By Jestine Yong
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Additional info for Troubleshooting & Repairing Switch Mode Power Supplies
The full explanation of these components can be found in chapter 5 (Electronic Components Found In SMPS and Possible Causes). B) Over Voltage Protection (OVP) The function of the OVP circuit is to monitor the start up DC supplied to the power IC. If the designers did not place this OVP circuit in the primary side, then they will definitely design at least one in the secondary side. It senses the over voltage conditions and shut down the power supply if they occur. Once it is shut down, you need to remove the AC main and replug to get it turn on again.
For your information the Blue ESR meter has the function to check very low ohms resistor value. 24. 23 except that now the Power FET is already integrated into the Power IC (pin 1 and 2). When the Power FET is turned On, current flows through resistors R827 and R828 (current sense resistors) and a voltage develops at the over current protect (OCP) terminal at pin 4. 5 volt, the internal OCP comparator turns the Power FET Off and stops its current flow. 25 in the next page. 25- OCP Circuit In Secondary Side This circuit is a 5 volt secondary protection.
The power IC generates output pulse waveform (drive signal) to the power FET through the gate pin and the power FET started to switch on. When the switch is turned “On”, the transformer primary winding charges (energy stored) and when the switch is turned off, the energy in the primary winding will be transferred (discharges its stored energy) into the secondary. In other words, switching the primary winding of the transformer “On” and “Off” will result in secondary voltage. This also shows that by controlling the switch’s on/off time (from the power IC) we can obtain necessary secondary voltage.