CN106455205A - Dual-channel LED driver and open-circuit protection method thereof - Google Patents
Dual-channel LED driver and open-circuit protection method thereof Download PDFInfo
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- CN106455205A CN106455205A CN201610860946.4A CN201610860946A CN106455205A CN 106455205 A CN106455205 A CN 106455205A CN 201610860946 A CN201610860946 A CN 201610860946A CN 106455205 A CN106455205 A CN 106455205A
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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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- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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
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Abstract
The application discloses a dual-channel LED driver and an open-circuit protection method thereof. The dual-channel LED driver is used for driving a first channel LED and a second channel LED and comprises a power converter, a power control circuit, a latch circuit, a first dimming switch and a second dimming switch. When the first channel LED or the second channel LED is open-circuited, the open-circuit state of the open-circuit channel LED is locked, and the long-pass of the non-open-circuit channel LED is kept. The dual-channel LED driver and the open-circuit protection method thereof ensure that when one channel LED is open-circuit, illumination service can be continuously provided and the system safety is ensured.
Description
Technical field
A kind of a kind of the present invention relates to electronic circuit, it is more particularly related to two-channel LED (light emitting diode)
Driver and its open-circuit-protection method.
Background technology
With the continuous development of science and technology, LED just gradually replaces fluorescence due to its small volume, the simple and energy-conserving and environment-protective of driving
Application of the lamp in LCD backlight and general lighting.LED needs drive circuit for the controlled current signal of its offer.?
Some application scenarios, in addition to controlled LED current, in addition it is also necessary to the supply voltage of some such as 12V, 5V, 3.3V etc, uses
To power for other modules (such as microcontroller, wireless control module RF, router etc.).
Existing two-channel LED drive circuit generally adopts two power stages：First power stage includes such as inverse-excitation converting
Device is providing two constant voltages, and one of voltage is used for driving LED, and another voltage is used for other module for power supply；The
Two power stages include two constant-current decompression changers, to control the electric current of the LED for flowing through two passages respectively.If one of them leads to
Road LED opens a way (open circuit) situation, then existing two-channel LED drive circuit cuts out corresponding power stage, to prevent power from continuing
Continue and be supplied to the channel LED.
Core origin system company limited of the U.S. (Monolithic Power Systems, MPS) provide the different dual pathways
LED solution.MPS is only using a power stage, you can realize the driving to two-channel LED and the power supply to wireless module.
Wireless module provides two dim signals, and one of dim signal controls the total brightness of two-channel LED, another dim signal
The light modulation ratio of two channel LEDs of control.When one of passage of the two-channel LED occurs open circuit situation, how to detect
The open circuit situation, ensure the safety (will not overvoltage) of system and continue to provide illumination to be a challenge.
Content of the invention
Therefore it is an object of the invention to solving the above-mentioned technical problem of prior art, a kind of improved dual pathways is proposed
LED driver and its control method.
A kind of embodiments in accordance with the present invention, it is proposed that two-channel LED driver, drive first passage LED and second to lead to
Road LED, the two-channel LED driver includes：Power inverter, is that first and second channel LED provides driving voltage
And driving current, the wherein switch converters include：First winding and the master power switch of the first winding is coupled to, described
One winding when master power switch is turned on storage energy, when master power switch disconnects, energy is provided to the first and second passages
LED；Power control circuit, receives the first dim signal of wireless control module offer and characterizes the electric current for flowing through master power switch
Current sampling signal, produce drive control signal in order to control master power switch；Comparison circuit, compares and characterizes driving voltage
Boost voltage and the size of open circuit threshold value, judge whether first passage LED or second channel LED open a way, and produce open circuit detection letter
Number；Latch cicuit, receives the second dim signal and the open circuit detection signal of wireless control module offer, when open circuit detection signal refers to
When showing first passage LED or second channel LED open circuit, the inversion signal of the second dim signal is latched by the latch cicuit, is produced
The anti-phase latch signal of life；First dimmer switch, is coupled to first passage LED, and first passage LED is dimmed；Second light modulation
Switch, is coupled to second channel LED, second channel LED is dimmed, and second dimmer switch is mutual with the first dimmer switch
Mend conducting；Wherein when first passage LED or second channel LED open circuit, the first dimmer switch and the second dimmer switch are by anti-phase
Latch signal control conducting and disconnection；When first passage LED and second channel LED all do not open a way, the first dimmer switch and
Second dimmer switch is by the second dim signal control conducting and disconnection.
Embodiments in accordance with the present invention, it is also proposed that a kind of open-circuit-protection method of two-channel LED driver, the bilateral
Road LED driver is in order to drive first passage LED and second channel LED, and methods described includes：Receives input voltage, produces drive
Streaming current, in order to drive the first and second channel LEDs；First dim signal of receiving user's input and Regulate signal；To adjust
Signal is synchronized with input voltage, obtains the second dim signal；First and second channel LEDs are adjusted according to the first dim signal
Total current；The open circuit situation of monitoring first passage LED and second channel LED, when there is a channel LED open circuit situation occur,
The open-circuit condition of corresponding open channel is kept, is remain on another passage；When the first and second channel LEDs all do not occur out
Road situation, adjusts the light modulation ratio of first passage LED and second channel LED according to the second dim signal.
Above-mentioned two-channel LED driver and its control method according to each side of the present invention, it is only necessary to which a power stage is
The driving to two-channel LED, the power supply to wireless module when open circuit situation occurs in a channel LED wherein is can achieve, is protected
Card output is not over-pressed and can continue to provide Lighting Service；When two channel LEDs are in open-circuit condition, power stage is closed
Close, so as to reduce power consumption, safeguards system safety.
