CN105407581B - Dimming circuit, dimming chip, dimming system and dimming method thereof - Google Patents
Dimming circuit, dimming chip, dimming system and dimming method thereof Download PDFInfo
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- CN105407581B CN105407581B CN201510982454.8A CN201510982454A CN105407581B CN 105407581 B CN105407581 B CN 105407581B CN 201510982454 A CN201510982454 A CN 201510982454A CN 105407581 B CN105407581 B CN 105407581B
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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
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
Abstract
The invention discloses a dimming circuit, including a dimming phase detection module, a dimming angle compensation module, an external current control loop, an internal current control loop, a logic control module and a logic response module, wherein dimming phase detection module is used for detecting input voltage, and providing to the dimming angle compensation module; the dimming angle compensation module is connected with the external current control loop and the internal current control loop, and used for outputting a dimming compensation signal to the internal current control loop according to the phase information of the input voltage; the external current control loop outputs an external current signal to the internal current control loop; the internal current control loop is used for outputting a loop control signal to the logic control module according to the dimming compensation signal and the external current signal; the logic control module is used for sending a logic control signal to the logic response module according to the loop control signal; and the logic response module is used for switching on or off the connection between the input voltage and a load.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of light adjusting circuit, light modulation chip, light adjusting system and its light modulation
Method, it is applied to the Buck based on controllable silicon light modulation (blood pressure lowering), the circuit topology of Buckboost (buck) and Flyback
Structure, and the framework on the spot suitable for these topological structure current control loops and floating ground framework.
Background technology
Not only saves energy is dimmed, even more high-quality illumination is necessary, meets different scenes lighting demand.Thyristor regulating is just
The light-dimming method commonly used at present, controllable silicon light modulation mainly realizes pressure regulation or light modulation using phase control method, i.e., in sine
Ripple once for every half controls controlled silicon conducting, obtains the identical angle of flow.By working time (or the phase for changing trigger pulse
Position), thus it is possible to vary angle of flow size, the angle of flow is bigger, and the voltage of dimmer output is higher, and LED is brighter.
However, (85V～135V) is difficult to meet dimming scope in conventional low voltage range application>80% requirement,
Although the topological structure for having controlled by converting power source, for example, it is changed to buck-boost type topology from buck topology.Accordingly, it would be desirable to
Optimized in control technology and application, further to optimize dimming scope so as to reach and meet in low voltage range application
In (85V～135V)>80% even more high.
The content of the invention
In order to solve the above problems, the present invention provides a kind of light adjusting circuit, light modulation chip, light adjusting system and its light modulation side
Method, the phase information of its input voltage for being provided peripheral circuit is expanded to the current control loop of chip internal, so as to root
Correspondingly ON/OFF input voltage and the connection for loading according to logic control signal, and then improve dimming scope and lifting
Systematic function.
According to an aspect of of the present present invention, the present invention provides a kind of light adjusting circuit, and it includes：One light modulation phase detecting module,
One light modulation angle compensation module, a foreign current control loop, an inner-current control loop, a Logic control module and are patrolled
Collect respond module；The light modulation phase detecting module is electrically connected with the light modulation angle compensation module, the light modulation phase-detection
Module is provided to the light modulation angle compensation module to detect the phase information of input voltage；The light modulation angle is mended
Repay module to electrically connect with the foreign current control loop and the inner-current control loop respectively, the light modulation angle compensation
Module exports a light modulation thermal compensation signal to the inner-current control loop to the phase information according to the input voltage；
The foreign current control loop exports a foreign current signal to inner-current control loop；The inner-current control loop
Electrically connect with the Logic control module, the inner-current control loop is to according to the light modulation thermal compensation signal and external electrical
Flow signal and export a corresponding loop control signal to the Logic control module；The Logic control module and the logic
Respond module is electrically connected, and the Logic control module according to the loop control signal to send a logic control signal to institute
State logical response module；The logical response module according to the logic control signal to turn on, so that the input electricity
Pressure is electrically connected with load, or is disconnected according to the logic control signal, so that the input voltage is disconnected with load.
In one embodiment of this invention, the inner-current control loop includes：One comparator, an operational amplifier,
One switch, one first electric capacity and a current mirror；The first input end of wherein described comparator connects one first reference voltage, described
Second input of comparator is respectively electrically connected to the current mirror, one end of first electric capacity, the first of the switch connects
Contact, the outfan of the comparator is electrically connected to the Logic control module；The first input end of the operational amplifier connects
One second reference voltage is connect, the second input of the operational amplifier is electrically connected to the current mirror, the operational amplifier
Outfan be electrically connected to the input of the current mirror；The input of the outfan of the operational amplifier and the current mirror
Electrical connection, the outfan of current mirror first make contact respectively with the switch, one end of first electric capacity and described
The second input electrical connection of comparator, the other end of first electric capacity is electrically connected to common port, first electric capacity and institute
State switch in parallel；The switch is electrically connected to common port, and the second contact point of the switch is electrically connected to the logic control mould
Block.
