Zero-voltage transmission half bridgeless power factor correction converter

Abstract

The invention discloses a zero-voltage transmission half bridgeless Boost PFC converter. According to the invention, only by adding a rapid recovery diode D7 can an RCD clamp network be replaced; parasitic oscillation during cutting off of quasi zero current of an auxiliary switch tube is inhibited; the topology of the converter is simplified; and when the auxiliary switch tube is turned off, exciting current will be introduced into a parasitic capacitor, and is fully used by a circuit, so the overall efficiency of the converter is improved. In addition, through the provided converter, natural turning on and turning off of a zero voltage switch and a boost diode of a main switch tube are achieved; natural switching on and off of each connected diode in the circuit is also achieved; technical problems of complex topology, quite high cost and quite low overall efficiency of a converter in the prior art are solved; and the provided converter can be well popularized in actual application.

Description

technical field [0001] The present invention relates to a soft-switching power factor correction converter, and more specifically relates to a zero-voltage switching power factor correction converter used in large and medium power applications. Background technique [0002] Adding a single-phase power factor correction converter in the front stage of various power electronic devices is the main way to solve the harmonic pollution of the power grid at present. Among single-phase power factor correction converter topologies, the general-purpose bridgeless Boost PFC converter has become an ideal converter topology for large and medium power applications due to its greatly reduced conduction loss. But its inherent high common mode interference brings great limitations to its application in the industry. In view of the above problems, the existing literature has proposed a semi-bridgeless Boost PFC converter, such as figure 1 shown. The converter connects the power supply and ...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a ZVT semi-bridgeless power factor correction converter, which can also realize the quasi-ZCS turn-off of the auxiliary switching tube and suppress its parasitic oscillation, and can also solve the problems of the prior art The technical problems of complex topology, high cost and low overall efficiency of the medium converter

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