US 7,733,053 B2Granted

Charging circuit for a vehicle charger

AssigneeCheng Uei Precision Industry Co., Ltd.

InventorsSe-Cherng Yang, Fu-Gen Yang

Life of this patent

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Abstract

A charging circuit for a vehicle charger includes a front high-voltage protective circuit, a rear high-voltage protective circuit, a first filtering circuit, an over-voltage protective circuit, a high frequency step-down switching regulator, a second filtering circuit, a frequency modulation circuit, a reference voltage input circuit, a sampling circuit, a short-circuit protective circuit and two charging interfaces. The front high-voltage protective circuit connects to a vehicle DC power, the first filtering circuit connects the front high-voltage protective circuit to the switching regulator, the second filtering circuit connects to an output point of the switching regulator to the rear high-voltage protection circuit, the frequency modulation circuit connects to a second input point of the switching regulator, the third input point of the switching regulator connects to the reference voltage input circuit, the short-circuit protective circuit connects the second filtering circuit to the fourth input point of the switching regulator, the sampling circuit connects the second filtering circuit to the fifth input point of the switching regulator, the rear high-voltage protection circuit connects to the two charging interfaces. For the unique design, the charging circuit for a vehicle charger has a short-circuit protective function and provides two charging interfaces.

Claims4

Dependent claims

A charging circuit for a vehicle charger, comprising:

a front high-voltage protective circuit, an input point of the front high-voltage protective circuit connected to a DC power;
a first filtering circuit, an input point of the first filtering circuit connected to an output point of the front high-voltage protective circuit;
a high frequency step-down switching regulator, having a first input point, a second input point, a third input point and a fourth input point, a fifth input point and an output point of the step-down switching regulator, the first input point connected to an output point of the first filtering circuit;
a second filtering circuit, connected to the output point of the high frequency step-down switching regulator;
a frequency modulation circuit, connected to the second input point of the high frequency step-down switching regulator;
a reference voltage input circuit, connected to the third input point of the high frequency step-down switching regulator;
a short-circuit protective circuit, connecting the fourth input point of the high frequency step-down switching regulator to an output point of the second filtering circuit;
a sampling circuit, connecting the output point of the second filtering circuit to the fifth input point of the high frequency step-down switching regulator;
a rear high-voltage protective circuit connected to the output point of the second filtering circuit;
a first charging circuit, connected to an output point of the rear high-voltage protective circuit;
and
a second charging circuit, connected to the output point of the rear high-voltage protective circuit.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/924,381Filed 25 Oct 2007
Published: US 2009/0108825 A130 Apr 2009
Granted: 8 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H02J 7/1423
For charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle: with multiple batteries
H02J 7/06
Regulation of charging current or voltage: using discharge tubes or semiconductor devices
H02J 7/02
Circuit arrangements for charging or discharging batteries or for supplying loads from batteries: for charging batteries from AC mains by converters
H02J 7/62
Including safety or protection arrangements: against overcurrent