CN2183630Y

CN2183630Y - Intelligent quick-charging device

Info

Publication number: CN2183630Y
Application number: CN 94207188
Authority: CN
Inventors: 侯云翔
Original assignee: BEIJING CHENGUANG COMPUTER Co
Current assignee: BEIJING CHENGUANG COMPUTER Co
Priority date: 1994-03-22
Filing date: 1994-03-22
Publication date: 1994-11-23
Anticipated expiration: 2004-03-22

Abstract

The utility model relates to an intelligent quick-charging device, which is composed of a switching power supply of a converter type, a switching power supply of a series regulation type, an intelligent control module, a sample circuit, etc. A minus delta V digital currentless detection mode with fine resolution is adopted; the charging state of a storage battery can be exactly judged; a quick charge mode is converted into a trickle charge mode in time; practices prove that the detection mode is very reliable and sensitive; the charging sufficiency of the battery can be ensured without overcharge. The device is also provided with a temperature protection and a timing control circuits. When the battery has overtemperature, the charger automatically converts into the trickle charge mode. The utility model can carry out quick charge for nickel-cadmium batteries of which the number is from two to eight without using any converting switch; therefore, the charger is suitable for charging batteries of the radio installations of a cellular network, interphones, small-size radio stations, camcorders, laptops, palmtops, notebook computers, etc.

Description

Intelligent quick-charging device

The utility model relates to a kind of charger, the intelligent quick charger that particularly a kind of utilization-△ V principle relative voltage control method is made.

Conventional charger is 0.1C to the charge rate of rechargeable battery, and approximately needs 14 hours could be with the exhausted cell full charge to adopt such speed.In charging process, keep long-time charging with such speed, the temperature and pressure of inside battery can not rise significantly, though compare safety like this, the long-time continuous charging will influence the maximum life of storage battery.Therefore overcharge for a long time must be limited in be full of electricity after, in time charging current is transformed into lower trickle charge, in order to compensate the energy loss that the rechargeable battery self discharge causes.

If adopt the high speed charging of big electric current, its charging process must be controlled, and behind the battery full charge, charge rate must be reduced to safe trickle charge speed at once, otherwise can overcharge causes that battery heats up and too high battery is damaged, when serious even can blast.

At present, the quick charger of selling on the market adopts timing controlled, temperature control, the control of battery ceiling voltage or three's Comprehensive Control usually, but these modes all exist all problems that can't overcome, can not guarantee battery 100% abundance and don't produce to overcharge, its reliability and stability are all relatively poor.

Adopt timer can avoid battery to overcharge for a long time, but, can't consider the capacity and the charged state of battery because the time is fixed, the therefore battery charge deficiency that can have, have then to overcharge.

After the battery abundance, the electric weight that continues to charge into will be converted into heat energy loss in battery, though can judge whether full charge of battery by the thermistor that is fitted together with battery pack, but because the response time of thermistor is longer, add the influence of ambient temperature, and the thermistor of many batteries of inferior brand of selling on the market, many do not meet strict unified regulation and requirements are arranged, this method can not accurately detect the charged state of battery.

Absolute ceiling voltage control is a kind of very complicated control method, the voltage of battery changes with ambient temperature, the battery of different manufacturers, different capabilities, its detected voltage is different, and in the life-span of chargeable battery, the Changing Pattern that fills the tortoise voltage curve also is unforeseen, so this method is also inadvisable.

The purpose of this utility model is exactly at above-mentioned defective, and a kind of intelligent quick charger that can accurately judge storage battery full charge state is provided.

The purpose of this utility model is achieved in that intelligent quick charger is to be made of power unit and charging control section branch, is characterized in that: push-pull type power driving circuit that power unit constitutes by rectifier B1, feedback transformer BL3 and by triode VT1, VT2 and rectifier diode VD7 and filter capacitor C4 constitute; The output of power unit is connected to the emitter of adjusting pipe VT3 through diode D9; Constitute the charging control section branch by adjusting pipe VT3, controlling diaphragm piece IC2 and peripheral cell, its output termination is recharged the two poles of the earth of battery.

--the base stage of triode VT1, VT2 is connected on secondary BL1, the BL2 of feedback transformer BL3 through resistance R 4, R5 respectively in the described power unit, and feedback transformer BL3 is serially connected on the push-pull output circuit; The limit of paying of transformer B2 meets diode VD7 respectively, its output termination filter capacitor C4.

--triode VT4, VT5 were connected into drive circuit during described charging control section was divided, its output is connected on the base stage of adjusting pipe VT3, the input of three terminal regulator IC1 connects power supply by R19, the power input Vcc of output termination control module IC2, the PWM end of IC2 is connected to the base stage of VT5 by resistance R 7, R5 is terminated at an end of resistance R 16, another termination charger output of R16, and the collector electrode of adjusting pipe VT3 connects another output of charger through choke induction L1.

--described control module is thick film integrated circuit CHB801.

Because intelligent quick charger adopts thick film integrated circuit CHB801, at first realized the most advanced in the world-△ V principle relative voltage control method at home, this method is proved to be the anti-overcharge cut-off method of quick charge very reliably from theoretical, experiment and actual the use.By the charging voltage curve of battery as can be known, when the battery full charge, internal temperature rises, the voltage of battery slightly descends, CHB801 detects the situation of change of cell voltage at any time and is stored in the detector through A/D conversion, in charging process, when negative growth or zero growth rate appear in cell voltage, CHB801 detector output control signal in time is converted to trickle charge with quick charge.

