CN106793348B - Multifunctional LED dims Dolby circuit and LED dimming power sources - Google Patents
Multifunctional LED dims Dolby circuit and LED dimming power sources Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The present invention relates to electronic circuit fields.The invention discloses a kind of Multifunctional LED Dolby circuits, including a time control unit, one resistance value gradual change Delayed conducting unit of resistance unit more than one and the resistance value gradual change for making more resistance units, the resistance value gradual change Delayed conducting unit includes a semiconductor switch and a capacitor charging unit, capacitor charging unit connection controls the conducting of the semiconductor switch, the capacitor charging unit input terminal is connected to the current output terminal of the time control unit, make the semiconductor switch conducts after being charged to the conducting voltage of the semiconductor switch, to make the overall electrical resistance in more resistance units become smaller.The invention also discloses a kind of LED dimming power sources.Present invention reduces the light modulation noises of LED light, and improve the dimming effect of traditional dimmers, expand the versatility of traditional dimmers, have broadened the low intensity range of LED light, have realized that traditional dimmers are substantially entirely compatible with extraordinary effect.
Description
Technical field
The invention belongs to electronic circuit fields, relate generally to the LED light modulation drivings (power supply) of exchange (AC) controllable silicon light modulation,
Dolby circuit and LED dimming power sources are dimmed more particularly to a kind of Multifunctional LED.
Background technology
The plug-type AC dimmer shapes of series connection currently used for illumination light modulation are different, broad categories：By purposes point, have specially
Door is directed to the Novel light modulator of LED light, also there is the traditional dimmers for adjusting incandescent lamp；By dimmer output waveform point, have preceding cut type,
Cut type afterwards, or even also have middle cut type；By dimmed power point, there are 0-300W, 0-600W, 10-400W, 40-800W ...；It presses
The control principle of light modulator point has simple capacitance-resistance delay open form light modulator (preceding cut type) and has accurate IC delays pass type light modulator
(rear cut type)；By switching tube type point：Have silicon-controlled, there is field-effect tube；By regulation and control method point, have mechanical potentiometer rotation or
Push-and-pull, also there is the touch or pressing of electronic induction.In addition, also part intelligent light regulator, when bearing power is less than 10W, load
It is non-linear serious when, can also automatically cut off output, it be according to designed the characteristics of incandescent lamp full intelligent protection light modulation
Device, this " defencive function ", for dimming LED lamp, this light modulator is easy accidentally to protect, into without output state, to shadow
Ring the normal light modulation of LED light.
Now most incandescent lamps that previous majority 25-100W can be replaced as long as the LED light of 3-16W, power is small, light
Effect height is originally meddlesome, but to so complicated AC light modulators, in face of power and is linearly all not easy with traditional dimmers matched
How LED light allows above-mentioned various traditional dimmers that can generally be adapted to dimming LED lamp, is that design LED light modulation drivings have to face
To problem.So at least 3 points of LED light modulations driving will solve：First, LED light power is small, to be adapted to by circuit compensation
The problem of part light modulator is linear bad after not starting or starting, unstable, flicker；Second is that light modulator output 100Hz (or
120Hz) the LED drivings noise problem caused by low-frequency pulse will solve；Third, traditional incandescent lamp is in light modulator output power
It does not just work substantially when being 25%, and LED light still has 10% brightness in light modulator output 10%, therefore, LED drivings
Should have low side widening circuit (it is a little power tune can be obtained smaller), otherwise can feel the dimming scope of LED light is too small, brightness tune not
Secretly, power tune is not small ..., it is seen that the light modulation driving of LED light will not only solve the nonlinear problem of Switching Power Supply, and solve
Certainly a series of problems, such as startup, linear, broadening, noise reduction, flicker, ripple.
Wherein noise problem is most prominent, and nobody can like the big LED light of noise, meanwhile, dimming behavior is also critically important.Cause
This provide it is a kind of increase on Dolby circuit start, be linear, broadening, the anti-circuit for the functions such as dodging then seem and are highly desirable.
