TWI636635B - Solar power supply wireless power conversion system - Google Patents

Abstract

The invention relates to a solar-powered wireless power conversion system, which mainly comprises a switching circuit and a rectifier circuit with series resonance; thereby, the utility model has the advantages of small circuit size, light weight and low cost in the high frequency environment. And can have more flexibility to adjust the space, can achieve different properties of the converter, while having flexible switching characteristics, reducing the loss in the process, can greatly improve the overall conversion efficiency

Description

Solar powered wireless power conversion system

The invention relates to a solar-powered wireless power conversion system, in particular to an operation in a high-frequency environment, which has the characteristics of small circuit size, light weight and low cost, and can have more flexibility adjustment space and can achieve different The nature of the converter, while having flexible switching characteristics, reduces the loss during the process, can greatly improve the overall conversion efficiency, and more practical performance characteristics in its overall implementation.

In recent years, science and technology have been changing with each passing day. For the development of science and technology civilization, human beings consume the resources of nature at an extremely fast rate to obtain the energy we need. This process makes the limited resources gradually exhausted. Many wastes that harm the global environment have been created. Due to human demand for various energy sources, energy consumption continues to increase by 2 to 3% per year, causing the existing fossil energy on the planet to face depletion. However, the large amount of pollutants produced by the burning of fossil energy destroys the ozone layer in the atmosphere, causing the greenhouse effect to warm the global climate, natural disasters continue to occur, the environment is rapidly deteriorating; frequent wind disasters, Floods, various factors such as climate variability, changes in the natural environment, and the impact of environmental pollution on people's health.

In the current situation that all kinds of energy are gradually depleted, human beings must find new alternative energy sources, and this new energy must have inexhaustible characteristics. Therefore, it is a top priority to actively seek new energy sources to solve this crisis. At present, many advanced countries have invested in the development and utilization of renewable energy (Renewable Energy). In terms of natural conditions, renewable energy that may be put into practical use has solar, wind, tidal, geothermal, biomass and so on. Energy, which is most suitable for solar photovoltaic conversion; this kind of energy conversion system, the most important is solar power system that converts solar energy into electric energy by solar cells, and the input sunlight is unlimited as long as the weather conditions are good. There is no need for any energy costs. Due to the lack of self-produced energy in Taiwan, it must rely on energy imports. Due to the geographical advantage of Taiwan, the amount of sunshine is quite abundant and the sunshine time is long. It is quite suitable for solar power generation, and solar energy has zero pollution and pollution-free characteristics. The most promising renewable energy in the century.

In view of this, the inventor has provided a solar-powered wireless power conversion system for the purpose of achieving better practical value by adhering to the rich experience in design, development and actual production of the relevant industry for many years, and researching and improving the existing structure and defects. The purpose of the person.

The main purpose of the present invention is to provide a solar powered wireless power conversion The system is mainly operated in a high-frequency environment, and has the characteristics of small circuit size, light weight and low cost, and can have more flexibility adjustment space, can realize converters with different properties, and has flexible switching characteristics. The loss in the process is reduced, and the overall conversion efficiency can be greatly improved, and the utility model is more effective in its overall implementation.

The main purpose and effect of the solar-powered wireless power conversion system of the present invention are achieved by the following specific technical means: the main system includes a switching circuit and a rectifier circuit with series resonance; wherein: the switching circuit is connected to the input voltage V. _{The dc} positive terminal is respectively connected to the first end of the first power switch S _{1 and} the first end of the third power switch S ₃ , and the second end of the first power switch S ₁ and the fourth power switch S ₄ are connected The first end is connected, and the second end of the third power switch S ₃ is connected to the first end of the second power switch S ₂ , and the input voltage V _dc negative end is respectively connected to the fourth power switch _{S. 4} of the second terminal and the second power switch S ₂ of a second end connected to the other _{S. 3} of the third power switch connected between a second end of the first end of the second power switch S ₂ and have the primary-side resonant capacitor C _r1 of a first end, a second end of the primary side resonance capacitor C _r1 of the first end of the primary-side resonant inductor L _r1 of the connector, and the second end of the primary-side resonant inductor L _r1 of the connection the first to the second terminal of power switch S ₁ and the fourth of the power _{switch. 4} S Between one end; the rectifier circuit based on the secondary-side resonant inductor L _r2 of the first end is connected to a first end of the resonant capacitor C _r2 of the secondary side, a second terminal of the secondary-side resonant capacitor C _r2 of respectively The second end of the first diode D _{1 and} the first end of the second diode D _{2 are} connected, and the second end of the secondary side resonant inductor L _r2 is respectively connected with the second end of the first capacitor C ₁ The first end of the second capacitor C ₂ is connected, and the first end of the first diode D _{1 and} the first end of the first capacitor C ₁ are connected to the first end of the output filter capacitor C _O And the second end of the second diode D _{2 and} the second end of the second capacitor C ₂ are connected to the second end of the output filter capacitor C _{O and} the second end of the load; The primary side resonance inductor L _r1 , the primary side resonance capacitor C _{r1 ,} and the secondary side resonance inductor L _r2 and the secondary side resonance capacitor C _r2 generate series resonance.