Description of the drawings
Fig. 1 is the electrical block diagram of the two-channel LED driver 100 according to the embodiment of the present invention；
Fig. 2 is the electrical block diagram of the two-channel LED driver 200 according to the embodiment of the present invention；
Fig. 3 is the circuit theory schematic diagram of the output current counting circuit 61 according to the embodiment of the present invention；
Fig. 4 is the electrical block diagram of the two-channel LED driver 400 according to the embodiment of the present invention；
Fig. 5 is the electrical block diagram of the two-channel LED driver 500 according to the embodiment of the present invention；
Fig. 6 schematically illustrates the circuit of the selection circuit 110 of two-channel LED driver according to embodiments of the present invention
Structural representation；
Fig. 7 is that the circuit structure of the selection circuit 110 of the two-channel LED driver 700 according to the embodiment of the present invention is illustrated
Figure；
Fig. 8 schematically illustrates the logic control of two-channel LED driver 800 according to embodiments of the present invention and driving
The electrical block diagram of circuit 64；
Fig. 9 is the electrical block diagram of the two-channel LED driver 900 according to the embodiment of the present invention；
Figure 10 schematically illustrates the over-pressed decision circuit of two-channel LED driver 1000 according to embodiments of the present invention
120 electrical block diagram；
Figure 11 diagrammatically illustrates the open-circuit-protection method flow diagram of two-channel LED driver according to embodiments of the present invention
1100.
Specific embodiment
The specific embodiment of the present invention is described more fully below, it should be noted that the embodiments described herein is served only for citing
Illustrate, be not limited to the present invention.In the following description, in order to provide thorough understanding of the present invention, a large amount of spies are elaborated
Determine details.It will be apparent, however, to one skilled in the art that：These specific detail need not be adopted to carry out this
Bright.In other instances, in order to avoid obscuring the present invention, known circuit, material or method are not specifically described.
Throughout the specification, meaning is referred to " one embodiment ", " embodiment ", " example " or " example "
?：Special characteristic, structure or the characteristic for describing in conjunction with the embodiment or example is comprised at least one embodiment of the present invention.
Therefore, phrase " in one embodiment " in each place appearance of entire disclosure, " in an embodiment ", " example "
Or " example " is not necessarily all referring to same embodiment or example.Furthermore, it is possible to will be specific with any appropriate combination and/or sub-portfolio
Feature, structure or property combination be in one or more embodiments or example.Additionally, those of ordinary skill in the art should manage
Solution, provided herein accompanying drawing be provided to descriptive purpose, and accompanying drawing is not necessarily drawn to scale.It should be appreciated that working as
When claiming element " being couple to " or " being connected to " another element, it can directly be coupled or be couple to another element or can deposit
In intermediary element.Conversely, when element " being directly coupled to " or " being directly connected to " another element is claimed, there is no intermediary element.
Identical reference indicates identical element.Term "and/or" used herein includes the item that one or more correlations are listed
Any and all combination of purpose.
Fig. 1 is the electrical block diagram of the two-channel LED driver 100 according to the embodiment of the present invention.The so-called dual pathways
LED, that is, have load end of the two paths of LED string/LED coupled in parallel in driver.In the embodiment shown in fig. 1, the two-channel LED
Driver 100 drives first passage LED 1001 and second channel LED 1002, including：Input port 101, receives exchange input
Voltage (as civil power) Vin；Rectifier bridge 102, receives AC-input voltage Vin, rectified signal V is providedDC；First passage LED 1001,
Second channel LED 1002；Power inverter, be first and second channel LED (1001 and 1002) provide driving voltage and
Driving current, the wherein switch converters include：First winding 31 and the master power switch 32 of the first winding 31 is coupled to, institute
State the first winding 31 when master power switch 32 is turned on storage energy, when master power switch 32 disconnects, energy is provided to first
With second channel LED；31 magnetic coupling of the first winding in second winding 104, with power inverter, provides supply voltage VPSTo no
Line traffic control module (RF/MCU) 105；Power control circuit 106, the first dim signal DIM1 of reception and sign flow through main power to be opened
Close the current sampling signal I of 32 electric currentsSEN, drive control signal Dr is produced in order to control master power switch 32, the wherein first light modulation
Signal DIM1 is provided by wireless control module 105；Comparison circuit 108, receives the boost voltage V for characterizing driving voltageAUXAnd open circuit
Threshold value VOVP, the comparison circuit 108 compares boost voltage VAUXWith open circuit threshold value VOVPSize, judge first passage LED
Whether 1001 or second channel LED 1002 open a way, and produces open circuit detection signal OC；Latch cicuit 109, receives wireless controlled molding
The second dim signal DIM2 and open circuit detection signal OC that block 105 is provided, when open circuit detection signal OC indicates first passage LED
During 1001 or second channel LED 1002 open circuit, the inversion signal of the second dim signal DIM2 is latched by the latch cicuit 109,
Produce anti-phase latch signal DIML；First dimmer switch 111, is coupled to first passage LED 1001, to first passage LED
1001 are dimmed；Second dimmer switch 112, is coupled to second channel LED 1002, and second channel LED 1002 is adjusted
Light；Wherein when first passage LED 1001 or second channel LED 1002 opens a way, the first dimmer switch 111 and the second light modulation are opened
112 are closed by anti-phase latch signal DIML control conducting and disconnection；When first passage LED1001 and second channel LED 1002 all do not have
When having open circuit, the first dimmer switch 111 and the second dimmer switch 112 are by the second dim signal DIM2 control conducting and disconnection；The
Two dimmer switchs 112 and the complementary conducting of the first dimmer switch 111.
