CN201143884Y - Electric vehicle conductive on-board charging power supply - Google Patents

Abstract

The utility model relates to a conduction type vehicle charge power supply of an electric bicycle, which includes a chargeable power battery set arranged in the electric bicycle; the power battery set supplies power to the electric bicycle as the output terminal of the power supply. The conduction type vehicle charge power supply of the electric bicycle also includes a charger arranged in the electric bicycle, connected with the utility power grid by a cable and used to charge the power battery set. The conduction type vehicle charge power supply of the electric bicycle of the utility model is arranged in the electric bicycle; the residential utility power grid is used to supply power, and controls the output power below 2kw which the residential utility power can load, so that the power can be conveniently supplemented to the electric bicycle wherever the utility power is supplied.

Description

Electric vehicle conductive on-board charging power supply

technical field

The utility model relates to a rechargeable power supply, in particular to a conductive vehicle-mounted charging power supply for electric vehicles powered by civilian mains.

Background technique

The chargers of the existing electric vehicle power battery packs are usually external, such as charging stations, charging cabinets and the like. The charging station or the charging cabinet can achieve relatively large charging power, but since the charging station and the charging cabinet are fixed facilities dedicated to charging, in the current situation where electric vehicles are not yet popular, if you want to charge the electric vehicle, you must Electric vehicles can only be charged when they drive to a specific charging station, which has considerable limitations and inconvenience.

The traditional solution to the above problems is to build as many electric vehicle charging facilities as possible. However, in the development stage of electric vehicles, various companies in the industry do not have unified charging equipment standards, especially when it comes to the need for data communication when charging, it is even more difficult to standardize electric vehicle charging equipment. Moreover, electric vehicle charging facilities are related to electricity safety. If they are equipped with dedicated personnel, the investment will be huge. Therefore, it is still unrealistic to build large-scale electric vehicle charging facilities at present.

Therefore, there is an urgent need for a new rechargeable power supply for electric vehicles that can solve the above-mentioned problems that occur in the charging of traditional electric vehicle power supplies.

Contents of the invention

The purpose of the utility model is to overcome the defects of the above-mentioned prior art, and provide a conductive vehicle-mounted charging power supply for electric vehicles that can be powered by civilian mains.

Another purpose of the utility model is to provide a conductive on-board charging power supply for electric vehicles with intelligent management.

In order to achieve the above purpose, the technical solution of the utility model is: a conductive on-board charging power supply for electric vehicles, including a rechargeable power battery pack installed in the body of the electric vehicle, and the power battery pack is used as the output end of the power supply for the electric vehicle powered by. The electric vehicle conductive on-board charging power supply also includes a charger installed in the electric vehicle body and connected to the mains grid through cables to charge the power battery pack.

Preferably, the power battery pack is connected to monitor the voltage, current and temperature status of the battery pack in real time and send them to the manager of the body communication network.

Specifically, the charger includes a step-up circuit, a step-down circuit and a control communication circuit. The mains input is boosted by the step-up circuit and then adjusted by the step-down circuit to provide constant voltage and constant current for the power battery pack. The control communication circuit used to start/stop charging or communicate with other modules of the electric vehicle is connected with the boost circuit, the step-down circuit and the manager.

Preferably, the boost circuit adopts an active power factor correction boost circuit.

Preferably, the step-down circuit adopts a pulse width modulation step-down circuit.

Further, the charger also includes a filter protection circuit arranged between the boost circuit and the mains input.

Further, the charger also includes an auxiliary power supply circuit, the alternating current from the filter protection circuit outputs direct current through the auxiliary power supply circuit and is sent to the boost circuit, the step-down circuit and the control communication circuit.

Further, the charger further includes a heat dissipation module, the heat dissipation module is connected to the filter protection circuit and the auxiliary power supply circuit, and the auxiliary power supply circuit supplies DC power or the filter protection circuit supplies AC power.

The electric vehicle conductive on-board charging power supply further includes a wire reel arranged on the electric vehicle body for winding the cable.

The end of the cable connected to the mains power grid has a plug, and the plug is provided with a leakage protector.

The utility model adopts the technical scheme, and its beneficial technical effects are as follows: 1) The electric vehicle conduction type on-board charging power supply of the utility model is installed inside the electric vehicle body, can use the residential mains as the input of electric energy, and output The power is controlled below 2 kilowatts, which is generally able to be loaded by the residential mains electricity, so that the electric vehicle can easily supplement electric energy to the electric vehicle in the place where the mains supply is available; Communication circuit to start/end charging or communicate with other modules of the electric vehicle, and intelligently control the charging process of the vehicle charging power supply; 3) In the electric vehicle conductive vehicle charging power supply of the utility model, the charging output cable , The communication cables have been fixed in the car body, so the output of the charger does not require the user to perform frequent plugging and unplugging operations. Compared with the external charger, it greatly reduces the impact on the life and performance of the connector due to manual plugging and unplugging , and possible security issues due to the unreliability of the connection.

