Non-polar two-line system communication circuit

Abstract

The invention discloses a non-polar two-line system communication circuit which aims to solve the technical problem of preventing the occurrence of errors in the process of connection. The invention adopts the following technical scheme: a non-polar two-line system communication circuit comprises a host terminal and a slave terminal, wherein the host terminal is connected with the slave terminal and controls the slave terminal, the inside of the host terminal is provided with a host-terminal sending and receiving line module, the inside of the slave terminal is provided with a slave-terminal sending and receiving line module, and the host-terminal sending and receiving line module is connected with the slave-terminal sending and receiving line module in a non-polar two-line system connection mode. Compared with the prior art, an indoor unit controller for air conditioners supplies power for a temperature control device for air conditioners and carries out communication with the temperature control device by a power line, and the connection mode is a non-polar connection mode; and two lines can simultaneously carry out power supply and communication, thereby solving the problem that two lines simultaneously supply power and transmit signals, and reducing the demands on leads and installation.

Description

technical field [0001] The invention relates to a household appliance, in particular to a communication circuit of the household appliance. Background technique [0002] At present, for some bus communication commonly used in engineering, such as RS485, CAN, or other TTL communication methods, the communication line and power line are often set separately, that is, two lines cannot be used for power supply and communication at the same time. However, due to the limitation of cost, the application is greatly limited. The thermostat of the air conditioner needs to communicate with the indoor unit, and also needs to be powered by the indoor unit. The prior art uses two power lines for power supply. like figure 1 As shown, in the traditional four-wire communication connection mode, the master end of the air conditioner and the slave end of the air conditioner use two communication lines for communication between the master end and the slave end, and the master end uses two pow...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, in the traditional four-wire communication connection mode, the master end of the air conditioner and the slave end of the air conditioner use two communication lines for communication between the master end and the slave end, and the master end uses two power supply wires for the slave end. Terminal power supply, such a structure makes the first cost is high, and the second is frequent wiring errors, resulting in damage to the master and slave components

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