CN203352471U - Photovoltaic inverter-used single end flyback-type switching power supply primary-side circuit - Google Patents
Photovoltaic inverter-used single end flyback-type switching power supply primary-side circuit Download PDFInfo
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- CN203352471U CN203352471U CN 201320462318 CN201320462318U CN203352471U CN 203352471 U CN203352471 U CN 203352471U CN 201320462318 CN201320462318 CN 201320462318 CN 201320462318 U CN201320462318 U CN 201320462318U CN 203352471 U CN203352471 U CN 203352471U
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Abstract
The utility model discloses a photovoltaic inverter-used single end flyback-type switching power supply primary-side circuit. The photovoltaic inverter-used single end flyback-type switching power supply primary-side circuit includes a transformer, a direct current input filtering circuit, a starting circuit, a voltage feedback circuit, an oscillation circuit, a current detection circuit and a buffer absorbing circuit which are sequentially connected between a direct current busbar of a photovoltaic inverter and the transformer, a UC3842 chip which is in matching connection with the starting circuit, the voltage feedback circuit, the oscillation circuit and the current detection circuit, and a peripheral driving circuit which is connected with the UC3842 chip. With the photovoltaic inverter-used single end flyback-type switching power supply primary-side circuit adopted, defects such as small application range and poor stability of power supply in the prior art can be eliminated. The photovoltaic inverter-used single end flyback-type switching power supply primary-side circuit is advantageous in large application range and high stability of power supply.
Description
Technical field
The utility model relates to the photovoltaic power generation technology field, particularly, relates to the former limit of single-end flyback switching power supply circuit for a kind of photovoltaic DC-to-AC converter.
Background technology
Along with the continuous intensification of people to clean energy resource generating attention degree, the parallel networking type photovoltaic inverter has obtained application more and more widely.The photovoltaic DC-to-AC converter normal operation need to be carried out the direct current supply that multichannel is isolated mutually to its switching device driving, voltage/current sensor and control system, generally uses Switching Power Supply to realize this function.
Switching Power Supply need be from the DC bus power taking of photovoltaic array output, and through DC/DC, conversion realizes independently-powered to the multichannel of photovoltaic DC-to-AC converter.Because photovoltaic DC-to-AC converter may be worked under different illumination conditions, and needs in service control DC bus-bar voltage in real time, therefore require Switching Power Supply can adapt to variation the assurance output voltage stabilization of interior input direct voltage in a big way.
Along with the continuous progress of power technology, the control of Switching Power Supply is more integrated, usually the functions such as PWM control and protection is focused on main control chip, to improve reliability and to make peripheral circuit simple.The UC3842 of U.S. Unitrode company exploitation is a kind of high performance novel switched power-supply controller of electric, its frequency is fixed, Single-end output, directly driving transistors and MOSFET, as a kind of novel Current Control Mode IC, its structural electric current and voltage bicyclic system can effectively improve voltage regulation, load regulation, the stability of a system and the transient response characteristic of Switching Power Supply.
In realizing process of the present utility model, the inventor finds in prior art at least to exist the little and defect such as power supply poor stability etc. of the scope of application.
The utility model content
The purpose of this utility model is, for the problems referred to above, proposes the former limit of single-end flyback switching power supply circuit for a kind of photovoltaic DC-to-AC converter, to realize that the scope of application is large and the advantage of the good stability of powering.
For achieving the above object, the technical solution adopted in the utility model is: the former limit of single-end flyback switching power supply circuit for a kind of photovoltaic DC-to-AC converter, comprise transformer, be connected to the DC master row of photovoltaic DC-to-AC converter and direct current input filter circuit, start-up circuit, voltage feedback circuit, oscillating circuit, current detection circuit and snubber circuit between transformer in turn, the UC3842 chip be connected with described pneumatic circuit, voltage feedback circuit, oscillating circuit and current detection circuit respectively, and the peripheral drive circuit be connected with described UC3842 chip.