In one embodiment, latch cicuit 109 includes d type flip flop.The d type flip flop includes：D input, receives the
Two dim signal DIM2；Input end of clock clk, receives open circuit detection signal OC；First outfan Q and the second outfan/Q, its
In anti-phase latch signal DIML provide at the second outfan/Q.
In one embodiment, the first dim signal DIM1 and the second dim signal DIM2 are PWM (pulse width tune
Section) signal.
In the embodiment shown in fig. 1, two-channel LED driver 100 passes through 110 couples of the second dim signal DIM2 of selection circuit
And its anti-phase latch signal DIML is selected, when open circuit detection signal OC indicates first passage LED 1001 or second channel
LED 1002 opens a way, when system needs open-circuit-protection (open current protection, OCP), the selection circuit 110
Select anti-phase latch signal DIML as ratio dim signal DIM0, control the first dimmer switch 111 and the second dimmer switch
112；When open circuit detection signal OC indicates that first passage LED 1001 and second channel LED 1002 all do not open a way, system is not required to
When wanting open-circuit-protection (non-open current protection, NOCP), the selection circuit 110 selects the second light modulation letter
Number DIM2 controls the first dimmer switch 111 and the second dimmer switch 112 as ratio dim signal DIM0.
In the embodiment shown in fig. 1, the two-channel LED driver 100 also includes assists winding 107, with the first winding
Flyback magnetic coupling, produces the boost voltage V for characterizing driving voltageAUX.But it will be appreciated by the person skilled in the art that auxiliary electricity
Pressure VAUXCan also other modes acquisition.
In the embodiment shown in fig. 1, the power control circuit 106 includes：Output current computer 61, receives and characterizes stream
Cross the current sampling signal I of 32 electric current of master power switchSEN, the total current for flowing through the first and second channel LEDs is calculated, produce etc.
Effect output current IEQ；Reference signal generation circuit 62, receives the first dim signal DIM1, produces and receives the first dim signal DIM1
Reference signal V of regulationREF；Error amplifier (EA) 63, receives reference signal VREFWith equivalent output current IEQ, the error puts
Big device 63 is by reference signal VREFWith equivalent output current IEQError amplify and be integrated, produce thermal compensation signal CMP；Logic
Control and drive circuit 64, receive thermal compensation signal CMP, produce drive control signal Dr in order to control master power switch 32.One
In individual embodiment, the reference signal generation circuit 62 receives source reference voltage VR0With the first dim signal DIM1, and by first
The dutycycle of dim signal DIM1 and source reference voltage VR0It is multiplied, produces reference signal VREF, i.e. reference signal VREFAdjust with first
The dutycycle of optical signal DIM1 and source reference voltage VRRelation be：
VREF=VR0×DDIM1
Wherein DDIM1Represent the dutycycle of the first dim signal DIM1.
In the embodiment shown in fig. 1, the power inverter also includes：Vice-side winding 33, with 31 magnetic coupling of the first winding；
First from power switch 34, is coupled between vice-side winding 33 and first passage LED 1001；Second from power switch 35, couples
Between vice-side winding 33 and second channel LED 1002.The two-channel LED driver 100 also includes：Phase inverter 113, connects
Receipts ratio dim signal DIM0, produces the inversion signal of ratio dim signal DIM0.
In one embodiment, when power inverter is using isolated (anti exciting converter in as Fig. 1), ratio is dimmed
Signal DIM0 is via again for controlling the first dimmer switch 111 and the second dimmer switch 112 after photoelectrical coupler 114.Now by
In the effect of photoelectrical coupler 114, ratio dim signal DIM0 is inverted.When power inverter adopts non-isolation type converter
When, the second dim signal is without the need for via photoelectrical coupler, being specifically shown in FIG. 5 below illustrated embodiment.
In one embodiment, the second winding 104 by diode and voltage regulator circuit (embodiment as shown in Figure 1
Low pressure difference linear voltage regulator LDO) power to wireless control module 105.But it should be appreciated by those skilled in the art that voltage-regulation
Circuit is not limited to LDO, it would however also be possible to employ other suitable circuits, it might even be possible to be omitted.
Fig. 2 is the electrical block diagram of the two-channel LED driver 200 according to the embodiment of the present invention.Bilateral shown in Fig. 2
Road LED driver 200 is similar to two-channel LED driver shown in Fig. 1 100, different from two-channel LED driver shown in Fig. 1 100
, Fig. 2 particularly illustrates the coupling mode of the second winding 104 and power switch 32, and output current computer 106 and work(
The coupling mode of rate switch 32.Two-channel LED driver shown in Fig. 2 200 also includes：First sampling resistor 115 and second is adopted
Sample resistor 116, is coupled in series between master power switch 32 and primary side reference ground, wherein the first sampling resistor 115 and
The voltage at two sampling resistors, 116 two ends is the current sampling signal ISEN.Second winding 104 is via the second sampling resistor
116 are coupled to primary side reference ground.First sampling resistor 115 and the voltage (I at 116 two ends of the second sampling resistorSEN) via defeated
After going out current calculator 106, equivalent output current I of the first and second channel LED total currents of reflection is converted intoEQ.
In the running of system, when master power switch 32 disconnects, the electric current for flowing through thereon is zero；When main power is opened
When 32 conducting is closed, electric current I thereon is flow through32Can be expressed as
Wherein ILmRepresent the electric current of the magnetizing inductance for flowing through the first winding 31, I104Represent the electricity for flowing through the second winding 104
Stream, N2/N1 represents the turn ratio of the second winding 104 and the first winding 31.
