CN205356734U - Light -emitting diode (LED) lighting equipment - Google Patents

Abstract

The utility model discloses a lighting device, which comprises a base, a support rod, a lampshade, an LED drive circuit and an LED load, wherein the support rod has flexibility, the LED load is arranged on the top of the support rod, and the LED drive circuit includes commercial power, The rectification and filtering circuit, the driving circuit, the output circuit and the feedback circuit are characterized in that they also include a regulating circuit, which is connected between the rectifying and filtering circuit and the driving circuit, through which the LED light caused by the direct connection between the rectifying and filtering circuit and the driving circuit can be eliminated. Strobe problem.

Description

A kind of LED lighting equipment

technical field

The utility model relates to the lighting field, in particular to an LED lighting device.

Background technique

With the development of science and technology, LED, as a new type of light source, has the advantages of small size, low power consumption, high light efficiency, long life, environmental protection, etc., and is widely used in the field of lighting, and various LEDs have appeared Driving circuit, in practical applications, the use of different LED driving circuits will have an impact on luminous efficiency and life.

At present, among many ways of driving LEDs, some use rectification and filtering circuits to directly connect with LED driving circuits to achieve efficient driving of LEDs. However, there are defects such as LED load flickering, easy damage, and strong high-frequency interference. caused inconvenience. In the application, the LED driving circuit needs to eliminate the stroboscopic problem caused by LED driving as much as possible.

Utility model content

In order to solve the above problems, the purpose of the utility model is to provide an LED lighting device that can eliminate the stroboscopic problem caused by LED driving.

The utility model provides an LED lighting device, which comprises a lamp holder, a support rod, a lampshade, an LED drive circuit and an LED load, wherein the support rod has flexibility, the LED load is arranged on the top of the support rod, and the LED drive circuit includes commercial power, The rectifying and filtering circuit, the driving circuit, the output circuit and the feedback circuit are characterized in that they also include a regulating circuit connected between the rectifying and filtering circuit and the driving circuit, wherein the rectifying and filtering circuit includes piezoresistor R1, inductor L1, inductor L2, resistor R2, resistor R3, capacitor C1, rectifier circuit, one end of inductor L1 and one end of inductor L2 are respectively connected to live wire L and neutral wire N of mains power (1), and the other end of inductor L1 and the other end of inductor L2 are connected to rectifier circuit At the input end, the resistor R2 and the resistor R3 are connected in parallel to the two ends of the inductor L1 and the inductor L2 respectively.

Further, the above-mentioned rectification circuit is a full-bridge rectification circuit.

Further, the drive circuit includes inductor L3, diode D2, Zener diode D3, diode D4, Zener diode D5, diode D6, diode D7, transformer T, triode Q3, MOS transistor Q4, driver chip U1, wherein one end of the inductor L3 Connect to the positive output terminal of the rectifier circuit, the other end is connected to the voltage input terminal VCC of the driver chip U1 through the diode D4 and the resistor R14, and the other end of the inductor L3 is connected to the output terminal DRV of the driver chip U1 through the primary winding of the transformer T and the diode D7 , the resistor R8 and the resistor R9 are connected in series between the other end of the inductor L3 and the collector of the transistor Q3, the collector of the transistor Q3 is connected to the negative output terminal of the rectifier and filter circuit after the adjustment circuit, the connection point of the resistor R8 and the resistor R9 Connect the anode of the diode D2 and the base of the transistor Q3, the other end of the diode D2 is respectively connected to the emitter of the transistor Q3, one end of the capacitor C2, one end of the resistor R10, the other end of the capacitor C2 is connected to the collector of the transistor Q3, and the resistor R10 The other end is connected to the gate of the MOS transistor Q4, the source of the MOS transistor Q4 is connected to the collector of the transistor Q3, the drain of the MOS transistor Q4 is connected to the collector of the transistor Q3 through the resistor R11, and the anode of the Zener diode D5 is connected to the inductor L3 At the other end, the cathode of the Zener diode D5 is connected to the cathode of the diode D6, and the anode of the diode D6 is connected to the output terminal DRV of the driver chip U1 after passing through the diode D7. The driver chip U1 includes a field effect transistor, wherein the drain of the field effect transistor As the output of the driving chip U1, the source of the field effect transistor is connected to the drain of the MOS transistor Q4.

Further, the output circuit includes a Zener diode D8, a capacitor C6 and a resistor R15. The anode of the Zener diode D8 is connected to the positive end of the secondary winding of the transformer T, and the cathode of the Zener diode D8 is connected to the secondary winding of the transformer T after passing through the LED string. negative terminal.

