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The working principle and market application of high-power switching power supply
Release time:
2022-01-10
Before we understand the definition and working principle of switching power supply and other issues, today we will discuss what is a high-power switching power supply, as well as the design difficulty of high-power switching power supply; How it works; And the industry use of high-power switching power supply.
Before we understand the definition and working principle of switching power supply and other issues, today we will discuss what is a high-power switching power supply, as well as the design difficulty of high-power switching power supply; How it works; And the industry use of high-power switching power supply.
First, what is the high-power switching power supply, that is, the concept definition
The high power switching power supply consists of PWM control circuit, auxiliary power supply, main power circuit and MCU control circuit. It is through the circuit control switch tube for high-speed turn-on and cut-off, and the direct current is converted into a high frequency alternating current to provide the transformer for transformer, so as to generate one or more groups of voltage required.
The high-power switching power supply can be converted into high-frequency AC because the efficiency of high-frequency AC in the transformer transformer circuit is higher than 50Hz, so that the transformer can be small, and there will be no great heating situation. For the cost control is also relatively low. There are two kinds of switching power supply, one is isolated, the other is non-isolated, the isolated type must have a switching transformer, and the non-isolated need not have.
Second, what are the working principles of high-power switching power supply
The working principle of high-power switching power supply is divided into the following eight points:
1. Ac power input is rectified and filtered into DC;
2, through the high-frequency PWM(pulse width modulation) signal control switch tube, the DC is added to the switching transformer primary;
3, the switching transformer secondary induction of high-frequency voltage, through the rectifier filter supply load;
4, the output part through a certain circuit feedback to the control circuit, control PWM duty ratio, in order to achieve the purpose of stable output;
5, AC power input generally through a kind of things like the current coil, filter out the interference on the grid, but also filter out the interference of the power supply to the grid;
6, at the same power, the higher the switching frequency, the smaller the volume of the switching transformer, but the higher the requirements for the switching tube;
7, the secondary of the switching transformer can have multiple windings or a winding has multiple taps to get the required output;
8, generally should also add some protection circuit, such as no-load, short circuit and other protection, otherwise it may burn the switching power supply.
Third, the attention and difficulty of high-power switching power supply in design
Especially important in the product design of switching power supply is the power margin and reverse voltage resistance of switching tube and all power devices, the turn ratio of switching transformer and leakage induction. So pay special attention to this aspect when designing.
1, from the point of view of the device, for the difficulty in their own design, the first point is the problem of the device, the power is large after the selection of the device brings a lot of trouble, the general device can not work under such a power condition. Therefore, it is necessary to choose a high-power device and be able to work stably for a long time.
2, difficulty in the index problem, switching power supply to reach the product level, must meet national standards, such as output voltage, output power and other data problems, to achieve the stable operation of the product is not very good to do. Relatively difficult is the output power (capacity with load), some power supplies may be very good when the output parameters are good, but after hanging a relatively heavy load, the indicators are rotten. There is also EMC/EMI design, the radiation of the power supply is relatively large, the country has very strict technical indicators in this regard, and it is very difficult to do a good job in the case of high power.
3, the problem of circuit design, due to the large power, circuit design, especially PCB design, also need to be considered. The current is large, need to consider the line, heat dissipation and other issues.
Fourth, the use of high-power switching power supply in the market
Switching power supply products are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, power equipment, instrumentation, medical equipment, semiconductor refrigeration, air purifier, electronic refrigerator, liquid crystal display, LED lamps, communication equipment, audiovisual products, security monitoring, LED light bags, computer cases, Digital products and instruments.
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