Air volume speed regulation circuit for automobile air conditioner

Abstract

The invention discloses an air volume speed regulation circuit for an automobile air conditioner. A G electrode and an S electrode of an MOS transistor are connected with a control circuit. A D electrode of the MOS transistor is connected with an air blower motor. The S electrode collects transient working currents of an air blower loop and is grounded through a current protection circuit. The air volume speed regulation circuit has the advantages that by adding an over-current protection circuit unit of a speed regulation module, the working performance of an air volume module and the protective performance of an air conditioner system are improved, and components of related hardware circuits are also reduced; air volume control signals works stably, and the control requirements of a panel controller are simple and convenient; an additional protection circuit does not need to be used, so that the production cost is lowered.

Description

technical field [0001] The invention relates to an automobile air conditioner, in particular to an air volume speed regulating module of an automobile air conditioner. Background technique [0002] At present, the blower wind speed regulator of the automatic air conditioner of the car uses the MOS tube to adjust the change of the current value, so that the air volume changes. The temperature protection of MOS tube heating is mostly realized by thermal fuse. When the MOS tube is working abnormally and cannot dissipate heat normally, the thermal fuse will sense the heat change of the MOS tube. When it reaches a certain range, the thermal fuse will blow and cut off the working circuit of the MOS tube, thereby protecting the blower from stalling and damaging the HVAC shell. No thermal deformation or potential melting risk. [0003] However, from the point of view of the blower control of the vehicle air conditioner, there are some abnormal instantaneous impact currents. Becaus...

AI Technical Summary

Problems solved by technology

[0003] However, from the point of view of the blower control of the vehicle air conditioner, there are some abnormal instantaneous impact currents. Because the power of the current impact is short and cannot reach the protection temperature of the MOS tube, the impact on the blower and the MOS tube cannot be effectively protected. And there is a risk that the fuse of the whole vehicle will blow out instantly, causing the air conditioning system of the whole vehicle to fail

Images