CN206077769U - It is new to remove the linear LED drive circuit of stroboscopic - Google Patents
It is new to remove the linear LED drive circuit of stroboscopic Download PDFInfo
- Publication number
- CN206077769U CN206077769U CN201621078515.4U CN201621078515U CN206077769U CN 206077769 U CN206077769 U CN 206077769U CN 201621078515 U CN201621078515 U CN 201621078515U CN 206077769 U CN206077769 U CN 206077769U
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- China
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- drive circuit
- stroboscopic
- electric capacity
- new
- rectifier bridge
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Abstract
This utility model offer one kind is new to remove the linear LED drive circuit of stroboscopic, including rectifier bridge, LED load, the first drive circuit, the second drive circuit and electric capacity；Input ac voltage accesses the input of rectifier bridge and carries out rectification；Electric capacity one end is connected with an outfan of rectifier bridge, and the other end is connected with the first drive circuit respectively；The joint of rectifier bridge and electric capacity is connected with the second drive circuit；LED load one end is connected with the first drive circuit, and the other end is connected with the second drive circuit.Have an advantage in that the voltage at electric capacity two ends again can not be by the loaded pressure drop clamper of lamp bead, within the same time, capacitance charging current is bigger, and two sections of voltages of electric capacity are higher, electric capacity exoergic amount is bigger, therefore the effect that nothing/low frequency dodges can be realized in the case of same capacity.
Description
Technical field
This utility model is related to a kind of new remove the linear LED drive circuit of stroboscopic.
Background technology
In recent years, high-brightness LED illumination with specular removal, the long-life, high reliability and it is pollution-free the advantages of progressively take
For conventional light sources such as electric filament lamp, fluorescent lamps.Increasingly perfect with LED technology, the U.S. is in CEC-400-2015-038-
Clearly stroboscopic percentage ratio is claimed in CMF JA10, although only implement in California, USA at present, but well imagine not
The large area that is bound to long future is implemented.
Especially for the high PF schemes of conventional linear, during conventional linear light modulation drives, because input can not power up solution, therefore
The energy for needing output electrolysis storage enough, could realize that the nothing/low frequency of LED dodges.But because Linear Driving operating frequency all compares
It is relatively low, therefore very big electrolysis is needed, could realize that the nothing/low frequency for exporting dodges, when driver is limited by structural member space
When, output electrolysis can not be increased, therefore stroboscopic problem cannot be solved.
The common linear LED drive circuits of high PF, as shown in figure 1, drive circuit 1 is used for the output electricity for modulating LED load
Stream (Iout), due to the presence of feedback circuit, when input voltage (Vin) is higher than LED load pressure drop (VLed), drive circuit 1
Start working, then output current is remained
Only can just charge when input voltage instantaneous value is less than lamp bead voltage on wherein electric capacity C1, and during lamp bead conducting
Two sections of voltages of electric capacity are waited by lamp bead clamper in Vled, is not difficult to learn that the energy of electric capacity storage is very limited by E=1/2CU^2, therefore
When whole modulated structure is limited causes capacitance C be limited, electric capacity cannot provide enough energy, therefore nothing difficult to realize/low
Stroboscopic drives.
Utility model content
Problem to be solved in the utility model is that offer one kind is new removes the linear LED drive circuit of stroboscopic, with solution
Technical problem is stated, the defect of prior art is overcome.
This utility model provide it is a kind of it is new removes the linear LED drive circuit of stroboscopic, including, rectifier bridge, LED load, first
Drive circuit, the second drive circuit and electric capacity；Input ac voltage accesses the input of rectifier bridge and carries out rectification；Electric capacity one end with
One outfan of rectifier bridge is connected, and the other end is connected with the first drive circuit respectively；The joint and of rectifier bridge and electric capacity
Two drive circuits are connected；LED load one end is connected with the first drive circuit, and the other end is connected with the second drive circuit.
This utility model offer one kind is new to remove the linear LED drive circuit of stroboscopic, can also have the feature that：First
Drive circuit includes that the first power tube, the first operational amplifier and total current set resistance；The homophase of the first operational amplifier is defeated
Enter to terminate into reference voltage, inverting input is connected with the 3rd end of the first power tube, the first of outfan and the first power tube
End is connected；Second end of the first power tube is connected with one end of LED load, electric capacity respectively；Total current setting resistance one end with
The inverting input of the first operational amplifier is connected, other end ground connection.
