CN110312346A - LED drive chip and LED drive system - Google Patents
LED drive chip and LED drive system Download PDFInfo
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- CN110312346A CN110312346A CN201910676069.9A CN201910676069A CN110312346A CN 110312346 A CN110312346 A CN 110312346A CN 201910676069 A CN201910676069 A CN 201910676069A CN 110312346 A CN110312346 A CN 110312346A
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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]
- H05B45/10—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]
- 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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Abstract
The present invention relates to LED drive chips and LED drive system, comprising: input switch detection circuit detects the state of input switch according to the power-up state of energization pins and exports detection signal；Logic control circuit receives and exports enable signal according to scheduled logical order according to detection signal；Constant-current control circuit, receive and according to enable signal output drive signal, to control the working condition of coupled LED；And role's configuration pin of role's configuration is carried out to LED drive chip according to exterior arrangement circuit；Scheduled logical order includes the first logical order and the second logical order, and when LED drive chip is configured to first role chip, and logic control circuit exports enable signal according to the first logical order；When LED drive chip is configured to second role chip, logic control circuit exports enable signal according to the second logical order.The circuit structure that can simplify LED color temperature adjustment using the LED drive chip is reduced the cost of driving power and reduces volume.
Description
Technical field
The present invention relates to the technical fields of LED illumination, more specifically to a kind of LED drive chip and LED driving system
System.
Background technique
With the continuous expansion of LED illumination application range, LED illumination is also from best single illumination functions gradually to intelligence
Change, hommization and energy saving direction develop.To meet people under different scenes to the requirement of light, has switch toning temperature function
LED illumination lamp come into being.
In existing adjusting colour temperature scheme, when two kinds of lamp beads are all lighted, since driving current immobilizes, so at this
When state, the half of brightness when the half namely brightness that the electric current for flowing through two kinds of lamp beads is full-load current are monochromatic.In order to most
LED lamp bead is utilized to limits, the output power for making driving power in colour mixture is needed to double.Popular way is at present
Two independent LED drive powers are controlled using a switch detection circuit, i.e., double constant-current supply systems.Work as colour mixture
When, two driving powers are opened simultaneously, and the LED lamp bead whole full power connecting with each power supply is lighted, while realizing colour mixture
Lumens double.Although this kind of scheme can make full use of LED lamp bead, circuit structure is excessively complicated, causes power supply PCB surface
Product is too big, and cost is excessively high.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of LED drive chip
And LED drive system.
The technical solution adopted by the present invention to solve the technical problems is: providing a kind of LED drive chip, comprising:
Input switch detection circuit, the input switch detection circuit are opened according to the detection input of the power-up state of energization pins
The state of pass, and export detection signal；
Logic control circuit, the logic control circuit connect with the input switch detection circuit, receive and according to institute
It states detection signal and exports enable signal according to scheduled logical order；
Constant-current control circuit, the constant-current control circuit connect with the logic control circuit, receive and made according to described
Energy signal output drive signal, to control the working condition of coupled LED；And
Role's configuration pin of role's configuration is carried out to the LED drive chip according to exterior arrangement circuit；
The scheduled logical order includes the first logical order and the second logical order, and the LED drive chip is matched
When being set to first role chip, the logic control circuit exports the enable signal according to first logical order；It is described
When LED drive chip is configured to second role chip, the logic control circuit is according to described in second logical order output
Enable signal.
In one embodiment, further includes: for sending or receiving the synchronously control pin of synchronization signal, and make to pass through institute
The first role chip and second role chip synchronization for stating synchronously control pin interconnection export the enable signal, with synchronous driving
The LED that the first role chip and second role chip respectively connect.
In one embodiment, the logic control circuit includes:
Role's configuration module, for according to the identification signal from the exterior arrangement circuit in role's configuration pin
Carry out role's identification, with according to recognition result output for control logic sequence first configuration signal, second configuration signal, with
And the third of the over-voltage protection point for setting the constant-current control circuit configures signal；
Synchronization control module is connect, for being matched according to the detection signal and described first with role's configuration module
Confidence number generates and exports the pulse triggering signal changed for state；
Status control module is connect, for according to institute respectively with role's configuration module and the synchronization control module
Pulse triggering signal, the first configuration signal and the second configuration signal are stated, with the first logical order or the second logic
Enable signal described in Sequential output.
In one embodiment, role's configuration module includes:
Connect with role's configuration pin, for generating the first configuration signal and the second configuration signal
One configuration signal and the second configuration signal generating circuit；
It connect with role's configuration pin, generate electricity for generating the third configuration signal of the third configuration signal
Road.
In one embodiment, the first configuration signal and the second configuration signal generating circuit include: current source, first
Comparator, the first NOT gate and the second NOT gate；The third configuration signal generating circuit includes: to export under different role's configurations
Adjusting circuit with identical over-voltage protection point；
The output end of the current source connects role's configuration pin, and the anode of the first comparator connects the angle
The cathode of color configuration pin, the first comparator connects the second reference potential, and the output stage of the first comparator successively connects
Connect first NOT gate and second NOT gate；Wherein, the first NOT gate output the first configuration signal, described second is non-
Door output the second configuration signal；
The adjusting circuit connection is in role's configuration pin.
