CN202602962U - Light-emitting diode (LED) illuminating lamp and circuit thereof - Google Patents

Abstract

The utility model relates to the field of light-emitting diode (LED) illuminating lamps and particularly relates to an LED illuminating lamp and a power circuit thereof. The LED illuminating lamp comprises a casing, a radiator, an LED lamp strip external power supply and the power circuit, the power circuit is arranged on a double-face power supply printed circuit board (PCB), the external power supply is connected with LED lamp strips through plugs, and the LED lamp strips are arranged between the casing and the radiator. The power circuit comprises a filter circuit, a rectification circuit, a voltage-reducing converting circuit and a constant current control circuit which are sequentially connected with one another, an alternating current power supply is filtered by the filter circuit, then alternating current of the alternating current power supply is converted into high voltage direct current through the rectification circuit, and the high voltage direct current is subjected to voltage reduction and then output to the LED lamp strips. The constant current control circuit samples output current through a drive chip. The LED illuminating lamp is compact in structure, small in size, convenient to install, long in service life and capable of reducing pollution on power grids, reducing power consumption and improving heat dissipation and warming of the power supply.

Description

LED illuminating lamp and circuit thereof

Technical field

The utility model relates to LED illuminating lamp field, relates in particular to a kind of LED illuminating lamp and power circuit thereof.

Background technology

Present inductive switch illuminating lamp; The general fluorescent lamp that all adopts the high pressure excitation and osram lamp are as light emitting source, and under the situation of the frequent induction of human body, control circuit can frequently be exported high level/low level control signal; Because the inherent characteristic of fluorescent lamp and osram lamp; Under the situation of frequent energising and outage, can shorten greatly the useful life of its light emitting source, therefore must often change power supply; Simultaneously, during line start, bigger electric current and higher starting resistor must be provided, so power consumption is very high, tungsten lamp or fluorescent lamp contain elements such as tungsten, mercury, sodium in addition, also can affect to environment.

The utility model content

The technical problem that utility model solves is: a kind of LED illuminating lamp and power circuit thereof are provided, have perfect heat-dissipating, stability of photoluminescence is strong, energy-efficient, the characteristics of long service life.

In addition, the utility model also provides a kind of power circuit of above-mentioned LED illuminating lamp.

The technical scheme that the utility model is taked is for providing a kind of LED illuminating lamp and power circuit thereof; Comprise shell, radiator, LED lamp bar external power supply and power circuit; Said power circuit is arranged on the two-sided power supply PCB wiring board; Said external power supply is connected with said LED lamp bar through plug, and said LED lamp bar is arranged between said shell and the said radiator.

Said power circuit comprises filter circuit, rectification circuit, step-down conversion circuit and the constant-current control circuit that connects successively; AC power is after filter circuit filtering; Become high voltage direct current through said rectification circuit again; Export said LED lamp bar to through said step-down conversion circuit step-down again, said constant-current control circuit is through chip for driving sampling output current.

Said filter circuit comprises two ac power input ends, fuse, the piezo-resistance that live wire input and zero line input constitute; Said fuse one end connects said live wire input; The other end connects said rectification circuit; Said piezo-resistance one end connects the common port of said fuse and said rectifier, and the other end connects the common port of said zero line input and said rectifier.

Said rectification circuit comprises bridge rectifier, the 4th electric capacity that is formed by four diode combinations; Said rectification circuit divides four the tunnel; The said fuse of leading up to connects said live wire input, and one the tunnel connects said zero line input, and one the tunnel connects the drain electrode of MOSFET pipe; Lead up to said the 4th capacity earth, said the 4th electric capacity other end connects between the drain electrode of said rectifier and MOSFET pipe.

Further improvement as the utility model; Said step-down conversion circuit comprises MOSFET pipe, transformer; The drain electrode of said MOSFET pipe is connected with said live wire input; The grid of said MOSFET pipe be connected with chip for driving input OUT through the tenth resistance, the source electrode that said MOSFET manages is leaded up to the 7th diode ground connection; The said transformer first pin ground connection, crus secunda divides two-way through the 9th diode and the 9th resistance of series connection, and one the tunnel is connected with the voltage input end VCC of chip for driving; The 6th resistance, the 5th resistance of connecting of leading up to is connected with said live wire input; Ten two resistance, ten one resistance of tripod through series connection divides three the tunnel, the one tunnel to manage source electrode with said MOSFET and be connected, and one the tunnel is connected with said chip for driving; Another road ground connection, the 4th pin is connected with LED lamp output through inductive bank.

