CN206209446U - A kind of LED drive circuit based on negative temperature coefficient device - Google Patents
A kind of LED drive circuit based on negative temperature coefficient device Download PDFInfo
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- CN206209446U CN206209446U CN201620961992.9U CN201620961992U CN206209446U CN 206209446 U CN206209446 U CN 206209446U CN 201620961992 U CN201620961992 U CN 201620961992U CN 206209446 U CN206209446 U CN 206209446U
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- led
- resistor
- negative temperature
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Abstract
A kind of LED drive circuit based on negative temperature coefficient device, the utility model is related to field of LED drive technology, and solve prior art drive circuit is influenceed the technical problem such as huge by temperature change.The utility model mainly includes LED groups circuit, error amplifying circuit, source voltage control circuit, reference voltage source and closed loop connection circuit；The LED groups circuit includes LED lamp bead component and heat conducting bar, and the LED lamp bead component is arranged on the outer wall of heat conducting bar, and the one or both ends of the heat conducting bar are provided with heat transfer device.
Description
Technical field
The present invention relates to field of LED drive technology, and in particular to a kind of LED based on negative temperature coefficient device drives electricity
Road.
Background technology
Constant current driving is the sampled voltage by gathering LED, constitutes closed loop to adjust the size of supply voltage so that
By the electric current stabilization of LED.But, because LED has cut-in voltage in itself, when supply voltage just starts, it is insufficient to allow
LED conductings are obtained, thus the sampled voltage of LED is output as zero, causes LED drive circuit open loop.Thus supply voltage rapid increase
During be not under control, occur output overshoot phenomenon, LED is may result in when serious and is burnt.
In order to obtain the supply voltage of stabilization, the reference voltage of stabilization just must be first provided, from above-mentioned introduction,
Reference voltage value obtained by reference voltage circuit of the prior art can change with temperature change, and then lead to not carry
For the precisely supply voltage of stabilization.
Therefore, a patent of invention for Application No. 201010292713.1, discloses a kind of reference voltage circuit, the base
Quasi- potential circuit does not utilize other temperature correction circuit for being separated with reference voltage circuit etc., and by two E type NMOS crystal
The differential voltage of the threshold voltage of pipe 14~15 is added to generate reference voltage V ref with the threshold voltage of D type nmos pass transistors,
Thus, the deterioration reason of the temperature characterisitic of reference voltage V ref is that influence of the D types nmos pass transistor to reference voltage V ref diminishes,
Changes and bending of the reference voltage V ref relative to the slope of temperature can be suppressed.In the patent, while used exhausting metal-oxide-semiconductor
With enhancing metal-oxide-semiconductor, this can increase process complexity, and most of techniques do not provide both metal-oxide-semiconductors simultaneously.
The content of the invention
For above-mentioned prior art, electricity is driven present invention aim at a kind of LED based on negative temperature coefficient device is provided
Road, solve prior art drive circuit is influenceed the technical problem such as huge by temperature change.
To reach above-mentioned purpose, the technical solution adopted by the present invention is as follows：
A kind of LED drive circuit based on negative temperature coefficient device, including LED groups circuit, error amplifying circuit, power supply electricity
Voltage-controlled circuit processed, reference voltage source and closed loop connection circuit；
The output end of the source voltage control circuit connects the power end of the LED groups circuit；
The first voltage signal input part of the error amplifying circuit is connected with the signal acquisition terminal of the LED groups circuit；
The second voltage signal input part of the error amplifying circuit is connected with the reference voltage source；The letter of the error amplifying circuit
Number output end is connected with the input of the source voltage control circuit；
The closed loop connection circuit connects the output end and the error amplifying circuit of the source voltage control circuit
First voltage signal input part；
The reference voltage source, wherein start-up circuit, positive temperature coefficient reference circuit and bias voltage circuit, bias voltage
Circuit includes PMOS, the first pull down resistor and negative temperature device, and the negative temperature device is the metal-oxide-semiconductor with negative temperature coefficient,
The drain electrode of PMOS is grounded after being sequentially connected in series negative temperature device and the first pull down resistor；
The LED groups circuit includes LED lamp bead component and heat conducting bar, and the LED lamp bead component is arranged on the outer of heat conducting bar
On wall, the one or both ends of the heat conducting bar are provided with heat transfer device.
