CN109561532A - A kind of high voltage direct current LED constant current circuit - Google Patents
A kind of high voltage direct current LED constant current circuit Download PDFInfo
- Publication number
- CN109561532A CN109561532A CN201710874219.8A CN201710874219A CN109561532A CN 109561532 A CN109561532 A CN 109561532A CN 201710874219 A CN201710874219 A CN 201710874219A CN 109561532 A CN109561532 A CN 109561532A
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- Prior art keywords
- current
- constant
- circuit
- power supply
- led light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Abstract
The invention discloses a kind of high voltage direct current LED constant current circuits, including centrally connected power supply power supply device, multiple LED light strings, multiple current regulator diodes, it is characterized by: corresponding current regulator diode of connecting in each described LED light string, the LED light string and the current regulator diode form a branch, and the branch circuit parallel connection is between the output bus anode and output bus negative terminal of centrally connected power supply power supply device.The present invention uses high voltage direct current centrally connected power supply mode power, power supply output connects LED light string and constant-current circuit, and every a string of high-voltage LEDs use independent constant-current circuit constant current, and every group of circuit supports PWM light modulation, the application of the circuit to solve the problems such as conventional low LED power supply and constant-current circuit device cost height, input power factor is low, power-efficient is low, controllability is low.
Description
Technical field
The present invention relates to LED circuit technical field more particularly to a kind of high voltage direct current LED constant current circuits.
Background technique
Light emitting diode (LED) solid light source has many advantages, such as luminous efficiency height, environmental protection, long-life, is known as the 5th generation
Lighting source.Development of Novel LED illumination is an important directions of current light source and lighting engineering development.LED light source is in many
In, incandescent lamp is replaced in especially extraordinary application and fluorescent lamp is trend of the times, as traffic lights, extraordinary landscape shine
The high extraordinary application of the security requirements such as bright, colliery railway.But the engineering higher operating costs of current LED, to LED illumination light
There is also certain resistances for the popularization in source.
In the driving circuit of LED, low-voltage LED constant-current drive technology is more, and low-voltage driving technical difficulty is smaller, main suitable
Together in LED flashlight and some handheld devices, to be applied to the occasion of 220V Alternating Current Power Supply, the power supply of Yao Zengjia AC/DC
Part provides lower DC voltage, this scheme can be such that cost greatly improves.Using constant-current drive technology, phase can be obtained
With light intensity and color, the forward current for flowing through each LED is persistently consistent, thus hue coordinate will not deviate.Pass through electricity
The adjusting of stream not only can achieve the purpose of light modulation, but also will not act on behalf of coordinate shift.Therefore developing constant current driving skill at present
Art, but the circuit of constant current driving is high with respect to constant voltage drive circuit complexity, and mainly low pressure applications；If it is application
In terms of high pressure, then have to need high-voltage constant-current circuit using the concatenated scheme of plurality of LEDs lamps and lanterns, and to guarantee LED perseverance
Current circuit securely and reliably works, and has the electric current that guarantee to flow through every string LED identical, thus mentions to the constant current of high-voltage LED device
Requirements at the higher level are gone out.
There are also companies to release application scheme, but is suitable only for the application of low pressure mostly.Because answering low pressure
It is not easy to go wrong with LED lamp, technical difficulty is smaller；It is required because of the LED lamp of different capacity for high-voltage applications
Its electric current flowed through is not quite similar, and when such as multiple LED lamps are connected, because of the unstability of electric current, causes the dissipation work of LED lamp
The case where rate becomes larger, and burns out LED lamp is also frequent occurrence.
Summary of the invention
High voltage direct current centrally connected power supply mode power is used technical problem to be solved by the invention is to provide a kind of, power supply is defeated
LED light string and constant-current circuit are connect out, and every a string of high-voltage LEDs use independent constant-current circuit constant current, and every group of circuit branch
PWM light modulation is held, the application of the circuit solves conventional low LED power supply and constant-current circuit device cost height, input power factor
Low, the problems such as power-efficient is low, controllability is low high voltage direct current LED constant current circuit.
In order to solve the above technical problems, the present invention provides a kind of high voltage direct current LED constant current circuit, including centrally connected power supply power supply
Device, multiple LED light strings, multiple current regulator diodes, it is characterised in that: connect in each described LED light string one with
Corresponding current regulator diode, the LED light string and the current regulator diode form a branch, and the branch circuit parallel connection is supplied in concentrating
Between the output bus anode and output bus negative terminal of power supply.
Further, the number of the current regulator diode and the number of LED light string are equal, in each LED light string
LED light number it is all equal, each LED lamp in the LED light string is high-voltage LED lamps and lanterns.
