CN106535418A - LED drive chip and drive circuit - Google Patents
LED drive chip and drive circuit Download PDFInfo
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- CN106535418A CN106535418A CN201611246059.4A CN201611246059A CN106535418A CN 106535418 A CN106535418 A CN 106535418A CN 201611246059 A CN201611246059 A CN 201611246059A CN 106535418 A CN106535418 A CN 106535418A
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention provides an LED drive chip and a drive circuit, and relates to the technical field of LED illumination. The LED drive chip comprises an RS trigger, a protection module, a function module and a signal processing module, wherein the protection module, the function module and the signal processing module all are electrically connected with the RS trigger; and the LED drive chip supports power factor correction and has complete protection functions which include an under-voltage protection function, an output overvoltage protection function, an output short-circuit protection function, a current-limiting protection function and an over-temperature protection function. The LED drive circuit comprises a rectifier circuit, a filter circuit, a control circuit and a charge and discharge circuit, wherein the rectifier circuit, the filter circuit, the control circuit and the charge and discharge circuit are electrically connected in sequence; the control circuit comprises the LED drive chip. The LED drive chip has outstanding advantages of high PFC, high-precision constant current and stable voltage, low power consumption, low cost and the like, and a peripheral application circuit is simple.
Description
Technical field
The present invention relates to technical field of LED illumination, in particular to a kind of LED drive chip and drive circuit.
Background technology
At present, LED (Light Emitting Diode, light emitting diode) illuminations apply quite varied, and for example LED is penetrated
The lightings such as lamp, Down lamp, street lamp, Tunnel Lamp, compared with common incandescent lamp, fluorescent lamp etc., with small volume, power consumption
It is low, long service life, rich color, environmental protection and with premium properties such as good shock resistances.But, LED illumination power management
And its drive circuit is unsatisfactory, there are some shortcomings, such as PFC (Power Factor Correction, power factor) compared with
Low, power consumption is larger, constant-current voltage-stabilizing precision is more low, have impact on the reliability and service life of LED illumination.
The content of the invention
It is an object of the invention to provide a kind of LED drive chip, to improve the problems referred to above.
Another object of the present invention is to a kind of LED drive circuit is provided, to improve the problems referred to above.
To achieve these goals, the technical scheme that the embodiment of the present invention is adopted is as follows：
The present invention provides a kind of LED drive chip, and which includes that VCC pin, ZCD pins, RT pins, Ctrl pins, FB draw
Pin, Gate pins, GND pin and CS pins, and be arranged inside LED drive chip rest-set flip-flop, protection module, function
Module and signal processing module, protection module, functional module and signal processing module are electrically connected with rest-set flip-flop, rest-set flip-flop
Including R input, S inputs and Q output；The S inputs of VCC pin, protection module and rest-set flip-flop are sequentially connected electrically,
The S inputs of ZCD pins, protection module and rest-set flip-flop are sequentially connected electrically, RT pins, signal processing module and rest-set flip-flop
R input is sequentially connected electrically, and the R input of Ctrl pins, signal processing module and rest-set flip-flop is sequentially connected electrically, FB pins,
The R input of signal processing module and rest-set flip-flop is sequentially connected electrically, the Q output of rest-set flip-flop, functional module, protection module
It is sequentially connected electrically with CS pins, the Q output of rest-set flip-flop, functional module and Gate pins are sequentially connected electrically.
Further, the protection module includes：Under-voltage protective module, overvoltage protective module, short circuit protection module and limit
Stream protection module；The S inputs of the VCC pin, under-voltage protective module and rest-set flip-flop are sequentially connected electrically, the VCC pin,
The S inputs of overvoltage protective module and rest-set flip-flop are sequentially connected electrically；The ZCD pins, overvoltage protective module and rest-set flip-flop
S inputs be sequentially connected electrically, the S inputs of the ZCD pins, short circuit protection module and rest-set flip-flop are sequentially connected electrically；Institute
Q output, functional module, current-limiting protection module and the CS pins for stating rest-set flip-flop is sequentially connected electrically.
