Soft-Start Controller

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Soft start motor controller reduces the load and torque in power train and electric surge during start up in order to reduce the mechanical stress and on mechanical components.

Soft starts limit Inrush Current and improve stability of the power supply.

Soft start controller when searching indicates this device is a motor control, and heavily used in high power circuits. Refining the search for low voltage implementation resulted in the finding of the following detailed research article:

https://www.researchgate.net/figure/Soft-start-circuit-in-IC-UC2526_fig2_324562901

https://www.researchgate.net/publication/324562901_Digital_Soft_Start_Implementation_for_Minimizing_Start_up_Transients_in_High_Power_DAB-IBDC_Converter “The soft-start feature is commonly used in PWM (Pulse Width Modulation) controller ICs, which are currently available on the market, such as the UC1526, UC2526, TL594, LM5045, BM1P107FJ, and UC3526. This limits the inrush current and avoids the overshoot voltage at the output during start-up transients.”

The inrush current is the maximum current drawn by a converter for a very few milliseconds while being freshly energized. Although it appears for only a very few milliseconds, it can cause severe damage to the entire energy storage system, including the sources and loads. To save the RESS system from the starting inrush current and peak overshoot voltages, this paper proposes a five-phase digital soft-start control algorithm for a high-power DAB-IBDC converter that was implemented at a renewable energy storage system aimed at developing an intelligent self-powered energy zone.

“A DAB-IBDC converter consists of two full bridge circuits isolated by a high frequency transformer with a leakage inductance”