CN201063453Y - Charger capable of improving service lifetime of accumulator - Google Patents
Charger capable of improving service lifetime of accumulator Download PDFInfo
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- CN201063453Y CN201063453Y CNU2007200367529U CN200720036752U CN201063453Y CN 201063453 Y CN201063453 Y CN 201063453Y CN U2007200367529 U CNU2007200367529 U CN U2007200367529U CN 200720036752 U CN200720036752 U CN 200720036752U CN 201063453 Y CN201063453 Y CN 201063453Y
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- operational amplifier
- sampling
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Abstract
The utility model discloses a charger capable of improving the life span of storage batteries. A circuit inside the utility model comprises a rectification component, a control component, a power component and a sampling control component which are connected in turn, wherein, the sampling control component comprises an operational amplifier and four voltage sampling resistors; a turnover current reference voltage point is gained by dividing the voltage of four voltage sampling resistors, and then is transmitted to a reversed-phase input end of the operational amplifier; an in-phase input end of the operational amplifier is a current sampling end; an output end of the operational amplifier is connected with the control component for controlling the turnover voltage point; four voltage sampling resistors is parallelly connected with a segment poking switch and a resistor, and the segment poking switch is serially connected with the resistor. The utility model prolongs the life span of the batteries of old electric bicycles by improving floating charge conversion current value; as the segment poking switch is arranged on products, floating charge conversion current can be artificially adjusted and improved; the structure of the circuit is simple to transform, and the transformation cost can be almost ignored. The utility model ensures that batteries cannot be charged under high voltage state for a long time, so as to guarantee the normal use of batteries and prolong life span.
Description
One, technical field:
The utility model relates to a kind of battery charger, a kind of specifically storage battery charger in useful life that improves.
Two, background technology:
Electric motor car particularly electric bicycle is a large amount of a kind of main walking-replacing tools that use in the present social life, existing electric motor car generally adopts lead acid accumulator, it can satisfy instructions for use and cheap substantially, but useful life is shorter, increase along with service time, the internal storage battery pole plate easily vulcanizes, and internal resistance is increased, and battery capacity descends.
Lead acid accumulator generally adopts constant current, constant voltage, and three sections charging modes of floating charge guarantee the capacity of battery charge.The new battery that has just used can satisfy and meet charging curve and the requirement as Fig. 4 fully, as seen, has the floating current transfer point of a 450-500mA between this two stages of constant voltage and floating charge among the figure.But along with the battery increase of service time, internal resistance constantly increases, and the leakage current of battery itself (being self discharge) increases, and the highlyest can progressively increase to 600mA by the 50mA when new battery is brought into use.At this moment, this floating current transfer point of the 450-500mA on Fig. 4 current curve does not just exist, because transfer point does not exist, charging voltage just can not be converted to float charge voltage.Battery just is in the high-voltage charging state all the time, and battery is because temperature raises the last battery damage of dehydration like this.
Three, utility model purpose:
The purpose of this utility model is to provide a kind of storage battery charger in useful life that improves in order to solve the prior art problem.
A kind of storage battery charger in useful life that improves described in the utility model, it comprises the charger circuit in shell and the shell, described charger circuit comprises rectification part, control assembly, power component, the sampling control assembly that connects successively; The control assembly of wherein taking a sample is controlled by reset current, it comprises an operational amplifier and four voltage sampling resistors, described four voltage sampling resistor dividing potential drops obtain reset current reference voltage point, and give the inverting input of operational amplifier, the operational amplifier in-phase input end is the current sampling end, the output of operational amplifier is connected with control assembly and is used to control the reset current point, it is characterized in that: with four voltage sampling resistor toggle switch in parallel and a resistance, this toggle switch and resistance series connection.