A preferred embodiment of the solar-powered wireless power conversion system of the present invention further includes a solar photovoltaic array (PV Array), a maximum power tracking system, and a single wafer; the solar photovoltaic array is composed of a plurality of solar photovoltaic modules. a combination of the PV modules, the maximum power tracking system is connected to the output end of the solar photovoltaic array, and the single wafer is connected to the maximum power tracking system, and the single wafer receives the solar photovoltaic array. And detecting, by the feedback circuit provided by the maximum power tracking system, a trigger signal is transmitted to the maximum power tracking system, and the maximum power tracking system outputs an appropriate voltage V _dc to the connected switching circuit. The input terminal causes the switching circuit to generate a high-frequency alternating magnetic field, which is coupled to the rectifier circuit via air, and the rectifier circuit is used to supply the rectified DC power to the connected load.

A preferred embodiment of the solar powered wireless power conversion system of the present invention, wherein the feedback circuit is provided with a Hall sensor for current detection.

(1) ‧‧‧Solar Photovoltaic Array

(11)‧‧‧Solar photovoltaic modules

(2) ‧‧‧Maximum power tracking system

(3) ‧ ‧ single chip

(31)‧‧‧Responsive circuit

(311)‧‧‧ Hall Sensor

(4) ‧‧‧Switching circuit

(5) ‧‧‧Rectifier circuit

(6) ‧ ‧ load

First: Schematic diagram of the system architecture of the present invention

Second picture: schematic diagram of the circuit of the present invention

Third figure: Timing diagram of the present invention

Fourth: Schematic diagram of an equivalent circuit of the working mode of the present invention

Figure 5: Schematic diagram of the equivalent circuit of the working mode of the present invention

Figure 6: Schematic diagram of the three equivalent circuit of the working mode of the present invention

Figure 7: Schematic diagram of the four equivalent circuit of the working mode of the present invention

Figure 8: Schematic diagram of the five equivalent circuit of the working mode of the present invention

Ninth diagram: schematic diagram of the equivalent circuit of the working mode of the present invention

The tenth figure: the measured waveforms of the driving voltage signal and the switching voltage of the first and second power switches of the present invention

Figure 11: Analog waveform diagram of the first and second power switch driving voltage signals and switching voltages of the present invention

Twelfth figure: The measured waveforms of the driving voltage signal and the switching voltage of the third and fourth power switches of the present invention

Thirteenth figure: analog waveform diagram of driving voltage signal and switching voltage of the third and fourth power switches of the present invention

Figure 14: The measured waveforms of the first and second power switch switching voltages and the current flowing through the switch of the present invention

The fifteenth figure: the first and second power switch switching voltages of the present invention and the flow waveforms through the switch current

Figure 16: The measured voltage of the third and fourth power switch switching voltages and the current through the switch current of the present invention

Figure 17: Analog waveform diagram of the third and fourth power switch voltages and currents flowing through the switch of the present invention

Figure 18: The measured waveform of the primary side resonant capacitor voltage and current of the present invention

Figure 19: Analog waveform diagram of the primary side resonant capacitor voltage and current of the present invention

Figure 20: The measured waveform of the primary side resonant inductor voltage and current of the present invention

Twenty-first graph: analog waveform diagram of the primary side resonant inductor voltage and current of the present invention

Twenty-second graph: the measured waveform of the voltage and current of the primary side resonant tank of the present invention

Twenty-third graph: analog waveform diagram of voltage and current of the primary side resonant tank of the present invention

Figure 24: The measured waveform of the secondary side resonant inductor voltage and current of the present invention

Figure 25: Analog waveform diagram of the secondary side resonant inductor voltage and current of the present invention

Figure 26: The measured waveform of the secondary side resonant capacitor voltage and current of the present invention

Figure 27: Analog waveform diagram of the secondary side resonance capacitor voltage and current of the present invention

Twenty-eighth Figure: The measured waveform of the voltage and current of the secondary side resonant tank of the present invention

Twenty-ninth Figure: Analog waveform diagram of voltage and current of the secondary side resonant tank of the present invention

Thirty-fifth: the measured waveform of the first diode of the present invention

Thirty-first graph: analog waveform diagram of voltage and current of the first diode of the present invention

Figure 32: Measured waveform of voltage and current of the second diode of the present invention

Thirty-third figure: analog waveform diagram of voltage and current of the second diode of the present invention

Figure 34: The measured waveform of the first capacitor voltage and current of the present invention

Figure 35: Analog waveform diagram of the first capacitor voltage and current of the present invention

Figure 36: The measured waveform of the second capacitor voltage and current of the present invention

Figure 37: Analog waveform diagram of the second capacitor voltage and current of the present invention

Thirty-eighth Figure: Actual measured waveform of output voltage and output current of the present invention

Thirty-ninth Figure: Analog waveform diagram of output voltage and output current of the present invention

40th map: The measured efficiency curve of the present invention with different input voltages under the condition of fixed load resistance

For a more complete and clear disclosure of the technical content, the purpose of the invention and the effects thereof achieved by the present invention, the following is a detailed description, and please refer to the drawings and drawings: First, please refer to 1 is a schematic diagram of a system architecture of the present invention. The present invention mainly includes a solar photovoltaic array (PV Array) (1), a maximum power tracking system (2), a single chip (3), a switching circuit (4), Rectifier circuit (5), load (6); the solar photovoltaic array (1) is composed of several pieces of solar photovoltaic module (PV) (11) in series and parallel, and the solar photovoltaic The output of the electrical array (1) is connected to the maximum power tracking system (2), and the single chip (3) is connected to the maximum power tracking system (2), and the single chip (3) receives the solar photovoltaic The voltage and current data detected by the feedback circuit (31) connected between the electrical array (1) and the maximum power tracking system (2), and the Hall sensor is provided in the feedback circuit (31) [Hall Sensor] (311) is used for current detection, so that the feedback circuit (31) detects the solar photovoltaic array Column (1) outputs voltage and current data, and then generates a trigger signal via the single chip (3), transmits the signal to the maximum power tracking system (2), and calculates to generate a trigger signal for transmission to the maximum power tracking system (2), Having the maximum power tracking system (2) output an appropriate voltage V _dc to the input end of the connected switching circuit (4), causing the switching circuit (4) to generate a high frequency alternating magnetic field via the high frequency alternating magnetic field The air will be coupled to the rectifier circuit (5), and the rectifier circuit (5) is used to supply the rectified DC power to the connected load (6); please refer to the second schematic diagram of the circuit diagram of the present invention. shown, wherein: the switching circuit (4), which system (2) to the input of the maximum power point tracking system voltage V _dc, respectively the positive terminal of the first power switch S ₁ and the third terminal of the first power switch _{S. 3} of The first end is connected, and the second end of the first power switch S ₁ is connected to the first end of the fourth power switch S ₄ , and the second end of the third power switch S ₃ and the second power are connected The first end of the switch S ₂ is connected, and the voltage V input by the maximum power tracking system (2) _{The dc} negative terminal is respectively connected to the second end of the fourth power switch S _{4 and} the second end of the second power switch S _{2 , and} the second end of the third power switch S ₃ and the second power a first end connected to a primary side resonance capacitor C _r1 between the first terminal of the switch S _2, a second terminal of the primary side resonance capacitor C _r1 of a first end connected to the primary side of the resonant inductor L _r1, and the time The second end of the side resonant inductor L _r1 is connected between the second end of the first power switch S _{1 and} the first end of the fourth power switch S ₄ .

The rectifying circuit (5) is connected to a first end of the secondary side resonant capacitor C _r2 at a first end of the secondary side resonant inductor L _r2 , and the second end of the secondary side resonant capacitor C _r2 is respectively The second end of the diode D _{1 and} the first end of the second diode D _{2 are} connected, and the second end of the secondary side resonant inductor L _r2 is respectively connected to the second end of the first capacitor C ₁ The first end of the second capacitor C ₂ is connected, and the first end of the first diode D _{1 and} the first end of the first capacitor C ₁ are connected to the first end of the output filter capacitor C _O The second end of the second diode D _{2 and} the second end of the second capacitor C ₂ are connected to the second end of the output filter capacitor C _{O and} the second end of the load.

