| 摘要 |
An arrangement is provided for accurately sensing the source voltage of a hi gh- impedance source while supplying a variable burden. A current-sensing element is connected in series with a load circuit across a high-impedance source. The load circu it includes a variable burden load. A shunt regulator is connected with the variable burde n load and is arranged to operate so that the combination of the shunt regulator and the variable burden present a controlled, nearly constant burden to the high-impedance source. T he source voltage of the high-impedance source is sensed via the voltage across the series current-sensing element. While the output voltage is directly proportional to the burden, th e output current is essentially unaffected by small variations in the burden. Thus, the current through the series current-sensing element is utilized to accurately sense the voltage of the high-impedance alternating-current source while also supplying the variable burden load suc h as a battery, electrical circuitry, and a switch operator.
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