CN107172766A - LED power-adjustables switch color-temperature regulating control drive circuit - Google Patents
LED power-adjustables switch color-temperature regulating control drive circuit Download PDFInfo
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- CN107172766A CN107172766A CN201710582106.0A CN201710582106A CN107172766A CN 107172766 A CN107172766 A CN 107172766A CN 201710582106 A CN201710582106 A CN 201710582106A CN 107172766 A CN107172766 A CN 107172766A
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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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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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]
Abstract
The invention discloses a kind of LED power-adjustables switch color-temperature regulating control drive circuit, including power module, two paths of LED lighting circuit and light adjusting circuit；The LED illumination includes LED lamp tube, resistance, electric capacity and inductance；Also include LED current setting module and LED open-circuit-protection modules; LED open-circuit-protections module, which includes regulation resistance R2, to be used to set the inductance minimum demagnetization time; the LED current setting module includes a regulation resistance R1; LED current setting module sets inductive current according to resistance R1 and regulation resistance R2 resistances; so as to adjust LED power; whole system only has a control chip; reduce peripheral circuit; system cost is saved; and the LED current in the case of colour mixture can be adjusted by external resistance.
Description
Technical field
The present invention relates to field of LED drive technology, and in particular to a kind of LED power-adjustables switch color-temperature regulating control driving electricity
Road.
Background technology
At present in LED switch toning temperature control system, 3 chip controls are all employed mostly, which includes two LEDs
Driving chip and a MCU.Patent such as Application No. 201310057625.7 discloses a kind of LED of tunable optical adjustable color temperature
Drive circuit, to drive the LED light device being made up of N paths of LEDs lamp strings, N >=2, including a buck type power stage circuits, one
Driving circuits and N number of gate-controlled switch；Wherein, each LED string and gate-controlled switch described in corresponding one, and
Fly-wheel diode in the buck types power stage circuit is connected in series in the power switch in the buck types power stage circuit
Between pipe and the public connecting end and a ground potential of outputting inductance；The driving circuits are according to the LED light device
Light modulation and color temperature information, to produce N+1 control signal, to control the power switch pipe respectively and N number of described controllable open
The switch motion of pass, it has been separately provided with MCU, complicated.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of, MCU control chips, and the LED of power adjustable need not be set
Color-temperature regulating controls drive circuit.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of LED power-adjustables switch color-temperature regulating
Control drive circuit, including power module, two paths of LED lighting circuit and light adjusting circuit；The LED illumination circuit includes LED
Fluorescent tube, resistance, electric capacity and inductance；The LED light adjusting circuits include channel selecting module, system control module, demagnetization time
Detection module, peak detection block and some high power metal-oxide-semiconductors；System control module controls LED by high power metal-oxide-semiconductor
Lighting circuit break-make, and connect peak detection block and demagnetization time detecting module；Time detecting of demagnetizing module connection LED illumination
Circuit and system control module, demagnetization time detecting module detection LED illumination circuit demagnetization signal, and pass through system control module
High power metal-oxide-semiconductor is opened, LED illumination circuit is magnetized；Peak detection block connects system control module and LED illumination electricity
Road, the peak point current for setting LED illumination circuit, and high power metal-oxide-semiconductor is closed by system control module, to LED illumination
Circuit is demagnetized, and channel selecting module sends control signal to system control module according to bus power-off signal, for illuminating
The selection of circuit, in addition to LED current setting module and LED open-circuit-protection modules, LED open-circuit-protections module include regulation electricity
Resistance R2 is used to set the inductance minimum demagnetization time, and the LED current setting module includes a regulation resistance R1, and LED current is set
Cover half root tuber sets inductive current according to resistance R1 and regulation resistance R2 resistances, so as to adjust LED power.
Further, the LED current setting module includes comparator, electric capacity CAP, capacitor charge and discharge unit and electric capacity
Charging control unit, the output end connection system control module of the comparator, electric capacity CAP one end connects the positive pole of comparator,
The other end is grounded, the negative pole connection reference voltage of comparator, when electric capacity CAP is discharged to the reference voltage of comparator, comparator production
Raw energizing signal is to system control module, and the charging current of capacitor charge and discharge unit is set by resistance R2, and discharge current is by resistance
R1 is set, and electric capacity CAP is switched to discharge condition by electric capacity charging control unit after lighting circuit demagnetization terminates from charged state.
