CN207442474U - A kind of parallel cells charging circuit - Google Patents
A kind of parallel cells charging circuit Download PDFInfo
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- CN207442474U CN207442474U CN201721106948.0U CN201721106948U CN207442474U CN 207442474 U CN207442474 U CN 207442474U CN 201721106948 U CN201721106948 U CN 201721106948U CN 207442474 U CN207442474 U CN 207442474U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model provides a kind of parallel cells charging circuit, and the charging circuit includes：One voltage conversion circuit, voltage detecting circuit, a feedback voltage selection circuit and N number of charging current control circuit, a difference backfeed loop is formed by converting the voltage into circuit, voltage detecting circuit and feedback voltage selection circuit, output voltage is adjusted according to worst error result, so that the pressure difference between output voltage cell voltage corresponding with the worst error result is setting pressure difference, realizes and started to charge up from the minimum battery of voltage；Simultaneously by configuring a charging current control circuit for each section parallel cells, the charging current of rechargeable battery is controlled, charging current is made to be equal to setting electric current value, realizes constant-current charge, accurately to control the charging current for often saving rechargeable battery.By parallel cells charging circuit provided by the utility model, solving the problems, such as available circuit, there are battery-heating is serious, charge efficiency is low, occupied space is big and of high cost.
Description
Technical field
The utility model is related to battery boosting technology, more particularly to a kind of parallel cells charging circuit.
Background technology
As the function of the portable charging apparatus such as mobile phone is stronger and stronger, the power consumption of portable device is also increasing,
And the consumption of customer experience formula also just determines that the battery capacity of portable device is increasing；But due to battery material performance boost
It is difficult to meet the requirement of high capacity cell with getting instant result, therefore, how to realize that big battery capacity and high charge speed are present
Portable device occupies the key of catbird seat in consumption market.
Fig. 1 is the first existing charging modes, after 1 voltage stabilizing of voltage conversion front end output, connects a charge management circuit
2, it realizes and charges to multiple parallel cells 3.Such charging modes there are the drawbacks of be：Even if selection is very when dispatching from the factory
Approximate voltage and the battery of internal resistance carry out parallel connection, but after tens of or even hundreds of secondary cycle charge-discharges, multiple electricity in parallel
The internal resistance in pond is no longer consistent, and also it is difficult to predict when such as dispatching from the factory in battery due to the increased concrete numerical value of the internal resistance of cell
50 milliohms are hindered, after two years after hundreds of secondary charge and discharge/fevers normal circulations such as to the cold, especially after cell degradation, some batteries
Internal resistance rises to nearly 200 milliohm or bigger, some batteries then rise unobvious, and only to 60 milliohms, but user can not examine completely
Feel.
If charging at this time to multiple parallel batteries, the electric current distribution of charging generates very large deviation when will be with dispatching from the factory.
When dispatching from the factory, since the internal resistance of multiple parallel cells is close, charging current is often made to divide equally (such as current prevalence between multiple batteries
Fast charge 5A, two save each simple charged in parallel of 2500 milliampere hour battery when dispatching from the factory, and capacity reaches 5000 milliampere hour after cell parallel, fills
Each 2.5A of electric current carries out 1C chargings, and it is to have no problem that when dispatching from the factory, the battery core of selection 1C, which makees battery).But work as the interior of battery
After resistance changes, the charging current of each battery will not remake respectively, for the small battery of internal resistance, in directly parallel charging
Distribute larger current；If internal resistance becomes to differ greatly, most charging currents can be caused all to flow to the small battery of internal resistance, led
Cause the battery-heating abnormal so that it (is all 50 milliohms when the internal resistance of such as battery is dispatched from the factory originally, through repeatedly to charge there are security risk
After aging, the internal resistance of battery becomes 60 milliohms and 200 milliohms respectively, and the charging current of battery will become between two batteries
5A*200/ (200+60)=3.85A and 5A*60/ (200+60)=1.15A, the charging current of battery is with (being all 2.5A when dispatching from the factory
Comparison) comparison, variation is very greatly (becoming 3.85A and 1.15A respectively)；For the 2500 milliampere hour battery cores of 1C, charge
3.85A, charging current is much larger than normal value (being 1.5 times of normal value), beyond the load rated safety charging current scope of battery.
Fig. 2 is existing second of charging modes, and using same voltage conversion front end 1, but each battery 3 has oneself solely
After voltage conversion front end voltage stabilizing output, each battery is given by an independent charge management circuit for vertical charge management circuit 2
Carry out charge independence.But due to there is no any feedback, voltage conversion front end between charge management circuit and voltage conversion front end
Output voltage and each cell voltage pressure difference it is larger, cause battery charge efficiency very low, be not suitable for large current charge, otherwise can
Fever is serious.
Fig. 3 is the third existing charging modes, is asked to solve fever existing for second of charging modes and inefficient
Each battery 3 is set independent 1 and one charge management circuit 2 of voltage conversion front end, the battery is carried out with realizing by topic
It charges.Although such charging modes can solve the problems, such as that first, second kind of mode exists, due to each battery have it is independent
Voltage conversion front end, therefore multiple independent voltage conversion front-end circuits and corresponding component are also just needed, and then cause to account for
With space it is big the problem of, for interior of mobile phone space at full stretch, this be undoubtedly sacrifices battery space or hand
Machine size, while also correspondingly increase cost.
In consideration of it, it is necessary to design a kind of new parallel cells charging circuit to solve above-mentioned technical problem.
Utility model content
In view of the foregoing deficiencies of prior art, charge the purpose of this utility model is to provide a kind of parallel cells electric
Road, for solving the problems, such as existing charging circuit, there are battery-heating is serious, charge efficiency is low, occupied space is big and of high cost.
