CN219938214U - Low-voltage multi-level auxiliary power supply - Google Patents
Low-voltage multi-level auxiliary power supply Download PDFInfo
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- CN219938214U CN219938214U CN202321540114.6U CN202321540114U CN219938214U CN 219938214 U CN219938214 U CN 219938214U CN 202321540114 U CN202321540114 U CN 202321540114U CN 219938214 U CN219938214 U CN 219938214U
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- diode
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- flyback transformer
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- 239000003990 capacitor Substances 0.000 abstract description 16
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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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 belongs to the technical field of auxiliary power supplies, and discloses a low-voltage multi-level auxiliary power supply, wherein the positive electrode of the power supply is connected with a third resistor and a first wiring terminal of the primary side of a flyback transformer, the third resistor R3 is respectively connected with a UV pin and a fourth resistor of a power supply management chip, the fourth resistor is grounded, a second wiring terminal of the primary side is connected with a VDRAN pin, the first wiring terminal of the secondary side is respectively connected with the positive electrode of a first diode and the positive electrode of a second diode, the negative electrode of the first diode is connected with a VCC pin, the negative electrode of the second diode is loaded, the second wiring terminal of the secondary side is connected with a load through a third diode, the fourth wiring terminal is connected with a load through a fourth diode, the fifth wiring terminal is connected with a load through a fifth diode, the third wiring terminal and the sixth wiring terminal are grounded, the power supply management chip GND and the OV pin are grounded, the CT pin is connected with a first capacitor, the VFB pin is connected with the first resistor and the second resistor, the first resistor is connected with a second capacitor, the second capacitor is connected with the second capacitor, and the second capacitor is connected with the negative electrode of the third diode. And the flyback transformer and the power management chip are used for realizing wide-voltage input and stable multi-path output of the main circuit.
Description
Technical Field
The utility model relates to the technical field of auxiliary power supplies, in particular to a low-voltage multi-level auxiliary power supply.
Background
The auxiliary power supply is used for providing a stable and reliable low-voltage power supply for a control circuit, a driving circuit, a sampling circuit, a communication circuit and the like of the system, so that the stable and reliable work of the control circuit, the driving circuit, the sampling circuit, the communication circuit and the like is ensured.
In the prior art, an auxiliary power supply of the photovoltaic grid-connected inverter consists of an alternating current auxiliary power supply and a direct current auxiliary power supply, and the output side is subjected to parallel backup power supply. However, the inverter needs to transform the auxiliary power supply through a transformer to output through the output end. The transformer ratio of the conventional transformer is determined by the ratio of the turns of the primary coil and the secondary coil, and in order to conveniently adjust the transformer ratio, a sliding transformer is mostly used. The sliding transformer adjusts the coil number of turns of an access circuit through sliding between the sliding vane and the coil, the sliding vane is required to constantly slide on the coil in the voltage regulating mode, an insulating layer on the coil is easy to damage, mutual connection between the coils is caused, and voltage regulating multiples are difficult to accurately guarantee.
Disclosure of Invention
In order to solve the problems, the utility model provides a low-voltage multi-level auxiliary power supply.
The technical aim of the utility model is realized by the following technical scheme: the low-voltage multi-level auxiliary power supply comprises a power management chip and a flyback transformer T, wherein the positive pole PV+ of the photovoltaic power supply is connected with one end of a filter circuit, one end of a third resistor R3 and the first wiring end of the primary side of the flyback transformer T, the other end of the filter circuit is grounded, the other end of the third resistor R3 is respectively connected with a UV pin of the power management chip and a fourth resistor R4, the other end of the fourth resistor R4 is grounded, the second wiring end of the primary side of the flyback transformer T is connected with a VDRAN pin of the power management chip, the first wiring end of the secondary side of the flyback transformer T is respectively connected with the positive pole of a first diode D1 and the positive pole of a second diode D2, the negative pole of the first diode D1 is connected with the VCC pin of the power management chip, the negative pole of the second diode D2 is connected with the first load circuit, the second wiring end of the secondary side of the flyback transformer T is connected with the positive pole of a third diode D3, the negative pole of the third diode D3 is connected with the negative pole of the fourth diode D4, the positive pole of the fourth diode D4 is connected with the third load circuit, the fifth wiring of the secondary side of the flyback transformer T is connected with the positive pole of the fifth diode D5, the negative pole of the fifth diode D5 is connected with the fourth load circuit, the third wiring of the secondary side of the flyback transformer T and the sixth wiring of the secondary side are grounded, the GND pin and the OV pin of the power management chip are grounded, the CT pin of the power management chip is connected with one end of the first capacitor C1, the other end of the first capacitor C1 is grounded, the VFB pin of the power management chip is connected with one end of the first resistor R1 and one end of the second resistor R2 respectively, the other end of the second resistor R1 is connected with one end of the second capacitor C2, the other end of the second capacitor C2 is connected with the COMP pin of the power management chip, and the other end of the second resistor R2 is connected with the negative pole of the third diode D3.
