CN206196097U - Lighting device , control chip and linear dimming system - Google Patents
Lighting device , control chip and linear dimming system Download PDFInfo
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- CN206196097U CN206196097U CN201621300929.7U CN201621300929U CN206196097U CN 206196097 U CN206196097 U CN 206196097U CN 201621300929 U CN201621300929 U CN 201621300929U CN 206196097 U CN206196097 U CN 206196097U
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Abstract
The utility model provides a lighting device, control chip and linear dimming system can independently switch string parallel and in order to realize adjusting luminance the purpose, improve the effect of adjusting luminance, the utility model discloses a two segmentation linearities are adjusted luminance, compare the single hop linearity mode of adjusting luminance in the existing market, the utility model discloses the stroke of adjusting luminance is big, the blind spot is little, it is effectual to adjust luminance, overall efficiency is high, compare the multistage linearity mode of adjusting luminance in the existing market, the utility model discloses lamp pearl high -usage, adjust luminance effectual. Simultaneously, compare with the linearity mode of adjusting luminance current in the existing market, the utility model discloses increase the line voltage compensation function, improved the linearity control rate.
Description
Technical field
The utility model is related to lighting technical field, more particularly to a kind of controllable silicon light modulation in field of LED illumination
Series-parallel system can independently be switched and realize two sections of linearity light adjustings and the lighting device with line voltage compensation function, control core
Piece and linearity light adjusting system.
Background technology
Compared with conventional light source, in addition to having the advantages that green, energy-saving and environmental protection, tunable optical is also that its is important to LED illumination
Advantage.Common dimming mode is dimmed comprising simulation, and PWM light modulations, switch on wall is dimmed and controllable silicon light modulation.Wherein, may be used
What control silicon was dimmed is most widely used, and particularly in North America and the Western European countries, almost more than 90% light fixture all uses controllable silicon
Light modulation.Light modulation depth be controllable silicon light modulation light fixture important indicator, represent conduction phase it is smaller when, the minimum LED of flicker free is bright
Degree.Light modulation depth is deeper, and the experience of terminal user is better.
Present market mainstream dimming mode typically using the linearity light adjusting of single hop, but it is present that light modulation stroke is short, dead band is big,
The problem that dimming effect is poor, efficiency is low so that the linearity light adjusting product of existing market, line regulation is poor.It is existing also to adopt
The settling mode dimmed with multistage linear, but its LED lamp bead utilization rate is relatively low, and dimming effect is poor.
Accordingly, it would be desirable to be improved to existing linearity light adjusting mode, improve the linear of existing linearity light adjusting product presence
Regulation is poor, the problem of dimming effect difference.
Utility model content
The purpose of this utility model is that the line regulation existed for existing linearity light adjusting mode is poor, light modulation effect
Really poor problem, there is provided a kind of lighting device, control chip and linearity light adjusting system, realizes that light modulation stroke is big, dead band is small, light modulation
Effect is good, overall efficiency is high, LED lamp bead utilization rate is high.
To achieve the above object, the utility model provides a kind of lighting device, including alternating-current voltage source and alternating voltage
The bus capacitor that the rectification circuit and the rectification circuit of source electrical connection are electrically connected with, the alternating voltage of the alternating-current voltage source
It is input on the bus capacitor by the rectification circuit and obtains busbar voltage；Described device also includes：First controller,
Two controllers, the 3rd controller, the second LED load and the first LED load；First controller is negative with the 2nd LED
Load is connected into tie point, and the second controller and first LED load are connected into the second branch road, the tie point with
Connected with the 3rd controller after second branch circuit parallel connection, first controller is public with second LED load
End is electrically connected with the negative electrode of diode, and the anode of the diode is electrically connected with the second controller and is born with a LED
The common port of load；When busbar voltage is more than or equal to first threshold, the busbar voltage is negative to the 2nd LED by the first controller
Power supply is carried, the busbar voltage is powered by second controller to the first LED load, and the 3rd controller is passively turned on, and is made
Obtain second LED load and the first LED load parallel operation；It is described when busbar voltage is more than or equal to Second Threshold
First controller, second controller do not work, and the 3rd controller starts to first LED load and the 2nd LED
Load supplying, first LED load, the diode, second LED load and the 3rd controller constitute series connection
Circuit so that second LED load and the first LED load tandem working, wherein, the Second Threshold is more than described the
One threshold value.
To achieve the above object, the utility model additionally provides a kind of control chip for linearity light adjusting system, described
Control chip includes：Power supply module and constant flow module；The power supply module, the Drain for receiving the control chip draws
The input voltage to the control chip detected on pin, and it is pre- more than or equal to the power supply module in the input voltage
If start threshold value, generation reference voltage is input into the constant flow module；The constant flow module, for receive the reference voltage with
And the output voltage detected on the CS pins of the reception control chip, and according to the reference voltage and the output voltage
Comparative result generation power tube control signal, the work resistance state of the power tube inside the constant flow module is controlled, so as to control
The size of control chip output current.
