CN107544604A - A kind of gauze compensation circuit under constant current mode - Google Patents
A kind of gauze compensation circuit under constant current mode Download PDFInfo
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- CN107544604A CN107544604A CN201710955976.8A CN201710955976A CN107544604A CN 107544604 A CN107544604 A CN 107544604A CN 201710955976 A CN201710955976 A CN 201710955976A CN 107544604 A CN107544604 A CN 107544604A
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- Prior art keywords
- pmos transistor
- npn triode
- constant current
- current mode
- gauze
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Abstract
The invention provides the gauze compensation circuit under a kind of constant current mode, belong to semiconductor integrated circuit technical field.Circuit includes：First PMOS transistor P1, the second PMOS transistor P2, the 3rd PMOS transistor P3, the first NPN triode Q1, the second NPN triode Q2, first resistor R1 and second resistance R2；Gauze compensation circuit under the constant current mode of the present invention, constant current mode is worked in when AC DC converters, and during input supply voltage difference, because the effect of system coil can cause the difference of feedback end FB voltages, so as to introduce different current direction output end CS, so that CS is provided with the change that different compensation electric currents is compensated constant current value caused by mains voltage variations, so as to ensure the constant of output current.
Description
Technical field
The invention belongs to semiconductor integrated circuit technical field, and in particular to the gauze compensation electricity under a kind of constant current mode
Road.
Background technology
The advantages that AC-DC converter is exactly that alternating current is changed into the equipment of direct current, and it is by feat of efficiency high, small volume
Increasingly favored by users.
In AC-DC switch power supply systems, constant pressure and constant current both mode of operations are frequently present of, when working in constant pressure mould
During formula, AC-DC output is a constant voltage.When working in constant current mode, AC-DC output is a constant electric current.
Traditional AC-DC converter, when working in constant current mode, output current can be with gauze voltage (input AC electricity
Pressure) rising and rise, although this ascensional range and little, this usually brings puzzlement to circuit designers.
The content of the invention
When being operated in constant current mode to solve existing AC-DC converter, output current can be with gauze voltage (input AC
Voltage) rising and the technical problem that rises, the invention provides the gauze compensation circuit under a kind of constant current mode.
A kind of gauze compensation circuit being used under constant current mode, including the first PMOS transistor P1, the second PMOS transistor
P2, the 3rd PMOS transistor P3, the first NPN triode Q1, the second NPN triode Q2, first resistor R1 and second resistance R2；The
One PMOS transistor P1 source electrode connects power supply, and grid and drain electrode connect, and with the second PMOS transistor P2 and the 3rd PMOS crystal
Pipe P3 grid and the colelctor electrode of the first NPN triode Q1 are connected；Second PMOS transistor P2 source electrode connects power supply, and drain electrode connects
Second NPN triode Q2 colelctor electrode and the base stage of base stage and the first NPN triode Q1；3rd PMOS transistor P3 source electrode
Power supply is connect, drain electrode meets output end CS；First resistor R1 mono- terminates input FB, another termination second resistance R2 one end and the
The emitter stage of one NPN triode Q1；Second resistance R2 other end ground connection；Second NPN triode Q2 grounded emitter.
Gauze compensation circuit under the constant current mode of the present invention, when the constant current mode that works in of AC-DC converter, and input
Supply voltage is not simultaneously as the effect of system coil can cause the difference of feedback end FB voltages, so as to introduce different electric currents
Output end CS is flowed to, so that CS, which is provided with different compensation electric currents, is compensated constant current value caused by mains voltage variations
Change, so as to ensure the constant of output current.
Brief description of the drawings
Fig. 1 is the gauze compensation circuit structural representation being used under constant current mode that embodiment of the present invention provides.
Embodiment
To make the object, technical solutions and advantages of the present invention of greater clarity, with reference to embodiment and join
According to accompanying drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright scope.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring this
The concept of invention.
