With the increasing reliability requirements of electronic products and the shrinking of energy resources, high reliability and energy-efficient electronic products will be a direction for the development of electronic products in the future. Therefore, in the power supply design of products, it must be fully considered. Reliability and power efficiency.
This paper first analyzes why electronic products have a boot surge, and then analyzes how to use a thermistor to suppress inrush current with a typical power supply circuit. Finally, how to choose the thermistor in practical applications.
Causes of starting surge current
Figure 1 shows a simplified circuit of a typical electronics power supply section. C1 is a filter capacitor in parallel with the load. At the moment of power-on, the capacitor voltage cannot be abruptly changed, thus generating a large charging current. According to the first-order linear non-homogeneous equation established by the first-order circuit zero-state response model, the current value obtained by short-circuiting the filter capacitor can be obtained. This current is what we often call the input surge current. It is generated when the filter capacitor is initially charged. The size depends on the amplitude of the input voltage when the power is turned on and the bridge rectifier and electrolytic capacitor. The total resistance of the loop.
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