Production of integrated electronic energy-saving emergency lights

This integrated electronic energy-saving emergency light uses finished electronic energy-saving lamps as lamp holders, which has the following advantages: 1. Local materials are used and supermarkets have a large supply; 2. The power saving effect is obvious, saving 70% to 80% of electricity compared with incandescent lamp holders; 3. The DC/DC conversion circuit is reduced in size. The lamp is powered by a 12V battery and is suitable for emergency lighting in power outage areas. It can also provide portable emergency lights for individual stalls and rural professional households to replace "gasoline and kerosene" lamps, which is very beneficial to environmental protection.

Working principle: The electrical principle of the lamp is shown in the figure. It is a typical push-pull DE/DE converter, which consists of IC1 pulse width modulation switch controller and peripheral dual operational amplifiers A1 and A2. Its oscillation frequency is determined by the timing resistor and timing capacitor on the (6) and (7) pins of IC1, which is about 35kHz. The general working process is as follows: Two sets of square wave pulses with opposite phases are output from the (11) and (14) pins of IC1, which are amplified by power field effect transistors Q1 and Q2 and boosted by pulse transformers to output a high-frequency voltage of about 230V. However, the bridge rectifier composed of D1~D4 converts it into a DC high voltage, which is responsible for continuously delivering load current to the output capacitor C5 through the L1 energy storage inductor. The voltage stabilization feedback process is:

The feedback signal is divided by R8 and R9 and sent to the voltage follower A2, and then sent to the pin (1) of IC1 for comparison with the reference on the pin (2), completing the feedback control, so as to achieve a 300V output voltage. The voltage comparator A1 is a battery undervoltage indicator. When the input battery drops below 10.8V, the voltage comparator flips. The output is high and LED1 is lit, indicating that the external battery must be charged.

Component requirements and assembly: IC1 is a switching power supply controller SG3524, and dual op amps A1 and A2 are LM358. Both are dual in-line plugs. Resistors and capacitors are all conventional series. Among them, the oscillation capacitor C4 should be a CBB film capacitor. Pulse transformer T1 uses an E128 ferrite core. The primary uses φ0.6mm enameled wire and is wound in parallel with 14T. Center tap; the secondary uses φ0.27mm enameled wire and is wound with 270T. Insulation film should be added between layers. L1 inductor is a high-frequency magnetic ring with a diameter of 18mm. Use φ0.31mm enameled wire to wind 50T in series. When assembling, pay attention to equipping the two field effect tubes with small heat sinks. There are finished products on the market. Debugging is very simple: it should work normally when connected to a 12V battery. When the battery drops to 10.8V, calibrate the potentiometer W1 to make LED1 just light up.

Instructions for use: The output end of this lamp can be connected to a screw-type lamp holder purchased at the lamp market. It is specially matched with E27 lamp holder. The power can be any electronic energy-saving lamp between 7 and 20W. The capacity of the battery used depends on the needs. Generally, a maintenance-free type of 12V/14Ah is selected. There is also a ready-made charger. The principle of electricity use is: "Use it when it is fully charged. Do not use it when it is under voltage!"