Browse Prior Art Database

Driven Inverter Power Supply

IP.com Disclosure Number: IPCOM000087587D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Phillips, DW: AUTHOR [+3]

Abstract

An inverter power supply is driven at a submultiple of a switching circuit which is connected to the supply so that the power supply ripple spike is hidden during the transition of the switching circuit.

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Driven Inverter Power Supply

An inverter power supply is driven at a submultiple of a switching circuit which is connected to the supply so that the power supply ripple spike is hidden during the transition of the switching circuit.

The power supply comprises a DC-to-DC converter 11 which employs an inverter and a drive circuit 13 which drives the inverter at a submultiple of the frequency of the output switching circuit (not shown). The frequency of the drive circuit is greater than the free-running frequency of the inverter but less than two times the free-running frequency of the inverter. Switching transistors 15 and 17 are each responsive to the drive circuit. The drive circuit causes transistor 15 to turn off prior to saturation of transformer 19. This reverses the flux field in the transformer, turning on switching transistor 17 which is later turned off by drive circuit 13.

This operation reduces the transient power in the switching transistors. It also controls the placement of the ripple spike on the output of the power supply so that it occurs simultaneously with the transition time of the switching circuit connected to output terminal 21. This is because the frequency of the input signal applied to terminal 23 of the drive circuit 13 is a submultiple of the frequency of the switching circuit located at the output 21 of the power supply.

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