| 摘要 |
<p>PURPOSE:To enable a stable operation, by connecting a current limiting means to the primary winding of a transformer, and connecting a second feedback resistor and a series circuit of a first feedback resistor and a capacitor, between the output terminal and the inversion input part of an amplifying means, and between the output terminal and the noninversion input part, respectively. CONSTITUTION:A primary winding 23 and a secondary winding 24 are wound on an iron core 21, and input terminals 10, 11 are connected to the primary winding 23 via a resistor R11, a current limiting means. The one end of the secondary winding 24 is connected to the inversion input part of an operational, amplifier 42, an amplifying means, and the other end of the secondary winding 24 is connected to the noninversion input part of the operational amplifier 42 via a compensation resistor Rc. Between the output terminal and the noninversion input part, a series circuit of a first feedback resistor R1 and a capacitor C1 is connected. Between the output terminal and the inversion input part, a second resistor R2 is connected. The series circuit of the resistor R1 and a capacitor C1 are connected, and a specified AC positive feedback is applied without DC positive feedback, thereby obtaining an error compensation type transformer wherein DC shift due to offset voltage or the like is small.</p> |
