CN107949105A - Constant current driver circuit for LED and lamps and lanterns - Google Patents
Constant current driver circuit for LED and lamps and lanterns 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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- 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]
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Abstract
The present invention provides a kind of constant current driver circuit for LED and lamps and lanterns, including：Power supply module, detection control module, the lamp group A and lamp group B being connected in series, constant-current control module U1 and constant-current control module U2, controllable switch module K1；Power supply module connects lamp group A and lamp group B to provide supply voltage, and A is close to power supply module for lamp group；One end outconnector connection U1 and then ground connection of the lamp group A away from power supply module, one end outconnectors of the lamp group B away from power supply module connect U2 and then are grounded；Lamp group A parallel connection controllable switch modules K1；The closure of control module control controllable switch module K1 is detected with short circuit lamp group A, to control lamp group A and lamp group B alternately to shine, such as lamp group A, lamp group B can shine at the same time in 220V high pressures, and lamp group A, lamp group B alternately shine in 120V low pressure, flexibility is high.Additionally provide a kind of lamps and lanterns.
Description
Technical field
The present invention relates to LED constant current actuation techniques field, and specifically, the present invention relates to a kind of constant current driver circuit for LED
And lamps and lanterns.
Background technology
In illuminating industry, there are many LED light devices in the fabrication process, may not can determine that the device is final
Using in which country or the area in the whole world, it is impossible to which it is 110Vac or 220Vac to determine power supply grid, it is thus possible at the same time
Meet that the twin voltage linear constant current drive scheme of two kinds of power grid power supplies of 110Vac and 220Vac just seems necessary.
Traditional twin voltage linear constant current drive scheme, is the 2 mutually independent LED light groups of string with the LED light group carried, works
2 cluster of lamps, ornamental group tandem working when basic principle is high pressure, 2 cluster of lamps, ornamental group parallel operations during low pressure.Using this drive scheme, cost compared with
It is low, but flexibility is poor, and some can not be driven there was only the lamps and lanterns of single-string LED lamp group, the LED light group of this lamps and lanterns is in LED
Output line can be drawn with tap between lamp bead.
The content of the invention
The purpose of the present invention is intended at least solve one of above-mentioned technological deficiency, and the particularly poor technology of flexibility lacks
Fall into.
The present invention provides a kind of constant current driver circuit for LED, including：Power supply module, detection control module, the lamp being connected in series
Group A and lamp group B, constant-current control module U1 and constant-current control module U2, controllable switch module K1；
The power supply module connects lamp group A and lamp group B to provide supply voltage, and lamp group A is close to the power supply module；Lamp group
One end outconnector connection constant-current control module U1 and then ground connection of the A away from the power supply module, lamp group B is away from the power supply
One end outconnector connection constant-current control module U2 and then ground connection, constant-current control module U1 of module cause lamp group A to pass through perseverance
Fixed output current, constant-current control module U2 cause lamp group B to pass through constant output current；The lamp group A controllable switches in parallel
Module K1；
The detection control module includes voltage detection unit, signal oscillating unit and logic control element；The voltage
Detection unit detects the supply voltage that the power supply module provides, and the signal oscillating unit is the logic control element
Oscillator signal, logic control element output switch control signal EN1, constant current according to the size of the supply voltage are provided
Control signal EN2, constant-current control signal EN3；Constant-current control signal EN2 controls constant-current control module U1, constant-current control signal EN3
Constant-current control module U1 is controlled, the closure of switch controlling signal EN1 control controllable switch modules K1 is with short circuit lamp group A, with control
Lamp group A and lamp group B alternately shines；
When it is low voltage range that the voltage detection unit, which detects the supply voltage, the logic control element control
EN1, EN2, EN3, so that：U1 is turned on when K1 is disconnected；U1 is disconnected when K1 is turned on and U2 is turned on；So as to lamp group A, lamp group B successively
Alternately shine.
In one of the embodiments, the lamp group A and lamp group B are made of mother's LED lamp group of independent whole string, from described
Tap outconnector connection constant-current control module U1 and then ground connection in mother's LED lamp group.
In one of the embodiments, lamp group A and lamp group B has identical luminous power under same operating condition.
In one of the embodiments, the controllable switch module includes controllable switch device or controllable switch device group
Close.
