Braking current control method and device for electric bicycle controller
A technology of electric bicycles and braking current, applied in the direction of torque ripple control, etc., can solve problems such as failure to apply, failure to meet system requirements, and generation of braking torque, so as to prolong life, avoid braking torque, and reduce mechanical noise effect
Inactive Publication Date: 2013-10-30
RENESAS ELECTRONICS (CHINA) CO LTD
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[0006] In the 180-degree sine wave control mode, the system speed is adjusted by adjusting the duty cycle of the driving signal. This control mode can operate normally under the condition of output torque, but when the electric bicycle is sliding, it will cause the reaction of the speed. When the electromotive force is greater than the input voltage, braking torque will be generated, so it does not meet the system requirements and cannot be applied in actual products
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[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0030] The embodiment of the present invention is to eliminate the braking torque generated due to the input voltage of the motor being lower than the back electromotive force of the motor in the 180-degree sine wave control mode. By adopting the embodiment of the present invention, the electric bicycle does not generate braking torque under all operating conditions, thereby solving the application problem in actual products.
[0031] In order to describe the embodiment of the present invention more clearly, a common electric bicycle controller in the prior art is bri...
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The invention discloses a braking current control method and device for an electric bicycle controller. The braking current control method for the electric bicycle controller comprises the following steps of: in a 180-degree sine wave control mode, detecting the bus current of the electric bicycle controller; when the bus current is smaller than a first threshold value, switching the controller from a double-bridge-arm modulation mode to a single-bridge-arm modulation mode and adjusting the duty cycle of a driving signal; and when the bus current is greater than a second threshold value, switching the controller from the single-bridge-arm modulation mode to the double-bridge-arm modulation mode and adjusting the duty cycle of the driving signal, wherein the second threshold value is more than the first threshold value. Due to the adoption of the method and the device, the generation of brake torque in the 180-degree sine wave control mode can be avoided, and the 180-degree sine wave control mode meets system requirements and can be applied to practical products.
Description
technical field [0001] The invention relates to the technical field of electric bicycles, in particular to a braking current control method and device of an electric bicycle controller. Background technique [0002] At present, the controllers used in electric bicycles (E-BIKE) usually adopt the control mode of 120-degree square wave control mode. A Hall signal divides the 360-degree electrical angle into six intervals. In each interval, only two phases of the motor are energized, and three phases of the motor are sequentially energized in six consecutive intervals to obtain six directions. The torque makes the motor rotate in the direction of the torque rotation. In this control mode, the phase current waveform is a square wave current. [0003] However, since the direction of the electromagnetic field generated by the electric bicycle controller in the 120-degree square wave control mode is fixed in each interval, the angle between the direction of the generated electrom...
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IPC IPC(8): H02P6/10
Inventor 张广栋闫在春
Owner RENESAS ELECTRONICS (CHINA) CO LTD