In this way, the operating voltage and power of the solar photovoltaic array (1) are not fixed, and the solar photovoltaic array (PV) is changed according to the change of the sunlight intensity, so that the solar energy is utilized. The maximum power tracking system (2) connected to the output end of the photovoltaic array (1) for optimal use of the solar photovoltaic array (1), and receiving the feedback circuit by using the single chip (3) (31) The detected voltage and current data are calculated to generate a trigger signal for transmission to the maximum power tracking system (2), and the maximum power tracking system (2) outputs an appropriate voltage V _dc to the connected switch. input of the circuit (4), which switching circuit (4) by using the first power switches S _1, the second power switch S _2, the third power switch S _3, S ₄ of the fourth power switch composed of a bridge rectifier Converting the DC voltage V _dc into a square wave signal, operating in a zero voltage switching state, converting the square wave voltage into the high frequency sinusoidal voltage and current via the primary side resonant inductor L _r1 and the primary side resonant capacitor C _r1 , the high frequency Sine wave current flows through the primary side Vibration inductor L _r1 generates high frequency alternating magnetic field, this will be a high-frequency alternating magnetic field coupled to the rectifier circuit (5) of the secondary-side resonant inductor L _r2 via the air, then the secondary side L _r2 resonant inductor A high-frequency AC voltage is induced, and the DC power rectified by the high-frequency AC voltage is supplied to the load.

Referring to the third diagram of the present invention as shown in the timing chart, the present invention is divided into six working modes for analysis and discussion:

Working mode one [t ₀ t t ₁ 〕: Please refer to the fourth diagram of the working mode of the present invention as shown in the equivalent circuit diagram. In this mode of operation, the driving signal V of the first power switch S ₁ and the second power switch S _{2 Gs1} and V _{gs2 are} at a high level. At this time, the current i _Lr1 of the primary side resonance inductor L _r1 is negative, and the current path of the switching circuit (4) is the input voltage V _dc → the parasitic of the second power switch S ₂ The second switching diode D _B → the primary side resonant inductor L _r1 → the primary side resonant capacitor C _r1 → the first switching diode D _A parasitized by the first power switch S ₁ . The primary side resonance inductor L _r1 , the primary side resonance capacitor C _{r1 ,} the secondary side resonance inductor L _r2 , and the secondary side resonance capacitor C _r2 generate series resonance, so that the input voltage V _dc transfers energy to the rectifier circuit (5) The current path through the rectifier circuit (5) is a secondary side resonance capacitor C _r2 → a secondary side resonance inductor L _r2 → a second capacitor C ₂ → a second diode D ₂ . Then twice the second capacitor C ₂ voltage V _C2 is equal to the load voltage V _O . When the power switch is switched, it switches to the next mode.

Working mode 2 [t ₁ t t ₂ 〕: Please refer to the fifth diagram of the working mode 2 equivalent circuit diagram of the present invention. In this working mode, the driving signal V of the first power switch S ₁ and the second power switch S _{2 Gs1} and V _{gs2 are} at a high level. At this time, the current i _Lr1 of the primary side resonance inductor L _r1 is positive, and the current path of the switching circuit (4) is the input voltage V _dc → the first power switch S ₁ → the primary side resonance Inductance L _r1 → primary side resonance capacitor C _r1 → second power switch S ₂ . The primary side resonance inductor L _r1 , the primary side resonance capacitor C _{r1 ,} the secondary side resonance inductor L _r2 , and the secondary side resonance capacitor C _r2 generate series resonance, so that the input voltage V _dc transfers energy to the rectifier circuit (5) The current path through the rectifier circuit (5) is a secondary side resonance capacitor C _r2 → a secondary side resonance inductor L _r2 → a second capacitor C ₂ → a second diode D ₂ . Then twice the second capacitor C ₂ voltage V _C2 is equal to the load voltage V _O . When the power switch is switched, it switches to the next mode.

