WO2014005281A1 - Method for controlling solar maxi power point tracking and electrodeless lamp system - Google Patents

Description

 Method for solar energy maximum power tracking control and electrodeless lamp system

 The present invention relates to solar energy tracking technology, and more particularly to a method for solar energy maximum power tracking control and an electrodeless lamp system.

Background technique

 At present, the commonly used methods for maximum power point tracking (MPPT, Maxi Power Point Tracking) in photovoltaic power generation systems are Constant Voltage Tracking (CVT), Perturbation and Observation Algorithm (P & 0), Conductance Increment Method. (InConmental Conductance Algorithm), etc. The Chinese patent entitled "A Solar Power Generation Maximum Power Tracker and Control Method" with the application number of 200410101900.1 uses the constant voltage method to achieve maximum power tracking of solar photovoltaic power generation, that is, the working voltage and open circuit when using solar photovoltaic cells to output maximum power. The approximate proportional relationship between the voltages is used for maximum power point tracking control. The application number is 200710150685.8, and the name is “Digital Signal Processor-based Photovoltaic Power Generation Maximum Power Tracking Control Device”. It is realized by the conductance increment method. The maximum power point tracking is realized by adjusting the system operating voltage to gradually approach the maximum power point voltage. Disturbance observation method finds the maximum power point from the disturbance terminal voltage according to the power-voltage characteristics of the photovoltaic cell.

 It can be seen that in the prior art, the maximum power tracking control of the solar energy has problems such as low output efficiency, low tracking accuracy, high cost, and even tracking failure.

Summary of the invention In view of this, the main object of the present invention is to provide a method for solar maximum power tracking control and an electrodeless lamp system with high output efficiency, high tracking accuracy, and low cost.

 In order to achieve the above object, the first technical solution proposed by the present invention is:

 A method for solar energy maximum power tracking control, comprising the following steps:

Step 1. According to the open circuit voltage of the solar cell, obtain the maximum power reference point voltage U _RF = 16% U _oc ; where, C / . _c is the open circuit voltage of the solar cell.

 Step 2. According to the detected real-time digital DC voltage of the solar cell and the real-time digital DC current, obtain the real-time digital power of the solar cell, which is a natural number.

 Step 3. Compare /^) > /^ - 1) Is it true: If yes, go to step 4; if not, go to step 5.

 Step 4: using pulse width modulation to change the duty cycle of the driving signal ^; fc), keeping the disturbance direction of the real-time digital DC voltage unchanged: maintaining the duty cycle of the driving signal ^; fc) is increasing or decreasing; Step 6.

Step 5: using pulse width modulation to change the duty cycle of the driving signal ^; fc), changing the disturbance direction of the real-time digital DC voltage: changing the duty ratio of the driving signal ^^^ to the increasing state of the driving signal q<J is a reduced state; a state in which the duty ratio q<J of the drive signal is decreased is changed to a duty ratio of the drive signal ^; fc) is an increased state; thereafter, step 6 is performed. Step 6. Determine whether |t/ _Rf - _W (fc)| > t/ _Rf holds: If yes, execute step 7; if not, perform step 8.

 Step 7. Adjust the duty cycle step according to the amount of change of the real-time digital DC voltage △ £ /

-U _RF < Au < -U _RF H, keep the duty cycle step constant; when Δ£/ > 1 ί ^, reduce the duty cycle step Length Δ, HAg = Ag - A; When Δϋ < ^〃, the force increase port duty step Δ, HAg = Ag + A;

 8 where Δ is the amount of change in the duty cycle step Δ; then, go to step 9.

 Step 8. According to the amount of change of the real-time digital DC voltage Δ£/ adjust the duty cycle step:

—U _RF <Au<—U _RF , keeping the duty cycle step Δ constant; when Δ£/ > 1 ί ^, reduce the duty 32 16 16 ^RF ratio step size Δ , and Δί / = Δί / - Δ ; when <丄ί ^, increase the duty cycle step size Δ, and

 32

Ag = Ag + Α; After that, go to step 9.

 Step 9. The duty ratio of the driving signal determined according to the duty cycle step Δ^; fc); adjust the real-time digital DC voltage according to the duty ratio of the driving signal ^; fc) to achieve maximum power tracking of the solar energy.

 In order to achieve the above object, the second technical solution proposed by the present invention is:

Solar induction lamp ballast for real-time digital DC voltage u(k) of the photovoltaic cell obtained according to the detection. Real-time digital DC current acquires real-time digital power to obtain the maximum power reference point voltage of the solar cell, and performs solar energy on the real-time digital DC voltage Maximum output power tracking: According to the increase or decrease of the real-time digital power, the pulse width modulation is used to change the duty cycle of the driving signal ^; fc), and the disturbance direction of the real-time digital DC voltage (fc) is maintained or changed accordingly; When detecting that the DC voltage with the maximum output power is overvoltage, the pulse width modulation is used to change the duty cycle of the driving signal ^; fc) to reduce the real-time digital DC voltage. Further, according to |i/ _Rf -M(fc) | > Is i/ _Rf true, the amount of change in real-time digital DC voltage iiil Δ£/determines the duty cycle step of the drive signal duty cycle q{k; sends the resulting DC voltage with the maximum output power to the grid-connected inverse The transformer is also used to preset the maximum duty cycle step _max and the minimum duty cycle step _mm .

