Electronic system for reducing power supply voltage
AssigneePENTAX Corporation
InventorSatoshi Takami
Life of this patent
Estimating the term…
Abstract
There is provided a method of reducing a power supply voltage which is supplied from a voltage regulator to at least one particular circuit, the voltage regulator being configured to adjust its output voltage by use of an external output voltage setting circuit connected thereto, a switching element being used to connect an output voltage setting terminal of the voltage regulator to a ground via a predetermined resistance. The method includes turning off the switching element so that the output voltage of the voltage regulator is set at a preset power supply voltage for enabling the at least one particular circuit, and turning on the switching element so that the output voltage of the voltage regulator is reduced to a predetermined voltage lower than the preset power supply voltage.
Claims12
A method of reducing a power supply voltage which is supplied from a voltage regulator to at least one particular circuit, said voltage regulator being configured to adjust its output voltage by use of an external output voltage setting circuit connected thereto, a switching element being used to connect an output voltage setting terminal of said voltage regulator to a ground via a predetermined resistance, the method comprising:
- turning off the switching element so that the output voltage of said voltage regulator is set at a preset power supply voltage for enabling said at least one particular circuit;
- and
- turning on the switching element so that the output voltage of said voltage regulator is reduced to a predetermined voltage which is lower than the preset power supply voltage.
A power supply voltage reduction system for reducing a power supply voltage which is supplied to at least one particular circuit from a voltage regulator, comprising:
- an output voltage setting circuit that is connected to said voltage regulator to adjust an output voltage of said voltage regulator;
- a switching element that is used to connect an output voltage setting terminal of said voltage regulator to a ground via a predetermined resistance;
- and
- a controller that controls an on/off state of said switching element, wherein said controller switches said switching element to one of the on and off states so that the output voltage of said voltage regulator is reduced to a predetermined voltage which is lower than a preset power supply voltage.
A CCD driving system comprising:
- a CCD driving circuit that outputs a driving signal for driving a CCD;
- a timing generator that generates and outputs a pulse signal for driving said CCD driving circuit;
- a voltage regulator that supplies a preset power supply voltage to said CCD driving circuit and said timing generator;
- an output voltage setting circuit that is connected to said voltage regulator to adjust an output voltage of said voltage regulator;
- a switching element that is used to connect an output voltage setting terminal of said voltage regulator to a ground via a predetermined resistance;
- and
- a controller that controls an on/off state of said switching element, said controller switches said switching element to one of the on and off states so that the output voltage of said voltage regulator is reduced to a predetermined voltage which is lower than the preset power supply voltage.
Dependencies are inferred from the claim text.