Phase signal detection device of AC generator
A technology of alternator and detection device, applied in the directions of motor generator testing, measurement device, frequency measurement device, etc., can solve the problem of affecting vehicle startup, inability to accurately calculate alternator phase voltage and frequency information, and reducing battery standby time. and other problems to ensure the effect of normal work
Active Publication Date: 2021-12-14
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology
Therefore can cause two problems: (1) will cause the standby time of accumulator in the vehicle to reduce, seriously possibly affect the starting of vehicle
(2) The voltage value of the DC signal will change according to the leakage of the rectifier component, and the reference voltage of the comparator is a fixed value, so the calculation unit cannot accurately calculate the phase voltage and frequency information of the alternator
[0006] However, the traditional phase signal detection technology based on a single comparator structure still has certain shortcomings
When the generator is in an abnormal mode (turn off the electrical load or the set voltage deviates greatly from the actual value), the phase voltage will continue to drop, and the traditional single comparator structure of the alternator phase signal detection circuit cannot judge whether the generator is abnormal mode, so that the circuit with this structure cannot accurately judge the phase voltage and frequency signal of the alternator at this time
Abnormal mode for a long time will cause electrical failure inside the car
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[0048] The present disclosure provides a phase signal detection device of an alternator. The device includes two comparators with different input common-mode ranges. This structure has the function of image enhancement. When the voltage change signal (PhaseOK) signal is detected to be lost , which can indicate that the generator is in an abnormal mode, in which, the electric load is turned off or the set voltage deviates greatly from the actual value. At this time, the digital processing unit controls the power MOS tube to normally open to realize the rise of the phase voltage, and avoid the generator for a long time. Being in an abnormal mode causes an electrical failure, thereby ensuring the normal operation of the entire automotive electrical system. At the same time, according to the needs, the fuse on the chip can be used to configure the debounce time of the debounce circuit to filter out the narrow pulse caused by the excitation switch, which can overcome the main shortc...
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The invention provides a phase signal detection device for an AC generator. The device comprises a phase signal processing unit which is used for obtaining a phase signal of the output voltage of the AC generator, and conducting the voltage division processing of the phase signal to obtain a voltage-divided phase signal, a voltage signal acquisition unit which is used for comparing the voltage value of the voltage division phase signal with a threshold value set in the voltage signal acquisition unit to obtain a voltage signal, a rotating speed signal acquisition unit which is used for comparing the voltage value of the voltage division phase signal with a threshold value set in the rotating speed signal acquisition unit to obtain a rotating speed signal, and a digital processing unit which is used for analyzing the rising edge times of the voltage signal and the rotating speed signal to obtain the phase signal state of the AC generator.
Description
technical field [0001] The present disclosure relates to the technical field of automobile generators, in particular to a phase signal detection device of an alternator. Background technique [0002] With the development of the times, automobiles have become an indispensable means of transportation for modern people. Engines, generators and batteries are usually installed in automobiles. The electric energy of the car is stored in the battery, which is used to store the power to start the car; after the engine is started by using the electric energy of the battery, it is connected to the generator through the transmission device, and the generator converts the kinetic energy into three-phase alternating current. Part of this AC signal is stored in the battery through rectification, and the other part provides electricity to the electronic devices in the car. [0003] The generator generates electricity according to the principle of electromagnetic induction, and the induced...
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Login to View More IPC IPC(8): G01R31/34G01R19/25G01R23/02
CPCG01R31/34G01R19/2503G01R23/02
Inventor 常育宽袁芳郭玉洁寇玉霞杨沛张旭
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI