TWM414050U - LED driver circuit - Google Patents

Description

M414050 V. New description: [New technical field] This creation relates to the field of circuits, and more particularly to a light emittertin (LED) driver circuit. [Prior Art] In the context of the shortage of energy and environmental awareness, countries around the world are vigorously developing green festivals. As an energy-saving ring, the LED lighting industry is rapidly developing due to the value of _ home and various levels. Therefore, the requirements of the LED driver circuit are constantly improving, such as sinfulness, efficiency, high constant current accuracy, low system cost, small circuit size, and safe isolation of the red ED drive circuit. The original coffee driver circuit adopts a secondary flow control scheme, which has a complicated structure, many unit devices, and high system cost, which is disadvantageous for reducing the volume of the LED driver. [New content] In view of the above problems, the present invention provides a dragon LED driver circuit. The LED driver circuit of the embodiment of the bridge includes: an electromagnetic interference suppression circuit, a ί路(四) ship circuit, and a money circuit. Shot, electromagnetic interference = product = electric π input ΐ, the input end of the power supply circuit, and the output end of the led drive block are connected, the input end of the output 2 and 3 voltage regulators and the output of the bridge rectifier filter circuit are driven by the H circuit. The input end, the input end of the power supply circuit, and the transformer input terminal are connected; the input end of the output DC circuit is connected to the input end of the integrated circuit of the high frequency sampling and anti-ED driver module module; = The output of the wheel-out terminal is connected to the output of the LED driver. Bipolar junctl0n Transistor (BJT) output and high frequency change, electricity day

And the t-flow detection circuit and the LED driver module take care of the circuit to overcome the shortcomings of the prior art and provide a high Z-introduction cost low isolation spurious LED to turn the unit device less Small size and high efficiency. /, there is an interval between the roads, [Embodiment] Various features and exemplary embodiments are covered. The following descriptions cover the specific squad to provide a comprehensive understanding of the creation. but

