Switch circuit to control on/off of a high voltage source

Details Switch circuit to control on/off of a high voltage source Switch circuit to control on/off of a high voltage source

2006-04-07

2010-12-28

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S274000, C323S284000, C323S353000

Reexamination Certificate

active

07859234

ABSTRACT:
A switch circuit to control a high voltage source is presented. It includes a JFET transistor, a resistive device, a first transistor and a second transistor. The JFET transistor is coupled to the high voltage source. The first transistor is connected in serial with the JFET transistor to output a voltage in response to the high voltage source. The second transistor is coupled to control the first transistor and the JFET transistor in response to a control signal. The resistive device is coupled to the JFET transistor and the first transistor to provide a bias voltage to turn on the JFET transistor and the first transistor when the second transistor is turned off. Once the second transistor is turned on, the first transistor is turned off and the JFET transistor is negative biased.

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