In one of the embodiments, when it is high voltage range that the voltage detection unit, which detects the supply voltage,
The logic control element controls EN1, EN2, EN3, so that：K1, U1 are disconnected, U2 conductings, so that lamp group A, lamp group B are sent out at the same time
Light.
In one of the embodiments, the logic control element include NOT gate INV1, NOT gate INV2, NAND gate NAND1,
NAND gate NAND2；
The voltage detection unit according to the input terminal of the size voltage sense signal of the supply voltage to INV1,
For the signal oscillating unit outputting oscillation signal to the first input end of NAND1, the output terminal connection NAND1's of INV1 is second defeated
Enter end；
The output terminal of NAND1 connects K1 to export EN1；
The first input end of the output terminal connection NAND2 of NAND1, the second input terminal of the output terminal connection NAND2 of INV1,
The input terminal of the output terminal connection NOT gate INV2 of NAND2, the output terminal of INV2 connect U1 to export EN2；
The output terminal of INV1 connects U2 to export EN3.
In one of the embodiments, the logic control element include NOT gate INV1, NOT gate INV2, NOT gate INV3, with
NOT gate NAND1, NAND gate NAND2, NAND gate NAND3；
The voltage detection unit according to the input terminal of the size voltage sense signal of the supply voltage to INV1,
For the signal oscillating unit outputting oscillation signal to the first input end of NAND1, the output terminal connection NAND1's of INV1 is second defeated
Enter end；
The output terminal of NAND1 connects K1 to export EN1；
The first input end of the output terminal connection NAND2 of NAND1, the second input terminal of the output terminal connection NAND2 of INV1,
The input terminal of the output terminal connection NOT gate INV2 of NAND2, the output terminal of INV2 connect U1 to export EN2；
The signal oscillating unit outputting oscillation signal to NAND3 first input end, INV1 output terminal connection INV3
Input terminal, the second input terminal of the output terminal connection NAND3 of INV1, the output terminal connection U2 of NAND3 is to export EN3.
In one of the embodiments, when it is low voltage range that the voltage detection unit, which detects the supply voltage,
EN1, EN2 are the pwm signal that duty cycle is 50%, and the output current for controlling U1 and U2 is IMAX；When the voltage detection unit
When to detect the supply voltage be high voltage range, the output current for controlling U2 is IMAX × 50%, and the supply voltage is low
Voltage range is consistent with the luminous power of lamp group B with lamp group A during high voltage range.
In one of the embodiments, the controllable switch module K1 includes controllable switch device Q1 and controllable switch device
Q2, controllable switch device Q1 are connected in parallel with lamp group A, and the control terminal of controllable switch device Q1 is connect by controllable switch device Q2
Ground, the control terminal of logic control element connection controllable switch device Q2 is to export EN1.
Invention also provides a kind of lamps and lanterns, it includes the constant current driver circuit for LED according to any of the above-described embodiment.
Above-mentioned constant current driver circuit for LED and lamps and lanterns, including：Power supply module, detection control module, the lamp group A being connected in series
With lamp group B, constant-current control module U1 and constant-current control module U2, controllable switch module K1；Power supply module connection lamp group A and
Lamp group B is to provide supply voltage, and lamp group A is close to the power supply module；Lamp group A draws connection in one end away from the power supply module
Line connection constant-current control module U1 and then ground connection, one end outconnector connection constant current controls of the lamp group B away from the power supply module
Molding block U2 and then ground connection, constant-current control module U1 cause lamp group A to cause by constant output current, constant-current control module U2
Lamp group B passes through constant output current；The lamp group A controllable switch module K1 in parallel；The detection control module includes voltage
Detection unit, signal oscillating unit and logic control element；The voltage detection unit detects the institute that the power supply module provides
Supply voltage is stated, the signal oscillating unit provides oscillator signal, the logic control element root for the logic control element
Output switch control signal EN1, constant-current control signal EN2, constant-current control signal EN3 according to the size of the supply voltage；It is permanent
Flow control signals EN2 controls constant-current control module U1, constant-current control signal EN3 control constant-current control module U1, switch control letter
The closure of number EN1 control controllable switch module K1 is with short circuit lamp group A, to control lamp group A and lamp group B alternately to shine；When the electricity
When the pressure detection unit detection supply voltage is low voltage range, the logic control element controls EN1, EN2, EN3, so that
：U1 is turned on when K1 is disconnected；U1 is disconnected when K1 is turned on and U2 is turned on；So as to which lamp group A, lamp group B alternately shine successively.Detection control
Module can according to the size of supply voltage control LED lamp groups shine, such as can in 220V high pressures lamp group A, lamp group B
Shine at the same time, and lamp group A, lamp group B alternately shine in 120V low pressure, flexibility is high, and even if lamp group A, lamp group B are single
String mother's LED lamp group is drawn output line by centre tap and is formed, and can also drive.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the constant current driver circuit for LED module map of one embodiment；
Fig. 2 is the power supply module schematic diagram of one embodiment；
Fig. 3 is the constant current driver circuit for LED physical circuit figure of one embodiment；
Fig. 4 is the constant current driver circuit for LED physical circuit figure of another embodiment；
Fig. 5 is female lamp group schematic diagram of the independent whole string of one embodiment；
Fig. 6 is the constant current driver circuit for LED module map of another embodiment；
Fig. 7 is the oscillogram of each control signal when one embodiment supply voltage is 120V low-voltages；
Fig. 8 is current direction schematic diagram when one embodiment supply voltage is 120V low-voltages；
Fig. 9 is the oscillogram of each control signal when one embodiment supply voltage is 220V high voltages；
Figure 10 is the oscillogram of each control signal when another embodiment supply voltage is 220V high voltages.
Embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or has the function of same or like element.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that what is used in the specification of the present invention arranges
Diction " comprising " refer to there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
One or more other features, integer, step, operation, element, component and/or their groups.It should be understood that when we claim member
Part is " connected " or during " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " can include wireless connection or wireless coupling.It is used herein to arrange
Taking leave "and/or" includes whole or any cell and all combinations of one or more associated list items.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific terminology), there is the meaning identical with the general understanding of the those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, it should be understood that have with the context of the prior art
The consistent meaning of meaning, and unless by specific definitions as here, idealization or the implication of overly formal otherwise will not be used
To explain.
Fig. 1 is the constant current driver circuit for LED module map of one embodiment, is please referred to Fig.1.
The present invention provides a kind of constant current driver circuit for LED, including power supply module P, detection control module M, is connected in series
Lamp group A and lamp group B, constant-current control module U1 and constant-current control module U2, controllable switch module K1.
Fig. 2 is the power supply module schematic diagram of one embodiment, refers to Fig. 2.In the present embodiment, power supply module P includes
Wire resistor FR1, rectifier bridge DB1, filter capacitor E1, discharge resistance R1.One end connection supply input voltage of wire resistor FR1
L lines, the positive input terminal of the other end connection rectifier bridge DB1 of wire resistor FR1, the N lines connection rectifier bridge DB1's of input voltage
Negative input end.The cathode of the positive output end connection filter capacitor E1 of rectifier bridge DB1, while it is connected in series N string LED lamp groups.It is whole
Flow the negative output terminal connection of bridge DB1 systematically.The anode welding system of filter capacitor E1, a termination filtered electrical of discharge resistance R1
The cathode of appearance E1, another terminating systems of discharge resistance R1.
Power supply module P connection lamp group A and lamp group B is to provide supply voltage, and lamp group A is close to power supply module P.Lamp group A is remote
One end outconnector connection constant-current control module U1 of power supply module P and then ground connection, the one end of lamp group B away from power supply module P
Outconnector connection constant-current control module U2 and then ground connection, constant-current control module U1 cause lamp group A to pass through constant output electricity
Stream, constant-current control module U2 cause lamp group B to pass through constant output current.The lamp group A controllable switch module K1 in parallel.
Detection control module M includes voltage detection unit, signal oscillating unit and logic control element.Voltage detection unit
The supply voltage that power supply module provides is detected, signal oscillating unit provides oscillator signal, logic control list for logic control element
Member output switch control signal EN1, constant-current control signal EN2, constant-current control signal EN3 according to the size of supply voltage.It is permanent
Flow control signals EN2 controls constant-current control module U1, constant-current control signal EN3 control constant-current control module U1, switch control letter
The closure of number EN1 control controllable switch module K1 is with short circuit lamp group A, to control lamp group A and lamp group B alternately to shine.
