Switch power supply, switching power supply of choose and buy 】 【 how to choose the switching power supply buying guide
1, choose the appropriate input voltage range. AC input, for example, the commonly used 110 v input voltage specification, 220 v, so there will be a corresponding 110 v, 220 v AC switching, and general input voltage (85 v to 264 v AC:) three kinds of specifications. The selected input voltage specification should be used according to the region.
2, select the appropriate power. Drains part of power switching power supply in the work, and released in the form of heat. In order to make the life of the power supply growth, suggest use 30% more power output rating model.
3, considering the load characteristics. In order to improve the reliability of the system, it is recommended that the switching power supply work in 50% 80% load is preferred, namely the assumptions used to 20 w, should choose the output power of 25 w - 40 w switching power supply.
If the load is motor, bulb or capacitive load, when boot instantaneous current is larger, should choose appropriate power so as not to overload. If the load is the motor should be considered when downtime when voltage flow backward.
4, in addition, still need to consider the power of the work environment temperature, and the presence of additional auxiliary cooling device, the temperature too high a ring of power to deduction output. Need to refer ring temperature deduction curve of output power.
5, according to the application needs to choose the function:
Protection function: over voltage protection (OVP), over temperature protection (OTP), over load protection (OLP) and so on.
Application functions: signal function (normal power supply, power supply failure), remote control, telemetry, parallel, functions, etc.
Special features: power factor correction (PFC), constant power (UPS)
6, choose needed to comply with safety and electromagnetic compatibility (EMC) certification.
According to the usage, set to the output voltage and current; The size of the power supply, installation and mounting holes; Whether you need several road output, each output electrical isolation; The input voltage range; Determined according to the environmental temperature, derating of switch power supply, power supply power; Do you need certification and safety standards; The power of the cooling method: natural cooling or forced air cooling; Emc standards.
7, try choosing factory standard power supply, including the standard size and the output voltage. So the goods time is faster; On the contrary, the size and the output voltage of the special, will extend the goods time, increase the cost.
8, choose brand. In the heart of electronic equipment, switch power supply to safe and reliable operation of the electronic equipment has a vital role. So choose the brand of switch power supply is also very important.
Links: dongguan city teng MAO electronic technology co., LTD. The main research and development production: switch power adapter, LED power supply, LED drive power supply, waterproof power supply, power supply of high power devices, quick charger, QC3.0 charger, TYPE - C charger, conversion pin charger, car charger, printers, power panel.
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