CN202721454U - Solar charging and discharging circuit, solar street lamp and lithium battery protection circuit - Google Patents
Solar charging and discharging circuit, solar street lamp and lithium battery protection circuit Download PDFInfo
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- CN202721454U CN202721454U CN 201120454073 CN201120454073U CN202721454U CN 202721454 U CN202721454 U CN 202721454U CN 201120454073 CN201120454073 CN 201120454073 CN 201120454073 U CN201120454073 U CN 201120454073U CN 202721454 U CN202721454 U CN 202721454U
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/72—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps in street lighting
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Abstract
The utility model relates to a solar charging and discharging circuit, a solar street lamp and a lithium battery protection circuit. The solar charging and discharging circuit comprises a solar cell panel, a load and a lithium battery, wherein the lithium battery is respectively and electrically connected with the solar cell panel and the load. The solar charging and discharging circuit also comprises the lithium battery protection circuit. The lithium battery protection circuit comprises a lithium battery protection IC connected with the lithium battery and used for detecting whether the lithium battery is over-changed or not; an MCU connected with the lithium battery protection IC and used for controlling and stopping the stop of the charging process upon receiving an overcharge signal, wherein the MCU also comprises a signal generator used for generating PWM signals of different duty ratios according to the overcharge frequency, and a PWM pin used for outputting PWM signals; and a switching tube connected with the PWM pin of the MCU and the lithium battery. In this way, the charging protection for lithium batteries is realized, so that lithium batteries are protected from being damaged. The utilization rate of solar energy is also improved, while the cost and the power consumption of the system are lowered.
Description
Technical field
The utility model relates to a kind of Application of Solar Energy field, relates in particular to a kind of solar charging/discharging circuit, solar street light and lithium battery protection circuit.
Background technology
Along with the enhancing of people to environmental protection, energy-saving and emission-reduction consciousness, and the development of the technology of lithium electricity own, advantage is widely used in every profession and trade lithium battery because its volume is little, energy foot, environmental protection and quality are light etc., especially in the application in solar street light field.
Lithium battery need to satisfy the constant-current constant-voltage charging mode, but in the Application of Solar Energy field, need absorption maximum solar energy, adopt system that solar panel, reverse-filling diode and energy-storage battery form to absorb to greatest extent solar energy such as present solar street light, therefore some conflicts with the lithium battery constant-current constant-voltage charging.At present the management system of lithium battery all adopts a specialized lithium battery management IC to protect lithium battery, and this application-specific integrated circuit characteristics are after the over-charge of lithium battery protection, treats that cell voltage returns to overcharge to remove when following, can continue again to charge.In solar street light is used, utilize the principle of solar energy after the over-charging of battery protection according to maximum, cell voltage falls back to very soon and overcharges recovery voltage when following, continues again to charge with maximum current, and so long-time charging is easy to fill lithium battery bad.
Present solution is; in the solar recharging loop, increase once the charging control circuit of cover constant current constant voltage or in case arrived protection electrical voltage point charge closing; the deficiency of these two kinds of methods is to have reduced solar energy utilization ratio and lithium cell charging can't have been reached the saturated capacity of design, and has increased cost, the reduction reliability of controller for solar.
Therefore, existing solar charging/discharging circuit obviously exists inconvenience and defective in actual use, so be necessary to be improved.
The utility model content
Main purpose of the present utility model is to provide a kind of solar charging/discharging circuit, solar street light and lithium battery protection circuit.The effect that it can reach the lithium cell charging protection makes lithium battery not damaged, improves the utilance of solar energy, reduces cost and system power dissipation.
In order to achieve the above object, the utility model proposes a kind of solar charging/discharging circuit, comprise solar panel, load and the lithium battery that is electrically connected with described solar panel and described load respectively, described solar charging/discharging circuit also comprises lithium battery protection circuit, described lithium battery protection circuit comprises: the li-ion cell protection IC for detection of whether described lithium battery overcharges is connected with described lithium battery; Be used for according to overcharging the MCU that signal controlling stops to charge, be connected with described li-ion cell protection IC, described MCU also comprise for according to overcharge number of times produce different duty pwm signal signal generator and be used for output pwm signal and stop the PWM stitch of charging signals, described signal generator is connected with described PWM stitch;
Switching tube S1 is connected with PWM stitch and the described lithium battery of described MCU.
