Five-in-one intelligent digital general air conditioner protector

Abstract

The invention relates to a five in one intelligent digital universal air conditioner protector in particular, which includes a power circuit, a defrosting detecting circuit consisting of temperature collection and overcurrent sampling, an overcurrent protection circuit, a phase sequence detecting circuit, a communication circuit and a display debug circuit respectively connected with an SCM; the phase sequence detecting circuit includes photocouplers IC4, IC5 and IC6; three needles of a temperature sensor are respectively connected with three phases of the power; a diode D19 and a resistance R39 are connected in series with the photocoupler IC6; simultaneously the photocouplers IC4, IC5 and IC6 are respectively connected with pull-up resistances R36, R35 as well as R34 and then connected in series with the SCM ICI through pull-up resistances R26, R27 as well as R28; the invention can not only better solve the defects of a three in one board through the collection, analysis and re-control of data, but also realize the intellectualization, digitization and unification of the board; meanwhile, the maintenance cost after sales is reduced; the product quality is improved.

Description

Technical field: [0001] The invention relates to the technical field of self-protection circuits of air conditioners, in particular to a five-in-one intelligent digital general-purpose air conditioner protector. Background technique: [0002] In the air-conditioning industry, compressors with more than three or five horses often work in high-voltage and high-current environments, so it is necessary to implement necessary protection functions for the compressor and even the whole machine. Aiming at the need for power supply phase sequence protection, compressor overcurrent protection and outdoor coil temperature detection during air conditioner operation, a three-in-one board designed with pure hardware circuits can realize phase sequence protection, overcurrent protection and outdoor temperature Detection) protection board is used in air conditioners. Although this board can realize these three functions, there are still some shortcomings. From the production point of view, ...

AI Technical Summary

Problems solved by technology

Aiming at the need for power supply phase sequence protection, compressor overcurrent protection and outdoor coil temperature detection during air conditioner operation, a three-in-one board designed with pure hardware circuits can realize phase sequence protection, overcurrent protection and outdoor temperature Detection) protection board is used in air conditioners. Although this board can realize these three functions, there are still some shortcomings. From the production point of view, due to the inconsistency in the production of over-current transformers, the production detection of over-current values , it is necessary to frequently adjust the voltage dividing resistor, and the production efficiency is greatly reduced; in terms of after-sales transportation, because the 2.7W transformer is used, its weight and volume are large, which often leads to the breakage of the PCB board, which increases the after-sales cost; from the development and design As far as the self-diagnosis function cannot be realized, once some components of the circuit fail, either the protection cannot be realized, or there will be a malfunction, so that the air conditioner cannot work normally; secondly, the communication between the three-in-one board and the indoor board is adopted. Two groups of relays are opened and closed, one is the defrosting signal, the relay is closed when the defrosting point is not reached, and it is disconnected when it reaches the defrosting point; the other relay is to judge the overcurrent phase sequence protection, when Once these two sets of signals are reversed, the air conditioner will not work properly

Images