CN209930144U - Double-tube flyback switching power supply - Google Patents
Double-tube flyback switching power supply Download PDFInfo
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- CN209930144U CN209930144U CN201920675118.2U CN201920675118U CN209930144U CN 209930144 U CN209930144 U CN 209930144U CN 201920675118 U CN201920675118 U CN 201920675118U CN 209930144 U CN209930144 U CN 209930144U
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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 utility model relates to a double-barrelled flyback switching power supply, include: the rectifying circuit is connected with the input end, receives the photovoltaic voltage generated by the solar photovoltaic power generation system connected to the input end, rectifies the photovoltaic voltage and outputs the rectified voltage; the control circuit is connected with the rectifying circuit; the double-tube flyback switching circuit is connected with the control circuit and the rectifying circuit and is switched on or switched off according to a switching control signal output by the control circuit; and the voltage conversion circuit is connected with the double-tube flyback switching circuit and is used for converting the rectified voltage to generate an output voltage. The double-tube flyback switching power supply can meet the requirement of wide-range input voltage, can stably output, can ensure that a solar photovoltaic grid-connected power generation system stably supplies power to a post-stage circuit and devices in an input range, ensures the stability and reliability of the system, does not need to be maintained frequently, and is convenient to use.
Description
Technical Field
The utility model relates to a solar energy power generation drive field, more specifically say, relate to a double-barrelled flyback switching power supply.
Background
In order to deal with the energy crisis, various new energy technologies are continuously emerging, wherein the new energy technologies comprise solar photovoltaic power generation.
The photovoltaic power generation is based on the principle of photovoltaic effect, solar energy is directly converted into electric energy by using a solar cell, and the photovoltaic power generation can be used independently and can also be used for grid-connected power generation. However, since the battery voltage in the solar photovoltaic power generation system is high and wide, such as 120-.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a double-barrelled flyback switching power supply is provided.
The utility model provides a technical scheme that its technical problem adopted is: a double-tube flyback switching power supply is constructed, and comprises:
the rectifying circuit is connected with the input end, receives the photovoltaic voltage generated by the solar photovoltaic power generation system connected to the input end, and rectifies the photovoltaic voltage to output rectified voltage;
the control circuit is connected with the rectifying circuit;
the double-tube flyback switching circuit is connected with the control circuit and the rectifying circuit and is switched on or switched off according to a switching control signal output by the control circuit;
and the voltage conversion circuit is connected with the double-tube flyback switch circuit and is used for converting the rectified voltage to generate output voltage.
Wherein, still include: and the secondary rectifying and filtering circuit is arranged between the output end of the voltage conversion circuit and the output end of the switching power supply and is used for rectifying and filtering the output voltage generated by the voltage output circuit.
Wherein, still include: and the feedback circuit is connected with the output end of the switching power supply, samples the output voltage and feeds back the acquired sampling signal to the control circuit.
Wherein the feedback circuit comprises: a sampling circuit and a photoelectric coupler;
one end of the sampling circuit is connected with the output end of the switching power supply, the other end of the sampling circuit is connected with the input end of the photoelectric coupler, and the output end of the photoelectric coupler is connected with the feedback detection end of the control circuit.
Wherein, still include: and the input undervoltage protection circuit is connected with the rectification circuit and the undervoltage control end of the control circuit.
The rectification circuit is a half-wave unidirectional rectification circuit.
Wherein, still include: and the EMI filter circuit is arranged between the input end and the rectifying circuit.
