CN206272903U - A kind of LED linear constant-current circuit for having output short circuit protection function - Google Patents
A kind of LED linear constant-current circuit for having output short circuit protection function Download PDFInfo
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- CN206272903U CN206272903U CN201621419591.7U CN201621419591U CN206272903U CN 206272903 U CN206272903 U CN 206272903U CN 201621419591 U CN201621419591 U CN 201621419591U CN 206272903 U CN206272903 U CN 206272903U
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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 a kind of LED linear constant-current circuit for having output short circuit protection function; it is mainly used in the fields such as D/C power, LED drivings and other is based on systems of linear work and realizes to output voltage or the regulatory function of electric current; LED linear constant-current circuit line regulation can reliably be improved; the precision of output current is improved, and realizes output short circuit protection function.
Description
Technical field
The utility model discloses a kind of LED linear constant-current circuit for having output short circuit protection function, it is mainly used in DC electricity
The fields such as source, LED drivings and other systems for being based on linear work and realization, can to output voltage or the regulatory function of electric current
It is reliable to improve LED linear constant-current circuit line regulation, the precision of output current is improved, and realize output short circuit protection work(
Energy.
Background technology
LED linear constant-current circuit has system cost low, and chip periphery circuit is few, compatible E14 and E16 lamp holders application,
Easily same mistake the advantages of EMI is tested is widely used.
Fig. 1 is a kind of circuit diagram of traditional LED linear constant-current circuit.
Traditional LED linear constant-current circuit occurs that output current changing with input voltage and changing excessive problem.And
And cannot in output short-circuit protection system, so as to cause chip to be damaged because internal loss is too high.
As shown in Fig. 2 due to when input voltage less than LED load voltage when, the electric current of LED load relies primarily on output
Electric capacity Cout is maintained.And under different input voltages, the input voltage in a power frequency period is less than the voltage of LED load
Time change is very big, causes the line regulation of traditional LED linear constant-current circuit very poor, light fixture when causing input voltage low
Luminous flux is deteriorated, and have impact on the comfort level that user uses.In addition, cannot be ensured in chip power supply by each power frequency valley floor
Normally, so traditional LED linear constant-current circuit cannot all realize output short circuit protection function.
Utility model content
Problem to be solved in the utility model is to provide a kind of LED linear Constant Electric Current for having output short circuit protection function
Road, can improve the line regulation characteristic of LED linear constant-current circuit, and the light higher of light fixture when realizing that input voltage is low leads to
Amount, improves the comfort level that user uses.Additionally, it is provided in output short-circuit, closing power tube, protection chip will not be because of interior
The function that portion's loss is too high and damages.
The utility model provides a kind of LED linear constant-current circuit for having output short circuit protection function, including：Linear constant current electricity
Road, short-circuit protection circuit, power supply circuit, rectifier bridge, bus capacitor Cbus, LED load, output capacitance Cout；Rectifier bridge it is defeated
Enter end input AC AC powers, an output end of rectifier bridge one end respectively with bus capacitor Cbus, power supply circuit, LED bear
One end connection of one end, output capacitance Cout of load；It is the other end of the LED load other end respectively with output capacitance Cout, short
Road protection circuit, linear constant current circuit connection；Short-circuit protection circuit is connected with linear constant current circuit；Bus capacitor Cbus's is another
End ground connection；Another output end of rectifier bridge is also grounded.
Preferably, short-circuit protection circuit includes, M1 is switched；The drain electrode for switching M1 is connected with linear constant current circuit.
Preferably, short-circuit protection circuit also includes, first comparator cmp1, current source I1, triode pnp1, the second ratio
Compared with device cmp2, the 3rd comparator cmp3 and door and1, nor gate nor1 and nor gate nor2；The other end of LED load respectively with
The negative terminal connection of the 3rd comparator cmp3 in anode, the short-circuit protection circuit of first comparator cmp1；The of short-circuit protection circuit
The negative terminal of one comparator cmp1 connects fixed voltage vrefH, the output termination of first comparator cmp1 and one end of door and1；Electric current
The upper termination power Vdd of source I1；The emitter stage of the lower termination triode pnp1 of current source I1, the second comparator of amplifier cmp2 it is negative
End；The base stage and grounded collector of triode pnp1；The output termination of the second comparator cmp2 and the other end of door and1；3rd
One end of the output termination nor gate nor2 of the positive termination fixed voltage vrefL of comparator cmp3, the 3rd comparator cmp3；With door
One end of the output termination nor gate nor1 of and1；The other end of the output termination nor gate nor2 of nor gate nor1；Nor gate
The other end and the grid of switch M1 of the output termination nor gate nor2 of nor2；Switch the source ground of M1.
