An air conditioner indoor unit and its AC overvoltage detection device

Abstract

The invention belongs to the field of air conditioners, and particularly relates to an air conditioner, an indoor unit and an alternating-current overvoltage detection device thereof. The alternating-current overvoltage detection device comprises an input voltage conversion module connected with an alternating-current power source which is input, an optocoupler and an MCU (microprogrammed control unit) detection processing module. Voltage signals transmitted by the optocoupler are acquired through an I / O pin of an MCU chip; whether currently-input voltage of the alternating-current power source is overhigh or not according to a cycle T of rectangular waves formed by the voltage signals; when the cycle T is smaller than a preset voltage cycle threshold value t, the currently-input voltage of the alternating-current power source is determined to be overhigh, and power is controlled not to be supplied to an outdoor unit of the air conditioner any more. A whole circuit is simple in composition structure and low in cost, and detection can be realized through a common I / O pin of the MCU chip without depending on A / D detection ports, so that requirements on resources of the A / D detection ports of the MCU chip are lowered to a large extent, and large-scale popularization and application are facilitated.

Description

technical field [0001] The invention belongs to the field of air conditioner control, in particular to an air conditioner indoor unit and an AC overvoltage detection device thereof. Background technique [0002] In the existing air conditioners, the indoor unit generally does not have a voltage detection function, and the power supply of the outdoor unit is generally controlled by the indoor unit; when the external input AC power voltage is too high, it is easy to cause the compressor drive module and fan of the outdoor unit to Damage to components such as the drive module, and even the compressor itself and the fan itself will cause damage. In order to avoid these phenomena, it is necessary to add an overvoltage detection device to the indoor unit: when the external input AC power voltage is too high, it will no longer supply power to the outdoor unit, and the display panel will prompt an overvoltage fault to control the air conditioner to stop running. [0003] The curren...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is first to provide an AC overvoltage detection device for indoor units of air conditioners, which aims to solve the problem that the existing AC overvoltage detection devices for indoor units of air conditioners have complex structures, high costs, and shortage of internal resources of the indoor units. technical issues

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