Invention content
It is an object of the invention to provide a kind of with silicon-controlled 100Hz (120Hz) arteries and veins of reduction in order to solve the above problem
Rush of current noise is rushed, the light modulation depth of LED low-light levels is broadened, the light modulation for promoting traditional dimmers is linear, compatible and stable
Property etc. functions LED light modulation Dolby circuits and LED dimming power sources.
For this purpose, the invention discloses a kind of Multifunctional LED Dolby circuits, including time control unit is (hereinafter referred to as：Time control
Unit), resistance unit more than one and make a resistance value gradual change Delayed conducting unit (letter that the resistance value of more resistance units changes
Claim：Gradually lead to unit), time control unit can generate an electric current for loading on its current output terminal, and it includes one that this, which gradually leads to unit,
A semiconductor switch and a capacitor charging unit, the capacitor charging unit connection control the semiconductor switch resistance value gradual change with
Delayed conducting, the capacitor charging unit input terminal are connected to the current output terminal of the time control unit, and the voltage value of the capacitance determines
The working condition of connected semiconductor switch (resistance from large to small, until fully on), to keep constant-current switch power source electric
The power source supplying voltage that road is obtained is become larger by small, rather than is become larger suddenly, and noise has then been suppressed.Meanwhile prolonging
When be connected, so that the power-on time of constant-current switch power source is shortened, to expand light modulation depth when LED low-light levels, gradual change makes friendship
Stream supply current will not be mutated, and the conducting of light modulator becomes easy stabilization, and then the compatibility of light modulator greatly improves, EMC
Improve.
Further, more resistance units and gradually lead to unit include resistance Rn1, resistance Rn2, transistor switch Qn and electricity
Hold Cn1, the resistance Rn2 and transistor switch Qn series connection it is in parallel with resistance Rn1 again after, both ends are respectively the Multifunctional LED
First connecting pin of Dolby circuit and second connection end, first the first connecting pin of termination of the capacitance Cn1, second end connect respectively
The control terminal of transistor switch Qn and the current output terminal of time control unit.
Further, more resistance units and gradually lead to unit include resistance Rn1, resistance Rn2, transistor switch Qn and electricity
Hold Cn1, after the resistance Rn2 and transistor switch Qn parallel connections are connected with resistance Rn1 again, both ends are respectively the Multifunctional LED
First connecting pin of Dolby circuit and second connection end, first the first connecting pin of termination of the capacitance Cn1, second end connect respectively
The control terminal of transistor switch Qn and the current output terminal of time control unit.
Further, the transistor switch Qn is metal-oxide-semiconductor.
Further, the time control unit is made of control chip U2, diode Dn2 and resistance Rn4, the control chip
Current output terminal the forward direction series diode Dn2 and resistance Rn4 of U2 connect the second end of capacitance Cn1.
Further, the time control unit by transformer T1 in constant current switch power circuit auxiliary winding N2, diode
Dn2 and resistance Rn4 compositions, the anode of one end connection diode Dn2 of the auxiliary winding N2, other end ground connection, diode
The cathode of Dn2 is connect with one end of resistance Rn4, the second end of another termination capacitor Cn1 of resistance Rn4.
The invention also discloses a kind of LED dimming power sources, including current rectifying and wave filtering circuit, constant current switch power circuit and above-mentioned
Multifunctional LED Dolby circuit, the current rectifying and wave filtering circuit input termination light modulator output end, the current rectifying and wave filtering circuit
Output termination constant current switch power circuit input terminal, the first connecting pin of the Multifunctional LED Dolby circuit and second connect
It connects end to be serially connected in the circuit of current rectifying and wave filtering circuit, and is changed according to the time control unit and be serially connected in the current rectifying and wave filtering circuit
The resistance value in circuit, to extend the rising time of current rectifying and wave filtering circuit output current.
