CN2347302Y - Mobile telephone cell charger with self-protecting circuit - Google Patents

Abstract

The utility model relates to a hand-held mobile phone charger with a protecting circuit, which is composed of a constant current source, a rectification circuit, a display circuit, a self-protecting divided circuit, etc. Owing to the adoption of the divided circuit, when a cell is fully charged, a charging circuit automatically carries out dividing so that the cell damage caused by charging the cell for a long time is avoided; meanwhile, owing to a full charge indicating circuit, compared with the chargers of the same type, the utility model has the advantages of more convenient operation, low cost, long service life, high reliability, etc. The utility model can be widely used for a table type charger and a hand-held mobile phone cell in which the cell is integrated with a charger. The utility model is a more ideal hand-held mobile phone charger.

Description

Band self-protection circuit's battery of mobile telephone charger

The utility model relates to mobile telephone battery charger technology category.

Popular mobile telephone battery charger generally has two kinds of forms on the current market, a kind of is the platform sitting posture, during charging battery is placed on platform and takes and carry out, another kind is that charger, battery are made an integral body, and this form has use, advantage such as easy to carry.Core as charger; battery self-charging circuit generally is made up of constant-current source, rectification circuit, charging display circuit, charging output circuit etc.; the constant-current source of being made up of high-voltage capacitance etc. charges to being recharged battery incessantly; this charger is because unprotected circuit; after battery is full of electricity; constant-current source will charge to battery for a long time, and going down for a long time to influence the capacity of battery and useful life.

The purpose of this utility model just provides a kind of charger with the self-protection circuit, so that after battery is filled electricity, reduces the electric current that constant-current source flows to battery automatically, reaches the purpose of protection battery.

The technical scheme of the charger that the utility model provides is, a shunt circuit is set in general charger circuit, be connected between rectification circuit and the display circuit, after being recharged battery and being full of electricity, charging current enters shunt circuit automatically, other is provided with a display circuit, is connected between shunt circuit and the charging output circuit, and battery is full of the indication of turning off the light behind the electricity.

This charger is compared with similar charger; because adopted shunt circuit; protected rechargeable battery not charged for a long time effectively and damaged; can prolong the useful life of battery greatly; be full of the electricity indication because of being provided with simultaneously; make to use convenient, can be widely used in the platform sitting posture charger and battery, the incorporate mobile phone battery of charger in.

Fig. 1 has provided a practical circuit principle schematic of this charger.Be further described below in conjunction with the operation principle of diagrammatic sketch this charger.By diode D ₁, D ₂, capacitor C, resistance R ₁Form constant-current source, produce constant charging current, by diode D ₃～D ₆Form bridge rectifier, by resistance R ₅, R ₆, diode D ₁₀Form the charging output circuit, by voltage stabilizing didoe D ₇, resistance R ₂, controllable silicon S ₁Form the threshold clamp circuit, by diode D ₈, controllable silicon S ₁, resistance R ₆Form shunt circuit, D ₈Positive pole connect the anode of rectification circuit output, D ₈Negative pole meet controllable silicon S ₁Anode, silicon controlled negative electrode connecting resistance R ₆An end, R ₆The negative terminal of another termination rectification circuit output.By green LED D ₉, triode BG ₁, resistance R ₃, R ₄, R ₆Be full of electric display circuit, D Deng composition ₉Positive pole connect the anode of rectification circuit output, D ₉Negative terminal meet triode BG ₁Collector electrode, BG ₁Emitter connecting resistance R ₆, BG ₁Base stage be connected on resistance R ₃, R ₄The connection mid point on, R ₃The other end be connected on D ₈, S ₁The connection mid point on, R ₄Another termination BG ₁Emitter.When power connection, charging relay indicating light red light emitting diodes is lighted, and A, B point voltage are V _A＞V _B, D ₁₀Conducting, charger charges to being recharged battery, voltage-stabiliser tube D ₇End, along with the raising of cell voltage, at voltage-stabiliser tube D ₇On reverse voltage also constantly raise V when battery is full of electricity _A=V _B, voltage-stabiliser tube D ₇Puncture, and be operated in clamp state, the pole tension of silicon controlled control at this moment increases, and makes the controllable silicon conducting, and the charging current that constant-current source provides enters by D ₈, S ₁, R ₆The shunt circuit of forming is recharged battery and is unlikely to be charged for a long time and damages or when making its lost of life battery charge, the voltage that rectification circuit provides passes through D thereby protected ₈, R ₃, R ₄Be added to BG ₁Base stage makes BG ₁Conducting, green LED D ₉Light, the indication charger is operated in charged state, when battery is full of electricity, because S ₁Conducting, make BG ₁Base voltage reduce, make BG inadequately ₁The conducting voltage that conducting is required, R in addition ₆The raising of last voltage makes BG ₁End light-emitting diode D ₉Extinguish, show to be full of electricity and charging end.

Claims (3)

1. battery of mobile telephone charger that has the self-protection circuit; form by constant-current source, rectification circuit, display circuit etc.; it is characterized in that being provided with a shunt circuit; be connected between rectification circuit and the display circuit; when be recharged be full of electricity electricly after; charging current enters shunt circuit, and other is provided with a display circuit, is connected between shunt circuit and the charging output circuit.

2. charger according to claim 1 is characterized in that described shunt circuit is by diode D ₈, controllable silicon S ₁, resistance R ₆Deng composition, D ₈Positive pole connect the anode of rectification circuit output, D ₈Negative pole meet controllable silicon S ₁Anode, controllable silicon S ₁Negative electrode connecting resistance R ₆An end, R ₆The negative terminal of another termination rectification circuit output

3. charger according to claim 1 is characterized in that described display circuit is by light-emitting diode D ₉, triode BG ₁, resistance R ₃, R ₄, R ₆Deng composition, D ₉Positive pole connect the anode of rectification circuit output, D ₉Negative pole meet BG ₁Collector electrode, BG ₁Emitter connecting resistance R ₆, BG ₁Base stage be connected on resistance R ₃, R ₄The connection mid point on, R ₃The other end be connected on D ₈, S ₁The connection mid point on, R ₄The other end be connected on BG ₁Emitter on

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