Grid-connected inverter, DC with maximum output power for transmitting solar electrodeless ballasts After the voltage is converted into an AC voltage of the same frequency and in phase with the grid, the AC voltage is sent to the induction lamp.

 The electrodeless lamp is used for converting the alternating voltage sent by the grid-connected inverter from electric energy into magnetic energy, and driving the lamp to emit light in the form of an alternating magnetic field.

 In order to achieve the above object, the third technical solution proposed by the present invention is:

 An electrodeless lamp system with solar energy maximum power tracking control, including a solar energy ballast ballast, a battery, an electrodeless lamp;

Solar induction lamp ballast for real-time digital DC voltage u(k) of the photovoltaic cell obtained according to the detection. Real-time digital DC current acquires real-time digital power to obtain the maximum power reference point voltage of the solar cell, and performs solar energy on the real-time digital DC voltage Maximum output power tracking: According to the increase or decrease of real-time digital power, the pulse-width modulation is used to change the duty cycle of the driving signal ^; fc), and the real-time digital DC voltage is maintained or changed accordingly (the disturbance direction of W; when detecting When the DC voltage with the maximum output power is overvoltage, the pulse width modulation is used to change the duty cycle of the driving signal ^; fc) to reduce the real-time digital DC voltage. Further, according to |t/ _Rf - _W (fc)| > t/ _Rf is established, the real-time digital DC voltage variation Δ£/determines the drive signal duty cycle ^; fc) duty cycle step; the obtained DC voltage with the maximum output power is sent to the battery; Preset maximum duty cycle step size

A _max and minimum duty cycle step _mm .

 The battery, on the one hand, is used to store the DC voltage with the maximum output power sent by the solar electrodeless ballast; on the other hand, it is used to send its own stored electrical energy to the electrodeless lamp.

 An electrodeless lamp for converting electrical energy transmitted by a battery into magnetic energy to drive the lamp to emit light in the form of an alternating magnetic field.

In summary, the method for solar energy maximum power tracking control according to the present invention is based on the obtained solar energy maximum power reference point; when the real-time digital power of the solar cell is increasing, the pulse width is adopted. The modulation changes the duty ratio of the driving signal to keep the disturbance direction of the real-time digital DC voltage unchanged. When the real-time digital power of the solar cell is decreasing, the pulse-width modulation is used to change the duty ratio of the driving signal to change the real-time digital DC voltage. The direction of the disturbance; further, the method of changing the duty cycle of the driving signal is realized by adjusting the duty cycle step according to the variation of the real-time digital DC voltage: The variation of the real-time digital DC voltage is different, and the duty cycle step is different. The duty cycle is changed by changing the duty cycle step to adjust the real-time digital DC voltage in real time to achieve tracking with maximum solar power. Since the present invention adjusts the duty cycle step according to the amount of change of the real-time digital DC voltage, the present invention has the characteristics of high output efficiency, good tracking effect, and low cost. In the electrodeless lamp system with solar energy maximum power tracking control, the solar electrodeless lamp ballast adopts the method of solar maximum power tracking control according to the invention to real-time adjust the real-time digital DC voltage to obtain the maximum power of solar energy. DC voltage, and the finally obtained DC voltage is sent to the electrodeless lamp through the grid-connected inverter or battery; therefore, the electrodeless lamp system with solar maximum power tracking control of the invention also has high output efficiency and good tracking effect. , low cost features.

DRAWINGS

 1 is a schematic flow chart of a method for controlling maximum power tracking of solar energy according to the present invention; FIG. 2 is a schematic diagram showing an output characteristic curve of a photovoltaic cell according to the present invention;

 3 is a first structural schematic view of an electrodeless lamp system with solar energy maximum power tracking control according to the present invention;

 4 is a second structural schematic diagram of an electrodeless lamp system with solar energy maximum power tracking control according to the present invention;

5 is a schematic structural diagram of a solar energy ballast ballast with solar energy maximum power tracking control according to the present invention; 6 is a schematic structural diagram of a structure of the single chip microcomputer according to the present invention;

 7 is a schematic structural diagram of a DC/DC converter according to the present invention;

 FIG. 8 is a schematic structural diagram of a Buck-Boost circuit according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION The present invention will be further described in detail below with reference to the drawings and specific embodiments.

 1 is a schematic flow chart of a method for solar energy maximum power tracking control according to the present invention. As shown in FIG. 1, the method for solar energy maximum power tracking control according to the present invention comprises the following steps:

Step 1. According to the open circuit voltage of the solar cell, obtain the maximum power reference point voltage u _RF = ie% u _oc ; where t/. _c is the open circuit voltage of the solar cell.

 Step 2. According to the detected real-time digital DC voltage of the solar cell and the real-time digital DC current, obtain the real-time digital power of the solar cell, which is a natural number.

 Step 3. Compare /^) > /^ - 1) Is it true: If yes, go to step 4; if not, go to step 5.

 Step 4: using pulse width modulation to change the duty cycle of the driving signal ^; fc), keeping the disturbance direction of the real-time digital DC voltage unchanged: maintaining the duty cycle of the driving signal ^; fc) is increasing or decreasing; Step 6.

