CN102904452A - Auxiliary power supply based on off-network photovoltaic power generation system - Google Patents
Auxiliary power supply based on off-network photovoltaic power generation system Download PDFInfo
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- CN102904452A CN102904452A CN2012103743100A CN201210374310A CN102904452A CN 102904452 A CN102904452 A CN 102904452A CN 2012103743100 A CN2012103743100 A CN 2012103743100A CN 201210374310 A CN201210374310 A CN 201210374310A CN 102904452 A CN102904452 A CN 102904452A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- 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 an auxiliary power supply based on an off-network photovoltaic power generation system, which comprises a power supply input end, a switch transformer T3, a close light coupling feedback circuit and a power supply output end, wherein a TOPSwitch-256 one-chip switching power supply chip forms a single-ended flyback topology circuit. The auxiliary power supply based on the off-network photovoltaic power generation system disclosed by the invention has the advantages of simple circuit structure, low cost, stable performances and the like.
Description
Technical field
The present invention relates to from the net photovoltaic generating system, specifically refer to a kind of based on the accessory power supply from the net photovoltaic generating system.
Background technology
In 19 end of the centurys, because human to the immoderate predation of the Nature resource, human survival and development is faced with " resource shortage " this serious problem; And solar energy resources is one of energy of human main this utilization of 21st century.At present, photovoltaic generation is with fastest developing speed, utilizes general solar energy widest in area to utilize mode.Photovoltaic generating system is played a part very important as one of the core of photovoltaic generating system " accessory power supply ".The accessory power supply of photovoltaic generating system is mainly used in control circuit, drive circuit or the supervisory circuit power supply to photovoltaic generating system.Accessory power supply not only affects the stability of whole system, reliability, and efficient, and can affect the layout strategy of whole photovoltaic generating system.
As its name suggests, be exactly directly to utilize solar panels to convert solar energy into direct voltage from the net photovoltaic generating system; Then by the buck circuit among the DC-DC direct voltage of shakiness being converted into required galvanic current presses.The Voltage-output of traditional buck circuit is through the feedback pin of feedback circuit both at home and abroad, and feedback voltage V FB compares with the comparative voltage that sets; The mistake voltage that produces is input to PWM (pulse width modulation) module, and PWM regulates duty ratio according to mistake voltage, thus the output of regulation voltage, traditional accessory power supply basic flow sheet as shown in Figure 1.Yet the sample circuit in traditional accessory power supply, amplifying circuit and pwm control circuit cost are higher, and peripheral components is more various, cause the accessory power supply price high, are difficult to the planningization popularization.
Summary of the invention
The objective of the invention is the shortcoming and defect that exists in order to overcome prior art, and provide a kind of and have that circuit structure is simple, with low cost, the advantages such as stable performance and making and debugging are convenient based on the accessory power supply from the net photovoltaic generating system.
For achieving the above object, technical scheme of the present invention be include power input,, current rectifying and wave filtering circuit, switch transformer T3, closely optocoupler feedback circuit and power output end, and with TOPSwitch-256 single-chip switching power supply chip composition single-ended flyback topological circuit, the input voltage of power input is that direct voltage 38V is to 375V, described current rectifying and wave filtering circuit includes inductance (L3), its parameter 20 μ H/15A.
Further arranging is that described tight optocoupler feedback circuit is the TL431 type.
Based on TOPSwitch-256(Three-Terminal Off-line PWM Switch) the single-chip switching power supply chip, this chip is that U.S. PI company is in the New Type High frequency Switch Source chip of eighties of last century the mid-90 release; It has only used 3 pins just off-line formula Switching Power Supply must be had graceful N channel MOS field effect transistor; the voltage type PWM controller; the 100khz high-frequency generator; high voltage starts bigoted circuit; reference voltage; be used for loop compensation and adjuster processed in close succession, the repertoires such as error amplifier and failure protection function module have integrated.The Switching Power Supply that the present invention adopts the TOPSwitch device is compared with the auxiliary switching power supply of traditional discrete MOSFET power switch pipe and the integrated control chip control of PWM, it is simple to have circuit structure, with low cost, the advantages such as convenient are made and are debugged in stable performance; Typically be applied as the single-ended flyback topological structure.
