Vehicle power-supply control device

Patent metadata

Field	Value
Publication number	US-9469262-B2
Application number	US-201313917089-A
Country	US
Kind code	B2
Filing date	Jun 13, 2013
Priority date	Jun 15, 2012
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

A vehicle power-supply control device has a battery charger that converts an externally-supplied AC voltage into a DC voltage used to charge a vehicle high-voltage battery, a low-voltage power generator that converts the DC voltage output from the battery charger into a DC voltage used to drive a vehicle auxiliary machine, and a controller that controls the battery charger and the low-voltage power generator. The battery charger includes a power factor correction circuit that corrects a power factor of the AC voltage and a first DC/DC converter that generates a predetermined DC voltage based on an output of the power factor correction circuit. The low-voltage power generator includes a second DC/DC converter that steps down the DC voltage output from the battery charger and a synchronous rectifier that rectifies an output of the second DC/DC converter in synchronization with a switching operation of the second DC/DC converter.

First claim

What is claimed is:

1. A vehicle power-supply control device comprising:
a battery charger that converts an externally-supplied AC voltage into a DC voltage used to charge a vehicle high-voltage battery;
a low-voltage power generator that converts the DC voltage output from the battery charger into a DC voltage used to drive a vehicle auxiliary machine; and
a controller that controls the battery charger and the low-voltage power generator,
wherein the battery charger includes a power factor correction circuit that corrects a power factor of the AC voltage and a first DC/DC converter that generates a predetermined DC voltage based on an output of the power factor correction circuit,
wherein the low-voltage power generator includes a second DC/DC converter that steps down the DC voltage output from the battery charger and a synchronous rectifier that rectifies an output of the second DC/DC converter in synchronization with a switching operation of the second DC/DC converter,
wherein the synchronous rectifier includes a pair of switching elements that performs a switching operation in synchronization with the switching operation of the second DC/DC converter and a pair of diodes that is connected in parallel with the pair of switching elements respectively,
wherein when the high-voltage battery is currently charged, the controller stops control of the synchronous rectifier while controlling the first DC/DC converter and controlling the second DC/DC converter to generate the DC voltage to drive the vehicle auxiliary machine,
wherein when the high-voltage battery is not currently charged, the controller stops the control of the first DC/DC converter while controlling the second DC/DC converter and the synchronous rectifier, and
wherein when the control of the synchronous rectifier is stopped, diode rectification is performed by the pair of diodes to output the rectified DC voltage from the second DC/DC converter through each of the diodes.

2. The vehicle power-supply control device according to claim 1 ,
wherein the controller determines whether an output current of the low-voltage power generator is less than or equal to a predetermined threshold when the high-voltage battery is currently charged,
wherein the controller stops the control of the synchronous rectifier when the output current is less than or equal to the threshold, and
wherein the controller controls the synchronous rectifier when the output current is greater than the threshold.

3. The vehicle power-supply control device according to claim 1 ,
wherein the controller determines whether a vehicle is currently started up when the high-voltage battery is not currently charged,
wherein the controller stops the control of the first DC/DC converter while controlling the second DC/DC converter and the synchronous rectifier when the vehicle is currently started up, and
wherein the controller stops the control of the first DC/DC converter, the second DC/DC converter, and the synchronous rectifier when the vehicle is not currently started up.

Assignees

• Ido Yusaku
• Yamada Takashi
• Nishiguchi Tadao
• Hanatani masayuki
• Yasugi Hideyuki
• Omron Automotive Electronics

Inventors

• Ido Yusaku
• Yamada Takashi
• Nishiguchi Tadao
• Hanatani masayuki
• Yasugi Hideyuki

Classifications

• Y02T10/7072

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

• B60L1/14

  to electric lighting circuits · CPC title

• Y02T90/14

  Plug-in electric vehicles · CPC title

• B60L58/20

  having different nominal voltages · CPC title

• B60L1/003

  to auxiliary motors, e.g. for pumps, compressors · CPC title