Monocycle pulse width modulation (PWM) method and modulator for power factor correction
A power factor correction, single-cycle technology, used in output power conversion devices, irreversible AC power input conversion to DC power output, high-efficiency power electronic conversion and other directions, can solve the effect of power factor correction and other issues.
Active Publication Date: 2012-08-01
WUHAN YONGLI TECH CO LTD
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Problems solved by technology
[0005] In order to solve the problems existing in the existing single-cycle power factor correction technology PWM modulator, that is, the effect of power factor correction is caused by the fact that its operating frequency must match the integration parameters of the integrator and the adverse effects brought by the temperature characteristic factors of components. Greatly affected defects, the present invention proposes a single-cycle PWM modulation method and modulator for power factor correction
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[0031] In order to solve the problems existing in the implementation scheme of the existing single-cycle power factor correction technology PWM modulator, firstly analyze the implementation scheme of the existing single-phase single-cycle power factor correction technology PWM modulator, please refer to figure 2 .
[0032] The implementation scheme of the existing single-phase single-cycle power factor correction technology PWM modulator is: after the output voltage is sampled, it is sent to the error amplifier together with the reference reference voltage, and the output of the error amplifier is sent to the subtractor as the input of the integrator at the same time; The clock pulse signal is sent to the reset terminal of the integrator and sent to the S terminal of the RS flip-flop at the same time. The integrator and the reset clock signal generator form the function of the sawtooth wave generator; the output of the subtractor is sent to the comparator and the control refer...
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The invention provides a monocycle pulse width modulation (PWM) method for power factor correction. The method comprises the following steps of: amplifying a voltage error between sampled voltage and reference voltage; integrating and regularly resetting the amplified voltage error to obtain sawtooth voltage; performing inverting operation on the sawtooth voltage by taking the average level of the sawtooth voltage as a reference level to obtain sawtooth waves, wherein the sawtooth waves take sawtooth wave peak amplitude as a bottom, teeth of the sawtooth waves are downward, and tooth tops of the sawtooth waves reach zero; and comparing the sawtooth waves with a control reference quantity to obtain required pulse width modulated waves. The invention also provides a monocycle pulse width modulator (PWM) for the power factor correction. The monocycle PWM comprises an error amplifier, an integrator, a resetting clock signal generator, a comparator and a low-pass filter. The average level of the sawtooth voltage is taken as the reference level, so that the PWM can work at any required frequency without taking the matching of integration parameters of the integrator, and the influence of temperature characteristics of components is completely avoided.
Description
technical field [0001] The invention relates to the field of AC-DC converters of electric energy conversion devices, in particular to a single-cycle PWM modulation method and modulator for power factor correction. Background technique [0002] With the wide application of power electronics technology, the hazards of grid harmonic pollution have attracted more and more attention, and the requirements for input power factor (PF) and input current total harmonic distortion (THD) of power conversion devices are also increasing. high. Therefore, the power factor correction technology of electrical equipment has always been a subject of great concern in the industry. Single-cycle technology is a nonlinear large-signal PWM control technology developed in the 1990s. By controlling the duty cycle of the switch, the average value of the switching variable in each switching cycle is proportional to the control reference. Applying single-cycle control technology to power factor correc...
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Login to View More IPC IPC(8): H02M7/12H02M1/42
CPCY02B70/126Y02B70/10
Inventor 张黎明林杰谢波
Owner WUHAN YONGLI TECH CO LTD