Charger system switchably connects a smoothing capacitor and resistor and charging controller based on a detected secondary battery voltage
First Claim
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1. A charger system for charging a secondary battery with an AC voltage, comprising:
- a rectifier diode for rectifying said AC voltage into a DC voltage;
a smoothing capacitor having high impedance as compared with an impedance of said secondary battery, for smoothing said DC voltage outputted from said rectifier diode;
charging control means for receiving said smoothed DC voltage from said smoothing capacitor and supplying a predetermined constant voltage to said secondary battery;
first switch means connected in parallel with said charging control means;
detector means for detecting a terminal voltage of said secondary battery;
switch control means for supplying a control signal to control an opening/closing state of said first switch means in accordance with a detection result of said detector means, for switching said first switch means to a closing state to supply said smoothed DC voltage to said secondary battery through said first switch means when said detected terminal voltage is lower than a predetermined charging standard voltage, and for switching said first switch means to an opening state to supply said DC voltage to said secondary battery through said charging control means when said detected terminal voltage reaches the predetermined charging standard voltage;
second switch means connected in series between said smoothing capacitor and a ground potential; and
a resistor element connected in parallel with said second switch means,wherein said smoothing capacitor has one end connected to an output end of said rectifier diode and the other end connected to said ground potential, and said second switch means is controlled in accordance with said control signal to connect said smoothing capacitor to said ground potential via said resistor element when said detected terminal voltage is lower than the predetermined charging standard voltage and to connect said smoothing capacitor to said ground potential without connecting through said resistor element when said detected terminal voltage reaches the charging standard voltage.
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Abstract
A battery charging system detects a secondary battery terminal voltage and selectively controls a first switch to connect/disconnect a series-connected smoothing capacitor and resistor to ground to present an impedance greater than the battery impedance and further controls a second switch to connect/disconnect a charging control circuit in series between the voltage supply and the secondary battery being charged.
28 Citations
8 Claims
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1. A charger system for charging a secondary battery with an AC voltage, comprising:
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a rectifier diode for rectifying said AC voltage into a DC voltage; a smoothing capacitor having high impedance as compared with an impedance of said secondary battery, for smoothing said DC voltage outputted from said rectifier diode; charging control means for receiving said smoothed DC voltage from said smoothing capacitor and supplying a predetermined constant voltage to said secondary battery; first switch means connected in parallel with said charging control means; detector means for detecting a terminal voltage of said secondary battery; switch control means for supplying a control signal to control an opening/closing state of said first switch means in accordance with a detection result of said detector means, for switching said first switch means to a closing state to supply said smoothed DC voltage to said secondary battery through said first switch means when said detected terminal voltage is lower than a predetermined charging standard voltage, and for switching said first switch means to an opening state to supply said DC voltage to said secondary battery through said charging control means when said detected terminal voltage reaches the predetermined charging standard voltage; second switch means connected in series between said smoothing capacitor and a ground potential; and a resistor element connected in parallel with said second switch means, wherein said smoothing capacitor has one end connected to an output end of said rectifier diode and the other end connected to said ground potential, and said second switch means is controlled in accordance with said control signal to connect said smoothing capacitor to said ground potential via said resistor element when said detected terminal voltage is lower than the predetermined charging standard voltage and to connect said smoothing capacitor to said ground potential without connecting through said resistor element when said detected terminal voltage reaches the charging standard voltage. - View Dependent Claims (2)
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3. charger system for charging a secondary battery with an AC voltage, comprising:
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a rectifier diode for rectifying said AC voltage into a DC voltage; a smoothing capacitor having high impedance as compared with an impedance of said secondary battery, for smoothing said DC voltage outputted from said rectifier diode; charging control means for receiving said smoothed DC voltage from said smoothing capacitor and supplying a predetermined constant voltage to said secondary battery; first switch means connected in parallel with said charging control means; detector means for detecting a terminal voltage of said secondary battery; switch control means for supplying a control signal to control an opening/closing state of said first switch means in accordance with a detection result of said detector means, for switching said switch means to a closing state to supply said smoothed DC voltage to said secondary battery through said first switch means when said detected terminal voltage is lower than a predetermined charging standard voltage, and for switching said first switch means to an opening state to supply said DC voltage to said secondary battery through said charging control means when said detected terminal voltage reaches the predetermined charging standard voltage;
whereinsaid smoothing capacitor has one end connected to an output end of said rectifier diode and said charger system further comprises second switch means having one connecting end connected to a ground potential, and said switch control means controls said second switch means in accordance with said control signal to disconnect said smoothing capacitor from said ground potential when said detected terminal voltage is lower than the predetermined charging standard voltage and to connect said smoothing capacitor to said ground potential when said detected terminal voltage reaches the predetermined charging standard voltage.