Here, the disturbance direction of the real-time digital DC voltage is kept unchanged: If the real-time digital DC voltage φ - 1) is increased at the previous moment, the pulse-width modulation is used to change the duty cycle of the drive signal q (k) to maintain the real-time number. The DC voltage is increased; if the real-time digital DC voltage u(k - 1) is decreased at the previous moment, the real-time digital DC voltage u(k) is kept decreasing by using pulse width modulation to change the duty ratio of the driving signal. . Step 5: using pulse width modulation to change the duty cycle of the driving signal ^; fc), changing the disturbance direction of the real-time digital DC voltage: changing the duty ratio of the driving signal ^^^ to the increasing state of the driving signal q<J is a reduced state; a state in which the duty ratio q<J of the drive signal is decreased is changed to a duty ratio of the drive signal ^; fc) is an increased state; thereafter, step 6 is performed.

Here, the disturbance direction of changing the real-time digital DC voltage is: If the real-time digital DC voltage φ - 1) is increased at the previous moment, the pulse-width modulation is used to change the duty cycle of the drive signal q (k) to reduce the real-time digital DC voltage. If the real-time digital DC voltage M(fc-1) is reduced at the previous moment, the pulse-width modulation is used to change the duty cycle q of the drive signal (Jc increases the real-time digital DC voltage u(k, step 6. judgment) t/ _Rf - _W (fc)|> t/ _Rf holds: If yes, go to step 7; if not, go to step 8.

Step 7. Adjust the duty cycle step according to the amount of change of the real-time digital DC voltage Δ£/: When j _RF <Au<^U _RF , keep the duty cycle step constant; when Δ£/ > ί^, subtract Small duty cycle step size Δ, and Δί7 = Δί7 - Δ; when Δϋ < ^〃, the booster duty cycle step size Δ, and Δί7 = Δί7 + Δ;

 8 where Δ is the amount of change in the duty cycle step Δ; then, go to step 9.

 Step 8. According to the amount of change of the real-time digital DC voltage Δ£/ adjust the duty cycle step:

—U _RF <Au<—U _RF , keeping the duty cycle step Δ constant; when Δ£/ > 1 ί ^, reduce the duty 32 16 16 ^RF ratio step size Δ , and Δί / = Δί / - Δ ; when <丄ί ^, increase the duty cycle step size Δ, and

 32

Ag = Ag + Α; After that, go to step 9.

Step 9. The duty ratio of the driving signal determined according to the duty cycle step Δ^; fc); adjusting the real-time digital DC voltage according to the duty ratio of the driving signal ^; fc) to achieve the maximum power tracking of the solar energy. In summary, the control method with solar maximum power tracking of the present invention first obtains the maximum power reference point of the solar cell; secondly, when the real-time digital power of the solar cell is increasing, the pulse width modulation is used to change the duty ratio of the driving signal, Keeping the disturbance direction of the real-time digital DC voltage unchanged; when the real-time digital power of the solar cell is decreasing, the pulse width modulation is used to change the duty ratio of the driving signal, and the disturbance direction of the real-time digital DC voltage is changed; further, the driving signal is changed. The method of the air ratio is realized by adjusting the duty cycle step according to the change amount of the real-time digital DC voltage: The change amount of the real-time digital DC voltage is different, and the duty cycle step is different. Real-time digital DC voltage is adjusted in real time by changing the duty cycle step by changing the duty cycle: that is, increasing the duty cycle of the drive signal can increase the real-time digital DC voltage; reducing the duty cycle of the drive signal, The real-time digital DC voltage can be reduced; thus, the pulse-width modulated real-time digital DC voltage can track the maximum power reference point voltage to achieve tracking with maximum solar power. Since the present invention adjusts the duty cycle step according to the amount of change of the real-time digital DC voltage, the present invention has the characteristics of high output efficiency, good tracking effect, and low cost.

2 is a schematic view showing an output characteristic curve of a photovoltaic cell in the present invention. As shown in Fig. 2, in practical applications, the output of the solar photovoltaic cell corresponds to different characteristic curves under different illumination conditions; the trajectory of the maximum power point of the solar photovoltaic cell is close to the power trajectory at a constant voltage of the photovoltaic cell. In practical applications, the open circuit voltage i/ is taken. 76% of _c is the voltage at the maximum power point of the solar photovoltaic cell.

 In the method of the present invention, before step 1, the method further includes:

 Step a. Set the initial value of the duty cycle step Δ to 5%.

Step b, preset maximum duty cycle step size A _max and minimum duty cycle step size A _min

 Maximum duty cycle step size The minimum duty cycle step size can be designed according to the actual situation. For example, the minimum duty cycle step can be selected as 1%.

