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Method for improving output accuracy of counter type digital pulse width modulator

A digital pulse width modulation and counter technology, applied in the electronic field, can solve the problems of precision and speed contradictions, and achieve the effect of meeting the requirements of precision and speed, strong versatility and applicability

Inactive Publication Date: 2018-01-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The invention provides a method for improving the output precision of a counter-type digital pulse width modulator to solve the problem of contradiction between precision and speed

Method used

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  • Method for improving output accuracy of counter type digital pulse width modulator
  • Method for improving output accuracy of counter type digital pulse width modulator

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Embodiment Construction

[0016] The present invention will be described in further detail below with reference to the drawings. Such as figure 1 As shown, the counter-type digital pulse width modulator using the method provided by the present invention improves the effective output accuracy by adding a frequency division clock cycle width module. The specific implementation process will be combined figure 2 Be explained. figure 2 In order to use the method for improving the output precision of the counter-type digital pulse width modulator provided by the present invention, the digital pulse width signal is improved by 3 effective bits of the waveform output process. The process includes the following steps:

[0017] First, determine the frequency division clock cycle width, the PWM cycle value, and the duty cycle value input to the counter-type digital pulse width modulator. figure 2 The medium duty cycle value is 50%, that is, the high-level wave and the low-level wave in the output PWM wave each...

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Abstract

The invention discloses a method for improving output accuracy of a counter type digital pulse width modulator. The method comprises the following steps: taking 2N pulse width modulation (PWM) waveforms with the same duty cycle output by a digital pulse width modulator as a group, and gradually adding a frequency division clock cycle width to partial pulses in each group of the waveforms in a controlled mode. Thereby, the effective output accuracy controlled by the digital pulse width modulator can be improved by N bits without increasing the frequency of a frequency division clock. The methoddisclosed by the invention is suitable for fast feedback control of a time delay system, ensures that the requirements of accuracy and speed can be simultaneously met in case that the frequency division clock of the pulse width modulator cannot be increased, and has stronger generality and applicability.

Description

Technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a method for improving the output accuracy of a counter type digital pulse width modulator. Background technique [0002] Digital pulse width modulators are widely used in the field of hysteresis systems such as thermoelectric cooler drives due to their flexible control, fast response speed, and high efficiency. The PWM wave output by the digital pulse width modulator controls the on and off of the main circuit driven by the thermoelectric cooler, and plays a role in regulating the output voltage of the main circuit. Therefore, the output accuracy of the digital pulse width modulator directly determines the steady state of the main circuit output voltage Accuracy. That is to say, in the thermoelectric cooler drive, the output precision of the digital pulse width modulator determines the control precision of the thermoelectric cooler, and affects the accuracy of the fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K7/08
Inventor 董晓舟贾远征
Owner SHANDONG UNIV
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