CN108495408A - Dim trigger circuit and light modulator - Google Patents
Dim trigger circuit and light modulator Download PDFInfo
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- CN108495408A CN108495408A CN201810266931.4A CN201810266931A CN108495408A CN 108495408 A CN108495408 A CN 108495408A CN 201810266931 A CN201810266931 A CN 201810266931A CN 108495408 A CN108495408 A CN 108495408A
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Classifications
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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]
- H05B45/10—Controlling the intensity of the light
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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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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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]
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Abstract
The present invention relates to light modulation trigger circuits, including：Control circuit and constant-current source circuit；Constant-current source circuit includes rectifier bridge, three end controllable switches, rheostat and voltage-stabiliser tube, rectifier bridge has first input end, second input terminal, first output end and second output terminal, the first input end of rectifier bridge is connect with control circuit, second input terminal of rectifier bridge with the first power input for connecting, first output end of rectifier bridge is connect with the first end of three end controllable switches, first output end of rectifier bridge is also connect by biasing resistor with the control terminal of three end controllable switches, the control terminal of three end controllable switches is also connect with the anode of voltage-stabiliser tube, the cathode of voltage-stabiliser tube and the second output terminal of rectifier bridge connect, rheostatic one end is connect with the second end of three end controllable switches, rheostatic adjustable side is connect with second output terminal.Rheostat is no longer loaded directly on alternating current so that is born lower voltage and smaller power on potentiometer, and then is reduced the size of potentiometer, reduces manufacturing cost.
Description
Technical field
The present invention relates to light regulating technology fields, more particularly to light modulation trigger circuit and use above-mentioned light modulation trigger circuit
Light modulator.
Background technology
Traditional potentiometer thyristor regulating photoswitch is changed by potentiometer resistance, and silicon-controlled triggering electricity is adjusted
Pressure, input ac voltage is substantially all to be added on potentiometer, and silicon-controlled in order to trigger, and must just provide enough electricity
Stream, so the power born will be larger.Since existing potentiometer cost is higher, and volume is very huge, is not suitable for
The light modulator requirement of small size.
Invention content
Based on this, it is necessary to it is larger for traditional potentiometer size, cost is higher, provide it is a kind of be suitable for small size,
The light modulation trigger circuit of the potentiometer of low-voltage and the light modulator for using above-mentioned light modulation trigger circuit.
A kind of light modulation trigger circuit, including：Control circuit and constant-current source circuit；The constant-current source circuit include rectifier bridge,
Three end controllable switches, rheostat and voltage-stabiliser tube, the rectifier bridge have first input end, the second input terminal, the first output end
And second output terminal, the first input end of the rectifier bridge are connect with the control circuit, the second input of the rectifier bridge
For being connect with the first power input, the first output end of the rectifier bridge connects with the first end of three end controllable switch at end
It connecing, the first output end of the rectifier bridge is also connect by biasing resistor with the control terminal of three end controllable switch, and described three
The control terminal of controllable switch is held also to be connect with the anode of the voltage-stabiliser tube, the cathode of the voltage-stabiliser tube and the second of the rectifier bridge
Output end connects, and described rheostatic one end is connect with the second end of three end controllable switch, the rheostatic adjustable side
It is connect with the second output terminal；The control circuit includes bidirectional triode thyristor, bidirectional conduction diode and charge and discharge capacitance, institute
The second electrode of bidirectional triode thyristor is stated for connect with the first power input, the first electrode of the bidirectional triode thyristor for
Second source input terminal connects, and the gate pole of the bidirectional triode thyristor passes through the bidirectional conduction diode and the charge and discharge capacitance
First end connects, and the second end of the charge and discharge capacitance with second source input terminal for connecting, the first input of the rectifier bridge
End is connect with the first end of the charge and discharge capacitance and the first input end of the rectifier bridge is for by the charge and discharge capacitance and the
Two power inputs connect.
The light modulation trigger circuit includes first resistor in one of the embodiments, the second input of the rectifier bridge
End is connect with the first resistor and the second input terminal of the rectifier bridge is for defeated by the first resistor and the first power supply
Enter end connection.
The light modulation trigger circuit includes second resistance in one of the embodiments, and the of three end controllable switch
Two ends are connect by the second resistance with the second output terminal of the rectifier bridge.
The constant-current source circuit further includes jumper wire device in one of the embodiments, the jumper wire device have input pole with
And two wire jumper poles, the voltage-stabiliser tube include the first voltage-stabiliser tube and the second voltage-stabiliser tube, the control terminal of three end controllable switch with
The input pole of the jumper wire device connects, and two wire jumper poles are steady with positive and described the second of first voltage-stabiliser tube respectively
The cathode and the second of the rectifier bridge of the anode connection of pressure pipe, the cathode of first voltage-stabiliser tube and second voltage-stabiliser tube
Output end connects.
The constant-current source circuit further includes wire jumper resistance, the control of three end controllable switch in one of the embodiments,
End processed is connect by the wire jumper resistance with the input terminal of the jumper wire device.
The control terminal of three end controllable switch and the anode of first voltage-stabiliser tube connect in one of the embodiments,
It connects.
The control circuit further includes loop resistance in one of the embodiments, one end of the loop resistance and institute
The first input end connection of rectifier bridge is stated, the other end of the loop resistance with second source input terminal for connecting.
The light modulation trigger circuit further includes fuse in one of the embodiments, one end of the fuse and institute
State the second electrode of bidirectional triode thyristor and the second input terminal connection of the rectifier bridge, the other end of the fuse be used for
First power input connects.
The first electrode of the bidirectional triode thyristor is additionally operable to defeated with second source by loading in one of the embodiments,
Enter end connection.
A kind of light modulator includes the light modulation trigger circuit using any of the above-described embodiment.
Above-mentioned light modulation trigger circuit, bidirectional triode thyristor change the brightness regulation for realizing load by the electric current of constant-current source,
In, the electric current of constant-current source is by the voltage change on potentiometer, then the amplification through three end controllable switches, changes two-way controllable
The conducting electric current of silicon realizes the function of adjusting load brightness to change the angle of flow of bidirectional triode thyristor.Due to potentiometer
It is no longer loaded directly on alternating current so that bear lower voltage and smaller power on electric rheostat, and then reduce electricity
The size of position device, reduces manufacturing cost.
Description of the drawings
Fig. 1 is the circuit diagram of the light modulation trigger circuit of an embodiment；
Fig. 2 is the circuit diagram of the light modulation trigger circuit of another embodiment；
Fig. 3 is the circuit diagram of the light modulation trigger circuit of another embodiment；
Fig. 4 is the circuit diagram of the light modulation trigger circuit of another embodiment；
Fig. 5 is the circuit diagram of the light modulation trigger circuit of another embodiment；
Fig. 6 is the circuit diagram of the light modulation trigger circuit of another embodiment；
Fig. 7 is the circuit diagram of the light modulation trigger circuit of another embodiment；
Fig. 8 is the circuit diagram of the light modulation trigger circuit of another embodiment.
Specific implementation mode
To facilitate the understanding of the present invention, below with reference to relevant drawings to invention is more fully described.In attached drawing
Give the better embodiment of the present invention.But the present invention can realize in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
It should be noted that when element is referred to as " being set to " another element, it can be directly on another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not offered as being unique embodiment.
Unless otherwise defined, all of technologies and scientific terms used here by the article and belong to the technical field of the present invention
The normally understood meaning of technical staff is identical.Used term is intended merely to description tool in the description of the invention herein
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more
Any and all combinations of relevant Listed Items.
