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Bare board power module classification introduction, quick collection!
Release time:
2022-11-24 09:32
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Bare board power modules are widely used in our lives. According to the application fields of modern power electronics, we divide bare board power modules into several categories, which are introduced below.
The first is the green power module. The rapid development of computer technology has brought human beings into the information society, and also promoted the rapid development of power module technology. In the 1980 s, switching power supplies were used in computers and were the first to complete the replacement of computer power supplies, so switching power supply technology entered the field of electronic and electrical equipment. With the development of computer technology, green computers and green power modules are proposed. Green computers generally refer to personal computers and related products that are harmless to the environment, and green power supplies refer to high-efficiency power supplies related to green computers. According to the Energy Star Program of the U.S. Environmental Protection Agency on June 17, 1992, if the power consumption of a desktop personal computer or related peripheral equipment is less than 30 watts during sleep, it meets the requirements of a green computer. Improving power supply efficiency is the fundamental way to reduce power consumption. For a 200-watt switching power supply with 75% efficiency, the power supply itself consumes 50 watts of energy.
The second is switching power supply module. The rapid development of communication industry has greatly promoted the development of communication power supply. Miniaturized high-frequency switching power supply and its technology have become the mainstream of modern communication power supply system. In the field of communication, rectifier is usually called primary power supply, while DC/DC converter is called secondary power supply. The function of primary power supply is to convert single-phase or three-phase AC power grid into DC power supply with nominal value of 48V. At present, in the primary power supply used in the program-controlled switch, the traditional phase-controlled regulated power supply has been replaced by the high-frequency switching power supply. The high-frequency switching power supply works through the high-frequency MOSFET or IGBT, and the switching frequency is generally controlled in the range of 50-100kHz. Within, achieve high efficiency and miniaturization. In recent years, the power capacity of switching rectifiers has been continuously expanded, and the single capacity has been expanded from 48V/12.5A and 48V/20A to 48V/200A and 48V/400A.
Bare board power supply module There are many types of integrated circuits used in communication equipment, and their power supply voltages are also different. In the communication power supply system, a high-power density high-frequency DC-DC is used to isolate the bare board power supply module and convert the intermediate bus voltage into various required DC voltages, which can greatly reduce losses, facilitate maintenance, and facilitate installation and increase. Generally, it can be directly installed on the standard control board, and the requirement for the secondary power supply is high power density. As the communication capacity continues to increase, the capacity of the communication power supply will also increase.
There are also converters, DC/DC converters convert a fixed DC voltage into a variable DC voltage. This technology is widely used in continuously variable transmission and control of trolleybuses, subway trains, and electric vehicles. At the same time, the above control can realize the performance of acceleration, stability and fast response, and can save electric energy at the same time. Replacing rheostat with DC chopper can save electricity by 20-30%. DC chopper can not only adjust voltage (switching power supply), but also effectively prevent harmonic current noise on the power grid side. The secondary power supply of communication power supply-DC/DC converter has been commercialized. The module adopts high frequency PWM technology and the switching frequency is about 500kHz, the power density is 5W ~ 20W/in3. With the development of large-scale integrated circuits, power modules are required to be miniaturized, so it is necessary to continuously improve the switching frequency and adopt new circuit topologies. At present, some companies have developed and produced secondary bare-board power modules using zero-current switching and zero-voltage switching technologies, and the power density has been greatly improved.
