CN103250467B - Led drive circuit and led drive chip - Google Patents
Led drive circuit and led drive chip Download PDFInfo
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- CN103250467B CN103250467B CN201180036396.XA CN201180036396A CN103250467B CN 103250467 B CN103250467 B CN 103250467B CN 201180036396 A CN201180036396 A CN 201180036396A CN 103250467 B CN103250467 B CN 103250467B
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- ballast
- control module
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- led drive
- 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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
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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
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/385—Switched mode power supply [SMPS] using flyback topology
Abstract
An LED drive chip (200) comprises a mode identification and control module, a negative impedance control module, a power tube, and a constant current/constant voltage drive control module. The LED drive chip (200) can be compatible with all kinds of ballast to provide stable power for a loaded LED lamp, and can also work without the ballast and alternating current or direct current input. An LED drive circuit applies the LED drive chip, thereby having the same beneficial effect as the LED drive chip.
Description
Technical field
The present invention relates to LED technology field, more particularly, relate to a kind of LED drive circuit and LED drive chip.
Background technology
LED light source is the hope of 21 century lighting market, progressively will replace conventional light source in future.Olympic Commission for Science & Technology point out high-brightness LED will be the mankind after Edison invented incandescent lamp, one of greatest invention.When Present Global energy shortage, the energy-conservation significant problem being us and facing.LED, as a kind of green light source product that is novel, energy-conserving and environment-protective, must be widely used.
Fluorescent lamp is the most universal illuminating lamp of current use, but the fluorescent material that fluorescent lamp uses is mostly such as, containing environmentally harmful material, tribute.This technology will progressively replace by LED illumination.In traditional substitute mode, due to daylight lamp bracket being provided with ballast, during mounted LED lamp, usually require to carry out light fixture transformation, such as ballast short circuit, remove starter etc.The object of such transformation is the two ends making AC power directly be added to LED.Above operation is very inconvenient, and alternative cost is high, significantly limit the universal of LED.
United States Patent (USP) 7067992 discloses a kind of LED drive circuit of compatible ballast.In this scenario, simply LED drive circuit is accessed ballast, without any controlling organization, the electric current exporting LED is controlled in circuit, also cannot protect LED.Operating characteristic due to ballast depends on the impedance of load, and the change along with load impedance changes by its output voltage frequency and amplitude.The LED drive circuit of the program, under different operating states, by the output causing ballast different, when showing high resistant characteristic especially before LED conducting, ballast generally can export the high pressure (being equivalent to the ignition process of fluorescent lamp) of more than 500V, thus easily causes damage to LED.In addition, the ballast in market is of a great variety, quality is uneven, and the LED drive circuit of the program accesses dissimilar ballast circuit, can not ensure the consistency of the power supply exporting LED.
In sum, cannot control the electric current exporting LED after the LED drive circuit existence access ballast circuit of existing compatible ballast, also cannot protect LED; Under different operating states, by the output causing ballast different, easily damage is caused to LED; And access dissimilar ballast circuit, can not ensure to export the defect that the power supply of LED is consistent.
Summary of the invention
The present invention is directed to the above-mentioned defect of prior art, provide a kind of can compatible various types of ballast the power supply that can ensure output LED unanimously, the LED drive circuit that can work under the operating state of AC-to DC, DC-to-DC and LED drive chip.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of LED drive chip, comprising:
Identify the power supply type of ballast circuit out-put supply end with generate corresponding operating mode control signals and export, pattern recognition that ballast is normally worked and control module, wherein, described ballast is Inductive ballast, passive electronic ballast or active electronic ballast;
Receive the power supply of described operating mode control signals and ballast circuit out-put supply end to control the negative impedance control module of the inside equiva lent impedance change of described chip;
Drain electrode is connected with the primary inductance of peripheral drive circuit, source electrode is through the power tube of the grounding through resistance of external drive circuit;
Be connected, controlled by the supply voltage of the ballast circuit out-put supply end after detecting step-down and peripheral drive circuit primary inductance voltage the constant current/constant voltage drive control module that the switching frequency of described power tube and duty ratio export to realize constant current/voltage with the grid of described power tube; First to the 8th pin; Wherein, described pattern recognition and control module are connected ballast circuit out-put supply end with negative impedance control module respectively by the first pin; Described pattern recognition and control module are connected with the first load unit of peripheral drive circuit by the second pin; The drain electrode of described power tube is connected with the primary inductance of peripheral drive circuit by three-prong, and its source electrode is by the electric current of the auxiliary induction of the 4th pin senses peripheral drive circuit; Described pattern recognition and control module and described constant current/constant voltage drive control module are by the supply voltage of the ballast circuit out-put supply end after the 5th pin access step-down, described constant current/constant voltage drive control module is connected with the auxiliary induction of peripheral drive circuit by the 6th pin, described constant current/constant voltage drive control module is by the voltage of the auxiliary induction of the peripheral drive circuit after the 7th pin access step-down, and described constant current/constant voltage drive control module is by described 8th pin ground connection.
