Three-phase electronic control unit for enclosure air conditioners

A microcontroller of a three-phase electronic control unit (ECU), the microcontroller configured to:

• receive, from a rectifier circuit of the three-phase ECU, an input direct current (DC) power source, the input DC power source produced from three-phase alternating current (AC) input power;
• receive a plurality of phase signals corresponding to the three-phase AC input power from a phase detection circuit, wherein the phase detection circuit is configured to:
• receive the DC power source from the rectifier circuit of the three-phase ECU;
• produce, from the DC power source, a reference voltage;
• and
• compare the reference voltage to at least one phase of the plurality of phases;
• determine one or more command signals based at least in part on the plurality of phase signals, the one or more command signals configured to selectively activate a plurality of relays of the three-phase ECU;
• and
• provide the one or more command signals to a phase correction circuit of the three-phase ECU.

A method for controlling one or more three-phase components for a three-phase air conditioning system, the method comprising:

• receiving, via an electronic control unit (ECU), a plurality of phases of an alternating current (AC) input power from a three-phase AC power supply;
• producing, via the ECU, direct current (DC) output power from the AC input power;
• generating a reference voltage from the DC output power,
• comparing the reference voltage to the plurality of phases of the three-phase AC power supply to produce a plurality of phase sequence signals;
• determining a phase order based on the plurality of phase sequence signals;
• and
• selectively activating a plurality of relays of the ECU to provide a corrected plurality of phases for operating the one or more three-phase components, the corrected plurality of phases being based at least in part on the phase order of the plurality of phases.