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2019-08-06
Product selection and application considerations
The design power of each product of our company will have a certain amount of redundant power, which can run for a long time under full load or even over the rated load. However, for the sake of high reliability and prolonging the service life of the power supply, please do not let the load reach the rated value. It is generally recommended to use 60%-80% of the rated load, and the ambient temperature is recommended to be about 30 ℃, which can be fully loaded at an ambient temperature of 55 ℃, but this will undoubtedly greatly reduce the reliability and service life of the product. In actual use, please pay attention to the two factors of controlling load and temperature. If the ambient temperature is relatively high, it is necessary to reduce the load as much as possible (that is, to increase the load margin and select products with greater output power). On the contrary, if a large load current is required, then try to do a good job of ventilation and heat dissipation, such as placing the power supply module in an open space and increasing cooling fans. The specific value is not absolutely fixed. Generally, it is recommended that the load should not exceed 20% of the rated load when the ambient temperature is 55 ℃, which can keep the product very high reliability. Tip: Please use temperature measuring equipment to evaluate the temperature, and do not rely on skin feeling. Short time and a small proportion of full load, high temperature operation, the reliability and life has little effect. For example: each full load lasts less than 1 minute or half a minute, and the interval is more than 10 minutes, while the load during the interval is less than 15% of the rated load, then even if the operation at 55 ℃ is also possible. Safe Use Warning: Since the bare board series does not have a shell, the input is 220V AC at the same time. The input pins and corresponding terminals of the module are directly connected to 220V. Please pay great attention to prevent short circuit between electric shock and metal objects and ensure that the power supply is disconnected before any touch. Load Requirements for 2. Use of Multiple Output Power Supplies Generally, the voltage accuracy of the output of the multi-output power supply is: the nominal value of the main output is plus or minus 1%, and the nominal value of the secondary output is plus or minus 5%-10%. The first output of the multi-output power supply is the main circuit, and the other output is the secondary circuit. The voltage accuracy and carrying capacity of the main circuit are higher than those of the secondary circuit. Therefore, the main circuit with large current and high voltage accuracy requirements should be generally selected, it is appropriate that the ratio of each current is 50-100%, and the secondary circuit must not be loaded separately under the condition of no load on the main circuit, otherwise the secondary circuit voltage is too low to be used normally. In addition, if the main circuit load is full load and the secondary circuit load is light load, the secondary circuit voltage may increase, otherwise the secondary circuit voltage will decrease, and the reliability and service life will have little effect. For example, if each full load lasts less than 1 minute or half a minute, and the interval is more than 10 minutes, while the load during the interval is less than 15% of the rated load, then even operation at 55°C is possible.
2018-08-29
Application field of switching power supply module
Switching power supply module is applied in several major aspects 1. Electric power, mainly including integrator and electric meter and intelligent electric meter 2. Industrial control, industrial control field 3. Medical treatment, medical equipment, mainly including tire protection instrument, monitor and so on 4. Military industry, military industry is a very widely used aspect. in military equipment. Switching power supply module applications in several major areas.
2018-08-29
Precautions for the use of switching power supply modules
The high-frequency transformer of switching power supply is generally shielded for the first time, which is not described above. Switching power supply is a high-frequency product, PCB component layout for EMI, please pay close attention to this point. If the switching power supply has a mechanical shell, the structure of the shell has a great influence on the radiation, please pay close attention to this point. The parameters of different manufacturers of the main switch tube and the main diode have certain differences, which have certain influence on EMC. Please pay close attention to this point.
2018-08-29
Can switching power supply and module power supply be universal?
A module power supply is a power supply that can be mounted directly on a printed circuit board and is characterized by providing power to application-specific integrated circuits (ASICs), digital signal processors (DSPs), microprocessors, memory, field programmable gate arrays (FPGAs), and other digital or analog loads. In general, such modules are called point-of-load (POL) power supply systems or point-of-use power supply systems (PUPS).
2018-08-29
The difference between switching power supply and module power supply
(1) The difference in use: module power supply, output voltage, remote control switch circuit, input protection circuit. Switching power supply, control the switch tube on and off time ratio, maintain a stable output voltage of a power supply. (2) The difference in composition: Switching power supply: Generally composed of pulse width modulation (PWM) control IC and MOSFET. Module power supply: it is composed of power supply module with a small amount of discrete components.
2018-10-19
Loss of switching power module
The loss of high-power module switching power supply mainly includes high-frequency switching loss, high-frequency transformer loss, rectifier loss and line conduction loss. In the application of low voltage and high current output, the rectifier loss and line conduction loss occupy a larger proportion, the lower the output voltage, the greater the output current, the rectifier loss and line conduction loss accounted for the proportion of the total loss of the module switching power supply.
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