Battery charger including correction device to correct control signals for supply switching circuit
First Claim
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1. A battery charger, comprising:
- an input supply terminal configured to receive a supply signal,a battery terminal configured to be connected to a battery,a supply switching circuit arranged in an electrical path between the battery terminal and the input supply terminal,a fuel gauge device configured to provide a digital estimation of a voltage signal across the battery,a control device configured to generate a control signal to control operation of the supply switching circuit, in response to a difference between the digital estimation of the voltage signal across the battery and a reference signal, anda correction device configured to modify said control signal generated by the control device if said digital estimation of the voltage signal across the battery is out of a value range between a first threshold and a second threshold by modifying the reference signal, wherein the first threshold is lower than the second threshold.
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Abstract
A battery charger includes an input supply terminal configured to receive a supply signal and a battery terminal configured to be connected to a battery. A supply switching circuit is arranged between the battery terminal and the input supply terminal. A control device generates a control signal to control operation of the supply switching circuit. A fuel gauge device provide a digital estimation of a voltage signal across the battery. A correction device modifies the control signal in response to the digital estimation of the voltage signal across the battery if that digital estimation is outside of a value range between two thresholds.
7 Citations
10 Claims
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1. A battery charger, comprising:
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an input supply terminal configured to receive a supply signal, a battery terminal configured to be connected to a battery, a supply switching circuit arranged in an electrical path between the battery terminal and the input supply terminal, a fuel gauge device configured to provide a digital estimation of a voltage signal across the battery, a control device configured to generate a control signal to control operation of the supply switching circuit, in response to a difference between the digital estimation of the voltage signal across the battery and a reference signal, and a correction device configured to modify said control signal generated by the control device if said digital estimation of the voltage signal across the battery is out of a value range between a first threshold and a second threshold by modifying the reference signal, wherein the first threshold is lower than the second threshold. - View Dependent Claims (2, 3, 4, 5)
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6. A method of operating a battery charger, wherein the battery charger includes an input supply terminal configured to receive a supply signal, a battery terminal configured to be connected to a battery, and a supply switching circuit arranged in an electrical path between the battery terminal and the input supply terminal, the method comprising:
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controlling said supply switching circuit, generating a digital estimation of a voltage signal across the battery, wherein the controlling is effectuated in response to a difference between the digital estimation of the voltage signal across the battery and a reference signal, modifying the controlling of the supply switching circuit if said digital estimation of the voltage signal across the battery which is outside of a value range between a first threshold and a second threshold by modifying the reference signal, wherein the first threshold is lower than the second threshold. - View Dependent Claims (7, 8)
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9. An integrated circuit, comprising:
circuitry formed in one chip of semiconductor material including; an input supply terminal configured to receive a supply signal, a battery terminal configured to be connected to a battery, a supply switching circuit arranged in an electrical path between the battery terminal and the input supply terminal, a control device configured to generate a control signal to control operation of the supply switching circuit, a fuel gauge device configured to provide a digital estimation of a voltage signal across the battery, wherein the control device generates the control signal in response to a difference between the digital estimation of the voltage signal across the battery and a reference signal, and a correction device configured to modify said control signal generated by the control device if said digital estimation of the voltage signal across the battery is out of a value range between a first threshold and a second threshold by modifying the reference signal, wherein the first threshold is lower than the second threshold.
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10. A battery charger, comprising:
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an input supply terminal configured to receive a supply signal, a battery terminal configured to be connected to a battery, a supply switching circuit arranged in an electrical path between the battery terminal and the input supply terminal, a fuel gauge device configured to provide a digital estimation of a voltage signal across the battery, a control device configured to generate a control signal to control operation of the supply switching circuit, a correction device configured to modify said control signal generated by the control device if said digital estimation of the voltage signal across the battery is out of a value range between a first threshold and a second threshold, wherein the first threshold is lower than the second threshold, and an enabling circuit of the correction device configured to enable the correction device only when a charging phase of the battery is operating at a constant voltage phase, wherein the enabling circuit comprises a comparison circuit configured to compare the voltage across the battery with a programmed floating voltage level of the battery, and to emit a signal at an active logic state when the voltage across the battery is close to the programmed floating voltage level of the battery.
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Specification