For example, a kind of light modulation trigger circuit, including：Control circuit and constant-current source circuit；The constant-current source circuit includes whole
Liu Qiao, three end controllable switches, rheostat and voltage-stabiliser tube, the rectifier bridge have first input end, the second input terminal, first defeated
Outlet and second output terminal, the first input end of the rectifier bridge are connect with the control circuit, and the second of the rectifier bridge
Input terminal with the first power input for connecting, the first output end of the rectifier bridge and the first of three end controllable switch
End connection, the first output end of the rectifier bridge are also connect by biasing resistor with the control terminal of three end controllable switch, institute
The control terminal for stating three end controllable switches is also connect with the anode of the voltage-stabiliser tube, the cathode of the voltage-stabiliser tube and the rectifier bridge
Second output terminal connects, and described rheostatic one end is connect with the second end of three end controllable switch, the rheostatic tune
Section end is connect with the second output terminal；The control circuit includes bidirectional triode thyristor, bidirectional conduction diode and charge and discharge
Hold, the second electrode of the bidirectional triode thyristor with the first power input for connecting, the first electrode of the bidirectional triode thyristor
For being connect with second source input terminal, the gate pole of the bidirectional triode thyristor passes through the bidirectional conduction diode and the charge and discharge
The first end of capacitance connects, and the second end of the charge and discharge capacitance with second source input terminal for connecting, and the of the rectifier bridge
One input terminal is connect with the first end of the charge and discharge capacitance and the first input end of the rectifier bridge is used for through the charge and discharge
Appearance is connect with second source input terminal.
Referring to Fig. 1, it is the light modulation trigger circuit 10 of an embodiment, including：Control circuit and constant-current source circuit；It is described
Constant-current source circuit includes rectifier bridge DB1, three end controllable switches, rheostat VR1 and voltage-stabiliser tube Z0, in the present embodiment, three ends
Controllable switch is triode Q1, and the rectifier bridge DB1 has first input end DB11, the second input terminal DB12, the first output end
DB13 and second output terminal DB14, the first input end DB11 of the rectifier bridge DB1 is connect with the control circuit, described whole
The second input terminal DB12 of stream bridge DB1 with the first power input P1 for connecting, the first output end of the rectifier bridge DB1
DB13 is connect with the collector of the triode Q1, and the first output end DB13 of the rectifier bridge DB1 also passes through biasing resistor R2
It is connect with the base stage of the triode Q1, the base stage of the triode is also connect with the anode of the voltage-stabiliser tube, the voltage-stabiliser tube
Cathode connect with the second output terminal of the rectifier bridge, the emitter of one end of the rheostat VR1 and the triode Q1
Connection, the adjustable side of the rheostat VR1 is connect with the second output terminal DB14；The control circuit includes bidirectional triode thyristor
The second electrode T2 of SCR, bidirectional conduction diode DB3 and charge and discharge capacitance C0, the bidirectional triode thyristor SCR are used for and the first electricity
Source input terminal P1 connections, the first electrode T1 of the bidirectional triode thyristor SCR are described double for being connect with second source input terminal P
It is connect to the gate pole of controllable silicon SCR with the first end of the charge and discharge capacitance C0 by the bidirectional conduction diode DB3, it is described to fill
The second end that C0 is held in electric discharge is used to connect with second source input terminal P, the first input end of the rectifier bridge and the charge and discharge
The first end of appearance connects and the first input end of the rectifier bridge is used to connect by the charge and discharge capacitance and second source input terminal
It connects, wherein the first input end DB11 of the rectifier bridge DB1 is also connect with the first end of the charge and discharge capacitance C0.
The control circuit of the bidirectional triode thyristor SCR and bidirectional conduction diode DB3 composition bidirectional triode thyristors SCR, pass through
The angle of flow for changing bidirectional triode thyristor SCR changes the virtual value of load current, realizes the brightness adjustment to load.When it is two-way can
It controls silicon SCR to open, then loads opening, when bidirectional triode thyristor SCR closings, then load closing.By adjusting the resistance of rheostat VR1
Value, you can change the angle of flow of bidirectional triode thyristor SCR, and then change the brightness of load.