In one embodiment of this invention, the light modulation phase detecting module includes：One wire or a resistance.
In one embodiment of this invention, the light modulation angle compensation module includes：One first resistor and one second electric capacity,
One end of the first resistor is electrically connected to one end of second electric capacity, and the other end of the first resistor is by dimming phase place
Detection module is electrically connected to the outfan of the rectifier bridge outside, and the other end of second electric capacity is electrically connected to the internal electricity
Flow control loop；The foreign current control loop includes：One second resistance, one end of the second resistance is respectively electrically connected to
The light modulation angle compensation module and inner-current control loop, the other end of the second resistance is electrically connected to public
End.
In one embodiment of this invention, the logical response module includes a field effect transistor, the grid of the field effect transistor
Pole is electrically connected to the Logic control module, and the drain electrode of the field effect transistor is electrically connected to the input voltage, the field effect
The source electrode of pipe is electrically connected to the load.
In one embodiment of this invention, when the voltage of the first electric capacity is equal to or more than first reference voltage, institute
State comparator and export to the loop control signal of the Logic control module and high level is changed into from low level, or when first electric
When the voltage of appearance is less than first reference voltage, the comparator is exported to the circuit controls of the Logic control module to be believed
Number low level is changed into from high level.
In one embodiment of this invention, it is described to patrol when the loop control signal of comparator output is low level
It is high level to collect control module and export to the logic control signal of the logical response module, and control field effect transistor is turned on, while
The Logic control module exports the signal of a signal contrary with the logic control signal to the switch, and the switch is beaten
Open, the inner-current control loop obtains the voltage of the second resistance, and after the amplification of the operational amplifier,
An electric current is produced in the second resistance, and then the current mirror exports a phase induced current to the first electric capacity and to the first electric capacity
Charge.
In one embodiment of this invention, it is described to patrol when the loop control signal of comparator output is high level
It is low level to collect control module and export to the logic control signal of the logical response module, and control field effect transistor is ended, while
The Logic control module exports the signal of a signal contrary with the logic control signal to the switch, and the switch is closed
Close, the first electric capacity electric discharge.
In one embodiment of this invention, the maximum ON time of the field effect transistor is
Wherein R_TON is the second resistance of the foreign current control loop, and R_DIM is the first electric of the light modulation angle compensation module
Resistance, C_DIM is the second electric capacity of the light modulation angle compensation module, and C1 is the first electric capacity of the inner-current control loop,
Vref1 is the first reference voltage, and Vref2 is the second reference voltage, and Vac is the instantaneous value of input voltage.
In one embodiment of this invention, by second resistance, the light modulation of the regulation foreign current control loop
First electric capacity of the first resistor of angle compensation module, the second electric capacity and inner-current control loop is controlling the logical response
The maximum ON time of the field effect transistor of module.
In one embodiment of this invention, when the input voltage increases, the maximum ON time of the field effect transistor
Increase, when the input voltage reduces, the maximum ON time of the field effect transistor reduces.
According to another aspect of the present invention, there is provided one kind light modulation chip, the light modulation chip includes：One internal current is controlled
Loop, a Logic control module and a logical response module；Wherein described inner-current control loop is to according to light modulation chip
One for receiving dims thermal compensation signal and a foreign current signal and exports a corresponding loop control signal to the logic control
Molding block；The Logic control module is electrically connected with the logical response module, and the Logic control module is to according to described
Loop control signal sends a logic control signal to the logical response module；The logical response module is to according to described
Logic control signal and turn on so that the input voltage is electrically connected with load, or broken according to the logic control signal
Open, so that the input voltage is disconnected with load.
In one embodiment of this invention, it is described light modulation chip respectively be arranged at it is described light modulation chip exterior light modulation angle
Degree compensating module and the electrical connection of foreign current control loop, the light modulation angle compensation module is by being arranged at the light modulation chip
The outside light modulation phase detecting module is electrically connected with input voltage, wherein, the light modulation phase detecting module is to detect
The phase information of input voltage, and provide to the light modulation angle compensation module；The light modulation angle compensation module respectively with
The foreign current control loop and the inner-current control loop are electrically connected, and the light modulation angle compensation module is to basis
The phase information of the input voltage and export a light modulation thermal compensation signal to the inner-current control loop；The foreign current
Control loop exports a foreign current signal to inner-current control loop.