In one embodiment, the synchronization control module include: pull-up current source, signal processing circuit, pull-down circuit,
And output circuit；
The signal processing circuit is separately connected the input switch detection circuit, role's configuration module and described
The control terminal of pull-down circuit, the first end of the pull-down circuit connect the synchronously control pin, the pull-up current source it is defeated
The input terminal of outlet and the output circuit, the second end ground connection of the pull-down circuit, the output end of the output circuit connect
Connect the status control module.
In one embodiment, the signal processing circuit includes: the first NAND gate and the 4th NOT gate, the pull-down circuit
It include: metal-oxide-semiconductor, the output circuit includes: third NOT gate；
The first input end of first NAND gate connects the input switch detection circuit to access the detection signal,
Second input terminal of first NAND gate connects role's configuration module to access the first configuration signal, and described first
The output end of NAND gate connects the input terminal of the 4th NOT gate；The output end of 4th NOT gate connects the grid of the metal-oxide-semiconductor
Pole, the source electrode ground connection of the metal-oxide-semiconductor, the drain electrode of the metal-oxide-semiconductor connect the synchronously control pin；
The input terminal of the third NOT gate connects the synchronously control pin, described in the output end connection of the third NOT gate
Status control module；
The grid of the metal-oxide-semiconductor is the control terminal of the pull-down circuit, and the source electrode of the metal-oxide-semiconductor is the pull-down circuit
Second end, the drain electrode of the metal-oxide-semiconductor are the first end of the pull-down circuit.
In one embodiment, the status control module includes: pulse-generating circuit, state storage unit and decoding electricity
Road；
The pulse-generating circuit is connect, to receive the pulse triggering signal and export arteries and veins with the synchronization control module
Rush signal；
The state storage unit is connect, to receive the pulse signal and status signal with the pulse-generating circuit,
And the status signal according to the output of pulse signal；
The decoding circuit is connect, to receive the state letter with the state storage unit and role's configuration module
Number and it is described first configuration signal and second configuration signal, and according to it is described first configuration signal and second configuration signal to described
Status signal is decoded, to export the enable signal.
In one embodiment, the input switch detection circuit includes: bleeder circuit and the second comparator；
The input terminal of the bleeder circuit connects the energization pins, the output end connection described second of the bleeder circuit
The anode of comparator, the cathode of second comparator connect the first reference potential, the output stage output of second comparator
The detection signal.
The present invention also provides a kind of LED drive systems, comprising: at least two LED drive chips as described above；
At least two LED drive chip is respectively used to driving and the colour temperature LED that is respectively correspondingly connected with, and it is described at least
Two LED drive chips are connected by synchronously control pin.
In one embodiment, at least two LED drive chip includes: the first chip and the second chip；Further include:
First configuration circuit, the first driving circuit, the second configuration circuit and the second driving circuit；
Role's configuration pin of first chip is grounded by the first configuration circuit, and the driving letter of first chip
Number output pin is connect with first driving circuit, the colour temperature that first driving circuit and first chip are correspondingly arranged
LED connection；
Role's configuration pin of second chip is grounded by the second configuration circuit, and the driving letter of second chip
Number output pin is connect with second driving circuit, the colour temperature that second driving circuit and second chip are correspondingly arranged
LED connection；
When first chip and the second chip are identified as first role chip, second role chip, described first
Role's chip detects input switch state and is carried out by the synchronously control pin to the second role chip same
Step control.
In one embodiment, further includes: rectification circuit and high-voltage capacitance；
The input terminal of the rectification circuit is connect with input switch, the output end of the rectification circuit and the high-voltage capacitance
First end connection, the high-voltage capacitance second end ground connection；The energization pins of first chip and second chip
Energization pins connect the first end of the high-voltage capacitance.
In one embodiment, the resistance value of first configuration circuit is different from the resistance value of second configuration circuit.
In one embodiment, the resistance value ratio of the resistance value of first configuration circuit and second configuration circuit is n,
In, n=2,3,4 ..., 8.
Implement LED drive chip of the invention, has the advantages that include: input switch detection circuit, according to confession
The state of the power-up state detection input switch of electric pin simultaneously exports detection signal；Logic control circuit receives and according to detection
Signal exports enable signal according to scheduled logical order；Constant-current control circuit receives and is believed according to enable signal output driving
Number, to control the working condition of coupled LED；And role is carried out to LED drive chip according to exterior arrangement circuit and is matched
The role's configuration pin set；Scheduled logical order includes the first logical order and the second logical order, and LED drive chip is matched
When being set to first role chip, logic control circuit exports enable signal according to the first logical order；LED drive chip is configured to
When second role chip, logic control circuit exports enable signal according to the second logical order.Use the LED drive chip can be with
The circuit structure for simplifying LED color temperature adjustment reduces the cost of driving power and reduces volume.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the logic diagram of LED drive chip provided in an embodiment of the present invention；
Fig. 2 is the logic diagram of logic control circuit provided in an embodiment of the present invention；
Fig. 3 is the circuit diagram of role's configuration module provided in an embodiment of the present invention；
Fig. 4 is the circuit diagram of synchronization control module provided in an embodiment of the present invention；
Fig. 5 is the circuit diagram of status control module provided in an embodiment of the present invention；
Fig. 6 is the circuit diagram of input switch detection circuit provided in an embodiment of the present invention；
Fig. 7 is the circuit diagram of LED drive system provided in an embodiment of the present invention；
Fig. 8 is the waveform diagram of logical order provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to solve the problems of existing LED colour temperature adjusts circui, the present invention provides a kind of LED to drive core
Piece, the LED drive chip can detect the state of input switch automatically, and the state based on input switch generates corresponding enable
Signal is to drive the working condition of the LED of corresponding setting to reduce and drive to reach the circuit structure of simplified LED color temperature adjustment
The cost of dynamic power supply and the purpose for reducing volume.
