Buffer circuit, and power conversion device using same

A power converter and buffer circuit technology, applied in the direction of AC power input conversion to DC power output, DC power input conversion to DC power output, high-efficiency power electronic conversion, etc. The effect of changing and reducing power loss
CN1193488CInactive Publication Date: 2005-03-16ORMON CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ORMON CORP
Publication Date
2005-03-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention has a first series circuit consisting of a capacitor and a diode and a second series circuit consisting of a coil and a diode, the first series circuit is connected in parallel to the commutating diode in a state that the capacitor is connected to a choke coil side in the commutating diode, and the second series circuit is connected between a connecting portion of the capacitor and the diode in the first series circuit and a commutating diode non-connecting side in the choke coil.
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Description

technical field

[0001] The present invention relates to a snubber circuit for suppressing voltage ringing when a switching element is turned off, and a power converter, such as a switching power supply, using the snubber circuit. Background technique

[0002] Examples of the power converter include an isolated switching power supply using a converter transformer and a non-isolated switching power supply not using a converter transformer.

[0003] In both types of switching power supplies, the switching element is subjected to a sudden voltage change (voltage transient) when it is turned off due to the leakage inductance of the choke coil or the primary winding of the converter transformer.

[0004] Snubber circuits are provided primarily to suppress voltage transients.

[0005] If the switching power supply has a large leakage inductance in the primary winding of the converter transformer, the voltage transient when the switching element is turned ...

Claims

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