CN207321594U - A kind of more pixel drive systems of LED - Google Patents
A kind of more pixel drive systems of LED Download PDFInfo
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- CN207321594U CN207321594U CN201721219624.8U CN201721219624U CN207321594U CN 207321594 U CN207321594 U CN 207321594U CN 201721219624 U CN201721219624 U CN 201721219624U CN 207321594 U CN207321594 U CN 207321594U
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Abstract
A kind of more pixel driver systems of LED, belong to technical field of LED illumination.Tthe utility model system includes power supply, constant-current drive circuit, pixel dot circuit, on-off circuit, drive control circuit；The pixel dot circuit is made of the LED light of multiple series connection；The on-off circuit has one or more LED light both ends multiple and be each parallel in the pixel dot circuit, and each on-off circuit is also respectively connected with the drive control circuit；The power supply is sequentially connected the constant-current drive circuit, the pixel dot circuit；Wherein, the on-off circuit includes switch metal-oxide-semiconductor or switching transistor or equal functional switch device, and the drive control circuit is the circuit for the open collector or switch metal-oxide-semiconductor open-drain output for making the switching transistor.The utility model is simple in structure, has simplified the more pixel driver system scales of LED significantly, and reduce production cost.
Description
Technical field
It the utility model is related to technical field of LED illumination, more particularly to a kind of more pixel drive systems of LED.
Background technology
Increasingly increase now with the requirement for nightscape lighting, the expressive force requirement for illuminating effect also increasingly increases
Add, one pixel of LED lamp can individually show it is a kind of it is full-color in random color, pixel is more, the picture that can be showed
Face is finer and smoother, therefore, at present for the requirement that it is also proposed pixel of lamps and lanterns.
The existing more pixel control modes of LED use parallel way substantially, as shown in Figure 1, each pixel is each logical
Road is all the unit of an independent control, and LED is required for current constant mode to drive, and the existing more pixel schemes of LED use
Low-voltage constant voltage source is unified to power, and each passage of each pixel of custom circuit is opened using a constant-current circuit and one
Powered-down road.Switch off LED connected in series to extinguish, switch conduction LED connected in series is lighted, and corresponding drive circuit passes through
On and off of the PWM mode control per road constant-current circuit, realizes the effect individually adjusted per paths of LEDs.But there are following for this mode
Shortcoming：
1st, more pixel point mode LED serial numbers are seldom, and voltage is low, and constant voltage source needs to select low-voltage, high-current version (aobvious
Display screen generally selects 5V 40A), the problem of bringing is that high current transmission range is short.It is and big using low pressure for outdoor lamp
The problem of current and power supply can bring line loss pressure drop big, and band lamp number is few；
2nd, there must be a constant-current circuit on every paths of LEDs, for low current LED（Display applications）, single can be selected
Chip multipath exports version, but for great power LEDs such as wall lamps, it is necessary to which multiple high current constant-current circuits, circuit are very multiple
It is miscellaneous；
3rd, of high cost, each passage of each pixel is required for constant-current drive circuit independent all the way, substantial amounts of constant current
Circuit considerably increases the cost of lamps and lanterns；
4th, currently used constant-current circuit uses linear constant current circuit, when for dimmer switch, can produce very big device
Part is lost；
5th, the drive control circuit commonly used when LED is dimmed such as half-bridge driver is driven, in order to matching switch circuit
Required voltage is turned off, then the half-bridge driver needs to reconnect triode, or capacitance, diode to draw high voltage；At the same time
The attachable on-off circuit quantity of half-bridge driver is few, and the scale of LED lamp is still larger, and cost is higher.
Utility model content
The utility model is in view of the problems of the existing technology, it is proposed that one kind solution outdoor lamp line loss pressure drop is big, band
Lamp number is few, lamps and lanterns scale is big and the more pixel drive systems of the LED of problem of high cost.
