CN109496018A - A kind of loop current control circuit and controllable silicon dimmer application circuit - Google Patents
A kind of loop current control circuit and controllable silicon dimmer application circuit Download PDFInfo
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- CN109496018A CN109496018A CN201811610945.XA CN201811610945A CN109496018A CN 109496018 A CN109496018 A CN 109496018A CN 201811610945 A CN201811610945 A CN 201811610945A CN 109496018 A CN109496018 A CN 109496018A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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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 present invention provides a kind of loop current control circuits, the circuit can be according to the variation of external voltage, being switched on and off for loop current is arranged, to reach reduction loss, improve the efficiency of LED illumination driving, it avoids frequently being switched on and off in some electrical voltage point simultaneously, to guarantee the reliability of entire circuit.The present invention also provides a kind of controllable silicon dimmer application circuits.
Description
Technical field
The present invention relates to a kind of loop current control circuit and controllable silicon dimmer application circuits.
Background technique
Generally it is suitable for controllable silicon light modulation in application, the essence of light modulator is phase controlling in linear LED illumination driving IC
Device temporary cutting input voltage reduces the power to light source input.Because cutting input current all occurs exchanging each time
In sine wave, they are also referred to as phase-cut dimmer.Therefore it need to be additionally provided the maintenance electric current of controllable silicon light modulation, it can in order to improve
The compatibility of silicon light modulation is controlled, its general magnitude of current is all arranged very greatly, and this partly belongs to additionally consume.
Because LED is different with incandescent lamp, LED provides constant electric current by driving circuit, and ensures suitable power
And voltage, the interaction of they and TRIAC are unpredictable, for example, in the low dimming levels stage, constant current or constant pressure design
LED driver may compensate cut phase part by obtaining more current from power grid --- or the interruption of AC sine wave
So that LED is kept brightness, or causes to flash.
It is easy to wild effect occur because of maintaining electric current insufficient in dimming process in low-load, solution is
A bleeder resistor must be added.This bleeder resistor will at least consume 1-2 watts of power under normal conditions, and this reduces perseverances
The efficiency of current source circuit.As described above, in order to keep silicon-controlled maintenance electric current deficiency, many compatible silicon controlled LED light modulations
System requires additionally to add bleeder resistor, thus increase loss, so that the whole efficiency of LED light adjusting system is all very low,
This just damaged completely the high energy of LED by original intention.
Although LED illumination driver decides whether LED product can dim, the performance of driver is depended primarily on
With the compatibility of light modulator, such as phase controlled light modulator.If dimmed, the design of driver must be able to the tune of matching light modulator
Optical signal.If can judge that this maintains current loop after lamp bead is lighted, then the efficiency of this LED illumination driving can be improved, especially
It is in lamp plate maximum brightness；Generally in linear LED illumination driving IC, current switch is maintained if any setting, is all voltage list
Point changes, therefore when light modulator transfers knob, and when reaching this electrical voltage point, and its current channel can frequently open that will cause circuit negative
Load is even damaged.
Summary of the invention
The present invention is directed to solve one of above-mentioned technical problem at least to a certain extent or at least provide one kind useful quotient
Industry selection.For this purpose, the circuit can be according to external voltage an object of the present invention is to provide a kind of loop current control circuit
Variation, being switched on and off for loop current is arranged, thus reach reduction loss, improve LED illumination driving efficiency, simultaneously
It avoids frequently being switched on and off in some electrical voltage point, to guarantee the reliability of entire circuit.Another object of the present invention
It is to provide a kind of controllable silicon dimmer.
