CN103701329A - Solar photovoltaic converter of phase-shifted full-bridge soft switch - Google Patents
Solar photovoltaic converter of phase-shifted full-bridge soft switch Download PDFInfo
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- CN103701329A CN103701329A CN201410016141.2A CN201410016141A CN103701329A CN 103701329 A CN103701329 A CN 103701329A CN 201410016141 A CN201410016141 A CN 201410016141A CN 103701329 A CN103701329 A CN 103701329A
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a solar photovoltaic converter of a phase-shifted full-bridge soft switch. The solar photovoltaic converter comprises a photovoltaic cell array, a full-bridge DC/DC (direct current/direct current) converter, a photovoltaic array voltage detection circuit, a controller, an isolated driving circuit, a small photovoltaic cell, an open circuit voltage detection circuit and an operational circuit, wherein a positive pole and a negative pole of the photovoltaic cell array are connected with the positive pole and the negative pole of the full-bridge DC/DC converter, and the positive pole of the photovoltaic cell array is further connected with the photovoltaic array voltage detection circuit; the output end of the photovoltaic array voltage detection circuit is connected with the input end of the controller; the small photovoltaic cell, the open circuit voltage detection circuit and the operational circuit are sequentially connected, the operational circuit is connected with the controller, the controller is connected with the isolated driving circuit, and the isolated driving circuit is connected with the full-bridge DC/DC converter. The solar photovoltaic converter has the advantages of simple circuit structure, convenient design, stability and reliability in operation and high practicality.
Description
Technical field
The present invention relates to solar-energy photo-voltaic cell field, in particular, a kind of photovoltaic converter of phase shifting full bridge soft switch.
Background technology
Solar energy has boundless development prospect as a kind of pollution-free, reproducible new forms of energy, is at home and abroad widely applied.Solar energy power generating is to utilize the photovoltaic effect of solar cell that solar energy is directly converted to electric energy the reasonable generation mode of utilization in addition, the photovoltaic effect of photovoltaic cell as shown in Figure 1, under illumination effect, two interpolars of photovoltaic cell have electromotive force to produce, connect load (as bulb), in loop, just have electric current to flow through.
But, in actual applications, particularly in the larger application scenario of power, photovoltaic cell directly connects load infeasible, because generally, load is not mated with battery (power supply), photovoltaic cell cannot be brought its maximum electricity generation efficiency into play, therefore, between photovoltaic cell and load, conventionally to add one-level circuit, when realizing DC/DC conversion, realize maximal power tracing (MPPT).Photovoltaic DC/DC converter has various structures at present, comprises Buck circuit, Boost circuit, Cuk circuit, full-bridge circuit etc.
Having applied for a patent of akin implementation before this:
1) application number is " 200610061264 ", name is called " a kind of control method of phase whole-bridging circuit and control circuit thereof ", this patent of invention is mainly carried out load judgement, and decision circuit relatively reflects the signal of phase whole-bridging circuit load weight and given reference signal; If load is underloading, reduce the on-off times of switching tube within the unit interval in phase whole-bridging circuit; This patent mainly solves is to judge underloading and change its control mode to reach the loss problem while reducing underloading, does not relate to full-bridge phase shifting circuit and how in photovoltaic generation, how to apply.
2) application number is " 200510100148 ", name is called " method for handover control and the control circuit of phase-shifting full-bridge and PWM full-bridge in converter ", this invention is that what mainly to be solved is the method for handover control of phase-shifting full-bridge and PWM full-bridge in phase-shifted full-bridge converter, the signal specific that reflects converter load weight by collection, this signal specific and preset value are compared, according to the size of signal specific value and preset value, control change device is operated in phase-shifting full-bridge state or PWM full-bridge state.The object of this patent is to overcome phase whole-bridging circuit large problem of switching loss when underloading or approaching zero load, does not relate to full-bridge phase shifting circuit and how in photovoltaic generation, how to apply.
3) application number is " 200810093772 ", and name is called " a kind of grid-connected photovoltaic system of three-phase and four-line ", and what this invention proposed is a kind of grid-connected photovoltaic system of three-phase and four-line, comprising: DC-DC booster circuit, grid-connected inverter circuit and control circuit; The input of DC-DC booster circuit is connected with solar panel, output is connected with grid-connected inverter circuit, for lower solar panel output voltage being changed into the direct voltage of higher Gong inversion, realize the maximum power output of solar panel simultaneously; Grid-connected inverter circuit is connected with electrical network, the direct voltage of DC-DC booster circuit output is converted to and three phase network voltage with the alternating voltage of homophase frequently, for threephase load or three road single-phase loads are powered respectively; Control circuit is connected respectively with grid-connected inverter circuit with DC-DC booster circuit, is respectively DC-DC booster circuit and grid-connected inverter circuit pwm control signal is provided; This invention is mentioned and is adopted full-bridge circuit as the DC/DC converter in photovoltaic generating system, but its control mode adopts microprocessor to realize, and full-bridge circuit does not adopt phase shifting full bridge soft switch control mode, and the switching tube of H bridge works in hard switching state, the loss of converter own is large, and efficiency is low.And this invention does not relate to the specific implementation that its photovoltaic maximal power tracing is controlled.
4) application number is " 200810122678 ", name is called " solar photovoltaic interconnected inverter ", and in this invention, photovoltaic DC/DC converter using is two Boost booster circuit parallel-connection structures, and system power grade is not high, switching tube is not realized soft switch, and power loss is larger.
5) application number is " 200810052443 ", name is called " the solar energy maximal efficiency tracking circuit based on CVT method ", what this patent of invention adopted is CVT control method, it is first to suppose in temperature-resistant situation, the substantially invariable principle of the maximum power point voltage of photovoltaic cell during according to change in radiation intensity, exports certain power thereby force the output voltage of photovoltaic cell to remain in advance given voltage by control circuit; This control method has the advantages such as implementation is simple, reliable and stable, and in the course of the work, range of temperature from morning to night, is throughout the year very large for photovoltaic cell.But the method is a kind of method under the constant prerequisite of supposition photovoltaic battery temperature, therefore the method is not considered temperature having a strong impact on photovoltaic generation, there is very large shortcoming in this method in engineering application in other words, and its generating efficiency is lower than additive methods such as disturbance observations.
6) application number is " 200810033999 ", and name is called " the time variant voltage photovoltaic system maximum power tracking and controlling method that adapts to weather conditions ", and what in this invention, photovoltaic DC/DC translation circuit adopted is Sepic chopper circuit.What maximal power tracing adopted is modified model constant voltage tracking and controlling method, by gathering the temperature three item number certificates of voltage, electric current and the photovoltaic battery panel of photovoltaic cell output, according to predetermined algorithm, calculate, thereby determine best effort point voltage, go forward side by side trip temperature and illuminance compensation.The method is considered temperature and the impact of illumination on photovoltaic power output, but, characteristic due to photovoltaic cell complexity, only according to the temperature of certain voltage, electric current and photovoltaic battery panel constantly, calculate its open circuit voltage and brightness value, and further to obtain thus optimum operating voltage be extremely coarse, and implementing comparatively complexity, cost is higher.
7) application number is " 200710098911 ", name is called " a kind of method of tracing maximum power point of solar photovoltaic battery ", the method is improved traditional CVT, first detect illumination intensity value, and by tabling look-up, provide photovoltaic cell to fixed working voltage according to illumination intensity value, and follow the tracks of it by control circuit.The method considers that the CVT such as the environmental factors such as intensity of illumination control the impact of method, than traditional CVT, its generating efficiency makes moderate progress, but intensity of illumination and temperature are not simple monotropic function relation, so the method can not effectively overcome the impact of ambient temperature on photovoltaic generation.In addition, the method is not specifically related to the realization of photovoltaic DC/DC converter, and the method need adopt control chip to store the given voltage of solar-energy photo-voltaic cell under different intensity of sunshines, comparatively complicated.
8) application number is " 200310120548 ", and name is called " maximum power tracing method of solar power system and device ", and in this invention, DC/DC converter using is Boost circuit, and inverter power grade is not high; Do not realize soft switch, efficiency is lower.What maximal power tracing adopted is disturbance observation, need to adopt single-chip microcomputer, DSP etc. is controller, need programming, implement comparatively complicated, and can only near maximum power point, shake operation, can cause Partial Power loss, the given of initial value and tracing step has considerable influence to tracking accuracy and speed.
9) application number is " 200610026170 ", name is called " method of solar cell maximum power point tracking device and tracking thereof ", in this invention, DC/DC converter using is Boost circuit, and what maximal power tracing adopted is disturbance observation, and shortcoming is with the 8th.
Therefore, there is defect in prior art, needs to improve.
Summary of the invention
Technical problem to be solved by this invention is to provide that a kind of circuit structure is simple, the photovoltaic converter of design convenience, stable and reliable operation, practical phase shifting full bridge soft switch.
For achieving the above object, the present invention has adopted following technical scheme: a kind of photovoltaic converter of phase shifting full bridge soft switch, comprises photovoltaic battery array, full-bridge DC/DC converter, photovoltaic array voltage detecting circuit, controller, isolated drive circuit, low profile photovoltaic battery, open circuit voltage testing circuit and computing circuit;
The positive pole of described photovoltaic battery array, negative pole are connected with positive pole, the negative pole of full-bridge DC/DC converter respectively, and the positive pole of described photovoltaic battery array is also connected with photovoltaic array voltage detecting circuit; The output of described photovoltaic array voltage detecting circuit is connected with the input of controller;
The output of described low profile photovoltaic battery is connected with the input of open circuit voltage testing circuit, the output of described open circuit voltage testing circuit is connected with the input of computing circuit, the output of described computing circuit is connected with the input of controller, the output of described controller is connected with the input of isolated drive circuit, and described isolated drive circuit is connected with full-bridge DC/DC converter.
Preferably, in the photovoltaic converter of described phase shifting full bridge soft switch, between the positive pole of described photovoltaic battery array and the positive pole of full-bridge DC/DC converter, be connected with diode.
Preferably, in the photovoltaic converter of described phase shifting full bridge soft switch, described full-bridge DC/DC converter is phase shifting full bridge soft switch DC/DC converter, adopts the isolated topological structure of full-bridge, realizes the conversion of direct voltage by high frequency transformer.
Preferably, in the photovoltaic converter of described phase shifting full bridge soft switch, described phase shifting full bridge soft switch DC/DC converter is provided with four soft switches, and described isolated drive circuit is connected with four soft switches of phase shifting full bridge soft switch DC/DC converter respectively.
Preferably, in the photovoltaic converter of described phase shifting full bridge soft switch, described controller is UCC3895 phase shift type PWM controller, adopts UCC3895 as the controller of full-bridge circuit, make four switching tubes of full-bridge work in soft on off state, reduce switching loss.
Preferably, in the photovoltaic converter of described phase shifting full bridge soft switch, described UCC3895 phase shift type PWM controller comprises that adjuster, sawtooth waveforms form circuit, protective circuit, comparator and PWM and form circuit;
The output of described photovoltaic array voltage detecting circuit is connected with the input of adjuster, the output of described computing circuit is connected with the input of adjuster, the output of described adjuster is connected with the input of comparator, described sawtooth waveforms forms circuit and is connected with comparator, the output of described comparator forms circuit with PWM and is connected, described photovoltaic array voltage detecting circuit also forms circuit by protective circuit with PWM and is connected, and described PWM forms circuit and is connected with isolated drive circuit;
In control loop, introduce closed-loop control, adopt CVT control mode to follow the tracks of control to the output voltage of photovoltaic array, according to photovoltaic cell open circuit voltage and maximum power point voltage, become all the time linear approximate relationship when the variation of temperature and illumination, in photovoltaic generating system, increase a less photovoltaic battery module with photovoltaic array identical characteristics, detect its open circuit voltage, by computing circuit, according to fixed coefficient, calculate current maximum power point voltage, and as the voltage given of CVT closed-loop control, the photovoltaic array output voltage that adjuster detects this given voltage and photovoltaic array testing circuit compares with PI and regulates, keep photovoltaic array output voltage stabilization to be operated on current maximum power point, reach Maximum Power Output and follow the tracks of the object of controlling, thereby guarantee that photovoltaic cell is all the time with its corresponding maximum power output electric energy when the environmental factors such as temperature and illumination change.
Preferably, in the photovoltaic converter of described phase shifting full bridge soft switch, the output connection electric loading of described phase shifting full bridge soft switch DC/DC converter.
Beneficial effect with respect to prior art is, adopt such scheme, the present invention adopts full-bridge topologies in photovoltaic DC/DC converter, and the effectively power grade of elevator system integral body, and introducing nonshared control unit UCC3895 is as control core, adopt phase shifting full bridge soft switch working method, can effectively reduce the switching loss of switching tube, improve system effectiveness, and can improve the operating frequency of converter, reduce volume weight, reduce costs; Simultaneously, in convertor controls pattern, adopt a kind of novel constant voltage to follow the tracks of (CVT) control mode, realized tracing maximum power of photovoltaic cell, and circuit structure is simple, design convenience, stable and reliable operation, cost performance are high, practical;
Control method and control circuit thereof with a patent document 1(phase whole-bridging circuit of mentioning in background technology), method for handover control and the control circuit of phase-shifting full-bridge and PWM full-bridge in patent document 2(converter) relatively, the present invention is intended to propose the application of phase shifting full bridge soft switch technology in solar photovoltaic generation system, when realizing voltage transformation, soft switch, to realize maximal power tracing and control, to realize effective utilization of photovoltaic cell; Particularly adopted this Novel CVT control mode of photovoltaic cell that increases fritter same model, environmental factor the having a strong impact on photovoltaic cell capable of generating power such as temperature and illumination have greatly been reduced, improved generating efficiency, strengthened the practicality of CVT control method, and the circuit cost increasing considerably less (fritter photovoltaic cell and voltage detecting computing circuit);
Grid-connected photovoltaic system with a patent document 3(three-phase and four-line of mentioning in background technology) relatively, the present invention adopts UCC3895 nonshared control unit to control full-bridge DC/DC converter, can realize soft switch, and efficiency is higher; And implement more for convenience, cost is lower.The present invention simultaneously adopts a kind of Novel CVT control mode, makes circuit working reliable and stable, and it is convenient to realize, and cost performance is high;
With the patent document 4(solar photovoltaic interconnected inverter of mentioning in background technology), the solar energy maximal efficiency tracking circuit of patent document 5(based on CVT method), patent document 6(adapts to the time variant voltage photovoltaic system maximum power tracking and controlling method of weather conditions), the method of a patent document 7(tracing maximum power point of solar photovoltaic battery), maximum power tracing method and the device of patent document 8(solar power system), the method of patent document 9(solar cell maximum power point tracking device and tracking thereof) relatively, what the present invention adopted is that phase shifting full bridge soft switch technology realizes photovoltaic DC/DC conversion, photovoltaic converter power grade is large, efficiency is high, and the present invention adopts a kind of Novel CVT control mode, solar energy maximal efficiency tracking circuit with patent document 5(based on CVT method), patent document 6(adapts to the time variant voltage photovoltaic system maximum power tracking and controlling method of weather conditions), the method of a patent document 7(tracing maximum power point of solar photovoltaic battery) modified model CVT, maximum power tracing method and the device of patent document 8(solar power system), the method of patent document 9(solar cell maximum power point tracking device and tracking thereof) disturbance observations etc. relatively, the present invention does not need to adopt microprocessor programming, maximum power tracking and controlling method is more reliable and more stable, realize convenient, cost performance is higher, there is good market using value.
