As the name suggests, the switching power supply is the use of electronic switching devices (such as transistors, FETs, thyristors, etc.), through the control circuit, the electronic switching devices constantly "on" and "off", so that the electronic switch The device pulse-modulates the input voltage for DC / AC, DC / DC voltage conversion, adjustable output voltage, and automatic voltage regulation.

Switching power supply generally by the pulse width modulation (PWM) control IC and MOSFET composition. Compared with the linear power supply, both the switching power supply and the power supply increase with the output power, but the growth rate of the two are different. Linear power cost at a certain point of output power, but higher than the switching power supply, which is called the cost reversal point. With the development and innovation of power electronics technology, the switching power supply technology is constantly innovating. The cost reversal point is increasingly moving to the low output power terminal, which provides a vast space for development of switching power supply.

The switching power supply is a kind of power supply that uses modern power electronics technology to control the turn-on and turn-off time ratio of the switch tube and maintain a stable output voltage. The switching power supply generally consists of a pulse width modulation (PWM) control IC and a MOSFET. With the development of power electronics and innovation, making the switching power supply technology is constantly innovating. Currently, the switching power supply is widely used in small, lightweight and high efficiency almost all of the electronic equipment, is the rapid development of today's electronic information industry, a power supply.

With the rapid development of power electronics technology, the relationship between power electronics equipment and people's work and life is increasingly close. However, the electronic equipment is inseparable from the reliable power supply. In the 90's, the switching power supply has entered the field of various electronic and electrical appliances one after another. Switch, communications, electronic test equipment power supply, control equipment, power supplies have been widely used in switching power supply, but also to promote the rapid development of switching power supply technology.

Compared with the linear power supply, both the switching power supply and the power supply increase with the output power, but the growth rate of the two are different. Linear power costs at a certain point of output power, but higher than the switching power supply. With the development and innovation of power electronics technology, the switching power supply technology is continuously innovating, and the cost reversal point is increasingly moving toward the low output power terminal, which provides a wide range of development space for switching power supply.

High frequency switching power supply is the direction of its development, high-frequency switching power supply miniaturization, and switching power supply into a wider range of applications, especially in high-tech fields, promoting high-tech products of small size, light The In addition the development and application of switching power supply in security monitoring, energy conservation, resource conservation and environmental protection are of great significance.

Switching power supply products are widely used in industrial automation and control, military equipment, scientific research equipment, LED lighting, industrial equipment, communications equipment, power equipment, instrumentation, medical equipment, semiconductor refrigeration heating, air purifier, electronic refrigerator, LCD, LED Lighting, communications equipment, audio-visual products, security monitoring, LED lights, computer chassis, digital products and equipment and other fields.

1, small size, light weight: Because there is no power frequency transformer, so the volume and weight of only linear power 20 ~ 30%.

2, low power consumption, high efficiency: power transistor work in the switch state, so the power consumption of the transistor small, high conversion efficiency, generally 60 to 70%, while the linear power supply only 30 to 40%.

Folding working conditions

1, switch: power electronics work in the switch state rather than linear state

2, high frequency: power electronics work in the high frequency rather than the low frequency of the working frequency

3, DC: Switching power supply output is not DC but AC