CN108055733A - A kind of driving circuit and lighting system - Google Patents
A kind of driving circuit and lighting system Download PDFInfo
- Publication number
- CN108055733A CN108055733A CN201711498339.9A CN201711498339A CN108055733A CN 108055733 A CN108055733 A CN 108055733A CN 201711498339 A CN201711498339 A CN 201711498339A CN 108055733 A CN108055733 A CN 108055733A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of driving circuit and liquid crystal display device, which includes：Current rectifying and wave filtering circuit, it is direct current that the current rectifying and wave filtering circuit, which is used for the AC conversion that will be inputted,；Booster circuit, the input terminal of the booster circuit couple the current rectifying and wave filtering circuit；First capacitance, the first end of first capacitance are coupled to the output terminal of the booster circuit, second end ground connection；Control circuit, the control terminal of the control circuit couple the control terminal of the booster circuit, export control signal to the booster circuit, the frequency of the control signal is more than setpoint frequency；Transformer, the transformer secondary output winding couple light source to be driven, and armature winding couples the booster circuit, and auxiliary winding couples the control circuit.By the above-mentioned means, the present invention enables to the light intensity of light source output to stablize, vibration frequency is higher than the recognized frequency of user.
Description
Technical field
The present invention relates to lighting area, more particularly to a kind of driving circuit and lighting system.
Background technology
With advances in technology, LED light is widely used in all kinds of illuminations, and instead of traditional fluorescent lamp, LED lamp is again high
The advantages that effect, long lifespan.Rectification is carried out to ac voltage signal by current rectifying and wave filtering circuit in existing LED illumination driving circuit
Output is to light source after filtering, to realize the driving to light source.However, since by current rectifying and wave filtering circuit, inevitably there are works
Frequency ripple, the working frequency ripple wave are exported by primary winding input coupling to secondary windings, and causing LED, there are power frequency sudden strains of a muscle
It is bright, influence user's perception.
The content of the invention
Present invention is primarily intended to provide a kind of driving circuit and lighting system, the stroboscopic that can improve in light source illumination shows
As.
To achieve the above object, one aspect of the present invention is：A kind of driving circuit is provided, including：Rectification
Filter circuit, it is direct current that the current rectifying and wave filtering circuit, which is used for the AC conversion that will be inputted,；Booster circuit, the booster circuit
Input terminal couple the current rectifying and wave filtering circuit；First capacitance, the first end of first capacitance are coupled to the booster circuit
Output terminal, second end ground connection；Control circuit, the control terminal of the control circuit couple the control terminal of the booster circuit, to
The booster circuit exports control signal, and the frequency of the control signal is more than setpoint frequency；Transformer, the transformer secondary output
Winding couples light source to be driven, and armature winding couples the booster circuit, and auxiliary winding couples the control circuit.
To achieve the above object, another technical solution used in the present invention is：A kind of lighting system is provided, including light source
With driving circuit as described above, the driving circuit is used to that the light source to be driven to be illuminated.
The beneficial effects of the invention are as follows：The situation of the prior art is different from, the present invention is using booster circuit to DC power supply
The voltage signal of input carries out voltage stabilizing, and the working condition of booster circuit is controlled by control circuit so that voltage signal fluctuates
Frequency becomes high frequency, and by this high frequency signal transmission to the first capacitance, the frequency of the ripple of such first capacitance generation is also
High frequency so that light source emit beam intensity stabilization and vibration frequency user it is not noticeable, improve light source illumination in stroboscopic phenomenon,
Improve user's perception.
Description of the drawings
Fig. 1 is the structure diagram of an embodiment of driving circuit provided by the invention；
Fig. 2 is the circuit diagram of an embodiment of lighting system provided by the invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment belongs to the scope of protection of the invention.
Referring to Fig. 1, Fig. 1 is the structure diagram of the first embodiment of driving circuit provided by the invention.Driving circuit
10 include current rectifying and wave filtering circuit 11, booster circuit 12, the first capacitance 13, control circuit 14 and transformer 15.Current rectifying and wave filtering circuit
11 are used to the alternating current of external world's input becoming direct current by rectification and filtering, and the input terminal 121 of booster circuit 12 couples whole
Flow filter circuit 11.The output terminal 122 of one end coupling booster circuit 12 of first capacitance 13, other end ground connection.Control circuit 14
The control terminal 123 of booster circuit 11 is coupled to, exports control signal to booster circuit 12, the frequency of the control signal is more than
50KHz.151 optical light source of secondary windings of transformer 15, armature winding 152 couple the output terminal 122 of booster circuit 12, auxiliary
Winding 153 couples control circuit 14.
Current rectifying and wave filtering circuit 11, current rectifying and wave filtering circuit are first passed around when extraneous AC power input ac voltage signal
11 filter AC rectification, become d. c. voltage signal output, current rectifying and wave filtering circuit 11 can include in this implement scene
The electric bridge and a capacitance being grounded of four end to end first diode compositions.D. c. voltage signal inputs booster circuit 12
Input terminal 121, after the boosted circuit 12 of d. c. voltage signal, the voltage signal fluctuating range exported by output terminal 122 becomes smaller,
The working condition of high-frequency signal control booster circuit 11 of 14 output frequency of control circuit more than 50KHz so that booster circuit 11
The frequency of the voltage signal fluctuation of output becomes high frequency, this vibration frequency is transferred to the first capacitance for the voltage signal of high frequency
13, the amplitude for the ripple that such first capacitance 13 generates is relatively low and frequency also becomes high frequency, d. c. voltage signal input transformation
The armature winding 152 of device 15 is exported by the secondary windings 151 of transformer 15 to light source.153 coupling of auxiliary winding of transformer 15
Connection control circuit 14 protects control circuit by flyback principle.
The ripple amplitude that driving circuit 10 is exported in the voltage signal to light source is relatively low, and frequency is high frequency, more than human eye
The sentient frequency of institute so that the light fluctuating range and vibration frequency of light source make user not noticeable, improve making for user
Use perception.
By foregoing description, the present embodiment is exported by booster circuit burning voltage signal by control circuit
High-frequency controling signal controls the working condition of booster circuit so that the vibration frequency of voltage signal becomes high frequency so that the first electricity
The ripple amplitude that appearance generates is relatively low and frequency is high frequency, and the light fluctuating range of the light source of such driving circuit driving becomes smaller, ripple
Dynamic frequency is more than appreciable frequency, allows user that can not discover source light fluctuation, improves user's perception.
Referring to Fig. 2, Fig. 2 is the circuit diagram of the first embodiment of lighting system provided by the invention.Driving circuit
30 include booster circuit 31, control circuit 32, filter rectifier 33, the first capacitance C1, transformer TM1, second resistance R2.Filter
Ripple rectification circuit 33 includes full-wave bridge and the second capacitance C2.The equal incoming transport electricity of two input terminals of full-wave bridge
Pressure, ground terminal ground connection, DC voltage of the output terminal output through over commutation, one end coupling full-wave bridge of the second capacitance C2
Output terminal, other end ground connection carry out rectification to the DC voltage of full-wave bridge output, stabilize it.
Booster circuit 31 includes inductance L1, the first diode D1, first switch pipe QM1 and first resistor R1.Inductance L1's
One end is the input terminal of booster circuit 31, couples the output terminal of filter rectifier 33, receives the d. c. voltage signal of its output.
The other end of the anode coupling inductance L1 of first diode D1, the cathode of the first diode D1 is the output terminal of booster circuit 31.
The drain electrode of first switch pipe QM1 is coupled between inductance L1 and the first diode D1, the source electrode ground connection of first switch pipe QM1, the
The grid of one switching tube QM1 is the control terminal of booster circuit 31.In the present embodiment, the first capacitance C1 is polar capacitor, the
The output terminal i.e. cathode of the first diode D1 of the anode coupling booster circuit of one capacitance C1, the cathode ground connection of the first capacitance C1.
