CN105282905B - Light adjusting circuit and the LED power feeding mechanism with the light adjusting circuit - Google Patents
Light adjusting circuit and the LED power feeding mechanism with the light adjusting circuit Download PDFInfo
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- CN105282905B CN105282905B CN201410298967.2A CN201410298967A CN105282905B CN 105282905 B CN105282905 B CN 105282905B CN 201410298967 A CN201410298967 A CN 201410298967A CN 105282905 B CN105282905 B CN 105282905B
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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
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- 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
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Abstract
LED power feeding mechanism of the invention on a kind of light adjusting circuit and with the light adjusting circuit, wherein the light adjusting circuit especially has a low level prevention unit, and the one of the low level prevention unit electrically holds the control dimming unit for being coupled to light adjusting circuit, its another electrically end then couples the constant current source inside light adjusting circuit；So, once user is respectively connected to more than two LED light emission devices and with single control dimming unit come when adjusting the luminosity of those LED light emission devices with more than two power conversion units, the low level prevention unit just can be when one of which power conversion unit be damaged or the situation of short circuit occurs, prevent the signal level for the dim signal that the control dimming unit exported from being pulled downwardly to low level, and then maintain the normal operation for the light adjusting circuit that another group of power conversion unit coordinate with it.
Description
Technical field
The present invention particularly relates to a kind of tune for possessing simple circuit structure, low cost on a kind of LED lamp light adjusting circuit
Optical circuit and the LED power feeding mechanism with the light adjusting circuit.
Background technology
In recent years, light emitting diode (Light-Emitting Diode, LED) is widely applied to the photograph of daily life
On bright device；However, the fast development in the market with LED light device, people are reliable for the product of LED light device
Constantly required in terms of degree, service life and environmental protection and energy saving, especially for the dimming function of LED light device.In addition, people couple
Energy saving can be achieveed the purpose that by being not only in that in the requirement of the dimming function of LED light device, be more how to utilize
Adjust the brightness of LED light device, colour temperature obtains more preferably quality of life.
In view of this, the various LED power supplies for possessing dimming function are proposed on the market.It is referring to Fig. 1, existing
A kind of circuit framework figure for the LED power supply for possessing dimming function.As shown in Figure 1, the existing LED for possessing dimming function
Power supply unit 1 ' includes：One first power conversion unit 11 ', one first driving unit 12 ' and a first switch unit
15 ', wherein, the one of one first LED light emission device 2 ' electrically holds the output terminal for being coupled to first power conversion unit 11 ', and
And the first switch unit 15 ' is coupled to another electrically end and first power conversion unit of first LED light emission device 2 '
Between 11 ' output terminal.
Above-mentioned explanation is held, user can send out light modulation letter by way of operating a dim signal generator 16 '
Number to first driving unit 12 ', then first driving unit 12 ' exports a drive signal to control according to the dim signal
The on off state (ON/OFF state) of the first switch unit 15 ' is made, thereby mode, which reaches, adjusts first LED light emission device
The purpose of 2 ' luminosity.
In addition, as shown in Figure 1, user can at the same time using include a second source converting unit 11a ', one second drive
A LED power supply 1a ' of moving cell 12a ' and a second switch unit 15a ' drive the LED light emission device 2a ' to shine；
Also, user can be reached while two groups of LED light emission devices by way of operating single dim signal generator 16 '
The purpose of the luminosity of (2 ', 2a ').
The LED power supply for possessing dimming function depicted in Fig. 1, it is wide since its body frame structure is very simple
It is applied to generally among LED light device or LED lamp；However, the inventor of this case has found that this possesses light modulation work(after research
The LED power supply of energy has following major defect：Due to the two LED powers supply (1 ', 1a ') while it is coupled to same
One dim signal generator 16 ', therefore, once one of which LED power supply 1 ' (or LED power supply 1a ') is ruined
Damage or when the situation of short circuit occurs, certainly will be inconjunction with will input to another group of LED power supply 1a ' (or LED power supply
1 ') signal level of dim signal is pulled to downwards low level, and causes second driving unit 12a ' (or first driving is single
Member 12 ') the output dim signal can not be continued to output；Finally, the LED power supply 1 ' (or LED power supply 1a ')
Damage will cause another group of LED power supply 1a ' (or LED power supply 1 ') can not normally LED light emission device 2a '
(or first LED light emission device 2 ') shines.
