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AssigneeGuangdong Carrier Heating, Ventilation and Air Conditioning Co., Ltd.
InventorsShanghua Feng, Yulin Li, Huandi Yang
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An AC-side precharge-isolation-detection circuit is connected in parallel to both ends of the current limiting resistor PTC of the AC-side precharge circuit. The AC-side precharge-isolation-detection circuit includes a step-down rectifier module, an optocoupler isolation module, and a voltage drop detection module, wherein the step-down rectifier module is connected in parallel to the current limiting resistor PTC on the AC side, the input end of the optocoupler isolation module is connected to the step-down rectifier module, and the output end of the optocoupler isolation module is connected to the voltage drop detection module. The invention can realize isolation of operating voltages at the pre-stage input and the post-stage output for the AC-side precharge-isolation-detection circuit through the optocoupler, detect voltage drop change across the current limiting resistor PTC of the precharge circuit, and transfer a voltage drop output signal to the MCU.
An AC-side precharge-isolation-detection circuit, comprising a step-down rectifier module, an optocoupler isolation module and a voltage drop detection module, wherein the step-down rectifier module is connected in parallel to both ends of a current limiting resistor of a precharge circuit, an input end of the optocoupler isolation module is connected to the step-down rectifier module, and an output end of the optocoupler isolation module is connected to the voltage drop detection module, wherein
Dependencies are inferred from the claim text.