CN202005018U

CN202005018U - Alternating current driving high-voltage pulsating light-emitting LED (light-emitting diode) driving circuit

Info

Publication number: CN202005018U
Application number: CN2011200127201U
Authority: CN
Inventors: 张庆
Original assignee: DONGYING JIAWEN PHOTOELECTRIC Co Ltd
Current assignee: DONGYING JIAWEN PHOTOELECTRIC Co Ltd
Priority date: 2011-01-17
Filing date: 2011-01-17
Publication date: 2011-10-05
Anticipated expiration: 2021-01-17

Abstract

The utility model provides an alternating current driving high-voltage pulsating light-emitting LED (light-emitting diode) driving circuit, comprising an LED luminous unit and a driving circuit; the driving circuit comprises an alternating current input rectifying unit, a protective unit and a current stabilization unit, wherein the alternating current input rectifying unit is respectively connected with the protective unit and the LED luminous unit, the protective unit is connected with the current stabilization unit, and the LED luminous unit is connected with the current stabilization unit. The alternating current driving high-voltage pulsating light-emitting LED driving circuit has the beneficial effects that the structure is simple, the electronic elements are few, the circuit volume is small, the service life is long and a light source closes to natural light.

Description

The emitting led drive circuit of the high-pressure pulsating of AC driving

Technical field

The utility model belongs to the led drive circuit design field, especially relates to a kind of emitting led drive circuit of high-pressure pulsating of AC driving.

Background technology

Up to the present, though the phase I of simple and easy constant current-non-isolation type and the second stage of constant current-isolated form have successively been experienced in the development of LED Constant Direct Current power supply, and entering phase III of PF correction-constant current constant voltage-isolated form, it is in the life-span, the power supply size, in price intrinsic shortcoming still can't be significantly improved.For this reason, a kind of novel AC driving technology that is named as AC-LED is being suggested and is obtaining to develop rapidly over nearly 5 years.

The basic conception of AC-LED is not use the AC-DC conversion and the rectification circuit of extra (beyond the chip), the mode that changes the collocation current-limiting resistance into is avoided loss in efficiency, large-size, labyrinth and the age limit of using the Constant Direct Current power supply to cause directly with the alternating current driving LED.The important breakthrough of AC-LED light source is that the LED device is as independent component or the integrated unit specific combination technology in encapsulation or chip array integrating process, utilize the diode characteristic double as rectification of LED PN junction or Schottky knot simultaneously, adopt staggered matrix form to arrange technology, and in chip design, add bridge circuit, two groups of reverse parallel connection LED devices or Schottky knot rearrange the structure of a similar rectifier bridge, the two ends of rectifier bridge directly connect AC power respectively, in addition two ends connect more can be shared the series LED device, and the positive half period of current-limiting resistance alternating current and two brachium pontis of negative half period and shared series LED device maintenance conducting, the last electric current of LED has unidirectional, the varied non-sinusoidal characteristic, 0 to cyclic variation between the peak current, its respective frequencies is 60 or 120Hz, because eyes have eye storage characteristic, the LED mode of operation that periodic intensity changes can be read as continuously luminous in human eye.

The LED number that series connection is used in AC-LED needs to determine according to concrete parameter, utility grid voltage (110V or 220V) and the required illuminance of light path, LED and Schottky knot, and carry out electric current by series resistance or electric capacity and limit, even as a key character of AC LED is that LED also is luminous continuously on the condition of forward bias voltage, this is because the LED terminal voltage always changes to peak period from 0 with sinusoidal form.When being lower than the cut-in voltage of LED, LED will keep off state, and no current passes through, and will be also not luminous, and only after the LED both end voltage is opened pressure above threshold value, just conducting of LED have light output, and optical output power will rise to peak value with the voltage increase always.

Therefore in AC-LED, the voltage at each LED device two ends is that sinusoidal period changes, the electric current of LED and optical output power then present non-string form from 0 to constantly changing between peak value, calculating shows that AC-LED is in one-period, there is time to be in off state near 40%, and in the time of conducting, the operating current of nearly 40% time LED surpasses the operating current of the constant current power supply LED with identical luminosity, and its peak current reaches more than four times of constant current LED.

Because constant voltage constant current power has traditionally been given up in the application of AC-LED, removed unnecessary electronic component, and reduced cost, the LED Design of Luminaires is oversimplified and volume can further reduce, and has avoided loss in efficiency and the age limit introduced in AC-to-DC conversion and the voltage stabilization and current stabilization circuit fully.Make the AC-LED technology in the miniaturization of LED light fixture, bigger success has been obtained in reliability and long service live field.At present, U.S. Link labs, III-N Technology, the Soul-semiconductors of Korea S, and the Industrial Technology Research Institute of Taiwan's electric light all applied for relevant patented technology, the application of AC-LED at lighting field also promoted in exploitation with all strength.

But AC-LED has a potential basic weakness: both since the operating current of AC-LED under the luminous state of device, most of times will be far above the DC-LED operating current of the same brightness of correspondence, reach four times of gaps at peak value, the internal quantum efficiency of AC-LED device itself is because the restriction of optical efficiency decline (droop effect) will be lower than the DC-LED with identical luminosity, the reason that Droop effect exists is comparatively complicated, depend on the polarity effect that comprises nitride material, auger recombination (Auger combination), the junction temperature of diode (junction temperature), the influence of the bunching effect of phosphide atom multiple materials such as (In-rich) and LED structure.To the internal quantum efficiency of AC-LED, the basic restriction of generation is calculated and to be shown that power is the internal quantum efficiency of AC-LED of 1W about the low 15-20% of Constant Direct Current LED with constant power output, and this difference has coverd with shade for the long-run development of AC-LED technology.

In sum, we need develop a kind of new LED technology, the advantage that can keep AC-LED: both simplified the design of driving power as much as possible, remove unnecessary electronic component to realize the simplification of LED design, reduce the cost of LED light fixture, reduce volume, and make the device life time of the life-span of LED light fixture near LED, simultaneously our internal quantum efficiency of wishing this new LED device near or reach the efficient of corresponding direct-current LED so that realize efficient luminous lighting.

Summary of the invention

The purpose of this utility model provides a kind of emitting led drive circuit of high-pressure pulsating of simple in structure, number of electronic components is few, the circuit volume is little, the life-span is long AC driving.

The technical solution of the utility model is: the emitting led drive circuit of the high-pressure pulsating of AC driving; comprise LED luminescence unit and drive circuit; described drive circuit comprises interchange input rectifying unit, protected location and current stabilization unit; described interchange input rectifying unit links to each other with described protected location, described LED luminescence unit respectively; described protected location links to each other with described current stabilization unit, and described LED luminescence unit links to each other with described current stabilization unit.

Described interchange input rectifying unit comprises the rectifier bridge that is made of first diode, second diode, the 3rd diode, the 4th diode; two inputs of described rectifier bridge connect the live wire and the zero line of power supply respectively; first output of described rectifier bridge connects the anode tap of described protected location and described LED luminescence unit respectively, second output head grounding of described rectifier bridge.

Described protected location comprises first electric capacity, second electric capacity, first resistance and second resistance; one end of described first resistance and first output of described rectifier bridge link to each other; its other end is by first capacity earth; one end of described second resistance and first output of described rectifier bridge link to each other, and its other end connects by second capacity earth.

Described current stabilization unit comprises NPN type first triode, NPN type second triode and the 3rd resistance, the collector electrode of the base stage of described first triode and described second triode is connected in a common port, common port between this common port and described second resistance, described second electric capacity links to each other, the base stage of the emitter of described first triode and described second triode is connected in a common port, this common port is by the 3rd grounding through resistance, the grounded emitter of described second triode, the collector electrode of described first triode connects the cathode terminal of described LED luminescence unit.

Advantage and the good effect that the utlity model has are:

1, this LED has obtained greatly in circuit design with on constituting and has simplified; because accurately step-down and current stabilization; and reduced electronic component to the utmost; reduced the circuit volume; reduced cost; simultaneously because this circuit only need use the following solid ceramic condenser of 10UF; avoided the life problems (＜10000 hours) that the big capacity electrolyte electric capacity of use is brought in traditional Constant Direct Current power supply fully; the accelerated tests proof pulsation LED life-span is at home (normal temperature; temperature) surpasses 50,000 hours under the condition, near the ultimate life of LED device.

2, the electric current excursion is little, makes pulsation LED intensity variations scope much smaller than AC-LED, more approaches continuous lighting technology.