The advantageous effects of the present invention：
Present invention reduces the light modulation noises of LED light, and improve the dimming effect of traditional dimmers, expand traditional tune
The versatility of light device, and be also greatly reduced conduction and the radiation interference of power supply, make EMC more easily by.With the present invention
The light-adjustable LED lamp of circuit had not only been suitable for New LED light modulator, but also was suitable for conventional incandescent light organ, was especially reducing
The AC noise of driver, the power adjustable range for broadening LED light realize that traditional dimmers are substantially entirely compatible with extraordinary
Effect to be conducive to the standardization of products of light-adjustable LED lamp, and then reduces production, inventory, the circulation etc. of light-adjustable LED lamp
Cost, and significantly promote the dimming effect of LED light.
Description of the drawings
Fig. 1 is the circuit diagram of the embodiment of the present invention one；
Fig. 2 is the circuit diagram of the embodiment of the present invention two；
Fig. 3 is another circuit diagram of the Multifunctional LED Dolby circuit of the present invention.
Specific implementation mode
In conjunction with the drawings and specific embodiments, the present invention is further described.
The Multifunctional LED Dolby circuit of the present invention is applied in LED dimming power sources, to reach noise reduction, light modulation, low
The functions such as brightness broadening will be described in detail by taking the LED dimming power sources of the Multifunctional LED Dolby circuit with the present invention as an example below
The present invention.
Embodiment one
As shown in Figure 1, a kind of LED dimming power sources, including current rectifying and wave filtering circuit 1, constant current switch power circuit 2 and multi-functional
LED Dolby circuits 3, the current rectifying and wave filtering circuit 1 input termination light modulator output end, the current rectifying and wave filtering circuit 1 it is defeated
Go out to terminate the input terminal of constant current switch power circuit 2, the Multifunctional LED Dolby circuit 3 is serially connected in returning for current rectifying and wave filtering circuit 1
Lu Zhong, and change according to time control unit the resistance value in the circuit for being serially connected in the current rectifying and wave filtering circuit 1, to extend rectifying and wave-filtering electricity
The rising time of 1 output current of road dims noise to reduce LED, while having broadened the low intensity range of light modulation.
Specifically, the Multifunctional LED Dolby circuit 3 includes a time control unit, resistance unit more than one and keeps this more
One of the resistance value change of resistance unit gradually leads to unit, and time control unit can generate an electricity for loading on its current output terminal
Stream, it includes a semiconductor switch and a capacitor charging unit that this, which gradually leads to unit, which is connected to
The current output terminal of the time control unit makes the semiconductor switch resistance value gradually become after being charged to the conducting voltage of the semiconductor switch
It is small until conducting, to make the overall electrical resistance in more resistance units from large to small until the semiconductor switch it is fully on.
In this specific embodiment, more resistance units and gradually lead to unit include resistance Rn1, resistance Rn2, transistor switch Qn and
Capacitance Cn1, wherein transistor switch Qn is preferably metal-oxide-semiconductor, certainly, in other embodiments, can also be triode etc. other
Switching tube, time control unit are made of the auxiliary winding N2 of transformer T1 in constant current switch power circuit 2, and current rectifying and wave filtering circuit 1 wraps
Include inductance L1, inductance L2, rectifier bridge Br1, capacitance C1, capacitance C2, capacitance C3, capacitance Cz1 and resistance Rz1, constant-current switch power source
Circuit 2 includes transformer T1, metal-oxide-semiconductor Qk and control chip U1.An input terminal of rectifier bridge Br1 is sequentially connected in series inductance L1, insurance
Silk F1 and light modulator meet the ends the L acL of AC power, the N-terminal acN, capacitance C1 of another input termination AC power of rectifier bridge Br1
The N-terminal acN of one termination AC power, another to terminate on the node between inductance L1 and fuse F1, the output of rectifier bridge Br1
Anode is sequentially connected in series inductance L2, the primary side winding N1 of transformer T1, metal-oxide-semiconductor Qk and resistance Rs ground connection, the secondary side of transformer T1 around
The first end of group N3 directly connects an input terminal of load LED lamp, the second end forward direction series connection two of the vice-side winding N3 of transformer T1
Pole pipe D31 connects another input terminal of load LED lamp, and capacitance C31 is connected on the vice-side winding of the negative terminal and transformer T1 of diode D31
Between the first end of N3, the grid of metal-oxide-semiconductor Qk connects the control output end of control chip U1, and the power supply of control chip U1 terminates at electricity
Feel on the node between L2 and transformer T1, capacitance C3 is connected between the node and ground between inductance L2 and transformer T1, capacitance
Cz1 and resistance Rz1 series connection is in parallel with capacitance C2 again to be followed by between the output cathode and ground of rectifier bridge Br1, resistance Rn2 and MOS
Pipe Qn series connection is in parallel with resistance Rn1 again to be followed by between the output negative pole and ground of rectifier bridge Br1, and the first termination of capacitance Cn1 is whole
The output negative pole of bridge Br1, the grid of the second termination metal-oxide-semiconductor Qn are flowed, one end of auxiliary winding N2 is grounded, and the other end is sequentially connected in series just
Connect the second end of capacitance Cn1 to diode Dn2 and resistance Rn4, resistance Rn3 and zener diode Dn1 respectively with capacitance Cn1 simultaneously
Connection.
