Power supply device with voltage dropping means
AssigneeCasio Computer Co., Ltd.
InventorNobuo Tamaki
Life of this patent
Estimating the term…
Abstract
A power supply system for an electronic device having a battery power source, a logic circuit, a voltage dropping circuit which drops the voltage of the battery power source to produce a dropped voltage, and a load circuit to drop the output voltage of the battery power source comprises a voltage switch circuit for supplying selectively the output voltage from the power source and the dropped voltage from the voltage dropping circuit to the logic circuit as a drive voltage. In the system, the logic circuit is usually operated by the output voltage from the dropping voltage circuit. When the load circuit operates, it is operated by the output voltage from the battery power source.
Claims16
A power supply device with voltage dropping means comprising:
- a battery power source;
- voltage drop circuit means coupled to said battery power source for dropping the output voltage of said battery power source to obtain a dropped output voltage;
- logic circuit means to which said dropped output voltage of said voltage drop circuit means is supplied as a drive power source;
- load circuit means which, when operated, applies a load on said battery power source which causes a drop of the output voltage of said battery power source;
- and
- voltage switching circuit means responsive to operation of said load circuit means for switchingly supplying the output voltage of said battery power source, as a drive voltage, to said logic circuit means in place of the dropped output voltage from said voltage drop circuit means when said load circuit means is operated.
A power supply device with voltage dropping means, comprising:
- a battery power source;
- a logic circuit means coupled to said battery power source adapted to start its operation upon receipt of the output voltage of said battery power source and including means for generating a clock pulse signal of a predetermined cycle;
- voltage drop circuit means coupled to said logic circuit means for dropping the output voltage of said battery power source by said clock pulse signal of a predetermined cycle generated by said logic circuit means and for producing a dropped voltage lower than the output voltage of said battery power source;
- and
- voltage switching circuit means for supplying the dropped voltage produced from said said voltage drop circuit means to said logic circuit means in place of the output voltage of said battery power source.
A power supply device with voltage dropping means comprising:
- a battery power source;
- logic circuit means coupled to said battery power source and including at least means for generating a clock signal of a predetermined cycle;
- voltage drop circuit means coupled to said logic circuit means for causing a voltage drop to occur by said clock signal from said logic circuit means and for supplying the dropped voltage lower than output voltage of said battery power source, as a drive voltage, to said logic circuit means;
- load circuit means which, when operated, applies a load on said battery power source which is sufficiently large as to cause a drop of the output voltage of said battery power source;
- and
- voltage switching circuit means responsive to operation of said load circuit means for switchingly supplying the output voltage of said battery power source, as a drive voltage, to said logic circuit means in place of the dropped voltage of said voltage drop circuit means, when said load circuit means is operated.
A power supply device with voltage dropped means comprising:
- a battery power source;
- voltage drop circuit means coupled to said battery power source for dropping the output voltage of said battery power source in response to a clock signal of a predetermined cycle and for generating a dropped voltage lower than the output voltage of said battery power source;
- logic circuit means at least including means for generating said clock signal of a predetermined cycle which is supplied to said voltage drop circuit means;
- external operation switch means provided to start an operation of said logic circuit means;
- and
- voltage switching circuit means coupled at least to said external operation switch means for supplying the output voltage of said battery power source to said logic circuit means responsive to the operation of said external operation switch means to cause said logic circuit means to produce a clock signal of a predetermined cycle and said voltage drop circuit means to produce said dropped voltage and for supplying said dropped voltage to said logic circuit in place of the output voltage of said battery power source after the operation of said external operation switch means is completed.
Dependencies are inferred from the claim text.