Working mode three [t ₂ t t ₃ 〕: Please refer to the sixth diagram of the working mode three equivalent circuit diagram of the present invention. In this working mode, the driving signal V of the first power switch S ₁ and the second power switch S _{2 Gs1} and V _{gs2 are} at a high level. At this time, the current i _Lr1 of the primary side resonance inductor L _r1 is positive, and the current path of the switching circuit (4) is the input voltage V _dc → the first power switch S ₁ → the primary side resonance Inductance L _r1 → primary side resonance capacitor C _r1 → second power switch S ₂ . The primary side resonance inductor L _r1 , the primary side resonance capacitor C _{r1 ,} the secondary side resonance inductor L _r2 , and the secondary side resonance capacitor C _r2 generate series resonance, so that the input voltage V _dc transfers energy to the rectifier circuit (5) The current path through the rectifier circuit (5) is a secondary side resonance inductor L _r2 → a secondary side resonance capacitor C _r2 → a first diode D ₁ → a first capacitor C ₁ . Then twice the first capacitor C ₁ voltage V _C1 is equal to the load voltage V _O . When the power switch is switched, it switches to the next mode.

Working mode four [t ₃ t t ₄ 〕: Please refer to the seventh diagram of the working mode of the present invention as shown in the fourth equivalent circuit diagram. In this working mode, the driving signal V of the third power switch S ₃ and the fourth power switch S _{4 Gs3} and V _{gs4 are} at a high level. At this time, the current i _Lr1 of the primary side resonance inductor L _r1 is positive, and the current path of the switching circuit (4) is the input voltage V _dc → the parasitic part of the fourth power switch S ₄ The four-switch diode D _D → the primary side resonance inductor L _r1 → the primary side resonance capacitor C _r1 → the third switching diode D _C parasitized by the third power switch S ₃ . The primary side resonance inductor L _r1 , the primary side resonance capacitor C _{r1 ,} the secondary side resonance inductor L _r2 , and the secondary side resonance capacitor C _r2 generate series resonance, so that the input voltage V _dc transfers energy to the rectifier circuit (5) The current path through the rectifier circuit (5) is a secondary side resonance inductor L _r2 → a secondary side resonance capacitor C _r2 → a first diode D ₁ → a first capacitor C ₁ . Then twice the first capacitor C ₁ voltage V _C1 is equal to the load voltage V _O . When the power switch is switched, it switches to the next mode.

Working mode five [t ₄ t t ₅ 〕: Please refer to the eighth diagram of the working mode of the present invention as shown in the fifth equivalent circuit diagram. In this working mode, the driving signal V of the third power switch S ₃ and the fourth power switch S _{4 Gs3} and V _{gs4 are} at a high level. At this time, the current i _Lr1 of the primary side resonance inductor L _r1 is negative, and the current path of the switching circuit (4) is the input voltage V _dc → the third power switch S ₃ → the primary side resonance Inductance L _r1 → primary side resonance capacitor C _r1 → fourth power switch S ₄ . The primary side resonance inductor L _r1 , the primary side resonance capacitor C _{r1 ,} the secondary side resonance inductor L _r2 , and the secondary side resonance capacitor C _r2 generate series resonance, so that the input voltage V _dc transfers energy to the rectifier circuit (5) The current path through the rectifier circuit (5) is a secondary side resonance inductor L _r2 → a secondary side resonance capacitor C _r2 → a first diode D ₁ → a first capacitor C ₁ . Then twice the first capacitor C ₁ voltage V _C1 is equal to the load voltage V _O . When the power switch is switched, it switches to the next mode.

Working mode six [t ₅ t t ₆ 〕: Please refer to the ninth diagram of the working mode six equivalent circuit diagram of the present invention. In this working mode, the driving signal V of the third power switch S ₃ and the fourth power switch S _{4 Gs3} and V _{gs4 are} at a high level. At this time, the current i _Lr1 of the primary side resonance inductor L _r1 is negative, and the current path of the switching circuit (4) is the input voltage V _dc → the third power switch S ₃ → the primary side resonance Inductance L _r1 → primary side resonance capacitor C _r1 → fourth power switch S ₄ . The primary side resonance inductor L _r1 , the primary side resonance capacitor C _{r1 ,} the secondary side resonance inductor L _r2 , and the secondary side resonance capacitor C _r2 generate series resonance, so that the input voltage V _dc transfers energy to the rectifier circuit (5) The current path through the rectifier circuit (5) is a secondary side resonance inductor L _r2 → a secondary side resonance capacitor C _r2 → a first diode D ₁ → a first capacitor C ₁ . Then twice the first capacitor C ₁ voltage V _C1 is equal to the load voltage V _O . When the power switch is switched, it switches to the next mode.