In other embodiments, the first capacitance C1 can also be non-polar capacitor.
Control circuit 32 includes PWM IC chips and second switch pipe QM2.The drain electrode coupling transformer of second switch pipe QM2
The armature winding of TM1, the door end of grid coupling PWM IC circuits, source electrode ground connection.Power access end (VCC) coupling of PWM IC chips
Meet the auxiliary winding of transformer TM1, voltage detecting end (VSENSE) ground connection, current detecting end (IS) coupling second switch pipe QM2
Source electrode.The control terminal of control circuit 32 is the door end of PWM IC chips, and the grid of coupling first switch pipe QM1 is also
The control terminal of booster circuit 31.The grid of one end coupling first switch pipe QM1 of first resistor R1, the other end of first resistor R1
Couple the source electrode of first switch pipe QM1.
In this implement scene, in order to further protect circuit safety, control circuit further includes：3rd resistor R3, the 4th
Resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 3rd capacitance C3 and the second diode D2.
The door end of one end coupling control chip of 3rd resistor R3, the other end couple the grid of the second switch pipe, the 4th electricity
The current detecting end of one end coupling control chip of R4 is hindered, the other end couples the source electrode of the second switch pipe, the 5th electricity
The one end for hindering R5 couples the source electrode of the second switch pipe, other end ground connection, and one end of the 6th resistance R6 couples the control core
The power input of piece, the other end couple the auxiliary winding of the transformer, and one end of the 3rd capacitance C3 couples the control core
The power input of piece, other end ground connection, the power input of the cathode coupling control chip of the second diode D2, anode
Couple the transformer auxiliary winding, one end of the 7th resistance R7 couples the anode of second diode, described in the coupling of one end
Control the voltage detecting end of chip, the voltage detecting end of one end coupling control chip of the 8th resistance R8, the other end
Ground connection.These resistance are connected in circuit, and for the size of electric current in limiting circuit, the second diode D2 is used to prevent that electric current is anti-
To, the 3rd capacitance C3 for preventing the Current Voltage in circuit from issuing licence acute variation, the safety of circuit is protected.
The door end of control terminal, that is, PWM IC chips of one end coupling control circuit 32 of second resistance R2, second resistance R2's
The grid of control terminal, that is, first switch pipe QM1 of other end coupling booster circuit 31.The output terminal of booster circuit 31, that is, inductance L1
The other end by transformer TM1 optical light sources, wherein, the output terminal of the armature winding of transformer TM1 coupling booster circuit 31,
Secondary windings optical light source.In the present embodiment, light source is LED light source, in other embodiments or other forms
Light source, such as fluorescent lamp etc..The armature winding of transformer TM1 couples the output terminal of the booster circuit 31, secondary windings coupling
Light source, the second end ground connection of secondary windings.The power access end and prison of the PWM IC chips of auxiliary winding coupling control circuit 32
Control sampling voltage input terminal.
As shown in Figure 2, ac voltage signal becomes d. c. voltage signal after the processing of filtered rectification circuit 33, passes
It is defeated to arrive booster circuit 31.High-frequency signal control booster circuit 31 of 321 output frequency of control terminal of control circuit 32 more than 50KHz
In first switch pipe QM1 shut-off and conducting.When the control terminal 321 of control circuit 32 exports high level signal to first switch
During the grid of pipe QM1, first switch pipe QM1 conductings, the voltage signal by the second preliminary voltage stabilizings of capacitance C2 flows through inductance L1, electricity
Feel L1 storage electric energy.When the control terminal 321 of control circuit 32 export low level signal to first switch pipe QM1 grid when,
One switching tube QM1 is turned off, and inductance L1 starts to discharge, the voltage signal in stabilizing circuit.First diode D1 coupling inductance L1's
The voltage signal exported to inductance L1 is carried out voltage stabilizing, while can prevent the first capacitance C1 from discharging by the other end.First capacitance C1
When carrying out voltage stabilizing to voltage signal, because voltage signal has already passed through the voltage stabilizing of booster circuit 31, the ripple width generated
It spends relatively low.And voltage signal passes through control circuit 33 and the collective effect of booster circuit 31, the frequency of fluctuation is high frequency, therefore the
The ripple frequency that one capacitance C1 is generated is also high frequency.First resistor R1 is for preventing first switch pipe QM1 from misleading, second resistance
R2 reduces the EMI (Electro-Magnetic Interference, electromagnetic interference) in circuit for protecting circuit.
