CN105376896B - A kind of light adjusting circuit and lighting system - Google Patents
A kind of light adjusting circuit and lighting system Download PDFInfo
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- CN105376896B CN105376896B CN201410405418.0A CN201410405418A CN105376896B CN 105376896 B CN105376896 B CN 105376896B CN 201410405418 A CN201410405418 A CN 201410405418A CN 105376896 B CN105376896 B CN 105376896B
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Abstract
A kind of lighting system includes at least one LED load and a light adjusting circuit for controlling the LED load brightness.The light adjusting circuit includes a dim signal generation module for being connected with power input Vin and be used to generate dim signal, one DC DC power module for exporting power supply, one switching signal conversion module, one filter module and a noise reduction module being connected between the filter module and the DC DC power modules.The switching signal conversion module is used to the dim signal of the dim signal generation module being converted to switch control signal.The filter module is connected with the noise reduction module by common ground end and the interference for eliminating the power input Vin.The noise reduction module opens the DC DC power modules when the switch control signal received is high level and prevents noise from entering dim signal to turn off the DC DC power modules when low level and the DC DC power modules being isolated with the filter module in the switch control signal received.
Description
Technical field
The present invention relates to lamp light-regulating circuit, especially a kind of light adjusting circuit and lighting system.
Background technology
Compared to traditional lighting lamps and lanterns, LED lamp has the advantages that low energy consumption, light efficiency is high, therefore LED lamp is able to rapidly
It promotes and applies.And different lamps brightness is needed in different occasions, thus produce the need that the brightness of LED lamp is adjusted
It asks.
In the prior art, the adjusting of lamp brightness is generally realized by pwm signal control DC-DC power module.Fig. 1 is
A kind of LED light adjusting circuits that the prior art provides are directly driven by DC-DC dims foot by pwm signal and realize LED load
Brightness regulation.But the LED light adjusting circuits need three lines that input could realize light modulation so that pwm signal generation module can not be with
DC-DC module is separately arranged, and then increases wiring difficulty.
Fig. 2 is another LED light adjusting circuit that the prior art provides, opened by pwm signal driving switch pipe
It turns off DC-DC circuits and realizes the brightness regulation to LED load, to realize the light modulation of two lines.But due to DC-DC circuits
Input terminal usually requires access filter capacitor to reduce the interference of power grid, and when the switching tube of LED light modulation circuits disconnects, the filter
Wave capacitance can not turn off in time.When the filter capacitor can not turn off in time, the filter capacitor and DC-DC output forming circuit and
Electric discharge, and when switching tube opening, which can then charge.Thus, when switch motion occurs for switching tube, the filter capacitor
Just charge repeatedly, to cause light modulation poor linearity and noise it is big.
Invention content
In view of this, the present invention provide it is a kind of being suitble to the input of two lines and the small LED light adjusting circuits of noise, to solve above-mentioned skill
Art problem.
A kind of light adjusting circuit, including a dim signal for being connected with power input Vin and be used to generate dim signal
Generation module, one for export power supply DC-DC power module, one with the dim signal generation module electric connection
Switching signal conversion module, a filter module and one are connected to the switching signal conversion module and DC-DC electricity
Noise reduction module between the signal ground end of source module.The switching signal conversion module is used to the dim signal generating mould
The dim signal of block is converted to switch control signal.The filter module passes through common ground end and the electrical phase of the noise reduction module
Connect and be used to eliminate the interference of the power input Vin.The noise reduction module is in the switch control signal received
It works normally the DC-DC power module when high level and is turned off when the switch control signal received is low level
The filter module is isolated with the DC-DC power module and noise signal is prevented to enter transmission by the DC-DC power module
To the dim signal of the DC-DC power module.
A kind of lighting system, including the brightness of at least one LED load and one for controlling the LED load
Light adjusting circuit.The light adjusting circuit includes a dim signal for being connected with power input Vin and be used to generate dim signal
Generation module, one for export power supply DC-DC power module, one with the dim signal generation module electric connection
Switching signal conversion module, a filter module and one are connected to the switching signal conversion module and DC-DC electricity
Noise reduction module between the signal ground end of source module.The switching signal conversion module is used to the dim signal generating mould
The dim signal of block is converted to switch control signal.The filter module passes through common ground end and the electrical phase of the noise reduction module
Connect and be used to eliminate the interference of the power input Vin.The noise reduction module is in the switch control signal received
It works normally the DC-DC power module when high level and is turned off when the switch control signal received is low level
The filter module is isolated with the DC-DC power module and noise signal is prevented to enter transmission by the DC-DC power module
To the dim signal of the DC-DC power module.