Preferably, linear constant current circuit includes, power tube Mdrain；The drain electrode of power tube Mdrain and LED load
The other end is connected, and grid is connected with short-circuit protection circuit.
Preferably, linear constant current circuit also includes, the first amplifier amp1, power tube Mdrain, output electric current measure electricity
Resistance Rs, the second amplifier amp2 and electric capacity Cea；The fixed voltage of positive termination first of the second amplifier amp2 of linear constant current circuit
The negative terminal of Vref1, the second amplifier amp2 connects negative terminal, the source of power tube Mdrain and the output electric current measure of the first amplifier amp1
Resistance Rcs；The output end of the second amplifier amp1 connects one end of electric capacity Cea, the anode of the first amplifier amp1 respectively；First amplifier
The output end of amp1 connects the grid end of power tube Mdrain, short-circuit protection respectively；The output electric current measure resistance Rs other ends are grounded；Electricity
Hold the other end ground connection of Cea.
Preferably, power supply circuit includes：High voltage depletion mode metal-oxide-semiconductor jfet1；The grid chip termination of depletion type MOS jfet1
The grid end ground connection of internal electric source vdd, depletion type MOS jfet1.
Preferably, power tube Mdrain can be using PMOS, NMOS tube, PNP pipe or NPN pipe.
Preferably, triode pnp1 can be using pnp pipes, npn pipes, diode or metal-oxide-semiconductor.
Preferably, switch M1 can be using PMOS, NMOS tube, PNP pipe or NPN pipe.
The LED linear constant-current circuit of a kind of tool output short circuit protection function that the utility model is provided, due to increasing constant current
The dynamic regulation function of benchmark, can reliably improve LED linear constant-current circuit line regulation, improve the essence of output current
Degree；And due to increasing output short circuit protection function, it is possible to increase the reliability of system, system failure in preventing from applying.
Brief description of the drawings
Fig. 1 is the circuit diagram of traditional LED linear constant-current circuit.
Fig. 2 is the work wave of traditional LED linear constant-current circuit.
Fig. 3 is a kind of block diagram of the LED linear constant-current circuit of the tool output short circuit protection function in the utility model.
Fig. 4 is a kind of LED linear constant-current circuit current constant control of the tool output short circuit protection function in the utility model
Work wave.
Fig. 5 is a kind of non-shorting protection of LED linear constant-current circuit of the tool output short circuit protection function in the utility model
The work wave of state.
Fig. 6 is a kind of LED linear constant-current circuit short-circuit protection shape of the tool output short circuit protection function in the utility model
The work wave of state.
Specific embodiment：
Below in conjunction with accompanying drawing, the utility model is described further.
Fig. 3 is a kind of block diagram of the LED linear constant-current circuit for having output short circuit protection function.
As shown in figure 3, a kind of LED linear constant-current circuit for having output short circuit protection function, including：Including：Linear constant current
Circuit, short-circuit protection circuit, power supply circuit, rectifier bridge, bus capacitor Cbus, LED load, output capacitance Cout.
Linear constant current circuit includes：First amplifier amp1, power tube Mdrain, output electric current measure resistance Rs, the second fortune
Put amp2 and electric capacity Cea.Short-circuit protection circuit includes：First comparator cmp1, current source I1, triode pnp1, second are compared
Device cmp2, the 3rd comparator cmp3 and door and1, nor gate nor1, nor gate nor2 and switch M1.Power supply circuit includes：It is high
Pressure depletion type MOS tube jfet1.
The input input AC AC powers of rectifier bridge.One output end of rectifier bridge is respectively with the one of bus capacitor Cbus
End, one end connection of the drain terminal of the depletion type MOS jfet1 of power supply circuit, the anode of LED load, output capacitance Cout.LED bears
The anode of first comparator cmp1, short circuit are protected in the negative terminal of the load other end, short-circuit protection circuit respectively with output capacitance Cout
The drain terminal connection of the negative terminal of the 3rd comparator cmp3 and power tube Mdrain in protection circuit；Another termination of bus capacitor Cbus
Ground；Another output end of rectifier bridge is also grounded.
