CN205961501U - Electric current self -adaptation low -power consumption LED drive circuit - Google Patents
Electric current self -adaptation low -power consumption LED drive circuit Download PDFInfo
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- CN205961501U CN205961501U CN201620675840.2U CN201620675840U CN205961501U CN 205961501 U CN205961501 U CN 205961501U CN 201620675840 U CN201620675840 U CN 201620675840U CN 205961501 U CN205961501 U CN 205961501U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model discloses an electric current self -adaptation low -power consumption LED drive circuit, including band gap reference voltage source, band gap reference current source, low -power consumption constant current circuit and PWM control circuit, still include excess temperature electric current auto -adjusting circuit and overtemperature prote circuit, band gap reference voltage source's input inserts input voltage, and band gap reference voltage source's output inserts on the input in low -power consumption constant current circuit's input and band gap reference current source, the output in band gap reference current source links to each other with low -power consumption constant current circuit's input, and low -power consumption constant current circuit's output is connected with PWM control circuit's input. This electric current self -adaptation low -power consumption LED drive circuit adopts excess temperature electric current auto -adjusting circuit to replace excess temperature power -off protection circuit commonly used to realize that output current's automation is adjustable, adopt operational amplifier and current mirror to design low -power consumption constant current circuit, realize LED constant current drive and low -power consumption.
Description
Technical field
This utility model is related to LED drive circuit technical field, and specially a kind of current automatic adaptation low-power consumption LED drives electricity
Road.
Background technology
At present, generally existing middle low power type LED drive chip on market, and great power LED driving chip is seldom, system
One main cause of about high-power LED chip market popularization is the heat dissipation problem of LED drive chip.Current chip present situation is main
Show as：（1）When chip temperature exceedes overheat protector point, the overheat protector module in driving chip opens self-protection work(
Can, take system cut-off（Or electric current is reduced to rapidly zero）To protect chip Deng measure, to wait chip temperature to be cooled to overheat protector
Driving chip is restarted again, this measure is not suitable for high power CW lighting field after within point（General lighting field can not
Suddenly power-off）, and the overheat protector module in chip there is a certain amount of power dissipation in itself.（2）The driving electricity of LED chip
Stream ILEDTypically by Vsense/RsenseCome to set, according to the chip operation instruction of general company, VsenseGenerally take 0.25V with
On, when we need an ILEDDuring the electric current of=350mA, the R of selectionsetFor 0.714 Ω, a so little resistance, in reality
It is difficult to ensure that its precision in use environment, and when with ILEDIncrease, RsetBecome less, its precision is more difficult to protect
Card, therefore, LED drive current is difficult to remain constant.
Utility model content
The purpose of this utility model is to provide a kind of current automatic adaptation low-power consumption LED drive circuit, have current constant,
The performances such as low in energy consumption, excess temperature not power-off, high life, to solve the problems, such as to propose in above-mentioned background technology.
For achieving the above object, this utility model provides following technical scheme：
A kind of current automatic adaptation low-power consumption LED drive circuit, including bandgap voltage reference, band gap current reference, low
Power consumption constant-current circuit and pwm control circuit, also include excess temperature electric current auto-adjusting circuit and Overtemperature protection circuit；Band-gap reference electricity
The input of potential source accesses input voltage, the outfan of bandgap voltage reference be linked into low power loss constant circuit input and
On the input of band gap current reference；The outfan of band gap current reference is connected with the input of low power loss constant circuit,
The outfan of low power loss constant circuit is connected with the input of pwm control circuit；Low power loss constant circuit and pwm control circuit
Outfan is in parallel to be accessed LED light group and accesses high level VCC, and the outfan of pwm control circuit and pwm control circuit also and couples
Ground；The input of band gap current reference also accesses excess temperature electric current auto-adjusting circuit and Overtemperature protection circuit；Band-gap reference electricity
The external inductive reactance of input in stream source is simultaneously grounded.
