Beijing Hansheng Puyuan Technology Co., Ltd. is a high-tech enterprise specializing in the development, production, and sales of programmable adjustable power supplies, electronic loads, differential position meters, power instruments, and other series of products. The products are widely used in industrial production, instrumentation, automatic control, environmental protection, energy conservation, and other fields.
　　
A regulated power supply is an electronic device that can provide stable AC or DC power to a load, including two categories: AC regulated power supply and DC regulated power supply.
　　
Using a three terminal adjustable voltage regulator integrated circuit LM317, the voltage can be adjusted within the range of 1.5-25V, with a larger load current of 1. The circuit is shown in the diagram.


　　

A power supply is a device that provides power to electronic devices, also known as a power supply. It provides the electrical energy needed by all components in a computer.
　　
Circuit (1)
　　
　　Simple circuit diagram of adjustable voltage regulator power supply---Circuit working principle: 220V AC power passes through a transformer
　　
Transformer is a device that uses the principle of mutual inductance to change the AC voltage. Its main components are the primary coil, secondary coil, and iron core (magnetic core). In electrical equipment and wireless circuits, it is commonly used for voltage regulation, impedance matching, safety isolation, etc. A transformer is a device that converts voltage, current, and impedance. When an alternating current is passed through the primary coil, an alternating magnetic flux is generated in the iron core (or magnetic core), inducing voltage (or current) in the secondary coil. It consists of an iron core (or magnetic core) and a coil, which has two or more windings. The winding connected to the power supply is called the primary coil, and the other windings are called the secondary coils.
　　
After T voltage reduction, 24V AC power is obtained; After full bridge rectification consisting of VD1 to VD4 and C1 filtering, a DC voltage of around 33V is obtained. The voltage is stabilized and outputted through the integrated circuit LM317. Adjust potentiometer
　　
RP， The output voltage can be continuously adjusted. In the figure, C2 is used to eliminate parasitic oscillations, C3 is used to suppress ripples, and C4 is used to improve the transient response of the regulated power supply. VD5 and VD6 provide protection in the event of capacitor leakage at the output end or short circuit at the adjustment end. LED is the working indicator light of the regulated power supply, and resistor R1 is the current limiting resistor. Installing a micro voltmeter PV at the output end can visually indicate the output voltage value. Selection and production of electronic components; There are no special requirements for the components, so they can be selected according to the diagram.
　　
Key points of production: ① C2 should be as close as possible to the output terminal of LM317 to avoid self excitation and unstable output voltage; ② R2 should be close to the output and adjustment terminals of LM317 to avoid voltage drop between the output terminal and R2, which may cause changes in the reference voltage, under high current output conditions; ③ The adjustment end of the voltage regulator block LM317 should not be suspended, and special attention should be paid when connecting the adjustment potentiometer RP to avoid poor contact of the sliding arm causing the adjustment end of LM317 to be suspended; ④ Do not arbitrarily increase the capacity of C4; ⑤ The integrated block LM317 should be equipped with heat sinks to ensure its long-term stable operation.
　　
The company has won the market with excellent service, reliable quality, strong development efforts, and strong capabilities. The company regards customers as gods, develops and produces more precise and reliable products according to their needs, and provides various technical solutions according to their needs. All products of the company are independently developed, in line with national industry standards, with exquisite appearance, complete functions, simple operation, and system solutions that will make your products more advanced. We always adhere to the business philosophy of "creating high-quality products with technology and forging the future with integrity", adhere to the management principle of "survival through quality and development through variety", and wholeheartedly provide external users with * products, perfect services, and strong capabilities. We sincerely hope to have extensive cooperation and exchanges with operators, experts, and scholars in various industries to achieve win-win results.