Current loop communication circuit and air conditioner

Abstract

The invention discloses a current loop communication circuit and an air conditioner. The current loop communication circuit comprises a first communication circuit and a second communication circuit, wherein the first communication circuit and the second communication circuit share a null line N; the first communication circuit and the second communication circuit are connected with a communication S line for communication; a discharge circuit is arranged between the communication S line and the null line N; and the discharge circuit eliminates parasitic capacitance generated between the communication S line and the null line N. According to the current loop communication circuit and the air conditioner provided by the invention, when the first communication circuit and the second communication circuit are connected, high-level signal transmission between the first communication circuit and the second communication circuit is realized; and when the first communication circuit sends a low-level signal to the second communication circuit, the parasitic capacitance is eliminated, the limitation of the current loop communication circuit on the length of a connecting line is reduced, and the communication distance is increased. Meanwhile, when the second communication circuit sends a low-level signal to the first communication circuit, a power supply boost control method is adopted, the communication S-line voltage is pulled up to the power supply voltage, and the stability of the communication S-line voltage is ensured.

Description

technical field [0001] The invention relates to the communication field, in particular to a current loop communication circuit and an air conditioner. Background technique [0002] At present, the communication between the indoor unit and the outdoor unit of the household air conditioner is generally realized by a current loop communication circuit, and the current loop communication is realized through three wires, namely, the live wire L of the AC power supply, the neutral wire N, and a communication S wire. The indoor unit part and the outdoor unit part form a current loop communication circuit through the live line L, the neutral line N, and the communication S line to realize the communication between the air conditioner indoor unit and the outdoor unit. The entire communication circuit has few connection lines and low cost. [0003] Among them, the current loop communication needs to share the neutral line N with the power circuit, and in the actual installation and u...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem of the short distance between the communication lines caused by the parasitic capacitance when the power line and the communication line run in parallel in the prior art, the present invention proposes a current loop communication circuit and an air conditioner

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