In order to achieve the above objects and other related objects, the utility model provides a kind of parallel cells charging circuit, described
Charging circuit includes：
One voltage conversion circuit, the worst error for being exported according to feedback voltage selection circuit export electricity as a result, adjusting
Pressure so that the pressure difference between output voltage cell voltage corresponding with the worst error result is setting pressure difference, into
And it realizes and is started to charge up from the minimum battery of voltage；
One voltage detecting circuit, respectively the anode with the output terminal of the voltage conversion circuit and N batteries be connected, be used for
Sample the cell voltage of N batteries, and according to the setting pressure difference, to the output voltage and N number of cell voltage respectively into
Row error-detecting generates N number of error result and exports；
One feedback voltage selection circuit, input terminal are connected respectively with the voltage detecting circuit, output terminal with it is described
Voltage conversion circuit connects, and N number of error result for the voltage detecting circuit to be exported is compared, and by maximum
Error result is exported；
N number of charging current control circuit, output terminal of each charging current control circuit with the voltage conversion circuit
And one battery anode connection, sampled for the cell voltage to rechargeable battery or battery current, and by the battery electricity
Pressure or battery current carry out error-detecting with setting pressure difference or setting electric current value, and then adjust the charging electricity of the rechargeable battery
Stream makes the charging current be equal to setting electric current value, realizes constant-current charge；
Wherein, N is the integer more than or equal to 2.
Preferably, the voltage conversion circuit includes：
Pulse-width modulation circuit is connected with the feedback voltage selection circuit, for according to the feedback voltage selection circuit
The worst error of output is as a result, adjust the duty cycle of the output signal of the pulse-width modulation circuit；And
Output voltage regulation circuit is connected with the pulse-width modulation circuit, for according to the defeated of the pulse-width modulation circuit
Go out output voltage described in Signal Regulation so that between output voltage cell voltage corresponding with the worst error result
Pressure difference is setting pressure difference.
Preferably, the pulse-width modulation circuit includes：First error amplifier, the first of first error amplifier are defeated
Enter end to be connected with reference voltage, the output of the second input terminal of first error amplifier and the feedback voltage selection circuit
End connection, the output terminal of first error amplifier and the first input end of first comparator connect, the first comparator
The second input terminal be connected with ramp generator, the input terminal of the output terminal of the first comparator and pulse width modulator connects,
Output terminal of the output terminal of the pulse width modulator as the pulse-width modulation circuit.
Preferably, the output voltage regulation circuit includes：Driving circuit, the input terminal of the driving circuit and the arteries and veins
The output terminal connection of wide modulator, the output terminal of the driving circuit respectively with the input terminal of phase inverter and the grid of the first metal-oxide-semiconductor
Pole connects, and the output terminal of the phase inverter is connected with the grid of the second metal-oxide-semiconductor, the first connecting pin and the electricity of second metal-oxide-semiconductor
Press VddConnection, the second connection end of second metal-oxide-semiconductor is connected with the first connecting pin of first metal-oxide-semiconductor, while with first
The first connecting pin connection of inductance, the second connection end of first metal-oxide-semiconductor are connected with reference ground, and the second of first inductance
Connecting pin is connected with the first connecting pin of the first capacitance, while as the output terminal of the output voltage regulation circuit, described
The second connection end of one capacitance is connected with reference ground.
Preferably, the pulse-width modulation circuit is realized using microprocessor.
Preferably, the output voltage regulation circuit includes：3rd metal-oxide-semiconductor, the grid of the 3rd metal-oxide-semiconductor with it is described micro-
Processor connects, the first connecting pin and the voltage V of the 3rd metal-oxide-semiconductorddConnection, the second connection end of the 3rd metal-oxide-semiconductor with
The first connecting pin connection of 4th metal-oxide-semiconductor, while be connected with the first connecting pin of the second inductance, the grid of the 4th metal-oxide-semiconductor
It is connected with the microprocessor, the second connection end of the 4th metal-oxide-semiconductor is connected with reference ground, and the second of second inductance connects
End is connect to be connected with the first connecting pin of second capacitance, while as the output terminal of the output voltage regulation circuit, it is described
The second connection end of second capacitance is connected with reference ground.
Preferably, the voltage detecting circuit includes the identical voltage detection unit of N number of circuit structure, each voltage detecting
Unit is connected with the output terminal of the voltage conversion circuit and a battery；Wherein, the voltage detection unit includes：First electricity
Potential source, the anode of the first voltage source are connected with the output terminal of the voltage conversion circuit, the cathode of the first voltage source
It is connected with the first input end of the second error amplifier, the second input terminal of second error amplifier and an anode connect
It connects, the output terminal of the output terminal of second error amplifier as the voltage detection unit, wherein, the first voltage source
Voltage for setting pressure difference.
Preferably, the voltage detecting circuit includes：N number of 3rd error amplifier, N number of 3rd error amplifier
Output terminal of the first input end with the voltage conversion circuit is connected, the second input terminal of N number of 3rd error amplifier
The anode with N number of parallel cells is connected respectively, and the output terminal of N number of 3rd error amplifier is electric with the first analog-to-digital conversion respectively
The input terminal connection on road, the output terminal of N number of first analog to digital conversion circuit are connected with first microprocessor, wherein, it is described
First microprocessor is used to respectively compare N number of output signal of first analog to digital conversion circuit output with setting pressure difference
Compared with, and generate N number of error result.
Preferably, the voltage detecting circuit includes：N number of 4th error amplifier, N number of 4th error amplifier
Output terminal of the first input end with the voltage conversion circuit is connected, the second input terminal of N number of 4th error amplifier
The anode with N number of parallel cells is connected respectively, the output terminal choosing with a gating switch respectively of N number of 4th error amplifier
Go side connects, and the connecting pin of the gating switch is connected with the input terminal of the second analog to digital conversion circuit, second analog-to-digital conversion
The output terminal of circuit is connected with the second microprocessor, and control terminal of second microprocessor also with the gating switch is connected,
Wherein, second microprocessor is used for N number of output signal of the second analog to digital conversion circuit output respectively with setting pressure difference
It is compared, and generates N number of error result.
Preferably, the feedback voltage selection circuit includes：Second comparator and N number of switch, wherein, described second compares
Device includes N number of input terminal and N number of output terminal, N number of input terminal of second comparator N with the voltage detecting circuit respectively
A output terminal connects one to one, while the first connecting pin with N number of switch connects one to one respectively, second comparator
Control terminal of N number of output terminal respectively with N number of switch be connected, the second connection end of N number of switch is connected with each other, as the feedback
The output terminal of voltage selecting circuit.
