Full bridge inverter with push/pull control chip

• US 7,242,594 B2
• Filed: 09/08/2004
• Issued: 07/10/2007
• Est. Priority Date: 02/10/2004
• Status: Expired due to Fees

• Current Assignee: Lien Chang Electronic
• Original Assignee: Lien Chang Electronic Enterprise Co Ltd
• Inventors: Chan, Chun-Kong, Wang, Jeng-Shong
• Primary Examiner(s): HAN, YOUNGHUIE JESSICA
• Application Number:
  US10/935,129
• Publication Number:
  US 20060050543A1
• Time in Patent Office: 1,035 Days
• Field of Search: 363/16, 363/17, 363/25, 363/26, 363/98, 363/132, 363/133, 363/134, 315/308, 327/110, 327/112
• US Class Current: 363/17
• CPC Class Codes: H02M 1/08 Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• CPC Class Codes: H02M 3/33573 Full-bridge at primary side of an isolation transformer
• CPC Class Codes: H02M 7/5387 in a bridge configuration

Abstract

A full bridge inverter with a push/pull control chip uses two similar drivers to connect to the prior art full bridge switch assembly, and controls the prior art full bridge switch assembly with the push/pull control chip. The full bridge inverter comprises a push/pull control chip with two output terminals. Two drivers both have an input terminal and an output terminal. The input terminal is connected to the output terminals of the push/pull control chip and a full bridge switch assembly with four electronic switches. Each electronic switch has a control terminal connected to the output terminal of the two drivers so as to convert DC power into AC power by the two drivers.

Claims

1. A full bridge inverter connected to a primary winding of a transformer for converting DC power into AC power, the full bridge inverter comprising:

a push/pull control chip having two output terminals;

two drivers, both having an input terminal and an output terminal with the input terminals thereof connected to the output terminals of the push/pull control chip, and controlled by the push/pull control chip; and

a full bridge switch assembly having four electronic switches, each electronic switch having a control terminal connected to the output terminal of the two drivers so as to convert the DC power into the AC power by the two drivers.

2. The full bridge inverter of claim 1, wherein the four electronic switches comprise two P-MOSFETs and two N-MOSFETs, and a P-MOSFET and an N-MOSFET form a positive half cycle driver and a negative half cycle driver.

3. The full bridge inverter of claim 1, wherein each source of the two P-MOSFETs is connected to the DC power.

4. The full bridge inverter of claim 1, wherein each source of the two N-MOSFETs is connected to a reference terminal.

5. The full bridge inverter of claim 1, wherein the driver comprises:

a first accelerated diode connected to the output terminal of the push/pull control chip with a negative pole terminal and connected to the control terminal of the electronic switch with a positive pole terminal;

a first resistor in parallel with the first accelerated diode;

a second accelerated diode connected to the control terminal of the electronic switch with a negative pole terminal and connected to the output terminal of the push/pull control chip through a link capacitor with a positive pole terminal;

a second resistor in parallel with the second accelerated diode; and

a Zener diode connected to a positive pole terminal of the second accelerated diode with a positive pole terminal and connected to the DC power with a negative pole terminal; and

a third resistor in parallel with the Zener diode.

6. The full bridge inverter of claim 1, further comprising a capacitor connected between the primary winding of the transformer and the full bridge switch assembly for disconnecting the DC component of the AC power.