CN210431983U

CN210431983U - LED linear constant current driving circuit for inhibiting light attenuation

Info

Publication number: CN210431983U
Application number: CN201921295240.3U
Authority: CN
Inventors: 梁锡武; 梁洪波; 刘强
Original assignee: SHENZHEN ANTUOSHAN TECHNOLOGY CO LTD
Current assignee: SHENZHEN ANTUOSHAN TECHNOLOGY CO LTD
Priority date: 2019-08-05
Filing date: 2019-08-05
Publication date: 2020-04-28
Anticipated expiration: 2029-08-05

Abstract

The utility model discloses a LED linear constant current drive circuit for inhibiting light attenuation, which comprises an alternating current input end, a first protection module, a rectification module, an LED lamp group, a drive module and a second protection module; the alternating current input end is connected with the first protection module, alternating current is accessed through the alternating current input end and enters the first protection module, and the first protection module is connected with the rectification module; the rectification module is connected with the LED lamp group and converts alternating current into direct current to be transmitted to the input end of the LED lamp group; the output end of the LED lamp group is connected with the driving module through the second protection module, and the driving module is used for controlling the LED lamp group to emit light; the LED banks are more than 2 groups, include the LED lamp pearl that concatenates more than 2 in every LED banks, and each group LED lamp pearl is between the parallel connection. The circuit is connected in parallel with a plurality of groups of electrifying loops which are connected in series with the same number of LED lamp beads during electrifying output, so that the luminous efficiency of the whole lamp is improved under the condition that the power of the whole lamp is not changed, and the luminous flux of the whole lamp is increased.

Description

LED linear constant current driving circuit for inhibiting light attenuation

Technical Field

The utility model belongs to the technical field of the LED drive, in particular to can carry out the linear constant current drive circuit that many concatenation LED lamp pearl cluster number maintain lumen value, improve luminous efficiency and restrain light decay and control method thereof.

Background

The traditional LED linear constant current control circuit adopts a constant current source, the anode of an LED lamp string is connected with the positive output end of a rectifier bridge, the cathode of the LED lamp string is connected with one end of the constant current source, and the other end of the constant current source is grounded.

The linear constant current driving circuit is basically formed by connecting a plurality of LED lamp beads in series in a plurality of circuits such as 3 sections, 4 sections, 5 sections and the like, and the LED lamp beads on each section of string are driven to emit light by voltage output after being electrified. However, when each section of the linear constant current driving circuit is powered on and output, only one power-on loop of one group of LED lamp beads connected in series is needed, the light efficiency of the whole lamp is insufficient, the light-emitting time is short, the lumen value, namely the luminous flux is easy to rapidly decrease, and the light attenuation is generated.

The light decay generally refers to the luminous flux, and when the surface of the photosensitive drum is charged, the potential continuously rises along with the accumulation of charges on the surface of the photosensitive drum, and finally reaches the "saturation" potential, namely the highest potential. The surface potential will decrease with time, and the potential is generally lower than this potential during operation, and this process of the potential naturally decreasing with time is called "dark decay" process. When the photosensitive drum is exposed by scanning, the potential of the dark area is still in the dark decay process; the carrier density in the photoconductive layer in the bright area is rapidly increased, the conductivity is rapidly increased to form photoconductive voltage, the charge is rapidly disappeared, and the surface potential of the photoconductor is also rapidly reduced. This is called "light decay" and eventually slows down.

Patent 201820860115.1 discloses a multistage overcurrent self-resuming lamp area, including rectifier bridge DB1, high-pressure lamp pearl, constant current chip U1, sampling resistor R and self-resuming insurance resistance F, wherein, 3 connect the alternating current zero line of pin of rectifier bridge DB1, 1 of pin of rectifier bridge DB1 connects the alternating current live wire, rectifier bridge DB1 pin 2 with self-resuming insurance resistance F, high-pressure lamp pearl connect in after establishing ties in pin 1 of constant current chip U1, rectifier bridge DB1 pin 4 connect in pin 2 and pin 9 of constant current chip U1, sampling resistor R connect in between pin 4 of rectifier bridge DB1, pin 4 of constant current chip U1. The utility model has the advantages that: the problem of the shaking and flashing of naked eyes is solved.

However, the multi-section overcurrent self-recovery lamp strip only has one group of power-on loops connected in series with a plurality of LED lamp beads, the whole lamp has insufficient lighting effect, short lighting time and lumen value, namely, luminous flux is easy to rapidly decrease to generate light attenuation.

Disclosure of Invention

In order to solve the above problem, an object of the present invention is to provide a linear constant current driving circuit of LED for suppressing light decay, which connects a plurality of groups in series with the power-on loop of the same number of LED lamp beads when the circuit outputs power-on, so that the light efficiency of the whole lamp is improved and the luminous flux of the whole lamp is increased under the condition of unchanged power of the whole lamp.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

an LED linear constant current driving circuit for inhibiting light decay comprises an alternating current input end, a first protection module, a rectification module, an LED lamp group, a driving module and a second protection module; the alternating current input end is connected with the first protection module, alternating current is accessed through the alternating current input end and enters the first protection module, the first protection module is connected with the rectification module, and the first protection module transmits stable alternating current to the rectification module; the rectification module is connected with the LED lamp group and converts alternating current into direct current to be transmitted to the input end of the LED lamp group; the output end of the LED lamp group is connected with a driving module through a second protection module, and the driving module is used for controlling the LED lamp group to emit light; the LED lamp bank is more than 2 groups, LED lamp beads which are more than 2 connected in series are included in each LED lamp bank, and each group of LED lamp beads are connected in parallel. The utility model discloses in, this circuit connects the circular telegram return circuit of multiunit concatenation with several LED lamp pearls when through circular telegram output, this is an effectual connected mode that increases the whole lamp light efficiency of LED lamps and lanterns, this kind of circular telegram return circuit parallel connection mode, linear constant current drive circuit power does not change, only the circular telegram return circuit of a set of same several LED lamp pearls of concatenation more, the electric current that the LED lamp pearl in this circular telegram return circuit passes through merges the distribution with the electric current that the circular telegram return circuit of former a set of same several LED lamp pearls passes through, the electric current sum of the circular telegram return circuit of two sets of LED lamp pearls is the electric current of this section output, under the unchangeable condition of power at whole lamps and lanterns, whole lamp light efficiency improves to some extent, whole lamp.