In one embodiment of this invention, the light modulation chip also includes：One light modulation phase detecting module, a light modulation angle
Compensating module and a foreign current control loop, wherein, it is described to dim phase detecting module and the light modulation angle compensation module
Electrical connection, the light modulation phase detecting module is provided to the light modulation angle to detect the phase information of input voltage
Compensating module；The light modulation angle compensation module respectively with the foreign current control loop and the inner-current control loop
Electrical connection, the light modulation angle compensation module according to the phase information of the input voltage will export light modulation compensation letter
Number to the inner-current control loop；The foreign current control loop exports a foreign current signal to internal current control
Loop.
In one embodiment of this invention, the maximum ON time of the field effect transistor is
Wherein R_TON is the second resistance of the foreign current control loop, and R_DIM is the first electric of the light modulation angle compensation module
Resistance, C_DIM is the second electric capacity of the light modulation angle compensation module, and C1 is the first electric capacity of the inner-current control loop,
Vref1 is the first reference voltage, and Vref2 is the second reference voltage, and Vac is the instantaneous value of input voltage.
In one embodiment of this invention, by second resistance, the light modulation of the regulation foreign current control loop
First electric capacity of the first resistor of angle compensation module, the second electric capacity and inner-current control loop is controlling the logical response
The maximum ON time of the field effect transistor of module.
According to another aspect of the present invention, there is provided a kind of light adjusting system, it includes a rectifier bridge 120, loads and above-mentioned
Light modulation chip, the rectifier bridge 120 exports an output voltage to the light modulation core alternating current is changed into into unidirectional current
Piece, the light modulation chip correspondingly makes the input voltage electrically connect with load according to internal field effect transistor on or off
Or disconnect, and by adjusting the maximum ON time of field effect transistor, to adjust dimming scope.
According to another aspect of the present invention, the present invention also provides a kind of light-dimming method, using above-mentioned light adjusting circuit, the side
Method is comprised the following steps：A) when light adjusting circuit accesses an input voltage, inner-current control loop obtains the electricity of second resistance
Pressure, and after the amplification of operational amplifier, an electric current is produced in the second resistance, and then current mirror output one is corresponding
Electric current charges to the first electric capacity and to the first electric capacity；B) when the voltage of the first electric capacity is less than the first reference voltage, comparator is defeated
Go out a low level signal to Logic control module, the Logic control module exports the logic control signal of a high level and imitates to field
Ying Guan, while exporting a low level logic control signal to switch so that the field effect transistor conducting, the switch is opened,
So that the current mirror further charges to the first electric capacity；C) when the voltage of the first electric capacity is more than or equal to the first reference voltage
When, comparator exports a high level signal to Logic control module, and the Logic control module exports a low level logic control
Signal processed is to field effect transistor, while exporting the logic control signal of a high level to switch so that the field effect transistor cut-off, institute
Switch closure is stated, so that the electric discharge of the first electric capacity：D) repeat step b) and c), to control to flow through to be electrically connected with the light adjusting circuit
The size of current of the load for connecing.
Description of the drawings
Fig. 1 is the block schematic illustration of the light adjusting circuit in one embodiment of the invention；
Fig. 2 is the circuit connection diagram of the light adjusting circuit in one embodiment of the invention；
Fig. 3 is the block schematic illustration of the light modulation chip in one embodiment of the invention；
Fig. 4 is the connection diagram of the light adjusting system in one embodiment of the invention；
The step of Fig. 5 is the light-dimming method in one embodiment of the invention schematic flow sheet.
Specific embodiment
The tool of the present invention is provided light adjusting circuit, light modulation chip, light adjusting system and its light-dimming method below in conjunction with the accompanying drawings
Body embodiment elaborates.
Shown in Figure 1, according to an aspect of of the present present invention, the present invention provides a kind of light adjusting circuit, and it includes：One light modulation phase
Position detection module 10, a light modulation angle compensation module 20, a foreign current control loop 30, an inner-current control loop 40,
One Logic control module 50 and a logical response module 60.The light modulation phase detecting module 10 and the light modulation angle compensation mould
Block 20 is electrically connected, and the light modulation phase detecting module 10 is provided to the tune to detect the phase information of input voltage
Angular compensating module 20.The light modulation angle compensation module 20 respectively with the foreign current control loop 30 and the inside
Current control loop 40 is electrically connected, and the light modulation angle compensation module 20 is defeated to the phase information according to the input voltage
Go out a light modulation thermal compensation signal to the inner-current control loop 40.The foreign current control loop 30 exports a foreign current
Signal is to inner-current control loop 40.The inner-current control loop 40 is electrically connected with the Logic control module 50, institute
Inner-current control loop 40 is stated to export a corresponding loop according to the light modulation thermal compensation signal and foreign current signal
Control signal is to the Logic control module 50.The Logic control module 50 is electrically connected with the logical response module 60, institute
Logic control module 50 is stated to send a logic control signal to the logical response module according to the loop control signal
60.The logical response module 60 according to the logic control signal to turn on, so that the input voltage and load 70
Electrical connection, or disconnected according to the logic control signal, so that the input voltage is disconnected with load 70.
