CN208142879U - Charging control circuit and charging device - Google Patents
Charging control circuit and charging device Download PDFInfo
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- CN208142879U CN208142879U CN201820670853.XU CN201820670853U CN208142879U CN 208142879 U CN208142879 U CN 208142879U CN 201820670853 U CN201820670853 U CN 201820670853U CN 208142879 U CN208142879 U CN 208142879U
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- 238000005070 sampling Methods 0.000 claims abstract description 12
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- 239000003990 capacitor Substances 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model relates to a charge control circuit and charging device belongs to battery charging technical field, has solved the problem of the easy overcharge of prior art battery charging. Comprises a logic control unit and a switch control unit; the logic control unit comprises a voltage comparator U2A and a reference source U1, wherein the positive input end of the voltage comparator U2A is used for inputting the sampling voltage of the rechargeable battery, and the negative input end of the voltage comparator U2 is connected with the reference source U1; in response to the high level output from the voltage comparator U2A, the switch control unit turns off the battery charging main loop. The charging control circuit realizes that the charging loop is turned off in time when the voltage of the battery reaches a set value, thereby preventing the overcharge condition and prolonging the service life of the battery.
Description
Technical field
The utility model relates to charge control technical field more particularly to a kind of charging control circuits and charging unit.
Background technique
Rechargeable battery is many kinds of at present, needs to use charging unit for battery charging.But existing charging unit is being given
Battery is easy to produce overcharge conditions when charging, and significantly impacts the service life of battery.
Utility model content
In view of above-mentioned analysis, the utility model is intended to provide a kind of charging control circuit and charging unit, to solve
Existing charging unit is easy the problem of overcharging.
The purpose of this utility model is mainly achieved through the following technical solutions：
On the one hand, one embodiment provides a kind of charging control circuit, including logic control element and switch control list
Member；
Logic control element, including voltage comparator U2A and a reference source U1, the voltage comparator U2A positive input
For inputting the sampled voltage of rechargeable battery, negative input is connect with a reference source U1；The a reference source U1 is that three ends can
Adjust shunt reference source；
Switch control unit, in response to the high level of voltage comparator U2A output, the switch control unit turns off battery
Charge major loop.
In another embodiment, the switch control unit includes switch driving circuit and switching tube Q2, the switching tube
Q2 is set in charging major loop；In response to the high level of logic control element output, the switch driving circuit driving switch
Pipe Q2 shutdown.
In another embodiment, the switch driving circuit includes triode Q1 and resistance R7~R8；
The triode Q1, base stage are electrically connected with the output end of the voltage comparator U2A；The one of collector and resistance R7
End electrical connection, while being electrically connected with the grid of switching tube Q2；Emitter is connected with power cathode；The other end of resistance R7 be used for
Positive pole is connected；
Resistance R8 is connected between the collector and emitter of the triode Q1；
Cathode of the drain electrode of the switching tube Q2 for rechargeable battery is connected, and source electrode with power cathode for being connected.
It further include being serially connected in the triode Q1 base stage and the voltage comparator U2A output end in another embodiment
Between resistance R6.
It further include resistance R4 in another embodiment, three end adjustable shunt reference source is TL431, the TL431's
Cathode and reference end are connected with the negative input of voltage comparator U2A respectively, and the cathode of the TL431 is with the resistance R4's
One end electrical connection, for the other end of the resistance R4 for connecting positive pole, the anode of the TL431 is negative for connecting power supply
Pole.
In another embodiment, the logic control element further includes resistance R5, and the resistance R5 is serially connected in the voltage
Between the positive input and output end of comparator U2A.
In another embodiment, the logic control element further includes capacitor C1, one end of the capacitor C1 and voltage ratio
Positive input compared with device U2A is connected, and the other end of the capacitor C1 with power cathode for being connected.
In another embodiment, the logic control element further includes capacitor C2, one end of the capacitor C2 and voltage ratio
Output end compared with device U2A is connected, and the other end of the capacitor C2 with power cathode for being connected.
It further include voltage sampling unit in another embodiment, the voltage sampling unit and the voltage comparator U2A
Positive input electrical connection, for the sampled voltage of rechargeable battery to be inputted to the positive input of the voltage comparator U2A.
In another embodiment, the voltage sampling unit includes resistance R2 and R3, the positive input of voltage comparator U2
End is electrically connected with one end of one end of resistance R2, resistance R3 respectively；The other end of resistance R2 is used to be connected with rechargeable battery anode,
The other end of resistance R3 with negative electrode of chargeable battery for being connected.
In another embodiment, further includes the charged state indicating unit being serially connected in charging major loop, be used to indicate and fill
Electricity condition.
