Direct-current bus voltage detection circuit of variable-frequency speed governor
The utility model relates to a direct-current bus voltage detection circuit of a variable-frequency speed governor. The direct-current bus voltage detection circuit comprises a voltage-dividing current-limiting clamping circuit, a differential input amplifying circuit and a proportion amplifying cir...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The utility model relates to a direct-current bus voltage detection circuit of a variable-frequency speed governor. The direct-current bus voltage detection circuit comprises a voltage-dividing current-limiting clamping circuit, a differential input amplifying circuit and a proportion amplifying circuit, one end of a first series resistor circuit of the voltage-dividing current-limiting clamping circuit is connected with a voltage end of a direct-current bus while the other end of the same is connected with the differential input amplifying circuit, a first diode anode, a second diode cathode and a first resistor respectively, one end of a second series resistor of the voltage-dividing current-limiting clamping circuit is connected with a grounding end of the direct-current bus while the other end of the same is connected with the differential input amplifying circuit, a first diode cathode and a second diode anode, an input end of a first operation amplifier of the differential input amplifying circuit is co |
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