Multi-purpose battery charging circuit
A battery charging and multi-purpose technology, applied in battery circuit devices, circuit devices, battery load switching, etc., can solve problems such as unguaranteed, current reduction, random ripple, etc.
Inactive Publication Date: 2012-01-11
ST ERICSSON SA
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Problems solved by technology
Therefore, any excess power in circuit 10 will cause V SYS small fluctuations
However, when charging is complete, the wall plug adapter 100 switches to a continuous top-up charging mode to keep the battery 20 fully charged with a continuous top-up charging rate low enough to avoid overcharging, which is no longer applicable.
In these cases, the current injected into the battery 20 is greatly reduced, and it cannot be guaranteed that the total amount of current flowing through the battery 20 and the circuit 10 exceeds the maximum current I output from the wall plug adapter 100. (CHG)MAX
It results in the wall plug adapter voltage V CHG (=V SYS ) grows again, and will be at V SYS A random ripple appears on the
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[0019] In the following, the first preferred embodiment will be described in conjunction with the integrated battery charging circuit of charging-playing mode, such as Figure 2a and 2b As shown, the charge-play mode allows the voltage V connected to the circuit SYS is regulated to a voltage close to V BAT voltage.
[0020] exist Figure 2a Among them, the integrated battery charging circuit of charging-playing mode according to the first preferred embodiment of the present invention is based on Figure 1a The circuit in , where the first switching device 200 (e.g., MOSFET, BJT or any other controllable semiconductor switching device) is now part of a voltage regulator 310 connected between terminals CHG and SYS, and tracks the Voltage V BAT and the voltage at terminal SYS V SYS . like Figure 2b As shown, the voltage regulator 310 converts the voltage at terminal SYS to V SYS Regulated for ratio V BAT slightly higher value. Thus, the voltage regulator 310 will track V...
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The present invention relates to a multi-purpose battery charging circuit configuration able to be selectively in a simple charge mode when intended for low-end solutions (option 3) or in a charge-and-play mode when intended for medium- and high-end solutions (options 1 and 2 respectively), while maintaining the supply voltage of any portable and mobile electronic devices with an acceptable noiselevel. The selection will be made possible by the use of multiplexers (MUXl, MUX2). If the option 1 is chosen, the bi-directional switching device (210) will be controlled by a driver circuit (340) for allowing the current which flows through it towards the battery (20) to strongly increase and thereby maintaining the voltage across the circuitry (10) at a value slightly greater than the voltage across the battery (20). If the option 2 is chosen, the synchronous step-down voltage regulator (310) comprising at least the driver circuit (350) and the switching devices (200, 230) will track the voltages across the circuitry (10) and the battery (20) for regulating the voltage across the circuitry (10) at a value in the vicinity of the voltage across the battery (20). If the option 3 is chosen, the battery (20) which cannot be separated from the circuitry (10) will be in a simple charge mode while being charged through the switching device (210).
Description
technical field [0001] The present invention relates to battery charging circuits, and is particularly concerned with multipurpose integrated battery charging circuits that can be selectively configured in a simple charging mode, or in a charging-playing mode, while maintaining any portable and mobile electronic The supply voltage of the device. Background technique [0002] Mobile devices such as cell phones, personal digital assistants (PDAs), portable personal computers, camcorders, digital cameras, or MP3 players, for example, need to be powered by a working rechargeable battery when no alternative power source is available. The circuit is powered. However, when the battery is completely discharged and therefore no longer functional, it can be recharged through a DC power source such as a wall plug adapter. Thus, two charging configuration modes are available: simple charge mode and charge-play mode, simple charge mode is usually used for low-end solutions, where the d...
Claims
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IPC IPC(8): H02J7/00
CPCH02J7/0068
Inventor 纪尧姆·德克勒穆
Owner ST ERICSSON SA