Preferably, described excess temperature electric current auto-adjusting circuit includes P-type channel switching tube（P1、P2、P3、P4）, N-type switch
Pipe（N1、N2、N3）, comparator A1, operational amplifier A 2, PNP triode（Q1、Q2、 Q3）And resistance（R0, R1）；Comparator A1
Negative pole series resistance R1 and be linked into reference voltage V1On the emitter stage of PNP triode Q1；The base stage of PNP triode Q1 and
Colelctor electrode series connection ground connection；The positive pole of comparator A1 connects reference voltage V2；The outfan of comparator A1 is linked into P-type channel switching tube
The grid of P1, N type switch tube N1 and N type switch tube N2, the drain electrode of P-type channel switching tube P1 and the series connection of N type switch tube N1 access
To voltage V4On；The source electrode of P-type channel switching tube P1 is linked on the source electrode of N type switch tube N2, the source electrode string of N type switch tube N1
Connection resistance R3 is simultaneously linked in the drain electrode of N type switch tube N2, and be linked on the emitter stage of PNP triode Q3；PNP triode Q3
Base stage be linked into the emitter stage of PNP triode Q2, the colelctor electrode of colelctor electrode parallel connection PNP triode Q2 of PNP triode Q3 and
The base stage of PNP triode Q2 is simultaneously grounded；The source electrode of P-type channel switching tube P1 is also linked on the positive pole of operational amplifier A 2, fortune
Calculate negative pole series resistance R0 of amplifier A2 and be grounded；The output calculating amplifier A2 terminates on the grid of N type switch tube N3, N
The source ground of type switching tube N3, drain electrode is linked on the grid and sources connected in parallel port of P-type channel switching tube P2；P-type channel
The drain series of the drain electrode of switching tube P2 and P-type channel switching tube P3 are linked into voltage V4On, the source electrode of P-type channel switching tube P3
It is connected in the drain electrode of P-type channel switching tube P4；
Preferably, described low power loss constant circuit includes operational amplifier A 3 and N type switch tube（N4、N5、N6）；Computing is put
The positive pole of big device A3 is linked in LED light group, and the negative pole of operational amplifier A 3 is linked into N type switch tube N4 source electrode and is switched with N-type
On the serial connection port of the drain electrode of pipe N5；The drain electrode of N type switch tube N4 is linked on the grid of N type switch tube N5, N type switch tube N5
With N type switch tube N6 common gate, the drain series of N type switch tube N6 are linked in LED light group, and are linked into high level VCC, N
The source electrode of type switching tube N6 and the source ground of N type switch tube N5.
Preferably, the resistance of described resistance R0, resistance R1 and resistance R3 is all equal.
Compared with prior art, the beneficial effects of the utility model are：
（1）This current automatic adaptation low-power consumption LED drive circuit, replaces conventional mistake using excess temperature electric current auto-adjusting circuit
Warm power-off protecting circuit is realizing the automatically adjustable of output current；Low power loss constant is designed using operational amplifier and current mirror
Circuit, realizes LED constant current and drives and low-power consumption.
（2）This current automatic adaptation low-power consumption LED drive circuit, by choosing different sampling resistor R0, this circuit can
Realize arbitrary value steady state value output in 0～2A current range；When chip temperature reaches 120 DEG C of overheat protector point, this circuit energy
Realize output current and rise with temperature only adapting to adjust, it is to avoid direct power-off or electric current rapidly go to zero brought the drawbacks of,
And current automatic adaptation adjusts the rising that can prevent temperature, realizes temperature self regulation, not only protects chip, saves energy
Amount, is more suitable for the fields such as common large area lighting.
（3）This current automatic adaptation low-power consumption LED drive circuit, it is defeated that low power loss constant circuit can realize constant current at lower voltages
Go out, when maximum output current ILED is 2A, the total power consumption as little as 0.114W of chip, oneself power consumption is low, is more suitable for lighting field.
（4）This current automatic adaptation low-power consumption LED drive circuit, circuit reduces the required precision to sampling resistor R0, literary composition
In sampling resistor all more than 50 ohm, effectively eliminated the disadvantage that in common circuit, resistance value is brought below 1 ohm
End.
Brief description
Fig. 1 is LED drive circuit entire block diagram of the present utility model；
Fig. 2 is excess temperature electric current auto-adjusting circuit figure of the present utility model；
Fig. 3 is low power loss constant circuit diagram of the present utility model.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely description is it is clear that described embodiment is only a part of embodiment of this utility model rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of making creative work
The every other embodiment being obtained, broadly falls into the scope of this utility model protection.
Refer to Fig. 1-3, this utility model provides a kind of technical scheme：A kind of current automatic adaptation low-power consumption LED drives electricity
Road, including bandgap voltage reference, band gap current reference, low power loss constant circuit and pwm control circuit, also includes excess temperature electricity
Stream auto-adjusting circuit and Overtemperature protection circuit；The input of bandgap voltage reference accesses input voltage, bandgap voltage reference
The outfan in source is linked on the input of low power loss constant circuit and the input of band gap current reference；Band-gap reference electric current
The outfan in source is connected with the input of low power loss constant circuit, the outfan of low power loss constant circuit and pwm control circuit
Input connects；The outfan of low power loss constant circuit and pwm control circuit is in parallel to be accessed LED light group and accesses high level VCC,
The outfan of pwm control circuit and pwm control circuit also earth；The input of band gap current reference also accesses excess temperature electricity
Stream auto-adjusting circuit and Overtemperature protection circuit；The external inductive reactance of input of band gap current reference is simultaneously grounded.
Described excess temperature electric current auto-adjusting circuit includes P-type channel switching tube（P1、P2、P3、P4）, N type switch tube（N1、
N2、N3）, comparator A1, operational amplifier A 2, PNP triode（Q1、Q2、 Q3）And resistance（R0, R1）；The negative pole of comparator A1
Series resistance R1 is simultaneously linked into reference voltage V1On the emitter stage of PNP triode Q1；The base stage of PNP triode Q1 and colelctor electrode
Series connection ground connection；The positive pole of comparator A1 connects reference voltage V 2；The outfan of comparator A1 is linked into P-type channel switching tube P1, N-type
Switching tube N1 and the grid of N type switch tube N2, the drain electrode of P-type channel switching tube P1 and the series connection of N type switch tube N1 are linked into voltage
On V4；The source electrode of P-type channel switching tube P1 is linked on the source electrode of N type switch tube N2, the source series resistance of N type switch tube N1
R3 is simultaneously linked in the drain electrode of N type switch tube N2, and be linked on the emitter stage of PNP triode Q3；The base stage of PNP triode Q3
It is linked into the emitter stage of PNP triode Q2, the colelctor electrode of colelctor electrode parallel connection PNP triode Q2 of PNP triode Q3 and PNP tri- pole
The base stage of pipe Q2 is simultaneously grounded；The source electrode of P-type channel switching tube P1 is also linked on the positive pole of operational amplifier A 2, operational amplifier
Negative pole series resistance R0 of A2 is simultaneously grounded；The output calculating amplifier A2 terminates on the grid of N type switch tube N3, N type switch tube
The source ground of N3, drain electrode is linked on the grid and sources connected in parallel port of P-type channel switching tube P2；P-type channel switching tube P2
Drain electrode and the drain series of P-type channel switching tube P3 be linked on voltage V4, the source electrode of P-type channel switching tube P3 is connected to p-type
In the drain electrode of channel switches pipe P4；The resistance of resistance R0, resistance R1 and resistance R3 is all equal.
Described low power loss constant circuit includes operational amplifier A 3 and N type switch tube（N4、N5、N6）；Operational amplifier A 3
Positive pole be linked in LED light group, the negative pole of operational amplifier A 3 is linked into N type switch tube N4 source electrode and N type switch tube N5
On the serial connection port of drain electrode；The drain electrode of N type switch tube N4 is linked on the grid of N type switch tube N5, N type switch tube N5 and N-type
Switching tube N6 common gate, the drain series of N type switch tube N6 are linked in LED light group, and are linked into high level VCC, and N-type switchs
The source electrode of pipe N6 and the source ground of N type switch tube N5.
The operation principle of excess temperature electric current auto-adjusting circuit is：
（1）When chip temperature is not reaching to over-temperature protection point, V2<V3, that is, the positive terminal voltage of comparator A1 be less than
Anti-phase terminal voltage, is low level signal after comparator A1 after exporting, and this signal promotes P1 switching tube to turn on, N type switch tube N1
Switching tube ends；Now, reference voltage V 4 is directly connected to the operation amplifier in reference current generating circuit by P1 switching tube
The in-phase input end of device A2；According to the empty short definition of operational amplifier, resistance R0On voltage be V4, and because reference voltage V4
It is constant, Formulas I is expressed by reference currentset=VD1/R0Understand, the R that some is determined0, IsetAlso keep constant.
