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Voltage type variable-frequency control system using pulse width modulation synchronous switching

A technology of variable frequency speed regulation and pulse width modulation, which is applied in the control system, electrical components, AC motor control, etc., can solve problems such as output voltage disorder, current impact, and unstable motor operating state, so as to achieve less adjustment parameters and solve current problems. Shock, simple structure effect

Inactive Publication Date: 2009-01-21
北京金自能源科技发展有限公司 +1
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Problems solved by technology

[0007] The traditional synchronous switching method adopts the direct switching method of the carrier ratio when switching the carrier ratio, which will cause the output voltage to be disordered during the switching, resulting in unstable running state of the motor and prone to current shock phenomenon

Method used

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  • Voltage type variable-frequency control system using pulse width modulation synchronous switching
  • Voltage type variable-frequency control system using pulse width modulation synchronous switching
  • Voltage type variable-frequency control system using pulse width modulation synchronous switching

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Embodiment Construction

[0019] figure 1 , Figure 4 , Figure 5 , Figure 7 It is a specific embodiment of the present invention.

[0020] Such as figure 1 As shown, the present invention includes three parts: a control system, a main loop and a speed regulating object. The hardware of the control system is composed of the control board with DSP digital signal processing chip TMS320F2812 as the core, the optical fiber signal transmission board and the power device trigger board, and the software adopts the way of space vector PWM pulse width modulation. The main circuit adopts diode rectification and three-level midpoint clamping inverter topology composed of IPM. The speed regulation object is a 3Kw four-pole asynchronous motor with a rated voltage of 380V.

[0021] Figure 4 It is a structural diagram of the open-loop operation of the control system using the new synchronous switching method system. Get the current carrier ratio given P according to the given output frequency f * , using t...

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Abstract

This invention relates to one voltage transducer speed adjusting system and method of PWM impulse width synchronous switch in electrical electron and alternating drive field, which comprises the following parts: control system main circuit and adjusting subject, wherein, control system hardware is composed of DSP digital signals process chip TMS320F2812 centered control board, fiber signal send board and power part trigger board aiming at space vector PWM impulse width modulation; main circuit adopts diode rectification and reverse topological structure composed of IPM and adjusting subject is of one four electrode asynchronous motor of 3KW and ratio voltage as 380V.

Description

technical field [0001] The invention belongs to the technical field of power electronics and AC transmission, and in particular provides a voltage-type frequency conversion speed regulation system and a method thereof using PWM pulse width modulation for synchronous switching. Background technique [0002] The voltage type frequency conversion speed regulation system generally consists of three parts: the control system, the main circuit and the speed regulation object. The control system is generally a digital control system with a DSP digital signal processing chip as the core; the main circuit is generally a power transmission path composed of power electronic switching devices; the speed regulation object is generally an electromechanical system composed of various motors. The composition of the voltage type frequency conversion speed regulation system is as follows: figure 1 shown. [0003] In the control system, various modulation methods (such as sinusoidal voltage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/08
Inventor 绳伟辉李崇坚朱春毅王成胜段薇赵小坦
Owner 北京金自能源科技发展有限公司
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