In such scheme, the closed loop connection circuit includes first resistor, second resistance and the first electric capacity；
The first end of the first resistor connects the output end of the source voltage control circuit；
The first end of the second resistance connects the second end of the first resistor, and the second resistance the second termination
Ground；
The first end of first electric capacity connects the second end of the first resistor, the second end connection of first electric capacity
The first voltage signal input part of the error amplifying circuit.
In such scheme, the LED groups circuit includes the N number of LED and the sampling resistor that are sequentially connected in series, N >=1；Wherein,
First power end of the just extremely described LED groups circuit of LED；The negative pole of n-th LED and the first of the sampling resistor
End connection, the second end ground connection of the sampling resistor；The first end of the sampling resistor is the signal acquisition of the LED groups circuit
End.
In such scheme, the error amplifying circuit includes operational amplifier, 3rd resistor, the second electric capacity and the 3rd electricity
Hold；The normal phase input end of the operational amplifier is the second voltage signal input part of the error amplifying circuit, the computing
The inverting input of amplifier is the first voltage signal input part of the error amplifying circuit, the output of the operational amplifier
It is the signal output part of the error amplifying circuit to hold；The first end of the 3rd resistor connects the output of the operational amplifier
End, the second end of the 3rd resistor connects the first end of second electric capacity；The second end connection of second electric capacity is described
The inverting input of operational amplifier；The first end of the 3rd electric capacity connects the output end of the operational amplifier, and described the
Second end of three electric capacity connects the inverting input of the operational amplifier.
In such scheme, the LED drive circuit also includes bleeder circuit；The reference voltage source is by partial pressure electricity
Road is connected to the second voltage signal input part of the error amplifying circuit.
In such scheme, the negative temperature device is realized that the source class of PMOS MP4 is connected to PMOS by PMOS MP4
The drain electrode of MP3, the grid of PMOS MP4 is connected with drain electrode, and is grounded after the first pull down resistor of connecting.
In such scheme, the positive temperature coefficient reference circuit include PMOS MP1, PMOS MP2, NMOS tube MN3,
NMOS tube MN4 and the second pull down resistor, bias voltage circuit include PMOS MP3, PMOS MP4 and the first pull down resistor；
The grid of PMOS MP1 is connected with the grid of PMOS MP2 and the source class of NMOS tube MN4, the source class of PMOS MP1, PMOS
The source class of pipe MP2 and the source class of PMOS MP3 are connected to VDD, the drain electrode of the drain electrode connection NMOS tube MN3 of PMOS MP1,
The grid of NMOS tube MN3 and the grid of NMOS tube MN4；The source class ground connection of NMOS tube MN3；The drain series of NMOS tube MN4
It is grounded after two pull down resistors；The source class of the drain electrode connection PMOS MP4 of PMOS MP3；The grid and drain electrode phase of PMOS MP4
Even, it is grounded after the first pull down resistor of series connection.
Compared with prior art, beneficial effects of the present invention：
It is easily integrated, and is easily installed in the lamppost of cylindrical type.
The device of positive temperature coefficient reference circuit and negative temperature coefficient, the reference voltage of generation is just made with temperature-compensating
With the influence that the final reference voltage for producing is varied with temperature is just smaller.It ensure that whole circuit is in height
Stability during temperature work, improves the overall performance of circuit.In addition, the present invention only needs to conventional device can design benchmark
Circuit, its process is simple, it is easier to the transplanting between different process.
Output end and the error amplifying circuit that circuit connects the source voltage control circuit are connected by closed loop
First voltage signal input part, in power initiation, constitutes a temporary transient closed loop so that electric power output voltage Vout can
Risen with stabilization, prevent output from overshooting.When electric power output voltage Vout is in stable state, first in closed loop connection circuit is drop-down
Resistance and the second pull down resistor partial pressure so that the first electric capacity C1 can bear voltage higher, for example can using pressure voltage compared with
Low patch capacitor, cost is lower, and take PCB surface product it is small, it is advantageous in layout.Simultaneously RB346 under stable situation,
RB365 is used as the fictitious load of output, it is not necessary to which again plus fictitious load, devices use rate is optimized.LED constant current can be realized
Control and prevent to produce voltage overshoot phenomenon during power initiation, protect LED, while ensureing that hardware cost is low.