Therefore, still had the disadvantage in that and deficiency, this case in view of the existing LED power supply of current institute and its light adjusting circuit
Inventor strongly studied invention, research and development finally complete a kind of light adjusting circuit of the present invention and with the light adjusting circuits
LED power feeding mechanism.
The content of the invention
The main object of the present invention, is to provide a kind of light adjusting circuit and the LED power supply dress with the light adjusting circuit
Put, wherein the light adjusting circuit especially has a low level prevention unit, and electrically end is coupled to the one of the low level prevention unit
The control dimming unit of light adjusting circuit, its another electrically end then couple the constant current source inside light adjusting circuit；In this way, once use
Person is respectively connected to more than two LED light emission devices and with single control dimming unit with more than two power conversion units
Come when adjusting the luminosity of those LED light emission devices, which just can change in one of which power supply
When unit is damaged or the situation of short circuit occurs, prevent the signal level for the dim signal that the control dimming unit exported downward
It is pulled to low level, and then maintains the normal operation for the light adjusting circuit that another group of power conversion unit coordinate with it.
In order to reach the purpose of the present invention, the present invention proposes a kind of light adjusting circuit, including：
One constant current source, to produce a constant current；
One control dimming unit, is coupled to the constant current source, and export a dim signal after the constant current is received；
One filter unit, is coupled to the control dimming unit to receive the dim signal, and the dim signal is filtered
Ripple；
One light turn off and driving unit, be coupled to the filter unit with receive it is filtered after the dim signal, and then
Export a driving control signal；
One switch element, is coupled to light shut-off and is sent out with driving unit, an external power supply converting unit and an external LED
Electro-optical device, wherein, light shut-off is driven with the driving control signal with driving unit and controls the switch element, to make this outer
Portion's LED light emission device shines；And
One low level prevention unit, electrically end is coupled to the control dimming unit to one, and its another electrically end coupling should
Constant current source and the filter unit；Wherein, the low level prevention unit is preventing the signal level of the dim signal downward
It is pulled to low level.
Light adjusting circuit as described above, wherein, which includes：
One bipolar junction transistors, the low level prevention unit and the filter unit are coupled to its collector terminal；
One emitter resistance, its one end is coupled to the emitter-base bandgap grading end of the bipolar junction transistors, and its other end is coupled to one
Operating voltage；
One base resistance, its one end is coupled to the base terminal of the bipolar junction transistors, and the other end is grounded；And
Two diodes being one another in series, are coupled between the emitter resistance and the base resistance, and couple the work at the same time
Make voltage.
Light adjusting circuit as described above, wherein, this control dimming unit for variable resistor light modulator, direct current light modulator,
The combination of pulse-width modulation signal light modulator or above-mentioned both above.
Light adjusting circuit as described above, wherein, which includes：
One filter resistance, its one end are coupled to the constant current source and the low level prevention unit, its other end is then coupled to
The light turns off and driving unit；And
One filter capacitor, its one end are coupled to the other end and light shut-off and driving unit of the filter resistance, its is another
One end is then grounded.
Light adjusting circuit as described above, wherein, light shut-off and driving unit are a comparator, and the comparator has
The first input end that is coupled to a reference voltage, one second input terminal for being coupled to the filter unit and it is coupled to this and opens
Close an output terminal of unit.
Light adjusting circuit as described above, wherein, which is a power-type metal-oxide half field effect transistor.
Light adjusting circuit as described above, wherein, which is a diode.
Light adjusting circuit as described above, wherein, the power conversion unit is flyback power conversion unit, forward type
Power conversion unit, LLC resonant modes power supply changeover device or push-pull type power conversion unit.
Light adjusting circuit as described above, wherein, which is a metal-oxide half field effect transistor, and the gold oxygen
Half field effect transistor has a body diode；Wherein, the drain end of the metal-oxide half field effect transistor is coupled to the constant current source
With the filter unit, the source terminal of the metal-oxide half field effect transistor is coupled to the control dimming unit, and the OH is brilliant
The gate terminal of body pipe is coupled to the output terminal of the comparator.
A kind of LED power feeding mechanism with light adjusting circuit, including：
An at least power conversion unit, one AC power of coupling carry out electricity with the alternating current exported to the AC power
Pressure conversion, and then export a stabilized power source and give an at least LED light emission device；And
One light adjusting circuit, including：
One constant current source, to produce a constant current；
One control dimming unit, is coupled to the constant current source, and export a dim signal after the constant current is received；
One filter unit, is coupled to the control dimming unit to receive the dim signal, and the dim signal is filtered
Ripple；
One light turn off and driving unit, be coupled to the filter unit with receive it is filtered after the dim signal, and then
Export a driving control signal；
One switch element, is coupled to light shut-off and driving unit, the power conversion unit and the LED light emission device,
Wherein, light shut-off is driven with the driving control signal and controls the switch element with driving unit, to make the LED shine dress
Put luminous；And
One low level prevention unit, electrically end is coupled to the control dimming unit to one, and its another electrically end coupling should
Constant current source and the filter unit；Wherein, the low level prevention unit is preventing the signal level of the dim signal downward
It is pulled to low level.
The LED power feeding mechanism with light adjusting circuit as described above, wherein, which includes：
One bipolar junction transistors, the low level prevention unit and the filter unit are coupled to its collector terminal；
One emitter resistance, its one end is coupled to the emitter-base bandgap grading end of the bipolar junction transistors, and its other end is coupled to one
Operating voltage；
One base resistance, its one end is coupled to the base terminal of the bipolar junction transistors, and the other end is grounded；And
Two diodes being one another in series, are coupled between the emitter resistance and the base resistance, and couple the work at the same time
Make voltage.
The LED power feeding mechanism with light adjusting circuit as described above, wherein, it is variable resistor that this, which controls dimming unit,
Combination more than both light modulator, direct current light modulator, pulse-width modulation signal light modulator or above-mentioned.
The LED power feeding mechanism with light adjusting circuit as described above, wherein, which includes：
One filter resistance, its one end are coupled to the constant current source and the low level prevention unit, its other end is then coupled to
The light turns off and driving unit；And
One filter capacitor, its one end are coupled to the other end and light shut-off and driving unit of the filter resistance, its is another
One end is then grounded.
The LED power feeding mechanism with light adjusting circuit as described above, wherein, light shut-off is one with driving unit
Comparator, and the comparator have be coupled to a first input end of a reference voltage, be coupled to the one second of the filter unit
Input terminal and the output terminal for being coupled to the switch element.
The LED power feeding mechanism with light adjusting circuit as described above, wherein, which is a power-type gold oxygen
Half field effect transistor.
The LED power feeding mechanism with light adjusting circuit as described above, wherein, which is a diode.
The LED power feeding mechanism with light adjusting circuit as described above, wherein, the power conversion unit is flyback
Formula power conversion unit, forward type power conversion unit, LLC resonant modes power supply changeover device or push-pull type power conversion unit.
The LED power feeding mechanism with light adjusting circuit as described above, wherein, which is a gold medal oxygen
Half field effect transistor, and the metal-oxide half field effect transistor has a body diode；Wherein, which draws
The constant current source and the filter unit are extremely coupled to, the source terminal of the metal-oxide half field effect transistor is coupled to control light modulation list
Member, and the gate terminal of the metal-oxide half field effect transistor is coupled to the output terminal of the comparator.
Compared with prior art, the beneficial effects of the present invention are：
The light adjusting circuit of the present invention especially has a low level prevention unit, and the one of the low level prevention unit electrically holds
The control dimming unit of light adjusting circuit is coupled to, its another electrically end then couples the constant current source inside light adjusting circuit；In this way, one
Denier user is respectively connected to more than two LED light emission devices with more than two power conversion units and is adjusted with single control
Light unit is come when adjusting the luminosity of those LED light emission devices, which just can be in one of which electricity
When source converting unit damages or the situation of short circuit occurs, the signal level for the dim signal that the control dimming unit exported is prevented
It is pulled downwardly to low level, and then maintains the normal operation for the light adjusting circuit that another group of power conversion unit coordinate with it.
It must be subject to, it is emphasized that above-mentioned detailed description is illustrated for possible embodiments of the present invention, only the embodiment
And be not used to limit the scope of the claims of the present invention, it is all without departing from equivalence enforcement or change carried out by skill spirit of the present invention, it should all include
In this case the scope of the claims.
Brief description of the drawings
Fig. 1 is a kind of existing circuit block diagram for the LED power supply for possessing dimming function；
Fig. 2 is a kind of circuit block diagram of LED power feeding mechanism with light adjusting circuit of the present invention；
Fig. 3 A are the first circuit framework figure of the LED power feeding mechanism with light adjusting circuit；
Fig. 3 B are the second circuit Organization Chart of the LED power feeding mechanism with light adjusting circuit；And
Fig. 4 is the application circuit block diagram of the LED power feeding mechanism with light adjusting circuit.
