Browse Prior Art Database

Switchable High Voltage Supply

IP.com Disclosure Number: IPCOM000090413D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Greeson, JC: AUTHOR [+3]

Abstract

When a capacitive load is to be driven by a high-voltage supply having a limited maximum current output, the current requirements for switching the load between low and high potential levels can exceed the current capacity of the supply. This circuit provides a parallel source of current for charging the load and a parallel current sink for discharging it. Switchable supply 10 is connected by bus 12 to load 14 and is under the control of input A to deliver a potential V which varies between a low level V1 and a high level V2. Auxiliary supply 16 is provided which supplies a continuous potential level V3, greater than V2, to its output 18. This output is delivered through current limiting resistor R1 to charge capacitor C1 and to maintain bus 20 normally at V3.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 68% of the total text.

Page 1 of 2

Switchable High Voltage Supply

When a capacitive load is to be driven by a high-voltage supply having a limited maximum current output, the current requirements for switching the load between low and high potential levels can exceed the current capacity of the supply. This circuit provides a parallel source of current for charging the load and a parallel current sink for discharging it. Switchable supply 10 is connected by bus 12 to load 14 and is under the control of input A to deliver a potential V which varies between a low level V1 and a high level V2. Auxiliary supply 16 is provided which supplies a continuous potential level V3, greater than V2, to its output 18. This output is delivered through current limiting resistor R1 to charge capacitor C1 and to maintain bus 20 normally at V3. Bus 20 is connected through a triggerable spark gap TG1 via line 22 to bus 12 and to load 14 in parallel with the supply 10.

At time T1, supply 10 is switched from V1 to V2. At the same time, control pulse C triggers gap TG1 to deliver energy via bus 20 and line 22 from C1 to load 14 in parallel with the output of supply 10. The capacity of C1 is matched to that of CL in such manner that the spark across gap TG1 extinguishes as the potential level across the load arrives at V2. Then the V2 level on bus 12 is maintained by supply 10, which can furnish sufficient current to offset the DC drain through RL.

For switching load 14 to its lower potential level V1 again, an energy sin...