Operation principle：
One, noise reduction process：When dimmer output voltage moment, pass through inductance L1, resistance Rn1, capacitance C2, inductance L2, electricity
Hold the buffering and absorption, the especially buffering of resistance Rn1 of C3, the resistance value of resistance Rn1 is larger, generally 1K Ω or so, capacitance C3
Rate of voltage rise it is slower, constant current switch power circuit 2 usually has the limitation of maximum turn-on time, i.e., metal-oxide-semiconductor Qk's is wide
Turn-on time so that the electric current of transformer T1 primary side windings N1 can gradually rising because of the voltage Vc at the both ends capacitance C3, and gradually
High current also gradually increases to the electric current of vice-side winding N3, and the electric current that load LED lamp obtains just gradually increases and gradually increases
It is bright.Meanwhile auxiliary winding N2 has voltage, charges to capacitance Cn1 through diode Dn2, resistance Rn4, with the both ends capacitance Cn1 electricity
Pressure is stepped up, and metal-oxide-semiconductor Qn then also begins to gradually be connected, through resistance Rn2 current limlitings, charging electricity of the metal-oxide-semiconductor Qn to capacitance C3
Stream gradually increases, and until metal-oxide-semiconductor Qk works, several all (such as 5 weeks) metal-oxide-semiconductor Qn enters fully on state afterwards, prevents metal-oxide-semiconductor Qn
Excessive with the loss of resistance Rn1, to complete to power moment to LED dimming power sources in light modulator, the electric current of transformer T1 will not
Increase suddenly, but in preceding several all gradually high currents, running current is entered back into later, to reach noise reduction purpose.
The total insertion loss ＜ 1.5% of general metal-oxide-semiconductor Qn and its Dolby circuit influence the efficiency of circuit with the metal-oxide-semiconductor of very little
Less, it is also not high to increase cost.