It is obvious to the skilled person that this work can be carried out without some (4) of these specific details. The following description of the embodiments is merely provided to provide a clearer understanding of the present invention. This creation is not limited to any specific configuration, but it does not detract from any modification, replacement and improvement of related elements or components without departing from the spirit of this creation. > Fig. 1 is a block diagram showing an LED driver circuit according to the present embodiment. As shown in the figure, the LED driver · electromagnetic interference (dake magnetiemterference, EMI) suppression circuit bridge bridge rectifier circuit 2, high frequency absorber τ, current detection circuit 3, output DC circuit 4, sampling anti-ship 5 And LED drive pure module face circuit (four) e (four) ^ circuit, IC) 6. The arrow line shown in Figure 1 represents the direction of transmission of the signal. In the LED driver circuit shown in Fig. 1, the circle suppression circuit can be placed in front of the bridge rectifier chopper circuit 2, or the thief can be directly connected in the form of a bridge-type rectification filter circuit or in the form of a 渡-type wave. The high-frequency transformer τ; the high-frequency viewer τ has a primary side winding, a secondary side winding, and a three-in-one group of the counter-action group, and the towel has a scale to receive the rectification wave, the road 2 or the ΕΜΙ suppression circuit 丨 'two unwinding connection The output DC circuit 4, the feedback winding starts the bridge-type rectification and filtering circuit 2 via the network voltage, and simultaneously supplies the LED driving block 1 (:: circuit 6 power supply 'feedback 敝 circuit is also connected to the sampling feedback circuit 5, thereby inputting the alternating current and the output direct current Complete isolation' Therefore, the LED driver circuit does not use the light-exhausting peripheral circuit, which reduces the system cost's reduced LED driver volume; the current detection circuit 3 connects the LED driver module 1C circuit 6' through the detection of high acid pressure II τ The current of the tender group comes to the secondary output DC 4 M414050 The circuit 4 outputs a constant current to the LED lamp. The flute 7 2 diagram shows the schematic diagram of the (10)_ circuit according to the present embodiment. As in the embodiment, the driver circuit includes two power input terminals (the two ... - I, the power supply AC connection) and a power output (the power output output value flow ^ 'E] ^ H circuit 1 - end Connected to the AC power supply, the terminal is connected to the input 4 of the bridge rectifier wave circuit 2, and the output of the bridge rectifier filter and wave circuit 2 is connected to the high frequency variable transformer primary winding (also referred to as the primary side winding) Np; The transformer τ includes three windings: the initial group ^, the secondary winding (also called the secondary winding) NS and the feedback winding Ν; the primary winding end is connected to the bridge wire H circuit 2, the financial connection LED crane block IC Circuit 6 • The secondary winding Ns is connected to the output DC circuit 4 to provide a value flow to the LED lamp; the feedback winding to one end is connected to the sample feedback circuit 5 (the sample feedback circuit provides a feedback signal for the LED driver circuit module busy circuit 6) and the power supply circuit 7 (The power supply circuit supplies power to the LED _ circuit module ic circuit 6) 'other end grounding; one end of the current detecting circuit 3 is connected to the LED driver C circuit 6' and one end is grounded. In the second embodiment, Sin suppression circuit 1 includes inductor U and capacitor CX The end of the inductor L1 is connected to the AC power supply AC, the other end is connected to the input end of the capacitor cx and the bridge rectifier chopper 2, and the other end of the capacitor cx is connected to the other end of the AC power supply ac and the bridge rectifier wave The circuit 2. The EMI suppression circuit and the bridge rectifier chopper circuit 2 have a connection mode JJ and a connection mode 除了 in addition to the above connection method (indicated as connection mode I). In the connection mode π towel, the bridge rectifier filter circuit 2 The input end of the _ _ (Fuse) resistance is connected to the AC power supply, the output is connected to the EMI suppression circuit, the output of the leg suppression circuit is connected to the high-frequency transformer and the power supply circuit 7. In the connection mode in, the mining (4) The wave EMI suppression weave includes capacitance cx, inductance u, electrical a, and inductance L2. The capacitor CX is connected in parallel to the output of the bridge rectifier filter circuit 2, and the inductor L1 and the inductor L2 are connected. The other ends of the inductor L1 and the inductor L2 are respectively connected to the two ends of the capacitor C1. The high voltage terminal of the capacitor C1 is connected to the high frequency transformer τ. Input (If the requirements are not high, the inductor L2 can be omitted to reduce system cost). - In the embodiment shown in Fig. 2, the high frequency transformer τ includes a primary side winding Np, a secondary side winding) Ns, and a feedback winding (auxiliary winding) (10). The high-frequency Wei ^ τ can be used according to the power models: ΕΕ10, ΕΕ13, EFD12.6, EFDI5, ΕΕ16 and so on. In this embodiment, the absorption circuit (RCDsnubber·) is not used, and it is required to withstand the constant high-voltage stress, and the high-frequency transformer 5 M414050 1::==2Γ reduces the stress requirement on the switch tube. The feedback winding of the high-frequency transformer τ is adjacent to the primary side winding, the opening of the feedback stress is = π =: when the opening is reduced, the stress is required, (4) m, in the fourth embodiment (4), the power supply circuit 7 includes Resistor 1u, resistor phantom, diode circuit