LED drive chip of the present invention, also comprises the protection module being connected, monitoring to realize to the power supply of ballast circuit out-put supply end overvoltage to described constant current/constant voltage drive control module, overcurrent protection by the first pin with ballast circuit out-put supply end.
A kind of LED drive circuit is provided, comprise the protective circuit and LED power supply circuits that are connected with ballast circuit out-put supply end, wherein, described LED power supply circuits comprise be connected with described protective circuit primary inductance, to form secondary inductance that mutual inductance also powers for LED with described primary inductance and form the auxiliary induction of mutual inductance with described secondary inductance; Described LED drive circuit also comprises: LED drive chip, the first load unit controlled by described LED drive chip and auxiliary resistance; Wherein, the first load unit is connected between ballast circuit out-put supply end and ground; Described LED drive chip comprises:
Identify the power supply type of ballast circuit out-put supply end with generate corresponding operating mode control signals and export, pattern recognition and the control module of described first load unit that normally works according to ballast, controls, wherein, described ballast is Inductive ballast, passive electronic ballast or active electronic ballast;
Receive the power supply of described operating mode control signals and ballast circuit out-put supply end to control the negative impedance control module of the inner equiva lent impedance change of described LED drive chip;
Drain electrode is connected with described primary inductance, source electrode is through the power tube of described auxiliary resistance ground connection;
Be connected, controlled by the supply voltage of the ballast circuit out-put supply end after detecting step-down and described primary inductance voltage the constant current/constant voltage drive control module that the switching frequency of described power tube and duty ratio export to realize constant current/voltage with the grid of described power tube;
First to the 8th pin; Wherein, described pattern recognition and control module are all connected ballast circuit out-put supply end by the first pin with negative impedance control module; Described pattern recognition and control module are connected with the first load unit of peripheral drive circuit by the second pin; The drain electrode of described power tube is connected with the primary inductance of peripheral drive circuit by three-prong, and its source electrode is by the electric current of the auxiliary induction of the 4th pin senses peripheral drive circuit; Described pattern recognition and control module and described constant current/constant voltage drive control module are by the supply voltage of the ballast circuit out-put supply end after the 5th pin access step-down, described constant current/constant voltage drive control module is connected with the auxiliary induction of peripheral drive circuit by the 6th pin, described constant current/constant voltage drive control module is by the voltage of the auxiliary induction of the peripheral drive circuit after the 7th pin access step-down, and described constant current/constant voltage drive control module is by described 8th pin ground connection.LED drive circuit of the present invention, also comprises:
Be connected in parallel on first electric capacity at described secondary inductance two ends;
The first diode that positive pole connects described secondary inductance, negative pole connects described first electric capacity; And
Be connected in parallel on described auxiliary induction two ends, the first resistance be one another in series and the second resistance.
LED drive circuit of the present invention, described protective circuit comprises:
The 3rd resistance be connected between ballast circuit out-put supply end and ground, being one another in series and the 4th resistance;
Be connected to the second electric capacity between ballast circuit out-put supply end and ground;
Be connected in parallel on the 3rd electric capacity at described primary inductance two ends, the 5th resistance and the second diode, wherein, described 3rd electric capacity and the 5th resistor coupled in parallel, described 3rd electric capacity and the 5th resistor coupled in parallel are overall with described second Diode series.
LED drive circuit of the present invention, also comprises the 3rd diode and the 4th electric capacity, and wherein, described 3rd diode cathode connects described auxiliary induction, negative pole through described 4th capacity earth; Described auxiliary resistance is connected to the described 4th between pin and ground.
Preferably described LED drive chip is also comprised and is connected with ballast circuit out-put supply end by described first pin, monitors to realize the protection module to described constant current/constant voltage drive control module overvoltage, overcurrent protection to the power supply of ballast circuit out-put supply end.
LED drive chip of the present invention has following beneficial effect: ballast is normally worked by the power supply type of pattern recognition and control module identification ballast circuit out-put supply end, LED drive chip of the present invention can be worked and compatible various ballast at direct current or under exchanging input; And pattern recognition and control module, by controlling negative impedance control module, make to define effective feedback loop between LED drive chip and ballast circuit, ensure the stable of ballast circuit output voltage; Constant current/constant voltage drive control module reaches constant current/voltage by the switching frequency and duty ratio controlling power tube and exports; enable LED drive chip of the present invention after the ballast circuit that access is dissimilar; the power supply of output loading LED is consistent, protects LED.