Two, linear low-light level spreading process：Traditional dimmers are originally for incandescent lamp, it will be appreciated that when incandescent lamp
When acquisition power is only the 1/4 of its nominal power, its power, which is substantially all, becomes heat, without what brightness, if adjusted
The adjustable range of light device design is too big, and adjusting feel is bad instead, linear poor, but it is dimmed for LED, and situation is just different
, the luminous of LED is that brightness is substantially directly proportional to its driving current, even if its brightness of only 1/10 electric current
Have 1/10, therefore, if can will can only turn down to 1/3 common light modulator, broadens to 1/5, even 1/10, this is most use
What family was expected, and it is desirable that its spreading process is linearly gradually to broaden, rather than broadening suddenly, otherwise adjust feel not
Good, linear adjustment is also very poor.The operation principle of this circuit is：It is gradually connected by the delay of metal-oxide-semiconductor Qn so that filtered through over commutation
The power that wave circuit 1 is output to constant current switch power circuit is less than the power that light modulator exports, to realize that power is turned down,
Achieve the purpose that broaden low intensity range.For example, it is assumed that when light modulator output power is the 1/4 of its nominal power, frequency is
100Hz, then each output time of light modulator is the 1/4 of 10 milliseconds, i.e., 2.5 milliseconds, is led when metal-oxide-semiconductor Qn is delayed 1.25 milliseconds
Logical, then it is 1.25 milliseconds that each output time of current rectifying and wave filtering circuit 1, which drops to, that is, is effectively outputed to the voltage of constant-current switch power source
Pulse width is only the 1/2 of light modulator voltage pulse output width, if 2 milliseconds of conductings of delay, actual output voltage pulsewidth
Only the 1/5 of dimmer output voltage pulsewidth, to realize the broadening of linear low-light level because auxiliary winding N2 voltages be with
Sinusoidal impulse after AC rectifications is directly proportional, and voltage is lower, and charging rate is slower, thus can realize the mesh of Linear expansion automatically
's.By controlling the Delayed conducting time of metal-oxide-semiconductor Qn, then the range of linear low-light level broadening can be adjusted.
Embodiment two
The difference between this embodiment and the first embodiment lies in：Time control unit is made of control chip U2, the electricity of control chip U2
Stream output end forward direction series diode Dn2 and resistance Rn4 connect the second end of capacitance Cn1, and the power supply of control chip U2 terminates at electricity
Feel on the node between L2 and transformer T1.Its course of work is referred to embodiment one, this is no longer described in detail.By controlling chip
U2 can accurately control the size of capacitance Cn1 charging currents, to accurately control the rising time of transformer T1 electric currents, have
More preferable noise reduction, and broadening low intensity range can be accurately controlled, there is better broadening effect.
Certainly, in other embodiments, Multifunctional LED Dolby circuit 3 can also use other circuit structures, such as Fig. 3
Shown, resistance Rn2 and metal-oxide-semiconductor Qn parallel connections connect with resistance Rn1 be followed by between the output negative pole and ground of rectifier bridge Br1 again, electricity
Hold the output negative pole of the first termination rectifier bridge Br1 of Cn1, the grid of the second termination metal-oxide-semiconductor Qn, while connecing the electricity of control current source
Output end is flowed, resistance Rn3 is in parallel with capacitance Cn1 respectively with zener diode Dn1.
Present invention reduces the light modulation noises of LED light, and improve the dimming effect of traditional dimmers, expand traditional tune
The versatility of light device, and be also greatly reduced conduction and the radiation interference of power supply, make EMC more easily by.With the present invention
The light-adjustable LED lamp of circuit had not only been suitable for New LED light modulator, but also was suitable for conventional incandescent light organ, was especially reducing
The AC noise of driver, the low intensity range for broadening LED light realize that traditional dimmers are substantially entirely compatible with extraordinary effect
Fruit, to be conducive to the standardization of products of light-adjustable LED lamp, and then the costs such as production, inventory, circulation for reducing LED light, and it is big
Amplitude promotes the dimming effect of LED light.
Certainly, it will be appreciated by those skilled in the art that, Multifunctional LED Dolby circuit 3 of the invention can be used for it
Its LED dimming power sources, to reach the functions such as noise reduction, light modulation, low-light level broadening.
Although specifically showing and describing the present invention in conjunction with preferred embodiment, those skilled in the art should be bright
In vain, it is not departing from the spirit and scope of the present invention defined by the appended claims, it in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (7)
1. Multifunctional LED Dolby circuit, it is characterised in that：Including a time control unit, resistance unit more than one and make this
The resistance value gradual change Delayed conducting unit that the resistance value of more resistance units changes, time control unit can generate one and load on it
The electric current of current output terminal, the resistance value gradual change Delayed conducting unit include a semiconductor switch and a capacitor charging unit,
Capacitor charging unit connection controls the conducting of the semiconductor switch, which is connected to the time control
The current output terminal of unit makes the semiconductor switch conducts after being charged to the conducting voltage of the semiconductor switch, to keep this more
Overall electrical resistance in resistance unit becomes smaller.
