Open direct current brushless motor controller based on six MOS tube power modules

Abstract

The outdated design idea of a closed direct current brushless motor controller driven by a high power MOS tube single module is reformed. Incomplete symmetry and PWM moment drive state and circuit layout irrationality of a direct current brushless motor controller load are discarded. According to the high power direct current brushless motor controller, a chopper function is realized; a single module which is composed of six high power MOS tubes is a unit; according to an actual need, free matching can be carried out, and an open direct current brushless motor controller is formed; separation of a drive module and a control module is realized; and the modules are combined with a control bottom plate through an open structure. Through the control bottom plate, the work mode of each single module and a peripheral circuit is coordinated. The construction of the direct current brushless motor controller is flexible. A module and the bottom plate can be used together. A number of modules and the control bottom plate can be combined for use. The controller can be used by a small power direct current brushless motor, such as the direct current brushless motor controllers of an electric bicycle and an electric tricycle. The controller can be used by a high power direct current brushless motor, such as the direct current brushless motor controller of an electric vehicle.

Description

Technical field [0001] The technical invention relates to a double-closed-loop DC brushless motor control system with Hall sensors for electric bicycles, electric motorcycles, electric tricycles and electric vehicles, especially suitable for electric vehicle power drive systems with high torque, high power and high acceleration. Background technique [0002] Under the pressure of environmental pollution, green transportation has become the main theme of people's travel, travel, transportation and other tools. In order to adapt to this change in the living environment, electric transportation has become an ideal choice for people. Due to the large driving torque of the DC brushless motor, good controllability and speed regulation performance, and it is very suitable to be driven by a power battery as a power source, the DC brushless motor has become the core component of the electric vehicle, and the stability of the DC brushless motor control system Performance, reliability,...

AI Technical Summary

Problems solved by technology

[0003] In the published patent literature, the so-called high-power brushless DC motor controller does not mention the open structure based on six MOS tube power modules. For example, the patent number authorized by the People's Republic of China on June 1, 2011 is 201020599702.3 titled "High Power MOS Tube Drive Device for Electric Bicycle Controller" just talked about what kind of circuit is used to trigger the high power MOS tube so that the high power MOS tube responds quickly and has low loss. For high-power DC brushless motors, the driving ability of a few small high-power MOS tubes is only a car, and the driving ability of high-power DC brushless motors is far from enough

The patent No. 201120503846.9 authorized by the People's Republic of China on January 18, 2012, titled "Drive Circuit for Electric Bicycle Controller" talks about how to expand the power module of the controller, but the way it adopts is to use a dedicated driver chip to drive multiple One MOS tube, the drive mode of multiple MOS tubes is a single module mode, then in the power module of the brushless DC motor controller, the number of MOS tubes distributed in the upper bridge arm and the lower bridge arm is more than one, and the number of MOS tubes is different. In the chopper drive, the response time of each MOS tube is not equal, and the load borne by each MOS tube is asymmetrical. In the power module with asymmetric load distribution, the damage of individual MOS tubes is large, resulting in the control of the entire brushless DC motor. Unstable device performance

The patent No. 201120503846.9 authorized by the People's Republic of China on July 11, 2012, titled "A High-Power Electric Vehicle Controller" only talks about the modular management of the functions of an electric vehicle controller, and only divides it from the function. block, which is convenient for the intelligent management of each function. It did not elaborate on how to expand the driving power, and did not jump out of the control mode of the entire brushless DC motor controller single module. It still uses six high-power MOS tube single modules for driving. The current is only about 20-30 amps. It is very difficult to drive a high-power brushless DC motor with such a small current

In the above three patents, there is no in-depth research and discussion on the symmetrical distribution of the load of the brushless DC motor controller, the instantaneous driving state of PWM and the rational layout of the circuit

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