Shown in Figure 2, in one embodiment of this invention, the inner-current control loop 40 includes：One comparator
Q1, an operational amplifier Q2, a switch K1, an one first electric capacity C1 and current mirror M1.The first of wherein described comparator Q1 is defeated
Enter one first reference voltage V ref1 of end connection, second input of the comparator Q1 be respectively electrically connected to the current mirror M1,
One end of the first electric capacity C1, the first make contact of the switch K1, the outfan of the comparator Q1 is electrically connected to described
Logic control module 50.The first input end of the operational amplifier Q2 connects one second reference voltage V ref2, and the computing is put
Second input of big device Q2 is electrically connected to the current mirror M1, and the outfan of the operational amplifier Q2 is electrically connected to the electricity
The input of stream mirror M1；The outfan of the operational amplifier Q2 is electrically connected with the input of the current mirror M1, the electric current
The outfan of mirror M1 first make contact respectively with the switch K1, one end of the first electric capacity C1 and the comparator Q1's
Second input is electrically connected, and the other end of the first electric capacity C1 is electrically connected to common port, and the first electric capacity C1 is opened with described
Close K1 in parallel.The switch K1 is electrically connected to common port, and second contact point of the switch K1 is electrically connected to the logic control
Module 50.In the present embodiment, common port is earth terminal.
The light modulation phase detecting module 10 includes：One wire or a resistance (not marking in figure).
The light modulation angle compensation module 20 includes：One first resistor R_DIM and one second electric capacity C_DIM, described first
One end of resistance R_DIM is electrically connected to one end of the second electric capacity C_DIM, and the other end of first resistor R_DIM passes through
Light modulation phase detecting module 10 is electrically connected to the outfan of the rectifier bridge 120 (shown in Figure 4) outside, second electric capacity
The other end of C_DIM is electrically connected to the inner-current control loop 40；The foreign current control loop 30 includes：One second
Resistance R_TON, one end of second resistance R_TON is respectively electrically connected to the light modulation angle compensation module 20 and the inside
Current control loop 40, the other end of second resistance R_TON is electrically connected to common port.
The logical response module 60 includes field effect transistor MP, and the grid of field effect transistor MP is electrically connected to described patrolling
Control module 50 is collected, the drain electrode of field effect transistor MP is electrically connected to the input voltage, the source electrode electricity of field effect transistor MP
The load 70 is connected to, the load 70 can be LED load.
Then, according to the design of above-mentioned light adjusting circuit, when the voltage of the first electric capacity C1 is equal to or more than first base
During quasi- voltage Vref1, the comparator Q1 exports loop control signal ONMAX to the Logic control module 50 by low electricity
It is flat to be changed into high level, or when the voltage of the first electric capacity C1 is less than first reference voltage V ref1, the comparator Q1 institutes
Export to the loop control signal ONMAX of the Logic control module 50 and low level is changed into from high level.
When the loop control signal ONMAX of comparator Q1 outputs is low level, the Logic control module 50 is defeated
It is high level to go out to the logic control signal Gate_ON of the logical response module 60, and control field effect transistor MP is turned on, while institute
State the signal contrary with the logic control signal Gate_ON of the output of Logic control module 50 one (for example, signal Gate_OFF,
Now it is low level signal) to the signal of the switch K1, the switch K1 is opened, and the inner-current control loop 40 is obtained
The voltage of second resistance R_TON is taken, and after the amplification of the operational amplifier Q2, in second resistance R_
An electric current is produced on TON, and then the current mirror M1 exports a phase induced current and charges to the first electric capacity C1 and to the first electric capacity C1.
Then, when opening field effect transistor MP when the Logic control module 50 exports high level, timing is just started.As the first electric capacity C1
Voltage be equal to or more than first reference voltage V ref1 when, comparator Q1 output loop control signal ONMAX by low electricity
Flat to become high level, the logic control signal Gate_ON of the output of Logic control module 50 becomes low level by high level, while closing
Close field effect transistor MP.Therefore, loop control signal ONMAX determines the maximum ON time of field effect transistor MP.