Further, described direct current input filter circuit, comprise fuse F1 and the first inductor L1 between the second link of DC master row one end that is connected to photovoltaic DC-to-AC converter in turn and transformer primary side coil, be connected to the DC master row other end of photovoltaic DC-to-AC converter and the second inductor L2 between ground, be connected in parallel on the first indicator light branch road and the first capacitor C 1 between the link of DC master row of the link of fuse F1 and the first inductor L1 and the second inductor L2 and photovoltaic DC-to-AC converter, and be connected to the first inductor L1 away from the end of capacitor F1 and the second inductor L2 away from the second capacitor C 2 between DC master row one end of photovoltaic DC-to-AC converter,
Described the first indicator light branch road, the first resistance R 1 and the first LED 1; One end of the first resistance R 1 is connected with the link of the first inductor L1 with fuse F1, the anodic bonding of the other end of the first resistance R 1 and the first LED 1; The negative electrode of the first LED 1 is connected with the link of the DC master row of the second inductor L2 and photovoltaic DC-to-AC converter.
Further, described start-up circuit, comprise the second resistance R 2, the 4th capacitor C 4, the 5th capacitor C 5, switching tube Q2201, the second diode VD2 and the 3rd diode VD3, wherein:
One end of described the second resistance R 2 is connected with the common port of the second capacitor C 2 with the first inductor L1, and the other end of the second resistance R 2 is connected with the 7th pin of UC3842 chip; The 4th capacitor C 4 and the 5th capacitor C 5 are connected in parallel between the 7th pin and ground of UC3842 chip;
The 6th pin of described UC3842 chip, be connected with the control end of switching tube Q2201; The anode of the second diode VD2 is connected with the first link of transformer secondary coil, the negative electrode of the second diode VD2 respectively with the first link of switching tube Q2201, the first link of transformer primary side coil and the anodic bonding of the 3rd diode VD3; The negative electrode of the 3rd diode VD3 is connected to the 7th pin of UC3842 chip.
Further, described voltage feedback circuit, comprise the 4th resistance R 4, the 5th resistance R 5, adjustable resistance R10, the second LED 2 and the RC parallel circuits consisted of the 7th resistance R 7 and the 8th Capacitance parallel connection, wherein:
Described the 4th resistance R 4 and adjustable resistance R10 are connected in turn between the 7th pin and ground of UC3842 chip; The minus earth of described the second LED 2, the anode of the second LED 2 after the 5th resistance R 5 with the anodic bonding of the 3rd diode VD3; Described RC parallel circuits is connected between the common port of the 1st pin of UC3842 chip and the 4th resistance R 4 and adjustable resistance R10.
Further, described oscillating circuit, comprise the 11 resistance R the 11, the 11 capacitor C 11 and the 12 capacitor C 12, wherein:
Described the 11 resistance R 11 and the 12 capacitor C 12 are connected in turn between the 8th pin and ground of UC3842 chip, the 11 capacitor C 11 is connected between the 8th pin and ground of UC3842 chip, and the common port of the 11 resistance R 11 and the 12 capacitor C 12 is connected with the 4th pin of UC3842 chip.
Further, described current detection circuit, comprise the 13 resistance R the 13, the 14 resistance R 14 and the 13 capacitor C 13, wherein:
Described the 13 capacitor C 13 is connected between the 3rd pin and ground of UC3842 chip, described the 13 resistance R 13 and the 14 resistance R 14 are connected in turn between the 3rd pin and ground of UC3842 chip, and the common port of the 13 resistance R 13 and the 14 resistance R 14 is connected to the second link of switching tube Q2201.
Further, described snubber circuit, comprise the first diode VD1, the 4th diode VD4, the RC absorbing circuit composed in parallel by the 3rd resistance R 3 and the 3rd capacitor C 3, the 9th resistance R 9 and the tenth capacitor C 10, wherein:
The anode of described the first diode VD1 is connected with the negative electrode of the second diode VD2, the negative electrode of the first diode VD1 is connected with an end of RC absorbing circuit, and the other end of RC absorbing circuit is connected away from the end of fuse F1 with the first inductor L1 with the second link of transformer primary side coil respectively;
Described the tenth capacitor C 10 and the 9th resistance R 9 are connected in turn between the first link and the second link of switching tube Q2201, the anode of the 4th diode VD4 is connected with the common port of the 9th resistance R 9 with the tenth capacitor C 10, and the negative electrode of the 4th diode VD4 is connected with the second link of switching tube Q2201.