In the method of the present invention, the amount of change Δ of the duty cycle step is the minimum duty step step _min . In practical applications, after step 9, it also includes:

Step 10: When an overvoltage occurs in the tracking voltage with the maximum solar power, the dynamic signal duty ratio ^fc) decreases, and the variation Δ of the duty cycle step Δ is the maximum duty cycle step A _max . FIG. 3 is a schematic diagram showing the first composition structure of the electrodeless lamp system with solar maximum power tracking control according to the present invention. As shown in FIG. 3, the electrodeless lamp system with solar maximum power tracking control of the present invention includes a solar electrodeless lamp ballast 1, a grid-connected inverter 2, an electrodeless lamp 3;

Solar induction lamp ballast 1 for real-time digital DC voltage u(k) of the photovoltaic cell obtained according to the detection. Real-time digital DC current acquires real-time digital power to obtain the maximum power reference point voltage of the solar cell, and performs real-time digital DC voltage Solar maximum output power tracking: According to the increase or decrease of real-time digital power, the pulse width modulation is used to change the duty cycle of the driving signal ^; fc), and the disturbance direction of the real-time digital DC voltage (fc) is maintained or changed accordingly; When it is detected that the DC voltage with the maximum output power is overvoltage, the pulse width modulation is used to change the duty cycle of the driving signal ^; fc) to reduce the real-time digital DC voltage. Further, according to |t/ _Rf - _W (fc ) >> Whether t/ _Rf is established, the amount of change of the real-time digital DC voltage Δ^; determining the duty cycle step of the duty cycle of the drive signal ^; fc); sending the obtained DC voltage with the maximum output power to the grid Inverter 2; also used to preset the maximum duty cycle step leg and the minimum duty cycle step 匪.

 The grid-connected inverter 2 is configured to convert the DC voltage with the maximum output power sent by the solar electrodeless lamp ballast 1 into an AC voltage of the same frequency and in phase with the grid, and then send the AC voltage to the electrodeless lamp 3 .

 The electrodeless lamp 3 is used for converting the AC voltage sent by the grid-connected inverter 2 into electric energy, and driving the lamp to emit light in the form of an alternating magnetic field.

4 is a schematic view showing a second composition structure of an electrodeless lamp system with solar energy maximum power tracking control according to the present invention. As shown in FIG. 4, the present invention has the maximum power tracking control of solar energy The lamp system comprises a solar energy ballast ballast 1, a battery 4, an electrodeless lamp 3;

Solar induction lamp ballast 1 for real-time digital DC voltage u(k) of the photovoltaic cell obtained according to the detection. Real-time digital DC current acquires real-time digital power to obtain the maximum power reference point voltage of the solar cell, and performs real-time digital DC voltage Solar maximum output power tracking: According to the increase or decrease of real-time digital power, the pulse width modulation is used to change the duty cycle of the driving signal ^; fc), and the disturbance direction of the real-time digital DC voltage (fc) is maintained or changed accordingly; When it is detected that the DC voltage with the maximum output power is overvoltage, the pulse width modulation is used to change the duty cycle of the driving signal ^; fc) to reduce the real-time digital DC voltage. Further, according to |t/ _Rf - _W (fc ) | > Whether t/ _Rf is established, the amount of change of the real-time digital DC voltage Δ^; determining the duty cycle step of the duty cycle of the drive signal ^; fc); sending the obtained DC voltage with the maximum output power to the battery 4 Also used to preset the maximum duty cycle step size A _max and the minimum duty cycle step size _mm .

 The battery 4, on the one hand, is used to store the DC voltage of the maximum output power transmitted by the solar electrodeless ballast 1; on the other hand, it is used to transmit its own stored electrical energy to the electrodeless lamp 3.

 The electrodeless lamp 3 is used for converting the electric energy sent by the battery 4 into magnetic energy, and driving the lamp to emit light in the form of an alternating magnetic field.

In summary, in the first and second solutions of the electrodeless lamp system with solar maximum power tracking control, the solar energy electrodeless ballast first obtains the solar maximum power reference point; when the real-time digital power of the solar cell increases The pulse width modulation is used to change the duty ratio of the driving signal, and the disturbance direction of the real-time digital DC voltage is kept unchanged; when the real-time digital power of the solar battery is decreasing, the pulse width modulation is used to change the duty ratio of the driving signal, and the mode is changed. The direction of disturbance of the real-time digital DC voltage; further, the method of changing the duty cycle of the drive signal is based on whether |t/ _Rf - _W (fc)| > lf/ _Rf holds, Real-time digital DC voltage change by adjusting the duty cycle step: Real-time digital DC voltage varies, the duty cycle step is different; change the duty cycle step to change the duty cycle, thus real-time The digital DC voltage is adjusted in real time to obtain a DC voltage with maximum solar power. The grid-connected inverter or battery adds a DC voltage with maximum solar power to the electrodeless lamp to realize an electrodeless lamp system with maximum solar power tracking control. Because the invention adjusts the duty cycle step according to the variation of the real-time digital DC voltage to realize the maximum power tracking of the solar energy, the invention has the characteristics of high output efficiency, good tracking effect and low cost.

 FIG. 5 is a schematic structural diagram of a solar energy ballast ballast with solar energy maximum power tracking control according to the present invention. As shown in FIG. 5, in the electrodeless lamp system with solar maximum power tracking control, the solar electrodeless ballast 1 includes a DC/DC converter 11, a detection module 12, a control module 13, a driving module 14, and a protection module 15; ,

 The DC/DC converter 11 is configured to perform input filtering on the real-time analog DC voltage outputted by the photovoltaic cell, perform pulse width modulation processing under the control of the driving voltage sent by the driving module 14, and perform output filtering on the obtained DC ripple voltage. After the processing, the obtained filtered DC ripple voltage is sent to the protection module 15, the grid-connected inverter 2 or the battery 4.

