Control circuit of wide-voltage brushless motor

Abstract

The invention discloses a control circuit of a wide-voltage brushless motor. The control circuit is self-adapted to the working voltage of a power tube and can sense the voltage and the current of a power switch tube. The control circuit comprises a microprocessor, a motor-driving circuit, a power output circuit and a DC-DC (direct current) converting circuit, wherein the power output circuit comprises three power-driving groups, the DC-DC converting circuit is used for converting a stabilized-voltage power supply which is used for supplying DC voltage to the microprocessor and the power output circuit into the stabilized-voltage power supply which is respectively used for supplying DC working voltage to the microprocessor and the power output circuit, each power-driving group comprises an upper power switch tube and a lower power switch tube, the source electrodes or the emitting electrodes of all the lower power switch tubes are connected with the corresponding A/D (Analog to Digital)input ends of the microprocessor by a sampling amplifying circuit after the source electrodes or the emitting electrodes of all the lower power switch tubes are connected in parallel, the three output ends of the power output circuit, i.e. the connecting parts of the source electrodes or the emitting electrodes of the upper power switch tubes and the drain electrodes or the collecting electrode of the lower power switch tubes, are respectively connected through the corresponding A/D (Analog to Digital)input ends of the microprocessor by one sampling amplifying circuit. The control circuit is mainly used for driving the brushless motor.

Description

technical field [0001] The invention relates to a control circuit of a motor, in particular to a control circuit of a wide-voltage brushless motor. Background technique [0002] At present, brushless motors are usually used as power in electric tools, and the specific structure of the control circuit in the brushless motor controller includes: a microprocessor, a motor drive circuit, a power output circuit, and a microprocessor, a motor drive circuit and The power output circuits respectively provide DC power supplies of DC voltage, and all control input terminals of the motor drive circuit are respectively connected with the corresponding output terminals of the microprocessor; the power output circuits include three power drive groups, each power drive group Including the upper power MOS tube and the lower power MOS tube, the drains of all the upper power MOS tubes are connected in parallel, and connected to the corresponding voltage output end of the DC power supply, that...

AI Technical Summary

Problems solved by technology

[0003] 1. The scope of use is narrow and the versatility is not good, resulting in products with different voltage levels needing to correspond to different control circuits

[0004] 2. The working efficiency is low, resulting in increased power consumption when overloaded, and the motor heats up, which further causes the performance of the motor to decline

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