A Fault Diagnosis Method for Fan Drive Stage
A technology of fault diagnosis and driving level, which is applied in the direction of motor generator test, short circuit test, etc., can solve the problems of failure to obtain fault state, shorten life, damage devices, etc., and achieve convenient, efficient and accurate diagnosis, small duty cycle fault detection , Improve the effect of using safety
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[0039] A fault diagnosis method for a fan driving stage proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims.
[0040] see figure 1 , the present embodiment provides a fault diagnosis method for a fan driving stage. The fan driving stage is provided with a low-side MOS tube and a high-side MOS tube. For the switch control of the drive circuit of the fan, the fault diagnosis method includes the following steps:
[0041] Diagnosis steps of the fan short-circuit fault to the power supply: open the low-side MOS tube and close the high-side MOS tube to connect the freewheeling circuit of the fan, and detect the source-drain voltage of the low-side MOS tube: if the source-drain voltage of the low-side MOS tube If the voltage is greater than the threshold, the fan is short-circuited...
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