Although SES Power takes customized lithium batteries as its main development direction, lithium batteries are inseparable from chargers, so customers often ask us to purchase power supplies and chargers. After all, purchasing all accessories from a professional supplier is the best way to There is quality assurance.

　　Let the senior engineers of SES Power briefly explain the knowledge of power supply for you:

　　A: What is a switching power supply

　　With the development and innovation of power electronic technology, switching power supply technology is also constantly innovating. At present, switching power supply is widely used in almost all electronic equipment due to 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 disadvantages, that is, the circuit is complex, difficult to maintain, and the pollution to the circuit is serious; the power supply noise is large, and it is not suitable for some low-noise circuits.

　　B: Characteristics 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.

　　C: 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.

　　D: The difference between switching power supply and ordinary 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 large output power. However, since the circuit works in the switching state, the noise is relatively large.

　　E: Features of Linear Power Supply

　　The power regulating tube of the linear power supply always works in the amplification area, and the current flowing through it is continuous. Due to the large power loss on the adjustment tube, a larger power adjustment tube is required and a large radiator is installed. power supply).

　　The working mode of the linear power supply requires a step-down device to change from high voltage to low voltage. Generally, it is a transformer, and there are others like KX power supply, and then output DC voltage through rectification. In this way, the volume is large, relatively bulky, low efficiency, and large heat generation; but it also has advantages: small ripple, good adjustment rate, small external interference, suitable for analog circuits/various amplifiers, etc.

　　Because there are many types of lithium batteries, for example, the charging voltage of ternary lithium batteries is generally 4.20V/Cell, the charging voltage of lithium iron phosphate batteries is generally 3.60V/cell, and lithium batteries are generally charged in CC-CV mode, so ordinary the switching power supply and linear power supply cannot be directly used in the lithium battery charging occasion!

　　The energy storage products launched by SES Power use square aluminum-shell lithium iron phosphate batteries that can perfectly replace lead-acid batteries. The maximum current reaches 2000A, the voltage covers 12V to 560V, and the capacity ranges from 1KWh to 1MWh. It covers lead-acid replacement, In the fields of industrial supporting, UPS, RV, solar energy storage, home energy storage, etc., their charging methods will be more complex and precise.