POWER SUPPLY WITH VOLTAGE OUTPUT RESPONSIVE TO LOAD DEMAND
First Claim
1. A power adapter, comprising:
- a rectifier and filter configured to be coupled to an input alternating current (AC) source and to generate a direct current (DC) transformer input signal;
a transformer, the transformer comprising a primary winding coupled to the transformer input signal and a secondary winding coupled to an output of the power adapter;
a current sensor configured to sense an output current drawn at the output of the power adapter and to generate a current sense signal; and
a controller configured to a) regulate a voltage at the output of the power adapter by controlling current flowing through the primary winding of the transformer and b) select an output voltage from at least a first voltage and a second voltage based upon the current sense signal.
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Accused Products
Abstract
A method for a power adapter to selectively provide a first and a second output voltage may comprise coupling a rectified and filtered transformer input signal to a primary winding of a transformer. The secondary winding thereof may comprise a first tap associated with the first output voltage and a second tap associated with the second output voltage, the first and second taps being configured to be selectively coupled to and uncoupled from an output of the power adapter. The output current drawn at the output of the power adapter may then be sensed. When the sensed output current is determined to have exceeded a predetermined threshold, the output of the power adapter may be switched from the first to the second tap by uncoupling the first tap from the output of the power adapter and coupling the second tap to the output of the power adapter.
24 Citations
22 Claims
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1. A power adapter, comprising:
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a rectifier and filter configured to be coupled to an input alternating current (AC) source and to generate a direct current (DC) transformer input signal; a transformer, the transformer comprising a primary winding coupled to the transformer input signal and a secondary winding coupled to an output of the power adapter; a current sensor configured to sense an output current drawn at the output of the power adapter and to generate a current sense signal; and a controller configured to a) regulate a voltage at the output of the power adapter by controlling current flowing through the primary winding of the transformer and b) select an output voltage from at least a first voltage and a second voltage based upon the current sense signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for a power adapter to selectively provide a first and a second output voltage, comprising:
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coupling an input signal to a primary winding of a transformer, a secondary winding thereof comprising a first tap associated with the first output voltage and a second tap associated with the second output voltage, each of the first and second taps being configured to be selectively coupled to and uncoupled from an output of the power adapter; sensing an output current drawn at the output of the power adapter; determining when the sensed output current exceeds a predetermined threshold; and switching the output of the power adapter from the first to the second tap of the transformer by uncoupling the first tap from the output of the power adapter and coupling the second tap to the output of the power adapter when the sensed output current is determined to have exceeded the predetermined threshold. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of selectively providing a standby voltage or an operating voltage to an electronic device, comprising:
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coupling a rectified and filtered transformer input signal to a primary winding of a transformer, a secondary winding thereof comprising a first tap associated with the standby voltage and a second tap associated with the operating voltage, each of the first and second taps being configured to be selectively coupled to and uncoupled from the electronic device; sensing a current drawn by the electronic device; determining when the sensed current exceeds a predetermined threshold that is indicative of the electronic device switching from a standby state to an operating state; and switching from providing the standby voltage to providing the operating voltage by uncoupling the first tap from the electronic device and coupling the second tap to the electronic device when the sensed output current is determined to have exceeded the predetermined threshold. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification