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Sampling method suitable for digital control of power electronic converter

A digital control, power electronics technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problems of control algorithm deviation, inapplicability, etc. cost, suppressing dead-time effects or the effect of missing pulses

Active Publication Date: 2019-05-14
HANGZHOU LUNTEK TECH
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  • Description
  • Claims
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Problems solved by technology

However, this way of adjusting the sampling time can easily lead to deviations in the control algorithm, which is not applicable to the digital control of power electronic converters

Method used

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  • Sampling method suitable for digital control of power electronic converter
  • Sampling method suitable for digital control of power electronic converter
  • Sampling method suitable for digital control of power electronic converter

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Embodiment Construction

[0023] figure 1 It is an equivalent structure diagram of a closed-loop feedback power electronic converter including multi-frequency digital sampling PWM. Among them, the multi-frequency digital sampling PWM adopts the analog-to-digital conversion method of multiple switching frequencies to sample data. Taking 4 times frequency digital sampling as an example, the traditional 4 times frequency digital sampling PWM such as figure 2 As shown in the figure, the triangular carrier v car If the rising edge of (t) crosses the modulation signal M[k] horizontally, the output PWM will be flipped at a high level; on the contrary, if the falling edge of the triangular carrier crosses the modulation signal horizontally, the output PWM will be low. Flip. because figure 2 The modulated signal shown crosses longitudinally at the rising edge of the triangular carrier, resulting in a dead zone effect that results in the loss of high-level pulses.

[0024] In order to solve this phenomeno...

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Abstract

The invention discloses a sampling method suitable for digital control of a power electronic converter. Due to the fact that a digital sampling zero-order holder exits, output modulated signals of a closed-loop feedback compensator are probably longitudinally crossed with carrier signals to cause a dead-time effect or a pulse loss phenomenon, and thus control stability of a power electronic converter is endangered. In order that decreasing of digital delay and no pulse loss of multi-octave digital sampling are simultaneously ensured, the invention provides a carrier N equipartition technique,so that the multi-octave digital sampling and PWM are conducted, the measure of carrier N equipartition is adopted, the longitudinally crossing of the modulating signals and the carrier signals is automatically recognized, and the phenomenon of the pulse loss is avoided, and the correctness of the multi-octave digital sampling PWN in the application of the power electronic converter is ensured.

Description

technical field [0001] The invention belongs to the technical field of digital control of power electronic switch converters, and specifically designs a sampling method suitable for digital control of power electronic converters. Background technique [0002] With the rapid development of digital processing technology, more and more attention has been paid to the digital control technology of power electronic converters. The digital control of the power electronic converter needs to collect the power signal first, convert it into a digital signal through analog-to-digital conversion (ADC), and then perform digital-to-analog conversion (DAC), feedback control and pulse output of the signal in the digital processing unit. Generally, the conversion period of the ADC can be synchronized with the digital carrier period of the pulse width modulation, that is, the period of the digital sampling of the signal is synchronized with the switching period. The biggest advantage of this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5395
Inventor 何远彬杭丽君彭宇奇
Owner HANGZHOU LUNTEK TECH
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