LED footpath lamp for landscape lighting

Abstract

The utility model relates to the technical field of lighting lamps, aims to solve the technical problems of high power consumption and high cost of the conventional lamp driving circuit, and discloses an LED (light-emitting diode) footpath lamp for landscape lighting, which comprises a rectifying and filtering circuit, a control module, a triode and a light-emitting diode, the direct current output end of the rectification filter circuit is connected with the power supply end of the control module through the first current-limiting resistor and the second current-limiting resistor in sequence, the driving level output end of the control module is connected with the base electrode of the triode through the third current-limiting resistor, and the collector electrode of the triode is grounded through the fourth current-limiting resistor and the light-emitting diode in sequence. An emitter of the triode is connected with a common node of the first current-limiting resistor and the second current-limiting resistor; the AC frequency sampling end of the control module is connected with the phase line through the sampling resistor and is grounded through the first capacitor. The circuit design is optimized, the circuit structure is simple, the power consumption is low, the cost is low, and the operation is reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to lighting lamp technical field especially relates to a LED footpath lamp for landscape lighting. BACKGROUND

[0002] Under the background of global green environmental protection and energy saving, in recent years, LED technology has made remarkable progress in light efficiency, life and light color performance. Due to its energy saving, long life, simple driving mode and rich lamp color selection, semiconductor light emitting diode (LED) has been widely used in landscape lighting, digital traffic information display, guide sign, outdoor full-color display screen and indoor and outdoor lighting with low illumination requirement and other fields.

[0003] At present, low-power LED products usually adopt two driving circuit forms: constant current driving and voltage stabilizing driving. The output current of the constant current driving circuit remains constant, and the output voltage will change with the load; while the output voltage of the voltage stabilizing driving circuit is fixed, and the output current changes with the change of the load (the number of LEDs). In addition, according to the circuit form of power input and output, LED driving can also be divided into isolated driving and non-isolated driving. Isolated driving is typically represented by switching power supply, and non-isolated driving includes capacitor step-down type and constant current / voltage IC driving. These driving modes have their own characteristics in performance, power consumption, cost and application scenarios, and the relevant performance comparison table is shown in detail. However, the isolated driving mode generally has the problems of complex circuit scheme, high power consumption and high cost.

[0004] How to further reduce power consumption and cost while ensuring the reliability of LED driving to meet the demand of city lighting engineering for high efficiency and energy saving is a problem to be solved. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a LED footpath lamp for landscape lighting to solve the technical problems of high power consumption and high cost of the driving circuit of the existing lamp.

[0006] To achieve the above-mentioned purpose, the utility model provides a LED footpath lamp for landscape lighting, which comprises a rectifier filter circuit, a control module, a triode and a light emitting diode. The direct current output end of the rectifier filter circuit is connected with the power supply end of the control module in sequence through a first current limiting resistor and a second current limiting resistor. The driving level output end of the control module is connected with the base of the triode through a third current limiting resistor. The collector of the triode is connected with the ground in sequence through a fourth current limiting resistor and the light emitting diode. The emitter of the triode is connected with the common node of the first current limiting resistor and the second current limiting resistor. The alternating current frequency sampling end of the control module is connected with the phase line through a sampling resistor. The alternating current frequency sampling end of the control module is grounded through a first capacitor.

[0007] The conversion from alternating current to direct current is realized, and the safety and stability of the circuit are ensured through the current limiting resistor to prevent overcurrent from damaging the control module and subsequent circuits. The triode is used as a switch to control the on-off of the light-emitting diode, which has a simple structure, low cost and high reliability. The reasonable design of the current limiting resistors in the circuit improves the overall energy efficiency of the system, reduces the power consumption and prolongs the service life of the components. The combination of the sampling resistor and the first capacitor realizes the collection and filtering of the alternating frequency signal, so that the control module can accurately obtain the frequency information of the input voltage and ensure that the circuit can operate normally under different voltages. The adaptability of the control module to the input voltage fluctuation is improved, and the versatility and reliability of the lamp are enhanced.

[0008] Further, a fuse is arranged in the phase line and connected to the rear of the sampling resistor. By adding a fuse in the phase line, an overcurrent protection function is provided. When overload or short circuit occurs in the circuit, the current can be quickly cut off to avoid damage to the components and improve the safety of the overall circuit. Further improve the reliability of the circuit to ensure the service life of the LED lamp and the safety of the user.