Then voltage (the i.e. current sampling signal I at the first sampling resistor 115 and 116 two ends of the second sampling resistorSEN)
For：
ISEN=I32×(R115+R116)-I104×R116(2)
Wherein R115Represent the resistance value of the first sampling resistor 115, R116Represent the resistance of the second sampling resistor 116
Value.
By equation (1) and equation (2), can obtain
By the turn ratio of the second winding 104 and the first winding 31, the first sampling resistor 115 and the second sampling resistor
116 resistance value does following setting：
Can then obtain
ISEN=ILm×(R115+R116) (4)
Can see from equation (4), when by the turn ratio of the second winding 104 and the first winding 31, the first sampling resistor
115 and second sampling resistor 116 resistance value relation do specific settings after, current sampling signal ISENOnly with flow through first around
The electric current correlation of 31 magnetizing inductances is organized, and is not affected by the electric current for flowing through the second winding 104.Current sampling signal ISENWarp
Cross output current computer 106 and be converted into equivalent output current IEQAfterwards, first passage LED 1001 and can be accurately reflected
The total current of two passages 1002.
Other circuit structures of two-channel LED driver shown in Fig. 2 200 and operation logic are driven with two-channel LED shown in Fig. 1
Dynamic device 100 is similar, is that narration is simple and clear, and I will not elaborate.
Fig. 3 is the circuit theory schematic diagram of the output current counting circuit 61 according to the embodiment of the present invention.Real shown in Fig. 3
Apply in example, the output current counting circuit 61 includes：The switching tube 661～663 of control signal Dr control driven and electric capacity
Device 664.When master power switch 32 is turned on, switching tube 661 and 663 is turned on, and switching tube 662 disconnects, now current sampling signal
ISENIt is transferred to capacitor 664, equivalent output current IEQEqual to zero.When master power switch 32 disconnects, switching tube 661 and 663
Disconnect, switching tube 663 is turned on, now equivalent output current IEQEqual to the voltage at 664 two ends of capacitor, the voltage is adopted equal to electric current
Sample signal ISENPeak value.
Characterize equivalent output current I of the first and second channel LED total currentsEQIt is transported to error amplifier 63.Pass through
The effect of error amplifier 63, equivalent output current IEQMeansigma methodss be adjusted to reference signal VREF, and reference signal VREFReceive
The first dim signal DIM1 control that user provides.Therefore, in aforementioned two-channel LED driver 100,200, the first light modulation letter
Number DIM1 have adjusted the total brightness of total current, the i.e. two-channel LED of the first and second channel LEDs.
As the first dimmer switch 111 and the second dimmer switch 112 are controlled by ratio dim signal DIM0 and the first light modulation
Switch 111 and the complementary conducting of the second dimmer switch 112, i.e. first passage LED 1001 and second channel LED 1002 is by complementary point
Bright offer illumination.Therefore, ratio dim signal DIM0 have adjusted the light modulation ratio of each channel LED.For example, when ratio light modulation letter
When the dutycycle of number DIM2 is 40%, via due to being inverted after photoelectrical coupler 114, then the light modulation of first passage LED 1001
Ratio is 40% for the light modulation ratio of 60%, second channel LED 1002.I.e. in a cycle of ratio dim signal DIM2,
The lighting time of first passage LED 1001 accounts for 60%, and the lighting time of second channel LED 1002 accounts for 40%.
In system operation, if open circuit situation occurs in a certain channel LED (as first passage LED 1001), when this is logical
During the corresponding dimmer switch in road switched on (as the second dim signal DIM2 causes the first dimmer switch 111 to be switched on), then due to
The open circuit situation of first passage LED 1001, characterizes the boost voltage V of driving voltageAUXWhen master power switch 32 disconnects by height
In open circuit threshold value VoVP.Accordingly, latch cicuit 109 will be triggered, and produce the second dim signal in its second outfan/Ω
The anti-phase latch signal DIML of DIM2, the anti-phase latch signal DIML pins the second dim signal DIM2 rp state now
(pinning the state for the first dimmer switch 111 being disconnected, the second dimmer switch 112 being turned on)；Meanwhile, in selection circuit 110
Place, the anti-phase latch signal DIML of the second dim signal DIM2 is selected as ratio dim signal DIM0, for controlling the first tune
Photoswitch 111 and the second dimmer switch 112 so that the second dimmer switch 112 is kept constant conduction, the first dimmer switch 111
It is kept and is continuously turned off.I.e. when open circuit situation occurs, respective channel LED is off (open-circuit condition is lockable), another passage
LED is kept persistently to light and illuminates to provide and ensure that output is not over-pressed.
Therefore, aforementioned two-channel LED driver 100,200 is when open circuit occurs in a certain channel LED, it is ensured that system is permissible
Continue to provide application scenario and illuminate and ensured system safety.
Fig. 4 is the electrical block diagram of the two-channel LED driver 400 according to the embodiment of the present invention.Bilateral shown in Fig. 4
Road LED driver 400 is similar to two-channel LED driver shown in Fig. 1 100, different from two-channel LED driver shown in Fig. 1 100
, in two-channel LED driver shown in Fig. 4 400, second dim signal of wireless control module (RF/MCU) 105
DIM2 and AC-input voltage VinAnd/or commutating voltage VDCSynchronous.Specifically, the wireless control module 105 includes：With
Family input module 51, provides the first dim signal DIM1 and Regulate signal DIM of user input；Zero-crossing comparator 52, receives table
Levy AC-input voltage Vin(and/or rectified signal VDC) input sample signal and null value reference signal VZ(as 0.1V), described
Null value comparator 52 compares input sample signal and null value reference signal VZSize, produce zero passage detection signal ZD；Synchronous tactile
Device 53 is sent out, Regulate signal DIM and zero passage detection signal ZD that receive user is provided, produce the second dim signal DIM2.Wherein institute
Zero passage detection signal ZD is reset, response regulation signal DIM is set, the priority of reset to state the second dim signal DIM2 response
Priority higher than set.
Other circuit structures of two-channel LED driver shown in Fig. 4 400 and operation logic are driven with two-channel LED shown in Fig. 1
Dynamic device 100 is similar, is that narration is simple and clear, and I will not elaborate.
The power inverter of aforementioned two-channel LED driver 100,200 and 400 is all using isolated changer, but sheet
Skilled person should be understood that the power inverter of two-channel LED driver may also be employed non-isolated converter, as Fig. 5 institute
Show.
Fig. 5 is the electrical block diagram of the two-channel LED driver 500 according to the embodiment of the present invention.Real shown in Fig. 5
Apply in example, the power inverter of the two-channel LED driver 500 includes liter-voltage-dropping type (buck-boost) changer.Described
Buck-boost changer includes：First winding 31；It is coupled to the master power switch 32 of the first winding 31, first winding 31
The storage energy when master power switch 32 is turned on, provides energy to the first and second passages when master power switch 32 disconnects
LED；First from power switch 34, is coupled to the first winding 31 and master power switch 32；Second from power switch 35, is coupled to
One winding 31 and master power switch 32.
In the embodiment shown in fig. 5, as its power inverter adopts buck-boost changer, therefore the first light modulation is opened
Pass 111 and the second dimmer switch 112 are that high-end (high-side) is configured, and need floating driving.
In the embodiment shown in fig. 5, as its power inverter is non-isolation type converter, therefore ratio dim signal
DIM0 without the need for via photoelectrical coupler 114, therefore, phase inverter 113 be coupled in selection circuit 110 and the first dimmer switch 111 it
Between.
Other circuit structures of two-channel LED driver shown in Fig. 5 500 and operation logic are driven with two-channel LED shown in Fig. 1
Dynamic device 100 is similar, is that narration is simple and clear, and I will not elaborate.
In the aforementioned two-channel LED driver according to various embodiments of the present invention, if there are open circuit feelings in one of channel LED
Condition, then the boost voltage V of driving voltageAUXWill be more than open circuit threshold value V when master power switch 32 disconnectsOVP,；And in power conversion
When the master power switch 32 of device is turned on, boost voltage VAUXIt is pulled low, open circuit detection signal OC becomes low level.Therefore, work as appearance
During a certain channel LED open circuit, open circuit detection signal OC is pulse signal, and its high level survival occurs and main work(in open-circuit condition
During the disconnection of rate switch 32.The high level of the pulse needs to be lockable, to ensure that respective channel LED is continuously turned off.
Fig. 6 schematically illustrates the selection circuit 110 of two-channel LED driver 600 according to embodiments of the present invention
Electrical block diagram.In the embodiment shown in fig. 6, the selection circuit 110 includes：RS latch 11, is input into set
End S, the RESET input R and outfan Q, wherein set input S receives open circuit detection signal OC, the RESET input R and receives system
The under-voltage latch signal UVLO of system, when the detection signal OC that opens a way indicates to have a channel LED open circuit situation occur, the RS is latched
Open-circuit condition is latched by device 11, produces open circuit latch signal OCL；Selecting switch 12, selects under the control of open circuit latch signal OCL
The second dim signal DIM2 or anti-phase latch signal DIML are selected as ratio dim signal DIM0, control the first dimmer switch
With the second dimmer switch.When the latch signal OCL that opens a way indicates wherein channel LED open circuit, selecting switch 12 selects anti-phase lock
Signal DIML is deposited as ratio dim signal DIM0；When the latch signal OCL that opens a way indicates not having arbitrary channel LED open circuit, choosing
Selecting switch 12 the second dim signal DIM2 is selected as ratio dim signal DIM0.
Other circuit structures of two-channel LED driver shown in Fig. 6 600 and operation logic are driven with two-channel LED shown in Fig. 1
Dynamic device 100 is similar, is that narration is simple and clear, and I will not elaborate.
Fig. 7 schematically illustrates the selection circuit 110 of two-channel LED driver 700 according to embodiments of the present invention
Electrical block diagram.In the embodiment shown in fig. 7, the selection circuit 110 includes：RS latch 11, as first passage LED
With second channel LED when wherein open circuit situation occurs in a passage, the response open circuit detection signal OC of RS latch 11 produces open circuit
Latch signal OCL, to latch the open-circuit condition of the open channel LED；Rp unit 13, receives open circuit latch signal OCL, produces
The raw open circuit inversion signal anti-phase with open circuit latch signal；First logical AND unit 14, to anti-phase latch signal DIML and open circuit
Latch signal OCL execution logic and computing, produce the first logical AND signal；Second logical AND unit 15, open-circuit inversion signal
With the second dim signal DIM2 execution logic and computing, the second logical AND signal is produced；Logic or unit 16, to the first logical AND
Signal and the second logical AND signal execution logic or computing, produce ratio dim signal DIM0, in order to control the first dimmer switch
111 and second dimmer switch 112.
When open circuit detection signal OC indicates a certain channel LED open circuit, then open circuit latch signal OCL is high level, and open circuit is anti-
Phase signals are low level.Accordingly, at the first logical AND unit 14, anti-phase latch signal DIML is transferred to logic or unit
16；At the second logical AND 15, the second dim signal DIM2 is shielded.Therefore, ratio dim signal DIM0 latches letter for anti-phase
Number DIML, the first dimmer switch 111 and the second dimmer switch 112 are controlled by anti-phase latch signal DIML.Conversely, when open circuit detection
Signal OC indicates that first passage LED and second channel LED does not all open a way, then open circuit latch signal OCL is low level, and open circuit is anti-
Phase signals are high level.Accordingly, at the first logical AND unit 14, anti-phase latch signal DIML is shielded；In the second logic
At 15, the second dim signal DIM2 is transferred to logic or unit 16.Therefore, ratio dim signal DIM0 is the second light modulation letter
Number DIM2, the first dimmer switch 111 and the second dimmer switch 112 are controlled by the second dim signal DIM2.
Other circuit structures of two-channel LED driver shown in Fig. 7 700 and operation logic are driven with two-channel LED shown in Fig. 1
Dynamic device 100 is similar, is that narration is simple and clear, and I will not elaborate.
Fig. 8 schematically illustrates the logic control of two-channel LED driver 800 according to embodiments of the present invention and driving
The electrical block diagram of circuit 64.In the embodiment shown in fig. 8, logic control and drive circuit 64 include：Comparator 81, connects
Receive thermal compensation signal CMP and sawtooth signal VSAW, wherein sawtooth signal VSAWWhen master power switch 32 is turned on linear on
Rise, be reset when master power switch 32 disconnects, 81 pairs of thermal compensation signals CMP of the comparator and sawtooth signal VSAWEnter
Row compares, and produces comparison signal；Logic circuit 82, receives and characterizes the electric current of the vice-side winding whether current zero-crossing signal of zero passage
ZCD (as detected by a tertiary winding) and comparison signal, produce logical signal, wherein the logical signal response current zero passage
Signal ZCD is set, respond comparison signal is reset；Driver element 83, receives logical signal, produces the drive control signal
Dr, in order to control the operation of master power switch 32.
In the embodiment shown in fig. 8, the logic circuit 82 includes rest-set flip-flop.
Other circuit structures of two-channel LED driver shown in Fig. 8 800 and operation logic are driven with two-channel LED shown in Fig. 1
Dynamic device 100 is similar, is that narration is simple and clear, and I will not elaborate.
There are open circuit feelings to the aforementioned two-channel LED driver according to the multiple embodiments of the present invention in a channel LED wherein
During condition, by corresponding open channel LED is disconnected, and keep another non-open channel LED persistently to light, continue to application scenario
Illumination is provided.If after first passage LED open circuit, second channel LED also opens a way, i.e., two channel LEDs are all opened a way
Situation, then need to close power stage, stop the operation of power inverter, to reduce power consumption, it is ensured that system safety.Below in conjunction with figure
9 are specifically described the circuit protection when two channel LEDs all occur open circuit.
Fig. 9 is the electrical block diagram of the two-channel LED driver 900 according to the embodiment of the present invention.Bilateral shown in Fig. 9
Road LED driver 900 is similar to two-channel LED driver shown in Fig. 1 100, different from two-channel LED driver shown in Fig. 1 100
, two-channel LED driver shown in Fig. 9 900 also includes：Over-pressed decision circuit 120, receives open circuit detection signal OC, judges
Boost voltage VAUXWhether continuously N number of cycle (as continuous 4 cycles) all occur higher than open circuit threshold value VOVPPulse (judge first
Whether channel LED and second channel LED are in open-circuit condition), when result of determination is boost voltage VAUXContinuous setting cycle is equal
Occur higher than open circuit threshold value VOVPPulse, then first passage LED and second channel LED be in open-circuit condition, overvoltage judges electricity
Road 120 produces overvoltage protection signal OVP, to close power control circuit, stops the work of power inverter.N is natural number, can
To be set according to practical situation.
Specifically, it is assumed that open circuit situation occurs in first passage LED 1001, then its corresponding first dimmer switch, 111 quilt
Remain open, corresponding second dimmer switch 112 of second channel LED 1002 is kept constant conduction so that second channel LED
1002 continue to provide illumination to application scenario.If second channel LED 1002 at a time also open circuit situation occurs, aid in
Voltage VAUXOpen circuit threshold value V will be exceeded againOVP, the detection signal OC that now opens a way is uprised again, up to power inverter
Master power switch 32 is switched in next cycle, to indicate that open circuit situation also occurs in another channel LED.Over-pressed decision circuit
120 receive this open circuit detection signal OC, and judge in ensuing setting cycle, and whether open circuit detection signal OC arteries and veins continuously occurs
Signal is rushed, indicates that open circuit situation also occurs in another channel LED.When the open circuit continuous setting cycle of detection signal OC (as continuous 2 or
4 cycles) there is pulse signal, then overvoltage 120 output over-voltage protection signal OVP of decision circuit, to close power control circuit
(as dragged down drive control signal Dr, shield guard control signal Dr etc.), stops the work of power inverter, so as to reduce
Power consumption, it is ensured that system is not over-pressed so that safety is protected.
Figure 10 schematically illustrates the over-pressed decision circuit of two-channel LED driver 1000 according to embodiments of the present invention
120 electrical block diagram.In the embodiment shown in fig. 10, the overvoltage decision circuit 120 includes：Rest-set flip-flop 21, tool
There is set end S, open circuit detection signal OC, reset terminal R is received, receives reset signal Gatef for characterizing drive control signal Dr, institute
The trailing edge that rest-set flip-flop 21 responds drive control signal Dr is stated, open circuit detection signal OC is transmitted to its first outfan Q, and
The inversion signal of open circuit detection signal OC is produced in its second outfan/Q；D-latch 22, with input D, clock end clk
The the second outfan/Q for rest-set flip-flop 21 being coupled to outfan Q, its input D receives the anti-phase letter of open circuit detection signal OC
Number, its clock end clk receives the square-wave signal Gater for characterizing drive control signal Dr, and the D-latch 22 responds drive control
The rising edge of signal Dr, by the inverted signal transmission of open circuit detection signal OC to its outfan Q；Enumerator 23, with input
I, reset terminal R and outfan O, wherein input I receive open circuit detection signal OC, the response open circuit detection signal of the enumerator 23
Rising edge count, the inversion signal of response open circuit detection signal is reset, and when counting reaches setting value, produces overvoltage protection letter
Number OVP, to close power control circuit, stops the work of power inverter.If enumerator 23 is not reaching to set in counting
During value, its reset terminal R is resetted by the output of D-latch 22, then enumerator is cleared, and overvoltage protection signal OVP is not to power control
Circuit generation effect processed.
