Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1998-02-19
1999-06-29
Nguyen, Matthew
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
361 18, H02M 3335, H02H 700
Patent
active
059177160
ABSTRACT:
A switching mode power supply which protects against circuit damage when an abnormal state such as the disconnection or short circuit of a load occurs. The switching mode power supply includes a pulse width modulation controller, a switching transistor, a switching transformer having a primary coil, secondary coils, and a tertiary coil, an error detection and feedback part connected to a secondary coil, and an abnormal voltage detecting part connected to the tertiary coil. The pulse width modulation controller controls the on time and off time of the switching transistor in order to control the switching transformer, and to thereby control the supplied power. The pulse width modulation controller receives error information detected by the abnormal voltage detecting part and also error information detected by the error detection and feedback part. The abnormal voltage detecting part includes a zener diode and senses whether a voltage induced at the tertiary side coil of the switching transformer is normal or abnormal. The abnormal voltage detecting part immediately stops a pulse width modulation operation when an abnormal voltage is detected at the tertiary side coil, in order to prevent circuit damage. The error detection and feedback part also detects errors and supplies the pulse width modulation controller with feedback, in order to prevent circuit damage.
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Bushnell Esq. Robert E.
Nguyen Matthew
Samsung Electronics Co,. Ltd.
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