To achieve the above object, the utility model additionally provides a kind of linearity light adjusting system, including alternating-current voltage source and institute
State the bus capacitor that the rectification circuit and the rectification circuit of alternating-current voltage source electric connection are electrically connected with, the alternating voltage
The alternating voltage in source is input on the bus capacitor by the rectification circuit and obtains busbar voltage；The system includes using
First control chip of control chip described in the utility model, the second control chip, the 3rd control chip, the first LED load
And second LED load；First control chip, Drain pins are used to receive the busbar voltage, and CS pins pass through first
Resistance is electrically connected to the forward end of second LED load, and the negative end of second LED load is electrical by second resistance
It is connected to the Drain pins of the 3rd control chip；The CS pins of first control chip are further electrically connected with two poles
The negative electrode of pipe, the anode of the diode is electrically connected with the negative end of first LED load；Second control chip,
Drain pins are electrically connected with the negative end of first LED load, and CS pins are electrically connected to described by the second resistance
The Drain pins of the 3rd control chip, the forward end of first LED load is used to receive the busbar voltage；Described 3rd
Control chip, CS pins are grounded by 3rd resistor；First control chip, second control chip and the described 3rd
Control chip detects the input electricity of corresponding control chip by the power supply module being electrically connected on corresponding Drain pins
Pressure, judges that corresponding input voltage is more than or equal to corresponding control chip during the default startup threshold value of power supply module and starts working；Open
The output voltage potential change that the corresponding control chip of beginning work is detected on corresponding resistor by corresponding CS pins is negative anti-
Corresponding constant flow module is fed to, corresponding constant flow module generates power tube control signal, controls the work resistance of corresponding power tube
State, so as to control the size of corresponding control chip output current.
The utility model has the advantage of：The utility model can independently switch series-parallel system to realize dimming purpose,
Improve dimming effect；Two-part linearity light adjusting of the present utility model, compared to single hop linearity light adjusting mode in the market, this reality
With new light modulation stroke it is big, dead band is small, good dimming effect, overall efficiency are high；Dimmed compared to multistage linear in the market
Mode, the utility model lamp bead utilization rate is high, good dimming effect.Meanwhile, with existing linearity light adjusting mode phase in the market
Than the utility model increased line voltage compensation function, improve line regulation, defeated when realizing that input voltage ± 10% fluctuates
Go out current fluctuation scope control in ± 7%, line regulation is better than linearity light adjusting settling mode in the market.
Brief description of the drawings
Fig. 1, the configuration diagram of lighting device described in the utility model；
Fig. 2, the configuration diagram of the embodiment of controller described in the utility model；
Fig. 3, the configuration diagram of the embodiment of control chip described in the utility model；
Fig. 4, the configuration diagram of the embodiment of linearity light adjusting system described in the utility model.
Specific embodiment
Lighting device, control chip and the linearity light adjusting system that the utility model is provided are done specifically below in conjunction with the accompanying drawings
It is bright.
With reference to Fig. 1, the configuration diagram of lighting device described in the utility model.Described lighting device includes：Exchange
What the rectification circuit 11 and the rectification circuit 11 that the voltage source Vin and alternating-current voltage source Vin is electrically connected with were electrically connected with
The alternating voltage of bus capacitor Cin, the alternating-current voltage source Vin is input to the bus capacitor by the rectification circuit 11
Busbar voltage Vbus is obtained on Cin；Described lighting device also includes the first controller U1, second controller U2, the 3rd control
Device U3, the second LED load LED2 and the first LED load LED1.
It is direct current that the rectification circuit 11 is used for the ac voltage rectifier of alternating-current voltage source Vin.Rectification circuit 11 can
Think using four full-bridge rectifiers of diode composition.The output end of rectification circuit 11 can set up a filtration module (in figure
It is not shown), direct current is filtered.
The first controller U1 is connected into tie point, the second controller U2 with the second LED load LED2
The second branch road is connected into the first LED load LED1, with described after the tie point and second branch circuit parallel connection
Three controller U3 connect；The common port of the first controller U1 and the second LED load LED2 is electrically connected with diode DB1
Negative electrode, it is public with the first LED load LED1 that the anode of the diode DB1 is electrically connected with the second controller U2
End.
When busbar voltage Vbus is more than or equal to first threshold VTH1When, the busbar voltage Vbus passes through the first controller U1
Powered to the second LED load LED2, the busbar voltage Vbus is powered by second controller U2 to the first LED load LED1,
The 3rd controller U3 is passively turned on so that the second LED load LED2 works in parallel with the first LED load LED1
Make.When LED2 is with LED1 parallel operations, diode DB1 plays buffer action, isolation tie point and the second branch road, it is to avoid two
Road influences each other.Preferably, diode DB1 two ends are parallel with an isolation resistance R2, are protected with to diode DB1, it is to avoid
Its is breakdown.When the 3rd controller U3 is passively turned on, equivalent to conducting resistance.
When busbar voltage Vbus is more than or equal to Second Threshold VTH2When, the first controller U1, second controller U2 not work
Make, the 3rd controller U3 starts to be powered to the first LED load LED1 and the second LED load LED2, described the
One LED load LED1, the diode DB1, the second LED load LED2 and the 3rd controller U3 constitute series electrical
Road so that the second LED load LED2 and the first LED load LED1 tandem workings.Wherein, the Second Threshold is more than
The first threshold：VTH2>VTH1。
Specifically, the input of the first controller U1 is used to receive with the forward end of the first LED load LED1
The busbar voltage Vbus；The output end of the first controller U1 is coupled to the forward end of the second LED load LED2；Institute
The negative end for stating the first LED load LED1 is electrically connected with the input of the second controller U2；The second LED load LED2
Negative end the input of the 3rd controller U3 is coupled to the output end of the second controller U2；3rd control
The output end of device U3 is coupled to ground.
The input of the first controller U1 detects the busbar voltage Vbus, when the busbar voltage Vbus more than etc.
