Battery Charging Circuit and Reference Signal Generator
First Claim
1. A battery charging circuit adjusting a charging voltage or a charging current according to a battery temperature, comprising:
- a power stage circuit including at least one power transistor switch and converting input power to charging power by operating the power transistor switch within a temperature range, wherein the charging power includes the charging voltage and the charging current;
a reference signal generator obtaining signals representing the battery temperature and generating a reference signal accordingly;
a feedback circuit generating a feedback signal according to the output voltage; and
a control circuit generating a switch signal according to the reference signal for operating the power transistor of the power stage circuit, wherein the charging voltage or the charging current is gradually increased as the battery temperature increases in a lower range within the temperature range or gradually decreased as the battery temperature increases in a higher range within the temperature range.
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Abstract
The present invention discloses a battery charging circuit adjusting a charging voltage or a charging current according to a battery temperature, which includes: a power stage circuit including at least one power transistor switch and converting input power to charging power by operating the power transistor switch within a temperature range, wherein the charging power includes the charging voltage and the charging current; a reference signal generator obtaining signals representing the battery temperature and generating a reference signal accordingly; and a control circuit generating a switch signal according to the reference signal for operating the power transistor of the power stage circuit, wherein the charging voltage or the charging current is gradually increased as the battery temperature increases in a lower range within the temperature range or gradually decreased as the battery temperature increases in a higher range within the temperature range.
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Citations
13 Claims
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1. A battery charging circuit adjusting a charging voltage or a charging current according to a battery temperature, comprising:
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a power stage circuit including at least one power transistor switch and converting input power to charging power by operating the power transistor switch within a temperature range, wherein the charging power includes the charging voltage and the charging current; a reference signal generator obtaining signals representing the battery temperature and generating a reference signal accordingly; a feedback circuit generating a feedback signal according to the output voltage; and a control circuit generating a switch signal according to the reference signal for operating the power transistor of the power stage circuit, wherein the charging voltage or the charging current is gradually increased as the battery temperature increases in a lower range within the temperature range or gradually decreased as the battery temperature increases in a higher range within the temperature range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A reference signal generator generating a reference signal according to a battery temperature, comprising:
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a current source generating a main current signal; an adjustment circuit generating a current adjustment signal when the battery temperature is in a lower range or a higher range of a temperature range, wherein the reference signal is the main current signal subtracted by the current adjustment signal or a signal converted from the difference between the main current signal and the current adjustment signal, and wherein the current adjustment signal is gradually decreased as the battery temperature increases in the lower range of the temperature range or gradually increased as the battery temperature increases in the higher range of the temperature range; and an over temperature range cutoff circuit controlling the reference signal to be at zero level when the battery temperature is out of the temperature range. - View Dependent Claims (11, 12, 13)
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Specification