In another embodiment, the charged state indicating unit includes resistance R1 and light emitting diode D1；The resistance
One end of R1 with positive pole for being connected, and the other end is connect with the anode of the light emitting diode D1, the light emitting diode
The cathode of D1 is used to connect with the anode of rechargeable battery.
In another embodiment, all ports for being connected with positive pole are electrically connected, as positive pole
Interface；All ports for being connected with power cathode are electrically connected, as power cathode interface；It is all to be used for and charging
The connected port of anode is electrically connected, and makees charging anode interface；All ends for being connected with negative electrode of chargeable battery
Mouth is electrically connected, as charging cathode interface.
On the other hand, a kind of charging unit including charging control circuit described in any of the above-described embodiment is provided.
Above-described embodiment scheme has the beneficial effect that：
1, logic control element is higher than by comparing the size of rechargeable battery sampled voltage and reference voltage in cell voltage
Reference voltage, i.e., when rechargeable battery overcharges, the shutdown of control charging major loop, solve that rechargeable battery easily overcharges is asked
Topic, improves the service life of battery.
2, due to using three end adjustable shunt reference sources as a reference source, the speed of response, preferably TL431 conduct are improved
Benchmark can guarantee the timeliness of response, stop charging immediately after cell voltage reaches preset value.Using accurate 431
Benchmark is done, since voltage comparator and 431 is affected by temperature small, so that entire charging control circuit is affected by temperature small, is improved
Applicability.
3, it is that voltage comparator U2A is mentioned that resistance R5 is arranged between the positive input and output end of voltage comparator U2A
For positive feedback, allow to be arranged cell voltage return difference, only charger just connects again after cell voltage drops to certain value
It charges the battery, control circuit is not in the phenomenon that shutdown is opened repeatedly.
4, due to that can prevent battery-end from thering is clutter voltage disturbance to cause false triggering in rechargeable battery end setting capacitor C1,
Improve the stability of charging control circuit.
5, it since capacitor C2 is arranged in voltage comparator U2A output end, is filtered out power end and other is that may be present miscellaneous
Wave interference, it is therefore prevented that the generation of false triggering improves the reliability of charging control circuit.
6, with power supply positive and negative electrode, the connected port of rechargeable battery positive and negative electrode is electrically connected together, makes entirely to control
Circuit can be made the module of double-width grinding both-end output, can be directly accessed between charger and battery, so that entire control
Circuit can modularization, improve its convenience.
It in the utility model, can also be combined with each other between above-mentioned each technical solution, to realize more preferably combination sides
Case.Other feature and advantage of the utility model will illustrate in the following description, also, certain advantages can be from specification
It becomes apparent, or is understood and implementing the utility model.The purpose of this utility model and other advantages can pass through
It is achieved and obtained in specifically noted content in bright book, claims and attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not considered as limitations of the present invention, entire
In attached drawing, identical reference symbol indicates identical component.
Fig. 1 is the structural block diagram of the utility model one embodiment；
Fig. 2 is the schematic illustration of the utility model one embodiment；
Fig. 3 is the electrical block diagram of another embodiment of the utility model.
Specific embodiment
Specifically describe the preferred embodiment of the utility model with reference to the accompanying drawing, wherein attached drawing constitutes the application one
Point, and be used to illustrate the principles of the present invention together with the embodiments of the present invention, it is not intended to limit the utility model
Range.
One specific embodiment of the utility model, provides a kind of charging control circuit, as shown in Figure 1.The charging control
Circuit processed includes logic control element and switch control unit；Logic control element, including voltage comparator U2A and a reference source
U1, voltage comparator U2A positive input are used to input the sampled voltage of rechargeable battery, negative input and a reference source U1
Connection；A reference source U1 is three end adjustable shunt reference sources；Switch control unit, in response to the height electricity of voltage comparator U2A output
It is flat, the switch control unit shutdown battery charging major loop.
When implementation, as shown in Fig. 2, charging control circuit is connected between charger and rechargeable battery, logic control element
According to the cell voltage of sampling, determine whether the rechargeable battery is full of, when battery underfill, entire circuit conducting, charger
It charges the battery；If being full of, disconnection charging major loop is controlled, stops charging the battery.
Compared with prior art, charging control circuit provided in this embodiment, after battery is full of, shutdown is charged back in time
Road is easy to produce the case where overcharging when battery being prevented to charge, improve the service life of rechargeable battery.And use adjustable point of three ends
A reference source of a reference source as voltage comparator is flowed, the real-time of turn-off response is improved, guarantees that cell voltage reaches preset value
Afterwards, shutdown in time.