In first threshold VTH1When (Vbus >=VTH1), it is negative to the 2nd LED that the first controller U1 turns on its built-in power tube
LED2 is carried to power.The input of the second controller U2 detects the busbar voltage by the first LED load LED1
Vbus, when the busbar voltage Vbus is more than or equal to first threshold VTH1When, the second controller U2 turns on its built-in power
Pipe is powered LED1 to first LED load.The input of the 3rd controller U3 detects described by second branch road
Busbar voltage Vbus, when the busbar voltage Vbus is more than or equal to first threshold VTH1When, the 3rd controller U3 is passively turned on
(equivalent to conducting resistance) so that the second LED load LED2 and the first LED load LED1 parallel operations.
Specifically, the input of the first controller U1 is used to receive with the forward end of the first LED load LED1
The busbar voltage Vbus；The output end U1 of first controller is electrically connected with the 2nd LED and bears by first resistor R3
The forward end of LED2 is carried, while being electrically connected with the negative end of the first LED load LED1 by the diode DB1；It is described
The negative end of the first LED load LED1 is further electrically connected with the input of the second controller U2；Second LED load
The negative end of LED2 is electrically connected with the 3rd controller U3 with the output end of the second controller U2 by second resistance R5
Input；The output end of the 3rd controller U3 is grounded by 3rd resistor R6.
The first controller U1 further detects the busbar voltage Vbus by the first resistor R3, as the mother
Line Vbus voltages are more than or equal to Second Threshold VTH2When (Vbus >=VTH2), the first controller U1 turns off its built-in power tube
Stop being powered to the second LED load LED2.The second controller U2 further detects institute by the second resistance R5
Busbar voltage Vbus is stated, when the busbar voltage Vbus is more than or equal to Second Threshold VTH2When, the second controller U2 turns off it
Built-in power pipe stops being powered to the first LED load LED1.The 3rd controller U3 is further by the described 3rd electricity
Resistance R6 detects the busbar voltage Vbus, when the busbar voltage Vbus is more than or equal to the Second Threshold VTH2When, the described 3rd
Controller U3 turns on its built-in power tube and is powered to the first LED load LED1, the second LED load LED2 so that second
LED load LED2 and the first LED load LED1 tandem workings.
Optionally, first controller, second controller, the 3rd controller are constant current drive control device.
In the utility model, the structure of first controller, second controller and the 3rd controller is identical.
With reference to the configuration diagram that Fig. 2 is the embodiment of controller described in the utility model.The controller includes：For
Electric module 21 and constant flow module 22.
The power supply module 21, for receiving the input voltage to corresponding controllers, and be more than in the input voltage etc.
When the default startup threshold value of the power supply module 21, generation reference voltage Vref is input into the constant flow module 22.For first
Controller, second controller, the reception of its power supply module 21 are busbar voltage to the input voltage of corresponding controllers；For
Three controllers, the reception of its power supply module 21 is second controller and the first LED load to the input voltage of corresponding controllers
The voltage on the second branch road being connected into.
Specifically, the power supply module 21 includes：JFET power supply units 211 and reference voltage unit 212.The JFET
Power supply unit 211 is for receiving input voltage and pre- more than or equal to the JFET power supply units 211 in the input voltage
If start threshold value, one supply voltage Vdd of output to the reference voltage unit 212.The reference voltage unit 212, is used for
Reference voltage Vref is generated according to the supply voltage Vdd and is input into the constant flow module 22.
The constant flow module 22, for receiving the reference voltage Vref and that corresponding controllers output end is detected is defeated
Go out voltage Vcs, and power tube control letter is generated according to the comparative result of the reference voltage Vref and the output voltage Vcs
Number, the work resistance state of its internal power tube is controlled, so as to control the size of corresponding controllers output current.For first,
2nd, the 3rd controller, output voltage Vcs is corresponding controllers by the resistance (electricity consumption in Fig. 2 that is electrically connected with its output end
Resistance Rcs illustrate) acquired in voltage.
Specifically, the constant flow module 22 includes：Operational amplifier EA and power tube MP.Operational amplifier EA, it is positive
Input is used to receive reference voltage Vref, and reverse input end is used to receive the output voltage Vcs, and output end is coupled to power
The control end of pipe MP.Preferably, the output end of operational amplifier EA is electrically connected with by logic drive circuit (not shown)
The grid of power tube MP.Power tube MP, drains for receiving input voltage, and source electrode is used to receive output voltage Vcs, grid coupling
To the output end of operational amplifier EA.Operational amplifier EA is according to the reference voltage Vref and the ratio of the output voltage Vcs
Relatively result generates power tube control signal, the work resistance state of control corresponding power pipe MP, so as to control corresponding controllers to export electricity
The size of stream.For example, the corresponding equivalent resistance of work resistance state of control power tube MP is larger, then the output current of controller drops
It is low；Conversely, then the output current of controller is raised；And when the corresponding equivalent resistance deflection of the work resistance state of control power tube MP is high
During resistance state, the output of controller no current.
Preferably, the 3rd controller U3 is further included：Line voltage compensation module 23.The line voltage compensation module 23,
For receiving external compensation electric current, and corresponding offset voltage is generated according to the external compensation electric current, with to being input into the perseverance
The reference voltage Vref of flow module 22 is compensated, so that output current keeps constant.In order to improve the suitable of controller
Include line voltage compensation module 23 with the controller of property first, second controller, the 3rd controller；And for being illuminated shown in Fig. 1
Device, the input of the only line voltage compensation module 23 of the 3rd controller is electrically connected with its input by the 4th resistance R7, with
The reference voltage to being input into the constant flow module 22 of the 3rd controller U3 is compensated, so that the 3rd controller U3 output electricity
Stream keeps constant.
