Air conditioning circuit and multi-split system

An air conditioning circuit comprising:

• an outdoor unit circuit, including an outdoor unit power supply circuit;
• a carrier communication cable, connected to an output terminal of the outdoor unit power supply circuit;
• and
• an indoor unit circuit, including:
• a power supply input terminal;
• a switching device, a control terminal of the switching device being connected to the carrier communication cable;
• an indoor unit power supply circuit configured to obtain power from the power supply input terminal through the switching device;
• and
• a wired controller circuit connected to the carrier communication cable, the wired controller circuit including a standby switch connected to the carrier communication cable and configured to, in response to being closed, trigger an overload protection function of the outdoor unit power supply circuit through the carrier communication cable.

A multi-split system comprising:

• an inner unit;
• an outer unit;
• and
• an air conditioning circuit including:
• an outdoor unit circuit provided at the outer unit and including an outdoor unit power supply circuit;
• a carrier communication cable, connected to an output terminal of the outdoor unit power supply circuit;
• and
• an indoor unit circuit provided at the inner unit and including:
• a power supply input terminal;
• a switching device, a control terminal of the switching device being connected to the carrier communication cable;
• an indoor unit power supply circuit configured to obtain power from the power supply input terminal through the switching device;
• and
• a wired controller circuit connected to the carrier communication cable, the wired controller circuit including a standby switch connected to the carrier communication cable and configured to, in response to being closed, trigger an overload protection function of the outdoor unit power supply circuit through the carrier communication cable.