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Advantages of high frequency switching power supply module
Release time:
2022-08-08 09:44
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high frequencySwitching power supply moduleThe advantage
high frequencySwitching power supply moduleDC panel is one of the important core components. It plays the role of DC panel rectifier, so it is also called DC panel rectifier module, DC power supply module.
Switching power supply moduleMain functions: When the high-frequency switching power supply system is working normally, the output of the charger runs in parallel with the battery pack to supply power to the conventional load, while floating charging the battery to supplement the self-discharge of the battery. When the AC power supply is interrupted, the battery pack supplies power to the load to ensure uninterrupted power supply. When the AC power supply is restored, the system will automatically charge the battery. When the battery is discharged in a large amount, the system will quickly charge the battery. Line AC/DC power supplies have long been used to convert AC power from the utility grid to DC power for household appliances or lighting. But high-power applications increasingly require smaller power supplies. Linear power supplies are down to specific industrial and medical applications, and their low noise makes them useful. Switching power supplies have largely replaced linear power supplies because of their small size, high efficiency, and ability to handle high power. Figure 1 illustrates the general conversion process of alternating current (AC) to direct current (DC) in a switching power supply.
The main advantages of high-frequency switching power modules are as follows: The built-in microprocessor carries out remote monitoring and various operations on the module, realizing simple wiring for four remote functions, high comprehensive conversion efficiency for installation and debugging of high-frequency switching power supply, and the conversion efficiency of most manufacturers reaches more than 90%, while the conversion efficiency of phase-controlled power supply is generally only 60% ~ 80%. The high frequency switching power supply can be controlled to realize the automatic conversion of battery floating charge and equalizing charge mode.
high frequencySwitching power supply moduleDesigned to ensure that the voltage between the two switches does not exceedUIN, Ud (UIN is the input voltage; Ud is VD1, forward voltage drop is VD2), VD1 and VD2 are fast recovery tubes, and the shorter the recovery time in actual design debugging, the better. Compared with the single-ended excitation DC/ DC converter, there is no need to reset the circuit, which is conducive to simplifying the circuit and transformer design; its power device can choose a lower voltage value; it will also have a large rated power. The working state of the two switches is the same, and they are in the on and off state at the same time. Therefore, it is suitable for intelligent high frequency switching power supply. There are two main power supply designs: linear power supply and switching power supply.
Switching power supply moduleThe linear power supply design uses a transformer to reduce the input voltage, then rectifies and converts it to a DC voltage, and then filters it to improve the waveform quality. Linear power supplies use a linear regulator to keep the output voltage constant. The linear regulator dissipates any excess energy in the form of heat.Switching power supply moduleDesign is a relatively new method that can solve many problems in linear power supply design, including transformer size and voltage regulation. In the design of the switching power supply, the input voltage is no longer reduced, but the input terminal is rectified and filtered.; Then use a chopper to convert it into a high-frequency pulse sequence. Before the voltage reaches the output, it is filtered and rectified again.
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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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