Power circuit, power circuit control method and electronic device using the power circuit

A method for controlling a power circuit having a chemical cell used to store a predetermined amount of energy, to produce electromotive force based on said energy and to feed said electromotive force to a load, a capacitor which is charged by said electromotive force produced by said chemical cell and accumulates electric power and applies said accumulated electric power to said load and a control section, said method comprising:

• a step of applying, by using said control section, when a voltage of said capacitor is higher than a first reference value and a load current flowing through said load is smaller than a second reference value, a voltage produced by said chemical cell to said capacitor from said chemical cell to charge said capacitor, feeding, at a same time, said electromotive force produced by said chemical cell and said accumulated electric power in said capacitor to said load, feeding only said accumulated electric power in said capacitor to said load when said load current is larger than said second reference value and, applying, when a voltage of said capacitor is lower than said first reference value and when said load current flowing through said load is smaller than said second reference value, a current whose level is limited to a predetermined level to said capacitor from said chemical cell to charge said capacitor and feeding said electromotive force produced by said chemical cell to said load.

A method for controlling a power circuit having a chemical cell used to store a predetermined amount of energy, to produce electromotive force based on said energy and to feed said electromotive force to a load, a capacitor which is charged by said electromotive force produced by said chemical cell and accumulates electric power and applies said accumulated electric power to said load and a control section, said method comprising:

• a step of mounting a capacitor voltage detecting unit, a load current detecting unit, and an electric power feeding and charging unit to said control unit;
• a capacitor voltage detecting step of, by using said capacitor voltage detecting unit, detecting a voltage of said capacitor, comparing said detected voltage with said first reference value, outputting, when said voltage of said capacitor is lower than said first reference value, a first detection signal being in an active mode and outputting, when said voltage of said capacitor is higher than said first reference value, said first detection signal being in a non-active mode;
• a load current detecting step of, by using said load current detecting unit, detecting said load current flowing through said load, comparing said detected load current with said second reference value and outputting, when said load current is higher than said second reference value, a second detection signal being in an active mode and outputting, when said load current is smaller than said second reference value, said second detection signal being in a non-active mode.
• a first electric power feeding and charging step of, by using said electric power feeding and charging unit, feeding, when said first detection signal is in said non-active mode and said second detection signal is in said non-active mode, a voltage produced by said chemical cell from said chemical cell to said capacitor to charge said capacitor and feeding, at a same time, electromotive force produced by said chemical cell and electric power accumulated in said capacitor to said load;
• an electric power feeding processing step of, by using said electric power feeding and charging unit, feeding, when said second detection signal is in said active mode, only electric power accumulated in said capacitor to said capacitor;
• and
• a second electric power feeding and charging step of, by using said electric power feeding and charging unit, feeding, when said first detection signal is in said active mode and said second detection signal is in said non-active mode, a current whose level is limited to a predetermined level to said capacitor from said chemical cell to charge said capacitor and applying, at a same time, electromotive force produced by said chemical cell to said load.

An electronic device provided with a power circuit, said power circuit comprising:

• a chemical cell used to store a predetermined amount of energy, to produce electromotive force based on said energy and to feed said electromotive force to a load;
• a capacitor which is charged by said electromotive force produced by said chemical cell and accumulates electric power and applies said accumulated electric power to said load;
• a control section;
• and
• wherein said control section, when a voltage of said capacitor is higher than a first reference value and when a load current flowing through said load is smaller than a second reference value, applies a voltage produced by said chemical cell to said capacitor from said chemical cell to charge said capacitor and, at a same time, feeds said electromotive force produced by said chemical cell and said accumulated electric power in said capacitor to said load and, when said load current is larger than said second reference value, feeds only said electric power accumulated in said capacitor to said load and, when a voltage of said capacitor is lower than said first reference value and said load current flowing through said load is smaller than said second reference value, applies a current whose level is limited to a predetermined level to said capacitor from said chemical cell to charge said capacitor and feeds said electromotive force produced by said chemical cell to said load.

An electronic device provided with a power circuit having a chemical cell used to store a predetermined amount of energy, to produce electromotive force based on said energy and to feed said electromotive force to a load, a capacitor which is charged by said electromotive force produced by said chemical cell and accumulates electric power and applies said accumulated electric power to said load and a control section,

• said electronic device using a power circuit controlling method, said method comprising:
• a step of applying, by using said control section, when a voltage of said capacitor is higher than a first reference value and a load current flowing through said load is smaller than a second reference value, a voltage produced by said chemical cell to said capacitor from said chemical cell to charge said capacitor, feeding, at a same time, said electromotive force produced by said chemical cell and said accumulated electric power in said capacitor to said load, feeding only said accumulated electric power in said capacitor to said load when said load current is larger than said second reference value and, applying, when a voltage of said capacitor is lower than said first reference value and when said load current flowing through said load is smaller than said second reference value, a current whose level is limited to a predetermined level to said capacitor from said chemical cell to charge said capacitor and feeding said electromotive force produced by said chemical cell to said load.

An electronic device provided with a power circuit having a chemical cell used to store a predetermined amount of energy, to produce electromotive force based on said energy and to feed said electromotive force to a load, a capacitor which is charged by said electromotive force produced by said chemical cell and accumulates electric power and applies said accumulated electric power to said load and a control section,

• said electronic device using a power circuit controlling method, said method comprising:
• a step of mounting a capacitor voltage detecting unit, a load current detecting unit, and an electric power feeding and charging unit to said control unit;
• a capacitor voltage detecting step of, by using said capacitor voltage detecting unit, detecting a voltage of said capacitor, comparing said detected voltage with said first reference value, outputting, when said voltage of said capacitor is lower than said first reference value, a first detection signal being in an active mode and outputting, when said voltage of said capacitor is higher than said first reference value, said first detection signal being in a non-active mode;
• a load current detecting step of, by using said load current detecting unit, detecting said load current flowing through said load, comparing said detected load current with said second reference value and outputting, when said load current is higher than said second reference value, a second detection signal being in an active mode and outputting, when said load current is smaller than said second reference value, said second detection signal being in a non-active mode.
• a first electric power feeding and charging step of, by using said electric power feeding and charging unit, feeding, when said first detection signal is in said non-active mode and said second detection signal is in said non-active mode, a voltage produced by said chemical cell from said chemical cell to said capacitor to charge said capacitor and feeding, at a same time, electromotive force produced by said chemical cell and electric power accumulated in said capacitor to said load;
• an electric power feeding processing step of, by using said electric power feeding and charging unit, feeding, when said second detection signal is in said active mode, only electric power accumulated in said capacitor to said capacitor;
• and
• a second electric power feeding and charging step of, by using said electric power feeding and charging unit, feeding, when said first detection signal is in said active mode and said second detection signal is in said non-active mode, a current whose level is limited to a predetermined level to said capacitor from said chemical cell to charge said capacitor and applying, at a same time, electromotive force produced by said chemical cell to said load.