Further, the under-voltage protective module includes VCC under-voltage protective modules, the VCC pin, VCC under-voltage protections
The S inputs of module and rest-set flip-flop are sequentially connected electrically；The overvoltage protective module include VCC clampers and overvoltage protective module and
Output over-voltage protection module, the S inputs of the VCC pin, VCC clampers and overvoltage protective module and rest-set flip-flop are electrically connected successively
Connect, the S inputs of the ZCD pins, output over-voltage protection module and rest-set flip-flop are sequentially connected electrically；The short circuit protection module
Including clamper and zero passage detection module, the S inputs of the ZCD pins, clamper and zero passage detection module and rest-set flip-flop are successively
Electrical connection；The current-limiting protection module includes Cycle by Cycle current-limiting protection module, the Q output of the rest-set flip-flop, functional module,
Cycle by Cycle current-limiting protection module and CS pins are sequentially connected electrically.
Further, the protection module also includes overheat protector module, the overheat protector module and RS triggerings
The S inputs electrical connection of device.
Further, the functional module includes：Base modules, logic module and drive module, the VCC pin, VCC
Under-voltage protective module and base modules are sequentially connected electrically；The Q output of the rest-set flip-flop, logic module, drive module and
Gate pins are sequentially connected electrically, and the logic module, Cycle by Cycle current-limiting protection module and CS pins are sequentially connected electrically.
Further, the signal processing module includes saw-toothed wave generator, comparator and amplifier, the RT pins, saw
The R input of tooth wave producer, comparator and rest-set flip-flop is sequentially connected electrically, the FB pins, amplifier, comparator and RS triggering
The R input of device is sequentially connected electrically.
Further, the in-phase input end of the RT pins, saw-toothed wave generator and comparator is sequentially connected electrically, the ratio
Electrically connect with the R input of rest-set flip-flop compared with the output end of device, the FB pins are electrically connected with the negative input end of the amplifier, institute
State Ctrl pins to electrically connect with the output end of the inverting input and the amplifier of the comparator respectively.
Present invention also offers a kind of LED drive circuit, which includes control circuit, and control circuit includes that above-mentioned LED drives
Dynamic chip, the LED drive circuit also include rectification circuit, filter circuit and charge-discharge circuit, rectification circuit, filter circuit, control
Circuit processed and charge-discharge circuit are sequentially connected electrically.
Further, the control circuit also includes power tube and current sense resistor, the drain electrode of the power tube and institute
Rectification circuit electrical connection is stated, the source electrode of the power tube is electrically connected with the Gate pins of the LED drive chip, the power tube
Gate series described in current sense resistor ground connection, the current sense resistor driven with the filter circuit and the LED respectively
The CS pins electrical connection of dynamic chip.
Further, the charge-discharge circuit includes transformer, fly-wheel diode and load LED, the master of the transformer
While electrically connecting with the ZCD pins of the LED drive chip, the secondary of the transformer is electrically connected with the anode of the fly-wheel diode
Connect, the negative electrode of the fly-wheel diode is electrically connected with the load LED.
Hinge structure, the invention has the advantages that：A kind of LED drive chip that the present invention is provided, in which
Portion's structure includes rest-set flip-flop and the protection module, functional module and the signal processing module that electrically connect with rest-set flip-flop, and LED drives
Dynamic chip supports PFC, with complete defencive function, including under-voltage protection, output over-voltage protection, output short-circuit
Protection, current-limiting protection and overheat protector function.