Further, the feedback circuit includes a diode D9, an inductor L4, a three-terminal regulator TL431, a photocoupler OC, the anode of the diode D9 is connected to the positive end of the auxiliary winding of the transformer T, and the cathode of the diode D9 passes through the inductor L4, the resistor R18, and the resistor R19 Then connect the anode of the three-terminal voltage regulator TL431, the reference pole of the three-terminal voltage regulator TL431 is connected to the connection point of resistors R18 and R19, the cathode of the three-terminal voltage regulator TL431 is connected to the cathode of the diode D9 through the resistor R17, the photocoupler The anode of the emission tube in the OC is connected to the cathode of the diode D9 through the resistor R16, the cathode of the emission tube is connected to the cathode of the three-terminal voltage regulator TL431, the collector of the phototransistor in the photocoupler OC is connected to the feedback terminal FB of the driver chip U1, and the photoelectric coupling The emitter of the phototransistor in the device OC is connected to the source of the field effect transistor of the driving chip U1.

Further, the regulating circuit includes a MOS transistor Q1, a resistor R4, a resistor R5, a resistor R6, and a triode Q2, wherein the drain of the MOS transistor Q1 is connected to the positive output terminal of the rectifier circuit, and the source of the MOS transistor Q1 is connected to the rectifier circuit after passing through the resistor R4 One end of the resistor R5 is connected to the positive output end of the rectifier circuit, the other end of the resistor R5 is connected to the gate of the MOS transistor Q1 and the collector of the transistor Q2, and the emitter of the transistor Q2 is connected to the negative output of the rectifier circuit terminal, the base of the triode Q2 is connected to the negative output terminal of the rectifier circuit through the resistor R6 and the resistor R7, the regulator tube D1 is connected between the gate of the MOS transistor Q1 and the negative output terminal of the rectifier circuit, the resistor R6 and the resistor R7 The connection point is connected with the collector of the triode Q3 in the driving circuit.

The utility model adds a regulating circuit between the rectifying and filtering circuit and the driving circuit, so that the output voltage and current are stable, thereby eliminating the flicker caused by the LED driving.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a circuit structure diagram of the driving circuit of the utility model.

detailed description

The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

This embodiment provides an LED lighting device, which includes a lamp holder, a pole, a lampshade, an LED driving circuit and an LED load, wherein the pole is stretchable, and the LED load is arranged on the top of the pole.

As shown in Figure 1, the LED driving circuit includes a commercial power supply 1, a rectifying and filtering circuit 2, a driving circuit 3, an output circuit 4 and a feedback circuit 5, and is characterized in that it also includes a regulating circuit 6, which is connected to the rectifying and filtering circuit 2 and the driving circuit. between 3.

Fig. 2 shows the detailed circuit structure of the utility model LED driving circuit, specifically:

The rectification filter circuit 2 includes a piezoresistor R1, an inductor L1, an inductor L2, a resistor R2, a resistor R3, a capacitor C1, and a rectifier circuit. One end of the inductor L1 and one end of the inductor L2 are respectively connected to the live line L and the neutral line N of the mains 1, The other end of the inductance L1 and the other end of the inductance L2 are connected to the input end of the rectification circuit, and the resistors R2 and R3 are respectively connected in parallel to the two ends of the inductance L1 and the inductance L2. The rectification circuit is a full-bridge rectification circuit.

The regulating circuit 6 includes a MOS transistor Q1, a resistor R4, a resistor R5, a resistor R6, and a triode Q2, wherein the drain of the MOS transistor Q1 is connected to the positive output terminal of the rectifier circuit, and the source of the MOS transistor Q1 is connected to the positive output terminal of the rectifier circuit after passing through the resistor R4. The negative output terminal of the output terminal, one terminal of the resistor R5 is connected to the positive output terminal of the rectifier circuit, the other terminal of the resistor R5 is connected to the gate of the MOS transistor Q1 and the collector of the transistor Q2, and the emitter of the transistor Q2 is connected to the negative output terminal of the rectifier circuit, The base of the transistor Q2 is connected to the negative output terminal of the rectifier circuit through the resistor R6 and the resistor R7, and the regulator D1 is connected between the gate of the MOS transistor Q1 and the negative output terminal of the rectifier circuit, and the connection point of the resistor R6 and the resistor R7 It is connected with the collector of the triode Q3 in the driving circuit 3 .