 The detecting module 12 is configured to send the real-time analog DC voltage Μ(ί) and the real-time analog DC current 0 of the detected photovoltaic cell output to the control module 13.

The control module 13 is configured to preset a maximum duty cycle step size _max and a minimum duty cycle step _min ; for detecting an adjustment signal sent by the protection module 15; when the adjustment signal sent by the protection module 15 is not detected, acquiring the solar energy The maximum power reference point voltage of the battery, and according to the real-time analog DC voltage sent by the detection module 12 (the real-time digital DC voltage obtained by analog-to-digital conversion of the real-time analog DC current 0), real-time digital DC current to obtain real-time digital Power based on real-time digital work Increasing or decreasing the rate, using pulse width modulation to change the duty cycle of the driving signal ^; fc), correspondingly maintaining or changing the disturbance direction of the real-time digital DC voltage; further, according to |t/ _Rf - u(k ) \ > ^ U _RF is true, the real-time digital DC voltage u (the amount of change of k Δ£ / the duty cycle step of determining the duty cycle of the drive signal; when the adjustment signal sent by the protection module 15 is detected, the maximum The duty cycle step _max reduces the duty ratio ^; fc) ; the duty cycle step is sent to the drive module 14 as a drive control signal.

 The driving module 14 transmits a driving signal obtained by boosting the driving control signal sent from the control module 13 to the DC/DC converter 11.

 In the actual application, the driving module 14 is a prior art, and details are not described herein again.

 The protection module 15 is configured to detect a DC voltage having a maximum output power outputted by the DC/DC converter 11, and generate an adjustment signal when the DC voltage having the maximum output power is overvoltage; and send the adjustment signal to the control module 13.

 In the present invention, the control module 13 is a single chip microcomputer. Fig. 6 is a schematic view showing the structure of a single chip microcomputer according to the present invention. As shown in FIG. 6, the single chip microcomputer includes an analog/digital conversion unit 1311, an input/output unit 1312, and a central processing unit 1313;

 The analog/digital conversion unit 1311 is configured to perform real-time digital DC voltage M(fc) after performing analog/digital conversion on the real-time analog DC voltage ί(ί) and real-time analog DC current (ί) sent by the detection module 12, The real-time digital direct current (fc) is sent to the central processing unit 1313.

 The input/output unit 1312 is configured to forward the adjustment signal sent by the protection module 15 to the central processing unit 1313.

The central processing unit 1313 is configured to preset a maximum duty cycle step and a minimum duty step for detecting an adjustment signal sent by the input/output unit 1312; when the adjustment signal sent by the input/output unit 1312 is not detected. , obtain the maximum power reference point voltage of the solar cell, according to analog/digital conversion The real-time digital DC voltage (fc) sent by the unit 1311 and the real-time digital DC current obtain real-time digital power according to the increase or decrease of the real-time digital power, and the pulse width modulation is used to change the duty ratio of the driving signal ^; fc), correspondingly Maintaining or changing the disturbance direction of the real-time digital DC voltage; further, determining whether the duty ratio of the real-time digital DC voltage is Δ£/ according to whether |t/ _Rf - W| > t/ _Rf is established; fc) The duty cycle step size Δ^; when the adjustment signal sent by the input/output unit 1312 is detected, the duty ratio is reduced by the maximum duty cycle step; fc); the duty cycle step is used as the drive The control signal is sent to the drive module 14.

 Fig. 7 is a schematic view showing the structure of a DC/DC converter according to the present invention. As shown in FIG. 7, the DC/DC converter 11 of the present invention includes an input filter circuit 111, a Buck-Boost circuit 112, and an output filter circuit 113;

 The input filter circuit 111 is configured to perform input filtering processing on the real-time analog DC voltage outputted by the photovoltaic cell, and send the obtained input filter voltage to the Buck-Boost circuit 112.

 The Buck-Boost circuit 112 is configured to control the on-time or the off-time of the input filter voltage according to the driving voltage sent by the driving module 14, to obtain a DC ripple voltage, and send the DC ripple voltage to the output filter circuit 113.

 The output filter circuit 113 is configured to perform output filtering processing on the DC ripple voltage sent by the Buck-Boost circuit 112, and send the obtained DC voltage having the maximum output power to the protection module 15, the grid-connected inverter 2 or the battery 4.

FIG. 8 is a schematic structural diagram of a Buck-Boost circuit according to the present invention. As shown in FIG. 8, the Buck-Boost circuit 112 includes a FET VS, a storage inductor L, an output diode VD1, a storage capacitor 〇, and a fast recovery diode VD2. The storage inductor output diode VD1 and the storage capacitor C are formed. DC filter circuit; the gate G of the FET VS is connected to the output end of the driving module 14, field effect The source of the VS is connected to the anode of the photovoltaic cell, and the drain of the FET VS is simultaneously connected to the end of the storage inductor L and the cathode of the output diode VD1; the anode of the output diode VD1 serves as the output of the Buck-Boost circuit 112. The negative terminal is connected to the negative terminal of the input terminal of the output filter circuit 113, and the negative electrode of the storage capacitor C is connected to the negative electrode. The negative terminal of the photovoltaic cell, the other end of the storage inductor L, and the positive terminal of the storage capacitor C are all connected to the output filter circuit 113. The input terminal is positive; a fast recovery diode VD2 is connected between the source of the FET VS and the drain of the FET VS, and the source of the FET VS is connected to the cathode of the fast recovery diode VD2, the FET VS The drain is connected to the anode of the fast recovery diode VD2.

