| 摘要 |
<p>A circuit to compensate a skin current by applying an A.C. bias to a D.C. bias of a flame rod structure is disclosed, the circuit comprising means (22) for generating a D.C. bias signal; means (26) for generating an excitation frequency signal, the excitation signal being an A.C. bias relative to the flame rod structure (100); means (24) for mixing the D.C. bias signal with the excitation signal and generating a mixed signal of a predetermined frequency; means (28) for receiving the mixed signal, for sensing a flame state signal of the flame rod structure (100), and for generating a flame sensed signal; means (38), connected to the sensing means, for separating the excitation signal from the flame sensed signal; means, connected to the sensing means for convoluting the flame sensed signal to obtain a convoluted flamed sensed signal; means (30) for filtering the convoluted flame sensed signal to obtain a sensing frequency signal; means (32) for shaping a waveform of the sensing frequency signal and generating a shaped signal; a microprocessor (20) for processing the shaped signal and the excitation signal from the separating means and generating a compensating signal; and means (36) for converting the compensating signal into a signal having a frequency indicative of a voltage of the compensating signal. <IMAGE></p> |
