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High Frequency SCR Inverter DC Regulator

IP.com Disclosure Number: IPCOM000076118D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Youn, R: AUTHOR

Abstract

This High-Frequency (20KHz) Silicon-Controlled Rectifier (SCR) Inverter DC Regulator provides a variable SCR triggering frequency to control the off-time (dead zone) of the inverter output, thereby maintaining a regulated DC output. The SCR switching is done by impulse commutation through a series L-C circuit.

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High Frequency SCR Inverter DC Regulator

This High-Frequency (20KHz) Silicon-Controlled Rectifier (SCR) Inverter DC Regulator provides a variable SCR triggering frequency to control the off-time (dead zone) of the inverter output, thereby maintaining a regulated DC output. The SCR switching is done by impulse commutation through a series L-C circuit.

The SCR switching regulator offers several advantages over the existing regulators, in that the total elimination of the bulky 60 Hz or 400 Hz transformer and the use of only two SCR's provides a more compact, much lighter and less costly unit for a given output wattage rating. It also appears to have a definite cost advantage over the transistor switching regulator for output power higher than 1 Kwatt.

Fig. 1 shows a SCR inverter circuit 11 and a SCR control circuit 12. The SCR switching is done by complementing impulse commutation through a series L-C circuit 14. Actually, the turn-on of SCR 1 causes the turn-off of SCR 2 and vice versa. The variable-triggering frequency f from the SCR control circuit 12 controls the extent of the dead zone of the inverter output V(p). The dead zone and the relationship between the waveforms of V(p) and V(out) is shown in Fig.
2.

Since the extent of the dead zone (SCR turn-off time during operation) is determined by the L-C resonant frequency f(r) and the SCR triggering frequency f(t), selection of f(r) = 2f(t) will introduce an adequate dead zone to cover a rather wide range of li...