Battery charger
First Claim
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1. A battery charger comprising:
- an Alternating Current (AC) power supply;
a first rectifier smoothing circuit for rectifying and smoothing the AC voltage;
a switching circuit connected across output terminals of the first rectifier smoothing circuit to provide pulse signals;
a second rectifier smoothing circuit for rectifying and smoothing the pulse signals, an output voltage of the second rectifier smoothing circuit being applied to a battery to be charged;
a charging current control unit that detects a charging current flowing through the battery and controls the charging current in accordance with a charging current set value;
trigger means connected across the battery to be charged for generating a first trigger voltage based on a residual voltage of the battery when the battery is connected to the charger;
constant voltage generating means connected to the trigger means to receive the first trigger voltage and adapted to generate a constant voltage which is applied to the charging current control unit as an operating voltage thereof; and
a microcomputer that detects if the battery is connected to the charger and applies a control signal to the constant voltage generating means to stop supplying the operation voltage to the charging current control unit when the battery is detached from the battery charge.
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Abstract
A battery charger including a charging power supply circuit connected to an input power supply and adapted to charge a battery to be charged, a charging control circuit adapted to control charging of the battery, and a constant voltage power supply adapted to drive the charging control circuit, wherein the charging control circuit stops an output of the constant voltage power supply when the battery is detached from the charger.
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Citations
21 Claims
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1. A battery charger comprising:
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an Alternating Current (AC) power supply; a first rectifier smoothing circuit for rectifying and smoothing the AC voltage; a switching circuit connected across output terminals of the first rectifier smoothing circuit to provide pulse signals; a second rectifier smoothing circuit for rectifying and smoothing the pulse signals, an output voltage of the second rectifier smoothing circuit being applied to a battery to be charged; a charging current control unit that detects a charging current flowing through the battery and controls the charging current in accordance with a charging current set value; trigger means connected across the battery to be charged for generating a first trigger voltage based on a residual voltage of the battery when the battery is connected to the charger; constant voltage generating means connected to the trigger means to receive the first trigger voltage and adapted to generate a constant voltage which is applied to the charging current control unit as an operating voltage thereof; and a microcomputer that detects if the battery is connected to the charger and applies a control signal to the constant voltage generating means to stop supplying the operation voltage to the charging current control unit when the battery is detached from the battery charge. - View Dependent Claims (2, 3, 4, 5)
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6. A battery charger comprising:
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an Alternate Current (AC) power supply; charging power supply means connected to the input power supply and adapted to supply a voltage and a charging current to a battery; charging current control means electrically connected to the charging power supply means and adapted to control the charging current based on a set value; main control means adapted to supply the set value to the charging current control means; a circuit operation triggering means connected across the battery to be charged for generating a first trigger voltage based on a residual voltage of the battery when the battery is connected to the charger; and a constant voltage power supply connected to the circuit operation triggering means to receive the first trigger voltage and adapted to generate a constant voltage which is applied to the charging current control means and the main control means as an operating voltage thereof, wherein the main control means detects if the battery is connected to the charger and applies a control signal to the constant voltage power supply to stop supplying the operation voltage when the battery is detached from the battery charger. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification