Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...
Patent
1990-11-13
1992-01-14
Wayner, William E.
Refrigeration
Gas compression, heat regeneration and expansion, e.g.,...
60520, 62230, F25B 900
Patent
active
050799240
ABSTRACT:
A circuit for controlling a free-piston engine, particularly of a refrigerator compressor, includes a bridge circuit part (1) of H configuration, in the sides (4, 5, 6, 7) of which there are positioned electronically controlled switching elements (8). The part of H configuration (1) is connected to an engine (10). A microprocessor (17) is provided to control the opening and closure of the electronic switching elements in accordance with the measurement of the mains power absorbed by the engine. The circuit provides elements (23, 25) for measuring the absorbed mains current traversing the diagonals (4, 7; 5, 6) of the H part (1), said current being proportional to the mains power absorbed by the engine (10). The elements (25) feeds a signal to the microprocessor which, on the basis of this signal, generates a further signal which, by comparison with a value equal to the current actually absorbed by the engine, enables the electronic switching elements (8) to be controlled.
REFERENCES:
patent: 4567726 (1986-02-01), Vitale et al.
patent: 4902952 (1990-02-01), Lavery
patent: 5018357 (1991-05-01), Livingstone et al.
Van Der Broeck Heinz
Vasconi Enrico
Franzblau Bernard
Wayner William E.
Whirlpool International B.V.
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