Further, described drive circuit, comprise the 8th resistance R 8 and the 12 resistance R 12, wherein:
Described the 8th resistance R 8 is connected between the 6th pin of the control end of switching tube Q2201 and UC3842 chip, and the 12 resistance R 12 is connected between the control end and ground of switching tube Q2201.
Further, described switching tube Q2201 is metal-oxide-semiconductor, and the grid of described metal-oxide-semiconductor is that control end, source electrode are that the second link, drain electrode are the first link.
The former limit of single-end flyback switching power supply circuit for the photovoltaic DC-to-AC converter of each embodiment of the utility model, owing to comprising transformer, be connected to the DC master row of photovoltaic DC-to-AC converter and direct current input filter circuit, start-up circuit, voltage feedback circuit, oscillating circuit, current detection circuit and snubber circuit between transformer in turn, the UC3842 chip be connected with start-up circuit, voltage feedback circuit, oscillating circuit and current detection circuit respectively, and the peripheral drive circuit be connected with the UC3842 chip; The wide fluctuations that can adapt to input direct voltage can guarantee as the inverter stable power-supplying steadily in the long term when different direct current input; Thereby can overcome the defect of the little and power supply poor stability of the scope of application in prior art, to realize the advantage of the large and power supply good stability of the scope of application.
Other features and advantages of the utility model will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the utility model.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
The accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms the part of specification, with embodiment mono-of the present utility model, is used from explanation the utility model, does not form restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the operation principle schematic diagram of the utility model photovoltaic DC-to-AC converter with the former limit of single-end flyback switching power supply circuit.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein is only for description and interpretation the utility model, and be not used in restriction the utility model.
According to the utility model embodiment, as shown in Figure 1, the former limit of single-end flyback switching power supply circuit for a kind of photovoltaic DC-to-AC converter is provided, comprise transformer, be connected to the DC master row of photovoltaic DC-to-AC converter and direct current input filter circuit, start-up circuit, voltage feedback circuit, oscillating circuit, current detection circuit and snubber circuit between transformer in turn, the UC3842 chip be connected with start-up circuit, voltage feedback circuit, oscillating circuit and current detection circuit respectively, and the peripheral drive circuit be connected with the UC3842 chip.
Particularly, above-mentioned direct current input filter circuit, comprise fuse F1 and the first inductor L1 between the second link of DC master row one end that is connected to photovoltaic DC-to-AC converter in turn and transformer primary side coil, be connected to the DC master row other end of photovoltaic DC-to-AC converter and the second inductor L2 between ground, be connected in parallel on the first indicator light branch road and the first capacitor C 1 between the link of DC master row of the link of fuse F1 and the first inductor L1 and the second inductor L2 and photovoltaic DC-to-AC converter, and be connected to the first inductor L1 away from the end of capacitor F1 and the second inductor L2 away from the second capacitor C 2 between DC master row one end of photovoltaic DC-to-AC converter, the first indicator light branch road, the first resistance R 1 and the first LED 1, one end of the first resistance R 1 is connected with the link of the first inductor L1 with fuse F1, the anodic bonding of the other end of the first resistance R 1 and the first LED 1, the negative electrode of the first LED 1 is connected with the link of the DC master row of the second inductor L2 and photovoltaic DC-to-AC converter.
Above-mentioned start-up circuit, comprise the second resistance R 2, the 4th capacitor C 4, the 5th capacitor C 5, switching tube Q2201, the second diode VD2 and the 3rd diode VD3, wherein: an end of the second resistance R 2 is connected with the common port of the second capacitor C 2 with the first inductor L1, and the other end of the second resistance R 2 is connected with the 7th pin of UC3842 chip; The 4th capacitor C 4 and the 5th capacitor C 5 are connected in parallel between the 7th pin and ground of UC3842 chip; The 6th pin of UC3842 chip, be connected with the control end of switching tube Q2201; The anode of the second diode VD2 is connected with the first link of transformer secondary coil, the negative electrode of the second diode VD2 respectively with the first link of switching tube Q2201, the first link of transformer primary side coil and the anodic bonding of the 3rd diode VD3; The negative electrode of the 3rd diode VD3 is connected to the 7th pin of UC3842 chip.Switching tube Q2201 is metal-oxide-semiconductor, and the grid of metal-oxide-semiconductor is that control end, source electrode are that the second link, drain electrode are the first link.
