Charging circuit for a vehicle charger

• US 7,733,053 B2
• Filed: 10/25/2007
• Issued: 06/08/2010
• Est. Priority Date: 10/26/2007
• Status: Expired due to Fees

• Current Assignee: Cheng UEI Precision Industry Company Limited
• Original Assignee: Cheng UEI Precision Industry Company Limited
• Inventors: Yang, Fu-Gen, Yang, Se-Cherng
• Primary Examiner(s): Tso; Edward
• Assistant Examiner(s): Berhanu; Samuel
• Application Number:
  US11/924,381
• Publication Number:
  US 20090108825A1
• Time in Patent Office: 957 Days
• Field of Search: 320/104, 320112-114
• US Class Current: 320/104
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• CPC Class Codes: H02J 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: H02J 7/06 using discharge tubes or semiconductor devices
• CPC Class Codes: H02J 7/1423 with multiple batteries

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.

Claims

1. 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.

2. The charging circuit for a vehicle charger as set forth in claim 1, wherein the short-circuit protective circuit includes three resistances, a triode transistor and a capacitor.

3. The charging circuit for a vehicle charger as set forth in claim 1, further comprising an over-voltage protective circuit, the over-voltage protective circuit connecting the output point of the second filtering circuit to the fifth input point of the high frequency step-down switching regulator.

4. The charging circuit for a vehicle charger as set forth in claim 1, further comprising a compensation circuit, the compensation circuit connecting to an input of the high frequency step-down switching regulator to compensate the frequency loss of the high frequency step-down switching regulator, the compensation circuit composed by two capacitances and a resistance, one of the capacitances connecting the resistance in series, the other capacitance connects with the capacitance and the resistance in parallel.