Brief description of the drawings
Fig. 1 is module diagram of the invention；
Fig. 2 is the circuit theory schematic diagram of reference voltage source specific implementation of the invention.
Specific embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, can combine by any way.
The present invention will be further described below in conjunction with the accompanying drawings：
Embodiment 1
The bleeder circuit includes the 4th resistance, the 5th resistance and the 4th electric capacity；The first end of the 4th resistance connects
The reference voltage source is connect, the second end of the 4th resistance connects the first end of the 5th resistance；5th resistance
First end connects the second voltage signal input part of the error amplifying circuit, the second end ground connection of the 5th resistance；It is described
4th electric capacity and the 5th resistor coupled in parallel.
The LED drive circuit also includes RC filter circuits；The signal acquisition terminal of the LED groups circuit is filtered by the RC
Wave circuit is connected with the first voltage signal input part of the error amplifying circuit.
The RC filter circuits include the 6th resistance and the 5th electric capacity；The first end of the 6th resistance connects the LED
The signal acquisition terminal of group circuit, the second end of the 6th resistance connects the first end of the 5th electric capacity；5th electric capacity
The second end ground connection；Second end of the 6th resistance connects the first voltage signal input part of the error amplifying circuit.
The LED drive circuit also includes optical coupling isolation circuit；The signal output part of the error amplifying circuit passes through institute
Optical coupling isolation circuit is stated to be connected with the input of the source voltage control circuit.
The first resistor is single resistor or the resistance net being made up of in parallel or serial fashion multiple resistors
Network；The second resistance is single resistor or the resistor network being made up of in parallel or serial fashion multiple resistors.
The cross section of the heat conducting bar is circular or polygon.
The heat transfer device is provided with the cavity for housing Integrated circuit portion of the invention.
Present invention additionally comprises lampshade, the lampshade is connected with heat transfer device, also including radiator, the radiator and heat transfer device
Connection, also including lamp socket, the lamp socket is connected with heat transfer device.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Belong to those skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, all should
It is included within the scope of the present invention.
Claims (7)
1. a kind of LED drive circuit based on negative temperature coefficient device, it is characterised in that amplify electricity including LED groups circuit, error
Road, source voltage control circuit, reference voltage source and closed loop connection circuit；
The output end of the source voltage control circuit connects the power end of the LED groups circuit；
The first voltage signal input part of the error amplifying circuit is connected with the signal acquisition terminal of the LED groups circuit；It is described
The second voltage signal input part of error amplifying circuit is connected with the reference voltage source；The signal of the error amplifying circuit is defeated
Go out end to be connected with the input of the source voltage control circuit；
The closed loop connection circuit connects the output end and the first of the error amplifying circuit of the source voltage control circuit
Voltage signal inputs；
The reference voltage source, wherein start-up circuit, positive temperature coefficient reference circuit and bias voltage circuit, bias voltage circuit
Including PMOS, the first pull down resistor and negative temperature device, the negative temperature device is the metal-oxide-semiconductor with negative temperature coefficient, PMOS
The drain electrode of pipe is grounded after being sequentially connected in series negative temperature device and the first pull down resistor；
The LED groups circuit includes LED lamp bead component and heat conducting bar, and the LED lamp bead component is arranged on the outer wall of heat conducting bar,
The one or both ends of the heat conducting bar are provided with heat transfer device；
Also include lampshade, the lampshade is connected with heat transfer device, and also including radiator, the radiator is connected with heat transfer device, also wraps
Lamp socket is included, the lamp socket is connected with heat transfer device.
2. a kind of LED drive circuit based on negative temperature coefficient device as claimed in claim 1, it is characterised in that：
The closed loop connection circuit includes first resistor, second resistance and the first electric capacity；
The first end of the first resistor connects the output end of the source voltage control circuit；
The first end of the second resistance connects the second end of the first resistor, and the second end of the second resistance is grounded；
The first end of first electric capacity connects the second end of the first resistor, and the second end connection of first electric capacity is described
The first voltage signal input part of error amplifying circuit.
3. a kind of LED drive circuit based on negative temperature coefficient device as claimed in claim 1, it is characterised in that：The LED
Group circuit includes the N number of LED and the sampling resistor that are sequentially connected in series, N >=1；Wherein, first just extremely described LED of LED
The power end of group circuit；The negative pole of n-th LED is connected with the first end of the sampling resistor, and the second of the sampling resistor
End ground connection；The first end of the sampling resistor is the signal acquisition terminal of the LED groups circuit.
