Application US20190176652

ELECTRIC VEHICLE, MULTIFUNCTIONAL CAR CHARGER FOR ELECTRIC VEHICLE, AND CONTROL METHOD THEREOF
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US20190176652

1. A multifunctional car charger for an electric vehicle, comprising: (6) (5)

a bidirectional AC/DC conversion circuit, wherein an alternating-current end of the bidirectional AC/DC conversion circuit is configured for coupling to a power grid;

a first DC/DC conversion circuit, wherein a first direct-current end of the first DC/DC conversion circuit is coupled to a direct-current end of the bidirectional AC/DC conversion circuit, and a second direct-current end of the first DC/DC conversion circuit is configured for coupling to a power battery of the electric vehicle;

a second DC/DC conversion circuit, wherein a first direct-current end of the second DC/DC conversion circuit is respectively coupled to a direct-current end of the bidirectional AC/DC conversion circuit and the first direct-current end of the first DC/DC conversion circuit, and a second direct-current end of the second DC/DC conversion circuit is configured for coupling to a low-voltage battery of the electric vehicle;

a sampling circuit, wherein the sampling circuit is configured to sample a voltage and a current of the power grid, a voltage of the direct-current end of the bidirectional AC/DC conversion circuit, a voltage and a current of the power battery and a voltage and a current of the low-voltage battery respectively; and

a control module, in which a first control circuit for controlling the bidirectional AC/DC conversion circuit, a second control circuit for controlling the first DC/DC conversion circuit and a third control circuit for controlling the second DC/DC conversion circuit are integrated, wherein the control module is configured to correspondingly control the bidirectional AC/DC conversion circuit, the first DC/DC conversion circuit and the second DC/DC conversion circuit through the first control circuit, the second control circuit and the third control circuit according to the voltage and the current of the power grid, the voltage of the direct-current end of the bidirectional AC/DC conversion circuit, the voltage and the current of the power battery and the voltage and the current of the low-voltage battery that are sampled by the sampling circuit, to realize any one of a power battery charging function, a low-voltage battery charging function, a power battery alternating-current inversion function, a low-voltage battery alternating-current inversion function and a power battery low-voltage loaded output function.

2. The multifunctional car charger for an electric vehicle according to claim 1, wherein (2) (1)

the control module is further configured to correspondingly control the bidirectional AC/DC conversion circuit, the first DC/DC conversion circuit and the second DC/DC conversion circuit through the first control circuit, the second control circuit and the third control circuit according to the voltage and the current of the power grid, the voltage of the direct-current end of the bidirectional AC/DC conversion circuit, the voltage and the current of the power battery and the voltage and the current of the low-voltage battery that are sampled by the sampling circuit, to realize the power battery charging function and the low-voltage battery charging function, or the power battery alternating-current inversion function and the power battery low-voltage loaded output function, or the power battery alternating-current inversion function and the low-voltage battery alternating-current inversion function.

4. The multifunctional car charger for an electric vehicle according to claim 2, wherein when the multifunctional car charger is in a charging state, the control module is further configured to, (1) (2)

control the bidirectional AC/DC conversion circuit and the second DC/DC conversion circuit to charge the low-voltage battery when the level of the low-voltage battery is less than a first preset value; and

control the bidirectional AC/DC conversion circuit, the first DC/DC conversion circuit and the second DC/DC conversion circuit to respectively supply power to a low-voltage load of the electric vehicle and charge the power battery when the level of the low-voltage battery is greater than or equal to the first preset value and the power battery is in a not fully-charged state.

