Charging apparatus and charging current detecting circuit thereof
First Claim
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1. A charging apparatus comprising:
- a power supply for supplying a charging current to a secondary battery;
a detecting resistor disposed at a downstream side of the power supply for detecting the charging current; and
an operational amplifier for applying a voltage from the power supply, wherein the detecting resistor is disposed at a power voltage side of the downstream side of the power.
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Abstract
A charging apparatus and a charging current detecting circuit thereof are disclosed in which it is possible to implement an electric circuit with little voltage loss by using an operational amplifier of low cost. A detecting resistor is disposed at the power voltage side of the downstream side of a power supply. The charging apparatus further includes an auxiliary power means for generating an auxiliary voltage to supplement the voltage limited to the range of an input voltage of the operational amplifier.
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Citations
4 Claims
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1. A charging apparatus comprising:
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a power supply for supplying a charging current to a secondary battery;
a detecting resistor disposed at a downstream side of the power supply for detecting the charging current; and
an operational amplifier for applying a voltage from the power supply, wherein the detecting resistor is disposed at a power voltage side of the downstream side of the power. - View Dependent Claims (2)
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3. A charging current detecting circuit disposed in a charging apparatus having an operational amplifier for applying a voltage from a power supply, in which a charging current is supplied from the power supply to a secondary battery and, comprising:
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a detecting resistor for detecting the charging current, wherein the detecting resistor is disposed at a power voltage side of a downstream side of the power supply. - View Dependent Claims (4)
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Specification