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US 2006/0133116 A1Published application
Synchronous rectifier gate drive shutdown circuit
AssigneeArtesyn Technologies, Inc.
InventorsTodd Schaible, John Schmitz
Life of this patent
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AssigneeArtesyn Technologies, Inc.
InventorsTodd Schaible, John Schmitz
Estimating the term…
A power converter is disclosed. According to various embodiments, the power converter includes a transformer, a bridge input circuit, a self-driven synchronous rectifier circuit, a gate drive circuit, and a gate drive shutdown circuit. The transformer includes a primary winding connected to the bridge input circuit, a first secondary winding, and a second secondary winding. The self-driven synchronous rectifier circuit is connected to the first secondary winding and includes a first synchronous rectifier for rectifying a voltage across the first secondary winding. The first synchronous rectifier includes a control terminal responsive to a voltage across the second secondary winding. The gate drive circuit includes a first diode connected to the control terminal of the first synchronous rectifier for introducing a dc level shift thereto. The gate drive shutdown circuit is connected to the first diode of the gate drive circuit and includes a switch for removing the dc level shift from the control terminal of the first synchronous rectifier when operation of the bridge input circuit is terminated.
A power converter, comprising:
In a power converter comprising a bridge input circuit and a self-driven synchronous rectifier circuit, a gate drive shutdown circuit comprising a switch for removing a dc level shift from a control terminal of the synchronous rectifier circuit when operation of the bridge input circuit is terminated.
The gate drive shutdown circuit of claim 12, wherein switch of the gate drive shutdown circuit includes a control terminal responsive to a signal received from the self-driven synchronous rectifier circuit.
The gate drive shutdown circuit of claim 14, wherein the signal received from the bridge input circuit is a PWM control signal.
The gate drive shutdown circuit of claim 16, wherein the isolator includes an opto-coupler.
In a power converter comprising a bridge input circuit and a self-driven synchronous rectifier circuit, a method for reducing self-oscillation in the synchronous rectification circuit due to negative current flowing therein when operation of the bridge input circuit is terminated, the method comprising:
A power converter, comprising:
Dependencies are inferred from the claim text.