Browse Prior Art Database

Switch Voltage Regulator

IP.com Disclosure Number: IPCOM000095422D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Menard, EA: AUTHOR [+2]

Abstract

In a voltage regulator circuit, regulation is provided by time ratio controlled line switching using silicon controlled rectifiers SCR. Main SCR connects the unregulated DC input voltage Ein to the load through the filter network L2C2. It is fired from an external source, not shown, at a fixed frequency of, for example, 1.5 K.C. The firing of Commutate SCR, which turns off Main SCR, depends on the output DC voltage level as sensed by appropriate timing control circuitry, not shown.

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Switch Voltage Regulator

In a voltage regulator circuit, regulation is provided by time ratio controlled line switching using silicon controlled rectifiers SCR. Main SCR connects the unregulated DC input voltage Ein to the load through the filter network L2C2. It is fired from an external source, not shown, at a fixed frequency of, for example, 1.5 K.C. The firing of Commutate SCR, which turns off Main SCR, depends on the output DC voltage level as sensed by appropriate timing control circuitry, not shown.

Initially, C1 is uncharged and all SCR's are off. Commutate SCR is turned on through external control circuitry to charge C1 to -Ein through Commutate SCR, L1, C1, L2, C2 and the load. The filter network L2C2 and diode D2 is a standard DC filter configuration.

After the commutate capacitor C1 is charged to -Ein, Main SCR is fired and current flows to the load via L2. Shortly after firing Main SCR, Bleed SCR is fired to allow C1 to reverse its charge to +Ein through L1, Bleed SCR and Main SCR. When the current attempts to reverse, Bleed SCR is turned off. The circuit remains in this state with Main SCR on, Bleed and Commutate SCR off and C1 charged to +Ein, until the latter SCR is again fired. This effectively connects C1 across Main SCR, producing a reverse current that turns Main SCR off. Excess current then flows through diode D1. C1 is charged to -Ein by the ringing action of the L1-C1 combination. When this resonant current attempts to reverse through Commu...