When voltage detection unit detection supply voltage is low voltage range, logic control element control EN1, EN2, EN3,
So that：U1 is turned on when K1 is disconnected；U1 is disconnected when K1 is turned on and U2 is turned on；So as to which lamp group A, lamp group B alternately shine successively, wherein
EN1, EN2 are pwm signal.Such as detection control module M can control lamp group A, lamp group B synchronizations there was only cluster of lamps, ornamental group hair
Light, lamp group A, lamp group B alternately shine successively in the cycle period of setting.It is when voltage detection unit detects the supply voltage
During high voltage range, logic control element control EN1, EN2, EN3, so that：K1, U1 are disconnected, U2 conductings, so that lamp group A, lamp
Group B shines at the same time.
Fig. 3 is the constant current driver circuit for LED physical circuit figure of one embodiment, and Fig. 4 is the LED constant current of another embodiment
Drive circuit physical circuit figure；
See Fig. 3 and Fig. 4, in the present embodiment, voltage detection unit can include first resistor R3 and second resistance R4, supply
The output terminal of electric module P is grounded through R3 and R4, and the connecting pin voltage sense signal between R3 and R4 is to logic control element.
See Fig. 3, in certain embodiments, logic control element can include NOT gate INV1, NOT gate INV2, NAND gate
NAND1, NAND gate NAND2.
Voltage detection unit is according to the size voltage sense signal of supply voltage to the input terminal of INV1, signal oscillating
Unit outputting oscillation signal to NAND1 first input end, INV1 output terminal connection NAND1 the second input terminal.NAND1's
Output terminal connects K1 to export EN1.The first input end of the output terminal connection NAND2 of NAND1, the output terminal connection of INV1
The second input terminal of NAND2, the input terminal of the output terminal connection NOT gate INV2 of NAND2, the output terminal of INV2 connect U1 to export
EN2.The output terminal of INV1 connects U2 to export EN3.
Understand, when voltage detection unit detection supply voltage is low voltage range, low level can be exported and arrive INV1's
Input terminal, so as to export the PMW letter opposite with oscillating circuit waveform by each gate circuit, EN3 output high level, EN1 and EN2
Number.When voltage detection unit detection supply voltage is high voltage range, high level can be exported to the input terminal of INV1, so that
By each gate circuit, EN1 and EN3 output high level signals, EN2 output low level signals, lamp group A and lamp group B are in the EN3 at this time
High level signal control next shine.
And in further embodiments, see Fig. 4, logic control element include NOT gate INV1, NOT gate INV2, NOT gate INV3,
NAND gate NAND1, NAND gate NAND2, NAND gate NAND3.
Voltage detection unit is according to the size voltage sense signal of supply voltage to the input terminal of INV1, signal oscillating
Unit outputting oscillation signal to NAND1 first input end, INV1 output terminal connection NAND1 the second input terminal.NAND1's
Output terminal connects K1 to export EN1.The first input end of the output terminal connection NAND2 of NAND1, the output terminal connection of INV1
The second input terminal of NAND2, the input terminal of the output terminal connection NOT gate INV2 of NAND2, the output terminal of INV2 connect U1 to export
EN2.Signal oscillating unit outputting oscillation signal to NAND3 first input end, INV1 output terminal connection INV3 input terminal,
The second input terminal of the output terminal connection NAND3 of INV1, the output terminal of NAND3 connect U2 to export EN3.
Understand, when voltage detection unit detection supply voltage is low voltage range, low level can be exported and arrive INV1's
Input terminal, so as to export the PMW letter opposite with oscillating circuit waveform by each gate circuit, EN3 output high level, EN1 and EN2
Number.When voltage detection unit detection supply voltage is high voltage range, high level can be exported to the input terminal of INV1, so that
The PWM letter opposite with oscillator signal is exported by each gate circuit, EN1 output high level signals, EN2 output low level signals, EN3
Number, lamp group A and lamp group B controls next to shine in the pwm signal at this time.
Each constant-current control module can include current constant control chip, to export constant current.Controllable switch module bag
Controllable switch device is included, by controlling the closure of controllable switch device so that the lamp group in parallel with controllable switch module K1
A short circuits.Controllable switch device can be the switchtypes such as field-effect metal-oxide-semiconductor, thyristor, transistor semiconductor devices or
Combination of devices with effects equivalent, is in the present embodiment field-effect metal-oxide-semiconductor.