Accompanying drawing explanation
Fig. 1 is photovoltaic effect schematic diagram;
Fig. 2 is the schematic diagram of one embodiment of the present of invention;
Fig. 3 is the circuit diagram of Fig. 1 embodiment of the present invention;
Fig. 4 is the circuit simulation figure of Fig. 1 embodiment of the present invention.
Embodiment
For the ease of understanding the present invention, below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.In accompanying drawing, provided preferred embodiment of the present invention.But the present invention can realize in many different forms, be not limited to the described embodiment of this specification.On the contrary, providing the object of these embodiment is to make to the understanding of disclosure of the present invention more thoroughly comprehensively.
It should be noted that, when element is called as " being fixed on " another element, can directly can there is element placed in the middle in it on another element or also.When an element is considered to " connection " another element, it can be directly connected to another element or may have centering elements simultaneously.The term that this specification is used " parallel connection ", " given voltage " and similar statement are just for illustrative purposes.
Unless otherwise defined, all technology that this specification is used are identical with the implication that belongs to the common understanding of those skilled in the art of the present invention with scientific terminology.The term using in specification of the present invention in this specification, just in order to describe the object of specific embodiment, is not for limiting the present invention.
As shown in Figure 2, one embodiment of the present of invention are, the photovoltaic converter of this phase shifting full bridge soft switch, comprises photovoltaic battery array, full-bridge DC/DC converter, photovoltaic array voltage detecting circuit, controller, isolated drive circuit, low profile photovoltaic battery, open circuit voltage testing circuit and computing circuit; The positive pole of described photovoltaic battery array, negative pole are connected with positive pole, the negative pole of full-bridge DC/DC converter respectively, between the positive pole of described photovoltaic battery array and the positive pole of full-bridge DC/DC converter, are connected with diode; Between described photovoltaic battery array and full-bridge DC/DC converter, be parallel with electric capacity; The positive pole of described photovoltaic battery array is also connected with photovoltaic array voltage detecting circuit; The output of described photovoltaic array voltage detecting circuit is connected with the input of controller;
Described controller is UCC3895 phase shift type PWM controller, adopt UCC3895 as the controller of full-bridge circuit, make four switching tubes of full-bridge work in soft on off state, reduce switching loss, UCC3895 controller is applicable to full-bridge converter and controls, phase place by a mobile half-bridge to another half-bridge driven pulse, realize constant frequency, the pulse width modulation of high efficiency Zero voltage transition, this device both can be used as voltage-type and had controlled, also can be used as current-mode control, UCC3895 adopts zero voltage switch pulse modulation technology, under high-frequency work state, there is very high efficiency, in this device, also there is independently current foldback circuit, can realize quick error protection, UCC3895 has strengthened control logic ability, has increased adaptive delay setting and turn-off capacity simultaneously, described UCC3895 phase shift type PWM controller comprises that adjuster, sawtooth waveforms form circuit, protective circuit, comparator and PWM and form circuit, the output of described low profile photovoltaic battery is connected with the input of open circuit voltage testing circuit, and the output of described open circuit voltage testing circuit is connected with the input of computing circuit, and the output of described computing circuit is connected with the input of adjuster, the output of described photovoltaic array voltage detecting circuit is connected with the input of adjuster, the output of described adjuster is connected with the input of comparator, described sawtooth waveforms forms circuit and is connected with comparator, the output of described comparator forms circuit with PWM and is connected, described photovoltaic array voltage detecting circuit also forms circuit by protective circuit with PWM and is connected, described PWM forms circuit and is connected with isolated drive circuit, and described isolated drive circuit is connected with full-bridge DC/DC converter,
Described full-bridge DC/DC converter is phase shifting full bridge soft switch DC/DC converter, adopts the isolated topological structure of full-bridge, realizes the conversion of direct voltage by high frequency transformer; Described phase shifting full bridge soft switch DC/DC converter is provided with four soft switches, and described isolated drive circuit is connected with four soft switches of phase shifting full bridge soft switch DC/DC converter respectively; The output connection electric loading of described phase shifting full bridge soft switch DC/DC converter.
