CN201113814Y - Synchronous rectification circuit possess voltage-stabilizing function - Google Patents
Synchronous rectification circuit possess voltage-stabilizing function Download PDFInfo
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- CN201113814Y CN201113814Y CNU2007201255910U CN200720125591U CN201113814Y CN 201113814 Y CN201113814 Y CN 201113814Y CN U2007201255910 U CNU2007201255910 U CN U2007201255910U CN 200720125591 U CN200720125591 U CN 200720125591U CN 201113814 Y CN201113814 Y CN 201113814Y
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Abstract
The utility model provides a synchronistical rectifying circuit with the function of stabilizing the voltage, comprising a transformator, a switch and a control circuit, wherein, the transformator has a primary coil and a secondary coil, the primary coil can be applied by a voltage; the switch is a three-terminal element, the first terminal is coupled to a voltage output terminal, the third terminal is coupled to one end of the secondary coil; an input terminal of the control circuit is coupled to the voltage output terminal, an output terminal of the control circuit is coupled to the second terminal of the switch in order to ensure that the control circuit can control the conducting extent according to the voltage output terminal to keep the voltage output terminal stable.
Description
Technical field
The utility model relates to a kind of circuit of synchronous rectification, refers to a kind of circuit of synchronous rectification of tool voltage stabilizing function especially, and its control circuit can be controlled the conducting degree of this switch according to this voltage output end, so that this voltage output end is kept is stable.
Background technology
Press, synchronous rectification element in the general power supply unit only has the character of switch usually, that is this synchronous rectification element is to operate in complete conducting district, only has conducting or by two states, therefore can't reach the function of adjusting or stablizing its voltage output end, really belong to a fly in the ointment.
In view of this, the utility model proposes a kind of circuit of synchronous rectification of tool voltage stabilizing function to improve above-mentioned shortcoming.
The utility model content
A purpose of the present utility model provides a kind of circuit of synchronous rectification of tool voltage stabilizing function, and its control circuit can be controlled the conducting degree of this switch according to this voltage output end, so that this voltage output end is kept is stable.
In order to achieve the above object, the circuit of synchronous rectification of a kind of tool voltage stabilizing function of the present utility model is characterized in that, it has:
One transformer, but it has primary coil and a level coil of an applied voltage;
One switch is a three-terminal element, and its first end is coupled to a voltage output end, and the 3rd end is coupled to an end of this secondary coil; And
One control circuit, its input is coupled to this voltage output end, and output then is coupled to second end of this switch.
Wherein this switch is a power switch, and this power switch is that n channel metal oxide semiconductor field-effect transistor, N passage connect surface field-effect transistor, p channel metal oxide semiconductor field-effect transistor or P passage and connect surface field-effect transistor.
Wherein this first end is that this metal oxide semiconductor field effect is answered transistor drain, and this second end is that this metal oxide semiconductor field effect is answered transistorized grid, and the 3rd end is that this metal oxide semiconductor field effect should transistorized source electrode.
Wherein this control circuit is an integrated circuit or the control circuit be made up of some actives or passive device.
In order to achieve the above object, the circuit of synchronous rectification of a kind of tool voltage stabilizing function of the present utility model is characterized in that, it has:
One transformer, but it has primary coil and one first secondary coil and a second subprime coil of an input applied voltage;
One first switch is a three-terminal element, and its first end is coupled to an end of this first secondary coil, and the other end of this first secondary coil then is coupled to a voltage output end, and the 3rd end is ground connection then;
One second switch is a three-terminal element, and its first end is coupled to an end of this second subprime coil, and the other end of this second subprime coil then is coupled to this voltage output end, and the 3rd end is ground connection then; And
One control circuit, its input is coupled to this voltage output end, and output then is coupled to second end of this first switch and second switch.
Wherein this first switch and second switch are a power switch, and this power switch is that n channel metal oxide semiconductor field-effect transistor, N passage connect surface field-effect transistor, p channel metal oxide semiconductor field-effect transistor or P passage and connect surface field-effect transistor.
Wherein this first end is that this metal oxide semiconductor field effect is answered transistor drain, and this second end is that this metal oxide semiconductor field effect is answered transistorized grid, and the 3rd end is that this metal oxide semiconductor field effect should transistorized source electrode.