Wherein, the rectifier circuit includes: a diode D101, a diode D102, a capacitor C101, a capacitor C102, a capacitor C103 and a capacitor C104;
the anode of the diode D101 is connected to the first output terminal of the EMI filter circuit, the cathode of the diode D101 is connected to the anode of the diode D102, the cathode of the diode D102 is connected to the first terminal of the capacitor C101, the second terminal of the capacitor C101 is connected to the first terminal of the capacitor C102, the second terminal of the capacitor C102 is connected to the first terminal of the capacitor C103, the second terminal of the capacitor C103 is connected to the first terminal of the capacitor C104, the second terminal of the capacitor C104 and the second output terminal of the EMI filter circuit are grounded, and the connection terminal between the second terminal of the capacitor C103 and the first terminal of the capacitor C104 is connected to the control circuit;
the cathode of the diode D102 and the first end of the capacitor C101 are output ends of the rectifier circuit.
Wherein, two double-barrelled flyback switch circuit includes: the first switch tube and the second switch tube;
the first end of the first switching tube is connected with the first control end of the control circuit, the second end of the first switching tube is connected with the output end of the rectifying circuit, and the third end of the first switching tube is connected with the first input end of the voltage conversion circuit;
the first end of the second switch tube is connected with the second control end of the control circuit, the second end of the second switch tube is connected with the second input end of the voltage conversion circuit, and the third end of the second switch tube is grounded through a resistor R130.
The first switch tube and the second switch tube are both MOS tubes.
Implement the utility model discloses a double-barrelled flyback switching power supply has following beneficial effect: the method comprises the following steps: the rectifying circuit is connected with the input end, receives the photovoltaic voltage generated by the solar photovoltaic power generation system connected to the input end, rectifies the photovoltaic voltage and outputs the rectified voltage; the control circuit is connected with the rectifying circuit; the double-tube flyback switching circuit is connected with the control circuit and the rectifying circuit and is switched on or switched off according to a switching control signal output by the control circuit; and the voltage conversion circuit is connected with the double-tube flyback switching circuit and is used for converting the rectified voltage to generate an output voltage. The double-tube flyback switching power supply can meet the requirement of wide-range input voltage, can stably output, can ensure that a solar photovoltaic grid-connected power generation system stably supplies power to a post-stage circuit and devices in an input range, ensures the stability and reliability of the system, does not need to be maintained frequently, and is convenient to use.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of a double-tube flyback switching power supply of the present invention;
fig. 2 is a schematic circuit diagram of the double-transistor flyback switching power supply of the present invention.
Detailed Description
For a clearer understanding of the technical features, objects, and effects of the present invention, reference will now be made to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of a double-transistor flyback switching power supply according to an embodiment of the present invention is shown. The double-tube flyback switching circuit can be applied to the drive control of a solar photovoltaic grid-connected power generation system, meets the requirement of wide-range input voltage (such as 200-1500V), can stably output in the input voltage range of 200-1500V, and can enable the solar photovoltaic grid-connected power generation system to stably supply power for a post-stage circuit and devices (such as a low-voltage controller, an IGBT driver and an LCD) in the input range specified by a protocol when being applied to the solar photovoltaic grid-connected power generation system.
As shown in fig. 1, the dual flyback switching circuit may include: a rectifier circuit 12 connected to the input terminal, receiving the photovoltaic voltage generated by the solar photovoltaic power generation system connected to the input terminal, and rectifying the photovoltaic voltage to output a rectified voltage; a control circuit 13 connected to the rectifier circuit 12; a double-tube flyback switching circuit 14 connected with the control circuit 13 and the rectifying circuit 12 and switched on or off according to a switching control signal output by the control circuit 13; and a voltage conversion circuit 15 connected to the double flyback switching circuit 14 for converting the rectified voltage to generate an output voltage.
And the rectifying circuit 12 is used for rectifying the input photovoltaic voltage to output a rectified voltage. Optionally, the rectifier circuit 12 is a half-wave unidirectional rectifier circuit 12. Further, the rectifying circuit 12 can perform both a voltage withstanding function and an anti-reverse function. The rectifying circuit 12 is arranged at the input end, so that the photovoltaic voltage can not be damaged when being 1500V, the function of preventing the reverse connection of the battery can be achieved, and a rear-stage circuit is effectively protected.
