Power Converter Including a Charge Pump Employable in a Power Adapter
First Claim
Patent Images
1. A charge pump, comprising:
- a voltage divider, including;
a first diode having a terminal coupled to a terminal of a first capacitor, anda second diode having a terminal coupled to a terminal of a second capacitor and another terminal coupled to another terminal of said first capacitor;
a third diode coupled across said second diode and said second capacitor; and
a power switch coupled across said first capacitor and said second diode.
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Abstract
A power converter including a charge pump employable in a power adapter. In one embodiment, the charge pump includes a voltage divider with a first diode having a terminal coupled to a terminal of a first capacitor and a second diode having a terminal coupled to a terminal of a second capacitor and another terminal coupled to another terminal of the first capacitor. The charge pump also includes a third diode coupled across the second diode and the second capacitor, and a charge pump power switch coupled across the first capacitor and the second diode.
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Citations
30 Claims
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1. A charge pump, comprising:
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a voltage divider, including; a first diode having a terminal coupled to a terminal of a first capacitor, and a second diode having a terminal coupled to a terminal of a second capacitor and another terminal coupled to another terminal of said first capacitor; a third diode coupled across said second diode and said second capacitor; and a power switch coupled across said first capacitor and said second diode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of forming a charge pump, comprising:
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providing a voltage divider, including; coupling a terminal of a first diode to a terminal of a first capacitor, coupling a terminal of a second diode to a terminal of a second capacitor, and coupling another terminal of said second diode to another terminal of said first capacitor; coupling a third diode across said second diode and said second capacitor; and coupling a power switch across said first capacitor and said second diode. - View Dependent Claims (12, 13, 14, 15)
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16. A power converter, comprising:
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a transformer including a primary winding, a secondary winding and a bias winding; a power switch coupled to said primary winding; an auxiliary switch coupled to said secondary winding; and a charge pump coupled to said bias winding, comprising; a voltage divider, including; a first diode having a terminal coupled to a terminal of a first capacitor, and a second diode having a terminal coupled to a terminal of a second capacitor and another terminal coupled to another terminal of said first capacitor; a third diode coupled across said second diode and said second capacitor; and a charge pump power switch coupled across said first capacitor and said second diode. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of operating a power converter, comprising:
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providing a transformer including a primary winding, a secondary winding and a bias winding; impressing a voltage across said primary winding from a source of electrical power; rectifying an alternating voltage appearing on said secondary winding; and producing a bias voltage from an alternating voltage appearing on said bias winding with a charge pump, comprising; a voltage divider, including; a first diode having a terminal coupled to a terminal of a first capacitor, and a second diode having a terminal coupled to a terminal of a second capacitor and another terminal coupled to another terminal of said first capacitor; a third diode coupled across said second diode and said second capacitor; and a charge pump power switch coupled across said first capacitor and said second diode. - View Dependent Claims (27, 28, 29, 30)
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Specification