CN206341455U - LED drive chip and drive circuit - Google Patents
LED drive chip and drive circuit Download PDFInfo
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- CN206341455U CN206341455U CN201621471711.8U CN201621471711U CN206341455U CN 206341455 U CN206341455 U CN 206341455U CN 201621471711 U CN201621471711 U CN 201621471711U CN 206341455 U CN206341455 U CN 206341455U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model provides a kind of LED drive chip and drive circuit, is related to technical field of LED illumination.The LED drive chip includes rest-set flip-flop and the protection module, functional module and the signal processing module that are electrically connected with rest-set flip-flop; LED drive 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 LED drive circuit includes rectification circuit, filter circuit, control circuit and charge-discharge circuit, rectification circuit, filter circuit, control circuit and charge-discharge circuit are sequentially connected electrically, controlling circuit includes LED drive chip, with high PFC, high precision constant current voltage stabilizing, low-power consumption, peripheral applications circuit is simple, the outstanding advantages such as low cost.
Description
Technical field
The utility model is related 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 application is quite varied, and for example LED is penetrated
The illuminators 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 the premium properties such as good shock resistance.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.
Utility model content
The purpose of this utility model is to provide a kind of LED drive chip, to improve above mentioned problem.
Another object of the present utility model is to provide a kind of LED drive circuit, to improve above mentioned problem.
To achieve these goals, the technical scheme that the utility model embodiment is used is as follows：
The utility model provides a kind of LED drive chip, it include VCC pin, ZCD pins, RT pins, Ctrl pins,
FB pins, Gate pins, GND pin and CS pins, and be arranged at rest-set flip-flop inside LED drive chip, protection module,
Functional module and signal processing module, protection module, functional module and signal processing module are electrically connected with rest-set flip-flop, and RS is touched
Sending out device includes R input, S inputs and Q output；The S inputs of VCC pin, protection module and rest-set flip-flop are electrically connected successively
Connect, the S inputs of ZCD pins, protection module and rest-set flip-flop are sequentially connected electrically, RT pins, signal processing module and RS triggerings
The R input of device is sequentially connected electrically, and the R input of Ctrl pins, signal processing module and rest-set flip-flop is sequentially connected electrically, and FB draws
The R input of pin, signal processing module and rest-set flip-flop is sequentially connected electrically, the Q output of rest-set flip-flop, functional module, protection
Module and CS pins are sequentially connected electrically, and Q output, functional module and the Gate pins of rest-set flip-flop are sequentially connected electrically.
Further, the protection module includes：Under-voltage protective module, overvoltage protective module, short circuit protection module and limit
Flow 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 are 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
The S inputs of output over-voltage protection module, 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 triggerings
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 connected compared with the output end of device with the R input of rest-set flip-flop, the FB pins are electrically connected with the negative input end of the amplifier, institute
Ctrl pins are stated to electrically connect with the inverting input of the comparator and the output end of the amplifier respectively.
The utility model additionally provides a kind of LED drive circuit, and it includes controlling circuit, and control circuit includes above-mentioned
LED drive chip, the LED drive circuit also includes rectification circuit, filter circuit and charge-discharge circuit, rectification circuit, filtered electrical
Road, control circuit 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 be grounded, the current sense resistor drives 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
Side is electrically connected with the ZCD pins of the LED drive chip, and the anode of the secondary of the transformer and the fly-wheel diode is electrically connected
Connect, the negative electrode of the fly-wheel diode is electrically connected with the load LED.
Compared with the prior art, the utility model has the advantages that：A kind of LED driving cores that the utility model is provided
Piece, its internal structure includes rest-set flip-flop and the protection module, functional module and the signal transacting mould that are electrically connected with rest-set flip-flop
Block, LED drive 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 utility model also provides a kind of LED drive circuit, and it includes rectification circuit, filter circuit, control circuit and filled
Discharge circuit, rectification circuit, filter circuit, control circuit and charge-discharge circuit are sequentially connected electrically, and control circuit includes this practicality
The LED drive chip of new offer there is provided a kind of high reliability, the long-life, good Electro Magnetic Compatibility, environmental protection and energy saving, it is low into
This LED illumination power solution, with high PFC, high precision constant current voltage stabilizing, low-power consumption, peripheral applications circuit is simple, it is low into
This grade outstanding advantages.