This utility model offer one kind is new to remove the linear LED drive circuit of stroboscopic, can also have the feature that：First
Power tube is field effect transistor, and first end is grid, and to drain, the 3rd end is source electrode at the second end.
This utility model offer one kind is new to remove the linear LED drive circuit of stroboscopic, can also have the feature that：Second
Drive circuit includes that the second power tube, the second operational amplifier and LED current set resistance；The homophase of the second operational amplifier
Input accesses reference voltage, and inverting input is connected with the 3rd end of the second power tube, and the of outfan and the second power tube
One end is connected；Second end of the second power tube is connected with the joint of rectifier bridge and electric capacity；LED current setting resistance one end with
The inverting input of the second operational amplifier is connected, and the other end is connected with one end of load.
This utility model offer one kind is new to remove the linear LED drive circuit of stroboscopic, can also have the feature that：Second
Power tube is field effect transistor, and first end is grid, and to drain, the 3rd end is source electrode at the second end.
This utility model offer one kind is new to remove the linear LED drive circuit of stroboscopic, can also have the feature that：LED
The negative terminal of load is connected with the first drive circuit, and anode is connected with the second drive circuit.
This utility model offer one kind is new to remove the linear LED drive circuit of stroboscopic, can also have the feature that：Rectification
Another output head grounding of bridge.
This utility model offer one kind is new to remove the linear LED drive circuit of stroboscopic, can also have the feature that：Rectification
Bridge is made up of four diodes.
The effect of utility model and effect
This utility model provide it is a kind of new remove the linear LED drive circuit of stroboscopic, the voltage at electric capacity two ends again can not be by
The loaded pressure drop Vled clampers of LED lamp bead, on electric capacity, gross energy can be determined by charging interval, charging current, in the same time
Interior, capacitance charging current is bigger, and two sections of voltages of electric capacity are higher, and it is bigger that electric capacity puts ENERGY E, therefore in the case of same capacity
The effect that nothing/low frequency dodges can be realized.
Description of the drawings
Fig. 1 is traditional linear LED drive circuit figure.
Fig. 2 removes the linear LED drive circuit figure of stroboscopic for new.
Specific embodiment：
Below in conjunction with accompanying drawing, this utility model is described further.
Fig. 2 removes the linear LED drive circuit figure of stroboscopic for new.
As shown in Fig. 2 new go the linear LED drive circuit of stroboscopic to include：Rectifier bridge, LED load, the first drive circuit,
Second drive circuit and electric capacity C1.
Rectifier bridge is made up of four diodes D1, D2, D3 and D4.Input ac voltage ACin accesses the input of rectifier bridge
Carry out rectification.
First drive circuit includes：First field effect transistor M1, the first operational amplifier OTA1 and total current setting resistance
Rcs_1.Second drive circuit includes that the second field effect transistor M2, the second operational amplifier OTA2 and LED current set resistance Rcs_
2。
Electric capacity C1 one end is connected with an outfan of rectifier bridge, the first field effect transistor of the other end and the first drive circuit
The drain electrode of M1 is connected.
The in-phase input end of the first operational amplifier OTA1 accesses reference voltage V ref, inverting input and the first field effect
The source electrode of pipe OTA1 is connected, and outfan is connected with the grid of the first field effect transistor OTA1.Total current sets one end of resistance Rcs_1
It is connected with the inverting input of the first operational amplifier OTA1, other end ground connection.
The joint of rectifier bridge and electric capacity is connected with the second field effect transistor M2 drain electrode of the second drive circuit.
The in-phase input end of the second operational amplifier OTA2 accesses reference voltage V ref, inverting input and the second field effect
The source electrode of pipe M2 is connected, and outfan is connected with the grid of the second field effect transistor M2.LED current setting resistance Rcs_2 one end with
The inverting input of the second operational amplifier OTA2 is connected, and the other end is connected with the anode of load.
The negative terminal of LED load is connected with the drain electrode of the first field effect transistor M1 of the first drive circuit.
The new operation principle for removing the linear LED drive circuit of stroboscopic：
First drive circuit is used for total current Itotal of modulating capacitor charging current Ic and the second drive circuit due to anti-
Road presence is fed back to, therefore：
Wherein：The feedback loop voltage of the first drive circuits of Vcs_1-.
Second drive circuit is used for output current Iout for modulating LED load, and wherein output current is by the second driving current
Modulation, as feedback circuit is present, then output current Iout is：
Wherein：The current settings voltage of the second drive circuits of Vcs_2-.
Therefore the energy stored on electric capacity C1:
Wherein：
The energy stored on E- electric capacity；
C- capacitances；
Two sections of voltages of U- electric capacity；
Ic- capacitance charging currents；
T- capacitor charging times.
Therefore the quantity of electric charge is on electric capacity:
Q=CU=ICT------------------------------ formula (3)
Voltage U not can by the loaded pressure drop Vled clampers of LED lamp bead, therefore on electric capacity gross energy can by charging interval t, fill
Electric current Ic determines that within the same time, Ic is bigger, and two sections of voltage U are higher for electric capacity, and it is bigger that electric capacity puts ENERGY E, therefore equally
The effect that nothing/low frequency dodges can be realized in the case of capacity.
By formula (1), (2), (3) can know that electric capacity can be with Ic constant current charges：
Claims (8)
1. one kind is new removes the linear LED drive circuit of stroboscopic, it is characterised in that：
Including rectifier bridge, LED load, the first drive circuit, the second drive circuit and electric capacity；
Input ac voltage accesses the input of the rectifier bridge and carries out rectification；
Described electric capacity one end is connected with an outfan of the rectifier bridge, the other end respectively with the first drive circuit phase
Even；
The joint of the rectifier bridge and the electric capacity is connected with second drive circuit；
Described LED load one end is connected with first drive circuit, and the other end is connected with second drive circuit.
It is 2. according to claim 1 new to remove the linear LED drive circuit of stroboscopic, it is characterised in that：
Wherein, the first drive circuit includes that the first power tube, the first operational amplifier and total current set resistance；
The in-phase input end of first operational amplifier accesses reference voltage, and the of inverting input and first power tube
Three ends are connected, and outfan is connected with the first end of first power tube；
Second end of first power tube is connected with one end of the LED load, the electric capacity respectively；
One end of the total current setting resistance is connected with the inverting input of first operational amplifier, other end ground connection.
It is 3. according to claim 2 new to remove the linear LED drive circuit of stroboscopic, it is characterised in that：First power tube
For field effect transistor, first end is grid, and to drain, the 3rd end is source electrode at the second end.
It is 4. according to claim 1 new to remove the linear LED drive circuit of stroboscopic, it is characterised in that：
Wherein, the second drive circuit includes that the second power tube, the second operational amplifier and LED current set resistance；
The in-phase input end of second operational amplifier accesses reference voltage, and the of inverting input and second power tube
Three ends are connected, and outfan is connected with the first end of second power tube；
Second end of second power tube is connected with the joint of the rectifier bridge and the electric capacity；
One end of LED current setting resistance is connected with the inverting input of second operational amplifier, the other end and institute
The one end for stating load is connected.
It is 5. according to claim 4 new to remove the linear LED drive circuit of stroboscopic, it is characterised in that：Second power tube
For field effect transistor, first end is grid, and to drain, the 3rd end is source electrode at the second end.
It is 6. according to claim 1 new to remove the linear LED drive circuit of stroboscopic, it is characterised in that：Wherein, the LED bears
The negative terminal of load is connected with first drive circuit, and anode is connected with second drive circuit.
It is 7. according to claim 1 new to remove the linear LED drive circuit of stroboscopic, it is characterised in that：Wherein, the rectifier bridge
Another output head grounding.
It is 8. according to claim 1 new to remove the linear LED drive circuit of stroboscopic, it is characterised in that：Wherein, the rectifier bridge
It is made up of four diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621078515.4U CN206077769U (en) | 2016-09-23 | 2016-09-23 | It is new to remove the linear LED drive circuit of stroboscopic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621078515.4U CN206077769U (en) | 2016-09-23 | 2016-09-23 | It is new to remove the linear LED drive circuit of stroboscopic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206077769U true CN206077769U (en) | 2017-04-05 |
Family
ID=58440434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621078515.4U Expired - Fee Related CN206077769U (en) | 2016-09-23 | 2016-09-23 | It is new to remove the linear LED drive circuit of stroboscopic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206077769U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106954296A (en) * | 2016-09-23 | 2017-07-14 | 上海占空比电子科技有限公司 | Remove the linear LED drive circuit of stroboscopic |
-
2016
- 2016-09-23 CN CN201621078515.4U patent/CN206077769U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106954296A (en) * | 2016-09-23 | 2017-07-14 | 上海占空比电子科技有限公司 | Remove the linear LED drive circuit of stroboscopic |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170405 Termination date: 20190923 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |