Switched-Mode Power Supply (SMPS) is a power supply device that converts electrical energy through high-frequency switching technology and is widely used in various electronic devices. Many people may have questions about whether SMPS can use DC input. This article will explore the relationship between SMPS and DC input, as well as its working principle and applicable scenarios from multiple perspectives.

What is SMPS and how does it work?

Switched-Mode Power Supply is a power conversion device that uses a high-frequency switching circuit to regulate the power supply. Its main function is to convert the input power supply (which can be AC ​​or DC) into a stable DC output to provide power for various devices. SMPS is different from traditional linear power supplies. It has higher efficiency, smaller size and lower heat generation, so it has been widely used in modern electronic devices. It is a type of 24vdc power supply.

Basic structure of SMPS

The basic structure of SMPS includes input rectifier, high-frequency switch, transformer and output rectifier. Its working principle is simply to rectify the input power into DC first, then convert the voltage through high-frequency switches and transformers, and finally output stable DC through output rectifiers and filters.

Input rectifier: If the input is AC, it will first be converted into DC through a rectifier. If the input is DC, this step is omitted.

High-frequency switch: The high-frequency switch is responsible for "cutting off" and "conducting" DC at a high frequency, thereby adjusting the voltage and current. This is the key to improving the efficiency of SMPS.

Transformer: The transformer steps up or down as needed. Since the operating frequency of the high-frequency switch is very high, the transformer can be designed to be very small, reducing the use of space and materials.

Output rectification and filter: The regulated current is rectified and filtered, and the output is a stable DC power supply for equipment use.

The difference between SMPS and linear power supply

Compared with traditional linear power supply, SMPS has significant advantages:

High efficiency: Due to the use of high-frequency switching technology, SMPS can reduce energy loss, making the power conversion efficiency as high as 80% or even more than 90%.

Small size: The high-frequency operation of SMPS allows its transformer and other components to be designed more compactly, and the volume is much smaller than that of linear power supply of the same power.

Strong flexibility: SMPS can achieve a wider range of voltage output by adjusting the switching frequency, which is very suitable for use in devices that require different voltage outputs.

Can SMPS use DC input?

Many people may think that SMPS can only use AC input, but this is not the case. SMPS can use both AC input and DC input. This depends on the specific design and application scenario. In some cases, it is completely feasible for SMPS to use DC input directly, and it can even improve the efficiency of the system.

How does DC input adapt to SMPS?

When switching mode power supply uses DC input, the system omits the input rectifier part because DC power does not need to be rectified. This means that DC power can directly enter the high-frequency switching part, reducing the conversion steps. This not only simplifies the circuit design, but also improves the overall energy conversion efficiency.

Common application scenarios of DC input

Solar power generation system: In a solar power generation system, the power generated by photovoltaic panels is DC power, and most electronic devices require stable DC power. Therefore, many solar applications use SMPS that supports DC input to convert the power of solar panels into DC power that can be used by the device.

Battery-powered system: In many mobile devices or backup power systems, the power provided by the battery is usually DC. In order to efficiently utilize the battery power, the DC input SMPS can directly regulate the battery voltage and provide a stable power output.

Electric vehicle charging system: The battery of an electric vehicle also stores energy in DC. In the charging pile system, the SMPS with DC input can directly adjust the current to a voltage and current suitable for battery charging, ensuring that the charging process is efficient and safe.

What is the key difference between the DC input and AC input of SMPS?

SMPS can use both AC input and DC input. The difference between the two is mainly reflected in the input processing link and conversion efficiency.

Processing process of AC input

For SMPS with AC input, the AC power must first be converted into DC power through a rectifier circuit, and then regulated by a high-frequency switch. Therefore, the switching power supply with AC input usually includes a rectifier bridge and a filter capacitor to ensure that the output DC power is stable and not affected by the fluctuation of the mains power.

Processing of DC input

For SMPS with DC input, since the input current is already DC, the rectification link is omitted and the electric energy can directly enter the high-frequency switching part. In this case, the conversion efficiency will be higher because one step of power conversion is reduced and the circuit is relatively simple.

Efficiency comparison

Under normal circumstances, the efficiency of SMPS with DC input will be slightly higher than that of SMPS with AC input. Because SMPS with DC input omits the rectification and filtering process, it directly converts the electric energy into the voltage and current required by the device, and each power conversion process will bring a certain amount of energy loss. Therefore, in applications that require efficient power conversion, SMPS with DC input is an ideal choice.

Recommendations for purchasing NVVV brand DC input SMPS

When considering purchasing an SMPS that supports DC input, it is very important to choose a reliable brand. As a professional power supply equipment manufacturer, NVVV provides efficient and stable SMPS products suitable for a variety of applications.

Why choose NVVV?

NVVV's SMPS products have the following outstanding features:

Efficient energy conversion: Whether it is AC input or DC input, NVVV's SMPS can achieve efficient energy conversion, ensuring that the system can operate stably under various conditions.

Multiple protection functions: NVVV's products have built-in multiple protection functions, including overcurrent protection, overvoltage protection and short circuit protection, to ensure that the system is safe and reliable, especially suitable for solar power generation systems and battery-powered systems.

Strong flexibility: NVVV provides a variety of SMPS models, suitable for devices with different power requirements, and can be compatible with DC and AC input to meet the needs of different occasions.

NVVV's application scenarios

NVVV's switch mode power supply is widely used in a variety of devices, especially in the following scenarios:

School network laptop charging cabinet: In the education industry, laptop charging cabinets usually need to power multiple devices at the same time. NVVV's SMPS can provide stable power to ensure efficient charging of devices.

Embroidery machine: In the textile industry, the efficient operation of embroidery machines depends on a stable power supply. NVVV's SMPS can provide stable current for these industrial equipment, ensuring that the machine can run for a long time without being affected by power fluctuations.

3D printers: 3D printers have high requirements for power supply. NVVV's SMPS can provide accurate voltage output for them, ensuring that there will be no printing failures caused by unstable voltage during the printing process.

Watering machine: In agriculture and gardening, the automated irrigation system requires stable power support. NVVV's SMPS can provide reliable power guarantee under complex outdoor power grid conditions.

Conclusion

In general, SMPS can use not only AC input, but also DC input. For some specific applications, such as solar power generation systems, mobile power supplies and electric vehicles, DC input SMPS can improve system efficiency and simplify circuit design. NVVV's DC input SMPS products have become an ideal choice in many industries due to their high efficiency and stability.

When choosing an SMPS, it is important to choose the right model according to the specific needs of the system to ensure that it can provide stable power output and has the necessary protection functions. Whether in home electronic devices, industrial equipment or new energy fields, NVVV's SMPS can provide users with efficient and reliable power solutions.