CN209627755U - A kind of solar street lamp controller based on MPPT - Google Patents
A kind of solar street lamp controller based on MPPT Download PDFInfo
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- CN209627755U CN209627755U CN201822178519.5U CN201822178519U CN209627755U CN 209627755 U CN209627755 U CN 209627755U CN 201822178519 U CN201822178519 U CN 201822178519U CN 209627755 U CN209627755 U CN 209627755U
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Abstract
The utility model relates to a kind of solar street lamp controllers based on MPPT, including solar panel, battery, LED load and driving circuit, it is connected to filter circuit respectively at the both ends of the solar panel and battery, the LED load is connected to solar battery board ends, the input terminal pin of the driving circuit is correspondingly connected with the pin of main control MCU respectively, accumulator and buck integrated synchronous rectification circuit are in series between the anode of the solar panel and the anode of battery, load switch and discharge current sample circuit are in series between the cathode of the LED load and the cathode of solar panel, charge current sample circuit is in series between the cathode of the battery and the cathode of solar panel, the output pin of the driving chip respectively with load switch and lifting Integrated synchronous rectification circuit is pressed to be connected.The utility model can reduce the production cost of controller, improve production efficiency, improve the performance of controller.
Description
Technical field
The utility model relates to integral solar energy controller for road lamp fields, and in particular to can in solar street lamp controller
Realize MPPT decompression charging and the integrated hardware configuration of voltage increase and current constant electric discharge.
Background technique
Due to the output characteristics of solar panel be it is nonlinear, peak power output is by light intensity and external temperature
It influences bigger.The purpose of MPPT controller is exactly the maximum power in order to find solar panel in real time, makes solar-electricity
Pond plate works on maximum power point (such as Fig. 2), improves the generating efficiency of system；LED is nonlinear device, positive small electricity
Bucklingization can all cause very big curent change (such as Fig. 3), at the same in order to reduce high current it is inconsistent to LED bring brightness and
Height loss, needs the controller with voltage increase and current constant one；
Since the voltage of solar street light field battery is all lower than the voltage of solar panel, so MPPT is controlled
Circuit is using BUCK reduction voltage circuit, and load output is using BOOST booster circuit, and the way of comparative maturity is by two at present
A circuit is made into the independent control of corresponding function respectively, but has the shortcomings that so obvious, and independent control to pacifying on site
Wiring is more complicated when dress, is easy wrong line；Independent control cost is relatively high, and volume is bigger；Because being two independent
System, system matches are comparatively laborious.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of sun based on MPPT for the above-mentioned prior art
Energy circuit lamp controller can reduce the production cost of controller, improve production efficiency, improve the performance of controller.
A kind of the technical scheme in the invention for solving the above technical problem are as follows: solar street light control based on MPPT
Device, including solar panel, battery, LED load and driving circuit, at the both ends of the solar panel and battery
It is connected to filter circuit respectively, the LED load is connected to solar battery board ends, the input terminal pin difference of the driving circuit
It is correspondingly connected with the pin of main control MCU, is in series with energy storage between the anode of the solar panel and the anode of battery
Circuit and buck integrated synchronous rectification circuit, connect between the cathode of the LED load and the cathode of solar panel
There are load switch and discharge current sample circuit, is in series between the cathode of the battery and the cathode of solar panel
Charge current sample circuit, the output pin of the driving circuit respectively with load switch and buck integrated synchronous rectified current
Road is connected, and sends a signal to the open and close that load switch is controlled after driving circuit by main control MCU, and boosting, be depressured it is whole
Flow function.
Preferably, the buck integrated synchronous rectification circuit includes Schottky diode D3 and metal-oxide-semiconductor parallel with one another
The yin of the positive Schottky diode D3 of Q5, Schottky diode D5 and metal-oxide-semiconductor Q6, the solar panel and LED load
Pole, the input terminal of metal-oxide-semiconductor Q5 are connected；The anode of Schottky diode D3, metal-oxide-semiconductor Q5 output end with the negative of energy storage inductor L1
Pole, the input terminal of metal-oxide-semiconductor Q6, the cathode of Schottky diode D5 are connected；Positive phase of the anode of battery with energy storage inductor L1
Even；The cathode of LED load meets the input terminal of metal-oxide-semiconductor Q9, the resistance R17 of the output termination discharge current sample circuit of metal-oxide-semiconductor Q9
Anode, the cathode ground connection of resistance R17.
