CN2174006Y - Multifunctional charger - Google Patents

Abstract

The utility model relates to a multifunctional charger, belonging to an electric apparatus for charging a secondary battery. Improved constant current charge is adopted; firstly, the current is larger, and the voltage is lower; the current is gradually reduced, and the voltage is gradually improved; the overcharge is avoided. The utility model has a polarity protection circuit, and the damage of the battery can be avoided. The charger has the functions that the situation of the battery can be tested, various batteries can be charged, the power off can be protected, the charging state can be monitored and displayed, and the charge is quick, the battery which can not be restored by a common charger can be restored, the output voltage of the charge can be adjusted, the output voltage range is from 1.2V to 12V, and a power supply with 110V and 220V can be used. The utility model is a multifunctional safe charger.

Description

Multifunctional charger

The utility model belongs to the equipment technical field to dry battery charge, definite say so a kind of can be to the adjustable multifunction charging device of the voltage and current of input and output.

Along with the fast development of electronics industry, chargeable electric equipment kind is also a lot.It adopts the charged battery voltage dimensional discrepancy very big, generally do not wait from 1.2 volts to 12 volts, the output voltage of existing charger mostly is 1.5 volts, and be limited to certain battery charge, these chargers generally are constant voltage or constant current charge, and constant voltage charge produces the overcurrent charging at the charging initial stage of battery, and constant current charge produced current charge in the charging later stage of battery, cross current charge the internal resistance of rechargeable battery is strengthened, the life-span of harm rechargeable battery.

The purpose of this utility model provides a kind of safety New-type charge device whole to Adjustable Output Voltage.Take the constant current charge mode, the charging initial stage with big electric current small voltage, along with the rising charging current of charging voltage reduces, avoided general charger to a certain degree accept again owing to cell voltage is not discharged into charging or the charging interval long causing overcharge.Can prolong the life-span of rechargeable battery like this, and the irreclaimable refuse battery of other chargers is recovered again, facts have proved in a large number, this device can make its resurrection to the waste and old rechargeable battery charging of the high internal resistance of 80 percent different voltages.

The utility model is to realize like this; circuit compositions such as 110 volts or 220 volts rectifying and wave-filterings of civil power, charging control, battery polar protection, quick charge, characteristics are to have adopted TL494 pulse-width modulation assembly to reach to connect in rechargeable battery polarity to prevent the battery protecting circuit that damages inverse time.Civil power is chosen charging voltage by rotary switch after the transformer step-down, by rectification, filtering produces direct voltage, through charging circuit, to battery charge.Owing to adopted N channel field-effect pipe as long as suitably adjust canopy, voltage between source electrodes, size with regard to the may command charging current, and the canopy utmost point, source voltage is subjected to the TL494 pulse-width modulation to export 8 foot control systems, when cell voltage is lower than setting, the reverse input voltage of TL494 sampling amplifier raises, its output voltage reduces, the TL494 output voltage is increased, electric current strengthens between raceway groove field effect transistor canopy source electrode, and the voltage of rechargeable battery raises, and vice versa, this just realizes big electric current small voltage of charging initial stage, the later stage electric current reduces voltage to be increased, and the charging later stage, outer battery carried out low current charge, to keep the own loss of battery.The astatic multivibrator that the polar protective circuit of battery is made up of transistor 23,24 etc. and see Fig. 2 by transistor 25() etc. the drive circuit of loudspeaker formed form; when battery polar is correct; circuit is not worked; when its polarity connects inverse time; the multi-harmonic self-excited oscillation circuit starting of oscillation; loudspeaker ring, and LED flash is arranged, and can avoid battery to damage like this.

The utility model can be by SW1(Fig. 2) carry out 220 volts and 110 volts of alternating currents outputs.Also rechargeable battery can be added to 26 and carry out quick charge.