Further, the high voltage direct current LED constant current circuit include first voltage detection control circuit, LED light string I with
First constant-current circuit, the voltage detecting and controling circuit include voltage detecting and controling circuit triode V2, the first divider resistance R1
With the second divider resistance R3, one end of two divider resistances connects the base stage of voltage detecting and controling circuit triode V2 simultaneously, the
The other end of one divider resistance R1 connects the negative terminal of the LED light string I, and the other end connection power supply of the second divider resistance R3 is born
Pole, the collector that first voltage detects control circuit triode V2 connect the grid of the first constant-current circuit metal-oxide-semiconductor V1, first voltage
The emitter of detection control circuit triode V2 connects the negative terminal of the LED light string I, and first constant-current circuit includes first permanent
Current circuit metal-oxide-semiconductor V1, a first current-limiting resistance R2, a first current sense resistor R4 and three pole of the first constant-current circuit
The drain electrode of pipe V3, the first constant-current circuit metal-oxide-semiconductor V1 connect the negative terminal of the first LED light string with one end of the first current-limiting resistance R2, the
The source electrode of one constant-current circuit metal-oxide-semiconductor V1 and one end of the first current sense resistor R4 connect the first constant-current circuit triode V3 simultaneously
Base stage, the emitter of the other end of the first current sense resistor R2 and the first constant-current circuit triode V3 is connected to the negative of power supply
Pole, the grid of the first constant-current circuit metal-oxide-semiconductor V1 connect the other end of the first current-limiting resistance R2, first voltage detection control electricity simultaneously
The collector of the collector of road triode V2 and the first constant-current circuit triode V3.
Compared with prior art, the invention has the benefit that
1, the present invention uses high voltage direct current centrally connected power supply mode power, and power supply output connects LED light string and constant-current circuit, and each
High-voltage LED of going here and there uses independent constant-current circuit constant current, and every group of circuit supports PWM light modulation, the application of the circuit to solve biography
It unites low-voltage LED power supply and constant-current circuit device this height, the problems such as input power factor is low, power-efficient is low, controllability is low.
2, every a string of LED of the invention use independent constant-current circuit, and LED light source is mutually indepedent, appointing in any a string
LED failure of anticipating all will not influence the normal work of other strings LED；And circuit provided by the invention can be supported far
Distance Transmission, HVDC Transmission pressure drop is relatively low, both ensure that the reliability that lamps and lanterns use, and meets outdoor remote biography
The illumination application system of defeated power supply.
Detailed description of the invention
Fig. 1 is the structural block diagram of the LED constant current circuit of embodiment provided by the present invention.
Fig. 2 is electrical block diagram of the invention.
Figure label:
1- centrally connected power supply power supply device 2-LED lamp string I 3-LED lamp string II
4-LED lamp string III 22- current regulator diode I 33- current regulator diode II
44- current regulator diode III.
Specific embodiment
Presently preferred embodiments of the present invention is elaborated in conjunction with attached drawing below, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, apparent explicitly be defined to be made to protection scope of the present invention.
It is shown in Figure 1, a kind of high voltage direct current LED constant current circuit, including centrally connected power supply power supply device 1, LED light string I2,
LED light string II3, LED light string III4, current regulator diode I22, current regulator diode II33, current regulator diode III44, the LED light
The I2 and current regulator diode I22 that goes here and there connects, and forms the first branch；LED light string II3 and current regulator diode II33 series connection, composition second
Branch；Current regulator diode II33 and current regulator diode III44 series connection, forms third branch；The first branch, second branch,
Third branch circuit parallel connection is between the output bus anode and output bus negative terminal of centrally connected power supply power supply device 1.
Circuit connection structure of the invention are as follows: a kind of shown in Figure 2, high voltage direct current LED constant current circuit, the high straightening
Stream LED constant current circuit includes first voltage detection control circuit, LED light string I and the first constant-current circuit, the voltage detecting control
Circuit includes voltage detecting and controling circuit triode V2, the first divider resistance R1 and the second divider resistance R3, two divider resistances
One end connect the base stage of voltage detecting and controling circuit triode V2 simultaneously, described in the other end connection of the first divider resistance R1
The negative terminal of LED light string I, the cathode of the other end connection power supply of the second divider resistance R3, first voltage detect three pole of control circuit
The collector of pipe V2 connects the grid of the first constant-current circuit metal-oxide-semiconductor V1, and first voltage detects the transmitting of control circuit triode V2
Pole connects the negative terminal of the LED light string I, and first constant-current circuit includes the first constant-current circuit metal-oxide-semiconductor V1, first current limliting
Resistance R2, a first current sense resistor R4 and a first constant-current circuit triode V3, the first constant-current circuit metal-oxide-semiconductor V1's
Drain electrode connects the negative terminal of the first LED light string with one end of the first current-limiting resistance R2, the source electrode of the first constant-current circuit metal-oxide-semiconductor V1 and the
One end of one current sense resistor R4 connects the base stage of the first constant-current circuit triode V3 simultaneously, the first current sense resistor R2's
The emitter of the other end and the first constant-current circuit triode V3 are connected to the cathode of power supply, the grid of the first constant-current circuit metal-oxide-semiconductor V1
It is permanent that pole connects the other end of the first current-limiting resistance R2, the collector of first voltage detection control circuit triode V2 and first simultaneously
The collector of current circuit triode V3.
