Power supply voltage sampling circuit
The utility model aims to provide the power supply voltage sampling circuit which is simple in structure, good in stability and high in fidelity rate. The circuit comprises a power supply input voltage sampling circuit and a power supply output voltage sampling circuit, and the power supply input vo...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The utility model aims to provide the power supply voltage sampling circuit which is simple in structure, good in stability and high in fidelity rate. The circuit comprises a power supply input voltage sampling circuit and a power supply output voltage sampling circuit, and the power supply input voltage sampling circuit comprises an input voltage input end and an input voltage output end. The input voltage follower (U8.1) is used for buffering and isolating an input voltage signal, and the input operational amplifier (U8.4) is used for carrying out proportional operational amplification on a signal output by the input voltage follower. The input operational amplifier meets the condition of virtual short and virtual disconnection, and the input voltage output end is arranged at the output end of the input operational amplifier; the power supply output voltage sampling circuit further comprises a voltage output end in-phase voltage negative feedback circuit arranged between the output voltage input end and the |
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