Further, the electric capacity charging control unit includes NMOS tube and PMOS and the logic control that common gate is connected
Molding block；The output end connection NMOS tube and the grid of PMOS of the Logic control module, when lighting circuit demagnetization terminates
Afterwards, high level signal is sent, after electric capacity electric discharge terminates, low level signal is sent；The drain electrode of NMOS tube and the source electrode of PMOS
It is connected, the source electrode connection capacitor discharging circuit of NMOS tube, the drain electrode connection capacitor charging circuit of PMOS, capacitor charging circuit
Electric current is I2, and I2 is K times of electric current I1, and wherein I1 is the size of current by resistance R2, and the electric current of the electric circuit of electric capacity electric discharge is
I3, I3 electric current are J times of ISET electric currents, and wherein ISET is the size of current by resistance R1, electric capacity CAP connection NMOS tubes
Drain electrode or the source electrode of PMOS.
Further, the input of the Logic control module accesses two pulse signals, and one of them is that DRV drives letter
Number, waveform is identical with the drive waveforms of high power metal-oxide-semiconductor, and another is trigger signal, when lighting circuit demagnetization end sends height
Level triggers signal.
Further, the channel selecting module includes ULVO modules, gate time detection unit, bus detection of power loss list
Member and channel selection unit, the UVLO modules are used for the voltage up and down for setting LED illumination circuit to open and close, and prevent anti-
Multiple open and close；The power down of the connection of bus detection of power loss unit the UVLO modules and bus to busbar voltage is detected, is counted
Number time detecting units detection bus power down times, channel selection unit is according to the bus power down time of gate time detection unit
Signal is switched over to the control signal of system control module.
From above-mentioned technical proposal it can be seen that the present invention has advantages below：Whole system only has a control chip, subtracts
Few peripheral circuit, has saved system cost, and can adjust the LED current in the case of colour mixture by external resistance.
Brief description of the drawings
Fig. 1 is functional block diagram of the invention；
Fig. 2 is LED open-circuit-protection modules in the present invention；
Fig. 3 is the circuit theory diagrams of current settings module in the present invention；
Fig. 4 is the oscillogram of each signal in the present invention.
Embodiment
The embodiment of the present invention is elaborated below in conjunction with accompanying drawing.
As shown in figure 1, the LED power-adjustables switch color-temperature regulating control drive circuit of the present invention, including power module, two-way
LED illumination circuit and light adjusting circuit；The LED illumination circuit including LED lamp tube, resistance, electric capacity and inductance, LED lamp tube two
End is connected in parallel with a capacitor, resistance and inductance, and Schottky tube is provided between inductance and LED.Inductance passes through Schottky tube and LED
Fluorescent tube discharges, and this discharge time is the demagnetization time；Conversely, to magnetize the time.
The LED light adjusting circuits include channel selecting module, system control module, demagnetization time detecting module, peak value inspection
Survey module, LED current setting module, LED open-circuit-protections module and some high power metal-oxide-semiconductors.Bus is also connected with a 5V electricity
Generation module is pressed, is powered for the low-voltage module to internal system, equivalent to one linear voltage regulator.
System control module is two groups of independent switching channels, and LED illumination is controlled by opening and closing high power metal-oxide-semiconductor
Connecting and disconnecting of the circuit, and connect peak detection block and demagnetization time detecting module.
Time detecting of demagnetizing module connection LED illumination circuit and system control module, demagnetization time detecting module detection LED
Lighting circuit demagnetization signal, and high power metal-oxide-semiconductor is opened by system control module, LED illumination circuit is magnetized；Peak value
Detection module connection system control module and LED illumination circuit, the peak point current for setting LED illumination circuit, and by being
Control module of uniting closes high power metal-oxide-semiconductor, and LED illumination circuit is demagnetized.When inductive current is 0, then demagnetization terminates, now
The detection module that demagnetizes feeds back according to the signal of high-voltage MOS pipe grid, by system control module, opens high-voltage MOS pipe, works as grid
Voltage has reached reference voltage, then peak detection block closes high-voltage MOS pipe, and now system enters demagnetization detection state, such as
This is repeatedly.The structure of peak detection block includes two peakvalue's checking comparators, and the source electrode of two high-voltage MOS pipes is connected respectively,
After input input reference voltage (reference voltage of this chip is 0.4V, can also be other voltages), system electrification, MOS
The source voltage of pipe slowly rises, when reaching reference voltage, and peak comparator sends control signal to system control module, enters
And high-voltage MOS pipe is closed, now inductance starts demagnetization electric discharge, after demagnetization terminates, and demagnetization time detecting module opens high-pressure MOS
Pipe, so moves in circles.Peak detection block controls high pressure by setting reference voltage to adjust the peak value of inductive discharge
MOSFET closing, so as to control the peak point current of inductance, peak point current is set as that Ip=VREF/RCS, wherein VREF are inside
Reference voltage, RCS is the external sampling resistor of ISEN1 or ISEN2 ports, (general we set this resistance identical).