Preferably, the feedback voltage selection circuit is realized using microprocessor.
Preferably, the feedback voltage selection circuit includes：N number of diode, wherein, the anode of N number of diode respectively with
N number of output terminal of the voltage detecting circuit connects one to one, and the cathode of N number of diode is connected with each other, as the feedback
The output terminal of voltage selecting circuit.
Preferably, the charging current control circuit includes：5th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor, the 5th error amplifier and
First resistor, wherein, the first connecting pin of the 5th metal-oxide-semiconductor is connected with the first connecting pin of the 6th metal-oxide-semiconductor, while with
The output terminal connection of the voltage conversion circuit, the second connection end of the 5th metal-oxide-semiconductor is connected with an anode, and described the
The second connection end of six metal-oxide-semiconductors respectively with the first input end of the 5th error amplifier and the first connecting pin of first resistor
Connection, the second connection end of the first resistor are connected with reference ground, and the second input termination of the 5th error amplifier is set
Constant current value, the grid of the 5th metal-oxide-semiconductor are connected with the grid of the 6th metal-oxide-semiconductor, and with the 5th error amplifier
Output terminal connection.
Preferably, the charging current control circuit includes：7th metal-oxide-semiconductor, the first connecting pin of the 7th metal-oxide-semiconductor with
The output terminal connection of the voltage conversion circuit, the second connection end of the 7th metal-oxide-semiconductor respectively with the second voltage source
First connecting pin of anode and second resistance connects, the first input of the cathode of the second voltage source and the 6th error amplifier
End connection, the second connection end of the second resistance connect respectively with the second input terminal of an anode and the 6th error amplifier
It connecing, the output terminal of the 6th error amplifier is connected with the grid of the 7th metal-oxide-semiconductor, wherein, the second voltage source
Voltage is setting pressure difference.
As described above, a kind of parallel cells charging circuit of the utility model, has the advantages that：
1st, the design of charging circuit described in the utility model is passed through so that the output voltage and the worst error result
Pressure difference between corresponding cell voltage is setting pressure difference, realizes and is started to charge up from the minimum battery of voltage, simultaneously as institute
It is smaller to state setting pressure difference, i.e., so that the pressure difference between charging voltage and cell voltage is small as much as possible, so as to ensure battery
Rapidly and efficiently charging and less fever.
2nd, the utility model makes the charging current of every batteries by setting a charging current control circuit for every batteries
Realization is precisely controlled, and is made the charging current of certain batteries excessive due to internal resistance changes after avoiding cell degradation, and then is caused battery
Fever is serious or even the problem of security risk occurs.
3rd, circuit described in the utility model only includes only one voltage conversion circuit, circuit level higher, and core
Piece peripheral components are less, and space and cost is greatly saved.
Description of the drawings
Fig. 1 is shown as the circuit block diagram of the first existing charging modes.
Fig. 2 is shown as the circuit block diagram of existing second of charging modes.
Fig. 3 is shown as the circuit block diagram of the third existing charging modes.
Fig. 4 is shown as the circuit block diagram of charging circuit described in the utility model.
Fig. 5 is shown as a kind of circuit implementations of voltage conversion circuit described in the utility model.
Fig. 6 is shown as another circuit implementations of voltage conversion circuit described in the utility model.
Fig. 7 is shown as a kind of circuit implementations of voltage detecting circuit described in the utility model.
Fig. 8 is shown as another circuit implementations of voltage detecting circuit described in the utility model.
Fig. 9 is shown as another circuit implementations of voltage detecting circuit described in the utility model.
Figure 10 is shown as a kind of circuit implementations of feedback voltage selection circuit described in the utility model.
Figure 11 is shown as another circuit implementations of feedback voltage selection circuit described in the utility model.
Figure 12 is shown as a kind of circuit implementations of charging current control circuit described in the utility model.
Figure 13 is shown as another circuit implementations of charging current control circuit described in the utility model.
Component label instructions
1 voltage conversion front end
2 charge management circuits
3 batteries
4 voltage conversion circuits
41 pulse-width modulation circuits
411 first error amplifiers
412 first comparators
413 ramp generators
414 pulse width modulators
42 output voltage regulation circuits
421 driving circuits
422 phase inverters
5 voltage detecting circuits
51 voltage detection units
511 first voltage sources
512 second error amplifiers
52 the 3rd error amplifiers
53 first analog to digital conversion circuits
54 first microprocessors
55 the 4th error amplifiers
56 second analog-digital converters
57 second microprocessors
6 feedback voltage selection circuits
61 second comparators
7 charging current control circuits
71 the 5th error amplifiers
72 the second voltage sources
73 the 6th error amplifiers
The first metal-oxide-semiconductors of M1
The second metal-oxide-semiconductors of M2
The 3rd metal-oxide-semiconductors of M3
The 4th metal-oxide-semiconductors of M4
The 5th metal-oxide-semiconductors of M5
The 6th metal-oxide-semiconductors of M6
The 7th metal-oxide-semiconductors of M7
The first inductance of L1
The second inductance of L2
The first capacitances of C1
The second capacitances of C2
R1 first resistors
R2 second resistances
K1 gating switches
S1~Sn the first~the n-th is switched
The the first~the n-th diodes of D1~Dn
Specific embodiment
Illustrate the embodiment of the utility model below by way of specific specific example, those skilled in the art can be by this theory
Content disclosed by bright book understands other advantages and effect of the utility model easily.The utility model can also be by addition
Different specific embodiments are embodied or practiced, and the various details in this specification can also be based on different viewpoints with answering
With carrying out various modifications or alterations under the spirit without departing from the utility model.
Fig. 4 is referred to Figure 13.It should be noted that the diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of utility model, the then only display component related with the utility model rather than during according to actual implementation in schema
Component count, shape and size are drawn, and kenel, quantity and the ratio of each component can be a kind of random change during actual implementation
Become, and its assembly layout kenel may also be increasingly complex.
