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The difference between Open Frame Power Supply and Transformer

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.04.08
What is Open Frame Power Supply?



Open Frame Power Supply is a power supply that utilizes modern power electronics technology to control the open circuit ratio of bare board tubes to maintain stable output voltage. Open Frame Power Supply typically consists of a Pulse Width Modulation (PWM) control IC and a MOSFET.

Open Frame Power Supply is a power supply that utilizes modern power electronics technology to control the time ratio of bare board switching transistors to maintain stable output voltage. Open Frame Power Supply can be divided into two types: AC/DC and DC/DC. According to whether there is electrical isolation between input and output, it can be divided into two categories: isolated DC/DC converters and non isolated DC/DC converters. Open Frame Power Supply has protection functions such as overcurrent, overheating, and short circuit. Wide input voltage range, high isolation voltage for input and output, and high isolation voltage for isolated input and output.

Let's explain the difference between Open Frame Power Supply and transformers for you.

What is a transformer?



A transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. The main components are the primary coil, secondary coil, and transformer. The main functions include voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic core), etc. According to their uses, they can be divided into power transformers and specialized transformers (magnetic saturation transformers). Circuit symbols are usually used as the beginning of the number T. For example: T01, T 201, etc.

The difference between Open Frame Power Supply and transformer functions

1. Open Frame Power Supply is a DC power supply, and the transformer is an AC power supply

2. Open Frame Power Supply has a high frequency (usually in the tens of kilohertz range), a high transformer frequency, and a low frequency. Open Frame Power Supply uses a pulse transformer as a high-frequency transformer, with iron cores such as ferrite, which are small in size and high in efficiency (the higher the frequency, the higher the efficiency). It is said that people first think of a power frequency transformer, which operates at a frequency of 50 Hz and belongs to low-frequency transformers. The iron core must be made of silicon steel sheet soft magnetic material (to prevent eddy currents from generating Joule heat);

3. The functional categories of the two power supplies are different. Open Frame Power Supply has a pulse transformer and an up and down rectification section. Regardless of which frequency band of the transformer only has voltage conversion, there is no rectification function;

4. Open Frame Power Supply: Compared with traditional power supplies, it has the characteristics of low power consumption, high efficiency, small size, light weight, and wide voltage range. Widely used in fields such as computers and peripheral devices, communication, automatic control, and household appliances. However, the prominent drawback of Open Frame Power Supply is its strong electromagnetic interference. Interference signals not only have a wide frequency range, but also have a certain amplitude. Through conduction and radiation, it can pollute the electromagnetic environment, interfere with communication equipment and electronic products. If handled improperly, Open Frame Power Supply itself can become a source of interference.

Traditional transformer power supply has the disadvantages of large size and low efficiency, but currently, manufacturers in the market use low-quality selenium steel plates or fake selenium sheets for profit, causing transformers to overheat and have low efficiency.
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