On-board charging and discharging apparatus, charging and discharging system thereof, and electric vehicle

1. An on-board charging apparatus, comprising:

an alternating current to direct current conversion circuit (AC/DC conversion circuit);

a power factor correction (PFC) circuit; and

a direct current to direct current conversion circuit (DC/DC conversion circuit),

wherein an alternating current terminal of the AC/DC conversion circuit is connected to an alternating current terminal of the PFC circuit, a direct current terminal of the AC/DC conversion circuit is connected to a first direct current terminal of the DC/DC conversion circuit, and a direct current terminal of the PFC circuit is connected to a second direct current terminal of the DC/DC conversion circuit;

wherein the AC/DC conversion circuit is configured to: receive a first alternating current voltage at the alternating current terminal of the AC/DC conversion circuit, and convert a first component of the first alternating current voltage into a first direct current voltage;

wherein the PFC circuit is configured to: convert a second component of the first alternating current voltage into a second direct current voltage; and

wherein the DC/DC conversion circuit is configured to: convert the first direct current voltage and the second direct current voltage into a third direct current voltage, and output the third direct current voltage to a to-be-charged device.

2. The on-board charging apparatus according to claim 1 ,

wherein the PFC circuit comprises a boost circuit and a first bus bar;

wherein an input terminal of the boost circuit is the alternating current terminal of the PFC circuit, a first output terminal of the boost circuit is connected to a positive terminal of the first bus bar, a second output terminal is connected to a negative terminal of the first bus bar, the positive terminal of the first bus bar is connected to a first endpoint of the second direct current terminal of the DC/DC conversion circuit, and the negative terminal of the first bus bar is connected to a second endpoint of the second direct current terminal of the DC/DC conversion circuit;

wherein the boost circuit is configured to: convert the second component of the first alternating current voltage into the second direct current voltage; and

wherein the first bus bar is configured to: receive the second direct current voltage, and transmit the second direct current voltage to the DC/DC conversion circuit.

3. The on-board charging apparatus according to claim 2 ,

wherein the boost circuit comprises an energy storage inductor, a first diode, a first switching transistor, and a second switching transistor; and

wherein a first terminal of the energy storage inductor is connected to the alternating current terminal of the AC/DC conversion circuit, the first diode is cross-connected between the alternating current terminal of the AC/DC conversion circuit and the positive terminal of the first bus bar, a cathode of the first diode is connected to the positive terminal of the first bus bar, the first switching transistor is cross-connected between a second terminal of the energy storage inductor and the positive terminal of the first bus bar, and the second switching transistor is cross-connected between the second terminal of the energy storage inductor and the negative terminal of the first bus bar.

4. The on-board charging apparatus according to claim 1 ,

wherein the AC/DC conversion circuit comprises a conversion sub-circuit and a second bus bar, an input terminal of the conversion sub-circuit is the alternating current terminal of the AC/DC conversion circuit, a first output terminal of the conversion sub-circuit is connected to a positive terminal of the second bus bar, a second output terminal is connected to a negative terminal of the second bus bar, the positive terminal of the second bus bar is connected to a first endpoint of the first direct current terminal of the DC/DC conversion circuit, and the negative terminal of the second bus bar is connected to a second endpoint of the first direct current terminal of the DC/DC conversion circuit;

wherein the conversion sub-circuit is configured to: convert the first component of the first alternating current voltage into the first direct current voltage; and

wherein the second bus bar is configured to: receive the first direct current voltage, and transmit the first direct current voltage to the DC/DC conversion circuit.

5. The on-board charging apparatus according to claim 4 , wherein the conversion sub-circuit comprises a first H-bridge rectifier circuit configured to convert the first component of the first alternating current voltage into the first direct current voltage.

6. The on-board charging apparatus according to claim 5 ,

wherein the first H-bridge rectifier circuit comprises a third switching transistor, a fourth switching transistor, a second diode, and a third diode; and

wherein the third switching transistor is cross-connected between the alternating current terminal of the AC/DC conversion circuit and the positive terminal of the second bus bar, the fourth switching transistor is cross-connected between the alternating current terminal of the AC/DC conversion circuit and the negative terminal of the second bus bar, the second diode is cross-connected between the alternating current terminal of the AC/DC conversion circuit and the positive terminal of the second bus bar, and the third diode is cross-connected between the alternating current terminal of the AC/DC conversion circuit and the negative terminal of the second bus bar.

7. The on-board charging apparatus according to claim 1 ,

wherein the DC/DC conversion circuit comprises a second H-bridge rectifier circuit, an isolation transformer, and a third H-bridge rectifier circuit;

wherein a primary-side winding of the isolation transformer is coupled to the second H-bridge rectifier circuit, and a secondary-side winding of the isolation transformer is coupled to the third H-bridge rectifier circuit;

wherein the second H-bridge rectifier circuit is configured to: adjust the first direct current voltage and the second direct current voltage; and

wherein the third H-bridge rectifier circuit is configured to: rectify the adjusted first direct current voltage and the adjusted second direct current voltage, and output the third direct current voltage to the to-be-charged device.

8. The on-board charging apparatus according to claim 1 , further comprising a controller, configured to:

control the AC/DC conversion circuit to convert the first component into the first direct current voltage;

control the PFC circuit to convert the second component into the second direct current voltage; and

control the DC/DC conversion circuit to convert the first direct current voltage and the second direct current voltage into the third direct current voltage.