Primary symbols explanation in figure：
<The present invention>
1：Light adjusting circuit 2：Power conversion unit
Vac：AC power 3：LED light emission device
11：Constant current source 12：Control dimming unit
13：Filter unit 14：Light turns off and driving unit
17：Switch element 18：Low level prevention unit
Icon：Constant current Va：Analog voltage signal
VPWMPWM：Voltage signal Q：Bipolar junction transistors
RE：Emitter resistance Vdd：Operating voltage
VREF：Reference voltage RB：Base resistance
D1：Diode D2：Diode
R1：Filter resistance R2：Filter capacitor
<It is known>
1’：LED power supply 2：First LED light emission device
11’：First power conversion unit 12 '：First driving unit
13’：First signal processing unit
14’：First switching element driving unit
15’：First switch unit
16’：Dim signal generator 1a '：LED power supply
2a’：LED light emission device 11a '：Second source converting unit
12a’：Second driving unit 13a '：Second signal processing unit
14a’：Second switch element driving unit
15a ' second switch units
Embodiment
In order to more clearly describe a kind of light adjusting circuit proposed by the invention and there is the LED electricity of the light adjusting circuit
Source supply device, below in conjunction with schema, elaborates presently preferred embodiments of the present invention.
A kind of referring to Fig. 2, circuit block diagram of LED power feeding mechanism with light adjusting circuit of the present invention；Also,
, should the first circuit framework figure with the LED power feeding mechanism of light adjusting circuit please refer to Fig. 3 A.Such as Fig. 2 and Fig. 3 A institutes
Show, the LED power feeding mechanism with light adjusting circuit of the invention mainly includes：One light adjusting circuit 1 and a power conversion unit
2, wherein, the alternating current which couples an AC power Vac to be exported to AC power Vac carries out
Voltage conversion, and then export a stabilized power source and give an at least LED light emission device 3.The power conversion unit 2 can be flyback
(flyback) power conversion unit, forward type (forward) power conversion unit, LLC resonant modes power supply changeover device or recommend
Formula (push-pull) power conversion unit.In addition, the light adjusting circuit 1 is coupled to the power conversion unit 2 and the LED light emission device 3
Between, to adjust the luminosity of the LED light emission device 3.
Unceasingly include refering to Fig. 2 and Fig. 3 A, the light adjusting circuit 1：One constant current source 11, one controls dimming unit 12, one
Filter unit 13, a light shut-off with 14 and one low level prevention unit 18 of driving unit, wherein the constant current source 11 to
A constant current Icon is produced, and the control dimming unit 12 is coupled to the constant current source 11, and exported after the constant current is received
One dim signal (dimming signal).Also, the filter unit 13 is coupled to control dimming unit 12 to receive the light modulation
Signal, and the dim signal is filtered；Further, light shut-off and the driving unit 14 of the filter unit 13 are coupled to
A driving control signal can be exported after the dim signal after reception is filtered.
Above-mentioned explanation is held, which is coupled to light shut-off and driving unit 14, a power conversion unit 2
With a LED light emission device 3, wherein, light shut-off is driven with the driving control signal and controls the switch with driving unit 14
Unit 17, to make the LED light emission device 3 shine.Especially, the present invention also has a low level prevention unit 18；Such as Fig. 2 and figure
Shown in 3A, which is a diode, and it is single that one elecrtonegativity end (that is, N is extreme) is coupled to control light modulation
Member 12, and one electropositive end (that is, P is extreme) couples the constant current source 11 and the filter unit 13；Wherein, which prevents
Unit 18 is maintaining the signal level of the dim signal.In order to which low level prevention unit 18 of the present invention is explained further
Function, it is necessary to through the LED power feeding mechanism with light adjusting circuit depicted in Fig. 4 application circuit block diagram come it is clear
Explanation.In the application of general LED power feeding mechanism, it will usually change the power supply among LED power feeding mechanism single
Member 2 is connected to LED light emission device 3；Two LED light emission devices 3 are respectively connected to two power conversion units 2 as shown in Figure 4,
And dimming unit 12 is controlled to adjust the luminosity of two LED light emission devices 3 with single.