Furthermore, the alternating current input end comprises a zero line end and a fire line end, the first protection module comprises a fuse and a piezoresistor, the zero line end is connected with one end of the fuse, the other end of the fuse is connected with one end of the piezoresistor, and the other end of the piezoresistor is connected with the fire line end. In the utility model, the first protection module is arranged to improve the safety and reliability of the circuit, and avoid the damage of the circuit caused by the voltage or current mixed with destructive impurities in the alternating current in the circuit, for example, when the alternating current jumps or surges are input and exceed the range born by the protection module, the fuse can be fused to isolate the input of the alternating current, thereby protecting the rectifier module from being damaged; and because of the non-volt-ampere characteristic of the piezoresistor, the piezoresistor is designed in the protection module, and when the input alternating voltage rises suddenly, the resistance of the piezoresistor increases along with the increase of the input voltage for the protection circuit, so that the protection effect is achieved.

Furthermore, the rectifying module comprises a rectifying IC and a filter circuit, the filter circuit comprises a first filter capacitor, a second filter capacitor, a first pull-down resistor, a first divider resistor and a second divider resistor, the rectifying IC comprises 4 pins, pin 1 and pin 2 of the rectifying IC are respectively connected with two ends of the voltage dependent resistor, pin 3 and pin 4 of the rectifying IC are respectively connected with two ends of the first filter capacitor, the second filter capacitor is connected with the first filter capacitor in parallel, two ends of the second filter capacitor are respectively connected with pin 3 and pin 4 of the rectifying IC, one end of the first pull-down resistor is connected with pin 4 of the rectifying IC and is connected between the first filter capacitor and the second filter capacitor in series, the other end of the first pull-down resistor is grounded, one end of the first divider resistor is connected with pin 3 of the rectifying IC, the other end of the first divider resistor is connected with one end of the second divider resistor, the other end of the second voltage-dividing resistor is connected with the driving module. The utility model discloses in, rectifier IC is used for changing alternating current into direct current, and first filter capacitor and second filter capacitor play the filtering action, make the direct current of output more level and smooth, because the alternating current is changed into direct current output back through rectifier IC, generally can not hundred percent obtain the voltage that does not have the clutter in practice, in order to get rid of the clutter as far as possible, consequently connect first filter capacitor and second filter capacitor at rectifier IC's output; the first pull-down resistor can pull the level of a node between the first filter capacitor and the second filter capacitor to the low direction, a fixed level is provided for a circuit when the circuit driver is closed, and the first voltage dividing resistor and the second voltage dividing resistor have the function of voltage division, so that the voltage at two ends of the filter circuit is reduced.

Further, the model of the rectifying IC is GBU 410. The utility model discloses in, the model is GBU 410's rectification ICDB1 can be with alternating current conversion to direct current, can the work of continuous stable efficient to the in-process of long-time work can not generate heat, has high withstand voltage's characteristic moreover.

Further, the driving module includes a driving chip and an adjusting circuit, the driving chip includes 16 pins, which are respectively a VS terminal, a CP terminal, a BRO terminal, a VCC terminal, a COM terminal, a DIM terminal, a GND terminal, a CS terminal, a GD1 terminal, a GD2 terminal, a GD3 terminal, a GD4 terminal, a GD5 terminal, an ST terminal, and 2 NC terminals, the adjusting circuit includes a brightness control port, a third filter capacitor, a fourth filter capacitor, a fifth filter capacitor, a de-noising capacitor, a loop compensation capacitor, a first current limiting resistor, a second current limiting resistor, a third current limiting resistor, a clamping resistor, and a second pull-down resistor, and the brightness control port includes a port 1 and a port 2;

the other end of the second voltage-dividing resistor is connected with the CP end, one end of the first current-limiting resistor is connected with the CP end, the other end of the first current-limiting resistor is grounded, the third filter capacitor is connected with the two ends of the first current-limiting resistor in parallel, one end of the clamping resistor is connected with the BRO end, the other end of the clamping resistor is connected with the VCC end, one end of the denoising capacitor is connected with the BRO end, the other end of the denoising capacitor is grounded, one end of the fourth filter capacitor is connected with the clamping resistor and is positioned between the clamping resistor and the VCC end, the other end of the fourth filter capacitor is grounded, one end of the loop compensation capacitor is connected with the COM end, the other end of the loop compensation capacitor is grounded, one end of the second current-limiting resistor is connected with the VCC end, the other end of the second current-limiting resistor is connected with the port 2 of the brightness control port, one end of the third current-limiting resistor, one end of the second pull-down resistor is connected with the DIM end and is connected to a node between the third current-limiting resistor and the DIM end, the other end of the second pull-down resistor is connected with the port 1 of the brightness control port and is connected with the GND end, the GND end is grounded, and the fifth filter capacitor is connected to two ends of the second pull-down resistor in parallel.

In the utility model, the brightness control port can change the output current in turn according to the on/off control switch in the application of switch sectional brightness adjustment, thereby changing the brightness of the LED lamp, the VS end of the driving chip is the commercial power voltage detection end, the CP is the constant current/constant power compensation setting end, and when being connected to the VS end, the constant power mode is realized; when the voltage regulator is connected to a GND end, the voltage regulator is in a constant current mode, a BRO end is a commercial power under-voltage protection end, the interior of the BRO end is stabilized at 5.75V, a 1uF denoising capacitor is required to be connected to remove noise, a COM end is a loop compensation end, a 0.22uF loop compensation capacitor is required to be connected to the ground, the interior of the COM voltage is clamped to be not more than the BRO voltage, a DIM end is a dimming end and is more than 2.5V, the output current is 100% and less than 0.2V, the output current is 0% and is connected to VCC when not in use, the GND end is grounded, a CS end is a current detection end, a GD1 end-GD 5 end is an external MOSFET driving end, an ST end is a high-voltage; the third filter capacitor, the fourth filter capacitor and the fifth filter capacitor play a role in filtering, so that output direct current is smoother, the first current limiting resistor, the second current limiting resistor and the third current limiting resistor are used for limiting the magnitude of current of a branch in which the current is located, so that components connected in series are prevented from being burnt due to overlarge current, a voltage division function can be realized, the second pull-down resistor can pull the level of a node between the third current limiting resistor and a DIM end in a low direction, and a fixed level is supplied to a circuit when a circuit driver is closed; through the arrangement, the LED groups can be driven to emit light and adjust the brightness.

