CN107567133B - Work in the LED constant current control device under a variety of line voltages - Google Patents
Work in the LED constant current control device under a variety of line voltages Download PDFInfo
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- CN107567133B CN107567133B CN201710764924.2A CN201710764924A CN107567133B CN 107567133 B CN107567133 B CN 107567133B CN 201710764924 A CN201710764924 A CN 201710764924A CN 107567133 B CN107567133 B CN 107567133B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The present invention provides a kind of LED constant current control device worked under a variety of line voltages, it is connect with LED illumination mould group, LED illumination mould group should can be divided into N sections according to its forward voltage, LED constant current control device includes: rectification filtering module, for being rectified and being filtered alternating current, to be for conversion into direct current；Control module, for exporting first control signal, entering series connection to control N sections of LED illumination mould groups when the voltage value for detecting direct current is more than a voltage preset value；When detecting the voltage value of direct current lower than the voltage preset value, export second control signal, to be two strings by N sections of LED illumination mould splits, N sections of LED illumination mould groups of control are in different working condition, and LED illumination mould group of the work under identical working condition is made to enter parallel connection.The high power factor under various input voltage, invariable power, piecewise linearity constant current may be implemented in the present invention, and circuit has wide range of applications.
Description
Technical field
The invention belongs to the driving circuit technical fields of LED, are related to a kind of control device, work in more particularly to one kind
LED constant current control device under a variety of line voltages.
Background technique
There are two developing direction for LED constant current driving, first is that Switching Power Supply constant-current source, another direction is linear constant current.It opens
It closes power supply constant current source to be mainly made of switching tube and magnetic prototype part, control chip and capacitance resistance ware, is easy to produce EMI and asks
Topic, volume is also bigger, and realization is fully integrated, and Surface Mounting Technology is relatively difficult.Linear constant current can be but also active to overcome the above shortcomings
Rate factor is low, the narrow feature of the input voltage range of work.The main technical schemes of existing related invention are as follows: low input
When, two-way circuit works independently；When input voltage is high, two-way circuit tandem working, so finding out the prior art, there are circuits
The defects of complexity, application range is narrow, cannot achieve the linear constant current under various input voltage.
Therefore, a kind of LED constant current control device worked under a variety of line voltages how is provided, to solve the prior art
The defects of there are circuit complexity, and application range is narrow, cannot achieve the linear constant current under various input voltage, has become ability in fact
Field technique personnel technical problem urgently to be resolved.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide one kind to work in a variety of line voltages
Under LED constant current control device, for solve the prior art there are circuit complexity, application range is narrow, cannot achieve a variety of defeated
The problem of entering the linear constant current under voltage.
In order to achieve the above objects and other related objects, the present invention provides a kind of LED worked under a variety of line voltages
Constant-current control device, the LED constant current control device are connect with LED illumination mould group, and LED illumination mould group should can according to its forward voltage
It is divided into N sections, wherein N is the even number more than or equal to 6；The LED constant current control device includes: rectification filtering module, for that will hand over
Galvanic electricity is rectified and is filtered, to be for conversion into direct current；Control module, for surpassing when the voltage value for detecting the direct current
When crossing a voltage preset value, first control signal is exported, enters series connection to control the N sections of LED illumination mould group；Work as detection
To the direct current voltage value be lower than the voltage preset value when, export second control signal, by the N section LED illumination mould
Group is divided into two strings, and N sections of LED illumination mould groups of control are in different working condition, and shine LED of the work under identical working condition
Bright mould group enters parallel connection.
In one embodiment of the invention, the forward voltage of first segment LED illumination mould group in the N sections of LED illumination mould groups
Equal to the forward voltage of (N/2+1) section LED illumination mould group, the forward voltage of second segment LED illumination mould group is equal to (N/2+2)
The forward voltage of section LED illumination mould group, until the forward voltage of N/2 sections of LED illumination mould groups is equal to N sections of LED illumination mould groups
Forward voltage.
In one embodiment of the invention, the rectification filtering module includes the rectifier bridge connecting with mains supply, and with
The filter unit of the rectifier bridge connection.