Embodiment one
As shown in figure 4, the present embodiment provides a kind of parallel cells charging circuit, the charging circuit includes：
One voltage conversion circuit 4, the worst error for being exported according to feedback voltage selection circuit export electricity as a result, adjusting
Pressure so that the pressure difference between output voltage cell voltage corresponding with the worst error result is setting pressure difference, into
And it realizes and is started to charge up from the minimum battery of voltage；
One voltage detecting circuit 5, respectively the anode with the output terminal of the voltage conversion circuit 4 and N batteries be connected, use
In the cell voltage of sampling N batteries, and according to the setting pressure difference, the output voltage and N number of cell voltage are distinguished
Error-detecting is carried out, N number of error result is generated and exports；
One feedback voltage selection circuit 6, input terminal are connected respectively with the voltage detecting circuit 5, output terminal and institute
It states voltage conversion circuit 4 to connect, N number of error result for the voltage detecting circuit to be exported is compared, and will
Worst error result is exported；
N number of charging current control circuit 7, output of each charging current control circuit 7 with the voltage conversion circuit 4
The connection of the anode of end and a battery, samples for the cell voltage to rechargeable battery or battery current, and by the battery
Voltage or battery current carry out error-detecting with setting pressure difference or setting electric current value, and then adjust the charging of the rechargeable battery
Electric current makes the charging current be equal to setting electric current value, realizes constant-current charge；
Wherein, N is the integer more than or equal to 2.
As an example, as shown in figure 4, the voltage conversion circuit 4 includes：
Pulse-width modulation circuit 41 is connected with the feedback voltage selection circuit 6, for selecting electricity according to the feedback voltage
The worst error of road output is as a result, adjust the duty cycle of the output signal of the pulse-width modulation circuit；And
Output voltage regulation circuit 42 is connected with the pulse-width modulation circuit 41, for according to the pulse-width modulation circuit
Output Signal Regulation described in output voltage so that output voltage cell voltage corresponding with the worst error result it
Between pressure difference for setting pressure difference.
As an example, as shown in figure 5, the pulse-width modulation circuit 41 includes：First error amplifier 411, described first
The first input end of error amplifier 411 is connected with reference voltage, the second input terminal of first error amplifier 411 and institute
State the output terminal connection of feedback voltage selection circuit 6, output terminal and the first comparator 412 of first error amplifier 411
First input end connection, the second input terminal of the first comparator 412 is connected with ramp generator 413, and described first compares
Output terminal compared with device 412 is connected with the input terminal of pulse width modulator 414, described in the output terminal conduct of the pulse width modulator 414
The output terminal of pulse-width modulation circuit 41.
As an example, as shown in figure 5, the output voltage regulation circuit 42 includes：Driving circuit 421, the driving electricity
The input terminal on road 421 is connected with the output terminal of the pulse width modulator 414, the output terminal of the driving circuit 421 respectively with instead
The grid of the input terminal of phase device 422 and the first metal-oxide-semiconductor M1 connect, the output terminal of the phase inverter 422 and the grid of the second metal-oxide-semiconductor M2
Pole connects, the first connecting pin and the voltage V of the second metal-oxide-semiconductor M2ddConnection, the second connection end of the second metal-oxide-semiconductor M2 with
The first connecting pin connection of the first metal-oxide-semiconductor M1, while be connected with the first connecting pin of the first inductance L1, the first MOS
The second connection end of pipe M1 is connected with reference ground, and the second connection end of the first inductance L1 is connected with the first of the first capacitance C1
End connection, while as the output terminal of the output voltage regulation circuit 42, the second connection end and ginseng of the first capacitance C1
It connects with examining.
As shown in figure 5, the pulse-width modulation circuit exports one after carrying out error amplification by first error amplifier
With worst error result VmaxRelevant dynamic error, then by the oblique wave that the dynamic error of output and ramp generator generate into
Row relatively and after PWM modulation exports a square-wave signal, wherein, duty cycle and the worst error result V of the square-wave signalmax
It is related；When the ON time in the second metal-oxide-semiconductor road is controlled by the square-wave signal, and then controlling the charging of the first inductance
Between, it realizes the adjusting of output voltage, makes the difference of output voltage and cell voltage permanent for setting pressure difference Vs.
It should be noted that the reference voltage VrefFor a constant voltage values, for the feedback voltage selection circuit
The worst error result V of outputmaxError amplification is carried out, and then obtains the dynamic error of system.
As another example, as shown in fig. 6, the pulse-width modulation circuit 41 is realized using microprocessor.
As another example, as shown in fig. 6, the output voltage regulation circuit 42 includes：3rd metal-oxide-semiconductor M3, described
The grid of three metal-oxide-semiconductor M3 is connected with the microprocessor, the first connecting pin and the voltage V of the 3rd metal-oxide-semiconductor M3ddConnection, institute
The second connection end for stating the 3rd metal-oxide-semiconductor M3 is connected with the first connecting pin of the 4th metal-oxide-semiconductor M4, while with the first of the second inductance L2
Connecting pin connects, and the grid of the 4th metal-oxide-semiconductor M4 is connected with the microprocessor, the second connection of the 4th metal-oxide-semiconductor M4
End is connected with reference ground, and the second connection end of the second inductance L2 is connected with the first connecting pin of the second capacitance C2, together
The output terminal of output voltage regulation circuit 42 described in Shi Zuowei, the second connection end of the second capacitance C2 are connected with reference ground.
As shown in fig. 6, the pulse-width modulation circuit carries out related operation by microprocessor adjusts accounting for for its output signal
Empty ratio by controlling the ON time of the 3rd metal-oxide-semiconductor, and then controls the charging time of the second inductance L2, realizes output voltage Vout
Adjusting, make the difference of output voltage and cell voltage permanent for setting pressure difference Vs.
As an example, as shown in fig. 7, the voltage detecting circuit 5 includes the identical voltage detection unit of N number of circuit structure
51, each voltage detection unit is connected with the output terminal of the voltage conversion circuit 4 and a battery；Wherein, the voltage inspection
Surveying unit 51 includes：First voltage source 511, the output terminal of the anode of the first voltage source 511 and the voltage conversion circuit 4
Connection, the cathode of the first voltage source 511 are connected with the first input end of the second error amplifier 512, second error
Second input terminal of amplifier 512 is connected with an anode, and the output terminal of second error amplifier 512 is as the electricity
The output terminal of detection unit 51 is pressed, wherein, the voltage of the first voltage source 511 is setting pressure difference.