By above-mentioned light modulation trigger circuit 10, bidirectional triode thyristor SCR is changed by the electric current of constant-current source realizes the bright of load
Degree is adjusted, wherein the electric current of constant-current source is adjusted by rheostat due to rheostatic pressure drop and the amplification of triode Q1
The conducting electric current that rheostatic resistance value changes bidirectional triode thyristor SCR is saved, to change the angle of flow of bidirectional triode thyristor SCR, in turn
The current effective value for changing load realizes the function of adjusting load brightness.Moreover, because potentiometer is no longer loaded directly into friendship
In galvanic electricity so that bear lower voltage and smaller power on potentiometer, and then reduce the size of potentiometer, reduce system
Cause this.
For the ease of the brightness of compensation load, referring to Fig. 2, the light modulation trigger circuit 10 includes first resistor R0, institute
The second input terminal DB12 of rectifier bridge DB1 is stated for being connect with the first power input P1 by the first resistor R0.It is described
One end of first resistor R0 is connect with the first power input P1 so that voltage is in the rectifier bridge DB1 and the first resistor
A voltage division processing is carried out between R0, i.e., so that the voltage loaded on the rectifier bridge DB1 reduces, it is defeated to avoid the first power supply
Enter to hold the high voltage of P1 to be loaded directly on the rectifier bridge DB1.The other end of the first resistor R0 and the rectifier bridge DB1
The second input terminal DB12 connections so that the first resistor R0 connects with the rectifier bridge DB1, increases constant-current source electricity
The resistance on road, however, the constant-current source circuit is in parallel with the control circuit so that total electricity of the light modulation trigger circuit 10
Resistance reduces, since the voltage of the first power input P1 remains unchanged, so that flowing through the electricity of the light modulation trigger circuit 10
It flows virtual value to increase, i.e., the current effective value flowed out from the first electrode T1 of the bidirectional triode thyristor SCR increases, namely flows through negative
The current effective value of load increases, and realizes the brightness of compensation load.
In order to further be convenient for the brightness of compensation load, referring to Fig. 3, the light modulation trigger circuit 10 includes second resistance
The emitter of R4, the triode Q1 are connect by the second resistance R4 with the second output terminal DB14 of the rectifier bridge DB1.
Since the adjustable side of the rheostat VR1 is connect with the second output terminal DB14 of the rectifier bridge DB1, the rheostat VR1's
One end is also connect with the emitter of the triode Q1 so that the second resistance R4 is connected in parallel on the rheostat VR1, i.e. institute
The one end for stating second resistance R4 is connect with the rheostat VR1 close to one end of the emitter of the triode Q1, and described second
The other end of resistance R4 is connect with the adjustable side of the rheostat VR1, in this way, the adjustable side of the rheostat VR1 is mobile
In the process, the electric current flowed into from the triode Q1 emitters can be made to increase, also allow for flowing into the rectifier bridge DB1 the
The electric current of two output end DB14 increases, and to adjust the angle of flow of the bidirectional triode thyristor SCR, avoids the electric current for flowing through load
Loss.In the present embodiment, the resistance value of the second resistance R4 is 100 kilo-ohms, and the Standard resistance range of the rheostat VR1 is 10
Europe~1 megaohm, when the adjustable side of the rheostat VR1 is moved to close to one end of the emitter of the triode Q1, i.e. institute
The resistance value of rheostat VR1 is stated as 10 Europe, total resistance value of the rheostat VR1 and the resistance is to be less than 10 Europe, at this point, flowing into
The electric current of the second output terminal DB14 of the rectifier bridge DB1 reaches maximum.When the adjustable side of the rheostat VR1 is moved to relatively
When end, i.e., the resistance value of the described rheostat VR1 is maximum, and all-in resistance is still less than 100 kilo-ohms at this time, in this way, the change can be kept
Resistance device VR1 and total resistance value of the resistance are consistently less than 100 kilo-ohms, ensure that flow into the rectifier bridge DB1 second is defeated
The electric current of outlet DB14；In another embodiment, in order to reduce the volume of the rheostat VR1, the rheostat VR1 is miniature
Potentiometer, Standard resistance range are 100 Europe~5 kilo-ohm, and total resistance value of the second resistance R4 and miniature potentiometer remain small
In 5 kilo-ohms so that the electric current for flowing into the second output terminal DB14 of the rectifier bridge DB1 further increases, so that described double
Increase to the angle of flow of controllable silicon SCR, i.e., so that the energization period of load extends.Moreover, because the maximum resistance of miniature potentiometer
Value is 5 kilo-ohms so that the specification of the resistive element of miniature potentiometer is smaller, loads on the voltage on miniature potentiometer and is less than directly
Load and the voltage on 220 volts of alternating current source increase while reducing the voltage and power that miniature potentiometer is born
The angle of flow of the bidirectional triode thyristor SCR, ensure that load has enough brightness, that is, avoid the loss of load brightness,
Compensate for the brightness of load.