In the present embodiment, the maximum ON time of field effect transistor MP is
Wherein R_TON is the second resistance of the foreign current control loop 30, and R_DIM is the of the light modulation angle compensation module 20
One resistance, C_DIM is the second electric capacity of the light modulation angle compensation module 20, and C1 is the of the inner-current control loop 40
One electric capacity C1, Vref1 are the first reference voltage, and Vref2 is the second reference voltage, and Vac is the instantaneous value of input voltage.Therefore,
By adjust second resistance R_TON of the foreign current control loop 30, the light modulation angle compensation module 20 it is first electric
The first electric capacity C1 of R_DIM, the second electric capacity C_DIM and inner-current control loop 40 is hindered to control the logical response module 60
Field effect transistor MP maximum ON time.Furthermore, when the input voltage (such as the Vac shown in Fig. 4) increases,
The maximum ON time increase of field effect transistor MP, when the input voltage reduces, the maximum of field effect transistor MP is led
The logical time reduces.In addition, when foreign current control loop 30 and inner-current control loop 40 disconnect, field effect can be arranged
The acquiescence maximum ON time of pipe MP is Ton_max=10 microseconds.
And when the loop control signal ONMAX of comparator Q1 outputs is high level, the Logic control module 50
It is low level to export to the logic control signal Gate_ON of the logical response module 60, and control field effect transistor MP is ended, while
The Logic control module 50 exports signal (for example, a signal Gate_ contrary with the logic control signal Gate_ON
OFF, now it is high level signal) to the signal of the switch K1, the switch K1 closures, the first electric capacity C1 electric discharges.
It is shown in Figure 3, according to another aspect of the present invention, there is provided one kind light modulation chip 100, the light modulation chip 100
Including：One inner-current control loop 40, a Logic control module 50 and a logical response module 60；Wherein described internal current
Control loop 40 exports a phase to the light modulation thermal compensation signal and the foreign current signal that receive according to light modulation chip 100
The loop control signal ONMAX for answering is to the Logic control module 50；The Logic control module 50 and the logical response mould
Block 60 is electrically connected, and the Logic control module 50 according to the loop control signal ONMAX to send a logic control signal
Gate_ON is to the logical response module 60；The logical response module 60 is to according to the logic control signal Gate_ON
(now its value is " 1 ") and turn on so that the input voltage 70 is electrically connected with load, or according to the logic control signal
Gate_ON (now its value is " 0 ") and disconnect so that the input voltage 70 is disconnected with load.
In the present embodiment, it is described light modulation chip 100 respectively be arranged at it is described light modulation chip 100 outside light modulation angle
Compensating module 20 and foreign current control loop 30 are electrically connected, and the light modulation angle compensation module 20 is by being arranged at the light modulation
The light modulation phase detecting module 10 outside chip 100 is electrically connected with input voltage.Furthermore, the light modulation chip
100 TONMAX ports electrically connect respectively with light modulation angle compensation module 20 and foreign current control loop 30.The light modulation phase
Position detection module 10, the light modulation angle compensation module 20 and the foreign current control loop 30 adopt the shape of discrete component
Formula is connected with the light modulation chip 100, to constitute light adjusting system (as mentioned below).The light modulation phase detecting module 10 is used
To detect the phase information of input voltage, and provide to the light modulation angle compensation module 20.The light modulation angle compensation mould
Block 20 is electrically connected respectively with the foreign current control loop 30 and the inner-current control loop 40, and the light modulation angle is mended
Repay module 20 to export a light modulation thermal compensation signal and control to the internal current to the phase information according to the input voltage
Loop 40.The foreign current control loop 30 exports a foreign current signal to inner-current control loop 40.
And in the other parts embodiment of the present invention, the light modulation phase detecting module 10, the light modulation angle compensation
One or more in module 20 and the foreign current control loop 30 can also be arranged in the light modulation chip 100, its
In, the light modulation phase detecting module 10 is electrically connected with the light modulation angle compensation module 20, the light modulation phase detecting module
10 to detect the phase information of input voltage, and provides to the light modulation angle compensation module 20；The light modulation angle is mended
Repay module 20 to electrically connect with the foreign current control loop 30 and the inner-current control loop 40 respectively, the light modulation angle
Degree compensating module 20 according to the phase information of the input voltage will export a light modulation thermal compensation signal to the internal electricity
Flow control loop 40；The foreign current control loop 30 exports a foreign current signal to inner-current control loop 40.
In addition, the light modulation chip 100 can be with integrated pressure protection module, overcurrent protection module, under-voltage protective module, electricity
(not showing in those module maps) such as stream detection modules, it is referred to as other systems signal input.The Logic control module 50 can
So that corresponding logic control signal Gate_ON is exported according to other systems signal input to the logical response module 60, institute
State logical response module 60 and corresponding action is taken according to the logic control signal Gate_ON.
