy.

The first rectifier switch circuit 110 may include a first solid state switch SS1, a second solid state switch SS2, a third solid state switch SS3, and a fourth solid state switch SS4. The first terminal of the first solid state switch SS1 is coupled to the live terminal L1 of the first AC power source PA1. The second terminal of the first solid-state switch SS1 is coupled to the first contact P1. A first terminal of the second solid-state switch SS2 is coupled to the second contact P2. The second terminal of the second solid state switch SS2 is coupled to the first terminal of the first solid state switch SS1, and is coupled to the live terminal L1 of the first AC power source PA1. The first terminal of the third solid-state switch SS3 is coupled to the neutral terminal N1 of the first AC power source PA1. The second terminal of the third solid-state switch SS3 is coupled to the first contact P1. A first terminal of the fourth solid-state switch SS4 is coupled to the second contact P2. The second terminal of the fourth solid state switch SS4 is coupled to the first terminal of the third solid state switch SS3, and is coupled to the neutral terminal N1 of the first AC power source PA1.

The second rectifier switch circuit 120 includes a fifth solid-state switch SS5, a sixth solid-state switch SS6, a seventh solid-state switch SS7, and an eighth solid-state switch SS8. The first terminal of the fifth solid state switch SS5 is coupled to the live terminal L2 of the second AC power source PA2. The second terminal of the fifth solid-state switch SS5 is coupled to the first contact P1. A first terminal of the sixth solid-state switch SS6 is coupled to the second contact P2. The second terminal of the sixth solid-state switch SS6 is coupled to the first terminal of the fifth solid-state switch SS5, and is coupled to the live terminal L2 of the second AC power source PA2. The first terminal of the seventh solid-state switch SS7 is coupled to the neutral terminal N2 of the second AC power source PA2. The second terminal of the seventh solid-state switch SS7 is coupled to the first contact P1. The first terminal of the eighth solid-state switch SS8 is coupled to the second contact P2. The second terminal of the eighth solid state switch SS8 is coupled to the first terminal of the seventh solid state switch SS7, and is coupled to the neutral terminal N2 of the second AC power source PA2.

The power conversion circuit 130 is coupled to the first contact P1 and the second contact P2 to receive the rectified power, and converts the rectified power to generate a DC power PDC. In an embodiment of the present invention, the power conversion circuit 130 may be various types of DC to DC converters, which may include, for example, a power factor correction circuit, a large capacitor, and a step-up or step-down circuit, but the present invention is not limited thereto. .

In particular, the first solid state switch SS1 to the fourth solid state switch SS4 are responsive to the first control signal SC1 to rectify the first AC power source PA1 when the state of the first AC power source PA1 is normal, so that at the first contact P1 Provide rectified power with the second contact P2. The fifth solid state switch SS5 to the eighth solid state switch SS8 respond to the second control signal SC2 to rectify the second AC power source PA2 when the state of the first AC power source PA1 is abnormal, so that the first contact P1 and the first Two contacts P2 provide rectified power.

Furthermore, when the state of the first AC power source PA1 is normal, the fifth solid state switch SS5 to the eighth solid state switch SS8 can be disabled through the second control signal SC2 and caused by the first control signal SC1. The first solid state switch SS1 to the fourth solid state switch SS4 can be enabled, so that the first solid state switch SS1 to the fourth solid state switch SS4 rectify the first AC power source PA1 so that the first contact P1 and the second contact P2 Provide rectified power. Therefore, during the positive half cycle of the first AC power source PA1, the live line terminal L1, the first solid state switch SS1, the power conversion circuit 130, the fourth solid state switch SS4, and the neutral line terminal of the first AC power source PA1 during the first AC power source PA1. N1 will form a current path; and during the negative half cycle of the first AC power source PA1, the neutral terminal N1, the third solid-state switch SS3, the power conversion circuit 130, the second solid-state switch SS2, and the first The live terminal L1 of the AC power source PA1 will form another current path.

