CN2147677Y - Automatic charger for cadmium-nickel cell - Google Patents

Abstract

The utility model discloses an automatic charger for cadmium-nickel cells which charges for nickel-cadmium cells in a constant current mode and has an overcharge preventing protection device, and the automatic charger for cadmium-nickel cells is mainly composed of a 555 time-base integrated circuit, triodes, diodes, resistances, capacitances and a power supply transformer. The automatic charger for cadmium-nickel cells can charge 1-4 sections of AA shaped nickel-cadmium cells, and can also charge 1-4 sections of LR6 shaped alkaline cells. When the charge getting to the threshold voltage of a cell, the automatic charger for cadmium-nickel cells can automatically stop charging, which is indicated by an LED in a luminous mode; the lifetime of the cell is effectively prolonged. The utility model has the advantages of convenient operation and strong practicability, and is an automatic charger with favorable effect and strong practicability.

Description

Automatic charger for cadmium-nickel cell

The utility model is to the device of ickel-cadmium cell charging, belongs to the field that charges the battery.

The volume low capacity is big, internal resistance is little, the number of times of charging repeatedly reaches 1000 inferior advantages and is widely used owing to ickel-cadmium cell has, and be used for the charger of this battery at present, generally be just to battery charge after transformer step-down and rectification, even only use after capacitance decompression and the rectification just to battery charge, though it is simple in structure, but owing to do not prevent the device that overcharges, just on specification, illustrate how long fill mostly, and in fact, be difficult to accomplish at every turn all to end in required time charging, so that overcharge and battery life is shortened dramatically.

The purpose of this utility model is in order to overcome above-mentioned weak point of the prior art, a kind of constant current charge is provided and prevent to overcharge and prolong battery useful life every the nickel-based battery automatic charger.

Technical measures of the present utility model are: with one 555 type time-base integrated circuit device of making comparisons, form constant-current source to battery charge with transistor circuit, when the voltage that is recharged the pond reached threshold voltage, charger then stopped charging automatically, and was indicated by lumination of light emitting diode.This charger is made up of shell, battery folder and converter, and wherein, converter is by power transformer T ₁, attaching plug XP, time-base integrated circuit IC ₁, transistor V ₁, rectifier diode D ₁-D ₆, voltage stabilizing didoe D ₇, light-emitting diode D ₈, D ₉, resistance R ₁-R ₁₀, adjustable resistance R ₁₁, capacitor C ₁-C ₅With double-point double-throw switch S ₁, S ₂Form, its annexation is T ₁Be connected T with the 220V AC power behind the elementary XP of connecing ₁Secondary through D ₁-D ₄Rectification and C ₁After the filtering, the direct voltage minus earth of output, positive pole meets IC ₁4,8 pin and resistance R ₁, R ₃, R ₈, R ₁Another termination R ₂And IC ₁7 pin, R ₂Another termination D ₅Negative pole, C ₂And IC ₁2 pin, D ₅Positive pole meets C ₃And IC ₁6 pin, IC ₁1 pin ground connection, IC ₁5 pin meet C ₄And S ₁Moving contact, R ₃Another termination R ₁₁And D ₇Negative pole, D ₇Plus earth, R ₁₁Another termination R ₄And S ₁Fixed contact 1, R ₄Another termination R ₅And S ₁Fixed contact 2, R ₈Another termination D ₈Positive pole, D ₈Negative pole meets R ₉, D ₉Positive pole and IC ₁3 pin, R ₉Another termination V ₁Emitter, D ₉Negative pole meets R ₆, C ₅And V ₁Base stage, V ₁Collector electrode meets R ₇And D ₆Positive pole, D ₆Negative pole meets R ₁₀And S ₂Moving contact, R ₁₀Another termination IC ₁6 pin, S ₂Fixed contact 1 meet battery folder X ₁, S ₂Fixed contact 2 meets battery folder X ₂, battery folder X ₃And C ₁-C ₅And R ₅-R ₇Other end ground connection, one group of ickel-cadmium cell GB ₂Negative pole meets X ₃, positive pole meets X ₂, another group ickel-cadmium cell GB ₁Negative pole meet X ₂, positive pole meets X ₁

Accompanying drawing is a circuit connection diagram of the present utility model.