resistor R1 and resistor phantom series high voltage start-up circuit, high-voltage start nl-type rectification filter circuit 2 output, the other end is connected to capacitor C2 and diode-, pole 'diode m's positive connection high-frequency transformer Feedback winding of τ - terminal, capacitor porting module 1C Wei = electric W, dim D1 (four) connected to the LED drive In the embodiment shown in Fig. 2, the sampling feedback circuit 5 includes a resistance rule 5 and a resistance shame. The resistor R5 is connected to the feedback winding of the high-frequency voltage device and the negative terminal of the diode D1 of the power supply circuit 7 is connected to the resistor R6 and the feedback pin of the LED driving module IC circuit 6; one end of the resistor r6 is connected to the resistor R5 and the LED The feedback pin of the driver module IC circuit 6 is grounded at one end. In the embodiment shown in Fig. 2, the high and low voltage compensation circuit 8 includes a resistor inverse 3 and a resistor r4. The resistor R3 is connected to the resistor R1 of the power supply circuit 7 and the series connection point of the resistor, one end is connected to the current detecting pin of the driving module IC f path 6 and the resistor R4, and the connection point of the resistor R4 and the current detecting circuit 3 is connected to the LED driving module 1C. The E pin of circuit 6. In the embodiment shown in Fig. 2, the output DC circuit 4 includes a diode D2 and a capacitor c. The anode of the diode D2 is connected to one end of the secondary winding Ns of the high-frequency transformer τ, the other end of the diode is connected to one end of the capacitor Co and the anode of the load LED, and the other end of the capacitor Co is connected to the secondary winding Ns of the high-frequency transformer T One end and the negative pole of the load LED. In the embodiment shown in FIG. 2, the LED driving module IC circuit 6 is a pulse width modulation (pulw width modulation) chip and a necessary peripheral auxiliary component using a primary side feedback control technique. For example, OB3391 or similar control chip, the chip has a total of eight function pins, respectively: 'Feedback control pin (INV): used to detect the output voltage of the LED driver circuit, connected to the sample feedback circuit 5; ' ' Wafer power supply pin (VDD): used to supply the working voltage to the chip, connected to the power supply circuit 7; current detection pin (CS): used to detect the output current of the LED actuator circuit, and high and low voltage 6 M414050 compensation current 8 Phase connection; two collector pins of the built-in bipolar junction transistor (BJT) of the βθ chip: the collector of the built-in bipolar transistor, connected to the primary winding Np of the high-frequency transformer T; The emitter pin E of the bipolar junction transistor (BJT) is matched with the current detecting pin 'for the inspection 1 LED driver circuit_current, and is connected to the current detecting circuit 3 and the high and low compensation circuit 8; Two wafers grounded (GND): for grounding. Fig. 3 is a schematic diagram showing a coffee driver circuit according to another embodiment of the present creation. Compared with the schematic diagram shown in Fig. 2, the absorption circuit 9 is added to Fig. 3 and Absorption circuit ι〇/, in the embodiment shown in Fig. 3, the absorption circuit 9 includes a resistor phantom, a resistor R8 C3 2 and a diode D3. The four unit devices have two connections I and Π. After the electric 'and ΪΙΓμ are connected in parallel, the output end of the bridge rectifier chopper circuit 2 and the other end of the high-frequency transformer T are connected to the resistor, and the other end of the resistor is connected to the cathode of the diode D3, which has a high positive connection of the second pole (four). The primary winding of the frequency transformer DD = the end of the driving mode circuit 6; u is the resistor R8 and the capacitor c = terminal, and the other terminal is connected - the pole μ ΓΓ the bridge rectifier chopper 2 is thin, 4 is connected to one pole The negative pole of the official residence 3, the positive pole of the diode D3 is connected to the end of the primary winding Νρ and one end of the LED driver module IC circuit 6. The R8 and the diode D3 at the interchangeable position can be interchanged, and in the scheme π, the resistance can be set: for the absorption circuit In the suction switch tube BJT & top tip ^ interchange, there is a certain EMI suppression In the embodiment shown in Fig. 3, the absorption circuit (1) includes a resistor R9 and a C1〇 connected in series and connected in parallel with the diode m to function as a filial piety (10). The function of 1U2, while Fig. 4 shows the flow-by-flow power factor correction circuit C5, diodes D4, D5, D6 and resistor R1 capacitors in the embodiment shown in Fig. 4 according to another embodiment of the present creation. C4 HC4, the output of the positive 2 terminal of the circuit 2, the primary winding of the diode 2 rectifier rectifier filter T (10) 7 M414050 positive pole, the anode of the diode D4 is connected to the ground terminal of the output of the bridge rectifier filter circuit 2, diode D5 The negative terminal is connected to the resistor rh, the other end of the resistor R11 is connected to the capacitor and the anode of the diode 〇6, and the other end of the capacitor C5 is connected to the ground terminal of the output of the bridge rectifier filter circuit 2 and the anode of the diode D4. The flow-by-flow god factor correction circuit improves the god factor (10)' is to increase the alcohol-pass angle of the bridge rectifier chopper circuit 2. When the input AC current is at the peak half, the rectifier bridge Bm can be turned on to avoid the traditional uncontrolled rectifier circuit. Only in the vicinity of the peak of the AC voltage can the "spike and current distortion problem caused by the instantaneous conduction, improve the secret power factor ) value", reduce the total error (Total Harmonic Distortion, THD) 〇

