Title:
CONSTANT VOLTAGE POWER SUPPLY CIRCUIT
Document Type and Number:
Japanese Patent JPS58214921
Kind Code:
A
Abstract:
PURPOSE:To suppress a sudden change of power supply voltage, by providing an auxiliary power supply circuit which generates the constant voltage of a prescribed threshold value in parallel to a constant voltage circuit which delivers the voltage corresponding to the reference voltage. CONSTITUTION:An auxiliary power supply circuit which generates the constant voltage equal to the voltage of a prescribed threshold value is provided in parallel to a constant voltage circuit using an operational amplifier and a control transistor. For instance, an auxiliary power supply circuit 6 is cut off in a steady state, and the constant voltage V is supplied to an output terminal 2 from a constant voltage circuit 5 consisting of an operational amplifier 3 and a control transistor TRQC. If the load connected to the terminal 2 varies suddenly and lowers suddently the level of a load line 4, a current is supplied to the terminal 2 from a power supply 1 through a control TRQ4. Then the output voltage V1 is pevented by the circuit 6 from lowering less than the level of the voltage several tims higher than the threshold value of a control TR which constitutes the circuit 6.
Inventors:
KUDOU IKUO
MAJIMA TOSHIYUKI
YASHIKI NAOKI
SUZUKI KAZUYUKI
MAJIMA TOSHIYUKI
YASHIKI NAOKI
SUZUKI KAZUYUKI
Application Number:
JP9781782A
Publication Date:
December 14, 1983
Filing Date:
June 09, 1982
Export Citation:
Assignee:
HITACHI LTD
HITACHI IRUMA DENSHI KK
HITACHI IRUMA DENSHI KK
International Classes:
G05F1/56; G05F1/59; (IPC1-7): G05F1/56
Attorney, Agent or Firm:
Toshiyuki Usuda
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