For the ease of the normal work of constant-current source circuit described in wire jumper operation, referring to Fig. 4, the constant-current source circuit is also
Including jumper wire device J0, it includes the first voltage-stabiliser tube Z1 that the jumper wire device J0, which has input pole and two wire jumper poles, the voltage-stabiliser tube,
With the second voltage-stabiliser tube Z2, the base stage of the triode Q1 is connect with the input pole of the jumper wire device J0, two wire jumper poles point
It is not connect with the anode of the positive and described second voltage-stabiliser tube Z2 of the first voltage-stabiliser tube Z1, the first voltage-stabiliser tube Z1's is negative
The cathode of pole and the second voltage-stabiliser tube Z2 are connect with the second output terminal DB14 of the rectifier bridge DB1.The jumper wire device J0
Selecting switch of the wire jumper pole as different working environments, the quantity of the wire jumper pole of the jumper wire device J0 can be designed to multiple
Wire jumper pole, for example, determine the quantity of the wire jumper pole of the jumper wire device J0 according to the quantity of the voltage-stabiliser tube, i.e., the described voltage-stabiliser tube with
The wire jumper pole of the jumper wire device J0 corresponds；For another example, the wire jumper pole of the jumper wire device J0 is according to the work of the triode Q1
Frequency determine, due to the working frequency of most electronic instrument it is usual there are two types of, a kind of is 50 hertz of working frequency, another
Kind for 60 hertz of working frequency, for the ease of the explanation of the wire jumper pole of multiple jumper wire device J0 to above-mentioned different capacity,
With the wire jumper extremely example of two different jumper wire device J0, the wire jumper pole includes the first wire jumper pole and the second wire jumper pole, institute
State the first wire jumper extremely 50 hertz of output ports, second wire jumper extremely 60 hertz of output ports, first wire jumper pole with
The anode connection of the first voltage-stabiliser tube Z1, the voltage stabilizing value of the first voltage-stabiliser tube Z1 are 5.1 volts, second wire jumper pole with
The voltage stabilizing value of the anode connection of the second voltage-stabiliser tube Z2, the second voltage-stabiliser tube Z2 is 6.2 volts, the first voltage-stabiliser tube Z1
Cathode and the cathode of the second voltage-stabiliser tube Z2 connect with the second output terminal DB14 of the rectifier bridge DB1, in this way, the jump
Line device J0 can select different working frequencies according to the different triode Q1, the base stage due to the triode Q1 and transmitting
The pressure drop of pole is different, select different voltage-stabiliser tubes during wire jumper, can avoid the identical voltage-stabiliser tube breakdown or
Person ends problem, that is, realizes the normal work of constant-current source circuit during wire jumper.
In order to further be convenient for the normal work of constant-current source circuit described in wire jumper operation, referring to Fig. 5, the constant-current source
Circuit further includes wire jumper resistance R3, the input that the base stage of the triode Q1 passes through the wire jumper resistance R3 and the jumper wire device J0
End connection.When the jumper wire device J0 is during wire jumper, the mutation of electric current can cause burning out for the triode Q1, so
One wire jumper resistance R3 is set between the triode Q1 and the jumper wire device J0, such as the wire jumper resistance R3 is inductance electricity
Resistance is acted on so that the curent change for flowing through the wire jumper resistance R3 is slow, wherein the wire jumper resistance by the induction reactance of resistance
One end of R3 is connect with the base stage of the triode Q1, the input pole of the other end and the jumper wire device J0 of the wire jumper resistance R3
Connection, in this way, inherently generating a sense on inductance it is found that when the electric current on inductance changes according to Lenz's law
Induced current is to stop the variation of electric current, and due to still can finally restore to stabling current, the wire jumper resistance R3 avoids described
The damage of jumper wire device J0 triode Q1 caused by current break during wire jumper, that is, ensure that the normal of the constant-current source
Work.