The control circuit 13 is configured to dynamically monitor the output voltage, and dynamically control the on/off of the dual-transistor flyback switch circuit 14 according to the output voltage output switch control signal, so as to dynamically adjust the output voltage, thereby meeting the power supply requirement of the load. Optionally, control circuit 13 may include a controller, and this controller may be microcontroller such as singlechip etc. wherein, the singlechip can suitably select current singlechip that has this control function according to the circuit control demand, the utility model discloses do not do specifically and restrict. Further, the switching control signal output by the control circuit 13 is a PWM control signal.
And the double-tube flyback switching circuit 14 is used for switching on or off according to the switching control signal output by the control circuit 13 so as to regulate the output voltage. Optionally, the dual flyback switch circuit 14 may be implemented by a switch tube, wherein the dual flyback switch circuit 14 may include two switch tubes, and the two switch tubes are turned on and turned off simultaneously. Further, the two switching tubes can be MOS tubes, and the two MOS tubes can be selected from the MOS tubes with the specification of 6A/900V, so that the series withstand voltage of the two MOS tubes is 1800V, and further the two MOS tubes can not be damaged under the worst condition when the photovoltaic voltage is 1500V.
The embodiment of the utility model provides an in, voltage conversion circuit 15 can include the transformer, as shown in fig. 2, the first input of transformer is voltage conversion circuit 15's first input, and the second input of transformer is voltage conversion circuit 15's second input, and the first output of transformer is voltage conversion circuit 15's output, and the second output ground connection of transformer.
Further, as shown in fig. 1, the dual-transistor flyback switching power supply may further include: and a feedback circuit 17 connected to the output terminal of the switching power supply, sampling the output voltage, and feeding back the sampled signal to the control circuit 13.
Optionally, the feedback circuit 17 includes: sampling circuit and photoelectric coupler.
One end of the sampling circuit is connected with the output end of the switching power supply, the other end of the sampling circuit is connected with the input end of the photoelectric coupler, and the output end of the photoelectric coupler is connected with the feedback detection end of the control circuit 13. It can be understood that the sampling circuit can adopt the existing voltage sampling circuit, and the utility model discloses do not do specifically and restrict.
By setting the feedback circuit 17, real-time sampling of the output voltage can be realized, and a sampling signal is fed back to the control circuit 13, so that the control circuit 13 can monitor the output voltage of the output end in real time, and output a corresponding switch control signal to the double-tube flyback switch circuit 14 according to the sampling signal, so as to control the on or off of the double-tube flyback switch circuit 14, thereby dynamically adjusting the output voltage of the output end, further enabling the output voltage to be stably output, and meeting the load requirement.
Further, the double-tube flyback switching power supply may further include: and the input undervoltage protection circuit 18 is connected with the undervoltage control ends of the rectification circuit 12 and the control circuit 13. Optionally, the input undervoltage protection circuit 18 may be an independent protection circuit, or may be implemented by an undervoltage protection function of the controller.
It is understood that by setting the undervoltage protection circuit 18, the control circuit 13 can directly turn off the dual-transistor anti-assignment switch circuit when the photovoltaic voltage is lower than a threshold (e.g. 180V) to ensure that the circuit is not damaged.
Further, the double-tube flyback switching power supply may further include: and an EMI filter circuit 11 disposed between the input terminal and the rectifier circuit 12.
By arranging the EMI filter circuit 11 at the input end, electromagnetic interference can be prevented, the power supply can meet relevant electrical requirements, the reliability of the power supply is improved, and the electromagnetic pollution of the power supply to a power grid is reduced.
Further, the double-tube flyback switching power supply may further include: the secondary rectifying and filtering circuit 16 is arranged between the output end and the output end of the voltage conversion circuit, and the output voltage output by the voltage conversion circuit can be rectified and filtered through the secondary rectifying and filtering circuit 16 and then output to the output end, so that the stability and reliability of the output voltage are improved. Alternatively, the secondary rectifying and filtering circuit 16 may be an existing rectifying and filtering circuit, and the present invention is not limited to this embodiment.
