Frequency conversion circuit with interlaced mode full PAM control mode and deviation inhibition method thereof

Abstract

The present invention discloses a frequency conversion circuit with an interlaced mode full PAM control mode and a deviation inhibition method thereof. A rectifier bridge, a first boost chopper circuit, a second boost chopper circuit, a capacitor, a microcontroller and an intelligent power modulation module are arranged to form a frequency conversion circuit with an interlaced mode full PAM control mode. According to the invention, after an alternating current power supply is switched on or prior to requiring starting an air conditioner compressor, the microcontroller regulates the on-off time of the first insulated gate bipolar transistor in the first boost chopper circuit and the second insulated gate bipolar transistor in the second boost chopper circuit according to the size of the obtained voltage at two ends of the capacitor to ensure that the loop voltage is effectively reduced to generate ripple even though the inductance values of a first electric reactor in the first boost chopper circuit and a second electric reactor in the second boost chopper circuit are different. The frequency conversion circuit with the interlaced mode full PAM control mode and the deviation inhibition method thereof can ensure that the voltage inputted to the compressor is stable so as to reduce the compressor noise and the vibration, can avoid the current distortion and reduce the generation of the harmonic wave.

Description

Technical field [0001] The invention relates to the field of frequency conversion air conditioning circuit design, and specifically to a frequency conversion circuit with a staggered mode full PAM control method and a deviation suppression method thereof. Background technique [0002] The frequency conversion circuit used in air conditioners in the existing technology uses a diode module to rectify AC voltage into DC voltage, a smoothing capacitor to smooth the DC waveform, and an intelligent power modulation module to convert the DC voltage into an analog AC voltage again to drive the compressor. . However, it is difficult for the existing frequency conversion circuit to meet the IEC harmonic current standards (International Electrotechnical Commission, International Electrotechnical Commission). Since harmonics are generated in the input current waveform, the power factor will be reduced. In the prior art, active filters are generally used to avoid the above situation. H...

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Problems solved by technology

However, it is difficult for the frequency conversion circuit of the prior art to meet the IEC harmonic current standard (International Electrotechnical Commission, International Electrotechnical Commission)

The power factor will be degraded due to the generation of harmonics in the input current waveform

In the prior art, the method of active filter is generally used to avoid the above situation, but the energy loss of the method of active filter is relatively large, resulting in the phenomenon of low working efficiency.

In the prior art, a step-up chopper circuit is also used to increase the synchronous one-time switching and the zero crossing of the waveform, so that the harmonics are suppressed and the input current waveform is improved. This loop is called a PAM loop; but due to the two The inductance of an inductor has a tolerance range, generally ±10%; at the same time, if Image 6 As shown, although Q1 and Q2 are alternately turned on at the same time in the prior art, there is always a deviation in the inductance of the two reactors, which causes ripples in the main circuit voltage, so that the input to the compressor Unstable voltage, causing compressor noise and vibration

In addition, it will cause primary current distortion and increase of harmonics, resulting in unqualified harmonic current evaluation in EMC evaluation

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