In one embodiment of the invention, the filter unit is a filter capacitor；One end of the filter capacitor and institute
Rectifier bridge connection is stated, the other end of the filter capacitor and the input terminal of control module connect.
In one embodiment of the invention, the control module includes: that detection unit and the detection unit are electrically connected
Control signal output unit, with it is described control signal output unit be electrically connected reversing unit, with the reversing unit and
The convertor unit and the multi-stage constant current control unit being electrically connected with the convertor unit that the LED illumination module is electrically connected；
Wherein, the detection unit is used to detect the voltage value of the direct current；The control signal output unit is single in the detection
When member detects that the voltage value of the direct current is more than a voltage preset value, the first control signal is exported, to change described in order
It is closed to unit；When the detection unit detects the voltage value of the direct current lower than the voltage preset value, described in output
Second control signal, to enable the reversing unit open；When the reversing unit senses the first control signal, disconnect certainly
Access between body and the LED illumination mould group；Or when sensing the second control signal, opens itself and the LED shines
Access between bright mould group；The convertor unit detects that the voltage value of the direct current is more than a voltage in the detection unit
Preset value, when the reversing unit disconnects the access between the LED illumination mould group, working condition is set as reverse-biased；
Or detect the voltage value of the direct current lower than the voltage preset value, the reversing unit opening and institute in the detection unit
When stating the access between LED illumination mould group, working condition is set as on state；The multi-stage constant current control unit is according to
The on state of convertor unit, N sections of LED illumination mould groups of Discrete control make LED illumination mould group of the work under identical working condition
Into parallel connection.
In one embodiment of the invention, the detection unit includes first resistor, second resistance and first capacitor；Its
In, one end of first resistor and the other end of filter capacitor connect, and the other end of first resistor and one end of second resistance connect,
The other end of second resistance and one end of first capacitor connect, first capacitor other end ground connection.
In one embodiment of the invention, the control signal output unit includes the first triode, the second triode, the
Three resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and the first field-effect tube；Wherein, first triode
Emitter and one end of 3rd resistor connect, the other end of the base stage of the first triode and 3rd resistor connects, the 4th resistance
One end and the other end of 3rd resistor connect, the other end of the 4th resistance connect with the collector of the second triode, the two or three
The base stage of pole pipe is connect with one end of the 5th resistance, and the other end of the 5th resistance is connect with one end of the 6th resistance, the 6th resistance
The other end connect with one end of the 7th resistance, the other end of the 7th resistance is connect with the collector of the second triode, first
The grid of effect pipe is connect with the collector of the first triode, and the drain electrode of the first field-effect tube is connect with one end of the 7th resistance,
The source electrode of first field-effect tube is connect with the reversing unit.
In one embodiment of the invention, the reversing unit includes the second field-effect tube；Second field-effect tube
Grid is connect with the source electrode of the first field-effect tube, and the drain electrode of second field-effect tube connects with the other end of the filter capacitor
It connects, the source electrode of second field-effect tube is connect with the input terminal of the convertor unit.
In one embodiment of the invention, the convertor unit includes several diodes；Wherein, the anode of a diode
It is connect with the source electrode of second field-effect tube, cathode is connect with the anode of first LED illumination mould group；Another diode is set
It is placed between the LED illumination mould group of preceding N/2 and the LED illumination mould group of rear N/2；Each section of LED in the LED illumination mould group of N/2 afterwards
Another diode is all connected between illumination module and multi-stage constant current control unit.
In one embodiment of the invention, the multi-stage constant current control unit includes the multi-stage constant current control of several control pins
Device processed and several field-effect tube for connecting with the cathode of each section of LED illumination mould group, and being connected from different control pins.
As described above, the LED constant current control device worked under a variety of line voltages of the invention, has below beneficial to effect
Fruit:
The LED constant current control device of the present invention worked under a variety of line voltages may be implemented in a variety of input electricity
The high power factor of pressure, invariable power, piecewise linearity constant current, and circuit has wide range of applications.
Detailed description of the invention
Fig. 1 is shown as the of the invention LED constant current control device worked under a variety of line voltages in an embodiment
Theory structure schematic diagram.
Fig. 2 is shown as a kind of implementing circuit for working in the LED constant current control device under a variety of line voltages of the invention
Schematic diagram.
