Patent ID: 7605584
Filing Date: 2009-10-20
Classification: G01R

Abstract:
1. A voltage generating apparatus that outputs a power source voltage from a voltage outputting terminal comprising: a voltage outputting section that outputs the power source voltage according to an input current; a first differential amplification section that compares the power source voltage and a preset first reference voltage to output a first control current reducing the power source voltage output from the voltage outputting section when the power source voltage is larger than the first reference voltage and output the first control current raising the power source voltage output from the voltage outputting section when the power source voltage is smaller than the first reference voltage; a current detector that detects a detecting voltage according to a power source current output from the voltage outputting terminal; a third current output differential amplification section that compares the detecting voltage detected from the current detector and a second reference voltage to output a current proportional to a voltage obtained by subtracting the second reference voltage from the detecting voltage; a fourth current output differential amplification section that compares the detecting voltage detected from the current detector and a seventh reference voltage to output a current proportional to a voltage obtained by subtracting the seventh reference voltage from the detecting voltage and having a polarity opposite to the current output by the third current output differential amplification section; an addition section that inputs, into the voltage outputting section, a current obtained by adding the first control current, the current output by the third current output differential amplification section, and the current output by the fourth current output differential amplification section; a third differential amplification section that supplies a voltage obtained by amplifying a difference voltage obtained by subtracting the detecting voltage from a preset third reference voltage to the third current output differential amplification section as the second reference voltage; and a seventh differential amplification section that supplies a voltage obtained by amplifying a difference voltage obtained by subtracting the detecting voltage from a preset eighth reference voltage to the fourth current output differential amplification section as the seventh reference voltage.