CN2211667Y

CN2211667Y - Fast charger for secondary battery

Info

Publication number: CN2211667Y
Application number: CN 94245649
Authority: CN
Inventors: 刘承玺
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-11-30
Filing date: 1994-11-30
Publication date: 1995-11-01
Anticipated expiration: 2004-11-30

Abstract

The utility model discloses a fast charger for a secondary battery, comprising an impulsator (1), a frequency dividing circuit (2), a logic circuit (3), a magnifying shaping circuit (4), a test pulse forming circuit (13), a charge and a discharge devices (7), a sampling shaping circuit (14), a control impulse forming circuit (16), a short circuit protective circuit (17), a charging termination control circuit (19), a starter (20), etc. The charging of the charger of the utility model is fast, the charging capacity is sufficient, the rate of gasification of the secondary battery is low, and the life time of the secondary battery is long. The charger can carry out the automatic detection in the charging process, and the utility model can automatically stop the charging, when the charging is completed.

Description

Fast charger for secondary battery

The utility model is the charging device of using about storage battery.

The charger of selling on the market is of a great variety, is mostly to adopt transformer step-down, the charger that diode rectification or bridge rectifier constituted.This class charger weak point is, storage battery can produce polarization phenomena, and the rate of gasification height makes the charge in batteries quantity not sufficient, and is easily aging, and charging rate is slow.

The purpose of this utility model is to overcome weak point of the prior art, provides that a kind of charging rate is fast, the charge volume foot, low, the long service life of storage battery rate of gasification, the charger of low cost of manufacture and energy savings.

Charger of the present utility model is achieved by following technical proposals.

Pulse generator ［ 1 ］ connects frequency dividing circuit ［ 2 ］, frequency dividing circuit ［ 2 ］ connect by with or, the logical circuit ［ 3 ］ that constitutes of not gate, logical circuit ［ 3 ］ connects amplification and rectification circuit ［ 4 ］, power amplification circuit ［ 9 ］, test pulse respectively and forms circuit ［ 13 ］; Described amplification and rectification circuit ［ 4 ］ connects power successively and promotes level ［ 5 ］, power stage ［ 6 ］, discharges and recharges device ［ 7 ］; Described power amplification circuit ［ 9 ］ connects power stage ［ 10 ］ respectively and discharges and recharges device ［ 7 ］; Described test pulse forms circuit ［ 13 ］ and accesses sample shaping circuit ［ 14 ］, control impuls formation circuit ［ 16 ］ respectively; Described control impuls forms circuit ［ 16 ］ and also accesses sample shaping circuit ［ 14 ］, short-circuit protection circuit ［ 17 ］, charging termination control circuit ［ 19 ］ respectively; Described charging termination control circuit ［ 19 ］ also connects starter ［ 20 ］ and K switch respectively; Described K switch connects power supply ［ 18 ］.

The described device ［ 7 ］ that discharges and recharges also can insert change over switch ［ 8 ］, described change over switch ［ 8 ］ connects conversion control circuit ［ 15 ］, described conversion control circuit ［ 15 ］ connects control impuls respectively and forms circuit ［ 16 ］ and multiplexer ［ 11 ］, described multiplexer ［ 11 ］ also connects test pulse respectively and forms circuit ［ 13 ］, and display ［ 12 ］, sampling shaping circuit ［ 14 ］ and control impuls form circuit ［ 16 ］.

The utility model will be further described below in conjunction with accompanying drawing and embodiment.

Fig. 1 is the circuit block diagram of the utility model charger;

Fig. 2 is the circuit diagram that the test pulse in the utility model charger forms circuit;

Fig. 3 is the circuit diagram that the control impuls in the utility model charger forms circuit.

Shown in Fig. 1 is the circuit block diagram of two-way charger.Pulse generator ［ 1 ］ produces the square-wave pulse of 16KHz and presents to the frequency dividing circuit ［ 2 ］ by two cascades, and described frequency dividing circuit ［ 2 ］ can be selected 2 74LS161 integrated circuits for use.Signal behind the frequency division through with or, NOT gate logic circuit ［ 3 ］ forms three kinds of pulses, i.e. charging pulse, discharge pulse and test control impuls.Described charging pulse is delivered to amplification and rectification circuit ［ 4 ］, delivers to power then successively and promotes level ［ 5 ］, power stage ［ 6 ］, discharges and recharges device ［ 7 ］ and change over switch ［ 8 ］, can charge to I or II road storage battery.The described device ［ 7 ］ that discharges and recharges adopts diode and capacitor to constitute.

Described discharge pulse is through power-amplifier stage ［ 9 ］, power stage ［ 10 ］, discharges and recharges device ［ 7 ］, change over switch ［ 8 ］, can be to I or the battery discharging of II road.Show at display ［ 12 ］ when I or II road charge in batteries.

The effect that test pulse forms circuit ［ 13 ］ is when the battery tension on I or II road is charged to design load, exports a test pulse signal.This signal arrives control impuls and forms circuit ［ 16 ］ by multiplexer ［ 11 ］; Battery tension process multiplexer ［ 11 ］ that second signal that arrives ［ 16 ］ is I or II and the voltage signal behind the sampling shaping circuit ［ 14 ］.Control impuls forms circuit ［ 16 ］ with above two kinds of signals and the short-circuit signal process logical combination that is produced by short-circuit protection circuit ［ 17 ］, and output is by switching signal or the charging termination signal of I to the II road.The former carries out by the conversion of I to the II road change over switch ［ 8 ］ and multiplexer ［ 11 ］ by conversion control circuit ［ 15 ］, thereby decision is to charge to the I road or to the II road.If remove change over switch ［ 8 ］, display ［ 12 ］, multiplexer ［ 11 ］ and conversion control circuit ［ 15 ］, then become the single channel charger.The charging termination signal can make charger stop charging by charging termination control circuit ［ 19 ］.

