CN221010007U - Variable-ratio circuit of single-stage PFC transformer - Google Patents
Variable-ratio circuit of single-stage PFC transformer Download PDFInfo
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- CN221010007U CN221010007U CN202322233080.2U CN202322233080U CN221010007U CN 221010007 U CN221010007 U CN 221010007U CN 202322233080 U CN202322233080 U CN 202322233080U CN 221010007 U CN221010007 U CN 221010007U
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- 238000004804 winding Methods 0.000 claims abstract description 25
- 230000009466 transformation Effects 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses a single-stage PFC transformer transformation ratio variable circuit which comprises an upper main switch tube Q1, a lower main switch tube Q2 and a controllable electronic switch S1, wherein a primary winding of a main transformer is equally divided into a primary winding A and a primary winding B in proportion, the upper main switch tube Q1 and the lower main switch tube Q2 are connected with the controllable electronic switch S1, and the controllable electronic switch S1 is connected with the primary winding A and the primary winding B of the main transformer T1. The utility model has the following beneficial effects: the primary windings of the main transformer are equally divided into 2 groups according to proportion, and the voltage change is regulated by regulating the electronic switch position of the increased controllable electronic switch S1, so that the regulating range of the circuit can be increased by 1 time, the regulation of the output voltage is greatly stabilized, and other performance indexes of other switching power supplies such as dynamic characteristics are improved.
Description
Technical Field
The embodiment of the invention relates to the field of electronic circuits, in particular to a single-stage PFC transformer variable ratio circuit.
Background
As shown in fig. 1, in the single-stage PFC of the prior art, the upper main switching tube Q1 and the lower main switching tube Q2 are directly connected to all primary windings (Pin 1 and Pin 6) of the main transformer T1, and in such a connection manner, the transformation ratio is fixed, and the power supply should be able to adapt to global voltage standards due to the tendency of realizing technical standard globalization, but because of the conventional connection manner, the variation range of the secondary output Vout is too large when the input Vin is in a full range (110-220), so that the control system needs to sacrifice other much performances to achieve the goal of stable output, which is particularly remarkable in the single-stage PFC circuit.
Disclosure of utility model
Aiming at the situation, in order to overcome the defects of the prior art, the utility model provides a single-stage PFC transformer variable ratio circuit capable of improving output stability.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
The single-stage PFC transformer transformation ratio variable circuit comprises an upper main switching tube Q1, a lower main switching tube Q2 and a controllable electronic switch S1, wherein a primary winding of a main transformer is equally divided into a primary winding A and a primary winding B in proportion, the upper main switching tube Q1 and the lower main switching tube Q2 are connected with the controllable electronic switch S1, and the controllable electronic switch S1 is connected with the primary winding A and the primary winding B of the main transformer T1.
In the above technical solution, the controllable electronic switch S1 is a relay or a transistor.
Compared with the prior art, the utility model has the following beneficial effects: the primary windings of the main transformer are equally divided into 2 groups according to proportion, and the voltage change is regulated by regulating the electronic switch position of the increased controllable electronic switch S1, so that the regulating range of the circuit can be increased by 1 time, the regulation of the output voltage is greatly stabilized, and other performance indexes of other switching power supplies such as dynamic characteristics are improved.
Drawings
FIG. 1 is a schematic diagram of a prior art circuit structure of the present utility model;
Fig. 2 is a schematic circuit structure of the present utility model.
The upper main switching tubes Q1 and 2 of the 1 are connected with the controllable electronic switches S1 and 4 primary windings A and 5 primary windings B of the lower main switching tubes Q2 and 3.
Detailed Description
The utility model will be further illustrated by the following description and examples, which include but are not limited to the following examples.
As shown in fig. 2: the single-stage PFC transformer transformation ratio variable circuit comprises an upper main switching tube Q1, a lower main switching tube Q2 and a controllable electronic switch S1, wherein a primary winding of a main transformer is equally divided into a primary winding A and a primary winding B in proportion, the upper main switching tube Q1 and the lower main switching tube Q2 are connected with the controllable electronic switch S1, and the controllable electronic switch S1 is connected with the primary winding A and the primary winding B of the main transformer T1; the controllable electronic switch S1 is a relay or a transistor.
When the input voltage Vin is 220V, the control electronic switch is turned on to the a bit, and the circuit transformation ratio is N:1, when the input voltage Vin is 110V, the electronic switch is controlled to be turned on to B bit, and the circuit transformation ratio is 2N:1.
The above embodiment is only one of the preferred embodiments of the present utility model, and should not be used to limit the scope of the present utility model, but all the insubstantial modifications or color changes made in the main design concept and spirit of the present utility model are still consistent with the present utility model, and all the technical problems to be solved are included in the scope of the present utility model.
Claims (2)
1. A single-stage PFC transformer transformation ratio variable circuit is characterized in that: the primary winding of the main transformer is divided into a primary winding A and a primary winding B in proportion, the upper main switch tube Q1, the lower main switch tube Q2 are connected with the controllable electronic switch S1, and the controllable electronic switch S1 is connected with the primary winding A and the primary winding B of the main transformer T1.
2. A single-stage PFC transformer variable ratio circuit according to claim 1, wherein: the controllable electronic switch S1 is a relay or a transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322233080.2U CN221010007U (en) | 2023-08-18 | 2023-08-18 | Variable-ratio circuit of single-stage PFC transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322233080.2U CN221010007U (en) | 2023-08-18 | 2023-08-18 | Variable-ratio circuit of single-stage PFC transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221010007U true CN221010007U (en) | 2024-05-24 |
Family
ID=91092793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322233080.2U Active CN221010007U (en) | 2023-08-18 | 2023-08-18 | Variable-ratio circuit of single-stage PFC transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221010007U (en) |
-
2023
- 2023-08-18 CN CN202322233080.2U patent/CN221010007U/en active Active
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