Above-mentioned voltage feedback circuit, comprise the 4th resistance R 4, the 5th resistance R 5, adjustable resistance R10, the second LED 2 and the RC parallel circuits consisted of the 7th resistance R 7 and the 8th Capacitance parallel connection, wherein: the 4th resistance R 4 and adjustable resistance R10 are connected in turn between the 7th pin and ground of UC3842 chip; The minus earth of the second LED 2, the anode of the second LED 2 after the 5th resistance R 5 with the anodic bonding of the 3rd diode VD3; The RC parallel circuits is connected between the common port of the 1st pin of UC3842 chip and the 4th resistance R 4 and adjustable resistance R10.
Above-mentioned oscillating circuit, comprise the 11 resistance R the 11, the 11 capacitor C 11 and the 12 capacitor C 12, wherein: the 11 resistance R 11 and the 12 capacitor C 12 are connected in turn between the 8th pin and ground of UC3842 chip, the 11 capacitor C 11 is connected between the 8th pin and ground of UC3842 chip, and the common port of the 11 resistance R 11 and the 12 capacitor C 12 is connected with the 4th pin of UC3842 chip.
Above-mentioned current detection circuit, comprise the 13 resistance R the 13, the 14 resistance R 14 and the 13 capacitor C 13, wherein: the 13 capacitor C 13 is connected between the 3rd pin and ground of UC3842 chip, the 13 resistance R 13 and the 14 resistance R 14 are connected in turn between the 3rd pin and ground of UC3842 chip, and the common port of the 13 resistance R 13 and the 14 resistance R 14 is connected to the second link of switching tube Q2201.
Above-mentioned snubber circuit, comprise the first diode VD1, the 4th diode VD4, the RC absorbing circuit composed in parallel by the 3rd resistance R 3 and the 3rd capacitor C 3, the 9th resistance R 9 and the tenth capacitor C 10, wherein: the anode of the first diode VD1 is connected with the negative electrode of the second diode VD2, the negative electrode of the first diode VD1 is connected with an end of RC absorbing circuit, and the other end of RC absorbing circuit is connected away from the end of fuse F1 with the first inductor L1 with the second link of transformer primary side coil respectively; The tenth capacitor C 10 and the 9th resistance R 9 are connected in turn between the first link and the second link of switching tube Q2201, the anode of the 4th diode VD4 is connected with the common port of the 9th resistance R 9 with the tenth capacitor C 10, and the negative electrode of the 4th diode VD4 is connected with the second link of switching tube Q2201.
Above-mentioned drive circuit, comprise the 8th resistance R 8 and the 12 resistance R 12, and wherein: the 8th resistance R 8 is connected between the 6th pin of the control end of switching tube Q2201 and UC3842 chip, and the 12 resistance R 12 is connected between the control end and ground of switching tube Q2201.
The former limit of single-end flyback switching power supply circuit for the photovoltaic DC-to-AC converter of above-described embodiment, adopt single-end flyback switching power supply, and when the switching tube conducting, the former limit of high frequency transformer current flowing, become magnetic energy by electric energy and store; And, when switching tube ends, the magnetic energy that high frequency transformer just will originally store becomes electric energy, at secondary output electric energy, power to the load.Single-end flyback switching power supply has interrupted and continuous 2 kinds of mode of operations.
The hardware configuration of single-end flyback switching power supply is referring to Fig. 1.Single-end flyback switching power supply mainly is comprised of the peripheral drive circuit of direct current input filter circuit, start-up circuit, voltage feedback circuit, oscillating circuit, current detection circuit, snubber circuit and UC3842.When the direct voltage of input changes, UC3842 can pass through the duty ratio of voltage feedback loop adjusting pulsewidth, makes the direct voltage of transformer secondary keep stable.