As it was previously stated, when two channel LEDs are all opened a way, open circuit detection signal OC is continuous impulse signal (during its high level
Between during disconnection for master power switch 32).When the master power switch 32 of power inverter disconnects, boost voltage VAUXExceed
Open circuit threshold value VOVP, open circuit detection signal OC is changed into high level, and rest-set flip-flop 21 responds the trailing edge of drive control signal Dr (i.e.
The disconnection of response master power switch 32), the inversion signal (low level) of the open circuit detection signal OC of the high level is transmitted to which
Second outfan/Q.Accordingly, D-latch 22 is output as low level, does not execute reset to enumerator 23.When 23 sound of enumerator
When the continuous impulse of detection signal OC of should opening a way is counted and reached setting value, overvoltage protection signal OVP is changed into high level, will
Power control circuit 106 is closed, and so that power inverter is quit work, and reduces power consumption, it is ensured that system safety.If in enumerator not
Before reaching setting value, open circuit detection signal OC certain cycle do not occur pulse (i.e. within the cycle, detection signal of opening a way
OC is low level always), then rest-set flip-flop 21 responds the trailing edge of drive control signal Dr, by the low level open circuit detection letter
The inversion signal (high level) of number OC is transmitted to its second outfan/Q.Accordingly, D-latch 22 receives the input of the high level
Signal, and the rising edge of next Periodic signal drive control signal Dr is responded, transmit it to outfan Q.Then enumerator 23 is answered
Position resets, and overvoltage protection signal OVP is low level, not to power control circuit generation effect.
The invention allows for a kind of open-circuit-protection method of two-channel LED driver.Figure 11 diagrammatically illustrates basis
The open-circuit-protection method flow diagram 1100 of the two-channel LED driver of the embodiment of the present invention.The two-channel LED driver in order to
First passage LED and second channel LED is driven, methods described includes：
Step 1101, receives input voltage, driving current is produced, in order to drive the first and second channel LEDs.
Step 1102, the first dim signal of receiving user's input and Regulate signal.
Step 1103, Regulate signal is synchronized with input voltage, obtains the second dim signal.
Step 1104, adjusts the total current of the first and second channel LEDs according to the first dim signal.
Step 1105, monitors the open circuit situation of first passage LED and second channel LED, open circuit occurs when there is a channel LED
During situation, step 1106 is entered；When open circuit situation all do not occur in the first and second channel LEDs, step 1107 is entered.
Step 1106, keeps the open-circuit condition of corresponding open channel, is remain on another passage.
Step 1107, adjusts the light modulation ratio of first passage LED and second channel LED according to the second dim signal.
In one embodiment, the step 1106 " keeps the open-circuit condition of the open channel, keeps another passage
Light " include：The rp state of the open-circuit condition and the second dim signal is latched, and according to the anti-of the second dim signal for latching
Phase signals adjust the light modulation ratio of first passage LED and second channel LED.
In one embodiment, Regulate signal " is synchronized with input voltage, obtains the second light modulation by the step 1103
Signal " includes：Judge the zero passage situation of input voltage, zero passage detection signal is produced in input voltage zero passage；Response zero passage inspection
Survey signal the second dim signal resets, response regulation signal is by the second dim signal set.
In one embodiment, methods described also includes：Continue to monitor the open circuit of first passage LED and second channel LED
Situation, if first passage LED and second channel LED are in open-circuit condition, closes the power stage of two-channel LED driver.
Although the present invention is exemplary embodiment described with reference to several, it is to be understood that, term used is to illustrate and show
Example property and nonrestrictive term.As the present invention can be embodied as spirit or reality without deviating from invention in a variety of forms
Matter, it should therefore be appreciated that above-described embodiment is not limited to any aforesaid details, and the spirit that should be limited in appended claims
Widely explain with scope, therefore fall into claim or the whole changes in its equivalent scope and remodeling all should be the power of enclosing
Profit requires to be covered.
Claims (10)
1. a kind of two-channel LED driver, drives first passage LED and second channel LED, the two-channel LED driver bag
Include：
Power inverter, is that first and second channel LED provides driving voltage and driving current, the wherein switch converters
Including：First winding and the master power switch of the first winding is coupled to, first winding is deposited when master power switch is turned on
Energy storage capacity, when master power switch disconnects, energy is provided to the first and second channel LEDs；
Power control circuit, receives the first dim signal of wireless control module offer and characterizes the electric current for flowing through master power switch
Current sampling signal, produce drive control signal in order to control master power switch；
Comparison circuit, compares the size of the boost voltage for characterizing driving voltage and open circuit threshold value, judges first passage LED or second
Whether channel LED opens a way, and produces open circuit detection signal；
Latch cicuit, receives the second dim signal and the open circuit detection signal of wireless control module offer, when open circuit detection signal
When indicating first passage LED or second channel LED open circuit, the inversion signal of the second dim signal is latched by the latch cicuit,
Produce anti-phase latch signal；
First dimmer switch, is coupled to first passage LED, and first passage LED is dimmed；
Second dimmer switch, is coupled to second channel LED, and second channel LED is dimmed, second dimmer switch and
The complementary conducting of one dimmer switch；Wherein
When first passage LED or second channel LED open circuit, the first dimmer switch and the second dimmer switch are by anti-phase latch signal
Control conducting and disconnection；
When first passage LED and second channel LED all do not open a way, the first dimmer switch and the second dimmer switch are adjusted by second
Optical signal control conducting and disconnection.
