Design of Photoelectric Inversion Switch and Its Reliability Detection System

The power-on mode of the storage test system is a very important link. Many tests are carried out after a certain period of heat preservation, and the test device is placed in the object to be tested before heat preservation. This requires that the power consumption of the test device be minimized during the heat preservation process. The function of the inversion switch is that the test system does not work during the heat preservation process of the object, and the test system is powered on by the inversion switch before the test, so as to achieve low power consumption and enable the test system to operate normally during work.

The inversion switch is a key component of the storage test system. Its reliability determines the reliability of the storage test system and is directly related to the success or failure of the entire experiment.
This paper studies a photoelectric inversion switch and designs a complete reliability detection system to effectively analyze the reliability of the photoelectric inversion switch.

1 Photoelectric inversion switch

1.1 Composition of photoelectric inversion switch

The photoelectric inversion switch is composed of a transmitting tube and a receiving tube installed and fixed on the same light-base shell. A small steel ball is installed in the inner cavity of the shell, and the circuit module responds to the outside. These three parts are encapsulated in the same small mechanical cylinder. The structure of the photoelectric inversion switch is shown in Figure 1. Figure 1 Photoelectric inversion switch structure diagram

Infrared light-emitting diodes have the advantages of low energy consumption, fast response speed, anti-interference ability, reliability and durability. Infrared light-emitting diodes are used as transmitters to convert electrical signals into infrared light signals, and phototransistors are used as receivers to receive infrared light signals and then convert infrared light signals into electrical signals. In the design process of this micro-opening, phototransistors matching infrared light-emitting diodes are selected.

1.2 Working process of photoelectric inversion switch

When the photoelectric inversion switch is powered on, the emitting diode begins to emit infrared rays. When the small steel ball does not block the light of the emitting tube, the receiving transistor receives the light and outputs a valid signal. This signal raises the level through the circuit conversion part, thereby turning on the switch; as the inversion process begins, the small steel ball falls, blocks the light of the emitting diode, and the receiving transistor cannot receive the light, so the switch is disconnected.

1.3 Waveform theory of photoelectric inversion switch

The mechanical shell is the most important part for the photoelectric inversion switch. The inner cavity of the shell has two tapered cavities. According to the structure of the mechanical shell, the conversion of the working state of the photoelectric inversion switch after one inversion (rotation 360°) is shown in Figure 2. Figure 2 Angle diagram of the switch state when the center line rotates one circle Based on the above, the waveform diagram of the photoelectric inversion switch working in one cycle can be obtained. The waveform diagram is shown in Figure 3. From the theoretical waveform diagram of the photoelectric inversion switch working, it can be seen that the ideal duty cycle of a switch working in one cycle (rotating inverted 360°) is 251.5/360. This is the characteristic of the test signal of the photoelectric inversion switch detection system, and it also provides a basis for verifying the accuracy of the detection system. Figure 3 Waveform diagram of the photoelectric inversion switch working in one cycle 2 Design of the photoelectric inversion switch detection system 2.1 Overall structure of the detection system The detection system of the photoelectric inversion switch is composed of a small power speed regulating motor, a rotating drum for fixing the photoelectric inversion switch and the circuit module, and a circuit module. Figure 4 is the overall structural block diagram of the detection system, which shows the relationship between the various parts. Figure 4 Overall structure diagram of the detection system When the system is assembled, it is connected to the power supply and enters the low power consumption state; during the rotation of the low power motor, when the phototransistor of the detection system senses the light emitted by the light emitting diode, the detection system is triggered, the system starts cyclic sampling and stores the conversion results in the external Flash; when the data in the Flash reaches the designed storage capacity, the system stops sampling and enters the waiting state for reading.