According to solar charging/discharging circuit of the present utility model, described solar panel two ends also are parallel with for the sampling resistor R1, the R2 that described solar panel are carried out voltage sample, and described sampling resistor R1, R2 are connected with described MCU.
According to solar charging/discharging circuit of the present utility model, described solar panel one end is connected with described lithium battery by sampling resistor RS1, and the other end is connected with described switching tube S1 by diode, forms charge circuit; Described load one end is connected with described lithium battery by described sampling resistor RS1, and the other end is connected with described switching tube S1, forms discharge loop.
According to solar charging/discharging circuit of the present utility model, described solar street light also comprises be used to the operational amplification circuit that wakes MCU up, described operational amplification circuit is connected respectively with the two ends of described sampling resistor RS1, and described operational amplification circuit is connected with described MCU.
According to solar charging/discharging circuit of the present utility model, described operational amplification circuit comprises the first operational amplifier and the second operational amplifier that different stitch from described MCU respectively connect, and described the first operational amplifier and the second operational amplifier are all in parallel with described sampling resistor RS1.
According to solar charging/discharging circuit of the present utility model, described the first operational amplifier and the second operational amplifier comprise respectively a comparator.
According to solar charging/discharging circuit of the present utility model, li-ion cell protection IC is the S-8254AAQ chip; Described MCU is the UPD78F9212 chip, and described the first operational amplifier and the second operational amplifier are the ADA4051-2 chip.
According to solar charging/discharging circuit of the present utility model, described solar charging/discharging circuit also comprises the triode that is connected with PWM stitch and the described switching tube S1 of described MCU.
The utility model also provides a kind of solar street light, comprise solar panel, lamp body and the lithium battery that is electrically connected with described solar panel and described lamp body respectively, described solar charging/discharging circuit also comprises lithium battery protection circuit, described lithium battery protection circuit comprises: the li-ion cell protection IC for detection of whether described lithium battery overcharges is connected with described lithium battery; Be used for according to overcharging the MCU that signal controlling stops to charge, be connected with described li-ion cell protection IC, described MCU also comprise for according to overcharge number of times produce different duty pwm signal signal generator and be used for output pwm signal and stop the PWM stitch of charging signals, described signal generator is connected with described PWM stitch; Switching tube S1 is connected with PWM stitch and the described lithium battery of described MCU.
The utility model also provides a kind of lithium battery protection circuit, and described lithium battery protection circuit comprises: lithium battery; Li-ion cell protection IC for detection of whether described lithium battery overcharges is connected with described lithium battery; Be used for according to overcharging the MCU that signal controlling stops to charge, be connected with described li-ion cell protection IC, described MCU also comprise for according to overcharge number of times produce different duty pwm signal signal generator and be used for output pwm signal and stop the PWM stitch of charging signals, described signal generator is connected with described PWM stitch; Switching tube S1 is connected with PWM stitch and the described lithium battery of described MCU.
Whether the utility model detects lithium battery by li-ion cell protection IC and overcharges, when over-charge of lithium battery, li-ion cell protection IC sends to MCU and overcharges signal, and MCU is according to overcharging signal from PWM stitch output low level signal, control switch pipe S1 disconnects, and stops lithium battery being charged; Simultaneously the MCU record overcharges number of times, and according to the pwm signal that overcharges number of times and calculate to produce different duty, when overcharging signal relief, and the PWM stitch output pwm signal of MCU, control S1 cut-offs, with to the lithium battery constant voltage charge; When lithium battery overcharged again, MCU stopped lithium battery being charged, and produced different pwm signals according to overcharging number of times, and when overcharging signal relief, MCU cut-offs by PWM stitch output pwm signal control S1's, with to the lithium battery constant voltage charge; So move in circles the state until lithium battery reaches capacity.When the utility model charged at lithium battery, at first the mode with maximum current was charged to the state of overcharging with lithium battery, when overcharging signal relief, controls by the mode of pulse width modulation lithium battery is carried out constant voltage charge, made lithium battery saturated.Whereby, the utility model can reach the effect of lithium cell charging protection, makes lithium battery not damaged, improves the utilance of solar energy, reduces cost and system power dissipation.