Specifically, the line voltage compensation module 23 includes；Current mirror mirror image unit 231 and partial pressure unit 232.The electricity
Stream mirror mirror image unit 231, for receiving the external compensation electric current by the 4th resistance R7 (illustrating with resistance RD in figure), passes through
Exported to the partial pressure unit 232 after the mirror image of current mirror mirror image unit 231.The partial pressure unit 232, passes through for receiving
External compensation electric current after mirror image, and by generating corresponding offset voltage after the partial pressure of partial pressure unit 232, with to being input into the perseverance
The reference voltage Vref of flow module 22 is compensated.
In the present embodiment, the current mirror mirror image unit 231 includes the first metal-oxide-semiconductor MN1 and the second metal-oxide-semiconductor of common gate
The source grounding of MN2, the first metal-oxide-semiconductor MN1 and the second metal-oxide-semiconductor MN2, the drain electrode of the first metal-oxide-semiconductor MN1 is used for
The external compensation electric current is received by the 4th resistance R7, the drain electrode of the second metal-oxide-semiconductor MN2 is used as current mirror mirror image unit
231 output end, the external compensation electric current by after the mirror image of current mirror mirror image unit 231 from the second metal-oxide-semiconductor MN2
Drain electrode output.The partial pressure unit 232 includes the first divider resistance R21, the second divider resistance R2 that are sequentially connected in series and the
Three divider resistance R23；One end of the first divider resistance R21 is electrically connected with the output end of the power supply module 21, and described the
The common port of one divider resistance R21 and the second divider resistance R22 is electrically connected with the output of the current mirror mirror image unit 231
End；The common port of the second divider resistance R22 and the 3rd divider resistance R23 as partial pressure unit 232 output end, institute
State the other end ground connection of the 3rd divider resistance R22；External compensation electric current after mirror image after the partial pressure of partial pressure unit 232 by generating phase
The offset voltage answered, exports, with to input from the common port of the second divider resistance R22 and the 3rd divider resistance R23
The reference voltage Vref of the constant flow module 22 is compensated.
Lighting device described in the utility model, when busbar voltage is more than or equal to first threshold, is realized by controller
Two string LED lamp bead parallel operations, and constant current effect realized by controller U1, U2 respectively.When input voltage is more than or equal to second
During threshold value, automatically switched by controller and realize two string LED lamp bead tandem workings, constant current effect is realized by controller U3.
That is, the utility model can independently switch series-parallel system to realize dimming purpose, improve dimming effect；Of the present utility model two
Segmentation linearity light adjusting, compared to single hop linearity light adjusting mode in the market, the utility model light modulation stroke is big, dead band is small, tune
Light effect is good, overall efficiency is high；Compared to multistage linear dimming mode in the market, the utility model lamp bead utilization rate
High, good dimming effect.Meanwhile, compared with existing linearity light adjusting mode in the market, the utility model increased line voltage
Compensation function, improves line regulation, and when realizing that input voltage ± 10% fluctuates, output current fluctuation scope control is ± 7%
Interior, line regulation is better than linearity light adjusting settling mode in the market.
With reference to Fig. 3, the configuration diagram of the embodiment of control chip described in the utility model.Described control chip is used
In linearity light adjusting system, including：Power supply module 31 and constant flow module 32.
The power supply module 31, for being detected on the Drain pins for receiving the control chip to the control core
The input voltage of piece, and in default startup threshold value of the input voltage more than or equal to the power supply module 31, generation reference
Constant flow module 22 described in control source.The particular circuit configurations and working method of the power supply module 31 refer to Fig. 2 and its
Corresponding description, here is omitted.
The constant flow module 32, for being detected on the CS pins for receiving the reference voltage and the reception control chip
The output voltage for arriving, and power tube control signal is generated according to the reference voltage and with the comparative result of the output voltage,
The work resistance state of the power tube inside the constant flow module 32 is controlled, so as to control the size of control chip output current.It is described
The particular circuit configurations and working method of constant flow module 32 refer to Fig. 2 and its corresponding description, and here is omitted.
Preferably, the control chip is further included：Line voltage compensation module 33；The line voltage compensation module 33,
For the external compensation electric current detected on the VD pins for receiving the control chip, and generated according to the external compensation electric current
Corresponding offset voltage, compensates, with to the reference voltage for being input into the constant flow module 32 so that control chip is defeated
Go out electric current and keep constant.Wherein, the VD pins of control chip are electrically connected to its Drain pin by external sense resistor RD,
To detect external compensation electric current.The particular circuit configurations and working method of the line voltage compensation module 33 refer to Fig. 2 and
Its corresponding description, here is omitted.
With reference to Fig. 4, the configuration diagram of the embodiment of linearity light adjusting system described in the utility model.The linearity light adjusting
System includes：Rectification circuit 41 and the rectification circuit that the alternating-current voltage source Vin and alternating-current voltage source Vin is electrically connected with
The alternating voltage of 41 the bus capacitor Cin, the alternating-current voltage source Vin being electrically connected with is input to institute by the rectification circuit 41
State and busbar voltage Vbus is obtained on bus capacitor Cin；Wherein, can also be set between alternating-current voltage source Vin and rectification circuit 41
One fuse resistance R0, to play a part of protection circuit.Described system also includes the first control chip U1, the second control core
Piece U2, the 3rd control chip U3, the second LED load LED2 and the first LED load LED1.Wherein, the first control chip U1,
Two control chip U2, the 3rd control chip U3 use control chip shown in Fig. 3.