Referring to accompanying drawing, T ₁Use and be output as 10-11V, power power transformer, IC as 1-2W ₁Use 555 time-base integrated circuits of NE555, CA555 or FX555 model, V ₁Use the positive-negative-positive triode of 3CG5 or models such as 3AX81,3AX83, D ₇Use the 6.2-7.5V voltage stabilizing didoe of models such as 2CW55,2CW14,2CW7D or 2CW21C, GB ₁And GB ₂Be a joint or two joint AA type ickel-cadmium cell or LR6 type alkaline batteries, when a Battery pack is charged, then battery be connected on X ₂And X ₃Between, and with S ₁And S ₂Be placed on moving contact and fixed contact 2 position contacting, when two Battery packs are charged simultaneously, then two Battery packs be connected on X respectively ₂, X ₃And X ₁, X ₂Between, and with S ₁And S ₂Be placed on moving contact and fixed contact 1 position contacting, during adjustment, the battery of different model be charged to threshold voltage by the timing mise-a-la-masse method earlier, transfer R then ₁₁Make D ₈Luminous and at R ₁₁The relevant position marks mark and gets final product.During use, energized, IC ₁3 pin be output as high level, D ₉Luminous indication is also given V ₁Provide bias voltage, V ₁Collector electrode is promptly exported constant current, through D ₆And S ₂Give battery GB ₁And GB ₂Charging, this moment is lower because of the voltage that is recharged the pond, passes through R ₁₀Receive IC ₁The voltage of the 6th pin is lower than R ₄, R ₅Through S ₁Offer IC ₁The comparative voltage of the 5th pin, IC ₁The 3rd pin keeps high potential always, makes V ₁The output constant current charges the battery, when cell voltage rises to threshold voltage, and IC ₁The 3rd pin just becomes low level by high level, at this moment, and V ₁Stop output because of losing voltage, charging stops, because R ₈And D ₈Between voltage increase, make D ₈Luminous, the indication charging finishes, because D ₆Effect battery current is not flow backwards, and battery passes through R ₁₀To IC ₁Discharging current very little, because of 555 internal logics relations, can in for a long time, keep IC ₁The 3rd pin is a low level, the generation of the phenomenon that effectively prevents to overcharge.When being recharged the pond and not connecing or do not connect, D ₈, D ₉Then take turns luminous indication, after battery was connected, it is normal that circuit just recovers.

The utility model uses constant current charge and can stop charging automatically, thereby the harm of having avoided overcharging battery being produced, make battery can reach normal useful life, can also indicate whether to charge normal and indicate the operating state of charging end, extremely easy to use, can charge to AA type ickel-cadmium cell, also can also have advantage simple in structure, cheap to the charging of LR6 type alkaline battery, it is good, the practical automatic charger of a kind of result of use.

Claims (2)

1, a kind of ickel-cadmium cell automatic charger is made up of shell, battery folder and converter, it is characterized in that converter is by power transformer T ₁, attaching plug XP, time-base integrated circuit IC ₁, transistor V ₁, rectifier diode D ₁-D ₆, voltage stabilizing didoe D ₇, light-emitting diode D ₈, D ₉, resistance R ₁-R ₁₀, adjustable resistance R ₁₁, capacitor C ₁-C ₅With double-point double-throw switch S ₁, S ₂Form, its annexation is T ₁Be connected T with the 220V AC power behind the elementary XP of connecing ₁Secondary through D ₁-D ₄Rectification and C ₁After the filtering, the direct voltage minus earth of output, positive pole meets IC ₁4,8 pin and resistance R ₁, R ₃And R ₈, R ₁Another termination R ₂And IC ₁7 pin, R ₂Another termination D ₅Negative pole and C ₂And IC ₁2 pin, D ₅Positive pole meets C ₃And IC ₁6 pin, IC ₁1 pin ground connection, IC ₁5 pin meet C ₄And S ₁Moving contact, R ₃Another termination R ₁₁And D ₇Negative pole, D ₇Plus earth, R ₁₁Another termination R ₄And S ₁Fixed contact 1, R ₄Another termination R ₅And S ₁Fixed contact 2, R ₈Another termination D ₈Positive pole, D ₈Negative pole meets R ₉And D ₉Positive pole and IC ₁3 pin, R ₉Another termination V ₁Emitter, D ₉Negative pole meets R ₆, C ₅And V ₁Base stage, V ₁Collector electrode meets R ₇And D ₆Positive pole, D ₆Negative pole meets R ₁₀And S ₂Moving contact, R ₁₀Another termination IC ₁6 pin, S ₂Fixed contact 1 meet battery folder X ₁, S ₂Fixed contact 2 meet battery folder X ₂, battery folder X ₃And C ₁-C ₅And R ₅-R ₇Other end ground connection, a Battery pack GB ₂Negative pole meet X ₃, positive pole meets X ₂, another Battery pack GB ₁Negative pole meet X ₂, positive pole meets X ₁

2, ickel-cadmium cell automatic charger as claimed in claim 1 is characterized in that T ₁Use and be output as 10-11V, power power transformer, IC as 1-2W ₁Use 555 time-base integrated circuit pieces, V ₁Use the positive-negative-positive transistor, D ₇Use the 6.2-7.5V voltage stabilizing didoe.

Images