The operation principle of charger:
Shown in Fig. 1-2, civil power becomes 310V left and right sides smooth direct current electricity after two-way interference filter and the filtering of civil power bridge rectifier, for whole charger provides energy.The 310V direct current is the IC1-UC3842 power supply through starting resistance R3, after IC1 starts working, 6 pin output pulsed drive Q1, the interrupted conducting of Q1 makes the elementary winding N1 of high frequency transformer T1 the 310V direct current be turned to the magnetic field energy of variation, give secondary winding through electromagnetic coupler, wherein D5, CC, C8 form the high-pressure side accessory power supply, and very fast replacement start-up circuit is the IC1 power supply; Q4, C14 form the charging main power source, are battery charge.
IC1 has perfect defencive function, and its feeder ear 7 pin reach 16V and just start work, is lower than 10V and just automatically shuts down output because of under-voltage.Because there is the 34V pressurizer inside,, power supply also can guarantee internal circuit steady operation under 34V so being higher than 34V.IC1 contains inside the interior circuit of pulse-width modulation (PWM) special chip indispensabilities such as oscillator (OSC), error amplifier, pulse-width modulation (PWM), the generation of 5V reference voltage, be output as totem pillar circuit, output current can reach 1A, can directly drive the power field effect pipe (VDMOS) of vertical conductive structure.Chip carries out the electric current restriction of pulse one by one, also cries by week (phase) restriction.
The negative feedback path of output voltage stabilizing loop is mainly by voltage sampling resistor (R17, R83, R19, R18), compositions such as feedback voltage amplifier LM-324, reference power supply Q5, photoelectrical coupler PC817.The voltage stabilizing process: output voltage is owing to certain reason rising ↑ time, voltage sampling current potential OUT+ rising ↑, → through LM324 output raise ↑, → through D17 flow through the photoelectrical coupler led current increase ↑, the increase of → light intensity ↑, → photoelectrical coupler phototriode aggravation conducting, → internal resistance reduces ↓, → the 1 pin current potential of PC817 is reduced ↓, by the effect of UC3842 internal circuit, reduce the duty ratio of the PWM of 6 pin output ↓, → Q1 conducting duty ratio reduces ↓, → switching energy reduces ↓, → output voltage OUT+ reduces ↓.Otherwise, when output voltage descends ↓, → photoelectrical coupler led current of flowing through reduces ↓, → light intensity reduces thereupon ↓, → coupler phototriode conducting variation, → internal resistance increase ↑, → the 1 pin current potential of IC1 is raise ↑, by the IC1 internal action, increase the PWM duty ratio of 6 pin output ↑, → Q1 conducting duty ratio increases ↑, → switching energy increases ↑, → make output voltage OUT+ raise ↑, play the effect of automatic stabilisation output voltage.
The negative feedback path of output current limiting loop, mainly by charging current sample resistance R47, R92, R48, R49, compositions such as amplifier LM324, reference power supply, photoelectrical coupler PC817.Current stabilization and current limliting process.: charging current is owing to certain reason rising ↑ time, current sampling current potential OUT-reduction ↓, → through LM324 output raise ↑, → through D15 flow through the photoelectrical coupler led current increase ↑, the increase of → light intensity ↑, → photoelectrical coupler phototriode aggravation conducting, → internal resistance reduces ↓, → the 1 pin current potential of PC817 is reduced ↓, → by the effect of UC3842 internal circuit, reduce the PWM duty ratio of 6 pin output ↓, → Q1 conducting duty ratio reduces ↓, → switching energy reduces ↓, → output voltage OUT-reduces ↓, → charging current reduces thereupon ↓.When charging current descended owing to certain reason, process was opposite, is not giving unnecessary details.
Charge behind the battery discharge, the beginning charging current can be very big, must carry out current limliting, and current limliting essence is to reduce charging voltage.Along with the charging interval increases, charging current can progressively reduce, and charging voltage progressively raises, and as not controlling, this voltage can be higher than gassing voltage gradually, and battery can dehydration.Therefore, machine makes charger enter constant voltage trickle charge state in due course.Constant voltage trickle charge state essence is charging voltage to be fixed on be lower than gassing voltage value.Conversion opportunity charging current is again determined, common electric bicycle 12Ah sealed lead acid battery is generally selected 200 ~ 400mA, and constant voltage trickle charge state constant voltage is selected 42.5V (3 string battery pack).Switching current selects to such an extent that help battery life for a short time, and determining to be full of electricity needs the time to increase; Otherwise being full of electricity needs the time to lack, but unfavorable to battery life.The selection of constant voltage trickle charge state constant voltage value will take into account temperature, and choosing is high winter can full charge, and shortcoming is that summer can thermal runaway, and battery is filled bulge; Select low may to fill winter not enough.
