ST40002B

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Inrush current limiters (ICL) play a key role in controlling electrical current. Applying inrush current limiters to electrical systems help to avoid surge power of electrical equipment and reduce power consumption, thus minimizing and limiting any potential harm to people and property during power up or switch on. The ST40002B is a type of inrush current limiters, which features excellent controlling performance and low energy loss. In this article, we will discuss the application fields and working principles of the ST40002B.

The ST40002B is capable of controlling inrush current up to 10A and is mainly used in AC switching power supply systems. It is designed to solve power on surge and instantaneous current of lighting lamps, hold up capacitance start motor current, and power off switch current of various electronic equipment. Furthermore, the ST40002B has a variety of control modes, such as mode 1 control which helps reduce cold power and also bypass current; mode 2 control for hold-up capacitance start motor current; and mode 3 control for power-off switch current of various electronic equipment.

Having discussed the various application fields, let us take a look at the working principle of the ST40002B. The ST40002B adopts a rapid reset circuit design, which is able to quickly restive load current and store electric energy. An internal two step control method makes it possible for ICL to maintain an optimized low current level before the main power switch triggered. When the main power switch is switched on, the current will be rapidly limited in two steps. The first step is for the fast current limiting. When the current value is reached the limitation level, it will be switched to the second step. In this step the current will pass through the grid resistor at constant voltage mode, in order to strictly limit the peak value of the inrush current. When the current returns to a normal level, then the ICL can transfer the load to the supply power.

The working principle of the ST40002B is further enhanced by its unique reset circuit construction. The reset circuit includes a recovery resistor and a small capacitor. The recovery resistor\'s resistance is adjustable, allowing precise control and adjustment of the time it takes to reset the ICL. The small capacitor acts as an energy storage device, allowing it to recover its capacity quickly and perform reset accurately. This adds greatly to the overall performance of the ICL and allows it to work fast in situations that require fast control.

To conclude, the ST40002B is an inrush current limiter which features excellent controlling performance and low energy loss. Its multiple control modes, rapid reset circuit design, and unique reset circuit construction allow it to be used in a wide range of applications, including AC switching power supply systems, cold power, hold up capacitance start motor current, and power off switch current of electronic equipment. With its robust design and performance, the ST40002B has become a popular choice for various commercial and industrial applications.

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