Specifically, as shown in Figure 1, the LED drive chip 300 includes: input switch detection circuit 301, input switch inspection
Slowdown monitoring circuit 301 detects the state of input switch according to the power-up state of energization pins HV, and exports detection signal；Logic control electricity
Road 303, logic control circuit 303 connect with input switch detection circuit 301, receive and patrolled according to detection signal according to scheduled
Collect Sequential output enable signal；Constant-current control circuit 302, constant-current control circuit 302 connect with logic control circuit 303, receive
And according to enable signal output drive signal, to control the working condition of coupled LED；And according to exterior arrangement electricity
Road carries out role's configuration pin OVP of role's configuration to LED drive chip 300.
In the embodiment of the present invention, scheduled logical order includes the first logical order and the second logical order, and LED drives
When chip 300 is configured to first role chip, logic control circuit 303 exports enable signal according to the first logical order；LED drives
When dynamic chip 300 is configured to second role chip, logic control circuit 303 exports enable signal according to the second logical order.It can
To understand ground, the LED drive chip 300 of the embodiment of the present invention can be real by the control according to external equipment or control circuit
The color temperature adjustment control of existing LED can also realize that the color temperature adjustment of LED controls by the adjusting control according to its own.Wherein, root
Existing control mode can be used according to the control mode of external equipment or control circuit, the present invention is not especially limited.
Further, the LED drive chip 300 of the embodiment of the present invention further include: for sending or receiving synchronization signal
Synchronously control pin CTL.Specifically, can be made by setting synchronously control pin CTL through synchronously control pin CTL
The first role chip and second role chip synchronization of interconnection export enable signal, drive first role chip and second with synchronous
The LED that role's chip respectively connects.It should be noted that first role chip can be made by synchronously control pin CTL
Enable signal is exported according to the first logical order, second role chip is made to export enable signal according to the second logical order.Wherein,
First logical order and the second logical order difference.By synchronously control pin CTL, may be implemented LED drive chip 300 it
Between synchronously control.
Further, in a specific embodiment, as shown in Fig. 2, the logic control circuit 303 may include: role
Configuration module 502, synchronization control module 501 and status control module 503.
Wherein, role's configuration module 502, for according to the identification from exterior arrangement circuit on role's configuration pin OVP
Signal carries out role's identification, to configure signal sl1, the second configuration for the first of control logic sequence according to recognition result output
The third of signal sl2 and the over-voltage protection point for setting constant-current control circuit 302 configures signal ovp_out.The present invention is real
It applying in example, the first configuration signal sl1 and the second configuration signal sl2 are different signals, further, the second configuration signal sl2
It is the first configuration signal sl1 by not circuit treated signal, phase and the first configuration signal sl1 opposite in phase, i.e.,
When the first configuration signal sl1 is high level signal, the second configuration signal sl2 is low level signal, on the contrary, working as first matches confidence
When number sl1 is low level signal, the second configuration signal sl2 is high level signal.
In a specific embodiment, as shown in figure 3, role's configuration module 502 may include: and role's configuration pin
OVP connection, the first configuration signal and the second configuration signal for generating the first configuration signal sl1 and the second configuration signal sl2
Generation circuit；It connect with role's configuration pin OVP, generated for generating the third configuration signal of third configuration signal ovp_out
Circuit.
Wherein, the first configuration signal and the second configuration signal generating circuit may include: current source 700, first comparator
701, the first NOT gate 702 and the second NOT gate 703.
The output end of current source 700 connects role's configuration pin OVP, anode connection role's configuration of first comparator 701
The cathode of pin OVP, first comparator 701 connect the second reference potential, and the output stage of first comparator 701 is sequentially connected first
NOT gate 702 and the second NOT gate 703；Wherein, the first configuration of the first NOT gate 702 output signal sl1, the second NOT gate 703 output second
Configure signal sl2.
Third configuration signal generating circuit includes: the tune that output has identical over-voltage protection point under different role's configurations
Economize on electricity road, wherein the adjusting circuit connection is in role's configuration pin OVP.It is to be appreciated that as shown in figure 3,704 in Fig. 3 can
For by the signal accessed divided by being exported again after n to 707, wherein 707 be transmission gate, and when 707 conducting, 704 signal can be defeated
When closing out to constant-current control circuit 302,707,704 signal cannot be exported；Further, 705 in Fig. 3 are will to be accessed
Signal carry out except 1 operation, and signal generating circuit is configured by the third that transmission gate 706 is transmitted to role's configuration module 502
Output end, wherein transmission gate 706 be connected when 705 signal can export, transmission gate 706 close when, 705 signal cannot
Output.It should be noted that 704~707 only symbol signal in Fig. 3, does not represent specific circuit or device.
As shown in figure 3, a current source 700 built in role's configuration module 502, the electric current of the current source 700 are matched from role
Pin OVP outflow is set, and flows through exterior arrangement circuit (in the implementation column, it is real that exterior arrangement circuit can pass through OVP resistance 708
It is existing), it flows through voltage caused by exterior arrangement circuit (OVP voltage) and passes through first comparator 701 and internal reference voltage
(the second reference potential Ref2) is compared.When OVP voltage is greater than the voltage of the second reference potential, first comparator 701 is defeated
High level out, at this point, the first configuration signal sl1 is low level, the second configuration signal sl2 is high level.When OVP voltage is less than
When the voltage of two reference potentials, first comparator 701 export low level, at this point, first configuration signal sl1 be high level, second
Configuration signal sl2 is low level.LED drive chip 300 determines its role by the size of OVP resistance 708, that is, determines that it is
First role chip or second role chip.In a specific embodiment, when OVP resistance 708 is smaller, LED drives core
Piece 300 is determined as first role chip, when OVP resistance 708 is than the outer connecting resistance of the chip interconnected with the LED drive chip 300
Hour, which is determined as second role chip.
It further, will certainly since LED drive chip 300 is to determine its role by the size of OVP resistance 708
Cause the outer connecting resistance of two LED drive chips 300 different, and the outer connecting resistance of two LED drive chips 300 is for setting
Determine over-voltage protection point, therefore, in order to keep the OVP voltage of two LED drive chips 300 identical, needs to second role core
The OVP voltage of piece does the operation of a 1/n, i.e., the OVP voltage of second role chip is reduced to 1/n and then is input to perseverance
Flow control circuit 302, to reach the third that the constant-current control circuit 302 in first role chip and second role chip accesses
It is identical to configure signal ovp_out, guarantees that first role chip is identical with the OVP point of second role chip.
In the embodiment of the present invention, synchronization control module 501 is connect, for according to detection signal with role's configuration module 502
It is generated with the first configuration signal sl1 and exports the pulse triggering signal CTLb changed for state.
Further, the synchronization control module 501 include: pull-up current source 600, signal processing circuit, pull-down circuit, with
And output circuit.
Wherein, the signal processing circuit be separately connected input switch detection circuit 301, role's configuration module 502 and under
The control terminal of puller circuit, pull-down circuit first end connection synchronously control pin CTL, pull-up current source 600 output end and
The input terminal of output circuit, the second end ground connection of pull-down circuit, the output end connection status control module 503 of output circuit.This
In inventive embodiments, the detection signal and role that signal processing circuit is used to export input switch detection circuit 301 configure mould
The first configuration signal sl1 that block 502 exports is handled, to input conducting or the pass of corresponding control signal control pull-down circuit
It is disconnected, wherein when the LED drive chip 300 is configured as first role chip, pull-down circuit conducting, when the LED drive chip
300 when being configured as second role chip, and pull-down circuit turns off (disconnection).Output circuit is for handling synchronization signal
Afterwards, pulse triggering signal CTLb is exported.
As shown in figure 4, in a specific embodiment, signal processing circuit includes: the first NAND gate 604 and the 4th NOT gate
603, pull-down circuit includes: metal-oxide-semiconductor 602, and output circuit includes: third NOT gate 601.
The first input end connection input switch detection circuit 301 of first NAND gate 604 to access detection signal, first with
NOT gate 604 the second input terminal connection role's configuration module 502 with access first configuration signal sl1, the first NAND gate 604 it is defeated
Outlet connects the input terminal of the 4th NOT gate 603；The grid of the output end connection metal-oxide-semiconductor 602 of 4th NOT gate 603, metal-oxide-semiconductor 602
The drain electrode of source electrode ground connection, metal-oxide-semiconductor 602 connects synchronously control pin CTL；The input terminal connection synchronously control of third NOT gate 601 is drawn
Foot CTL, the output end connection status control module 503 of third NOT gate 601.Wherein, the grid of metal-oxide-semiconductor 602 is pull-down circuit
Control terminal, the source electrode of metal-oxide-semiconductor 602 are the second end of pull-down circuit, and the drain electrode of metal-oxide-semiconductor 602 is the first end of pull-down circuit.
As shown in figure 4, the first NAND gate 604 is connect when the LED drive chip 300 is configured as first role chip
The the first configuration signal sl1 entered is high level, and metal-oxide-semiconductor 602 is controlled by the detection signal that input switch detection circuit 301 exports.
When the LED drive chip 300 is configured as second role chip, the first NAND gate 604 accessed first configuration signal sl1
For low level, at this point, the grid of metal-oxide-semiconductor 602 is low potential, metal-oxide-semiconductor 602 is in an off state, so synchronization signal can only be by
First role chip controls, second role chip can not control synchronization signal.
In Fig. 4, signal processing circuit is realized by a NAND gate and NOT gate, it will of course be understood that ground, in some other implementation
Example in, signal processing circuit can directly by with non-realization, however it is not limited to circuit structure shown in Fig. 4.
In the embodiment of the present invention, status control module 503, respectively with role's configuration module 502 and synchronization control module 501
Connection configures signal sl2 for configuring signal sl1 and second according to pulse triggering signal CTLb, first, with the first logical order
Or second logical order export enable signal.