Preferably, the PWM1 signal of main control MCU is converted to PWMH through overdrive circuit control, controls the grid of metal-oxide-semiconductor Q5；
PWM2 is converted to PWML through overdrive circuit control, controls the grid of metal-oxide-semiconductor Q6；LED_GATE is controlled through overdrive circuit and is formed
The grid of the metal-oxide-semiconductor Q9 of load switch.
Preferably, it is terminated with battery reverse-connection preventing circuit the two of the battery, including the current-limiting resistance being serially connected
R16 and counnter attack metal-oxide-semiconductor Q8, and the zener diode VD1 being connected in parallel on counnter attack metal-oxide-semiconductor Q8,.
Preferably, it is terminated with TVS lightning protection circuit the two of the solar panel, TVS lightning protection circuit is by TVS anti-thunder tube
D4 is constituted.
Preferably, it is connected to the anti-reverse current circuit of charging in the cathode of the solar panel, is made of metal-oxide-semiconductor Q7, it is described
The input terminal of metal-oxide-semiconductor Q7 is connected with the cathode of solar panel, and output end is connected with the cathode of battery, the PV_ of main control MCU
Grid of the GATE through overdrive circuit control counterflow-preventing metal-oxide-semiconductor Q7
Compared with the prior art, the advantages of the utility model are:
Rectifier diode paralleling MOS pipe in traditional BUCK and BOOST circuit is become half-bridge electricity by the utility model
Road forms charge and discharge integrated controller, while according to the different selection synchronous rectification modes of system input and output electric current size
With diode rectification mode, the transfer efficiency and stability of controller are improved.This circuit is by public energy storage inductor and part energy storage
Capacitor, while synchronous rectification is introduced, the size of MOS and diode constant power component can be become smaller, control can be reduced
The production cost of device improves production efficiency, improves the performance of controller.
Specifically include following advantages:
1, using synchronous rectification, power consumption is reduced, increases efficiency for charge-discharge；
2, MPPT maximum power point tracking technology enhances the generating efficiency for adding solar panel；
3, using voltage increase and current constant technology, the service life of LED lamp bead is improved；
4, the installation of integrated design system simplifies, parameter matches flexibly.
Detailed description of the invention
Fig. 1 is a kind of system schematic of the solar street lamp controller based on MPPT of the utility model embodiment.
Fig. 2 is the P/V curve synoptic diagram of solar panel.
Fig. 3 is the P/V curve synoptic diagram of LED load.
Fig. 4 is the circuit diagram of the utility model embodiment charge and discharge control flow chart.
Fig. 5 is the control waveform diagram of the utility model embodiment MPPT charging each metal-oxide-semiconductor of synchronous rectification mode.
Fig. 6 is the control waveform diagram of each metal-oxide-semiconductor of the utility model embodiment MPPT charging diode rectification mode.
Fig. 7 is the control waveform diagram of each metal-oxide-semiconductor when the utility model embodiment synchronous rectification is discharged.
Fig. 8 is the control waveform diagram of each metal-oxide-semiconductor when the utility model embodiment diode rectification discharges.
Specific embodiment
The utility model is described in further detail below in conjunction with figure embodiment.
As shown in Figure 1, solar street lamp controller of one of the present embodiment based on MPPT, including solar battery
Plate, battery, LED load, TVS lightning protection circuit, Lm5109 driving circuit, main control MCU, current sampling circuit, charge counterflow-preventing
Circuit, battery reverse-connection preventing circuit, buck integrated synchronous rectification circuit, energy storage, filter circuit etc..
