Power converter with bias voltage regulation circuit
First Claim
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1. A power conversion circuit, comprising:
- a voltage boost circuit configured to generate an output voltage in response to an input voltage;
a boost controller configured to control operation of the voltage boost circuit in response to a bias voltage; and
a bias voltage generation circuit configured to generate the bias voltage, wherein the bias voltage generation circuit is configured to regulate a level of the bias voltage in response to a level of the input voltage;
wherein the bias voltage generation circuit is configured to detect the level of the input voltage and to increase the level of the bias voltage in response to detecting that the input voltage is below a threshold voltage level.
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Abstract
A power conversion circuit includes a voltage boost circuit configured to generate an output voltage in response to an input voltage, a boost controller configured to control operation of the voltage boost circuit, and a bias voltage generation circuit configured to generate a bias voltage. The bias generation circuit is configured to regulate a level of the bias voltage in response to a level of the input voltage.
55 Citations
21 Claims
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1. A power conversion circuit, comprising:
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a voltage boost circuit configured to generate an output voltage in response to an input voltage; a boost controller configured to control operation of the voltage boost circuit in response to a bias voltage; and a bias voltage generation circuit configured to generate the bias voltage, wherein the bias voltage generation circuit is configured to regulate a level of the bias voltage in response to a level of the input voltage; wherein the bias voltage generation circuit is configured to detect the level of the input voltage and to increase the level of the bias voltage in response to detecting that the input voltage is below a threshold voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power conversion circuit, comprising:
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a voltage boost circuit configured to generate an output voltage in response to a rectified input voltage signal, the voltage boost circuit including a first energy storage element; a boost controller configured to control operation of the voltage boost circuit; and a bias voltage generation circuit configured to generate a bias voltage for operating the boost controller, wherein the bias voltage generation circuit comprises a second energy storage element, and wherein the bias voltage generation circuit is configured to transfer energy from the first energy storage element to the second energy storage element in response to a level of the rectified input voltage signal being below a threshold voltage level.
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10. A method of operating a power conversion circuit, comprising:
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generating an output voltage in response to an input voltage; generating a bias voltage for powering a control circuit; regulating a level of the bias voltage in response to a level of the input voltage; detecting the level of the input voltage; and increasing the level of the bias voltage in response to detecting that the input voltage is below a threshold voltage level. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A power conversion circuit, comprising:
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a voltage boost circuit configured to generate an output voltage in response to an input voltage, wherein the voltage boost circuit includes a cascade switch including a high voltage switch and a control switch wherein the high voltage switch comprises an enhancement mode MOSFET; a boost controller configured to control operation of the control switch; and a bias voltage generation circuit coupled to a gate and to a source of the high voltage switch, wherein the bias voltage generation circuit is configured to provide a first gate voltage to the gate of the high voltage switch that is sufficient to turn on the high voltage switch when the control switch is in an ON state; a gate bias circuit coupled to the gate of the high voltage switch and to an output terminal of the voltage boost circuit, wherein the gate bias circuit is configured to provide a second gate voltage to the gate of the high voltage switch that is higher than the first gate voltage. - View Dependent Claims (19, 20, 21)
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Specification