Preferably, MCU also can judge to have or not illumination, unglazed photograph then to make MCU enter dormancy by the sampling resistor R1 in parallel with solar panel, the voltage of R2 are monitored, reduces system power dissipation to reach energy-conservation purpose.
Preferably, after MCU enters dormancy, when lithium battery enters the charge or discharge state, charging and discharging currents flows through sampling resistor RS1, and current signal is converted into voltage signal, by operational amplification circuit this voltage signal is amplified and the backward MCU transmitted signal of comparison process again, MCU is waken up from resting state, MCU judges that lithium battery enters the charge or discharge state, will all zero clearings of the record that overcharged number of times last time, prepare for charge next time when MCU detects discharge signal.
Description of drawings
Fig. 1 is the principle assumption diagram of the utility model solar charging/discharging circuit.
Fig. 2 is the physical circuit figure of a kind of embodiment of the utility model solar charging/discharging circuit.
Fig. 3 is the control flow of circuit among Fig. 2.
In order to make the technical solution of the utility model clearer, clear, be described in further detail below in conjunction with accompanying drawing.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1; a kind of solar charging/discharging circuit of the utility model; comprise solar panel 10, load RL and the lithium battery 20 that is electrically connected with solar panel 10 and load RL respectively; the solar charging/discharging circuit also comprises lithium battery protection circuit; lithium battery protection circuit comprises: li-ion cell protection IC 30, MCU(Micro Control Unit; micro-control unit) 40, switching tube S1, li-ion cell protection IC 30 is connected with lithium battery 20, MCU 40 is connected with li-ion cell protection IC 30 and switching tube S1.Lithium battery 20 also can be preferably the lithium battery bag.
Whether li-ion cell protection IC 30 overcharges for detection of lithium battery 20, can send to MCU 40 after lithium battery 20 overcharges and overcharge signal.
MCU 40 turn-offs according to overcharging Signal-controlled switch pipe S1, stops to lithium battery 20 chargings.MCU 40 also comprises the Modulation for generation of PWM(Pulse Width, pulse width modulation) signal generator and the output pwm signal of signal and stop the PWM stitch of charging signals.When MCU receives when overcharging signal; accumulate once overcharging number of times; and according to the pwm signal that number of times calculates the generation different duty that overcharges of adding up; when li-ion cell protection IC 30 no longer sends (overcharging signal relief) when overcharging signal to MCU 40; MCU 40 sends pwm signal by the PWM stitch to switching tube S1; the opening and closing of control switch pipe S1 are to reach the purpose to lithium battery 20 constant voltage charges.Simultaneously, when MCU 40 controls stop to lithium battery 20 charging, get final product by PWM stitch output low level.
Whether the utility model detects lithium battery by li-ion cell protection IC and overcharges, when over-charge of lithium battery, li-ion cell protection IC sends to MCU and overcharges signal, and MCU is according to overcharging signal from PWM stitch output low level signal, control switch pipe S1 disconnects, and stops lithium battery being charged; Simultaneously the MCU record overcharges number of times, and according to the pwm signal that overcharges number of times and calculate to produce different duty, when overcharging signal relief, and the PWM stitch output pwm signal of MCU, control S1 cut-offs, with to the lithium battery constant voltage charge; When lithium battery overcharged again, MCU stopped lithium battery being charged, and produced different pwm signals according to overcharging number of times, and when overcharging signal relief, MCU cut-offs by PWM stitch output pwm signal control S1's, with to the lithium battery constant voltage charge; So move in circles the state until lithium battery reaches capacity.When the utility model charged at lithium battery, at first the mode with maximum current was charged to the state of overcharging with lithium battery, when overcharging signal relief, controls by the mode of pulse width modulation lithium battery is carried out constant voltage charge, made lithium battery saturated.Whereby, the utility model can reach the effect of lithium cell charging protection, makes lithium battery not damaged, is again the utilance that improves solar energy, reduces cost and system power dissipation.