To enable above-mentioned purpose of the present utility model, feature and advantage to become apparent, preferred embodiment cited below particularly, and
Coordinate appended accompanying drawing, be described in detail below.
Brief description of the drawings
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that retouched
The embodiment stated is a part of embodiment of the utility model, rather than whole embodiments.Generally here described in accompanying drawing and
The component of the utility model embodiment shown can be arranged and designed with a variety of configurations.Therefore, below to attached
The detailed description of the embodiment of the present utility model provided in figure is not intended to limit claimed scope of the present utility model,
But it is merely representative of selected embodiment of the present utility model.Based on the embodiment in the utility model, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the model of the utility model protection
Enclose.
Fig. 1 shows the internal structure block diagram for the LED drive chip that the utility model first embodiment is provided.
Fig. 2 shows the internal structure block diagram for the LED drive chip that the utility model first embodiment is provided.
Fig. 3 shows the internal structure block diagram for the LED drive chip that the utility model first embodiment is provided.
Fig. 4 shows the circuit theory diagrams for the LED drive circuit that the utility model second embodiment 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
Flow 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- controls circuit；270- charge-discharge circuits；271- loads LED.
Embodiment
Below in conjunction with accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out clear
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole realities
Apply example.The component of the utility model embodiment generally here described and illustrated in accompanying drawing can be come with a variety of configurations
Arrangement and design.Therefore, the detailed description of embodiment of the present utility model below to providing in the accompanying drawings is not intended to limit
Claimed scope of the present utility model, but it is merely representative of selected embodiment of the present utility model.Based on the utility model
Embodiment, the every other embodiment that those skilled in the art are obtained on the premise of creative work is not made, all
Belong to the scope of the utility model protection.
In description of the present utility model, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term is " even
Connect " it should be interpreted broadly, for example, it may be mechanically connecting or electrically connecting；Can be joined directly together, can also pass through
Intermediary is indirectly connected to, and can be the connection of two element internals.For the ordinary skill in the art, can have
Body situation understands concrete meaning of the above-mentioned term in the utility model.
Below in conjunction with the accompanying drawings, some embodiments of the present utility model are elaborated.In the case where not conflicting, under
Feature in the embodiment and embodiment stated can be mutually combined.
First embodiment
It refer to Fig. 1, the LED drive chip 100 that the utility model first embodiment is provided, it includes VCC pin, ZCD
Pin, RT pins, Ctrl pins, FB pins, Gate pins, GND pin and CS pins, and it is arranged at LED drive chip 100
Internal rest-set flip-flop 110, protection module 130, functional module 150 and signal processing module 170, protection module 130, function mould
Block 150 and signal processing module 170 are electrically connected 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 connected 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 under-voltage protective module 131, overvoltage protective module 133, short circuit protection module 135, current limliting and protected
Module 137 and overheat protector module 139 are protected, 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 triggerings
The S inputs of device 110 are sequentially connected electrically；Q output, functional module 150, current-limiting protection module 137 and the CS of rest-set flip-flop 110
Pin is sequentially connected electrically.
Under-voltage protective module 131 be used 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 that LED drive chip 100 from burning because of overload.
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 connected with functional module 150.
Overvoltage protective module 133 is used for when the input voltage of VCC pin or the output voltage of ZCD pins are high more than predetermined
Maximum when, the connection of deenergization and LED drive chip 100 or make LED drive chip 100 controlled plant voltage
Reduction.
In the present embodiment, overvoltage protective module 133 includes VCC clampers and overvoltage protective module 1331 and output overvoltage is protected
The S inputs of shield module 1333, 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
Protecting module 1331 is used for when the input voltage of VCC pin exceedes predetermined maximum, deenergization and LED drive chip 100
Connection, output over-voltage protection module 1333 be used for when ZCD pins output voltage exceed predetermined maximum when, be connected to
The voltage reduction of the controlled plant of ZCD pins.