In addition, the protection module of LED drive chip of the present invention, achieves the input overvoltage to LED drive chip, overcurrent protection, guarantees that LED drive chip works in the voltage, current range of safety.
LED drive circuit of the present invention has following beneficial effect: LED chip wherein can identify ballast circuit out-put supply end power supply type and under being operated in corresponding operating state, thus make LED drive chip of the present invention can direct current or exchange input under work; LED chip is by control first load unit; make LED drive circuit after the ballast circuit that access is dissimilar; dissimilar ballast is allowed normally to work; and ensure that the power supply stablized, make LED drive circuit output loading LED of ballast circuit output voltage is consistent, protect LED.
Accompanying drawing explanation
Fig. 1 is the structure chart of the first embodiment of LED drive chip of the present invention;
Fig. 2 is the structure chart of the second embodiment of LED drive chip of the present invention;
Fig. 3 is the structure chart of the 3rd embodiment of LED drive chip of the present invention;
Fig. 4 is the circuit diagram of the 5th embodiment of LED drive circuit of the present invention;
Fig. 5 is the workflow diagram after LED drive circuit preferred embodiment of the present invention access ballast circuit;
Fig. 6 is the drive circuit circuit diagram of LED drive chip of the present invention when being applied to ballast-free and being input as alternating current;
Fig. 7 is the drive circuit circuit diagram under LED drive chip of the present invention is applied to direct current input condition.
Embodiment
Enter to explain and explanation to LED drive circuit of the present invention and LED drive chip below in conjunction with drawings and Examples.
The invention discloses a kind of can compatible various ballast LED drive chip and apply the LED drive circuit of described LED drive chip, further, LED drive chip of the present invention and LED drive circuit can work when being input as direct current or alternating current.
Fig. 1 is the structure chart of the first embodiment of LED drive chip of the present invention, and as shown in Figure 1, in the present embodiment, LED drive chip comprises:
Identify the power supply type of ballast circuit out-put supply end with generate corresponding operating mode control signals and export, pattern recognition that ballast is normally worked and control module 201;
Receive the power supply of described operating mode control signals and ballast circuit out-put supply end to control the negative impedance control module 202 of the inside equiva lent impedance change of LED drive chip;
Drain electrode is connected with the primary inductance of peripheral drive circuit, source electrode is through the power tube 203 of the grounding through resistance of peripheral drive circuit;
Be connected, controlled by the supply voltage of the ballast circuit out-put supply end after detecting step-down and peripheral drive circuit primary inductance voltage the constant current/constant voltage drive control module 204 that the switching frequency of power tube 203 and duty ratio export to realize constant current/voltage with the grid of power tube 203.
Those skilled in the art can understand, different ballasts (ballast circuit) is started by different modes, enters normal work, such as, Inductive ballast passes through starter, passive electronic ballast is by self-oscillation, and active electronic ballast (by chip controls) is by controlling concussion frequency etc.In actual design, generally can't limit the type of ballast, but the output of automatic compatible different ballast.The output of Inductive ballast (inductive ballast circuit) is low frequency ac, the output high-frequency alternating current of electric ballast (circuit of electronic ballast), due to high frequency, the electric ballast (circuit of electronic ballast) after capacitor filtering exports close to direct current.In order to allow LED chip can adapt to various ballast (ballast circuit), this just requires that LED drive chip can work under alternating current, can work under d.c. current again.
In an embodiment, pattern recognition and control module 201 identify that the power supply type of ballast circuit out-put supply end is to generate corresponding operating mode control signals, and the operating mode control signals of generation is exported to negative impedance control module 202.Negative impedance control module 202 changes with the inside equiva lent impedance controlling LED drive chip according to the power supply of the described operating mode control signals received and ballast circuit out-put supply end, when ballast circuit output voltage increases, negative impedance control module 202 controls the inner equiva lent impedance of LED drive chip and reduces, to suppress the further rising of ballast circuit output voltage, and then reduce this voltage, make between LED drive chip and ballast, to define effective feedback loop, ensure the stable of ballast circuit output voltage.Constant current/constant voltage drive control module 204 is connected with the grid of power tube 203, controlled the switching frequency of power tube 203 by the supply voltage of the ballast circuit out-put supply end after detecting step-down and peripheral drive circuit primary inductance voltage and duty ratio exports to realize constant current/voltage.
Therefore, LED drive chip of the present invention can adapt to different ballast circuits and export, using the output of different ballast circuits as the input power of LED drive chip, and, when the output of ballast circuit be direct current (after capacitor filtering) or low-frequency ac, LED drive chip can normally work.
