CN206894279U - A kind of constant-current charging circuit and accumulation power supply - Google Patents
A kind of constant-current charging circuit and accumulation power supply Download PDFInfo
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- CN206894279U CN206894279U CN201720544010.0U CN201720544010U CN206894279U CN 206894279 U CN206894279 U CN 206894279U CN 201720544010 U CN201720544010 U CN 201720544010U CN 206894279 U CN206894279 U CN 206894279U
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Abstract
The utility model discloses a kind of constant-current charging circuit and accumulation power supply, constant-current charging circuit includes constant pressure driving chip and current feedback circuit；(1) voltage output end of constant pressure driving chip is the positive output end VOUT+ of constant-current charging circuit；The negative output terminal ground connection of constant pressure driving chip；Constant pressure driving chip is powered by DC-voltage supply end VIN+ and VIN；(2) current feedback circuit described in includes resistance R1, R2 and R5 and reference voltage end VREF+；Reference voltage end VREF+ is grounded by resistance R1, R2 and the R5 being sequentially connected in series；Resistance R5 and R2 tie point are the negative output terminal VOUT of constant-current charging circuit；Resistance R1 and R2 tie point meet the feedback end FB of constant pressure driving chip.The constant-current charging circuit is easy to implement, and flexibility is good, and stability is good, and cost is low.
Description
Technical field
It the utility model is related to a kind of constant-current charging circuit and accumulation power supply.
Background technology
The charging of present lithium battery, due to needing the constant-current charge of constant-current charge, particularly high current, it there is no specially
IC can be gone to realize, the charging of lithium battery is realized now with three kinds of methods：
A. special constant-current IC schemes are used.
B. constant pressure IC adds the solution of amplifier.
C. the sample resistance of Voltage Feedback and current sampling resistor series process.
A. there is following several shortcomings in special constant-current IC schemes：
1. cost is high, general output 2A IC price is more than 3 yuan.
2. voltage and current parameter is restricted, very little, washability is too poor, and substitutability is almost nil by the IC that can be selected.
B. constant pressure IC adds the scheme of amplifier：
1. cost is higher, general one common amplifier IC needs 0.6 yuan or so, along with the cost meeting of other peripheral cells
Increase is at 1 yuan or so.
2. complex circuit, the stability of circuit control ring is poor.
C. the sample resistance of Voltage Feedback and current sampling resistor series process.
1. control characteristic is poor, when load excursion is big, output current can not accomplish constant current.
2. stability is poor, electric current output changes with the change of output voltage.
Therefore, it is necessary to design a kind of new constant-current charging circuit and constant-current charge method.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of constant-current charging circuit and accumulation power supply, and the constant current is filled
Circuit is easy to implement, and flexibility is good, and stability is good, and cost is low.
The technical solution of utility model is as follows：
A kind of constant-current charging circuit, including constant pressure driving chip and current feedback circuit；
(1) voltage output end of constant pressure driving chip is the positive output end VOUT+ of constant-current charging circuit；Constant pressure driving chip
Negative output terminal ground connection；
Constant pressure driving chip is powered by DC-voltage supply end VIN+ and VIN-；
(2) current feedback circuit described in includes resistance R1, R2 and R5 and reference voltage end VREF+；
Reference voltage end VREF+ is grounded by resistance R1, R2 and the R5 being sequentially connected in series；
Resistance R5 and R2 tie point are the negative output terminal VOUT- of constant-current charging circuit；
Resistance R1 and R2 tie point meet the feedback end FB of constant pressure driving chip.
Described constant-current charging circuit also includes voltage feedback circuit；
Voltage feedback circuit includes resistance R3 and R4 and diode D1；
Resistance R3 and R4 series connection are followed by between the positive output end VOUT+ and ground of constant-current charging circuit；Resistance R3's and R4
Tie point connects diode D1 anode；Diode D1 negative electrode meets the feedback end FB of constant pressure driving chip.
Bridging has electric capacity C2 between the positive output end VOUT+ and negative input end of constant-current charging circuit.
Bridging has electric capacity C1 between DC-voltage supply end VIN+ and VIN-.
Bridging has electric capacity C3 between feedback end FB and ground.
Reference voltage end VREF+ provides 2.5V reference voltages.