In the present embodiment, the maximum ON time of field effect transistor MP is
Wherein R_TON is the second resistance of the foreign current control loop 30, and R_DIM is the of the light modulation angle compensation module 20
One resistance, C_DIM is the second electric capacity of the light modulation angle compensation module 20, and C1 is the of the inner-current control loop 40
One electric capacity C1, Vref1 are the first reference voltage, and Vref2 is the second reference voltage, and Vac is the instantaneous value of input voltage.Namely
Say, by adjust second resistance R_TON of the foreign current control loop 30, the light modulation angle compensation module 20 first
First electric capacity C1 of resistance R_DIM, the second electric capacity C_DIM and inner-current control loop 40 is controlling the logical response module
The maximum ON time of 60 field effect transistor MP.Furthermore, when the input voltage increases, field effect transistor MP
Maximum ON time increase, when the input voltage reduces, the maximum ON time of field effect transistor MP reduces.Therefore,
Designed by above-mentioned chip, dimming scope can be improved, but also can be with lift system performance.
Referring to Fig. 4, according to another aspect of the present invention, a kind of light adjusting system is also provided, it includes a rectifier bridge 120, bears
70 and above-mentioned light modulation chip 100 are carried, the rectifier bridge 120 exports an input alternating current is changed into into unidirectional current
Voltage to the light modulation chip 100, the light modulation chip 100 correspondingly make according to the on or off of internal fet MP
The input voltage is electrically connected or disconnected with load 70, and by adjusting the maximum ON time of field effect transistor MP,
To adjust dimming scope.
In the prior art, it is extremely difficult to dimming scope according to Buck blood pressure lowering schemes>80%；And according to Buck-
The framework of Boost remains difficult to reach dimming scope to optimize dimming scope>90%, i.e., cannot meet dimming scope and enter one
The probability of step optimization；Furthermore, in the market increasing area strengthens the requirement to dimming scope, many to require to adjust
Optical range>90%, or even indivedual application requirement dimming scopes>95%, and pass through the above-mentioned design of the present invention, can cause to have
The light adjusting system of light adjusting circuit (or light modulation chip 100) disclosure satisfy that requirement of light regulation, and can effective lift system performance.
Referring to Fig. 5, according to another aspect of the present invention, the present invention also provides a kind of light-dimming method, using above-mentioned light modulation electricity
Road.The structure design description as detailed above of the light adjusting circuit, will not be described here.
The light-dimming method is comprised the following steps：Step S510, when light adjusting circuit access an input voltage when, internal current
Control loop obtains the voltage of second resistance, and after the amplification of operational amplifier, in the second resistance one is produced
Electric current, and then current mirror one phase induced current of output is to the first electric capacity and charges to the first electric capacity；Step S520, when the first electric capacity
When voltage is less than the first reference voltage, comparator exports a low level signal to Logic control module, the Logic control module
The logic control signal of a high level is exported to field effect transistor, while exporting a low level logic control signal to switching, is made
The field effect transistor conducting is obtained, the switch is opened, so that the current mirror charges further to the first electric capacity；Step
S530, when the first electric capacity voltage be more than or equal to the first reference voltage when, comparator export a high level signal to logic control
Module, the Logic control module exports a low level logic control signal to field effect transistor, while exporting a high level
Logic control signal is to switch so that the field effect transistor cut-off, the switch closure, so that the electric discharge of the first electric capacity：Step
Rapid S540, repeat step S520 and step S530, to control to flow through the size of current of the load electrically connected with the light adjusting circuit.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, under the premise without departing from the principles of the invention, can also make some improvements and modifications, and these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (18)
1. a kind of light adjusting circuit, it is characterised in that include：One light modulation phase detecting module, a light modulation angle compensation module, outside one
Portion's current control loop, an inner-current control loop, a Logic control module and a logical response module；
It is described light modulation phase detecting module with it is described light modulation angle compensation module electrically connect, it is described dim phase detecting module to
The phase information of detection input voltage, and provide to the light modulation angle compensation module；
The light modulation angle compensation module is electrically connected respectively with the foreign current control loop and the inner-current control loop
Connect, the light modulation angle compensation module exports a light modulation thermal compensation signal to institute to the phase information according to the input voltage
State inner-current control loop；
The foreign current control loop exports a foreign current signal to inner-current control loop；
The inner-current control loop is electrically connected with the Logic control module, and the inner-current control loop is to basis
It is described to dim thermal compensation signal and foreign current signal and export a corresponding loop control signal to the Logic control module；
The Logic control module is electrically connected with the logical response module, and the Logic control module is to according to the loop
Control signal sends a logic control signal to the logical response module；
The logical response module to be turned on according to the logic control signal so that the input voltage is electrically connected with load
Connect, or disconnected according to the logic control signal, so that the input voltage is disconnected with load.
