Lossless snubber circuit for use in power converters
First Claim
1. A snubber network for use with a device for converting power from an input voltage source to be supplied to an output load via a first inductor and a first diode, based on a duty cycle of a switching signal supplied to a controllable switch, the snubber network comprising:
- a) a first series connection of an inductor, a diode, and a capacitor;
b) a second series connection of a capacitor and a diode; and
c) a third series connection of a diode and an inductor, the third series connection arranged between the first and second series connection such that the inductor of the third series connection is coupled at a node between the diode and the capacitor of the first series connection and the diode of the third series connection is coupled at a node between the capacitor and the diode of the second series connection.
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Accused Products
Abstract
A switching power converter employing a novel lossless zero-voltage-switching passive snubber network having a power range of up to 5 KW is presented. The passive snubber network improves efficiency, power density, and transient performance, reduces switching losses and EMI, and permits fixed frequency operation of the switching power converter. The passive snubber network also reduces and/or eliminates large peak currents and reverse recovery current spikes normally seen in conventional switching power converters. The proposed passive snubber network may be used in various switching power converter topologies such as boost, buck, balanced, and flyback power converters.
111 Citations
22 Claims
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1. A snubber network for use with a device for converting power from an input voltage source to be supplied to an output load via a first inductor and a first diode, based on a duty cycle of a switching signal supplied to a controllable switch, the snubber network comprising:
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a) a first series connection of an inductor, a diode, and a capacitor; b) a second series connection of a capacitor and a diode; and c) a third series connection of a diode and an inductor, the third series connection arranged between the first and second series connection such that the inductor of the third series connection is coupled at a node between the diode and the capacitor of the first series connection and the diode of the third series connection is coupled at a node between the capacitor and the diode of the second series connection. - View Dependent Claims (2, 11, 12, 13, 14, 18, 19)
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3. In a power conversion circuit which converts an input voltage to an output voltage supplied across a load based on a duty cycle of a switching signal supplied to a controllable switch, and which includes an inductor and a diode arranged in a main current path and a capacitor arranged across the load, a snubber network comprising:
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a) a first series connection of an inductor, a diode, and a capacitor, the first series connection being coupled across the controllable switch of the power conversion circuit; b) a second series connection of a capacitor and a diode, the second series connection being arranged such that the cathode of the diode of the second series connection is coupled with the output voltage; and c) a third series connection of a diode and an inductor, the third series connection arranged between the first and second series connection such that the inductor of the third series connection is coupled at a node between the diode and the capacitor of the first series connection and the diode of the third series connection is coupled at a node between the capacitor and the diode of the second series connection. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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15. In a power conversion circuit which converts an input voltage to an output voltage supplied across a load based on a duty cycle of a switching signal supplied to a controllable switch, and which includes an inductor and a diode arranged in a main current path and a capacitor arranged across the load, a snubber network comprising:
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a) a first series connection of an inductor, a diode, and a capacitor, the first series connection being coupled across the controllable switch of the power conversion circuit; b) a second series connection of a capacitor and a diode, the second series connection being arranged such that the cathode of the diode of the second series connection is coupled with the input voltage; and c) a third series connection of a diode and an inductor, the third series connection arranged between the first and second series connection such that the inductor of the third series connection is coupled at a node between the diode and the capacitor of the first series connection and the diode of the third series connection is coupled at a node between the capacitor and the diode of the second series connection. - View Dependent Claims (16, 17, 20, 21, 22)
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Specification