LED line lamp for outdoor lighting

Abstract

The utility model relates to the technical field of lighting lamps, and discloses an LED line lamp for outdoor lighting in order to solve the technical problem that a power factor and cost of an existing line lamp drive circuit are difficult to balance, a drive end of a PWM controller U1 is connected with a base electrode of an NMOS tube Q5, a source electrode of the NMOS tube Q5 is grounded through a sampling resistor, and the source electrode of the NMOS tube Q5 is grounded through the sampling resistor. The drain electrode of the NMOS tube Q5 is connected with the positive electrode output end of the rectification filter circuit through a fly-wheel diode D6. A PFC circuit is arranged between the rectification filter circuit and the voltage reduction and stabilization circuit, the PFC circuit comprises a diode D4 and a diode D5, the cathode of the diode D5 is connected with the anode output end of the rectification filter circuit, the cathode of the diode D4 is connected with the anode output end of the rectification filter circuit through a capacitor C2, the anode of the diode D4 is grounded, and the cathode of the diode D4 is grounded. The anode of the diode D5 is grounded through a capacitor C4, and the cathode of the diode D4 is connected with the anode of the diode D5 through a diode D1 and a resistor R1 in sequence.

Description

TECHNICAL FIELD

[0001] The utility model relates to lighting lamps and lanterns technical field especially relates to a kind of LED line lamp for outdoor brightening. BACKGROUND

[0002] LED line lamp is a kind of high-efficiency energy-saving lighting equipment with decorative and functional, because of its high brightness, long life, strong anti-interference ability, diversified brightening effect and other advantages, it is widely used in bridge, building contour, park landscape and other outdoor brightening engineering.However, with the continuous expansion of application scene, LED line lamp in stability, reliability and the energy efficiency design of drive circuit, faces higher technical requirements and challenges.

[0003] In practical application, the power factor of most traditional LED drive circuits is relatively low.The reduction of power factor not only increases the burden of electrical equipment on power grid, but also leads to higher harmonic interference.Harmonic interference may cause power grid equipment failure on one hand, and also significantly reduces the energy utilization efficiency of the whole power grid.This phenomenon is particularly evident in the scene of large-scale use of LED line lamp.

[0004] The design of drive circuit needs to find a balance between cost and performance, on the one hand, high-performance drive circuit design usually accompanied by higher research and production cost, which will significantly increase the engineering budget in large-scale application;On the other hand, due to cost considerations, the selection of low-performance drive scheme may also lead to lower energy efficiency of the lamp, further increasing the energy consumption and maintenance cost in long-term operation.

[0005] At the same time, the drive circuit of LED line lamp also needs to cope with a variety of adverse factors in outdoor environment.For example, high temperature, humidity or electromagnetic interference and other harsh conditions may lead to the performance degradation of drive circuit components, and even damage the whole lamp equipment.

[0006] How to effectively improve power factor, reduce harmonic interference, balance cost and performance, and improve the anti-interference ability and environmental adaptability of the circuit is a problem to be solved. INVENTION CONTENTS

[0007] The utility model aims at providing a kind of LED line lamp for outdoor brightening to solve the technical problem that the power factor and cost of existing line lamp drive circuit are difficult to balance.

[0008] To achieve the above object, the utility model provides a kind of LED line lamp for outdoor brightening, including alternating current input line, rectifier filter circuit and voltage reduction voltage stabilizing circuit, the driving end of PWM controller U1 is connected with the base of NMOS tube Q5, the source of NMOS tube Q5 is connected with ground through sampling resistance, the drain of NMOS tube Q5 is connected with the positive output end of rectifier filter circuit through freewheeling diode D6;PFC circuit is arranged between rectifier filter circuit and voltage reduction voltage stabilizing circuit, PFC circuit includes diode D4 and diode D5, the cathode of diode D5 is connected with the positive output end of rectifier filter circuit, the cathode of diode D4 is connected with the positive output end of rectifier filter circuit through capacitor C2, the anode of diode D4 is grounded, the anode of diode D5 is grounded through capacitor C4, the cathode of diode D4 is connected with the anode of diode D5 in proper order through diode D1 and resistance R1.

[0009] Further, the current sampling end of PWM controller U1 is connected with the source of NMOS tube Q5, the linear light adjustment input end of PWM controller U1 is grounded in proper order through adjustable resistance CW and resistance R9, and the switch tube Q1 for supplying power to PWM controller U1 is further provided.

[0010] Further, the switch tube Q1 is NPN triode, the power input end of PWM controller U1 is connected with the emitter of switch tube Q1, the collector of switch tube Q1 is connected with the positive output end of rectifier filter circuit through resistance R4, and the base of switch tube Q1 is provided with bias circuit for making switch tube Q1 work in saturation state.