The present invention also provides a kind of LED drive circuit, and which includes rectification circuit, filter circuit, control circuit and discharge and recharge
Circuit, rectification circuit, filter circuit, control circuit and charge-discharge circuit are sequentially connected electrically, and control circuit includes offer of the present invention
LED drive chip, there is provided a kind of high reliability, the long-life, good Electro Magnetic Compatibility, environmental protection and energy saving, low cost LED shine
Bright power solution, with high PFC, high precision constant current voltage stabilizing, low-power consumption, peripheral applications circuit is simple, and low cost etc. is prominent
Advantage.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Description of the drawings
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by to be used attached needed for embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, thus be not construed as it is right
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can be with according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 shows the internal structure block diagram of the LED drive chip that first embodiment of the invention is provided.
Fig. 2 shows the internal structure block diagram of the LED drive chip that first embodiment of the invention is provided.
Fig. 3 shows the internal structure block diagram of the LED drive chip that first embodiment of the invention is provided.
Fig. 4 shows the circuit theory diagrams of the LED drive circuit that second embodiment of the invention is provided.
Icon：100-LED driving chips；110-RS triggers；130- protection modules；131- under-voltage protective modules；1311-
VCC under-voltage protective modules；133- overvoltage protective modules；1331-VCC clampers and overvoltage protective module；1333- output over-voltage protections
Module；135- short circuit protection modules；1351- clampers and zero passage detection module；137- current-limiting protection modules；1371- Cycle by Cycle is limited
Stream protection module；139- overheat protector modules；150- functional modules；151- base modules；153- logic modules；155- drives mould
Block；170- signal processing modules；171- saw-toothed wave generators；173- comparators；175- amplifiers；200-LED drive circuits；210-
Rectification circuit；211- rectifier bridges；230- filter circuits；250- control circuits；270- charge-discharge circuits；271- loads LED.
Specific embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground description, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.Generally exist
The component of the embodiment of the present invention described and illustrated in accompanying drawing can be arranged and be designed with a variety of configurations herein.Cause
This, the detailed description of the embodiments of the invention to providing in the accompanying drawings is not intended to limit claimed invention below
Scope, but it is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not doing
The every other embodiment obtained on the premise of going out creative work, belongs to the scope of protection of the invention.
It should be noted that：Similar label and letter represent similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then in subsequent accompanying drawing which further need not be defined and is explained.Meanwhile, the present invention's
In description, term " first ", " second " etc. are only used for distinguishing description, and it is not intended that indicating or implying relative importance.
First embodiment
Refer to Fig. 1, the LED drive chip 100 that first embodiment of the invention is provided, it include VCC pin, ZCD pins,
RT pins, Ctrl pins, FB pins, Gate pins, GND pin and CS pins, and be arranged inside LED drive chip 100
Rest-set flip-flop 110, protection module 130, functional module 150 and signal processing module 170, protection module 130, functional module
150 and signal processing module 170 electrically connect with rest-set flip-flop 110, and protection module 130 and functional module 150 are electrically connected；
VCC pin, ZCD pins and CS pins are electrically connected with protection module 130, RT pins, Ctrl pins, FB pins and Gate pins
Electrically connect with signal processing module 170, GND pin ground connection.
Fig. 2 is refer to, rest-set flip-flop 110 includes R input, S inputs and Q output, for storing LED drive chip
100 working condition.
Protection module 130 includes that under-voltage protective module 131, overvoltage protective module 133, short circuit protection module 135, current limliting are protected
Shield module 137 and overheat protector module 139, the S inputs of VCC pin, under-voltage protective module 131 and rest-set flip-flop 110 are successively
Electrically connect, and the S inputs of VCC pin, overvoltage protective module 133 and rest-set flip-flop 110 are sequentially connected electrically；ZCD pins, overvoltage
The S inputs of protection module 133 and rest-set flip-flop 110 are sequentially connected electrically, and ZCD pins, short circuit protection module 135 and RS triggering
The S inputs of device 110 are sequentially connected electrically；The Q output of rest-set flip-flop 110, functional module 150, current-limiting protection module 137 and CS
Pin is sequentially connected electrically.