Compared with prior art, filter module of the present invention is not input terminal that is direct and coupling the DC-DC power module,
But by connecting the noise reduction module later in the input terminal for being connected to the DC-DC power module, so that the drop
Module of making an uproar is isolated by the filter module with the DC-DC power module.The noise reduction module is connected to the DC-DC electricity
The signal ground end (ends SGND) of source module, rather than connect the light modulation foot of DC-DC power module（DIM feet）.The thus present invention
The circuit between the filter module and the DC-DC power module can be cut off, and then solve institute when closing output
Filter module is stated to be formed into a loop with the DC-DC power module and load and discharge and cause electric quantity loss and generate because of repeated charge
And the noise problem generated.Meanwhile light adjusting circuit of the present invention will not generate and cause because of the hardware deviation of DC-DC power module
Light modulation foot there are problems that exporting time-delay closing after closing, so that light adjusting circuit of the present invention can solve different size DC-
Two lines of DC power module dim problem.
Description of the drawings
The embodiment of the present invention is described below in conjunction with attached drawing, wherein：
Fig. 1 is a kind of circuit diagram of light adjusting circuit in the prior art.
Fig. 2 is the circuit diagram of another light adjusting circuit in the prior art.
Fig. 3 is a kind of schematic diagram of light adjusting circuit provided by the invention.
Fig. 4 is the circuit diagram of light adjusting circuit shown in Fig. 3.
Specific implementation mode
Specific embodiments of the present invention are further elaborated below based on attached drawing.It should be understood that herein
The explanation of the embodiment of the present invention is not intended to limit the scope of protection of the present invention.
Fig. 3 and Fig. 4 is please referred to, is the schematic diagram and circuit diagram of a kind of lighting system 1000 provided by the invention.It is described
Lighting system 1000 includes a light adjusting circuit 100 and at least one LED load 200.The light adjusting circuit 100 includes a tune
Optical signal generation module 10, a DC-DC power module 20 for exporting power supply, a switching signal conversion module 30, one
A filter module 40 and an input for being connected to the switching signal conversion module 30 and the DC-DC power module 20
The noise reduction module 50 at end.The lighting system 1000 further includes for providing for example 24V to the dim signal generation module 10
The power supply etc. of DC voltage Vin, which is a technique known to those skilled in the art, and details are not described herein again.
The dim signal generation module 10 is used to generate the dim signal for controlling the LED load 200.Institute's dim signal
Generation module 10 include PWM (Pulse Width Modulation, pulse width modulation) signal generation unit 11 and
One the first electronic switch Q1.The PWM signal generation unit 11 controls the LED load for generating pwm signal
200 brightness etc..The duty ratio of the PWM signal generation unit 11 is adjusted according to actual needs, i.e., by adjusting PWM letters
The duty ratio for number generating unit 11 adjusts the parameter of the LED load, such as brightness.The PWM signal generation unit 11
Device selects and principle is all the prior art, and details are not described herein again.The first electronic switch Q1 generates single according to pwm signal
Member 11 pwm signal and break-make.The first electronic switch Q1 is connected when receiving high level signal, and is receiving low level
It is disconnected when signal.The first electronic switch Q1 can be an enhanced MOS of N-channel（Metal Oxide
Semiconductor, metal oxide semiconductor field effect transistor）Pipe.
The DC-DC power module 20 is used to certain DC voltage value being converted to another DC voltage value, and the DC-DC
The ends output end Vled+, Vled- of power module 20 are connected with the LED load 200 and are formed into a loop to give the LED load 200
Power supply.The DC-DC power module 20 includes a dc chopper, and specification, the parameter of the dc chopper are all this field
Technology known by technical staff, details are not described herein again.