The charged state change-over circuit is mainly differentiated (voltage) comparator LM324 etc. by current sampling circuit (R37, R91, R38, R39), switching current.This circuit is being seen complexity, is exactly two states in fact: one is that sample resistance under the voltage negative feedback is reduced, and output voltage is raise; One is nonintervention voltage negative feedback sample resistance ratio up and down, and output voltage is reduced and constant voltage.The course of work: charging current sampling (current potential), after filtering, send voltage comparator LM324 input, when charging current output electronegative potential during greater than 300mA, green luminous tube extinguishes.The electronegative potential of output send inverter inverting input → make to be output as high level → one side and puts azarin (charging) luminous tube → make simultaneously D16 conducting.The conducting of D16 is worked R18 and R19 parallel connection, and sample resistance reduces under the result, has changed the ratio of the sampling → OUT+ rising up and down of voltage negative feedback, and charger is in the high-voltage great-current limited current state.When charging current during less than 300mA, upset output high potential → light green (trickle) luminous tube.The high potential of output is anti-phase through LM324, is output as low level → red (charging) luminous tube and extinguishes, and D16 is ended.D16 ends, and makes the R3 open circuit no longer influence the sample resistance → OUT+ reduction up and down of voltage negative feedback, and charger is in lower constant voltage charge state.Need to prove, integrated package LM324, it both can dual power supply also can single power supply, the single power supply that this charger is, voltage comparator.
3) debugging
A. the debugging of constant voltage trickle charge state constant voltage value.Make the charger zero load, with voltage between digital voltmeter monitoring VB point and the ground.Suppose that battery gassing voltage selects 42.5V, add that D8 pressure drop VB should be 43.5V.Change R17 and can change this voltage, increase the R17 resistance, OUT+ raises; Reduce the R17 resistance, OUT+ reduces.
B. the debugging of charged state current conversion point.Survey LM324-9 pin voltage.Descending adjustment resistance, when the ammeter indicated value was elevated to switching motion value 300mA, the LM324-8 pin should be exported high potential (near 17V); Increase resistance, when charging current during less than 300mA, the LM324-8 pin should be exported electronegative potential (being 0V).Change R39 and can change this switching motion value.Practical operation is cumbersome, and this adjustment can not be done in general maintenance.
The utility model has increased a toggle switch and a resistance in the sampling control assembly, in parallel with four voltage sampling resistors again after this toggle switch and the resistance series connection.
When toggle switch was closed, the datum mark current potential was constant, and the electric current of constant voltage section when the floating charge section transforms remains the 450-500mA of standard charging device regulation; This moment, it was applied in the use of new battery.After battery uses a period of time, no matter find that the charging interval prolongs when how long battery always is not fully filled, toggle switch is disconnected off resistance R
50Can make the datum mark current potential rise, by operational amplifier the floating current transfer point between this two stages of constant voltage and floating charge is risen, make it increase and surpass the highest possible 600mA of leakage current and the 750-800mA that arrives from 450-500mA of standard, so can make the storage battery after the long-term use still can finish of the conversion of constant voltage section, realize charging normally to the floating charge section.
The utility model adopts and improves the life-span that floating charge switching current value prolongs old battery of electric bicycle, it is provided with toggle switch in product design, adjustment that can be artificial improves the floating charge switching current, the transformation of circuit structure is simple, and improvement cost almost can be ignored.It can not charge battery for a long time under high pressure conditions, guaranteed its normal use, has prolonged the life-span.Its charging voltage-current curve as shown in Figure 5.