 The field effect transistor VS is configured to be turned on or off under the control of the driving signal sent by the driving module 14, and obtain an initial pulse width modulation voltage according to the on time or the off time; and send the initial pulse width modulation voltage to the direct current Filter circuit

 A DC filter circuit is used to filter the initial pulse width modulation voltage sent by the FET VS to obtain a DC ripple voltage.

 In the above invention, the disturbance direction of the real-time digital DC voltage is kept unchanged: if the real-time digital DC voltage φ - 1) is increased at the previous moment, the pulse width modulation is used to change the duty cycle of the drive signal fc) The real-time digital DC voltage is increased; if the real-time digital DC voltage -1) is reduced at the previous moment, the real-time digital DC voltage is continuously reduced by using pulse width modulation to change the duty ratio of the driving signal.

In the above invention, the disturbance direction of the real-time digital DC voltage is changed as follows: If the real-time digital DC voltage φ - 1) is increased at the previous moment, the pulse width modulation is used to change the duty cycle of the drive signal q (k) to reduce the real-time. Digital DC voltage If the real-time digital DC voltage M(fc - l) is reduced at the previous moment, the real-time digital DC power is increased by using pulse width modulation to change the duty cycle q(c) of the drive signal. J^u(k). In the above summary, according to whether \U _RF - u(k)\ > ^U _RF is established, the real-time digital DC voltage u (the amount of change of k Δ£ / determines the duty cycle step of the drive signal duty cycle q ( ) for:

- _M ( )|>丄 ^ ^ In the case of: When 丄i / _SF <ΔΜ <丄i / _SF , keep the duty cycle step 1 ¹ 4 8 4

Δ is invariant; when >丄, the duty cycle step is reduced by eight, HAg = Ag - A; when <丄,

 4 8 increase the duty cycle step size Δ , = Ag + A; where Δ is the amount of change in the duty cycle step Δ;

|t/ _Rf - _W (fc)|>if/ _Rf does not hold: When 丄i/ _SF <ΔΜ<丄i/ _SF , keep the duty ratio

 4 32 16 step size Δ constant; when Δ" > 丄 ί ^, reduce the duty cycle step size Δ, HAg = Ag - A

 16

Au < — U _RF , increase the duty cycle step size Δ , = AQ + A] where Δ is the duty cycle step size Δ

The amount of change in 32.