Further improvement as the utility model; Said inductance L 1 comprises first inductance, second inductance; Said first inductance, one end connects the 4th pin of said transformer, and the other end connects LED lamp cathode output end, and said second inductance, one end connects LED lamp cathode output end; Other end ground connection is in series with the tenth diode, the 7th electric capacity, the 13 resistance between the 4th pin of said first inductance and said transformer.

Further improvement as the utility model; Said chip for driving comprises that power supply pin position, grounding leg position, the output pin position that drives outside MOSFET, the brightness adjustment control pin position by the direct voltage input, feedback compensation network pin position, power supply detect the pin position; Said power supply pin position is through the 5th capacity earth; Said current detecting pin position is through the 8th capacity earth, and said feedback compensation network pin position is through second capacity earth, and the 3rd capacity earth is passed through in said brightness adjustment control pin position by the direct voltage input.

The beneficial effect of the utility model is: compact conformation, volume are little, are convenient to install, and have reduced the pollution to electrical network, have prolonged LED lamp useful life, reduce power supply power consumption, and it is warm to have improved power supply heat sinking.

Description of drawings

Fig. 1 is the power circuit diagram of the LED illuminating lamp of the utility model.

Embodiment

Below in conjunction with description of drawings and embodiment the utility model is further specified.

As shown in Figure 1; The utility model provides a kind of LED illuminating lamp and power circuit thereof; Comprise shell, radiator, LED lamp bar external power supply and power circuit; Said power circuit is arranged on the two-sided power supply PCB wiring board, and said external power supply is connected with said LED lamp bar through plug, and said LED lamp bar is arranged between said shell and the said radiator.

Said power circuit comprises filter circuit, rectification circuit, step-down conversion circuit and the constant-current control circuit that connects successively; AC power is after filter circuit filtering; Become high voltage direct current through said rectification circuit again; Export said LED lamp bar to through said step-down conversion circuit step-down again, said constant-current control circuit makes the LED illuminating lamp be operated in constant current state through chip for driving sampling output current.

As shown in Figure 1; Fig. 1 is the power circuit diagram of this LED illuminating lamp; Said filter circuit comprises two ac power input ends, fuse F1, the piezo-resistance VD1 that live wire input L and zero line input N constitute, and said fuse F1 one end connects said live wire input L, and the other end connects said rectification circuit; Said piezo-resistance VD1 one end connects the common port of said fuse F1 and said rectifier, and the other end connects the common port of said zero line input N and said rectifier.Fuse F1 fuses when the circuit failed because automatically, thereby circuit is played a protective role.Electric current was excessive when piezo-resistance VD1 prevented power supply electrifying.

Said rectification circuit comprises bridge rectifier BR1, the 4th capacitor C 4 that is formed by four diode combinations; Said rectification circuit divides four the tunnel; The said fuse F1 of leading up to connects said live wire input L, and one the tunnel connects said zero line input N, and one the tunnel connects the drain electrode of MOSFET pipe Q1; Lead up to said the 4th capacitor C 4 ground connection, said the 4th capacitor C 4 other ends connect between the drain electrode of said bridge rectifier BR1 and MOSFET pipe Q1.

Said step-down conversion circuit comprises MOSFET pipe Q1, transformer T1; The drain electrode of said MOSFET pipe Q1 and said live wire input connect L and connect; The grid of said MOSFET pipe Q1 be connected with chip for driving input OUT through the tenth resistance R 10, the source electrode that said MOSFET manages Q1 is leaded up to the seven or two utmost point D7 ground connection; Said transformer T1 one pin ground connection; Crus secunda is through the 9th diode D9 and 9 fens two-way of the 9th resistance R of series connection; One the tunnel is connected with the voltage input end VCC of chip for driving, and the 6th resistance R 6, the 5th resistance R 5 of series connection of leading up to is connected with said live wire input L, the 12 resistance R the 12, the 11 resistance R that tripod passes through to connect 11 minutes three tunnel; One the tunnel manages the Q1 source electrode with said MOSFET is connected; One the tunnel is connected with said chip for driving, another road ground connection, and the 4th pin is connected with LED lamp output through inductive bank.

Said inductive bank comprises the first inductance L 1-A, the second inductance L 1-B; The said first inductance L 1-A, one end connects the 4th pin of said transformer, and the other end connects LED lamp cathode output end LED+, and the said second inductance L 1-B, one end connects LED lamp cathode output end LED-; And external LED lamp bar; For this lamp bar provides operating voltage, other end ground connection is in series with the tenth diode D12, the 7th capacitor C the 7, the 13 resistance R 13 between the 4th pin of said first inductance L 1-A and said transformer T1.

