Soft Start Circuit
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could damage transistors. wires. fuses. circuit breakers. reputations. and power companies. A softstart circuit forces the switcher to bring the output up to its working levels gradually. and draws only a finite amount of current from the mains as it A SOFTSTART CIRCUIT FOR ARCJET IGNITION I“ John A. Hamley* and John M. Sankovic" National Aeronautics and Space Administration I Lewis Research Center Cleveland, Ohio 44135 ABSTRACT The reduced propellant flow rates These inrush limiter circuits not only must function in close cooperation with the input filter circuit, as might be noted, but also must function in very close cooperation with the undervoltage lockout and soft start circuits discussed in the next where the
reservoir.capacitor is charged directly through the mains rectifier, and comparatively complex “softstart” circuits may be needed in order to protect the input components. Several simpler solutions are possible. One is to specify an 10.6. Design. of. SoftStart. Circuit. The socalled softstart means gradually increasing the output voltage of SMPS to the rated voltage at the beginning of poweron to protect the SMPS.The Voutz, output of the zerocurrent detecting circuit is connected to one of the AND gate inputs. This will make the power PMOS close early enough to avoid the extra power consumption, as shown in Figure 5. 3.5 Softstart circuit With Figure 6.43 Autotransformer starting a current b torque that increases the voltage
smoothly,.so eliminating transient current and torque surges. ELECTRONIC SOFT START A commercial soft start consists of a power circuit containing six Soft start acts on the converter control circuit to give a progressively increasing pulse width. This progressive start not only reduces the inrush current stress on the output capacitors and converter components, but it also reduces the problem of When power is applied to Tl and Kl becomes energized, contacts 13 close and apply 24 vac from the CONTACTOR switch S2 to diode CR1, which energizes relay K2 in the soft start circuit. e. Soft Start Relays K2, K3, and Kk. (1) The soft start 105) CSoft.start A SoftStart latch is incorporated to prevent erratic operation of this
circuitry..Two conditions can cause the SoftStart circuit to latch so that the SoftStart capacitor stays discharged. The first condition is activation of an
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