Fig. 2 is the structure chart of the second embodiment of LED drive chip of the present invention, and as shown in Figure 2, in the present embodiment, LED drive chip also comprises the first to the 8th pin; Wherein, pattern recognition and control module 201 are connected ballast circuit out-put supply end with negative impedance control module 202 respectively by the first pin two 05; Pattern recognition and control module 201 are connected with the first load unit of peripheral drive circuit by the second pin two 06; The drain electrode of power tube 203 is connected with the primary inductance of peripheral drive circuit by three-prong 207, and its source electrode detects the electric current of the auxiliary induction of peripheral drive circuit by the 4th pin two 08; Pattern recognition and control module 201 and constant current/constant voltage drive control module 204 access the supply voltage of the ballast circuit out-put supply end after step-down by the 5th pin two 09, constant current/constant voltage drive control module 204 is connected with the auxiliary induction of peripheral drive circuit by the 6th pin two 10, constant current/constant voltage drive control module 204 accesses the voltage of the auxiliary induction of the peripheral drive circuit after step-down by the 7th pin two 11, and constant current/constant voltage drive control module 204 is by described 8th pin two 12 ground connection.In the present embodiment, all the other situations are identical with the first embodiment of LED drive chip of the present invention, do not repeat them here.In other embodiment of LED drive chip of the present invention, LED drive chip can also comprise other pin, for the connection of chip and external drive circuit.
In the present embodiment, particularly, pattern recognition and control module 201 carry out the voltage/current curve of emulating fluorescent lamp, thus allow ballast normally work.Those skilled in the art can understand that ballast normally starts, the voltage/current characteristic of the fluorescent lamp of need of work, therefore those skilled in the art normally can to start in conjunction with ballast according to technical scheme disclosed by the invention, the voltage/current characteristic of the fluorescent lamp of need of work allows ballast normally work.
Fig. 3 is the structure chart of the 3rd embodiment of LED drive chip of the present invention; as shown in Figure 3; in the present embodiment; LED drive chip also comprises the protection module 213 of monitoring to realize overvoltage to constant current/constant voltage drive control module 204, overcurrent protection to the power supply of ballast circuit out-put supply end, and protection module 213 connects ballast circuit out-put supply end by the first pin two 05.In the present embodiment, all the other situations are identical with the second embodiment, do not repeat them here.In other embodiments of the invention, protection module 213 can also obtain the out-put supply of ballast circuit by other pin or other module.
In the present embodiment, the power supply of protection module 213 pairs of ballast circuit out-put supply ends is monitored, and sends guard signal to constant current/constant voltage drive control module 204, ensures the current/voltage operated within range of LED drive chip in safety.
LED drive chip of the present invention equally can when there is no ballast (ballast circuit), input power supply be wherein exchange or direct current when work.Both of these case, is described the drive circuit in conjunction with chip exterior.
At the circuit diagram of the first embodiment of LED drive circuit of the present invention, see Fig. 1 and Fig. 4, in the present embodiment, LED drive circuit comprises the protective circuit 100 and LED power supply circuits 300 that are connected with ballast circuit out-put supply end; Wherein, LED power supply circuits 300 comprise be connected with protective circuit 100 primary inductance 301, form mutual inductance with primary inductance 301 and the secondary inductance 302 of powering for LED and form the auxiliary induction 305 of mutual inductance with secondary inductance 302, LED drive chip 200, by the first load unit 400 that LED drive chip 200 controls, and auxiliary resistance 700; Wherein, the first load unit 400 is connected between ballast circuit out-put supply end and ground; LED drive chip 200 comprises:
Identify the power supply type of ballast circuit out-put supply end with generate corresponding operating mode control signals and export, pattern recognition and the control module 201 of described first load unit 400 that normally works according to ballast, controls;
Receive the power supply of operating mode control signals and ballast circuit out-put supply end to control the negative impedance control module 202 of the inner equiva lent impedance change of LED drive chip 200;
Drain electrode is connected with primary inductance 301, source electrode is through the power tube 203 of auxiliary resistance 700 ground connection;
Be connected, controlled by the supply voltage of the ballast circuit out-put supply end after detecting step-down and primary inductance 301 voltage the constant current/constant voltage drive control module 204 that the switching frequency of power tube 203 and duty ratio export to realize constant current/voltage with the grid of power tube 203.
In the present embodiment, described ballast circuit out-put supply end refers to the output after have passed through rectifier bridge.LED drive chip 200 is wherein the LED drive chip described in the first embodiment of LED drive chip of the present invention.
LED drive circuit of the present invention, its LED chip 200 can identify ballast circuit out-put supply end power supply type and under being operated in corresponding operating state, thus LED drive chip can be worked at direct current or under exchanging input, and then LED drive circuit of the present invention can be worked at direct current or under exchanging input; LED chip 200 is by control first load unit 400; make LED drive circuit after the ballast circuit that access is dissimilar; dissimilar ballast is allowed normally to work; and ensure that the power supply stablized, make LED drive circuit output loading LED of ballast circuit output voltage is consistent, protect LED.
