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Browse Prior Art Database

Time Ratio Switch For Voltage Regulator

IP.com Disclosure Number: IPCOM000095421D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

Menard, EA: AUTHOR [+2]

Abstract

The voltage regulator circuit functions by time ratio operation of silicon controlled rectifiers SCR. Main SCR connects the unregulated DC input voltage Ein to the load through the filter network L3C3. The circuit has a Blead SCR fired at a fixed frequency, a Main SCR fired at a constant time afterwards, and a Commutate SCR fired at a time dependent on the output voltage. All SCR's are connected to external control circuitry, not shown.

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Time Ratio Switch For Voltage Regulator

The voltage regulator circuit functions by time ratio operation of silicon controlled rectifiers SCR. Main SCR connects the unregulated DC input voltage Ein to the load through the filter network L3C3. The circuit has a Blead SCR fired at a fixed frequency, a Main SCR fired at a constant time afterwards, and a Commutate SCR fired at a time dependent on the output voltage. All SCR's are connected to external control circuitry, not shown.

At time zero, a control signal turns Bleed SCR on. No current flows because C2 is not charged. After.a fixed interval, Main SCR is turned on. Current flows to the load and to C2 which rings with L2 and charges to +2Ein. When this current attempts to reverse, it turns Bleed SCR off, leaving C2 charged to +2Ein. Current continues to flow to the load via L3 until the output voltage monitoring control circuitry, not shown, drops the control signal on the Main SCR and turns the Commutate SCR on. This causes the resonant circuit L1C2 to ring. The reverse current through Main SCR turns it off. Diode D1 and Commutate SCR conduct until the current reverses, at which time C2 is charged to -2Ein. All SCR's are off at this time. At a fixed time after time zero, Bleed SCR is again gated on. Capacitor C2 discharges through L2, Bleed SCR and diode D2. Before the current reverses, Main SCR is gated on adding lost energy to the resonant system.

The time interval of Bleed SCR firing to Main SCR firing and the...