What distinguishes swapping power supplies from regular power supplies?
1. What is a switching power supply?
Switching power supply technology is continuously evolving along with power electronics technology's development and innovation. Due to its compact size, light weight, and great efficiency, switching power supplies are currently utilized in almost all electronic equipment. Given the current electronic information industry's rapid growth, it is an essential power supply technique.
Modern power electronic technology is used by switching power supplies to regulate the time ratio of switching on and off in order to keep a constant output voltage. The main components of a switching power source are a MOSFET and a PWM control IC.
The alternating power supply and the linear power supply are related. The switching tube is used to control the on-off of the current to create a high-frequency pulse current after its input terminal immediately rectifies the alternating current into direct current while operating under the influence of the high-frequency oscillating circuit. An inductor (high frequency transformer) is used to produce a steady low voltage direct current.
Since the magnetic core of a transformer has a size that is inversely proportional to the cube of the switching power supply's operating frequency, the smaller the core, the higher the frequency. By doing this, the size and weight of the power source can be decreased along with the transformer's size. Additionally, this power supply is far more effective than a linear power supply because it directly regulates DC. People prefer this because it saves energy. However, it also has drawbacks, including a challenging maintenance schedule, a complex circuit, and severe pollution. Because of their noise, power supplies may not be appropriate for use in all low-noise circuits.
Second, the characteristics of switching power supply
A switching power supply is generally composed of a pulse width modulation (PWM) control IC and a MOSFET. With the development and innovation of power electronics technology, switching power supplies are widely used in almost all electronic devices because of their small size, light weight and high efficiency, which shows its importance.
Three, the classification of switching power supply
According to the way switching devices are connected in the circuit, switching power supplies can be generally divided into three categories: series switching power supply, parallel switching power supply, and transformer switching power supply.
Among them, the transformer-type switching power supply can be further divided into: push-pull type, half-bridge type, full-bridge type, etc. According to the excitation of the transformer and the phase of the output voltage, it can be divided into: forward type, flyback type, single excitation type and double excitation type.
Fourth, the difference between switching power supply and ordinary power supply
The ordinary power supply is generally a linear power supply, and the linear power supply refers to the power supply in which the regulating tube works in a linear state. But it is different in the switching power supply. The switching tube (in the switching power supply, we generally call the adjusting tube as the switching tube) works in two states of on and off: on - the resistance is very small, off - the resistance is very high big.
Switching power supply is a relatively new type of power supply. It has the advantages of high efficiency, light weight, step-up and step-down, and large output power. However, since the circuit works in the switching state, the noise is relatively large.