The drive circuit 3 includes an inductor L3, a diode D2, a voltage regulator diode D3, a diode D4, a voltage regulator diode D5, a diode D6, a diode D7, a transformer T, a triode Q3, a MOS transistor Q4, and a driver chip U1, wherein one end of the inductor L3 is connected to a rectifier The positive output terminal of the circuit, the other end is connected to the voltage input terminal VCC of the driver chip U1 after the diode D4 and the resistor R14, the other end of the inductor L3 is connected to the output terminal DRV of the driver chip U1 after the primary winding of the transformer T, the diode D7, and the resistor R8 and resistor R9 are connected in series between the other end of inductor L3 and the collector of transistor Q3. The collector of transistor Q3 is connected to the negative output terminal of rectifier and filter circuit 2 after adjusting circuit 6. The connection point of resistor R8 and resistor R9 Connect the anode of the diode D2 and the base of the transistor Q3, the other end of the diode D2 is respectively connected to the emitter of the transistor Q3, one end of the capacitor C2, one end of the resistor R10, the other end of the capacitor C2 is connected to the collector of the transistor Q3, and the resistor R10 The other end is connected to the gate of the MOS transistor Q4, the source of the MOS transistor Q4 is connected to the collector of the transistor Q3, the drain of the MOS transistor Q4 is connected to the collector of the transistor Q3 through the resistor R11, and the anode of the Zener diode D5 is connected to the inductor L3 At the other end, the cathode of the Zener diode D5 is connected to the cathode of the diode D6, and the anode of the diode D6 is connected to the output terminal DRV of the driver chip U1 after passing through the diode D7. The driver chip U1 includes a field effect transistor, wherein the drain of the field effect transistor As the output of the driving chip U1, the source of the field effect transistor is connected to the drain of the MOS transistor Q4.

The output circuit 4 includes a Zener diode D8, a capacitor C6 and a resistor R15. The anode of the Zener diode D8 is connected to the positive end of the secondary winding of the transformer T, and the cathode of the Zener diode D8 is connected to the negative end of the secondary winding of the transformer T after passing through the LED string. .

The feedback circuit 5 includes a diode D9, an inductor L4, a three-terminal regulator TL431, and a photocoupler OC. The anode of the diode D9 is connected to the positive terminal of the auxiliary winding of the transformer T, and the cathode of the diode D9 is connected to The anode of the three-terminal voltage regulator TL431, the reference electrode of the three-terminal voltage regulator TL431 is connected to the connection point of resistors R18 and R19, the cathode of the three-terminal voltage regulator TL431 is connected to the cathode of the diode D9 through the resistor R17, and the photocoupler OC The anode of the emission tube is connected to the cathode of the diode D9 through the resistor R16, the cathode of the emission tube is connected to the cathode of the three-terminal voltage regulator TL431, the collector of the phototransistor in the photocoupler OC is connected to the feedback terminal FB of the driver chip U1, and the photocoupler OC The emitter of the middle phototransistor is connected to the source of the field effect transistor of the driving chip U1.

Since the adjustment circuit 6 is added between the rectification filter circuit 2 and the drive circuit 3, the adjustment circuit 6 senses the output voltage through the resistor R6, thereby controlling the turn-on and turn-off of the transistor Q2, and the turn-on and turn-off of the transistor Q2 further controls the MOS The turn-on and turn-off of the tube Q1 adjusts the output of the circuit through the turn-on and turn-off of the MOS tube, and the Zener diode R4 protects the MOS tube Q1. The addition of the regulating circuit 6 can eliminate the LED load stroboscopic problem caused when the rectifying and filtering circuit 2 is directly connected to the driving circuit 3 .

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Within, the modifications made should be included in the protection scope of the present utility model.

Claims (7)

1. a LED illumination device, it is characterized in that: include lamp socket, strut, lampshade, LED drive circuit and LED load, wherein strut has retractility, LED load is arranged on the top of strut, LED drive circuit includes civil power (1), current rectifying and wave filtering circuit (2), drive circuit (3), output circuit (4) and feedback circuit (5), also include regulating circuit (6), it is connected between current rectifying and wave filtering circuit (2) and drive circuit (3), wherein current rectifying and wave filtering circuit (2) includes varistor R1, inductance L1, inductance L2, resistance R2, resistance R3, electric capacity C1, rectification circuit, one end of inductance L1, one end of inductance L2 connects the live wire L and zero line N of civil power (1) respectively, the other end of inductance L1, the input of another termination rectification circuit of inductance L2, resistance R2 and resistance R3 is connected to inductance L1 and the two ends of inductance L2 respectively.

