Communication control device of air conditioner

Abstract

To speed up the communication between the indoor unit and outdoor unit of an air conditioner and suppress the radiant noise by the communication. In the separate type air conditioner comprising the indoor unit 1 having an indoor blower 19, a control system means (including a microcomputer 7, a decoding circuit 9 and a modulating driver 12) and a temperature detection means 18; and the outdoor unit 2 having an outdoor blower 35, a refrigerant compressor 36, a control system means, and a temperature detection means 21, two connecting cables 3 and 4 for supplying AC power and one communication cable 5 for communication are provided between the indoor unit and the outdoor unit, and high frequency transformers 14 and 25 in which both ends of primary windings are connected to one connecting cable 4 and the communication cable 5 are provided on the indoor unit 1 and the outdoor unit 2, respectively. Capacitors 15 and 27 are connected in parallel to the primary windings of the high frequency transformers to form parallel resonance circuits to make an alternating signal to be carried to the communication cable 5 to a sine wave-like waveform close to a sine wave.

Description

technical field [0001] The present invention relates to the technology of a two-way serial communication control device between an indoor unit and an outdoor unit of a split type air conditioner. Background technique [0002] As a general prior art of an air conditioner, in a split-type combination of an indoor unit and an outdoor unit, each is equipped with a control circuit controlled by a microcomputer, and the indoor unit receives the user's operation, stop request and change by remote control. Instructions such as temperature setting, in addition to determining the operating status of the indoor blower, etc., also need to use information from the temperature detection circuit (using a temperature sensor such as a thermistor to detect indoor temperature conditions) to set the rotation speed instruction of the motor for the refrigeration compressor. and the operation requirements for the outdoor blower are transmitted to the outdoor unit. [0003] In addition, the outdoo...

AI Technical Summary

Problems solved by technology

In order to obtain this drive current, a dedicated power supply that rectifies the commercial power and smoothes it with a capacitor, and then uses a Zener diode and a resistor to perform constant voltage is required, which increases the number of parts and hinders energy saving.

In addition, the photocoupler is a semiconductor element with relatively low rated current and rated voltage, and requires a protection circuit against incorrect connection of the indoor unit and outdoor unit connection cable, which also causes the complexity of the circuit and the increase in the number of parts.

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