Method and apparatus for a high voltage power supply circuit
First Claim
1. A power supply circuit, comprising:
- a rectifier circuit coupled to input terminals of the power supply circuit to be 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 in response to the rectified input 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 the switch is coupled to be switched in response to the sense circuit, wherein the switch is coupled to be switched off when an absolute value of the AC input voltage exceeds a first threshold value and wherein the switch is coupled to be switched on when the absolute value of the AC input voltage is below a second threshold value.
1 Assignment
0 Petitions
Accused Products
Abstract
A high voltage power supply method and apparatus is disclosed. An apparatus according to aspects of the present invention includes a power supply circuit having a rectifier circuit coupled to input terminals of the power supply circuit that are to be 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 in response to the rectified input 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 switch is coupled to be switched in response to the sense circuit. The switch is coupled to be switched off when an absolute value of the AC input voltage exceeds a first threshold value. The switch is coupled to be switched on when the absolute value of the AC input voltage is below a second threshold value.
-
Citations
32 Claims
-
1. A power supply circuit, comprising:
-
a rectifier circuit coupled to input terminals of the power supply circuit to be 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 in response to the rectified input 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 the switch is coupled to be switched in response to the sense circuit, wherein the switch is coupled to be switched off when an absolute value of the AC input voltage exceeds a first threshold value and wherein the switch is coupled to be switched on 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)
-
-
22. A method of regulating a power supply, comprising:
-
rectifying an AC input voltage received at input terminals of a power supply circuit with a rectifier circuit; generating a regulated output voltage at output terminals of the power supply circuit with a switchmode power converter circuit coupled to receive a rectified input voltage from the rectifier circuit; switching off a switch coupled between the rectifier circuit and the switchmode power converter circuit when an absolute value of the AC input voltage exceeds a first threshold value; and switching on the switch coupled between the rectifier circuit and the switchmode power converter circuit when the absolute value of the AC input voltage is below a second threshold value. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
Specification