2. light adjusting circuit according to claim 1, it is characterised in that the inner-current control loop includes：One compares
Device, an operational amplifier, a switch, one first electric capacity and a current mirror；The first input end connection one of wherein described comparator
First reference voltage, the second input of the comparator be respectively electrically connected to the current mirror, one end of first electric capacity,
The first make contact of the switch, the outfan of the comparator is electrically connected to the Logic control module；The operation amplifier
The first input end of device connects one second reference voltage, and the second input of the operational amplifier is electrically connected to the electric current
Mirror, the outfan of the operational amplifier is electrically connected to the input of the current mirror；The outfan of the operational amplifier with
The input electrical connection of the current mirror, the outfan of current mirror first make contact respectively with the switch, described the
The second input electrical connection of one end of one electric capacity and the comparator, the other end of first electric capacity is electrically connected to public
End, first electric capacity and the switch in parallel；The switch is electrically connected to common port, and the second contact point of the switch is electrically connected
It is connected to the Logic control module.
3. light adjusting circuit according to claim 2, it is characterised in that the light modulation phase detecting module includes：One wire
Or a resistance.
4. light adjusting circuit according to claim 3, it is characterised in that the light modulation angle compensation module includes：One first
Resistance and one second electric capacity, one end of the first resistor is electrically connected to one end of second electric capacity, the first resistor
The other end is electrically connected to the outfan of the rectifier bridge outside, the other end of second electric capacity by light modulation phase detecting module
It is electrically connected to the inner-current control loop；The foreign current control loop includes：One second resistance, the second resistance
One end be respectively electrically connected to the light modulation angle compensation module and inner-current control loop, the second resistance it is another
One end is electrically connected to common port.
5. light adjusting circuit according to claim 4, it is characterised in that the logical response module includes a field effect transistor,
The grid of the field effect transistor is electrically connected to the Logic control module, and the drain electrode of the field effect transistor is electrically connected to the input
Voltage, the source electrode of the field effect transistor is electrically connected to the load.
6. light adjusting circuit according to claim 5, it is characterised in that when the voltage of the first electric capacity is equal to or more than described the
During one reference voltage, the comparator is exported to the loop control signal of the Logic control module and is changed into high electricity from low level
It is flat, or when the voltage of the first electric capacity is less than first reference voltage, the comparator is exported to the logic control
The loop control signal of module is changed into low level from high level.
7. light adjusting circuit according to claim 6, it is characterised in that when the loop control signal of comparator output is
During low level, the Logic control module export to the logical response module logic control signal be high level, controlling filed
Effect pipe is turned on, while the Logic control module exports a signal contrary with the logic control signal to the switch
Signal, the switch is opened, and the inner-current control loop obtains the voltage of the second resistance, and through the computing
After the amplification of amplifier, an electric current is produced in the second resistance, and then the current mirror exports a phase induced current to first
Electric capacity simultaneously charges to the first electric capacity.
8. light adjusting circuit according to claim 7, it is characterised in that when the loop control signal of comparator output is
During high level, the Logic control module export to the logical response module logic control signal be low level, controlling filed
Effect pipe ends, while the Logic control module exports a signal contrary with the logic control signal to the switch
Signal, the switch closure, the first electric capacity electric discharge.
9. light adjusting circuit according to claim 5, it is characterised in that the maximum ON time of the field effect transistor isWherein R_TON is the second resistance of the foreign current control loop, and R_DIM is institute
The first resistor of light modulation angle compensation module is stated, C_DIM is the second electric capacity of the light modulation angle compensation module, and C1 is described interior
First electric capacity of portion's current control loop, Vref1 is the first reference voltage, and Vref2 is the second reference voltage, and Vac is input electricity
The instantaneous value of pressure.
10. light adjusting circuit according to claim 9, it is characterised in that by adjusting the foreign current control loop
First electric capacity of second resistance, the first resistor of the light modulation angle compensation module, the second electric capacity and inner-current control loop
To control the maximum ON time of the field effect transistor of the logical response module.
11. light adjusting circuits according to claim 9, it is characterised in that when the input voltage increases, the field effect
The maximum ON time increase of pipe, when the input voltage reduces, the maximum ON time of the field effect transistor reduces.
12. a kind of light modulation chips, it is characterised in that the light modulation chip includes：One inner-current control loop, a logic control
Module and a logical response module；Wherein described inner-current control loop is mended to the light modulation received according to light modulation chip
Repay signal and a foreign current signal and export a corresponding loop control signal to the Logic control module；The logic control
Molding block is electrically connected with the logical response module, and the Logic control module according to the loop control signal to send one
Logic control signal is to the logical response module；The logical response module according to the logic control signal to lead
It is logical so that input voltage is electrically connected with load, or disconnected according to the logic control signal so that the input voltage and
Load is disconnected.
13. light modulation chips according to claim 12, it is characterised in that the light modulation chip respectively be arranged at the tune
Light modulation angle compensation module and foreign current control loop electrical connection outside optical chip, the light modulation angle compensation module passes through
The light modulation phase detecting module for being arranged at the light modulation chip exterior is electrically connected with input voltage, wherein, the light modulation phase
Position detection module is provided to the light modulation angle compensation module to detect the phase information of input voltage；The light modulation
Angle compensation module is electrically connected respectively with the foreign current control loop and the inner-current control loop, the light modulation angle
Degree compensating module exports a light modulation thermal compensation signal to the internal current control to the phase information according to the input voltage
Loop processed；The foreign current control loop exports a foreign current signal to inner-current control loop.