The utility model technical scheme is that：
A kind of more pixel drive systems of LED, including power supply, constant-current drive circuit, pixel dot circuit, on-off circuit, drive
Dynamic control circuit；The pixel dot circuit is made of the LED light of multiple series connection；The on-off circuit has multiple and is each parallel to
A LED light or multiple LED light both ends, each on-off circuit in the pixel dot circuit are also respectively connected with the drive control
Circuit；The power supply is sequentially connected the constant-current drive circuit, the pixel dot circuit；Wherein, the on-off circuit includes opening
Metal-oxide-semiconductor or switching transistor are closed, the drive control circuit is to make the open collector or switch MOS of the switching transistor
The circuit of pipe open-drain output.
Preferably, the on-off circuit further includes the first divider resistance, the second divider resistance；The switch metal-oxide-semiconductor
Source electrode is connected to the cathode of the LED light, and the drain electrode of the switch metal-oxide-semiconductor is connected to the anode of the LED light, the switch
Be connected with the first divider resistance between the source electrode of the gate pole of metal-oxide-semiconductor and the switch metal-oxide-semiconductor, the gate pole of the switch metal-oxide-semiconductor with
The second divider resistance is connected between the drive control circuit.
Preferably, the constant-current drive circuit is DC-DC constant-current drive circuits.
Preferably, the constant-current drive circuit includes dc-dc, the tenth resistance, the 20th resistance, the one or two pole
Pipe, the first inductance；The tenth resistance and are parallel between the power voltage terminal and output current induction end of the dc-dc
20 resistance, the power voltage terminal of the dc-dc connect the cathode of first diode, first diode
Anode connects the output switching terminal of the dc-dc；Described tenth resistance one end connects the power supply, other end connection institute
State the cathode of pixel dot circuit；The output switching terminal of the dc-dc is through pixel electricity described in first inductance connection
The anode on road.
Preferably, the constant-current drive circuit further includes filter branch, the filter branch is arranged on the power supply and institute
State between the tenth resistance.
Preferably, the filter branch includes the first capacitance parallel with one another, the 3rd capacitance, and the first capacitance, the 3rd
Capacitance is all connected between the power supply and ground connection.
Preferably, the power supply is 24 volts of power supplys.
Preferably, the drive control circuit includes drive control chip and its peripheral circuit, the drive control core
The Constant current output end of piece connects the on-off circuit.
Preferably, the drive control circuit includes driving triode, driving resistance；The current collection of the driving triode
Gate pole of the pole through the driving resistance connection switch metal-oxide-semiconductor, the emitter ground connection of the driving triode, the driving three
The base stage of pole pipe connects second divider resistance.
Preferably, the switch metal-oxide-semiconductor uses PMOS tube, Vgs conducting voltages scope is -3V--20V.
Preferably, a constant-current drive circuit, an image element circuit, multiple switch circuit form one group of picture
Element driving path；The more pixel drive systems of LED include multigroup pixel driver path.
The utility model has the advantages that：
A kind of more pixel drive systems of LED of the utility model, simple in structure, scale is simplified, cost is greatly reduced, effectively
Solve the problems, such as that the pressure drop of outdoor lamp line loss is big, band lamp number is few.
Brief description of the drawings
Fig. 1 is the circuit diagram of the prior art；
Fig. 2 is a kind of functional block diagram of the more pixel drive systems of LED of the utility model；
Fig. 3 is the circuit diagram of constant-current drive circuit in a kind of more pixel drive systems of LED of the utility model；
Fig. 4 is the circuit diagram of pixel dot circuit and on-off circuit in a kind of more pixel drive systems of LED of the utility model；
Fig. 5 is the circuit of an embodiment drive control circuit in a kind of more pixel drive systems of LED of the utility model
Figure；
Fig. 6 is the electricity of another embodiment drive control circuit in a kind of more pixel drive systems of LED of the utility model
Lu Tu.
Embodiment
It is specific embodiment of the utility model and with reference to attached drawing below, the technical solution of the utility model is made further
Description, but the utility model is not limited to these embodiments.
Fig. 1 shows the more pixel control modes of existing LED, and existing drive system includes constant voltage source, multichannel pixel path
And drive circuit, and LED light, constant-current circuit and the on-off circuit for including being cascaded per road pixel path.When carrying out a little
, it is necessary to establish multichannel pixel path when matrix LED pixel controls, and multiple constant current circuit and on-off circuit are needed, so filled
Lamps and lanterns with the drive system need the big metering device of much room capacity, then lamps and lanterns scale is big, and production cost is also very high.
