Circuit and method for producing a flexible reference voltage

Details Circuit and method for producing a flexible reference voltage Circuit and method for producing a flexible reference voltage

1991-06-25

1993-07-20

Stephan, Steven L.

Electricity: power supply or regulation systems

External or operator controlled

Phase controlled switching using electronic tube or a three...

323283, 323350, G05F 146

Patent

active

052297128

ABSTRACT:
A flexible reference voltage circuit includes a circuit for producing a first digital signal representative of a range of reference voltage levels; a circuit for producing a second digital signal representative of a selected reference voltage level within the range of reference voltage levels; an adder for adding the first and second digital signals to produce a third digital signal; and a digital to analog converter for providing an output voltage in response to the third digital signal. The method of producing a flexible reference voltage performed by the circuit is also claimed. The invention can be used with a differential protection circuit to provide a series of trip level ranges, with a series of selectable trip levels in each range. This is accomplished in a high accuracy circuit which is relatively simple to construct, thereby minimizing size and complexity of the current sensor module, in differential protection applications, or the circuitry, if used in a power system controller. Standard digital logic components can be used to perform the necessary range/level decoding.

REFERENCES:
patent: 4087796 (1978-05-01), Brown
patent: 4222048 (1980-09-01), Johnson
patent: 4521764 (1985-06-01), Burton
patent: 4626769 (1986-12-01), Valley et al.
patent: 4761725 (1988-08-01), Henze
patent: 4825143 (1989-04-01), Cheng
patent: 4871961 (1989-10-01), Kersten et al.

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