14. light modulation chips according to claim 12, it is characterised in that the light modulation chip also includes：One light modulation phase place
Detection module, a light modulation angle compensation module and a foreign current control loop, wherein, it is described to dim phase detecting module and institute
State light modulation angle compensation module electrical connection, the light modulation phase detecting module to detect the phase information of input voltage, and
There is provided to the light modulation angle compensation module；The light modulation angle compensation module respectively with the foreign current control loop and institute
Inner-current control loop electrical connection is stated, the light modulation angle compensation module is to by according to the phase information of the input voltage
And export one and dim thermal compensation signal to the inner-current control loop；The foreign current control loop exports a foreign current
Signal is to inner-current control loop.
The 15. light modulation chips according to claim 13 or 14, it is characterised in that the maximum ON time of field effect transistor isWherein R_TON is the second resistance of the foreign current control loop, and R_DIM is institute
The first resistor of light modulation angle compensation module is stated, C_DIM is the second electric capacity of the light modulation angle compensation module, and C1 is described interior
First electric capacity of portion's current control loop, Vref1 is the first reference voltage, and Vref2 is the second reference voltage, and Vac is input electricity
The instantaneous value of pressure.
The 16. light modulation chips according to claim 13 or 14, it is characterised in that controlled back by adjusting the foreign current
The first of the second resistance on road, the first resistor of the light modulation angle compensation module, the second electric capacity and inner-current control loop
Electric capacity is controlling the maximum ON time of the field effect transistor of the logical response module.
17. a kind of light adjusting systems, it is characterised in that including the light modulation chip described in a rectifier bridge, load and claim 12, institute
Rectifier bridge is stated alternating current is changed into into unidirectional current, and exports an output voltage to the light modulation chip, the light modulation core
Piece correspondingly makes the input voltage electrically connect or disconnect with load according to internal field effect transistor on or off,
And by the maximum ON time for adjusting field effect transistor, to adjust dimming scope.
18. a kind of light-dimming methods, using the light adjusting circuit described in claim 5, it is characterised in that methods described includes following step
Suddenly：
A) when light adjusting circuit accesses an input voltage, inner-current control loop obtains the voltage of second resistance, and passes through
After the amplification of operational amplifier, an electric current is produced in the second resistance, and then current mirror exports a phase induced current to first
Electric capacity simultaneously charges to the first electric capacity；
B) when the voltage of the first electric capacity is less than the first reference voltage, comparator exports a low level signal to logic control mould
Block, the Logic control module exports the logic control signal of a high level to field effect transistor, while output one is low level patrolling
Control signal is collected to switch so that the field effect transistor conducting, the switch opening, so that the current mirror is further given
First electric capacity charges；
C) when the voltage of the first electric capacity is more than or equal to the first reference voltage, comparator exports a high level signal to logic control
Module, the Logic control module exports a low level logic control signal to field effect transistor, while exporting a high level
Logic control signal is to switch so that the field effect transistor cut-off, the switch closure, so that the electric discharge of the first electric capacity；
D) repeat step b) and c), to control to flow through the size of current of the load electrically connected with the light adjusting circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510982454.8A CN105407581B (en) | 2015-12-24 | 2015-12-24 | Dimming circuit, dimming chip, dimming system and dimming method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510982454.8A CN105407581B (en) | 2015-12-24 | 2015-12-24 | Dimming circuit, dimming chip, dimming system and dimming method thereof |
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| CN105407581B true CN105407581B (en) | 2017-04-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018112905A1 (en) * | 2016-12-23 | 2018-06-28 | 惠州市优科光电科技有限公司 | Led power supply circuit with dimming function |
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| CN205454142U (en) * | 2015-12-24 | 2016-08-10 | 上海晶丰明源半导体有限公司 | Dimmer circuit , chip and dimming system adjust luminance |
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|---|---|---|---|---|
| JPH1187069A (en) * | 1997-09-12 | 1999-03-30 | Marumo Denki Kk | Dimmer |
| CN102299630A (en) * | 2010-06-25 | 2011-12-28 | 电力集成公司 | Power converter with compensation circuit for adjusting output current provided to a constant load |
| CN102665324A (en) * | 2012-04-12 | 2012-09-12 | 上海晶丰明源半导体有限公司 | LED linear driving circuit applicable to thyristor dimmer and control method |
| CN203219540U (en) * | 2013-03-06 | 2013-09-25 | 厦门阳光恩耐照明有限公司 | Circuit having LED light modulation linear compensation |
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