发明名称 |
Heater with duty cycle controller |
摘要 |
A heater including a sensing device for sensing an ambient temperature, a temperature input device for providing a user selectable input temperature both connected to a first circuit to control the heater. The first control circuit includes positive feedback and negative feedback to electrically define a temperature range. The first circuit provides an on/off time duty cycle output wherein the on to off time of the duty cycle is relative to the relationship between the temperature range and the sensed ambient temperature. A second circuit is connected to receive the duty cycle output from the first circuit and is further connected to an alternating current power source to provide a second output signal during the zero crossing of the alternating current power source and when the duty cycle output is present. A driver circuit is connected to receive this second signal and activates the heater when the second signal is active by providing a third signal to a triac which regulates power to the heater.
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申请公布号 |
US4777350(A) |
申请公布日期 |
1988.10.11 |
申请号 |
US19840658696 |
申请日期 |
1984.10.09 |
申请人 |
RANCO ELECTRONICS DIVISION |
发明人 |
CROCKET, CHARLES;BENGSTON, MERLE |
分类号 |
G05D23/24;(IPC1-7):H05B1/02 |
主分类号 |
G05D23/24 |
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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