Further, which may include: pulse-generating circuit 800, state storage unit and decoding
Circuit.
Pulse-generating circuit 800 is connect, to receive pulse triggering signal CTLb and export pulse with synchronization control module 501
Signal.
State storage unit is connect, with return pulse signal and status signal with pulse-generating circuit 800, and according to pulse
Signal output status signal.Wherein, the state storage unit of the embodiment of the present invention can be realized by d type flip flop.
In a specific embodiment, as shown in figure 5, the state storage unit may include: 801 He of the first d type flip flop
Second d type flip flop 802.In Fig. 5, enp is the power-on reset signal inside the driving chip, and st1 is first state signal, st2
For the second status signal.
Decoding circuit is connect with state storage unit and role's configuration module 502, is configured with reception state signal and first
The configuration signal sl2 of signal sl1 and second, and status signal is carried out according to the first configuration signal sl1 and the second configuration signal sl2
Decoding, to export enable signal.
In the embodiment of the present invention, which can be realized by some logic gates.
In a specific embodiment, as shown in figure 5, the decoding circuit may include: nor gate 805, the 5th NOT gate
806, the second NAND gate 807, third NAND gate 808, the 4th NAND gate 809, the 6th NOT gate 810, the 7th NOT gate the 811, the 5th with
NOT gate 812 and the 8th NOT gate 813.
Wherein, the first input end of nor gate 805 is connect, to access first state with the output end of the first d type flip flop 801
Signal, the second input terminal of nor gate 805 are connect, to access the second status signal with the output end of the second d type flip flop 802, or
The output end of NOT gate 805 connects the input terminal of the 5th NOT gate 806, and the output end of the 5th NOT gate 806 connects the second NAND gate 807
First input end, the second input terminal access the first configuration signal sl1 of the second NAND gate 807, the output end of the second NAND gate 807
The first input end of third NAND gate 808 is connected, the second input terminal of third NAND gate 808 connects the defeated of the 5th NAND gate 812
Outlet, the output end of third NAND gate 808 connect the first input end of the 4th NAND gate 809, and the second of the 4th NAND gate 809 is defeated
Enter to hold the output end of the 8th NOT gate 813 of connection, the input terminal of output end the 6th NOT gate 810 of connection of the 4th NAND gate 809, the 6th
The enable signal input terminal of the output end connection constant-current control circuit 302 of NOT gate 810.The first input end of 5th NAND gate 812
Access the second configuration signal sl2, the second input terminal of the 5th NAND gate 812 connect the output end of the 7th NOT gate 811, the 7th NOT gate
811 input terminal connects first state signal；The input terminal access detection signal of 8th NOT gate 813.In Fig. 5, the 8th non-813
The detection signal (as shown in the IN in Fig. 5) that input terminal is accessed, the IN are the detection that input switch detection circuit 301 exports
Signal hv_on.
In the embodiment of the present invention, input switch detection circuit 301 includes: bleeder circuit and the second comparator 402.
Wherein, the input terminal of bleeder circuit connects energization pins HV, and the output end of bleeder circuit connects the second comparator 402
Anode, the cathode of the second comparator 402 connects the first reference potential (Ref1), and the output stage of the second comparator 402 exports inspection
Survey signal.
In a specific embodiment, as shown in fig. 6, bleeder circuit may include: 400, second points of the first divider resistance
Piezoresistance 401.Logic circuit 403 may include: NOT gate.Wherein, the first end of the first divider resistance 400 is as bleeder circuit
Input terminal connection energization pins HV, the first end of second end the second divider resistance 401 of connection of the first divider resistance 400, and the
The connecting pin of the second end of one divider resistance 400 and the first end of the second divider resistance 401 connects as the output end of bleeder circuit
Connect the anode of the second comparator 402, the second end ground connection of the second divider resistance 401.
Further, the first divider resistance 400 of the embodiment of the present invention and second divider resistance 401 and LED drive core
Other devices in piece 300 can be set on a wafer.So as to effectively reduce PCB area occupied.
Further, the present invention also provides a kind of LED drive system, which drives including at least two LED
Chip, wherein at least two LED drive chip is LED drive chip disclosed in the embodiment of the present invention.
Specifically, the colour temperature LED that at least two LED drive chip is respectively used to driving and is respectively correspondingly connected with, and extremely
Few two LED drive chips are connected by synchronously control pin CTL.
In a specific embodiment, as shown in fig. 7, at least two LED drive chip includes: 206 He of the first chip
Second chip 207；Further include: the first configuration circuit 208, the first driving circuit, the second configuration circuit 209 and the second driving electricity
Road.Wherein, the first chip 206, the first configuration circuit 208, the first driving circuit form the first driving source 204；Second chip
207, the second configuration circuit 209, the second driving circuit form the second driving source 205.
Role's configuration pin OVP of first chip 206 is grounded by the first configuration circuit 208, and the drive of the first chip 206
Dynamic signal output pin (Drv) is connect with the first driving circuit, the colour temperature that the first driving circuit and the first chip 206 are correspondingly arranged
LED connection, i.e., as shown in fig. 7, being the first colour temperature LED light group 210 with the colour temperature LED that the first chip 206 is correspondingly arranged.