In contrast, when the state of the first AC power source PA1 is abnormal and the state of the second AC power source PA2 is normal, the first solid state switch SS1 to the fourth solid state switch SS4 can be disabled through the first control signal SC1, and through the first The two control signals SC2 enable the fifth solid state switch SS5 to the eighth solid state switch SS8, so that the first solid state switch SS1 to the fourth solid state switch SS4 stop rectifying the first AC power source PA1, and the fifth solid state switch SS5 to the eighth The solid state switch SS8 rectifies the second AC power source PA2 to provide an alternative rectified power source at the first contact point P1 and the second contact point P2. Therefore, during the positive half cycle of the second AC power source PA2, the live line terminal L2 of the second AC power source PA2, the fifth solid state switch SS5, the power conversion circuit 130, the eighth solid state switch SS8, and the neutral line end of the second AC power source PA2. N2 will form a current path; during the negative half cycle of the second AC power source PA2, the neutral terminal N2 of the second AC power source PA2, the seventh solid-state switch SS7, the power conversion circuit 130, the sixth solid-state switch SS6, and the second The live terminal L2 of the AC power source PA2 will form another current path.

In addition, after the state of the first AC power source PA1 returns from abnormal to normal, the fifth solid state switch SS5 to the eighth solid state switch SS8 can be disabled through the second control signal SC2 and caused by the first control signal SC1. The first solid state switch SS1 to the fourth solid state switch SS4 can be enabled, so that the first solid state switch SS1 to the fourth solid state switch SS4 rectify the first AC power source PA1 so that the first contact P1 and the second contact P2 Provide rectified power.

It can be understood that the first rectifying switch circuit 110 and the second rectifying switch circuit 120 can be substantially regarded as automatic transfer switches having a rectifying function. Therefore, compared with a power supply device designed using an independent automatic transfer switch and an independent rectifier circuit, the power supply device 100 of this embodiment has a lower circuit complexity. In addition, when the power supply device 100 is activated and starts to receive the first AC power supply PA1, the first solid state switch SS1 to the fourth solid state switch SS4 can be controlled by the first control signal SC1. To enable the first solid-state switch SS1 to the fourth solid-state switch SS4 when the voltage of the first AC power source PA1 reaches a specific value, thereby suppressing the inrush current of the power conversion circuit 130. As a result, the power conversion The circuit 130 (or the power supply device 100) can omit the current limiter, thereby reducing the overall hardware cost of the power supply device 100.

In an embodiment of the present invention, each of the first solid state switch SS1 to the eighth solid state switch SS8 may be a silicon control rectifier (SCR), but the present invention is not limited thereto, and the first solid state switch The first terminal of each of SS1 to eighth solid state switch SS8 may be, for example, an anode terminal of a silicon controlled rectifier, and the second terminal of each of first to eighth solid state switches SS1 to SS8, SS8 may be, for example, silicon Control the cathode terminal of the rectifier, the control terminal of each of the first solid state switch SS1 to the fourth solid state switch SS4 receives the first control signal SC1, and the fifth solid state switch SS5 to the eighth solid state switch SS8 The control terminal receives the second control signal SC2.

In an embodiment of the present invention, a filter capacitor Cf may also be connected in series between the first contact P1 and the second contact P2 to filter high-frequency noise in the rectified power supply, but the present invention does not use this. Limited.

In an embodiment of the present invention, an electromagnetic interference filter (EMI filter) may be provided between the first rectifying switch circuit 110 and the first AC power source PA1 of the power supply device 100 to filter / suppress the first AC power source PA1. Electromagnetic interference signals. Similarly, an electromagnetic interference filter (EMI filter) may be provided between the second rectifier switch circuit 120 of the power supply device 100 and the second AC power source PA2 to filter / suppress electromagnetic interference signals in the second AC power source PA2. However, the present invention is not limited to this.

Please refer to FIG. 2 below. FIG. 2 is a schematic circuit diagram of a power supply device 200 according to another embodiment of the present invention. As shown in FIG. 2, the power supply device 200 may include a first rectifier switch circuit 110, a second rectifier switch circuit 120, a power conversion circuit 130, a first transmission switch circuit 250, a second transmission switch circuit 260, a detection circuit 270, and The control circuit 280 is not limited thereto. The implementation and operation of the first rectification switch circuit 110, the second rectification switch circuit 120, and the power conversion circuit 130 of the power supply device 200 are similar to the first rectification switch circuit 110 and the second rectification switch of the power supply device 100 of FIG. 1, respectively. The circuit 120 and the power conversion circuit 130 can refer to the related description in FIG. 1 described above, and will not be repeated here.