Under-voltage protective module 131 for when the input voltage of VCC pin is reduced to critical voltage, disconnect input voltage with
The electrical connection of rest-set flip-flop 110 and functional module 150, prevents LED drive chip 100 because overload is burnt.
In the present embodiment, Fig. 3 is refer to, under-voltage protective module 131 is preferably VCC under-voltage protective modules 1311, and VCC draws
The S inputs of pin, VCC under-voltage protective modules 1311 and rest-set flip-flop 110 are sequentially connected electrically, and VCC under-voltage protective modules 1311
Electrically connect with functional module 150.
The output voltage that overvoltage protective module 133 is used for input voltage or ZCD pins when VCC pin is high more than predetermined
Maximum when, the connection of deenergization and LED drive chip 100 or make LED drive chip 100 controlled plant voltage
Reduce.
In the present embodiment, overvoltage protective module 133 includes that VCC clampers and overvoltage protective module 1331 and output overvoltage are protected
Shield module 1333, the S inputs of VCC pin, VCC clampers and overvoltage protective module 1331 and rest-set flip-flop 110 are sequentially connected electrically,
The S inputs of ZCD pins, output over-voltage protection module 1333 and rest-set flip-flop 110 are sequentially connected electrically, and VCC clampers and overvoltage are protected
Shield module 1331 for when the input voltage of VCC pin exceedes predetermined maximum, deenergization and LED drive chip 100
Connection, output over-voltage protection module 1333 for when ZCD pins output voltage exceed predetermined maximum when, be connected to
The voltage of the controlled plant of ZCD pins is reduced.
Short circuit protection module 135 is for when being short-circuited in circuit, disconnection ZCD pins are electrically connected with rest-set flip-flop 110
Connect, prevent from burning out LED drive chip 100.
In the present embodiment, short circuit protection module 135 is preferably clamper and zero passage detection module 1351, ZCD pins, clamper
And the S inputs of zero passage detection module 1351 and rest-set flip-flop 110 are sequentially connected electrically.
Current-limiting protection module 137 for limiting to the maximum current that LED drive chip 100 is exported, with guarantee battery,
The electric current of load etc. is in allowed limits, it is to avoid electric current is excessive, and electrical part is caused damage.
In the present embodiment, current-limiting protection module 137 is preferably Cycle by Cycle current-limiting protection module 1371, rest-set flip-flop 110
Q output, functional module 150, Cycle by Cycle current-limiting protection module 1371 and CS pins be sequentially connected electrically.
Overheat protector module 139 is used to exceed the maximum temperature for being allowed when the operating temperature of LED drive chip 100
When, sending excess temperature signal makes LED drive chip 100 quit work, and no longer produces power consumption, so as to temperature drop.
Functional module 150 includes base modules 151, logic module 153 and drive module 155, VCC pin, VCC are under-voltage guarantor
Shield module 1311 and base modules 151 are sequentially connected electrically, and base modules 151 are electrically connected with the S inputs of rest-set flip-flop 110；
The Q output of rest-set flip-flop 110, logic module 153 and drive module 155 are sequentially connected electrically, and logic module 153, Cycle by Cycle
Current-limiting protection module 1371 and CS pins are sequentially connected electrically.
Base modules 151 are used to provide a normal voltage, judge that with this output voltage of LED drive chip 100 is
It is too high or too low, and finally regulation output voltage is consistent with the normal voltage of base modules 151, keeps output voltage stabilization.
In the present embodiment, the normal voltage that base modules 151 are provided is preferably 0.25V.
Logic module 153 is used for the logic function for realizing LED drive chip 100.
Drive module 155 is made so as to meet load rating power for the power of LED drive chip 100 is amplified
Must load can be with normal work.