2. two-channel LED driver as claimed in claim 1, the wherein power inverter receive AC-input voltage, and
Driving voltage and driving current, the wireless controlled molding is provided based on AC-input voltage for first and second channel LED
Block includes：
User input module, provides the first dim signal and the Regulate signal of user input；
Zero-crossing comparator, compares the size of input sample signal and null value reference signal, produces zero passage detection signal；
Synchronizer trigger, produces the second dim signal；Wherein the second dim signal response zero passage detection signal is reset, rings
Regulate signal is answered to be set.
3. two-channel LED driver as claimed in claim 1, also includes selection circuit, to the second dim signal and its anti-phase
Latch signal is selected, wherein
When detection signal of opening a way indicates first passage LED or second channel LED open circuit, the selection circuit selects anti-phase latch
Signal is controlling the first dimmer switch and the second dimmer switch；
When detection signal of opening a way indicates that first passage LED and second channel LED does not all open a way, the selection circuit selects the
Two dim signals are controlling the first dimmer switch and the second dimmer switch.
4. two-channel LED driver as claimed in claim 3, wherein selection circuit includes：
RS latch, when open circuit feelings occurs in the wherein passage that open circuit detection signal indicates first passage LED and second channel LED
During condition, open-circuit condition is latched by the RS latch, produces open circuit latch signal；
Selecting switch, is controlled by open circuit latch signal, selects the second dim signal or anti-phase latch signal to control first
Dimmer switch and the second dimmer switch.
5. two-channel LED driver as claimed in claim 3, wherein selection circuit includes：
RS latch, when open circuit feelings occurs in the wherein passage that open circuit detection signal indicates first passage LED and second channel LED
During condition, open-circuit condition is latched by the RS latch, produces open circuit latch signal；
Rp unit, produces the open circuit inversion signal anti-phase with open circuit latch signal；
First logical AND unit, to anti-phase latch signal and open circuit latch signal execution logic and computing, produces the first logical AND
Signal；
Second logical AND unit, open-circuit inversion signal and the second dim signal execution logic and computing, produce the second logical AND
Signal；
Logic or unit, to the first logical AND signal and the second logical AND signal execution logic or computing, in order to control the first tune
Photoswitch and the second dimmer switch.
6. two-channel LED driver as claimed in claim 1, also includes over-pressed decision circuit, receives open circuit detection signal, when
In continuously N number of cycle, open circuit detection signal all indicates that the pulse more than open circuit threshold value occurs in boost voltage, over-pressed decision circuit is produced
Raw overvoltage protection signal, to close power control circuit, wherein N is natural number.
7. two-channel LED driver as claimed in claim 6, wherein the overvoltage decision circuit include：
Rest-set flip-flop, responds the trailing edge of drive control signal, produces the inversion signal of open circuit detection signal；
D-latch, responds the rising edge of drive control signal, by the inverted signal transmission of open circuit detection signal to its outfan；
Enumerator, the rising edge counting of response open circuit detection signal, the inversion signal of response open circuit detection signal are reset, and work as meter
Number reaches setting value, produces overvoltage protection signal, to close power control circuit.
8. a kind of open-circuit-protection method of two-channel LED driver, the two-channel LED driver is in order to drive first passage
LED and second channel LED, methods described includes：
Receives input voltage, produces driving current, in order to drive the first and second channel LEDs；
First dim signal of receiving user's input and Regulate signal；
Regulate signal is synchronized with input voltage, obtains the second dim signal；
The total current of the first and second channel LEDs is adjusted according to the first dim signal；
The open circuit situation of monitoring first passage LED and second channel LED, when there is a channel LED open circuit situation occur, keeps phase
The open-circuit condition of open channel is answered, is remain on another passage；When open circuit feelings all do not occur in the first and second channel LEDs
Condition, adjusts the light modulation ratio of first passage LED and second channel LED according to the second dim signal.
9. method as claimed in claim 8, the step " keeps the open-circuit condition of the open channel, protects another passage
Hold and light " include：The rp state of the open-circuit condition and the second dim signal is latched, and according to the second dim signal for latching
Inversion signal adjusts the light modulation ratio of first passage LED and second channel LED.
10. method as claimed in claim 8, also includes：Continue to monitor the open circuit feelings of first passage LED and second channel LED
Condition, if first passage LED and second channel LED are in open-circuit condition, closes the power stage of two-channel LED driver.
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| CN201610860946.4A CN106455205B (en) | 2016-09-29 | 2016-09-29 | Dual-channel L ED driver and open-circuit protection method thereof |
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| CN201610860946.4A CN106455205B (en) | 2016-09-29 | 2016-09-29 | Dual-channel L ED driver and open-circuit protection method thereof |
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| CN110690822A (en) * | 2018-07-06 | 2020-01-14 | 立锜科技股份有限公司 | Flyback power supply circuit with overvoltage protection and primary side control circuit thereof |
| US11729883B1 (en) * | 2021-08-30 | 2023-08-15 | Universal Lighting Technologies, Inc. | LED driver with auxiliary output and low standby power |
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| CN102378435A (en) * | 2010-08-16 | 2012-03-14 | 英飞特电子（杭州）有限公司 | Open circuit protection circuit of light-emitting diode constant current driving circuit |
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