CN105491722A

CN105491722A - LED autotransformer driver

Info

Publication number: CN105491722A
Application number: CN201511022750.XA
Authority: CN
Inventors: 吴文武
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-12-31
Filing date: 2015-12-31
Publication date: 2016-04-13

Abstract

The invention provides an LED autotransformer driver. An induction transformer is combined with auto-induction voltage reduction as an inductor ballast to be provided to an LED lamp as a lighting drive power supply after being rectified and filtered.

Description

LED autotransformer driver

Technical field

LED illumination lamp driving power

Background technology

LED illumination lamp is made up of numerous light-emitting diode, is by connecting between them, and in parallel or connection in series-parallel combines.

Single pearl or single LEDs light-emitting diode it be powered by low-voltage DC, the general volt more than 2 of luminous voltage is within the scope of volt more than 3, the power supply device that the LED of serial or parallel connection needs one to be applicable to it, this power supply custom be upper title it be LED driver.

At present, the driving power scheme of LED has a lot, but the most frequently used is capacitance current-limiting Buck driver and Switching Power Supply driver, capacitance driver discharges so claim it to be capacitance-resistance driver by its to allow electric capacity resistance in parallel when idle, Switching Power Supply driver has used to obtain very general electronic switch transformer exactly at present, it is by being reverse into high frequency through electronic component again after the direct rectification of alternating current and then going the supply voltage required for high frequency transformer transformation becomes to go to power supplies such as LED, do the work of on off state so claim it to be Switching Power Supply or switch transformer with transistor in this conversion process.

In fact LED driver is exactly a kind ofly become a kind of LED that can be applicable to certain serial or parallel connection lamp pearl by user's High Level AC Voltage and normally light, the transformation of inductor also can accomplish this point, inductance coil also can be used for current limliting step-down, transformer also can become line voltage the LED use of certain power applicable, but just because simple inductor or the shortcoming such as its weight large volume of transformer is large are so current LED illumination industry seldom uses, at this, I combines inductance and transformer is that autotransformer is all over the body to do a kind of new LED illumination lamp driver.

Summary of the invention

Be used in LED illumination as a kind of driver in order to inductor element can be allowed, the invention provides a kind of LED autotransformer driver, its feature: two the interchange input pins receiving the bridge rectifier block be made up of four diodes with the centre cap output and ground of the decompression autotransformer of inductor, export from direct current and obtain the direct voltage after step-down transformer step-down through electrochemical capacitor filtering afterwards as the driving power of LED, this driving power is relatively applicable to the more lamp pearl of series connection and uses, transformer is primary and secondary is all same group of coil, step-down is carried out by the mode of self coupling, the voltage fallen is as the criterion depending on the sum voltage of a series connection small electric bulb number, driven to LED by rectifying and wave-filtering after transformer pressure-reducing, also have it also by inductance from centre cap and direct output over the ground, form current limit by inductance step-down supply LED, the efficiency utilizing inductor transformer that so just can be comprehensive by the supply power of two aspects, just constitute the minimizing of the volume and weight making transformer, can also adapt to alternating current be pressed with certain mobility scale can luminous lighting.

First, illustrate that its structure is also a kind of LED non-isolated power driving circuit, the efficiency of the transformer of inductor itself why is mainly fully utilized with autotransformer, a such as use one watt of one pearl be connected into 30 lamp pearls, total wattage is that the LED of 30 watts just can do the driving power of this LED with the inductive transformer of less than ten watts, because every LED lamp pearl has a minimum luminous voltage and a high light voltage the highest, generally minimum luminous voltage is 2.8V, and the highest high light voltage is about 3.6V, the fluctuation LED lamp bead of any voltage between this 2.8V--3.6V can normally work, if calculated with every pearl ceiling voltage, so the assembly of LED lamp bead of 30 is the direct voltage of 108V by voltage, so just can be arranged on can bear 200V alternating voltage autotransformer wire circle in the middle of to give to export in secondary coil 100V alternating voltage just passable, the coil position that can export 100V voltage picks out a centre tapped wiring come namely to hold the output AC voltage forming this lamp then to receive this LED of 30 watts as the power supply driving this lamp through rectifying and wave-filtering with common port.But when it can also be seen that the Non voltage output when secondary end, that is when the common port of autotransformer does not connect AC power, alternating current circuit also can from primary side can bear 120V coil from centre cap wiring flow through rectifier and carry out rectification then filtering go to light this LED, thus this process it only inductance ballast effect be not the effect of transformer, this is power supply process on the one hand, but be again an electric power-feeding structure after the secondary coil connection of autotransformer plays a role certainly, the electric power-feeding structure of these two aspects just constitutes a kind of comparatively ideal driving power.

Accompanying drawing explanation

Accompanying drawing is the structure chart of LED autotransformer driver

Embodiment

The autotransformer drive circuit of this inductor can only in the LED high-power lamp that series connection pearl number is more its advantage of competence exertion, but the LED of the pearl number of series connection again under full voltage drives has been best suited for, the pearl number of connecting exactly design lamp of less than 80 more than 30 is the most applicable, and series lamp pearl just can drive by direct full voltage more than 80.

Because the driving of autotransformer has the drive circuit of two aspects to combine, so the power of the inductor transformer selected can about the half of lamp power just, come again be exactly understand grasp this transformer unloaded capacity in how many turn coil just can bear one volt of voltage, that is the electric main pressure of 220V needs around how many turn coil just can afford, be aware of the voltage number of turns than afterwards, remaining is exactly see the series connection pearl number of lamp pearl, after devising the series connection pearl number of lamp pearl, after the minimum luminous voltage measuring single lamp pearl again and the most high-strength photovoltage, then go to design the number of turns required for secondary coil of autotransformer finally to connect rectifier rectification and go out the direct voltage electrochemical capacitor of parallel filtering on series lamp pearl again, the direct current that rectifier rectification goes out is distinguished and has positive and negatively been connect LED just.

Claims

1. in order to inductor element can be allowed to be used in LED illumination as a kind of driver, the invention provides a kind of LED autotransformer driver, its feature: two the interchange input pins receiving the bridge rectifier block be made up of four diodes with the centre cap output and ground of the decompression autotransformer of inductor, export from direct current and obtain the direct voltage after step-down transformer step-down through electrochemical capacitor filtering afterwards as the driving power of LED, this driving power is relatively applicable to the more lamp pearl of series connection and uses, transformer is primary and secondary is all same group of coil, step-down is carried out by the mode of self coupling, the voltage fallen is as the criterion depending on the sum voltage of a series connection small electric bulb number, driven to LED by rectifying and wave-filtering after transformer pressure-reducing, also have it also by inductance from centre cap and direct output over the ground, form current limit by inductance step-down supply LED, the efficiency utilizing inductor transformer that so just can be comprehensive by the supply power of two aspects, just constitute the minimizing of the volume and weight making transformer, can also adapt to alternating current be pressed with certain mobility scale can luminous lighting.