 In conclusion, the above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

claims 1. A method with solar maximum power tracking control, characterized in that the control method includes the following steps: Step 1. According to the open circuit voltage of the solar cell, obtain the maximum power reference point voltage u _RF = ie%u _oc ; where, t/. _c is the open circuit voltage of the solar cell; Step 2. According to the detected real-time digital DC voltage and real-time digital DC current (fc) of the solar cell, obtain the real-time digital power P t) of the solar cell; where is a natural number; Step 3. Compare P ^o ^fc- 1) Whether it is true: If true, go to step 4; if not true, go to step 5; Step 4. Use pulse width modulation to change the duty cycle of the drive signal fc) to keep the disturbance direction of the real-time digital DC voltage unchanged: Keep the duty cycle of the drive signal fc) to increase or decrease; after that, execute Step 6 Step 5. Use pulse width modulation to change the driving signal duty cycle ^; fc) to change the disturbance direction of the real-time digital DC voltage: change the driving signal duty cycle ^; ^) to the state where the driving signal duty cycle is increasing to the driving signal duty cycle q<J is a decreasing state; change the driving signal duty cycle q<J is a decreasing state to a driving signal duty cycle^; fc) is an increasing state; After that, perform step 6; Step 6. Judgment | t/ _Rf - _W (fc)|> Is t/ _Rf true? If true, go to step 7; if not true, go to step 8; Step 7. Adjust the duty cycle step size according to the change of the real-time digital DC voltage Δ£/ ^U _RF <Au<^U _RF H, keep the duty cycle step size unchanged; when Δ£/ > ί^, reduce the duty cycle step size Δ, 3-Ag = Ag - A; when Δϋ < ^ 〃, when the duty cycle step size of the force increasing port is Δ, Hag = Ag + A; Among them, Δ is the change of the duty cycle step size Δ; after that, perform step 9; Step 8. Adjust the duty cycle step size according to the change of the real-time digital DC voltage Δ£/ —U _RF <Au<—U _RF , keep the duty cycle step size Δ unchanged; when Δ£/ > 1ί ^, reduce the duty cycle step size Δ to 32 16 16 ^RF , and Δί/ = Δί/ - Δ ; When <丄ί ^, increase the duty cycle step size Δ, and 32 Ag = Ag + Α; After that, perform step 9; Step 9. Adjust the real-time digital DC voltage according to the duty cycle of the driving signal determined by the duty cycle step Δ; fc); adjust the real-time digital DC voltage according to the duty cycle of the driving signal to achieve maximum solar power tracking. 2. The method with solar maximum power tracking control according to claim 1, characterized in that, before step 1, it also includes: Step a. Set the initial value of the duty cycle step size Δ to 5%; Step b. Preset the maximum duty cycle step A _max and the minimum duty cycle step A _min . 3. An electrodeless lamp system with solar maximum power tracking control, characterized in that the electrodeless lamp system includes a solar electrodeless lamp ballast, a grid-connected inverter, and an electrodeless lamp; wherein, Solar electrodeless lamp ballast is used to obtain the real-time digital power of the solar cell based on the detected real-time digital DC voltage u(k) of the photovoltaic cell. The real-time digital DC current is used to obtain the maximum power reference point voltage of the solar cell, and the real-time digital DC voltage is measured. Maximum output power tracking: According to the increase or decrease of real-time digital power, pulse width modulation is used to change the duty cycle of the driving signal (fc), and the disturbance direction of the real-time digital DC voltage (fc) is maintained or changed accordingly; when When overvoltage is detected in the DC voltage with the maximum output power, pulse width modulation is used to change the duty cycle of the driving signal ^; fc) to reduce the real-time digital DC voltage further, according to |t/ _Rf - _W (fc) |> Whether t/ _Rf is established, the change amount of real-time digital DC voltage Δ^; determine the duty cycle step of the driving signal duty cycle^; fc); will get The DC voltage with maximum output power is sent to the grid-connected inverter; also used to preset the maximum duty cycle step length leg and the minimum duty cycle step length _mm; Grid-connected inverter is used to convert the DC voltage with maximum output power sent by the solar induction lamp ballast into an AC voltage of the same frequency and phase as the power grid, and then sends the AC voltage to the electrodeless lamp; Induction lamps are used to convert the AC voltage sent by the grid-connected inverter from electrical energy into magnetic energy, and drive the lamp to emit light in the form of an alternating magnetic field. 4. An electrodeless lamp system with solar maximum power tracking control, characterized in that the electrodeless lamp system includes a solar electrodeless lamp ballast, a battery, and an electrodeless lamp; wherein, Solar electrodeless lamp ballast is used to obtain the real-time digital DC voltage of the photovoltaic cell according to the detected real-time digital DC voltage u(k). The real-time digital DC current obtains the real-time digital power, obtains the maximum power reference point voltage of the solar cell, and performs solar energy calculation on the real-time digital DC voltage. Maximum output power tracking: According to the increase or decrease of real-time digital power, pulse width modulation is used to change the duty cycle of the driving signal (fc), and the disturbance direction of the real-time digital DC voltage (fc) is maintained or changed accordingly; when When overvoltage is detected in the DC voltage with the maximum output power, pulse width modulation is used to change the duty cycle of the driving signal ^; fc) to reduce the real-time digital DC voltage further, according to |t/ _Rf - _W (fc) | > Whether t/ _Rf is established, the change amount of the real-time digital DC voltage Δ£/ determines the duty cycle step of the driving signal duty cycle^; fc); sends the obtained DC voltage with the maximum output power to the battery; also Used to preset the maximum duty cycle step size A _max and the minimum duty cycle step size _min; The battery, on the one hand, is used to store the DC voltage with maximum output power sent by the solar induction lamp ballast; on the other hand, it is used to send its own stored electrical energy to the electrodeless lamp; Induction lamps are used to convert the electrical energy sent by the battery into magnetic energy, and drive the lamp to emit light in the form of an alternating magnetic field. 