Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1996-03-06
1998-07-28
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
361 79, 361 87, 361 93, 323284, H02H 300
Patent
active
057869707
ABSTRACT:
A stabilized power source circuit is provided with an over current protecting circuit which obtains either a current value or a voltage value corresponding to an output current value of an output transistor as a detected value, compares the detected value with a predetermined constant value and lowers the output current when the detected value exceeds the predetermined constant value. A comparing value generating circuit receives an external signal, generates one of either a predetermined plurality of voltage values or a predetermined plurality of current values in response to the level of the received external signal and transmits the same to the over current protecting circuit as the predetermined constant value. Either the predetermined plurality of voltage values or the predetermined plurality of current values are provided so as to correspond to the respective output current values to be detected as the respective over currents of the output transistor and an inherent rated current value of the output transistor is selected to be equal to or larger than the maximum value among the respective output current values to be detected as the over currents of the output transistor.
REFERENCES:
patent: 5375029 (1994-12-01), Fukunaga et al.
patent: 5428287 (1995-06-01), Agiman
Fujihara Susumu
Nao Yuhji
Fujitsu Ten Limited
Gaffin Jeffrey A.
Rohm & Co., Ltd.
Sherry Michael J.
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