First the control chip U1, Drain pin (D1, D2) are used to receive the busbar voltage Vbus, CS pins
(CS1, CS2) is electrically connected to the forward end of the second LED load LED2, second LED load by first resistor R3
The negative end of LED2 is electrically connected to the Drain pins (D1, D2) of the 3rd control chip U3 by second resistance R5；It is described
The CS pins (CS1, CS2) of the first control chip U1 are further electrically connected with the negative electrode of diode DB1, the diode DB1's
Anode is electrically connected with the negative end of the first LED load LED1.Second control chip U2, Drain pin (D1, D2) electricity
Property connection the first LED load LED1 negative end, described in CS pins (CS1, CS2) are electrically connected to by second resistance R5
The Drain pins (D1, D2) of the 3rd control chip U3, the forward end of the first LED load LED1 is used to receive the bus
Voltage Vbus.The 3rd control chip U3, CS pins (CS1, CS2) are grounded by 3rd resistor.Preferably, described second
A protective resistance R8 is further in series between the negative end and second resistance R5 of LED load LED2, is carried out with to tie point
Protection.
Preferably, the first LED load LED1 two ends are parallel with the resistance R1 and electric capacity C1 of parallel connection, to remove the line of LED1
Ripple；Second LED load LED2 two ends are parallel with the resistance R4 and electric capacity C4 of parallel connection, to remove the ripple of LED2.Preferably, two
Pole pipe DB1 two ends are parallel with an isolation resistance R2, are protected with to diode DB1, it is to avoid its is breakdown.
The first control chip U1, the second control chip U2 and the 3rd control chip U3 are by electrical
The power supply module (module as shown in label 31 in Fig. 3) being connected on corresponding Drain pins detects the defeated of corresponding control chip
Enter voltage, corresponding control chip starts work when judging that corresponding input voltage is more than or equal to the default startup threshold value of power supply module
Make；The corresponding control chip started working detects the output voltage potential change on corresponding resistor by corresponding CS pins
Negative-feedback to corresponding constant flow module (module as shown in label 32 in Fig. 3), corresponding constant flow module generation power tube control is believed
Number, the work resistance state of corresponding power tube is controlled, so as to control the size of corresponding control chip output current.
Specifically, when the busbar voltage Vbus is more than or equal to first threshold VTH1When, the first control chip U1 and
The second control chip U2 judges default startup threshold value of the input voltage more than or equal to its power supply module, the first control core
Piece U1 and the second control chip U2 starts working；The 3rd control chip U3 judges that input voltage is less than its power supply module
Default startup threshold value, the 3rd control chip U3 passively turns on (equivalent to conducting resistance)；The busbar voltage Vbus leads to
Cross the first control chip U1 to be powered to the second LED load LED2, the busbar voltage Vbus is controlled by described second
Coremaking piece U2 powers to the first LED load LED1 so that the first LED load LED1 and second LED load
LED2 parallel operations.
The output voltage current potential on the first resistor R1 that the CS pins of the first control chip U1 are detected is by mother
The constant flow module for changing negative-feedback to first control chip that line voltage change causes, the perseverance of the first control chip U1
Flow module generates power tube control signal, controls the work resistance of the power tube inside the constant flow module of the first control chip U1
State, for the second LED load LED2 provides constant output current.What the CS pins of the second control chip U2 were detected
Output voltage current potential on the second resistance R2 changes the change negative-feedback for causing to the described second control core by busbar voltage
The constant flow module of piece U2, the constant flow module generation power tube control signal of the second control chip U2, controls second control
The work resistance state of the power tube inside the constant flow module of coremaking piece U2, for the first LED load LED1 provides constant output
Electric current.
Specifically, when busbar voltage Vbus is more than or equal to Second Threshold VTH2When, the first control chip U1 is turned off in it
The power tube put stops being powered to the second LED load LED2, the second control chip U2 turns off its built-in power tube
Stop being powered to the first LED load LED1；The 3rd control chip U3 judges input voltage more than or equal to its power supply mould
The default startup threshold value of block, the 3rd control chip U3 starts to the first LED load LED1 and second LED load
LED2 powers so that the first LED load LED1 and the second LED load LED2 tandem workings；Wherein, second threshold
Value is more than the first threshold：VTH2>VTH1.On the 3rd resistor R6 that the CS pins of the 3rd control chip U3 are detected
Output voltage by the busbar voltage potential change negative-feedback that causes of change to the 3rd control chip U3 constant flow module, institute
The constant flow module generation power tube control signal of the 3rd control chip U3 is stated, the constant flow module of the 3rd control chip U3 is controlled
The work resistance state of internal power tube, for the first LED load LED1 and the second LED load LED2 provide constant output electricity
Stream.
Preferably, the VD pins (VD1, VD2) of the 3rd control chip U3 are electrically connected with described by the 4th resistance R7
The Drain pins (D1, D2) of the 3rd control chip U3, the 3rd control chip U3 further includes line voltage compensation module
(module as shown in label 33 in Fig. 3)；It is described when the first LED load LED1 and the second LED load LED2 connects
Line voltage compensation module receives the outside detected by the 4th resistance R7 on the VD pins of the 3rd control chip U3
Compensation electric current, and corresponding offset voltage is generated according to the external compensation electric current, with to being input into the 3rd control chip U3
The reference voltage of constant flow module compensate so that the 3rd control chip U3 obtains output current and keeps constant.Preferably, institute
The VD pins (VD1, VD2) for stating the 3rd control chip U3 are further grounded by filter capacitor C7；To prevent the 3rd control chip
The error detection of the line voltage compensation module of U3.
The operation principle of system shown in Figure 4 is：
When busbar voltage is more than or equal to first threshold, control chip U1, U2 start working so that LED1 is in parallel with LED2
Work.Control chip U1 detects that busbar voltage changes by internal power supply module, determines control U1 actives；Inside U1
Constant flow module controls the working condition of its internal metal-oxide-semiconductor, so as to provide constant electric current to LED2, makes its work.Similarly, this
When control chip U2 voltage change on LED1 is detected by internal power supply module, control LED1 constant current operations.Now control
It is less than normal that chip U3 detects voltage on its Drain pin by power supply module, in passive working condition, to circuit without contribution.
(Second Threshold is more than the first threshold), control chip U1, U2 when busbar voltage is more than or equal to Second Threshold
CS pins become big by current potential in corresponding resistance detection to corresponding LED, by the constant current inside negative-feedback to control chip
Module, the metal-oxide-semiconductor working condition deflection high-impedance state region in constant flow module decision U1, U2 inside constant flow module, now U1, U2 are opened
Begin to be in passive working condition, hardly in output current.Meanwhile, control chip U3 detects it by internal power supply module
Voltage becomes big (voltage in the LED load connected becomes big) on Drain pins, starts active；Now LED1 and LED2
In series model.Constant flow module inside U3 determines the working condition of metal-oxide-semiconductor, for the LED load of series connection provides constant work
Make electric current.
Under LED1 and the normal tandem working states of LED2, the line voltage compensation module inside control chip U3 is by outside
Detection resistance can detect the voltage change in the LED load of series connection, obtain thermal compensation signal, the ginseng for being received to constant flow module in real time
Examine voltage to compensate, adjust the work resistance state of metal-oxide-semiconductor, realize that output current keeps constant.
Linearity light adjusting system described in the utility model, when busbar voltage is more than or equal to first threshold, by controlling core
Piece realizes two string LED lamp bead parallel operations, and by control chip U1, U2 realizes constant current effect respectively.When input voltage is more than
During equal to Second Threshold, automatically switched by control chip and realize two string LED lamp bead tandem workings, realized by control chip U3
Constant current effect.That is, the utility model can independently switch series-parallel system to realize dimming purpose, improve dimming effect；This
The two-part linearity light adjusting of utility model, compared to single hop linearity light adjusting mode in the market, the utility model light modulation stroke
Greatly, dead band is small, good dimming effect, overall efficiency are high；Compared to multistage linear dimming mode in the market, the utility model
Lamp bead utilization rate is high, good dimming effect.Meanwhile, compared with existing linearity light adjusting mode in the market, the utility model increases
Add line voltage compensation function, improve line regulation, when realizing that input voltage ± 10% fluctuates, output current fluctuation scope control
In ± 7%, line regulation is better than linearity light adjusting settling mode in the market for system.
The utility model additionally provides a kind of linearity light adjusting method, using linearity light adjusting system described in the utility model,
Method comprises the following steps：(1) when busbar voltage is more than or equal to first threshold, the first control chip and the second control chip are opened
Beginning work, the 3rd control chip is passively turned on, and the busbar voltage is supplied by first control chip to the second LED load
Electricity, the busbar voltage is powered by second control chip to the first LED load so that first LED load and
Two LED loads are in parallel；(2) the output voltage current potential in the first resistor that the CS pins of first control chip are detected
The constant flow module for changing negative-feedback to first control chip caused by busbar voltage change, first control chip
Constant flow module generates power tube control signal, controls the work resistance of the power tube inside the constant flow module of first control chip
State, for second LED load provides constant output current；(3) institute that the CS pins of second control chip are detected
State the output voltage current potential in second resistance and change negative-feedback to second control chip by what busbar voltage change caused
Constant flow module, the constant flow module generation power tube control signal of second control chip, controls second control chip
The work resistance state of the power tube inside constant flow module, for first LED load provides constant output current.Wherein step
(2), the execution of (3) is without sequencing.
Preferably, methods described is further included：When busbar voltage is more than or equal to Second Threshold, the first control core
Piece, the second control chip do not work, and the 3rd control chip starts to first LED load and second LED load
Power supply so that first LED load and second LED load are connected, wherein, the Second Threshold is more than first threshold
Value；The output voltage in the 3rd resistor that the CS pins of the 3rd control chip are detected is caused by busbar voltage change
Potential change negative-feedback to the 3rd control chip constant flow module, the 3rd control chip constant flow module generation work(
Rate pipe control signal, controls the work resistance state of the power tube inside the constant flow module of the 3rd control chip, is described first
LED load and the second LED load provide constant output current.
Preferably, the VD pins of the 3rd control chip are electrically connected with the 3rd control chip by the 4th resistance
Drain pins, the 3rd control chip further includes line voltage compensation module；When first LED load and described
When two LED loads are connected, methods described is further included：The line voltage compensation module receives the VD of the 3rd control chip
The external compensation electric current arrived by the 4th resistance detection on pin, and according to the corresponding benefit of external compensation electric current generation
Voltage is repaid, is compensated with the reference voltage of the constant flow module to being input into the 3rd control chip, so that output electricity
Stream keeps constant.