The dim signal that the switching signal conversion module 30 is used to send out the dim signal generation module 10 is converted
For switch control signal.The switching signal conversion module 30 includes a first resistor R1, a second resistance R3, one three
A pole pipe Q2 and diode D9.The first resistor R1 is connected to the dim signal generation module 10 and three pole
Between the base stage of pipe Q2.The second resistance R3 is connected with the collector of the first resistor R1 and the triode Q2 respectively
It connects.The cathode of the diode D9 is defeated with the dim signal generation module 10 again after being connected with the base stage of the triode Q2
Outlet is connected.The anode of the diode D9 is connected with the emitter of the triode Q2.In the present embodiment, believed using PWM
Number be used as dim signal, i.e., the described dim signal generation module 10 include a PWM signal generation unit 11 and a conduct
The enhanced metal-oxide-semiconductor of N-channel of first electronic switch Q1.Therefore, PWM signal generation unit 11 described in the one end the first resistor R1
The ends VCC be connected after be connected again with the second resistance R3, the base stage phase of triode Q2 described in the other end of first resistor R1
Even.The cathode of the diode D9 be connected with the base stage of the triode Q2 after again with the N-channel as the first electronic switch Q1
The drain electrode of enhanced metal-oxide-semiconductor is connected.The collector and emitter of the triode Q2 respectively with the second resistance R3 and described
The anode of diode D9 is connected.Thus, what the switch conversion module 30 can generate the PWM signal generation unit 11
Pwm signal is converted to switching signal, and the switch control signal and pwm signal frequency having the same.
The filter module 40 is connected with the ends VCC of the PWM signal generation unit 11 of the dim signal generation module 10
It is connected in parallel on the VCC input terminals of the DC-DC power module 20 and ground connection later.The filter module 40 is connected to the DC-DC
The ends VCC of power module 20 avoid the DC-DC power module 20 from being interfered to filter.Those skilled in the art can manage
The ends VCC of solution, the PWM signal generation unit 11 are connected with input feeder ear Vin, thus for the side of connection
Just, the filter module 40 is connected with the ends VCC of the PWM signal generation unit 11.In the present embodiment, the filter module
40 include a capacitance C1, and capacitance C1 is grounded.Capacitance C1 can also coordinate with other components to realize filter function.
In the present embodiment, when the noise reduction module 50 opens the DC-DC power module 20 for high level signal, the filtering mould
Both end voltage on the capacitance C1 of block 40 charges to 24V by connecting the power supply ends VCC of the signal generator module 10.And work as
When the noise reduction module 50 turns off the DC-DC power module 20 for low level signal, the capacitance C1 of the filter module 40
It can only be discharged by the first resistor R1 of the switching signal conversion module 30, the both end voltage on capacitance C1 is 22V.Cause
And the pressure drop of the filter module 40 generated by electric discharge is very small, in the noise reduction module 50 again according to high level
Signal and open the DC-DC power module 20 and so that the time of the filter module 40 charging is short, noise is small.The filtering mould
Specification, the parameter of the capacitance C1 of block 40 are all the technology known by those skilled in the art, and details are not described herein again.
The noise reduction module 50 is connected to the signal of the switching signal conversion module 30 and the DC-DC power module 20
Ground terminal（The ends SGND）Between, and be connected with the filter module 40 by connecting common ground end with by the filter module 40
It is isolated with the DC-DC power module 20 to prevent noise signal into the tune for being transferred to the DC-DC power module 50
Optical signal.The noise reduction module 50 is high electricity in the switch control signal of the switching signal conversion module 30 received
Usually to open the DC-DC power module 20, and the DC-DC power source is turned off when the switch control signal is low level
Module 20.In the present embodiment, the noise reduction module 50 includes an a second electronic switch Q3 and 3rd resistor R4.
The 3rd resistor R4 is connected with the collector and emitter of the triode Q2 respectively.The second electronic switch Q3 is connected to
It is grounded together between the 3rd resistor R4 and the signal ground end of the DC-DC power module and with the 3rd resistor R4.
The second electronic switch Q3 may further be an enhanced metal-oxide-semiconductor of N-channel.And the grid of the metal-oxide-semiconductor and the third
One end of resistance R4 is connected, and the drain electrode of the metal-oxide-semiconductor is connected with the signal ground end (ends SGND) of the DC-DC power module 20,
And the source electrode of the metal-oxide-semiconductor reconnects common ground end after being connected with the other end of the 3rd resistor R4.
LED (Lighting Emitting Diode, the light emitting diode) load 200 is for shining and providing illumination.
The quantity and specification of the LED load 200 determine which is a technique known to those skilled in the art according to lighting demand,
Details are not described herein again.
