Zero voltage conversion CLL resonance DC-DC converter and control method thereof

A DC-DC, converter technology, applied in the field of zero-voltage conversion CLL resonant DC-DC converter and its control, can solve the problems of insufficient light-load efficiency of LCC converters, and it is difficult to effectively utilize the parasitic elements of the transformer, etc. Achieve high-efficiency operation, low power, and reduce switching losses

Inactive Publication Date: 2020-01-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the improvement of the light-load efficiency of the LCC converter is still not enough
Efficiency is improved by changing the switching frequency, this variable frequency control creates EMI and issues related to filter and magnetic design, and it is difficult to effectively use the parasitic elements of the transformer

Method used

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  • Zero voltage conversion CLL resonance DC-DC converter and control method thereof
  • Zero voltage conversion CLL resonance DC-DC converter and control method thereof
  • Zero voltage conversion CLL resonance DC-DC converter and control method thereof

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Embodiment Construction

[0021] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] Such as figure 1 Shown is the circuit diagram of the ZVT CLL resonant DC-DC converter of the present invention; comprising: a DC power supply (1), a full-bridge HF converter (2), a ZVT auxiliary circuit for zero-voltage conversion (3), and a CLL resonant circuit (4) , isolation transformer (5), diode rectifier circuit (6), energy storage circuit (7), load (8);

[0023] The full-bridge high-frequency HF converter includes four MOSFET tubes S 1 , S 2 , S 3 , S 4 , each MOSFET tube is connected in parallel with a snubber capacitor C n ;

[0024] The ZVT auxiliary circuit is installed between the bridge arms of the HF converter, and the DC input can be powered by the renewable energy V s provided, the auxiliary capacitor C z with MOSFETs S a Parallel, diode D 1z with auxiliary inductance L z connected in series to S 1 , S 4 B...

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Abstract

The invention discloses a zero voltage conversion CLL resonance DC-DC converter. The converter comprises a full-bridge HF converter, a zero voltage conversion ZVT auxiliary circuit, a CLL resonance circuit, an isolation transformer, a diode rectification circuit, an energy storage filter circuit and a load, wherein the ZVT auxiliary circuit comprises an absorption capacitor, an MOFET tube, an auxiliary inductor and an auxiliary diode, the CLL resonance circuit comprises a capacitor Cs and inductors Lr and Lt and is bridged between output ports A and B of the HF converter, a two-winding high-frequency transformer is arranged between the capacitor energy storage filter circuit and the diode rectifier bridge, and the rectification circuit supplies power to a load through output filtering. Thezero voltage conversion CLL resonance DC-DC converter is advantaged in that the ZVT auxiliary circuit and the CLL resonance circuit can effectively reduce the switching loss, so efficiency of the converter is improved, the operation time interval and the consumed power are made to be smaller, and overall operation optimization of the converter is realized.

Description

technical field [0001] The invention relates to a zero-voltage switching CLL resonant DC-DC converter and a control method thereof, belonging to the technical field of power electronic soft switching. Background technique [0002] Renewable energy has always been the most promising alternative to traditional energy sources. The power generated by using renewable energy fluctuates greatly. To convert this varying power into usable constant power requires a power conditioning unit. The DC-DC converter is one of the most important components of this power conditioning unit. Due to hard switching, a pulse width modulated (Pulse width modulated, PWM) DC-DC converter for adjusting output power will cause large switching losses. With high switching frequencies, these switching losses increase significantly, resulting in reduced efficiency. To overcome this shortcoming, various DC-DC resonant converter topologies have been proposed in the literature. The resonant converter includ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33569H02M1/0058Y02B70/10
Inventor 陈景文周光荣
Owner SHAANXI UNIV OF SCI & TECH
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