Protecting circuit of a charger without spark

Details Protecting circuit of a charger without spark Protecting circuit of a charger without spark

1999-06-14

2001-02-13

Leja, Ronald W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

C307S086000, C320S112000, C320S165000

Reexamination Certificate

active

06188554

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a protecting circuit of a charger without spark, and in particular to a circuit by which sparks can be prevented from being induced as a charge battery is pulled out from the charger far protecting the charge
BACKGROUND OF THE INVENTION
In electromotive machines (such as electric drilling machines, electric spanners, etc), in order to avoid the restriction and inconvenience due to power cord connection, power may be supplied to an electromotive machine from a battery.
There are three kinds of chargers in the prior art. For a charger requiring large power supply, a transformer is used. Since a transformer has a large volume, the charger is heavy and very inconvenient to use. If a charger is designed as an universal charger (which can be used to charge batteries of 7.2 V, 9.6 V, 16 V, etc), matching parts have to be added to the system and consequently the cost is greatly increased. The second kind of charger has a design of electron exchange. This kind of charger needs high cost to manufacture, and is not suitable for general consumers. The third kind of charger has a design of capacitor charging. It is most economic and has a light weight, but in general it often sparks (electric arc) on the terminal as the battery is pulled out. Therefore, the semiconductor device in the charger gets very high current peak which may cause a dangerous accident. Sometimes, even the whole charger may burn out.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide a protecting circuit of a charger without spark. A sensing terminal and a receptacle are installed in a charge battery and the charger, respectively. During charging, the charging circuit within the charger will detect whether the battery is pulled out from the charger by monitoring the sensing terminal. If the battery is pulled out, the power source will be turn off in time before the positive terminal disconnects so that no voltage will be sent from the charger in order to prevent spark from being generated. Therefore, the charger is protected from being burned out by high voltage spark.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.


REFERENCES:
patent: 5477130 (1995-12-01), Hashimoto et al.
patent: 5793186 (1998-08-01), Watabe et al.
patent: 6008627 (1999-12-01), Narita

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