Through adopting above-mentioned technical scheme, set up a plurality of wiring ends at flyback transformer T secondary, access power management chip again, flyback transformer T secondary second wiring end connects power management chip COMP pin through second resistance R2, can feed back flyback transformer T secondary second wiring end output voltage to power management chip, power management chip adjusts pulse signal's duty cycle according to output voltage's fluctuation, make each output voltage stable, just so can realize main way wide voltage input, multichannel stable output, simultaneously for a plurality of load circuits stable power supply.
Further, the positive pole PV+ of the photovoltaic power supply is connected with one end of the filter circuit, and the other end of the filter circuit is connected with the third resistor R3 and the first wiring end of the primary side of the flyback transformer T.
By adopting the technical scheme, the input end of the flyback transformer T is connected with the filter circuit, and unnecessary electric energy clutter in electric energy can be filtered through the filter circuit.
Furthermore, a power tube is integrated in the power management chip.
By adopting the technical scheme, the power tube is integrated in the power management chip, so that the on-off state of the flyback transformer can be conveniently controlled.
In summary, the utility model has the following beneficial effects: according to the utility model, the secondary side of the flyback transformer T is provided with a plurality of wiring terminals, and then is connected with the power management chip, the second wiring terminal of the secondary side of the flyback transformer T is connected with the COMP pin of the power management chip through the second resistor R2, so that the output voltage of the second wiring terminal of the secondary side of the flyback transformer T can be fed back to the power management chip, the power management chip adjusts the duty ratio of a pulse signal according to the fluctuation of the output voltage, and the output voltage of each output end is stable, thus the wide-voltage input and multipath stable output of a main circuit can be realized, and meanwhile, the stable power supply of a plurality of load circuits can be realized.
Drawings
Fig. 1 is a schematic diagram of an overall circuit structure according to an embodiment of the present utility model.
In the figure: 1. a primary first terminal; 2. a primary second terminal; 3. a secondary side first terminal; 4. a secondary second terminal; 5. a secondary third terminal; 6. a second terminal; 7. a sixth terminal of the secondary side; 8. and a fifth terminal on the secondary side.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model; it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments, and that all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments in the present utility model are within the protection scope of the present utility model.
As shown in fig. 1, an embodiment of the present utility model discloses a low-voltage multi-level auxiliary power supply, including. The power management chip is provided with 8 pins including a GND pin, a CT pin, a VFB pin, a COMP pin, an OV pin, a UV pin, a VCC pin and a VDRAN pin, and a power tube is integrally arranged in the power management chip so as to control the switching state of the flyback transformer T. The flyback transformer T is provided with a primary side and a secondary side, the primary side of the flyback transformer T is provided with a primary side first terminal 1 and a primary side second terminal 2, and the secondary side of the flyback transformer T is provided with a secondary side first terminal 3, a secondary side second terminal 4, a secondary side third terminal 5, a secondary side fourth terminal 6, a secondary side fifth terminal 8 and a secondary side sixth terminal 7.
When the photovoltaic power generation device is specifically arranged, the positive pole PV+ of the photovoltaic power supply is connected with one end of the filter circuit, the negative pole PV of the photovoltaic power supply is grounded, and the filter circuit is used for filtering unnecessary electric energy clutter in electric energy. The other end of the filter circuit is respectively connected with a third resistor R3 and a first wiring end 1 of the primary side of the flyback transformer T, the other end of the third resistor R3 is respectively connected with a UV pin of the power management chip and a fourth resistor R4, the other end of the fourth resistor R4 is grounded, and the third resistor R3 and the fourth resistor R4 form a voltage division feedback circuit. The second terminal 2 of the primary side of the flyback transformer T is connected with a VDRAN pin of a power management chip, the first terminal 3 of the secondary side of the flyback transformer T is respectively connected with the positive electrode of a first diode D1 and the positive electrode of a second diode D2, the negative electrode of the first diode D1 is connected with a VCC pin of the power management chip, the negative electrode of the second diode D2 is connected with a first load circuit, the second terminal 4 of the secondary side of the flyback transformer T is connected with the positive electrode of a third diode D3, the negative electrode of the third diode D3 is connected with a second load circuit, the fourth terminal 6 of the secondary side of the flyback transformer T is connected with the negative electrode of a fourth diode D4, the positive electrode of the fourth diode D4 is connected with a fifth diode D5, the negative electrode of the fifth diode D5 is connected with a fourth load circuit, the negative electrode of the secondary side of the flyback transformer T is connected with the third terminal 5 and the sixth terminal 7 of the secondary side of the flyback transformer T is grounded, the GND pin of the power management chip and the OV pin are grounded, the pin of the power management chip is connected with the first capacitor C1, the other end of the first capacitor C1 is connected with the other end of the capacitor C2, the other end of the capacitor C2 is connected with the other end of the capacitor C2, and the other end of the capacitor C2 is connected with the capacitor C2.