As shown in Figure 1, solar panel 10 two ends also are parallel with for sampling resistor R1, R2, sampling resistor R1, R2 are connected respectively with MCU 40, MCU 40 monitors the voltage of solar panel 10 by sampling resistor R1, R2, judge and have or not illumination, unglazed photograph then makes MCU 40 enter dormancy, reduces system power dissipation to reach energy-conservation purpose.
As shown in Figure 1, solar panel 10 1 ends are electrically connected with lithium battery 20 by sampling resistor RS1, and the other end is connected with switching tube S1 by diode D1, form charge circuit; Load RL one end is electrically connected with lithium battery 20 by sampling resistor RS1, and the other end is connected with switching tube S1, forms discharge loop.
Sampling resistor RS1 two ends are parallel with operational amplification circuit 50, and operational amplification circuit 50 is connected with MCU 40.Wherein, operational amplification circuit 50 comprises respectively the first operational amplifier and the second operational amplifier that connects from MCU 40 different stitch, and the first operational amplifier and the second operational amplifier all (the first operational amplifier and the second operational amplifier see among Fig. 2 must IC2-1 and IC2-2) in parallel with sampling resistor RS1.After MCU 40 enters dormancy, when lithium battery enters the charge or discharge state, charging and discharging currents flows through sampling resistor RS1, current signal is converted into voltage signal, the first operational amplifier and the second operational amplifier this voltage signal is amplified and with more backward MCU 40 transmitted signals of reference voltage, MCU 40 is waken up from resting state, MCU 40 judges that by the signal of sending according to the first operational amplifier or the second operational amplifier lithium battery enters the charge or discharge state, when detecting discharge signal, MCU 40 will all zero clearings of the record that overcharged number of times last time, prepare for charge next time.
Fig. 2 is the circuit diagram of a kind of specific embodiment of the utility model solar charging/discharging circuit.As shown in the figure, li-ion cell protection IC 30 is denoted as IC1 in Fig. 2, is preferably Seiko S-8254AAQ; MCU 40 directly is denoted as MCU, preferably adopts Japanese auspicious Sha's UPD78F9212, and the first operational amplifier is denoted as IC2-1, and the second operational amplifier is denoted as IC2-2.The solar charging/discharging circuit also comprises the triode Q1 that is connected with PWM stitch and the switching tube S1 of MCU, and the signal that is used for MCU is sent amplifies.
Under charge condition, the Pin1-COP pin of chip IC 1 is low level, and the Pin-14 of MCU detects and is low level; When IC1 during at over-charge protective the COP pin become the output of N raceway groove open circuit, at this moment the Pin-14 of MCU detects and is high level, MCU just closes Pin-15(PWM at once) output low level, close S1, just stop lithium battery 20 chargings, and record overcharges number of times.The voltage that monitors lithium battery 20 as IC1 is all overcharging when recovering following, and whether the pin1-COP pin of IC1 is output low level again, when the pin14 of MCU detects low level, can also charge according to R1 and R2 detection solar panel 10 again.If can charge, then MCU calculates the duty ratio of PWM according to the voltage that overcharges number of times and the solar panel 10 of this moment, thereby indirectly realizes the constant voltage charge process; If can not charge, MCU then exports by the Pin1 pin of judging IC2-1 and whether the Pin1 pin output of IC2-2 all is that low level judges whether system enters dormancy, charging or discharge condition.When system has entered dormancy, switching tube S1 and S2 open, if 20 pairs of load RL discharges of lithium battery, electric current is converted into voltage signal through sampling resistor RS1, again through IC2-1 signal amplify again with benchmark relatively after, the Pin1 output level of IC2-1 changes the Pin16 that inputs to MCU, MCU is waken up enter discharge condition, until MCU enters resting state again; If 10 pairs of lithium batteries of solar panel, 20 chargings, charging current flows through RS1, RS1 is converted into voltage signal to the charging current signal, compare the voltage signal amplification and with reference data through IC2-2 again, the output level of IC2-2 changes the Pin13 that inputs to MCU, MCU is waken up enter charged state.
