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Sigma delta type ADC current sampling control method and device

A current sampling and control method technology, which is applied in the control of electromechanical transmission devices, motor generator control, electronic commutation motor control, etc., can solve the problems of PWM switching noise interference, complex tune-out circuits, and low precision, and achieve reduction effect of influence

Pending Publication Date: 2021-11-26
上海新纪元机器人有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional motor control current isolation sampling scheme, both the isolation operational amplifier scheme and the Hall sampling scheme have the problems of low precision and complicated tune-off circuit, while the isolated Σ-Δ current sampling scheme just makes up for the shortcomings of the traditional scheme
[0003] In the Σ-Δ current sampling scheme, the data stream output by the Σ-Δ modulator needs to be filtered and processed in the DSP / FPGA. Compared with the traditional SAR ADC sampling, the entire sampling system handles the continuous operation state, and the current sampling result is easy Interfering with the introduction of PWM switching noise

Method used

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  • Sigma delta type ADC current sampling control method and device
  • Sigma delta type ADC current sampling control method and device
  • Sigma delta type ADC current sampling control method and device

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Embodiment 1

[0059] An embodiment of the present invention, a ΣΔ ADC current sampling control method, such as figure 1 shown, including:

[0060] S100 generates a PWM synchronous signal based on the PWM switch.

[0061] Specifically, the synchronous signal generated by PWM is used to generate the enable control signal of the post-stage data filter (SINC filter) of the Σ-ΔADC.

[0062] S200 Using the PWM period of the PWM synchronization signal and the structural parameters corresponding to the filters of different orders, calculate the delay time of the filter enable signals corresponding to the filters of different orders, so as to generate the corresponding filter enable signals.

[0063] In this embodiment, the filter enable signal is used to switch the continuous operation mode to the intermittent operation model, and the phase is adjusted to avoid the moment after the PWM is turned on, reducing the influence of the system PWM switching noise on the current sampling

[0064] S300 con...

Embodiment 2

[0069] Based on the above-mentioned embodiment, the parts that are the same as those in the above-mentioned embodiment in this embodiment will not be repeated one by one. This embodiment provides a ΣΔ ADC current sampling control method, which specifically includes:

[0070] S100 generates a PWM synchronous signal based on the PWM switch.

[0071] Specifically, the synchronous signal generated by PWM is used to generate the enable control signal of the post-stage data filter (SINC filter) of the Σ-ΔADC.

[0072] In step S200, the delay time of the filter enable signal corresponding to the filter of different order is calculated by using the PWM period of the PWM synchronization signal and the structural parameters corresponding to the filter of different order to generate the corresponding filter enable signal. capable signals, including:

[0073] The rising edge signal and falling edge signal of the PWM synchronous signal are extracted to generate a first pulse signal and a ...

Embodiment 3

[0103] Based on the above-mentioned embodiment, the parts that are the same as those in the above-mentioned embodiment in this embodiment will not be repeated one by one. This embodiment provides a ΣΔ ADC current sampling control device, such as figure 2 , 5 shown, including:

[0104] PWM synchronous signal generation module 100, for generating PWM synchronous signal based on PWM switch;

[0105] The filter enable signal module 200 is used to calculate the delay time of the filter enable signal corresponding to the filter of the different order by using the PWM period of the PWM synchronous signal and the structural parameters corresponding to the filters of different orders, to generate a corresponding filter enable signal;

[0106] The sampling module 300 is configured to control the corresponding filter to start and stop through the filter enable signal, so as to control the ΣΔ ADC to perform current sampling.

[0107] Preferably, the filtering enable signal module is a...

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Abstract

The invention relates to the technical field of servo motor control, and provides a sigma delta type ADC current sampling control method and device. The method comprises the steps: generating a PWM synchronization signal based on a PWM switch; calculating the delay time of filtering enable signals corresponding to filters with different orders by using the PWM period of the PWM synchronization signal and structure parameters corresponding to the filters with the different orders so as to generate corresponding filtering enable signals; and controlling a corresponding filter to start and stop through the filtering enable signals so as to control the sigma delta type ADC to carry out current sampling. Through the synchronization signal generated by PWM, the enable control signal of a sigma-delta ADC post-stage data filter (SINC filter) is generated by using the synchronization signal, and a continuous operation mode is switched into a discontinuous operation mode; and the influence of system PWM switching noise on current sampling is reduced by avoiding the moment after PWM is turned on by adjusting a phase.

Description

technical field [0001] The invention relates to the technical field of servo motor control, in particular to a ΣΔ ADC current sampling control method and device. Background technique [0002] In the servo control system, the FOC field-oriented control method is usually adopted, so the control system needs to collect the phase current of the motor. In order to improve the reliability of the control system, it is necessary to isolate the control system and the high-voltage drive system of the motor. In the traditional motor control current isolation sampling scheme, both the isolation operational amplifier scheme and the Hall sampling scheme have the problems of low precision and complex tune-off circuit, and the isolated Σ-Δ current sampling scheme just makes up for the shortcomings of the traditional scheme. [0003] In the Σ-Δ current sampling scheme, the data stream output by the Σ-Δ modulator needs to be filtered and processed in the DSP / FPGA. Compared with the tradition...

Claims

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Application Information

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IPC IPC(8): G01R19/25H02P21/14H02P21/22
CPCG01R19/25H02P21/14H02P21/22
Inventor 廖靖邱应辉胡景晨
Owner 上海新纪元机器人有限公司