The first transmission switch circuit 250 is coupled between the first AC power source PA1 and the first rectifier switch circuit 110. The first transmission switch circuit 250 is controlled by the first switch signal SR1 to turn on or off the current path between the first AC power source PA1 and the first rectifier switch circuit 110. The second transmission switch circuit 260 is coupled between the second AC power source PA2 and the second rectifier switch circuit 120. The second transmission switch circuit 260 is controlled by the second switch signal SR2 to turn on or off the current path between the second AC power source PA2 and the second rectifier switch circuit 120.

In an embodiment of the present invention, the first transmission switch circuit 250 may include a first relay 251 and a second relay 252. The first relay 251 is coupled between the live terminal L1 of the first AC power source PA1 and the first terminal of the first solid-state switch SS1, and is controlled by the first switching signal SR1. The second relay 252 is coupled between the neutral terminal N1 of the first AC power source PA1 and the first terminal of the third solid state switch SS3, and is controlled by the first switching signal SR1. Similarly, the second transmission switch circuit 260 may include a third relay 263 and a fourth relay 264. The third relay 263 is coupled between the live terminal L2 of the second AC power source PA2 and the first terminal of the fifth solid state switch SS5, and is controlled by the second switching signal SR2. The fourth relay 264 is coupled between the neutral terminal N2 of the second AC power source PA2 and the first terminal of the seventh solid-state switch SS7, and is controlled by the second switching signal SR2.

In an embodiment of the present invention, each of the first relay 251, the second relay 252, the third relay 263, and the fourth relay 264 may be, for example, an electromagnetic relay (EMR). Not limited to this.

The detection circuit 270 is coupled to the first AC power source PA1 and the second AC power source PA2, and is configured to detect states (such as voltage and current) of the first AC power source PA1 and the second AC power source PA2 to obtain a detection signal DS. In an embodiment of the present invention, the detection circuit 270 may be, for example, a voltage sensor or a current sensor, but the present invention is not limited thereto.

The control circuit 280 is coupled to the detection circuit 270, the first rectifier switch circuit 110, the second rectifier switch circuit 120, the first transmission switch circuit 250, and the second transmission switch circuit 260. The control circuit 280 can generate a first control signal SC1, a second control signal SC2, a first switch signal SR1, and a second switch signal SR2 according to the received detection signal DS.

In an embodiment of the present invention, the control circuit 280 may be hardware, firmware, or stored in a memory and loaded and executed by a microprocessor (Microprocessor) or a digital signal processor (DSP). Software or machine-executable code. If it is implemented by hardware, the control circuit 280 may be achieved by a single integrated circuit chip, or may be completed by multiple circuit chips, but the present invention is not limited thereto. The above-mentioned multiple circuit chips or a single integrated circuit chip may use an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), or a Field Programmable Gate Array. FPGA). The memory may be, for example, a random access memory, a read-only memory, or a flash memory.

Hereinafter, please refer to FIG. 2 and FIG. 3 together. FIG. 3 is a schematic diagram of the operation sequence of the power supply device 200 of FIG. 2 according to an embodiment of the present invention. It must be stated here that this embodiment uses the first control signal SC1, the second control signal SC2, the first switch signal SR1, and the second switch signal SR2 as logic high levels to indicate the enabled state, and uses the first A control signal SC1, a second control signal SC2, a first switch signal SR1 and a second switch signal SR2 are logic low levels to indicate a disabled state. That is, the first solid state switch SS1 to the fourth solid state switch SS4 (the fifth solid state switch SS5 to the eighth solid state switch SS8) are enabled in response to the first control signal SC1 (second control signal SC2) of a logic high level. The first solid state switch SS1 to the fourth solid state switch SS4 (the fifth solid state switch SS5 to the eighth solid state switch SS8) are disabled in response to the first control signal SC1 (second control signal SC2) at a logic low level. Similarly, the first relay 251 and the second relay 252 (the third relay 263 and the fourth relay 264) are turned on in response to the first switching signal SR1 (the second switching signal SR2) at a logic high level, and the first relay 251 and the second relay 252 (the third relay 263 and the fourth relay 264) are turned off in response to the first switching signal SR1 (the second switching signal SR2) at a logic low level. However, the present invention is not limited to this. Those skilled in the art should understand that the logic level of the first control signal SC1 (the second control signal SC2) and the first solid state switch SS1 to the fourth solid state switch SS4 (the fifth solid state switch SS5 to the eighth solid state switch) SS8) The relationship between enabling or not can be defined by the designer according to actual needs. Similarly, the logic level of the first switch signal SR1 (second switch signal SR2) and the first relay 251 and the second The relationship between the conduction of the relay 252 (the third relay 263 and the fourth relay 264) can be defined by the designer according to actual needs.

