What is the maintenance method of switching power supply?
1, repair the switching power supply, first use the multimeter to test the breakdown of the short circuit power components, such as power rectifier Bridge, switch tube, high frequency high power rectifier; The high-power resistor that inhibits surge current burns out.
Detect the output voltage Port resistance is abnormal, damage the above part needs to be changed.
2, ** after the completion of the step, in the open power supply can not work properly, then detect the power factor module (PFC)And pulse width modulation (PWM)
Components, please refer to the relevant information, familiar with the normal working module of each foot function and necessary conditions of PFC and PWM modules.
3. Then, the power PFC circuit measures that the filter capacitor voltage at both ends is about 380 v dc. If you have 380 v dc voltage, the PFC module works normally and then detects the working state, the VC and VR reference voltage output terminals of the PWM module power supply are measured. The Sonic start/Vcontrol of the start control voltage is normal. 220 vac/220 vac isolation transformer and switching power supply are used, the CT of the waveform that uses the oscilloscope to observe whether the PWM module ends is a linear sawtooth wave and a triangle, such as TL494 CT end sawtooth wave, FA5310 its CT is a triangle wave.
The output terminal V0 waveform is an ordered narrow pulse signal.
4. Practical maintenance of switching power supply. There are many PWM switching power supplies and UC38 x series 8-pin components. Most of the power supplies cannot work because the power starting resistance is damaged or the chip performance is degraded.
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