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What does soft start mean - Inverter 1000-2000w Peak Surge Power

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Soft start will slowly ramp up the current to the load preventing a surge of current from a cold start. It is similar to having an automobile and pushing the accelerator to the floor to accelerate from a stop using maximum engine horsepower. A soft start would be to accelerate gradually from a stop to the maximum engine horse power which would prolong the life of the motor.

Posted on May 23, 2011


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What is a soft start?

Recently, the growing market of portable electronic devices brings greater demands for power management integrated circuit (PMIC). Among different PMIC, DC-DC converter is important in regulating the power supply, due to its high efficiency, capacity of outputting current and small static current . However, an inrush current and overshoot voltage appears in the startup period of the DC-DC converter, which may causes damage to the whole system and the load. Thus, a so called soft-start function is adopted during the startup stage of the DC-DC converter, which smoothly conducts the output voltage and current in the inductor to the steady state.In a typical DC-DC converter, as in Fig.1 a Buck system, a negative feedback is applied to build a system that automatically adjusts the duty cycle to obtain a given output voltage maintaining steady under all conditions [2]. Usually the output voltage is measured with a factor of H. The sensed output signal Vfb is compared with a reference voltage Vref. The negative feedback loop makes the sensed voltage accurately follows Vref, so that a constant Vout achieved. Accordingly, Vref can be replaced by a ramp signal during soft-start, holding the output voltage to climb bit by bit. As the duty cycle is limited, an inrush current can also be suppressed. During soft-start stage, a ramp voltage VSS is generated from a capacitor charged by a current bias. The smaller one VSS is added to the feedback loop, compared with Vref by a comparator, until it reaches Vref. The drawback of this method is that the soft-start capacitor CSS is usually too large to be integrated on chip, which means additional pin and PCB area. Furthermore, voltage spike may still occur at the end of the soft-start, because two control signals Vref and VSS are put through at the same time by comparator, and compared to feedback voltage Vfb, To DO A SOFT-START First, a whole power up the system is enabled by signal ENA, a simple bias is initiated.The LDO (Low dropout regulator) works by this rough bias.When the LDO is stable, it outputs power supply to a precision bandgap. BG_ready signal will go high when the precision bandgap stably works. The bias of LDO will change from a simple one to a precision one, leading to a more precision LDO output. When the power up process is over, an LDO_ready signal is sent all over the chip, and the rest of the chip will work then. This whole process will guarantee a safe power environment to sensitive analog modules. This LDO_ready signal will also tells the state control module to change the stage form SD (shut down) mode to SS (soft start) mode. When the soft-start is accomplished, an SS_ok signal will switch the stage to NM (Nmoral operation) mode. Furthermore, the entire protection signal can be incorporated in the state module to boot different operation stage...hope this helps

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Do you mean it won't switch on?
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Do you mean it won't switch on or charge?

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