Specifically, switch control unit includes switch driving circuit and switching tube Q2, and switching tube Q2 is set to charging master
In circuit；In response to the high level of logic control element output, switch driving circuit driving switch pipe Q2 shutdown.
It should be noted that any high level for being able to respond logic control element output, the shutdown of control switch pipe are opened
Closing driving circuit can apply in the charging control circuit of the present embodiment, and can reach identical effect.
Preferably, switch driving circuit includes triode Q1 and resistance R7~R8, and switching tube Q2 is metal-oxide-semiconductor, switch driving
Circuit is connected by resistance R6 with the output end of logic control element, that is, voltage comparator U2A output end, as shown in Figure 3.Three
Pole pipe Q1, base stage are electrically connected by resistance R6 with the output end of the voltage comparator U2A；One end of collector and resistance R7 electricity
Connection, while being electrically connected with the grid of switching tube Q2；Emitter is connected with power cathode；The other end of resistance R7 is used for and power supply
Anode is connected；Resistance R8 is connected between the collector and emitter of the triode Q1；The drain electrode of switching tube Q2 for fill
The cathode of battery is connected, and source electrode with power cathode for being connected.
It can guarantee to pass through resistance R6 when voltage comparison unit exports low level signal using above-mentioned switch driving circuit
Driving voltage, switching tube Q2 closure, entire major loop conducting of charging, rechargeable battery are provided with the partial pressure of resistance R7 for switching tube Q2
It charges normal；When voltage comparison unit exports high level signal, triode Q1 saturation conduction, R7 both end voltage is very low, that is, opens
Pass pipe Q2 driving voltage is low, and switching tube timely responds to turn off, and entire charge circuit disconnects, and charger stopping charges the battery, and rises
To the effect for preventing over-charging of battery.
Preferably, three end adjustable shunt reference sources are TL431, the cathode of TL431 and reference end respectively with voltage comparator
The negative input of U2A is connected, and the cathode of TL431 is electrically connected with one end of resistance R1, and the other end of resistance R1 is for connecting electricity
Source anode, the anode of TL431 is for connecting power cathode.The TL431 is connect by resistance R1 with positive pole, is compared for voltage
Device provides reference voltage.
TL431 and voltage comparator U2A is influenced by temperature smaller, ensure that the precision of entire control circuit will not
It is influenced by temperature change in environment temperature or device use process, improves the reliability of entire charging control circuit.
Illustratively, as shown in figure 3, being charged with 5V charger to 3.7V Li-Ion rechargeable battery, 3.7V lithium ion battery
It is 4.2V full of rear voltage, TL431 reference voltage is 2.5V.After battery is full of, U2A+ is just above 2.5V, and U2A output is high
Level, by Q1 saturation conduction, R7 both end voltage only has about 0.2V, i.e. switching tube Q2 driving voltage only has 0.2V, i.e. switching tube Q2
Driving voltage only has 0.2V, switching tube Q2 shutdown, and entire charge circuit disconnects, and charger stopping charges the battery, and playing prevents
The effect of over-charging of battery.
After overcharging power-off, due to the fluctuation of voltage, the unlatching repeatedly of switch may be caused, it can be in voltage comparator
Series resistor R5 between the positive input and output end of U2A, it is therefore prevented that the case where opening repeatedly improves charge control
The stability and reliability of circuit.
Specifically, resistance R5 is in parallel with resistance R2, draws high the sampled voltage of battery, U2A when U2A exports high level
Persistently export high level；When U2A exports low level, resistance R5 is in parallel with resistance R3, drags down the sampled voltage of battery, and U2A is held
Continuous output low level；The shutdown of charging major loop repeatedly is avoided to open.
In view of rechargeable battery end may have voltage disturbance signal, to cause false triggering；It can be in charge control
Capacitor C1 is set in circuit, and one end of capacitor C1 is connected with the positive input of voltage comparator U2A, the other end of capacitor C1
For the C that is connected with power cathode, the clutter voltage of battery-end is filtered out, false triggering is prevented, has improved entire charging control circuit
Stability and reliability.
Simultaneously, it is contemplated that power end and other interference signals that may be present perhaps will affect charging accuracy；It can fill
Capacitor C2 is set in electric control circuit, and one end of capacitor C2 is connected with the output end of voltage comparator U2A, and capacitor C2's is another
End has filtered out power end clutter voltage, has prevented false triggering, improved the steady of entire charging control circuit for being connected with power cathode
Qualitative and reliability.
