Title:
QUICK CHARGING CIRCUIT OF BATTERY
Document Type and Number:
Japanese Patent JPH09312940
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a charging circuit for a portable electronic apparatus, particularly for a wireless telephone and a cell-type telephone, whose charging end can be most properly detected even if a power is supplied from a battery while the battery is re-charged. SOLUTION: The estimated value D(n) of the 1st differential of a battery voltage V(n) which is sampled at a timing (n) (step 13) is calculated by a formula: D(n)= V(n)-V(n-16)}+ V(n-1)-V(n-17)}+ V(n-2)-V(n-18)}+... + V(n-15)-V(n-31)} (step 14). The values V(i) are stored in a memory beforehand. A determination parameter P(n) is calculated by a formula: P(n) =λD(n-1)+(1-λ)D(n) wherein λ=0.5-1 (step 15). If P(n) is negative (step 17), the charging of a battery is discontinued (step 18).
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Inventors:
JIYANNRIYUKU BOTO
SEDORIKU SHIRUBUESUTOURU
SEDORIKU SHIRUBUESUTOURU
Application Number:
JP2808297A
Publication Date:
December 02, 1997
Filing Date:
February 12, 1997
Export Citation:
Assignee:
PHILIPS ELECTRONICS NV
International Classes:
H02J7/10; H02J7/00; (IPC1-7): H02J7/10
Attorney, Agent or Firm:
伊東 忠彦 （外１名）