In various embodiments of the present invention, the positions of the EMI suppression circuit 丨 and the bridge rectification filter circuit 2 may be interchanged, as shown in the circuit 丨 2, mainly to suppress EMI considerations. ^ In the embodiment shown in Fig. 3, the absorbing circuit 9 and the absorbing circuit 1 are considered to function as EMI, the built-in switch BJT, and the diode D2, and can be omitted under the condition that the requirements are not high. One or two of the two circuits to save system cost. In summary, the LED driver circuit according to the embodiment of the present invention can be used for the isolated constant current LED driving ’ 'Electric switch, which has low secret cost and small volume, and is particularly suitable for the lamp cup gui〇, E27 and the like. In addition, the present invention overcomes the defects of the prior art and provides an isolated constant current LED driver circuit with high efficiency, high reliability, voltage input range and low system cost, and has a simple circuit, a small unit, a small volume, and a high efficiency. Features. The present invention has been described above with reference to the specific embodiments of the present invention, but it will be understood by those skilled in the art that various modifications, combinations and changes may be made to the specific embodiments without departing from the scope of the appended claims. The spirit and scope of the creation defined by the object. In addition, any signal arrows in the drawings should be considered as illustrative only and not limiting, unless specifically indicated otherwise. Combinations of components or steps will also be considered as already described when the term is foreseen to be unclear. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a led driver circuit according to an embodiment of the present invention; FIG. 2 is a view showing a better understanding of the present embodiment. A schematic diagram of a LED driver circuit according to an embodiment of the present invention. 8 M414050 FIG. 3 is a schematic diagram showing an LED driver circuit according to another embodiment of the present creation; and FIG. 4 is a diagram showing another embodiment according to the present creation. Schematic diagram of the LED driver circuit. [Main component symbol description] 1 EMI suppression circuit 2 bridge rectifier filter circuit 3 current detection circuit 4 output DC circuit 5 sampling feedback circuit 6 LED driver module 1C circuit 7 power supply circuit 8 south low compensation circuit 9 absorption circuit 10 absorption circuit 11 Flow-by-flow power factor correction circuit AC AC power supply BD1 rectifier bridge C1 capacitor C2 capacitor C3 capacitor C4 capacitor C5 capacitor C10 capacitor