The first fixed voltage of positive termination Vref1 of the second amplifier amp2 of linear constant current circuit.Second amplifier amp2's is negative
Terminate negative terminal, the source of power tube Mdrain and the output electric current measure resistance Rcs of the first amplifier amp1.Second amplifier amp1's
Output end connects one end of electric capacity Cea, the anode of the first amplifier amp1 respectively.The other end ground connection of electric capacity Cea.First amplifier amp1
Output end connect the grid end of power tube Mdrain, the drain terminal of short-circuit protection circuit breaker in middle M1 respectively.Output electric current measure resistance
The source electrode of the one termination power tube Mdrain of Rs, other end ground connection.
The negative terminal of the first comparator cmp1 of short-circuit protection circuit meets fixed voltage vrefH.First comparator cmp1's is defeated
Go out one end of termination and door and1.The positive termination fixed voltage vref2 of the second comparator cmp2 of short-circuit protection circuit.Current source
The upper termination power Vdd of I1；The emitter stage of the lower termination triode pnp1 of current source I1, the second comparator of amplifier cmp2 it is negative
End.The base stage and grounded collector of triode pnp1.The output termination of the second comparator cmp2 and the other end of door and1.3rd
The positive termination fixed voltage vrefL of comparator cmp3.One end of the output termination nor gate nor2 of the 3rd comparator cmp3.With door
One end of the output termination nor gate nor1 of and1.The other end of the output termination nor gate nor2 of nor gate nor1.Nor gate
The other end and the grid of switch M1 of the output termination nor gate nor2 of nor2.Switch the source ground of M1.
The source of depletion type MOS jfet1 meets chip internal power supply vdd；The grid end ground connection of depletion type MOS jfet1.
Power tube Mdrain can be using PMOS, NMOS tube, PNP pipe or NPN pipe.
Triode pnp1 can be using pnp pipes, npn pipes, diode or metal-oxide-semiconductor.
Switch M1 can be using PMOS, NMOS tube, PNP pipe or NPN pipe.
The LED linear constant-current circuit of a kind of tool output short circuit protection function that the utility model is provided, due to increasing constant current
The dynamic regulation function of benchmark, can reliably improve LED linear constant-current circuit line regulation, improve the essence of output current
Degree；Due to increasing output short circuit protection function, it is possible to increase the reliability of system, system failure in preventing from applying.
The utility model provide a kind of tool output short circuit protection function LED linear constant-current circuit current constant control it is specific
Operation principle is：
As shown in figure 4, when input voltage Vac is more than LED load voltage Vled, circuit is in input power supply state, LED
Powered by AC AC powers；When input voltage Vac is less than LED load voltage Vled, circuit is in electric capacity and maintains state,
LED is powered by output capacitance Cout.
Input voltage Vac is bigger, and the time that circuit is in input power supply state is more long, and circuit is in electric capacity and maintains state
Time is shorter, and output current is bigger；Conversely, smaller.Vled is bigger for LED load voltage, circuit be in input power supply state when
Between it is shorter, circuit be in electric capacity maintain state time it is more long, output current is smaller；Conversely, bigger.
The output current average value letter that voltage Vs on detection output electric current measure resistance Rcs reflects in whole power frequency period
Breath.By detecting the voltage Vs in whole power frequency period on output electric current measure resistance Rcs, compare with fixed voltage vref1, such as
The average value of fruit voltage Vs is less than vref1, then the second amplifier amp2 charges to electric capacity Cea, increases the voltage of electric capacity Cea
Vea, and then increasing circuit is in output current when being input into power supply state, so as to increase output current；, whereas if voltage Vs
Average value be more than vref1, then the second amplifier amp2 discharges electric capacity Cea, reduces the voltage Vea of electric capacity Cea, and then subtracts
Small circuit is in output current during input power supply state, so as to reduce output current.
The size of output current Io is：
A kind of LED linear constant-current circuit output short circuit protection of tool output short circuit protection function that the utility model is provided
Concrete operating principle is：
As shown in figure 3, chip power supply circuit is sampled from bus Vbus power, so as to ensure chip energy near power frequency valley floor
Enough power supplies are sufficient, and electricity will not be descended to restart such that it is able to when chip internal relay protective scheme can always be protected in multiple power frequency periods
Hold.
As shown in figure 5, the maximum electricity that power tube Mdrain when fixed voltage vrefH is set greater than normal work drains
Pressure, the voltage of bus BUS during less than normal work；It is general to choose 30~100V.Fixed voltage vrefH is set smaller than normally
The maximum voltage of power tube Mdrain drain electrodes during work, typically chooses 30~3V.
