At normal operation | Mitsubishi Electronics MU-AWA, MS-AWA, MUZ-ANA

2-7-2. Outline of main power supply circuit MUZ-A09/12/15/17 MUY-A15/17 MUZ-FD

1.At the start of operation

Main power supply circuit is formed when RELAY is turned ON at COMPRESSOR startup. To prevent rush current from running into the circuit when power supply is turned ON, RESISTOR is placed in sub circuit.

2.At normal operation

When AC runs into POWER P.C. board, its external noise is eliminated in NOISE FILTER CIRCUIT.

After noise is eliminated from AC, it is rectiﬁed to DC by DIODE MODULE 1.

DC voltage, to which AC has been rectiﬁed by process , is stabilized by SMOOTHING CAPACITOR and supplied to IPM.

DC voltage, which has been stabilized in process , is converted to three-phase AC by IPM and supplied to COMPRES- SOR.

CURRENT TRANSFORMER, which is placed in the power supply circuit to COMPRESSOR, are used to measure the val- ue of phase current and locate the polar direction of rotor with algorithm. PWM (Pulse width modulation) controls impressed voltage and frequency with those information.

3.Purpose of PAM adoption

PAM : Pulse Amplitude Modulation

PAM has been adopted for the efﬁciency improvement and the adaptation to IEC harmonic current emission standard

Outline of simple partial switching method

In conventional inverter models, DIODE MODULE rectiﬁes AC voltage to DC voltage, SMOOTHING CAPACITOR makes its DC waveform smooth, and IPM converts its DC voltage to imitated AC voltage again in order to drive the compressor motor. However, it has been difficult to meet IEC harmonic current emission standard by above circuit because harmonic gets generated in the input current waveform and power factor gets down. The simple partial switching method with PAM, which has been adopted this time, places and utilizes BOOSTER CHOPPER CIRCUIT before rectifying AC voltage in the general passive-method converter circuit. As harmonic gets suppressed and the peak of waveform gets lower by adding BOOSTER CHOPPER CIRCUIT as mentioned above and by synchronizing the timing of switching with the zero-cross point of waveform, the input current waveform can be improved and the requirement of IEC harmonic current emission standard can be satisﬁed. Since the switching synchronized with the zero cross point, this simple partial switching method has the feature of lower en- ergy loss compared to active ﬁlter method. In addition, output and efﬁciency is enhanced by combining with vector-controlled inverter in order to boost the voltage of power supplied to IPM.

Input current waveform without PAM

Due to the time of no electricity;

·Power factor gets worse.

·Harmonic gets increased.

Input voltage

Input current

Energized time is short in case L inductance is small.

No electricity runs into diode module because the voltage at both sides of smoothing capacitor is higher than input voltage.

Input current waveform with PAM

Owing to the increase of energized time;

·Power factor gets better.

·Harmonic gets suppressed.

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