Loop current control circuit according to the present invention, the loop current control circuit include low pressure difference linearity pressure stabilizing
Device, the low pressure difference linear voltage regulator generate the first burning voltage and the second burning voltage, and the voltage value of the first burning voltage
Less than the voltage value of the second burning voltage；Transmission gate, the transmission gate respectively with first burning voltage, the second burning voltage
It is connected；Comparator, the negative input of the comparator are connected with the transmission gate, the electrode input end of the comparator and outer
Portion's voltage is connected；The input terminal of first reverser, first reverser is connected with the output end of the comparator, and described first
Reverser is for exporting the first level signal；Second reverser, the input terminal of second reverser and first reverser
Output end be connected, second reverser is for exporting second electrical level signal, and the second electrical level signal is described first
The inverted signal of level signal, the second electrical level signal and first level signal feed back to the transmission gate, using as institute
State the control signal of transmission gate, wherein when the voltage value of the external voltage is less than the voltage value of first burning voltage, institute
Transmission gate work is stated in first mode；The voltage value of the external voltage changes from small to big and no more than second burning voltage
When voltage value, the transmission gate work is in first mode；When the voltage value of the external voltage is greater than second burning voltage
Voltage value when, transmission gate work is in second mode；When the voltage value of the external voltage is from large to small and not less than institute
When stating the voltage value of the first burning voltage, the transmission gate work is in second mode.
Loop current control circuit according to the present invention, the circuit can be according to the variations of external voltage, circuit electricity is arranged
Stream is switched on and off, to reach reduction loss, improves the efficiency of LED illumination driving, while being avoided in some electrical voltage point frequency
Numerous is switched on and off, to guarantee the reliability of entire circuit.
In addition, above-mentioned loop current control circuit according to the present invention, can also have the following additional technical features:
External power supply is provided between the negative input and output end of the comparator, and the anode of the comparator is defeated
Enter end and output end indirectly.
The transmission gate includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, the first MOS
Pipe is in parallel with second metal-oxide-semiconductor, and the third metal-oxide-semiconductor is in parallel with the 4th metal-oxide-semiconductor, wherein second burning voltage
Be connected between first metal-oxide-semiconductor and second metal-oxide-semiconductor, first burning voltage be connected to the third metal-oxide-semiconductor with
Between 4th metal-oxide-semiconductor.
Second metal-oxide-semiconductor and the third metal-oxide-semiconductor receive first level signal respectively, first metal-oxide-semiconductor with
4th metal-oxide-semiconductor receives the second electrical level signal respectively.
The grid of first metal-oxide-semiconductor receives first level signal, the source electrode of first metal-oxide-semiconductor and described second
The drain electrode of metal-oxide-semiconductor is connected with second burning voltage respectively, the grid of the grid of second metal-oxide-semiconductor and the third metal-oxide-semiconductor
Extremely it is connected and receives first level signal respectively, the drain electrode of the source electrode of the third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor is distinguished
It is connected with first burning voltage, the grid of the 4th metal-oxide-semiconductor receives the second electrical level signal, the 4th metal-oxide-semiconductor
Source electrode and the drain electrode of the third metal-oxide-semiconductor, the source electrode of the second metal-oxide-semiconductor, the first metal-oxide-semiconductor drain electrode respectively with the comparator
Negative input is connected.
When voltage value of the voltage value of the external voltage less than the first burning voltage, first level signal is height
Level, the second electrical level signal are low level, and second burning voltage is connected with the negative input of the comparator.
When the voltage value of the external voltage is greater than the voltage value of the second burning voltage, first level signal is low
Level, the second electrical level signal are high level, and first burning voltage is connected with the negative input of the comparator.
It is described when the voltage value of the external voltage changes from small to big and is not more than the voltage value of second burning voltage
First level signal is high level, and the second electrical level signal is low level, second burning voltage and the comparator
Negative input is connected.
When the voltage value of the external voltage from large to small and be not less than first burning voltage voltage value when, it is described
First level signal is low level, and the second electrical level signal is high level, first burning voltage and the comparator
Negative input is connected.
The present invention also provides a kind of controllable silicon dimmer application circuit, the controllable silicon dimmer application circuit includes upper
State the loop current control circuit of arbitrary structures.