In order to strengthen the protection to battery, the CHB801 thick film circuit has also added regularly turn-off function, do not occur at the charging voltage curve-few situation of △ V under, as battery failures, regularly breaking circuit can play a protective role.

In addition, the CHB801 controller also has the too high protection of cell voltage, brownout protection, battery reverse connecting protection, the too high protection of short-circuit protection and battery temperature.

What is more important: the utility model adopts pulse charging and pulsed discharge circuit, this charging modes does not produce the memory effect of battery, and can eliminate the memory effect that has produced in the battery very effectively, whole charging process has realized intellectuality, need not outside artificial interference, the convenient use.

Power supply of the present utility model adopts Switching Power Supply mode and integrated design, its volume is little, in light weight, be easy to carry about with one, and also can use DC power supply, as on automobile, using, because charging current is a pulse width modulation controlled, (alternating current is 180V～240V, and direct current is 12V～24V), can both realize the constant current charge to battery in very big voltage range.

The utility model also is provided with the charging output interface, can fill tortoise to the nickel-cadmium cell with different magnitudes of voltage (2.4V to 9.6V) of different purposes, different capabilities, has expanded the use approach of this charger.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1, the utility model power principle block diagram;

Fig. 2, the utility model circuit diagram and embodiment.

As shown in Figure 1 and Figure 2: the 220V electric main provides voltage for after C1, the C2 filtering push-pull type power driving circuit that is made of VT1, VT2 through the B1 rectification, and its output is closed through transformer B2 corner, and exports the direct voltage of 20V after VD7 rectification, C4 filtering.

The BL3 that is serially connected in push-pull output circuit is a feedback transformer, and its secondary BL1 and BL2 provide driving voltage to the base stage of VT1, VT2 respectively, so this circuit constitutes self-excited oscillation circuit or inverter circuit, frequency of oscillation is by C3 and R3 decision.

This charger also can be directly by from the outside DC-voltage supply of JACK1 socket, as vehicle power.

The charging control section branch is made of charging current adjustment pipe VT3 and control module CHB801, and IC1 is a circuit of three-terminal voltage-stabilizing integrated, provides control module required voltage.

R16 is the charging current sample resistance, pressure drop on the R16 feeds back to the RS terminal of CHB801 by adjusting the mode of pulsewidth, from the modulated pulse-width control signal of PWM end output, the base stage that the drive circuit that constitutes through VT4, VT5 is added in electric current adjustment pipe VT3 realizes constant current charge.

It is quick charge that PWM holds exportable three kinds of waveforms, trickle charge and stop charging, and charged state can be by the light-emitting diode VD13 indication that is connected on the LED pin, and VD12 is a power supply indicator, and L1 is a choke induction, and VD11 is a fly-wheel diode.Charging current value can be by 11 decisions of the resistance R on the REF pin.On the voltage sampling end VAC of cell voltage through being added in CHB801 after R13, the R15 dividing potential drop, module CHB801 follows the tracks of the situation of change that VAC goes up voltage, when cell voltage occurs in time quick charge being converted to trickle charge when negative increment changes, realize quick-charging intelligentization.

TEMP terminal on the module CHB801 is connected with the outside negative tempperature coefficient thermistor terminal that is recharged in the battery, and when battery temperature raise, the resistance of thermistor descended, and when temperature rose to 45 ℃, module stopped quick charge.Simultaneously, abnormal conditions on VAC, occur, when too high as cell voltage, low excessively, battery reversal connection or short circuit, also can in time stop to fill fast tortoise, be not damaged with the protection battery.

Also be provided with timer in the module CHB801, in the quick charge process, do not occur also quick charge to be converted to the trickle charge state under few situation that negative increment changes (as the inside battery open circuit).

Claims

1, a kind of intelligent quick charger is to be made of power unit and charging control section branch; It is characterized in that: push-pull type power driving circuit that power unit constitutes by rectifier B1, feedback transformer BL3 and by triode VT1, VT2 and rectifier diode VD7 and filter capacitor C4 constitute; The output of power unit is connected to the emitter of adjusting pipe VT3 through diode D9; Constitute the charging control section branch by adjusting pipe VT3, controlling diaphragm piece IC2 and peripheral cell, its output termination is recharged the two poles of the earth of battery.

2, intelligent quick charger according to claim 1, it is characterized in that: the base stage of triode VT1, VT2 is connected on secondary BL1, the BL2 of feedback transformer BL3 through resistance R 4, R5 respectively in the power unit, and feedback transformer BL3 is serially connected on the push-pull output circuit; The limit of paying of transformer B2 meets diode VD7 respectively, its output termination filter capacitor C4.

3, intelligent quick charger according to claim 1, it is characterized in that: triode VT4, VT5 were connected into drive circuit during charging control section was divided, its output is connected on the base stage of adjusting pipe VT3, the input of three terminal regulator IC1 connects power supply by R19, the power input Vcc of output termination control module IC2, the PWM end of IC2 is connected to the base stage of VT5 by resistance R 7, R5 is terminated at an end of resistance R 16, another termination charger output of R16, the collector electrode of adjusting pipe VT3 connects another output of charger through choke induction L1.

4, according to claim 1,3 described intelligent quick chargers, it is characterized in that: described control module is thick film integrated circuit CHB801.