Signal processing module 170 includes saw-toothed wave generator 171, comparator 173 and amplifier 175, and RT pins, sawtooth waveforms are sent out
The R input of raw device 171, comparator 173 and rest-set flip-flop 110 is sequentially connected electrically, Ctrl pins, comparator 173 and RS triggering
The R input of device 110 is sequentially connected electrically, and the R input of FB pins, amplifier 175, comparator 173 and rest-set flip-flop 110 is electric successively
Connection.
In the present embodiment, RT pins, saw-toothed wave generator 171, the in-phase input end of comparator 173 are sequentially connected electrically,
The output end of comparator 173 is electrically connected with the R input of rest-set flip-flop 110；FB pins are electrically connected with the negative input end of amplifier 175
Connect, Ctrl pins are electrically connected with the output end of the inverting input and amplifier 175 of comparator 173 respectively, the positive input of amplifier 175
End is electrically connected with 0.25V input voltages.The feedback signal of FB pins after amplifier 175 is amplified in the same direction, input comparator
173 inverting input, the in-phase input end of the sawtooth waveforms input comparator 173 that saw-toothed wave generator 171 is produced.If anti-phase defeated
Enter the voltage of the voltage more than in-phase input end at end, then the output end output low level of comparator 173, if the electricity of in-phase input end
Pressure is more than the voltage of inverting input, then the output end output high level of comparator 173.
In the present embodiment, LED drive chip 100 has advantages below：
(1) wide input voltage range：80～300V；
(2) electric current constant current accuracy is high：± 3%, constant current output electric current：20mA～1000mA,
(3) high conversion efficiency：Better than 85%；
(4) high PFC：0.92；
(5) PWM non-pole light regulatings are received；
(6) operating temperature：-40℃—+85℃；With safety protection functions such as excess temperature, overvoltage, under-voltage, short-circuit and open circuits；
(7) CE, UL certification is supported in the driving of chip solution.
The operation principle of the LED drive chip 100 provided by first embodiment of the invention is：Inside LED drive chip 100
The under-voltage protective module 131 that electrically connects with rest-set flip-flop 110 including rest-set flip-flop 110 and, overvoltage protective module 133, short circuit
Protection module 135, current-limiting protection module 137 and overheat protector module 139, also include signal transacting inside LED drive chip 100
Module 170, signal processing module 170 are electrically connected with rest-set flip-flop 110, and LED drive chip 100 supports PFC, tool
There are complete defencive function, including under-voltage protection, output over-voltage protection, output short circuit protection, current-limiting protection and overheat protector work(
Energy.
Second embodiment
Refer to Fig. 4, the LED drive circuit 200 that second embodiment of the invention is provided, which includes rectification circuit 210, filtering
Circuit 230, control circuit 250 and charge-discharge circuit 270, rectification circuit 210, filter circuit 230, control circuit 250 and charge and discharge
Circuit 270 is sequentially connected electrically, and control circuit 250 includes the LED drive chip 100 provided by first embodiment of the invention.
Rectification circuit 210 for by outside convert alternating current into direct current, it include AC power F1, rectifier bridge 211,
First electric capacity C1 and the first diode D1, AC power F1 are electrically connected with the input of rectifier bridge 211, and the first of rectifier bridge 211
Output end is connected the first electric capacity C1 ground connection, and electrically connects with control circuit 250, and the second output end of rectifier bridge 211 is in the one or two
The anode electrical connection of pole pipe D1, the negative electrode of the first diode D1 are electrically connected with filter circuit 230.
230 one end of filter circuit is electrically connected with the negative electrode of the first diode D1, and the other end is electrically connected with control circuit 250,
In the present embodiment, filter circuit 230 is preferably the RC filter circuits being made up of first resistor R1 and the second electric capacity C2.
