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A soft switching boost DC-DC converter and a control method thereof

A technology of DC-DC and converters, which is applied in the field of soft-switching step-up DC-DC converters and its control, which can solve the problems of large switching loss of the main switching device, large volume and high cost of the soft-switching circuit, and achieve improved operation Power, reduce power loss, reduce the effect of heat generation

Inactive Publication Date: 2011-08-31
SUZHOU INST OF INDAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the defects in the above-mentioned prior art, the purpose of the present invention is to propose a soft-switching step-up DC-DC converter and its control method to solve the large switching loss of the main switching device existing in the existing DC-DC converter. The additional soft switching circuit is bulky and expensive

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  • A soft switching boost DC-DC converter and a control method thereof
  • A soft switching boost DC-DC converter and a control method thereof
  • A soft switching boost DC-DC converter and a control method thereof

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Embodiment Construction

[0025] Combine below Figure 3 to Figure 8 The schematic diagram of the converter shown, the schematic flow diagram of the control in one sampling period, and the schematic diagram of the working waveform in one sampling period further illustrate a soft-switching step-up DC-DC converter and its control method of the present invention. image 3 is a structural schematic diagram of an embodiment of the present invention, and its composition includes a filter capacitor C 1 、C 2 、C 3 , filter inductance L 1 , L 2 , switching device S 1 , S 2 , Diode D 1 、D 2 、D 3 , DC voltage detection circuit, drive circuit and controller;

[0026] The filter capacitor C at the input of the converter 1 , connected in parallel with the positive and negative poles of the DC power supply at the input end; the filter inductance L 1 One end of the DC power supply positive pole at the input end of the converter, C 1 one end of the switching device S 2 The power output terminal is connected...

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Abstract

The invention discloses a soft switching boost DC-DC converter and a control method thereof and the soft switching boost DC-DC converter comprises filter capacitors of C1, C2, and C3, filter inductors of L1 and L2, switching elements of S1 and S2, diodes of D1, D2 and D3, a direct voltage detection circuit, a drive circuit and a controller, wherein the inductor L2, the capacitor C2, diode D2 and the switching element S2 form a buffer circuit. The switching element S1 is first started in each sampling period and the soft switching of the switching element S1 of a main power circuit is realized through an auxiliary buffer circuit. The converter in the invention does not need the extra placement of auxiliary elements besides the main power circuit when being applied, thereby effectively reducing the system consumption, volume and cost.

Description

technical field [0001] The invention relates to a soft-switching step-up DC-DC converter and a control method thereof, belonging to the field of electric energy conversion. Background technique [0002] The step-up DC-DC converter adopts high-frequency chopper technology to increase the lower DC voltage to a higher DC voltage, and has been widely used in fuel cells and photovoltaic power generation systems. However, the traditional circuit adopts the working mode of hard switching. During the turn-on and turn-off process of power switching devices and power diodes, large switching losses are generated. Due to the high switching frequency, the system efficiency decreases, which is not conducive to reducing loss and volume. and cost. [0003] The soft switching technology proposed in recent years, that is, by adding an active or passive snubber circuit, the power switching device and power diode of the main circuit are turned on or off at zero voltage and zero current, thereb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCY02B70/1491Y02B70/10
Inventor 卜树坡曹建东章雯钱涛吴冬燕
Owner SUZHOU INST OF INDAL TECH
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