For the ease of the voltage stabilization on the rheostat VR1, referring to Fig. 6, the base stage of the triode Q1 with it is described
The anode connection of first voltage-stabiliser tube Z1.When the connection of the first wire jumper pole of the jumper wire device J0, the first voltage-stabiliser tube Z1 is just
Although pole is connect with the base stage of the triode Q1, the first voltage-stabiliser tube Z1 is not turned on simultaneously, the voltage-stabiliser tube be finally connected
It is the second voltage-stabiliser tube Z2.Since the second voltage-stabiliser tube Z2 described in the most of the time is in the conduction state, surely in order to avoid described second
The damage that pressure pipe Z2 occurs in use, the first voltage-stabiliser tube Z1 can be played when the second voltage-stabiliser tube Z2 is burnt out
The effect of secondary pressure so that the voltage on the rheostat VR1 is still within a relatively stable voltage.Described first is steady
The voltage stabilizing value of pressure pipe Z1 is 6.2 volts, and value is more than the voltage stabilizing value of the second voltage-stabiliser tube Z2, i.e., the described first voltage-stabiliser tube Z1's
Pressure voltage more than the second voltage-stabiliser tube Z2 pressure voltage namely the first voltage-stabiliser tube Z1 provide a stabilization and voltage compared with
High voltage so that when the jumper wire device J0 jumps to 60 hertz of working frequencies, the rheostat VR1 still can obtain stabilization
Voltage, that is, ensure that the voltage stability on the rheostat VR1.
For the ease of the electric discharge of charge and discharge capacitance C0, referring to Fig. 7, the control circuit further includes loop resistance R1, it is described
One end of loop resistance R1 is connect with the first input end DB11 of the rectifier bridge DB1, and the other end of the loop resistance R1 is used
It is connect in second source input terminal P.One end of the charge and discharge capacitance C0 and the first input end DB11 of the rectifier bridge DB1 connect
It connects, the other end of the charge and discharge capacitance C0 with second source input terminal P for connecting so that the loop resistance R1 is filled with described
It is in parallel that C0 is held in electric discharge.The alternating current of the first input end DB11 of the rectifier bridge DB1 is under the control of the bidirectional triode thyristor SCR
The charge and discharge capacitance C0 is flowed through, when alternating current is in the angle of flow of the bidirectional triode thyristor SCR, the charge and discharge capacitance at this time
C0 charges, and the charge and discharge capacitance C0 charges to the bidirectional conduction diode DB3 conductings so that the bidirectional triode thyristor SCR
Conducting, so that load is lighted.Wherein, the angle of flow of the bidirectional triode thyristor SCR is in the of the bidirectional triode thyristor SCR
It is described two-way when alternating current is in the region other than the angle of flow of the bidirectional triode thyristor SCR in one quadrant and third quadrant
Controllable silicon SCR is ended, and due to also having voltage on the charge and discharge capacitance C0, and the voltage on its capacitance will not be mutated, only
It can be incrementally decreased, in order to enable there are one circuits for the electric discharge of the charge and discharge capacitance C0, that is, the electric discharge for being convenient for charge and discharge to hold C0
Journey, that just there are one electric discharges is negative for charge on the in parallel loop resistance R1 on the charge and discharge capacitance C0, the charge and discharge capacitance C0
It carries so that there are one discharge loops for the electric discharge of the charge and discharge capacitance C0, avoid the charge and discharge capacitance C0 in discharge process
Charge flows into the bidirectional conduction diode DB3 and bidirectional triode thyristor SCR, that is, avoids prolonged charge collision pair
The bidirectional conduction diode DB3 and bidirectional triode thyristor SCR damages；In another embodiment, the charge and discharge capacitance C0
Can also be that two monolithic ceramic capacitors with temperature compensation characteristic are in parallel, resistance value 0.1uf, the loop resistance R1
Resistance value be 1.3 megaohms.