Co capacitor CX capacitor D1 diode D2 diode D3 diode D4 diode D5 diode D6 diode L1 inductor L2 inductor

Np primary winding (primary side winding)

Ns secondary winding (secondary winding)

Naux feedback winding R1 resistor R2 resistor R3 resistor R4 resistor R5 resistor R6 resistor R7 resistor R8 resistor R9 resistor R11 resistor RF fuse resistor T high frequency transformer

Claims (1)

M414050 VI: Patent application scope: Light-emitting diode (LED) driver circuit, including electromagnetic interference suppression circuit ϋ n block 轮, turn-out DC circuit, power supply circuit, sampling feedback circuit, 枳 block integrated circuit, and current detection Circuit, and in the middle. _====_Slightly edit, 峨, fine and the bridge type the input end of the bridge rectifier wave circuit and the output of the electromagnetic interference suppression circuit and the output of the high voltage device The human end, the input end of the power supply circuit, and the input end of the driver module integrated circuit are connected; °x D The input end of the high frequency transistor is connected with the output end of the rectification rectifier circuit === ===; the wheel end of the power supply circuit, and the actuator is connected as a phase end to the wheel end of the high frequency transformer, and the wheel end and the input end of the power supply circuit have no bridge type H circuit The output terminal is connected to the input end of the sampling feedback circuit and the input end of the circuit block circuit; the sneak attacker samples the input terminal of the anti-fourth circuit and the power supply circuit The output is connected, the output is led driver module The input end of the body circuit is connected; " the input end of the end block integrated circuit and the output of the bridge rectification wave circuit, the output end of the power supply circuit, the input nctum of the sampling feedback circuit, BIT) The output end is connected to the high light pressure_wheel end; and the electrochemical detection circuit is connected to the input end of the integrated circuit of the LED driver module. The valve 1 is mixed with the drive circuit, and the backlight drive circuit is used to supply power to the thin driver module integrated circuit, and the power supply is fed to detect the (four) driver circuit output voltage, and the sampling reverse current detection a pin for detecting a wheel current of the LED driver circuit, connected to the current detecting M414050 measuring circuit; a chip built-in bipolar junction transistor (BJT) emitter pin connected to the current circuit; The chip has two collector pins of a bipolar junction transistor (BJT) connected to the high frequency variable wheel end; and two crystal moon ground pins for grounding. Please patent scope! The coffee driver circuit of the present invention further includes a high and low _= circuit, wherein the input end of the high and low display circuit is connected to the output end of the hybrid circuit, == the input terminal of the integrated circuit of the LED driver module The LED driver circuit of the first aspect of the present invention, further comprising an under-circuit of the first absorbing winding, wherein the first absorbing circuit spans the primary end of the high-frequency medulla ^ Both ends of the second absorption circuit straddle the output rectifier of the DC output circuit in the two ^ according to the scope of the patent application! The LED driver circuit described in the item, the center bridge rectifier circuit is connected at the output end: the wheel output circuit, and the current detection circuit m (4) the smash block output terminal ===: wire power _ power source connection, rotation The input end of the circuit is connected to the output end of the bridge rectifier wave circuit and the driver module integrated circuit is connected to the input end of the power supply circuit, and the LED end is connected to the wheel end of the module integrated circuit; the power supply circuit The wheel is informed, and the LED actuator is used as the == lamp: the C terminal is connected to the output of the high frequency transformer, the output is connected to the output of the 11 M414050 wheel ===_interference suppression circuit and the high _ product The input terminal of the body circuit is connected; the input terminal of the t-type feedback circuit of the human terminal is connected with the input end of the integrated circuit of the LED driver module of the power supply circuit; The output end of the LED flashing module integrated circuit and the electromagnetic interference suppression circuit, the frequency of the output of the power supply circuit, the output of the power supply circuit, the sampling feedback circuit = the output phase == detection The output ends of the circuit are connected, and the output end is connected to the input end of the high frequency transformer and the input end of the LED driving sled integrated circuit. Magnetic, according to the towel, please _ 6 lion's LED drive circuit, its betel block integrated circuit includes: hacking B-day chip power supply pin, used to supply the LED driver module integrated circuit for the output phase of the circuit a feedback control pin 'for detecting an output voltage of the LED driver circuit and connected to an output end of the sampling feedback circuit; a current detecting pin for detecting an output current of the LED driver circuit, and the high and low voltage compensation The circuit is connected; the emitter pin of the bipolar junction transistor is connected to the current detecting circuit; the two collector pins of the bipolar junction transistor are embedded in the chip, and the primary winding of the high frequency transformer Connected; and two wafer ground pins for grounding. The LED driver circuit of claim 2, further comprising a high and low voltage compensation circuit, wherein an input end of the high and low voltage compensation circuit is connected to an output end of the power supply circuit, and the wheel terminal and the LED driver An input of the module integrated circuit is coupled to an input of the current detecting circuit. 9. The LED driver circuit of claim 6, further comprising a first absorption circuit and/or a second absorption circuit 'where the first absorption circuit spans both ends of the primary winding of the high frequency transformer The second absorption circuit spans both ends of the output rectifying device of the output DC circuit. 0 12 = The LED power factor correction circuit according to claim 6 of the patent application, the input terminal and the electric path, The method further includes connecting the flow-out terminal to the input end of the power supply circuit, and the output end of the bottom circuit is connected to the 'interference interference suppression circuit. Magnetic interference suppression circuit is PI type filter electromagnetic 13