CN204288041U - A kind of MPPT maximum power point tracking control circuit - Google Patents
A kind of MPPT maximum power point tracking control circuit Download PDFInfo
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- CN204288041U CN204288041U CN201420745040.4U CN201420745040U CN204288041U CN 204288041 U CN204288041 U CN 204288041U CN 201420745040 U CN201420745040 U CN 201420745040U CN 204288041 U CN204288041 U CN 204288041U
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Abstract
The utility model discloses a kind of MPPT maximum power point tracking control circuit, comprise the direct current being arranged on Blast Furnace Top Gas Recovery Turbine Unit (TRT) and export switching tube on main line, produce the pwm circuit of the pwm signal of gauge tap pipe opening and closing; It is characterized in that: described switching tube is field effect transistor Q1; Described pwm circuit comprises PWM topology control chip U3, producing can analog voltage signal MPPT_VS generation device, the operational amplifier U1B of control simulation voltage signal MPPT_VS; The end of oppisite phase of described operational amplifier U1B meets analog voltage signal MPPT_VS by resistance R1, the homophase termination reference voltage of described operational amplifier U1B; Resistance R2 is connected between the end of oppisite phase and output of described operational amplifier U1B.The dutycycle gamut of PWM is changed.The corresponding dutycycle of MPPT_VS benchmark and an output power, power points mutually compares and draws maximal value.The MPPT_VS benchmark that MCU Maximum Power Output point is corresponding, controller is at the duty cycle of maximum power point, and Maximum Power Output, realizes MPPT maximum power point tracking.
Description
Technical field
The utility model relates to MPPT maximum power point tracking control circuit.
Background technology
World energy sources demand is constantly in increase, and sun power and wind energy are desirable, the nexhaustible everywhere green energy resources of a class.This class energy exploitation and application has a basic common ground, gathers Maximum Power Output point and changes by environmental factor.Grasp MPPT maximum power point tracking control principle and method, become most important.
There is no the converter of MPPT (MPPT maximum power point tracking Maximum Power Point Tracking is called for short MPPT) function, according to input source characteristic, exported by the control chip fixed duty cycle of topological transformation circuit.General MPPT function controls, and substantially directly exports PWM drived control switching tube dutycycle by MCU process chip, constantly regulates dutycycle to obtain maximum power point according to the power sampled.The MCU of direct control dutycycle is low-cost, sampling precision and velocity ratio poor, cause MPPT precision on the low side.It is usually expensive again that sampling precision and speed meet the demands.Require that switching controller not only needs MPPT function in a lot of use field, also need to export constant voltage, constant current.Whole use MCU processing controls, except expensive, programmed process control mode is more complicated, and workload and Capability Requirement are also very large.
Utility model content
The utility model, for the more complicated deficiency of current MPPT control circuit journey processing controls mode, provides a kind of MPPT maximum power point tracking control circuit.
The technical scheme that the utility model adopts is: a kind of MPPT maximum power point tracking control circuit, comprises the direct current being arranged on Blast Furnace Top Gas Recovery Turbine Unit (TRT) and exports switching tube on main line, produce the pwm circuit of the pwm signal of gauge tap pipe opening and closing; Described switching tube is field effect transistor Q1;
Described pwm circuit comprises PWM topology control chip U3, producing can analog voltage signal MPPT_VS generation device, the operational amplifier U1B of control simulation voltage signal MPPT_VS; The end of oppisite phase of described operational amplifier U1B meets analog voltage signal MPPT_VS by resistance R1, the homophase termination reference voltage of described operational amplifier U1B; Resistance R2 is connected between the end of oppisite phase and output of described operational amplifier U1B;
Connect the negative electrode of diode D1 in the output of described operational amplifier U1B, FB pin that the anode of diode D1 meets PWM topology control chip U3, the DR pin of PWM topology control chip U3 connects the grid of described field effect transistor Q1.
Compared with prior art, the beneficial effects of the utility model are: select control chip diversity, realize MPPT tracking accuracy more than 99.5%.MPPT control circuit is isolated with feedback pin, does not affect PWM topological chip and controls multiple feedback control loop such as other constant voltage, constant currents etc., can realize automatically switching between each circuit.Meet the many specification requirements of following converter.
Preferred version of the present utility model has: described analog voltage signal MPPT_VS generation device comprises microprocessor U2, resistance R5, resistance R6, electric capacity C1 and electric capacity C2; Described resistance R5 and resistance R6 contacts; The two ends of resistance R6 respectively by electric capacity C1 and electric capacity C2 ground connection, resistance R5 one termination microprocessor U2 produce method signal PWM1.
