Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1986-03-21
1987-09-15
Roskoski, Bernard
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318599, 318471, 318472, 318473, 366145, 62227, F25B 100, H02P 526
Patent
active
046942289
ABSTRACT:
A closed-loop, temperature-controlled cooling system includes a Stirling cycle refrigerator driven by a dc motor, wherein the motor excitation derives from pulse width modulation. Temperature control of the cooling system is provided by a temperature-sensitive bridge circuit which responds to variations in temperature by generating an error voltage which effects a change in the modulator duty cycle. The amount of cooling is directly related to the average voltage applied to the motor, which is a function of the modulator duty cycle and the amplitude of the supply voltage. A compensation circuit is disclosed which responds to variations in the voltage amplitude of an unregulated supply by coupling an error signal to the bridge circuit to thereby affect the modulator duty cycle.
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Berard Jr. Clement A.
Ip Shik Luen Paul
Maginniss Christopher L.
Meise William H.
RCA Corporation
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