The direct current input filter circuit, from the DC master row power taking of photovoltaic DC-to-AC converter, the function of L1, L2, C1 and C2 is the filtering high fdrequency component, obtains stable DC input voitage, guarantees good Electro Magnetic Compatibility.Fuse F1 plays the effect of overcurrent protection, has designed one emitting led 1 in circuit in order to indicate the direct current input.
The start-up course of start-up circuit is as follows: direct voltage increases gradually, and charges to capacitor C 4, C5 by R2, and when the voltage on electric capacity reaches the starting resistor 16V of UC3842, UC3842 starts working.The pin 6 output pulse width modulation signals of UC3842 are controlled the switch motion that MOSFET carries out high frequency, thereby make transformer ceaselessly discharge and recharge and by electromagnetic energy transfer to secondary, after this feeding back the direct voltage that the interchange output of winding takes in start-up course after VD2 and VD3 rectifying and wave-filtering is the UC3842 power supply.
Voltage feedback circuit, for guaranteeing the stability of output dc voltage, is got a secondary winding of high frequency transformer as voltage feedback loop.During the Switching Power Supply normal operation, the output of transformer feedback winding is the UC3842 power supply on the one hand after VD2 and VD3 rectifying and wave-filtering, input the reverse input end of UC3842 internal error amplifier as Voltage Feedback through the dividing potential drop of R4 and adjustable resistance R10 on the other hand, another LED2 is set in order to indication feedback herein.In addition, between the pin 1 of UC3842 and pin 2, external RC parallel circuits forms the PI compensating circuit, in order to improve its closed loop and frequency characteristic.When output voltage increases, the input of pin 2 increases, and the UC3842 duty ratio of regulation output pulsewidth accordingly keeps stable to guarantee output voltage.R10 is designed to adjustable resistance, the output size that can when debugging, regulate each road direct voltage.Simultaneously, the starting resistor of all right decision systems of the cooperation of R2, R4, R10.
Oscillating circuit, be comprised of R11, C11 and C12, and the reference voltage output with UC3842 pin 8, make R11 and C12 form oscillating circuit, and C11 plays bypass filtering, and the sawtooth waveform access pin 4 of vibration determines the switching frequency of its power supply.Switching frequency is excessive increases switching tube loss and heating, switching frequency is too little is unfavorable for bringing into play the characteristic that the high frequency transformer volume is little, and the output DC pulse is large, gets R11=20 k Ω, C12=2.2 nF, frequency of oscillation f=1.72 * 103/20 * 2.2)=40(kHz).
The electric current that current detection circuit flows through for detection of switching tube, by current sampling resistor, R14 transfers current signal to voltage signal, by access UC3842 pin 3 after R13 and C13 filtering spike, forms the current feedback link and participates in the output of regulating impulse sequence.When the voltage on R14 being detected surpasses 1 V, the UC3842 overcurrent protection function starts, and no longer exports pulse, plays a protective role.C13, can use 2-3 the further noise decrease of little Capacitance parallel connection.
Snubber circuit is by RC absorbing circuit in parallel, VD4, R9, C10 form, and simultaneously for the former limit of the high frequency transformer of single-ended flyback power supply winding, designed the absorbing circuit that VD1, R3, C3 form and played a protective role.
Drive circuit is by external driving resistance R 8 driving grids of the pin 6 of UC3842, and the effect of R12 is the peak limiting drive current.
In sum, the former limit of single-end flyback switching power supply circuit for the photovoltaic DC-to-AC converter of the utility model the various embodiments described above at least can reach following beneficial effect:
The output dc voltage ripple is in the acceptable scope, the wide fluctuations that can adapt to input direct voltage, the advantage such as can be steadily in the long term when different direct currents input, guarantee that its circuit has stronger versatility, peripheral circuit is simple, installation and debugging are easy for the inverter stable power-supplying, function admirable, price are low.
