Speed ​​regulating device for automobile air conditioner blower

Abstract

The invention discloses a speed regulating apparatus used for an automobile air conditioner air blower. The speed regulating apparatus comprises a radiator, a socket and a cover board matched with the socket, wherein the bottom of the socket is buckled on the radiator; a PCB and an MOS transistor and a temperature fuse electrically connected with a controller on the PCB are arranged in the socket; the speed regulating apparatus also comprises a blower speed regulating switch circuit electrically connected with the controller on the PCB; and when the speed regulating apparatus is in use, the blower speed regulating switch circuit can perform current regulation on the MOS transistor. In two conventional overheat protection ways, a speed regulating module is in failure immediately after a thermal protection effect is realized in one scheme; the service life of the temperature fuse is affected caused by continuous connection of a high current in the other scheme; specific to the defects, the invention provides a new automobile air conditioner speed regulating module; and it is ensured that shortening of the service life of the temperature fuse caused by continuous connection of the high current in the overtemperature protection process can be avoided under the premise of enabling the temperature fuse to be connected with a control loop in series.

Description

technical field [0001] The invention relates to the field of automobile air conditioners, in particular to a speed regulating device for an automobile air conditioner blower. Background technique [0002] At present, automobile air conditioners have become an indispensable and important accessory in automobiles. The working principle of the existing automobile air conditioner fan speed control module is to connect it in series with the blower in the same circuit, and use its own voltage dividing function to adjust the voltage at both ends of the blower to realize the adjustment of the blower. Rotating speed. When the calorific value of the speed control module itself reaches a certain level, the temperature insurance in the speed control module will be fused to ensure the safety of the vehicle; there are two traditional thermal protection methods: the first is through the temperature sensor inside the chip To achieve protection, this solution is costly and complicated, and ...

AI Technical Summary

Problems solved by technology

When the calorific value of the speed control module itself reaches a certain level, the temperature insurance in the speed control module will be fused to ensure the safety of the vehicle; there are two traditional thermal protection methods: the first is through the temperature sensor inside the chip To achieve protection, this solution is costly and complicated, and this solution can only perform thermal protection once. After the thermal protection function is realized, the speed control module will immediately fail and cannot continue to work, and the cost of replacement is relatively high; the second is through The temperature insurance of the external main circuit is fused to achieve protection, but the temperature insurance is set on the main circuit in this scheme, and the temperature insurance has a continuous large current passing through it. When the large current passes through the temperature insurance, the temperature insurance itself will generate heat, which will lead to inaccurate fusing temperature The life of the thermal fuse will be reduced if the fuse is connected to a large current for a long time

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