GB2265266A

GB2265266A - Circuit for protecting a battery against surge current output

Info

Publication number: GB2265266A
Application number: GB9205873A
Authority: GB
Inventors: Tai-Her Yang
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-03-18
Filing date: 1992-03-18
Publication date: 1993-09-22
Also published as: GB9205873D0

Abstract

The circuit comprises a capacitor 103 connected across the battery 101. An inductor 102 may be connected in series between the battery 101 and capacitor 103. <IMAGE>

Description

TITLE PROTECTION CIRCUIT AGAINST STORAGE CELL SURGE CURRENT OUTPUT SUMMARY OF THE INVENTION: PROTECTION CIRCUIT AGAINST STORAGE CELL SURGE CURRENT OUTPUT is to disclose a kind of circuit which uses storage cell output end serialized first to induction current limit element and then parallelled with an auxiliary capacity, and at the time when impulse surge current is needed, auxiliary capacity will be ahead of the storage cell to drive a load, and surge current crest value of the cell is repressed down by the restaint of electric induction, and at the time when the output of cell is normal, electric induction will not restrain the steady DC ( resistance value in electric induction is very low ), and supply current for surge load can be maintained by discharge output from auxiliary capacity, and because discharge capacity of storage cell is measured by Ampere/hour, when output current rises, total Ampere/hour capacity is lowered by inner impedance and inner temperature rising, so that at the time when surge current is needed constantly, cell temperature rise is lowered and its discharge capacity value can be risen, and when low cost is required, induction current limit element can be omitted, and it is enough to use only capacity of storage cell parallel structure so as to share the burden of surge current needed.

BRIEF DESCRIPTION OF THE DRAWING FIG 1 is a view of PROTECTION CIRCUIT AGAINST STORAGE CELL SURGE CURRENT OUTPUT.

DETAILED DESCRIPTION OF THE INVENTION: Conventional storage cell is widely used because it is portable and convenient, and its mini type is often used for portable appliances, electric power tools, communication media, and computer, and its large type is used for electric vehicles, and so on. In general, capacity of storage cell is measured by Ampere/hours (AH), but in practical estimation, when its output current value becomes larger, the Ampere/hour value becomes lower, as attached Table 1, the reason is that larger output results in inner temperature rise and increase of impedance loss in a cell, so it is harmful for a cell to have over constant surge current requirement. However, surge clurrent requirement is often derived from the demand for load, such as the demand resulted from operation of transient turning a large lamp on, or constantly drive of loaded motor.

The design of this invention aims to overcome said defects of conventional cell circuit as illustrated in FIG 1, which uses storage cell output and serialized first to induction current limit element and then parallel led with an auxiliary capacity so as to form a protection circuit, its main structure is illustrated as follows: -- 101 is a storage cell: it is used to supply DC electric energy, including the chargable type and the non-chargable type; -- 102 is an electric induction impedance element which is serialized to storage cell output end, when surge current demand comes, storage cell output will gradually rise because of the restaint from induction so as to avoid the preliminary surge current supplied by the storage cell; -- 103 is a chargable and dischargable capacitor which is parallel led with serialized output ends of storage cell and electric induction element, and at usual time fully saturated charge is charged to form a momentary auxiliary cell, when surge current demands, the charge will discharge and output so as to improve electric impedance element to form a voltage drop and to supply preliminary surge current.

By means of said circuit device, we can operate diverse situations; for example, when storage cell drives power tools or power vehicles, it can effectively deduct the surge current value of storage cell and maintain the surge current demand of load, inaddition, in the application of the simple type, the capacitor and storage cell can also be parallelled with each other ( or a monoblock structure ), and when surge current demand comes, it will be share by capacitor so as to restain part of the surge current.

This kind of circuit is less effective than that which is serialized to electric induction, but it provides us with a selection when we consider the economic benefits.

Said storage cell induction and capacitor can be monoblockly moulded through injection molding, or be jointly moulded and structured together by independent elements.

and good function. Please examine it according to the patent law.

Claims

CLAIMS:

1. PROTECTION CIRCUIT AGAINST STORAGE CELL SURGE CURRENT OUTPUT is to disclose a kind of circuit which uses storage cell output end serialized first to induction current limit element and then parallelled with an auxiliary capacity, and at the time when impulse surge current is needed, auxiliary capacity will be ahead of the storage cell to drive a load, and surge current crest value of the cell is repressed down by the restaint of electric induction, and at the time when the output of cell is normal, electric induction will not restrain the steady DC ( resistance value in electric induction is very low ), and supply current for surgee load can be maintained by discharge output from auxiliary capacity, and its main structure comprising, -- 101 is a storage cell: it is used to supply DC electric energy, including the chargable type and the non-chargable type; -- 102 is an electric induction impedance element which is serialized to storage cell output end, when surge current demand comes, storage cell output will gradually rise because of the restaint from induction so as to avoid the preliminary surge current supplied by the storage cell; -- 103 is a chargable and dischargable capacitor which is parallel led with serialized output ends of storage cell and electric induction element, and at usual time fully saturated charge is charged to form a momentary auxiliary cell, when surge current demands, the charge will discharge and output so as to improve electric impedance element to form a voltage drop and to supply preliminary surge current; by means of said circuit device, we can operate diverse situations; for example, when storage cell drives power tools or power vehicles, it can effectively deduct the surge current value of storage cell and maintain the surge current demand of load.

2. As claimed in claim 1, PROTECTION CIRCUIT AGAINST STORAGE CELL SURGE CURRENT OUTPUT wherein the capacitor and storage cell can also be parallelled with each other ( or a monoblock structure ), and when surge current demand comes, it will be share by capacitor so as to restain part of the surge current.