Fig. 3 A is shown as LED constant current control device of the invention and controls 6 sections of LED illumination mould group work in the original of series connection
Manage circuit diagram.
Fig. 3 B is shown as the basic circuit diagram of LED constant current control device Discrete control LED illumination mould group of the invention.
Component label instructions
1 works in the LED constant current control device under a variety of line voltages
11 rectification filtering modules
12 control modules
121 detection units
122 control signal output units
123 reversing units
124 convertor units
125 multi-stage constant current control units
2 LED illumination mould groups
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
It should be noted that illustrating the basic structure that only the invention is illustrated in a schematic way provided in following embodiment
Think, only shown in schema then with related component in the present invention rather than component count, shape and size when according to actual implementation
Draw, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout kenel
It is likely more complexity.
Embodiment
The present embodiment provides a kind of LED constant current control device worked under a variety of line voltages, LED constant current control dresses
It sets and is connect with LED illumination mould group, LED illumination mould group should can be divided into N sections according to its forward voltage, wherein N is more than or equal to 6
Even number；The LED constant current control device includes:
Rectification filtering module, for being rectified and being filtered alternating current, to be for conversion into direct current；
Control module, for when the voltage value for detecting the direct current is more than a voltage preset value, output first to be controlled
Signal processed enters series connection to control the N sections of LED illumination mould group；It is somebody's turn to do when the voltage value for detecting the direct current is lower than
When voltage preset value, second control signal is exported, is two strings by the N sections of LED illumination mould splits, controls N sections of LED illumination moulds
Group is in different working condition, and LED illumination mould group of the work under identical working condition is made to enter parallel connection.
Below with reference to diagram to the LED constant current control device worked in provided by the present embodiment under a variety of line voltages
It is described in detail.Fig. 1 and 2 is please referred to, the LED constant current control device for being respectively indicated as working under a variety of line voltages is in one
Theory structure schematic diagram in embodiment and a kind of reality for being shown as the LED constant current control device worked under a variety of line voltages
Apply circuit diagram.As shown in Figure 1, the LED constant current control device 1 is connect at least N sections of LED illumination mould group 2, wherein N is
Even number more than or equal to 6.The forward voltage of first segment LED illumination mould group is equal to (N/2+1) in the N sections of LED illumination mould groups
The forward voltage of the forward voltage of section LED illumination mould group, second segment LED illumination mould group is equal to (N/2+2) section LED illumination mould
The forward voltage of group, until the forward voltage of N/2 sections of LED illumination mould groups is equal to the forward voltage of N sections of LED illumination mould groups.
(in this present embodiment, N takes 6, LED1 and LED4, LED2 and LED5, LED3 phase equal or basic with the forward voltage of LED6
Deng).The LED constant current control device 1 worked under a variety of line voltages includes rectification filtering module 11 and control module 12.
Wherein, the control module 12 includes detection unit 121, control signal output unit 122, reversing unit 123, convertor unit
124 and multi-stage constant current control unit 125.
Wherein, the rectification filtering module 11 is for being rectified and being filtered alternating current, to be for conversion into direct current.?
In the present embodiment, sinusoidal ac rectifying and wave-filtering is pulsed sinusoidal direct current by the rectification filtering module 11, is subsequent LED
Illumination module provides electric energy and potential circuit signal.As shown in Fig. 2, the rectification filtering module 11 includes connecting with mains supply
Rectifier bridge DB1, and the filter unit being connect with the rectifier bridge.The filter unit is a filter capacitor C.The filtering is single
Member is a filter capacitor C；One end of the filter capacitor C is connect with the rectifier bridge, the other end of the filter capacitor C and control
The input terminal of molding block 12 connects.
It is used for the control module 12 that the rectification module 11 is electrically connected when the voltage value for detecting the direct current is super
When crossing a voltage preset value, first control signal is exported, enters series connection to control the N sections of LED illumination mould group；Work as detection
To the direct current voltage value be lower than the voltage preset value when, export second control signal, by the N sections of LED illumination mould
Group is divided into two strings, and N sections of LED illumination mould groups of control are in different working condition, and make LED of the work under identical working condition
Illumination module enters parallel connection.