Short circuit protection module 135 is used for when being short-circuited in circuit, and 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 be used for LED drive chip 100 export maximum current limit, with ensure 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 for when the operating temperature of LED drive chip 100 has exceeded the maximum temperature allowed
When, sending excess temperature signal makes LED drive chip 100 be stopped, and power consumption is no longer produced, so that temperature drop.
Functional module 150 includes base modules 151, logic module 153 and drive module 155, and VCC pin, VCC are under-voltage to be protected
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；
Q output, logic module 153 and the drive module 155 of rest-set flip-flop 110 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, and the output voltage of LED drive chip 100 is judged with this 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 used to the power of LED drive chip 100 being amplified, so that meeting load rating power makes
Must load can be with normal work.
Signal processing module 170 includes saw-toothed wave generator 171, comparator 173 and amplifier 175, RT pins, sawtooth waveforms hair
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 triggerings
The R input of device 110 is sequentially connected electrically, FB pins, amplifier 175, comparator 173 and rest-set flip-flop 110 R input it 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 and the negative input end of amplifier 175 are electrically connected
Connect, Ctrl pins are electrically connected with the inverting input of comparator 173 and the output end of amplifier 175 respectively, the positive input of amplifier 175
End is electrically connected with 0.25V input voltages.The feedback signal of FB pins is after amplifier 175 is amplified in the same direction, input comparator
173 inverting input, the in-phase input end for the sawtooth waveforms input comparator 173 that saw-toothed wave generator 171 is produced.If anti-phase defeated
The voltage for entering end is more than the voltage of in-phase input end, then the output end output low level of comparator 173, if the electricity of in-phase input end
Output end output high level of the pressure more than the voltage, then comparator 173 of inverting input.
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 are supported in the driving of chip solution.
The operation principle for the LED drive chip 100 that the utility model first embodiment is provided is：LED drive chip 100
Inside including rest-set flip-flop 110 and electrically connected with rest-set flip-flop 110 under-voltage protective module 131, overvoltage protective module 133,
Also include signal inside short circuit protection module 135, current-limiting protection module 137 and overheat protector module 139, LED drive chip 100
Processing module 170, signal processing module 170 is electrically connected with rest-set flip-flop 110, and LED drive chip 100 supports power factor school
Just, with complete defencive function, including under-voltage protection, output over-voltage protection, output short circuit protection, current-limiting protection and excess temperature are protected
Protective function.
Second embodiment
Refer to Fig. 4, the LED drive circuit 200 that the utility model second embodiment is provided, it include rectification circuit 210,
Filter circuit 230, control circuit 250 and charge-discharge circuit 270, rectification circuit 210, filter circuit 230, control circuit 250 and
Charge-discharge circuit 270 is sequentially connected electrically, and control circuit 250 includes the LED driving cores that the utility model first embodiment is provided
Piece 100.
Rectification circuit 210 is used for 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 series connection the first electric capacity C1 ground connection, and electrically connected with control circuit 250, the second output end of rectifier bridge 211 is in the one or two
Pole pipe D1 anode electrical connection, the first diode D1 negative electrode is electrically connected with filter circuit 230.
The one end of filter circuit 230 is electrically connected with the first diode D1 negative electrode, 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 that the utility model first embodiment is provided, and power tube
Q1 and current sense resistor R2, the FB pin serial connection first resistors R1 of LED drive chip 100 connect the first diode D1 negative electrode,
And series connection the second electric capacity C2 ground connection.The ZCD pins of LED drive chip 100 are electrically connected with charge-discharge circuit 270.Power tube Q1's
Drain electrode is electrically connected to the first output end of rectifier bridge 211, power tube Q1 source electrode and the Gate pins electricity of LED drive chip 100
Connection, power tube Q1 gate series current sense resistor R2 ground connection, current sense resistor R2 ungrounded end is electrically connected to LED
The CS pins of driving chip 100, and electrically connected with the first diode D1 negative electrode.
Charge-discharge circuit 270 includes transformer T1, sustained diode 3, the 3rd electric capacity C3 and load LED271, transformer
T1 main side is electrically connected with the ZCD pins of LED drive chip 100, transformer T1 secondary and the anode electricity of sustained diode 3
Connection, the negative electrode of sustained diode 3 is electrically connected with load LED271, and the 3rd electric capacity C3 is connected in parallel on load LED271 two ends.