Fig. 3 has illustrated the control flow of circuit among Fig. 2, it mainly comprises the steps: step S301, detects whether discharge and recharge signal, if there is charging signals then to enter step S302, if there is discharge signal then to enter step S307, if then enter step S309 without discharging and recharging signal.
Step S302 enters charge mode.
Step S303 judges whether solar cell panel voltages can charge, if then lithium battery 20 is charged and enter step S204, then gets back to if not step S301.
Step S304, whether IC1 overcharges, and then enters step S305 if overcharge, and then gets back to if not step S301.
Step S305, the MCU record overcharges number of times.
Step S306, MCU calculate PWM duty ratio output pwm signal, get back to step S301.
Step S307 enters discharge mode, and enters step S308.
Step S308 removes and overcharged number of times, and gets back to step S301 last time.
Step S309 enters park mode, then enters step S302 if wake up from park mode charging, then enters step S307 if discharge wakes up.
The utility model also provides a kind of solar street light, comprise solar panel, lamp body and the lithium battery that is electrically connected with solar panel and lamp body respectively, the solar charging/discharging circuit also comprises lithium battery protection circuit, lithium battery protection circuit comprises: the li-ion cell protection IC for detection of whether described lithium battery overcharges is connected with described lithium battery; Be used for according to overcharging the MCU that signal controlling stops to charge, be connected with described li-ion cell protection IC, described MCU also comprise for according to overcharge number of times produce different duty pwm signal signal generator and be used for output pwm signal and stop the PWM stitch of charging signals, described signal generator is connected with described PWM stitch; Switching tube S1 is connected with PWM stitch and the described lithium battery of described MCU.Particular circuit configurations and the principle of lithium battery protection circuit are described in detail at preamble, so do not repeat them here.
The utility model also provides a kind of lithium battery protection circuit, and described lithium battery protection circuit comprises: lithium battery; Li-ion cell protection IC for detection of whether described lithium battery overcharges is connected with described lithium battery; Be used for according to overcharging the MCU that signal controlling stops to charge, be connected with described li-ion cell protection IC, described MCU also comprise for according to overcharge number of times produce different duty pwm signal signal generator and be used for output pwm signal and stop the PWM stitch of charging signals, described signal generator is connected with described PWM stitch; Switching tube S1 is connected with PWM stitch and the described lithium battery of described MCU.Particular circuit configurations and the principle of lithium battery protection circuit are described in detail at preamble, so do not repeat them here.
In sum, whether the utility model detects lithium battery by li-ion cell protection IC and overcharges, when over-charge of lithium battery, li-ion cell protection IC sends to MCU and overcharges signal, MCU is according to overcharging signal from PWM stitch output low level signal, and control switch pipe S1 disconnects, and stops lithium battery being charged; Simultaneously the MCU record overcharges number of times, and according to the pwm signal that overcharges number of times and calculate to produce different duty, when overcharging signal relief, and the PWM stitch output pwm signal of MCU, control S1 cut-offs, with to the lithium battery constant voltage charge; When lithium battery overcharged again, MCU stopped lithium battery being charged, and produced different pwm signals according to overcharging number of times, and when overcharging signal relief, MCU cut-offs by PWM stitch output pwm signal control S1's, with to the lithium battery constant voltage charge; So move in circles the state until lithium battery reaches capacity.When the utility model charged at lithium battery, at first the mode with maximum current was charged to the state of overcharging with lithium battery, when overcharging signal relief, controls by the mode of pulse width modulation lithium battery is carried out constant voltage charge, made lithium battery saturated.Whereby, the utility model can reach the effect of lithium cell charging protection, makes lithium battery not damaged, improves the utilance of solar energy, reduces cost and system power dissipation.
The above only is preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical field, all in like manner be included in the scope of patent protection of the present utility model.