Control circuit 250 includes the LED drive chip 100 provided by first embodiment of the invention, and power tube Q1 and
Current sense resistor R2, FB pin serial connection first resistors R1 of LED drive chip 100 connect the negative electrode of the first diode D1, and go here and there
Join the second electric capacity C2 ground connection.The ZCD pins of LED drive chip 100 are electrically connected with charge-discharge circuit 270.The drain electrode of power tube Q1
The first output end of rectifier bridge 211 is electrically connected to, the source electrode of power tube Q1 is electrically connected with the Gate pins of LED drive chip 100,
The gate series current sense resistor R2 ground connection of power tube Q1, the ungrounded end of current sense resistor R2 are electrically connected to LED drivings
The CS pins of chip 100, and electrically connect with the negative electrode of the first diode D1.
Charge-discharge circuit 270 includes transformer T1, sustained diode 3, the 3rd electric capacity C3 and load LED271, transformer
The main side of T1 is electrically connected with the ZCD pins of LED drive chip 100, and the secondary of transformer T1 is electric with the anode of sustained diode 3
Connection, the negative electrode of sustained diode 3 are electrically connected with load LED271, and the 3rd electric capacity C3 is connected in parallel on the two ends of load LED271.
The operation principle of the LED drive circuit 200 provided by second embodiment of the invention is：
(1) power tube Q1 conductings, AC power F1 are transformed to dc source through rectification circuit 210, and dc source passes through
Power tube Q1, is applied to voltage on current sense resistor R2, transformer T1 and load LED271 so that the electric current of transformer T1
Rise, until it reaches the time ton of 100 internal control of LED drive chip, now the main side peak point current of transformer T1 is assumed to
Ipp, power tube Q1 are turned off；
(2) power tube Q1 shut-offs, as the main side of transformer T1 does not have discharge path, therefore the electric current of transformer T1 by pair
While 3 couples of the 3rd electric capacity C3 of sustained diode and load LED271 electric discharges are flowed through, until the electric current of transformer T1 is dropped from peak I pp
To zero, the ZCD pin voltage zero passages of subsequent LED drive chip 100, then power tube Q1 conductings；
(3) assume that transformer T1 energy is transmitted without loss, then peak point current Ipp is obtained during power tube Q1 conductings,
During power tube Q1 is turned off, energy is transmitted to load LED271, then the average current for loading LED271 is sustained diode 3
Average current；Peak point current Ipp flows through current sense resistor R2 simultaneously, FB of the control source for obtaining to LED drive chip 100
Pin, is compared output Ctrl pin voltages afterwards by amplifier 175, and then controls the conducting of power tube Q1 with reference voltage 0.25V
Time ton, so as to reach the control of output current loop.
In sum, a kind of LED drive chip that first embodiment of the invention is provided, its internal structure include rest-set flip-flop
Under-voltage protective module, overvoltage protective module, short circuit protection module, current-limiting protection module and the mistake for electrically connecting with rest-set flip-flop
Warm protection module, also includes signal processing module inside LED drive chip, signal processing module is electrically connected with rest-set flip-flop, LED
Driving chip supports PFC, with complete defencive function, including under-voltage protection, output over-voltage protection, exports short
Road protection, current-limiting protection and overheat protector function.
A kind of LED drive circuit that second embodiment of the invention is provided, which includes rectification circuit, filter circuit, control electricity
Road and charge-discharge circuit, rectification circuit, filter circuit, control circuit and charge-discharge circuit are sequentially connected electrically, and control circuit includes
The LED drive chip provided by first embodiment of the invention, there is provided a kind of high reliability, long-life, Electro Magnetic Compatibility be good,
Environmental protection and energy saving, the LED illumination power solution of low cost, with high PFC, high precision constant current voltage stabilizing, low-power consumption, peripheral applications
Circuit is simple, the outstanding advantages such as low cost.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation are made a distinction with another entity or operation, and are not necessarily required or implied these entities or deposit between operating
In any this actual relation or order.And, term " including ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that a series of process, method, article or equipment including key elements not only will including those
Element, but also including other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element for being limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.It should be noted that：Similar label and letter exist
Similar terms is represented in figure below, therefore, once being defined in a certain Xiang Yi accompanying drawing, then it is not required in subsequent accompanying drawing
Which is further defined and is explained.