With continued reference to Fig. 1 and Fig. 2, the detection unit 121 is used to detect the voltage value of the direct current.In the present embodiment
In, the detection unit 121 includes first resistor R1, second resistance R2 and first capacitor C1 electronic component；Wherein, the first electricity
One end of resistance R1 is connect with the other end of filter capacitor C, and the other end of first resistor R1 is connect with one end of second resistance R2, the
The other end of two resistance R2 is connect with one end of first capacitor C1, first capacitor C1 other end ground connection.
The control signal output unit 122 detects that the voltage value of the direct current is more than an electricity in the detection unit
When pressing preset value, the first control signal is exported, to enable the reversing unit close；It is detected in the detection unit described
When the voltage value of direct current is lower than the voltage preset value, the second control signal is exported；To enable the reversing unit open.?
In embodiment, the control signal output unit includes the first triode T1, the second triode T2,3rd resistor R3, the 4th electricity
Hinder the electronic components such as R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the first field-effect tube Q1；Wherein, described
The emitter E of one triode T1 is connect with one end of 3rd resistor R3, the base stage B's and 3rd resistor R1 of the first triode T1
Other end connection, one end of the 4th resistance R4 are connect with the other end of 3rd resistor R3, the other end and second of the 4th resistance R4
The collector C connection of triode T2, the base stage B of the second triode T2 are connect with one end of the 5th resistance R5, the 5th resistance R5's
The other end is connect with one end of the 6th resistance R6, and the other end of the 6th resistance R6 is connect with one end of the 7th resistance R7, the 7th electricity
The other end of resistance R7 is connect with the collector C of the second triode T2, the grid G of the first field-effect tube Q1 and the first triode T1
Collector C connection, the drain D of the first field-effect tube Q1 connect with one end of the 7th resistance R7, the source of the first field-effect tube Q1
Pole S is connect with the reversing unit 123.
When the reversing unit 123 senses the first control signal, disconnect itself and the LED illumination mould group 2 it
Between access；Or when sensing the second control signal, itself access between the LED illumination mould group 2 is opened.At this
In embodiment, the reversing unit 123 includes the second field-effect tube Q2, the electronics member such as eleventh resistor R11 and the second capacitor C2
Device.The grid G of the second field-effect tube Q2 is connect with the source S of the first field-effect tube Q1, the second field-effect tube Q2
Drain D connect with the other end of the filter capacitor C, the source S of the second field-effect tube Q2 and the convertor unit 124
Input terminal connection.
The convertor unit 124 detects that the peak value of the direct current and peak value are above one in the detection unit 121
Voltage preset value, when the reversing unit 123 disconnects the access between the LED illumination mould group 2, working condition is set as anti-
Inclined state；Or detect the voltage value of the direct current lower than the voltage preset value, the commutation list in the detection unit 124
When member opens the access between the LED illumination mould group, working condition is set as on state.In the present embodiment, described
Convertor unit includes several diode electronic components (i.e. D1, D3, D4, D5, D6)；Wherein, diode D1 anode with it is described
The source S of second field-effect tube Q2 connects, and diode D1 cathode is connect with the anode of first LED illumination mould group (LED1).Separately
One diode D3 is set to first 3 sections of LED illumination mould group, and ((LED4 is extremely for LED1 to LED3) and rear 3 sections of LED illumination module
LED6 between), i.e. the anode of diode D3 is connect with the cathode of LED3, and the cathode of diode D3 and the anode of LED4 connect.
Another two are all connected between each section of LED illumination mould group and multi-stage constant current control unit in 3 sections of LED illumination mould groups afterwards
Pole pipe (D4, D5, D6).
On state of the multi-stage constant current control unit 125 according to the convertor unit, N sections of LED illuminations of Discrete control
Mould group makes LED illumination mould group of the work under identical working condition enter parallel connection, to realize high power factor, invariable power.
The multi-stage constant current control unit 125 include it is several control pins multi-stage constant current controller U1 and with each section of LED illumination mould
The cathode connection of group, and from the electronic components such as several field-effect tube (Q4, Q5, Q6, Q7, Q8) of different control pins connections.
