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Motor control single-resistance sampling method

A single-resistor sampling and motor control technology, which is applied in the electronic field, can solve problems such as data loss, increased MCU cost, and motor operation errors, and achieves the effects of stable sampling process, smooth implementation, and wide application

Active Publication Date: 2019-12-31
四川中微芯成科技有限公司
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Problems solved by technology

[0004] The disadvantage of method 1 is that it will interrupt the execution of the ongoing FOC motor algorithm; the disadvantage of method 2 is that many low-end MCUs do not have DMA function, because it will increase the cost of MCU; the disadvantage of method 3 is that once there is an interference signal If the pointer of the FIFO is wrong, all the data will be messed up, which will cause the motor to run incorrectly

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present invention.

[0021] AMEC M0 MCU has built-in 2 general-purpose operational amplifiers and 2 ADC modules (one low-speed 100Ksps ADC (ADC0), one high-speed 2Msps ADC (ADC1)). The ADC input channel can choose external pin input, or directly connect to the signal inside the chip, such as the output of op amp 0 / 1 and the output of PGA0 / 1. Assuming that op amp 0 is selected to amplify the current flowing through the sense resistor, the internal ADC channel can be selected to read the output voltage of op amp 0. At the same time, the output pin of op amp 0 can be multiplexed into other external ADC channels. In this case, equivalent to 2 ADC channels, the single-resistor technology can be perfectly realized.

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Abstract

The invention relates to the field of electronic technology, in particular to a motor control single-resistance sampling method, and specifically discloses a pin multiplexing technology using a mediummicro MO chip, and an ADC inner channel technology. One pin (OP_O / ADC_CH2) in the medium micro MO chip corresponds to two ADC channels, and correspondingly, two ADC result registers are provided, andthe results of twice sampling can be respectively registered in two ADC result registers in a sampling process to achieve the stability of the sampling process and to obtain accurate sampling results.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a single resistance sampling method widely used in the field of motor control. Background technique [0002] According to statistics, 60% of the world's electricity consumption comes from motors, and motor control is a diverse and broad application market. Usually, in order to be able to collect the phase current of the motor, we use the 3-resistor collection method, that is, connect 3 sampling resistors in series with the 3 lower bridge arms of the 3-phase bridge circuit, and use the zero-vector area of ​​SVPWM (Space Vector PWM) The 3-phase current of the motor is obtained by the freewheeling effect of the lower bridge arm in the first stage. In order to amplify the current while suppressing the switching noise of the current, each sampling resistor requires an operational amplifier in the subsequent stage. Then a total of 3 sampling resistors and 3 operational amplifiers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25H02P23/00
CPCG01R19/25H02P23/00H02P2205/01
Inventor 钟成保
Owner 四川中微芯成科技有限公司
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