On-vehicle power supply system and electric vehicle

Patent metadata

Field	Value
Publication number	US-2016159235-A1
Application number	US-201414900927-A
Country	US
Kind code	A1
Filing date	Jun 30, 2014
Priority date	Jun 28, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

An on-vehicle power supply system and an electric vehicle are provided. The on-vehicle power supply system includes: a power battery ( 10 ); a charge-discharge socket ( 20 ) connected with an external load ( 1001 ); a three-level bidirectional DC-AC module ( 30 ) having a first DC terminal connected with a first terminal of the power battery ( 10 ) and a second DC terminal connected with a second terminal of the power battery ( 10 ); a charge-discharge control module ( 50 ) having a first terminal connected with an AC terminal of the three-level bidirectional DC-AC module ( 30 ) and a second terminal connected with the charge-discharge socket ( 20 ); and a control module ( 60 ) connected with the charge-discharge control module ( 50 ) and the three-level bidirectional DC-AC module ( 30 ), and configured to control the three-level bidirectional DC-AC module ( 30 ) to convert a DC voltage of the power battery ( 10 ) into an AC voltage.

First claim

1 . An on-vehicle power supply system, comprising:
a power battery; a charge-discharge socket configured to connect with an external load; a three-level bidirectional DC-AC module having a first DC terminal connected with a first terminal of the power battery and a second DC terminal connected with a second terminal of the power battery; a charge-discharge control module having a first terminal connected with an AC terminal of the three-level bidirectional DC-AC module and a second terminal connected with the charge-discharge socket; and a control module connected with a third terminal of the charge-discharge control module and a control terminal of the three-level bidirectional DC-AC module, and the control module being configured to control the three-level bidirectional DC-AC module to convert a DC voltage of the power battery into an AC voltage with a predetermined value, and to provide the AC voltage to the external load via the charge-discharge control module and the charge-discharge socket.

2 . The on-vehicle power supply system according to claim 1 , further comprising:
a connection assembly connected between the charge-discharge socket and the external load.

3 . The on-vehicle power supply system according to claim 2 , wherein the connection assembly comprises:
a charging gun adaptor connected with the charge-discharge socket; and a power interface connected with the charging gun adaptor and configured to be an interface for the external load.

4 . The on-vehicle power supply system according to claim 1 , wherein the external load is an electrical equipment.

5 . The on-vehicle power supply system according to claim 1 , further comprising:
a motor control switch having a first terminal connected with the AC terminal of the three-level bidirectional DC-AC module and a second terminal configured to connect with a motor of the electric vehicle, wherein the control module is connected with the motor control switch and configured to control the motor control switch according to a current working mode of the on-vehicle power supply system.

6 . The on-vehicle power supply system according to claim 5 , wherein when the on-vehicle power supply system is in a driving mode, the control module controls the motor control switch to be turned on and controls the charge-discharge control module to be turned off; and
when the on-vehicle power supply system is in a charge-discharge mode, the control module controls the motor control switch to be turned off and controls the charge-discharge control module to be turned on to start the three-level bidirectional DC-AC module.

7 . The on-vehicle power supply system according to claim 1 , wherein the three-level bidirectional DC-AC module comprises:
a first capacitor and a second capacitor connected in series and connected between the first DC terminal and the second DC terminal of the three-level bidirectional DC-AC module in which a first node is defined between the first capacitor and the second capacitor; a first IGBT and a second IGBT connected in series and connected between the first DC terminal and the second DC terminal of the three-level bidirectional DC-AC module, in which a second node is defined between the first IGBT and the second IGBT; a third IGBT and a fourth IGBT connected in series and connected between the first node and the second node; a fifth IGBT and a sixth IGBT connected in series and connected between the first DC terminal and the second DC terminal of the three-level bidirectional DC-AC module, in which a third node is defined between the fifth IGBT and the sixth IGBT; a seventh IGBT and an eighth IGBT connected in series and connected between the first node and the third node; a ninth IGBT and a tenth IGBT connected in series and connected between the first DC terminal and the second DC terminal of the three-level bidirectional DC-AC module, in which a fourth node is defined between the ninth IGBT and the tenth IGBT; and an eleventh IGBT and a twelfth IGBT connected in series and connected between the first node and the fourth node; wherein the second node, the third node and the fourth node are configured as the AC terminal of the three-level bidirectional DC-AC module.

8 . The on-vehicle power supply system according to claim 1 , further comprising:
a first common-mode capacitor and a second common-mode capacitor connected in series and connected between the first terminal and the second terminal of the power battery, in which a node between the first common-mode capacitor and the second common-mode capacitor is grounded.

9 . The on-vehicle power supply system according to claim 7 , further comprising:
a filtering module connected between the three-level bidirectional DC-AC module and the charge-discharge control module and configured to eliminate a harmonic wave.

10 . The on-vehicle power supply system according to claim 9 , further comprising:
a filtering control module connected between the first node and the filtering module, wherein the control module controls the filtering control module to be turned off when the external power system is in the driving mode.

11 . The on-vehicle power supply system according to claim 1 , further comprising:
an EMI-filter module connected between the charge-discharge socket and the charge-discharge control module and configured to filter interference of conduction and radiation.

12 . The on-vehicle power supply system according to claim 9 , further comprising:
a pre-charging control module connected with the charge-discharge control module in parallel and configured to charge a capacitor in the filtering module until a voltage of the capacitor in the filtering module reaches a predetermined threshold; wherein after the voltage of the capacitor in the filtering module reaches the predetermined threshold, the control module controls the pre-charging control module to be turned off and controls the charge-discharge control module to be turned on.

13 . The on-vehicle power supply system according to claim 1 , wherein the charge-discharge control module further comprises:
a three-phase switch and/or a single-phase switch configured to implement a three-phase charge-discharge or a single-phase charge-discharge.

14 . An electric vehicle comprising the on-vehicle power supply system according to claim 1 .

Assignees

• Byd Co Ltd

Inventors

• Yang Guangming
• Hu Min

Classifications

• H02J7/685

  using connection detecting circuits (H02J7/68 takes precedence) · CPC title

• H02J7/96

  in response to battery voltage · CPC title

• Y02T10/7072

  Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors · CPC title

• B60L53/24

  Using the vehicle's propulsion converter for charging · CPC title

• B60L2220/54

  Windings for different functions · CPC title