Role's configuration pin OVP of second chip 207 is grounded by the second configuration circuit 209, and the drive of the second chip 207
Dynamic signal output pin (Drv) is connect with the second driving circuit, the colour temperature that the second driving circuit and the second chip 207 are correspondingly arranged
LED connection, i.e., as shown in fig. 7, being the second colour temperature LED light group 211. with the colour temperature LED that the second chip 207 is correspondingly arranged
When first chip 206 and the second chip 207 are identified as first role chip, second role chip, first jiao
Color chip detect and synchronize second role chip by synchronously control pin CTL to the state of input switch 201
Control.
Further, as shown in fig. 7, the first driving circuit and the second driving circuit can pass through driving tube, resistance, electricity
Hold and related component realizes that the present invention is not specifically limited.
Further, as shown in fig. 7, the LED drive system further include: rectification circuit 202 and high-voltage capacitance 203.Wherein,
Rectification circuit 202 can be realized using existing rectification circuit, such as bridge rectifier.
The input terminal of rectification circuit 202 is connect with input switch, output end and the high-voltage capacitance 203 of rectification circuit 202
First end connection, the second end ground connection of high-voltage capacitance 203；The power supply of the energization pins HV of first chip 206 and the second chip 207
The first end of pin HV connection high-voltage capacitance 203.
Further, in the embodiment of the present invention, the resistance value of the resistance value of the first configuration circuit 208 and the second configuration circuit 209
It is different.
Specifically, the resistance value ratio of the resistance value of the first configuration circuit 208 and the second configuration circuit 209 is n, wherein n=2,3,
4,……,8.It will of course be understood that the resistance value ratio of ground, the first configuration circuit 208 and the second configuration circuit 209 is not limited to 2,3,
4 ..., 8, it can select to determine according to the demand of circuit or device in practical applications.
Further, the first configuration circuit 208 and the second configuration circuit 209 can be realized by resistance, wherein first
The resistance value of the resistance of configuration circuit 208 is different from the resistance value of resistance of the second configuration circuit 209.
Further, as shown in fig. 7,200 be alternating current source, when input switch 201 is closed, the electric energy streams of alternating current source 200
Enter rectification circuit 202, is charged by sending after 202 rectification of rectification circuit processing to high-voltage capacitance 203 to high-voltage capacitance 203.
As shown in fig. 7, the LED drive system is made of the first driving source 204 and the second driving source 205, wherein the first core
Piece 206 and the second chip 207 can automatically determine first according to the difference of the first configuration circuit 208 and the second configuration circuit 209
Role's chip and second role chip, wherein first role chip is used to control the movement of whole system, guarantees first role core
The consistency of piece and second role chip activity, and the logical order of first role chip and the logic of second role chip are suitable
Sequence is different.It should be noted that the first chip 206 and the second chip 207 can be identical chip, the two passes through respective same
Step control pin CTL is connected, wherein first role chip controls second role chip by synchronously control pin CTL.
As shown in fig. 7, the first chip 206 and the second chip 207 detect respective OVP resistance (i.e. first respectively when powering on
The resistance of configuration circuit 208 and the second configuration circuit 209), respective role is configured by the size of respective OVP resistance,
Wherein, resistance is small for first role chip, and resistance is greatly that second role chip in the specific implementation can also be in turn
Configuration.After the completion of role's configuration, first role chip exports enable signal according to the first logical order, and second role chip is pressed
Enable signal is exported according to the second logical order.Wherein, the enable signal that first role chip is exported according to the first logical order
Waveform is as shown in the 905 of Fig. 8, and the 906 of the waveform such as Fig. 8 for the enable signal that second role chip is exported according to the second logical order
It is shown.
As shown in figure 8, first role chip operation, second role chip does not work when high-voltage capacitance 203 powers on；When
Input switch 201 switchs primary (second of high-voltage capacitance 203 power on), and first role chip does not work, second role chip work
Make；When input switch 201 switchs primary (203 third time of high-voltage capacitance powers on), first role chip and second role core again
Piece all works.According to the first logical order and the second logical order, in system shown in Fig. 2, if the first chip 206 is first
Role's chip, the second chip 207 are second role chip, the first colour temperature LED light group 210 being correspondingly arranged with the first chip 206
For white light, the second colour temperature LED light group 211 being correspondingly arranged with the second chip 207 is warm light, then when first powering on, white light is bright
It rises, warm light lights when powering on for the second time, white light and Mingguang City while lighting when powering on for the third time, to realize switching colour temperature
Function.
Further, as shown in fig. 6, the detection signal of the output of input switch detection circuit 301 is hv_on.Such as Fig. 7 institute
Show, when input switch 201 is closed, the voltage of high-voltage capacitance 203 is increased, when the first divider resistance 400 and the second divider resistance
When voltage of 401 partial pressure less than the first reference potential Ref1, the second comparator 402 exports high level, i.e., the inspection exported at this time
Survey signal hv_on is high level, when detection signal hv_on is high level, represents the closure of input switch 201, otherwise represents input
Switch 201 disconnects.
