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MXZ MICROPROCESSOR CONTROL
MXZ-A•NA
3-1. INVERTER SYSTEM CONTROL
3-1-1. Inverter main power supply circuit
REACTOR
POWER | NOISE | RESISTOR |
FILTER |
| |
SUPPLY |
| |
CIRCUIT |
| |
|
| |
|
| RELAY |
PFC
|
| CURRENT | |
|
| TRANSFORMER | |
P | U | U | |
+ SMOOTHING | V | MS | |
CAPACITOR | V 3~ | ||
| |||
N | W | W | |
IPM | |||
COMPRESSOR | |||
Function of main parts
NAME | FUNCTION | |
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| |
INTELLIGENT POWER MODULE (IPM) | It supplies | |
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| |
SMOOTHING CAPACITOR | It stabilizes the DC voltage and supplies it to IPM. | |
|
| |
CURRENT TRANSFORMER | It measures the current of the compressor motor. | |
It measures the current of the main power supply circuit. | ||
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REACTOR | It rectifies AC, controls its voltage and improves the power factor of power | |
POWER FACTOR CORRECTION MODULE (PFC) | supply. | |
| ||
|
| |
RESISTOR | It restricts rush current with the resistance. | |
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| |
RELAY | It | |
sor operates. | ||
|
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 are placed in sub circuit.
2.At normal operation
When AC runs into noise filter P.C. board, its external noise is eliminated in NOISE FILTER CIRCUIT.
After noise being eliminated from AC, it is rectified to DC by REACTOR and PFC. If the operating frequency becomes 25 Hz or more, DC voltage rises to 370 V.
DC voltage, to which has AC been rectified by process 
, is stabilized by SMOOTHING CAPACITOR and supplied to IPM.
The DC (Bus voltage), which has been stabilized in process 
, is converted to
COMPRESSOR.
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.
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