Controllable silicon dimmer application circuit according to the present invention, the controllable silicon dimmer can avoid external voltage a certain
When point or so fluctuation, current channel, which is frequently opened, causes circuit burden even to damage, while increasing circuit and shining in this LED linear
The reliability of bright lamp plate.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the circuit diagram of the loop current control circuit of one embodiment of the present of invention；
Fig. 2 is that the external voltage of one embodiment of the present of invention generates the schematic diagram of hysteresis；
Fig. 3 is the controllable silicon dimmer application circuit of one embodiment of the present of invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Fig. 1 is the circuit diagram of the loop current control circuit of one embodiment of the present of invention；Fig. 2 is a reality of the invention
The external voltage for applying example generates the schematic diagram of hysteresis；Fig. 3 is the circuit diagram of the controllable silicon dimmer of one embodiment of the present of invention.
With reference to Fig. 1-Fig. 3, the present invention provides a kind of loop current control circuit, the loop current control circuit can be applied to a variety of
Field, in one embodiment of the invention, the loop current control circuit are applied in a controllable silicon dimmer, for adjusting
It saves it and maintains electric current.In other embodiments of the invention, the loop current control circuit also can be applied to other field,
It will not repeat them here.
The present invention provides a kind of loop current control circuit, the loop current control circuit includes that low pressure difference linearity is steady
Depressor, transmission gate 20, comparator 30, the first reverser 40 and the second reverser 50.
Low pressure difference linear voltage regulator (Low Dropout Regulators；Abbreviation LDO) it is located at (not shown) inside IC,
It generates first burning voltage and the second burning voltage, the first burning voltage, the second burning voltage be denoted as respectively V1d5_VA,
V1d6_VB, and the voltage value of V1d5_VA is less than the voltage value of V1d6_VB, V1d5_VA, V1d6_VB are respectively as low-voltage, height
The reference point of voltage.
Transmission gate 20 is connected with the first burning voltage V1d5_VA, the second burning voltage V1d6_VB respectively, i.e., and first
Burning voltage V1d5_VA, the second burning voltage V1d6_VB output end be connected with transmission gate 20.
Comparator 30 has negative input (being denoted as Vn), electrode input end (being denoted as Vp) and output end, comparator 30
Negative input Vn is connected with the transmission gate 20, and the electrode input end of comparator 30 is connected with external voltage (being denoted as LD)；I.e.
First burning voltage V1d5_VA, this two-way voltage of the second burning voltage V1d6_VB are negative with comparator 30 after transmission gate 20
Pole input terminal Vn is connected.
The input terminal of first reverser 40 is connected with the output end of comparator 30, and the first reverser is for exporting the first level
Signal, the first level signal are denoted as vdaxl；
The input terminal of second reverser 50 is connected with the output end of the first reverser 40, and the second reverser 50 is for exporting the
Two level signals (are denoted as vdaxln), and the second electrical level signal vdaxln is the inverted signal of the first level signal vdaxl, i.e.,
When the first level signal vdaxl is low level, second electrical level signal vdaxln is high level；As the first level signal vdaxl
When for high level, second electrical level signal vdaxln is low level；High level, low level in the present embodiment refer to that the first level is believed
Number vdaxl is not to high level, low level specific explanations compared with the relative size of second electrical level signal vdaxln.
Second electrical level signal vdaxln and the first level signal vdaxl feed back to transmission gate 20, using as transmission gate
20 control signal, wherein the voltage value of the external voltage LD is less than the voltage value of the first burning voltage V1d5_VA
When, the work of transmission gate 20 is in first mode；The voltage value of the external voltage LD changes from small to big and no more than described second
When the voltage value of burning voltage V1d6_VB, the work of transmission gate 20 is in first mode；When the voltage value of the external voltage LD
When voltage value greater than the second burning voltage V1d6_VB, the work of transmission gate 20 is in second mode；When the external electrical
When pressing the voltage value of LD from large to small and being not less than the voltage value of the first burning voltage V1d5_VA, 20 work of transmission gate
Make in second mode.
The loop current control circuit of the embodiment of the present invention, the circuit can be according to the variations of external voltage LD, to be arranged back
Road electric current is switched on and off, to reach reduction loss, improves the efficiency of LED illumination driving, while avoiding in some voltage
Point is frequently switched on and off, to guarantee the reliability of entire circuit.
