CURRENT TO FREQUENCY CONVERSION, APPARATUS AND METHODS
First Claim
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1. An apparatus comprising:
- a sensing element through which a battery operatively charges and discharges;
a current-to-current converter coupled to the sensing element to generate a first current and to generate a second current, the two currents correlated to current through the sensing element such that the first current is zero relative to a bias current when the second current is non-zero relative to the bias current and the second current is zero relative to the bias current when the first current is non-zero relative to the bias current; and
a capacitor coupled to the current-to-current converter, the current-to-current converter to operatively deliver a difference current at a node of the capacitor, the difference current being the difference between the first current and the second current.
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Abstract
Electronic apparatus, methods of forming the electronic apparatus, and methods of operating the electronic apparatus include features of current to frequency conversion that may be implemented in a variety of applications. Additional apparatus, systems, and methods are disclosed.
17 Citations
24 Claims
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1. An apparatus comprising:
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a sensing element through which a battery operatively charges and discharges; a current-to-current converter coupled to the sensing element to generate a first current and to generate a second current, the two currents correlated to current through the sensing element such that the first current is zero relative to a bias current when the second current is non-zero relative to the bias current and the second current is zero relative to the bias current when the first current is non-zero relative to the bias current; and a capacitor coupled to the current-to-current converter, the current-to-current converter to operatively deliver a difference current at a node of the capacitor, the difference current being the difference between the first current and the second current. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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generating a first current and a second current correlated to currents through a sensing element through which a battery operatively charges and discharges, the first and two currents related to each other such that the first current is zero relative to a bias current when the second current is non-zero relative to the bias current and the second current is zero relative to the bias current when the first current is non-zero relative to the bias current; and providing a difference current at a node of a capacitor, the difference current being the difference between the first current and the second current. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method comprising:
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providing a sensing element having a node to couple to a battery such that the battery operatively charges and discharges through the sensing element; coupling a current-to-current converter to the sensing element, the current-to-current converter arranged to generate a first current and a second current correlated to current through the sensing element, the current-to-current converter arranged such that the first current is zero relative to a bias current when the second current is non-zero relative to the bias current and the second current is zero relative to the bias current when the first current is non-zero relative to the bias current; and coupling a capacitor to the current-to-current converter such that the capacitor operatively receives a difference current at a node of the capacitor, the difference current being the difference between the first and second currents. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A system comprising:
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a battery; an application section having a power switching unit to operatively connect the battery to a charging source; and a battery gauging unit coupled between the battery and the application section, the battery gauging unit including; a sensing element through which the battery operatively charges and discharges; a current-to-current converter coupled to the sensing element to generate a first current and to generate a second current, the two currents correlated to current through the sensing element such that the first current is zero relative to a bias current when the second current is non-zero relative to the bias current and the second current is zero relative to the bias current when the first current is non-zero relative to the bias current; and a capacitor coupled to the current-to-current converter, the current-to-current converter to operatively deliver a difference current at a node of the capacitor, the difference current being the difference between the first current and the second current. - View Dependent Claims (21, 22, 23, 24)
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Specification