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Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
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The traditional lithium-ion battery charger circuit needs very
long time to charge batteries.
This invention can reduce battery charging time by changing the constant
voltage charge process.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
72% of the total text.
Page 1 of 3
Battery Charger Circuit which improved charge time
Disclosed is a circuit for cutting short time of battery charging. The process of traditional circuit consists of two ways, "constant current charge" and "constant voltage charge". The "constant voltage charge" process takes a long time (fig. 1). This invention can work out by controling the configuration that is MAX voltage to charge a battery (fig. 2).
4.2V + ⊿V
The following example is a case of using 4.2V lithium-ion battery. (fig.3 - fig 5)
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Page 2 of 3
VBAT = 4.2[V]
OFFI = 0
V'BAT = 4.2[V] - ⊿V
VB= 4.2[V] - ⊿V
Charge the battery by traditional charging (fig. 3)
Switch "Q" becomes OFF and the current "I" becomes zero. Then the IC detects " V = 4.2[V] - V'BAT "（fig.4）
The IC sets the configuration of charging voltage "VBAT = 4.2[V] + V", which means the switch "Q" will become OFF by 4.2[V] + V
Switch "Q" becomes ON and this circuit starts to charge the battery again
The IC detects "VBAT = 4.2[V] + V", and the swithc "Q" becomes OFF
VBAT = 4.2[V] + ⊿V
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Page 3 of 3
VBAT = V + VB <=> 4.2[V] + V = V + VB
<=> VB = 4.2[V] （fig.5）
Use or discarge the battery
Return to Step.1 when the IC detects the VBAT as the minimam voltage