In specific implementation, it is provided with external power supply between the negative input Vn and output end of the comparator 30, it should
External power supply is denoted as VCC, and the GND indirectly of the electrode input end Vp of the comparator 30 and output end.
In specific implementation, with reference to Fig. 1, the transmission gate includes the first metal-oxide-semiconductor 21, the second metal-oxide-semiconductor 22, third metal-oxide-semiconductor
23 and the 4th metal-oxide-semiconductor 24, first metal-oxide-semiconductor 21 is in parallel with second metal-oxide-semiconductor 22, the third metal-oxide-semiconductor 23 with it is described
4th metal-oxide-semiconductor 24 is in parallel, wherein the second burning voltage V1d6_VB is connected to first metal-oxide-semiconductor 21 and described second
Between metal-oxide-semiconductor 22, the first burning voltage V1d5_VA be connected to the third metal-oxide-semiconductor 23 and the 4th metal-oxide-semiconductor 24 it
Between, i.e. the voltage signal that the second burning voltage V1d6_VB is generated is transmitted separately to the first metal-oxide-semiconductor 21 and the second metal-oxide-semiconductor 22, and first
The voltage signal that burning voltage V1d5_VA is generated is transmitted separately to third metal-oxide-semiconductor 23 and the 4th metal-oxide-semiconductor 24.
In specific implementation, second metal-oxide-semiconductor 22 receives first level signal with the third metal-oxide-semiconductor 23 respectively
Vdaxl, first metal-oxide-semiconductor 21 and the 4th metal-oxide-semiconductor 24 receive the second electrical level signal vdaxln respectively.
In specific implementation, the grid of first metal-oxide-semiconductor 21 receives the first level signal vdaxl, and described first
The source electrode of metal-oxide-semiconductor 21 is connected with the second burning voltage V1d6_VB respectively with the drain electrode of second metal-oxide-semiconductor 22, and described
The grid of two metal-oxide-semiconductors 22 is connected with the grid of the third metal-oxide-semiconductor 23 and receives the first level signal vdaxl, institute respectively
The source electrode for stating third metal-oxide-semiconductor 23 is connected with the first burning voltage V1d5_VA respectively with the drain electrode of the 4th metal-oxide-semiconductor 24,
The grid of 4th metal-oxide-semiconductor 24 receives the second electrical level signal vdaxln, the source electrode of the 4th metal-oxide-semiconductor 24 and described the
The drain electrode of three metal-oxide-semiconductors 23, the source electrode of the second metal-oxide-semiconductor 22, the drain electrode of the first metal-oxide-semiconductor 21 are defeated with the cathode of the comparator 30 respectively
Enter to hold Vn to be connected.
In one embodiment of the invention, when the voltage value of the external voltage LD is less than the first burning voltage V1d5_
When the voltage value of VA, the first level signal vdaxl is high level, and the second electrical level signal vdaxln is low level, institute
The second burning voltage V1d6_VB is stated to be connected with the negative input Vn of the comparator 30；When the voltage of the external voltage LD
When value is greater than the voltage value of the second burning voltage V1d6_VB, the first level signal vdaxl is low level, second electricity
Ordinary mail vdaxln is high level, and the first burning voltage V1d5_VA is connected with the negative input Vn of the comparator 30；
When the voltage value of the external voltage LD changes from small to big and is not more than the voltage value of the second burning voltage V1d6_VB, institute
Stating the first level signal vdaxl is high level, and the second electrical level signal vdaxln is low level, second burning voltage
V1d6_VB is connected with the cathode Vn input terminal of the comparator 30；When the external voltage LD voltage value from large to small and not
When voltage value less than the first burning voltage V1d5_VA, the first level signal vdaxl is low level, described second
Level signal vdaxln is high level, the negative input Vn phase of the first burning voltage V1d5_VA and the comparator 30
Even.
