In order to ensure the safety of the power adapter, engineers need to optimize the circuit design and ensure that the circuit system can operate efficiently and safely for a long time. Therefore, as a component that can achieve voltage suppression protection for circuits, varistors have been fully used in the daily design process.
For engineers who have been engaged in power supply design or adapter design industry, varistor is a relatively familiar term. This resistor is a commonly used electronic component in work. It has the function of transient voltage suppression and is generally used in the circuit surge and transient protection circuit of the adapter in the design. Under normal working conditions, varistors can protect important components such as integrated circuits and other circuits and equipment from electrostatic discharge, surges and other transient currents - such as summer lightning strikes, thunderstorms, etc. of damage.
In the circuit design process of the adapter, under normal circumstances, the varistor can be directly connected to the protected circuit in parallel. After the parallel connection is completed, when the voltage of the circuit system is instantaneously higher than the limit value, the resistance value of the resistor will drop rapidly, and the large current will be quickly conducted to prevent the instantaneous overvoltage and play a protective role. When the input voltage is lower than the working voltage of the resistor, the resistance of the varistor is extremely high, almost open circuit, so it will not affect the normal operation of the device or electrical equipment
For the power adapter connected to the varistor, the fire circuit and the inrush current generated during its operation will be effectively offset. When the overvoltage pulse is superimposed on the power supply network, after connecting the varistor, the overvoltage peak waveform is flattened and limited to a certain range. When the overvoltage pulse is superimposed on the power supply network, after connecting the varistor, the overvoltage peak waveform is flattened and limited to a certain range. When switching on or off a load circuit with inductive and capacitive load, the DC waveform will have switching spikes, and the varistor can absorb this back electric potential in the circuit, thereby effectively protecting the switching circuit from damage.
In the circuit system design stage of the power adapter, the varistor can be used to cleverly complete the circuit protection work. The resistor itself has the advantages of resistance to inrush current, small temperature coefficient of resistance, small size, etc., which can be integrated in the premise of small packaging requirements. to help the adapter work safely and stably.