DISTRIBUTION TYPE POWER SUPPLY UNIT WITH PROTECTIVE FUNCTION FROM OVERCURRENT

• Main Authors: KOSHIN HIROAKI, MUKAI CHUKICHI, YUASA HIROAKI, KUNIMOTO YOICHI, HIGASHIHAMA HIROTADA
• Format: Patent
• Language: English
• Published: 14.01.2000
• Edition: 7
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

PROBLEM TO BE SOLVED: To reduce the burden of a central processing unit of a power supply unit and protect itself quickly from overcurrents. SOLUTION: A distribution type power supply unit 1 with a protective function from overcurrents in provided with an inverter bridge circuit 5, a central processing unit 7 for outputting a PWM control signal a driving circuit 8 for driving the inverter bridge circuit 5 based on the PWM control signal, and an output-current sensing circuit 9 for outputting an output-current level signal proportional to an output current I of the power supply unit 1, operates linking to a commercial power system AC by the unit 1 converting a DC power into an AC power through a pulse width modulation, and protects itself from overcurrents if the output-current level signal exceeds an overcurrent reference level. In this power supply unit 1, there are provided an overcurrent-signal generating circuit 10 for comparing the output-current level signal with the overcurrent reference level and outputting an overcurrent signal when the output-current level signal exceeds the over current reference level and a PWM-control- signal interrupting circuit 11 for interrupting the PWM control signal to stop the output current of the power supply unit 1 when receiving the overcurrent signal.