5. The multifunctional car charger for an electric vehicle according to claim 4, wherein the control module is further configured to determine whether the power battery and the low-voltage battery are abnormal and control the multifunctional car charger to stop charging when the power battery and the low-voltage battery are abnormal when the multifunctional car charger is in a charging state. (0)

6. The multifunctional car charger for an electric vehicle according to claim 2, wherein the control module is further configured to determine whether the electric vehicle is in a running state when the multifunctional car charger is in a discharging state, wherein (1) (1)

the control module controls the first DC/DC conversion circuit and the second DC/DC conversion circuit to supply power to the low-voltage load of the electric vehicle through the power battery when the electric vehicle is in the running state, and controls the bidirectional AC/DC conversion circuit to operate when receiving an alternating-current discharge demand instruction such that the power battery performs alternating-current discharge simultaneously through the first DC/DC conversion circuit and the bidirectional AC/DC conversion circuit.

7. The multifunctional car charger for an electric vehicle according to claim 6, wherein the control module is further configured to determine whether the level of the low-voltage battery is less than the first preset value when the multifunctional car charger is in the discharging state and the electric vehicle is in a stop state, and when receiving the alternating-current discharge demand instruction, wherein (0) (2)

3. The multifunctional car charger for an electric vehicle according to claim 1, wherein the sampling circuit is integrated in the control module. (0)

8. The multifunctional car charger for an electric vehicle according to claim 1, wherein (0) (1)

9. The multifunctional car charger for an electric vehicle according to claim 1, wherein (0) (1)

10. The multifunctional car charger for an electric vehicle according to claim 1, wherein (0) (1)

11. An electric vehicle, comprising the multifunctional car charger for an electric vehicle according to claim 1. (0)

12. A control method of a multifunctional car charger for an electric vehicle, wherein the multifunctional car charger for an electric vehicle comprises a bidirectional AC/DC conversion circuit, a first DC/DC conversion circuit and a second DC/DC conversion circuit, an alternating-current end of the bidirectional AC/DC conversion circuit is configured for coupling to a power grid, a first direct-current end of the first DC/DC conversion circuit is connected to a direct-current end of the bidirectional AC/DC conversion circuit, a second direct-current end of the first DC/DC conversion circuit is configured for coupling to a power battery of the electric vehicle, a first direct-current end of the second DC/DC conversion circuit is respectively coupled to a direct-current end of the bidirectional AC/DC conversion circuit and the first direct-current end of the first DC/DC conversion circuit, and a second direct-current end of the second DC/DC conversion circuit is configured for coupling to a low-voltage battery of the electric vehicle, the method comprising: (2) (2)

sampling a voltage and a current of the power grid, a voltage of the direct-current end of the bidirectional AC/DC conversion circuit, a voltage and a current of the power battery and a voltage and a current of the low-voltage battery respectively; and

controlling the bidirectional AC/DC conversion circuit, the first DC/DC conversion circuit and the second DC/DC conversion circuit according to the voltage and the current of the power grid, the voltage of the direct-current end of the bidirectional AC/DC conversion circuit, the voltage and the current of the power battery and the voltage and the current of the low-voltage battery that are sampled, to realize any one of a power battery charging function, a low-voltage battery charging function, a power battery alternating-current inversion function, a low-voltage battery alternating-current inversion function and a power battery low-voltage loaded output function.

13. The method according to claim 12, further comprising: (0) (1)

14. The method according to claim 12, wherein when the multifunctional car charger is in a charging state, (1) (2)

the bidirectional AC/DC conversion circuit and the second DC/DC conversion circuit are controlled to charge the low-voltage battery when the level of the low-voltage battery is less than a first preset value; and

the bidirectional AC/DC conversion circuit, the first DC/DC conversion circuit and the second DC/DC conversion circuit are controlled to respectively supply power to a low-voltage load of the electric vehicle and charge the power battery when the level of the low-voltage battery is greater than or equal to the first preset value and the power battery is in a not fully-charged state.

15. The method according to claim 14, wherein when the multifunctional car charger is in a charging state, whether the power battery and the low-voltage battery are abnormal is determined and the multifunctional car charger is controlled to stop charging when the power battery and the low-voltage battery are abnormal. (0)

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Application US20190176652

ELECTRIC VEHICLE, MULTIFUNCTIONAL CAR CHARGER FOR ELECTRIC VEHICLE, AND CONTROL METHOD THEREOF

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