| 摘要 |
PURPOSE: An inverter driving device for a multi air conditioner system is provided to precisely detect a current flowing to a load without any delay and compare the current value with a reference value of an overload, thereby preventing the damage caused by the malfunction due to the overload. CONSTITUTION: An inverter driving device for a multi air conditioner system includes an input filter circuit(100) for filtering 3-phase AC power to remove noise, and a rectifying/smoothing circuit(101) for rectifying and smoothing the 3-phase AC power to output a DC link voltage. An inverter driving/switching circuit(102) varies the DC link voltage by a pulse width modulation control signal output from a microcomputer(104), thereby outputting the 3-phase AC power. A load current sensing circuit(103) senses a load current between the input filter circuit and the rectifying/smoothing circuit. A reverse/open phase sensing circuit(105) senses reverse/open phases of the 3-phase AC power. An electronic switch(SW1) switches the 3-phase AC power between the input filter circuit and the rectifying/smoothing circuit according to a relay driving signal. A high pressure switch(SW2) and a power relay switch(SW3) block the power by high pressure generating/relay driving signals in the case of overload. A relay driving circuit(106) turns on/off the switches by a driving signal of the microcomputer.
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