Single-ended flyback accessory power supply operation principle of the present invention: this circuit adopts the tight optocoupler feedback circuit of TL431, and its circuit is fairly simple, and voltage regulation performance is also relatively good; It is fit to make up the higher Switching Power Supply of precision.Figure is as implied above for its physical circuit, so-called single-ended pulse-modulated signal power take-off D in the TOPSwitch series that refers to.When inverse-excitation type refers to the power MOSFET conducting, just with electrical power storage on the primary coil of high frequency transformer, only when MOSFET turn-offs, just to secondary transmission of electric energy.Because switching frequency up to 130KHZ, so that high frequency transformer can store fast, releases energy, and can obtain the direct current continuous wave output behind filtering high-frequency rectifier.The basic functional principle of Here it is reaction type circuit.Two feedback loops are regulated duty ratio by the electric current of the control end C of control chip, thereby reach the purpose of voltage stabilizing.
Through debugging, the result who obtains exporting is for stablizing the direct voltage of 15V, essentially no Wen Bo.Show that at oscilloscope the result is as follows: output voltage is 15V, 1% fluctuate, and electric current is 0.5A.
Below in conjunction with specification drawings and specific embodiments the present invention is done further introduction.
Description of drawings
Fig. 1 tradition accessory power supply basic flow sheet;
Fig. 2 circuit connection diagram of the present invention.
Embodiment
Below by embodiment the present invention is carried out concrete description; only be used for the present invention is further specified; can not be interpreted as the restriction to protection range of the present invention, the technician in this field can make some nonessential improvement and adjustment to the present invention according to the content of foregoing invention.
Implementation of the present invention as shown in Figure 2, include power input 1, switch transformer T3, tight optocoupler feedback circuit 2 and power output end 3, and with TOPSwitch-256 single-chip switching power supply chip 4 composition single-ended flyback topological circuits, in addition, the described tight optocoupler feedback circuit of present embodiment is the TL431 type.
Claims (2)
1. one kind based on the accessory power supply from the net photovoltaic generating system, it is characterized in that: include power input, current rectifying and wave filtering circuit, switch transformer (T3), tight optocoupler feedback circuit and power output end, and with TOPSwitch-256 single-chip switching power supply chip composition single-ended flyback topological circuit, the input voltage of power input is that direct voltage 38V is to 375V, described current rectifying and wave filtering circuit includes inductance (L3), its parameter 20 μ H/15A.
2. according to claim 1 a kind of based on the accessory power supply from the net photovoltaic generating system, it is characterized in that: described tight optocoupler feedback circuit is the TL431 type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103743100A CN102904452A (en) | 2012-09-27 | 2012-09-27 | Auxiliary power supply based on off-network photovoltaic power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103743100A CN102904452A (en) | 2012-09-27 | 2012-09-27 | Auxiliary power supply based on off-network photovoltaic power generation system |
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| CN102904452A true CN102904452A (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103743100A Pending CN102904452A (en) | 2012-09-27 | 2012-09-27 | Auxiliary power supply based on off-network photovoltaic power generation system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060098462A1 (en) * | 2003-07-15 | 2006-05-11 | Sanken Electric Co., Ltd. | Power supply and its controlling method |
| CN201230282Y (en) * | 2008-07-14 | 2009-04-29 | 江苏津恒能源科技有限公司 | Auxiliary electric source actuating apparatus for solar photovoltaic combining inverter |
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2012
- 2012-09-27 CN CN2012103743100A patent/CN102904452A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060098462A1 (en) * | 2003-07-15 | 2006-05-11 | Sanken Electric Co., Ltd. | Power supply and its controlling method |
| CN201230282Y (en) * | 2008-07-14 | 2009-04-29 | 江苏津恒能源科技有限公司 | Auxiliary electric source actuating apparatus for solar photovoltaic combining inverter |
Non-Patent Citations (3)
| Title |
|---|
| 许水平等: "基于TOP256Y的开关电源设计", 《电子技术应用》 * |
| 郭光伟等: "TOP244G光伏辅助电源的应用", 《电源技术》 * |
| 郭光伟等: "光伏并网逆变器辅助电源的设计", 《可再生能源》 * |
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Application publication date: 20130130 |