Further, the model of the driving chip is L1050. The utility model discloses in, the driver chip who adopts the model to be L1050 is a section high power factor, the linear constant current drive scheme of low harmonic current, adopt the segmentation on-state control mode, drive external MOSFET, control LED draws smoothly from the commercial power, sinusoidal shape's electric current, make the actuating system based on L1050 have higher power factor, lower harmonic current and lower electromagnetism are disturbed, satisfy each district's authentication demand easily, and the circuit is simple, low cost, according to the demand of difference, L1050 can set up the constant current mode in order to maintain LED lighting apparatus's luminous flux, also can set up the constant power mode, it is invariable to maintain commercial power input power, and reduce the temperature of LED lighting apparatus when the commercial power risees.

Further, the second protection module includes a sixth filter capacitor, a seventh filter capacitor, an eighth filter capacitor, a ninth filter capacitor, a tenth filter capacitor, an eleventh filter capacitor, a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a fifth MOS transistor, a sixth MOS transistor, a seventh MOS transistor, an eighth MOS transistor, a ninth MOS transistor, a fourth current-limiting resistor, a fifth current-limiting resistor, a sixth current-limiting resistor, a seventh current-limiting resistor, an eighth current-limiting resistor, a ninth current-limiting resistor, a tenth current-limiting resistor, an eleventh current-limiting resistor, and a twelfth current-limiting resistor;

one end of the sixth filter capacitor is connected with the ST end, the other end of the sixth filter capacitor is grounded, one end of the fourth current-limiting resistor is connected with the sixth filter capacitor, and the other end of the fourth current-limiting resistor is connected with the input end of the LED lamp bank; one end of the seventh filter capacitor is connected with the drain electrode of the first MOS tube, the other end of the seventh filter capacitor is grounded, the grid electrode of the first MOS tube is connected with the GD1 end, the source electrode of the first MOS tube is connected with one end of the fifth current-limiting resistor, and the other end of the fifth current-limiting resistor is connected with the CS end; one end of the eighth filter capacitor is connected with the drain electrode of the second MOS tube, the other end of the eighth filter capacitor is grounded, the grid electrode of the second MOS tube is connected with the GD2 end, the source electrode of the second MOS tube is connected with one end of the sixth current-limiting resistor, and the other end of the sixth current-limiting resistor is connected with the CS end; one end of the ninth filter capacitor is connected with the drain electrode of the third MOS tube, the other end of the ninth filter capacitor is grounded, the grid electrode of the third MOS tube is connected with the GD3 end, and the source electrode of the third MOS tube is connected with the CS end; and the drain electrodes of the fourth MOS tube and the fifth MOS tube are connected with one end of a tenth filter capacitor. The other end of the tenth filter capacitor is grounded, the gates of the fourth MOS transistor and the fifth MOS transistor are both connected with the GD4 end, the source of the fourth MOS transistor is connected with one end of a seventh current-limiting resistor, the other end of the seventh current-limiting resistor is connected with the CS end, the source of the fifth MOS transistor is connected with an eighth current-limiting resistor, and the other end of the eighth current-limiting resistor is connected with the CS end; the drain electrodes of the sixth MOS tube, the seventh MOS tube, the eighth MOS tube and the ninth MOS tube are all connected with one end of an eleventh filter capacitor, the other end of the eleventh filter capacitor is grounded, the grids of the sixth MOS tube, the seventh MOS tube, the eighth MOS tube and the ninth MOS tube are all connected with the GD5 end, the source electrode of the sixth MOS tube is connected with a ninth current-limiting resistor, the other end of the ninth current-limiting resistor is connected with the CS end, the source electrode of the seventh MOS tube is connected with a tenth current-limiting resistor, the other end of the tenth current-limiting resistor is connected with the CS end, the source electrode of the eighth MOS tube is connected with an eleventh current-limiting resistor, the other end of the eleventh current-limiting resistor is connected with the CS end, the source electrode of the ninth MOS tube is connected with a twelfth current-limiting resistor, and the other end of the twelfth current-limiting resistor is connected with the CS end. The utility model discloses in, sixth filter capacitor, seventh filter capacitor, eighth filter capacitor, ninth filter capacitor, tenth filter capacitor, eleventh filter capacitor plays the filtering action, drive chip is through controlling the LED lamp that first MOS pipe switching GD1 end drive, through controlling the LED lamp that second MOS pipe switching GD2 end drive, through controlling the LED lamp that third MOS pipe switching GD3 end drive, through controlling the LED lamp that fourth MOS pipe and fifth MOS pipe switching GD4 end drive, through controlling sixth MOS pipe, seventh MOS pipe and eighth MOS pipe switching GD5 end drive LED lamp; and the fourth current-limiting resistor, the fifth current-limiting resistor, the sixth current-limiting resistor, the seventh current-limiting resistor, the eighth current-limiting resistor, the ninth current-limiting resistor, the tenth current-limiting resistor, the eleventh current-limiting resistor and the twelfth current-limiting resistor are used for limiting the current resistors and preventing the CS end from being burnt.

Furthermore, the second protection module further comprises a third pull-down resistor and a fourth pull-down resistor, one end of the third pull-down resistor is connected with a sixth current-limiting resistor and is located between the sixth current-limiting resistor and the CS end, and the other end of the third pull-down resistor is grounded; one end of a fourth pull-down resistor is connected with the source electrode of the third MOS tube and is positioned between the source electrode of the third MOS tube and the CS end, and the other end of the fourth pull-down resistor is grounded. The utility model discloses in, the third pull down resistance is the grid of MOS pipe when the low level with the effect of fourth pull down resistance, and the source electrode is restricted to the low level.