The processor of analog voltage signal can not be produced for some, can by producing the square-wave signal PWM1 of certain dutycycle, then utilize two-stage integration circuit, the first order integrating circuit formed as resistance R5 above and electric capacity C1 and the second level integrating circuit be made up of resistance R6 and electric capacity C2 produce MPPT_VS.
In addition, also comprise Blast Furnace Top Gas Recovery Turbine Unit (TRT) output voltage detecting circuit and output current detection circuit, described output voltage detecting circuit and output current detection circuit meet described microprocessor U2 respectively.Described output voltage detecting circuit comprises the resistance R11 and resistance R12 that are connected in Blast Furnace Top Gas Recovery Turbine Unit (TRT) output two ends, and the tie point of resistance R11 and resistance R12 meets described microprocessor U2.
Wherein: described output current detection circuit comprises operational amplifier U1A; The in-phase end of described operational amplifier U1A passes through the power supply ground GND of resistance R9 sending and receiving electric installation output; The end of oppisite phase of described operational amplifier U1A passes through the negative wire PT-of resistance R8 sending and receiving electric installation output; Resistance R7 and electric capacity C5 is connected in parallel between power supply ground GND and negative wire PT-; At the end of oppisite phase of described operational amplifier U1A and the indirect resistance R10 of output terminal, between the output terminal of described operational amplifier U1A and described microprocessor U2 are by power supply ground GND, be provided with serial resistance R14 and resistance R13; The tie point of resistance R14 and resistance R13 connects described microprocessor.
Microprocessor U2, by receiving the electric current and voltage that detect, calculates output power, then, change the square wave PWM1 of output in order, then multiplication is carried out to the voltage and current received, obtain second power, so, the PWM1. corresponding to peak power MPPT is found
Also comprise current constant control loop and Isobarically Control loop; Described current constant control loop and Isobarically Control loop are separately positioned between the constant-current control signal PWM3 of described microprocessor output and the FB pin of Isobarically Control signal PWM2 and described PWM topology control chip U3.Described current constant control loop comprises operational amplifier U4B, the constant-current control signal PWM3 output terminal of described microprocessor U2 connects the in-phase end of operational amplifier U4B by resistance R24, resistance R23, resistance R22 series winding, at the two ends of resistance R23 respectively by electric capacity C11 and C10 ground connection; The end of oppisite phase of described operational amplifier U4B connects output current reference current sampling spot by resistance R21; The circuit being connected with electric capacity C9 and being contacted by electric capacity C8 and resistance R20 between the end of oppisite phase and output of described operational amplifier U4B; The output of described operational amplifier U4B connects the negative electrode of diode D4, and the anode of diode D4 connects the FB pin of described PWM topology control chip U3.Described Isobarically Control loop comprises operational amplifier U4A, the Isobarically Control signal PWM2 output terminal of described microprocessor U2 connects the in-phase end of operational amplifier U4A by resistance R27, resistance R26, resistance R19 series winding, at the two ends of resistance R26 respectively by electric capacity C12 and C13 ground connection; The end of oppisite phase of described operational amplifier U4A connects output reference voltage by resistance; The circuit being connected with electric capacity C7 and being contacted by electric capacity C6 and resistance R16 between the end of oppisite phase and output of described operational amplifier U4A; The output of described operational amplifier U4A connects the negative electrode of diode D3, and the anode of diode D3 connects the FB pin of described PWM topology control chip U3.
Resistance R25 is connected with between the FB pin and Verf pin of described PWM topology control chip U3.
Below with reference to drawings and Examples, the utility model is described in detail.
Accompanying drawing explanation
Fig. 1 is the utility model embodiment 1 schematic diagram.
Fig. 2 is the schematic diagram of the utility model embodiment 2.
Fig. 3 is the schematic diagram of the utility model embodiment 3.
Fig. 4 is translation circuit when adopting wind-power electricity generation.
Embodiment
Embodiment 1, as shown in Figure 1, the present embodiment is a kind of MPPT control circuit, the microprocessor U2 adopted in the present embodiment, can produce the voltage signal MPPT_VS of simulation, through resistance R1 concatenation operation amplifier U1B end of oppisite phase, operational amplifier U1B end of oppisite phase is connected with output terminal resistance R2.In-phase end is the fixed reference potential of Vcc through resistance R3, resistance R4 series connection dividing potential drop.MPPT_VS changes from small to large, then export the 7th pin and change from big to small, and when the 7th pin is less than feedback pin FB, diode D1 conducting, makes pwm chip export DR dutycycle and change from big to small.MPPT_VS also can change from big to small, and DR dutycycle is changed from small to large.