The above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
Art personnel, on the premise of the utility model principle is not departed from, can also make some improvements and modifications, these improvements and modifications
Also should be regarded as protection domain of the present utility model.
Claims (14)
1. rectification circuit and the rectification circuit that a kind of lighting device, including alternating-current voltage source is electrically connected with alternating-current voltage source
The bus capacitor of electric connection, the alternating voltage of the alternating-current voltage source is input to the bus capacitor by the rectification circuit
On obtain busbar voltage；Characterized in that, described device also includes：First controller, second controller, the 3rd controller,
Two LED loads and the first LED load；
First controller is connected into tie point, the second controller and a LED with second LED load
Load in series is into the second branch road, and the tie point is connected with after second branch circuit parallel connection with the 3rd controller, described
First controller is electrically connected with the negative electrode of diode with the common port of second LED load, and the anode of the diode is electrical
Connect the common port of the second controller and first LED load；
When busbar voltage is more than or equal to first threshold, the busbar voltage is powered by the first controller to the second LED load,
The busbar voltage is powered by second controller to the first LED load, and the 3rd controller is passively turned on so that described
Two LED loads and the first LED load parallel operation；
When busbar voltage is more than or equal to Second Threshold, first controller, second controller do not work, the 3rd control
Device starts to be powered to first LED load and second LED load, first LED load, the diode, described
Second LED load and the 3rd controller constitute series circuit so that second LED load is negative with a LED
Tandem working is carried, wherein, the Second Threshold is more than the first threshold.
2. lighting device according to claim 1, it is characterised in that the input of first controller and described first
The forward end of LED load is used to receive the busbar voltage；The negative end of second LED load and the second controller
Output end is coupled to the input of the 3rd controller.
3. lighting device according to claim 2, it is characterised in that
First controller detects the busbar voltage, when the busbar voltage is more than or equal to first threshold, described first
Controller turns on its built-in power tube and is powered to second LED load；
The second controller detects the busbar voltage by first LED load, when the busbar voltage is more than or equal to
During first threshold, the second controller turns on its built-in power tube and is powered to first LED load；
3rd controller detects the busbar voltage by second branch road, when the busbar voltage is more than or equal to first
During threshold value, the 3rd controller is passively turned on so that second LED load and the first LED load parallel operation.
4. lighting device according to claim 1, it is characterised in that
The input of first controller is used to receive the busbar voltage with the forward end of first LED load；
The output end of first controller is electrically connected with the forward end of second LED load by first resistor, while logical
Cross the negative end that the diode is electrically connected with first LED load；
The negative end of first LED load is further electrically connected with the input of the second controller；
The negative end of second LED load is electrically connected with described with the output end of the second controller by second resistance
The input of three controllers；
The output end of the 3rd controller is grounded by 3rd resistor.
5. lighting device according to claim 4, it is characterised in that
First controller detects the busbar voltage by the first resistor, when the busbar voltage is more than or equal to second
During threshold value, first controller turns off its built-in power tube to be stopped being powered to second LED load；
The second controller detects the busbar voltage by the second resistance, when the busbar voltage is more than or equal to second
During threshold value, the second controller turns off its built-in power pipe to be stopped being powered to first LED load；
3rd controller detects the busbar voltage by the 3rd resistor, when the busbar voltage is more than or equal to described
During Second Threshold, the 3rd controller turns on its built-in power tube and is powered to first LED load, the second LED load,
So that the second LED load and the first LED load tandem working.
6. lighting device according to claim 1, it is characterised in that first controller, second controller, the 3rd control
Device processed is constant current drive control device.
7. lighting device according to claim 1, it is characterised in that first controller, second controller, the 3rd control
Device processed includes：Power supply module and constant flow module；
The power supply module, for receiving the input voltage to corresponding controllers, and in the input voltage more than or equal to described
During the default startup threshold value of power supply module, generation reference voltage is input into the constant flow module；
The constant flow module, for receiving the output voltage that the reference voltage and corresponding controllers output end are detected, and
Comparative result generation power tube control signal according to the reference voltage and the output voltage, controls in the constant flow module
The work resistance state of the power tube in portion, so as to control the size of corresponding controllers output current.
8. lighting device according to claim 7, it is characterised in that the 3rd controller is further included：Line voltage
Compensating module；
The line voltage compensation module is for receiving external compensation electric current and corresponding according to external compensation electric current generation
Offset voltage, compensates, with to the reference voltage for being input into the constant flow module so that the 3rd controller is defeated
Go out electric current and keep constant.
9. a kind of control chip for linearity light adjusting system, it is characterised in that the control chip includes：Power supply module and
Constant flow module；
The power supply module, for being detected on the Drain pins for receiving the control chip to the defeated of the control chip
Enter voltage, and in default startup threshold value of the input voltage more than or equal to the power supply module, generation reference voltage input
The constant flow module；
The constant flow module, it is defeated for what is detected on the CS pins for receiving the reference voltage and the reception control chip
Go out voltage, and power tube control signal is generated according to the comparative result of the reference voltage and the output voltage, control is described
The work resistance state of the power tube inside constant flow module, so as to control the size of control chip output current.
10. control chip according to claim 9, it is characterised in that the control chip is further included：Line voltage is mended
Repay module；
The line voltage compensation module, for the external compensation electric current detected on the VD pins for receiving the control chip, and
Corresponding offset voltage is generated according to the external compensation electric current, is carried out with to the reference voltage for being input into the constant flow module
Compensation, so that control chip output current keeps constant.