Furthermore, the LED lamp group comprises a first circuit, a second circuit, a third circuit, a fourth circuit and a fifth circuit, wherein the first circuit, the second circuit, the third circuit, the fourth circuit and the fifth circuit respectively comprise more than 2 groups of LED lamp bead strings, each group of LED lamp bead string comprises more than 2 LED lamp beads connected in series, each group of LED lamp bead strings are connected in parallel, the number of the lamp beads in each group of LED lamp bead strings is equal, the input ends of the first circuit, the second circuit, the third circuit, the fourth circuit and the fifth circuit are connected with a rectifier module, the output end of the first circuit is connected with the drain electrode of the first MOS tube, the output end of the second circuit is connected with the drain electrode of the second MOS tube, the output end of the third circuit is connected with the drain electrode of the third MOS tube, the output end of the fourth circuit is connected with the drain electrodes of the fourth MOS tube and the fifth MOS tube, the output end of the fifth section of circuit is connected with the drain electrodes of the sixth MOS tube, the seventh MOS tube and the eighth MOS tube. The utility model discloses in, through the aforesaid setting, make driver chip through the LED lamp pearl of the first section circuit of control first MOS pipe switching GD1 end driven, LED lamp pearl through controlling second MOS pipe switching GD2 end driven second section circuit, LED lamp pearl through controlling third MOS pipe switching GD3 end driven third section circuit, LED lamp pearl through controlling fourth MOS pipe and fifth MOS pipe switching GD4 end driven fourth section circuit, through controlling sixth MOS pipe, the LED lamp pearl of seventh MOS pipe and eighth MOS pipe switching GD5 end driven fifth section circuit.

The utility model has the advantages that:

compared with the prior art, the utility model provides a restrain linear constant current drive circuit of LED of light decay, when this circuit passes through the circular telegram output, and the multiunit concatenates the circular telegram return circuit with a number LED lamp pearl, this is an effectual connected mode who increases the whole lamp light efficiency of LED lamps and lanterns, this kind of circular telegram return circuit parallel mode, linear constant current drive circuit power does not change, only splice a set of circular telegram return circuit with a number LED lamp pearl more, the electric current that the LED lamp pearl in this circular telegram return circuit passes through and the current merging distribution that the circular telegram return circuit of former a set of same number LED lamp pearl passes through, the electric current sum of the circular telegram return circuit of two sets of LED lamp pearls is exactly the electric current of this section output, under the unchangeable condition of whole lamps and lanterns power, whole lamp light efficiency improves to some extent, whole lamp luminous.

Drawings

Fig. 1 is a schematic circuit diagram of an LED linear constant current driving circuit for suppressing light attenuation according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The technical scheme of the utility model as follows:

referring to fig. 1, the present invention provides a linear constant current driving circuit for LED, which includes an ac input terminal J1, a first protection module, a rectification module, an LED lamp set, a driving module, and a second protection module; the alternating current input end J1 is connected with the first protection module, alternating current is accessed through the alternating current input end J1 and enters the first protection module, the first protection module is connected with the rectification module, and the first protection module transmits stable alternating current to the rectification module; the rectification module is connected with the LED lamp group and converts alternating current into direct current to be transmitted to the input end of the LED lamp group; the output end of the LED lamp group is connected with the driving module through the second protection module, and the driving module is used for controlling the LED lamp group to emit light; the LED banks are more than 2 groups, include the LED lamp pearl that concatenates more than 2 in every LED banks, and each group LED lamp pearl is between the parallel connection. The utility model discloses in, this circuit connects the circular telegram return circuit of multiunit concatenation with several LED lamp pearls when through circular telegram output, this is an effectual connected mode that increases the whole lamp light efficiency of LED lamps and lanterns, this kind of circular telegram return circuit parallel connection mode, linear constant current drive circuit power does not change, only the circular telegram return circuit of a set of same several LED lamp pearls of concatenation more, the electric current that the LED lamp pearl in this circular telegram return circuit passes through merges the distribution with the electric current that the circular telegram return circuit of former a set of same several LED lamp pearls passes through, the electric current sum of the circular telegram return circuit of two sets of LED lamp pearls is the electric current of this section output, under the unchangeable condition of power at whole lamps and lanterns, whole lamp light efficiency improves to some extent, whole lamp.

In this embodiment, the ac power input terminal J1 includes a neutral terminal N and a live terminal L, the first protection module includes a fuse F1 and a varistor MOV1, the neutral terminal N is connected to one end of the fuse F1, the other end of the fuse F1 is connected to one end of the varistor MOV1, and the other end of the varistor MOV1 is connected to the live terminal L. In the utility model, the first protection module is arranged to improve the safety and reliability of the circuit, and avoid the damage of the circuit caused by the voltage or current mixed with destructive impurities in the alternating current entering the circuit, for example, when the alternating current jumps or surges are input and exceed the range born by the protection module, the fuse F1 can be fused to isolate the input of the alternating current, thereby protecting the rectifier module from being damaged; and because of the non-volt-ampere characteristic of the voltage dependent resistor MOV1, the voltage dependent resistor MOV1 is designed in the protection module, and when the input alternating current voltage rises suddenly, the resistance of the voltage dependent resistor MOV1 increases along with the increase of the input voltage, so that the protection function is achieved.

In this embodiment, the rectifying module includes a rectifying IC DB1 and a filter circuit, the filter circuit includes a first filter capacitor C1, a second filter capacitor C9, a first pull-down resistor R21, a first pull-down resistor R1 and a second pull-down resistor R2, the rectifying IC DB1 includes 4 pins, pin 1 and pin 2 of the rectifying IC DB1 are respectively connected to two ends of the varistor MOV1, pin 3 and pin 4 of the rectifying IC DB1 are respectively connected to two ends of the first filter capacitor C1, the second filter capacitor C9 is connected in parallel with the first filter capacitor C1, two ends of the second filter capacitor C9 are respectively connected to pin 3 and pin 4 of the rectifying IC DB1, one end of the first pull-down resistor R21 is connected to pin 4 of the rectifying IC DB1 and is connected in series between the first filter capacitor C1 and the second filter capacitor C9, the other end of the first pull-down resistor R5 is grounded, and one end of the first pull-down resistor R583 is connected to the rectifying IC DB 5733, the other end of the first pull-down resistor R1 is connected with one end of the second pull-down resistor R2, and the other end of the second pull-down resistor R2 is connected with the driving module. In the utility model discloses in, rectification IC DB1 is used for changing the alternating current into the direct current, and first filter capacitor C1 and second filter capacitor C9 play the filtering action, make the direct current of output more level and smooth, because the alternating current is changed into direct current output back through rectification IC DB1, generally can not hundred percent obtain the voltage of no clutter in the reality, in order to get rid of the clutter as far as possible, consequently connect first filter capacitor C1 and second filter capacitor C9 at rectification IC DB 1's output; the first pull-down resistor R21 can pull the level of the node between the first filter capacitor C1 and the second filter capacitor C9 to the low direction, a fixed level is provided for the circuit when the circuit driver is closed, and the first pull-down resistor R1 and the second pull-down resistor R2 play a role in voltage division, so that the voltage at two ends of the filter circuit is reduced.

