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Charging circuit and electronic device using the same

一种充电电路、充电电流的技术，应用在电池电路装置、二次电池充电/放电、电路等方向，能够解决设计性影响、充电电路不能工作、开口率下降等问题，达到高效充电的效果

Active Publication Date: 2012-07-11
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As a solar cell, when using a multi-cell solar cell in which multiple cells are superimposed, for example, a 0.5V×10-cell solar cell, when a part of it is covered, the output voltage drops accordingly, and there is concern about charging. circuit does not work
In addition, since it is necessary to wire at the boundary between cells, the aperture ratio is reduced, and designability is also affected

Method used

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  • Charging circuit and electronic device using the same
  • Charging circuit and electronic device using the same
  • Charging circuit and electronic device using the same

Examples

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Embodiment Construction

[0055] Hereinafter, the present invention will be described based on the best embodiments with reference to the drawings. The same or equivalent structural elements, components, and processes shown in the drawings are assigned the same symbols, and overlapping descriptions are appropriately omitted. In addition, the embodiment is only an illustration and does not limit the invention, and all the features described in the embodiment and combinations thereof are not necessarily essential contents of the present invention.

[0056] In this specification, the "state where part A is connected to part B" includes the case where part A and part B are physically directly connected, or the case where part A and part B are indirectly connected through other parts that do not affect the electrical connection state Condition.

[0057] Similarly, the "state where component C is placed between component A and component B" includes, in addition to the state in which component A and componen...

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Abstract

The present invention provides a charging circuit capable of efficiently charging a secondary battery. The charging circuit (100) receives the electric power from a solar cell (4) and charges the secondary battery (6). A charging current detection part (12) generates a detection signal (Vs) corresponding to a charging current (Iout) provided to the secondary battery (6) by a DC / DC converter (10). A control circuit (20) generates a reference voltage (Vref) corresponding to the detection signal (Vs). A drive part (30) generates a pulse signal (SPWM) with adjustable duty ratio to make the voltage (Vin) of the solar cell (4) consistent with a reference voltage (Vref ), and switches a switching transistor (M1) based on the pulse signal (SPWM). The control circuit (20) regulates the reference voltage (VREF), so that the charging current (Iout) is increased.

Description

technical field [0001] The present invention relates to a charging circuit for charging a secondary battery using electric power from a solar cell. Background technique [0002] In recent years, secondary batteries are mounted on electronic devices including mobile phones, PDAs (Personal Digital Assistants), and notebook personal computers. Charging of secondary batteries currently utilizes power from an adapter that converts commercial AC voltage into DC voltage or from a USB bus. In recent years, attempts have been made to mount solar cells in electronic equipment, and to charge secondary batteries using power from the solar cells. [0003] As a solar cell, when using a multi-cell solar cell in which multiple cells are superimposed, for example, a 0.5V×10-cell solar cell, when a part of it is covered, the output voltage drops accordingly, and there is concern about charging. Circuit doesn't work. In addition, since it is necessary to wire at the boundary between cells, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCY02E60/12H01M10/465H02J7/35H01M10/44Y02E10/566H02J7/045Y02E10/56Y02E60/10H02J7/04H02J7/00714H02J7/007182
Inventor 石野勉坂本忠之
Owner ROHM CO LTD
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