Wherein D4 is TVS anti-thunder tube, connects and forms lightning protection circuit at the both ends of solar panel, prevents solar panel
By damaging controller when being struck by lightning；Resistance R15, R17 are current sampling circuit, and R15 is charge current sample resistance, by comparing
The real-time current of charging sample circuit obtains the maximum power of solar panel, and resistance R17 is LED current sampling resistor, mentions
For LED load real-time current value, by comparing acquisition constant current value；Q7 is the anti-reverse flow tube that charges, and prevents night battery to the sun
It can solar panel reverse power supply；Q9 is LED load switch；R16, VD1, Q8 constitute battery reverse-connection preventing circuit, when battery is positive
When true connection, the positive voltage BAT+ of battery opens counnter attack metal-oxide-semiconductor Q8 by current-limiting resistance R16, battery can with charge and discharge,
When battery counterattack, VBAT+ cannot open counnter attack metal-oxide-semiconductor Q8, and battery is unable to charge and discharge, and VD1 is zener diode, protection
Metal-oxide-semiconductor Q8 is burnt because of battery over-voltage；C2, C3 are filter capacitor；L1 is energy storage inductor；Q5, Q6, D3, D5 constitute lifting
Press synchronous rectification integral circuitry；Main control MCU samples the voltage of current battery and solar panel, by logic judgment and calculates
Method realizes that MPPT charging and voltage increase and current constant discharging function, the signal of MCU output control each specific function through overdrive circuit
MOS switch；
The PWM1 signal of main control MCU is converted to PWMH through overdrive circuit control, controls 1 foot of metal-oxide-semiconductor Q5；PWM2 passes through
Driving circuit control is converted to PWML, controls 1 foot of metal-oxide-semiconductor Q6；PV_GATE controls counterflow-preventing metal-oxide-semiconductor Q7 through overdrive circuit
1 foot；1 foot of the LED_GATE through overdrive circuit control counterflow-preventing metal-oxide-semiconductor Q9；The anode and LED load of solar panel
Anode with 1 foot of filter capacitor C2,3 feet of Schottky diode D3, metal-oxide-semiconductor Q5 3 feet be connected；Schottky diode D3's
1,2 feet, 2 feet of metal-oxide-semiconductor Q5 are mutually connected together with 3 feet of 1 foot of energy storage inductor L1,3 feet of metal-oxide-semiconductor Q6, Schottky diode D5；
The anode of battery is connected with 2 feet of energy storage inductor L1,1 foot of filter capacitor C3；The cathode of LED load connects 3 feet of Q9, Q9's
2 feet connect 2 feet of LED sampling resistor R17, the 1 foot ground connection of R17；The cathode of solar panel takes over control 3 feet of adverse current metal-oxide-semiconductor Q7,
2 feet of Q7 are grounded；The cathode of battery takes over control 3 feet of anti-metal-oxide-semiconductor Q8, and 2 feet of Q8 meet 2 feet of charging sampling resistor R15, R15
1 foot ground connection, the 2 feet ground connection of filter capacitor C3,1,2 ground connection of 2 feet of metal-oxide-semiconductor Q6, Schottky diode D5；
Control method is following (Fig. 4):
1, main control MCU obtains voltage Vpv, the battery voltage Vbat of current solar panel by sampling；
2, compare the size of solar cell panel voltages Vpv and battery voltage Vbat, if Vpv is greater than Vbat, be
System enters MPPT charge mode (step 3)；If Vpv is less than the voltage of turning on light of setting, system enters constant-current discharge mode (step
It is rapid 5)；
3, into MPPT charging modes, main control MCU output control signal PV_GATE is high level, opens counterflow-preventing metal-oxide-semiconductor
Q7, control signal LED_GATE are low level, close LED load and switch metal-oxide-semiconductor Q9；Q5 is main keyholed back plate in synchronous rectification structure,
Q6 is synchronous rectifier；Main control unit exports same frequency, same to width, the reversed pwm signal of 50KHZ, PWM1, PWM2；When charging is adopted
Sample circuit sampling to charging current Ic be greater than preset synchronous rectification mode and be transformed into diode rectification pattern identification electricity
When flowing Icx, i.e. Ic > Icx, system enters synchronous rectification MPPT charged state, and PWM1, PWM2 are that a pair of complementation with dead zone is defeated
Pwm signal out realizes synchronous rectification；(Fig. 5)
4, when charging sampling circuit samples to charging current Ic be less than preset synchronous rectification mode be transformed into two
When pole pipe rectification mode identifies electric current Icx, i.e. Ic < Icx, system enters diode rectification MPPT charged state, and PWM1 signal is
PWM, PWM2 and the PWM1 that frequency is 50KHZ are with frequency, same to width, reversed, and PWM2 duty ratio is constant for minimum fixed value 2%；System
System enters diode rectification mode；(Fig. 6)
5, system enters constant-current discharge state, and main control MCU output control signal PV_GATE is low level, closes counterflow-preventing
Metal-oxide-semiconductor Q7, control signal LED_GATE are high level, open LED load and switch metal-oxide-semiconductor Q9；In synchronous rectification structure based on Q6
Keyholed back plate, Q5 are synchronous rectifier；When the discharge current Idc that electric discharge sampling circuit samples arrive is greater than preset synchronous rectification mould
When formula is transformed into diode rectification pattern identification electric current Idcx, i.e. Idc > Idcx, system enters synchronous rectification discharge mode；Master control
It is a pair of complementary output pwm signal for having dead zone that MCU, which exports PWM1, PWM2, and frequency 50KHZ realizes synchronous rectification electric discharge；
(Fig. 7)
When electric discharge sampling circuit samples to discharge current Idc be less than preset synchronous rectification mode be transformed into two poles
When pipe rectification mode identifies electric current Idcx, i.e. Idc < Idcx, system enters diode rectification discharge mode；Main control MCU output frequency
Rate is the PWM2 signal of 50KHZ；PWM1 is low level, closes synchronous rectifier Q5, realizes diode rectification mode；(Fig. 8)
In addition to the implementation, the utility model further includes having other embodiments, all to use equivalents or equivalent
The technical solution that alternative is formed, should all fall within the protection scope of the utility model claims.