The present invention utilizes the IsSpice simulation software to simulate and analyze the circuit, and finally, in conjunction with the hardware circuit test, compares the actual measured waveform and data with the waveform of the software simulation to compare whether the two meet the requirements. . Set the parameters as follows: input voltage 150V, input current 14.1A, output voltage 425.5V, output current 3.7A, switching frequency f _s =82.1kHz, duty cycle Duty=0.45, mutual inductance M=0.6μH, coupling coefficient k= 0.42, two coil distance 15cm, primary side resonance inductor L _r1 =178μH, primary side resonance capacitor C _r1 =21nF, primary side resonance frequency f _r1 =82.1kHz, secondary side resonance inductor L _r2 =116μH, secondary side resonance capacitor C _r2 =32.3nF, secondary side resonance frequency f _r2 =82.2kHz, load resistance 115Ω; the following is to test the analog waveform and the actual results: Please refer to the first and second power switch driving voltages of the present invention together with the tenth figure. Signal and switching voltage measured waveform diagram, eleventh figure, first and second power switch driving voltage signal and switching voltage analog waveform diagram of the present invention, twelfth figure, third and fourth power switch driving voltage signal and switching voltage of the present invention The measured waveform diagram and the thirteenth diagram show the analog waveforms of the driving voltage signal and the switching voltage of the third and fourth power switches of the present invention, and the waveform results show that the measured and simulated waveforms are almost the same. Please refer to the fourteenth embodiment of the present invention, the first and second power switch switching voltage and the flow through the switch current measured waveform diagram, the fifteenth figure of the present invention, the first and second power switch switching voltage and flow through the switch current simulation Waveform diagram, the sixteenth figure, the third and fourth power switch switching voltages and the measured current waveforms flowing through the switch current, the seventeenth figure, the third and fourth power switch switching voltages and the flow current through the switch current waveforms of the present invention As shown, the first power switch S ₁ , the second power switch S ₂ , the third power switch S ₃ , and the fourth power switch S ₄ are both operated in a zero current and zero voltage switching conduction state, so that the present invention has High efficiency features. Please refer to the eighteenth embodiment of the present invention, the primary side resonance capacitor voltage and current measured waveform diagram, the nineteenth embodiment of the present invention, the primary side resonance capacitor voltage and current analog waveform diagram, the twentieth diagram of the first side of the present invention Resonance inductor voltage and current measured waveform diagram, twenty-first diagram of the present invention, the primary side resonant inductor voltage and current analog waveform diagram, the twenty-second diagram of the present invention, the primary side resonant tank voltage and current measured waveform diagram, twentieth The present invention is a secondary side resonant tank voltage and current analog waveform diagram, the twenty-fourth embodiment of the present invention, the secondary side resonant inductor voltage and current measured waveform diagram, the twenty-fifth figure of the present invention, the secondary side resonant inductor voltage And current simulation waveform diagram, twenty-sixth embodiment of the present invention, the secondary side resonance capacitor voltage and current measured waveform diagram, the twenty-seventh diagram of the present invention, the secondary side resonance capacitor voltage and current analog waveform diagram, twenty-eighth The second embodiment of the present invention, the secondary side resonant tank voltage and current measured waveform diagram, the twenty-ninth figure of the present invention, the secondary side resonant tank voltage and current analog waveform diagram, shown by the waveform results Almost as an analog waveform. Please refer to the thirty-first diagram of the first diode voltage and current measured waveform diagram of the present invention, and the thirty-first diagram. The first diode voltage and current analog waveform diagram of the present invention, the thirty-second diagram The second diode voltage and current measured waveform diagram of the invention, and the thirty-third graph of the second diode voltage and current analog waveform diagram of the present invention, the first diode D ₁ and the second diode Body D ₂ operates in a zero current switching condition with low switching loss characteristics. Please refer to the thirty-fourth embodiment of the present invention, the first capacitor voltage and current measured waveform diagram, the thirty-fifth graph of the present invention, the first capacitor voltage and current analog waveform diagram, the thirty-sixth figure of the present invention Two capacitor voltage and current measured waveform diagram, thirty-seventh diagram The second capacitor voltage and current analog waveform diagram of the present invention, thirty-eighth diagram The measured voltage waveform of the output voltage and output current of the present invention and the thirty-ninth figure The analog waveform diagram of the output voltage and the output current of the present invention shows that the output voltage is 425.5V, the output current is 3.7A, and the output power is 1574W. The input voltage is 150V, the input current is 14.1A, the input power is 2115W, and the conversion efficiency is calculated to be 74.42%.

