CN2161012Y - Automatic charger for precision nickel-cadmium cell - Google Patents

Automatic charger for precision nickel-cadmium cell Download PDF

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Publication number
CN2161012Y
CN2161012Y CN 93233068 CN93233068U CN2161012Y CN 2161012 Y CN2161012 Y CN 2161012Y CN 93233068 CN93233068 CN 93233068 CN 93233068 U CN93233068 U CN 93233068U CN 2161012 Y CN2161012 Y CN 2161012Y
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China
Prior art keywords
circuit
voltage
charging
voltage comparator
capacity
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Expired - Fee Related
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CN 93233068
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Chinese (zh)
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欧成喜
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Individual
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Individual
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Abstract

The utility model relates to an accurate nickel cadmium battery automatic charger, including power, voltage reference generating circuit, constant current circuit, state detection-control circuit, capacity display circuit and charging execution circuit. It adopts multi-terminal integrated voltage comparator with fast response speed, small driving current and high precision to replace transistor as state detection control element and DC contactless switch device with long service life and reliability as charging executing element. The charger overcomes the phenomena of voltage drift, large return difference and low reliability caused by the influence of temperature of the conventional charger, and has the charging capacity error less than 1 percent and the functions of battery maintenance charging and capacity percentage display. High precision and good reliability, and can greatly prolong the continuous service life of the nickel-cadmium battery.