Carry the ripple of frequency low-amplitude degree voltage signal be transferred to transformer TM1 armature winding first end,
The output terminal of the armature winding of the drain electrode coupling transformer TM1 of two switching tube QM2, second switch pipe QM2 grids coupling first are opened
The grid of pipe QM1 namely coupling control chip door end are closed, therefore the shut-off of second switch pipe QM2 and first switch pipe QM1 is with leading
Logical is synchronous, therefore the voltage signal frequency of the armature winding input of transformer TM1 is and chip door end is controlled to control electricity
The control signal frequency of the control terminal output on road 32 is consistent.The secondary windings of transformer TM1 is exported to the voltage letter of light source
The frequency of ripple is also high frequency in number, therefore the light change frequency of light source is higher than the frequency that human eye can be differentiated, and voltage is believed
Number voltage stabilizing process through overdrive voltage, fluctuating range reduce, and source light strength fluctuation amplitude also reduces, and improve light source illumination
In stroboscopic phenomenon, user is not noticeable.
By foregoing description, the present embodiment carries out preliminary voltage stabilizing by the second capacitance to the voltage signal of input,
Enhance the voltage regulation result of driving circuit, carry out voltage stabilizing by using the voltage signal in inductance and capacitance on circuit, pass through control
The control signal of circuit output high frequency so that the voltage signal vibration frequency that driving circuit exports is also high frequency, and driven circuit is defeated
The light vibration frequency for the light source that the voltage signal gone out is lighted is also high frequency, and high frequency is carried by treated by transformer
The voltage signal output of the ripple of low amplitude is given to light source so that the light intensity fluctuating range that light source is sent reduces, and fluctuates
Frequency is high frequency, and user is not noticeable, improves the stroboscopic phenomenon in light source illumination, improves user and uses perception.
The prior art is different from, the present invention is by booster circuit burning voltage signal, the high frequency exported by control circuit
Control signal controls the working condition of booster circuit so that the vibration frequency of voltage signal becomes high frequency, steady by the first capacitance
During pressure, the amplitude for the ripple that the first capacitance generates is relatively low, and frequency is high frequency, this is carried frequency low-amplitude degree line by transformer
The voltage signal of ripple is transferred to light source so that exports the light intensity fluctuating range sent to light source and becomes smaller, vibration frequency is more than
Appreciable frequency allows the not noticeable source light of user to fluctuate, and improves the stroboscopic phenomenon in light source illumination, improves user and sees
Sense.
The foregoing is merely embodiments of the present invention, are not intended to limit the scope of the invention, every to utilize this
It is relevant to be directly or indirectly used in other for the equivalent structure or equivalent flow shift that description of the invention and accompanying drawing content are made
Technical field is included within the scope of the present invention.
Claims (10)
1. a kind of driving circuit, which is characterized in that including：
Current rectifying and wave filtering circuit, it is direct current that the current rectifying and wave filtering circuit, which is used for the AC conversion that will be inputted,；
Booster circuit, the input terminal of the booster circuit couple the current rectifying and wave filtering circuit；
First capacitance, the first end of first capacitance are coupled to the output terminal of the booster circuit, second end ground connection；
Control circuit, the control terminal of the control circuit couple the control terminal of the booster circuit, are exported to the booster circuit
Control signal, the frequency of the control signal are more than setpoint frequency；
Transformer, the transformer secondary output winding couple light source to be driven, and armature winding couples the booster circuit, auxiliary winding
Couple the control circuit.
