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Converter having low loss snubber

專利號(hào)
US10097081B1
公開日期
2018-10-09
申請(qǐng)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
CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority benefit of CN application serial No. 201711248757.2, filed on Dec. 1, 2017. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of specification.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to a converter, and particularly to a converter having a low loss snubber.

2. Description of the Related Art

With reference to FIG. 13, a conventional converter, such as a flyback converter, includes an input terminal I/P, a transformer with a primary winding Wp and a secondary winding Ws, a switch 21, a snubber 22, an output diode Dout, an output capacitor Cout, a first output terminal O/P1, and a second output terminal O/P2. The switch 21 and the primary winding Wp are electrically connected in series, and are electrically connected between the input terminal I/P and a ground. The snubber 22 includes a resistor R, a capacitor C, and a diode D. The resistor R and the capacitor C are electrically connected in parallel, and the resistor R and the capacitor C are electrically connected between a cathode of the diode D and the input terminal I/P. An anode of the diode D is electrically connected to a node connected by the primary winding Wp and the switch 21.

權(quán)利要求

1
What is claimed is:1. A converter having a low loss snubber, comprising:an input terminal;a transformer, comprising a primary winding and a secondary winding;a switch; wherein the switch and the primary winding are electrically connected in series, and are electrically connected between the input terminal and a ground;the low loss snubber, comprising:a first diode; wherein a cathode of the first diode is electrically connected to the input terminal;a first capacitor; wherein the first capacitor is electrically connected between an anode of the first diode and a first node connected by the primary winding and the switch;a second diode;a third diode; wherein a cathode of the third diode is electrically connected to the anode of the first diode;a second capacitor; wherein the second capacitor is electrically connected between a cathode of the second diode and the ground;a first inductor, electrically connected between an anode of the third diode and the cathode of the second diode;a clamping winding; wherein the clamping winding is magnetically coupled with the primary winding, and the clamping winding is electrically connected between the ground and an anode of the second diode;a first output terminal;a second output terminal; wherein the secondary winding is magnetically coupled with the primary winding and the clamping winding, and is electrically connected between the first output terminal and the second output terminal.2. The converter having the low loss snubber as claimed in claim 1, wherein a polarity of the clamping winding is opposite to a polarity of the primary winding.3. The converter having the low loss snubber as claimed in claim 1, wherein the clamping winding is wound with the same number of turns as the primary winding, and is wound bifilar.4. The converter having the low loss snubber as claimed in claim 1, wherein the low loss snubber further comprises:a third capacitor, electrically connected between the anode of the second diode and the first node.5. The converter having the low loss snubber as claimed in claim 1, wherein the low loss snubber further comprises:a first resistor, electrically connected in parallel with the first inductor.6. The converter having the low loss snubber as claimed in claim 1, wherein the switch is a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET);wherein a drain of the MOSFET is the first node, and a source of the MOSFET is electrically connected to the ground.7. The converter having the low loss snubber as claimed in claim 6, further comprising:a npn type bipolar junction transistor (BJT); wherein a collector of the npn type BJT is electrically connected to a collector power source;a pnp type BJT; wherein an emitter of the npn type BJT is electrically connected to an emitter of the pnp type BJT; wherein a collector of the pnp type BJT is electrically connected to the ground; wherein a base of the npn type BJT is electrically connected to a base of the pnp type BJT;a second resistor, configured to be electrically connected between the emitter of the pnp type BJT and a gate of the MOSFET;a driving circuit, configured to comprise an output terminal to output driving signals;a third resistor, configured to be electrically connected between the output terminal of the driving circuit and the base of the pnp type BJT.8. The converter having the low loss snubber as claimed in claim 1, further comprising:a first output diode; wherein an anode of the first output diode is electrically connected to one terminal of the secondary winding;a second output diode; wherein an anode of the second output diode is electrically connected to the other terminal of the secondary winding, and a cathode of the second output diode is electrically connected to a cathode of the first output diode;an output capacitor, configured to be electrically connected between the first output terminal and the second output terminal;an output inductor, configured to be electrically connected between the cathode of the first output diode and the first output terminal;wherein a polarity of the secondary winding is same as a polarity of the primary winding;wherein the clamping winding and the primary winding are in phase.9. The converter having the low loss snubber as claimed in claim 1, further comprising:an output diode, configured to be electrically connected between the secondary winding and the first output terminal; wherein an anode of the output diode is electrically connected to one terminal of the secondary winding, and a cathode of the output diode is electrically connected to the first output terminal; andan output capacitor, configured to be electrically connected between the first output terminal and the second output terminal;wherein a polarity of the secondary winding is opposite to a polarity of the primary winding.
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