Claims (10)
1. solar charging/discharging circuit; comprise solar panel, load and the lithium battery that is electrically connected with described solar panel and described load respectively; it is characterized in that described solar charging/discharging circuit also comprises lithium battery protection circuit, described lithium battery protection circuit comprises:
Li-ion cell protection IC is connected with described lithium battery;
Be used for the MCU that control stops to charge, be connected with described li-ion cell protection IC, described MCU also comprises signal generator and PWM stitch, and described signal generator is connected with described PWM stitch;
Switching tube S1 is connected with PWM stitch and the described lithium battery of described MCU.
2. solar charging/discharging circuit according to claim 1 is characterized in that, described solar panel two ends also are parallel with sampling resistor R1, R2, and described sampling resistor R1, R2 are connected with described MCU.
3. solar charging/discharging circuit according to claim 1 is characterized in that, described solar panel one end is connected with described lithium battery by sampling resistor RS1, and the other end is connected with described switching tube S1 by diode, forms charge circuit; Described load one end is connected with described lithium battery by described sampling resistor RS1, and the other end is connected with described switching tube S1, forms discharge loop.
4. solar charging/discharging circuit according to claim 3, it is characterized in that, described solar panel comprises also that be used to the operational amplification circuit that wakes MCU up described operational amplification circuit is connected respectively with the two ends of described sampling resistor RS1, and described operational amplification circuit is connected with described MCU.
5. described solar charging/discharging circuit according to claim 4, it is characterized in that, described operational amplification circuit comprises the first operational amplifier and the second operational amplifier that different stitch from described MCU respectively connect, and described the first operational amplifier and the second operational amplifier are all in parallel with described sampling resistor RS1.
6. solar charging/discharging circuit according to claim 5 is characterized in that, described the first operational amplifier and the second operational amplifier comprise respectively a comparator.
7. solar charging/discharging circuit according to claim 1 is characterized in that, li-ion cell protection IC is the S-8254AAQ chip; Described MCU is the UPD78F9212 chip, and described the first operational amplifier and the second operational amplifier are the ADA4051-2 chip.
8. solar charging/discharging circuit according to claim 1 is characterized in that, described solar charging/discharging circuit also comprises the triode that is connected with PWM stitch and the described switching tube S1 of described MCU.
9. solar street light; comprise solar charging/discharging circuit, the lamp body that comprises solar panel and the lithium battery that is electrically connected with described solar panel and described lamp body respectively; it is characterized in that; described solar charging/discharging circuit also comprises lithium battery protection circuit, and described lithium battery protection circuit comprises:
Li-ion cell protection IC is connected with described lithium battery;
Be used for the MCU that control stops to charge, be connected with described li-ion cell protection IC, described MCU also comprises signal generator and PWM stitch, and described signal generator is connected with described PWM stitch;
Switching tube S1 is connected with PWM stitch and the described lithium battery of described MCU.
10. a lithium battery protection circuit is characterized in that, described lithium battery protection circuit comprises:
Lithium battery;
Li-ion cell protection IC is connected with described lithium battery;
Be used for the MCU that control stops to charge, be connected with described li-ion cell protection IC, described MCU also comprises signal generator and PWM stitch, and described signal generator is connected with described PWM stitch;
Switching tube S1 is connected with PWM stitch and the described lithium battery of described MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120454073 CN202721454U (en) | 2011-11-16 | 2011-11-16 | Solar charging and discharging circuit, solar street lamp and lithium battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120454073 CN202721454U (en) | 2011-11-16 | 2011-11-16 | Solar charging and discharging circuit, solar street lamp and lithium battery protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202721454U true CN202721454U (en) | 2013-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201120454073 Expired - Fee Related CN202721454U (en) | 2011-11-16 | 2011-11-16 | Solar charging and discharging circuit, solar street lamp and lithium battery protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022161275A1 (en) * | 2021-01-26 | 2022-08-04 | 深圳市普渡科技有限公司 | Battery charging protection circuit and robot |
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2011
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022161275A1 (en) * | 2021-01-26 | 2022-08-04 | 深圳市普渡科技有限公司 | Battery charging protection circuit and robot |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130206 Termination date: 20151116 |
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| EXPY | Termination of patent right or utility model |