Channel selecting module includes ULVO modules, gate time detection unit, bus detection of power loss unit and passage choosing
Unit is selected, the UVLO modules are used for the voltage up and down for setting LED illumination circuit to open and close, prevent open and close repeatedly；
The power down of the connection of bus detection of power loss unit the UVLO modules and bus to busbar voltage detects that gate time detection is single
Member detection bus power down time, channel selection unit is according to the bus power down time signal of gate time detection unit to system control
The control signal of molding block is switched over.
LED open-circuit-protections module is as shown in Fig. 2 it is a base mainly to include V1 in comparator and operational amplifier, figure
Standard, inner setting is 0.5V, and V2 is also a benchmark, and inner setting is 2.5V, and DRV is drive signal, when MOFET conducting then,
Drag down comparator+end, when MOFET close then comparator+end start to charge up arrival V2 voltages, then comparator overturn, produce
One pulse signal, this signal width has the resistance sizes of resistance RADJ ports to determine, the width of this pulse signal is determined
The LED demagnetization time, so as to carry out overvoltage protection voltage to LED.
As shown in figures 1 and 3, LED current setting module include one regulation resistance R1, LED current setting module according to
Resistance R1 and regulation resistance R2 resistances set inductive current, so as to adjust LED power, regulation resistance R2 and resistance RADJ is same
Resistance.LED current setting module includes comparator, electric capacity CAP, capacitor charge and discharge unit and electric capacity charging control unit, institute
The output end connection system control module of comparator is stated, electric capacity CAP one end connects the positive pole of comparator, and other end ground connection is compared
The negative pole connection reference voltage of device, when electric capacity CAP is discharged to the reference voltage of comparator, comparator produces energizing signal to system
Control module, the charging current of capacitor charge and discharge unit is set by resistance R2, and discharge current is set by resistance R1, electric capacity charging control
Electric capacity CAP is switched to discharge condition by unit processed after lighting circuit demagnetization terminates from charged state.
Electric capacity charging control unit includes NMOS tube and PMOS and the Logic control module that common gate is connected；It is described to patrol
The output end connection NMOS tube of control module and the grid of PMOS are collected, after lighting circuit demagnetization terminates, high level is sent
Signal, after electric capacity electric discharge terminates, sends low level signal；The drain electrode of NMOS tube is connected with the source electrode of PMOS, NMOS tube
Source electrode connects capacitor discharging circuit, and the drain electrode of PMOS connects capacitor charging circuit, and the electric current of capacitor charging circuit is I2, and I2 is
K times of electric current I1, wherein I1 are the size of current by resistance R2, and the electric current of the electric circuit of electric capacity electric discharge is I3, and I3 electric current is
J times of ISET electric currents, wherein ISET are the size of current by resistance R1, the drain electrode of electric capacity CAP connection NMOS tubes or PMOS
The source electrode of pipe.
The input of Logic control module accesses two pulse signals, and one of them is DRV drive signals, waveform and Gao Gong
The drive waveforms of rate metal-oxide-semiconductor are identical, and another is trigger signal, when lighting circuit demagnetization end sends high trigger signal.
System Working Principle is as follows：Vdd voltage rises to UVLO upper voltage after system electrification, then system starts work
Make, now system default selector channel 1 (performance loop that DN1 and ISEN1 are formed) works, (DN2 the and ISEN2 institutes shape of passage 2
Into performance loop) close.LED corresponding to passage 1 is bright, and the LED corresponding to passage 2 is gone out.Now shut-off switch, and protecting
The time is held more than 75ms less than 5S, switch is reopened, then the LED corresponding to passage 1 is gone out, the LED corresponding to passage 2
It is bright.Now turn off switch again, and the retention time is more than 75ms and be less than 5S, then open switch, then corresponding to passage 1 and passage 2
LED all light.When passage 1 connects white light (gold-tinted).Passage 2 connects gold-tinted (white light), then white light is realized during switching,
Gold-tinted, colour mixture, or gold-tinted, white light, effect as colour mixture.
Colour mixture power-adjustable principle：Normal color-temperature regulating drive module, each passage is in the case of monochrome and colour mixture
In the case of, power will not change, that is to say, that A watts when in the case of monochromatic, then in the case of colour mixture be then 2*
A watts.This invention can then adjust the LED current in the case of colour mixture by adjusting RSET pin resistance, then can adjust colour mixture
Power.
