Method and apparatus for a high voltage power supply circuit
First Claim
1. A power supply circuit, comprising:
- a rectifier circuit coupled to receive an AC input voltage;
a switchmode power converter circuit coupled to the rectifier circuit to receive a rectified input voltage to generate a regulated output voltage;
a switch coupled between the rectifier circuit and the switchmode power converter circuit; and
a sense circuit coupled to detect the AC input voltage, wherein sense circuit is coupled to turn off the switch when an absolute value of the AC input voltage exceeds a first threshold value and wherein the sense circuit is coupled to turn on the switch when the absolute value of the AC input voltage is below a second threshold value.
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Abstract
A high voltage power supply method and apparatus is disclosed. An example power supply circuit includes a rectifier circuit coupled to receive an AC input voltage. A switchmode power converter circuit is coupled to the rectifier circuit to receive a rectified input voltage to generate a regulated output voltage. A switch is coupled between the rectifier circuit and the switchmode power converter circuit. A sense circuit is coupled to detect the AC input voltage. The sense circuit is coupled to turn off the switch when an absolute value of the AC input voltage exceeds a first threshold value. The sense circuit is coupled to turn on the switch when the absolute value of the AC input voltage is below a second threshold value.
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Citations
21 Claims
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1. A power supply circuit, comprising:
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a rectifier circuit coupled to receive an AC input voltage; a switchmode power converter circuit coupled to the rectifier circuit to receive a rectified input voltage to generate a regulated output voltage; a switch coupled between the rectifier circuit and the switchmode power converter circuit; and a sense circuit coupled to detect the AC input voltage, wherein sense circuit is coupled to turn off the switch when an absolute value of the AC input voltage exceeds a first threshold value and wherein the sense circuit is coupled to turn on the switch when the absolute value of the AC input voltage is below a second threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification