Traditional Chinese Infrared remote control auto-regulator (Workshop Practice) — Circuit, Wiring & Debug Guide

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Infrared remote control automatic voltage regulatorCurrently, there are many types of voltage regulators used for AC power supply, but few can realize automatic voltage regulation. Even automatic voltage regulators often require users to go to the voltage regulator and press the corresponding function switch.The infrared remote control automatic voltage regulator can directly control the on and off of 220V AC power and automatically adjust the voltage. That is to say, if the 220V power supply is originally disconnected, as long as the infrared transmitter sends an infrared signal command, the power supply will be turned on; if the 220V power supply is originally connected, as long as an infrared signal command is sent, the power supply will be disconnected. When the infrared command sent is slightly longer, the connected power supply voltage can automatically adjust from 220V to about 25V. If the infrared transmitter command still exists, the power supply voltage can rise from 25V to about 210V. The change period is 8 seconds, and the cycle continues until the infrared transmitter command ends. Therefore, people can adjust the voltage to a certain value based on the power required by the controlled load. If you control the brightness of an incandescent lamp or the speed of an electric fan, you can stop issuing instructions at any time according to the brightness of the bulb or the speed of the fan. Then the brightness of the light bulb or the speed of the fan is the required brightness or speed, and you can achieve whatever you want.This selected power supply voltage has a memory function, that is, when the power supply is disconnected and then connected again, the starting working voltage of the power supply is this selected voltage. To increase or decrease the voltage, just increase the time for sending signal instructions. This is because a logic operation function integrated circuit with storage function is used in the circuit.1． How the circuit worksThe infrared emission circuit of the automatic voltage regulator is shown in Figure 37-1.Figure 37-1Figure 37-1 is a duty cycle adjustable square wave generator transmitting circuit composed of time base integrated circuit IC1. It is actually a multivibrator composed of time base circuit NE555 and peripheral resistor-capacitance components. The oscillation frequency is determined by the ratio of resistors R1 and R2. When the reset key K is pressed, the power supply of the multivibrator is turned on, and the ③ pin of IC1 outputs a signal voltage, which is added to the base of the transistor BG, and drives the infrared light-emitting diode to radiate signal pulses through the BG tube (9013) for the receiver to receive.The infrared receiving circuit of the automatic voltage regulator is shown in Figure 37-2.Figure 37-2In normal times, photosensitive transistor BG1 is cut off due to no infrared receiving signal input, and BG2 to BG5 are not conducting. Then the collector of BG5 is at high level, the output pin 8 of IC2 is at low level, the triac SCR is not conducting, and the load power supply is in a disconnected state. When BG1 receives the signal command from the transmitter, BG2~BG5 are immediately turned on, the collector of BG5 is low level, and the input terminals of IC2 are pins ⑤ and ⑤, and pin ⑧ is the output terminal. When the input terminal of IC2 is at low potential, a trigger pulse appears in every half cycle of the power frequency of 50Hz. The phase angle of the pulse changes slowly and periodically for about 8 seconds between 41 and 159. This periodically changing pulse triggers the control electrode of the triac SCR through diode D3 to complete the periodic voltage regulation task.2. Component selectionIC1 is the time base integrated circuit NE555.IC2 is a PMOS trigger integrated circuit S576 with logic operation function. It has an eight-pin vertical package structure. The pin arrangement is as shown in Figure 37-3.Figure 37-3BG1, BG4 and BG5 are 3DG6 or 9013β>80.BG2 is a field effect transistor 3DJ6.BG3 is a PNP transistor, optional 3CG14 or 9015.BG1 is a photosensitive transistor, choose 3DU5, etc.SCR is a two-way thyristor, optional 3A/700V or 4A/600V, with a 2×20×40mm aluminum heat sink installed on the casing.D10 and D2 are diodes, 1N4001, and D3 is 1N4148.DW is a Zener diode, 2CW21.RD is the fuse, 2A.LED1~LED3 are infrared light-emitting diodes.R151kΩR2, R6100kΩR3, R141kΩR4510kΩR75．1kΩR8510ΩR96.8kΩR10, R1110kΩR124.7MΩR131.5MΩC1, C4, C80.01μFC2, C70．1μFC36800pFC51μFC610μFC9, C114700pFC100．047μ …

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