In the present embodiment, lamp group A, lamp group B are made of mother's LED lamp group of independent whole string, the tap from mother's LED lamp group
Outconnector connects corresponding constant-current control module U1 and then is grounded.Fig. 5 is female lamp group of the independent whole string of one embodiment
Schematic diagram, referring to Fig. 5, mother's lamp group includes lamp group A, lamp group B.In certain embodiments, in order in lamp group A, lamp group B alternating
Possess consistent illumination effect when luminous, lamp group A, lamp group B have identical luminous power, such as lamp under same operating condition
Group A, lamp group B are identical, i.e., with identical quantity, specification, the LED lamp bead of connection mode, the so situation in same voltage and current
There can be identical luminous power down.Lamp group A or lamp group B can include a plurality of LED branches in parallel.In some embodiments
In, make LED is more stable to shine to filter clutter, lamp group A, lamp group B can also be parallel with capacitance, and be in series with two poles
Pipe.
Fig. 6 is the constant current driver circuit for LED module map of another embodiment, refers to Fig. 6.Make LED to filter clutter
More stable shines, and power supply module P is connected by diode D2 connection lamps group A, lamp group A with lamp group B, and lamp group B passes through diode
D3 connections U2.
See Fig. 3,4,6, controllable switch module K1 includes controllable switch device Q1 and controllable switch device Q2, controllable switch device
Part Q1 is connected in parallel with lamp group A, and the control terminal of controllable switch device Q1 is grounded by controllable switch device Q2, detection control mould
The control terminal of block M connection controllable switch devices Q2 is to export EN1.Controllable switch device Q1, Q2 can be N-channel type field-effect
Metal-oxide-semiconductor, the current input terminal of the drain electrode connection lamp group A of Q1, the current output terminal of the source electrode connection lamp group A of Q1, the drain electrode of Q2 connect
Connect the grid of Q1, the source electrode ground connection of Q2, the grid of detection control module M connections Q2 is to export EN1.Between the drain and gate of Q1
It is connected between the source electrode and grid of resistance R2, Q1 and is connected with zener diode ZD1.The source electrode of the cathode connection Q1 of ZD1, ZD1
Anode connection Q1 grid.
For safety, in certain embodiments, draining for Q2 can connect the grid of Q1 by current limiting device, or Q1
Source electrode can connect the current output terminal of lamp group A by current limiting device, and example is connected by diode D1, and the cathode of D1 connects the source of Q1
Pole, the anode of D1 connect the current output terminal of lamp group A.
Constant-current control module U1 and U2 are controllable, can be controlled by EN2 and EN3, such as when EN2 is high level
U1 work output constant current when " 1 ", and U1 is disconnected when being low level " 0 "；When EN3 is high level " 1 ", U2 work output is permanent
Constant current, and U2 is disconnected when being low level " 0 ".
Fig. 7 is the oscillogram of each control signal when one embodiment supply voltage is 120V low-voltages；, refer to Fig. 7.When
The voltage detection unit detect the supply voltage for low voltage range (such as 120V or so, such as 110V~130V) when, logic
Control unit controls EN1, EN2, EN3, so that：U1 is turned on when K1 is disconnected；U1 is disconnected when K1 is turned on and U2 is turned on；So as to lamp group
A, lamp group B alternately shines successively.Wherein EN1, EN2 are pwm signal.In the present embodiment, U1 is turned on when K1 is disconnected, when K1 is turned on
U1 is disconnected, and U2 can be always maintained at turning on.Therefore, EN1 and EN2 can be identical pwm signal, and EN3 can be high electricity
Ordinary mail number.