Said chip for driving comprises that power supply pin position VCC, grounding leg position GND, the output pin position OUT that drives outside MOSFET, the brightness adjustment control pin position DIM by the direct voltage input, feedback compensation network pin position COMP, power supply detect pin position CS; Said power supply pin position VCC is through the 5th capacitor C 5 ground connection; Said current detecting pin CS position is through the 8th capacitor C 8 ground connection; Be connected with the MOSFET electric current; Said feedback compensation network pin position COMP is through second capacitor C, 2 ground connection, and said brightness adjustment control pin position DIM by the direct voltage input passes through the 3rd capacitor C 3 ground connection.

Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under the utility model, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the protection range of the utility model.

Claims (7)

1. LED illuminating lamp and power circuit thereof; It is characterized in that: comprise shell, radiator, LED lamp bar external power supply and power circuit; Said power circuit is arranged on the two-sided power supply PCB wiring board; Said external power supply is connected with said LED lamp bar through plug, and said LED lamp bar is arranged between said shell and the said radiator.

2. LED illuminating lamp according to claim 1 and power circuit thereof; It is characterized in that: said power circuit comprises filter circuit, rectification circuit, step-down conversion circuit and the constant-current control circuit that connects successively; AC power is after filter circuit filtering; Become high voltage direct current through said rectification circuit again, export said LED lamp bar to through said step-down conversion circuit step-down again, said constant-current control circuit is through chip for driving sampling output current.

3. LED illuminating lamp according to claim 2 and power circuit thereof; It is characterized in that: said filter circuit comprises two ac power input ends, fuse, the piezo-resistance that live wire input and zero line input constitute; Said fuse one end connects said live wire input; The other end connects said rectification circuit, and said piezo-resistance one end connects the common port of said fuse and said rectifier, and the other end connects the common port of said zero line input and said rectifier.

4. according to said LED illuminating lamp of claim 2 and power circuit thereof; It is characterized in that: said rectification circuit comprises bridge rectifier, the 4th electric capacity that is formed by four diode combinations, and said rectification circuit divides four the tunnel, and the said fuse of leading up to connects said live wire input; One the tunnel connects said zero line input; One the tunnel connects the drain electrode of MOSFET pipe, leads up to said the 4th capacity earth, and said the 4th electric capacity other end connects between the drain electrode that said rectifier and MOSFET manage.

5. according to said LED illuminating lamp of claim 2 and power circuit thereof; It is characterized in that: said step-down conversion circuit comprises MOSFET pipe, transformer; The drain electrode of said MOSFET pipe is connected with said live wire input; The grid of said MOSFET pipe be connected with chip for driving input OUT through the tenth resistance, the source electrode that said MOSFET manages is leaded up to the 7th diode ground connection; The said transformer first pin ground connection, crus secunda divides two-way through the 9th diode and the 9th resistance of series connection, and one the tunnel is connected with the voltage input end VCC of chip for driving; The 6th resistance, the 5th resistance of connecting of leading up to is connected with said live wire input; Ten two resistance, ten one resistance of tripod through series connection divides three the tunnel, the one tunnel to manage source electrode with said MOSFET and be connected, and one the tunnel is connected with said chip for driving; Another road ground connection, the 4th pin is connected with LED lamp output through inductive bank.

6. according to said LED illuminating lamp of claim 5 and power circuit thereof; It is characterized in that: said inductance L 1 comprises first inductance, second inductance; Said first inductance, one end connects the 4th pin of said transformer, and the other end connects LED lamp cathode output end, and said second inductance, one end connects LED lamp cathode output end; Other end ground connection is in series with the tenth diode, the 7th electric capacity, the 13 resistance between the 4th pin of said first inductance and said transformer.

7. according to claim 1 to 6 each said LED illuminating lamp and power circuit thereof; It is characterized in that: said chip for driving comprises that power supply pin position, grounding leg position, the output pin position that drives outside MOSFET, the brightness adjustment control pin position by the direct voltage input, feedback compensation network pin position, power supply detect the pin position; Said power supply pin position is through the 5th capacity earth; Said current detecting pin position is through the 8th capacity earth; Said feedback compensation network pin position is through second capacity earth, and the 3rd capacity earth is passed through in said brightness adjustment control pin position by the direct voltage input.

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