In the case of single channel, system is worked under BCM patterns, and now the current waveform on inductance is as shown in Figure 1, then
LED current is exactly
It is of the invention then be the ratio by setting RSET pin resistance R1 and RADJ pin resistance R2, to adjust LED current
's.Specific calculation formula is as follows：
Wherein IADJ is set by the resistance R2 of RADJ pin, and ISET (is shown in system frame in detail by the resistance R1 settings of RSET pin
Figure).Proportional current is obtained by the ratio of current source, then I2=IADJ*N*K, I3=ISET*J.
Specific workflow is as described below：DRV drive signals, open the efferent duct of system, whole system is started work
Make, inductive current starts increase, now A points current potential is low potential, current source I2 charges to B point electric capacity CAP, when inductive current increases
The IP of setting is added to, then high pressure NMOS pipe is closed, system starts demagnetization, and now A points current potential is still low potential, I2 pairs of current source
B points electric capacity keeps charging.After system demagnetization terminates, now inductive current is 0, ZCD signal outputs, one high potential pulse, is made
The jump in potential of A points is high potential, then B points electric capacity starts electric discharge, and discharge current is I3, and now inductive current remains 0, when B points
Electric capacity is discharged to VREF current potentials, then comparator is overturn, and efferent duct high pressure NMOS is opened in the output high potential pulse of C points, then system is opened
Beginning reworks.So repeatedly.Each specific signal is shown in Fig. 4.
In Fig. 4, the waveform of inductive current, T1 time is TON+TOFF, and wherein TON is high pressure NMOS FET conducting
Time, TOFF is then the demagnetization time of inductance.T2 is the time that inductive current is 0, then the electric current of the LED exported is T1 is calculated, T2 time is as follows：
CAP×VCAP=I2 × T1=I3 × T2
I2=IADJ × N × K
I3=ISET × J
In the design, wherein N=K=J=1, VADJ=VSET.
Then calculate what is obtained
In the application, RADJ resistance can be first set, RADJ resistance is set by setting OVP voltages, then root again
RSET resistance is set according to required electric current.
Claims (5)
1. a kind of LED power-adjustables switch color-temperature regulating control drive circuit, including power module, two paths of LED lighting circuit and
Light adjusting circuit；The LED illumination circuit includes LED lamp tube, resistance, electric capacity and inductance；The LED light adjusting circuits include passage
Selecting module, system control module, demagnetization time detecting module, peak detection block and some high power metal-oxide-semiconductors；System
Control module connects peak detection block and the inspection of demagnetization time by controlling high power metal-oxide-semiconductor to control LED illumination connecting and disconnecting of the circuit
Survey module；Time detecting of demagnetizing module connection LED illumination circuit and system control module, demagnetization time detecting module detection LED
Lighting circuit demagnetization signal, and high power metal-oxide-semiconductor is opened by system control module, LED illumination circuit is magnetized；Peak value
Detection module connection system control module and LED illumination circuit, the peak point current for setting LED illumination circuit, and by being
Control module of uniting closes high power metal-oxide-semiconductor, LED illumination circuit is demagnetized, channel selecting module is according to bus power-off signal
Control signal is sent to system control module, the selection for lighting circuit, it is characterised in that：Also include LED current and set mould
Block and LED open-circuit-protection modules, LED open-circuit-protections module, which includes regulation resistance R2, to be used to set the inductance minimum demagnetization time,
The LED current setting module includes a regulation resistance R1, and LED current setting module hinders according to resistance R1 and regulation resistance R2
Value sets inductive current, so as to adjust LED power.
2. LED power-adjustables switch color-temperature regulating control drive circuit according to claim 1, it is characterised in that：The LED
Current settings module includes comparator, electric capacity CAP, capacitor charge and discharge unit and electric capacity charging control unit, the comparator
Output end connection system control module, electric capacity CAP one end connect comparator positive pole, the other end ground connection, the negative pole of comparator
Reference voltage is connected, when electric capacity CAP is discharged to the reference voltage of comparator, comparator produces energizing signal to system and controls mould
Block, the charging current of capacitor charge and discharge unit is set by resistance R2, and discharge current is set by resistance R1, electric capacity charging control unit
Electric capacity CAP is switched into discharge condition from charged state after lighting circuit demagnetization terminates.
