BATTERY CHARGING APPARATUS
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Abstract
The battery charging apparatus is made with small and low-cost components. It includes a first transistor (T1) with a control input through which the charging current flows into a battery (B) and a current source (T3, T4, R1, R2) for a control current flowing to the control input of the first transistor. The current source sets or adjusts the control current so that the first transistor is non-conducting or blocked and the charging current flowing into the battery is shut off when a predetermined maximum charging voltage is reached at the battery.
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Citations
9 Claims
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1-5. -5. (canceled)
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6. An apparatus for charging a battery, said apparatus comprising:
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a first transistor (T1) with a control input, through which a charging current flows to a battery (B) connected to the first transistor when said battery (B) is being charged; a current source (T3, T4, R1, R2) for a control current for said transistor, said current source being connected to the control input of the first transistor (T1) to supply said control current; wherein said current source comprises means for adjusting or setting said control current, so that the first transistor is non-conducting or blocked and said charging current flowing into said battery is shut off when a predetermined maximum charging voltage at said battery is reached; and wherein the control input of the first transistor (T1) is connected to a Zener diode (ZD), said Zener diode (ZD) having a Zener voltage, which is exceeded when said predetermined maximum charging voltage at said battery is reached, so that a large portion of the control current supplied by the current source (T3, T4, R1, R2) flows away through the Zener diode (ZD) and the control current for the first transistor is so small, that the first transistor (T1) becomes non-conductive and interrupts the charging current to the battery. - View Dependent Claims (7, 8, 9)
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Specification