Specifically, when EN1 is high level signal " 1 ", field-effect metal-oxide-semiconductor Q2 is in the conduction state.Because of field-effect metal-oxide-semiconductor Q2
Source electrode welding system, the drain electrode of field-effect metal-oxide-semiconductor Q2 at this time is low potential, the drain electrode of field-effect metal-oxide-semiconductor Q2 meets field-effect MOS
The grid of pipe Q1, at this time field-effect metal-oxide-semiconductor Q1 be off state.Meanwhile EN2 is high level signal " 1 ", lamp group A is in and leads
Logical state.Because of low pressure input state, lamp group A voltages have been turned on, no matter EN3 outputs level signals " 0 " or " 1 ", lamp group B locates
In off state.The output current of lamp group A is controlled by constant-current control module U1.Assuming that the output electricity of constant-current control module U1 settings
Flow for IA, the voltage of lamp group A is UA, and the output power of lamp group A is PLEDA=UA*IA。
When EN1 is low level signal " 0 ", field-effect metal-oxide-semiconductor Q2 is closed.Field-effect metal-oxide-semiconductor Q1 is in electricity at this time
Under the collective effect for hindering R2 and zener diode ZD1, the grid voltage of field-effect metal-oxide-semiconductor Q1 is higher than source voltage, and Q1 is in and leads
Logical state, lamp group A short circuits, lamp group A is off state.EN2 is " 0 ", and EN3 is " 1 ", and the output current of lamp group B is by constant current
Control module U2 is controlled, and lamp group B is in the conduction state.Assuming that the output current that constant-current control module U2 is set is IB, lamp group A's
Voltage is UB, and the output power of lamp group B is PLEDE=UB*IB。
As can be seen from the above description, it can control lamp group A when detecting EN1, EN2, EN3 of output of control module M change
With the light on and off of lamp group B.When EN1 and EN2 exports pwm control signal and EN3 exports the digital signal of high level, lamp group A and lamp
Group B is in conducting state in turn, and, so as to alternately shine, the frequency of wherein pwm control signal is unrestricted.
Fig. 8 is current direction schematic diagram when one embodiment supply voltage is 120V low-voltages, referring to Fig. 8, electric current A is
Current trend when only lamp group A is turned on, electric current B are current trend when only lamp group B is turned on.
EN1 and EN2 is pwm control signal, and wherein the duty cycle of pwm control signal is 50%, the work of lamp group A and lamp group B
Make the waveform for the duty cycle form that electric current is 50%.The output power of lamp group A is P at this timeLEDA=UA*IA* 50%, lamp group B's is defeated
It is P to go out powerLEDB=UB*IB1* 50%, when lamp group A and lamp group B is equal by the current value that constant-current control module U1 and U2 are set
For IMAX, the gross output of lamp group A and lamp group B are：
PLED=PLEDA+PLEDB=ULED*IMAX* 50% (formula 1)
When it is high voltage range (such as 210V~230V) that detection control module M, which detects the supply voltage, control
EN1, EN2, EN3, so that：K1, U1 are disconnected, U2 conductings, so that lamp group A, lamp group B shine at the same time.Fig. 9 supplies for one embodiment
The oscillogram of each control signal when piezoelectric voltage is 220V high voltages, with reference to Fig. 3, high level of the lamp group A and lamp group B in EN3 at this time
The next straight hair light of signal.Figure 10 is the oscillogram of each control signal when another embodiment supply voltage is 220V high voltages, knot
Fig. 4 is closed, lamp group A and lamp group B is in the next straight hair light (in human eye) of pwm signal of EN3, PWM duty cycle 50% at this time.
Specifically, when EN1 is " 1 ", EN2 is " 0 ", and when EN3 is " 1 ", lamp group A and lamp group B are in the conduction state.Work as EN1
It is in the conduction state for " 1 ", the field-effect metal-oxide-semiconductor Q2 of constant current output unit.Because of the source electrode welding system of field-effect metal-oxide-semiconductor Q2,
The drain electrode of field-effect metal-oxide-semiconductor Q2 at this time is low potential, and the drain electrode of field-effect metal-oxide-semiconductor Q2 connects the grid of field-effect metal-oxide-semiconductor Q1, at this time
Field-effect metal-oxide-semiconductor Q1 is off state.When EN2 is " 0 ", constant-current control module U1 is off state, permanent when EN3 is " 1 "
Flow control module U2 is in the conduction state.Assuming that the output current that constant-current control module U2 is set is IMAX, lamp group A and lamp group B
General power be：
PLED=ULED*IMAX(formula 2)
When the setting electric current value of control module U2 is IMAX* m%, the general power of system led lamp string are
PLED=ULED*IMAX* m% (formula 3)
Description more than, by setting m%=50% (see formula 1 and formula 3), in low voltage range
In (such as 120V or so) or high voltage range (such as 220V or so), the gross output of system led lamp string is equal, equivalent can understand
Of substantially equal for the input power of system, the luminosity of lamps and lanterns is of substantially equal.Supply voltage is low voltage range and high voltage
Lamp group A is consistent with the luminous power of lamp group B during scope.
The setting electric current value that U2 can be set can be IMAX × 50%, at this time high level of the lamp group A and lamp group B in EN3
The next straight hair light of signal, at this time logic control element see Fig. 3, signal waveforms are shown in Fig. 9.The setting electric current value of U2 can also be set
Can be IMAX, in the next straight hair light (in human eye) of pwm signal of EN3, PWM duty cycle is lamp group A and lamp group B at this time
50%, at this time logic control element see Fig. 4, signal waveforms are shown in Figure 10.
