发明名称 |
SCHALTUNGSANORDNUNG ZUR REGELUNG DER TEMPERATUR EINES HEIZELEMENTS |
摘要 |
<p>The temperature of a heating element (3), which heating element has a temperature dependent resistance, is measured by comparing the current through it with a user adjustable reference value. The AC voltage across a current sensing resistor (7) in series with the heating element (3) is compared in a comparator (9) with a reference AC voltage generated at a tap (6) of a voltage divider (8). The phase of the logic output signal of the comparator (9) indicates a first state in which the heating element (3) is too hot or is not conducting, or a second state in which the heating element (3) is too cold and conducting. A second comparator (16) detects whether or not the heating element (3) is conducting. A logic gate (18) and a latch (17) switch on the current through the heating element (3) in response to timed pulses from a timing circuit (15) and switch off the current through the heating element (3) when the heating element (3) is conducting and too hot.</p> |
申请公布号 |
DE69703646(D1) |
申请公布日期 |
2001.01.11 |
申请号 |
DE1997603646 |
申请日期 |
1997.05.28 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V., EINDHOVEN |
发明人 |
HANCOCK, TIMOTHY;CRAWFORD, SYDNEY |
分类号 |
G05D23/24;H05B1/02;(IPC1-7):G05D23/24 |
主分类号 |
G05D23/24 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|