For this reason, the utility model proposes a kind of more pixel drive systems of LED.Such as Fig. 2, which includes power supply, constant current
Drive circuit, pixel dot circuit, on-off circuit, drive control circuit.The pixel dot circuit by multiple series connection LED light structure
Into wherein each LED light is a pixel.The on-off circuit has multiple and is each parallel in the pixel dot circuit
One LED light both ends, each on-off circuit are also respectively connected with the drive control circuit.The power supply is sequentially connected the constant current
Drive circuit, the pixel dot circuit.According to the more pixel demands of LED, each on-off circuit can also be parallel to multiple series connection
LED light both ends.
The on-off circuit includes switch metal-oxide-semiconductor, and the general metal-oxide-semiconductor that switchs needs fast driving, then often adopted in driving
Specific drive circuit, such as half-bridge driver, during meeting fast driving, while on-off circuit on, off can be provided again
Voltage.As soon as but a half-bridge driver can gate an on-off circuit, also say, one is controlled by a half-bridge driver
The turn-on and turn-off of LED light.In this way, still depositing needs substantial amounts of half-bridge driver to control multiple pixel on-off circuits
System, it is big that LED lamp still suffers from scale, the problem of not enough simplifying；Meanwhile half-bridge driver is reaching switch metal-oxide-semiconductor shut-off voltage
Need to realize by additional triode, or the mode such as diode and capacitance during value, the size of so whole LED lamp expands again
.For this reason, consider that Tthe utility model system is mainly used for light modulation field, the requirement that switch metal-oxide-semiconductor quickly starts be not it is very high,
As long as disclosure satisfy that switch metal-oxide-semiconductor effective on, off in normal range (NR), then the drive control circuit is arranged to make described
Switch the circuit of metal-oxide-semiconductor open-drain output.The switch metal-oxide-semiconductor also can be replaced switching transistor, then the drive control
Circuit is arranged to the circuit for exporting switching transistor open collector.Equally, other have with switch metal-oxide-semiconductor or switching transistor
The switching device of equal function also alternatively uses.
Specifically, Fig. 4 is shown includes switch metal-oxide-semiconductor as exemplary circuit diagram using on-off circuit.The on-off circuit is also
Including the first divider resistance, the second divider resistance.The source electrode of the switch metal-oxide-semiconductor is connected to the cathode of the LED light, described to open
The drain electrode for closing metal-oxide-semiconductor is connected to the anode of the LED light, the gate pole and the source electrode for switching metal-oxide-semiconductor of the switch metal-oxide-semiconductor it
Between be connected with the first divider resistance, be connected with the second partial pressure between the gate pole of the switch metal-oxide-semiconductor and the drive control circuit
Resistance.Exemplified by switching metal-oxide-semiconductor Q1, the first divider resistance R1, the second divider resistance R13, LED light LED1, switch metal-oxide-semiconductor Q1's
Source electrode is connected to the cathode of the LED1 lamps, and the drain electrode of the switch metal-oxide-semiconductor Q1 is connected to the anode of the LED1 lamps, described to open
Close and be connected with the first divider resistance R1, the switch metal-oxide-semiconductor between the gate pole of metal-oxide-semiconductor Q1 and the source electrode of the switch metal-oxide-semiconductor Q1
The second divider resistance R13 is connected between the gate pole of Q1 and the drive control circuit.The switch metal-oxide-semiconductor uses PMOS tube,
Its Vgs conducting voltage is -3V--20V.
