Snubber circuit
US-2016277017-A1 · Sep 22, 2016 · US
Snubber circuit
US2016276923A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016276923-A1 |
| Application number | US-201514970742-A |
| Country | US |
| Kind code | A1 |
| Filing date | Dec 16, 2015 |
| Priority date | Mar 17, 2015 |
| Publication date | Sep 22, 2016 |
| Grant date | — |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
An embodiment of a snubber circuit that absorbs a surge voltage generated in a transformer of a switching power supply, comprises a diode, a zener diode electrically connected to the diode, and a first capacitor electrically connected to the zener diode. The diode, the zener diode, and the first capacitor are serially connected such that, at occurrence of the surge voltage, the diode operates in a forward direction and the first capacitor is charged with the surge voltage via a breakdown voltage of the zener diode, and the diode has reverse recovery time that is longer than a half of a cycle of a ringing voltage generated in a winding of the transformer and is in a range of 125 ns to 7 μs.
First claim
Opening claim text (preview).
What is claimed is: 1 . A snubber circuit that absorbs a surge voltage generated in a transformer of a switching power supply, the snubber circuit comprising: a diode; a zener diode electrically connected to the diode; and a first capacitor electrically connected to the zener diode, wherein the diode, the zener diode, and the first capacitor are serially connected such that, at occurrence of the surge voltage, the diode operates in a forward direction and the first capacitor is charged with the surge voltage via a breakdown voltage of the zener diode, and the diode has reverse recovery time that is longer than a half of a cycle of a ringing voltage generated in a winding of the transformer and is in a range of 125 ns to 7 μs. 2 . The snubber circuit of claim 1 , further comprising a second capacitor connected to the zener diode, a capacitance of the second capacitor being in a range of 100 pF to 1000 pF. 3 . The snubber circuit of claim 2 , wherein a sum of the capacitance of the second capacitor and a junction capacitance of the zener diode is in a range of 400 pF to 1000 pF. 4 . The snubber circuit of claim 2 , wherein a capacitance of the first capacitor is equal to or more than the capacitance of the second capacitor. 5 . The snubber circuit of claim 1 , wherein a junction capacitance of the zener diode is in a range of 100 pF to 1000 pF. 6 . The snubber circuit of claim 1 , further comprising a resistor serially connected to the zener diode, a resistance value of the resistor being in a range of 10Ω to 470Ω. 7 . The snubber circuit of claim 1 , wherein the breakdown voltage of the zener diode is larger than a flyback voltage of a primary winding, the flyback voltage determined based on a turns ratio of the primary winding to a secondary winding of the transformer and an output voltage.
Assignees
Inventors
Classifications
with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence) · CPC title
- H02M1/34Primary
Snubber circuits · CPC title
Passive dissipative snubbers · CPC title
using semiconductor devices only · CPC title
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Frequently asked questions
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- What does patent US2016276923A1 cover?
- An embodiment of a snubber circuit that absorbs a surge voltage generated in a transformer of a switching power supply, comprises a diode, a zener diode electrically connected to the diode, and a first capacitor electrically connected to the zener diode. The diode, the zener diode, and the first capacitor are serially connected such that, at occurrence of the surge voltage, the diode operates i…
- Who is the assignee on this patent?
- Sanken Electric Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H02M1/34. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Sep 22 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).