9. The on-board charging apparatus according to claim 1 , wherein the alternating current terminal of the AC/DC conversion circuit is a single-phase alternating current terminal.

10. A charging system, comprising:

an on-board charging apparatus, comprising: an alternating current to direct current conversion circuit (AC/DC conversion circuit), a power factor correction (PFC) circuit, and a direct current to direct current conversion circuit (DC/DC conversion circuit);

wherein an alternating current terminal of the AC/DC conversion circuit is connected to an alternating current terminal of the PFC circuit, a direct current terminal of the AC/DC conversion circuit is connected to a first direct current terminal of the DC/DC conversion circuit, and a direct current terminal of the PFC circuit is connected to a second direct current terminal of the DC/DC conversion circuit;

wherein the AC/DC conversion circuit is configured to: receive a first alternating current voltage at the alternating current terminal of the AC/DC conversion circuit, and convert a first component of the first alternating current voltage into a first direct current voltage;

wherein the PFC circuit is configured to: convert a second component of the first alternating current voltage into a second direct current voltage; and

wherein the DC/DC conversion circuit is configured to: convert the first direct current voltage and the second direct current voltage into a third direct current voltage, and output the third direct current voltage to a to-be-charged device.

11. The charging system according to claim 10 ,

wherein the PFC circuit comprises a boost circuit and a first bus bar;

wherein an input terminal of the boost circuit is the alternating current terminal of the PFC circuit, a first output terminal of the boost circuit is connected to a positive terminal of the first bus bar, a second output terminal is connected to a negative terminal of the first bus bar, the positive terminal of the first bus bar is connected to a first endpoint of the second direct current terminal of the DC/DC conversion circuit, and the negative terminal of the first bus bar is connected to a second endpoint of the second direct current terminal of the DC/DC conversion circuit;

wherein the boost circuit is configured to: convert the second component of the first alternating current voltage into the second direct current voltage; and

wherein the first bus bar is configured to: receive the second direct current voltage, and transmit the second direct current voltage to the DC/DC conversion circuit.

12. The charging system according to claim 11 ,

wherein the boost circuit comprises an energy storage inductor, a first diode, a first switching transistor, and a second switching transistor; and

wherein a first terminal of the energy storage inductor is connected to the alternating current terminal of the AC/DC conversion circuit, the first diode is cross-connected between the alternating current terminal of the AC/DC conversion circuit and the positive terminal of the first bus bar, a cathode of the first diode is connected to the positive terminal of the first bus bar, the first switching transistor is cross-connected between a second terminal of the energy storage inductor and the positive terminal of the first bus bar, and the second switching transistor is cross-connected between the second terminal of the energy storage inductor and the negative terminal of the first bus bar.

13. An electric vehicle, comprising:

a power battery pack; and

an on-board charging apparatus, comprising an alternating current to direct current conversion circuit (AC/DC conversion circuit), a power factor correction (PFC) circuit, and a direct current to direct current conversion circuit (DC/DC conversion circuit);

wherein an alternating current terminal of the AC/DC conversion circuit is connected to an alternating current terminal of the PFC circuit, a direct current terminal of the AC/DC conversion circuit is connected to a first direct current terminal of the DC/DC conversion circuit, and a direct current terminal of the PFC circuit is connected to a second direct current terminal of the DC/DC conversion circuit;

wherein the AC/DC conversion circuit is configured to: receive a first alternating current voltage at the alternating current terminal of the AC/DC conversion circuit, and convert a first component of the first alternating current voltage into a first direct current voltage;

wherein the PFC circuit is configured to: convert a second component of the first alternating current voltage into a second direct current voltage; and

wherein the DC/DC conversion circuit is configured to: convert the first direct current voltage and the second direct current voltage into a third direct current voltage, and output the third direct current voltage to the power battery pack.

14. The electric vehicle according to claim 13 ,

wherein the PFC circuit comprises a boost circuit and a first bus bar;

wherein an input terminal of the boost circuit is the alternating current terminal of the PFC circuit, a first output terminal of the boost circuit is connected to a positive terminal of the first bus bar, a second output terminal is connected to a negative terminal of the first bus bar, the positive terminal of the first bus bar is connected to a first endpoint of the second direct current terminal of the DC/DC conversion circuit, and the negative terminal of the first bus bar is connected to a second endpoint of the second direct current terminal of the DC/DC conversion circuit;

wherein the boost circuit is configured to: convert the second component of the first alternating current voltage into the second direct current voltage; and

wherein the first bus bar is configured to: receive the second direct current voltage, and transmit the second direct current voltage to the DC/DC conversion circuit.

15. The electric vehicle according to claim 14 ,

wherein the boost circuit comprises an energy storage inductor, a first diode, a first switching transistor, and a second switching transistor;

wherein a first terminal of the energy storage inductor is connected to the alternating current terminal of the AC/DC conversion circuit, the first diode is cross-connected between the alternating current terminal of the AC/DC conversion circuit and the positive terminal of the first bus bar, a cathode of the first diode is connected to the positive terminal of the first bus bar, the first switching transistor is cross-connected between a second terminal of the energy storage inductor and the positive terminal of the first bus bar, and the second switching transistor is cross-connected between the second terminal of the energy storage inductor and the negative terminal of the first bus bar; and

wherein the power battery pack is configured to supply power to the electric vehicle, and the on-board charging apparatus is configured to charge the power battery pack.