In the present embodiment, the model of the rectifying IC DB1 is GBU 410. The utility model discloses in, the model is GBU 410's rectification IC DB1 DB1 can be with alternating current conversion to direct current, can the work of continuous stable efficient to the in-process of long-time work can not generate heat, has high withstand voltage characteristic moreover.

In this embodiment, the driving module includes a driving chip U1 and an adjusting circuit, the driving chip U1 includes 16 pins, which are respectively a VS terminal, a CP terminal, a BRO terminal, a VCC terminal, a COM terminal, a DIM terminal, a GND terminal, a CS terminal, a GD1 terminal, a GD2 terminal, a GD3 terminal, a GD4 terminal, a GD5 terminal, an ST terminal, and 2 NC terminals, the adjusting circuit includes a brightness control port J2, a third filter capacitor C2, a fourth filter capacitor C4, a fifth filter capacitor C8, a denoising capacitor C3, a loop compensation capacitor C5, a first current limiting resistor R3, a second current limiting resistor R11, a third current limiting resistor R7 clamp, a resistor R4, and a second pull-down resistor R8, and the brightness control port J2 includes a port 1 and a port 2;

the other end of the second pull-down resistor R8 is connected with the CP terminal, one end of the first current-limiting resistor R3 is connected with the CP terminal, the other end of the first current-limiting resistor R3 is grounded, the third filter capacitor C2 is connected in parallel with the two ends of the first current-limiting resistor R3, one end of the clamp resistor R4 is connected with the BRO terminal, the other end of the clamp resistor R4 is connected with the VCC terminal, one end of the de-noising capacitor C3 is connected with the BRO terminal, the other end of the de-noising capacitor C3 is grounded, one end of the fourth filter capacitor C4 is connected with the clamp resistor R4 and is positioned between the clamp resistor R4 and the VCC terminal, the other end of the fourth filter capacitor C4 is grounded, one end of the loop compensation capacitor C5 is connected with the COM terminal, the other end of the loop compensation capacitor C5 is grounded, one end of the second current-limiting resistor R588 is connected with the VCC terminal, the other end of the second current-limiting resistor R6 is connected with the luminance control port J2, one end, the other end of the third current-limiting resistor R7 is connected to the DIM end, one end of the second pull-down resistor R8 is connected to the DIM end and to a node between the third current-limiting resistor R7 and the DIM end, the other end of the second pull-down resistor R8 is connected to the port 1 of the brightness control port J2 and to the GND end, which is grounded, and the fifth filter capacitor C8 is connected in parallel to both ends of the second pull-down resistor R8.

In the utility model, the brightness control port J2 can change the output current in turn according to the on/off control switch in the application of switch sectional brightness adjustment, thereby changing the brightness of the LED lamp, the VS end of the driving chip U1 is the commercial power voltage detection end, the CP is the constant current/constant power compensation setting end, and when being connected to the VS end, the constant power mode is adopted; when the voltage regulator is connected to a GND end, the voltage regulator is in a constant current mode, a BRO end is a commercial power under-voltage protection end, the interior of the voltage regulator is stabilized at 5.75V, a 1uF denoising capacitor C3 is required to be connected for removing noise, a COM end is a loop compensation end, a 0.22uF loop compensation capacitor C5 is required to be connected to the ground, the interior of the COM voltage is clamped to be not more than BRO voltage, a DIM end is a dimming end and is more than 2.5V, output current is 100% and less than 0.2V, the output current is 0% and is connected to VCC when not used, the GND end is grounded, a CS end is a current detection end, a GD1 end-GD 5 end is an external MOSFET driving end, an ST end is a high-voltage power supply end and; the third filter capacitor C2, the fourth filter capacitor C4 and the fifth filter capacitor C8 play a role in filtering, so that output direct current is smoother, the first current limiting resistor R3, the second current limiting resistor R11 and the third current limiting resistor R7 are used for limiting the magnitude of current of a branch in which the current is located, so that components connected in series are prevented from being burnt due to overlarge current, and a voltage division function can be achieved, the second pull-down resistor R8 can pull the level of a node between the third current limiting resistor R7 and a DIM end in a low direction, and a fixed level is provided for a circuit when a circuit driver is closed; through the arrangement, the LED groups can be driven to emit light and adjust the brightness.

In the present embodiment, the driver chip U1 has a model number L1050. The utility model discloses in, the driver chip U1 that adopts the model to be L1050 is a section high power factor, the linear constant current drive scheme of low harmonic current, adopt the segmentation on-state control mode, drive external MOSFET, control LED draws smoothly from the commercial power, sinusoidal shape's electric current, make the actuating system based on L1050 have higher power factor, lower harmonic current and lower electromagnetism thousand disturb, satisfy each district's authentication demand easily, and the circuit is simple, low cost, according to the demand of difference, L1050 can set up the luminous flux of constant current mode in order to maintain LED lighting apparatus, also can set up into the constant power mode, it is invariable to maintain commercial power input power, and reduce the temperature of LED lighting apparatus when the commercial power risees.