[0009] Further, first and second stabilizing tubes are arranged, the two ends of the second current limiting resistor are connected to the cathodes of the first and second stabilizing tubes respectively, and the anodes of the first and second stabilizing tubes are grounded. The first and second stabilizing tubes stabilize the voltages of the power supply node and the control node respectively, ensuring that the power supply voltage of the control module and the LED light-emitting unit is within a safe range, and improving the stability and anti-interference ability of the circuit. The stabilizing design further improves the performance of the lamp, which still maintains normal operation when the external voltage fluctuates.

[0010] Further, the rectifier filter circuit includes a rectifier bridge, the phase line is connected to the first alternating current input end of the rectifier bridge through the fuse and the fifth current limiting resistor in sequence, the zero line is connected to the second alternating current input end of the rectifier bridge, and the second and third capacitors are connected in parallel across the fifth current limiting resistor. The rectifier bridge rectifies the alternating current into direct current, and the alternating component in the voltage is removed through the filter capacitor to make the direct current output more smooth and stable, meeting the driving requirements of the LED. The second capacitor works in cooperation with the fifth current limiting resistor to effectively reduce the impact of input current fluctuation on the circuit, improving the stability and life of the circuit.

[0011] The LED walkway lamp for landscape lighting has the following advantages:

[0012] The LED lamp is suitable for landscape lighting, combines city brightening requirements, utilizes power electronic rectification and constant current technology, optimizes current limiting design and high-efficiency rectification circuit, realizes remarkable energy saving and consumption reduction, and improves safety through current limiting protection and voltage stabilization function. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The lamp AC processing part circuit diagram is provided for the utility model;

[0014] Figure 2 The lamp DC and control lighting part circuit diagram is provided for the utility model.

[0015] In the figure: U1, control module; R65, first current limiting resistor; R55, second current limiting resistor; R56, R57 and R64, third current limiting resistor; R61, R62 and R63, fourth current limiting resistor; R67, fifth current limiting resistor; R66, sampling resistor; C37, first capacitor; C1, second capacitor; C39, third capacitor; L, phase line; N, zero ground; F1, fuse; Z5, first voltage stabilizing tube; Z6, second voltage stabilizing tube. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below by combining with the drawings and examples.

[0017] Refer to Figure 1 and Figure 2 The utility model provides a kind of LED walkway lamp for landscape lighting, including rectifier filter circuit for converting AC into DC and control circuit for controlling LED light and dark change, rectifier filter circuit includes diode D23, diode D24, diode D25 and diode D26, phase line L is connected in series with diode D25 anode by fuse F1, resistor R67, and the both ends of resistor R67 are connected with capacitor C1 and capacitor C39 in parallel.

[0018] The AC power is input from the L terminal and the N terminal, the capacitor C1 and the capacitor C39 are connected in parallel and have the same resistance value, and the capacitor C1 and the capacitor C39 jointly function as voltage reduction and current limiting; the input AC power is rectified into DC power by the rectifier bridge composed of the diode D23, the diode D24, the diode D25 and the diode D26; and the filter capacitor C38 is used to remove the AC component in the output voltage after rectification, so that the output voltage is more stable and smooth.

[0019] The control circuit comprises a control module U1, a Zener Z5, a Zener Z6, a triode Q8, a triode Q10 and a triode Q11, the first end of the control module U1 is connected with the rear stage of a fuse F1 through a resistor R66. The DC output end of the rectifier filter circuit is connected with the second end of the control module U1 in sequence through a resistor R65 and a resistor R55, the two ends of the resistor R55 are connected with the cathode of the Zener Z6 and the cathode of the Zener Z5 respectively, and the anode of the Zener Z6 and the anode of the Zener Z5 are grounded.

[0020] The Zener Z6 stabilizes the voltage of the first node, the Zener Z5 provides stable voltage for the control module U1, the resistor R55 and the resistor R65 are current limiting resistors, the resistor R66 and the capacitor C37 provide the AC input frequency for the control module U1, i.e. provide the AC sampling frequency for the control module U1, and the triode Q8, the triode Q10 and the triode Q11 are used to control the current change of the LED branch. The types of the Zener Z5 and the Zener Z6 are Schottky diodes.

[0021] The two ends of the resistor R55 are defined as a front node and a rear node, the Zener Z6 is responsible for stabilizing the voltage of the front node and is used to power the LED, the Zener Z5 is responsible for stabilizing the voltage of the rear node and provides stable power voltage for the control module U1, the resistors R55 and R65 function as current limiting protection, the resistor R66 and the capacitor C37 together provide the AC input frequency signal for the control module U1, i.e. realize the transmission of the AC sampling frequency, and the triode Q8, the triode Q10 and the triode Q11 are used to adjust the current change of the LED branch. Preferably, the Zener Z5 and the Zener Z6 are both Schottky diode types, and the triode Q8, the triode Q10 and the triode Q11 are all PNP type triodes.