Such as Fig. 3, the constant-current drive circuit is DC-DC constant-current drive circuits or linear constant current circuit.It is preferred that the constant current
Drive circuit is DC-DC constant-current drive circuits, and the unnecessary loss of device is reduced so in on-off circuit on or off.Specifically
Ground, the constant-current drive circuit include dc-dc, the tenth resistance R10, the 20th resistance R20, the first diode D1, the
One inductance L1；The tenth resistance is parallel between the power voltage terminal VIN and output current induction end SEN of the dc-dc
R10 and the 20th resistance R20, the cathode of power voltage terminal VIN connections the first diode D1 of the dc-dc,
The anode of the first diode D1 connects the output switching terminal SW of the dc-dc；Described tenth resistance R10 one end connects
The power supply is connect, the other end connects the cathode LED+ of the pixel dot circuit；The output switching terminal SW warps of the dc-dc
The anode LED- of the first inductance L1 connections pixel dot circuit.The constant-current drive circuit further includes filter branch, institute
Filter branch is stated to be arranged between the power supply and the tenth resistance R10.The filter branch includes the first electricity parallel with one another
Hold C1, the 3rd capacitance C3, and the first capacitance C1, the 3rd capacitance C3 are all connected between the power supply and ground connection GND.Wherein, institute
State dc-dc and the constant current of MBI6655 types, high brightness dc-dc may be selected so that after the constant-current drive circuit
LED+ output voltages it is approximate or equal to supply voltage.
Such as Fig. 5, drive control circuit described in an embodiment includes drive control chip and its peripheral circuit；The driving
Constant current output end DUTCO, DUTB0 of control chip, DUTA0, DUTC1, DUTB1, DUTA1, DUTC2, DUTB2, DUTA2,
DUTC3, DUTB3, DUTA3 connect the on-off circuit.Wherein, the drive control chip uses MY9221SS cake cores；And
The chip has 12 ports to connect 12 on-off circuits, controls the break-make of 12 on-off circuits, greatly reduces original driving control
The quantity of circuit processed, further reduces lamps and lanterns scale.Wherein, other Serial Extension chips also can be selected in drive control chip,
And chip output is open collector or open-drain, such as TM1812, SM16712P, UCS9812, DM621 etc..
When driving passage less, the embodiment shown in another embodiment alternate figures 5 shown in Fig. 6 is driven in Fig. 4
Switch metal-oxide-semiconductor or other identical functions switching device.Specifically, the drive control circuit includes driving triode, drives
Dynamic resistance；Gate pole of the collector of the driving triode through the driving resistance connection switch metal-oxide-semiconductor, the driving three
The emitter ground connection of pole pipe, the base stage of the driving triode connect second divider resistance.The drive control circuit has more
A, each circuit is corresponded to and is connected with an on-off circuit.By wherein all the way exemplified by, the collector of driving triode Q7 is through the drive
The gate pole of the dynamic resistance R7 connections switch metal-oxide-semiconductor Q1, the emitter ground connection of the driving triode Q7, driving triode Q7's
Base stage connects the second divider resistance R13.When driving passage less, using the drive control electricity with driving triode
The shut-off of simple, the effective driving switch circuit in road.Wherein, the driving triode also can be by other same work(such as driving metal-oxide-semiconductor
The switching device of energy substitutes.
The utility model, can be by a constant-current drive circuit, a pixel electricity according to situations such as pel array
Road, multiple switch circuit form one group of pixel driver path, then the more pixel drive systems of the LED include multigroup pixel driver
Path, can so be arranged multigroup pixel driver path according to lamps and lanterns pixel request.When there is two groups of pixel driver paths, and
Image element circuit in every group has 6 LED light, there is 6 on-off circuits, then referring to upper figure exemplified by, carry out principle analysis.Drive control
Chip DIM1 ~ DIM12, if output is high-impedance state, switching tube is because effect VGS=0 of RGS, switching tube cut-off, LED normal points
It is bright.As R1 in driving chip DIM1 output low levels, corresponding switch MOS Q1, R13 is to 24V partial pressures（LED+ terminal voltages approach
Supply voltage 24v）, Q1 VGS voltages are -12V, and Q1 conductings LED1 extinguishes.Low level, the corresponding R2 of Q2 are exported if DIM2
Upper terminal voltage is supply voltage 24V-LED1 voltages, Q2 VGS are approximately-（24V-Vf（LED1））/2=-10.5V.Equally can be with
Extinguish LED2.And so on, closer to LED- in LED strings, corresponding switch metal-oxide-semiconductor VGS is lower, when only DIM6 outputs are low
During level, terminal voltage is 24V-VF (LED1 ~ LED5) on the corresponding R6 of Q6, is approximately (24V-15V)/2=4.5V.Led using low
Energization compress switch metal-oxide-semiconductor can equally ensure Q6 turn on, LED6 extinguish.In this way, when the drive control using 12 ports
During chip, every 6 ports connect one group of pixel driver path；12 on-off circuits carry out cut-offfing control according to above-mentioned principle.
