Application environment analysis of power supply application problems
With the popularization of electronic products, the application range of power supply is getting wider and wider. From industrial, civilian to medical, these application scenarios have different characteristics, and the environment of the application field is complex. Each factor affects the performance and reliability of power supply products. have a greater impact. With many years of experience in the power supply industry, Jinshengyang analyzes the typical application environment factors of switching power supplies, uses simulation tests, and field use to optimize power supply performance and designs Jinshengyang power supply products that match the application environment.
This article will analyze the impact mechanism of application environments in different fields on power supply products.
2. Industrial field
The industrial fields where power supply products are usually used mainly include electric power, machining, automation, metallurgy, mining, vehicle and other applications. In the industrial field, we focus on the reliability of power supply products. The following describes the typical application environment factors in these industrial fields .
Typical application environment factors in the industrial field
The environmental application of power products in the industrial field mentioned in this article is limited to simple climate protection places. These places are not directly attacked by climatic factors such as sun, wind, and rain, but are indirectly affected by them. In addition, these environments are directly affected by industrial pollution. Therefore, the main environmental factors faced by power supply products in the industrial field environment can be divided into the following categories:
Typical application environment factors and their impact analysis
1) temperature
High temperature conditions: increase the failure rate of electronic components and reduce the life span. For example, the life span of electrolytic capacitors will decrease sharply under high temperature conditions. Generally speaking, within the limit temperature, the life span will be reduced by half for every 10°C increase in temperature;
Low temperature conditions: change the physical properties of the material, such as the freezing of the electrolyte of the electrolytic capacitor and the decrease in capacity, making it difficult or impossible to start the power supply.
Due to the wide application area of industrial products, large temperature difference between day and night, and wide temperature range, temperature changes will cause the parameters of electronic devices to drift, resulting in equipment malfunction, thermal expansion and contraction, mechanical structure inflexibility or stuck phenomenon.
Therefore, we should choose a power supply that has a wide operating temperature range and can withstand high and low temperature shocks. The temperature drift characteristics of device parameters are fully considered in the design of Jinshengyang power supply products, and the selection of devices also fully considers the operating temperature range and leaves a corresponding margin.
2) air pressure
Air pressure is closely related to altitude. In high-altitude areas, due to the reduction of air density, the heat dissipation performance of the product will be significantly reduced. Therefore, in the thermal design, the system should have sufficient margin, and the heat-generating devices should have a larger derating.
As the air pressure decreases, the corona voltage of the product will decrease and the external insulation strength will decrease. Generally speaking, within the altitude range of 0-5000m, the air pressure of electronic products decreases by 12% (equivalent to an altitude increase of 1000m), and its insulation strength decreases by 8-13%.
Therefore, product design in high-altitude application environments must fully consider component derating, heat dissipation, and enhanced safety regulations. For high-altitude applications, it is recommended to use Jinshengyang power supply that can meet the altitude of 5000 meters.
3) Humidity
In summer in southern my country and tropical rainforest areas around the world, high relative humidity and high temperature often occur.
4) Gel cream
Condensation is prone to occur in areas with large temperature differences between day and night, rapid temperature changes, or areas with a lot of rain and fog; for some products that work intermittently, if they are turned off at night and are in a cold state, condensation may also occur when they are turned on in the morning due to high ambient temperature and humidity. The main effects of condensation on the product are electrical short circuit, insulation strength drop, and electrochemical corrosion.
5) Dust
Hygroscopic conductive dust: It will be deposited on the surface of the power supply PCBA. After it absorbs moisture, it will greatly reduce the insulation properties of the product and corrode the product components.
Conductive dust: It exists in a large number of industrial environments. Its main impact on power supply products is the reduction of insulation resistance, causing ignition and arcing; forming a short circuit path, causing device burnout and bombing.
6) Salt spray
Salt spray corrosion will have a great impact on the long-term reliability of power supply products. The subsidence of the circuit board may cause short-circuit failure, so in order to prevent the metal parts from being corroded, the structural design and processing technology of the product must take necessary protective measures into consideration.
7) Corrosive gas
Corrosive gases often appear in the industrial environment. The main components of corrosive gases may include Cl2, H2S, NO2, SO2, etc. Their impact on products is mainly due to the combination of factors such as humidity and temperature, which can lead to metal corrosion, Plastic rubber aging deformation, etc. Buy electronic components in stock on Weiyang Mall
Jinshengyang specifically provided products such as single-sided conformal paint version power supply, double-sided conformal paint version power supply, semi-potted power supply, plastic-encapsulated module power supply, and glue-filled module power supply, and targetedly strengthened the surface treatment of the power supply casing. It can well cope with the application environment of high humidity, frost, dust and corrosive gas.
8) Grid fluctuation environment
The fluctuation of grid voltage amplitude is very harmful to electrical equipment. In cities and industrial areas with better power supply, the change range is usually only about ±15%, while in areas with poor power supply conditions, or where there are equipment with large load changes in the power grid, such as mountainous areas, road tunnels, charging piles, power generation Sometimes it can even reach 20%~30% in occasions such as machine power supply.
The grid voltage fluctuation range of conventional switching power supply is 15%, which is 264VAC. If the voltage exceeds 264VAC, the power supply may be damaged, and even cause equipment tripping and fire in severe cases.
In view of the unavoidable fluctuations in the power grid, Jinshengyang has developed the "305 full working condition" series switching power supply. In addition to meeting the general normal environmental conditions, the product can also be used for a long time for input voltage (305VAC), working temperature and humidity, and altitude. , electromagnetic interference and other harsh environments and special environments with higher requirements.
3. Civilian fields
The civilian applications of power supply products mainly include lighting, home appliances, display screens, broadcasting and other applications. In addition to reliability in the civilian field, we also focus on safety, ease of installation, and high cost performance.
Products in the field of civil products, because they will be in direct contact with the human body, have higher safety requirements than industrial applications, such as higher withstand voltage requirements, power isolation requirements, overcurrent, overvoltage and overtemperature protection, etc. .
4. Special application fields
In addition to conventional industrial and civil applications, power supplies also have some special applications. These fields have strengthened the definition of certain parameters, such as the medical industry, which puts forward higher requirements for safety distance and leakage current.