In the present embodiment, the multi-stage constant current controller includes 16 pins, and the first pin is connected to one end of the 8th resistance, and the 8th
The other end of resistance is connected to the drain D connection of third field-effect tube T3, and the grid G of third field-effect tube T3 is connected to the 9th
One end of resistance R9, the other end ground connection of the 9th resistance R9, the source S ground connection of third field-effect tube T3.Second, third, the 4th
Pin is connected to one end of the 5th capacitor C5, the other end ground connection of the 5th capacitor C5, and the 5th pin is connected to the 6th capacitor C6's
One end, the other end ground connection of the 6th capacitor C6.6th pin is connected to one end of the 7th capacitor C7, the other end of the 7th capacitor C7
Ground connection, the 8th pin are directly grounded.16th pin is connected to the anode of first segment LED illumination mould group (LED1).15th draws
Foot ground connection.14th pin is connect with the grid G of the 4th field-effect tube Q4, and the source S of the 4th field-effect tube Q4 passes through the 19th
Resistance R19 is connected to the 9th pin, and the drain D of the 4th field-effect tube Q4 is connected to the negative of first segment LED illumination mould group (LED1)
Pole.13rd pin is connect with the grid G of the 5th field-effect tube Q5, and the drain D of the 5th field-effect tube Q5 is connected to second segment LED
The cathode of illumination module (LED2), the source electrode of the 5th field-effect tube Q5 are connect with the source S of the 4th field-effect tube Q4.12nd
Pin is connect with the grid G of the 6th field-effect tube Q6, and the drain D of the 6th field-effect tube Q6 is connected to third section LED illumination mould group
(LED3) source electrode of cathode, the 6th field-effect tube Q6 is connect with the source S of the 4th field-effect tube Q4.11st pin and
The grid G of seven field-effect tube Q7 connects, and the drain D of the 7th field-effect tube Q7 is connected to the 5th section of LED illumination mould group (LED5)
The source electrode of cathode, the 7th field-effect tube Q7 is connect with the source S of the 4th field-effect tube Q4.Tenth pin and the 8th field-effect tube
The grid G of Q8 connects, and the drain D of the 8th field-effect tube Q8 is connected to the cathode of the 6th section of LED illumination mould group (LED6), and the 8th
The source electrode of effect pipe Q8 is connect with the source S of the 4th field-effect tube Q4.
In the present embodiment, when the control module 12 detects that the peak value of the direct current and peak value are above a voltage
When preset value, the work of 6 sections of LED illumination moulds group 2 is controlled in series connection.For example, the LED constant current control device 1 exists
The lower work of 160~277V high voltage.Specifically, Fig. 3 A is please referred to, LED constant current control device is shown as and controls 6 sections of LED photographs
Basic circuit diagram of the bright mould group work in series connection.As shown in Figure 3A, when resistance R1, the detection unit 121 of the compositions such as R2, C1
When detecting that the voltage value of the direct current is more than a voltage preset value, first diode T1, the second diode T2, first is imitated
Should the control signal output units 122 of the compositions such as pipe Q1 export the first control signal, reversing unit Q2 is closed, by D1, D3,
The convertor unit 124 of the compositions such as D4, D5, D6 is with the help of reversing unit 123, since (LED1 is extremely for 6 sections of LED illumination modules
LED6) the presence of each point potential difference, i.e. V1 > V2 > V3 > V4 > V5 > V6 > V7 > V8, so that the D4 in convertor unit 124, D5, D6 are in
Reverse-biased, 6 sections of LED illumination mould groups enter tandem working state.