First, in the time interval TP1 shown in FIG. 3, the control circuit 280 determines that the state of the first AC power source PA1 is normal (for example, the voltage VA1 of the first AC power source PA1 is normal) according to the detection signal DS. Therefore, the control circuit 280 will Turn on the first transmission switch circuit 250 (switched to a logic high level due to the first switching signal SR1), enable the first rectifier switch circuit 110 (switched to a logic high level due to the first control signal SC1), and disable the second rectification The switching circuit 120 (because the second control signal SC2 is at a logic low level), the first solid-state switch SS1 to the fourth solid-state switch SS4 in the first rectifying switch circuit 110 rectify the first AC power source PA1 and provide rectification. Power is supplied to the power conversion circuit 130. In other words, at this time, the power is converted from the first AC power source PA1 to the power conversion circuit 130.

It is worth mentioning that because the time required for the electromagnetic relay to switch from the off state to the stable on state is longer than that of the silicon controlled rectifier, in the time interval TP1 shown in FIG. 3, if the control circuit 280 The signal DS is judged to determine that the state of the second AC power source PA2 is normal (for example, the voltage VA2 of the second AC power source PA2 is normal), the control circuit 280 may turn on the first state when the second rectifier switch circuit 120 is disabled. The third relay 263 and the fourth relay 264 in the two transmission switch circuit 260 (ie, the second switch signal SR2 is switched to a logic high level). In this way, when the first AC power source PA1 is abnormal, the speed at which the power source of the power supply device 200 is switched from the first AC power source PA1 to the second AC power source PA2 can be accelerated.

Next, in the time interval TP2 shown in FIG. 3, the second AC power source PA2 is normal, but the first AC power source PA1 is abnormal (for example, the voltage VA1 of the first AC power source PA1 is in a brown-out state) and cannot be used. Normal power supply. At this time, the control circuit 280 can determine that the state of the first AC power source PA1 is abnormal and the state of the second AC power source PA2 is normal according to the detection signal DS. Therefore, the control circuit 280 will sequentially disable the first rectifier switch circuit. 110 (the first control signal SC1 switches to a logic low level), turns off the first transmission switch circuit 250 (the first switch signal SR1 switches to a logic low level), and enables the second rectifier switch circuit 120 (the second control signal SC2 switches to logic high level). Since the third relay 263 and the fourth relay 264 in the second transmission switch circuit 260 have been previously turned on in the time interval TP1, the fifth solid state switch SS5 to the eighth solid state switch SS8 can rectify the second AC power source PA2, and The rectified power is supplied to the power conversion circuit 130. At this time, the first rectifying switch circuit 110 stops rectifying the first AC power source PA1. In other words, at this time, the first AC power source PA1 stops supplying power to the power conversion circuit 130, and the second AC power source PA2 supplies power to the power conversion circuit 130.

After that, in the time interval TP3 shown in FIG. 3, the first AC power source PA1 returns from abnormal to normal. Therefore, after the control circuit 280 determines that the first AC power source PA1 has changed from abnormal to normal according to the detection signal DS, the control circuit 280 sequentially turns on the first transmission switch circuit 250 (the first switch signal SR1 switches to a logic high level) ), Disable the second rectifier switch circuit 120 (the second control signal SC2 switches to a logic low level), turn off the second transmission switch circuit 260 (the second switch signal SR2 switches to a logic low level), and enable the first The rectifier switch circuit 110 (the first control signal SC1 is switched to a logic high level) causes the second rectifier switch circuit 120 to stop rectifying the second AC power source PA2, and the first solid state switches SS1 to SS1 of the first rectifier switch circuit 110 The fourth solid state switch SS4 rectifies the first AC power source PA1 and supplies the rectified power source to the power conversion circuit 130. In other words, at this time, the second AC power source PA2 stops supplying power to the power conversion circuit 130, and the first AC power source PA1 supplies power to the power conversion circuit 130.