As shown in fig. 7, the voltage detection unit is by by the output voltage VoutAfter subtracting each other with setting pressure difference Vs
Difference carries out error amplification with cell voltage, and then obtains corresponding error result.
As another example, as shown in figure 8, the voltage detecting circuit 5 includes：N number of 3rd error amplifier 52, it is N number of
Output terminal of the first input end of 3rd error amplifier 52 with the voltage conversion circuit 4 is connected, and the N number of described 3rd
Anode of second input terminal of error amplifier 52 respectively with N number of parallel cells is connected, N number of 3rd error amplifier 52
Input terminal of the output terminal respectively with the first analog to digital conversion circuit 53 is connected, the output terminal of N number of first analog to digital conversion circuit 53
It is connected with first microprocessor 54, wherein, the first microprocessor 54 is used for first analog to digital conversion circuit 53 is defeated
The N number of output signal gone out is respectively compared with setting pressure difference, and generate N number of error result.
As shown in figure 8, the voltage detecting circuit by the 3rd error amplifier to the output voltage VoutWith battery electricity
Pressure carries out error amplification, and the output signal of the 3rd error amplifier then is converted to number by the first analog to digital conversion circuit
Word signal, and N number of digital signal is input in first microprocessor, the first microprocessor distinguishes N number of digital signal
Compared with setting pressure difference, and then generate N number of error result.
Preferably, the numberical range of the setting pressure difference includes 1mV~900mV；It is further preferred that in the present embodiment
In, the pressure difference that sets is 50mV.
As another example, as shown in figure 9, the voltage detecting circuit 5 includes：N number of 4th error amplifier 55, it is N number of
Output terminal of the first input end of 4th error amplifier 55 with the voltage conversion circuit 4 is connected, and the N number of described 4th
Anode of second input terminal of error amplifier 55 respectively with N number of parallel cells is connected, N number of 4th error amplifier 55
Gated end of the output terminal respectively with a gating switch K1 is connected, connecting pin and the second analog to digital conversion circuit of the gating switch K1
56 input terminal connection, the output terminal of second analog to digital conversion circuit 56 are connected with the second microprocessor 57, and described second is micro-
Control terminal of the processor 57 also with the gating switch K1 is connected, wherein, second microprocessor 57 is used for the second modulus
N number of output signal that conversion circuit 56 exports is respectively compared with setting pressure difference, and generate N number of error result.
As shown in figure 9, the voltage detecting circuit by the 4th error amplifier to the output voltage VoutWith battery electricity
Pressure carries out error amplification, then by gating switch timesharing carries out the output signal of N number of 4th error amplifier respectively defeated
Go out, and pass through the second analog to digital conversion circuit and be converted to digital signal, and be input to the second microprocessor, second microprocessor
By N number of digital signal respectively compared with setting pressure difference, and then generate N number of error result.
As an example, as shown in Figure 10, the feedback voltage selection circuit 6 includes：Second comparator 61 and N number of switch S1
~Sn, wherein, second comparator 61 includes N number of input terminal and N number of output terminal, N number of input of second comparator 61
N number of output terminal respectively with the voltage detecting circuit 5 is held to connect one to one, while the with N number of switch S1~Sn respectively
One connecting pin connects one to one, and N number of output terminal of second comparator 61 connects respectively with N number of control terminal for switching S1~Sn
It connects, the second connection end of N number of switch S1~Sn is connected with each other, the output terminal as the feedback voltage selection circuit 6.
As shown in Figure 10, after N number of error result is compared by second comparator, worst error result generates a control
Signal processed, the corresponding switch of output terminal where controlling it are closed, and realize worst error result VmaxOutput.
As another example, the feedback voltage selection circuit 6 is realized using microprocessor.
It should be noted that by the way that N number of error result is input to microprocessor, and pass through microprocessor to N number of
The error result is compared, to realize worst error result VmaxOutput.
It should be noted that if the voltage conversion circuit, voltage detecting circuit and feedback voltage selection circuit use
When microprocessor is realized, the voltage conversion circuit, voltage detecting circuit and feedback voltage selection circuit can share a microprocessor
Device.
As another example, as shown in figure 11, the feedback voltage selection circuit 6 includes：N number of diode D1~Dn,
In, the N number of output terminal of the anode of N number of diode D1~Dn respectively with the voltage detecting circuit 5 connects one to one, and N number of two
The cathode of pole pipe D1~Dn is connected with each other, the output terminal as the feedback voltage selection circuit 6.
As shown in figure 11, when the multiple voltage acts on the anode of diode simultaneously, branch where worst error result
The diode current flow on road, and then realize the output of worst error result.
As an example, as shown in figure 12, the charging current control circuit 7 includes：5th metal-oxide-semiconductor M5, the 6th metal-oxide-semiconductor
M6, the 5th error amplifier 71 and first resistor R1, wherein, the first connecting pin and the 6th MOS of the 5th metal-oxide-semiconductor M5
The first connecting pin connection of pipe M6, while is connected with the output terminal of the voltage conversion circuit 4, and the of the 5th metal-oxide-semiconductor M5
Two connecting pins are connected with an anode, the second connection end of the 6th metal-oxide-semiconductor M6 respectively with the 5th error amplifier
The first connecting pin connection of 71 first input end and first resistor R1, the second connection end and reference ground of the first resistor R1
Connection, the 5th error amplifier 71 second input termination setting electric current value, the grid of the 5th metal-oxide-semiconductor M5 with it is described
The grid connection of 6th metal-oxide-semiconductor M6, and be connected with the output terminal of the 5th error amplifier 71.
As shown in figure 12, the charging current control circuit is charged electric by the 5th metal-oxide-semiconductor M5 and the 6th metal-oxide-semiconductor M6 samplings
The charging current in pond, and the charging current is input to the 5th error amplifier, the 5th error amplifier is by by institute
It states charging current and carries out error amplification with the setting electric current value Is, realize that the battery carries out constant current with setting electric current value Is and fills
Electricity.
