Tips and Precautions for Purchasing Switching Power Supplies

The voltage of a switching power supply is determined by the conduction time of the switching transistor, hence it is called a switching power supply. Taking the AC input voltage as an example, choose the appropriate input voltage value for the switching power supply. Generally, the input voltage specifications are 110V and 220V. Therefore, 110V 220V communication switch and universal input voltage (AC: 85V-264V) have three specifications, which should be selected according to the application site. Switching power supplies consume some kinetic energy during operation and release it in the form of thermal energy. So what should be paid attention to when purchasing switching power supplies? The following will mainly introduce the procurement method and usage specifications of switching power supplies.

Taking AC input voltage as an example, BPV10NF selects the appropriate input voltage value for the switching power supply. Generally, the input voltage specifications are 110V and 220V. Therefore, there are three specifications for 110V, 220V communication switches, and universal input voltage (AC: 85V-264V), which should be selected according to the application site.

2. Choose power supply method: When the switching power supply operates, it will consume some kinetic energy and release it in the form of thermal energy. To extend the lifespan of the power supply, it is recommended to choose a model with a maximum power increase of 30%.

3. Pay attention to load characteristics: To improve reliability indicators, it is recommended to choose a 25W-40W switching power supply when the load is 50% -80%, assuming that the commonly used power is 20W.

4. If the motor load, bulb load, or capacitor load has a high current during operation, a suitable power source should be selected to prevent the load. If it is a motor load, the reverse voltage should be considered during shutdown.

In addition, the operating temperature of the power supply, the presence of additional auxiliary cooling equipment, and the operating temperature of the power output should also be considered. The decrease curve of ambient temperature and power.

6. Multiple functions can be selected based on the application: maintenance function: overvoltage maintenance (OVP), temperature maintenance (OTP), overload maintenance (OLP), and so on. Applications: Signal processing (normal power supply, circuit failure), remote control, monitoring, parallel computing, etc. Special functions: Power factor correction (PFC), no power outage (UPS).

7. Select necessary security rules and EMC certification. Determine the required output voltage and current; Power size, device mode, and hole position; There are multiple exports, with each export being 8. Whether Galvanic isolation is required: input voltage scale; The power or power reduction of a switching power supply is determined by the operating temperature. Whether authentication and security rules are required; Power cooling mode: natural cooling or forced air cooling, EMC specifications.

Try to use the standard power supply provided by the switching power supply manufacturer, including the standard size and voltage. In this way, the delivery date is relatively fast; On the contrary, unique dimensions and voltages will increase delivery dates and increase costs.

9. The use of well-known brands and switching power supplies is crucial for electronic products, especially for their safe and reliable operation.

Specification for use of switching power supply

1. The input voltage of the switching power supply can be 220V or 110V, and the input voltage range can be reasonably selected based on the circuit principle. Otherwise, it may cause damage to the switching power supply.

2. Pay attention to identifying the grounding and zero terminal of the switch power supply voltage terminal. Ensure that the switch power supply is grounded reliably.

3. The plastic shell of the switch power supply is generally the same as the ground (FG), and the connection should be reliably grounded to ensure safety. The shell should not be mistakenly connected to the zero line;

4. Before using the switch power supply to complete power on, please double check and verify the connections on each wiring terminal. I believe that input and output, AC and DC, single-phase and multiphase, positive and negative poles, voltage and current values are all correct and can be powered on for operation;

5. For high-power switching power supplies, there are generally two or more "output terminals" - "output terminals, all of which are actually the same output level, just for the convenience of user wiring, multiple terminals are connected in parallel internally;

6. In order to achieve sufficient heat emission, general switching power supply should be installed in a location with good air circulation standards, or installed on the chassis casing according to the casing to transfer heat to the outdoors;

7. Check the resistance load of the switch power supply before leaving the factory. If used for capacitive or inductive loads, it should be indicated in advance in the order contract;

8. Dual switch power supplies export symmetrical loads, with priority given to symmetrical export power supplies;

9. For users with grounded switch power supply FG, it is normal to touch the shell or export the hemp electricity. When floating on the ground, FG has 110V up and down AC power output to the ground, which is determined by the internal structure of the power supply.

10. The switching power supply undergoes 100% full negative aging before leaving the factory. Generally speaking, maintaining the power utilization rate within 80% or lower can greatly improve the service life of the power supply. Generally speaking, the temperature of the power supply decreases by half every 10 ℃;

11. The ripple and noise of a switching power supply are the AC components accumulated on the DC voltage, usually expressed as millivolt peaks;

12. For all switching power supplies, there will be a certain response speed when there is a sudden change in load. During this sudden change period, the output voltage of the power supply will undergo a brief overshoot process, and then return to normal output, i.e. dynamic response.

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