In specific implementation, it is come from reference to Fig. 2, the first burning voltage V1d5_VA with the second burning voltage V1d6_VB
The two-way stable voltage that low pressure difference linear voltage regulator LDO is generated, the second burning voltage V1d6_VB and the first burning voltage
The difference DELTA V of V1d5_VA be (V1d6_VB-V1d5_VA), the value of Δ V it is undetermined, can be set according to the size of hysteresis depth.
In another embodiment of the present invention, the first level signal vdaxl and second electrical level signal vdaxln are also controllable
Make and export electric current in entire circuit, for example, in circuit voltage from low to high when, if the voltage value of external voltage LD is less than second
When the voltage value of burning voltage V1d6_VB, the first level signal vdaxl, second electrical level signal vdaxln are respectively low electricity at this time
Flat, high level, current channel is opened at this time；When the voltage value of external voltage LD is greater than the voltage of the second burning voltage V1d6_VB
When value, the first level signal vdaxl is inverted with second electrical level signal vdaxln, and the first level signal vdaxl is by low level
It jumps as high level, and second electrical level signal vdaxln is jumped by high level as low level simultaneously, current channel is closed at this time；And
Afterwards in circuit voltage from high to low when, when the voltage value of external voltage LD is down to the voltage value of the first burning voltage V1d5_VA, electricity
Circulation road is opened again.In this way, external voltage LD produces a hysteresis, the voltage value of external voltage LD is avoided the
When the voltage value of one burning voltage V1d5_VA nearby puts fluctuation, current channel is frequently opened and circuit burden is caused even to damage,
The stability of circuit is improved, and then extends the service life of circuit.
In specific implementation, described controllable the present invention also provides a kind of controllable silicon dimmer application circuit with reference to Fig. 3
Silicon dimmer applications circuit includes the loop current control circuit of above structure.In the present embodiment, the controllable silicon dimmer
It is by taking a TRIAC (Traic Dimming) light modulator as an example.
The loop current control circuit of the controllable silicon dimmer is integrated in the chips, in controllable silicon dimmer application electricity
Lu Zhong, circuit need to provide the maintenance electric current of light modulator, otherwise can be very poor to the compatibility of light modulator, and the COMP pin of the chip
(pin 6), which can provide, maintains electric current to pass through, and cooperates the detecting voltage function of external voltage LD pin (pin 1), can have LED light
It is closed after pearl current start and maintains electric current, so that the loss of electric energy is avoided, to provide its power efficiency.
In specific implementation, which can maintain electricity by the size of the resistance value of setting resistance R3 to adjust
The size of stream, to improve the compatibility of light modulator.
It in specific implementation, can be by the intrinsic standoff ratio of resistance R4 and resistance R5 Lai effectively rule dimension when which applies
The electrical voltage point of electric current judgement is held, for cooperating each lamp plate and the perfect of light modulator to arrange in pairs or groups, can therefore greatly improve the simultaneous of light modulator
Capacitive and the power efficiency for effectively promoting lamp plate.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art are not departing from the principle of the present invention and objective
In the case where can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.
Claims (10)
1. a kind of loop current control circuit characterized by comprising
Low pressure difference linear voltage regulator, low pressure difference linear voltage regulator first burning voltage of generation and the second burning voltage, and the
Voltage value of the voltage value of one burning voltage less than the second burning voltage；
Transmission gate, the transmission gate are connected with first burning voltage, the second burning voltage respectively；
Comparator, the negative input of the comparator are connected with the transmission gate, the electrode input end of the comparator and outer
Portion's voltage is connected；
The input terminal of first reverser, first reverser is connected with the output end of the comparator, first reverser
For exporting the first level signal；
Second reverser, the input terminal of second reverser are connected with the output end of first reverser, and described second is anti-
To device for exporting second electrical level signal, and the second electrical level signal is the inverted signal of first level signal, described the
Two level signals and first level signal feed back to the transmission gate, using the control signal as the transmission gate, wherein
When the voltage value of the external voltage is less than the voltage value of first burning voltage, the transmission gate work is in first mode；
When the voltage value of the external voltage changes from small to big and is not more than the voltage value of second burning voltage, the transmission gate work
In first mode；When the voltage value of the external voltage is greater than the voltage value of second burning voltage, the transmission gate work
Make in second mode；When the voltage value of the external voltage is from large to small and not less than the voltage value of first burning voltage
When, the transmission gate work is in second mode.