Finally it should be noted that: the foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, although with reference to previous embodiment, the utility model is had been described in detail, for a person skilled in the art, its technical scheme that still can put down in writing aforementioned each embodiment is modified, or part technical characterictic wherein is equal to replacement.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (9)
1. the former limit of single-end flyback switching power supply circuit for a photovoltaic DC-to-AC converter, it is characterized in that, comprise transformer, be connected to the DC master row of photovoltaic DC-to-AC converter and direct current input filter circuit, start-up circuit, voltage feedback circuit, oscillating circuit, current detection circuit and snubber circuit between transformer in turn, the UC3842 chip be connected with described start-up circuit, voltage feedback circuit, oscillating circuit and current detection circuit respectively, and the peripheral drive circuit be connected with described UC3842 chip.
2. the former limit of single-end flyback switching power supply circuit for photovoltaic DC-to-AC converter according to claim 1, it is characterized in that, described direct current input filter circuit, comprise fuse F1 and the first inductor L1 between the second link of DC master row one end that is connected to photovoltaic DC-to-AC converter in turn and transformer primary side coil, be connected to the DC master row other end of photovoltaic DC-to-AC converter and the second inductor L2 between ground, be connected in parallel on the first indicator light branch road and the first capacitor C 1 between the link of DC master row of the link of fuse F1 and the first inductor L1 and the second inductor L2 and photovoltaic DC-to-AC converter, and be connected to the first inductor L1 away from the end of capacitor F1 and the second inductor L2 away from the second capacitor C 2 between DC master row one end of photovoltaic DC-to-AC converter,
Described the first indicator light branch road, the first resistance R 1 and the first LED 1; One end of the first resistance R 1 is connected with the link of the first inductor L1 with fuse F1, the anodic bonding of the other end of the first resistance R 1 and the first LED 1; The negative electrode of the first LED 1 is connected with the link of the DC master row of the second inductor L2 and photovoltaic DC-to-AC converter.
3. the former limit of single-end flyback switching power supply circuit for photovoltaic DC-to-AC converter according to claim 2, it is characterized in that, described start-up circuit, comprise the second resistance R 2, the 4th capacitor C 4, the 5th capacitor C 5, switching tube Q2201, the second diode VD2 and the 3rd diode VD3, wherein:
One end of described the second resistance R 2 is connected with the common port of the second capacitor C 2 with the first inductor L1, and the other end of the second resistance R 2 is connected with the 7th pin of UC3842 chip; The 4th capacitor C 4 and the 5th capacitor C 5 are connected in parallel between the 7th pin and ground of UC3842 chip;
The 6th pin of described UC3842 chip, be connected with the control end of switching tube Q2201; The anode of the second diode VD2 is connected with the first link of transformer secondary coil, the negative electrode of the second diode VD2 respectively with the first link of switching tube Q2201, the first link of transformer primary side coil and the anodic bonding of the 3rd diode VD3; The negative electrode of the 3rd diode VD3 is connected to the 7th pin of UC3842 chip.
4. the former limit of single-end flyback switching power supply circuit for photovoltaic DC-to-AC converter according to claim 3, it is characterized in that, described voltage feedback circuit, comprise the 4th resistance R 4, the 5th resistance R 5, adjustable resistance R10, the second LED 2 and the RC parallel circuits formed by the 7th resistance R 7 and the 8th Capacitance parallel connection, wherein:
Described the 4th resistance R 4 and adjustable resistance R10 are connected in turn between the 7th pin and ground of UC3842 chip; The minus earth of described the second LED 2, the anode of the second LED 2 after the 5th resistance R 5 with the anodic bonding of the 3rd diode VD3; Described RC parallel circuits is connected between the common port of the 1st pin of UC3842 chip and the 4th resistance R 4 and adjustable resistance R10.
5. the former limit of single-end flyback switching power supply circuit for photovoltaic DC-to-AC converter according to claim 4, is characterized in that, described oscillating circuit, comprise the 11 resistance R the 11, the 11 capacitor C 11 and the 12 capacitor C 12, wherein:
Described the 11 resistance R 11 and the 12 capacitor C 12 are connected in turn between the 8th pin and ground of UC3842 chip, the 11 capacitor C 11 is connected between the 8th pin and ground of UC3842 chip, and the common port of the 11 resistance R 11 and the 12 capacitor C 12 is connected with the 4th pin of UC3842 chip.
