LLC circuit of single-stage PFC

A circuit and single-stage technology, applied in electrical components, adjusting electrical variables, high-efficiency power electronic conversion, etc., can solve the problems of large power frequency ripple and low bandwidth of output voltage, achieve small power frequency ripple and reduce product volume , high efficiency effect

Active Publication Date: 2020-10-02
奇普电源(常州)有限公司
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AI Technical Summary

Problems solved by technology

[0006] In this way, in order to realize the function of single-stage PFC, the output feedback loop needs to be much less than twice the power frequency frequency, and the bandwidth is very low. Generally, it is designed to be 10Hz~20Hz, so the power frequency ripple on the output voltage is very large.

Method used

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  • LLC circuit of single-stage PFC
  • LLC circuit of single-stage PFC
  • LLC circuit of single-stage PFC

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0041] like image 3 As shown, a single-stage PFC LLC circuit includes: an input rectifier 31, a Boost converter 32 and an isolated DC-DC converter 33; the input rectifier 31 rectifies the input voltage and forms a capacitor C1 in the Boost converter. Charging loop; Boost converter 32 also includes first inductor L1, first switching element Q1 and second switching element Q2; isolated DC-DC converter 33 includes first switching element Q1 and second switching element shared with Boost converter 32 The bridge arm structure of the component Q2, the resonant inductor Lr, the resonant capacitor Cr, the first transformer T1 and the rectification and filtering circuit; the primary winding of the firs...

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Abstract

The invention relates to an LLC circuit of a single-stage PFC. An input rectifier forms a loop for charging a capacitor in a Boost converter; the Boost converter further comprises a first inductor, afirst switching element and a second switching element; and the isolated DC-DC converter comprises a bridge arm structure, a resonant inductor, a resonant capacitor, a transformer and a rectificationfilter circuit. One end of the first inductor is connected with the first output end of the input rectifier, the other end of the first inductor is connected with a center tap of the primary winding,and the connection point is connected with the midpoint of the bridge arm structure through a branch comprising part of the primary winding, the resonant inductor and the resonant capacitor; or the other end of the first inductor is connected with one end of the primary winding, the connection point is connected with the midpoint of the bridge arm structure through a branch comprising the resonantinductor and the resonant capacitor, and the other end of the primary winding is connected with the first output end of the input rectifier. According to the invention, the LLC working state of the circuit is not affected, the bandwidth of the output voltage loop can be designed to be high, and the power frequency ripple of the secondary output voltage is small.

Description

technical field [0001] The invention relates to the technical field of power circuits, in particular to a single-stage PFC LLC circuit. Background technique [0002] The traditional rectifier bridge electrolytic capacitor circuit will seriously distort the input current waveform, the higher harmonic content is relatively high, and the power factor is very low, which greatly increases the load on the power grid. With the promotion of domestic 3C certification, more and more power supplies need to meet certain harmonic requirements in order to pass the certification in the future. In order to meet this requirement, the traditional method is to adopt a two-stage scheme, that is, PFC+DCDC. Although this scheme can achieve relatively high power factor and low harmonic current, it is very expensive. In order to reduce costs, single-stage PFC technology has been paid more and more attention. [0003] In the prior art, such as figure 1 The common way shown is to realize single-st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M3/335H02M1/42
CPCH02M1/42H02M3/33523H02M7/219H02M1/0058Y02B70/10
Inventor 孙巨禄徐明孙涓涓张志成刘建
Owner 奇普电源(常州)有限公司
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