In the present embodiment, it is one-to-one relationship that PWM topology control chip U3 feeds back pin FB level with the dutycycle of driving pin DR.Microprocessor U2 exports MPPT_VS benchmark dull linear change in (0 ~ VDD) scope, and after R1, R2, R3, R4, U1, D1 circuit in Fig. 1, meet feedback FB pin gamut monotone variation, U3 driving DR dutycycle will from being up to little change.The topological transformation circuit of Blast Furnace Top Gas Recovery Turbine Unit (TRT), such as BUCK, BOOST, counterattack, forehand, half-bridge, full-bridge etc. and they develop circuit, according to input and output, watt level, actual use selects different topologys, and this MPPT loop does not specify topology, does not limit use.This patent is a kind of circuit increasing MPPT function on original topological circuit.The switching tube of topological transformation circuit in the change in duty cycle process driving DR, the different voltage U of I/O and electric current I.U2 power P=UI corresponding to different MPPT_VS benchmark that sample compares mutually, and obtaining, MPPT_VS reference level corresponding to maximum power point is fixing to be exported, and makes topological circuit be operated in Maximum Power Output point, realizes input MPPT maximum power point tracking.
As shown in Figure 2, for the control circuit figure of embodiment 2, in this mode, the microprocessor U2 used can not produce the square-wave signal that analog voltage letter MPPT_VS can only produce certain dutycycle, as U2 in Fig. 2 exports PWM1 square wave, change in duty cycle scope 0 ~ 100%, through resistance R5, resistance R6, electric capacity C1, electric capacity C2 one to one MPPT_VS scope be (0 ~ VDD).PWM1 is integrated into analog quantity MPPT_VS through R5, C1 and R6, C2 twice capacitance-resistance, the amplitude of PWM1 is VDD, dutycycle is D, then there is MPPT_VS=VDD*D, dutycycle D corresponding an analog level MPPT_VS, a D then have MPPT_VS to be (0 ~ VDD) for (0 ~ 100%).PWM1 dutycycle is in the process of change, and sampling is compared, and MCU samples U, I, calculate the P=U*I that the dutycycle D of difference is corresponding, mutually compare P and draw maximum merit, obtain maximum power point, the dutycycle PWM1 that fixing Maximum Power Output point is corresponding, traces into maximum power point.Power input point is by such environmental effects, and MCU can according to circumstances at interval of a period of time repeat track maximum power point.MPPT_VS or the PWM1 square wave that microprocessor U2 exports and pwm chip U3 export the dutycycle driving DR, transducer I/O UI power points one_to_one corresponding, determine MPPT_VS or PWM1 by sampling I/O U, I.
In Fig. 2, VCC is fixing power supply electrical level, and through resistance R4, resistance R3 dividing potential drop to the anode of amplifier U1B, MPPT_VS benchmark connects the negative terminal of amplifier U1B through resistance R1, and amplifier U1B negative terminal is connected with resistance R2 with output.Circuit, by the resistance of regulating resistance R1, resistance R2, resistance R3, resistance R4, can meet the level range required for feedback pin FB.Diode D1 Main Function is other circuit of isolation feedback pin FB, and when exiting MPPT pattern, MPPT_VS benchmark goes out low level, and amplifier exports high level, does not affect other circuit workings of FB pin.When control chip FB pin does not connect other circuit such as constant voltage, constant current, can arbitrarily commutate on demand in diode D1 anode and cathode direction, also can remove diode D1, and amplifier exports and directly connects feedback FB.
As shown in Figure 3, Blast Furnace Top Gas Recovery Turbine Unit (TRT), the main topology as the green energy resource such as photovoltaic power generation apparatus or wind power generation plant Blast Furnace Top Gas Recovery Turbine Unit (TRT) is BUCK translation circuit to embodiment 3, and the model of PWM topology control chip U2 is UC2843B, MCU process chip STM32F103C8T6.Input PV+, PV-connect solar panel, and export OUT+, GND and connect battery and load, constant voltage loop set point is generally battery and is full of voltage, and constant current loop set point is generally battery maximum charging current, plays protection galvanic action.
