The content of the invention
The present invention provides a kind of solar charging circuit of lithium battery for problem of the prior art, realizes lithium battery too
Positive energy charge function, its is safe to use, and service life is long, is charged without artificial, and energy-conserving and environment-protective.
In order to solve the above-mentioned technical problem, the present invention is adopted the following technical scheme that:
A kind of solar charging circuit for lithium battery that the present invention is provided, includes:
Charging module is depressured, for the output voltage of solar panels to be down into lithium cell charging voltage;
Sampling module, output voltage, output current and lithium battery temperature for monitoring solar charging circuit;
Dsp controller:For collecting sampled signal that sampling module sends and sending control signal and for controlling decompression charging
The break-make of module;
Protection module, for collecting the control signal that dsp controller is sent;
The second protection circuit for protecting lithium battery is additionally provided between the decompression charging module and lithium battery.
Wherein, the decompression charging module includes metal-oxide-semiconductor Q4, and the grid of the metal-oxide-semiconductor Q4 is connected with dsp controller.
Wherein, the lithium battery is connected with temperature thermistor NTC, the sampling module include voltage sampling circuit,
Current sampling circuit and temperature sampling circuit;
The protection module includes super-charge super-discharge protection circuit, current foldback circuit and thermal-shutdown circuit.
Wherein, the voltage sampling circuit is connected by resistance R14 come the input with the super-charge super-discharge protection circuit;
The current sampling circuit is connected by resistance R26 come the input with the current foldback circuit;The temperature sampling circuit
It is connected by resistance R71 come the input with the thermal-shutdown circuit.
Wherein, the dsp controller is chip TMS320F28035, be provided with the dsp controller pin GPIO22,
Pin GPIO32, pin ADCINA3, pin ADCINA1 and pin EPWM7A, the metal-oxide-semiconductor Q4 grid and pin EPWM7A
Connection;The input of the voltage sampling circuit is connected with lithium battery, the output end and pin of the voltage sampling circuit
ADCINA1 connections, the output end of the super-charge super-discharge protection circuit is connected with pin GPIO22;The current sampling circuit it is defeated
Enter end to be connected with lithium battery, the output end of the current sampling circuit is connected with pin ADCINA3, the current foldback circuit
Output end is connected with pin GPIO32.
Wherein, the second protection circuit includes control chip S8261, the control chip S8261 and includes pin
VDD and pin VSS, the pin VDD and lithium battery positive pole connection, the negative pole connection of the pin VSS and lithium battery.
Beneficial effects of the present invention:
A kind of solar charging circuit for lithium battery that the present invention is provided, lithium battery is by being depressured charging module by solar panels
Input voltage is down to the charging voltage of lithium battery, is realized by the sampling module in dsp controller to solar charging circuit
Output voltage, output current and lithium battery temperature are monitored, and dsp controller is triggered by protection module to control decompression
The break-make of charging module and then realize is protected to lithium battery, the safety and reliability of protection lithium battery;Further, lead to
Cross with the second protection circuit of protection, Cross prevention and overcurrent protection function is overcharged to protect lithium battery and decompression charging mould
The security of block, can prevent the protection module of dsp controller from failing, second protection circuit can play the work of second protection
With, it is ensured that the safety and reliability of lithium battery;The present invention realizes the function of solar charging of lithium battery, its safety in utilization
Height, service life is long, is charged without artificial, and energy-conserving and environment-protective.
Brief description of the drawings
Fig. 1 is a kind of construction module figure of the solar charging circuit of lithium battery of the present invention.
Fig. 2 is the circuit diagram for being depressured charging module of the invention.
Fig. 3 is the circuit diagram of the dsp controller of the present invention.
Fig. 4 is the circuit diagram of the second protection circuit of the present invention.
Fig. 5 is the voltage sampling circuit of the present invention and the circuit diagram of super-charge super-discharge protection circuit.
Fig. 6 is the current sampling circuit of the present invention and the circuit diagram of current foldback circuit.
Fig. 7 is the temperature sampling circuit of the present invention and the circuit diagram of thermal-shutdown circuit.
Include in references of the Fig. 1 into Fig. 7:
1-decompression charging module 2-dsp controller, 3-sampling module
4-protection module, 5-second protection, 6-voltage sampling circuit of circuit
7-temperature sampling circuit, 8-super-charge super-discharge, 9-current foldback circuit of protection circuit
10-thermal-shutdown circuit, 11-current sampling circuit.
Embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further with reference to embodiment and accompanying drawing
It is bright, the content that embodiment is referred to not limitation of the invention.The present invention is described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, Figure 2, a kind of Fig. 3, solar charging circuit of lithium battery, includes:Charging module is depressured, for will too
The output voltage of positive energy plate is down to lithium cell charging voltage;
Sampling module, output voltage, output current and lithium battery temperature for monitoring solar charging circuit;DSP is controlled
Device:For collecting sampled signal that sampling module sends and sending control signal and break-make for controlling decompression charging module;
Protection module, for collecting the control signal that dsp controller is sent;It is additionally provided between the decompression charging module and lithium battery
Second protection circuit for protecting lithium battery.Specifically, lithium battery is by being depressured charging module 1 by the input electricity of solar panels
Pressure drop realizes the output to solar charging circuit by the sampling module 3 in dsp controller 2 to the charging voltage of lithium battery
Voltage, output current and lithium battery temperature are monitored, and the collection signal of sampling module 3 is sent on dsp controller 2, DSP
Controller 2 according to collection signal send a control signal in protection module 4, triggered by protection module 4 dsp controller 2 come
Control is depressured the break-make of charging module and then realized to being protected to lithium battery, protects the safety and reliability of lithium battery;
By protecting lithium battery and decompression to fill with the second protection circuit 5 of protection, Cross prevention and overcurrent protection function is overcharged
The security of electric module 1, can prevent the protection module 4 of dsp controller 2 from failing and causing lithium battery to damage, second protection electricity
Road 5 can play the effect of second protection, it is ensured that the safety and reliability of lithium battery;The present invention realizes the solar energy of lithium battery
Charge function, its is safe to use, and service life is long, is charged without artificial, and energy-conserving and environment-protective;The present invention is applied to a variety of
Situation about being charged to lithium battery is needed, such as the lithium battery in shared bicycle, the lithium battery of outdoor lamp.
Further, the decompression charging module 1 includes metal-oxide-semiconductor Q4, the metal-oxide-semiconductor Q4 grid and dsp controller 2
Connection.Specifically, the dsp controller 2 controls to be depressured the break-make of charging module 1 by controlling metal-oxide-semiconductor Q4 break-make.
Such as Fig. 5, Fig. 6, Fig. 7, a kind of solar charging circuit of lithium battery described in the present embodiment, the negative pole of lithium battery are defeated
Go out end and be connected with temperature thermistor NTC, the sampling module 3 includes voltage sampling circuit 6, current sampling circuit 11 and temperature
Spend sample circuit 7;The protection module 4 includes super-charge super-discharge protection circuit 8, current foldback circuit 9 and thermal-shutdown circuit
10;Specifically, charging voltage, the charging current of the voltage sampling circuit 6, current sampling circuit 11 respectively to voltage reduction module are entered
Collection signal is simultaneously sent and sends control signals to protection module 4 again into dsp controller 2 by row sampling, the temperature sampling
Collection signal is simultaneously sent into dsp controller 2 and again sends control signal by the collecting temperature thermistor NTC of circuit 7 temperature
To protection module 4, pass through 10 pairs of the super-charge super-discharge protection circuit 8 of protection module 4, current foldback circuit 9 and thermal-shutdown circuit
Decompression charging module 1 and lithium battery are protected;
The voltage sampling circuit 6 is connected by resistance R14 with the input of the super-charge super-discharge protection circuit 8;The electric current
Sample circuit 11 is connected by resistance R26 with the input of the current foldback circuit 9;The temperature sampling resistance passes through resistance
R71 is connected with the input of the thermal-shutdown circuit 10.Specifically, the resistance R14, resistance R26 and resistance R71 play negative
The effect of load.
