CN203167364U - LED driving power supply with electromagnetic compatibility - Google Patents

Abstract

The utility model relates to the LED light fixture field and especially relates to an LED driving power supply with electromagnetic compatibility. The LED driving power supply comprises an electromagnetic compatibility circuit, a surge circuit, a buffer circuit and a constant current feedback circuit. The electromagnetic compatibility circuit is connected with the surge circuit and the buffer circuit. The constant current feedback circuit is connected with the buffer circuit. By adopting the above-mentioned technical scheme, the LED driving power supply enables relatively-high-standard electromagnetic compatibility. The competitiveness of products is further increased.

Description

A kind of LED driving power that possesses electromagnetic compatibility

Technical field

The utility model relates to the LED field of light fittings, particularly a kind of LED driving power that possesses electromagnetic compatibility.

Background technology

(Light Emitting Diode LED), is a kind of semiconductor subassembly to light-emitting diode, is a kind of solid-state semiconductor device.Semiconductor wafer is made up of two parts, and a part is P type semiconductor, occupies an leading position in its hole, the inside, and the other end is N type semiconductor, mainly is electronics here.But when these two kinds of semiconductors couple together, just form one " P-N knot " between them.When electric current acted on this wafer by lead, electronics will be pushed to the P district, and electronics will send energy with the form of photon, the luminous principle of LED that Here it is then with hole-recombination in the P district.And the LED light wavelength color of light just is to be determined by the material that forms the P-N knot.Initial LED is used as indicator light, display panel etc. more; Along with the appearance of white light LEDs, also be used as illumination.It is described as the new type light source of 21 century, has the efficient height, and the life-span is long, not conventional light source such as cracky advantage that can't compare with it.When adding forward voltage, light-emitting diode can send monochrome, discontinuous light, and this is a kind of of electroluminescent effect.Change the chemical composition of the semi-conducting material that adopts, can make light-emitting diode be emitted near ultraviolet ray, visible light or ultrared light.

Under the global energy background that extremely worry of shortage raises once again, energy savings is the major issue that we shall face future, and particularly at lighting field, the application of LED luminous product is just attracting common people's sight.LED must be developing tendency in future as a kind of novel green light source product, and it is the novel illumination light source epoch of representative that 21st century will enter with LED.LED light fixture and incandescent lamp are relatively, its maximum motive force of development is exactly advantages of energy saving and environmental protection, but since cost too high, cause price than conventional lamp height several class, allow the consumer really consume with all one's heart, also need under the prerequisite of guaranteed quality, the price of product further descend.

(Electromagnetic Compatibility EMC), refers to that the operation that meets the requirements of equipment or system does not produce the ability of intolerable electromagnetic disturbance to any equipment in its environment to Electro Magnetic Compatibility in its electromagnetic environment.EMC comprises the requirement of two aspects: (Electromagnetic Disturbance ED) can not surpass certain limit value to the electromagnetic disturbance that the equipment that refers on the one hand produces the place environment in normal course of operation; The equipment that refers on the other hand has to a certain degree immunity to interference to the electromagnetic disturbance that exists in the environment of place, namely electromagnetic susceptibility (Electromagnetic Susceptibility, EMS).

Be on the thematic illumination market now with energy-conserving and environment-protective, the incandescent lamp of waste electric energy has progressively withdrawed from our life, more energy-conservation LED light fixture then moves towards the road popularized, particularly the consumer of European various countries is higher to energy-conserving and environment-protective aspect consciousness, and this will be the inning of domestic LED products export.But in the Valuation Standard of American-European countries, Electro Magnetic Compatibility is important index wherein.It's a pity very much, since home products to the requirement of Electro Magnetic Compatibility well below American-European countries, make domestic project planner in the process of design lamps, not recognize the significance of Electro Magnetic Compatibility, just do not meet the standard Electro Magnetic Compatibility for the LED Design of Luminaires yet, cause in the market most of LED driving power even LED light fixture can't satisfy the electromagnetic compatibility requirement of American-European countries, for outlet has increased difficulty.

Summary of the invention

Goal of the invention of the present utility model is to provide a kind of LED driving power that possesses electromagnetic compatibility, uses the technical solution of the utility model, can improve competitiveness of product so that the LED driving power possesses the Electro Magnetic Compatibility of higher standard.