In the circuit, the first terminal 3 of the secondary side of the flyback transformer T, the second terminal 4 of the secondary side of the flyback transformer T, the fourth terminal 6 of the secondary side of the flyback transformer T and the fifth terminal 8 of the secondary side of the flyback transformer T are respectively connected with the first load circuit, the second load circuit, the third load circuit and the fourth load circuit through the second diode D2, the third diode D3, the fourth diode D4 and the fifth diode D5, wherein the direction of the fourth diode D4 is opposite to that of other paths, so that the output voltage of the fourth terminal 6 of the secondary side of the flyback transformer T is negative, and the output voltages of the first terminal 3 of the secondary side, the second terminal 4 of the secondary side, the fourth terminal 6 of the secondary side and the fifth terminal 8 of the secondary side are 13V, 5V, -13V and 13V respectively through the arrangement of the turns ratio of the coil of the secondary side of the flyback transformer T. The flyback transformer T secondary side second wiring terminal 4, the third diode D3, the second resistor R2 and the power management chip VFB pin form a feedback circuit, the output voltage of the secondary side second wiring terminal 4 is fed back to the power management chip, the power management chip adjusts the duty ratio of the pulse signal according to the fluctuation of the output voltage of the second wiring terminal 4, so that the output voltage is stable, and thus, the main circuit wide-voltage input and multi-path stable output can be realized, and meanwhile, the power is stably supplied to a plurality of load circuits. The duty ratio of the pulse signals can be adjusted through the power management chip to adjust the voltage of each output end, so that the voltage of each output end is changed to adapt to different load demands.
The above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (3)
1. A low-voltage multi-level auxiliary power supply is characterized in that: comprises a power management chip and a flyback transformer T, wherein the positive pole PV+ of a photovoltaic power supply is connected with one end of a third resistor R3, the other end of the third resistor R3 is respectively connected with a UV pin of the power management chip and a fourth resistor R4, the other end of the fourth resistor R4 is grounded, a second terminal (2) of the primary side of the flyback transformer T is connected with a VDRAN pin of the power management chip, a first terminal (3) of the secondary side of the flyback transformer T is respectively connected with the positive pole of a first diode D1 and the positive pole of a second diode D2, the negative pole of the first diode D1 is connected with a VCC pin of the power management chip, the negative pole of the second diode D2 is connected with a first load circuit, the second terminal (4) of the secondary side of the flyback transformer T is connected with the positive pole of the third diode D3, the negative pole of the third diode D3 is connected with a second load circuit, the fourth wiring end (6) of the secondary side of the flyback transformer T is connected with the negative electrode of the fourth diode D4, the positive electrode of the fourth diode D4 is connected with the third load circuit, the fifth wiring end (8) of the secondary side of the flyback transformer T is connected with the positive electrode of the fifth diode D5, the negative electrode of the fifth diode D5 is connected with the fourth load circuit, the third wiring end (5) of the secondary side of the flyback transformer T and the sixth wiring end (7) of the secondary side are grounded, the GND pin and the OV pin of the power management chip are grounded, the CT pin of the power management chip is connected with one end of the first resistor C1, the other end of the first resistor C1 is grounded, the VFB pin of the power management chip is connected with one end of the first resistor R1 and one end of the second resistor R2 respectively, the other end of the second resistor C2 is connected with the COMP pin of the power management chip, and the other end of the second resistor R2 is connected with the negative electrode of the third diode D3.
2. The low voltage multi-level auxiliary power supply of claim 1, wherein: the positive pole PV+ of the photovoltaic power supply is connected with one end of the filter circuit, and the other end of the filter circuit is connected with the third resistor R3 and the primary side first wiring terminal (1) of the flyback transformer T.
3. The low voltage multi-level auxiliary power supply of claim 1, wherein: and a power tube is integrated in the power management chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321540114.6U CN219938214U (en) | 2023-06-16 | 2023-06-16 | Low-voltage multi-level auxiliary power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321540114.6U CN219938214U (en) | 2023-06-16 | 2023-06-16 | Low-voltage multi-level auxiliary power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219938214U true CN219938214U (en) | 2023-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321540114.6U Active CN219938214U (en) | 2023-06-16 | 2023-06-16 | Low-voltage multi-level auxiliary power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219938214U (en) |
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2023
- 2023-06-16 CN CN202321540114.6U patent/CN219938214U/en active Active
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