4 protection features of laptop power adapter
Judging from the usage of most users, laptops will be under light load or standby conditions for quite a while. Compared with improving energy efficiency under 25%, 50%, 75% or 100% load conditions, it is more challenging to reduce energy consumption and improve energy efficiency under extremely low load conditions or even standby conditions. This requires the power controller to have excellent light load or standby energy consumption performance.
In addition, the laptop power adapter also requires the following protection features:
The first type: short circuit protection (SCP)
It must be able to withstand the continuous short circuit of the output without damage. When the fault disappears, the adapter must be able to recover from protected mode and provide rated power again.
The second type: overvoltage protection (OVP)
In the case where the loop is broken, such as the damage of the optocoupler or the TL431 voltage divider network is affected, the power adapter must immediately stop working and remain in this state until the user restarts the adapter.
The third type: over temperature protection (OTP)
If the temperature of the power adapter exceeds a certain temperature value, there is a risk of damage to the adapter. In order to avoid this situation, it is necessary to use a thermal sensor to continuously monitor the temperature, and when the temperature exceeds the limit set by the designer, the adapter will continue to shut down. When the user restarts the power supply and the temperature drops, the power adapter resets.
The fourth type: over power protection (OPP)
For some power supplies, it is important that under the worst conditions-such as the current consumed by the load is too large, the maximum output current remains in a controlled state without actually appearing a short circuit.