When having sunlight under normal circumstances, sample U, I of microprocessor U2 inputs from PA6, PA7 pin respectively.Constant voltage value is set higher than cell voltage by PWM2, set constant current value by PWM3 and be greater than output current, thus the 1st of U4A the, 7 pin go out high level open loop, entering MPPT loop to work independently. the feedback FB pin of control chip does not have pull-up level to be then raise level by filling with voltage, has pull-up level to be then that absorbing current drags down level.Can realize filling with high or dragging down control mode.Work together for multiple loop in this example, increase a pull-up resistor R25, when sunlight is too powerful make output current be greater than setting value time, PWM1 diminishes and makes MPPT loop enter open loop, is switched to the work of constant current ring.When battery reach be full of value time, controller output current is little, the open loop of constant current ring, and U2 makes PWM1 dutycycle increase (should change into: reduce), makes it open loop and exits MPPT, enter constant voltage loop work.Mutually switch according to actual conditions between three loops, make whole controller more perfect.
Do not have sunlight or long-time rainy weather evening, the battery stored energy that needs again to charge in time is for subsequent use, and input PV+, PV-connect other direct voltage sources and charge.Intelligent Single-Chip Based judges that input source is not solar panel, by PWM1 open loop MPPT loop, by constant current, constant voltage loop switch operating until battery is full of.
This example MPPT maximum power point tracking controls main devices parameter designing.The diode that diode D1 uses pressure drop little, such as schottky diode.U1 uses the good amplifier of the linearity.Known by the technical information of UC2843, feedback pin FB changes theoretical level range can realize DR dutycycle 0 ~ 100% change at (0 ~ 5V).In order to reduce tracking time and precision, need to confirm the level actual change scope of FB pin in this topological circuit further.Debugged voltage loop, direct current inputs gamut change, and output load gamut changes, and exports cell voltage change, and measurement FB pin level is scope is (1.07V ~ 4.12V).Output current is considered as being about to be full of battery and exits MPPT loop when being less than 1A, FB pin scope value is (2.22V ~ 4.12V).Benchmark VREF=5V, resistance R3 gets 1K, and R4 gets 30K, and R1 gets 14.2K, and R2 gets 15.6K, calculates MPPT_VS span (2.6V ~ 0.8V).The supply voltage of U2 is 3.3V, R5, R6 gets 10K, and C1, C2 get 1uF and form integrating circuit, and calculating PWM1 change in duty cycle is 78.79% ~ 24.24%.After entering MPPT pattern, the PWM1 dutycycle of U3 is in 78.79% ~ 24.24% change, and sampled output power P=UI compares, and after obtaining maximum power point, the dutycycle that PWM1 Maximum Power Output point is corresponding just can make controller realize MPPT maximum power point tracking.
It is alternating current AC1, AC2 that the blower fan of wind energy exports, and the BD1 rectifier bridge stack increased in Fig. 4 at this example input end becomes DC voltage, and so this example circuit becomes the wind energy control circuit of band MPPT function.
MPPT loop in Fig. 3 is removed, and circuit is general conventional DC-DC step-down BUCK circuit, and circuit has output constant pressure and flow function.May be used for controller for solar after increasing MPPT loop, increase rectifier bridge in input and then may be used for wind energy controller.When input source PV+, PV-or AC1, AC2 are stable inputs, when not needing maximal power tracing, the dutycycle of PWM1 or MPPT_VS are 0, then U1 the 7th pin is constant high level, MPPT loop does not participate in controller work, and now power supply can use as general DC-DC converter.Can be drawn by above feature, general conventional ripe DC-DC topological transformation circuit only needs to increase this patent MPPT circuit and namely can be used on sun power or wind energy field, and retains original function, makes the usable range of power supply more wide.
Claims (9)
1. a MPPT maximum power point tracking control circuit, comprises the direct current being arranged on Blast Furnace Top Gas Recovery Turbine Unit (TRT) and exports switching tube on main line, produce the pwm circuit of the pwm signal of gauge tap pipe opening and closing; It is characterized in that: described switching tube is field effect transistor Q1;
Described pwm circuit comprises PWM topology control chip U3, producing can analog voltage signal MPPT_VS generation device, the operational amplifier U1B of control simulation voltage signal MPPT_VS; The end of oppisite phase of described operational amplifier U1B meets analog voltage signal MPPT_VS by resistance R1, the homophase termination reference voltage of described operational amplifier U1B; Resistance R2 is connected between the end of oppisite phase and output of described operational amplifier U1B;
Connect the negative electrode of diode D1 in the output of described operational amplifier U1B, FB pin that the anode of diode D1 meets PWM topology control chip U3, the DR pin of PWM topology control chip U3 connects the grid of described field effect transistor Q1.
