If the CPU is likened to the brain of an electronic system, then the power supply is the heart of the electronic system. With the increasing demand for power in circuit design, isolated power modules have emerged, and how much do you know about isolated power? With the development of the electronics industry, the requirements for power supplies are getting higher and higher, the volume is smaller, and the reliability is higher. Power modules have emerged as integrated devices. The utility model has the advantages of isolation, strong anti-interference ability, self-protection function, and convenient system integration, and is widely used. However, when choosing the right module, you often encounter a parameter "isolation voltage". The higher the isolation voltage, the more expensive the module is. Then you will be curious. What is the isolation voltage, and what level is appropriate? The isolated withstand voltage of the power supply is also called the electric strength in GB-4943. This GB-4943 standard is the safety standard of information equipment that we often say, and is the national standard to prevent people from being physically and electrically injured, including avoiding People are exposed to electric shock, physical damage, explosions, etc. Figure 1 below shows the isolated power supply structure. Figure 1 Isolated power supply structure As an important indicator of the module power supply, the standard test method for isolation withstand voltage is also specified in the standard. For simple test, the equipotential bonding test is generally used. The connection diagram is as follows: Figure 2 Schematic diagram of isolation withstand voltage test Test Methods: · The voltage of the withstand voltage meter is set to a predetermined withstand voltage value, the current is set to a predetermined leakage current value, and the time is set to a predetermined test time value; · Operate the pressure gauge to start the test and start to pressurize. During the specified test time, the module should have no breakdown and no arcing. Note that the welding power module should be selected at the appropriate temperature during testing to avoid repeated soldering and damage to the power module. So what are the advantages and disadvantages of isolated power and non-isolated power? Table 1 Advantages and Disadvantages of Isolated Power Supply and Non-Isolated Power Supply By understanding the advantages and disadvantages of isolated and non-isolated power supplies, they have their own advantages. For some common embedded power supply options, we can observe the following conditions: · The power supply in the front stage of the system is used to improve the anti-interference performance and ensure the reliability. Generally, the isolated power supply is used. · The IC or part of the circuit in the circuit board is powered. In terms of cost performance and volume, the non-isolated solution is preferred. · For the power supply of remote industrial communication, in order to effectively reduce the influence of ground potential difference and wire coupling interference, the isolated power supply is generally used to separately supply power to each communication node; · For battery-powered applications where non-isolated power is required for endurance requirements; · For safety requirements, if you need to connect AC-DC to the mains or medical power supply, you must use an isolated power supply to ensure personal safety. In some cases, you must use a reinforced power supply. In general, the power supply isolation voltage requirement for the module is not very high, but the higher isolation voltage can ensure that the module power supply has less leakage current, higher safety and reliability, and better EMC characteristics. The universal isolation voltage level is above 1500 VDC. Detachable Laptop Stand,Foldable Detachable Computer Stand,Detachable Ergonomic Laptop Stand,Detachable And Foldable Aluminum Laptop Stand Shenzhen ChengRong Technology Co.,Ltd. , https://www.laptopstandsupplier.com