Described constant pressure driving chip uses ZTP7192 devices.It can also be in the market others constant pressure driving chip.Such as
MP1495, MP1593, RT8296, MC34063, FP5138 ... ....
A kind of accumulation power supply, including energy-storage module and the constant-current charging circuit for energy-storage module charging；Described constant current is filled
Circuit uses foregoing constant-current charging circuit.
Described energy-storage module is lithium battery or super capacitor.
Constant current principle of the present utility model is to realize that constant current drives by constant pressure driving chip and current feedback electric current；
Overvoltage protection is realized in addition, being combined using voltage feedback circuit with constant pressure driving chip；
Energy-storage module is lithium battery group or super capacitor group.(battery pack refers to multiple battery series connection, and super capacitor group refers to
Connected again after multiple super capacitor parallel connections).
The utility model is formed current feedback ring and is gone control voltage together using a reference power source partial pressure and sample resistance
The mode of feedback goes to realize the constant current of electric current, and this method is referred to as reference voltage constant flow method.
Beneficial effect：
Constant-current charging circuit and accumulation power supply of the present utility model, it is a kind of brand-new constant current implementation.Its core is
Constant current is realized by using constant pressure chip.Moreover, the size of output current can flexibly be set, flexibility is good.Than original use
Constant current chip application effect is good.Practice have shown that charging circuit control effect of the present utility model protrudes, cost significantly reduces.
Brief description of the drawings
Fig. 1 is the schematic diagram of constant-current charging circuit.
Fig. 2 is concrete application scene figure.
Embodiment
The utility model is described in further details below with reference to the drawings and specific embodiments：
Embodiment 1：Such as Fig. 1 schematic diagram, each element or label declaration：
VIN+----- input power positive poles.
VIN------ input power negative poles.
VOUT+----- out-put supply positive poles.
VOUT----- out-put supply negative poles.
The positive pole of VREF+----- reference power sources.
C1 is input filter capacitor.
C2 is output filter capacitor.
C3 is current sample feedback filtering.
R1, R2, R5, C3 form current sample feedback line.
R3, R4, it is voltage sample feedback circuit.
D1 is isolation diode.
Operation principle explanation：
Using stable reference power supply as reference voltage, using R1, R2, R5 partial pressures obtain the voltage equal with FB, so as to
Remove to adjust DCDC IC inside PWM by FB to control the size of output current.For example, working as output current becomes big, in sampling electricity
Voltage on resistance R5 will raise, and because VRFE+ is fixed value, so as to be that FB voltages become big, FB becomes big, and dutycycle will subtract
It is few, so as to be that output current is reduced, and a complete feedback is completed, reach the purpose of stabling current output.
Constant current calculates：
If voltage caused by the overcurrent of R5 upstream is VIo, output current Io,
Reference voltage is VREF+=2.5V,
FB voltages are VFB=0.6V,
R5=0.1 Ω, R1=40K Ω, R2=10K Ω,
Then：
VIo=Io*R5
VFB=VIo+ ((VREF+-VIo) * R2/ (R1+R2))
Calculate：
Io=(VFB* (R1+R2)-R2*VREF+)/R1*R5
The equation if K=(VFB* (R1+R2)-R2*VREF+)/R1 is taken
Io=K/R5
In terms of calculation formula, Io output currents and output voltage and input voltage do not have any relation, only and VFB.R1,
R2, VREF are relevant, and these parameters are in specific design, they be all it is fixed (VFB be in stable state it is fixed, for
Chip fp7192 constant pressure chips, its steady-state value are 0.6v), so K is necessarily a fixed value, so formula：
Io=K/R5 has the fabulous linearity, and has excellent controllability.
Parameter above being assigned the occurrence being set above can obtain：
Io=(VFB* (R1+R2)-R2*VREF+)/R1*R5
=(0.6* (40+10) -10*2.5)/40*0.1
=1.25A
Constant pressure chip.About 0.8 yuan of cost.
It can be seen that, this scheme introduces fixed VREF+ in equation more than, is only taken so that Io becomes one with R5
The linear equation of sample resistance, makes Io become constant, so as to reach the purpose of constant current.
The characteristics of this programme reference voltage constant flow method, is as follows：
1. use stable control and the stability control fixed VREF+ voltages, be easy to precision.