When the control module 12 detects the voltage value of the direct current lower than the voltage preset value, control described 6
Section LED illumination module 2 is first divided into two strings, works in 3 sections of working conditions, wherein the LED illumination mould group in each section of working condition
Work is in parallel connection.For example, the LED constant current control device 1 works under 100~160V low-voltage.Specifically, it please refers to
Fig. 3 B is shown as the basic circuit diagram of LED constant current control device Discrete control LED illumination mould group.As shown in Figure 3B, work as direct current
Voltage value be lower than the voltage preset value when, reversing unit Q2 open, when LED constant current control device enter half of power frequency period
When interior, when the voltage of direct current enters the first pressure section by sinusoidal raising by 0V, the 4th field-effect tube Q4 is opened, D4 conducting, due to
V1 ≈ V5, V2 ≈ V6 is worked at the same time so that LED1 and LED4 is in parallel.The voltage of direct current, which further increases, enters the second pressure section,
When V1 ≈ V5, V3 ≈ V7, the 5th field-effect tube Q5 is opened, and the 4th field-effect tube Q4 is closed, and LED1 and LED2 first connect, LED4
It also connects with LED5, D5 conducting, concatenated LED1 and LED2 and concatenated LED4 and LED5 passes through D5 again and enters work in parallel later
Make state；When the voltage of direct current continues to ascend into third pressure section, when V1 ≈ V5, V4 ≈ V8, the 6th field-effect tube is opened,
5th and the 4th field-effect tube Q5 and Q4 is closed, LED1-LED3 series connection, LED4-LED6 series connection, then the D6 by being connected makes two
The concatenated LED illumination mould group of group enters parallel connection.
In conclusion the LED constant current control device of the present invention worked under a variety of line voltages may be implemented
High power factor under various input voltage, invariable power, piecewise linearity constant current, and circuit has wide range of applications.So the present invention
It effectively overcomes various shortcoming in the prior art and has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (9)
1. a kind of LED constant current control device worked under a variety of line voltages, which is characterized in that the LED constant current control device
It is connect with LED illumination mould group, LED illumination mould group should can be divided into N sections according to its forward voltage, wherein N is the idol more than or equal to 6
Number；The LED constant current control device includes:
Rectification filtering module, for being rectified and being filtered alternating current, to be for conversion into direct current；
Control module, for when the voltage value for detecting the direct current is more than a voltage preset value, the first control of output to be believed
Number, enter series connection to control the N sections of LED illumination mould group；When the voltage value for detecting the direct current is lower than the voltage
When preset value, second control signal is exported, is two strings by the N sections of LED illumination mould splits, controls at N sections of LED illumination mould groups
In different working condition, and LED illumination mould group of the work under identical working condition is made to enter parallel connection；
Wherein, the control module include: detection unit, with the detection unit be electrically connected control signal output unit,
The reversing unit and the reversing unit that are electrically connected with the control signal output unit and the LED illumination mould group are electrical
The convertor unit of connection and the multi-stage constant current control unit being electrically connected with the convertor unit；
The detection unit is used to detect the voltage value of the direct current；
The control signal output unit detects that the voltage value of the direct current is more than that a voltage is default in the detection unit
When value, the first control signal is exported, to enable the reversing unit close；The direct current is detected in the detection unit
Voltage value when being lower than the voltage preset value, the second control signal is exported, to enable the reversing unit open；
When the reversing unit senses the first control signal, itself access between the LED illumination mould group is disconnected；
Or when sensing the second control signal, itself access between the LED illumination mould group is opened；
The convertor unit detects that the voltage value of the direct current is more than a voltage preset value in the detection unit, described to change
When disconnecting the access between the LED illumination mould group to unit, working condition is set as reverse-biased；Or it is single in the detection
Member detects the voltage value of the direct current lower than the voltage preset value, and the reversing unit is opened and the LED illumination mould group
Between access when, working condition is set as on state；
The multi-stage constant current control unit makes according to the on state of the convertor unit, N sections of LED illumination mould groups of Discrete control
The LED illumination mould group to work under identical working condition enters parallel connection.
2. the LED constant current control device according to claim 1 worked under a variety of line voltages, which is characterized in that N sections
The forward voltage of first segment LED illumination mould group is equal to the forward direction of (N/2+1) section LED illumination mould group in the LED illumination mould group
Voltage, the forward voltage of second segment LED illumination mould group is equal to the forward voltage of (N/2+2) section LED illumination mould group, until N/
The forward voltage of 2 sections of LED illumination mould groups is equal to the forward voltage of N sections of LED illumination mould groups.
3. the LED constant current control device according to claim 1 worked under a variety of line voltages, which is characterized in that institute
Stating rectification filtering module includes the rectifier bridge connecting with mains supply, and the filter unit connecting with the rectifier bridge.