2. MPPT maximum power point tracking control circuit according to claim 1, is characterized in that: described analog voltage signal MPPT_VS generation device comprises microprocessor U2, resistance R5, resistance R6, electric capacity C1 and electric capacity C2; Described resistance R5 and resistance R6 contacts; The two ends of resistance R6 respectively by electric capacity C1 and electric capacity C2 ground connection, resistance R5 one termination microprocessor U2 produce method signal PWM1.
3. MPPT maximum power point tracking control circuit according to claim 2, it is characterized in that: also comprise Blast Furnace Top Gas Recovery Turbine Unit (TRT) output voltage detecting circuit and output current detection circuit, described output voltage detecting circuit and output current detection circuit meet described microprocessor U2 respectively.
4. MPPT maximum power point tracking control circuit according to claim 3, it is characterized in that: described output voltage detecting circuit comprises the resistance R11 and resistance R12 that are connected in Blast Furnace Top Gas Recovery Turbine Unit (TRT) output two ends, and the tie point of resistance R11 and resistance R12 meets described microprocessor U2.
5. MPPT maximum power point tracking control circuit according to claim 3, is characterized in that: described output current detection circuit comprises operational amplifier U1A; The in-phase end of described operational amplifier U1A passes through the power supply ground GND of resistance R9 sending and receiving electric installation output; The end of oppisite phase of described operational amplifier U1A passes through the negative wire PT-of resistance R8 sending and receiving electric installation output; Resistance R7 and electric capacity C5 is connected in parallel between power supply ground GND and negative wire PT-; At the end of oppisite phase of described operational amplifier U1A and the indirect resistance R10 of output terminal, between the output terminal and power supply ground GND of described operational amplifier U1A, be provided with serial resistance R14 and resistance R13; The tie point of resistance R14 and resistance R13 connects the PA7 pin of described microprocessor U2.
6. MPPT maximum power point tracking control circuit according to claim 2, is characterized in that: also comprise current constant control loop and Isobarically Control loop; Described current constant control loop and Isobarically Control loop are separately positioned between the constant-current control signal PWM3 of described microprocessor output and the FB pin of Isobarically Control signal PWM2 and described PWM topology control chip U3.
7. MPPT maximum power point tracking control circuit according to claim 6, it is characterized in that: described current constant control loop comprises operational amplifier U4B, the constant-current control signal PWM3 output terminal of described microprocessor U2 connects the in-phase end of operational amplifier U4B by resistance R24, resistance R23, resistance R22 series winding, at the two ends of resistance R23 respectively by electric capacity C11 and C10 ground connection; The end of oppisite phase of described operational amplifier U4B connects output current reference voltage by resistance R21; The circuit being connected with electric capacity C9 and being contacted by electric capacity C8 and resistance R20 between the end of oppisite phase and output of described operational amplifier U4B; The output of described operational amplifier U4B connects the negative electrode of diode D4, and the anode of diode D4 connects the FB pin of described PWM topology control chip U3.
8. MPPT maximum power point tracking control circuit according to claim 6, it is characterized in that: described Isobarically Control loop comprises operational amplifier U4A, the Isobarically Control signal PWM2 output terminal of described microprocessor U2 connects the in-phase end of operational amplifier U4A by resistance R27, resistance R26, resistance R19 series winding, at the two ends of resistance R26 respectively by electric capacity C12 and C13 ground connection; The end of oppisite phase of described operational amplifier U4A connects output reference voltage by resistance; The circuit being connected with electric capacity C7 and being contacted by electric capacity C6 and resistance R16 between the end of oppisite phase and output of described operational amplifier U4A; The output of described operation amplifier U4A connects the negative electrode of diode D3, and the anode of diode D3 connects the FB pin of described PWM topology control chip U3.
9. according to described MPPT maximum power point tracking control circuit arbitrary in claim 1 to 8, it is characterized in that: between the FB pin and Verf pin of described PWM topology control chip U3, be connected with resistance R25.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655770A (en) * | 2016-11-22 | 2017-05-10 | 贺川 | Control method for achieving constant-current operation of boost circuit through no-current sampling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655770A (en) * | 2016-11-22 | 2017-05-10 | 贺川 | Control method for achieving constant-current operation of boost circuit through no-current sampling |
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Address after: 518000 Floors 1-3 and 1-5 of Block A, Block B2, Jinweiyuan Industrial Plant, Longshan District, Pingshan New District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Gold Power Technology Co., Ltd. Address before: 518000 Shenzhen, Guangdong, Pingshan new industrial zone, poly dragon hill area Jinwei Industrial Zone A 1 floor. Patentee before: Shenzhen Gold Power Technology Co., Ltd. |