The concrete principle of the light adjusting circuit 100 of the present invention is analyzed as follows：The pwm signal of the dim signal generation module 10
When the pwm signal that generation unit 11 is sent out is high level, the first electronic switch Q1 is opened and is connected and is pulled low to zero rapidly
Current potential, i.e., when the current potential of the drain electrode a points of the enhanced metal-oxide-semiconductor of N-channel as shown in Figure 2 is close to zero potential so that the switch
The triode Q2 cut-offs of signal conversion module 30.The current potential of b points is divided according to second resistance R3,3rd resistor R4 in Fig. 2 at this time
And it determines.By designing the second resistance R3, the resistance value of 3rd resistor R4 and the specification of the second electronic switch Q3, make
The the second electronic switch Q3 conductings for obtaining the noise reduction module 50, make the DC-DC power source to open the DC-DC power module 20
Module 20 works normally.The pwm signal that the PWM signal generation unit 11 of the dim signal generation module 10 is sent out is low level
When, the first electronic switch Q1 cut-offs so that a points are hanging, and the diode D9 can prevent electric current from pouring in down a chimney.And the filtering
The capacitance C1 of module 40 starts to discharge, so that the first resistor R1 of the switching signal conversion module 30 drives three pole
Pipe Q2 conductings.After the triode Q2 conductings of the switching signal conversion module 30 so that the b points current potential i.e. current collection of triode Q2
The current potential of pole is down to zero potential due to being pulled to ground rapidly.When b point current potentials are zero potential, the second electricity of the noise reduction module 50
Sub switch Q3 ends rapidly, to close the DC-DC power module 20.Meanwhile the capacitance C1 of the filter module 40 only has
It is slowly discharged by the first resistor R1 of the switching signal conversion module 30, so that the dim signal generation module 10
PWM signal generation unit 11 high level signal occur again before, the capacitance C1 discharge capacities of the filter module 40 are seldom, should
The voltage at the both ends capacitance C1 maintains the input voltage of the DC-DC power module 20 substantially, to prevent noise from entering the PWM
In signal, that is, noise is prevented to enter in the dim signal for being transferred to the DC-DC power module 20.Thus, the noise reduction mould
Block 50 realizes the light modulation of two lines and can be isolated with the filter module 40 and reduce the noise generated by charge and discharge.
Compared with prior art, filter module 40 of the present invention is not direct and couples the defeated of the DC-DC power module 20
Enter end, but by connecting the noise reduction module 50 later in the input terminal for being connected to the DC-DC power module 20, to make
It obtains the noise reduction module 50 filter module 40 is isolated with the DC-DC power module 20.The noise reduction module 50
It is connected to the signal ground end of the DC-DC power module 20（The ends SGND）, rather than connect the light modulation foot of DC-DC power module
(DIM feet).Thus the present invention can cut off the filter module 40 and the DC-DC power module when closing output
Circuit between 20, and then solve the filter module and be formed into a loop with the DC-DC power module 20 and load 200 and discharge and make
The noise problem generated by repeated charge is generated at electric quantity loss.Meanwhile light adjusting circuit 100 of the present invention will not generate
Cause to dim because of the hardware deviation of DC-DC power module 20 and there are problems that exporting time-delay closing after foot is closed, so that
Light adjusting circuit 100 of the present invention can solve the problems, such as the two lines light modulation of different size DC-DC power module 20.
The foregoing is merely a prefered embodiment of the invention, is not used to limitation protection scope of the present invention, any in the present invention
Modification, equivalent replacement or improvement in spirit etc., all cover in scope of the presently claimed invention.
Claims (9)
1. a kind of light adjusting circuit, including a dim signal production for being connected with power input Vin and being used to generate dim signal
Raw module, a DC-DC power module for exporting power supply, it is characterised in that：The light adjusting circuit further includes one and institute
The switching signal conversion module of dim signal generation module electric connection is stated, a filter module and one are connected to described
Noise reduction module between switching signal conversion module and the signal ground end of the DC-DC power module, the switching signal turn
Mold changing block is used to the dim signal of the dim signal generation module being converted to switch control signal, and the filter module passes through
Common ground end is electrical connected with the noise reduction module and is used to eliminate the interference of the power input Vin, the noise reduction mould
Block makes the DC-DC power module work normally and receive in the switch control signal received when high level
The switch control signal turns off the DC-DC power module when being low level, by the filter module and the DC-DC power source mould
Block is isolated and noise signal is prevented to enter the dim signal for being transferred to the DC-DC power module.
2. light adjusting circuit according to claim 1, it is characterised in that：The filter module includes a filter capacitor C1,
The one end filter capacitor C1 is connect with the input terminal of the DC-DC power module and the connection of the filter capacitor C1 other ends is public connects
Ground terminal.
