lpm speed control module for automobile air conditioner blower

Abstract

The invention discloses an LPM speed adjusting module for an automobile air conditioner air blower. An operational amplifier and a dual-power MOSFET are adopted to be combined with a discrete electronic component for building an analog circuit, and the LPM speed adjusting module with the comprehensive function for the air blower is achieved, wherein the dual-power MOSFET is sufficiently and flatly attached to a heat dissipater for dissipating heat emitted by the dual-power MOSFET in the working process so as to work at the quite safe and reliable rated working environment temperature. The LPM speed adjusting module internally has a VB+ voltage switch control function besides the stepless speed adjustment function for the air speed of the air blower so as to reduce static consumption current in the silence state, and therefore automobile battery electricity loss is prevented. Internal VB+ voltage is turned off when the LPM speed adjusting module is in the zero air speed gear to achieve no electric charge internally. The LPM speed adjusting module further has the main functions of overvoltage protection, overtemperature protection, current limiting protection, locked rotor protection and short circuit protection, and is stable, reliable, low in manufacturing and material cost and strong in anti-electromagnetic interference ability.

Description

technical field [0001] The invention is applicable to the technical field of control and speed regulation of an automobile air-conditioning blower, and in particular relates to an LPM speed regulation module for an automobile air-conditioning blower. Background technique [0002] The automotive air conditioning system is mainly used to cool, heat, ventilate and purify the air in the cab. At present, most low-end automotive air conditioning systems on the market still use blower speed regulating resistors, and more than half of them are connected in series. The speed is adjusted by the way of resistor division, and the resistance value in the blower circuit is used to adjust the voltage, so as to achieve the purpose of adjusting the speed of the blower. The resistance value of the low-grade bit string is large, the resistance value of the mid-range bit string is small, and the high-end bit string has no resistance value. [0003] Although this method has simple technology an...

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Problems solved by technology

[0006] In view of the above problems, the object of the present invention is to provide a LPM speed regulation module suitable for controlling the speed of the blower of an automobile air conditioner, aiming to solve the technical problems that the existing speed regulation resistors and simple FET speed regulation modules have less protection functions and are unstable

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