P0922YU FPS400-24 | FOXBORO | Realize rated output voltage

Description

P0922YU FPS400-24 | FOXBORO | Realize rated output voltage

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The schematic diagram of a conventional ACDC switching power supply is shown in Figure 2. After the AC input is rectified and filtered, it becomes a DC voltage (with a certain ripple voltage), which is then converted into the desired voltage output through a DC-DC converter. The P0922YU FPS400-24 control circuit can adjust the duty cycle (PWM mode) based on input voltage and output load to achieve stable voltage output. After the AC input loses power, the energy stored by the input filtering capacitor supplies power to the output. During this process, the voltage of the filtering capacitor gradually decreases. The control circuit can still achieve the rated output voltage by adjusting the duty cycle until the capacitor voltage drops outside the range that the control circuit can adjust, and the output voltage begins to decrease.

We will illustrate the factors that determine the duration of power outage by giving examples. P0922YU FPS400-24 Assuming a Vo=5V, Po=20W, and efficiency of η= The minimum voltage that can function normally in the DC-DC section of the 0.78 product is Vin_min=100V, and the internal input filtering capacitor of the power supply is Cin=47uF. Assuming that the nominal 220Vac input rectified and filtered voltage is a DC voltage (with a certain ripple in reality), its value Vinynor=308V, according to energy conservation, there is the following equation:

0.5 * Cin * (Vin_mor2 Vin_min2)=St * Po/ η…… (1)

P0922YU FPS400-24 Substituting the numerical value yields: St=77.9ms.

From the above equation, it can be seen that ST is directly proportional to the input capacitance, AC input voltage, and product efficiency, but inversely proportional to the output power and the lowest operating voltage of the DC-DC section.

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