An outdoor unit of an air conditioner includes a compressor that compresses a first refrigerant introduced from an indoor unit of the air conditioner and a condenser that condenses the first refrigerant compressed by the compressor. A first driving circuit drives the compressor and a second driving circuit regulates a voltage of the first driving circuit. A cooling unit includes: a heat dissipation member that comes into thermal contact with the first driving circuit and the second driving circuit, and a refrigerant pipe that is provided in the heat dissipation member, and has a path along which a second refrigerant moves through the first driving circuit and the second driving circuit. As a result, it is possible to efficiently cool the first driving circuit and the second driving circuit.

An outdoor unit of an air conditioner includes a compressor that compresses a first refrigerant introduced from an indoor unit of the air conditioner and a condenser that condenses the first refrigerant compressed by the compressor. A first driving circuit drives the compressor and a second driving circuit regulates a voltage of the first driving circuit. A cooling unit includes: a heat dissipation member that comes into thermal contact with the first driving circuit and the second driving circuit, and a refrigerant pipe that is provided in the heat dissipation member, and has a path along which a second refrigerant moves through the first driving circuit and the second driving circuit. As a result, it is possible to efficiently cool the first driving circuit and the second driving circuit.

An outdoor unit includes a group information manager that manages group information relating to a group corresponding to the outdoor unit, the group information being set by a user, a group information transmitter that transmits the group information to a management device, a transfer destination address manager that manages, as a transfer destination address, an address of another outdoor unit that corresponds to a same group as the group corresponding the outdoor unit, the address being received from the management device, a command transferer that transfers, when a destination of a received first operation command is not any of indoor units connected to the outdoor unit, the first operation command to another outdoor unit indicated by a transfer destination address, and transfers, when a destination of a received second operation command is any of the indoor units connected to the outdoor unit, the second operation command to the indoor unit.

An outdoor unit includes a group information manager that manages group information relating to a group corresponding to the outdoor unit, the group information being set by a user, a group information transmitter that transmits the group information to a management device, a transfer destination address manager that manages, as a transfer destination address, an address of another outdoor unit that corresponds to a same group as the group corresponding the outdoor unit, the address being received from the management device, a command transferer that transfers, when a destination of a received first operation command is not any of indoor units connected to the outdoor unit, the first operation command to another outdoor unit indicated by a transfer destination address, and transfers, when a destination of a received second operation command is any of the indoor units connected to the outdoor unit, the second operation command to the indoor unit.

An air conditioner outdoor unit includes a power supply circuit, a load circuit and a main controller. The power supply circuit includes a resistor and a relay connected in parallel. The load circuit includes a plurality of sub-load circuits coupled to an output of the power supply circuit. The main controller is coupled to the relay, and in a case where the air conditioner outdoor unit is in a standby state, the main controller is configured to control the relay to turn off; and in a case where the air conditioner outdoor unit is in a working state, the main controller is configured to control the relay to turn on.

An air conditioner outdoor unit includes a power supply circuit, a load circuit and a main controller. The power supply circuit includes a resistor and a relay connected in parallel. The load circuit includes a plurality of sub-load circuits coupled to an output of the power supply circuit. The main controller is coupled to the relay, and in a case where the air conditioner outdoor unit is in a standby state, the main controller is configured to control the relay to turn off; and in a case where the air conditioner outdoor unit is in a working state, the main controller is configured to control the relay to turn on.

An air-conditioner control system is obtained that includes an air conditioner main body including an air conditioning function, a power-supply circuit unit, a control board mounted with an electronic component including a microcomputer for control, a temperature sensor that measures temperature of the electronic component, and a temperature control unit that heats, during normal operation, on the basis of a measurement value of the temperature sensor, the electronic component such that operation is performed at temperature equal to or higher than a guarantee temperature of the electronic component. Therefore, a target component can always be used within a guarantee temperature range of a manufacturer during normal operation of an air conditioner.

An air-conditioner control system is obtained that includes an air conditioner main body including an air conditioning function, a power-supply circuit unit, a control board mounted with an electronic component including a microcomputer for control, a temperature sensor that measures temperature of the electronic component, and a temperature control unit that heats, during normal operation, on the basis of a measurement value of the temperature sensor, the electronic component such that operation is performed at temperature equal to or higher than a guarantee temperature of the electronic component. Therefore, a target component can always be used within a guarantee temperature range of a manufacturer during normal operation of an air conditioner.

A communication circuit for indoor and outdoor units of an air conditioner and an air conditioner. The circuit includes an outdoor unit sending module, an outdoor unit receiving module, an indoor unit receiving module, an indoor unit sending module, a weak electricity grounding end and a voltage regulation rectifying circuit, wherein the voltage regulation rectifying circuit, the outdoor unit receiving module, the outdoor unit sending module, the indoor unit receiving module, the indoor unit sending module and the weak electricity grounding end are sequentially connected in series to form a loop; the voltage regulation rectifying circuit is configured to convert alternating current of a main control board of an indoor unit into direct current, and supply electricity to the loop.

A communication circuit for indoor and outdoor units of an air conditioner and an air conditioner. The circuit includes an outdoor unit sending module, an outdoor unit receiving module, an indoor unit receiving module, an indoor unit sending module, a weak electricity grounding end and a voltage regulation rectifying circuit, wherein the voltage regulation rectifying circuit, the outdoor unit receiving module, the outdoor unit sending module, the indoor unit receiving module, the indoor unit sending module and the weak electricity grounding end are sequentially connected in series to form a loop; the voltage regulation rectifying circuit is configured to convert alternating current of a main control board of an indoor unit into direct current, and supply electricity to the loop.