3. LED power-adjustables switch color-temperature regulating control drive circuit according to claim 2, it is characterised in that：The electricity
Capacity charge control unit includes NMOS tube and PMOS and the Logic control module that common gate is connected；The Logic control module
Output end connection NMOS tube and PMOS grid, when lighting circuit demagnetization terminate after, high level signal is sent, in electric capacity
After electric discharge terminates, low level signal is sent；The drain electrode of NMOS tube is connected with the source electrode of PMOS, the source electrode connection electric capacity of NMOS tube
Discharge circuit, the drain electrode connection capacitor charging circuit of PMOS, the electric current of capacitor charging circuit is I2, and I2 is K times of electric current I1,
Wherein I1 is the size of current by resistance R2, and the electric current of the electric circuit of electric capacity electric discharge is I3, and I3 electric current is the J of ISET electric currents
Times, wherein ISET is the size of current by resistance R1, the drain electrode of electric capacity CAP connection NMOS tubes or the source electrode of PMOS.
4. LED power-adjustables switch color-temperature regulating control drive circuit according to claim 3, it is characterised in that：It is described to patrol
The input for collecting control module accesses two pulse signals, and one of them is DRV drive signals, waveform and high power metal-oxide-semiconductor
Drive waveforms are identical, and another is trigger signal, when lighting circuit demagnetization end sends high trigger signal.
5. LED power-adjustables switch color-temperature regulating control drive circuit according to claim 3, it is characterised in that：It is described logical
Road selecting module includes ULVO modules, gate time detection unit, bus detection of power loss unit and channel selection unit, described
UVLO modules are used for the voltage up and down for setting LED illumination circuit to open and close, and prevent open and close repeatedly；The bus power down
Detection unit connects the power down of UVLO modules and bus to busbar voltage and detected, gate time detection unit detection bus falls
Electric time, control of the channel selection unit according to the bus power down time signal of gate time detection unit to system control module
Signal is switched over.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710582106.0A CN107172766B (en) | 2017-07-17 | 2017-07-17 | LED power-adjustable switchs color-temperature regulating and controls driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710582106.0A CN107172766B (en) | 2017-07-17 | 2017-07-17 | LED power-adjustable switchs color-temperature regulating and controls driving circuit |
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| CN107172766A true CN107172766A (en) | 2017-09-15 |
| CN107172766B CN107172766B (en) | 2019-03-01 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107949095A (en) * | 2017-10-31 | 2018-04-20 | 浙江凯耀照明股份有限公司 | LED light High voltage output control device and control method |
| CN108834261A (en) * | 2018-07-17 | 2018-11-16 | 西南科技大学 | A kind of circuit control system and method mixing light adjustable color |
| CN109379805A (en) * | 2018-10-16 | 2019-02-22 | 欧普照明股份有限公司 | Signal integration circuit and method and signal monitoring circuit and method |
| CN110138380A (en) * | 2019-04-01 | 2019-08-16 | 山东华翼微电子技术股份有限公司 | A kind of power down time observation circuit and method |
| CN114019241A (en) * | 2021-11-11 | 2022-02-08 | 江苏科技大学 | Method and device for determining resistance value of resistor in power device driving circuit |
| CN114554648A (en) * | 2022-02-28 | 2022-05-27 | 深圳利普芯微电子有限公司 | Control circuit, overvoltage protection circuit, control chip and driving power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107949095A (en) * | 2017-10-31 | 2018-04-20 | 浙江凯耀照明股份有限公司 | LED light High voltage output control device and control method |
| CN108834261A (en) * | 2018-07-17 | 2018-11-16 | 西南科技大学 | A kind of circuit control system and method mixing light adjustable color |
| CN109379805A (en) * | 2018-10-16 | 2019-02-22 | 欧普照明股份有限公司 | Signal integration circuit and method and signal monitoring circuit and method |
| CN110138380A (en) * | 2019-04-01 | 2019-08-16 | 山东华翼微电子技术股份有限公司 | A kind of power down time observation circuit and method |
| CN110138380B (en) * | 2019-04-01 | 2023-08-04 | 山东华翼微电子技术股份有限公司 | Power-down time monitoring circuit and method |
| CN114019241A (en) * | 2021-11-11 | 2022-02-08 | 江苏科技大学 | Method and device for determining resistance value of resistor in power device driving circuit |
| CN114554648A (en) * | 2022-02-28 | 2022-05-27 | 深圳利普芯微电子有限公司 | Control circuit, overvoltage protection circuit, control chip and driving power supply |
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| Publication number | Publication date |
|---|---|
| CN107172766B (en) | 2019-03-01 |
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