Electric bicycle antitheft control device and method based on winding short circuit

Abstract

The invention discloses an electric bicycle antitheft control device and method based on winding short circuit. The control device sequentially comprises a brushless direct-current motor, a three-phase bridge inverter and a single-chip microcomputer which are connected annularly. The three-end output of the three-phase bridge inverter is connected with the three-phase winding of the brushless direct-current motor. The Hall signal output by the brushless direct-current motor is connected with the single-chip microcomputer. The output of the single-chip microcomputer is connected with the control end of each power tube in the three-phase bridge inverter. The single-chip microcomputer controls the brushless direct-current motor through on and off of the power tubes in the three-phase bridge inverter. The control method includes: a user switched off an electric bicycle and pull out the key of the electric bicycle, the power supply of the electric bicycle is switched off, the single-chip microcomputer set a reasonable manual dragging distance H and calculates actual dragging distance according to the Hall signal, when the distance is larger than the vigilance set value H, the single-chip microcomputer controls the three lower bride power tubes of the three-phase bridge inverted to be switched on simultaneously, and accordingly short circuit of the three-phase winding of the brushless direct-current motor is achieved, and the antitheft effect of the electric bicycle is achieved.

Description

Technical field [0001] The invention belongs to the technical field of electronic control, and particularly relates to an anti-theft control device and a control method for an electric bicycle based on short-circuiting of windings. Background technique [0002] The anti-theft control method of electric bicycle based on short-circuit winding realized by electronic control device is: the single-chip microcomputer judges whether the electric bicycle is forcibly displaced in the electric bicycle parking mode, and automatically returns according to the built-in program. Brushless DC motors are widely used in the electric vehicle and electric bicycle market. The commonly used method of electric vehicle anti-theft devices is that the microcontroller controls the corresponding thyristor on and off to make the brushless DC motor three-phase short circuit to achieve hard anti-theft. Through the design of the microcontroller peripheral sensor The circuit makes the horn send out an alarm sig...

AI Technical Summary

Problems solved by technology

Brushless DC motors are widely used in the market of electric vehicles and electric bicycles. The commonly used anti-theft device for electric vehicles adopts the method of controlling the corresponding thyristor on and off by the single-chip microcomputer to short-circuit the three-phase of the brushless DC motor to realize hard anti-theft. By designing the peripheral sensor of the single-chip microcomputer The circuit makes the horn send an alarm signal to realize soft anti-theft. However, this anti-theft control device is prone to "misjudgment". When pedestrians accidentally touch it or the staff arranges the parking space, it will also trigger an alarm, which affects the living environment; secondly, within the distance of the user Car thieves can still forcibly tow the car away

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