INDUCTION LOAD SOFT-STARTER

PURPOSE:To optimize the starting of an induction load, by computing the optimum starting condition of the induction load with an A/D converter and a computer, and by suppressing transient current to optimize the condition. CONSTITUTION:When a power source is made, then respective set values coming f...

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Bibliographische Detailangaben
1. Verfasser:	UEDA SUKENORI
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PURPOSE:To optimize the starting of an induction load, by computing the optimum starting condition of the induction load with an A/D converter and a computer, and by suppressing transient current to optimize the condition. CONSTITUTION:When a power source is made, then respective set values coming from starting voltage, full load voltage, and a full load are read by a micro-computer 20. A voltage value is read out of an A/D converter 200, and a current value is read out of an A/D converter 202. Based on the the data a situation is discriminated, and the output of the ignition command of a TRIAC is generated. Then, a zero-cross point difference between voltage and current is computed, and is set to be a phase difference, and when the phase difference is increased, then the output of signal for driving an ignition circuit to reduce the ON-time of the TRIAC is generated.