In addition, in the time interval TP3 shown in FIG. 3, the control circuit 280 can further turn on the second transmission switch circuit 260 after turning off the second transmission switch circuit 260 for a predetermined time period, so as to switch on the second rectification switch circuit 120. In the disabled state, the third relay 263 and the fourth relay 264 in the second transmission switch circuit 260 are turned on in advance (that is, the second switch signal SR2 is switched to a logic high level). In this way, when the first AC power source PA1 is abnormal next time, the speed at which the power source of the power supply device 200 is switched from the first AC power source PA1 to the second AC power source PA2 can be accelerated.

In summary, in the power supply device according to the embodiment of the present invention, the first rectifier switch circuit and the second rectifier switch circuit can be regarded as an automatic transfer switch having a rectification function. Therefore, compared with a power supply device designed using an independent automatic transfer switch and an independent rectifier circuit, the power supply device of this embodiment has a lower circuit complexity. In addition, when the power supply device is activated and starts to receive the first AC power, the first rectifier switch circuit can be enabled when the voltage of the first AC power reaches a specific value, thereby suppressing the surge of the power conversion circuit. Current. In this way, the power supply device can omit the current limiting circuit and reduce the overall hardware cost of the power supply device.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

100, 200‧‧‧ power supply device

110‧‧‧The first rectifier switch circuit

120‧‧‧Second Rectifier Switch Circuit

130‧‧‧Power Conversion Circuit

250‧‧‧The first transmission switch circuit

251‧‧‧First Relay

252‧‧‧Second Relay

260‧‧‧Second transmission switch circuit

263‧‧‧Third Relay

264‧‧‧Fourth Relay

270‧‧‧detection circuit

280‧‧‧Control circuit

Cf‧‧‧filter capacitor

DS‧‧‧ detection signal

L1, L2‧‧‧‧Wire terminal

N1, N2‧‧‧ neutral terminal

P1‧‧‧First contact

P2‧‧‧Second Contact

PA1‧‧‧First AC power supply

PA2‧‧‧Second AC Power Supply

PDC‧‧‧DC Power Supply

SC1‧‧‧first control signal

SC2‧‧‧Second control signal

SR1‧‧‧First switch signal

SR2‧‧‧Second switch signal

SS1‧‧‧The first solid state switch

SS2‧‧‧Second Solid State Switch

SS3‧‧‧The third solid state switch

SS4‧‧‧Fourth solid state switch

SS5‧‧‧Fifth solid state switch

SS6‧‧‧Sixth solid state switch

SS7‧‧‧Seventh solid state switch

SS8‧‧‧eighth solid state switch

TP1, TP2, TP3 ‧‧‧ time interval

VA1, VA2‧‧‧ Voltage

The following drawings are a part of the specification of the present invention and illustrate exemplary embodiments of the present invention. The drawings and the description of the specification together illustrate the principle of the present invention. FIG. 1 is a schematic circuit diagram of a power supply device according to an embodiment of the present invention. FIG. 2 is a schematic circuit diagram of a power supply device according to another embodiment of the present invention. FIG. 3 is a schematic diagram illustrating an operation sequence of the power supply device of FIG. 2 according to an embodiment of the present invention.

Claims (10)

