What is the difference between a switching power supply (SMPS) and a transformer?
A transformer is a device that uses the principle of electromagnetic induction to transform voltage, current, and impedance. Transformers are mainly used in alternating current circuit circuits.
Switching power supply is a type of power supply that utilizes modern power electronics technology to control the time ratio of switching transistors on and off, maintaining a stable output voltage. Switching power supply can be divided into two categories: AC/DC and DC/DC; According to whether there is electrical isolation between input and output, it can be divided into two categories: one is isolated DC/DC converters; The other type is called non isolated DC/DC converters, which do not have isolation. Switching power supplies have protection functions such as overcurrent, overheating, and short circuit. They have a wide voltage input range, isolated voltage between input and output, and high isolation voltage between isolated input and output.
LED display screens typically consist of display modules, control systems, and power systems. The display module is composed of a matrix of LED lights and is responsible for emitting light for display; The control system can display text, images, videos, and other content on the screen by controlling the brightness of the corresponding area. The LED display screen adopts a low-voltage scanning drive, and the power system is responsible for converting the input voltage and current into the voltage and current required by the display screen. The power system uses a switching power supply, which has the characteristics of low cost, small size, light weight, simple peripheral circuit design, high efficiency, low noise, stability and reliability.
1. High frequency transformers are mainly used as high-frequency switching power supply transformers in high-frequency switching power supplies, and are also used as high-frequency inverter power supply transformers in high-frequency inverter power supplies and high-frequency inverter welding machines. According to the working frequency, it can be divided into several levels: 10kHz-50kHz, 50kHz-100kHz, 100kHz-500kHz, 500kHz-1MHz, and above 10MHz.
2. In the design of high-frequency transformers, the leakage inductance and distributed capacitance of the transformer must be minimized because high-frequency transformers in switching power supplies transmit high-frequency pulse square wave signals. During the transient transmission process, leakage inductance and distributed capacitance can cause surge currents and peak voltages, as well as top oscillations, resulting in increased losses.