In one particular embodiment, as shown in FIG. 2:
the EMI filter circuit 11 includes: a fuse F101, a capacitor CX102, a thermistor NTC101, and an inductor LF 101. The rectifier circuit 12 includes: diode D101, diode D102, capacitor C101, capacitor C102, capacitor C103, and capacitor C104. The control circuit 13 includes a controller. The double-transistor flyback switching circuit 14 includes a first switching transistor and a second switching transistor, wherein the first switching transistor is a MOS transistor Q1, and the second switching transistor is a MOS transistor Q2.
The first end of the fuse F101 is connected with the positive INPUT interface (INPUT +) of the INPUT end, the second end of the fuse F101 is connected with the first end of the capacitor CX101 and the first end of the inductor LF101, the second end of the capacitor CX101 is connected with the first end of the capacitor CX102, the second end of the capacitor CX102 is connected with the second end of the inductor LF101 and the second end of the thermistor NTC101, and the first end of the thermistor NTC101 is connected with the negative INPUT interface (INPUT-) of the INPUT end; the third terminal of the inductor LF101 is connected to the anode of the diode D101 as the first output terminal of the EMI filter circuit 11, and the fourth terminal of the inductor LF101 is grounded as the second output terminal of the EMI filter circuit 11.
The anode of the diode D101 is connected to the first output terminal of the EMI filter circuit 11, the cathode of the diode D101 is connected to the anode of the diode D102, the cathode of the diode D102 is connected to the first terminal of the capacitor C101, the second terminal of the capacitor C101 is connected to the first terminal of the capacitor C102, the second terminal of the capacitor C102 is connected to the first terminal of the capacitor C103, the second terminal of the capacitor C103 is connected to the first terminal of the capacitor C104, the second terminal of the capacitor C104 and the second output terminal of the EMI filter circuit 11 are grounded, and the connection end of the second terminal of the capacitor C103 and the first terminal of the capacitor C104 is connected to the control circuit 13; the cathode of the diode D102 and the first end of the capacitor C101 are output terminals of the rectifier circuit 12. It can be understood that the diode D101 and the diode D102 can play a role of reverse connection prevention, and the four capacitors connected in series, that is, the capacitor C101, the capacitor C102, the capacitor C103 and the capacitor C104, are connected in series for filtering, and the specification of withstand voltage of 400V can be selected, so that the total withstand voltage of the four capacitors is 1600V, which can ensure that the four capacitors are not damaged even when the photovoltaic voltage is 1500V, and effectively protect the circuit.
The first end of the first switch tube is connected with the first control end of the control circuit 13, the second end of the first switch tube is connected with the output end of the rectifying circuit 12, and the third end of the first switch tube is connected with the first input end of the voltage conversion circuit 15; the first end of the second switch tube is connected to the second control end of the control circuit 13, the second end of the second switch tube is connected to the second input end of the voltage conversion circuit 15, and the third end of the second switch tube is grounded through a resistor R130.
The first end of the first switch tube is the grid electrode of the MOS tube Q1, the second end of the first switch tube is the drain electrode of the MOS tube Q1, and the third end of the first switch tube is the source electrode of the MOS tube Q1. The first end of the second switch is the grid of the MOS transistor Q2, the second end of the first switch is the drain of the MOS transistor Q2, and the third end of the second switch is the source of the MOS transistor Q2.
By implementing the double-tube flyback switching power supply, the use requirement of an ultra-wide voltage range can be met, the input voltage can reach 200-1500V, the output voltage can be controlled within +/-5%, the ripple wave can be controlled within 300mV, and the energy efficiency can reach 6 levels or even above.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (10)
1. A double-tube flyback switching power supply is characterized by comprising:
the rectifying circuit is connected with the input end, receives the photovoltaic voltage generated by the solar photovoltaic power generation system connected to the input end, and rectifies the photovoltaic voltage to output rectified voltage;
the control circuit is connected with the rectifying circuit;
the double-tube flyback switching circuit is connected with the control circuit and the rectifying circuit and is switched on or switched off according to a switching control signal output by the control circuit;
and the voltage conversion circuit is connected with the double-tube flyback switch circuit and is used for converting the rectified voltage to generate output voltage.
