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Patent Searching and Data


Title:
CONTROL CIRCUIT FOR FREE PISTON ENGINE, PARTICULARLY REFRIGERATOR COMPRESSOR
Document Type and Number:
Japanese Patent JPH03195392
Kind Code:
A
Abstract:
PURPOSE: To improve reliability and to reduce cost by controlling the switching of elements at the diagonal parts of an H-type bridge switching element for driving the motor of a compressor while treating current at both side parts using a microprocessor and a differential amplifier. CONSTITUTION: A motor 10 for driving a compressor is connected to an output part 11 that constitutes an H-type bridge with four switching elements 8 and 8'. The motor 10 is driven by turning on or off the switching elements 8 and 8' alternately. At that time, a current that flows to side part wires 4-7 is detected by sensors 23 and 23, is added 25 through an LPF 19, and is inputted to a microprocessor 17, and at the same time a current difference is amplified by a differential amplifier 18. The output of the microprocessor 17 and the differential amplifier 18 is subjected to differential amplification 14, the output is inputted to a PWN modulator via a control circuit 13, and the switching elements 8 and 8' are turned on or off via non-inverted and inverted buffers 9 and 9'.

Inventors:
HAINTSU BUAN DERU BURETSUKU
ENRIKO BASUKOONI
Application Number:
JP30736490A
Publication Date:
August 26, 1991
Filing Date:
November 15, 1990
Export Citation:
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Assignee:
WAARUPUULE INTERNATL BV
International Classes:
F02B71/00; F01B11/00; F04B49/06; F25B9/14; G05D19/02; H02P25/04; H02P27/06; (IPC1-7): F02B71/00; F04B49/06; F25B9/14; H02P7/63