The present invention also provides a kind of LED lamp, its LED constant current for including being somebody's turn to do according to any of the above-described embodiment drives electricity
Road.In a practical situation, it is part or all of in power supply module, detection control module, constant-current control module, controllable switch module
Module can be integrated in same integrated circuit, and LED light group is controlled by the integrated circuit.For example, detection control module
All gather with constant-current control module in an integrated circuit, and controllable switch module is integrated in another integrated circuit.Even
In signal concussion unit, logic control element and constant-current control module are all gathered in an integrated circuit.
Above-mentioned constant current driver circuit for LED and lamps and lanterns, including：Power supply module, detection control module, the lamp group A being connected in series
With lamp group B, constant-current control module U1 and constant-current control module U2, controllable switch module K1；Power supply module connection lamp group A and
Lamp group B is to provide supply voltage, and lamp group A is close to the power supply module；Lamp group A draws connection in one end away from the power supply module
Line connection constant-current control module U1 and then ground connection, one end outconnector connection constant current controls of the lamp group B away from the power supply module
Molding block U2 and then ground connection, constant-current control module U1 cause lamp group A to cause by constant output current, constant-current control module U2
Lamp group B passes through constant output current；The lamp group A controllable switch module K1 in parallel；The detection control module includes voltage
Detection unit, signal oscillating unit and logic control element；The voltage detection unit detects the institute that the power supply module provides
Supply voltage is stated, the signal oscillating unit provides oscillator signal, the logic control element root for the logic control element
Output switch control signal EN1, constant-current control signal EN2, constant-current control signal EN3 according to the size of the supply voltage；It is permanent
Flow control signals EN2 controls constant-current control module U1, constant-current control signal EN3 control constant-current control module U1, switch control letter
The closure of number EN1 control controllable switch module K1 is with short circuit lamp group A, to control lamp group A and lamp group B alternately to shine；When the electricity
When the pressure detection unit detection supply voltage is low voltage range, the logic control element controls EN1, EN2, EN3, so that
：U1 is turned on when K1 is disconnected；U1 is disconnected when K1 is turned on and U2 is turned on；So as to which lamp group A, lamp group B alternately shine successively.Detection control
Module can according to the size of supply voltage control LED lamp groups shine, such as can in 220V high pressures lamp group A, lamp group B
Shine at the same time, and lamp group A, lamp group B alternately shine in 120V low pressure, flexibility is high, and even if lamp group A, lamp group B are single
String mother's LED lamp group is drawn output line by centre tap and is formed, and can also drive.
The above is only some embodiments of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
- A kind of 1. constant current driver circuit for LED, it is characterised in that including：Power supply module, detection control module, the lamp being connected in series Group A and lamp group B, constant-current control module U1 and constant-current control module U2, controllable switch module K1；The power supply module connects lamp group A and lamp group B to provide supply voltage, and lamp group A is close to the power supply module；Lamp group A is remote From one end outconnector connection constant-current control module U1 of the power supply module and then ground connection, lamp group B is away from the power supply mould One end outconnector connection constant-current control module U2 of block and then ground connection, it is constant that constant-current control module U1 make it that lamp group A passes through Output current, constant-current control module U2 causes lamp group B to pass through constant output current；The lamp group A controllable switch moulds in parallel Block K1；The detection control module includes voltage detection unit, signal oscillating unit and logic control element；The voltage detecting Unit detects the supply voltage that the power supply module provides, and the signal oscillating unit provides for the logic control element Oscillator signal, the logic control element output switch control signal EN1, current constant control according to the size of the supply voltage Signal EN2, constant-current control signal EN3；Constant-current control signal EN2 controls constant-current control module U1, constant-current control signal EN3 controls The closure of constant-current control module U1, switch controlling signal EN1 control controllable switch module K1 are with short circuit lamp group A, to control lamp group A Alternately shine with lamp group B；When it is low voltage range that the voltage detection unit, which detects the supply voltage, the logic control element control EN1, EN2, EN3, so that：U1 is turned on when K1 is disconnected；U1 is disconnected when K1 is turned on and U2 is turned on；So as to which lamp group A, lamp group B replace successively Shine.