Description of drawings

Fig. 1 is the charging principle diagram of the electric vehicle conduction type on-board charging power supply of the utility model.

Fig. 2 is a charging schematic diagram of the electric vehicle conductive on-board charging power supply of the utility model.

Fig. 3 is a system block diagram of the conductive on-board charging power supply for electric vehicles of the present invention.

Detailed ways

Below through specific embodiment and in conjunction with accompanying drawing, the utility model is further described.

Please refer to FIG. 1 to FIG. 3 , the utility model relates to a conductive on-board charging power supply for an electric vehicle, including a rechargeable power battery pack 30 installed in the body of the electric vehicle 10 , and a power supply installed in the body of the electric vehicle 10 . A charger 20 for charging the battery pack. The power battery pack 30 is used as the output end of the power supply to supply power to the electric vehicle. The charger 20 is connected to the mains input 50 of the mains grid through a cable 40 . The charger 20 includes a filter protection circuit 22 , a voltage boost circuit 24 , and a voltage drop circuit 25 that are connected in series, and also includes an auxiliary power supply circuit 26 , a cooling module 28 and a control communication circuit 29 .

Generally, in order to ensure the power requirements of the electric vehicle 10, a high-voltage battery pack is usually obtained by connecting multiple battery packs in series to reduce the current value of high-power output, and the voltage is usually below 400 volts. Therefore, when considering the charging scheme of the power battery pack, it must be AC to DC. At the same time, because the charging current I=(Uout-UBat)/R (Uout represents the charger output voltage, UBat battery pack voltage, R represents the equivalent resistance) during charging, that is, the difference between the charger output voltage Uout and the battery pack voltage UBat The value is divided by the equivalent resistance R in the charging circuit (including the internal resistance of the battery pack). The voltage of the power battery pack 30 is constantly rising during the charging process, so the voltage output from the charger 20 to the power battery pack 30 must be higher than the voltage of the power battery pack 30 in the end. However, considering the power factor and the need for wide voltage input, it is ideal to use active power factor correction, and a constant voltage value exceeding the maximum voltage of the battery pack can be obtained. Based on this, only one pulse width modulation step-down circuit 25 is needed in the rear stage of the active power factor correction boost circuit 24 to conveniently realize the regulation of the voltage and current of the charger 20 .

The power battery pack 30 is connected to a manager 32 that monitors the voltage, current and temperature of the battery pack in real time and sends them to the body communication network. The power battery pack 30 and the manager 32 can be regarded as the output terminal of the vehicle charger 20 .

The commercial power input 50 is the general power supply part of the charger 20 , which provides energy for the on-board charger 20 so that the on-board charger 20 converts 220V AC mains power into a voltage and current suitable for the power battery pack 30 of the electric vehicle 10 . Due to the fact that a single circuit of residential electricity can generally only load 2 kilowatts of power, and there is no simple and easy method to distinguish the line capacity. Therefore, when the power of the on-board charger 20 is set below 2 kilowatts, convenient charging of the electric vehicle 10 can be realized anytime and anywhere without causing electricity accidents caused by overload.

The mains power input 50 is boosted by the boost circuit 24 and then adjusted by the step-down circuit 25 to supply power for the power battery pack 30 at constant voltage and constant current. The control communication circuit 29 is used to start/stop charging or communicate with other modules of the electric vehicle, and the control communication circuit 29 is connected to the boost circuit 24 , the step-down circuit 25 and the manager 32 .

In the utility model, the boost circuit 24 adopts an active power factor correction boost circuit. The active power factor correction booster circuit 24 converts the 220V AC mains power provided by the mains input 50 into a high voltage direct current (such as 390VDC), and provides a constant voltage source for the PWM step-down circuit 25 . And because the active power factor correction booster circuit 24 has the characteristics of wide voltage input range and power factor correction function, the power factor of the whole machine and the reliability of use are improved. The specific implementation method can be a BOOST circuit controlled by control chips such as IR1150 and UC3854. The main circuit includes an inductance coil, a switch tube, a diode and an output capacitor, and the voltage and current are fed back to the control chip to realize an active power factor correction boost circuit.

In the utility model, the step-down circuit 25 adopts a pulse width modulation step-down circuit 25 . The pulse width modulation step-down circuit 25 adjusts the direct current output by the active power factor correction booster circuit 24 to a voltage and current value suitable for charging the battery pack 30, realizes constant voltage and constant current charging, and ensures safety during charging. There are many specific implementations of the pulse width modulation step-down circuit 25, and the simplest is a non-isolated BUCK circuit realized by a pulse width modulation control chip such as UC3842. The main circuit includes a switch tube, an inductance coil, a diode and The output capacitor has voltage and current feedback to the control chip to realize the pulse width modulation step-down circuit. The primary side of the main circuit includes 4 switching tubes and a drive circuit, an isolation transformer in the middle, and a full-wave rectification and filtering circuit on the secondary side, usually composed of diodes, inductors and capacitors.