As another example, as shown in figure 13, the charging current control circuit 7 includes：7th metal-oxide-semiconductor M7, described
The first connecting pin of seven metal-oxide-semiconductor M7 is connected with the output terminal of the voltage conversion circuit 4, and the second of the 7th metal-oxide-semiconductor M7 connects
It connects first connecting pin of the end respectively with the anode of the second voltage source 72 and second resistance R2 to be connected, the second voltage source 72
Cathode be connected with the first input end of the 6th error amplifier 73, the second connection end of the second resistance R2 respectively with an electricity
Second input terminal of pond anode and the 6th error amplifier 73 connects, the output terminal of the 6th error amplifier 73 and described the
The grid connection of seven metal-oxide-semiconductor M7, wherein, the voltage of the second voltage source 72 is setting pressure difference.
As an example, the setting pressure difference Vs is equal to the product of the setting electric current value Is and second resistance R2.
As shown in figure 13, the 6th error amplifier puts the cell voltage and setting pressure difference Vs progress error
Greatly, and according to its error amplify as a result, controlling the conducting resistance of the 7th metal-oxide-semiconductor M7, and then realize the battery to set
Current value Is carries out constant-current charge.
Embodiment two
The present embodiment provides a kind of charging method of the parallel cells charging circuit, the charging method includes：
Sample the cell voltage of N section parallel cells, and according to setting pressure difference, respectively to output voltage and cell voltage into
Row error-detecting, and then generate N number of error result；
N number of error result is compared, and according to worst error as a result, adjusting the output voltage so that institute
The pressure difference between output voltage cell voltage corresponding with the worst error result is stated as setting pressure difference, to realize from voltage
Minimum battery starts to charge up；
Meanwhile the cell voltage or battery current of rechargeable battery are sampled, and by the cell voltage or battery current with setting
Differential pressure value or setting electric current value carry out error-detecting, and then adjust the charging current of the rechargeable battery, make the electricity that charges
Stream is equal to setting electric current value, realizes constant-current charge, wherein, N is the integer more than or equal to 2.
As an example, under constant current charging mode (i.e. when cell voltage, which is less than battery full charge, presses), the voltage inspection
Slowdown monitoring circuit is according to setting pressure difference Vs, respectively by output voltage VoutError-detecting is carried out with the cell voltage of N number of parallel cells,
And generate N number of error result V1~Vn；The feedback voltage selection circuit by being compared to N number of error result V1~Vn,
Obtain worst error result Vmax；The voltage conversion circuit is according to worst error result Vmax, adjustment output voltage Vout, make defeated
Go out voltage VoutDifference between cell voltage (i.e. minimum cell voltage) corresponding with worst error result is permanent for setting pressure difference
Value Vs is realized and started to charge up from the minimum battery of voltage.Meanwhile the charging current control circuit is by adjusting charging current,
Charging current is made to be equal to setting electric current value Is, realize constant-current charge.
Specially after the battery of minimum voltage is filled with electric current, which rises, and by voltage detecting circuit, anti-
Under the action of the voltage regulation loop that feedthrough voltage selection circuit and voltage conversion circuit are formed, voltage conversion circuit output is adjusted
Voltage makes it with rise；As the output voltage V of voltage conversion circuit outputoutRise above the battery of the second low-voltage
When, start the battery charging to the second low-voltage, at this point, the battery of minimum voltage and the battery of the second low-voltage charge simultaneously；
Continue to charge with battery, the voltage of minimum voltage battery and the second low-voltage battery rises, voltage conversion circuit output
Output voltage Vout follows rising, when output voltage rises above the battery of the 3rd low-voltage, starts to the 3rd low-voltage
Battery charge, at this point, minimum voltage battery, the second low-voltage battery and the 3rd low-voltage battery charge simultaneously；And so on,
With the progress of charging, the output voltage of voltage conversion circuit follows rising, when the output voltage is higher than all cell voltages
When, parallel cells will be saved to N and be carried out at the same time quick charge.
It should be noted that being started to charge up by battery preferentially minimum to voltage, unique voltage conversion electricity ensure that
Pressure difference between road output voltage and the cell voltage for being electrically charged battery is maximum no more than setting pressure difference, that is, is less than or equal to
Pressure difference is set, so as to reduce the loss of charging, reduces the fever of battery in charging process, and then improves charging effect
Rate.
As an example, the charging method further includes：Constant-voltage charge pattern, under constant-voltage charge pattern, the battery electricity
Pressure is continuously increased to battery full charge pressure, and the charging current is gradually reduced；When the charging current is decreased to the charging of setting
During cut-off current, battery is completed to charge.
It should be noted that being filled with battery current, cell voltage rise, battery charges enters perseverance by constant-current charge
Pressure charge mode (i.e. cell voltage close to battery full charge press when), the error result that the voltage detecting circuit is exported is no longer
As the feedback quantity in feedback control loop, loop feedback amount has turned into cell voltage at this time, and as cell voltage is constantly close to electricity
Pond full charge pressure, the difference between the output voltage and cell voltage constantly reduce, cause the charging current of each battery also by
Decrescence small, when the charging current of each battery is decreased to the charge cutoff electric current of setting, each battery charging terminates.
The difference of voltage conversion circuit, charging current control circuit and feedback voltage selection circuit composition is fed back to below
Road carries out stability and feasibility analysis, and concrete analysis is as follows：
It is output to voltage difference (Δ V)=output voltage (V of the feedback voltage selection circuitout)-cell voltage
(VBAT)
That is Δ V=Vout-VBAT (1)
Formed feedback purpose be obtain with maintenance voltage difference be a smaller direct current constant value Δ V, so as to promote electricity
The charge efficiency in pond and reduction are generated heat.That is Δ V is direct current constant value, such as 50 millivolts.Under the conditions of this, equation (1) can develop into：
Vout=VBAT+ΔV (2)
Wherein, Δ V is a direct current steady state value, peer-to-peer both sides into Mobile state small-signal analysis, equation (2) both sides simultaneously into
Row is differentiated, and the differential value of wherein direct current constant value Δ V is zero.The result of differentiating of equation (2) is：
Δνout=Δ νBAT (3)
(3) are it will already have become clear that difference backfeed loop and cell voltage V from the equation aboveBATBackfeed loop is similar,
The output voltage V of i.e. described voltage conversion circuitoutWith cell voltage VBATBetween voltage difference feed back in circuit not shadow
Ring the loop stability of entire charging system, it is seen then that difference backfeed loop described in the utility model is to stablize, is feasible, and is
It is easily achieved.
