Power supply circuit, circuit fault detection method, circuit board and vehicle air conditioner

Abstract

The invention discloses a power supply circuit, a circuit fault detection method, a circuit board and a vehicle-mounted air conditioner. The power supply circuit includes a boost circuit, a first detection component and a controller. Components, a first switch component, a second switch component and a first capacitor; when the first switch component is turned on and the second switch component is off, the first capacitor is in a charging state; when the first switch component is off and the second switch When the component is turned on, the first capacitor is in a discharging state; after the first capacitor is discharged, the first detecting component acquires a first signal value at both ends of the first capacitor and outputs a first voltage value; and after the first capacitor is charged , to obtain the second signal value at both ends of the first capacitor, and output the second voltage value; based on these two voltage values, the controller cooperates to detect the fault state of the first capacitor, thereby adjusting the operating state of the circuit, such as reducing the conduction of the switch tube Long time, to avoid damage to the switch tube.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a power supply circuit, a circuit fault detection method, a circuit board and a vehicle air conditioner. Background technique [0002] At present, car air conditioners generally use batteries to drive the operation, but using batteries to directly drive the compressor needs to output a very large current, so that the compressor needs to use very thick copper wires for winding; the existing car air conditioner power supply circuit generally uses the battery The voltage is provided to the compressor after step-up conversion. Since the voltage step-up can reduce the current under the same power, the purpose of reducing the volume and cost of the compressor can be achieved. [0003] However, the existing power supply circuit generally adopts two interleaved boost circuits, using two switch parts to control the operation of the two boost circuits respectively, and a film capa...

AI Technical Summary

Problems solved by technology

When the film capacitor attenuates, the switching components in the boost circuit will bear a higher turn-off voltage, which will easily cause damage to the switching components, thus causing the power supply circuit to fail. The existing power supply circuit does not detect the state of the film capacitor. measure

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