Please refer to the graph of the measured efficiency at different input voltages under the condition of fixed load resistance. The lower the input voltage, the lower the converter efficiency. The lower the input voltage, the lower the output power. And most of the power loss is consumed in the reluctance of the primary side resonance inductor L _r1 and the secondary side resonance inductor L _r2 air gap, which causes a main cause of low conversion efficiency.

As described above, the implementation of the present invention shows that the present invention is mainly operated in a high frequency environment, and has the characteristics of small circuit size, light weight, and low cost, and the like. It can have more flexible adjustment space, can achieve converters with different properties, and has flexible switching characteristics, which reduces the loss during the process, can greatly improve the overall conversion efficiency, and has more practical functions in its overall implementation. By.

However, the above-described embodiments or drawings are not intended to limit the structure or the use of the present invention, and any suitable variations or modifications of the invention will be apparent to those skilled in the art.

In summary, the embodiments of the present invention can achieve the expected use efficiency, and the specific structure disclosed therein has not been seen in similar products, nor has it been disclosed before the application, and has completely complied with the provisions of the Patent Law. And request, 提出 legally filed invention patents If you apply, please give us a review and grant a patent.

Claims (2)

A solar-powered wireless power conversion system mainly includes a solar photovoltaic array (PVArray), a maximum power tracking system, and a single wafer; the solar photovoltaic array is combined by a plurality of photovoltaic modules (PV Modules) The maximum power tracking system is connected to the output end of the solar photovoltaic array, and the single chip is connected to the maximum power tracking system, and the single chip receives the solar photovoltaic array and the maximum power tracking system. The data detected by the feedback circuit is connected to generate a trigger signal for transmission to the maximum power tracking system, and the feedback circuit is provided with a Hall sensor for current detection, and the maximum power tracking is used. The system outputs an appropriate voltage V _dc to the input end of the connected switching circuit, so that the switching circuit generates a high-frequency alternating magnetic field, which is coupled to the rectifier circuit via air, and then rectified by the rectifier circuit The rear DC power is supplied to the connected load. The solar-powered wireless power conversion system of claim 1, wherein the switching circuit and the rectifier circuit are in series resonance; the switching circuit is connected to the input voltage V _dc positive terminal and the first power switch S respectively the first end of the third power switch S ₁ and the first end is _{connected. 3,} and enabling the first power switch S ₁ and the second terminal of the fourth power switch S is _{connected. 4} of the first end and the second order The second end of the three power switch S ₃ is connected to the first end of the second power switch S ₂ , and the input voltage V _dc negative end is respectively connected to the second end of the fourth power switch S _{4 and} the second end The second end of the power switch S ₂ is connected, and the first end of the primary side resonant capacitor C _r1 is connected between the second end of the third power switch S _{3 and} the first end of the second power switch S ₂ . , the primary side of the second end of the resonant capacitor C _r1 and a first primary-side resonant inductor L _r1 of the end connector, and the second end of the primary side of the resonant inductor L _r1 is connected to the second of the first power switch S ₁ The second end is connected between the first end of the fourth power switch S ₄ ; the rectifying circuit is connected to the secondary side A first end of the inductor L _r2 vibration of the resonant capacitor C is connected to a first terminal of the secondary side of _r2, a second end of the secondary side resonance capacitor C _r2 of respectively the first diode D ₁ and the second end of the second The first ends of the diodes D _{2 are} connected, and the second ends of the second side resonant inductors L _r2 are respectively connected to the second ends of the first capacitor C _{1 and} the first ends of the second capacitor C ₂ . The first end of the first diode D _{1 and} the first end of the first capacitor C ₁ are connected to the first end of the output filter capacitor C _{O and} the first end of the load, and the second pole is simultaneously The second end of the body D _{2 and} the second end of the second capacitor C ₂ are connected to the second end of the output filter capacitor C _{O and} the second end of the load; the primary side resonant inductor L _r1 , the primary side resonant capacitor C _R1 generates a series resonance with the secondary side resonance inductor L _r2 and the secondary side resonance capacitor C _r2 .