发明授权
- 专利标题： Interface circuit for low power drain microprocessor-based thermostat
- 专利标题（中）： 低功耗微处理器温控器接口电路
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申请号： US765855申请日： 1991-09-26
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公开(公告)号： US5192874A公开(公告)日： 1993-03-09
- 发明人: John T. Adams
- 申请人： John T. Adams
- 专利权人： Honeywell, Inc.
- 当前专利权人： Honeywell, Inc.
- 主分类号： F23N5/20
- IPC分类号： F23N5/20 ; F23N5/24
摘要：
A microprocessor-based power switching circuit responds to a common form of noise by disconnecting power from the controlled apparatus. The microprocessor provides an alternating voltage when power is to be provided, and the alternating voltage is converted by a detector circuit to a voltage close to ground which cuts off a transistor. When the transistor is cut off, an interface circuit places a thyristor which performs the actual power switching, into conduction. Noise on the base of the transistor can only drive it into conduction which then puts the thyristor into non-conduction.
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