Patent ID: 7245509
Filing Date: 2007-07-17
Classification: H02M,H03K,H05B

Abstract:
1. A half bridge driver connected to a first side of a transformer and a DC power, the half bridge driver comprising: a first light-coupled switch for receiving a first control signal; a first NPN transformer having a collector coupled to the first terminal of the first light-coupled switch and a base coupled to the second terminal of the first light-coupled switch; a first PNP transformer having a base and an emitter coupled to the base and the emitter of the first NPN transformer respectively, and a collector coupled to the first side of the transformer; a first resistor coupled between the base and the collector of the first PNP transformer; a first capacitor coupled between the collector of the first NPN transformer and the collector of the first PNP transformer; a diode having a cathode coupled to the collector of the first NPN transformer and an anode coupled to a control power; a second light-coupled switch for receiving a second control signal, and having a first output terminal coupled to the control power via a second resistor and a second output terminal coupled to a reference terminal; a second PNP transformer having an emitter coupled to the control power and a base coupled to the first output terminal of the second light-coupled switch via a third resistor; a second NPN transformer having a base coupled to the first output terminal of the second light-coupled switch via a fourth resistor and the reference terminal via a fifth resistor, and an emitter coupled to the reference terminal and a collector coupled to the collector of the second PNP transformer; a first N-MOS having a gate coupled to the emitter of the first PNP transformer and a drain coupled to the DC power and a source coupled to the first side of the transformer; and a second N-MOS having a gate coupled to the collector of the second PNP transformer and a drain coupled to the source of the first N-MOS and a source coupled to the reference terminal.