1.开关电源(SMPS)：
通常用于将其从特定的DC电压更改为另一个DC电压电平，通常将电源电压降低到较低的电平，以便需要较低电压的组件可以使用它。
2.不间断电源(UPS)：
它用于在固定时间内为设备供电，即使没有输入电源也不会停止。
SMPS和UPS之间的区别：
| Parameter | UPS | SMPS |
|---|---|---|
| Power Conversion | Provides A.C supply when power fails. | Converts A.C to D.C power. |
| Transformers Used | Low-frequency transformers used. | High-frequency transformers used. |
| Backup | UPS have backup capabilities. | SMPS don’t have any kind of backup capability. |
| Power Storage | Power storage equipment is used to store the incoming supply. | No power storage equipment used. |
| Pricing | It is usually costlier than SMPS. | Prices are usually lower than UPS. |
| Placement | Usually outside the cabinet. | Inside the cabinet. |
| Size | Usually, the size is slightly bigger than SMPS. | Usually, Smaller than UPS. |
| Electronic Components | Rectifier, UPS Batteries, Inverter, Static Bypass Switch. | PWM Oscillator, HF rectifier, MOSFET switch. |
| Popular Manufactures | Schneider, Luminous, Su-Kam, Genus Power. | Marc Computers, Thermaltake, Zebronics. |