The concept of switching power supply is the use of modern power electronics technology to control the opening and closing time ratio of the switch, to maintain a constant output voltage, a switching power supply generally consists of pulse width modulation (PWM) control IC and MOSFET composition. Switching power supply and linear power supply are comparable, the cost of both increases with the increase of output power, but the growth rates of the two are different. The linear power supply cost is higher than the switching power supply at a certain output power point, which is called the cost reversal point. With the development and innovation of power electronics technology, the switching power supply technology is constantly changing. This cost-reversal point is increasingly moving to low-power output terminals, which provides a broad space for the development of switching power supplies.
The high frequency of the switching power supply is the direction of its development. The high frequency of switching power supply miniaturization and switching power supply into a wider range of applications, especially in high-tech applications, has promoted the miniaturization and lightweight of high-tech products. Change. In addition, the development and application of switching power supply are of great significance in energy conservation, resource conservation and environmental protection. Power electronics used in switching power supplies are mainly diodes, IGBTs, and MOSFETs. SCR has a small number of applications in the switching power supply input rectification circuit and soft start circuit. GTR drive is difficult, the switching frequency is low, and gradually replaced by IGBT and MOSFET.
Three Prerequisites 1. Switching: Power electronic devices work in the switching state instead of the linear state 2. High-frequency: Power electronics operate at high frequencies rather than low frequencies close to the power frequency. 3. DC: The switching power supply outputs DC instead of AC. Switching power supply classification:
In the field of switching power supply technology, people are developing related power electronic devices while developing switching frequency conversion technology. Both promote each other to push the switching power supply towards light, small, thin, low noise, high reliability, and the annual growth rate of more than two digits. The development of anti-jamming direction. Switching power supply can be divided into two major categories: AC/DC and DC/DC. The DC/DC converter is now modularized, and the design technology and production process are both mature and standardized at home and abroad, and have been recognized by users. However, due to its own characteristics, the modularity of AC/DC has encountered complex technical and process manufacturing issues in the process of modularization. The following describes the structure and characteristics of the two types of switching power supplies.
Grounding switching power supply will generate more interference than linear power supply. Grounding and shielding measures shall be taken for power equipment sensitive to common mode interference. According to EMC limits such as ICE1000, EN61000 and FCC, all switching power supplies adopt EMC electromagnetic compatibility measures. Switching power supplies generally have EMC EMC filters. For example, the HA series switching power supply of Leader's technology can connect its FG terminal to ground or to the user's chassis to meet the requirements of electromagnetic compatibility.
Protection circuit switching power supply must have overcurrent, overheating, short circuit and other protection functions in the design. Therefore, the switching power supply module with complete protection function should be preferred in the design, and the technical parameters of the protection circuit should be matched with the working characteristics of the power consumption equipment. To avoid damage to the electrical equipment or switching power supply.
The development direction of the development trend of switching power supply is high frequency, high reliability, low consumption, low noise, anti-interference and modularization. Because the switching power supply is light, small, and thin, the hub technology is high-frequency, so foreign major switching power supply manufacturers are committed to the simultaneous development of new high-intelligent components, in particular to improve the secondary rectifier device losses, and in the power iron Oxygen (Mn? Zn) materials have been enhanced in science and technology to achieve high magnetic performance at high frequency and high magnetic flux density (Bs), and miniaturization of capacitors is also a hub technology. The application of SMT technology has made great strides in switching power supplies, placing components on both sides of the circuit board to ensure that the switching power supply is light, small and thin.
The high-frequency switching power supply must be different from the traditional PWM switching technology. The realization of ZVS and ZCS soft-switching technology has become the mainstream technology of switching power supplies, and has greatly improved the operating efficiency of switching power supplies. For the high reliability index, the United States' switching power supply manufacturers have made measures to reduce the stress of the device by reducing the operating current and reducing the junction temperature, which has greatly improved the reliability of the product.