In order to realize the foregoing invention purpose, complete technical scheme of the present utility model is:

A kind of LED driving power that possesses electromagnetic compatibility comprises: electromagnetic compatibility circuit, surge circuit, buffer loop, constant current feedback circuit; The electromagnetic compatibility circuit is connected with surge circuit, buffer circuit; The constant current feedback circuit connects buffer circuit.

Optionally, the electromagnetic compatibility circuit comprises common mode inductance, X electric capacity, Y electric capacity, inductance, first electric capacity, second electric capacity, rectifier bridge; The two ends of inductance connect an end of first electric capacity and second electric capacity separately; The other end of first electric capacity and second electric capacity is connected rectifier bridge simultaneously; Common mode inductance is connected rectifier bridge simultaneously with X electric capacity; Y electric capacity connects the constant current feedback circuit.

Optionally, the surge circuit comprises thermistor, piezo-resistance; Thermistor connects common mode inductance; The piezo-resistance two ends connect rectifier bridge simultaneously.

Optionally, buffer loop comprises first resistance, the 3rd electric capacity and diode; The 3rd electric capacity connects diode; The two ends of first resistance are connected the two ends of the 3rd electric capacity.

Optionally, the constant current feedback circuit comprises high frequency transformer, diode, filter capacitor, second resistance, the 3rd resistance, the 4th resistance, voltage-stabiliser tube, triode and optocoupler;

One end of filter capacitor connects an end of second resistance, diode and voltage-stabiliser tube simultaneously, and the other end of filter capacitor connects the emitter of triode, an end of high frequency transformer and an end of the 3rd resistance simultaneously; The other end of voltage-stabiliser tube connects an end of the 4th resistance; The other end of second resistance connects an end of optocoupler, and the other end of optocoupler connects the collector electrode of triode; The base stage of triode connects the other end of the 3rd resistance and the other end of the 4th resistance simultaneously.

Therefore, use the present embodiment technical scheme, can improve competitiveness of product so that the LED driving power possesses the Electro Magnetic Compatibility of higher standard.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

The circuit diagram that Fig. 1 provides for the embodiment of the invention 1.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.

Embodiment 1:

As shown in Figure 1, present embodiment discloses a kind of LED driving power that possesses electromagnetic compatibility, and it comprises: electromagnetic compatibility circuit, surge circuit, buffer loop, constant current feedback circuit; The electromagnetic compatibility circuit is connected with surge circuit, buffer circuit; The constant current feedback circuit connects buffer circuit.

Concrete, the electromagnetic compatibility circuit comprises common mode inductance L1, X capacitor C X1, Y capacitor C Y1, inductance L 2, first capacitor C 1, second capacitor C 2, rectifier bridge BD1; The two ends of inductance L 2 connect an end of first capacitor C 1 and second capacitor C 2 separately; The other end of first capacitor C 1 and second capacitor C 2 is connected rectifier bridge BD1 simultaneously; Common mode inductance L1 is connected rectifier bridge BD1 simultaneously with X capacitor C X1; Y capacitor C Y1 connects the constant current feedback circuit.

Concrete, the surge circuit comprises thermistor NTC, piezo-resistance RV; Thermistor NTC connects common mode inductance L1; Piezo-resistance RV two ends connect rectifier bridge BD1 simultaneously.

Concrete, buffer loop comprises first resistance R 1, the 3rd capacitor C 4 and diode D1; The 3rd capacitor C 4 connects diode D1; The two ends of first resistance R 1 are connected the two ends of the 3rd capacitor C 4.

Concrete, the constant current feedback circuit comprises high frequency transformer T1, diode D2, filter capacitor C5, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, voltage-stabiliser tube D3, triode Q1 and optocoupler U1; The end of filter capacitor C5 connects the end of second resistance R 2, diode D2 and voltage-stabiliser tube D3 simultaneously, and the other end of filter capacitor C5 connects the emitter of triode Q1, the end of high frequency transformer T1 and an end of the 3rd resistance R 3 simultaneously; The other end of voltage-stabiliser tube D3 connects an end of the 4th resistance R 4; The other end of second resistance R 2 connects the end of optocoupler U1, and the other end of optocoupler U1 connects the collector electrode of triode Q1; The base stage of triode Q1 connects the other end of the 3rd resistance R 3 and the other end of the 4th resistance R 4 simultaneously.