[0011] Further, the bias circuit includes stabilizing tube Z2, the anode of stabilizing tube Z2 is grounded, the cathode of stabilizing tube Z2 is connected with the base of switch tube Q1, the base of switch tube Q1 is connected with the positive output end of rectifier filter circuit through pull-up resistance, and capacitor C5 is further connected in parallel across stabilizing tube Z2.

[0012] Further, EMC circuit is further provided in the front pole of rectifier filter circuit, including thermistor CVR, safety tube F1, inductance L2 and inductance L3 connected in series in alternating current input line, thermistor CVR and inductance L2 are connected in series in zero line N in proper order, safety tube F1 and inductance L3 are connected in series in phase line L in proper order, and X capacitor C1 is further connected in parallel between alternating current input line.

[0013] The utility model provides a kind of LED line lamp for outdoor brightening has the following advantages:

[0014] The utility model discloses a rectifier filter circuit and voltage reduction and voltage stabilization circuit between introduction optimization design's PFC circuit, effectively solved the present LED line lamp drive circuit in power factor and cost between the difficult balancing technical problem of the present LED line lamp drive circuit, PFC circuit adopts the series structure of diode D4 and D5, combines the layout design of capacitor C2 and C4, formed the high -efficient power factor correction mechanism, wherein, the cathode of diode D4 is connected with rectifier filter circuit anode output end through capacitor C2, and its anode is grounded simultaneously, can stabilize input voltage and reduce current fluctuation, the cathode of diode D5 is connected with rectifier filter circuit's anode output end, and the anode is grounded through capacitor C4, and it is helpful to optimize the shaping effect, the cathode of diode D4 is connected with the anode of diode D5 through diode D1 and resistance R1, further restricts the current amplitude, reduces harmonic component, thereby significantly improves power factor, reduces energy consumption and circuit loss simultaneously, rectifier filter circuit provides pure DC for PFC circuit through the combination design of rectifier stack and filter capacitor, and voltage reduction and voltage stabilization circuit is through the accurate control of PWM controller U1 and NMOS pipe Q5, further ensures the stability of output current and drive efficiency, this design not only realizes high -performance power factor correction and electric energy utilization rate optimization through reasonable component collocation, but also simplifies the component quantity on structure, effectively reduces production and maintenance cost, finally achieves the optimization balance between power factor promotion and cost control. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 The EMC circuit and rectifier filter circuit of the lamp provided by the utility model are shown in the drawings.

[0016] Fig. 2 The PFC circuit diagram of the lamp provided by the utility model is shown in the drawings.

[0017] Fig. 3 The voltage reduction and voltage stabilization circuit diagram of the lamp provided by the utility model is shown in the drawings. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the utility model is further explained in detail below by combining with the drawings and examples. It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0019] Referring to Figs. 1 to 3 The utility model provides a kind of LED line lamp for outdoor brightening, including EMC circuit, rectifier filter circuit, PFC circuit and voltage reduction and voltage stabilization circuit.

[0020] Referring to Fig. 1The EMC circuit comprises a thermistor CVR, a fuse F1, an inductor L2 and an inductor L3 connected in series in the AC input circuit, wherein the thermistor CVR and the inductor L2 are connected in series in the zero line N, the fuse F1 and the inductor L3 are connected in series in the phase line L, and an X capacitor C1 is connected in parallel between the AC input circuit.

[0021] Specifically, a first end of the thermistor CVR is connected to a zero line N port, a second end of the thermistor CVR is connected to a second end of the inductor L2, a first end of the inductor L2 is connected to a first input end of the rectifier filter circuit; a first end of the fuse F1 is connected to a phase line L port, a second end of the fuse F1 is connected to a second end of the inductor L3, a first end of the inductor L3 is connected to a second input end of the rectifier filter circuit; two ends of the X capacitor C1 are connected to the second end of the inductor L2 and the second end of the inductor L3 respectively.

[0022] The rectifier filter circuit comprises a rectifier stack composed of four diodes, two input ends of the rectifier stack are connected to output ends of the EMC circuit, a positive output end of the rectifier stack is used for outputting a positive pole of a direct current power supply and is connected to an input end of the PFC circuit, a negative output end of the rectifier stack is grounded, the positive output end of the rectifier stack outputs a first direct current DC, and a capacitor C3 for filtering is connected between the positive output end and the negative output end of the rectifier stack.