Fed back 2. current sample is become electric resistance partial pressure by use, it is more simple and reliable.
3. applicability is wide, the circuit of any required constant current can use.
4. cost is greatly reduced, such as does 12V/1A outputs using IC constant current schemes and wants more than 3 yuan, and is existed using this programme
Within 1 yuan.
Claims (10)
1. a kind of constant-current charging circuit, it is characterised in that including constant pressure driving chip and current feedback circuit；
(1) voltage output end of constant pressure driving chip is the positive output end VOUT+ of constant-current charging circuit；Constant pressure driving chip is born
Output head grounding；
Constant pressure driving chip is powered by DC-voltage supply end VIN+ and VIN-；
(2) current feedback circuit described in includes resistance R1, R2 and R5 and reference voltage end VREF+；
Reference voltage end VREF+ is grounded by resistance R1, R2 and the R5 being sequentially connected in series；
Resistance R5 and R2 tie point are the negative output terminal VOUT- of constant-current charging circuit；
Resistance R1 and R2 tie point meet the feedback end FB of constant pressure driving chip.
2. constant-current charging circuit according to claim 1, it is characterised in that also including voltage feedback circuit；
Voltage feedback circuit includes resistance R3 and R4 and diode D1；
Resistance R3 and R4 series connection are followed by between the positive output end VOUT+ and ground of constant-current charging circuit；Resistance R3 and R4 connection
Point connects diode D1 anode；Diode D1 negative electrode meets the feedback end FB of constant pressure driving chip.
3. constant-current charging circuit according to claim 1, it is characterised in that in the positive output end VOUT of constant-current charging circuit
+ between negative input end bridging have electric capacity C2.
4. constant-current charging circuit according to claim 1, it is characterised in that DC-voltage supply end VIN+ and VIN- it
Span is connected to electric capacity C1.
5. constant-current charging circuit according to claim 1, it is characterised in that bridging has electric capacity between feedback end FB and ground
C3。
6. constant-current charging circuit according to claim 1, it is characterised in that reference voltage end VREF+ provides 2.5V benchmark
Voltage.
7. according to the constant-current charging circuit described in claim any one of 1-6, it is characterised in that described constant pressure driving chip is adopted
With ZTP7192 devices.
A kind of 8. accumulation power supply, it is characterised in that the constant-current charging circuit including energy-storage module and for energy-storage module charging；It is described
Constant-current charging circuit using the constant-current charging circuit described in claim any one of 1-6.
9. accumulation power supply according to claim 8, it is characterised in that described energy-storage module is lithium battery or super electricity
Hold.
10. accumulation power supply according to claim 8, it is characterised in that energy-storage module is lithium battery group or super capacitor group.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720544010.0U CN206894279U (en) | 2017-05-16 | 2017-05-16 | A kind of constant-current charging circuit and accumulation power supply |
| US15/880,468 US10978882B2 (en) | 2017-05-16 | 2018-01-25 | Constant-current charging circuit, energy storage power source and constant-current charging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720544010.0U CN206894279U (en) | 2017-05-16 | 2017-05-16 | A kind of constant-current charging circuit and accumulation power supply |
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| Publication Number | Publication Date |
|---|---|
| CN206894279U true CN206894279U (en) | 2018-01-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953393A (en) * | 2017-05-16 | 2017-07-14 | 东莞市巨星电池有限公司 | A kind of constant-current charging circuit, accumulation power supply and constant-current charge method |
-
2017
- 2017-05-16 CN CN201720544010.0U patent/CN206894279U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953393A (en) * | 2017-05-16 | 2017-07-14 | 东莞市巨星电池有限公司 | A kind of constant-current charging circuit, accumulation power supply and constant-current charge method |
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| CP01 | Change in the name or title of a patent holder |
Address after: 523718 3 building, 1 A Industrial Park, Keyuan Road, Tangxia Town, Dongguan, Guangdong. Patentee after: Guangdong Electric General Energy Co., Ltd. Address before: 523718 3 building, 1 A Industrial Park, Keyuan Road, Tangxia Town, Dongguan, Guangdong. Patentee before: DONGGUAN JUXING POWER CO., LTD. |