In modern electronic equipment and industrial control systems, the stability and adjustability of power supply are crucial. As a high-performance power supply device, the adjustable switching power supply not only has the advantages of high efficiency and small size of traditional switching power supplies, but also can dynamically adjust the output voltage or current according to demand. It is widely used in laboratory testing, communication equipment, automation control and other fields.
So, what is the difference between an adjustable switching power supply and an ordinary switching power supply? Ordinary switching power supplies usually output a fixed voltage, while adjustable switching power supplies allow users to freely adjust the voltage or current within a certain range, providing higher flexibility and adaptability. This article will introduce in detail the working principle of the adjustable switching power supply and its key differences from ordinary switching power supplies.
1. What is an adjustable switching power supply
An adjustable switching power supply refers to an input AC power supply that is converted into DC power after rectification and filtering, and then converted into high-frequency AC power to be provided to the transformer for transformation, thereby generating the required one or more sets of voltages.
2. Working principle of adjustable switching power supply
The working principle of adjustable switching power supply is to convert AC power input into DC through rectification and filtering, control the switch through high-frequency PWM signal, add DC to the primary of switching transformer, and induce high-frequency voltage on the secondary of switching transformer, which is provided to the load after rectification and filtering. At the same time, the output voltage is fed back to the adjustable control circuit, and then the PWM duty cycle is changed, so as to realize the voltage output voltage change.
3. Workflow
Process
Power supply → input filter → full-bridge rectification → DC filter → switch tube (oscillation inverter) → switching transformer → output rectification and filtering.
Details
3.1 Adapt to the needs of production development
The original power supply can be used, and the number of modules can be flexibly increased or decreased on this basis, the current can be increased or decreased, and the utilization rate of equipment can be improved.
3.2 Improve the reliability of production operation
The power supply is designed in N+1 mode. Under normal circumstances, all modules are involved in the work. If the equipment fails, the power supply will not stop. The system will automatically reduce the current operation and exit the faulty unit without affecting production.
3.3 Easy maintenance
All module units are universal, and only a few module units need to be backed up to freely replace the faulty module, making maintenance relatively simple.
3.4 Digital control
Each module unit uses a microprocessor as the control core, and mainly uses software programs to implement automatic current sharing and other control schemes. The control is flexible, accurate, and dynamic. Response is fast, the number of components used is small, and the reliability is high.
3.5 The entire power supply system adopts an intelligent main line structure to achieve module hot swap, current sharing control, fault detection, and fault information display functions, and the user interface is intuitive and friendly.
4. The difference between adjustable switching power supply and voltage-stabilized switching power supply devices
The biggest difference between adjustable switching power supply and voltage-stabilized switching power supply is that the adjustable switching power supply has an independent auxiliary power supply inside, which supplies power to the chip separately, so that the chip can work independently without being disturbed by the output voltage, thereby achieving adjustable output.
5. The difference between the application of adjustable switching power supply and voltage-stabilized switching power supply
The biggest feature of the voltage-stabilized switching power supply is that the output is constant, which is often used in some devices that require a fixed voltage, such as 12V input LED lights. The advantages of using a voltage-stabilized switching power supply to power this type of equipment are low price, stable output, and easy installation. However, if there is a scenario where multiple LED lights need to be installed, each LED light needs to be equipped with a voltage-stabilized switching power supply, which will be crowded and inconvenient to operate.
The characteristic of the adjustable switching power supply is that the output voltage and current can be adjusted. Compared with the voltage-stabilized switching power supply, the disadvantage is that the price is slightly higher. However, since the output voltage and current of the adjustable switching power supply are adjustable, it is more convenient to operate. For example, if a company buys an adjustable switching power supply of 24V, it can be adjusted to 12V for LED lights with 12V input, and adjusted to 24V for battery charging, etc. One power supply can be used for multiple devices. In addition, centralized power supply of the above equipment can also be easily realized.
6. Use cases of adjustable switching power supply in other fields
6.1 Electrolysis: For example, water electrolysis requires constant output current. The adjustable switching power supply can set the required output current, keep the output current constant, and adjust the voltage with environmental changes;
6.2 LED dimming: The brightness change of LED lamp can be conveniently achieved by adjusting the output voltage of the adjustable switching power supply;
6.3 Industrial control: Motor speed regulation, punch control, etc. can all be achieved directly by adjusting the adjustable switching power supply.
The adjustable switching power supply provides more accurate power support for laboratory research and development, industrial automation, communication equipment and other scenarios with its flexible voltage/current regulation capability. Compared with traditional switching power supplies, it not only has the advantages of high efficiency and small size, but also can dynamically adjust the output according to actual needs to meet diverse application needs.
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