Because output capacitance Cout two ends need to slowly rise to LED normally pressure drops from 0V, when chip normally starts
When, the maximum voltage of power tube Mdrain drain electrodes exports high level more than fixed voltage vrefH, DH logic；Due to three poles
The emitter stage of pipe pnp1 and the pressure difference vbe of base stage are varied with temperature in negative temperature characteristic, when chip normally starts, chip
Temperature is in normal range (NR), and voltage vbe exports low level more than fixed voltage vref2, TH logic；Scp logics are low, switch
M1 is closed, system worked well.With the increase of output voltage, the maximum voltage of power tube Mdrain drain electrodes is from equal to bus
The voltage of BUS is tapered into normal value, and the output of DH logics keeps low level.
As shown in fig. 6, when there is output short-circuit, power tube Mdrain drain voltages are equal to busbar voltage, power
The maximum voltage of pipe Mdrain drain electrodes exports high level more than fixed voltage vrefH, DH logic；Due to the transmitting of triode pnp1
The pressure difference vbe of pole and base stage is varied with temperature in negative temperature characteristic, and when there is output short-circuit, chip thermal losses is very big,
Chip temperature is gradually risen within normal range (NR), and voltage vbe is gradually reduced, until voltage vbe is less than fixed voltage vref2,
TH logics export high level；Scp logics are height, and switch M1 conductings, power tube Mdrain shut-offs, system enters output short circuit protection
State.
After output recovers normal from short-circuit condition, power tube Mdrain drain voltages are gradually reduced, and work as power tube
Mdrain drain voltages export step-down, scp logics output step-down less than fixed voltage vrefL, DH logic, and switch M1 shut-offs are
System normal work again.
Although content of the present utility model is discussed in detail by above preferred embodiment, but it should be appreciated that on
The description stated is not considered as to limitation of the present utility model.After those skilled in the art have read the above, for
Various modifications and substitutions of the present utility model all will be apparent.It is any without departing from the utility model spirit
Utility model is created, and including but not limited to resistance implementation such as Rcs uses conventional, electric-resistance or MOS resistance, the class to component
Mdrain is such as substituted for triode by the replacement of type or model, the input of the second comparator is changed to fixed voltage and increases temperature coefficient
Voltage ratio is compared with waiting, the change such as power supply circuit of circuit local structure is changed to close-loop control mode, remove bus capacitor Cbus or
Bus capacitor Cbus is changed to RC series-parallel networks etc., and the replacement of other unsubstantialities, deformation or is changed, each fall within this reality
Within the scope of novel protected.
Claims (9)
1. it is a kind of have output short circuit protection function LED linear constant-current circuit, it is characterised in that：Including：It is linear constant current circuit, short
Road protection circuit, power supply circuit, rectifier bridge, bus capacitor Cbus, LED load, output capacitance Cout；
Wherein, the input input AC AC powers of rectifier bridge, an output end of rectifier bridge is respectively with bus capacitor Cbus's
One end, power supply circuit, one end of LED load, one end connection of output capacitance Cout；
The other end of the LED load other end respectively with output capacitance Cout, short-circuit protection circuit, linear constant current circuit are connected；
Short-circuit protection circuit is connected with linear constant current circuit；
The other end ground connection of bus capacitor Cbus；Another output end of rectifier bridge is also grounded.
2. a kind of LED linear constant-current circuit for having output short circuit protection function as claimed in claim 1, it is characterised in that：
Short-circuit protection circuit includes, switchs M1；The drain electrode for switching M1 is connected with linear constant current circuit.
3. a kind of LED linear constant-current circuit for having output short circuit protection function as claimed in claim 1, it is characterised in that：
Short-circuit protection circuit also includes, first comparator cmp1, current source I1, triode pnp1, the second comparator cmp2, the 3rd
Comparator cmp3 and door and1, nor gate nor1 and nor gate nor2；
3rd comparator cmp3 in the other end of LED load anode, short-circuit protection circuit respectively with first comparator cmp1
Negative terminal is connected；
The negative terminal of the first comparator cmp1 of short-circuit protection circuit meets fixed voltage vrefH, the output end of first comparator cmp1
Connect the one end with door and1；
The upper termination power Vdd of current source I1；Emitter stage, the comparator of amplifier second of the lower termination triode pnp1 of current source I1
The negative terminal of cmp2；
The base stage and grounded collector of triode pnp1；
The output termination of the second comparator cmp2 and the other end of door and1；
The output termination nor gate nor2's of the positive termination fixed voltage vrefL of the 3rd comparator cmp3, the 3rd comparator cmp3
One end；
With one end of the output termination nor gate nor1 of door and1；The output termination nor gate nor2's of nor gate nor1 is another
End；The other end and the grid of switch M1 of the output termination nor gate nor2 of nor gate nor2；
Switch the source ground of M1.