A kind of 11. linearity light adjusting systems, including the rectification circuit that is electrically connected with of alternating-current voltage source and the alternating-current voltage source and
The bus capacitor that the rectification circuit is electrically connected with, the alternating voltage of the alternating-current voltage source is input to by the rectification circuit
Busbar voltage is obtained on the bus capacitor；Characterized in that, the system is included using the control chip described in claim 9
The first control chip, the second control chip, the 3rd control chip, the first LED load and the second LED load；
First control chip, Drain pins are used to receive the busbar voltage, and CS pins are electrically connected with by first resistor
To the forward end of second LED load, the negative end of second LED load is electrically connected to described the by second resistance
The Drain pins of three control chips；
The CS pins of first control chip are further electrically connected with the negative electrode of diode, and the anode of the diode electrically connects
Connect the negative end of first LED load；
Second control chip, Drain pins are electrically connected with the negative end of first LED load, and CS pins are by described
Second resistance is electrically connected to the Drain pins of the 3rd control chip, and the forward end of first LED load is used to receive
The busbar voltage；
3rd control chip, CS pins are grounded by 3rd resistor；
First control chip, second control chip and the 3rd control chip are corresponding by being electrically connected at
Drain pins on power supply module detect the input voltage of corresponding control chip, judge corresponding input voltage more than or equal to supplying
Corresponding control chip is started working during the default startup threshold value of electric module；The corresponding control chip started working is by correspondence
CS pins detect output voltage potential change negative-feedback on corresponding resistor to corresponding constant flow module, corresponding constant current mould
Block generates power tube control signal, the work resistance state of corresponding power tube is controlled, so as to control corresponding control chip output current
Size.
12. systems according to claim 11, it is characterised in that when the busbar voltage is more than or equal to first threshold,
First control chip and second control chip judge default startup of the input voltage more than or equal to its power supply module
Threshold value, first control chip and second control chip are started working, and the 3rd control chip judges input voltage
Less than the default startup threshold value of its power supply module, the 3rd control chip is passively turned on, and the busbar voltage is by described the
One control chip is powered to second LED load, and the busbar voltage gives a LED by second control chip
Load supplying so that first LED load and second LED load are in parallel；
The output voltage current potential in the first resistor that the CS pins of first control chip are detected is become by busbar voltage
The constant flow module for changing negative-feedback to first control chip that change causes, the constant flow module generation of first control chip
Power tube control signal, controls the work resistance state of the power tube of first control chip, for second LED load provides perseverance
Fixed output current；
The output voltage current potential in the second resistance that the CS pins of second control chip are detected is become by busbar voltage
The constant flow module for changing negative-feedback to second control chip that change causes, the constant flow module generation of second control chip
Power tube control signal, controls the work resistance state of the power tube of second control chip, for first LED load provides perseverance
Fixed output current.
13. systems according to claim 11, it is characterised in that described when busbar voltage is more than or equal to Second Threshold
First control chip turn off its built-in power tube stop being powered to second LED load, second control chip shut-off
Its built-in power tube stops being powered to first LED load, and the 3rd control chip judges that input voltage is more than or equal to
The default startup threshold value of its power supply module, the 3rd control chip starts negative to first LED load and the 2nd LED
Carry power supply so that first LED load and second LED load are connected；
The output voltage in the 3rd resistor that the CS pins of the 3rd control chip are detected is drawn by busbar voltage change
Rise potential change negative-feedback to the 3rd control chip constant flow module, the 3rd control chip constant flow module generation
Power tube control signal, controls the work resistance state of the power tube of the 3rd control chip, is first LED load and second
LED load provides constant output current.
14. systems according to claim 13, it is characterised in that the VD pins of the 3rd control chip are by the 4th electricity
Resistance is electrically connected with the Drain pins of the 3rd control chip, and the 3rd control chip further includes line voltage compensation mould
Block；
When first LED load and second LED load are connected, the line voltage compensation module receives the 3rd control
The external compensation electric current arrived by the 4th resistance detection on the VD pins of coremaking piece, and given birth to according to the external compensation electric current
Into corresponding offset voltage, compensated with the reference voltage of the constant flow module to being input into the 3rd control chip, so that
Output current keeps constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621300929.7U CN206196097U (en) | 2016-11-30 | 2016-11-30 | Lighting device , control chip and linear dimming system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621300929.7U CN206196097U (en) | 2016-11-30 | 2016-11-30 | Lighting device , control chip and linear dimming system |
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| CN206196097U true CN206196097U (en) | 2017-05-24 |
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ID=58723048
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658838A (en) * | 2016-11-30 | 2017-05-10 | 上海晶丰明源半导体股份有限公司 | Lighting device, control chip, linear dimming system and linear dimming method |
| CN107660019A (en) * | 2017-08-31 | 2018-02-02 | 开发晶照明（厦门）有限公司 | Light source and light emitting module |
-
2016
- 2016-11-30 CN CN201621300929.7U patent/CN206196097U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658838A (en) * | 2016-11-30 | 2017-05-10 | 上海晶丰明源半导体股份有限公司 | Lighting device, control chip, linear dimming system and linear dimming method |
| CN107660019A (en) * | 2017-08-31 | 2018-02-02 | 开发晶照明（厦门）有限公司 | Light source and light emitting module |
| US10264636B2 (en) | 2017-08-31 | 2019-04-16 | Kaistar Lighting (Xiamen) Co., Ltd. | Light source and light emitting module |
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