Description of drawings

Fig. 1 is a circuit diagram of the present utility model.

Embodiment

The utility model comprises LED luminescence unit 1 and the drive circuit that is in series by one or more LED, described drive circuit comprises interchange input rectifying unit 2, protected location 3 and current stabilization unit 4, described interchange input rectifying unit 2 links to each other with described protected location 3, described LED luminescence unit 1 respectively, described protected location 3 links to each other with described current stabilization unit 4, and described LED luminescence unit 1 links to each other with described current stabilization unit 4; Q1 and Q2 are that two high voltage N PN triodes and amplification coefficient are about 100 in this circuit; C1/R1 and C2/R2 carry out current limliting and overvoltage protection as ceramic condenser to the LED electric current; make the work of LED not be subjected to surge high-pressure sharp pulse voltage sag; and the electric wire The noise, as the current stabilization unit LED Current Control is made pulsatile change by the mirror image power supply that triode and emitter resistance are formed near mean value at last.

As shown in Figure 1; described interchange input rectifying unit 2 comprises the rectifier bridge that is made of the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4; two inputs of described rectifier bridge connect the live wire and the zero line of power supply respectively; first output of described rectifier bridge connects the anode tap of described protected location and described LED luminescence unit respectively, second output head grounding of described rectifier bridge.

Described protected location 3 comprises first capacitor C 1, second capacitor C 2, first resistance R 1 and second resistance R 2; one end of described first resistance R 1 and first output of described rectifier bridge link to each other; its other end is by first capacitor C, 1 ground connection; one end of described second resistance R 2 and first output of described rectifier bridge link to each other, and its other end connects by second capacitor C, 2 ground connection.

Described current stabilization unit comprises the NPN type first triode Q1, NPN type second triode Q2 and the 3rd resistance R 3, the collector electrode of the base stage of the described first triode Q1 and the described second triode Q2 is connected in a common port, this common port and described second resistance R 2, common port between described second capacitor C 2 links to each other, the base stage of the emitter of the described first triode Q1 and the described second triode Q2 is connected in a common port, this common port is by the 3rd resistance R 3 ground connection, the grounded emitter of the described second triode Q2, the collector electrode of the described first triode Q1 connects the cathode terminal of described LED luminescence unit.

More than an embodiment of the present utility model is had been described in detail, but described content only is preferred embodiment of the present utility model, can not be considered to be used to limit practical range of the present utility model.All equalizations of doing according to the utility model application range change and improve etc., all should still belong within the patent covering scope of the present utility model.

Claims

1. the emitting led drive circuit of the high-pressure pulsating of AC driving; comprise LED luminescence unit and drive circuit; it is characterized in that: described drive circuit comprises interchange input rectifying unit, protected location and current stabilization unit; described interchange input rectifying unit links to each other with described protected location, described LED luminescence unit respectively; described protected location links to each other with described current stabilization unit, and described LED luminescence unit links to each other with described current stabilization unit.

2. the emitting led drive circuit of the high-pressure pulsating of AC driving according to claim 1; it is characterized in that: described interchange input rectifying unit comprises the rectifier bridge that is made of first diode, second diode, the 3rd diode, the 4th diode; two inputs of described rectifier bridge connect the live wire and the zero line of power supply respectively; first output of described rectifier bridge connects the anode tap of described protected location and described LED luminescence unit respectively, second output head grounding of described rectifier bridge.

3. the emitting led drive circuit of the high-pressure pulsating of AC driving according to claim 1; it is characterized in that: described protected location comprises first electric capacity, second electric capacity, first resistance and second resistance; one end of described first resistance and first output of described rectifier bridge link to each other; its other end is by first capacity earth; one end of described second resistance and first output of described rectifier bridge link to each other, and its other end connects by second capacity earth.

4. the emitting led drive circuit of the high-pressure pulsating of AC driving according to claim 1, it is characterized in that: described current stabilization unit comprises NPN type first triode, NPN type second triode and the 3rd resistance, the collector electrode of the base stage of described first triode and described second triode is connected in a common port, this common port and described second resistance, common port between described second electric capacity links to each other, the base stage of the emitter of described first triode and described second triode is connected in a common port, this common port is by the 3rd grounding through resistance, the grounded emitter of described second triode, the collector electrode of described first triode connects the cathode terminal of described LED luminescence unit.