Four, description of drawings:
Fig. 1 is the utility model schematic diagram;
Fig. 2 is the charger circuit figure before improving;
Fig. 3 is a circuit diagram of the present utility model;
Fig. 4 is the charging voltage-current curve diagram of charger before improving;
Fig. 5 is the charging voltage-current curve diagram of the utility model charger.
Five, embodiment
As shown in figures 1 and 3, a kind of storage battery charger in useful life that improves described in the utility model, it comprises the charger circuit in shell and the shell, wherein charger circuit comprises upset rectification part, control assembly, power component, sampling control assembly; Described sampling control assembly is controlled by reset current, the sampling control assembly comprises an operational amplifier and four voltage sampling resistor R91, R37, R38, R39, obtain reset current reference voltage point after described four voltage sampling resistor dividing potential drops, and give operational amplifier LM324-9 pin inverting input; Operational amplifier LM324-10 pin in-phase input end is the current sampling end; Operational amplifier LM324-8 pin is that amplifier output is connected with control assembly and is used to control the reset current point; Improvements are and four voltage sampling resistor toggle switch KK in parallel and a resistance R
50, this toggle switch K and resistance R
50Series connection.
When toggle switch KK was closed, the datum mark current potential was constant, and the electric current of constant voltage section when the floating charge section transforms remains 450-500mA; After battery uses a period of time, no matter find that the charging interval prolongs when how long battery always is not fully filled, toggle switch KK is disconnected, can make the datum mark current potential rise, by operational amplifier the floating current transfer point between this two stages of constant voltage and floating charge is risen, make its increase and surpass the highest possible 600mA of leakage current and the 750-800mA that arrives, so can make the storage battery after the long-term use still can finish of the conversion of constant voltage section, realize charging normally to the floating charge section.
Claims (1)
1. one kind can be improved the storage battery charger in useful life, and it comprises the charger circuit in shell and the shell, and described charger circuit comprises rectification part, control assembly, power component, the sampling control assembly that connects successively; The control assembly of wherein taking a sample is controlled by reset current, it comprises an operational amplifier and four voltage sampling resistors (R91, R37, R38, R39), described four voltage sampling resistor dividing potential drops obtain reset current reference voltage point, and give the inverting input (LM324-9) of operational amplifier, operational amplifier in-phase input end (LM324-10) is the current sampling end, the output of operational amplifier (LM324-8) is connected with control assembly and is used to control the reset current point, it is characterized in that: with four voltage sampling resistor toggle switch in parallel (KK) and a resistance (R
50), this toggle switch (KK) and resistance (R
50) series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200367529U CN201063453Y (en) | 2007-04-26 | 2007-04-26 | Charger capable of improving service lifetime of accumulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200367529U CN201063453Y (en) | 2007-04-26 | 2007-04-26 | Charger capable of improving service lifetime of accumulator |
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| Publication Number | Publication Date |
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| CN201063453Y true CN201063453Y (en) | 2008-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007200367529U Expired - Fee Related CN201063453Y (en) | 2007-04-26 | 2007-04-26 | Charger capable of improving service lifetime of accumulator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447293A (en) * | 2010-10-15 | 2012-05-09 | 南京龙灵机械贸易有限公司 | Farad capacitance charger |
| CN107332308A (en) * | 2017-07-18 | 2017-11-07 | 深圳市华星光电半导体显示技术有限公司 | Charging turns circuit for lamp |
| CN109617201A (en) * | 2018-12-29 | 2019-04-12 | 厦门市科力电子有限公司 | Novel battery charger circuit |
-
2007
- 2007-04-26 CN CNU2007200367529U patent/CN201063453Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447293A (en) * | 2010-10-15 | 2012-05-09 | 南京龙灵机械贸易有限公司 | Farad capacitance charger |
| CN107332308A (en) * | 2017-07-18 | 2017-11-07 | 深圳市华星光电半导体显示技术有限公司 | Charging turns circuit for lamp |
| CN109617201A (en) * | 2018-12-29 | 2019-04-12 | 厦门市科力电子有限公司 | Novel battery charger circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080521 Termination date: 20110426 |