Wherein this control circuit is an integrated circuit or the control circuit be made up of some actives or passive device.
The beneficial effects of the utility model are:
The circuit of synchronous rectification of tool voltage stabilizing function of the present utility model, its control circuit can be controlled the conducting degree of this switch according to this voltage output end, so that this voltage output end is kept is stable.
Description of drawings
" circuit of synchronous rectification of tool voltage stabilizing function " of the present utility model, feature and purpose with accompanying drawing and example in detail as after, wherein:
Fig. 1 is a schematic diagram, and it illustrates the block schematic diagram of circuit of synchronous rectification of the tool voltage stabilizing function of this case one preferred embodiment.
Fig. 2 is a schematic diagram, and it illustrates the block schematic diagram of circuit of synchronous rectification of the tool voltage stabilizing function of another preferred embodiment of this case.
Fig. 3 is a schematic diagram, and it illustrates the block schematic diagram of circuit of synchronous rectification of the tool voltage stabilizing function of the another preferred embodiment of this case.
Embodiment
Please refer to Fig. 1, it illustrates the block schematic diagram of circuit of synchronous rectification of the tool voltage stabilizing function of this case one preferred embodiment.As shown in the figure, the circuit of synchronous rectification of tool voltage stabilizing function of the present utility model, it comprises: a transformer 10; One switch 20; And one control circuit 30 combine.
Wherein, it has a primary coil 11 and a level coil 12 this transformer 10, and the input of this primary coil 11 is coupled to a positive voltage input (V+) and a negative voltage input (V-) respectively, and this is general known technology, so do not intend repeating to give unnecessary details at this.
This switch 20 is to be a three-terminal element, and its first end is coupled to a voltage output end (Vo), and the 3rd end is coupled to an end of this secondary coil 12, and its conducting degree can be accepted the control of this control circuit 30.Wherein, this switch 20 can be a power switch, be for example and without limitation to the n channel metal oxide semiconductor field-effect transistor, the N passage connects surface field-effect transistor, p channel metal oxide semiconductor field-effect transistor or P passage and connects surface field-effect transistor, answer transistor 20 to call metal oxide semiconductor field effect in the following text, be to be that example is illustrated in the present embodiment with the n channel metal oxide semiconductor field-effect transistor, but not as limit; Wherein this first end is the drain electrode (drain) that this metal oxide semiconductor field effect is answered transistor 20, this second end is the grid (gate) that this metal oxide semiconductor field effect is answered transistor 20, and the 3rd end is the source electrode (source) that this metal oxide semiconductor field effect is answered transistor 20.
The input of this control circuit 30 is coupled to this voltage output end (Vo), and output then is coupled to second end of this switch 20.Wherein, this control circuit 30 control circuit of being for example and without limitation to an integrated circuit or forming by some actives or passive device.
So that when operation, when the voltage output of this voltage output end (Vo) reduced, this control circuit 30 can make these switch 20 conductings some more, to reduce the pressure drop on this switch 20, the voltage output of voltage output end was gone up; Export when too high when the voltage of this voltage output end, this control circuit 30 can make these switch 20 conductings less, to increase the pressure drop on this switch, the voltage output of voltage output end is reduced, so that this voltage output end is kept is stable.So, by the circuit of synchronous rectification of tool voltage stabilizing function of the present utility model, its switch 20 also can be kept the stable of this voltage output end except that the function of tool synchronous rectification, therefore, really can improve the shortcoming of synchronous rectification element in the known power source supply.
Please refer to Fig. 2, it illustrates the block schematic diagram of circuit of synchronous rectification of the tool voltage stabilizing function of another preferred embodiment of this case.As shown in the figure, the circuit of synchronous rectification of tool voltage stabilizing function of the present utility model, its switch 20 can be placed on the place, below of this secondary coil 12, also can reach function as shown in Figure 1.
Please refer to Fig. 3, it illustrates the block schematic diagram of circuit of synchronous rectification of the tool voltage stabilizing function of the another preferred embodiment of this case.As shown in the figure, the circuit of synchronous rectification of tool voltage stabilizing function of the present utility model, it comprises: a transformer 40; One first switch 50; One second switch 60; And one control circuit 70 combine.