Shown in sum up, the present invention uses high voltage direct current centrally connected power supply mode power, and power supply output connects LED light string and Constant Electric Current
Road, and every a string of high-voltage LEDs use independent constant-current circuit constant current, and every group of circuit supports PWM light modulation, and which answers
With solving, conventional low LED power supply and constant-current circuit device cost height, input power factor is low, power-efficient is low, controllability
The problems such as low.
The foregoing is merely better embodiment of the invention, protection scope of the present invention is not with above embodiment
Limit, as long as those of ordinary skill in the art's equivalent modification or variation made by disclosure according to the present invention, should all be included in power
In the protection scope recorded in sharp claim.
Claims (3)
1. a kind of high voltage direct current LED constant current circuit, including centrally connected power supply power supply device, multiple LED light strings, two pole of multiple constant currents
Pipe, it is characterised in that: corresponding current regulator diode of connecting in each described LED light string, the LED light string with
The current regulator diode forms a branch, and the branch circuit parallel connection is in the output bus anode of centrally connected power supply power supply device and output
Between bus negative terminal.
2. high voltage direct current LED constant current circuit according to claim 1, it is characterised in that: the number of the current regulator diode
Equal with the number of LED light string, the LED light number in each LED light string is equal, each of described LED light string
LED lamp is high-voltage LED lamps and lanterns.
3. a kind of high voltage direct current LED constant current circuit according to claim 1, it is characterised in that: the high voltage direct current LED
Constant-current circuit includes first voltage detection control circuit, LED light string I and the first constant-current circuit, the voltage detecting and controling circuit
Including voltage detecting and controling circuit triode V2, the first divider resistance R1 and the second divider resistance R3, the one of two divider resistances
The other end of end while the base stage for connecting voltage detecting and controling circuit triode V2, the first divider resistance R1 connects the LED light
The negative terminal of string I, the cathode of the other end connection power supply of the second divider resistance R3, first voltage detect control circuit triode V2's
Collector connects the grid of the first constant-current circuit metal-oxide-semiconductor V1, and first voltage detects the emitter connection of control circuit triode V2
The negative terminal of the LED light string I, first constant-current circuit include the first constant-current circuit metal-oxide-semiconductor V1, first current-limiting resistance
R2, a first current sense resistor R4 and a first constant-current circuit triode V3, the drain electrode of the first constant-current circuit metal-oxide-semiconductor V1
The negative terminal of the first LED light string, the source electrode of the first constant-current circuit metal-oxide-semiconductor V1 and the first electricity are connected with one end of the first current-limiting resistance R2
The one end for flowing detection resistance R4 connects the base stage of the first constant-current circuit triode V3 simultaneously, and the first current sense resistor R2's is another
The emitter of end and the first constant-current circuit triode V3 are connected to the cathode of power supply, and the grid of the first constant-current circuit metal-oxide-semiconductor V1 is same
When connect the first current-limiting resistance R2 the other end, first voltage detection control circuit triode V2 collector and the first Constant Electric Current
The collector of road triode V3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710874219.8A CN109561532A (en) | 2017-09-25 | 2017-09-25 | A kind of high voltage direct current LED constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710874219.8A CN109561532A (en) | 2017-09-25 | 2017-09-25 | A kind of high voltage direct current LED constant current circuit |
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| Publication Number | Publication Date |
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| CN109561532A true CN109561532A (en) | 2019-04-02 |
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| CN201710874219.8A Pending CN109561532A (en) | 2017-09-25 | 2017-09-25 | A kind of high voltage direct current LED constant current circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110234189A (en) * | 2019-06-04 | 2019-09-13 | 浙江阳光美加照明有限公司 | An a kind of LED cluster of lamps, ornamental for perseverance brightness |
-
2017
- 2017-09-25 CN CN201710874219.8A patent/CN109561532A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110234189A (en) * | 2019-06-04 | 2019-09-13 | 浙江阳光美加照明有限公司 | An a kind of LED cluster of lamps, ornamental for perseverance brightness |
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