source:Industry News Popular:adapter release time:2022-01-13 09:18:00 Article author:sznbone
1. Output overvoltage protection circuit one:
Due to uncertain factors or internal failure of the power supply, the output voltage is higher than the rated value, and the over-voltage protection circuit is triggered to clamp its voltage at the set value, so as to achieve a stable output voltage value, such as a 12v2a power adapter, under the influence of a certain fault As a result, the output voltage is higher than 12V, and the overvoltage protection circuit will clamp the voltage at the rated value of 12V.
When the output is overvoltage, when the voltage applied to VD3 is greater than its regulated value, VD3 is turned on, the output voltage is clamped, and at the same time, it feeds back to the primary side through IC4.
advantage:
Simple circuit design and low cost
shortcoming:
The deviation of the voltage regulator VD3 will cause the voltage clamp point to float up and down
Application Notes:
VD3 should choose a voltage regulator tube with a good temperature coefficient, and components that need to be debugged, such as R32, should consider multiple parallel connections to facilitate debugging.
When the overvoltage protection circuit is active, the circuit is in an abnormal working state. For circuits with the function of output voltage up and down adjustment, the over-voltage protection point should be greater than the maximum value of the output voltage up and down
2, output over-voltage protection circuit two:
Output over-voltage protection circuit: Like the over-voltage protection circuit, when the output voltage is higher than the rated value, the protection circuit is triggered, but the circuit structure is different.
When the output is overvoltage, Va>Vref, IC3 is turned on, and feedback to the primary side through IC4, the output voltage stabilizes at the set overvoltage protection value.
Advantages: The output overvoltage protection value can be accurately set.
Disadvantages: The cost is slightly higher than the voltage regulator clamp method.
Application Notes:
When the overvoltage protection circuit is active, the circuit is in an abnormal working state. For circuits with the function of output voltage up and down adjustment, the overvoltage protection point should be greater than the maximum value of the output voltage up and down.
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