2. loop current control circuit according to claim 1, which is characterized in that the negative input of the comparator with
Be provided with external power supply between output end, and the electrode input end of the comparator and output end indirectly.
3. loop current control circuit according to claim 1, which is characterized in that the transmission gate include the first metal-oxide-semiconductor,
Second metal-oxide-semiconductor, third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, first metal-oxide-semiconductor is in parallel with second metal-oxide-semiconductor, the 3rd MOS
It manages in parallel with the 4th metal-oxide-semiconductor, wherein second burning voltage is connected to first metal-oxide-semiconductor and second metal-oxide-semiconductor
Between, first burning voltage is connected between the third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor.
4. loop current control circuit according to claim 3, which is characterized in that second metal-oxide-semiconductor and the third
Metal-oxide-semiconductor receives first level signal respectively, and first metal-oxide-semiconductor and the 4th metal-oxide-semiconductor receive the second electrical level letter respectively
Number.
5. loop current control circuit according to claim 4, which is characterized in that the grid of first metal-oxide-semiconductor receives
The drain electrode of first level signal, the source electrode of first metal-oxide-semiconductor and second metal-oxide-semiconductor stablizes electricity with described second respectively
Pressure is connected, and the grid of second metal-oxide-semiconductor is connected with the grid of the third metal-oxide-semiconductor and receives the first level letter respectively
Number, the source electrode of the third metal-oxide-semiconductor is connected with first burning voltage respectively with the drain electrode of the 4th metal-oxide-semiconductor, and described
The grids of four metal-oxide-semiconductors receives the second electrical level signal, the drain electrode of the source electrode and the third metal-oxide-semiconductor of the 4th metal-oxide-semiconductor, the
The drain electrode of the source electrode of two metal-oxide-semiconductors, the first metal-oxide-semiconductor is connected with the negative input of the comparator respectively.
6. loop current control circuit according to claim 1, which is characterized in that when the voltage value of the external voltage is small
When the voltage value of the first burning voltage, first level signal is high level, and the second electrical level signal is low level, institute
The second burning voltage is stated to be connected with the negative input of the comparator.
7. loop current control circuit according to claim 1, which is characterized in that when the voltage value of the external voltage is big
When the voltage value of the second burning voltage, first level signal is low level, and the second electrical level signal is high level, institute
The first burning voltage is stated to be connected with the negative input of the comparator.
8. loop current control circuit according to claim 6, which is characterized in that when the external voltage voltage value by
When the small voltage value to become larger and be not more than second burning voltage, first level signal is high level, second electricity
Ordinary mail number is low level, and second burning voltage is connected with the negative input of the comparator.
9. loop current control circuit according to claim 6, which is characterized in that when the external voltage voltage value by
When becoming smaller greatly and being not less than the voltage value of first burning voltage, first level signal is low level, second electricity
Ordinary mail number is high level, and first burning voltage is connected with the negative input of the comparator.
10. a kind of controllable silicon dimmer application circuit, which is characterized in that including circuit of any of claims 1-9
Current control circuit.
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| CN201811610945.XA CN109496018A (en) | 2018-12-27 | 2018-12-27 | A kind of loop current control circuit and controllable silicon dimmer application circuit |
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| CN201811610945.XA CN109496018A (en) | 2018-12-27 | 2018-12-27 | A kind of loop current control circuit and controllable silicon dimmer application circuit |
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| CN106455216A (en) * | 2016-10-19 | 2017-02-22 | 东南大学 | Silicon controlled rectifier dimming control system for LED brightness adjustment |
| CN106953515A (en) * | 2017-03-23 | 2017-07-14 | 电子科技大学 | A kind of underloading detection circuit of Automatic adjusument driving voltage |
| CN107546982A (en) * | 2017-10-19 | 2018-01-05 | 广州大学 | A kind of two-mode field circuit of PWM/PFM |
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