In the second embodiment of LED drive circuit of the present invention, see Fig. 4, in the present embodiment, LED power supply circuits 300 also comprise:
Be connected in parallel on first electric capacity 303 at secondary inductance 302 two ends;
The first diode 304 that positive pole connects secondary inductance 302, negative pole connects the first electric capacity 30; And
The first resistance 306 and the second resistance 307 be connected in parallel on auxiliary induction 305 two ends, being one another in series.
In the present embodiment, all the other situations are identical with the first embodiment of LED drive circuit of the present invention, do not repeat them here.
In the 3rd embodiment of LED drive circuit of the present invention, see Fig. 4, in the present embodiment, protective circuit 100 comprises:
The 3rd resistance 101 be connected between ballast circuit out-put supply end and ground, being one another in series and the 4th resistance 102;
Be connected to the second electric capacity 103 between ballast circuit out-put supply end and ground;
Be connected in parallel on the 3rd electric capacity 104 at primary inductance 301 two ends, the 5th resistance 105 and the second diode 106, wherein, the 3rd electric capacity 104 and the parallel connection of the 5th resistance 105, the 3rd electric capacity 104 and the 5th resistance 105 entirety in parallel are connected with the second diode 106.
In the present embodiment, all the other situations are identical with the second embodiment of LED drive circuit of the present invention, do not repeat them here.
In the present embodiment, the effect of the circuit of the 3rd electric capacity 104, the 5th resistance 105 and the second diode 106 formation is the power tube 203 in protection LED drive chip 200.
In the 4th embodiment of LED drive circuit of the present invention, see Fig. 2 and Fig. 4, in the present embodiment, LED drive chip 200 also comprises the first to the 8th pin; Wherein, pattern recognition and control module 201 are connected with ballast circuit out-put supply end respectively by the first pin two 05 with negative impedance control module 202; Pattern recognition and control module 201 are connected with the first load unit 400 by the second pin two 06; The drain electrode of power tube 203 is connected with primary inductance 301 by three-prong 207, and its source electrode detects auxiliary induction 305 electric current by the 4th pin two 08; Pattern recognition and control module 201 and constant current/constant voltage drive control module 204 are connected to the node of the 3rd resistance 101 and the 4th resistance 102 by the 5th pin two 09, be connected with auxiliary induction 305 by the 6th pin two 10, the node of the first resistance 306 and the second resistance 307 is connected to by the 7th pin two 11, and by the 8th pin two 12 ground connection.In the present embodiment, all the other situations are identical with the 3rd embodiment of LED drive circuit of the present invention, do not repeat them here.
Fig. 4 is the circuit diagram of the 5th embodiment of LED drive circuit of the present invention, as shown in Figure 4, in the present embodiment, LED drive circuit also comprises the 3rd diode 500 and the 4th electric capacity 600, wherein, the 3rd diode 500 positive pole connects auxiliary induction 305, negative pole through the 4th electric capacity 600 ground connection; Auxiliary resistance 700 is connected between the 4th pin two 08 and ground.In the present embodiment, all the other situations are identical with the 4th embodiment of LED drive circuit of the present invention, do not repeat them here.
In the present embodiment, because the 6th pin two 10 is the power input of LED drive chip 200, by arranging the 3rd diode 500 and the 4th electric capacity 600 carries out voltage stabilizing.
In the preferred embodiment of LED drive circuit of the present invention; see Fig. 3 and Fig. 4, LED drive chip 200 is also comprised and is connected with ballast circuit out-put supply end by the first pin two 05, monitors to realize the protection module 213 to the overvoltage of described constant current/constant voltage drive control module 204, overcurrent protection to the power supply of ballast circuit out-put supply end.
Fig. 5 is the workflow diagram after LED drive circuit preferred embodiment of the present invention access ballast circuit.As shown in Figure 5, flow process starts from step S501, step S502: ballast starts and enters preheating mode, step S503:LED driving chip electrifying startup starting protection module, step S504: pattern recognition and control module control the first load unit makes ballast normally work, step S505: the inside equiva lent impedance change of negative impedance control module control chip is to make ballast stable output voltage, step S506: constant current/constant voltage drive control module realizes constant current/voltage and exports, step S507:LED power supply circuits stable output power supply is powered to load LED lamp, flow process ends at step S508.
The situation that LED drive chip of the present invention also may be used for not having the alternating current of ballast to input, Fig. 6 is the drive circuit circuit diagram of LED drive chip of the present invention when being applied to ballast-free and being input as alternating current, as shown in Figure 6, applying in the LED drive circuit of LED drive chip of the present invention except not needing the first load unit 400 (see Fig. 4) now, all the other connections are identical with the 5th embodiment of LED drive circuit of the present invention, do not repeat them here.