Optionally, voltage sample can choose various ways realization, and any energy should can be illustrated in those skilled in the art
The unit for enough acquiring rechargeable battery both end voltage can be applied in this charging control circuit, and reach identical effect.It is preferred that
For sampling resistor, for example, by using being serially connected in the resistance R2 and R3 at rechargeable battery both ends as voltage sampling unit (as shown in Figure 3),
The positive input of voltage comparator U2A is electrically connected with one end of one end of resistance R2, resistance R3 respectively；The other end of resistance R2
For being connected with rechargeable battery anode, the other end of resistance R3 with negative electrode of chargeable battery for being connected.The voltage sampling unit group
At simple, sampling precision height, the reliability and control precision of charging control circuit are further improved.
In order to show the charged state of rechargeable battery, charged state indicating unit can be concatenated in charging major loop.It can
Choosing, when charging normal, indicator light is bright, extinguishes full of rear indicator light.
Specifically, charged state indicating unit includes resistance R1 and light emitting diode D1；One end of resistance R1 is used for and electricity
Source anode is connected, and the other end is connect with the anode of light emitting diode D1, and the cathode of light emitting diode D1 is used for and rechargeable battery
Anode connection.Light emitting diode D1 is as indicator light, bright when charging normal；After being full of, extinguish.
In order to improve the operability and convenience of charging control circuit, by all ports for being used to be connected with positive pole
It is electrically connected, as positive pole interface；All ports for being connected with power cathode are electrically connected, as electricity
Source cathode interface；All ports for being connected with rechargeable battery anode are electrically connected, and make charging anode interface；Institute is useful
It is electrically connected in the port being connected with negative electrode of chargeable battery, as charging cathode interface；Thus by entire control circuit mould
Entire control circuit, can be made into the module of double-width grinding both-end output by block, and then can be directly accessed charger and electricity
Between pond, the convenience when applicability and use of charging control circuit is greatly improved.
In another embodiment, a kind of charging unit is provided, including the charging control circuit in any of the above-described embodiment.
Optionally, the charging sources such as charging control circuit and existing charger can be integrated, collectively constitutes charging dress
It sets, is directly used in and charges for battery, achieved the effect that prevent over-charging of battery.
Due to the charging unit of the present embodiment, therefore the charging control circuit including any of the above-described embodiment can also reach
The effect of any of the above-described embodiment.
Those skilled in the art should be understood that, in the specific implementation, the parameter of each element in circuit, such as each electricity
Resistance resistance value, each capacitor's capacity all can be set and be adjusted according to actual needs by those skilled in the art, not limited specifically herein
It is fixed.
It will be understood by those skilled in the art that above-described embodiment is not related to the improvement of any software aspects.And as each
Connection type between the hardware device of corresponding function is that those skilled in the art can be realized using the prior art,
This does not elaborate.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in
Change or replacement, should be covered within the scope of the utility model.
Claims (14)
1. a kind of charging control circuit, it is characterised in that：Including logic control element and switch control unit；
Logic control element, including voltage comparator U2A and a reference source U1, the voltage comparator U2A positive input are used for
The sampled voltage of rechargeable battery is inputted, negative input is connect with a reference source U1, is used for input reference voltage；The benchmark
Source U1 is three end adjustable shunt reference sources；
Switch control unit, in response to the high level of voltage comparator U2A output, the switch control unit shutdown battery charging
Major loop.
2. charging control circuit according to claim 1, it is characterised in that：The switch control unit includes switch driving
Circuit and switching tube Q2, the switching tube Q2 are set in charging major loop；In response to logic control element output high level,
The switch driving circuit driving switch pipe Q2 shutdown.
3. charging control circuit according to claim 2, it is characterised in that：The switch driving circuit includes triode Q1
With resistance R7~R8；
The triode Q1, base stage are electrically connected with the output end of the voltage comparator U2A；One end of collector and resistance R7 electricity
Connection, while being electrically connected with the grid of switching tube Q2；Emitter is connected with power cathode；The other end of resistance R7 is used for and power supply
Anode is connected；
Resistance R8 is connected between the collector and emitter of the triode Q1；
Cathode of the drain electrode of the switching tube Q2 for rechargeable battery is connected, and source electrode with power cathode for being connected.
4. charging control circuit according to claim 3, it is characterised in that：It further include being serially connected in the triode Q1 base stage
With the resistance R6 between the voltage comparator U2A output end.
5. charging control circuit described in one of -4 according to claim 1, it is characterised in that：It further include resistance R4, three end
Adjustable shunt reference source is TL431, the cathode of the TL431 and the reference end negative input with voltage comparator U2A respectively
It is connected, the cathode of the TL431 is electrically connected with one end of the resistance R4, and the other end of the resistance R4 is for connecting power supply just
Pole, the anode of the TL431 is for connecting power cathode.
