Charging system and charging method, and power adapter
First Claim
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1. A power adapter, comprising:
- a first rectifier, configured to rectify a first alternating current and output a first voltage with a first ripple waveform;
a switch circuit, configured to modulate the first voltage according to a control signal and output a modulated first voltage;
a transformer, configured to output a plurality of voltages with ripple waveforms according to the modulated first voltage;
a compositing circuit, configured to composite the plurality of voltages to output a second alternating current, wherein, for each cycle of the second alternating current, a peak voltage of a positive half is greater than an absolute value of a valley voltage of a negative half;
a first charging interface, coupled to an output end of the compositing circuit, and configured to apply the second alternating current to a battery in a terminal via a second charging interface of the terminal when the first charging interface is coupled to the second charging interface, in which the second charging interface is coupled to the battery;
a sampling circuit, configured to sample voltage and/or current at a primary winding of the transformer to obtain a voltage sampling value and/or a current sampling value;
a control circuit, coupled to the sampling circuit and the switch circuit respectively, and configured to output the control signal to the switch circuit, and to adjust a duty ratio of the control signal according to the current sampling value and/or the voltage sampling value, such that the second alternating current meets a charging requirement of the terminal.
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Abstract
The present disclosure discloses a charging system, a charging method and a power adapter. The system includes a battery, a first rectifier, a switch unit, a transformer, a compositing unit, a sampling unit, and a control unit. The control unit outputs a control signal to the switch unit, and adjusts a duty ratio of the control signal according to a voltage sampling value and/or a current sampling value obtained by primary sampling of the sampling unit, such that a second alternating current outputted by the compositing unit meets a charging requirement. The second alternating current is applied to the battery.
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Citations
29 Claims
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1. A power adapter, comprising:
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a first rectifier, configured to rectify a first alternating current and output a first voltage with a first ripple waveform; a switch circuit, configured to modulate the first voltage according to a control signal and output a modulated first voltage; a transformer, configured to output a plurality of voltages with ripple waveforms according to the modulated first voltage; a compositing circuit, configured to composite the plurality of voltages to output a second alternating current, wherein, for each cycle of the second alternating current, a peak voltage of a positive half is greater than an absolute value of a valley voltage of a negative half; a first charging interface, coupled to an output end of the compositing circuit, and configured to apply the second alternating current to a battery in a terminal via a second charging interface of the terminal when the first charging interface is coupled to the second charging interface, in which the second charging interface is coupled to the battery; a sampling circuit, configured to sample voltage and/or current at a primary winding of the transformer to obtain a voltage sampling value and/or a current sampling value; a control circuit, coupled to the sampling circuit and the switch circuit respectively, and configured to output the control signal to the switch circuit, and to adjust a duty ratio of the control signal according to the current sampling value and/or the voltage sampling value, such that the second alternating current meets a charging requirement of the terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A charging system for a terminal, comprising:
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a power adapter, comprising; a first rectifier, configured to rectify a first alternating current and output a first voltage with a first ripple waveform; a switch circuit, configured to modulate the first voltage according to a control signal and output a modulated first voltage; a transformer, configured to output a plurality of voltages with ripple waveforms according to the modulated first voltage; a compositing circuit, configured to composite the plurality of voltages to output a second alternating current, wherein, for each cycle of the second alternating current, a peak voltage of a positive half is greater than an absolute value of a valley voltage of a negative half; a first charging interface, coupled to an output end of the compositing circuit; a sampling circuit, configured to sample voltage and/or current at a primary winding of the transformer to obtain a voltage sampling value and/or a current sampling value; and a control circuit, coupled to the sampling circuit and the switch circuit respectively, and configured to output the control signal to the switch circuit, to adjust a duty ratio of the control signal according to the current sampling value and/or the voltage sampling value, such that the second alternating current meets a charging requirement of the terminal; and the terminal, comprising a second charging interface and a battery, the second charging interface being coupled to the battery, wherein the second charging interface is configured to apply the second alternating current to the battery when the second charging interface is coupled to the first charging interface.
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29. A charging method for a terminal, comprising:
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when a first charging interface of a power adapter is coupled to a second charging interface of the terminal, performing a rectification on a first alternating current to output a first voltage with a first ripple waveform; modulating the first voltage by controlling a switch circuit, and outputting a plurality of voltages with ripple waveforms by a conversion of a transformer; compositing the plurality of voltages to output a second alternating current, wherein, for each cycle of the second alternating current, a peak voltage of a positive half is greater than an absolute value of a valley voltage of a negative half; applying the second alternating current to a battery of the terminal via the charging interface; sampling voltage and/or current at a primary winding of the transformer to obtain a voltage sampling value and/or a current sampling value; and adjusting a duty ratio of a control signal for controlling the switch circuit according to the voltage sampling value and/or the current sampling value, such that the second alternating voltage meets a charging requirement.
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Specification