Accumulator
First Claim
1. An electric storage device comprising:
- an electricity storing section for storing electric power;
an electric current sensing section for sensing an electric current flowing through the electricity storing section;
a DC blocking capacitor coupled to a positive electrode of the electricity storing section;
a resistor coupled in series with the DC blocking capacitor and coupled to a negative electrode of the electricity storing section;
an ON/OFF circuit coupled in parallel with the resistor such that first and second terminals of the ON/OFF circuit are connected to respective first and second terminals of the resistor;
a peak voltage holding circuit;
a peak current holding circuit coupled to the electric current sensing section; and
a controller for controlling the peak voltage holding circuit, the peak current holding circuit, and the electric current sensing section,wherein the ON/OFF circuit is controlled, based on a condition where a direction of an electric current flowing from the positive electrode to the negative electrode of the electricity storing section is a positive direction, such that the ON/OFF circuit is turned on when the electric current flows in a negative direction or a voltage at a junction point between the DC blocking capacitor and the resistor is negative, and such that the ON/OFF circuit is turned off when the electric current flows in the positive direction or a voltage at the junction point between the DC blocking capacitor and the resistor is positive, andwherein an internal resistor of the electricity storing section is found based on a peak voltage resulting from the control and held by the peak voltage holding circuit as well as a peak current resulting from the control and held by the peak current holding circuit.
1 Assignment
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Accused Products
Abstract
A DC blocking capacitor and a resistor are coupled in series, and coupled in parallel with an electricity storing section. An ON/OFF circuit and a peak voltage holding circuit are coupled in parallel with the resistor. A current sensing section is coupled in series with the storing section, with its output supplied to the peak current holding circuit. Current from a positive to a negative electrode of the storing section is referred to as a positive direction. The ON/OFF circuit is turned on when the current flows in a negative direction, and is turned off when the current flows in the positive direction. An internal resistor of the storing section is found based on a peak voltage and a peak current resulting from the control and held by the respective circuits. A degree of degradation of the electricity storing section is determined with this internal resistor.
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Citations
8 Claims
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1. An electric storage device comprising:
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an electricity storing section for storing electric power; an electric current sensing section for sensing an electric current flowing through the electricity storing section; a DC blocking capacitor coupled to a positive electrode of the electricity storing section; a resistor coupled in series with the DC blocking capacitor and coupled to a negative electrode of the electricity storing section; an ON/OFF circuit coupled in parallel with the resistor such that first and second terminals of the ON/OFF circuit are connected to respective first and second terminals of the resistor; a peak voltage holding circuit; a peak current holding circuit coupled to the electric current sensing section; and a controller for controlling the peak voltage holding circuit, the peak current holding circuit, and the electric current sensing section, wherein the ON/OFF circuit is controlled, based on a condition where a direction of an electric current flowing from the positive electrode to the negative electrode of the electricity storing section is a positive direction, such that the ON/OFF circuit is turned on when the electric current flows in a negative direction or a voltage at a junction point between the DC blocking capacitor and the resistor is negative, and such that the ON/OFF circuit is turned off when the electric current flows in the positive direction or a voltage at the junction point between the DC blocking capacitor and the resistor is positive, and wherein an internal resistor of the electricity storing section is found based on a peak voltage resulting from the control and held by the peak voltage holding circuit as well as a peak current resulting from the control and held by the peak current holding circuit. - View Dependent Claims (2, 5, 6)
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3. An electric storage device comprising:
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an electricity storing section for storing electric power; an electric current sensing section for sensing an electric current flowing through the electricity storing section; a DC blocking capacitor coupled to a positive electrode of the electricity storing section; a resistor coupled in series with the DC blocking capacitor and coupled to a negative electrode of the electricity storing section; an ON/OFF circuit coupled in parallel with the resistor such that first and second terminals of the ON/OFF circuit are connected to respective first and second terminals of the resistor; a bottom voltage holding circuit; a bottom current holding circuit coupled to the electric current sensing section; and a controller for controlling the bottom voltage holding circuit, the bottom current holding circuit, and the electric current sensing section, wherein the ON/OFF circuit is controlled, based on a condition where a direction of an electric current flowing from the positive electrode to the negative electrode of the electricity storing section is a positive direction, such that the ON/OFF circuit is turned on when the electric current flows in the positive direction or a voltage at a junction point between the DC blocking capacitor and the resistor is positive, and such that the ON/OFF circuit is turned off when the electric current flows in a negative direction or a voltage at the junction point between the DC blocking capacitor and the resistor is negative, and wherein an internal resistor of the electricity storing section is found based on a bottom voltage resulting from the control and held by the bottom voltage holding circuit as well as a bottom current resulting from the control and held by the bottom current holding circuit. - View Dependent Claims (4, 7, 8)
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Specification