发明名称 |
WASHING MACHINE MOTOR SPEED CONTROL CIRCUIT |
摘要 |
In washing machine control circuits of the type in which a semiconductor controlled rectifier SCR is arranged in series with the motor M in order to control the speed of the motor, a short circuit fault of the SCR can result in damage to the machine. A bistable device BD is reset at each zero crossing of the applied mains voltage and is set in each half cycle only if the voltage across the SCR reaches a level which cannot be reached if the SCR is short-circuited. A logic circuit LOG detects any non-setting of the bistable device for three or more consecutive half cycles of the same or alternating polarity and responds thereto by disconnecting the supply to the motor (contact R1). |
申请公布号 |
DE3370908(D1) |
申请公布日期 |
1987.05.14 |
申请号 |
DE19833370908 |
申请日期 |
1983.07.28 |
申请人 |
PHILIPS ELECTRONIC AND ASSOCIATED INDUSTRIES LIMITED;N.V. PHILIPS' GLOEILAMPENFABRIEKEN |
发明人 |
SETH, SIYA VALLABH |
分类号 |
H02H7/08;H02P25/10;(IPC1-7):H02H7/08;H02H7/12 |
主分类号 |
H02H7/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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