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A current sampling processing device and a motor driver

A motor driver and current sampling technology, which is applied in the direction of instruments, electrical components, electrical signal transmission systems, etc., can solve the problems of high current sampling value and narrowing of current loop bandwidth, so as to reduce the probability of delay and reduce the narrowing of bandwidth The probability of , the effect of shortening the update interval

Active Publication Date: 2017-04-26
SHANGHAI INVT INDUSTRY TECHNOLOGY CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The applicant found that: during the current loop calculation process of the current motor driver, the probability of a large delay in the current sampling value is very high, resulting in a high probability of narrowing the bandwidth of the current loop

Method used

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  • A current sampling processing device and a motor driver
  • A current sampling processing device and a motor driver
  • A current sampling processing device and a motor driver

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Embodiment Construction

[0027] After the motor driver starts the current loop calculation, it reads the current sampling value closest to the current moment, and uses the current sampling value to perform the current loop calculation. It can be seen that during the current loop calculation process of the motor driver, the delay of the current sampling value mainly includes: the sampling time of the ADC, the decoding time of the CIC decoder (that is, the output update time), and the starting moment of the current loop calculation The time between the moment when the CIC filter outputs the sampled value of the current. When the sampling time of the ADC and the decoding time of the CIC filter remain unchanged, the delay of the current sampling value will mainly depend on the starting moment of the current loop calculation and the current sampling value used in this calculation process is filtered by the CIC The time value between instants output by the controller.

[0028] In the existing motor driver,...

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Abstract

The invention discloses a current sampling processing device which comprises a first filter bank and a current loop calculation circuit. The first filter bank comprises a plurality of CIC filters of the same structure, the CIC filters carry out decoding processing on data streams and output current sampling values at different moments, therefore, the updating time interval of the current sampling values is shortened, the probability that large time delay occurs between the starting time calculated by a current loop and the time for outputting the current sampling values used in the calculation through the CIC filters is lowered, the probability that large time delay happens to the current sampling values in the current loop calculation process is lowered, and the probability that the bandwidth of the current loop is narrowed down is lowered. The invention further discloses a motor driver.

Description

technical field [0001] The invention belongs to the technical field of current sampling, and in particular relates to a current sampling processing device and a motor driver. Background technique [0002] At present, the current sampling scheme of the motor driver is: use a CIC (cascaded integral comb) filter to decode the data stream output by a Sigma Delta ADC (analog-to-digital converter) to obtain the current sampling value. SigmaDelta ADC is also known as Σ-ΔADC. The decimation rate of the CIC filter directly determines its sampling precision. When the decimation rate of the CIC filter is higher, the sampling precision is correspondingly higher. The output update time interval of the CIC filter is related to the sampling rate of the CIC filter. When the sampling rate of the CIC filter is M, the CIC filter outputs the sampling completion flag and the current sampling value every M clock cycles. [0003] Motor drivers usually use the current sampling value output by the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/54
Inventor 陈书贤赵一凡刘小兵
Owner SHANGHAI INVT INDUSTRY TECHNOLOGY CO LTD
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