[0023] The design can effectively suppress high-frequency interference and inrush current and significantly improve the anti-electromagnetic interference capability and stability of the circuit by arranging the EMC circuit composed of the thermistor, the fuse, the inductors and the X capacitor in the AC input circuit; the introduction of the thermistor can limit the inrush current at the start time and protect the subsequent circuit elements from impact; the configuration of the fuse provides an overcurrent protection function and effectively improves the safety of the circuit; the series-connected inductors L2 and L3 can further weaken the high-frequency noise in the power line and ensure the purity of the input signal, and the parallel structure of the X capacitor can reduce the differential mode interference and improve the power supply quality. The combination of the four-diode rectifier stack and the filtering capacitor in the rectifier filter circuit not only realizes efficient conversion of AC to DC, but also effectively reduces the ripple voltage of the DC output through the filtering capacitor C3, further improves the stability of the output power supply, provides high-quality electrical energy input for the subsequent PFC circuit, and thus guarantees the reliability and operating efficiency of the entire LED driving circuit.

[0024] Reference is made to Fig. 2, the PFC circuit includes diode D1, diode D4, diode D5, capacitor C2, capacitor C4 and resistor R1, diode D4 and capacitor C2 are connected in series, diode D5 and capacitor C4 are connected in series, the anode of diode D4 and the first end of capacitor C4 are grounded, the cathode of diode D4 is connected with the first end of capacitor C2, the second end of capacitor C2 and the cathode of diode D5 are respectively connected with the positive output end of the rectifier stack, the second end of capacitor C4 is connected with the anode of diode D5, the anode of diode D1 is connected with the cathode of diode D4, and the cathode of diode D1 is connected with the anode of diode D5 through resistor R1. The PFC circuit improves the power factor and reduces the harmonic interference, thereby improving the power utilization efficiency and the circuit stability.

[0025] The PFC circuit realizes high-efficiency power factor correction function through the combination design of diodes, capacitors and resistors, effectively reduces the harmonic components of the input current and improves the power factor, thereby improving the energy efficiency performance of the whole circuit; the branch formed by diode D4 and capacitor C2 can stabilize the input voltage and alleviate the current fluctuation, and the current shaping effect is further optimized through the branch of diode D5 and capacitor C4 in series; the anode of diode D1 is connected with the cathode of diode D4, which helps to quickly turn on and reduce power consumption, and its cathode is connected with the anode of diode D5 through resistor R1, which can effectively limit the current and prevent overload, thereby protecting the circuit and improving the operation stability; the overall design not only has simple structure and low cost, but also has the advantages of high efficiency and high reliability, thereby providing stable input voltage and current support for the subsequent voltage reduction and stabilization circuit.

[0026] Referring to Fig. 3 The voltage reduction and stabilization circuit includes PWM controller U1, NMOS tube Q5 and triode Q1, the first end of PWM controller U1 is a ground end and is directly grounded; the second end of PWM controller U1 is a current sampling end; the third end of PWM controller U1 is a linear dimming input end and is grounded through adjustable resistor CW and resistor R9 in sequence; the fourth end of PWM controller U1 is an oscillation resistor input end and is grounded through resistor R8; the fifth end of PWM controller U1 is an over-temperature protection setting end and is vacant in the embodiment; the sixth end of PWM controller U1 is a dimming input end and is vacant in the embodiment; the seventh end of PWM controller U1 is a power supply input end;

[0027] The eighth end of the PWM controller U1 is a driving end, which is connected with the gate of the NMOS tube Q5, the source of the NMOS tube Q5 is grounded through a plurality of sampling resistors (a power supply R5, a resistor R6 and a resistor R7) and is connected with the current sampling end of the PWM controller U1, the drain of the NMOS tube Q5 is connected with the second end of the ballast inductor L1 through a freewheeling diode D6 and the positive output end of the rectifier stack, and the drain of the NMOS tube Q5 is connected with the first end of the ballast inductor L1, which is used as a negative electrode for supplying power to the LED.

[0028] The switch tube Q1 for supplying power to the PWM controller U1 is arranged, the switch tube Q1 is an NPN type triode, the emitter of the switch tube Q1 is connected with the power input end of the PWM controller U1, the collector of the switch tube Q1 is connected with the positive output end of the rectifier stack through the resistor R4, the base of the switch tube Q1 is connected with the positive output end of the rectifier stack through the resistor R2 and the resistor R3 connected in series, and the base of the switch tube Q1 is grounded through the stabilizing tube Z2.

[0029] Specifically, the drain of the NMOS tube Q5 is connected with the anode of the freewheeling diode D6, the cathode of the freewheeling diode D6 is connected with the positive output end of the rectifier stack, the first end of the ballast inductor L1 is connected with the cathode of the freewheeling diode D6, the cathode of the stabilizing tube Z2 is connected with the base of the switch tube Q1, the anode of the stabilizing tube Z2 is grounded, the stabilizing tube Z2 is also connected with the capacitor C5 in parallel, and the emitter of the switch tube Q1 is grounded through the two associated capacitors C6 and C7.

