Computer system including power supply circuit with controlled output power
First Claim
Patent Images
1. A computer system comprising:
- a computer system unit;
a power supply circuit coupled to receive input power and generate output power, the power supply circuit including a circuit to generate a control signal related to the power level of the input power, the control signal having a first value relative to an input signal if the input signal level exceeds a selected threshold level and the control signal having a second value relative to the input signal if the input signal level does not exceed the selected threshold level, wherein the power level of the output power is controlled so that it does not exceed a maximum power level which is based on the level of the control signal; and
a plurality of power-consuming elements housed within the computer system unit, the power consuming elements being powered by the output power from the power supply circuit;
wherein the power supply circuit comprises;
a rectifier;
a current detector with an input coupled to the rectifier;
a voltage detector with an input coupled to the rectifier;
a divider circuit with an input coupled to an output of the voltage detector;
a multiplier with a first input coupled to an output of the divider circuit and a second input coupled to an output of the current detector;
a comparator with an input coupled to an output of the multiplier; and
an AC-DC converter with a signal input coupled to the rectifier and a control input coupled to an output of the comparator.
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Abstract
A computer system includes a computer system unit and a power supply circuit. The power supply circuit is coupled to receive input power and generate output power. This circuit includes a circuit to generate a control signal that is related to the power level of the input power. The control signal has a first value relative to the input signal if the input signal exceeds a selected threshold level and the control signal has a second value relative to the input signal if the input signal does not exceed the selective threshold value. The power level of the output power is controlled so that it does not exceed a maximum power level which is based on the level of the control signal.
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Citations
15 Claims
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1. A computer system comprising:
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a computer system unit; a power supply circuit coupled to receive input power and generate output power, the power supply circuit including a circuit to generate a control signal related to the power level of the input power, the control signal having a first value relative to an input signal if the input signal level exceeds a selected threshold level and the control signal having a second value relative to the input signal if the input signal level does not exceed the selected threshold level, wherein the power level of the output power is controlled so that it does not exceed a maximum power level which is based on the level of the control signal; and a plurality of power-consuming elements housed within the computer system unit, the power consuming elements being powered by the output power from the power supply circuit; wherein the power supply circuit comprises; a rectifier; a current detector with an input coupled to the rectifier; a voltage detector with an input coupled to the rectifier; a divider circuit with an input coupled to an output of the voltage detector; a multiplier with a first input coupled to an output of the divider circuit and a second input coupled to an output of the current detector; a comparator with an input coupled to an output of the multiplier; and an AC-DC converter with a signal input coupled to the rectifier and a control input coupled to an output of the comparator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power supply circuit comprising:
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an input terminal to receive an input signal; a circuit to generate a control signal, the ratio of the input signal to the control signal having a first value if the level of the input signal exceeds a selected threshold level and the ratio of the input signal to the control signal having a second value if the level of the input signal does not exceed the selected threshold level; and an output terminal to provide an output signal, wherein the power level of the output signal is controlled so that it does not exceed a maximum power level which is based on the level of the control signal; wherein the circuit comprises; a first resistor with a first terminal coupled to a circuit input terminal; a second resistor with a first terminal coupled to a second terminal of the first resistor, the second resistor having a second terminal coupled to a reference voltage node; a third resistor selectively coupled in parallel with the second resistor depending upon whether or not the input signal voltage exceeds a selected threshold voltage level. - View Dependent Claims (10, 11, 12)
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13. A power supply circuit comprising:
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a rectifier; a current detector with an input coupled to the rectifier; a voltage detector with an input coupled to the rectifier; a voltage divider with an input coupled to an output of the voltage detector, the voltage divider including a switch which is activated when the voltage level at the input exceeds a threshold voltage level; a multiplier with a first input coupled to an output of the voltage divider and a second input coupled to an output of the current detector; a comparator with an input coupled to an output of the multiplier; and an AC-DC converter with a signal input coupled to the rectifier and a control input coupled to an output of the comparator. - View Dependent Claims (14, 15)
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Specification