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Battery-charging-apparatus-and-method-with-charging-mode-convertible-function

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Battery charging apparatus and method with charging mode convertible function

Details

Inventors: Lee, Chang-Hum;
Assignee: SamSung Electronics Co., Ltd. (Suwon, KR)
Primary Examiner: Tso; Edward H.
Assistant Examiner:
Attorney, Agent or Firm: Bushnell, Esq.; Robert E.

A battery charging apparatus for use with batteries that require charging in a constant current mode and/or constant voltage mode. The charging apparatus includes a constant current charging control circuit converting the charging current supplied with the battery into a voltage signal and applying the voltage signal to a feedback input terminal of a switching regulator in response to a charging speed control signal F.sub.-- Q, and a constant voltage charging control circuit providing a control signal to the feedback input terminal for controlling constant voltage charging if the battery voltage level has reached a preset voltage level, whereby a constant voltage charging is possible during the charging operation in response to a charging mode selection signal CHG.sub.-- MOD. A microcomputer produces the charging mode selection signal CHG.sub.-- MOD when it is detected the charging voltage of the battery in the constant current mode and the detected voltage reached to a preset level in order to convert the charging mode into the constant voltage mode. Further, a charging speed control signal F.sub.-- Q is produced to enable the switching regulator to perform quick charging operation. With this arrangement, the constant voltage (CV) charging mode can be performed when the battery is in the preset condition, regardless of type of batteries. In addition, by provision of a protection circuit, possible damage of the CV charging control circuit due to the excessive static or surge is effectively prevented.

DETAILED DESCRIPTION It is therefore an object of the present invention to provide an improved mode convertible battery charging process and battery charger.
It is another object to provide a mode convertible battery charging process and charger able is to provide constant voltage charging when necessary during a constant current charging mode, irrespective of the type of battery being charged.
It is another object to provide a mode convertible battery charging process and battery charger able to protect the charging control circuits from being damaged by unexpected electrical shocks.
According to one aspect of the present invention, there is provided a battery charging process and a battery charger for use with batteries required to be charged in a constant current mode and/or constant voltage mode.
This uses a switching regulator generating a switching voltage from a DC voltage source; a constant current charging controller for detecting the current of the DC output provided by the switching regulator to produce a charging control signal for enabling the switching regulator to operate in the constant current mode; a battery detector for detecting the voltage level of the battery; a second controller for producing a charging mode selection signal, a charging speed control signal, and a charging enable signal in response to the voltage level detected from the battery detector; a charging speed controller for enabling the switching regulator to perform fast charging or quick charging operations in response to the input level of the charging speed control signal; a constant voltage charging controller for generating a control signal at the feedback input terminal of the switching regulator in order to operate the switching regulator in the constant voltage charging mode whenever the battery voltage level has reached a preset voltage level; a protection stage for preventing the constant voltage charging control circuit from being damaged by an excessive surge voltage; and a charging mode selector for enabling the constant voltage charging control circuit to operate in response to the charging mode selection signal

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