Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2006-09-12
2006-09-12
Sterrett, Jeffrey (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S222000, C323S267000, C323S351000
Reexamination Certificate
active
07106037
ABSTRACT:
Disclosed is a switching-type constant current power supply, which comprises an alteration circuit9provided on the output side of a power conversion circuit3together with a voltage detection circuit7, and a feedback circuit8provided between the voltage detection circuit7, a current detection circuit5and a control circuit4. The alteration circuit9is operable, during a current flow period where a load current IL is flowing, to set the signal level of a second feedback signal F2at a value less than a reference voltage Vref to be supplied to a common error amplifier EA1in a control circuit4, and operable, during a current cut-off period where the load current IL is not flowing, to set the signal level of the second feedback signal F2at a value greater than the reference voltage Vref. During the current cut-off period, the feedback circuit8is operable to supply the second feedback signal F2to the control circuit4so as to substantially discontinue the operation of the power conversion circuit3. The switching-type constant current power supply of the present invention can stabilize the load current even under the condition that a load (e.g. display including LEDs) is repeatedly turned on and off.
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Fujitsu Semiconductor Data Sheet, DS04-27203-7E for “Switching Regulator Controller MB 3778”.
Ohsugi Shigeyuki
Ohtake Tetsushi
Sterrett Jeffrey
Toko Inc.
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