Above-mentioned explanation is held, however, when one of which power conversion unit 2 is damaged or the situation of short circuit occurs, gesture
It must be inconjunction with to input to the signal level of the dim signal of another group of power conversion unit 2 and be pulled to low level downwards；At this time, it is low
Level prevention unit 18 (that is, diode) will play its function to prevent the signal level of dim signal from being pulled downwardly to low standard
Position, and then maintain the normal of the light adjusting circuit 1 (including the control dimming unit 12) that coordinates with it of another group of power conversion unit 2
Running.When one of which power conversion unit 2 is damaged or the situation of short circuit occurs, constant current that constant current source 11 is exported
Icon just can only be inputted the normal group by the diode and control dimming unit 12, and thereby mode keeps the normal group control
The electric connection of dimming unit 12 processed and constant current source 11 is closed, and is so as to avoiding normal 12 institute of group control dimming unit defeated
The signal level of the dim signal gone out is pulled downwardly to low level.
Please continue to refer to Fig. 3 B, the second circuit Organization Chart of the LED power feeding mechanism with light adjusting circuit.In the present invention
In, in addition to the embodiment aspect for the low level prevention unit 18 that Fig. 3 A are gone out, low level prevention unit 18 can also Fig. 3 B
For a metal-oxide half field effect transistor (Power Metal-Oxide-Semiconductor Field-Effect
Transistor, Power MOSFET), and the metal-oxide half field effect transistor has a body diode (Body diode)；Its
In, the drain end of the metal-oxide half field effect transistor is coupled to the constant current source 11 and the filter unit 13, and the OH is brilliant
The source terminal of body pipe is coupled to the control dimming unit 12, and the gate terminal of the metal-oxide half field effect transistor is coupled to light shut-off
With the output terminal of driving unit 14.So set, when one of which power conversion unit 2 is damaged or the situation of short circuit occurs,
Since the internal body diode of low level prevention unit 18 (metal-oxide half field effect transistor) will play its function, reach prevention
The effect of signal level of dim signal is pulled downwardly to low level, and then maintain another group of power conversion unit 2 to coordinate with it
Light adjusting circuit 1 (including the control dimming unit 12) normal operation.Also, in the case where circuit runs well, low standard
Position prevention unit 18 (metal-oxide half field effect transistor) is a conducting circuit, it hardly causes any pressure drop.
Further, since the present invention is not particularly limited the form of the control dimming unit 12, therefore the control dimming unit
12 can be the group of variable resistor light modulator, direct current light modulator, pulse-width modulation signal light modulator and above-mentioned both above
Close.As shown in Figure 3A, using above the control dimming unit 12 can be used as using direct current light modulator or pulse-width modulation signal light modulator；Its
In, if using direct current light modulator as control dimming unit 12, control dimming unit 12 can be defeated by low level prevention unit 18
Enter magnitude of voltage between 0V and 10V (be usually 1V~10V) an analogy voltage signal Va to back-end circuit.If in addition, with arteries and veins
Width modulation signal light modulator then controls dimming unit 12 to be inputted by low level prevention unit 18 as control dimming unit 12
A pwm signal VPWM of the magnitude of voltage between 12V and 24V is to back-end circuit.In addition, as shown in Figure 3B, also can using upper
Using variable resistor light modulator as the control dimming unit 12, wherein, constant current source 11 is inputted to the constant current of variable resistor
Icon can cause the voltage of 0V~10V in the both ends of the variable resistor, this voltage is just as inputting to back-end circuit
Input voltage.
In this regard, it must be turned off and driving unit 14 to the constant current source 11 of the light adjusting circuit 1, filter unit 13, with light
Embodiment aspect be further described.As shown in Figure 3A, in the present invention, the constant current source 11 is by a bipolar junction crystal
Pipe (Bipolar Junction Transistor, BJT) Q, an emitter resistance RE, a base resistance RB and two are one another in series
Diode (D1, D2) is formed, wherein, bipolar junction transistors Q is coupled to the low level prevention unit with its collector terminal
18 with the filter unit 13.One end of emitter resistance RE is coupled to the emitter-base bandgap grading end of bipolar junction transistors Q, and its is another
End is coupled to an operating voltage Vdd.In addition, one end of base resistance RB is coupled to the base terminal of bipolar junction transistors Q,
And the other end is grounded.Furthermore this two diodes (D1, D2) being one another in series are coupled to emitter resistance RE and the base resistance
Between RB, and operating voltage Vdd is coupled at the same time.