2. driving circuit according to claim 1, which is characterized in that the booster circuit includes：
Inductance, one end of the inductance couple the output terminal of the current rectifying and wave filtering circuit；
First diode, the anode of first diode couple the other end of the inductance, the cathode of first diode
Connect the first end of first capacitance；
First switch pipe, the drain electrode of the first switch pipe couple the anode of first diode, the first switch pipe
Source electrode is grounded, the grid coupling control circuit of the first switch pipe.
3. driving circuit according to claim 2, which is characterized in that the booster circuit further includes：
First resistor, one end of the first resistor couple the grid of the first switch pipe, the other end of the first resistor
Couple the source electrode of the first switch pipe.
4. driving circuit according to claim 1, which is characterized in that the current rectifying and wave filtering circuit includes：
Full-wave bridge, the output terminal of the full-wave bridge couple one end of the inductance；
Second capacitance, one end of second capacitance couple the output terminal of the full-wave bridge, second capacitance it is another
One end is grounded.
5. driving circuit according to claim 1, which is characterized in that the driving circuit further includes
Second resistance, one end of the second resistance couple the control terminal of the control circuit, the other end of the second resistance
Couple the input terminal of the booster circuit.
6. driving circuit according to claim 1, which is characterized in that
First capacitance is polar capacitor, and the anode of first capacitance couples the output terminal of the booster circuit, described the
The cathode ground connection of one capacitance.
7. driving circuit according to claim 1, which is characterized in that
The setpoint frequency is more than 50kHz.
8. driving circuit according to claim 1, which is characterized in that the control circuit includes：Control chip and second
Switching tube；
Wherein, the door end of the control chip couples the control terminal of the booster circuit, power access end couples the transformer
Auxiliary winding, voltage detecting end ground connection, current detecting end ground connection；
The drain electrode of the second switch pipe couple the armature winding of the transformer, the grid coupling control chip door end,
Source electrode is grounded.
9. driving circuit according to claim 8, which is characterized in that the control circuit further includes：
3rd resistor, the door end of 3rd resistor one end coupling control chip, the other end couple the second switch pipe
Grid；
4th resistance, the current detecting end of the 4th resistance one end coupling control chip, other end coupling described second
The source electrode of switching tube；
5th resistance, described 5th resistance one end couple the source electrode of the second switch pipe, other end ground connection
6th resistance, the power input of the 6th resistance one end coupling control chip, the other end couple the transformation
The auxiliary winding of device；
3rd capacitance, the power input of the 3rd capacitance one end coupling control chip, other end ground connection；
Second diode, the power input of the second diode cathode coupling control chip, anode couple the change
Depressor auxiliary winding；
7th resistance, described 7th resistance one end couple the anode of second diode, one end coupling control chip
Voltage detecting end；
8th resistance, the voltage detecting end of the 8th resistance one end coupling control chip, other end ground connection.
10. a kind of lighting system, which is characterized in that driving circuit and light source including light source and as described in claim 1-9, institute
Driving circuit is stated for the light source to be driven to be illuminated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711498339.9A CN108055733A (en) | 2017-12-29 | 2017-12-29 | A kind of driving circuit and lighting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711498339.9A CN108055733A (en) | 2017-12-29 | 2017-12-29 | A kind of driving circuit and lighting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108055733A true CN108055733A (en) | 2018-05-18 |
Family
ID=62125989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711498339.9A Pending CN108055733A (en) | 2017-12-29 | 2017-12-29 | A kind of driving circuit and lighting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108055733A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108601186A (en) * | 2018-06-26 | 2018-09-28 | 深圳市同洁科技有限公司 | A kind of lamp tube drive circuit |
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Application publication date: 20180518 |