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Active Low Dissipation Power Supply Regulator

IP.com Disclosure Number: IPCOM000090970D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Farber, S: AUTHOR

Abstract

This power supply regulator is useful for controlling under-voltage due to positive transients in load current. Previously used shunt regulators function well in controlling over-voltage problems, but they are limited in the amount of current which they can supply to overcome under-voltage conditions. To regulate against substantial negative transients in load current, shunt regulators have to dissipate substantial power in the steady state.

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Active Low Dissipation Power Supply Regulator

This power supply regulator is useful for controlling under-voltage due to positive transients in load current. Previously used shunt regulators function well in controlling over-voltage problems, but they are limited in the amount of current which they can supply to overcome under-voltage conditions. To regulate against substantial negative transients in load current, shunt regulators have to dissipate substantial power in the steady state.

The regulator utilizes a voltage comparator in conjunction with two shunt capacitors C. Under the quiescent condition, capacitors C charge to the power supply voltage through resistors R. When a load voltage decrease is sensed by the voltage comparator, transistor T is made conductive by the control level and capacitors C are discharged into the load. The total charge which can be usefully drawn from the capacitors is increased greatly by this circuit. Further, the allowed drop in the series equivalent resistance and inductance of the capacitors can be increased greatly. Thus, the size of the capacitors can be significantly reduced in comparison with prior capacitance regulators.

If a shunt regulator is used to control over-voltage, the same voltage comparator is used to control it. An alternative is to replace resistors R by transistors which control the charging of capacitors C and function as shunt regulators.

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