Starter ［ 20 ］ is started working in order to start charger, and power supply ［ 18 ］ can produce the needed power supply of respectively organizing of charger.Utilize K switch, at any time the charging of complete charge device.

Above-mentioned sampling forms circuit ［ 14 ］ can adopt pressurizer sampling, the shaping of two-stage not gate.Described charging termination control circuit ［ 19 ］ is made of transistor and relay.Starter ［ 20 ］ is a normally closed switch, and K switch is for often connecing switch.

The third angle of voltage comparative degree LM311 is connected to reference voltage in Fig. 2.BG1, BG2 will be from delivering to second jiao of LM311 after the test control impuls that logical circuit ［ 3 ］ comes is amplified shaping, when two jiaos pulse amplitudes are higher than reference voltage, test pulse of LM311 output is to multiplexer ［ 11 ］, the charging of representing current storage battery has been charged to design voltage value, thereby the decision charger is by charging conversion or the termination charging of I to the II road.Wherein, D1 plays temperature compensation function, can improve the working stability degree of voltage comparative degree.

In Fig. 3, when charger was started working, two Q ends of 74LS74A all were in high level, are added on B4 and the B3 of 74LS08 respectively.As long as the I road is connected to storage battery, to battery tension sampling shaping, be added to the A4 of 74LS08 by multiplexer ［ 11 ］ and sampling shaping circuit ［ 14 ］, make Y4 export high level.Control I road charge in batteries by conversion control circuit ［ 15 ］.When storage battery was charged to design load, test pulse triggered 74LS74A by multiplexer ［ 11 ］, and Q2 is in low level, made the Y4 of 74LS08 also be low level.By conversion control circuit ［ 15 ］ control transformation switch ［ 8 ］ and multiplexer ［ 11 ］ by the conversion of I to the II road.If the II road is connected to storage battery, by multiplexer ［ 11 ］ and sampling shaping circuit ［ 14 ］ to its sampling shaping after, be added to the A3 of 74LS08 again through multiplexer ［ 11 ］, make Y3 be in high level, begin II road charge in batteries.When it was charged to design load, the test pulse that is come by multiplexer ［ 11 ］ triggered the 74LS74A upset, and Q1 is in low level, made the Y3 of 74LS08 also be low level.Cut off the electricity supply by charging termination control circuit ［ 19 ］, stop charging.In charging process, if short circuit phenomenon appears in the external world, then, can cut off the electricity supply immediately equally by the A4 end of short-circuit protection circuit ［ 17 ］ output one short-circuit signal to 74LS32, stop charging.

According to technique scheme, those skilled in the art can design the more charger of multichannel according to actual needs.

Fair electrical equipment of the present utility model can be widely used in the charging of various batteries. It compared with prior art has following good effect.

1. discharge and recharge and hocket, and waveform is impulse form, reasonable arrangement discharges and recharges the time. Can overcome the polarization phenomena of battery, charging rate is fast, the charge volume foot. During charging, the battery rate of gasification is low, and battery is long, and environmental pollution is little, is particularly suitable for maintenance-free battery is charged.

2. when discharging, adopt energy unloading form, make it to return for charging, energy savings, efficient height.

3. can charge in order to one road or two road batteries. When battery tension is charged to design load, can automatically realize by I to II road conversion or automatically stop charging. If short circuit appears in the external world, the meeting automatic cut-off power stops charging. Therefore, as long as a start just can move automatically by user's wish, need not person on duty, saved labour cost.

Claims

1, a kind of battery fast charger, it is characterized in that, pulse generator [1] connects frequency dividing circuit [2], frequency dividing circuit [2] connect by with or, the logical circuit [3] that constitutes of not gate, logical circuit [3] connects amplification and rectification circuit [4], power amplification circuit [9], test pulse respectively and forms circuit [13]; Described amplification and rectification circuit [4] connects power successively and promotes level [5], power stage [6], discharges and recharges device [7]; Described power amplification circuit [9] connects power stage [10] respectively and discharges and recharges device [7]; Described test pulse forms circuit [13] and accesses sample shaping circuit [14], control impuls formation circuit [16] respectively; Described control impuls forms circuit [16] and also accesses sample shaping circuit [14], short-circuit protection circuit [17], charging termination control circuit [19] respectively; Described charging termination control circuit [19] also connects starter [20] and K switch respectively; Described K switch connects power supply [18].

2, charger according to claim 1, it is characterized in that, the described device ［ 7 ］ that discharges and recharges also can insert change over switch ［ 8 ］, described change over switch ［ 8 ］ connects conversion control circuit ［ 15 ］, described conversion control circuit ［ 15 ］ connects control impuls respectively and forms circuit ［ 16 ］ and multiplexer ［ 11 ］, described multiplexer ［ 11 ］ also connects test pulse respectively and forms circuit ［ 13 ］, and display ［ 12 ］, sampling shaping circuit ［ 14 ］ and control impuls form circuit ［ 16 ］.