Modularization is an overall trend of the development of switching power supplies. Modular power supplies can be used to form a distributed power supply system. N+1 redundant power supply systems can be designed and capacity expansion in parallel can be realized. In view of the shortcomings of high switching noise, the noise of the switching power supply will inevitably increase if it is pursued independently. The use of the departmental resonant conversion circuit technology can theoretically achieve high frequency and reduce noise, but the sector is in resonance. There are still technical problems in the practical application of conversion technology, so it is still necessary to carry out a large amount of work in this field in order to make this technology practical.
The high frequency of the switching power supply is the direction of its development. The high frequency of switching power supply miniaturization and switching power supply into a wider range of applications, especially in high-tech applications, has promoted the miniaturization and lightweight of high-tech products. Change. In addition, the development and application of switching power supply are of great significance in energy conservation, resource conservation and environmental protection. Power electronics used in switching power supplies are mainly diodes, IGBTs, and MOSFETs. SCR has a small number of applications in the switching power supply input rectification circuit and soft start circuit. GTR drive is difficult, the switching frequency is low, and gradually replaced by IGBT and MOSFET.
Three Prerequisites 1. Switching: Power electronic devices work in the switching state instead of the linear state 2. High-frequency: Power electronics operate at high frequencies rather than low frequencies close to the power frequency. 3. DC: The switching power supply outputs DC instead of AC. Switching power supply classification:
In the field of switching power supply technology, people are developing related power electronic devices while developing switching frequency conversion technology. Both promote each other to push the switching power supply towards light, small, thin, low noise, high reliability, and the annual growth rate of more than two digits. The development of anti-jamming direction. Switching power supply can be divided into two major categories: AC/DC and DC/DC. The DC/DC converter is now modularized, and the design technology and production process are both mature and standardized at home and abroad, and have been recognized by users. However, due to its own characteristics, the modularity of AC/DC has encountered complex technical and process manufacturing issues in the process of modularization. The following describes the structure and characteristics of the two types of switching power supplies.
Grounding switching power supply will generate more interference than linear power supply. Grounding and shielding measures shall be taken for power equipment sensitive to common mode interference. According to EMC limits such as ICE1000, EN61000 and FCC, all switching power supplies adopt EMC electromagnetic compatibility measures. Switching power supplies generally have EMC EMC filters. For example, the HA series switching power supply of Leader's technology can connect its FG terminal to ground or to the user's chassis to meet the requirements of electromagnetic compatibility.
Protection circuit switching power supply must have overcurrent, overheating, short circuit and other protection functions in the design. Therefore, the switching power supply module with complete protection function should be preferred in the design, and the technical parameters of the protection circuit should be matched with the working characteristics of the power consumption equipment. To avoid damage to the electrical equipment or switching power supply.
The development direction of the development trend of switching power supply is high frequency, high reliability, low consumption, low noise, anti-interference and modularization. Because the switching power supply is light, small, and thin, the hub technology is high-frequency, so foreign major switching power supply manufacturers are committed to the simultaneous development of new high-intelligent components, in particular to improve the secondary rectifier device losses, and in the power iron Oxygen (Mn? Zn) materials have been enhanced in science and technology to achieve high magnetic performance at high frequency and high magnetic flux density (Bs), and miniaturization of capacitors is also a hub technology. The application of SMT technology has made great strides in switching power supplies, placing components on both sides of the circuit board to ensure that the switching power supply is light, small and thin.
The high-frequency switching power supply must be different from the traditional PWM switching technology. The realization of ZVS and ZCS soft-switching technology has become the mainstream technology of switching power supplies, and has greatly improved the operating efficiency of switching power supplies. For the high reliability index, the United States' switching power supply manufacturers have made measures to reduce the stress of the device by reducing the operating current and reducing the junction temperature, which has greatly improved the reliability of the product.
Modularization is an overall trend of the development of switching power supplies. Modular power supplies can be used to form a distributed power supply system. N+1 redundant power supply systems can be designed and capacity expansion in parallel can be realized. In view of the shortcomings of high switching noise, the noise of the switching power supply will inevitably increase if it is pursued independently. The use of the departmental resonant conversion circuit technology can theoretically achieve high frequency and reduce noise, but the sector is in resonance. There are still technical problems in the practical application of conversion technology, so it is still necessary to carry out a large amount of work in this field in order to make this technology practical.
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