In this embodiment, the second protection module includes a sixth filtering capacitor C10, a seventh filtering capacitor C6, an eighth filtering capacitor C7, a ninth filtering capacitor C13, a tenth filtering capacitor C11, an eleventh filtering capacitor C14, a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4, a fifth MOS transistor Q5, a sixth MOS transistor Q6, a seventh MOS transistor Q7, an eighth MOS transistor Q8, a ninth MOS transistor Q9, a fourth current-limiting resistor R9, a fifth current-limiting resistor R10, a sixth current-limiting resistor R15, a seventh current-limiting resistor R19, an eighth current-limiting resistor R20, a ninth current-limiting resistor R12, a tenth current-limiting resistor R13, an eleventh current-limiting resistor R14, and a twelfth current-limiting resistor R18;

one end of a sixth filter capacitor C10 is connected with the ST end, the other end of the sixth filter capacitor C10 is grounded, one end of a fourth current-limiting resistor R9 is connected with the sixth filter capacitor C10, and the other end of the fourth current-limiting resistor R9 is connected with the input end of the LED lamp bank; one end of a seventh filter capacitor C6 is connected with the drain electrode of the first MOS tube Q1, the other end of the seventh filter capacitor C6 is grounded, the gate electrode of the first MOS tube Q1 is connected with the GD1 end, the source electrode of the first MOS tube Q1 is connected with one end of a fifth current-limiting resistor R10, and the other end of the fifth current-limiting resistor R10 is connected with the CS end; one end of an eighth filter capacitor C7 is connected with the drain of the second MOS tube Q2, the other end of the eighth filter capacitor C7 is grounded, the gate of the second MOS tube Q2 is connected with the GD2 end, the source of the second MOS tube Q2 is connected with one end of a sixth current-limiting resistor R15, and the other end of the sixth current-limiting resistor R15 is connected with the CS end; one end of a ninth filter capacitor C13 is connected with the drain of the third MOS tube Q3, the other end of the ninth filter capacitor C13 is grounded, the gate of the third MOS tube Q3 is connected with the GD3 end, and the source of the third MOS tube Q3 is connected with the CS end; the drains of the fourth MOS transistor Q4 and the fifth MOS transistor Q5 are both connected to one end of the tenth filter capacitor C11. The other end of the tenth filter capacitor C11 is grounded, the gates of the fourth MOS transistor Q4 and the fifth MOS transistor Q5 are both connected with the GD4 end, the source of the fourth MOS transistor Q4 is connected with one end of a seventh current-limiting resistor R19, the other end of the seventh current-limiting resistor R19 is connected with the CS end, the source of the fifth MOS transistor Q5 is connected with an eighth current-limiting resistor R20, and the other end of the eighth current-limiting resistor R20 is connected with the CS end; drains of the sixth MOS transistor Q6, the seventh MOS transistor Q7, the eighth MOS transistor Q8 and the ninth MOS transistor Q9 are all connected to one end of an eleventh filter capacitor C14, the other end of the eleventh filter capacitor C14 is grounded, gates of the sixth MOS transistor Q6, the seventh MOS transistor Q7, the eighth MOS transistor Q8 and the ninth MOS transistor Q9 are all connected to the GD5 end, a source of the sixth MOS transistor Q6 is connected to the ninth current-limiting resistor R12, the other end of the ninth current-limiting resistor R12 is connected to the CS end, a source of the seventh MOS transistor Q7 is connected to the tenth current-limiting resistor R13, the other end of the tenth current-limiting resistor R13 is connected to the CS end, a source of the eighth MOS transistor Q8 is connected to the eleventh current-limiting resistor R14, the other end of the eleventh current-limiting resistor R14 is connected to the CS end, a source of the ninth MOS transistor Q9 is connected to the twelfth current-limiting resistor R18, and the twelfth current-limiting resistor R18 is connected to the CS end. The utility model discloses in, sixth filter capacitance C10, seventh filter capacitance C6, eighth filter capacitance C7, ninth filter capacitance C13, tenth filter capacitance C11, eleventh filter capacitance C14 plays the filtering action, drive chip U1 is through controlling the LED lamp of first MOS pipe Q1 switching GD1 end drive, through controlling the LED lamp of second MOS pipe Q2 switching GD2 end drive, through controlling the LED lamp of third MOS pipe Q3 switching GD3 end drive, through controlling the LED lamp of fourth MOS pipe Q4 and fifth MOS pipe Q5 switching GD4 end drive, through controlling the LED lamp of sixth MOS pipe Q6, seventh MOS pipe Q7 and eighth MOS pipe Q8 switching GD5 end drive; the fourth current limiting resistor R9, the fifth current limiting resistor R10, the sixth current limiting resistor R15, the seventh current limiting resistor R19, the eighth current limiting resistor R20, the ninth current limiting resistor R12, the tenth current limiting resistor R13, the eleventh current limiting resistor R14 and the twelfth current limiting resistor R18 are used for limiting the current resistors, and the CS end is prevented from being burnt.

In this embodiment, the second protection module further includes a third pull-down resistor and a fourth pull-down resistor, one end of the third pull-down resistor is connected to the sixth current-limiting resistor R15 and is located between the sixth current-limiting resistor R15 and the CS terminal, and the other end of the third pull-down resistor is grounded; one end of the fourth pull-down resistor is connected with the source electrode of the third MOS transistor Q3, and is located between the source electrode of the third MOS transistor Q3 and the CS terminal, and the other end of the fourth pull-down resistor is grounded. The utility model discloses in, the third pull down resistance is the grid of MOS pipe when the low level with the effect of fourth pull down resistance, and the source electrode is restricted to the low level.