In conclusion a kind of parallel cells charging circuit of the utility model, has the advantages that：
1st, the design of charging circuit described in the utility model is passed through so that the output voltage and the worst error result
Pressure difference between corresponding cell voltage is setting pressure difference, realizes and is started to charge up from the minimum battery of voltage, simultaneously as institute
It is smaller to state setting pressure difference, i.e., so that the pressure difference between charging voltage and cell voltage is small as much as possible, so as to ensure battery
Rapidly and efficiently charging and less fever.
2nd, the utility model makes the charging current of every batteries by setting a charging current control circuit for every batteries
Realization is precisely controlled, and is made the charging current of certain batteries excessive due to internal resistance changes after avoiding cell degradation, and then is caused battery
Fever is serious or even the problem of security risk occurs.
3rd, circuit described in the utility model only includes only one voltage conversion circuit, circuit level higher, and core
Piece peripheral components are less, and space and cost is greatly saved.
So the utility model effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The above embodiments are only illustrative of the principle and efficacy of the utility model, new not for this practicality is limited
Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the revealed essence of the utility model
God and all equivalent modifications completed under technological thought or change, should be covered by the claim of the utility model.
Claims (14)
1. a kind of parallel cells charging circuit, which is characterized in that the charging circuit includes：
One voltage conversion circuit for the worst error that is exported according to feedback voltage selection circuit as a result, adjusting output voltage, makes
The pressure difference between output voltage cell voltage corresponding with the worst error result is obtained as setting pressure difference, and then is realized
The battery minimum from voltage starts to charge up；
One voltage detecting circuit, respectively the anode with the output terminal of the voltage conversion circuit and N batteries be connected, for sampling
The cell voltage of N batteries, and according to the setting pressure difference, the output voltage and N number of cell voltage are missed respectively
Difference detection, generates N number of error result and exports；
One feedback voltage selection circuit, input terminal are connected respectively with the voltage detecting circuit, output terminal and the voltage
Conversion circuit connects, and N number of error result for the voltage detecting circuit to be exported is compared, and by worst error
As a result exported；
N number of charging current control circuit, each charging current control circuit with the output terminal of the voltage conversion circuit and one
The anode connection of battery, samples for the cell voltage to rechargeable battery or battery current, and by the cell voltage or
Battery current carries out error-detecting with setting pressure difference or setting electric current value, and then adjusts the charging current of the rechargeable battery,
The charging current is made to be equal to setting electric current value, realizes constant-current charge；
Wherein, N is the integer more than or equal to 2.
2. parallel cells charging circuit according to claim 1, which is characterized in that the voltage conversion circuit includes：
Pulse-width modulation circuit is connected with the feedback voltage selection circuit, for being exported according to the feedback voltage selection circuit
Worst error as a result, adjust the pulse-width modulation circuit output signal duty cycle；And
Output voltage regulation circuit is connected with the pulse-width modulation circuit, for being believed according to the output of the pulse-width modulation circuit
Number adjust the output voltage so that the pressure difference between output voltage cell voltage corresponding with the worst error result
To set pressure difference.
3. parallel cells charging circuit according to claim 2, which is characterized in that the pulse-width modulation circuit includes：The
One error amplifier, the first input end of first error amplifier are connected with reference voltage, first error amplifier
The second input terminal be connected with the output terminal of the feedback voltage selection circuit, the output terminal of first error amplifier and
The first input end connection of one comparator, the second input terminal of the first comparator are connected with ramp generator, and described first
The output terminal of comparator and the input terminal of pulse width modulator connect, and the output terminal of the pulse width modulator is as the pulsewidth modulation
The output terminal of circuit.
4. parallel cells charging circuit according to claim 3, which is characterized in that the output voltage regulation circuit bag
It includes：Driving circuit, the input terminal of the driving circuit are connected with the output terminal of the pulse width modulator, the driving circuit it is defeated
Grid of the outlet respectively with the input terminal of phase inverter and the first metal-oxide-semiconductor is connected, the output terminal of the phase inverter and the second metal-oxide-semiconductor
Grid connects, the first connecting pin and the voltage V of second metal-oxide-semiconductorddConnection, the second connection end of second metal-oxide-semiconductor and institute
The first connecting pin connection of the first metal-oxide-semiconductor is stated, while is connected with the first connecting pin of the first inductance, the of first metal-oxide-semiconductor
Two connecting pins are connected with reference ground, and the second connection end of first inductance is connected with the first connecting pin of the first capacitance, simultaneously
As the output terminal of the output voltage regulation circuit, the second connection end of first capacitance is connected with reference ground.
5. parallel cells charging circuit according to claim 2, which is characterized in that the pulse-width modulation circuit uses micro- place
Device is managed to realize.
6. parallel cells charging circuit according to claim 5, which is characterized in that the output voltage regulation circuit bag
It includes：3rd metal-oxide-semiconductor, the grid of the 3rd metal-oxide-semiconductor are connected with the microprocessor, the first connecting pin of the 3rd metal-oxide-semiconductor
With voltage VddConnection, the second connection end of the 3rd metal-oxide-semiconductor is connected with the first connecting pin of the 4th metal-oxide-semiconductor, while with second
The first connecting pin connection of inductance, the grid of the 4th metal-oxide-semiconductor is connected with the microprocessor, and the of the 4th metal-oxide-semiconductor
Two connecting pins are connected with reference ground, and the second connection end of second inductance is connected with the first connecting pin of the second capacitance, simultaneously
As the output terminal of the output voltage regulation circuit, the second connection end of second capacitance is connected with reference ground.
7. parallel cells charging circuit according to claim 1, which is characterized in that the voltage detecting circuit includes N number of
The identical voltage detection unit of circuit structure, each voltage detection unit are electric with the output terminal of the voltage conversion circuit and one
Pond connects；Wherein, the voltage detection unit includes：First voltage source, the anode of the first voltage source turn with the voltage
The output terminal connection of circuit is changed, the cathode of the first voltage source is connected with the first input end of the second error amplifier, described
Second input terminal of the second error amplifier is connected with an anode, described in the output terminal conduct of second error amplifier
The output terminal of voltage detection unit, wherein, the voltage of the first voltage source is setting pressure difference.