Wherein, it has a primary coil 41 and one first secondary coil 42 and a second subprime coil 43 this transformer 40, the input of this primary coil 41 is coupled to a positive voltage input (V+) and a negative voltage input (V-) respectively, and this is general known technology, so do not intend repeating to give unnecessary details at this.
This first switch 50 is to be a three-terminal element, its first end is coupled to an end of this first secondary coil 42, the other end of this first secondary coil 42 then is coupled to a voltage output end (Vo), and the 3rd end is ground connection then, and its conducting degree can be accepted the control of this control circuit 70.Wherein, this first switch 50 can be a power switch, be for example and without limitation to n channel metal oxide semiconductor field-effect transistor, N passage and meet surface field-effect transistor, p channel metal oxide semiconductor field-effect transistor or the P passage person that connects the surface field-effect transistor, answer transistor 50 to call first metal oxide semiconductor field effect in the following text, be to be that example is illustrated in the present embodiment with the n channel metal oxide semiconductor field-effect transistor, but not as limit; Wherein this first end is the drain electrode (drain) that this first metal oxide semiconductor field effect is answered transistor 50, this second end is the grid (gate) that this first metal oxide semiconductor field effect is answered transistor 50, and the 3rd end is the source electrode (source) that this first metal oxide semiconductor field effect is answered transistor 50.
This second switch 60 also is a three-terminal element, its first end is coupled to an end of this second subprime coil 43, the other end of this second subprime coil 43 then is coupled to this voltage output end (Vo), and the 3rd end is ground connection then, and its conducting degree also can be accepted the control of this control circuit 70.Wherein, this second switch 60 can be a power switch, be for example and without limitation to n channel metal oxide semiconductor field-effect transistor, N passage and meet surface field-effect transistor, p channel metal oxide semiconductor field-effect transistor or the P passage person that connects the surface field-effect transistor, answer transistor 60 to call second metal oxide semiconductor field effect in the following text, be to be that example is illustrated in the present embodiment with the n channel metal oxide semiconductor field-effect transistor, but not as limit; Wherein this first end is the drain electrode (drain) that this second metal oxide semiconductor field effect is answered transistor 60, this second end is the grid (gate) that this second metal oxide semiconductor field effect is answered transistor 60, and the 3rd end is the source electrode (source) that this second metal oxide semiconductor field effect is answered transistor 60.
The input of this control circuit 70 is coupled to this voltage output end (Vo), and output then is coupled to second end of this first switch 50 and second switch 60.Wherein, this control circuit 70 control circuit of being for example and without limitation to an integrated circuit or forming by some actives or passive device.
So that when operation, when the voltage output of this voltage output end (Vo) reduces, this control circuit 70 can make this first switch 50 and second switch 60 conductings some more, to reduce the pressure drop on this first switch 50 and the second switch 60, the voltage output of voltage output end is gone up; When the voltage of this voltage output end is exported when too high, this control circuit 70 can make this first switch 50 and second switch 60 conductings less, to increase the pressure drop on this first switch 50 and the second switch 60, the voltage output of voltage output end is reduced, so that this voltage output end is kept is stable.So, by the circuit of synchronous rectification of tool voltage stabilizing function of the present utility model, its first switch 50 and second switch 60 also can be kept the stable of this voltage output end except that the function of tool synchronous rectification, therefore, really can improve the shortcoming of synchronous rectification element in the known power source supply.
Be with, enforcement via the circuit of synchronous rectification of tool voltage stabilizing function of the present utility model, its switch is except that the function of tool synchronous rectification, its control circuit also can be controlled the conducting degree of this switch according to this voltage output end, so that this voltage output end is kept advantages such as stable, therefore, really can improve the shortcoming of synchronous rectification element in the known power source supply.
What this case disclosed is preferred embodiment, the change of every part or modification and come from the technological thought of this case and be have the knack of this technology the people was easy to know by inference, all do not take off the patent right category of this case.
Claims (8)
1. the circuit of synchronous rectification of a tool voltage stabilizing function is characterized in that, it has:
One transformer, but it has primary coil and a level coil of an applied voltage;
One switch is a three-terminal element, and its first end is coupled to a voltage output end, and the 3rd end is coupled to an end of this secondary coil; And
One control circuit, its input is coupled to this voltage output end, and output then is coupled to second end of this switch.