4. a kind of LED drive circuit based on negative temperature coefficient device as claimed in claim 1, it is characterised in that：The mistake
Difference amplifying circuit includes operational amplifier, 3rd resistor, the second electric capacity and the 3rd electric capacity；The positive of the operational amplifier is defeated
It is the second voltage signal input part of the error amplifying circuit to enter end, and the inverting input of the operational amplifier is the mistake
The first voltage signal input part of difference amplifying circuit, the output end of the operational amplifier is the signal of the error amplifying circuit
Output end；The first end of the 3rd resistor connects the output end of the operational amplifier, and the second end of the 3rd resistor connects
Connect the first end of second electric capacity；Second end of second electric capacity connects the inverting input of the operational amplifier；Institute
The first end for stating the 3rd electric capacity connects the output end of the operational amplifier, and the second end of the 3rd electric capacity connects the computing
The inverting input of amplifier.
5. a kind of LED drive circuit based on negative temperature coefficient device as claimed in claim 1, it is characterised in that：The LED
Drive circuit also includes bleeder circuit；The reference voltage source is connected to the error amplifying circuit by the bleeder circuit
Second voltage signal input part.
6. a kind of LED drive circuit based on negative temperature coefficient device as claimed in claim 5, it is characterised in that：It is described negative
Temperature device is realized that the source class of PMOS MP4 is connected to the drain electrode of PMOS MP3, the grid of PMOS MP4 by PMOS MP4
It is connected with drain electrode, and is grounded after the first pull down resistor of connecting.
7. a kind of LED drive circuit based on negative temperature coefficient device according to claim 6, it is characterised in that：It is described
Positive temperature coefficient reference circuit includes PMOS MP1, PMOS MP2, NMOS tube MN3, NMOS tube MN4 and the second pull down resistor,
Bias voltage circuit includes PMOS MP3, PMOS MP4 and the first pull down resistor；The grid of PMOS MP1 and PMOS MP2
Grid and the source class of NMOS tube MN4 be connected, the source class of PMOS MP1, the source class of PMOS MP2 and PMOS MP3's
Source class is connected to VDD, and the drain electrode of PMOS MP1 connects drain electrode, the grid of NMOS tube MN3 and the NMOS tube MN4 of NMOS tube MN3
Grid；The source class ground connection of NMOS tube MN3；It is grounded after the pull down resistor of drain series second of NMOS tube MN4；PMOS MP3's
The source class of drain electrode connection PMOS MP4；The grid of PMOS MP4 is connected with drain electrode, is grounded after the first pull down resistor of series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620961992.9U CN206209446U (en) | 2016-08-28 | 2016-08-28 | A kind of LED drive circuit based on negative temperature coefficient device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620961992.9U CN206209446U (en) | 2016-08-28 | 2016-08-28 | A kind of LED drive circuit based on negative temperature coefficient device |
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| Publication Number | Publication Date |
|---|---|
| CN206209446U true CN206209446U (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620961992.9U Expired - Fee Related CN206209446U (en) | 2016-08-28 | 2016-08-28 | A kind of LED drive circuit based on negative temperature coefficient device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665897A (en) * | 2020-06-19 | 2020-09-15 | 浙江驰拓科技有限公司 | Voltage stabilizing power supply circuit with negative temperature coefficient |
| CN112034922A (en) * | 2020-11-06 | 2020-12-04 | 成都铱通科技有限公司 | Positive temperature coefficient bias voltage generating circuit with accurate threshold |
-
2016
- 2016-08-28 CN CN201620961992.9U patent/CN206209446U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665897A (en) * | 2020-06-19 | 2020-09-15 | 浙江驰拓科技有限公司 | Voltage stabilizing power supply circuit with negative temperature coefficient |
| CN112034922A (en) * | 2020-11-06 | 2020-12-04 | 成都铱通科技有限公司 | Positive temperature coefficient bias voltage generating circuit with accurate threshold |
| CN112034922B (en) * | 2020-11-06 | 2021-01-15 | 成都铱通科技有限公司 | Positive temperature coefficient bias voltage generating circuit with accurate threshold |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170531 Termination date: 20200828 |
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| CF01 | Termination of patent right due to non-payment of annual fee |