发明名称 |
TEMPERATURE CONTROL CIRCUIT |
摘要 |
PURPOSE:To attain a fail-safe system of a temperature control circuit as a whole by providing a temperature switch circuit which switches the set temperature level in response to the output pulse of a pulse generating circuit to a temperature detecting circuit together with a comparator which compares the set temperature value with the value of the temperature sensor. CONSTITUTION:A CPU 2 delivers the pulse signal of a fixed cycle through an output (a) and impresses it to a pulse transformer 3. The induced voltage of a secondary winding is rectified by a diode 4 and smoothed by a capacitor 5 to be impressed to a coil of a solenoid valve 6. When no pulse signal is avail able, the transformer 3 has no actuation any more. Then the valve 6 is closed. A temperature detecting circuit 18 compares the voltage divided potentials of a temperature sensor 7 with the reference set potential divided by resistances 21 and 22 through a comparator 23. Then the high and low signals are delivered to the CPU 2 with high and low temperatures respectively. Thus a resistance 26 is intermitted in parallel to a resistance 22 in response to the pulse signal. Then the relay potential eS is switched between eS1 and eS2. |
申请公布号 |
JPS61196310(A) |
申请公布日期 |
1986.08.30 |
申请号 |
JP19850038021 |
申请日期 |
1985.02.27 |
申请人 |
MATSUSHITA ELECTRIC IND CO LTD |
发明人 |
MORI KEIICHI;NAKAJIMA AKIHIKO;TAKESHITA SHIRO |
分类号 |
G05D23/19;G05D23/24 |
主分类号 |
G05D23/19 |
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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