4. the LED constant current control device according to claim 3 worked under a variety of line voltages, which is characterized in that institute
Stating filter unit is a filter capacitor；One end of the filter capacitor is connect with the rectifier bridge, the filter capacitor it is another
End is connect with the input terminal of control module.
5. the LED constant current control device according to claim 1 worked under a variety of line voltages, which is characterized in that
The detection unit includes first resistor, second resistance and first capacitor；Wherein, one end of first resistor and filter capacitor
Other end connection, one end of the other end of first resistor and second resistance connects, the other end and first capacitor of second resistance
One end connection, the first capacitor other end ground connection.
6. the LED constant current control device according to claim 5 worked under a variety of line voltages, which is characterized in that
The control signal output unit include the first triode, the second triode, 3rd resistor, the 4th resistance, the 5th resistance,
6th resistance, the 7th resistance and the first field-effect tube；Wherein, one end of the emitter of first triode and 3rd resistor connects
It connects, the base stage of the first triode and the other end of 3rd resistor connect, and one end of the 4th resistance and the other end of 3rd resistor connect
It connects, the other end of the 4th resistance is connect with the collector of the second triode, one end of the base stage of the second triode and the 5th resistance
Connection, the other end of the 5th resistance are connect with one end of the 6th resistance, and the other end of the 6th resistance and one end of the 7th resistance connect
It connects, the other end of the 7th resistance is connect with the collector of the second triode, the grid of the first field-effect tube and the first triode
Collector connection, the drain electrode of the first field-effect tube are connect with one end of the 7th resistance, and the source electrode of the first field-effect tube is changed with described
It is connected to unit.
7. the LED constant current control device according to claim 6 worked under a variety of line voltages, which is characterized in that
The reversing unit includes the second field-effect tube；The grid of second field-effect tube and the source electrode of the first field-effect tube connect
Connect, the drain electrode of second field-effect tube is connect with the other end of the filter capacitor, the source electrode of second field-effect tube with
The input terminal of the convertor unit connects.
8. the LED constant current control device according to claim 7 worked under a variety of line voltages, which is characterized in that
The convertor unit includes several diodes；Wherein, the anode and the source electrode of second field-effect tube of a diode
Connection, cathode are connect with the anode of first LED illumination mould group；
Another diode is set between the LED illumination mould group of preceding N/2 and the LED illumination mould group of rear N/2；
Another two pole is all connected between each section of LED illumination mould group and multi-stage constant current control unit in the LED illumination mould group of N/2 afterwards
Pipe.
9. the LED constant current control device according to claim 7 worked under a variety of line voltages, which is characterized in that
The multi-stage constant current control unit include it is several control pins multi-stage constant current controllers and with each section of LED illumination mould
The cathode connection of group, and several field-effect tube connected from different control pins.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710764924.2A CN107567133B (en) | 2017-08-30 | 2017-08-30 | Work in the LED constant current control device under a variety of line voltages |
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| CN201710764924.2A CN107567133B (en) | 2017-08-30 | 2017-08-30 | Work in the LED constant current control device under a variety of line voltages |
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| CN107567133B true CN107567133B (en) | 2019-06-04 |
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| US8947014B2 (en) * | 2010-08-12 | 2015-02-03 | Huizhou Light Engine Ltd. | LED switch circuitry for varying input voltage source |
| CN102065610B (en) * | 2010-11-11 | 2013-08-21 | 广州奥迪通用照明有限公司 | LED (Light Emitting Diode) lamp control circuit |
| CN103167701B (en) * | 2013-04-01 | 2015-09-16 | 黄世蔚 | LED drive device and the method for work of series parallel structure is changed with input voltage |
| CN104780646B (en) * | 2014-01-15 | 2018-06-05 | 四川新力光源股份有限公司 | A kind of LED drive circuit for supporting controllable silicon light modulation |
| CN103889111B (en) * | 2014-02-28 | 2016-07-27 | 上海路千电子科技有限公司 | The linear constant current drive circuit of a kind of twin voltage operation and driving method thereof |
| CN106332363B (en) * | 2016-09-28 | 2018-06-15 | 矽力杰半导体技术(杭州)有限公司 | Led drive circuit |
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