Power source supply system
First Claim
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1. A power supply system for an electronic device comprising:
- an electric cell power source;
first voltage dropping means coupled to said electric cell power source for outputting a first dropped voltage by dropping an output voltage from said electric cell power source to half its value;
second voltage dropping means coupled to said first voltage dropping means for providing a second dropped voltage by dropping said first dropped voltage obtained from said first voltage dropping means to half its value; and
a logic circuit including an oscillation circuit to which said second dropped voltage is applied, and a watch circuit for providing a time display signal by frequency dividing an oscillation signal from said oscillation circuit.
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Abstract
A power source supply system uses an electric cell power source whose output voltage is 3 V, and drops the output voltage of 3 V to 1.5 V by a first voltage drop circuit and further drops the voltage of 1.5 V to 0.75 V to operate a logic circuit at the dropped voltage of 0.75 V.
7 Citations
18 Claims
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1. A power supply system for an electronic device comprising:
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an electric cell power source; first voltage dropping means coupled to said electric cell power source for outputting a first dropped voltage by dropping an output voltage from said electric cell power source to half its value; second voltage dropping means coupled to said first voltage dropping means for providing a second dropped voltage by dropping said first dropped voltage obtained from said first voltage dropping means to half its value; and a logic circuit including an oscillation circuit to which said second dropped voltage is applied, and a watch circuit for providing a time display signal by frequency dividing an oscillation signal from said oscillation circuit. - View Dependent Claims (2, 3, 4, 5, 6, 17, 18)
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7. A power source supply system for an electronic device comprising:
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an electric cell power source; voltage dropping means coupled to said electric cell power source for providing two dropped voltages of different potentials which are lower than the output voltage of said electric cell power source; a quartz oscillation circuit of the 4 MHz band which is coupled to said voltage dropping means to receive the lower of said two dropped voltages obtained by said voltage dropping means; time circuit means coupled to said oscillator circuit for providing time information by frequency dividing an oscillation signal from said quartz oscillation circuit; and a liquid crystal display device for being driven at said output voltage of said electric cell power source and/or said dropped voltages to display said time information obtained by said time circuit means. - View Dependent Claims (8, 9)
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10. A power source supply system for an electronic device comprising:
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an electric cell power source; first voltage dropping means coupled to said electric cell power source for outputting a first dropped voltage by dropping the output voltage of said electric cell power source to half of its value; second voltage dropping means coupled to said first voltage dropping means for providing a second dropped voltage by dropping said first dropped voltage obtained by said first voltage dropping means to half its value; a logic circuit having at least an oscillation circuit to which is supplied said second dropped voltage obtained by said second voltage dropping means; a heavy load circuit for being driven at said output voltage of said electric cell power source which reduces said output voltage of said electric cell power source when said heavy load circuit is driven; and voltage switching means responsive to when said heavy load circuit is driven for switching from said second dropped voltage supplied to said oscillation circuit when said heavy load circuit is driven to a voltage higher than said second dropped voltage. - View Dependent Claims (11, 12)
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13. A power source supply system for an electronic device comprising:
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an electric cell power source; voltage dropping means coupled to said electric cell power source for providing two dropped voltages of different potentials which are lower than the output voltage of said electric cell power source; a logic circuit having at least a quartz oscillation circuit which is coupled to receive the lower of said two dropped voltages obtained by said voltage dropping means; a heavy load circuit which is driven at said output voltage of said electric cell power source and which reduces said output voltage of said electric cell when said heavy load circuit is driven; and voltage switching means responsive to driving of said heavy load circuit for switching from the lower dropped voltage supplied to said oscillation circuit when said heavy load circuit is driven to the higher voltage obtained by said voltage dropping means. - View Dependent Claims (14, 15)
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16. A power supply system for an electronic device comprising:
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an electric cell power source; first voltage dropping means coupled to said electric power source for outputting a first dropped voltage by dropping an output voltage from said electric cell power source to half its value; second voltage dropping means coupled to said first voltage dropping means for providing a second dropped voltage by dropping said first dropped voltage obtained from said first voltage dropping means to half its value; and a logic circuit having an oscillation circuit which includes a quartz oscillator of the 4 MHz band to which said second dropped voltage is applied.
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Specification