CHARGING MODE CONTROL CIRCUIT AND METHOD
First Claim
1. A charging mode control method for charging a secondary battery fixed in a portable device at the same time of data communication with an external communication device, the method comprising the steps of:
- filtering a charging voltage and obtaining a ripple voltage from the charging voltage;
comparing the ripple voltage with a reference voltage, thereby producing a voltage waveform signal according to a comparison result;
integrating the voltage waveform signal and thereby producing a charging control signal; and
selecting a charging mode for the secondary battery according to the charging control signal.
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Abstract
The present invention provides a charging mode control circuit and method. By utilizing such charging mode control circuit and method, a secondary battery fixed in a portable device can be quickly charged when the portable device communicate with an external computer. The method includes the steps of: a) providing a commutator, the commutator comprising an adaptor, a first interface, and a second interface, wherein the first interface is connected to the external computer and the second interface is connected to the portable device; b) filtering a charging voltage from the adaptor and obtaining a ripple voltage from the charging power supply; c) rectifying the ripple voltage; d) comparing the rectified ripple voltage with a reference voltage, thereby producing a voltage waveform signal according to a comparison result; and e) selecting a fast charging mode for the secondary battery according to the voltage waveform signal.
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Citations
17 Claims
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1. A charging mode control method for charging a secondary battery fixed in a portable device at the same time of data communication with an external communication device, the method comprising the steps of:
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filtering a charging voltage and obtaining a ripple voltage from the charging voltage;
comparing the ripple voltage with a reference voltage, thereby producing a voltage waveform signal according to a comparison result;
integrating the voltage waveform signal and thereby producing a charging control signal; and
selecting a charging mode for the secondary battery according to the charging control signal. - View Dependent Claims (2, 3, 4)
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5. A charging mode control circuit for selecting a charging mode for a secondary battery, the charging mode control circuit comprising:
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a filtering circuit for filtering a charging voltage and obtaining a ripple voltage from the charging voltage;
a comparing circuit for comparing an amplitude of the ripple voltage with an amplitude of a reference voltage generated from a reference voltage generator, and outputting a voltage waveform signal according to a comparison result;
an integral circuit for integrating the voltage waveform signal and outputting a voltage control signal; and
a charging control circuit for selecting a corresponding charging mode for the secondary battery according to the voltage control signal from the integral circuit. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A commutator for connecting a portable device and an external communication device, by which a secondary battery fixed in the portable device is charged at the same time of communicating with the computer, the commutator comprising:
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an adapter for obtaining a charging voltage from a mains supply, the adapter having a VCC line and a GND line;
a first interface for connecting an external computer and obtaining data from the external computer, the first interface having a VCC pin, a GND pin, and a plurality of DATA pins; and
a second interface for connecting the adapter and the portable device, the second interface having a VCC pin, a GND pin, and a plurality of DATA pins;
wherein;
the GND pin and the DATA pins of the second interface are respectively connected to the GND pin and the DATA pins of the first interface, and the GND pin and the VCC pin of the second interface further are respectively connected to the GND line and the VCC line of the adapter. - View Dependent Claims (16, 17)
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Specification