发明名称 |
Dynamic DC biasing and leakage compensation |
摘要 |
A system for adjusting a bias voltage of a flame sensing system. The system may use pulse width modulation to adjust the bias voltage. The system may have a flame sensing rod that conveys an electrical equivalent circuit of a flame presence to a detector via low pass filter. An excitation voltage may be conveyed via a DC blocking mechanism to the sensing rod. A pulse width modulation signal may be conveyed via a bias resistor to a node of the low pass filter and the detector. The input of an A/D converter may be that of the detector for flame signals. Also, leakages between the node of the A/D converter connection and the voltage source and/or ground may be detected and compensated. Further, leakage of the DC blocking mechanism may be minimized.
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申请公布号 |
US7800508(B2) |
申请公布日期 |
2010.09.21 |
申请号 |
US20050908463 |
申请日期 |
2005.05.12 |
申请人 |
HONEYWELL INTERNATIONAL INC. |
发明人 |
CHIAN BRENT;ADAMS JOHN T.;NORDBERG TIMOTHY J.;HILL BRUCE;ANDERSON PETER M. |
分类号 |
G08B17/12 |
主分类号 |
G08B17/12 |
代理机构 |
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