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4. A charging method for charging a secondary battery with an AC voltage, comprising the steps of:
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rectifying said AC voltage into a DC voltage with a diode; smoothing said DC voltage with a smoothing capacitor having high impedance as compared with an impedance of said secondary battery; detecting a terminal voltage of said secondary battery; supplying said smoothed DC voltage to said secondary battery when said detected terminal voltage is lower than a predetermined charging standard voltage; and supplying said DC voltage to said secondary battery while maintaining said DC voltage at a constant voltage when said detected terminal voltage reaches the predetermined charging standard voltage; disconnecting said smoothing capacitor from a ground potential when said detected terminal voltage is lower than the predetermined charging standard voltage; and connecting said smoothing capacitor to said ground potential when said detected terminal voltage reaches the predetermined charging standard voltage.
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5. A secondary battery system for charging a secondary battery with an AC voltage, comprising:
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a rectifier diode for rectifying said AC voltage into a DC voltage; a smoothing capacitor having high impedance as compared with an impedance of said secondary battery, for smoothing said DC voltage outputted from said rectifier diode; charging control means for receiving said smoothed DC voltage from said smoothing capacitor and supplying a predetermined constant voltage to said secondary battery; first switch means connected in parallel with said charging control means; detector means for detecting a terminal voltage of said secondary battery; and switch control means for supplying a control signal in accordance with a detection result of said detector means to control an opening/closing state of said first switch means, for switching said first switch means to a closing state to supply said smoothed DC voltage to said secondary battery through said first switch means when said detected terminal voltage is lower than a predetermined charging standard voltage and for switching said first switch means to an opening state to supply said DC voltage to said secondary battery through said charging control means when said detected terminal voltage reaches the predetermined charging standard voltage; second switch means connected in series between said smoothing capacitor and a ground potential; and a resistor element connected in parallel with said second switch means, wherein said smoothing capacitor has one end connected to an output end of said rectifier diode and the other end connected to said ground potential, and said second switch means is controlled in accordance with said control signal to connect said smoothing capacitor to said ground potential via said resistor element when said detected terminal voltage is lower than the predetermined charging standard voltage and to connect said smoothing capacitor to said ground potential without connecting through said resistor element when said terminal voltage reaches the predetermined charging standard voltage. - View Dependent Claims (6, 7)
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8. A secondary battery system for charging a secondary battery with an AC voltage, comprising:
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a rectifier diode for rectifying said AC voltage into a DC voltage; a smoothing capacitor having high impedance as compared with an impedance of said secondary battery, for smoothing said DC voltage outputted from said rectifier diode; charging control means for receiving said smoothed DC voltage from said smoothing capacitor and supplying a predetermined constant voltage to said secondary battery; first switch means connected in parallel with said charging control means; detector means for detecting a terminal voltage of said secondary battery; and switch control means for supplying a control signal in accordance with a detection result of said detector means to control an opening/closing state of said first switch means, for switching said first switch means to a closing state to supply said smoothed DC voltage to said secondary battery through said first switch means when said detected terminal voltage is lower than a predetermined charging standard voltage and for switching said first switch means to an opening state to supply said DC voltage to said secondary battery through said charging control means when said detected terminal voltage reaches the predetermined charging standard voltage;
whereinsaid smoothing capacitor has one end connected to an output end of said rectifier diode and said secondary battery system further comprises second switch means having one connecting end connected to a ground potential, and said second switch means is controlled in accordance with said control signal to disconnect said smoothing capacitor from said ground potential when said detected terminal voltage is lower than the predetermined charging standard voltage and to connect said smoothing capacitor to said ground potential when said detected terminal voltage reaches the predetermined charging standard voltage.
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Specification