- 2. constant current driver circuit for LED according to claim 1, it is characterised in that the lamp group A and lamp group B are by individually whole Mother's LED lamp group composition of string, tap outconnector connection constant-current control module U1 and then ground connection from mother's LED lamp group.
- 3. constant current driver circuit for LED according to claim 1, it is characterised in that lamp group A and lamp group B is in same work bar There is identical luminous power under part.
- 4. constant current driver circuit for LED according to claim 1, it is characterised in that the controllable switch module includes controllable Switching device or controllable switch combination of devices.
- 5. constant current driver circuit for LED according to claim 1, it is characterised in that when the voltage detection unit detects institute When to state supply voltage be high voltage range, the logic control element controls EN1, EN2, EN3, so that：K1, U1 are disconnected, U2 Conducting, so that lamp group A, lamp group B shine at the same time.
- 6. constant current driver circuit for LED according to claim 1 or 5, it is characterised in that the logic control element includes non- Door INV1, NOT gate INV2, NAND gate NAND1, NAND gate NAND2；The voltage detection unit is described according to the input terminal of the size voltage sense signal of the supply voltage to INV1 To the first input end of NAND1, the second of the output terminal connection NAND1 of INV1 inputs signal oscillating unit outputting oscillation signal End；The output terminal of NAND1 connects K1 to export EN1；The first input end of the output terminal connection NAND2 of NAND1, the second input terminal of the output terminal connection NAND2 of INV1, The input terminal of the output terminal connection NOT gate INV2 of NAND2, the output terminal of INV2 connect U1 to export EN2；The output terminal of INV1 connects U2 to export EN3.
- 7. constant current driver circuit for LED according to claim 1 or 5, it is characterised in that the logic control element includes non- Door INV1, NOT gate INV2, NOT gate INV3, NAND gate NAND1, NAND gate NAND2, NAND gate NAND3；The voltage detection unit is described according to the input terminal of the size voltage sense signal of the supply voltage to INV1 To the first input end of NAND1, the second of the output terminal connection NAND1 of INV1 inputs signal oscillating unit outputting oscillation signal End；The output terminal of NAND1 connects K1 to export EN1；The first input end of the output terminal connection NAND2 of NAND1, the second input terminal of the output terminal connection NAND2 of INV1, The input terminal of the output terminal connection NOT gate INV2 of NAND2, the output terminal of INV2 connect U1 to export EN2；For the signal oscillating unit outputting oscillation signal to the first input end of NAND3, the output terminal connection INV3's of INV1 is defeated Enter end, the second input terminal of the output terminal connection NAND3 of INV1, the output terminal of NAND3 connects U2 to export EN3.
- 8. constant current driver circuit for LED according to claim 1 or 5, it is characterised in that when the voltage detection unit detects When the supply voltage is low voltage range, EN1, EN2 are the pwm signal that duty cycle is 50%, control the output electricity of U1 and U2 Flow for IMAX；When it is high voltage range that the voltage detection unit, which detects the supply voltage, the output current for controlling U2 is IMAX × 50%, the supply voltage are consistent with the luminous power of lamp group B with lamp group A during high voltage range for low voltage range.
- 9. constant current driver circuit for LED according to claim 1, it is characterised in that the controllable switch module K1 includes can Control switching device Q1 and controllable switch device Q2, controllable switch device Q1 are connected in parallel with lamp group A, the control of controllable switch device Q1 End processed is grounded by controllable switch device Q2, and the control terminal of logic control element connection controllable switch device Q2 is to export EN1。
- 10. a kind of lamps and lanterns, it is characterised in that it is included according to claim 1~9 any one of them constant current driver circuit for LED.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711165960.3A CN107949105A (en) | 2017-11-21 | 2017-11-21 | Constant current driver circuit for LED and lamps and lanterns |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711165960.3A CN107949105A (en) | 2017-11-21 | 2017-11-21 | Constant current driver circuit for LED and lamps and lanterns |
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| CN107949105A true CN107949105A (en) | 2018-04-20 |
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| CN201711165960.3A Pending CN107949105A (en) | 2017-11-21 | 2017-11-21 | Constant current driver circuit for LED and lamps and lanterns |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109348601A (en) * | 2018-12-20 | 2019-02-15 | 青岛亿联客信息技术有限公司 | A kind of glory lamp drive circuit and its driving method |
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