Brushless motor driving circuit and method

Abstract

The invention discloses a brushless motor driving circuit and method. An emitter of a triode Q1 is connected with a capacitor C1, an adjustable resistor R1 and a voltage source power supply negative port, a collector of the triode Q1 is connected with the capacitor C1, the adjustable resistor R1 and a resistor R2 and then connected into a motor control chip U1, and the resistor R2 is connected with a voltage source power supply positive port; the collector of the triode Q1 is connected with the non-inverting input end of the error amplifier, the inverting input end of the triode Q1 is connected with the capacitor C2 and the resistor R3, the capacitor C2 and the resistor R3 are connected with the output end of the error amplifier, the output end of the motor adapter is connected with the inverting input end of the error amplifier, and the output end of the motor adapter is connected with the inverting input end of the first comparator. The resistor R5 is connected with a voltage sourcepower supply positive port, the resistor R5 is connected with an in-phase input end and the capacitor C3, and the capacitor C3 is connected with a voltage source power supply negative port; the firstcomparator is connected with a gate drive signal modulation circuit, and the gate drive signal modulation circuit is connected with a three-phase bridge inverter.

Description

technical field [0001] The invention belongs to the field of motor drive and relates to a brushless motor drive circuit and method. Background technique [0002] The traditional motor control adopts the direct start method, which leads to the problems of large starting current, large interference, poor control accuracy and low reliability. The starting current of this direct starting method will reach 5 to 7 times the rated current of the motor. On the one hand, it will affect the normal operation of other equipment. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a brushless motor drive circuit and method, which can reduce the starting current of the motor while ensuring the starting time and starting with load, and improve the working performance of the driver and the system . [0004] In order to achieve the above object, the present invention adopts the following tec...

AI Technical Summary

Problems solved by technology

[0002] The traditional motor control adopts the direct start method, which leads to the problems of large starting current, large interference, poor control accuracy and low reliability

The starting current of this direct starting method will reach 5 to 7 times the rated current of the motor. On the one hand, it will affect the normal operation of other equipment, and on the other hand, it will cause overheating of the motor winding and accelerate the aging of the motor.

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