Power control system startup method and circuit
First Claim
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1. A power control system startup method comprising:
- coupling a high voltage device to receive an input voltage and responsively generate a bias current and couple the bias current to an output transistor of the high voltage device;
coupling a switch element to shunt the bias current away from the output transistor when an output voltage is less than a first value; and
coupling the output transistor of the high voltage device to generate an output current that is greater than the bias current when the output voltage is greater than the first value.
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Abstract
A power control system uses two separate currents to control a startup operation of the power control system. One of the currents has a small value and is used to charge an output voltage to an initial value. Once the initial value is reached, a second current that has a large value is used to charge the output voltage to an operating voltage value.
10 Citations
20 Claims
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1. A power control system startup method comprising:
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coupling a high voltage device to receive an input voltage and responsively generate a bias current and couple the bias current to an output transistor of the high voltage device;
coupling a switch element to shunt the bias current away from the output transistor when an output voltage is less than a first value; and
coupling the output transistor of the high voltage device to generate an output current that is greater than the bias current when the output voltage is greater than the first value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power control system startup method comprising:
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receiving an input voltage;
generating a first current from the input voltage;
shunting the first current to an output of a startup circuit;
using the first current to form an output voltage at the output; and
using a second current to form the output voltage when the output voltage is greater than a first value wherein the second current is greater than the first current. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A power control system method comprising:
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generating a first output current at an output of a startup circuit responsively to a first value of an output voltage; and
coupling the output to a voltage return to disable the output voltage. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification