Bridgeless isolation type switched capacitor SEPIC PFC converter

A switched capacitor and isolation technology, applied in the field of power factor correction circuit equipment and bridgeless isolated switched capacitor SEPICPFC converters, can solve the problems of increasing semiconductor current stress and noise, switching capacitor unit current spikes, damaging semiconductor devices, etc. Achieve the effect of reducing current spikes, high voltage gain, and low conduction loss
CN112953264APending Publication Date: 2021-06-11SHANGHAI UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI UNIV
Publication Date
2021-06-11

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Abstract

The invention discloses a bridgeless isolation type switched capacitor SEPIC PFC converter. The topological structure of the bridgeless isolation type switched capacitor SEPIC PFC converter is composed of two power switch tubes, an inductor, a transformer, five diodes and four capacitors, a bridgeless topological structure is adopted, and semiconductor loss is low. In addition, an inductor is replaced by a transformer, so that an isolation effect is achieved, the leakage inductance of the transformer is utilized, and the current peak in the converter can be effectively reduced. The high-gain bridgeless switched capacitor SEPIC PFC converter disclosed by the invention can generate an extremely high power factor and low surge current, is favorable for reducing the cost of the converter, and meets the IEC 61000-3-2 standard requirement.
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Description

technical field

[0001] The invention relates to a power factor correction circuit device of a power supply system, in particular to a bridgeless isolated switched capacitor SEPIC PFC converter, which is applied in the technical field of power supply systems. Background technique

[0002] Power factor correction (Power factor correction, PFC) converters are widely used in single-phase power electronic equipment power supply systems. Among them, SEPIC PFC is widely praised for its advantages such as low inrush current, continuous input current and high power factor. However, the traditional SEPIC PFC converter has a low voltage gain and is difficult to apply to high-voltage fields. In order to improve the voltage gain of the traditional SEPIC PFC converter, literature (E.H.Ismail, M.A.Al-Saffar, A.J.Sabzali and A.A.Fardoun, "A family of single-switch PWM converters with high step-upconversion ratio," IEEE Trans.Circuits Syst.I, Reg.Papers, vol.55, no.4, pp.1159โ€“1171, May 200...

Claims

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