In this embodiment, the LED lamp group includes a first stage circuit HV-L1, a second stage circuit L1-L2, a third stage circuit L2-L3, a fourth stage circuit L3-L4 and a fifth stage circuit L4-HV, the first stage circuit HV-L1, the second stage circuit L1-L2, the third stage circuit L2-L3, the fourth stage circuit L3-L4 and the fifth stage circuit L4-HV all include more than 2 groups of LED lamp bead strings, each group of LED lamp bead strings includes more than 2 serially connected LED lamp beads, each group of HV lamp bead strings are connected in parallel, and the number of lamp beads in each group of LED lamp bead strings is equal, the first stage circuit HV-L1, the second stage circuit L1-L2, the third stage circuit L2-L3, the fourth stage circuit L3-L4 and the input end of the fifth stage circuit L4-HV are connected with the first stage circuit L1, and the output end of the MOS 1 is connected with the first stage circuit Q-Q1, the output ends of the second-stage circuits L1-L2 are connected with the drain electrode of a second MOS transistor Q2, the output ends of the third-stage circuits L2-L3 are connected with the drain electrode of a third MOS transistor Q3, the output ends of the fourth-stage circuits L3-L4 are connected with the drain electrodes of a fourth MOS transistor Q4 and a fifth MOS transistor Q5, and the output ends of the fifth-stage circuits L4-HV are connected with the drain electrodes of a sixth MOS transistor Q6, a seventh MOS transistor Q7 and an eighth MOS transistor Q8. The utility model discloses in, through above-mentioned setting, make drive chip U1 through the LED lamp pearl of the first section circuit HV-L1 of control first MOS pipe Q1 switching GD1 end drive, through the LED lamp pearl of the second section circuit L1-L2 of control second MOS pipe Q2 switching GD2 end drive, through the LED lamp pearl of the third section circuit L2-L3 of control third MOS pipe Q3 switching GD3 end drive, through the LED lamp pearl of the fourth section circuit L3-L4 of control fourth MOS pipe Q4 and fifth MOS pipe Q5 switching GD4 end drive, through the LED lamp pearl of the sixth MOS pipe Q6 of control, seventh MOS pipe Q7 and the fifth section circuit L4-HV of eighth MOS pipe Q5 switching GD5 end drive.

In a specific embodiment, the optical indicators were tested by energizing 64 of the 3030 light source parameters (60W), tabulated below:

64 pieces 3030 light source parameter electrification test optical index contrast (60W)

Analysis from the data in the table above: each section of circuit of the LED lamp group is connected with a group of energizing circuits (5 sections of HV-L1, L1-L2, L2-L3, L3-L4 and L4-HV) of the same number of LED lamp beads in parallel, the voltage and the current of each section are different values, and the power tested by each section of single module or each section of double modules is a certain value. The luminous flux value and the lamp luminous efficiency value of each section of the single module are smaller than those of each section of the double module. Such as: 4053.45 is less than 4559.05, and 66.37lm/W is less than 74.65 lm/W.

The output power of the power-on loop of each section of circuit connected with a group of LED lamp beads with the same number in parallel is not changed, but the current passing through each LED lamp bead is reduced in half and half, and according to the light-emitting characteristics of the LED lamp beads, the corresponding lumen value emitted by the LED lamp beads is output when the current outputs a certain value, and the current distributed by each LED lamp bead in the section of circuit is average, and the data shows that: the average lumen value emitted by a certain number of LED lamp beads on the string is higher than the lumen value emitted by a single LED lamp bead when the LED lamp bead is electrified.

This indicates that: the lumen value emitted by the LED lamp beads with the same number which are connected in parallel in each section of circuit is larger than the lumen value emitted by the LED lamp beads with the same number which are connected in parallel in each section of circuit. Basically, the reason that the luminous efficiency of the whole lamp is improved and the luminous flux of the whole lamp is increased is explained.

From another angle, the current driven by the LED lamp beads when the LED lamp beads emit light is not the maximum power-on value of the LED lamp beads, the PN junctions in the LED lamp beads have coincident time when positive ions impact with holes in a collision and dislocation mode, the friction generated when the positive ions are combined with the holes is reduced, the chance of generating heat is reduced, the probability of increasing the light-emitting trigger surface is improved, the light-emitting time of the LED lamp beads is long, the lumen value is slowly reduced, the light efficiency value of the LED lamp is maintained within the range of the basic set value, the light attenuation of the LED lamp beads is controlled to be on one reference line, and the light-emitting service life of the LED lamp is prolonged.

Therefore, adopt the utility model discloses a restrain linear constant current drive circuit of LED of light decay can carry out many concatenation LED lamp pearl cluster numbers and maintain luminous lumen value thereby improve light efficiency and restrain the light decay, the LED lamps and lanterns of the different power of above-mentioned drive circuit adaptation moreover.

The utility model has the advantages that:

The above description is intended to be illustrative of the present invention and is not intended to be limiting, and all such modifications, equivalents and improvements as fall within the spirit and scope of the invention are intended to be included therein.

Claims

1. An LED linear constant current driving circuit for inhibiting light decay is characterized by comprising an alternating current input end, a first protection module, a rectification module, an LED lamp group, a driving module and a second protection module; the alternating current input end is connected with the first protection module, alternating current is accessed through the alternating current input end and enters the first protection module, the first protection module is connected with the rectification module, and the first protection module transmits stable alternating current to the rectification module; the rectification module is connected with the LED lamp group and converts alternating current into direct current to be transmitted to the input end of the LED lamp group; the output end of the LED lamp group is connected with a driving module through a second protection module, and the driving module is used for controlling the LED lamp group to emit light; the LED lamp bank is more than 2 groups, LED lamp beads which are more than 2 connected in series are included in each LED lamp bank, and each group of LED lamp beads are connected in parallel.

2. The LED linear constant-current driving circuit for suppressing the light attenuation according to claim 1, wherein the alternating-current input end comprises a zero line end and a live line end, the first protection module comprises a fuse and a piezoresistor, the zero line end is connected with one end of the fuse, the other end of the fuse is connected with one end of the piezoresistor, and the other end of the piezoresistor is connected with the live line end.

3. The LED linear constant current driving circuit for suppressing light attenuation according to claim 2, wherein the rectifying module comprises a rectifying IC and a filter circuit, the filter circuit comprises a first filter capacitor, a second filter capacitor, a first pull-down resistor, a first divider resistor and a second divider resistor, the rectifying IC comprises 4 pins, pin 1 and pin 2 of the rectifying IC are respectively connected with two ends of a voltage dependent resistor, pin 3 and pin 4 of the rectifying IC are respectively connected with two ends of the first filter capacitor, the second filter capacitor is connected with the first filter capacitor in parallel, two ends of the second filter capacitor are respectively connected with pin 3 and pin 4 of the rectifying IC, one end of the first pull-down resistor is connected with pin 4 of the rectifying IC and is connected between the first filter capacitor and the second filter capacitor in series, the other end of the first pull-down resistor is grounded, one end of the first voltage divider resistor is connected with pin 3 of the rectifying IC, the other end of the first voltage-dividing resistor is connected with one end of the second voltage-dividing resistor, and the other end of the second voltage-dividing resistor is connected with the driving module.

