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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

Pending Publication Date: 2021-06-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, semiconductor devices in its topology have high conduction losses, and switched capacitor cells produce significant current spikes
Repetitive current spikes increase current stress and noise in semiconductors
Especially in high-power applications, excessive repetitive current spikes can damage semiconductor devices

Method used

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  • Bridgeless isolation type switched capacitor SEPIC PFC converter
  • Bridgeless isolation type switched capacitor SEPIC PFC converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this example, see figure 2 , a bridgeless isolated switched capacitor SEPIC PFC converter, its topology is composed of two power switch tubes, an inductor L, a transformer T, five diodes and four capacitors; the two power switch tubes are the first Switch tube S 1 and the second switch tube S 2 ; The five diodes are respectively the first diode D 1 , the second diode D 2 , the third diode D 3 , the fourth diode D 4 and the fifth diode D 5 ; The four capacitors are respectively the first capacitor C 1 , the second capacitance C 2 , the third capacitor C 3 and the fourth capacitor C 0 ;

[0028] Among them, one end of the inductor L is connected to the input AC power V in Connected, the other end of the inductor L is connected to the first diode D 1 and the second diode D 2 connected to the public end;

[0029] first diode D 1 One end of the inductor L and the second diode D 2 The common terminal is connected, the first diode D 1 The other end is conn...

Embodiment 2

[0042] This embodiment is basically the same as Embodiment 1, especially in that:

[0043] In this embodiment, the two switch tubes are controlled by the same control signal. It is also possible to realize a bridgeless structure by using a switching tube instead of a diode, thereby improving the efficiency of the converter system and simplifying the control strategy.

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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.

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.1159–1171, May 200...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M1/42H02M3/335
CPCH02M7/217H02M1/4208H02M3/33569Y02B70/10
Inventor 罗建林翔金志辉范坤鹏
Owner SHANGHAI UNIV
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