Alternating current input voltage sampling circuit and device for bridgeless PFC (Power Factor Correction) control
The utility model provides an AC input voltage sampling circuit and device for bridgeless PFC control, and the circuit comprises a forward voltage amplification circuit which is used for sampling a forward amplification signal of an AC input voltage; the negative voltage amplification circuit is use...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The utility model provides an AC input voltage sampling circuit and device for bridgeless PFC control, and the circuit comprises a forward voltage amplification circuit which is used for sampling a forward amplification signal of an AC input voltage; the negative voltage amplification circuit is used for sampling a negative amplification signal of the alternating current input voltage; the positive voltage amplification circuit and the negative voltage amplification circuit are connected in parallel at two ends of alternating current input voltage, and each of the positive voltage amplification circuit and the negative voltage amplification circuit comprises a resistance voltage division circuit, an operational amplifier, an operational amplifier power supply and a reference power supply; wherein the resistance voltage division circuit is used for dividing alternating current input voltage and is connected to the input end of the operational amplifier; the operational amplifier power supply is used for connec |
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