ELECTRIC VEHICLE POWER CONVERSION SYSTEM

• US 20150097501A1
• Filed: 09/10/2014
• Published: 04/09/2015
• Est. Priority Date: 10/04/2013
• Status: Abandoned Application

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: YAMANE, Futoshi, ISHIKAWA, Masami, MURAOKA, Mitsutoshi, YOSHIDA, Taro, FURUSAWA, Kenji, MURAYAMA, Yoshinari
• Application Number:
  US14/482,122
• Publication Number:
  US 20150097501A1
• Time in Patent Office: Days
• US Class Current: 318/400.3
• CPC Class Codes: B60L 1/00 Supplying electric power to auxiliary equipment of vehicles circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: B60L 2210/12 Buck converters
• CPC Class Codes: B60L 2210/14 Boost converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/0069 relating to the isolation, e.g. ground fault or leak current
• CPC Class Codes: B60L 3/0092 with use of redundant elements for safety purposes
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 3/06 Limiting the traction current under mechanical overload conditions
• CPC Class Codes: B60L 50/12 using AC generators and DC motors
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: H02M 1/32 Means for protecting converters other than automatic disconnection
• CPC Class Codes: H02M 1/322 Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
• CPC Class Codes: H02P 6/24 Arrangements for stopping
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

An electric vehicle power conversion system may include an exclusive discharge circuit for discharging stored charges of a smoothing condenser. The electric vehicle power conversion system may also include a discharge controller for driving a DC/DC converter if a control circuit for controlling the electric vehicle power conversion system detects a fault of an exclusive discharge circuit, such that the stored charges of the smoothing condenser may be supplied to auxiliary devices or a DC auxiliary power supply and be discharged therethrough.

Claims

1. An electric vehicle power conversion system, comprising:

a motor driving power system connected to a DC main power supply and outputting a DC voltage therefrom to a motor generator through an inverter circuit;

an auxiliary device power system connected to the DC main power supply in parallel with the motor driving power system and supplying power to a DC auxiliary power supply or auxiliary devices of an electric vehicle through a DC/DC converter; and

a control circuit that controls the motor driving power system and the auxiliary device power system,

wherein the motor driving power system includes a smoothing condenser that smoothes the DC voltage, a resistor, and a semiconductor switch element connected in series and includes an exclusive discharge circuit for discharging stored charges from the smoothing condenser, and

wherein the control circuit includes a discharge controller that drives the DC/DC converter upon detecting a failure of the exclusive discharge circuit and to supply the stored charges from the smoothing condenser to the auxiliary devices or the DC auxiliary power supply and discharge the stored charges therethrough.

2. The electric vehicle power conversion system as claimed in claim 1, wherein a failure of the exclusive discharge circuit is detectable by the discharge controller when an inter-terminal voltage of the smoothing condenser is not discharged to a target voltage within a predetermined time from a starting of a discharging.

3. The electric vehicle power conversion system as claimed in claim 1, wherein the motor driving power system includes a voltage booster circuit that voltage-converts the DC voltage from the DC main power supply.

4. The electric vehicle power conversion system as claimed in claim 3, wherein the smoothing condenser includes a first smoothing condenser connected between the DC main power supply and the voltage booster circuit, and a second smoothing condenser connected between the voltage booster circuit and the inverter circuit.