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Converter having low loss snubber

專利號
US10097081B1
公開日期
2018-10-09
申請人
ACBEL POLYTECH INC.（TW New Taipei）
發(fā)明人
James D. Bucher, II; Alan D. Lauer; Emma C. Trzynka; Jason C. Dehn
IPC分類
H02M1/34; H02M3/335; H02M1/44
技術(shù)領(lǐng)域
winding,wp,capacitor,diode,snubber,ws,voltage,primary,output,first
地域： New Taipei

摘要

The present application is a converter having a low loss snubber. The low loss snubber of the converter includes a clamping winding, a first capacitor, and a second capacitor. The clamping winding is magnetically coupled with a primary winding of a transformer of the converter. The primary winding to a secondary winding of the transformer leakage inductance energy is recovered by storing the energy in the second capacitor. When the second capacitor is discharging, the energy in the second capacitor may be further transferred to the first capacitor. When the first capacitor is discharging, energy in the first capacitor may be further returned to the power source. Therefore, the energy in the first capacitor and the energy in the second capacitor may not be consumed by a resistor, and power consumption of the low loss snubber may be decreased.

說明書

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

In the fifth embodiment of the present invention, a ratio of a number of turns of the clamping winding We and a number of turns of the primary winding Wp is 1:3.

With reference to FIG. 7, in a sixth embodiment of the present invention, the converter may be a flyback converter, and the converter may further include an output diode Dout and an output capacitor Cout.

The output diode Dout is electrically connected between the secondary winding Ws and the first output terminal O/P1. An anode of the output diode Dout is electrically connected to one terminal of the secondary winding Ws, and a cathode of the output diode Dout is electrically connected to the first output terminal O/P1.

The output capacitor Cout is electrically connected between the first output terminal O/P1 and the second output terminal O/P2. In this embodiment, a polarity of the secondary winding Ws is opposite to a polarity of the primary winding Wp.

For clearly explaining a circuit function of the converter of the present invention, a flyback converter is taken for an example. With reference to FIG. 8, a second node n2 is connected by the cathode of the third diode D3 and the first capacitor C1, and a third node n3 is connected by the cathode of the second diode D2 and the second capacitor C2. For example, a voltage of the power source 13 is Vsource, a voltage of the second node n2 is VLC, a voltage of the third node n3 is Vclamp, and a voltage of the first node n1 is V1.

When the switch 12 is turned off, the voltage of the third node n3 Vclamp is calculated by

權(quán)利要求

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