AC power is 85V to 265V alternating-current voltage source by the power supply of filter and rectifier bridge input LED drive circuit.See Fig. 2, the constant current/constant voltage drive control module 204 of LED drive chip 200 passes through the AC power of the input of the 5th pin senses after the 3rd resistance 101 and the 4th resistance 102 dividing potential drop, as internal reference value.The power tube 203 of LED drive chip 200 is after reset signal is opened first, electric current flows into LED drive chip 200 through the 3rd diode 500 from the 6th pin two 10, thus flowing into power tube 203 and auxiliary resistance 700, the constant current/constant voltage drive control module 204 of LED drive chip 200 monitors the magnitude of voltage of the 4th pin two 08.Once the magnitude of voltage of the 4th pin two 08 exceedes the above-mentioned magnitude of voltage as internal reference value, power tube 203 is closed by constant current/constant voltage drive control module 204.Now, the first diode 304 conducting, secondary inductance 302 is powered to the first electric capacity 303 and load LED lamp.After secondary inductance 302 electric current releases, the drain electrode of the power tube 203 of LED drive chip 200 and auxiliary induction 305 are with frequency resonance.When the constant current/constant voltage drive control module 204 of LED drive chip 200 detects trough (low ebb of auxiliary induction 305 resonance wave voltage is also power tube 203 drain voltage low ebb) of auxiliary induction 305 resonance wave time, power tube 203 is opened.Wherein, constant current/constant voltage drive control module 204 is detected the voltage of the auxiliary induction 305 after the first resistance 306 and the second resistance 307 dividing potential drop.
LED drive chip of the present invention also may be used for the situation of direct current input, and Fig. 7 is the drive circuit circuit diagram under LED drive chip of the present invention is applied to direct current input condition, as shown in Figure 7.Now, LED drive circuit comprises the second or the 3rd LED drive chip 200 in embodiment of LED drive chip of the present invention, be connected between DC power supply 701 output, the first regulating resistance 702 and the second regulating resistance 703 be one another in series, positive pole connects the three-prong 207 of LED drive chip 200, negative pole connects the 4th diode 704 of DC power supply 701 positive pole, one end connects the three-prong 207 of LED drive chip 200, 4th inductance 705 of another termination load LED lamp, one end ground connection, 3rd regulating resistance 706 of the 4th pin two 08 of one termination LED drive chip 200, and one end ground connection, one end is connected to the 5th electric capacity 707 of the node of the first regulating resistance 702 and the second regulating resistance 703.6th pin two 10 of LED drive chip 200 is connected to the node of the first regulating resistance 702 and the second regulating resistance 703, the 8th pin two 12 ground connection.The positive pole that load LED lamp one end connects the 4th inductance 705, the other end connects DC power supply 701.
Six pin two 10 of voltage through inputting LED drive chip 200 after the first regulating resistance 702 and the second regulating resistance 703 dividing potential drop of DC power supply 701 inputs the voltage of LED drive chip 200.Power tube 203 opened by the clock of constant current/constant voltage drive control module 204 inside of LED drive chip 200, and DC power supply 701 pairs of load LED lamp 708 are powered.When electric voltage over press on the 3rd regulating resistance 706 time, constant current/constant voltage drive control module 204 closes power tube 203.4th diode 704 forward conduction, the 4th inductance 705 couples of load LED etc. 708 power.
Can be improved appropriately LED drive circuit according to the present invention and LED drive chip in concrete implementation process, to adapt to the specific requirement of concrete condition.Therefore be appreciated that and just play exemplary role according to the specific embodiment of the present invention, and be different from and limit the scope of the invention.
Claims (7)
1. a LED drive chip, is characterized in that, comprising:
Identify the power supply type of ballast circuit out-put supply end with generate corresponding operating mode control signals and export, pattern recognition that ballast is normally worked and control module (201), wherein, described ballast is Inductive ballast, passive electronic ballast or active electronic ballast;
Receive the power supply of described operating mode control signals and ballast circuit out-put supply end to control the negative impedance control module (202) of the inside equiva lent impedance change of described chip;
Drain electrode is connected with the primary inductance of peripheral drive circuit, source electrode is through the power tube (203) of the grounding through resistance of peripheral drive circuit;
Be connected, controlled by the supply voltage of the ballast circuit out-put supply end after detecting step-down and peripheral drive circuit primary inductance voltage the constant current/constant voltage drive control module (204) that the switching frequency of described power tube (203) and duty ratio export to realize constant current/voltage with the grid of described power tube (203);
First to the 8th pin, wherein, described pattern recognition and control module (201) are all connected ballast circuit out-put supply end by the first pin (205) with negative impedance control module (202), described pattern recognition and control module (201) are connected with the first load unit of peripheral drive circuit by the second pin (206), the drain electrode of described power tube (203) is connected with the primary inductance of peripheral drive circuit by three-prong (207), and its source electrode detects the electric current of the auxiliary induction of peripheral drive circuit by the 4th pin (208), described pattern recognition and control module (201) and described constant current/constant voltage drive control module (204) are by the supply voltage of the ballast circuit out-put supply end after the 5th pin (209) access step-down, described constant current/constant voltage drive control module (204) is connected with the auxiliary induction of peripheral drive circuit by the 6th pin (210), described constant current/constant voltage drive control module (204) is by the voltage of the auxiliary induction of the peripheral drive circuit after the 7th pin (211) access step-down, and described constant current/constant voltage drive control module (204) is by described 8th pin (212) ground connection.