In control loop, introduce closed-loop control, adopt CVT control mode to follow the tracks of control to the output voltage of photovoltaic array, in order to overcome traditional CVT, be subject to the serious shortcomings of such environmental effects such as temperature and illumination, the present invention also improves traditional C VT, according to photovoltaic cell open circuit voltage Uoc and its maximum power point voltage Um, become all the time linear approximate relationship when the variation of temperature and illumination, in photovoltaic generating system, increase a less photovoltaic battery module with photovoltaic array identical characteristics, detect its open circuit voltage, the concrete photovoltaic cell types model parameter that provides according to producer according to fixed coefficient k=Um/Uoc(by computing circuit is determined) calculate current maximum power point voltage Umax, and as the voltage given of CVT closed-loop control, the photovoltaic array output voltage that adjuster detects this given voltage and photovoltaic array testing circuit compares with PI and regulates, keep photovoltaic array output voltage stabilization to be operated on current maximum power point, reach Maximum Power Output and follow the tracks of the object of controlling, thereby guarantee that photovoltaic cell is all the time with its corresponding maximum power output electric energy when the environmental factors such as temperature and illumination change.
In photovoltaic generating system, adopt phase shifting full bridge soft switch working method to realize DC/DC conversion; In photovoltaic generation DC/DC converter, adopt nonshared control unit UCC3895 to realize phase shifting full bridge soft switch working method; Adopt novel constant voltage tracking control to realize maximal power tracing: to increase a less photovoltaic battery module with photovoltaic array identical characteristics, detect its open circuit voltage, by computing circuit, according to fixed coefficient, calculate current maximum power point voltage Umax, and as the voltage given of CVT closed-loop control.
Full-bridge DC/DC converter using full-bridge topologies, adopt nonshared control unit UCC3895 as control core, make converter work in full-bridge phase-shift soft switch (PS-FB-ZVS) mode, adopt novel constant voltage to follow the tracks of (CVT) control method simultaneously the output voltage of photovoltaic cell is followed the tracks of to control, when realizing photovoltaic maximal power tracing, realized the soft switch of power converter, significantly improved the efficiency of photovoltaic generation, and system run all right has been reliable, with low cost.
Figure 3 shows that according to the circuit diagram of technique scheme design, in figure, Q
1, Q
2, Q
3, Q
4, T, D
2, D
3, L
2, C
2deng formation phase-shifting full-bridge DC/DC inverter main circuit, in dotted line frame in Fig. 3, it is UCC3895 phase shift type PWM controller, photovoltaic widgets is the low profile photovoltaic battery component of the same type with photovoltaic battery array, for detection of the open circuit voltage of photovoltaic array under same environmental conditions, and U21A, R
3, R
4, U22A etc. forms open circuit voltage detection calculations circuit.Its operation principle is: low profile photovoltaic assembly is with photovoltaic array under identical illumination and temperature environment condition, and U21A detects the open circuit voltage of photovoltaic module, by R
3, R
4carry out dividing potential drop scale operation, and the voltage given of controlling as photovoltaic array CVT through U22A output, scale operation parameter is by type model, the two voltage ratio and the R of actual photovoltaic array and photovoltaic test suite
1, R
2, R
3, R
4determine.For example, photovoltaic array and open circuit voltage test photovoltaic widgets all adopt KC series polysilicon photovoltaic module of the same type, AM1.5, irradiance 1000W/m2, open circuit voltage Uoc21.7V under 25 ℃ of reference condition of temperature, maximum power point voltage 17.4V, fixed coefficient is got k=17.4/21.7 ≈ 0.802.Photovoltaic array adopts the assembly of working point 17.4V/3.31A/50W, and also, output services voltage U o is 139.2V to 8 strings * 4, and photovoltaic open test widgets adopts the assembly of 17.4V/0.57A/10W, gets the given voltage U ref of adjuster, meets following condition:
Uo×R2/(R1+R2)=Uref
Can determine the value of R1, R2.