As shown in figure 1, be a kind of gauze compensation circuit being used under constant current mode provided by the invention, including the first PMOS
Transistor P1, the second PMOS transistor P2, the 3rd PMOS transistor P3, the first NPN triode Q1, the second NPN triode Q2,
One resistance R1 and second resistance R2；First PMOS transistor P1 source electrode connects power supply, and grid and drain electrode connect, and with the 2nd PMOS
The colelctor electrode of transistor P2 and the 3rd PMOS transistor P3 grid and the first NPN triode Q1 is connected；2nd PMOS crystal
Pipe P2 source electrode connects power supply, and drain electrode connects the second NPN triode Q2 colelctor electrode and the base of base stage and the first NPN triode Q1
Pole；3rd PMOS transistor P3 source electrode connects power supply, and drain electrode meets output end CS；First resistor R1 mono- terminates input FB, another
Terminate second resistance R2 one end and the emitter stage of the first NPN triode Q1；Second resistance R2 other end ground connection；Second
NPN triode Q2 grounded emitter.
Gauze compensation circuit under the constant current mode of the present invention, when the constant current mode that works in of AC-DC converter, and input
Supply voltage is not simultaneously as the effect of system coil can cause the difference of feedback end FB voltages, so as to introduce different electric currents
Output end CS is flowed to, so that CS, which is provided with different compensation electric currents, is compensated constant current value caused by mains voltage variations
Change, so as to ensure the constant of output current.
It should be appreciated that the above-mentioned embodiment of the present invention is used only for exemplary illustration or explains the present invention's
Principle, without being construed as limiting the invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent substitution, improvement etc., should be included in the scope of the protection.In addition, appended claims purport of the present invention
Covering the whole changes fallen into scope and border or this scope and the equivalents on border and repairing
Change example.
Claims (1)
- A kind of 1. gauze compensation circuit under constant current mode, it is characterised in that including：First PMOS transistor P1, the 2nd PMOS Transistor P2, the 3rd PMOS transistor P3, the first NPN triode Q1, the second NPN triode Q2, the electricity of first resistor R1 and second Hinder R2；First PMOS transistor P1 source electrode connects power supply, and grid and drain electrode connect, and with the second PMOS transistor P2 and the 3rd PMOS transistor P3 grid and the colelctor electrode of the first NPN triode Q1 are connected；Second PMOS transistor P2 source electrode connects electricity Source, drain electrode connect the second NPN triode Q2 colelctor electrode and the base stage of base stage and the first NPN triode Q1；3rd PMOS crystal Pipe P3 source electrode connects power supply, and drain electrode meets output end CS；First resistor R1 mono- terminates input FB, another termination second resistance R2's One end and the emitter stage of the first NPN triode Q1；Second resistance R2 other end ground connection；Second NPN triode Q2 transmitting Pole is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710955976.8A CN107544604A (en) | 2017-10-15 | 2017-10-15 | A kind of gauze compensation circuit under constant current mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710955976.8A CN107544604A (en) | 2017-10-15 | 2017-10-15 | A kind of gauze compensation circuit under constant current mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107544604A true CN107544604A (en) | 2018-01-05 |
Family
ID=60967772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710955976.8A Pending CN107544604A (en) | 2017-10-15 | 2017-10-15 | A kind of gauze compensation circuit under constant current mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107544604A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746574A (en) * | 2014-01-07 | 2014-04-23 | 无锡芯朋微电子股份有限公司 | Line voltage compensation circuit |
| CN104065273A (en) * | 2014-07-09 | 2014-09-24 | 深圳市科创达微电子有限公司 | Line voltage compensation circuit for constant current LED driving |
| CN206004960U (en) * | 2016-09-22 | 2017-03-08 | 上海登芯微电子科技有限公司 | A kind of LED linear constant-current circuit with line voltage compensation function |
| CN107171580A (en) * | 2017-07-10 | 2017-09-15 | 长沙方星腾电子科技有限公司 | A kind of gauze compensation circuit for AC DC converters |
-
2017
- 2017-10-15 CN CN201710955976.8A patent/CN107544604A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746574A (en) * | 2014-01-07 | 2014-04-23 | 无锡芯朋微电子股份有限公司 | Line voltage compensation circuit |
| CN104065273A (en) * | 2014-07-09 | 2014-09-24 | 深圳市科创达微电子有限公司 | Line voltage compensation circuit for constant current LED driving |
| CN206004960U (en) * | 2016-09-22 | 2017-03-08 | 上海登芯微电子科技有限公司 | A kind of LED linear constant-current circuit with line voltage compensation function |
| CN107171580A (en) * | 2017-07-10 | 2017-09-15 | 长沙方星腾电子科技有限公司 | A kind of gauze compensation circuit for AC DC converters |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180105 |
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| WD01 | Invention patent application deemed withdrawn after publication |