2. LED drive chip according to claim 1; it is characterized in that, described chip also comprises the protection module (213) being connected, monitoring to realize to the power supply of ballast circuit out-put supply end overvoltage to described constant current/constant voltage drive control module (204), overcurrent protection by the first pin (205) with ballast circuit out-put supply end.
3. a LED drive circuit, comprise the protective circuit (100) and LED power supply circuits (300) that are connected with ballast circuit out-put supply end, wherein, described LED power supply circuits (300) comprise the primary inductance (301) be connected with described protective circuit (100), mutual inductance is formed and the secondary inductance (302) of powering for LED and form the auxiliary induction (305) of mutual inductance with described secondary inductance (302) with described primary inductance (301), it is characterized in that, described LED drive circuit also comprises: LED drive chip (200), the first load unit (400) controlled by described LED drive chip (200) and auxiliary resistance (700), wherein, the first load unit (400) is connected between ballast circuit out-put supply end and ground, described LED drive chip (200) comprising:
Identify the power supply type of ballast circuit out-put supply end with generate corresponding operating mode control signals and export, pattern recognition and the control module (201) of described first load unit (400) that normally works according to ballast, controls, wherein, described ballast is Inductive ballast, passive electronic ballast or active electronic ballast;
Receive the power supply of described operating mode control signals and ballast circuit out-put supply end to control the negative impedance control module (202) of the inner equiva lent impedance change of described LED drive chip (200);
Drain electrode is connected with described primary inductance (301), source electrode is through the power tube (203) of described auxiliary resistance (700) ground connection;
Be connected, controlled by the supply voltage of the ballast circuit out-put supply end after detecting step-down and described primary inductance (301) voltage the constant current/constant voltage drive control module (204) that the switching frequency of described power tube (203) and duty ratio export to realize constant current/voltage with the grid of described power tube (203);
First to the 8th pin, wherein, described pattern recognition and control module (201) are all connected ballast circuit out-put supply end by the first pin (205) with negative impedance control module (202), described pattern recognition and control module (201) are connected with the first load unit of peripheral drive circuit by the second pin (206), the drain electrode of described power tube (203) is connected with the primary inductance of peripheral drive circuit by three-prong (207), and its source electrode detects the electric current of the auxiliary induction of peripheral drive circuit by the 4th pin (208), described pattern recognition and control module (201) and described constant current/constant voltage drive control module (204) are by the supply voltage of the ballast circuit out-put supply end after the 5th pin (209) access step-down, described constant current/constant voltage drive control module (204) is connected with the auxiliary induction of peripheral drive circuit by the 6th pin (210), described constant current/constant voltage drive control module (204) is by the voltage of the auxiliary induction of the peripheral drive circuit after the 7th pin (211) access step-down, and described constant current/constant voltage drive control module (204) is by described 8th pin (212) ground connection.
4. LED drive circuit according to claim 3, is characterized in that, described LED power supply circuits (300) also comprise:
Be connected in parallel on first electric capacity (303) at described secondary inductance (302) two ends;
The first diode (304) that positive pole connects described secondary inductance (302), negative pole connects described first electric capacity (303); And
Be connected in parallel on described auxiliary induction (305) two ends, the first resistance (306) be one another in series and the second resistance (307).
5. LED drive circuit according to claim 4, is characterized in that, described protective circuit (100) comprising:
The 3rd resistance (101) be connected between ballast circuit out-put supply end and ground, being one another in series and the 4th resistance (102);
Be connected to the second electric capacity (103) between ballast circuit out-put supply end and ground;
Be connected in parallel on the 3rd electric capacity (104) at described primary inductance (301) two ends, the 5th resistance (105) and the second diode (106), wherein, described 3rd electric capacity (104) and the parallel connection of the 5th resistance (105), described 3rd electric capacity (104) and the 5th resistance (105) entirety in parallel are connected with described second diode (106).