2. a kind of LED illumination device according to claim 1, it is characterised in that the rectification circuit in described current rectifying and wave filtering circuit (2) is full bridge rectifier.

3. a kind of LED illumination device according to claim 1, it is characterized in that, described drive circuit (3) includes inductance L3, diode D2, Zener diode D3, diode D4, Zener diode D5, diode D6, diode D7, transformator T, audion Q3, metal-oxide-semiconductor Q4, driving chip U1, the wherein positive output end of a termination rectification circuit of inductance L3, the other end is through diode D4, resistance R14 is followed by the voltage input end VCC of driving chip U1, the other end of inductance L3 is through the armature winding of transformator T, diode D7 is followed by the outfan DRV of driving chip U1, resistance R8 and resistance R9 connects and is followed by between the other end and the colelctor electrode of audion Q3 of inductance L3, the colelctor electrode of audion Q3 is adjusted circuit (6) and is followed by the negative output terminal of current rectifying and wave filtering circuit (2), the junction point of resistance R8 and resistance R9 connects the positive pole of diode D2 and the base stage of audion Q3, the other end of diode D2 connects the emitting stage of audion Q3 respectively, one end of electric capacity C2, one end of resistance R10, the colelctor electrode of another termination audion Q3 of electric capacity C2, the grid of another termination metal-oxide-semiconductor Q4 of resistance R10, the source electrode of metal-oxide-semiconductor Q4 connects the colelctor electrode of audion Q3, the drain electrode of metal-oxide-semiconductor Q4 is followed by the colelctor electrode of audion Q3 through resistance R11, the anode of Zener diode D5 connects the other end of inductance L3, the negative electrode of Zener diode D5 connects the negative electrode of diode D6, the anode of diode D6 is followed by the outfan DRV of driving chip U1 through diode D7.

4. a kind of LED illumination device according to claim 3, it is characterised in that: described driving chip U1 includes field effect transistor, and wherein the drain electrode of field effect transistor is as the output of driving chip U1, and the source electrode of field effect transistor connects the drain electrode of metal-oxide-semiconductor Q4.

5. according to a kind of LED illumination device one of Claims 1-4 Suo Shu, it is characterized in that, described output circuit (4) includes Zener diode D8, electric capacity C6 and resistance R15, the anode of Zener diode D8 connects the anode of transformator T secondary windings, and the negative electrode of Zener diode D8 is followed by the negative terminal of transformator T secondary windings through LED strip.

6. a kind of LED illumination device according to claim 5, it is characterized in that, described feedback circuit (5) includes diode D9, inductance L4, three terminal regulator TL431, photoelectrical coupler OC, the anode of diode D9 connects the auxiliary winding anode of transformator T, the negative electrode of diode D9 is through inductance L4, resistance R18, resistance R19 is followed by the anode of three terminal regulator TL431, the junction point of reference pole connecting resistance R18 and the R19 of three terminal regulator TL431, the negative electrode of three terminal regulator TL431 is connected through the negative electrode of resistance R17 with diode D9, in photoelectrical coupler OC, the anode of transmitting tube connects the negative electrode of diode D9 through resistance R16, the negative electrode of transmitting tube connects the negative electrode of three terminal regulator TL431, in photoelectrical coupler OC, the colelctor electrode of phototriode meets the feedback end FB of driving chip U1, in photoelectrical coupler OC, the emitter stage of phototriode connects field effect transistor source electrode in driving chip U1.

7. a kind of LED illumination device according to claim 3, it is characterized in that, described adjustment circuit (6) includes metal-oxide-semiconductor Q1, resistance R4, resistance R5, resistance R6, audion Q2, wherein the drain electrode of metal-oxide-semiconductor Q1 connects the positive output end of rectification circuit, the source electrode of metal-oxide-semiconductor Q1 is followed by the positive output end negative output terminal of rectification circuit through resistance R4, the positive output end of the one termination rectification circuit of resistance R5, the grid of another termination metal-oxide-semiconductor Q1 of resistance R5 and the colelctor electrode of audion Q2, the emitting stage of audion Q2 connects the negative output terminal of rectification circuit, the base stage of audion Q2 is through resistance R6, resistance R7 is followed by the negative output terminal of rectification circuit, stabilivolt D1 is connected between grid and the negative output terminal of rectification circuit of metal-oxide-semiconductor Q1, resistance R6, the junction point of resistance R7 is connected with audion Q3 colelctor electrode in drive circuit (3).