A power supply device includes a first rectifier switch circuit coupled to a first AC power source. The first rectifier switch circuit includes a first solid state switch, a second solid state switch, a third solid state switch, and a fourth A solid state switch, wherein a first terminal of the first solid state switch is coupled to a live wire terminal of the first AC power source, a second terminal of the first solid state switch is coupled to a first contact, and a first terminal of the second solid state switch Terminal is coupled to a second contact, the second terminal of the second solid state switch is coupled to the live wire terminal of the first AC power source, and the first terminal of the third solid state switch is coupled to a neutral wire of the first AC power source Terminal, the second terminal of the third solid state switch is coupled to the first contact, the first terminal of the fourth solid state switch is coupled to the second contact, and the second terminal of the fourth solid state switch is coupled to the first contact The neutral terminal of an AC power source; a second rectifier switch circuit coupled to a second AC power source, the second rectifier switch circuit including a fifth solid state switch, a sixth solid state switch, a seventh solid state switch, and a An eighth solid state switch, wherein the first of the fifth solid state switches A hot wire terminal coupled to the second AC power source, a second terminal of the fifth solid state switch coupled to the first contact, a first terminal of the sixth solid state switch coupled to the second contact, and the sixth solid state switch The second terminal of the switch is coupled to the hot wire terminal of the second AC power source; the first terminal of the seventh solid state switch is coupled to a neutral wire terminal of the second AC power source, and the second terminal of the seventh solid state switch is coupled The first contact, the first terminal of the eighth solid-state switch is coupled to the second contact, and the second terminal of the eighth solid-state switch is coupled to the neutral terminal of the second AC power source. When the state of the AC power is normal, the first solid-state switch to the fourth solid-state switch respond to a first control signal to rectify the first AC power, so that the first contact and the second contact are provided. A rectified power source, and when the state of the first AC power source is abnormal, the fifth solid state switch to the eighth solid state switch respond to a second control signal to rectify the second AC power source, so that in the first A contact and the second contact provide the rectified power; and a power Converter circuit coupled to the first contact and the second contact to the power supply after receiving the rectified and the rectified power supply to generate a DC power converter. The power supply device according to item 1 of the patent application scope, wherein each of the first solid state switch to the eighth solid state switch is a silicon controlled rectifier, and the first solid state switch to the eighth solid state switch are The first terminal of each is the anode terminal of the silicon controlled rectifier, and the second terminal of each of the first solid state switch to the eighth solid state switch is the cathode terminal of the silicon controlled rectifier. The power supply device according to item 1 of the scope of patent application, further comprising: a first transmission switch circuit coupled between the first AC power source and the first rectifier switch circuit to be controlled by a first A switch signal to turn on or off the current path between the first AC power source and the first rectifier switch circuit; and a second transmission switch circuit coupled between the second AC power source and the second rectifier switch circuit Is used to turn on or off the current path between the second AC power source and the second rectifier switch circuit by being controlled by a second switching signal. The power supply device according to item 3 of the scope of patent application, wherein the first transmission switch circuit includes: a first relay coupled to the live wire terminal of the first AC power supply and the first solid state switch. Between the terminals and controlled by the first switching signal; and a second relay coupled between the neutral terminal of the first AC power supply and the first terminal of the third solid state switch and controlled Based on the first switching signal, the second transmission switching circuit includes: a third relay, coupled between the live terminal of the second AC power source and the first terminal of the fifth solid state switch, and controlled A second switching signal; and a fourth relay, coupled between the neutral terminal of the second AC power source and the first terminal of the seventh solid-state switch, and controlled by the second switching signal. According to the third aspect of the patent application scope, the power supply device further includes a detection circuit coupled to the first AC power source and the second AC power source to detect the state of the first AC power source and the first AC power source. Two AC power sources to obtain a detection signal; and a control circuit coupled to the detection circuit, the first rectifier switch circuit, the second rectifier switch circuit, the first transmission switch circuit, and the second transmission switch A circuit for generating the first control signal, the second control signal, the first switch signal and the second switch signal according to the detection signal. The power supply device according to item 5 of the scope of patent application, wherein: when the control circuit determines that the state of the first AC power supply is normal according to the detection signal, the control circuit turns on the first transmission switch circuit to cause Enabling the first rectifier switch circuit and disabling the second rectifier switch circuit, causing the first solid-state switch to the fourth solid-state switch to rectify the first AC power to provide the rectified power; and when the control circuit is based on When the detection signal determines that the state of the second AC power supply is normal, the control circuit turns on the second transmission switch circuit. The power supply device according to item 6 of the scope of patent application, wherein when the control circuit determines that the state of the first AC power source is abnormal and the state of the second AC power source is normal according to the detection signal, the control The circuit disables the first rectifier switch circuit, turns off the first transmission switch circuit, enables the second rectifier switch circuit, and maintains the second transmission switch circuit in a conducting state, causing the fifth solid state switch to the eighth The solid state switch rectifies the second AC power to provide the rectified power. The power supply device according to item 7 of the scope of patent application, wherein after the control circuit judges that the state of the first AC power source has changed from abnormal to normal according to the detection signal, the control circuit sequentially turns on the first A transmission switch circuit, disabling the second rectification switch circuit, turning off the second transmission switch circuit, and enabling the first rectification switch circuit, so that the first solid state switch to the fourth solid state switch perform the first AC power supply Rectified to provide the rectified power. The power supply device according to item 8 of the scope of patent application, wherein after the control circuit judges that the state of the first AC power source changes from abnormal to normal according to the detection signal, the control circuit further turns off the first power supply. After the two transmission switch circuits reach a preset time length, the second transmission switch circuit is turned on. The power supply device according to item 1 of the patent application scope, wherein the power conversion circuit does not have a current limiting circuit.