Description

Automatic charger for precision nickel-cadmium cell
The utility model relates to a kind of charging device, particularly a kind of accurate nickel-cadmium cell automatic charger.
Battery charge is to realize the necessary means of conventional energy resource transfer, conversion, storage, and the technological means of dissimilar batteries being implemented charging is different.The utility model is the improvement project at big capacity Ni-Cd battery charger commonly used.The technological deficiency that existing charger exists comprises: the one, and its automatic outage control element is realized by transistor switch, because the influence that the transistor emitter junction is subjected to ambient temperature big (temperature coefficient-2.5 millivolt/℃), the operating ambient temperature of charger itself higher (generally about 30-70 ℃) in addition, thus the bigger drift of automatic outage voltage caused.Cause when charging finishes, the actual charging capacity of battery does not reach nominal capacity.The 2nd, can not realize the battery maintenance charging, after general nickel-cadmium cell charging finishes, there are the nature electric discharge phenomena, capacity is descended, influence is used.Under the temperature of 20C, with the speed self discharge of every day 1%, high temperature is very next.Because the characteristics of transistor curve is more smooth, its return difference is bigger, when cell voltage descends when a lot, still can't the battery makeup energy not had battery maintenance charging effect.The 3rd, no capacity Presentation Function because the nickel-cadmium cell charging process is longer, can not show the state degree of charging exactly.The 4th, the employing mechanical relay is an executive component, because the existence of contact oxidation effect, actual life and reliability can not get effective assurance, also because the mechanical relay return difference is big, discharge TV university and be about 50% of operating voltage, can not realize battery maintenance charging effect.
Task of the present utility model makes improvements at above-mentioned deficiency exactly, a kind of new circuit design scheme is proposed, a kind of high accuracy self check is provided and controls the circuit that cuts off the power supply automatically, overcome defective because of inaccurate " undercharge " that causes of precision control, realize additional maintenance charging simultaneously, keep the normal capacity of battery the nickel-cadmium cell self discharge.In charging process, increased the photoelectricity prompt facility of charged state degree.Replace mechanical relay with direct current noncontacting switch device, improve the reliability and the useful life of charger.
Task of the present utility model realizes that in the following manner it comprises power supply, voltage reference generation circuit, constant-current circuit, state-detection one control circuit, capacity display circuit, charging executive circuit six parts composition.Voltage reference generation circuit adopts adjustable three terminal integrated voltage stabilizer LM317 that voltage reference is provided, and supply condition detection-control circuit and capacity display circuit be voltage as a comparison.Adopt constant current charge, provide charging current by constant-current circuit.State-detection-control circuit adopts multiterminal integrated voltage comparator LM339 to replace transistor as the state-detection control element.The capacity display circuit is according to the corresponding relation (see attached list) of battery capacity with when charging battery terminal voltage, adopt light-emitting diode to carry out the percentages show of capacity status degree, the charging executive circuit adopts solid-state relay SSR or transistor electronic switch to replace mechanical relay as executive component, carries out sensitivity and reliability to improve it.
Below in conjunction with drawings and Examples the utility model is elaborated.
Accompanying drawing 1 is a structure composition frame chart of the present utility model.
Accompanying drawing 2 is circuit theory diagrams of the present utility model.
As accompanying drawing 2, in the composition of the present utility model, constant-current circuit is by IC1, and resistance R 1 is formed, and voltage reference generation circuit is by IC2, and resistance R 2, R3 form, and it provides a reference voltage V G to the H point, regulates resistance R 3, can change the size of reference voltage value VG.IC1-IC2 selects three terminal integrated voltage stabilizer LM317 for use, and LED1 is the power supply indication.Resistance string R5-R8 is the battery components piezoresistance, can obtain the comparative voltage VB of battery pack charging status degree by the K point.State-detection-control circuit is selected multiterminal integrated voltage comparator LM339 for use, and this integrated circuit includes four voltage comparators, response speed is fast, the transistor difference channel has been adopted in inside, because the strict symmetry of circuit has been eliminated the influence of temperature to switching levels.During state-detection of the present utility model-control circuit is formed, resistance R 13-R20 is the biasing resistor of voltage comparator, the output (H point) of two biasing resistor series connection back one termination voltage benchmark generation circuit of each voltage comparator, other end ground connection, the node of two biasing resistors connects the in-phase end (+) of voltage comparator, the end of oppisite phase (-) of each voltage comparator connects and is compared voltage output end (K point), the capacity display circuit is made up of current-limiting resistance R9-R12 and LED 2-LED5 respectively, a termination H point of resistance after current-limiting resistance is connected with light-emitting diode, the negative terminal of light-emitting diode connects the output of voltage comparator.The charging executive circuit is made up of resistance R 21, R22, triode BG1, solid-state relay SSR.Solid-state relay is the noncontacting switch device, long service life, and drive current is little, and it is sensitive to turn on and off action reflection, and good reliability has overcome that mechanical relay sensitivity is low, poor reliability, deficiency that return difference is big.Resistance R 21 connects the base stage of triode BG1, and the output of another termination voltage comparator connects power supply ground behind the BG1 collector electrode crosstalk resistance R22, and the input of solid-state relay SSR is connected to collector electrode and the emitter of BG1.Also can replace solid-state relay SSR with the transistor electronic switch.
Operation principle of the present utility model: as shown in Figure 2,220 volts AC power, through transformation, rectification, become low-voltage DC after the filtering, SSR obtains voltage and is in " leading to " state, carry out constant current charge through constant-current circuit to battery pack this moment, provide a reference voltage V G through voltage reference generation circuit at the H point, produce four comparative voltage V1 by divider resistance R13-R20 again, V2, V3, V4 is compared voltage VB by what the K point was obtained the battery pack charging status degree, when VB≤V4, voltage comparator oppositely ends, output does not have current potential, and charged state is kept in not conducting of BG1.When VB>V4, voltage comparator overturns rapidly, output signal, BG1 obtains base current and conducting through R21, and the input of SSR is turn-offed rapidly by short circuit, and charging finishes, owing to adopted difference channel in the voltage comparator, as long as it is constant to be compared voltage, its voltage that cuts off the power supply automatically is also constant, thereby has eliminated the influence of temperature to automatic outage voltage.Make the control precision error less than 1%.
The process of maintenance charging is repeatedly carrying out repeatedly of charging process, the battery of just having substituted the bad for the good is because the effect of self discharge, terminal voltage can descend, when battery terminal voltage is lower than V4, then control circuit overturns rapidly, make executive circuit be in " leading to " state, to the battery makeup energy, when returning to nominal voltage till.
The capacity procedure for displaying: the corresponding relation of battery terminal voltage is as follows when the battery capacity of charged state degree prompting institute foundation and charging:
Charge capacity 25% 50% 75% 100%
The terminal voltage of charging 1.35-1.39 1.39-1.42 1.42-1.45 1.45-1.48
Setting voltage comparator 1-4 as shown in Figure 2, four class when being respectively applied for detection and showing the 25%-100% capacity, the display voltage of each voltage comparator correspondence can be obtained by the biasing resistor of in-phase end, when the terminal voltage when charging meets or exceeds the display voltage of this class, voltage comparator is in " leading to " state, and a corresponding light-emitting diode is lighted.Along with the continuation of charging process, from the low capacity to the high power capacity, lighted successively, till when prompting 100% capacity charged state finishes.
Advantage of the present utility model and effect show: charging precision height, and voltage error is less than 1%, and the self discharge that has had concurrently simultaneously battery provides the maintenance charge function, can improve the continuous service life of nickel-cadmium cell, has increased and has filled Battery capacity luminescence prompting function in the electric process is convenient to the level of charge that is recharged the pond of understanding directly perceived. Adopt the noncontacting switch device, further improved the control accuracy of charger and its reliability is very significantly improved.