The breakdown of the bidirectional triode thyristor SCR is caused in order to avoid alternating current is excessive, referring to Fig. 8, the light modulation triggers
Circuit 10 further includes fuse FUSE1, the second electrode T2 of one end of the fuse FUSE1 and the bidirectional triode thyristor SCR
And the second input terminal DB12 connections of the rectifier bridge DB1, the other end of the fuse FUSE1 is for defeated with the first power supply
Enter P1 is held to connect.The fuse FUSE1 is installed on the main stream of the light modulation trigger circuit 10, since the first current source is
The voltage peak of 220 volts of alternating current, alternating current can be more than 220 volts, i.e. voltage peak is 311 volts so that alternating current
Electric current can also change.The fuse FUSE1 is when the electric current of alternating current reaches highest, it is possible to prevente effectively from electric current is excessive
The maximum cut-off current of problem, the fuse FUSE1 is 5 amperes, and maximum effective voltage value is 250 volts, in this way, when first
When the electric current of power input P1 is more than 5 ampere-hours, i.e., the described light modulation trigger circuit 10 or load overload, the fuse
FUSE1 can directly fuse so that the fuse FUSE1 disconnects the first power input P1 and the light modulation trigger circuit 10
Connection, and then avoid high current and puncture the bidirectional triode thyristor SCR.
In the present embodiment, the first electrode of the bidirectional triode thyristor is additionally operable to connect by load and second source input terminal
It connects, the first electrode T1 of the bidirectional triode thyristor SCR is used to connect with second source input terminal P by the load, described negative
It includes but is not limited to LED light and motor to carry, and the load is set on the trunk of the light modulation trigger circuit 10, is passed through
The angle of flow of the bidirectional triode thyristor SCR controls the conducting state of the load.
The present invention also provides a kind of light modulators comprising dims trigger circuit described in any of the above-described embodiment.
Above-mentioned light modulation trigger circuit and the light modulator for using light modulation trigger circuit, the bidirectional triode thyristor SCR pass through perseverance
The electric current in stream source changes the brightness regulation for realizing load, wherein the electric current of constant-current source passes through the pressure drop and three on potentiometer
The amplification of pole pipe Q1 changes the conducting electric current of bidirectional triode thyristor SCR, real to change the angle of flow of bidirectional triode thyristor SCR
The function of adjusting load brightness is showed.Since, potentiometer is no longer loaded directly on alternating current, but pass through rectifier bridge DB1's
Rectified action so that bear lower voltage and smaller power on potentiometer, and then reduce the size of potentiometer, reduce
Manufacturing cost.In another embodiment, three end controllable switch further includes field-effect tube, function and the triode Q1 phases
Together, details are not described herein again.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of light modulation trigger circuit, which is characterized in that including：Control circuit and constant-current source circuit；
The constant-current source circuit includes rectifier bridge, three end controllable switches, rheostat and voltage-stabiliser tube, and the rectifier bridge has first
Input terminal, the second input terminal, the first output end and second output terminal, the first input end of the rectifier bridge and control electricity
Road connects, and the second input terminal of the rectifier bridge with the first power input for connecting, the first output end of the rectifier bridge
It is connect with the first end of three end controllable switch, the first output end of the rectifier bridge also passes through biasing resistor and three end
The control terminal of controllable switch connects, and the control terminal of three end controllable switch is also connect with the anode of the voltage-stabiliser tube, described steady
The cathode of pressure pipe is connect with the second output terminal of the rectifier bridge, and the of described rheostatic one end and three end controllable switch
Two ends connect, and the rheostatic adjustable side is connect with the second output terminal；
The control circuit includes bidirectional triode thyristor, bidirectional conduction diode and charge and discharge capacitance, and the of the bidirectional triode thyristor
For being connect with the first power input, the first electrode of the bidirectional triode thyristor is used to connect with second source input terminal two electrodes
It connects, the gate pole of the bidirectional triode thyristor is connect by the bidirectional conduction diode with the first end of the charge and discharge capacitance, described
The second end of charge and discharge capacitance with second source input terminal for connecting, the first input end of the rectifier bridge and the charge and discharge capacitance
First end connection and the rectifier bridge first input end for being connect with second source input terminal by the charge and discharge capacitance.