The control communication circuit 29 implements software layer protection of the charger 20 and mutual communication with various components of the electric vehicle 10 . The control communication circuit 29 is a unit that controls the entire charging power supply, and can realize the start and end of charging of the charger 20; or the opening and closing of the active power factor correction boost circuit 24 and the pulse width modulation step-down circuit 25; Or be responsible for communicating with other modules (mainly the battery manager 32) of the electric vehicle 10 (such as the CAN bus network used for the car); Charge. The specific implementation mode may adopt a single-chip microcomputer including a communication function.

The charger 20 also includes a filter protection circuit 22 arranged between the boost circuit 24 and the mains input 50 . The filter protection circuit 22 includes a filter circuit and a protection circuit. The filter circuit reduces the interference between the power grid and the vehicle charger 20, and the protection circuit includes a leakage protection function, an anti-overcurrent fuse, and an anti-lightning overvoltage device to ensure the normal operation of the vehicle charger 20 and personnel under abnormal conditions. Safety.

The charger 20 also includes an auxiliary power supply circuit 26 . The auxiliary power supply circuit 26 uses the power provided by the mains input 50 and outputs multiple channels of DC power for use by other circuits. The current from the filter protection circuit 22 is sent to the boost circuit 24 , the voltage drop circuit 25 and the control communication circuit 29 via the auxiliary power supply circuit 26 . The specific implementation of the auxiliary power supply circuit 26 is generally an isolated power supply with a flyback topology, which can output multiple stable voltage sources with different voltage values.

The charger 20 also includes a heat dissipation module 28 . The heat dissipation module 28 is connected to the filter protection circuit 22 and the auxiliary power supply circuit 26 . The auxiliary power supply circuit 26 supplies DC power or the filter protection circuit 22 supplies AC power. The heat dissipating module 28 dissipates heat for the entire rechargeable power supply, which can be air-cooled or water-cooled according to actual conditions.

The electric vehicle conductive on-board charging power supply further includes a reel 44 arranged on the body of the electric vehicle 10 for winding the cable 40 .

The end of the cable 40 connected to the commercial power grid has a plug 42, and the plug 42 is provided with a leakage protector. In this embodiment, the earth leakage protector may be a ground wire provided on the plug 42 .

Although the preferred embodiment of the present invention has been described in detail above, it should be understood that many variations and modifications of the basic inventive concept that are obvious to those skilled in the art fall within the scope of the appended claims. within the spirit and scope of the invention.

Claims (10)

1. A conductive on-board charging power supply for electric vehicles, comprising a rechargeable power battery pack installed in the body of the electric vehicle, the power battery pack is used as the output end of the power supply to supply power to the electric vehicle, and it is characterized in that: it also includes a battery pack installed in the electric vehicle body. The charger in the car body is connected to the mains grid through cables to charge the power battery pack. 2. The conductive on-board charging power supply for electric vehicles according to claim 1, characterized in that: the power battery pack is connected to a manager who monitors the voltage, current and temperature of the battery pack in real time and sends them to the vehicle body communication network. 3. The conductive on-board charging power supply for electric vehicles according to claim 2, characterized in that: the charger includes a boost circuit, a step-down circuit and a control communication circuit, and the mains input is boosted by the boost circuit and then passed through The step-down circuit adjusts the voltage to supply constant voltage and constant current for the power battery pack. The control communication circuit used to start/end charging or communicate with other modules of the electric vehicle is connected to the boost circuit, the step-down circuit and the manager. 4. The conductive on-board charging power supply for electric vehicles according to claim 3, characterized in that: the boost circuit adopts an active power factor correction boost circuit. 5 . The conductive on-board charging power supply for electric vehicles according to claim 3 , wherein the step-down circuit adopts a pulse width modulation step-down circuit. 6 . 6. The electric vehicle conductive on-board charging power supply according to any one of claims 1-5, characterized in that: the charger further includes a filter protection circuit arranged between the boost circuit and the mains input. 7. The electric vehicle conductive on-board charging power supply according to claim 6, characterized in that: the charger also includes an auxiliary power supply circuit, the alternating current from the filter protection circuit outputs direct current through the auxiliary power supply circuit and is sent to the booster circuit , step-down circuit and control communication circuit. 8. The conductive on-board charging power supply for electric vehicles according to claim 7, characterized in that: the charger also includes a heat dissipation module, the heat dissipation module is connected to a filter protection circuit and an auxiliary power supply circuit, and the auxiliary power supply circuit is powered by direct current or AC power supply for filter protection circuit. 9. The conductive on-board charging power supply for electric vehicles according to claim 6, characterized in that: the conductive on-board charging power supply for electric vehicles further includes a wire for winding the cable arranged on the body of the electric vehicle plate. 10. The conductive on-board charging power supply for electric vehicles according to claim 9, characterized in that: the end of the cable connected to the mains power grid has a plug, and the plug is provided with a leakage protector.

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