Patent ID: 7161435
Filing Date: 2007-01-09
Classification: H03G,H03L

Abstract:
1. A feedback control circuit including a controlled circuit controlled by a control value; a comparing means for comparing an output value of the controlled circuit with a reference value, and for outputting a differential signal corresponding to the difference; and filter means for carrying out integral of or eliminating high frequency components of a compared result obtained by the comparing means, said feedback control circuit controlling the controlled circuit in response to the control value corresponding to an output signal of the filter means, said feedback control circuit comprising: first inverting means for inverting a polarity of the differential signal when the output of said filter means becomes a predetermined value; second inverting means installed at a post-stage of said filter means, for inverting an output polarity of a signal based on the output signal of said filter means when said first inverting means inverts the polarity of the differential signal; and add-subtract means for generating, when said first inverting means inverts the polarity of the differential signal, the control value by adding to or subtracting from the signal inverted by said second inverting means a value of that signal at inversion, or a specified value.