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空调除霜传感器的工作原理!

来源: 日期:2019-06-10 发布人:admin
  空调除霜传感器是一种负温度系数热敏电阻,称为NTC,其电阻随温度的升高而减小,随温度的降低而增大。额定电阻为25℃。空调除霜传感器与电阻器串联后,将5V(某些空调使用的+ 3.3v)电压除以CPU电压。由于空调除霜传感器采用负温度系数热敏电阻,其电阻值随温度的升高而减小,电阻随温度的降低而增大。因此,CPU输入电压定律为:当温度升高时,CPU输入电压升高,当温度降低时,CPU输入电压降低。电压变化进入CPU内部分析过程,确定当前管温或室温,并通过内部程序和手动设置来控制空调的运行状态。
  Air conditioning defrosting sensor is a negative temperature coefficient thermistor, called NTC. Its resistance decreases with the increase of temperature and increases with the decrease of temperature. The rated resistance is 25 C. After the defrosting sensor is connected in series with the resistor, the 5V (+ 3.3v) voltage for some air conditioners is divided by the CPU voltage. Because the air conditioning defrosting sensor adopts negative temperature coefficient thermistor, its resistance value decreases with the increase of temperature, and the resistance increases with the decrease of temperature. Therefore, the CPU input voltage law is: when the temperature increases, the CPU input voltage increases, and when the temperature decreases, the CPU input voltage decreases. Voltage changes enter the CPU internal analysis process, determine the current tube temperature or room temperature, and control the operation of air conditioning through internal procedures and manual settings.
  由于发送到CPU的采样电压随温度变化很大,制造商通常将其设计为25度,采样电压为电源电压的一半,从而给出温度变化。在潜伏期有很大的电压变化空间。如果采样电压设计过高或过低,都不能反映电流温度的变化。由于R1、R2和R3串联电阻的电阻是恒定的,如果我们不考虑接口的内部阻力CPU(事实上,接口的内部阻力相对较大,可能不被认为是),所以它是必要的,以确保它是一个,B, C三个CPU输入点电压2.5 V(25度),RT1也,RT2, RT3三个传感器只能使用三个串联电阻(R1, R2, R3)传感器值是相同的,或者是压降会更偏离。这就是空调除霜传感器的工作原理!
  Because the sampling voltage sent to the CPU varies greatly with temperature, manufacturers usually design it as 25 degrees, and the sampling voltage is half of the power supply voltage, thus giving the temperature change. There is a lot of room for voltage change during the latency period. If the sampling voltage is too high or too low, it can not reflect the change of current temperature. Because the resistance of the series resistors of R1, R2 and R3 is constant, if we do not consider the internal resistance of the interface CPU (in fact, the internal resistance of the interface is relatively large and may not be considered), it is necessary to ensure that it is a B, C three CPU input point voltage of 2.5 V (25 degrees), RT1, RT2, RT3 sensors can only use three series resistors (R1, R2, R3) sensor values are the same. Or the pressure drop will be more deviated. This is the working principle of air conditioning defrost sensor!
济南空调维修
  空调除霜传感器故障分析
  Fault Analysis of Air Conditioning Defrost Sensor
  (1)当电源是正常的,整个机器不工作,和机器是很短的时间内关闭,外部风扇不工作时发热是正常的,外部风扇不工作或停止异常,压缩机不启动,变频效应差,变频不工作,系统散热不解冻。除霜失败可更换室外盘管NTC或室外除霜板。
  (1) When the power supply is normal, the whole machine does not work, and the machine is shut down in a very short time, it is normal for the external fan to heat when it does not work, the external fan does not work or stop abnormally, the compressor does not start, the frequency conversion effect is poor, the frequency conversion does not work, and the system does not thaw. If defrosting fails, the NTC of outdoor coil or the defrosting board can be replaced.
  (2)当电源正常,空调不工作时,考场内环温度为NTC;在未停机或未达到设定温度的情况下停止空调,检查房间内环温度NTC;空调变频不能正常工作,相关。如果室内回路温度NTC发生故障,CPU会误判室内回路温度,造成故障。室内温度NTC损伤率不高。
  (2) When the power supply is normal and the air-conditioning is not working, the temperature of the inner ring of the examination room is NTC; when the air-conditioning is not stopped or the set temperature is not reached, the temperature of the inner ring of the room is NTC; the frequency conversion of the air-conditioning can not work normally, which is related. If the NTC of the indoor circuit temperature fails, the CPU will misjudge the temperature of the indoor circuit and cause the failure. Indoor temperature NTC damage rate is not high.

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