Meet following condition:
Uoc×R4/(R3+R4)=Uref
Can determine the value of R3, R4.
Get the given voltage U ref=5V of adjuster under reference condition, desirable R1=134.2k Ω, R2=5k Ω, R3=20k Ω, R4=6k Ω.
Adopt PSpice/ORCAD software to carry out emulation to this circuit, can verify the effect of this technical scheme, Figure 4 shows that simulation result, article three, curve is respectively photovoltaic battery temperature situation of change (0 ℃, 25 ℃, 50 ℃, 75 ℃, 100 ℃), the photovoltaic widgets open circuit voltage detecting and the output voltage waveforms of photovoltaic battery array that emulation is set, can find out, photovoltaic widgets open circuit voltage and photovoltaic array output voltage all reduce along with the rising of battery temperature.The present invention has guaranteed that photovoltaic cell voltage is for the best operating point under its corresponding temperature, on this working point, photovoltaic cell is brought into play its best photoelectric conversion efficiency, power output is maximum, electric energy is maximum, thereby overcome the impact of temperature on photovoltaic cell capable of generating power, simultaneously with low cost, working stability is reliable, practical.
It should be noted that, above-mentioned each technical characterictic continues combination mutually, forms the various embodiment that do not enumerate in the above, is all considered as the scope that specification of the present invention is recorded; And, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (7)
1. the photovoltaic converter of a phase shifting full bridge soft switch, it is characterized in that, comprise photovoltaic battery array, full-bridge DC/DC converter, photovoltaic array voltage detecting circuit, controller, isolated drive circuit, low profile photovoltaic battery, open circuit voltage testing circuit and computing circuit;
The positive pole of described photovoltaic battery array, negative pole are connected with positive pole, the negative pole of full-bridge DC/DC converter respectively, and the positive pole of described photovoltaic battery array is also connected with photovoltaic array voltage detecting circuit; The output of described photovoltaic array voltage detecting circuit is connected with the input of controller;
The output of described low profile photovoltaic battery is connected with the input of open circuit voltage testing circuit, the output of described open circuit voltage testing circuit is connected with the input of computing circuit, the output of described computing circuit is connected with the input of controller, the output of described controller is connected with the input of isolated drive circuit, and described isolated drive circuit is connected with full-bridge DC/DC converter.
2. the photovoltaic converter of phase shifting full bridge soft switch according to claim 1, is characterized in that, between the positive pole of described photovoltaic battery array and the positive pole of full-bridge DC/DC converter, is connected with diode.
3. the photovoltaic converter of phase shifting full bridge soft switch according to claim 2, it is characterized in that, described full-bridge DC/DC converter is phase shifting full bridge soft switch DC/DC converter, adopts the isolated topological structure of full-bridge, realizes the conversion of direct voltage by high frequency transformer.
4. the photovoltaic converter of phase shifting full bridge soft switch according to claim 3, it is characterized in that, described phase shifting full bridge soft switch DC/DC converter is provided with four soft switches, and described isolated drive circuit is connected with four soft switches of phase shifting full bridge soft switch DC/DC converter respectively.
5. the photovoltaic converter of phase shifting full bridge soft switch according to claim 4, it is characterized in that, described controller is UCC3895 phase shift type PWM controller, adopts UCC3895 as the controller of full-bridge circuit, make four switching tubes of full-bridge work in soft on off state, reduce switching loss.
