Motor driving device and air conditioner including the same

An air conditioner comprising:

• a compressor to compress a refrigerant;
• a heat exchanger to perform heat exchange, using the compressed refrigerant;
• and
• a compressor motor driving device to drive a motor equipped in the compressor, wherein the compressor motor driving device includes
• a rectifier having a plurality of diodes coupled in at least one of serially or parallel;
• a plurality of transistors to control an operation of the plurality of diodes;
• a plurality of capacitors to store energy based an output of the rectifier;
• and
• a gate drive signal generator to generate gate drive signals for the transistors, wherein the gate drive signal generator includes:
• a gate driver to generate gate drive signals based on a gate drive voltage,
• a gate capacitor coupled to both terminals of the gate driver,
• a switch coupled between one terminal of the gate capacitor and one of the plurality of capacitors;
• and
• a diode and a resistor connected between another terminal of the gate capacitor and a terminal of the gate drive power source,
• wherein the diode prevents backflow of a current to the gate drive power source, and
• wherein one terminal of one of the plurality of capacitors is floated, and the one terminal of one of the plurality of capacitors is connected electrically to one terminal of the switch.

A motor driving device comprising:

• an AC/DC converter;
• a plurality of capacitors to store energy based on an output from the AC/DC converter;
• and
• a converter controller to control the operation of the AC/DC converter,
• wherein the converter controller includes:
• a switch connected to a floated terminal of one of the plurality of capacitors,
• a gate capacitor for storing energy based on a gate drive voltage,
• a gate driver to generate the gate drive signals, using the energy stored in the gate capacitor, and
• a diode and a resistor connected between a terminal of the gate capacitor and a terminal of the gate drive power source,
• wherein the diode prevents backflow of a current to the gate drive power source, and
• wherein the floated terminal of one of the plurality of capacitors is connected electrically to one terminal of the switch.