Continue above-mentioned explanation, which is made of a filter resistance R1 and a filter capacitor C1, wherein, should
One end of filter resistance R1 is coupled to the constant current source 11 and the low level prevention unit 18, its other end is then coupled to the light
Shut-off and driving unit 14；Also, one end of filter capacitor C1 is coupled to the other end of filter resistance R1 and the light turns off
With driving unit 14, and its other end be grounded.In addition, light shut-off and driving unit 14 are a comparator, and the comparison utensil
There are one second input terminal and coupling for being coupled to a first input end of a reference voltage VREF, being coupled to the filter unit 13
It is connected to an output terminal of the switch element 17.In circuit running of the light shut-off with driving unit 14, when control dimming unit
When the magnitude of voltage of 12 dim signals inputted is too low, such as：Less than 2V, then comparator is through comparing the dim signal and the ginseng of 2V
After examining voltage VREF, will assert user perform close LED power action, then comparator will output driving with
Control signal is to close the switch element 17, and thereby mode stops shining for the LED light emission device 3.On the contrary, when control light modulation
When the magnitude of voltage for the dim signal that unit 12 is inputted is higher than 2V, then light shut-off just exports high levle letter with driving unit 14
Number to open (Turn on) switch element 17, thereby mode makes shining for the LED light emission device 3.
Above example is only the exemplary embodiment of the present invention, is not used in the limitation present invention, protection scope of the present invention
It is defined by the claims.Those skilled in the art can make the present invention respectively in the essence and protection domain of the present invention
Kind modification or equivalent substitution, this modification or equivalent substitution also should be regarded as being within the scope of the present invention.
Claims (16)
- A kind of 1. light adjusting circuit, it is characterised in that including：One constant current source, to produce a constant current；One control dimming unit, is coupled to the constant current source, and export a dim signal after the constant current is received；One filter unit, is coupled to the control dimming unit to receive the dim signal, and the dim signal is filtered；One light turn off and driving unit, be coupled to the filter unit with receive it is filtered after the dim signal, and then export One driving control signal；Wherein, light shut-off and driving unit be a comparator, and the comparator is with being coupled to a reference One first input end of voltage, one second input terminal and an output terminal for being coupled to the filter unit；One switch element, be coupled to light shut-off with outside the output terminal of driving unit, an external power supply converting unit and one Portion's LED light emission device, wherein, light shut-off is driven with the driving control signal with driving unit and controls the switch element, To make the external LED light-emitting device shine；AndOne low level prevention unit, electrically end is coupled to the control dimming unit to one, and its another electrically end couples the fixed electricity Stream source and the filter unit；Wherein, the low level prevention unit to prevent the signal level of the dim signal be pulled downwardly to Low level.
- 2. light adjusting circuit according to claim 1, it is characterised in that wherein, which includes：One bipolar junction transistors, the low level prevention unit and the filter unit are coupled to its collector terminal；One emitter resistance, its one end is coupled to the emitter-base bandgap grading end of the bipolar junction transistors, and its other end is coupled to a job Voltage；One base resistance, its one end is coupled to the base terminal of the bipolar junction transistors, and the other end is grounded；AndTwo diodes being one another in series, are coupled between the emitter resistance and the base resistance, and couple work electricity at the same time Pressure.
- 3. light adjusting circuit according to claim 1, it is characterised in that wherein, it is variable resistor tune that this, which controls dimming unit, Combination more than both light device, direct current light modulator, pulse-width modulation signal light modulator or above-mentioned.
- 4. light adjusting circuit according to claim 1, it is characterised in that wherein, which includes：One filter resistance, its one end are coupled to the constant current source and the low level prevention unit, its other end is then coupled to the lamp Light turns off and driving unit；AndOne filter capacitor, its one end are coupled to the other end and light shut-off and driving unit, its other end of the filter resistance Then it is grounded.
- 5. light adjusting circuit according to claim 1, it is characterised in that wherein, which is a power-type gold oxygen half Field-effect transistor.
- 6. light adjusting circuit according to claim 1, it is characterised in that wherein, which is a diode.
- 7. light adjusting circuit according to claim 1, it is characterised in that wherein, the power conversion unit is flyback Power conversion unit, forward type power conversion unit, LLC resonant modes power supply changeover device or push-pull type power conversion unit.