2. light modulation trigger circuit according to claim 1, which is characterized in that the light modulation trigger circuit includes the first electricity
Resistance, the second input terminal of the rectifier bridge is connect with the first resistor and the second input terminal of the rectifier bridge is for passing through institute
First resistor is stated to connect with the first power input.
3. light modulation trigger circuit according to claim 1, which is characterized in that the light modulation trigger circuit includes the second electricity
Resistance, the second end of three end controllable switch are connect by the second resistance with the second output terminal of the rectifier bridge.
4. light modulation trigger circuit according to claim 1, which is characterized in that the constant-current source circuit further includes jumper wire device,
The jumper wire device has input pole and two wire jumper poles, and the voltage-stabiliser tube includes the first voltage-stabiliser tube and the second voltage-stabiliser tube, described
The control terminal of three end controllable switches is connect with the input pole of the jumper wire device, two wire jumper poles respectively with first voltage stabilizing
The anode connection of positive and described second voltage-stabiliser tube of pipe, the cathode of first voltage-stabiliser tube and second voltage-stabiliser tube
Cathode is connect with the second output terminal of the rectifier bridge.
5. light modulation trigger circuit according to claim 4, which is characterized in that the constant-current source circuit further includes wire jumper electricity
Resistance, the control terminal of three end controllable switch are connect by the wire jumper resistance with the input terminal of the jumper wire device.
6. light modulation trigger circuit according to claim 4, which is characterized in that the control terminal of three end controllable switch and institute
State the anode connection of the first voltage-stabiliser tube.
7. light modulation trigger circuit according to claim 1, which is characterized in that the control circuit further includes loop resistance,
One end of the loop resistance is connect with the first input end of the rectifier bridge, and the other end of the loop resistance is used for and second
Power input connects.
8. light modulation trigger circuit according to claim 1, which is characterized in that the light modulation trigger circuit further includes fusing
Device, one end of the fuse are connect with the second input terminal of the second electrode of the bidirectional triode thyristor and the rectifier bridge,
The other end of the fuse with the first power input for connecting.
9. light modulation trigger circuit according to claim 1, which is characterized in that the first electrode of the bidirectional triode thyristor is also used
It is connect with second source input terminal in by loading.
10. a kind of light modulator, which is characterized in that including any one of claim 1 to 9 light modulation trigger circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810266931.4A CN108495408A (en) | 2018-03-28 | 2018-03-28 | Dim trigger circuit and light modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810266931.4A CN108495408A (en) | 2018-03-28 | 2018-03-28 | Dim trigger circuit and light modulator |
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| CN108495408A true CN108495408A (en) | 2018-09-04 |
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|---|---|---|---|
| CN201810266931.4A Pending CN108495408A (en) | 2018-03-28 | 2018-03-28 | Dim trigger circuit and light modulator |
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Address after: 516007 b1-b3 workshop, No.39 Hechang 6th Road East, Zhongkai high tech Zone, Huizhou City, Guangdong Province Applicant after: Legrand intelligent electric (Huizhou) Co.,Ltd. Address before: 516007 b1-b3 workshop, No.39 Hechang 6th Road East, Zhongkai high tech Zone, Huizhou City, Guangdong Province Applicant before: TCL-LEGRAND INTERNATIONAL ELECTRICAL (HUIZHOU) Co.,Ltd. |