Electricity: battery or capacitor charging or discharging – Cell or battery charger structure – Charger inductively coupled to cell or battery
Patent
1997-11-14
1999-09-14
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Cell or battery charger structure
Charger inductively coupled to cell or battery
320115, 320DIG21, H02J 700
Patent
active
059528141
ABSTRACT:
Known is an induction charging apparatus for charging battery means in an electronic device when inductively coupled to the charging apparatus, the charging apparatus comprising a first casing having a charging receptacle for receiving the electronic device and an alternating current power source coupled to a primary coil provided in the first casing, and the electronic device comprising a second casing provided with a secondary coil electronically coupled to the battery means, whereby the primary and the secondary coil are magnetically coupled for inductively conveying energy from the primary coil to the secondary coil when the electronic device is put in the receptacle. So as to prevent heating metallic objects that might enter the receptacle when the phone is not being charged but used, the induction charging apparatus comprises electric power blocking means for blocking power to be conveyed from the alternating current power source to the primary coil when the electronic device is absent from the charging receptacle, and the electronic device comprising unblocking means for unblocking the power to be conveyed, whereby the blocking and unblocking means are paired. Herewith, a cheap and reliable means for preventing such undesired heating are provided.
REFERENCES:
patent: 5122729 (1992-06-01), Itoga et al.
patent: 5159256 (1992-10-01), Mattinger et al.
patent: 5734254 (1998-03-01), Stephens
Toatley Gregory J.
U.S. Philips Corporation
Wong Peter S.
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