- 8. light adjusting circuit according to claim 1, it is characterised in that wherein, which is a gold medal oxygen half Field-effect transistor, and the metal-oxide half field effect transistor has a body diode；Wherein, the drain of the metal-oxide half field effect transistor End is coupled to the constant current source and the filter unit, and the source terminal of the metal-oxide half field effect transistor is coupled to control light modulation list Member, and the gate terminal of the metal-oxide half field effect transistor is coupled to the output terminal of the comparator.
- A kind of 9. LED power feeding mechanism with light adjusting circuit, it is characterised in that including：An at least power conversion unit, one AC power of coupling carry out voltage with the alternating current exported to the AC power and turn Change, and then export a stabilized power source and give an at least LED light emission device；AndOne light adjusting circuit, including：One constant current source, to produce a constant current；One control dimming unit, is coupled to the constant current source, and export a dim signal after the constant current is received；One filter unit, is coupled to the control dimming unit to receive the dim signal, and the dim signal is filtered；One light turn off and driving unit, be coupled to the filter unit with receive it is filtered after the dim signal, and then export One driving control signal；Wherein, light shut-off and driving unit be a comparator, and the comparator is with being coupled to a reference One first input end of voltage, one second input terminal and an output terminal for being coupled to the filter unit；One switch element, is coupled to light shut-off and the output terminal, the power conversion unit and the LED of driving unit shine Device, wherein, light shut-off is driven with the driving control signal with driving unit and controls the switch element, to make the LED Light-emitting device shines；AndOne low level prevention unit, electrically end is coupled to the control dimming unit to one, and its another electrically end couples the fixed electricity Stream source and the filter unit；Wherein, the low level prevention unit to prevent the signal level of the dim signal be pulled downwardly to Low level.
- 10. the LED power feeding mechanism according to claim 9 with light adjusting circuit, it is characterised in that wherein, this is fixed Current source includes：One bipolar junction transistors, the low level prevention unit and the filter unit are coupled to its collector terminal；One emitter resistance, its one end is coupled to the emitter-base bandgap grading end of the bipolar junction transistors, and its other end is coupled to a job Voltage；One base resistance, its one end is coupled to the base terminal of the bipolar junction transistors, and the other end is grounded；AndTwo diodes being one another in series, are coupled between the emitter resistance and the base resistance, and couple work electricity at the same time Pressure.
- 11. the LED power feeding mechanism according to claim 9 with light adjusting circuit, it is characterised in that wherein, the control Dimming unit processed is variable resistor light modulator, direct current light modulator, pulse-width modulation signal light modulator or above-mentioned both above Combination.
- 12. the LED power feeding mechanism according to claim 10 with light adjusting circuit, it is characterised in that wherein, the filter Ripple unit includes：One filter resistance, its one end are coupled to the constant current source and the low level prevention unit, its other end is then coupled to the lamp Light turns off and driving unit；AndOne filter capacitor, its one end are coupled to the other end and light shut-off and driving unit, its other end of the filter resistance Then it is grounded.
- 13. the LED power feeding mechanism according to claim 9 with light adjusting circuit, it is characterised in that wherein, this is opened Pass unit is a power-type metal-oxide half field effect transistor.
- 14. the LED power feeding mechanism according to claim 9 with light adjusting circuit, it is characterised in that wherein, this is low Level prevention unit is a diode.
- 15. the LED power feeding mechanism according to claim 9 with light adjusting circuit, it is characterised in that wherein, described Power conversion unit be flyback power conversion unit, forward type power conversion unit, LLC resonant modes power supply changeover device or push away Pull power conversion unit.
- 16. the LED power feeding mechanism according to claim 12 with light adjusting circuit, it is characterised in that wherein, this is low Level prevention unit is a metal-oxide half field effect transistor, and the metal-oxide half field effect transistor has a body diode；Wherein, should The drain end of metal-oxide half field effect transistor is coupled to the constant current source and the filter unit, the source electrode of the metal-oxide half field effect transistor End is coupled to the control dimming unit, and the gate terminal of the metal-oxide half field effect transistor is coupled to the output terminal of the comparator.
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| CN105282905B true CN105282905B (en) | 2018-04-20 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105960058B (en) * | 2016-06-06 | 2019-01-01 | 明纬(广州)电子有限公司 | Dimming light-emitting diode switch protecting circuit |
| CN113411931B (en) * | 2021-05-06 | 2024-01-26 | 上海奥简微电子科技有限公司 | LED silicon controlled rectifier dimming quick response circuit and LED lighting device |
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| CN105282905A (en) | 2016-01-27 |
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