2. Multifunctional LED Dolby circuit according to claim 1, it is characterised in that：More resistance units and resistance value are gradually
It includes that resistance Rn1, resistance Rn2, transistor switch Qn and capacitance Cn1, the resistance Rn2 and transistor are opened to become Delayed conducting unit
Close Qn series connection it is in parallel with resistance Rn1 again after, both ends are respectively that the first connecting pin of the Multifunctional LED Dolby circuit and second connect
End, first the first connecting pin of termination of the capacitance Cn1 are connect, second end connects control terminal and the time control of transistor switch Qn respectively
The current output terminal of unit processed.
3. Multifunctional LED Dolby circuit according to claim 1, it is characterised in that：More resistance units and resistance value are gradually
It includes that resistance Rn1, resistance Rn2, transistor switch Qn and capacitance Cn1, the resistance Rn2 and transistor are opened to become Delayed conducting unit
After pass Qn parallel connections are connected with resistance Rn1 again, both ends are respectively that the first connecting pin of the Multifunctional LED Dolby circuit and second connect
End, first the first connecting pin of termination of the capacitance Cn1 are connect, second end connects control terminal and the time control of transistor switch Qn respectively
The current output terminal of unit processed.
4. Multifunctional LED Dolby circuit according to claim 2 or 3, it is characterised in that：The transistor switch Qn is
Metal-oxide-semiconductor.
5. Multifunctional LED Dolby circuit according to claim 2 or 3, it is characterised in that：The time control unit is by controlling
Coremaking piece U2, diode Dn2 and resistance Rn4 composition, the current output terminal forward direction series diode Dn2 of the control chip U2 and
Resistance Rn4 connects the second end of capacitance Cn1.
6. Multifunctional LED Dolby circuit according to claim 2 or 3, it is characterised in that：The time control unit is by perseverance
The auxiliary winding N2 of transformer T1, diode Dn2 and resistance Rn4 compositions in current switching power supply circuit, the auxiliary winding N2's
One end connection diode Dn2 anode, other end ground connection, the cathode of diode Dn2 connect with one end of resistance Rn4, resistance
The second end of another termination capacitor Cn1 of Rn4.
7.LED dimming power sources, it is characterised in that：Appoint including current rectifying and wave filtering circuit, constant current switch power circuit and claim 1-6
Multifunctional LED Dolby circuit described in meaning one, the output end of the input termination light modulator of the current rectifying and wave filtering circuit are described whole
Flow the input terminal of the output termination constant current switch power circuit of filter circuit, the first connection of the Multifunctional LED Dolby circuit
End and second connection end are serially connected in the circuit of current rectifying and wave filtering circuit, and changed according to the time control unit be serially connected in it is described
The resistance value in the circuit of current rectifying and wave filtering circuit, to extend the rising time of current rectifying and wave filtering circuit output current.
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| CN201710161249.4A CN106793348B (en) | 2017-03-17 | 2017-03-17 | Multifunctional LED dims Dolby circuit and LED dimming power sources |
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| TWI669985B (en) * | 2018-10-12 | 2019-08-21 | 力林科技股份有限公司 | Light emitting diode driving device and light emitting diode backlight module |
| US10616965B1 (en) * | 2019-05-29 | 2020-04-07 | B/E Aerospace, Inc. | Passive illumination ramping circuit |
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| CN105392256A (en) * | 2015-12-04 | 2016-03-09 | 佛山电器照明股份有限公司 | LED linear current-constant light modulation circuit |
| CN205610994U (en) * | 2016-04-20 | 2016-09-28 | 青岛华潞佳电子科技有限公司 | Novel LED light adjustment circuit |
| CN206542605U (en) * | 2017-03-17 | 2017-10-03 | 厦门方光电子科技有限公司 | Multifunctional LED dims Dolby circuit and LED dimming power sources |
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| CN106793348A (en) | 2017-05-31 |
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