4. The LED linear constant current drive circuit for suppressing light decay as claimed in claim 3, wherein the specific model of the rectification IC is GBU 410.

5. The LED linear constant-current driving circuit for suppressing the light attenuation according to claim 1, wherein the driving module comprises a driving chip and an adjusting circuit, the driving chip comprises 16 pins which are respectively a VS end, a CP end, a BRO end, a VCC end, a COM end, a DIM end, a GND end, a CS end, a GD1 end, a GD2 end, a GD3 end, a GD4 end, a GD5 end, an ST end and 2 NC ends, the adjusting circuit comprises a brightness control port, a third filter capacitor, a fourth filter capacitor, a fifth filter capacitor, a denoising capacitor, a loop compensation capacitor, a first current limiting resistor, a second current limiting resistor, a third current limiting resistor, a clamping resistor and a second pull-down resistor, and the brightness control port comprises a port 1 and a port 2;

6. The LED linear constant current driving circuit for suppressing light decay as claimed in claim 5, wherein the specific model of the driving chip is L1050.

7. The LED linear constant current driving circuit for suppressing light attenuation according to claim 5, wherein the second protection module comprises a sixth filter capacitor, a seventh filter capacitor, an eighth filter capacitor, a ninth filter capacitor, a tenth filter capacitor, an eleventh filter capacitor, a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a fifth MOS transistor, a sixth MOS transistor, a seventh MOS transistor, an eighth MOS transistor, a ninth MOS transistor, a fourth current limiting resistor, a fifth current limiting resistor, a sixth current limiting resistor, a seventh current limiting resistor, an eighth current limiting resistor, a ninth current limiting resistor, a tenth current limiting resistor, an eleventh current limiting resistor, and a twelfth current limiting resistor;

one end of the sixth filter capacitor is connected with the ST end, the other end of the sixth filter capacitor is grounded, one end of the fourth current-limiting resistor is connected with the sixth filter capacitor, and the other end of the fourth current-limiting resistor is connected with the input end of the LED lamp bank; one end of the seventh filter capacitor is connected with the drain electrode of the first MOS tube, the other end of the seventh filter capacitor is grounded, the grid electrode of the first MOS tube is connected with the GD1 end, the source electrode of the first MOS tube is connected with one end of the fifth current-limiting resistor, and the other end of the fifth current-limiting resistor is connected with the CS end; one end of the eighth filter capacitor is connected with the drain electrode of the second MOS tube, the other end of the eighth filter capacitor is grounded, the grid electrode of the second MOS tube is connected with the GD2 end, the source electrode of the second MOS tube is connected with one end of the sixth current-limiting resistor, and the other end of the sixth current-limiting resistor is connected with the CS end; one end of the ninth filter capacitor is connected with the drain electrode of the third MOS tube, the other end of the ninth filter capacitor is grounded, the grid electrode of the third MOS tube is connected with the GD3 end, and the source electrode of the third MOS tube is connected with the CS end; the drain electrodes of the fourth MOS tube and the fifth MOS tube are both connected with one end of a tenth filter capacitor, the other end of the tenth filter capacitor is grounded, the grid electrodes of the fourth MOS tube and the fifth MOS tube are both connected with the GD4 end, the source electrode of the fourth MOS tube is connected with one end of a seventh current-limiting resistor, the other end of the seventh current-limiting resistor is connected with the CS end, the source electrode of the fifth MOS tube is connected with an eighth current-limiting resistor, and the other end of the eighth current-limiting resistor is connected with the CS end; the drain electrodes of the sixth MOS tube, the seventh MOS tube, the eighth MOS tube and the ninth MOS tube are all connected with one end of an eleventh filter capacitor, the other end of the eleventh filter capacitor is grounded, the grids of the sixth MOS tube, the seventh MOS tube, the eighth MOS tube and the ninth MOS tube are all connected with the GD5 end, the source electrode of the sixth MOS tube is connected with a ninth current-limiting resistor, the other end of the ninth current-limiting resistor is connected with the CS end, the source electrode of the seventh MOS tube is connected with a tenth current-limiting resistor, the other end of the tenth current-limiting resistor is connected with the CS end, the source electrode of the eighth MOS tube is connected with an eleventh current-limiting resistor, the other end of the eleventh current-limiting resistor is connected with the CS end, the source electrode of the ninth MOS tube is connected with a twelfth current-limiting resistor, and the other end of the twelfth current-limiting resistor is connected with the CS end.

8. The LED linear constant current driving circuit for suppressing light decay according to claim 7, wherein the second protection module further comprises a third pull-down resistor and a fourth pull-down resistor, one end of the third pull-down resistor is connected to a sixth current-limiting resistor and is located between the sixth current-limiting resistor and the CS terminal, and the other end of the third pull-down resistor is grounded; one end of a fourth pull-down resistor is connected with the source electrode of the third MOS tube and is positioned between the source electrode of the third MOS tube and the CS end, and the other end of the fourth pull-down resistor is grounded.

9. The LED linear constant current driving circuit for suppressing light decay according to claim 7, wherein the LED lamp set comprises a first circuit, a second circuit, a third circuit, a fourth circuit and a fifth circuit, the first circuit, the second circuit, the third circuit, the fourth circuit and the fifth circuit respectively comprise more than 2 LED lamp bead strings, each LED lamp bead string comprises more than 2 LED lamp beads connected in series, each LED lamp bead string is connected in parallel, the number of the lamp beads in each LED lamp bead string is equal, the input ends of the first circuit, the second circuit, the third circuit, the fourth circuit and the fifth circuit are respectively connected with the rectifying module, the output end of the first circuit is connected with the drain electrode of the first MOS tube, the output end of the second circuit is connected with the drain electrode of the second MOS tube, the output end of the third circuit is connected with the drain electrode of the third MOS tube, the output end of the fourth section of circuit is connected with the drain electrodes of the fourth MOS tube and the fifth MOS tube, and the output end of the fifth section of circuit is connected with the drain electrodes of the sixth MOS tube, the seventh MOS tube and the eighth MOS tube.