4. a kind of LED linear constant-current circuit for having output short circuit protection function as claimed in claim 1 or 2, it is characterised in that：
Linear constant current circuit includes, power tube Mdrain；
The drain electrode of power tube Mdrain is connected with the other end of LED load, and grid is connected with short-circuit protection circuit.
5. a kind of LED linear constant-current circuit for having output short circuit protection function as claimed in claim 4, it is characterised in that：
Linear constant current circuit also includes, the first amplifier amp1, power tube Mdrain, output electric current measure resistance Rs, the second amplifier
Amp2 and electric capacity Cea；
The first fixed voltage of positive termination Vref1 of the second amplifier amp2 of linear constant current circuit, the negative terminal of the second amplifier amp2 connects
The negative terminal of the first amplifier amp1, the source of power tube Mdrain and output electric current measure resistance Rcs；
The output end of the second amplifier amp1 connects one end of electric capacity Cea, the anode of the first amplifier amp1 respectively；
The output end of the first amplifier amp1 connects the grid end of power tube Mdrain, short-circuit protection respectively；
The output electric current measure resistance Rs other ends are grounded；The other end ground connection of electric capacity Cea.
6. a kind of LED linear constant-current circuit for having output short circuit protection function as claimed in claim 1, it is characterised in that：
Power supply circuit includes：High voltage depletion mode metal-oxide-semiconductor jfet1；The grid end of depletion type MOS jfet1 meets chip internal power supply vdd,
The grid end ground connection of depletion type MOS jfet1.
7. a kind of LED linear constant-current circuit for having output short circuit protection function as claimed in claim 4, it is characterised in that：
Power tube Mdrain can be using PMOS, NMOS tube, PNP pipe or NPN pipe.
8. a kind of LED linear constant-current circuit for having output short circuit protection function as claimed in claim 3, it is characterised in that：
Triode pnp1 can be using pnp pipes, npn pipes, diode or metal-oxide-semiconductor.
9. a kind of LED linear constant-current circuit for having output short circuit protection function as claimed in claim 2, it is characterised in that：
Switch M1 can be using PMOS, NMOS tube, PNP pipe or NPN pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621419591.7U CN206272903U (en) | 2016-12-22 | 2016-12-22 | A kind of LED linear constant-current circuit for having output short circuit protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621419591.7U CN206272903U (en) | 2016-12-22 | 2016-12-22 | A kind of LED linear constant-current circuit for having output short circuit protection function |
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| Publication Number | Publication Date |
|---|---|
| CN206272903U true CN206272903U (en) | 2017-06-20 |
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ID=59047543
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621419591.7U Active CN206272903U (en) | 2016-12-22 | 2016-12-22 | A kind of LED linear constant-current circuit for having output short circuit protection function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108093520A (en) * | 2017-12-21 | 2018-05-29 | 厦门厦华科技有限公司 | A kind of protection circuit during electronic whiteboard LED short circuits |
| CN108182911A (en) * | 2017-11-16 | 2018-06-19 | 青岛海信电器股份有限公司 | Liquid crystal display device, LED backlight circuit and LED light bar power supply circuit |
| CN110099492A (en) * | 2019-05-29 | 2019-08-06 | 上海登芯微电子科技有限公司 | A kind of low power LED linear power circuit |
-
2016
- 2016-12-22 CN CN201621419591.7U patent/CN206272903U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108182911A (en) * | 2017-11-16 | 2018-06-19 | 青岛海信电器股份有限公司 | Liquid crystal display device, LED backlight circuit and LED light bar power supply circuit |
| CN108093520A (en) * | 2017-12-21 | 2018-05-29 | 厦门厦华科技有限公司 | A kind of protection circuit during electronic whiteboard LED short circuits |
| CN108093520B (en) * | 2017-12-21 | 2023-11-07 | 厦门厦华科技有限公司 | Protection circuit for electronic whiteboard LED short circuit |
| CN110099492A (en) * | 2019-05-29 | 2019-08-06 | 上海登芯微电子科技有限公司 | A kind of low power LED linear power circuit |
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