PWM convertor circuit and frequency converter comprising same
A frequency converter and converter technology, which is applied in the direction of AC network circuits, circuit devices, electrical components, etc., can solve the problems of high cost, short battery life, high replacement and maintenance costs, etc., and achieve the effect of high cost performance and perfect functions
Active Publication Date: 2016-05-18
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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Problems solved by technology
As the only lifeline, the battery cannot play a "life-saving" role at critical moments
In addition, the life of the battery is short, the average life is generally only 2-3 years, the cost of replacement and maintenance is high, and it occupies a large volume
If other energy storage materials such as supercapacitors are used, the cost will be higher
Method used
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[0027] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings.
[0028] Such as figure 1 As shown, a PWM converter circuit, the circuit includes:
[0029] AC input and DC output;
[0030] The PWM converter 22 electrically connected between the AC input terminal and the DC output terminal also includes: a three-phase reactor 21, a first DC support capacitor 23 and a semiconductor switch 24; the input terminal of the three-phase reactor 21 is connected to the AC power The input terminal is connected, the output terminal of the three-phase reactor 21 is connected with the input terminal of the PWM converter 22; the two ends of the first DC support capacitor 23 are connected in parallel with the output terminal of the PWM converter 22; the semiconductor switch 24 is connected in series Between the positive pole of the PWM converter 22 output terminal and ...
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The invention discloses a PWM convertor circuit and a frequency converter comprising same. The PWM convertor circuit comprises an AC power input end and a DC power output end; and a PWM converter which is electrically connected between the AC power input end and the DC power output end. The PWM convertor circuit and the frequency converter are used for frequency converter undervoltage protection stoppage treatment when voltage dip occurs in an electric power system so that the frequency converter has a low-voltage ride-through capability. Furthermore when the voltage of a power grid is normal, a reactive power compensation function and a harmonic suppression function can be realized, and furthermore pollution of the frequency converter to the power grid is eliminated.
Description
technical field [0001] The invention relates to a frequency converter low-voltage shutdown protection and a power quality control circuit of the frequency converter. More specifically, it relates to a PWM converter circuit and a frequency converter including the circuit. Background technique [0002] Frequency converters are widely used in industrial production because of their excellent speed regulation performance and remarkable energy-saving effect. However, due to the unavoidable phenomenon of voltage sag in the power grid, the inverter often has shutdown protection problems during use, which in turn causes the driven motor to stop running. With the continuous improvement of the degree of industrialization, the production process is often automated and continuous production, and the various technological processes are closely coordinated and coordinated with each other. As long as one of the equipment is shut down for protection, it will cause disorder in the production...
Claims
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Login to View More IPC IPC(8): H02M1/32H02J3/18H02J3/01
CPCH02J3/01H02J3/1821H02M1/32Y02E40/30Y02E40/40
Inventor 黄胜利韩润萍周灵霄宋凌云王永忠王妍萍马小铁
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY