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Subject: Help with a power supply circuit

Date: 04/07/03 at 5:48 PM
Posted by: ramesh
E-mail: prc_209@yahoo.com
Message Posted:

I have a power supply circuit for a device which needs 10000v across it for a specific amount of time[40ms] repetitively. I took a power supply which supplies 10,000v[50uA,0.5W]. I conceived to make this charge a capacitor. There is a switch[like an SCR] between the capacitor and the device to perform switching action. After the capacitor is charged, it is disconnected from the supply and used to charge the device.The discharge time of capacitor is fixed at 40ms. During this time the capacitor supplies the voltage to the device. The resistance of the device is 10Meg.
But I have a problem here. The charging time for the capacitor should be around 25ms and I cannot go for a power supply which generates more current[because I want to save power]. I am not able to conceive this because the voltage droops very fast[less time than 40ms]. I can tolerate a voltage drop upto 3000v, but not less than that.
Can someone suggest me some ideas to overcome my problem? I would appreciate the help.
thanks,
ramesh.

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