Parabola method current tracking pulse width modulation controller

A current tracking and pulse width modulation technology, applied in electrical components, irreversible DC power input into AC power output, output power conversion devices, etc. Larger and other problems, to achieve the effect of easy integration

Inactive Publication Date: 2005-07-06
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biggest advantage of triangular wave compared to PWM current control is that it has a fixed switching frequency, but the system response is limited by its current feedback stability and is easily affected by load parameters.
However, the traditional hysteresis control will cause a large change in the switching frequency due to its fixed hysteresis bandwidth, which also limits its application.
In order to overcome this shortcoming, various current control schemes with variable hysteresis loops have been proposed successively, such as phase-locked loop (PLL) fixed-frequency control, adaptive hystere...

Method used

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  • Parabola method current tracking pulse width modulation controller
  • Parabola method current tracking pulse width modulation controller
  • Parabola method current tracking pulse width modulation controller

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Embodiment Construction

[0040] figure 1 It is the first structural principle diagram of the present invention. When the PWM converter is used as an inverter power supply or UPS, etc., the power supply or load 1 with terminal voltage e is a load with a parallel filter capacitor; when it is used as a power active filter, reactive power compensator or high-performance rectifier, etc., The power supply or load 1 whose terminal voltage is e is the power supply; when used as a motor driver, the power supply or load 1 is a motor, and e is its counter electromotive force. In the figure, the PWM switch 3 of the main circuit is connected to the power supply or the load 1 through the inductor 2 . The controlled current i(t) and its command current i ref (t) After being subtracted by the adder 8, the current tracking error Δi(t) is obtained, which is used as the inverting input V of the comparator 10 in- . The conversion of the PWM switch 3 is controlled by the output V1 of the comparator 10. When V1 is at a...

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Abstract

This invention provides parabolic method current tracking pulse width modulation controller, which contains parabolic wave generator with reset, analogy phase inverter, comparator, reset signal generator and analog selector, wherein the output signal shape of parabolic wave generator determined by the ratio of time and switch cycle subtracting the square value of said ratio, the analog phase inverter making phase inverting to the output signal of parabolic wave generator, then transmitting the inverted signal with no inverted signal to analog selector to be selected one from two signal, transmitting to input of comparator whose first way output controlling action signal of main circuit switch, second way controlling analog selector and third way used as input of reset signal generator. Said invented controller is easily integrated, capable of making the output current of pulse width modulation inverter continuous tracking instruction current value and keeping switch frequency basically constant.

Description

(1) Technical field [0001] The invention relates to a current tracking PWM controller. It is suitable for current tracking control of various voltage-type pulse-width modulation (pulse-width modulation, PWM for short) converters. (2) Background technology [0002] For voltage-type PWM converters with high dynamic performance requirements, such as motor drives, power active filters (APF), power factor correctors (PFC) and UPS, etc., current tracking direct control is most suitable. Current control can be achieved by methods such as triangular wave comparison or hysteresis control. The biggest advantage of triangular wave compared to PWM current control is that it has a fixed switching frequency, but the system response is limited by the stability of its current feedback and is easily affected by load parameters. The advantage of the hysteresis control PWM method is that it has no stability problem, is simple and easy to implement, has a fast response speed, and has the abil...

Claims

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Application Information

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IPC IPC(8): H02M1/08
Inventor 王广柱
Owner SHANDONG UNIV
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