The beneficial effects of the utility model: 1. in to the rechargeable battery charging process, charging voltage and electric current are regulated as required automatically, be prolonged the useful life of rechargeable battery.2. but whether test battery need charge, and whether has been full of electricity, recharge after whether discharging and battery necrosis can not recover.3. to fluid sulphuric acid storage battery (storage battery) charging, to general rechargeable battery (1-7 number) and button cell charging.To computer equipment, the charging of the rechargeable battery of communication equipment reaches the small-sized sealing battery charge.Be equipped with plug, clip, the first-class lead-out terminal of magnetic for this reason, realize dissimilar battery charge.4. in charging process, during outage, charging device breaks away from battery pack automatically, can not cause idle discharge, can recover charging when sending a telegram here automatically again.5. can see that voltage, electric current show from panel in the charging process.6. ought accidentally polarity be connect inverse time, inform the staff, not recharge, prevent to damage battery by polar protective circuit.7. by change over switch, can realize quick charge.8. this device can charge to the high internal resistance rechargeable battery that general charger can't recover.9. export charging voltage adjustable continuously (1.2-12 volt).The utility model is the multifunctional safe charging device.

Now contrast the description of drawings embodiment: figure-1 expression multifunctional charger dial plate schematic diagram, 1 be casing, 2 for voltage, electric current option table, 3 for the electric current and voltage selector switch, 4 for normal and alarm lamp, 5 for output voltage select knob, 6 for battery case, 7 for the lead-out terminal storage bin, 8 for 110/220V input change over switch, 9 for 110/220V supply socket, 10 be that input current jack, 11 is that mains switch, 12 is a fast charge switch.Figure-2 is the multifunctional charger circuit diagram.220 volts of civil powers are after transformer 13 step-downs, select required charging voltage by rotary switch 14, finish rectification by rectifier 15 and capacitor 16, filtering obtains required direct voltage, this direct voltage is by fuse 17, N channel field-effect pipe 18, inductance 19,21 pairs of rechargeable batteries of resistance 20 and diode charge, owing to use N channel field-effect pipe, as long as suitably the voltage VGS between the adjustment canopy utmost point and the source electrode is with regard to the size of may command charging current, and the size of VGS is subjected to 8 foot control systems of TL494 pulse-width modulation assembly 22 outputs, when cell voltage is lower than setting, the voltage of the reverse input end of pulse-width modulation assembly 22 sampling amplifiers will raise, the sampling amplifier output voltage reduces, thereby the arteries and veins that makes 8 pin of TL494 assembly 22 outputs fills width and broadens, output voltage increases, the voltage of VGS is raise, the canopy electrode current of transistor 18 increases, the electric current of rechargeable battery is increased, charging voltage also just raises, when battery charging voltage reaches setting, the reverse input end voltage of TL494 assembly 22 sampling amplifiers will reduce, and the sampling amplifier output voltage raises.Thereby the pulse duration of TL494 assembly 22 outputs 8 pin is narrowed down, and output voltage reduces, and VGS also just reduces, and charging current reduces, and this little electric current can replenish the very little self discharge stream of battery.Thereby realized big electric current small voltage of charging initial stage, increased that the charging later stage is carried out low current charge to battery, to keep the own loss of battery along with the increase charging current in charging interval reduces voltage.The loudspeaker driver circuit that astatic multivibrator that the battery polar protective circuit is made up of transistor 23, transistor 24 and transistor 25 are formed is formed, when battery polar connect correct the time, circuit is not worked.When battery polar connects inverse time, astatic multivibrator begins starting of oscillation, and loudspeaker ring, and the light-emitting diode conducting begins flicker.Can avoid because polarity connects on the contrary battery is damaged.The utility model not only can be realized 220 volts and 110 volts of alternating current outputs by rotary switch 27, also rechargeable battery can be added to 26 places, realizes the purpose of quick charge.

Claims (2)

1, a kind of multifunction charging device that input and output voltage and electric current are regulated; form by power transformer, rectifier, filter and charging circuit, it is characterized in that adopting the TL494 pulse-width modulation assembly of control output voltage and electric current and prevented that rechargeable battery polarity from connecing the protective circuit of anti-damage battery.

2, multifunctional charger according to claim 1 is characterized in that horn circuit that astatic multivibrator that battery protecting circuit is made up of transistor Q4, Q7 and Q5 form constitutes.

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