The operation principle for the LED drive circuit 200 that the utility model second embodiment is provided is：
(1) power tube Q1 is turned on, and AC power F1 is transformed to dc source by rectification circuit 210, and dc source passes through
Power tube Q1, voltage is applied on current sense resistor R2, transformer T1 and load LED271 so that transformer T1 electric current
Rise, until reaching the time ton of the internal control of LED drive chip 100, now transformer T1 main side peak point current is assumed to
Ipp, power tube Q1 are turned off；
(2) power tube Q1 is turned off, and because transformer T1 main side does not have discharge path, therefore transformer T1 electric current passes through pair
While 3 couple of the 3rd electric capacity C3 of sustained diode and load LED271 electric discharges are flowed through, until transformer T1 electric current drops 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 obtain peak point current Ipp during power tube Q1 is turned on,
Energy is transmitted to load LED271 during power tube Q1 is turned off, then it is sustained diode 3 to load LED271 average current
Average current；Peak point current Ipp flows through current sense resistor R2 simultaneously, FB of the obtained control source to LED drive chip 100
Pin, is compared output Ctrl pin voltages afterwards with reference voltage 0.25V, and then control power tube Q1 conducting by amplifier 175
Time ton, so as to reach that output current loop is controlled.
In summary, a kind of LED drive chip that the utility model first embodiment is provided, its internal structure is touched including RS
Hair device and the under-voltage protective module electrically connected with rest-set flip-flop, overvoltage protective module, short circuit protection module, current-limiting protection module
With overheat protector module, signal processing module is also included inside LED drive chip, signal processing module is electrically connected with rest-set flip-flop
Connect, LED drive 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.
A kind of LED drive circuit that the utility model second embodiment is provided, it includes rectification circuit, filter circuit, control
Circuit and charge-discharge circuit processed, rectification circuit, filter circuit, control circuit and charge-discharge circuit are sequentially connected electrically, and control circuit
There is provided a kind of high reliability, long-life, electromagnetism are simultaneous for the LED drive chip provided including the utility model first embodiment
The good, environmental protection and energy saving of capacitive energy, the LED illumination power solution of low cost, with high PFC, high precision constant current voltage stabilizing, low work(
Consumption, peripheral applications circuit is simple, the outstanding advantages such as low cost.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property is included, so that process, method, article or equipment including a series of key elements not only include those key elements, and
And also including other key elements being not expressly set out, or also include for this process, method, article or equipment institute inherently
Key element.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for this
For the technical staff in field, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle
Within, any modifications, equivalent substitutions and improvements made etc. should be included within protection domain of the present utility model.
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 are touched
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 includes 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 Q output, functional module and the Gate pins of the rest-set flip-flop 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；
Q output, functional module, current-limiting protection module and the CS pins of the rest-set flip-flop 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 include 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；
Q output, logic module, drive module and the Gate pins of the rest-set flip-flop 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 sawtooth waveforms
Device, comparator and amplifier, the RT pins, saw-toothed wave generator, the R input of comparator and rest-set flip-flop are sequentially connected electrically,
The FB pins, amplifier, the R input of comparator and rest-set flip-flop are 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 connected with the negative input end of the amplifier, the inverting input and the amplifier of the Ctrl pins 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 claim any one of 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 is 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 described in the gate series of the power tube is grounded, the current sense resistor
The CS pins with the filter circuit and the LED drive chip are electrically connected 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621471711.8U CN206341455U (en) | 2016-12-29 | 2016-12-29 | LED drive chip and drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621471711.8U CN206341455U (en) | 2016-12-29 | 2016-12-29 | LED drive chip and drive circuit |
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| CN206341455U true CN206341455U (en) | 2017-07-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535418A (en) * | 2016-12-29 | 2017-03-22 | 重庆奥海辉龙大数据有限公司 | LED drive chip and drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535418A (en) * | 2016-12-29 | 2017-03-22 | 重庆奥海辉龙大数据有限公司 | LED drive chip and drive circuit |
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