2. the circuit of synchronous rectification of tool voltage stabilizing function as claimed in claim 1, it is characterized in that, wherein this switch is a power switch, and this power switch is that n channel metal oxide semiconductor field-effect transistor, N passage connect surface field-effect transistor, p channel metal oxide semiconductor field-effect transistor or P passage and connect surface field-effect transistor.
3. the circuit of synchronous rectification of tool voltage stabilizing function as claimed in claim 2, it is characterized in that, wherein this first end is that this metal oxide semiconductor field effect is answered transistor drain, this second end is that this metal oxide semiconductor field effect is answered transistorized grid, and the 3rd end is that this metal oxide semiconductor field effect should transistorized source electrode.
4. the circuit of synchronous rectification of tool voltage stabilizing function as claimed in claim 1 is characterized in that, wherein this control circuit is an integrated circuit or the control circuit be made up of some actives or passive device.
5. the circuit of synchronous rectification of a tool voltage stabilizing function is characterized in that, it has:
One transformer, but it has primary coil and one first secondary coil and a second subprime coil of an input applied voltage;
One first switch is a three-terminal element, and its first end is coupled to an end of this first secondary coil, and the other end of this first secondary coil then is coupled to a voltage output end, and the 3rd end is ground connection then;
One second switch is a three-terminal element, and its first end is coupled to an end of this second subprime coil, and the other end of this second subprime coil then is coupled to this voltage output end, and the 3rd end is ground connection then; And
One control circuit, its input is coupled to this voltage output end, and output then is coupled to second end of this first switch and second switch.
6. the circuit of synchronous rectification of tool voltage stabilizing function as claimed in claim 5, it is characterized in that, wherein this first switch and second switch are a power switch, and this power switch is that n channel metal oxide semiconductor field-effect transistor, N passage connect surface field-effect transistor, p channel metal oxide semiconductor field-effect transistor or P passage and connect surface field-effect transistor.
7. the circuit of synchronous rectification of tool voltage stabilizing function as claimed in claim 6, it is characterized in that, wherein this first end is that this metal oxide semiconductor field effect is answered transistor drain, this second end is that this metal oxide semiconductor field effect is answered transistorized grid, and the 3rd end is that this metal oxide semiconductor field effect should transistorized source electrode.
8. the circuit of synchronous rectification of tool voltage stabilizing function as claimed in claim 7 is characterized in that, wherein this control circuit is an integrated circuit or the control circuit be made up of some actives or passive device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201255910U CN201113814Y (en) | 2007-09-21 | 2007-09-21 | Synchronous rectification circuit possess voltage-stabilizing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201255910U CN201113814Y (en) | 2007-09-21 | 2007-09-21 | Synchronous rectification circuit possess voltage-stabilizing function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201113814Y true CN201113814Y (en) | 2008-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201255910U Expired - Fee Related CN201113814Y (en) | 2007-09-21 | 2007-09-21 | Synchronous rectification circuit possess voltage-stabilizing function |
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| CN (1) | CN201113814Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594326A (en) * | 2012-01-16 | 2012-07-18 | 惠州三华工业有限公司 | Voltage stabilizing switching circuit for power supply |
| WO2020151221A1 (en) * | 2019-01-24 | 2020-07-30 | 青岛海信电器股份有限公司 | Synchronous rectification circuit and display device |
| US11075585B2 (en) | 2019-01-24 | 2021-07-27 | Hisense Visual Technology Co., Ltd. | Synchronous rectification circuit and display device |
-
2007
- 2007-09-21 CN CNU2007201255910U patent/CN201113814Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594326A (en) * | 2012-01-16 | 2012-07-18 | 惠州三华工业有限公司 | Voltage stabilizing switching circuit for power supply |
| WO2020151221A1 (en) * | 2019-01-24 | 2020-07-30 | 青岛海信电器股份有限公司 | Synchronous rectification circuit and display device |
| US11075585B2 (en) | 2019-01-24 | 2021-07-27 | Hisense Visual Technology Co., Ltd. | Synchronous rectification circuit and display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHICONY POWER TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: HIPRO ELECTRONICS CO.,LTD. Effective date: 20100504 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20100504 Address after: Taipei County of Taiwan Province Patentee after: Chicony Power Technology Co., Ltd. Address before: Taipei County of Taiwan Province Patentee before: Gaoxiao Electronic Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080910 Termination date: 20120921 |