5. The electrodeless lamp system with solar maximum power tracking control according to claim 3 or 4, characterized in that the solar electrodeless lamp ballast includes a DC/DC converter, a detection module, a control module, a driving module, protection module; among them, DC/DC converter is used to input filter the real-time analog DC voltage output by the photovoltaic cell, perform pulse width modulation processing under the control of the driving voltage sent by the driving module, and perform output filtering processing on the obtained DC pulsating voltage. , sending the obtained DC voltage with maximum output power to the protection module, the grid-connected inverter or the battery; The detection module is used to send the detected real-time simulated DC voltage Μ(ί) and the real-time simulated DC current output by the photovoltaic cell to the control module; The control module is used to preset the maximum duty cycle step size _max and the minimum duty cycle step size _min ; used to detect the adjustment signal sent by the protection module; when the adjustment signal sent by the protection module is not detected, obtain the maximum value of the solar cell The power reference point voltage is obtained based on the real-time digital DC voltage u(k,, real-time digital DC current k) obtained by performing analog/digital conversion on the real-time analog DC voltage u(t) sent by the detection module and the real-time analog DC current 0 Real-time digital power pk); correspondingly maintain or change the driving signal duty cycle^; fc) according to the increase or decrease of real-time digital power), further, according to |t/ _Rf - _W (fc)| > [/ _Rf Whether it is established, the change amount Δ£/ of the real-time digital DC voltage u(k determines the duty cycle step of the driving signal duty cycle; when the adjustment signal sent by the protection module is detected, the maximum duty cycle step is reduced The small duty cycle sends the duty cycle step as a drive control signal to the drive module; The drive module is used to boost the drive control signal sent by the control module and send the drive signal obtained by the DC/DC converter; Protection module, used to detect the DC voltage with maximum output power output by the DC/DC converter. When the DC voltage with maximum output power overvoltages, an adjustment signal is generated; the adjustment signal is sent to the control module. 6. The electrodeless lamp system with solar maximum power tracking control according to claim 5, wherein the DC/DC converter includes an input filter circuit, a Buck-Boost circuit, and an output filter circuit; wherein, Input filtering circuit, used to perform input filtering processing on the real-time analog DC voltage output by the photovoltaic cell, and send the obtained input filtered voltage to the Buck-Boost circuit; Buck-Boost circuit, used to control the on-time or cut-off time of the input filter voltage according to the drive signal sent by the drive module to obtain the DC pulsating voltage; and send the DC pulsating voltage to the output filter circuit; The output filter circuit is used to perform output filtering processing on the DC pulsating voltage sent by the Buck-Boost circuit, and send the obtained DC voltage with maximum output power to the protection module, the grid-connected inverter or the battery. 7. The electrodeless lamp system with solar maximum power tracking control according to claim 6, characterized in that the Buck-Boost circuit includes a field effect transistor VS, an energy storage inductor L, an output diode VD1, and an energy storage capacitor 0, Fast recovery diode VD2; among them, the energy storage inductor L, the output diode VD1, and the energy storage capacitor C form a DC filter circuit; the gate G of the field effect transistor VS is connected to the output end of the driving circuit, and the source electrode of the field effect transistor VS is connected The positive electrode of the photovoltaic cell and the drain of the field effect transistor VS are simultaneously connected to one end of the energy storage inductor L and the cathode of the output diode VD1; on the one hand, the anode of the output diode VD1 serves as the negative electrode of the output terminal of the Buck-Boost circuit and is connected to the output filter. The negative electrode of the input terminal of the circuit, on the other hand, is connected to the negative electrode of the energy storage capacitor C; the negative electrode of the photovoltaic cell, the other end of the energy storage inductor L, and the positive electrode of the energy storage capacitor C are all connected to the positive electrode of the input terminal of the output filter circuit; field A fast recovery diode VD2 is also connected between the source of the effect transistor VS and the drain of the field effect transistor VS. The source of the field effect transistor VS The pole is connected to the cathode of the fast recovery diode VD2, and the drain of the field effect transistor VS is connected to the anode of the fast recovery diode VD2; The field effect transistor VS is used to turn on or off under the control of the drive signal sent by the drive circuit, and obtain the initial pulse width modulation voltage according to the on time or off time; and send the initial pulse width modulation voltage to DC filter circuit; The DC filter circuit is used to filter the initial pulse width modulation voltage sent by the field effect transistor VS to obtain the DC pulsating voltage. 8. The electrodeless lamp system with solar maximum power tracking control according to claim 5, characterized in that the control module is a single-chip microcomputer. 9. The electrodeless lamp system with solar maximum power tracking control according to claim 8, characterized in that the single-chip computer includes an analog/digital conversion unit, an input/output unit, and a central processor; wherein, the analog/digital conversion unit , used to perform analog/digital conversion on the real-time analog DC voltage _M (ί) and real-time analog DC current (ί) sent by the detection module, and then send the obtained real-time digital DC voltage M (fc) and real-time digital DC current. to central processing unit; Input/output unit, used to forward the adjustment signal sent by the protection module to the central processor; central processor, used to preset the maximum duty cycle step length and the minimum duty cycle step length; used to detect the input /Adjustment signal sent by the output unit; When the adjustment signal sent by the input/output unit is not detected, the maximum power reference point voltage of the solar cell is obtained, based on the real-time digital DC voltage (fc) sent by the analog-to-digital conversion unit, real-time digital The DC current obtains the real-time digital power and accordingly maintains or changes the driving signal duty cycle according to the increase or decrease of the real-time digital power^; fc), and further, whether |[/ _Rf - _W (fc)|> t/ _Rf Established, the change amount of the real-time digital DC voltage Δ£/ determines the duty cycle step of the driving signal duty cycle^; fc); when the adjustment signal sent by the input/output unit is detected, then The duty cycle is reduced by the maximum duty cycle step size A _max ; the duty cycle step size is sent to the drive module as a drive control signal. 10. The electrodeless lamp system with solar maximum power tracking control according to claim 3 or 4 or 9, characterized in that, whether the real-time number is true according to |[/ _Rf - _W (fc)|> [/ _Rf The change amount of DC voltage u(k) Δί/ determines the duty cycle step of the driving signal duty cycle q(k): |t/ _Rf - _W (fc)|>if/ _Rf is true: When 丄i/ _SF <ΔΜ〈丄i/ _SF , keep the duty cycle step size 1 ¹ 4 8 4 Δ remains unchanged; when >丄, reduce the duty cycle step size by eight, 3-Ag = Ag - A; when <丄, 4 8 Increase the duty cycle step size Δ, = Ag + A; where Δ is the change in the duty cycle step size Δ; |t/ _Rf - _W (fc)|>if/ _Rf does not hold: When 丄i/ _SF <ΔΜ〈丄i/ _SF , the duty cycle is maintained 4 32 16 The step size Δ remains unchanged; when Δ" >丄 ί ^, reduce the duty cycle step size Δ, HAg = Ag - A when 16 Au <—U _RF , increase the duty cycle step size Δ, = AQ + A] where Δ is the duty cycle step size Δ 32 changes.