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Converter and control method thereof

A converter and transformer technology, which is applied in the field of flyback converter and its control, can solve the problems of reducing the conversion efficiency of the converter, large turn-off loss of the output rectifier diode, etc., and achieves the effect of strong structural versatility

Inactive Publication Date: 2018-09-14
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the main switching tube is turned on, the leakage inductance of the secondary rectifier diode results in a relatively high reverse voltage value (relative to the steady-state voltage value), resulting in a large turn-off loss of the output rectifier diode, which reduces the converter’s conversion efficiency

Method used

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  • Converter and control method thereof
  • Converter and control method thereof
  • Converter and control method thereof

Examples

Experimental program
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Effect test

no. 1 example

[0045] figure 2 It is a schematic circuit diagram of the first embodiment of the converter for realizing the function of reducing the turn-off loss of the output rectifying diode according to the present invention. The absorption network is connected in parallel with the secondary side of the transformer; the input of the control and drive unit is connected to the output of the converter, one output of the control and drive unit is connected to the primary switch tube of the converter, and the other output of the control and drive unit is connected to the output of the absorption network. The switch tube is connected. Wherein, the absorbing network is composed of a switch tube Q2 and a capacitor C2.

[0046] The connection relationship of the first embodiment of the converter for reducing the turn-off loss of the output rectifying diode in the present invention is as follows:

[0047] The positive pole of the input capacitor C1 is connected to the positive pole of the input...

no. 2 example

[0057] The second example is Figure 9 As shown, the connection relationship is as follows:

[0058] The positive pole of the input capacitor C1 is connected to the positive pole of the input power supply, and connected to one end of the primary side of the transformer T1 and one end of the capacitor C4; the negative pole of the input capacitor C1 is connected to the negative pole of the input power supply, and connected to the source of the switching tube Q1; the transformer The other end of T1 is connected to the drain of the switch tube Q1 and the source of the switch tube Q3; the gate of the switch tube Q1 is connected to the output terminal G1 of the control and drive circuit; the gate of the switch tube Q3 is connected to the output of the control and drive circuit The terminal G3 is connected, the drain of the switch tube Q3 is connected to the other end of the capacitor C4; the anode of the output rectifier diode D1 is connected to the negative pole of the output side,...

no. 3 example

[0062] The third embodiment such as Figure 11 As shown, the flyback topology includes a transformer T1, an input capacitor C1, an output filter capacitor C3, a resistor R1, a diode D1, a diode D2, a diode D3, a main switch Q1 and a switch Q3;

[0063] The positive pole of the input capacitor C1 is connected to the positive pole of the input voltage, and is connected to the drain of the switching tube Q3 and the cathode of the diode D2; the negative pole of the input capacitor C1 is connected to the negative pole of the input voltage, and is connected to the source of the main switching tube Q1, the diode The anode of D3 is connected; the primary terminal of the transformer T1 with the same name is connected with the source of the switch tube Q3 and the cathode of the diode D3; the primary terminal of the transformer T1 with the same name is connected with the drain of the main switch tube Q1 and the anode of the diode D2; The gate of the switch tube Q1 is connected to the fir...

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Abstract

The invention provides a converter and a control method thereof. An absorption network is added to the conventional flyback converter. When a main switch transistor is on, voltage at two ends of a secondary side rectifier diode is clamped at Vin / N + Vo (N is the turn ratio of a primary side to a secondary side of the transformer, Vin is input voltage, and Vo is output voltage), the turn-off loss of the secondary side rectifier diode drops, energy in the absorption network can be used again, and the conversion efficiency of the flyback converter is thus improved.

Description

technical field [0001] The invention relates to a converter and its control method, in particular to a flyback converter and its control method. Background technique [0002] With the advancement of technology, power converters are developing towards high frequency, high efficiency, and high power density. In power converters, especially flyback converters, when operating under hard switching conditions, the switching losses will increase as the frequency rises. In order to improve the efficiency of the converter, it is necessary to reduce the switching loss of the converter. For the output rectifier diode in the flyback converter, when the primary switch is turned on, the theoretical voltage stress it bears is Vin / N+Vo (N is the transformer primary-to-secondary turn ratio N=Np / Ns). However, since there is also leakage inductance on the secondary side of the transformer, the leakage inductance on the secondary side actually resonates with the parasitic capacitance of the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/34
CPCH02M1/34H02M3/33569H02M1/344
Inventor 李永昌吴辉王志燊李斌华
Owner MORNSUN GUANGZHOU SCI & TECH
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