As shown in Figure 1, for the concrete use of clear statement present embodiment, a kind of Controlled in Current Mode and Based solution that the NCP1014 of adding provides for ON company, the input power is 4W.

Common mode inductance L1 in the electromagnetic compatibility circuit and Y electric capacity mainly are the common mode interference signals in the filtering electromagnetic interference, and X capacitor C X1 and inductance L 2, first capacitor C 1, second capacitor C 2 mainly are the difference mode signals in the filtering electromagnetic interference.

The surge circuit is made up of thermistor NTC and piezo-resistance RV, and clamp voltage is in input when surge voltage occurs, and the protection late-class circuit is not damaged;

Buffer loop mainly is the voltage peak point that absorbing high-frequency transformer T1 leakage inductance produces;

In the constant current feedback circuit, high frequency transformer T1 and diode D2 form typical reverse exciting topological, transmit energy by coil windings and give load.When system stability, output voltage is proportional to the base voltage of triode Q1.When output loading increases, the base voltage of triode Q1 raises, the electric current that flows through triode Q1 collector and emitter simultaneously also increases, pass through the photoelectricity coupling of optocoupler U1 again, the voltage of the feedback input end FB pin of NCP1014 chip is dragged down, chip is adjusted the duty ratio of the pulse voltage of metal-oxide-semiconductor grid automatically, makes feedback loop stable, thereby reaches the effect of output constant current.

Device embodiment described above only is schematic, wherein said unit as the separating component explanation can or can not be physically to separate also, the parts that show as the unit can be or can not be physical locations also, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select wherein some or all of module to realize the purpose of present embodiment scheme according to the actual needs.Those of ordinary skills namely can understand and implement under the situation of not paying performing creative labour.

Above-described execution mode does not constitute the restriction to this technical scheme protection range.Any at above-mentioned execution mode spirit and principle within do modification, be equal to and replace and improvement etc., all should be included within the protection range of this technical scheme.

Claims (5)

1. a LED driving power that possesses electromagnetic compatibility is characterized in that, comprising:

Electromagnetic compatibility circuit, surge circuit, buffer loop, constant current feedback circuit;

The electromagnetic compatibility circuit is connected with surge circuit, buffer circuit;

The constant current feedback circuit connects buffer circuit.

2. a kind of LED driving power that possesses electromagnetic compatibility as claimed in claim 1 is characterized in that:

Described electromagnetic compatibility circuit comprises common mode inductance, X electric capacity, Y electric capacity, inductance, first electric capacity, second electric capacity, rectifier bridge;

The two ends of described inductance connect an end of first electric capacity and second electric capacity separately;

The other end of described first electric capacity and second electric capacity is connected rectifier bridge simultaneously;

Common mode inductance is connected rectifier bridge simultaneously with X electric capacity;

Y electric capacity connects the constant current feedback circuit.

3. a kind of LED driving power that possesses electromagnetic compatibility as claimed in claim 2 is characterized in that:

Described surge circuit comprises thermistor, piezo-resistance;

Thermistor connects common mode inductance;

The piezo-resistance two ends connect rectifier bridge simultaneously.

4. a kind of LED driving power that possesses electromagnetic compatibility as claimed in claim 3 is characterized in that:

Described buffer loop comprises first resistance, the 3rd electric capacity and diode;

Described the 3rd electric capacity connects diode;

The two ends of described first resistance are connected the two ends of described the 3rd electric capacity.

5. a kind of LED driving power that possesses electromagnetic compatibility as claimed in claim 4 is characterized in that:

Described constant current feedback circuit comprises high frequency transformer, diode, filter capacitor, second resistance, the 3rd resistance, the 4th resistance, voltage-stabiliser tube, triode and optocoupler;

One end of described filter capacitor connects an end of second resistance, diode and voltage-stabiliser tube simultaneously, and the other end of filter capacitor connects the end of emitter high frequency transformer of described triode and an end of described the 3rd resistance simultaneously;

The other end of described voltage-stabiliser tube connects an end of described the 4th resistance;

The other end of described second resistance connects an end of described optocoupler, and the other end of described optocoupler connects the collector electrode of described triode;

The base stage of described triode connects the other end of described the 3rd resistance and the other end of described the 4th resistance simultaneously.

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