6. LED drive circuit according to claim 5, it is characterized in that, described LED drive circuit also comprises the 3rd diode (500) and the 4th electric capacity (600), wherein, described 3rd diode (500) positive pole connects described auxiliary induction (305), negative pole through described 4th electric capacity (600) ground connection; Described auxiliary resistance (700) is connected between described 4th pin (208) and ground.
7. the LED drive circuit according to claim 5 or 6; it is characterized in that, described LED drive chip (200) is also comprised and is connected with ballast circuit out-put supply end by described first pin (205), monitors to realize the protection module (213) to described constant current/constant voltage drive control module (204) overvoltage, overcurrent protection to the power supply of ballast circuit out-put supply end.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2011/083344 WO2013078669A1 (en) | 2011-12-02 | 2011-12-02 | Led drive circuit and led drive chip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103250467A CN103250467A (en) | 2013-08-14 |
| CN103250467B true CN103250467B (en) | 2015-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180036396.XA Active CN103250467B (en) | 2011-12-02 | 2011-12-02 | Led drive circuit and led drive chip |
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| Country | Link |
|---|---|
| CN (1) | CN103250467B (en) |
| WO (1) | WO2013078669A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102104684B1 (en) * | 2014-12-08 | 2020-06-01 | 매그나칩 반도체 유한회사 | Circuit detecting ballast type and light emitting diode light apparatus comprising the same |
| CN105430843B (en) * | 2015-12-02 | 2023-08-04 | 上海航空电器有限公司 | Anti-collision lamp circuit with LED constant voltage constant current drive and stroboscopic control |
| CN105979630B (en) * | 2016-06-08 | 2018-02-09 | 杰华特微电子（杭州）有限公司 | Led drive circuit |
| CN108575018A (en) * | 2017-08-24 | 2018-09-25 | 常州星宇车灯股份有限公司 | A kind of Switching Power Supply single-string LED short-circuit detecting feedback circuit |
| CN107834624A (en) * | 2017-10-23 | 2018-03-23 | 大同裕隆环保有限责任公司 | Intelligent charging frame charge information remote comprehensive manages module |
| CN107734777B (en) * | 2017-11-09 | 2023-10-27 | 深圳市瑞之辰科技有限公司 | LED driving chip, LED driving circuit and LED lighting device |
| CN108196184B (en) * | 2018-01-25 | 2023-06-20 | 昆明理工大学 | XL series boost chip detection device and method |
| CN110190507A (en) * | 2019-07-05 | 2019-08-30 | 苏州全视智能光电有限公司 | A kind of low-power laser and its driving circuit |
| CN110599949B (en) * | 2019-09-20 | 2021-11-26 | 深圳市洲明科技股份有限公司 | LED box body and system card and display module thereof |
| CN110996457B (en) * | 2019-12-31 | 2023-05-23 | 惠州视维新技术有限公司 | LED driving circuit, device, LED control protection method and storage medium |
| CN112492718B (en) * | 2020-12-02 | 2023-05-16 | 上海裕芯电子科技有限公司 | Low-voltage over-temperature and down-flow LED driving circuit |
| CN113271697A (en) * | 2021-04-29 | 2021-08-17 | 江苏日月照明电器有限公司 | Double-end intelligent stepless dimming T8LED lamp tube |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201174799Y (en) * | 2008-03-19 | 2008-12-31 | 杨书水 | Electronic ballast for AC large power LED illuminating energy saving lamp |
| JP2009245790A (en) * | 2008-03-31 | 2009-10-22 | Nippon Telegr & Teleph Corp <Ntt> | Lighting device |
| CN201234390Y (en) * | 2008-07-18 | 2009-05-06 | 金诗电子技术(上海)有限公司 | High light modulation ratio LED driving chip |
| CN201331030Y (en) * | 2009-02-11 | 2009-10-21 | 东莞市龙立祥照明科技有限公司 | LED circuit |
| CN101965078B (en) * | 2009-07-22 | 2013-09-04 | 深圳市桑达实业股份有限公司 | Light emitting diode drive circuit, light emitting diode luminaire and light emitting diode lighting system |
| CN201781658U (en) * | 2010-06-01 | 2011-03-30 | 浙江红剑集团有限公司 | Direct-current high-voltage constant-current source circuit |
| CN202335026U (en) * | 2011-12-02 | 2012-07-11 | 叶军 | LED (light-emitting diode) drive circuit and LED drive chip |
-
2011
- 2011-12-02 CN CN201180036396.XA patent/CN103250467B/en active Active
- 2011-12-02 WO PCT/CN2011/083344 patent/WO2013078669A1/en active Application Filing
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| CN103250467A (en) | 2013-08-14 |
| WO2013078669A1 (en) | 2013-06-06 |
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