Claims (6)
1. a kind of solar street lamp controller based on MPPT, including solar panel, battery, LED load and driving electricity
Road is connected to filter circuit at the both ends of the solar panel and battery respectively, and the LED load is connected to solar battery
Board ends, it is characterised in that: the input terminal pin of the driving circuit is correspondingly connected with the pin of main control MCU respectively, described
Accumulator and buck integrated synchronous rectification circuit, In are in series between the anode of solar panel and the anode of battery
Load switch and discharge current sample circuit, In are in series between the cathode of the LED load and the cathode of solar panel
Charge current sample circuit is in series between the cathode of the battery and the cathode of solar panel, the driving circuit
Output pin is connected with load switch and buck integrated synchronous rectification circuit respectively, sends a signal to drive by main control MCU
The open and close of load switch, and boosting, step-down rectifier function are controlled after dynamic circuit.
2. a kind of solar street lamp controller based on MPPT according to claim 1, it is characterised in that: the buck
Integrated synchronous rectification circuit includes Schottky diode D3 and metal-oxide-semiconductor Q5 parallel with one another, Schottky diode D5 and metal-oxide-semiconductor
The cathode of positive Schottky diode D3, the input terminal of metal-oxide-semiconductor Q5 of Q6, the solar panel and LED load are connected；Xiao
The anode of special based diode D3, metal-oxide-semiconductor Q5 output end with the cathode of energy storage inductor L1, the input terminal of metal-oxide-semiconductor Q6, Schottky two
The cathode of pole pipe D5 is connected；The anode of battery is connected with the anode of energy storage inductor L1；The cathode of LED load connects metal-oxide-semiconductor Q9's
Input terminal, the resistance R17 anode of the output termination discharge current sample circuit of metal-oxide-semiconductor Q9, the cathode ground connection of resistance R17.
3. a kind of solar street lamp controller based on MPPT according to claim 2, it is characterised in that: main control MCU
PWM1 signal is converted to PWMH through overdrive circuit control, controls the grid of metal-oxide-semiconductor Q5；PWM2 is controlled through overdrive circuit and is converted
For PWML, the grid of metal-oxide-semiconductor Q6 is controlled；LED_GATE controls the counterflow-preventing metal-oxide-semiconductor Q9 of composition load switch through overdrive circuit
Grid.
4. a kind of solar street lamp controller based on MPPT according to claim 1 or 3, it is characterised in that: described
The two of battery are terminated with battery reverse-connection preventing circuit, the current-limiting resistance R16 including being serially connected and counnter attack metal-oxide-semiconductor Q8, and
The zener diode VD1 being connected in parallel on counnter attack metal-oxide-semiconductor Q8.
5. a kind of solar street lamp controller based on MPPT according to claim 1 or 3, it is characterised in that: described
The two of solar panel are terminated with TVS lightning protection circuit, and TVS lightning protection circuit is made of TVS anti-thunder tube D4.
6. a kind of solar street lamp controller based on MPPT according to claim 1 or 3, it is characterised in that: described
The cathode of solar panel is connected to the anti-reverse current circuit of charging, is made of metal-oxide-semiconductor Q7, the input terminal and the sun of the metal-oxide-semiconductor Q7
The cathode of energy solar panel is connected, and output end is connected with the cathode of battery, and the PV_GATE of main control MCU is controlled through overdrive circuit
The grid of counterflow-preventing metal-oxide-semiconductor Q7.
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| CN201822178519.5U CN209627755U (en) | 2018-12-24 | 2018-12-24 | A kind of solar street lamp controller based on MPPT |
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| CN201822178519.5U CN209627755U (en) | 2018-12-24 | 2018-12-24 | A kind of solar street lamp controller based on MPPT |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934376A (en) * | 2020-07-29 | 2020-11-13 | 江阴华慧源电子技术有限公司 | Control method of low-voltage input constant-voltage output solar controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934376A (en) * | 2020-07-29 | 2020-11-13 | 江阴华慧源电子技术有限公司 | Control method of low-voltage input constant-voltage output solar controller |
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