Brushless direct current motor control system current sampling method
A brushed DC motor and current sampling technology, applied in the automotive field, can solve the problems of inaccurate current sampling time point, heavy MCU system load, and untimely current feedback, so as to reduce the computational workload, avoid interference, and reduce the load.
Active Publication Date: 2017-04-05
LIANCHUANG AUTOMOBILE ELECTRONICS
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Problems solved by technology
The following problems exist in the existing current sampling technology: 1) the time point of current sampling is inaccurate; 2) the current sampling is inaccurate in the case of small duty cycle; 3) the current feedback is not timely; 4) the MCU system load bigger
Method used
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Embodiment Construction
[0026] Such as Figure 4 As shown, an embodiment of the current sampling method of the brushless DC motor control system provided by the present invention includes the following steps:
[0027] Configure drive PWM channel, timing PWM channel and DMA channel;
[0028] The driving PWM channel and the timing PWM channel have the same cycle, different duty cycles, and use the same clock;
[0029] The drive PWM channel is used to drive the DC motor, and the drive PWM channel first outputs a low duty cycle and then outputs a high duty cycle in a complete cycle;
[0030] The timing PWM channel is used to drive the AD current sampling work. The timing PWM channel first outputs a high duty cycle and then outputs a low duty cycle in a complete cycle. The falling edge of the timing PWM channel triggers the AD current sampling process (that is, AD conversion). The timing PWM The rising edge of the channel enables AD current sampling;
[0031] The cycle of driving the PWM channel and th...
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The invention discloses a brushless direct current motor control system current sampling method. The method includes that a driving PWM channel and a timing PWM channel are consistent in cycle, different in duty ratio, and share the same one clock; the driving PWM channel is used for driving a direct current motor and outputs low duty ratio at first and then outputs high duty ratio in a complete cycle; the timing PWM channel is used for driving the AD current sampling and outputs high duty ratio at first and then outputs low duty ratio in a complete cycle; the timing PWM channel falling edge triggers the AD current sampling processing, and the timing PWM channel rising edge enables the AD current sampling; the cycle of the driving PWM channel and the timing PWM channel satisfies T=T1+TA, T1 refers to timing PWM channel output high duty ratio cycle and TA refers to the AD current sampling cycle; and a DMA channel generates the DMA interruption, and each time a preset number of sampling times is generated, a DMA interrupt is generated and the AD current sampling data is read out. According to the method, the accurate current sampling can be obtained, and the MCU system operating load can be reduced.
Description
technical field [0001] The invention relates to the field of automobiles, in particular to a current sampling method for a brushless DC motor control system. Background technique [0002] The brushless DC motor consists of a motor body and a driver, and is a typical mechatronic product. The stator windings of the motor are mostly made into a three-phase symmetrical star connection, which is very similar to the three-phase asynchronous motor. Magnetized permanent magnets are attached to the rotor of the motor. In order to detect the polarity of the motor rotor, a position sensor is installed in the motor. The driver is composed of power electronic devices and integrated circuits, etc. Its functions are: to receive the start, stop, and brake signals of the motor to control the start, stop, and brake of the motor; to accept the signal of the position sensor and the forward and reverse signals to control the reverse The on-off of each power tube of the variable bridge generate...
Claims
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IPC IPC(8): H02P6/00G01R19/00
Inventor 孙利干盛旭威
Owner LIANCHUANG AUTOMOBILE ELECTRONICS