Further, if the first chip 206 is configured to first role chip, the second chip 207 is configured to second role core
Piece.As shown in figure 8, waveform 900 represent be input switch 201 state, high level represent input switch 201 closure, it is on the contrary
It disconnects.Waveform 901 is the detection signal of the output of input switch detection circuit 301, and waveform 905 and waveform 906 respectively represent the
The logical order of one role's chip and second role chip, i.e. waveform 905 are the first logical order, and waveform 906 is the second logic
Sequentially, high level represents chip operation, and low level represents chip and do not work.Its concrete operating principle are as follows:
Input switch 201 re-closes (or being closed for the first time) after disconnecting a period of time when, 204 work of the first driving source
To make, the second driving source 205 does not work, and at this moment the first colour temperature LED light group 210 is lit, and the second colour temperature LED light group is not lighted,
State at this time is defined as first state；When input switch 201 is disconnected and is re-closed within a very short time, the first driving source
204 do not work, and the work of the second driving source 205, at this moment the first colour temperature LED light group 210 is not lighted, the second colour temperature LED light group quilt
It lights, state at this time is defined as the second state；When input switch 201 is again off and is re-closed within a very short time
When, the work of the first driving source 204 and the second driving source 205 work at the same time, the first colour temperature LED light group 210 and the second colour temperature LED light
It organizes while lighting, state at this time is defined as the third state；If input switch 201 is again off and is closed, first is driven
Dynamic source 204 and the second driving source 205 return to first state again.
As shown in fig. 7, the resistance and second that the first chip 206 and the second chip 207 pass through the first configuration circuit 208 of detection
The resistance of configuration circuit 209 determines respective role, when the resistance of the first configuration circuit 208 is smaller, the configuration of the first chip 206
For first role chip, and when n times of the resistance that the resistance of the second configuration circuit 209 is the first configuration circuit 208, the second core
Piece 207 is configured to second role chip.
It further, should as shown in figure 4, when the first chip 206 or the second chip 207 are configured to first role chip
The first configuration signal sl1 that the synchronization control module 501 of first chip 206 or the second chip 207 is accessed is high level, MOS
Pipe 602 is controlled by input signal IN；When the first chip 206 or the second chip 207 are configured to second role chip, the first chip
206 or second chip 207 be configured to the first configuration signal sl1 that the synchronization control module 501 of second role chip is accessed and be
Low level, so the grid of metal-oxide-semiconductor 602 is low level, metal-oxide-semiconductor 602 is in an off state, and therefore, synchronization signal can only be by the
One role's chip controls, second role chip can not control synchronization signal.As shown in figure 8, synchronization signal and first jiao
The detection signal of color chip access is identical, and synchronization signal is that high level represents the closure of input switch 201, otherwise represents input switch
201 disconnect.
Further, status control module 503 carries out state change control according to pulse triggering signal (CTLb).
As shown in figure 8, according to waveform 905 and waveform 906, when first time input switch 201 is closed, first role chip
Work, second role chip do not work；When input switch 201 is disconnected and re-closed, first role chip does not work, and second
Role's chip operation；When input switch 201 disconnects and when re-closing, first role chip and second role chip work simultaneously
Make, so far, completes a cycle if input switch 201 continues to disconnect and re-close and return to first state.
Above embodiments only technical concepts and features to illustrate the invention, its object is to allow person skilled in the art
Scholar can understand the contents of the present invention and implement accordingly, can not limit the scope of the invention.It is all to be wanted with right of the present invention
The equivalent changes and modifications that range is done are sought, should belong to the covering scope of the claims in the present invention.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (14)
1. a kind of LED drive chip characterized by comprising
Input switch detection circuit, the input switch detection circuit detect input switch according to the power-up state of energization pins
State, and export detection signal；
Logic control circuit, the logic control circuit connect with the input switch detection circuit, receive and according to the inspection
It surveys signal and exports enable signal according to scheduled logical order；
Constant-current control circuit, the constant-current control circuit connect with the logic control circuit, receive and according to the enabled letter
Number output drive signal, to control the working condition of coupled LED；And
Role's configuration pin of role's configuration is carried out to the LED drive chip according to exterior arrangement circuit；
The scheduled logical order includes the first logical order and the second logical order, and the LED drive chip is configured to
When first role chip, the logic control circuit exports the enable signal according to first logical order；The LED drives
When dynamic chip is configured to second role chip, the logic control circuit exports the enabled letter according to second logical order
Number.
2. LED drive chip according to claim 1, which is characterized in that further include: for sending or receiving synchronization signal
Synchronously control pin, and make defeated by the first role chip and second role chip synchronization of the synchronously control pin interconnection
The enable signal out, with the synchronous LED for driving the first role chip and second role chip respectively to connect.
3. LED drive chip according to claim 2, which is characterized in that the logic control circuit includes:
Role's configuration module, for being carried out according to the identification signal in role's configuration pin from the exterior arrangement circuit
Role's identification, with the first configuration signal, the second the configuration signal, Yi Jiyong according to recognition result output for control logic sequence
Signal is configured in the third for the over-voltage protection point for setting the constant-current control circuit；
Synchronization control module is connect, for matching confidence according to the detection signal and described first with role's configuration module
Number generate and export for state change pulse triggering signal；
Status control module is connect, for according to the arteries and veins respectively with role's configuration module and the synchronization control module
Trigger signal, the first configuration signal and the second configuration signal are rushed, with the first logical order or the second logical order
Export the enable signal.