（2）When being gradually increasing with chip temperature, the emitter stage of audion Q1 and base voltage VebDecline therewith, work as temperature
When rising to overheat protector point, VebJust drop to Veb<V2, i.e. V2>V3, now, comparator is output as high level signal, should
Signal makes P1 switching tube end, N type switch tube N1, the conducting of N type switch tube N2, and reference voltage V 4 passes through N type switch tube N1, N-type
Switching tube N2 is connected to the input of the in-phase end of operational amplifier A 2 in reference current generating circuit；And right, it is directly accessed void
The voltage of the in-phase end of outer frame A2 is the series voltage of PNP triode Q2 and PNP triode Q3 composition（Veb2+Veb3）, as two
Individual semiconductor PN voltage sum, because PN junction voltage has negative temperature coefficient feature, therefore, Veb2+Veb3Upper with temperature
Rise and decline, reference current expression Formulas I when accordinglyset=（Veb2+Veb3）/R0Understand, IsetRising also with temperature is automatic
Decline, this circuit realiration excess temperature electric current can be automatically adjustable, it is to avoid conventional chip takes power-off or the electric current to be quickly reduced to zero
Impact to lighting field.
Low power loss constant circuit work process is analyzed：
（1）Normal circuit operation process is：Because operational amplifier puts the high-gain clamping action of A3, remain homophase
End and anti-phase terminal voltage are equal, i.e. V+= V_, that is, N type switch tube N5 and N type switch tube N6 drain voltage equal, this
In the case of, N type switch tube N5 and N type switch tube N6 altogether grid, common source, leak altogether, strictly constitute current mirror, can be obtained by formula
Know, ILEDElectric current is only relevant with the ratio of the breadth length ratio of N5 and N6, and N type switch tube N5 and N type switch tube N6 can be operated in linearly
Area.Reference current I in designing hereinsetPeak is 20mA, that is, the electric current flowing through N5 is 20mA, so flowing through N type switch tube
The electric current of N6 is 2A.
（2）If a certain reason leads to N type switch tube N6 drain voltage to increase（N type switch tube N6 drain voltage is by outside
There is provided, represented with symbol V during software emulation）, i.e. operational amplifier A 3 in-phase end input voltage increase, by operational amplifier
The effect of A3, then N type switch tube N4 grid voltage be consequently increased, and IsetIt is a reference current source, keep constant, therefore N-type
The drain voltage of switching tube N4 reduces, further result in that the drain voltage of N5 increases, grid step voltage reduces, i.e. operational amplifier
Anti-phase terminal voltage increases, and finally promotes the in-phase end of operational amplifier A 3 and anti-phase terminal voltage equal, maintains N type switch tube all the time
N5 becomes 1 with the electric current of N type switch tube N6:100 ratio output.If a certain reason leads to N6 drain voltage to reduce, otherwise also
So.
（3）If a certain reason leads to N type switch tube N6 drain voltage to increase, the voltage after rising makes operational amplifier A 3 enter
When entering to saturation region, although operational amplifier A 3 no longer works, N type switch tube N6 and N type switch tube N5 come into full
And area, and N type switch tube N6 and N type switch tube N5 cascade pole, meet the current mirror relationship of saturation region, circuit output electricity
Stream ILEDStill only relevant with the ratio of the breadth length ratio of N type switch tube N6 and N type switch tube N5, output current still can keep constant
Constant.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out with multiple changes in the case of without departing from principle of the present utility model and spirit, repair
Change, replace and modification, scope of the present utility model is defined by the appended claims and the equivalents thereof.
Claims (4)
1. a kind of current automatic adaptation low-power consumption LED drive circuit, including bandgap voltage reference, band gap current reference, low work(
Consumption constant-current circuit and pwm control circuit it is characterised in that：Also include excess temperature electric current auto-adjusting circuit and Overtemperature protection circuit；
The input of bandgap voltage reference accesses input voltage, and the outfan of bandgap voltage reference is linked into low power loss constant circuit
Input and band gap current reference input on；The outfan of band gap current reference is defeated with low power loss constant circuit
Enter end to be connected, the outfan of low power loss constant circuit is connected with the input of pwm control circuit；Low power loss constant circuit and PWM
The outfan of control circuit is in parallel to be accessed LED light group and accesses high level VCC, the output of pwm control circuit and pwm control circuit
Earth is gone back at end；The input of band gap current reference also accesses excess temperature electric current auto-adjusting circuit and Overtemperature protection circuit；
The external inductive reactance of input of band gap current reference is simultaneously grounded.