[0022] The third end of the control module U1 is connected with the base of the triode Q8 through a resistor R56, the collector of the triode Q8 is grounded in sequence through a resistor R62, a light emitting diode D19 and a light emitting diode D20, and the emitter of the triode Q8 is connected with the cathode of the Zener Z6.

[0023] The 5th end of the control module U1 is connected with the base of the triode Q10 through the resistor R64, the collector of the triode Q10 is sequentially grounded through the resistor R63, the light emitting diode D17 and the light emitting diode D18, and the emitter of the triode Q8 is connected with the cathode of the stabilizing tube Z6.

[0024] The 4th end of the control module U1 is connected with the base of the triode Q11 through the resistor R57, the collector of the triode Q11 is sequentially grounded through the resistor R61, the light emitting diode D21 and the light emitting diode D22, and the emitter of the triode Q11 is connected with the cathode of the stabilizing tube Z6.

[0025] The resistors R59, R58 and R60 are respectively connected between the base and the emitter of the triode Q8, the triode Q10 and the triode Q11.

[0026] The control module U1 is a common driving chip, and the port connected with the triode can output high and low levels to control the conduction and cut-off of the triode, thereby controlling the on and off of the light emitting diode.

[0027] Taking the stepway lamp as an example, the above circuit is welded on a single-sided universal welding plate for testing.

[0028] The circuit parameters are tested by using an electro-optical source light color electricity comprehensive analysis system, and the results are as follows: when the input alternating voltage is 220V, the total current is 52mA, the actual power consumption of the circuit is 1.38W, and the power factor is 0.391.

[0029] In order to verify the working reliability of the circuit, 800 hours of electrical aging test are carried out.

[0030] The circuit has the characteristics of simple structure, reliable operation and low cost.

[0031] The LED stepway lamp for landscape lighting has the following advantages:

[0032] The utility model provides a kind of LED walkway lamp for landscape lighting, pass through the cooperation of current-limiting resistance and stabilivolt by optimizing circuit design, ensure circuit stability and security, reduce power consumption and production cost simultaneously;Utilize the switching control of triode to simplify circuit structure, improve reliability and adaptability;Through the accurate transmission of alternating current sampling frequency and voltage stabilizing technique, the adaptability of lamp to input voltage fluctuation is improved, and the service life of component is prolonged;Finally form the lighting solution with energy saving and consumption reducing, safe and reliable, low cost, simple structure, long service life and strong adaptability etc.

[0033] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, any modification, equivalent replacement and improvement etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An LED walkway luminaire for landscape lighting comprising a rectifier filter circuit, a control module (U1), a triode and a light emitting diode, characterized in that, The direct current output end of the rectification filter circuit is connected with the power supply end of the control module (U1) through the first current limiting resistor (R65) and the second current limiting resistor (R55) in sequence, the drive level output end of the control module (U1) is connected with the base of the triode through the third current limiting resistor (R56, R57, R64), the collector of the triode is grounded through the fourth current limiting resistor (R61, R62, R63) and the light emitting diode in sequence, the emitter of the triode is connected with the common node of the first current limiting resistor (R65) and the second current limiting resistor (R55); the alternating current frequency sampling end of the control module (U1) is connected with the phase line (L) through the sampling resistor (R66), and the alternating current frequency sampling end of the control module (U1) is grounded through the first capacitor (C37).

2. The LED step light for landscape lighting according to claim 1, wherein, The fuse (F1) is arranged in the phase line (L) circuit, and the sampling resistor (R66) is connected with the rear stage of the fuse (F1).

3. The LED step light for landscape lighting of claim 2, wherein, The first voltage stabilizing tube (Z5) and the second voltage stabilizing tube (Z6) are arranged, the two ends of the second current limiting resistor (R55) are respectively connected with the cathode of the first voltage stabilizing tube (Z5) and the cathode of the second voltage stabilizing tube (Z6), and the anodes of the first voltage stabilizing tube (Z5) and the second voltage stabilizing tube (Z6) are grounded.

4. The LED step light for landscape lighting according to claim 3, wherein, The rectification filter circuit comprises a rectification bridge, the phase line (L) is connected with the first alternating current input end of the rectification bridge through the fuse (F1) and the fifth current limiting resistor (R67) in sequence, the zero line (N) is connected with the second alternating current input end of the rectification bridge, and the second capacitor (C1) and the third capacitor (C39) are connected in parallel at the two ends of the fifth current limiting resistor (R67).

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