3. light adjusting circuit according to claim 1, it is characterised in that：The switching signal conversion module includes one first
Resistance R1, second resistance a R3, a triode Q2 and diode a D9, the first resistor R1 are connected to described
Between dim signal generation module and the base stage of the triode Q2, the second resistance R3 respectively with the first resistor R1 and
The collector of the triode Q2 is connected, the cathode of the diode D9 be connected with the base stage of the triode Q2 after again with institute
The output end for stating dim signal generation module is connected, and the anode of the diode D9 is connected with the emitter of the triode Q2.
4. light adjusting circuit according to claim 1, it is characterised in that：The dim signal module includes a PWM
(Pulse Width Modulation, pulse width modulation) signal generation unit, the PWM signal generation unit is for generating
Pwm signal.
5. light adjusting circuit according to claim 4, it is characterised in that：The dim signal module further includes one first electricity
Sub switch Q1, the first electronic switch Q1 are connected according to the high level signal that the PWM signal generation unit is sent out and low
It is turned off when level signal.
6. light adjusting circuit according to claim 5, it is characterised in that：First electronic switch Q1 is that a N-channel is enhanced
MOS (Metal Oxide Semiconductor, metal oxide semiconductor field effect transistor) is managed.
7. light adjusting circuit according to claim 3, it is characterised in that:The noise reduction module include 3rd resistor R4 with
And a second electronic switch Q3, the 3rd resistor R4 are connected with the collector and emitter of the triode Q2 respectively, institute
State the second electronic switch Q3 be connected between the 3rd resistor R4 and the signal ground end of the DC-DC power module and with institute
3rd resistor R4 is stated to be grounded together.
8. light adjusting circuit according to claim 7, it is characterised in that：The second electronic switch Q3 may further be one
A enhanced metal-oxide-semiconductor of N-channel, and the grid of the metal-oxide-semiconductor is connected with one end of the 3rd resistor R4, the drain electrode of the metal-oxide-semiconductor with
The signal ground end of the DC-DC power module is connected, and the source electrode of the metal-oxide-semiconductor is connected with the other end of the 3rd resistor R4
Common ground end is reconnected afterwards.
9. a kind of lighting system, including at least one LED load, it is characterised in that：The lighting system further includes according to right
It is required that the light adjusting circuit described in any one of 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410405418.0A CN105376896B (en) | 2014-08-18 | 2014-08-18 | A kind of light adjusting circuit and lighting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410405418.0A CN105376896B (en) | 2014-08-18 | 2014-08-18 | A kind of light adjusting circuit and lighting system |
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| Publication Number | Publication Date |
|---|---|
| CN105376896A CN105376896A (en) | 2016-03-02 |
| CN105376896B true CN105376896B (en) | 2018-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410405418.0A Active CN105376896B (en) | 2014-08-18 | 2014-08-18 | A kind of light adjusting circuit and lighting system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107787089B (en) * | 2017-11-03 | 2023-06-20 | 赛尔富电子有限公司 | LED lamp regulation and control system |
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| CN204157105U (en) * | 2014-08-18 | 2015-02-11 | 宁波高新区赛尔富电子有限公司 | A kind of light adjusting circuit and illuminator |
| CN104519633A (en) * | 2013-09-29 | 2015-04-15 | 林万炯 | Undervoltage protective circuit for LED lamps |
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|---|---|---|---|---|
| CN101753081A (en) * | 2008-12-01 | 2010-06-23 | 艾默生网络能源系统北美公司 | Fan drive circuit and fan using same |
| CN201690647U (en) * | 2010-04-07 | 2010-12-29 | 福建捷联电子有限公司 | Burst mode light dimming driving circuit of LED tube |
| JP2012014965A (en) * | 2010-07-01 | 2012-01-19 | Mitsumi Electric Co Ltd | Power supply for lighting and lighting system |
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| CN105376896A (en) | 2016-03-02 |
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Address after: The national high tech Zone Juxian 315103 Ningbo Road, Zhejiang province No. 1345 Applicant after: SELF ELECTRONICS CO., LTD. Address before: The national high tech Zone Juxian 315103 Ningbo Road, Zhejiang province No. 1345 Applicant before: SELF ELECTRONICS CO.,LTD. |
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Inventor after: Yu Jianfeng Inventor before: Yu Jianfeng |
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