Claims (10)
1. a kind of LED drive chip, it is characterised in that the LED drive chip includes：VCC pin, ZCD pins, RT pins,
Ctrl pins, FB pins, Gate pins, GND pin and CS pins, and the RS being arranged inside the LED drive chip touch
Send out device, protection module, functional module and signal processing module, the protection module, functional module and signal processing module with
The rest-set flip-flop electrical connection, the rest-set flip-flop include R input, S inputs and Q output；
The S inputs of the VCC pin, protection module and rest-set flip-flop are sequentially connected electrically, the ZCD pins, protection module and
The S inputs of rest-set flip-flop are sequentially connected electrically, and the R input of the RT pins, signal processing module and rest-set flip-flop is electric successively
Connection, the R input of the Ctrl pins, signal processing module and rest-set flip-flop is sequentially connected electrically, at the FB pins, signal
Reason module and the R input of rest-set flip-flop are sequentially connected electrically, the Q output of the rest-set flip-flop, functional module, protection module and
CS pins are sequentially connected electrically, and the Q output of the rest-set flip-flop, functional module and Gate pins are sequentially connected electrically.
2. LED drive chip as claimed in claim 1, it is characterised in that the protection module includes：Under-voltage protective module,
Overvoltage protective module, short circuit protection module and current-limiting protection module；
The S inputs of the VCC pin, under-voltage protective module and rest-set flip-flop are sequentially connected electrically, and the VCC pin, overvoltage are protected
The S inputs of shield module and rest-set flip-flop are sequentially connected electrically；
The S inputs of the ZCD pins, overvoltage protective module and rest-set flip-flop are sequentially connected electrically, and the ZCD pins, short circuit are protected
The S inputs of shield module and rest-set flip-flop are sequentially connected electrically；
The Q output of the rest-set flip-flop, functional module, current-limiting protection module and CS pins are sequentially connected electrically.
3. LED drive chip as claimed in claim 2, it is characterised in that the under-voltage protective module includes VCC under-voltage protections
Module, the S inputs of the VCC pin, VCC under-voltage protective modules and rest-set flip-flop are sequentially connected electrically；
The overvoltage protective module includes VCC clampers and overvoltage protective module and output over-voltage protection module, the VCC pin,
The S inputs of VCC clampers and overvoltage protective module and rest-set flip-flop are sequentially connected electrically, the ZCD pins, output over-voltage protection mould
The S inputs of block and rest-set flip-flop are sequentially connected electrically；
The short circuit protection module includes clamper and zero passage detection module, the ZCD pins, clamper and zero passage detection module and RS
The S inputs of trigger are sequentially connected electrically；
The current-limiting protection module includes Cycle by Cycle current-limiting protection module, the Q output of the rest-set flip-flop, functional module, by
Cycle-by-cycle current limiting protection module and CS pins are sequentially connected electrically.
4. LED drive chip as claimed in claim 2, it is characterised in that the protection module also includes overheat protector module,
The S inputs electrical connection of the overheat protector module and the rest-set flip-flop.
5. LED drive chip as claimed in claim 1, it is characterised in that the functional module includes：Base modules, logic
Module and drive module, the VCC pin, VCC under-voltage protective modules and base modules are sequentially connected electrically；
The Q output of the rest-set flip-flop, logic module, drive module and Gate pins are sequentially connected electrically, and the logic mould
Block, Cycle by Cycle current-limiting protection module and CS pins are sequentially connected electrically.
6. LED drive chip as claimed in claim 1, it is characterised in that the signal processing module includes that sawtooth waveforms occurs
Device, comparator and amplifier, the R input of the RT pins, saw-toothed wave generator, comparator and rest-set flip-flop are sequentially connected electrically,
The R input of the FB pins, amplifier, comparator and rest-set flip-flop is sequentially connected electrically.