4. LED drive chip according to claim 3, which is characterized in that role's configuration module includes:
It connect with role's configuration pin, match for generating the first of the first configuration signal and the second configuration signal
Confidence number and the second configuration signal generating circuit；
It connect with role's configuration pin, configure signal generating circuit for generating the third of the third configuration signal.
5. LED drive chip according to claim 4, which is characterized in that the first configuration signal and second matches confidence
Number generation circuit includes: current source, first comparator, the first NOT gate and the second NOT gate；The third configures signal generating circuit
It include: the adjusting circuit that output has identical over-voltage protection point under different role's configurations；
The output end of the current source connects role's configuration pin, and the anode of the first comparator connects the role and matches
Pin is set, the cathode of the first comparator connects the second reference potential, and the output stage of the first comparator is sequentially connected institute
State the first NOT gate and second NOT gate；Wherein, the first NOT gate output the first configuration signal, second NOT gate are defeated
The second configuration signal out；
The adjusting circuit connection is in role's configuration pin.
6. LED drive chip according to claim 3, which is characterized in that the synchronization control module includes: pull-up current
Source, signal processing circuit, pull-down circuit and output circuit；
The signal processing circuit is separately connected the input switch detection circuit, role's configuration module and the drop-down
The control terminal of circuit, the first end of the pull-down circuit connect the output end of the synchronously control pin, the pull-up current source
And the input terminal of the output circuit, the second end ground connection of the pull-down circuit, the output end of the output circuit connect institute
State status control module.
7. LED drive chip according to claim 6, which is characterized in that the signal processing circuit include: first with it is non-
Door and the 4th NOT gate, the pull-down circuit includes: metal-oxide-semiconductor, and the output circuit includes: third NOT gate；
The first input end connection input switch detection circuit of first NAND gate is described to access the detection signal
Second input terminal of the first NAND gate connects role's configuration module to access the first configuration signal, described first with it is non-
The output end of door connects the input terminal of the 4th NOT gate；The output end of 4th NOT gate connects the grid of the metal-oxide-semiconductor, institute
The source electrode ground connection of metal-oxide-semiconductor is stated, the drain electrode of the metal-oxide-semiconductor connects the synchronously control pin；
The input terminal of the third NOT gate connects the synchronously control pin, and the output end of the third NOT gate connects the state
Control module；
The grid of the metal-oxide-semiconductor is the control terminal of the pull-down circuit, and the source electrode of the metal-oxide-semiconductor is the second of the pull-down circuit
End, the drain electrode of the metal-oxide-semiconductor are the first end of the pull-down circuit.
8. LED drive chip according to claim 3, which is characterized in that the status control module includes: that pulse generates
Circuit, state storage unit and decoding circuit；
The pulse-generating circuit is connect, to receive the pulse triggering signal and export pulse letter with the synchronization control module
Number；
The state storage unit is connect, to receive the pulse signal and status signal, and root with the pulse-generating circuit
According to status signal described in the output of pulse signal；
The decoding circuit connect with the state storage unit and role's configuration module, with receive the status signal and
The first configuration signal and the second configuration signal, and according to the first configuration signal and the second configuration signal to the state
Signal is decoded, to export the enable signal.
9. LED drive chip according to claim 1 or 2, which is characterized in that the input switch detection circuit includes:
Bleeder circuit and the second comparator；
The input terminal of the bleeder circuit connects the energization pins, and the output end connection described second of the bleeder circuit is compared
The anode of device, the cathode of second comparator connect the first reference potential, described in the output stage output of second comparator
Detect signal.
10. a kind of LED drive system characterized by comprising at least two such as described in any item LED of claim 1-9 drive
Dynamic chip；
The colour temperature LED that at least two LED drive chip is respectively used to driving and is respectively correspondingly connected with, and described at least two
LED drive chip is connected by synchronously control pin.
11. LED drive system according to claim 10, which is characterized in that at least two LED drive chips packet
It includes: the first chip and the second chip；Further include: the first configuration circuit, the first driving circuit, the second configuration circuit and the second driving
Circuit；
Role's configuration pin of first chip is grounded by the first configuration circuit, and the driving signal of first chip is defeated
Pin is connect with first driving circuit out, the colour temperature LED that first driving circuit and first chip are correspondingly arranged
Connection；
Role's configuration pin of second chip is grounded by the second configuration circuit, and the driving signal of second chip is defeated
Pin is connect with second driving circuit out, the colour temperature LED that second driving circuit and second chip are correspondingly arranged
Connection；
When first chip and the second chip are identified as first role chip, second role chip, the first role
Chip detect to input switch state and synchronizes control to the second role chip by the synchronously control pin
System.
12. LED drive system according to claim 11, which is characterized in that further include: rectification circuit and high-voltage capacitance；
The input terminal of the rectification circuit is connect with input switch, and the of the output end of the rectification circuit and the high-voltage capacitance
One end connection, the second end ground connection of the high-voltage capacitance；The power supply of the energization pins of first chip and second chip
Pin connects the first end of the high-voltage capacitance.
13. LED drive system according to claim 11, which is characterized in that the resistance value of first configuration circuit and institute
The resistance value for stating the second configuration circuit is different.
14. LED drive system according to claim 11, which is characterized in that the resistance value of first configuration circuit and institute
State the second configuration circuit resistance value ratio be n, wherein n=2,3,4 ..., 8.
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