Power control unit protection apparatus

Details Power control unit protection apparatus Power control unit protection apparatus

1994-03-07

1995-09-26

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361103, 323285, 323276, H02H 308

Patent

active

054539048

ABSTRACT:
A power control unit protection apparatus is provided in association with a power control unit for controlling high or low power supply selectively to a loud speaker. The power control unit protection apparatus has an average current detector for detecting an average current supplied to a transformer, a temperature detector detecting the temperature of the transformer, and a timer. When the average current exceeds a predetermined level, and when the temperature rises above a predetermined temperature, timer starts to count a predetermined time. After the count, a cut off signal is produced to cut off the use of the high power supply from the power control unit. Thus, the power control unit protection apparatus prevents breakdown due to overheating of the power control unit including the power supply transformer by limiting the power supplied to the speaker.

REFERENCES:
patent: 4787007 (1988-11-01), Matsumura et al.
English language Abstract of Japanese Laid-open Publication No. 59-11012.
English language Abstract of Japanese Laid-open Publication No. 1-15161.

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