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Control method of LCC resonant DC-DC converter and device thereof

A converter control, DC-DC technology, applied in output power conversion devices, control/regulation systems, conversion of DC power input to DC power output, etc. The soft switching range of resonant DC-DC converters is limited, and the effect of reducing voltage and current stress and changing the switching frequency range is achieved.

Pending Publication Date: 2017-11-17
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, considering the complexity of the control circuit implementation, frequency conversion control is widely used in LCC resonant DC-DC converters, but the switching frequency of traditional frequency conversion control varies widely, which seriously increases the difficulty in the design of magnetic components and drive circuits in the converter; on the other hand, the use of The EMI spectrum distribution of the resonant converter controlled by frequency conversion also changes with the switching frequency when the input voltage and output power are different, which also brings difficulties to the design of various EMI filters
Although fixed frequency control eliminates the above problems by ensuring a fixed switching frequency, the soft switching range of LCC resonant DC-DC converters is severely limited and increases the voltage and current stress of each component, so it has not been widely used

Method used

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  • Control method of LCC resonant DC-DC converter and device thereof
  • Control method of LCC resonant DC-DC converter and device thereof
  • Control method of LCC resonant DC-DC converter and device thereof

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Embodiment Construction

[0021] Hereinafter, the present invention will be further described in detail through specific examples in conjunction with the drawings.

[0022] figure 1 It is a block diagram of the system structure of the present invention, which includes an output voltage sampling circuit 100, an error amplifier circuit 200, a first modulation circuit 310, a second modulation circuit 320, and a switch drive circuit 400. Furthermore, the output voltage sampling circuit 100 collects the output voltage and generates an output signal v o To the error amplifier circuit 200; the error amplifier circuit 200 passes v o And internal reference voltage V ref Perform error amplification and output error signal v e To the first modulation circuit 310 and the second modulation circuit 320; the first modulation circuit 310 outputs the first modulation signal v saw1 To the second modulation circuit 320; the second modulation circuit 320 outputs the second modulation signal v saw2 Compared with the result v...

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Abstract

The present discloses a control method of a LCC resonant DC-DC converter and a device thereof, used for controlling the LCC resonant DC-DC converter to realize zero-voltage soft switching operation in a wide input voltage range and a wide load range. According to the control method, by circuits controlling turn-on time and turn-off time of switch tubes of the LCC resonant DC-DC converter, the turn-on time and the turn-off time of the switch tubes vary with an input voltage and a load. The turn-on time and the turn-off time of the switch tubes are determined by an error value between an output voltage and a reference signal. Because a resonant current can not have an abrupt change, when any switch tube turns off, a body diode of the other switch tube immediately turns on, so that the switch tubes all work in a zero-voltage soft switching state. The control method of the LCC resonant DC-DC converter and the device thereof can reduce a switching frequency variation range of the conventional LCC resonant DC-DC converter and maintain the zero-voltage soft switching operation condition of the LCC resonant DC-DC converter in the wide input voltage range and the wide load range.

Description

Technical field [0001] The invention relates to a control method and device of an LCC resonant DC-DC converter. Background technique [0002] In recent years, power electronics technology has developed rapidly, and power technology, as an important part of the power electronics field, has gradually become a hotspot of application and research. Switching converters have established their mainstream status in the power supply field with their high efficiency and high power density. With the continuous improvement of industry requirements, switching power supplies have been developing in the direction of miniaturization, modularization and high frequency. Resonant converters have received extensive attention from industry and academia because of their good soft switching characteristics and low EMI interference. In the traditional two-element resonant converter, the series resonant converter has poor light-load voltage regulation capability, and the parallel resonant converter has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/337
CPCH02M3/3376H02M1/0058Y02B70/10
Inventor 许建平陈一鸣沙金钟曙林磊明
Owner SOUTHWEST JIAOTONG UNIV
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