2. a kind of current automatic adaptation low-power consumption LED drive circuit according to claim 1 it is characterised in that：Described excess temperature
Electric current auto-adjusting circuit includes P-type channel switching tube（P1、P2、P3、P4）, N type switch tube（N1、N2、N3）, comparator A1,
Operational amplifier A 2, PNP triode（Q1、Q2、 Q3）And resistance（R0, R1）；Negative pole series resistance R1 of comparator A1 simultaneously accesses
To reference voltage V1On the emitter stage of PNP triode Q1；The base stage of PNP triode Q1 and colelctor electrode series connection ground connection；Comparator
The positive pole of A1 connects reference voltage V 2；The outfan of comparator A1 is linked into P-type channel switching tube P1, N type switch tube N1 and N-type and opens
Close the grid of pipe N2, the drain electrode of P-type channel switching tube P1 and the series connection of N type switch tube N1 are linked on voltage V4；P-type channel switchs
The source electrode of pipe P1 is linked on the source electrode of N type switch tube N2, and the source series resistance R3 of N type switch tube N1 is simultaneously linked into N-type and opens
Close in the drain electrode of pipe N2, and be linked on the emitter stage of PNP triode Q3；The base stage of PNP triode Q3 is linked into PNP triode
The emitter stage of Q2, the colelctor electrode parallel connection colelctor electrode of PNP triode Q2 of PNP triode Q3 and the base stage of PNP triode Q2 simultaneously connect
Ground；The source electrode of P-type channel switching tube P1 is also linked on the positive pole of operational amplifier A 2, the negative pole series electrical of operational amplifier A 2
Resistance R0 is simultaneously grounded；The output calculating amplifier A2 terminates on the grid of N type switch tube N3, the source ground of N type switch tube N3, leakage
Pole is linked on the grid and sources connected in parallel port of P-type channel switching tube P2；The drain electrode of P-type channel switching tube P2 and P-type channel
The drain series of switching tube P3 are linked on voltage V4, and the source electrode of P-type channel switching tube P3 is connected to the leakage of P-type channel switching tube P4
Extremely go up.
3. a kind of current automatic adaptation low-power consumption LED drive circuit according to claim 1 it is characterised in that：Described low work(
Consumption constant-current circuit includes operational amplifier A 3 and N type switch tube（N4、N5、N6）；The positive pole of operational amplifier A 3 is linked into LED
In group, the negative pole of operational amplifier A 3 is linked on N type switch tube N4 source electrode and the serial connection port of drain electrode of N type switch tube N5；N
The drain electrode of type switching tube N4 is linked on the grid of N type switch tube N5, N type switch tube N5 and N type switch tube N6 common gate, N-type
The drain series of switching tube N6 are linked in LED light group, and are linked into high level VCC, and the source electrode of N type switch tube N6 and N-type are opened
Close the source ground of pipe N5.
4. a kind of current automatic adaptation low-power consumption LED drive circuit according to claim 1 it is characterised in that：Described resistance
The resistance of R0, resistance R1 and resistance R3 is all equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620675840.2U CN205961501U (en) | 2016-07-01 | 2016-07-01 | Electric current self -adaptation low -power consumption LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620675840.2U CN205961501U (en) | 2016-07-01 | 2016-07-01 | Electric current self -adaptation low -power consumption LED drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205961501U true CN205961501U (en) | 2017-02-15 |
Family
ID=57969548
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620675840.2U Expired - Fee Related CN205961501U (en) | 2016-07-01 | 2016-07-01 | Electric current self -adaptation low -power consumption LED drive circuit |
Country Status (1)
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| CN (1) | CN205961501U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108572687A (en) * | 2017-03-09 | 2018-09-25 | 华润矽威科技（上海）有限公司 | A kind of excess temperature compensation circuit and method |
| CN109089345A (en) * | 2018-08-14 | 2018-12-25 | 上海艾为电子技术股份有限公司 | Thermal-shutdown circuit and the electronic equipment for applying it |
-
2016
- 2016-07-01 CN CN201620675840.2U patent/CN205961501U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108572687A (en) * | 2017-03-09 | 2018-09-25 | 华润矽威科技（上海）有限公司 | A kind of excess temperature compensation circuit and method |
| CN108572687B (en) * | 2017-03-09 | 2020-04-28 | 华润矽威科技（上海）有限公司 | Over-temperature compensation circuit and method |
| CN109089345A (en) * | 2018-08-14 | 2018-12-25 | 上海艾为电子技术股份有限公司 | Thermal-shutdown circuit and the electronic equipment for applying it |
| CN109089345B (en) * | 2018-08-14 | 2024-03-22 | 上海艾为电子技术股份有限公司 | Over-temperature protection circuit and electronic equipment applying same |
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Granted publication date: 20170215 Termination date: 20170701 |
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| CF01 | Termination of patent right due to non-payment of annual fee |