6. the photovoltaic converter of phase shifting full bridge soft switch according to claim 5, is characterized in that, described UCC3895 phase shift type PWM controller comprises that adjuster, sawtooth waveforms form circuit, protective circuit, comparator and PWM and form circuit;
The output of described photovoltaic array voltage detecting circuit is connected with the input of adjuster, the output of described computing circuit is connected with the input of adjuster, the output of described adjuster is connected with the input of comparator, described sawtooth waveforms forms circuit and is connected with comparator, the output of described comparator forms circuit with PWM and is connected, described photovoltaic array voltage detecting circuit also forms circuit by protective circuit with PWM and is connected, and described PWM forms circuit and is connected with isolated drive circuit;
In control loop, introduce closed-loop control, adopt CVT control mode to follow the tracks of control to the output voltage of photovoltaic array, according to photovoltaic cell open circuit voltage and maximum power point voltage, become all the time linear approximate relationship when the variation of temperature and illumination, in photovoltaic generating system, increase a less photovoltaic battery module with photovoltaic array identical characteristics, detect its open circuit voltage, by computing circuit, according to fixed coefficient, calculate current maximum power point voltage, and as the voltage given of CVT closed-loop control, the photovoltaic array output voltage that adjuster detects this given voltage and photovoltaic array testing circuit compares with PI and regulates, keep photovoltaic array output voltage stabilization to be operated on current maximum power point, reach Maximum Power Output and follow the tracks of the object of controlling, thereby guarantee that photovoltaic cell is all the time with its corresponding maximum power output electric energy when the environmental factors such as temperature and illumination change.
7. the photovoltaic converter of phase shifting full bridge soft switch according to claim 6, is characterized in that, the output connection electric loading of described phase shifting full bridge soft switch DC/DC converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410016141.2A CN103701329A (en) | 2014-01-14 | 2014-01-14 | Solar photovoltaic converter of phase-shifted full-bridge soft switch |
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| CN104731153A (en) * | 2015-01-27 | 2015-06-24 | 北京利德曼生化股份有限公司 | Closed-loop regulation drive circuit for high-power semiconductor chilling plate |
| CN105071671A (en) * | 2015-08-05 | 2015-11-18 | 东南大学 | Phase-shifted full-bridge converter for suppressing magnetic flux unbalance of high-frequency transformer |
| CN108268084A (en) * | 2018-03-30 | 2018-07-10 | 惠安县大林智能科技有限公司 | Maximum power point tracing method and the photovoltaic generating system for realizing MPPT outputs |
| CN109066847A (en) * | 2018-08-03 | 2018-12-21 | 青岛海信电器股份有限公司 | A kind of photovoltaic power generation charge-discharge control circuit |
| WO2020198960A1 (en) * | 2019-03-29 | 2020-10-08 | 华为技术有限公司 | Photovoltaic converter module string, control method, and system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104731153A (en) * | 2015-01-27 | 2015-06-24 | 北京利德曼生化股份有限公司 | Closed-loop regulation drive circuit for high-power semiconductor chilling plate |
| CN105071671A (en) * | 2015-08-05 | 2015-11-18 | 东南大学 | Phase-shifted full-bridge converter for suppressing magnetic flux unbalance of high-frequency transformer |
| CN108268084A (en) * | 2018-03-30 | 2018-07-10 | 惠安县大林智能科技有限公司 | Maximum power point tracing method and the photovoltaic generating system for realizing MPPT outputs |
| CN109066847A (en) * | 2018-08-03 | 2018-12-21 | 青岛海信电器股份有限公司 | A kind of photovoltaic power generation charge-discharge control circuit |
| WO2020198960A1 (en) * | 2019-03-29 | 2020-10-08 | 华为技术有限公司 | Photovoltaic converter module string, control method, and system |
| US11605951B2 (en) | 2019-03-29 | 2023-03-14 | Huawei Digital Power Technologies Co., Ltd. | Photovoltaic converter string, control method, and system |
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