6. the former limit of single-end flyback switching power supply circuit for photovoltaic DC-to-AC converter according to claim 5, is characterized in that, described current detection circuit, comprise the 13 resistance R the 13, the 14 resistance R 14 and the 13 capacitor C 13, wherein:
Described the 13 capacitor C 13 is connected between the 3rd pin and ground of UC3842 chip, described the 13 resistance R 13 and the 14 resistance R 14 are connected in turn between the 3rd pin and ground of UC3842 chip, and the common port of the 13 resistance R 13 and the 14 resistance R 14 is connected to the second link of switching tube Q2201.
7. the former limit of single-end flyback switching power supply circuit for photovoltaic DC-to-AC converter according to claim 6, it is characterized in that, described snubber circuit, comprise the first diode VD1, the 4th diode VD4, the RC absorbing circuit composed in parallel by the 3rd resistance R 3 and the 3rd capacitor C 3, the 9th resistance R 9 and the tenth capacitor C 10, wherein:
The anode of described the first diode VD1 is connected with the negative electrode of the second diode VD2, the negative electrode of the first diode VD1 is connected with an end of RC absorbing circuit, and the other end of RC absorbing circuit is connected away from the end of fuse F1 with the first inductor L1 with the second link of transformer primary side coil respectively;
Described the tenth capacitor C 10 and the 9th resistance R 9 are connected in turn between the first link and the second link of switching tube Q2201, the anode of the 4th diode VD4 is connected with the common port of the 9th resistance R 9 with the tenth capacitor C 10, and the negative electrode of the 4th diode VD4 is connected with the second link of switching tube Q2201.
8. the former limit of single-end flyback switching power supply circuit for photovoltaic DC-to-AC converter according to claim 7, is characterized in that, described drive circuit, comprise the 8th resistance R 8 and the 12 resistance R 12, wherein:
Described the 8th resistance R 8 is connected between the 6th pin of the control end of switching tube Q2201 and UC3842 chip, and the 12 resistance R 12 is connected between the control end and ground of switching tube Q2201.
9. according to the described photovoltaic DC-to-AC converter of any one in the claim 3-8 former limit of single-end flyback switching power supply circuit, it is characterized in that, described switching tube Q2201 is metal-oxide-semiconductor, and the grid of described metal-oxide-semiconductor is that control end, source electrode are that the second link, drain electrode are the first link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320462318 CN203352471U (en) | 2013-07-31 | 2013-07-31 | Photovoltaic inverter-used single end flyback-type switching power supply primary-side circuit |
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| CN 201320462318 CN203352471U (en) | 2013-07-31 | 2013-07-31 | Photovoltaic inverter-used single end flyback-type switching power supply primary-side circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467441A (en) * | 2014-12-24 | 2015-03-25 | 全天自动化能源科技（东莞）有限公司 | Auxiliary power circuit for photovoltaic inverter |
| CN109068466A (en) * | 2018-09-17 | 2018-12-21 | 吉林大学 | A kind of double inverter applied to trolley coach fluorescent lamp |
| CN109861573A (en) * | 2019-03-07 | 2019-06-07 | 苏州赛得尔智能科技有限公司 | A low switching loss power inverter |
| CN110071642A (en) * | 2019-05-10 | 2019-07-30 | 佛山职业技术学院 | A kind of switching circuit and its control circuit, control method |
-
2013
- 2013-07-31 CN CN 201320462318 patent/CN203352471U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467441A (en) * | 2014-12-24 | 2015-03-25 | 全天自动化能源科技（东莞）有限公司 | Auxiliary power circuit for photovoltaic inverter |
| CN109068466A (en) * | 2018-09-17 | 2018-12-21 | 吉林大学 | A kind of double inverter applied to trolley coach fluorescent lamp |
| CN109861573A (en) * | 2019-03-07 | 2019-06-07 | 苏州赛得尔智能科技有限公司 | A low switching loss power inverter |
| CN110071642A (en) * | 2019-05-10 | 2019-07-30 | 佛山职业技术学院 | A kind of switching circuit and its control circuit, control method |
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