6. charging control circuit described in one of -4 according to claim 1, it is characterised in that：The logic control element further includes
Resistance R5, the resistance R5 are serially connected between the positive input and output end of the voltage comparator U2A.
7. charging control circuit described in one of -4 according to claim 1, it is characterised in that：The logic control element further includes
Capacitor C1, one end of the capacitor C1 are connected with the positive input of voltage comparator U2A, and the other end of the capacitor C1 is used
It is connected in power cathode.
8. charging control circuit described in one of -4 according to claim 1, it is characterised in that：The logic control element further includes
Capacitor C2, one end of the capacitor C2 are connected with the output end of voltage comparator U2A, the other end of the capacitor C2 be used for
Power cathode is connected.
9. charging control circuit according to claim 1, it is characterised in that：It further include voltage sampling unit, the voltage
Sampling unit is electrically connected with the positive input of the voltage comparator U2A, for the sampled voltage of rechargeable battery to be inputted institute
State the positive input of voltage comparator U2A.
10. charging control circuit according to claim 9, it is characterised in that：The voltage sampling unit includes resistance R2
And R3, the positive input of voltage comparator U2 are electrically connected with one end of one end of resistance R2, resistance R3 respectively；Resistance R2's is another
One end with rechargeable battery anode for being connected, and the other end of resistance R3 with negative electrode of chargeable battery for being connected.
11. charging control circuit according to claim 1, it is characterised in that：It further include being serially connected in charging major loop
Charged state indicating unit, is used to indicate charged state.
12. charging control circuit according to claim 11, it is characterised in that：The charged state indicating unit includes electricity
Hinder R1 and light emitting diode D1；One end of the resistance R1 with positive pole for being connected, the other end and the light emitting diode
The anode connection of D1, the cathode of the light emitting diode D1 are used to connect with the anode of rechargeable battery.
13. charging control circuit described in one of 0-12 according to claim 1, it is characterised in that：It is all to be used for and positive pole
Connected port is electrically connected, as positive pole interface；All ports for being connected with power cathode are connected electrically in
Together, as power cathode interface；All ports for being connected with rechargeable battery anode are electrically connected, and make charging anode
Interface；All ports for being connected with negative electrode of chargeable battery are electrically connected, as charging cathode interface.
14. a kind of charging unit, which is characterized in that including any charging control circuit of claim 1-13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820670853.XU CN208142879U (en) | 2018-05-07 | 2018-05-07 | Charging control circuit and charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820670853.XU CN208142879U (en) | 2018-05-07 | 2018-05-07 | Charging control circuit and charging device |
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| Publication Number | Publication Date |
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| CN208142879U true CN208142879U (en) | 2018-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820670853.XU Active CN208142879U (en) | 2018-05-07 | 2018-05-07 | Charging control circuit and charging device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071552A (en) * | 2019-05-30 | 2019-07-30 | 温州大学 | A kind of battery charging management circuit |
| CN110071551A (en) * | 2019-05-30 | 2019-07-30 | 温州贝塔电子科技有限公司 | A kind of mobile phone additives for overcharge protection circuit |
| CN113951851A (en) * | 2021-11-25 | 2022-01-21 | 北京福乐云数据科技有限公司 | Photoelectric wave health multi-parameter detector and control method |
-
2018
- 2018-05-07 CN CN201820670853.XU patent/CN208142879U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071552A (en) * | 2019-05-30 | 2019-07-30 | 温州大学 | A kind of battery charging management circuit |
| CN110071551A (en) * | 2019-05-30 | 2019-07-30 | 温州贝塔电子科技有限公司 | A kind of mobile phone additives for overcharge protection circuit |
| CN110071552B (en) * | 2019-05-30 | 2021-05-04 | 温州大学 | Battery charging management circuit |
| CN110071551B (en) * | 2019-05-30 | 2021-08-03 | 温州贝塔电子科技有限公司 | Overcharge protection circuit for mobile phone |
| CN113951851A (en) * | 2021-11-25 | 2022-01-21 | 北京福乐云数据科技有限公司 | Photoelectric wave health multi-parameter detector and control method |
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Effective date of registration: 20190505 Address after: 510530 3/F 310, 192 Kezhu Road, Guangzhou High-tech Industrial Development Zone, Guangdong Province Patentee after: GUANGZHOU SHIKUN ELECTRONICS Co.,Ltd. Address before: 510530 No. 6, Yun Po four road, Whampoa District, Guangzhou, Guangdong. Patentee before: Guangzhou Shiyuan Electronic Technology Company Limited |