Electricity: power supply or regulation systems – Remote sensing
Patent
1976-07-06
1978-01-31
Goldberg, Gerald
Electricity: power supply or regulation systems
Remote sensing
323 75N, 324DIG1, G01R 1710
Patent
active
040718140
ABSTRACT:
A circuit for controlling two single (or one combined), oppositely directed controlling agents which operate on some controllable parameter, such as temperature, in a manner whereby the parameter is maintained within a prescribed narrow range or deadband, such that the parameter is free to drift within the two boundaries of the deadband but in which it actuates the appropriate controlling agent at or near either boundary to prevent the parameter from drifting appreciably beyond the deadband. Central to the method is a modification of a Wheatstone bridge in which a fifth arm is added to the four which normally compose a bridge, thereby enabling the bridge to generate two separate output signals. The fifth arm is a small, single resistor, preferably variable, placed in series with and between two normally adjacent legs of a bridge. The two output signals thus formed, after being suitably transformed by comparators or preamplifiers, then amplified and applied respectively to the appropriately directed controlling agents, then define the upper and lower boundaries of the controlling deadband. The width, or range, of the deadband is proportional to the resistance of the fifth arm of the bridge.
REFERENCES:
patent: 2759150 (1956-08-01), Rosenbaum
patent: 3161821 (1964-12-01), Price et al.
patent: 3439258 (1969-04-01), Van Leeuwen
patent: 3800592 (1974-04-01), Jones, Jr.
Instruments & Control Systems, Feb. 1967, p. 75.
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