Power adapter employing a power reducer
First Claim
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1. A power adapter, comprising:
- a capacitor coupled to an input of said power adapter;
a bleeder switch coupled in parallel with said capacitor;
a detection circuit configured to sense an ac mains voltage at said input of said power adapter and turn on said bleeder switch upon detection of a loss of said ac mains voltage;
a power converter including a power switch; and
a disconnect switch configured to disconnect said ac mains voltage from said power converter when a signal from a load is a high value.
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Abstract
A power adapter including a power reducer for no-load or light load applications and method of operating the same. In one embodiment, the power adapter includes a capacitor coupled to an input of the power adapter, and a bleeder switch coupled in parallel with the capacitor. The power adapter also includes a detection circuit configured to sense an ac mains voltage at the input of the power adapter and turn on the bleeder switch upon detection of a loss of the ac mains voltage. In addition to or in lieu of, the power adapter may include a power converter, and a disconnect switch configured to disconnect the ac mains voltage from the power converter in response to a signal from a load.
444 Citations
25 Claims
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1. A power adapter, comprising:
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a capacitor coupled to an input of said power adapter; a bleeder switch coupled in parallel with said capacitor; a detection circuit configured to sense an ac mains voltage at said input of said power adapter and turn on said bleeder switch upon detection of a loss of said ac mains voltage; a power converter including a power switch; and a disconnect switch configured to disconnect said ac mains voltage from said power converter when a signal from a load is a high value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power adapter, comprising:
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a rectifier; a power converter coupled to a dc side of said rectifier including a power switch; and a disconnect switch on said dc side of said rectifier configured to disconnect an ac mains voltage from said power converter in response to a signal from a load containing an independent power source, wherein said independent power source provides signal power for circuitry in said power adapter to enable said disconnect. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A method of operating a power adapter including a power converter with a power switch, comprising:
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coupling a capacitor to an input of said power adapter; parallel-coupling a bleeder switch to said capacitor; sensing an ac mains voltage at said input of said power adapter; turning on said bleeder switch upon detection of a loss of said ac mains voltage; and disconnecting said ac mains voltage from said power converter with a disconnect switch when a signal from a load is high. - View Dependent Claims (22, 23, 24, 25)
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Specification