CN2479674Y

CN2479674Y - Full-automatic rapid charger

Info

Publication number: CN2479674Y
Application number: CN00251297U
Authority: CN
Inventors: 马志光
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-09-25
Filing date: 2000-09-25
Publication date: 2002-02-27
Anticipated expiration: 2010-09-25

Abstract

Disclosed is an automatic charger for rechargeable batteries and battery groups, which is characterized in that an automatic start circuit consisting of passive elements is serially coupled in the circuit of a prior button-activated charger to make the charger start without manpower. Besides, within an arbitrary time after batteries are charged and before users detach the batteries from the charger, the charger does not repeatedly charge the batteries. And thereby the costs of the automatic charger are reduced and the safe reliability of the automatic charger is improved.

Description

Economical full-automatic quick charger

The utility model relates to one group of charger for rechargable battery or batteries charging, particularly can be fast and the charger that automatically charges.

At present, known pushbutton enable quick charger is made up of the power circuit and the control circuit that are installed in the insulation crust.Below, in conjunction with Fig. 1 its course of work is described: feed civil power when charger but do not plug power brick (one group of series-connected cell is installed in the insulation crust; Its schematic diagram is seen in the frame of broken lines of Fig. 1 lower right corner) preceding, the normally-closed contact J1-1 of relay J 1 does not constitute the loop; The coil of relay is obstructed, so each indicator light does not all work, charger is not worked.When plugging power brick and preparing startup, press and often open button K1, the J1 coil gets electric adhesive, and J1 normally opened contact J1-2 closure not only makes the J1 self-insurance after the closure, and red charging quickly indicator light LED2 is lighted, and charger begins to charge the battery by fast charge mode; Being full of the back battery can generate heat, and (a kind of switching mode temperature protection component that is made of bimetal leaf is close to power brick and is installed to cause the interior thermoswitch TP1 of power brick.) being subjected to thermal cutoff, the J1 coil losing electricity makes J1-2 disconnect, and it is closed that J1-1 recovers, and LED2 extinguishes, and DC power supply is carried out trickle charge through R3 to battery, and green trickle charge indicator light LED1 lights simultaneously.After this, TP1 can be closed because of the decline of power brick temperature, but if do not press K1, charger can not enter the state that fills soon again.

The shortcoming of above-mentioned charger is must rely on hand to press the startup charging, does not belong to full-automatic charger; And general full-automatic charger has complex structure, the shortcoming that cost is higher.

The purpose of this utility model provides a kind of full-automatic quick charger safe, reliable, with low cost.

The purpose of this utility model is achieved in that the matching used power brick that is installed in the insulation shell of a kind of and described charger, and three pin P1, P2, P3 are set on the housing; Pin P1, P3 connect the both positive and negative polarity of power brick respectively, and pin P2 connects the end of thermoswitch TP1, the negative pole of another termination power brick of TP1; A kind of safe charging device comprises insulation shell and is installed in the interior circuit board of housing, and three socket S1, S2, S3 are set on the housing, and is corresponding with three pins of power brick respectively.Socket S1 connects the negative pole of diode D6 and D8; Socket S3 ground connection; Socket S2 succeeds the lower end of electrical equipment J1 coil and resistance R 1.The negative pole of the last termination red light emitting diodes LED2 of R1, the positive pole of LED2 connect upper end and the lower end of R4 and the right-hand member of resistance R 6 of J1 coil; The left end of R6 connects the negative terminal of diode D7, the negative terminal of the positive termination capacitor C 2 of D7 and the lower end of resistance R 5.The moving contact J1-0 of the anode of C2 and the upper end of R5 and J1 all connects the cathode output end of power circuit.The negative pole of the last termination D5 of R4, the positive pole of D5 connect the normally opened contact J1-2 of J1 and the positive pole of D6.The normally-closed contact J1-1 of J1 connects the anode of green LED LED1 and the left end of resistance R 4, the left end of the negative terminal connecting resistance R3 of LED1, and the right-hand member of R3 and R4 all links to each other with the anode of D8.Power circuit by power transformer T1 with the full-wave bridge rectifier circuit that links to each other, forms by diode D1～D4 with T1 level and be connected in parallel on this rectification circuit output end filtering capacitor C1 and constitute.The positive and negative electrode of C1 is the positive and negative output of power circuit, and the ground of negative terminal and control circuit joins.Improvement of the present utility model is to have replaced K1 in the pushbutton enable formula quick charger with these four elements of R5, R6, C2 and D7, concrete operation principle is as follows: after feeding civil power and plugging power brick, owing to C2 two ends no-voltage zero-time, positive source constitutes an immediate current loop to the C2 charging through the normally-closed contact of C2, D7, R6, J1 coil and TP1.Because of this electric current has surpassed the attract current of J1, cause the J1 action, charger enters the state that fills soon.After battery is full of, because of making TP1, heating disconnects, and J1 coil losing electricity, moving contact J1-0 and J1-2 disconnect, and J1-1 conducting, and charger enters the trickle charge state.After this power brick temperature descends, TP1 is closed once more, though at this moment the C2 upper end links to each other with the upper end of DC power supply, (D7 has blocked C2 and discharged over the ground because of charge stored on it can't discharge, make C2 lower end resistance to earth approximates infinity, so the equipotential of two ends up and down of C2 and R5.)。So, be far smaller than the attract current of J1 to the electric current on ground through C2, D7 and J1 coil from positive source.Therefore charger is still kept the trickle charge state.After only pulling up city's plug, C2 could pass through high resistance measurement R5 discharge; After electric charge release in several minutes finished, inserts city's plug once more, charger can enter the state that fills soon once more.Resistance R 6 is the small-power insurance resistance with suitable resistance, when take place abnormal conditions (as supply voltage raise, C2 punctures or serious electric leakage etc.) when causing by the electric current of R6 excessive or overlong time, R6 can burn because of overload, thereby avoided faults such as startup, caused charger to enter the situation of filling state soon repeatedly.

Owing to adopt such scheme, make the utility model not adopt any active element, but reached the purpose of control fully automatically.Have simple in structure, with low cost, safe and reliable characteristics.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the circuit theory diagrams of pushbutton enable formula charger.

Fig. 2 is circuit theory diagrams of the present utility model.

R3 is the current-limiting resistance of trickle charge among Fig. 2, and R4 is the current-limiting resistance of relay J 1 coil, and R1, R2 are the current-limiting resistance of LED 2 and LED1.D6, D8 prevent the anti-diode of misoperation partially.Insurance resistance R 6 and R3, R4 should decide according to the specification of charging voltage and relay.

Claims

1. economical full-automatic quick charger; in insulation crust; transformer, rectification filtering circuit, charging control loop are linked in sequence; it is characterized in that: after discharge resistance R5 and 2 parallel connections of startup capacitor C; the upper end links to each other with the positive output end of current rectifying and wave filtering circuit, and the lower end links to each other with the anode of the electric charge maintenance diode D7 that starts capacitor C 2, the negative terminal of D7 links to each other with overcurrent protection resistance R 6, the other end of R6 links to each other with the upper end of relay J 1, the anode of LED2 and the lower end of resistance R 4.