What is the difference between switching LED power supply and ordinary power supply?
What is a switching LED power supply?
The switching power supply is also called the driving power supply. With the development and innovation of power electronic technology, the switching power supply technology is also constantly innovating. At present, the switching power supply is widely used in almost all electronic equipment because of its small size, light weight and high efficiency. It is an indispensable power supply method for the rapid development of today's electronic information industry.
Switching power supply is a power supply that uses modern power electronics technology to control the time ratio of switching on and off to maintain a stable output voltage. Switching power supplies are generally composed of pulse width modulation (PWM) control ICs and MOSFETs.
The switching power supply is relative to the linear power supply. Its input terminal directly rectifies the alternating current into direct current, and then under the action of the high-frequency oscillation circuit, the switching tube is used to control the on-off of the current to form a high-frequency pulse current. With the help of an inductor (high frequency transformer), a stable low-voltage direct current is output.
Since the size of the magnetic core of the transformer is inversely proportional to the square of the operating frequency of the switching power supply, the higher the frequency, the smaller the core. In this way, the transformer can be greatly reduced, and the power supply can be reduced in weight and volume. And because it directly controls DC, this power supply is much more efficient than a linear power supply. This saves energy, so it is favored by people. But it also has shortcomings, that is, the circuit is complicated, maintenance is difficult, and the pollution to the circuit is serious. The power supply is noisy and not suitable for some low-noise circuits.
Features of switching power supply
The switching power supply is generally composed of a pulse width modulation (PWM) control IC and a MOSFET. With the development and innovation of power electronic technology, switching power supply is widely used in almost all electronic equipment mainly because of its small size, light weight and high efficiency. Its importance is evident.
Classification of switching power supplies
According to the way the switching devices are connected in the circuit, the switching power supply can be generally divided into three categories: series switching power supply, parallel switching power supply, and transformer switching power supply.
Among them, the transformer switching power supply can be further divided into: push-pull, half-bridge, full-bridge and so on. According to the excitation of the transformer and the phase of the output voltage, it can be divided into: forward excitation, flyback type, single excitation type and double excitation type.
The difference between switching power supply and ordinary LED power supply
Ordinary power supply is generally linear power supply, linear power supply refers to the power supply in which the adjustment tube works in a linear state. It is different in switching power supply. The switching tube (in switching power supply, we generally call the adjusting tube a switching tube) works in two states: 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, step-down, and high output power. However, since the circuit works in the switching state, the noise is relatively large.
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