7. LED drive chip as claimed in claim 6, it is characterised in that the RT pins, saw-toothed wave generator and comparator
In-phase input end be sequentially connected electrically, the output end of the comparator is electrically connected with the R input of rest-set flip-flop, the FB pins
Electrically connect with the negative input end of the amplifier, Ctrl pins inverting input and the amplifier respectively with the comparator
Output end electrical connection.
8. a kind of LED drive circuit, including control circuit, the control circuit include the LED described in any one of claim 1-7
Driving chip, it is characterised in that the LED drive circuit also includes rectification circuit, filter circuit and charge-discharge circuit, described whole
Current circuit, filter circuit, control circuit and charge-discharge circuit are sequentially connected electrically.
9. LED drive circuit as claimed in claim 8, it is characterised in that the control circuit also includes power tube and electric current
Detection resistance, the drain electrode of the power tube are electrically connected with the rectification circuit, and the source electrode of the power tube drives core with the LED
The Gate pins electrical connection of piece, current sense resistor ground connection, the current sense resistor described in the gate series of the power tube
Electrically connect with the CS pins of the filter circuit and the LED drive chip respectively.
10. LED drive circuit as claimed in claim 9, it is characterised in that the charge-discharge circuit includes transformer, afterflow
Diode and load LED, the main side of the transformer are electrically connected with the ZCD pins of the LED drive chip, the transformer
Secondary is electrically connected with the anode of the fly-wheel diode, and the negative electrode of the fly-wheel diode is electrically connected with the load LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611246059.4A CN106535418A (en) | 2016-12-29 | 2016-12-29 | LED drive chip and drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611246059.4A CN106535418A (en) | 2016-12-29 | 2016-12-29 | LED drive chip and drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106535418A true CN106535418A (en) | 2017-03-22 |
Family
ID=58338473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611246059.4A Pending CN106535418A (en) | 2016-12-29 | 2016-12-29 | LED drive chip and drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106535418A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107734782A (en) * | 2017-11-17 | 2018-02-23 | 上海阿卡得电子有限公司 | A kind of new power control output circuit |
| CN108495416A (en) * | 2018-04-19 | 2018-09-04 | 中山市欧帝尔电器照明有限公司 | LED constant current driving temperature protects chip and LED light |
| CN113036721A (en) * | 2021-03-04 | 2021-06-25 | 杰华特微电子（杭州）有限公司 | Overvoltage protection method and protection circuit of booster circuit and booster circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203279284U (en) * | 2013-05-20 | 2013-11-06 | 贵州恩纬西光电科技发展有限公司 | LED lighting power supply drive chip |
| CN206341455U (en) * | 2016-12-29 | 2017-07-18 | 重庆奥海辉龙大数据有限公司 | LED drive chip and drive circuit |
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2016
- 2016-12-29 CN CN201611246059.4A patent/CN106535418A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203279284U (en) * | 2013-05-20 | 2013-11-06 | 贵州恩纬西光电科技发展有限公司 | LED lighting power supply drive chip |
| CN206341455U (en) * | 2016-12-29 | 2017-07-18 | 重庆奥海辉龙大数据有限公司 | LED drive chip and drive circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107734782A (en) * | 2017-11-17 | 2018-02-23 | 上海阿卡得电子有限公司 | A kind of new power control output circuit |
| CN108495416A (en) * | 2018-04-19 | 2018-09-04 | 中山市欧帝尔电器照明有限公司 | LED constant current driving temperature protects chip and LED light |
| CN108495416B (en) * | 2018-04-19 | 2024-04-23 | 中山市欧帝尔电器照明有限公司 | LED constant-current driving temperature protection chip and LED lamp |
| CN113036721A (en) * | 2021-03-04 | 2021-06-25 | 杰华特微电子（杭州）有限公司 | Overvoltage protection method and protection circuit of booster circuit and booster circuit |
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Application publication date: 20170322 |