Claims (4)

1, a kind of accurate nickel-cadmium cell automatic charger, form by power supply, voltage reference generation circuit, constant-current circuit and charging executive circuit, it is characterized in that: state-detection-control circuit adopts multiterminal integrated voltage comparator LM339 as the state-detection control actuating component, and it is executive component that the charging executive circuit adopts solid-state relay SSR or transistor electronic switch.
2, automatic charger according to claim 1, it is characterized in that: the output (H point) of two biasing resistors series connection back, the one termination voltage benchmark generation circuit of each voltage comparator, other end ground connection, the end of oppisite phase of each voltage comparator () connect the output (K point) that is compared voltage.
3, automatic charger according to claim 1 is characterized in that: a termination H point of resistance after the current-limiting resistance of capacity display circuit is connected with light-emitting diode, the negative terminal of light-emitting diode connects the output of voltage comparator.
4, automatic charger according to claim 1, it is characterized in that: the resistance R 21 of charging executive circuit connects the base stage of triode BG1, the output of another termination voltage comparator, connect power supply ground behind the BG1 collector series resistance R22, the input of solid-state relay SSR is connected to collector electrode and the emitter of BG1.
CN 93233068 1993-01-10 1993-01-10 Automatic charger for precision nickel-cadmium cell Expired - Fee Related CN2161012Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 93233068 CN2161012Y (en) 1993-01-10 1993-01-10 Automatic charger for precision nickel-cadmium cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 93233068 CN2161012Y (en) 1993-01-10 1993-01-10 Automatic charger for precision nickel-cadmium cell

Publications (1)

Publication Number Publication Date
CN2161012Y true CN2161012Y (en) 1994-04-06

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Application Number Title Priority Date Filing Date
CN 93233068 Expired - Fee Related CN2161012Y (en) 1993-01-10 1993-01-10 Automatic charger for precision nickel-cadmium cell

Country Status (1)

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CN (1) CN2161012Y (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005122358A1 (en) * 2004-06-10 2005-12-22 Yiping Sun A multifunctional battery charger
CN100386943C (en) * 2004-09-15 2008-05-07 上海米廷电子科技有限公司 Solar energy charging type multifunction lighting device
CN103969490A (en) * 2013-01-29 2014-08-06 海洋王(东莞)照明科技有限公司 Charging indicating circuit and storage battery charging device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005122358A1 (en) * 2004-06-10 2005-12-22 Yiping Sun A multifunctional battery charger
CN100369353C (en) * 2004-06-10 2008-02-13 孙逸平 Charger for cell
CN100386943C (en) * 2004-09-15 2008-05-07 上海米廷电子科技有限公司 Solar energy charging type multifunction lighting device
CN103969490A (en) * 2013-01-29 2014-08-06 海洋王(东莞)照明科技有限公司 Charging indicating circuit and storage battery charging device
CN103969490B (en) * 2013-01-29 2016-09-28 海洋王(东莞)照明科技有限公司 A kind of charging indication and battery charging plant

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C19 Lapse of patent right due to non-payment of the annual fee
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