2. The dual-transistor flyback switching power supply of claim 1, further comprising: and the secondary rectifying and filtering circuit is arranged between the output end of the voltage conversion circuit and the output end of the switching power supply and is used for rectifying and filtering the output voltage generated by the voltage output circuit.
3. The dual-transistor flyback switching power supply of claim 1, further comprising: and the feedback circuit is connected with the output end of the switching power supply, samples the output voltage and feeds back the acquired sampling signal to the control circuit.
4. The dual-transistor flyback switching power supply of claim 3, wherein the feedback circuit comprises: a sampling circuit and a photoelectric coupler;
one end of the sampling circuit is connected with the output end of the switching power supply, the other end of the sampling circuit is connected with the input end of the photoelectric coupler, and the output end of the photoelectric coupler is connected with the feedback detection end of the control circuit.
5. The dual-transistor flyback switching power supply of claim 1, further comprising: and the input undervoltage protection circuit is connected with the rectification circuit and the undervoltage control end of the control circuit.
6. The dual-transistor flyback switching power supply of claim 1, wherein the rectifier circuit is a half-wave unidirectional rectifier circuit.
7. The dual-transistor flyback switching power supply of claim 1, further comprising: and the EMI filter circuit is arranged between the input end and the rectifying circuit.
8. The dual-transistor flyback switching power supply of claim 7, wherein the rectification circuit comprises: a diode D101, a diode D102, a capacitor C101, a capacitor C102, a capacitor C103 and a capacitor C104;
the anode of the diode D101 is connected to the first output terminal of the EMI filter circuit, the cathode of the diode D101 is connected to the anode of the diode D102, the cathode of the diode D102 is connected to the first terminal of the capacitor C101, the second terminal of the capacitor C101 is connected to the first terminal of the capacitor C102, the second terminal of the capacitor C102 is connected to the first terminal of the capacitor C103, the second terminal of the capacitor C103 is connected to the first terminal of the capacitor C104, the second terminal of the capacitor C104 and the second output terminal of the EMI filter circuit are grounded, and the connection terminal between the second terminal of the capacitor C103 and the first terminal of the capacitor C104 is connected to the control circuit;
the cathode of the diode D102 and the first end of the capacitor C101 are output ends of the rectifier circuit.
9. The dual flyback switching power supply of claim 1, wherein the dual flyback switching circuit comprises: the first switch tube and the second switch tube;
the first end of the first switching tube is connected with the first control end of the control circuit, the second end of the first switching tube is connected with the output end of the rectifying circuit, and the third end of the first switching tube is connected with the first input end of the voltage conversion circuit;
the first end of the second switch tube is connected with the second control end of the control circuit, the second end of the second switch tube is connected with the second input end of the voltage conversion circuit, and the third end of the second switch tube is grounded through a resistor R130.
10. The double-transistor flyback switching power supply of claim 9, wherein the first switching transistor and the second switching transistor are both MOS transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920675118.2U CN209930144U (en) | 2019-05-10 | 2019-05-10 | Double-tube flyback switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920675118.2U CN209930144U (en) | 2019-05-10 | 2019-05-10 | Double-tube flyback switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN209930144U true CN209930144U (en) | 2020-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920675118.2U Active CN209930144U (en) | 2019-05-10 | 2019-05-10 | Double-tube flyback switching power supply |
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|---|---|
| CN (1) | CN209930144U (en) |
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- 2019-05-10 CN CN201920675118.2U patent/CN209930144U/en active Active
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