Specifically, protection voltage is overcharged when the charging voltage that dsp controller 2 is sampled by voltage sampling circuit 6 reaches
During 4.25V, the control signal received is fed back to dsp controller 2 by protection module 4, and dsp controller 2, which is received, overcharges protection
Signal, dsp controller 2, which stops output pwm signal, closes metal-oxide-semiconductor Q4, and then disconnects the charging circuit of decompression charging module 1;
When the charging voltage that dsp controller 2 is sampled by voltage sampling circuit 6, which is less than, overcharges recovery voltage 4.15V, super-charge super-discharge
Protection circuit 8 does not work, and is depressured the normal work of charging module 1;When dsp controller 2 by voltage sampling circuit 6 samples battery
When voltage is less than 2.5V, dsp controller 2 receives Cross prevention signal, and dsp controller 2, which stops output pwm signal, makes metal-oxide-semiconductor
Q4 is closed, and disconnects the charging circuit of decompression charging module 1;When dsp controller 2 by voltage sampling circuit 6 sample battery electricity
When pressure is higher than 3V, over-discharge protection circuit does not work, and is depressured the normal work of charging module 1;
When dsp controller 2 by current sampling circuit 11 sample charging current it is too high when, dsp controller 2 receive excessively stream guarantor
Signal is protected, in the presence of current foldback circuit 9, dsp controller 2, which stops output pwm signal, closes metal-oxide-semiconductor Q4, disconnects drop
Press the charging circuit of charging module 1, protection decompression charging module 1 and battery;
When dsp controller 2 can detect NTC resistance information at any time by temperature sampling circuit 7, to judge that the temperature of battery becomes
Change situation, if the temperature detected is too high, dsp controller 2 closes the metal-oxide-semiconductor Q4 of decompression charging module 1 drive signal, stops
Only charge, while cutting off discharge loop, protect the safety of battery.
Such as Fig. 3, a kind of solar charging circuit of lithium battery described in the present embodiment, the dsp controller is chip
Pin GPIO22, pin GPIO32, pin ADCINA3, pin are provided with TMS320F28035, the dsp controller
ADCINA1 and pin EPWM7A, the grid of the metal-oxide-semiconductor Q4 is connected with pin EPWM7A;The input of the voltage sampling circuit
End is connected with lithium battery, and the output end of the voltage sampling circuit is connected with pin ADCINA1, the super-charge super-discharge protection circuit
Output end be connected with pin GPIO22;The input of the current sampling circuit is connected with lithium battery, the current sample electricity
The output end on road is connected with pin ADCINA3, and the output end of the current foldback circuit is connected with pin GPIO32.
Such as Fig. 4, a kind of solar charging circuit of lithium battery described in the present embodiment, the second protection circuit 5 includes
There are control chip S8261, the control chip S8261 to include pin VDD and pin VSS, the pin VDD's and lithium battery
Positive pole is connected, the negative pole connection of the pin VSS and lithium battery.Specifically, the second protection circuit 5 by with control chip
S8261 cooperation, included charging protection function, Cross prevention function and overcurrent protection function;Overcharged when charging voltage reaches
When protecting voltage 4.25V, control chip S8261 output low level drive signals close the metal-oxide-semiconductor inside second protection circuit 5
It is disconnected, cutoff circuit;When charging voltage, which is less than, overcharges recovery voltage 4.15V, control chip S8261 output high level driving letters
Number, reopen the metal-oxide-semiconductor inside second protection circuit 5, the process crosses charging protection function for second protection circuit 5.When
When cell voltage is less than Cross prevention voltage 2.5V, control chip S8261 output low level drive signals make second protection circuit
Metal-oxide-semiconductor shut-off in 5, cutoff circuit;When cell voltage, which was more than, puts recovery voltage 3V, the high electricity of control chip S8261 outputs
Flat drive signal, reopens the metal-oxide-semiconductor in second protection circuit 5, and the process is the Cross prevention work(of second protection circuit 5
Energy;Wherein, PTC resettable fuses are accessed in second protection circuit 5, the fuse has overcurrent protection and automatic two kinds of recovery
Function, its function occurs to prevent battery high-temperature from discharging with unsafe high current.
It is described above, only it is present pre-ferred embodiments, any formal limitation not is made to the present invention, although
The present invention is disclosed as above with preferred embodiment, but is not limited to the present invention, any those skilled in the art,
Do not depart from the range of technical solution of the present invention, when the technology contents using the disclosure above make a little change or are modified to equivalent change
The equivalent embodiment of change, as long as being, without departing from technical solution of the present invention content, to refer to according to the technology of the present invention to above example
Any simple modification, equivalent variations and the modification made, are belonged in the range of technical solution of the present invention.