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Startup circuit, switching power source IC, and switching power source apparatus
US8934271B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8934271-B2 |
| Application number | US-201113329909-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 19, 2011 |
| Priority date | Dec 24, 2010 |
| Publication date | Jan 13, 2015 |
| Grant date | Jan 13, 2015 |
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Abstract
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A startup circuit includes a MOSFET that is connected between a startup power source and an auxiliary power source made of a smoothing capacitor and passes a startup current from the startup power source to the smoothing capacitor, a JFET that has a drain terminal connected to a drain terminal of the MOSFET and a source terminal connected through a resistor to a gate terminal of the MOSFET, and a pinch-off voltage controller that controls a pinch-off voltage of the JFET to a first reference voltage at startup and to a second reference voltage, which is lower than the first reference voltage, after startup.
First claim
Opening claim text (preview).
What is claimed is: 1. A startup circuit comprising: a MOSFET being connected between a startup power source and an auxiliary power source of a capacitance element and configured to pass a startup current of the startup power source to the capacitance element; a JFET having a drain terminal connected to a drain terminal of the MOSFET and a source terminal connected through a resistor to a gate terminal of the MOSFET; and a pinch-off voltage controller configured to control a p…
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Cross-Sectional Technologies · mapped topic
- H02M1/36Primary
Electricity · mapped topic
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Frequently asked questions
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- What does patent US8934271B2 cover?
- A startup circuit includes a MOSFET that is connected between a startup power source and an auxiliary power source made of a smoothing capacitor and passes a startup current from the startup power source to the smoothing capacitor, a JFET that has a drain terminal connected to a drain terminal of the MOSFET and a source terminal connected through a resistor to a gate terminal of the MOSFET, and…
- Who is the assignee on this patent?
- Kubota Hideyuki, Kondou Satoshi, Sanken Electric Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H02M1/36. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jan 13 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).