[0030] The buck voltage stabilizing circuit realizes efficient and stable voltage conversion and output regulation through the cooperation of the PWM controller U1, the NMOS tube Q5, the triode Q1 and related elements, the PWM controller U1 precisely controls the switching state of the NMOS tube Q5 through the feedback regulation of the current sampling end and the oscillation resistance end, thereby realizing efficient regulation and voltage stabilization of the output current, the NMOS tube Q5, the freewheeling diode D6, the ballast inductor L1 and the filter capacitor C8 work cooperatively, thereby effectively reducing voltage ripple and improving the stability of the output power supply, ensuring the long-term reliable operation of the LED lamp, the supply design of the switch tube Q1 and the stabilizing tube Z2 avoids the influence of input voltage fluctuation on the PWM controller U1, thereby further improving the reliability of the system, in addition, the combination of a plurality of sampling resistors and grounding capacitors enhances the anti-interference ability and output precision of the circuit, so that the circuit can adapt to different power requirements and reduce power consumption, thereby providing high-quality and stable power supply for the LED lamp.

[0031] The LED line lamp provided by the utility model has the following advantages:

[0032] By integrating EMC circuit, rectification filter circuit, PFC circuit and step-down voltage stabilizing circuit, a high-efficiency, stable and reliable driving system is formed; EMC circuit adopts the combination design of thermistor, safety tube, inductor and X capacitor, which can effectively suppress high-frequency interference and inrush current, significantly improve the anti-electromagnetic interference ability and safety of the circuit, and provide pure input signal for the subsequent circuit; PFC circuit adopts multi-stage diode, capacitor and resistor design, which effectively reduces harmonic components, improves power factor and energy efficiency performance, optimizes input current shaping effect, reduces power consumption and enhances overall circuit stability; Step-down voltage stabilizing circuit realizes efficient regulation of output current and stable power supply through precise cooperation of PWM controller, NMOS tube, freewheeling diode and ballast inductor, and improves the adaptability of the circuit to input voltage fluctuation through the design of switching tube and voltage stabilizing tube, further enhances the anti-interference ability and reliability.

[0033] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An LED line light fixture for outdoor lighting, comprising an AC input line, a rectification and filtering circuit and a step-down and voltage-stabilizing circuit, characterized in that, The driving end of the PWM controller U1 is connected with the base of the NMOS tube Q5, the source of the NMOS tube Q5 is connected with the ground through a sampling resistor, and the drain of the NMOS tube Q5 is connected with the positive output end of the rectification filtering circuit through a freewheeling diode D6; a PFC circuit is arranged between the rectification filtering circuit and the voltage reduction and stabilization circuit, the PFC circuit comprises a diode D4 and a diode D5, the cathode of the diode D5 is connected with the positive output end of the rectification filtering circuit, the cathode of the diode D4 is connected with the positive output end of the rectification filtering circuit through a capacitor C2, the anode of the diode D4 is grounded, the anode of the diode D5 is grounded through a capacitor C4, and the cathode of the diode D4 is connected with the anode of the diode D5 in sequence through a diode D1 and a resistor R1.

2. The LED lineal luminaire for outdoor lighting according to claim 1, wherein, The current sampling end of the PWM controller U1 is connected with the source of the NMOS tube Q5, the linear dimming input end of the PWM controller U1 is grounded in sequence through an adjustable resistor CW and a resistor R9, and a switching tube Q1 for supplying power to the PWM controller U1 is further arranged.

3. The LED lineal luminaire for outdoor lighting according to claim 2, wherein, The switching tube Q1 is an NPN type triode, the power supply input end of the PWM controller U1 is connected with the emitter of the switching tube Q1, the collector of the switching tube Q1 is connected with the positive output end of the rectification filtering circuit through a resistor R4, and the base of the switching tube Q1 is provided with a bias circuit for making the switching tube Q1 work in a saturation state.

4. The LED lineal luminaire for outdoor lighting according to claim 3, wherein, The bias circuit comprises a stabilizing tube Z2, the anode of the stabilizing tube Z2 is grounded, the cathode of the stabilizing tube Z2 is connected with the base of the switching tube Q1, the base of the switching tube Q1 is connected with the positive output end of the rectification filtering circuit through pull-up resistors (R2, R3), and the stabilizing tube Z2 is further connected with a capacitor C5 in parallel.

5. The LED lineal luminaire for outdoor lighting according to claim 1, wherein, An EMC circuit is further arranged in front of the rectification filtering circuit, comprising a thermistor CVR, a safety tube F1, an inductor L2 and an inductor L3 which are connected in series in the AC input circuit, the thermistor CVR and the inductor L2 are connected in series in the zero line N in sequence, the safety tube F1 and the inductor L3 are connected in series in the phase line L in sequence, and an X capacitor C1 is further connected in parallel between the AC input circuit.

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