8. parallel cells charging circuit according to claim 1, which is characterized in that the voltage detecting circuit includes：It is N number of
3rd error amplifier, the output terminal of the first input end of N number of 3rd error amplifier with the voltage conversion circuit
Connection, the anode of the second input terminal of N number of 3rd error amplifier respectively with N number of parallel cells are connected, and the N number of described 3rd
Input terminal of the output terminal of error amplifier respectively with the first analog to digital conversion circuit is connected, N number of first analog to digital conversion circuit
Output terminal be connected with first microprocessor, wherein, the first microprocessor is used for first analog to digital conversion circuit
N number of output signal of output is respectively compared with setting pressure difference, and generate N number of error result.
9. parallel cells charging circuit according to claim 1, which is characterized in that the voltage detecting circuit includes：It is N number of
4th error amplifier, the output terminal of the first input end of N number of 4th error amplifier with the voltage conversion circuit
Connection, the anode of the second input terminal of N number of 4th error amplifier respectively with N number of parallel cells are connected, and the N number of described 4th
Gated end of the output terminal of error amplifier respectively with a gating switch is connected, the connecting pin of the gating switch and the second modulus
The input terminal connection of conversion circuit, the output terminal of second analog to digital conversion circuit are connected with the second microprocessor, and described second
Control terminal of the microprocessor also with the gating switch is connected, wherein, second microprocessor is used for the second analog-to-digital conversion
N number of output signal of circuit output is respectively compared with setting pressure difference, and generate N number of error result.
10. parallel cells charging circuit according to claim 1, which is characterized in that the feedback voltage selection circuit bag
It includes：Second comparator and N number of switch, wherein, second comparator includes N number of input terminal and N number of output terminal, second ratio
N number of output terminal of N number of input terminal respectively with the voltage detecting circuit compared with device connects one to one, while is opened respectively with N number of
The first connecting pin closed connects one to one, and N number of output terminal of second comparator connects respectively with the control terminal of N number of switch
It connects, the second connection end of N number of switch is connected with each other, the output terminal as the feedback voltage selection circuit.
11. parallel cells charging circuit according to claim 1, which is characterized in that the feedback voltage selection circuit is adopted
It is realized with microprocessor.
12. parallel cells charging circuit according to claim 1, which is characterized in that the feedback voltage selection circuit bag
It includes：N number of diode, wherein, the anode of N number of diode corresponds respectively with N number of output terminal of the voltage detecting circuit to be connected
It connects, the cathode of N number of diode is connected with each other, the output terminal as the feedback voltage selection circuit.
13. parallel cells charging circuit according to claim 1, which is characterized in that the charging current control circuit bag
It includes：5th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor, the 5th error amplifier and first resistor, wherein, the first connection of the 5th metal-oxide-semiconductor
End is connected with the first connecting pin of the 6th metal-oxide-semiconductor, while is connected with the output terminal of the voltage conversion circuit, the described 5th
The second connection end of metal-oxide-semiconductor is connected with an anode, the second connection end of the 6th metal-oxide-semiconductor respectively with the 5th error
The first input end of amplifier and the first connecting pin connection of first resistor, the second connection end and reference ground of the first resistor
Connection, the second input termination setting electric current value of the 5th error amplifier, the grid and the described 6th of the 5th metal-oxide-semiconductor
The grid connection of metal-oxide-semiconductor, and be connected with the output terminal of the 5th error amplifier.
14. parallel cells charging circuit according to claim 1, which is characterized in that the charging current control circuit bag
It includes：7th metal-oxide-semiconductor, the first connecting pin of the 7th metal-oxide-semiconductor are connected with the output terminal of the voltage conversion circuit, and the described 7th
First connecting pin of the second connection end of metal-oxide-semiconductor respectively with the anode of the second voltage source and second resistance is connected, second electricity
The cathode of potential source is connected with the first input end of the 6th error amplifier, and the second connection end of the second resistance is electric with one respectively
Second input terminal of pond anode and the 6th error amplifier connects, the output terminal and the described 7th of the 6th error amplifier
The grid connection of metal-oxide-semiconductor, wherein, the voltage of the second voltage source is setting pressure difference.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721106948.0U CN207442474U (en) | 2017-08-31 | 2017-08-31 | A kind of parallel cells charging circuit |
| PCT/CN2018/093571 WO2019042003A1 (en) | 2017-08-31 | 2018-06-29 | Parallel battery charging circuit and charging method thereof |
| US16/789,447 US11177684B2 (en) | 2017-08-31 | 2020-02-13 | Parallel battery charging circuit and charging method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721106948.0U CN207442474U (en) | 2017-08-31 | 2017-08-31 | A kind of parallel cells charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207442474U true CN207442474U (en) | 2018-06-01 |
Family
ID=62301160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721106948.0U Withdrawn - After Issue CN207442474U (en) | 2017-08-31 | 2017-08-31 | A kind of parallel cells charging circuit |
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| CN (1) | CN207442474U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394856A (en) * | 2017-08-31 | 2017-11-24 | 上海汇瑞半导体科技有限公司 | A kind of parallel cells charging circuit and its charging method |
| CN111692555A (en) * | 2020-06-15 | 2020-09-22 | 广东电网有限责任公司 | Balloon lamp |
-
2017
- 2017-08-31 CN CN201721106948.0U patent/CN207442474U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394856A (en) * | 2017-08-31 | 2017-11-24 | 上海汇瑞半导体科技有限公司 | A kind of parallel cells charging circuit and its charging method |
| CN107394856B (en) * | 2017-08-31 | 2024-01-30 | 旋智电子科技（上海）有限公司 | Parallel battery charging circuit and charging method thereof |
| CN111692555A (en) * | 2020-06-15 | 2020-09-22 | 广东电网有限责任公司 | Balloon lamp |
| CN111692555B (en) * | 2020-06-15 | 2022-11-29 | 广东电网有限责任公司 | Balloon lamp |
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