When thinking about AC chargers, we usually focus on their power output—30W, 65W, or even higher.

But what determines the safety and reliability of a charger?

It's our tiny electronic components, of course, silently performing tasks such as power conversion, voltage control, and surge protection.

Let's take a look at how they protect the circuitry of an AC charger.

1️⃣ Converting AC to Usable DC

We know that wall sockets provide AC power. However, electronic devices use DC power. Therefore, the primary task of a charger's circuitry is to convert AC to DC. This is typically done by rectifier diodes or bridge rectifiers.

2️⃣ Eliminating Ripple

After rectification, the voltage is not perfectly smooth; there will be ripple and noise.

This is where capacitors and inductors come in to reduce voltage fluctuations, filter out electrical noise, and improve electromagnetic interference performance.

3️⃣ Maintaining Stable Output Voltage

The charger must maintain a stable voltage. When there are input voltage fluctuations, sudden load changes, or temperature increases, Zener diodes and MOSFETs come into play to help regulate the voltage.

4️⃣ Preventing Surges and Abnormal Conditions

AC chargers are susceptible to input surges, voltage spikes caused by lightning strikes, and sudden load switching.

TVS diodes and varistors are needed to clamp these high-voltage spikes before they damage the circuitry.

5️⃣ Achieving Efficient Power Switching

Modern chargers rely on high-frequency switching to improve efficiency and reduce size. In this case, power MOSFETs act as high-speed switches controlled by PWM signals.

Summary

From rectification and filtering to voltage regulation and surge protection, discrete components are indispensable for ensuring charger reliability.

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