Different from existing scheme, the utility model LED employs the mode of series connection, and constant-current circuit is operated in servo condition,
The electric current of all-the-time stable LED strings, in every LED both ends parallel connection controllable switch circuit, LED in parallel therewith during switch closure because
It is short-circuited and extinguishes, electric current flows anew through LED when switching off, and LED in parallel is lighted therewith, and corresponding drive control circuit passes through
On and off of the PWM mode control per way control switch, realizes the effect individually adjusted per LED.The utility model plurality of LEDs string
Connection only need to use constant-current circuit, and supply voltage no longer needs low pressure all the way, and outdoor lamp can be selected often to use 24V power supplys.
Using the lamps and lanterns of the utility model drive system, have the advantage that：
1. the requirement of pair power supply is low, it is not necessary to uses low-voltage high-current power source；
2. circuit is simple, in the case of realizing same function, originally a control passage needs a constant-current drive circuit,
According to this scheme, multiple control passages share a constant current driving, substantially reduce complexity in circuits.
3. cost reduction, the cost of on-off circuit is much smaller than the cost of constant-current drive circuit, reduces constant-current drive circuit,
Whole lamp cost substantially reduces.
It should be understood by those skilled in the art that the embodiment of the utility model shown in foregoing description and attached drawing is only used as
Illustrate and be not intended to limit the utility model.The purpose of this utility model completely effectively realizes.The function of the utility model
And structural principle shows and illustrates in embodiment, under without departing from the principle, the embodiment of the utility model can
To have any deformation or modification.
Claims (10)
1. a kind of more pixel drive systems of LED, it is characterised in that including power supply, constant-current drive circuit, pixel dot circuit, open
Powered-down road, drive control circuit；The pixel dot circuit is made of the LED light of multiple series connection；The on-off circuit have it is multiple and
A LED light both ends being each parallel in the pixel dot circuit, each on-off circuit are also respectively connected with the drive control
Circuit；The power supply is sequentially connected the constant-current drive circuit, the pixel dot circuit；Wherein, the on-off circuit includes opening
Metal-oxide-semiconductor or switching transistor are closed, the drive control circuit is to make the open collector or switch MOS of the switching transistor
The circuit of the open-drain output of pipe.
2. the more pixel drive systems of a kind of LED according to claim 1, it is characterised in that the on-off circuit includes
When switching metal-oxide-semiconductor, the on-off circuit further includes the first divider resistance, the second divider resistance；The source electrode of the switch metal-oxide-semiconductor connects
The cathode of the LED light is connected on, the drain electrode of the switch metal-oxide-semiconductor is connected to the anode of the LED light, the switch metal-oxide-semiconductor
The first divider resistance, the gate pole of the switch metal-oxide-semiconductor and the driving are connected between the source electrode of gate pole and the switch metal-oxide-semiconductor
The second divider resistance is connected between control circuit.
A kind of 3. more pixel drive systems of LED according to claim 1, it is characterised in that the constant-current drive circuit
For DC-DC constant-current drive circuits.
A kind of 4. more pixel drive systems of LED according to claim 3, it is characterised in that the constant-current drive circuit
Including dc-dc, the tenth resistance, the 20th resistance, the first diode, the first inductance；The power supply of the dc-dc
The tenth resistance and the 20th resistance, the power supply electricity of the dc-dc are parallel between voltage end and output current induction end
The cathode of first diode described in press bond, the switch of the anode connection dc-dc of first diode are defeated
Outlet；Described tenth resistance one end connects the power supply, and the other end connects the cathode of the pixel dot circuit；The DC-DC turns
Anode of the output switching terminal of parallel operation through pixel dot circuit described in first inductance connection.
A kind of 5. more pixel drive systems of LED according to claim 4, it is characterised in that the constant-current drive circuit
Filter branch is further included, the filter branch is arranged between the power supply and the tenth resistance.
6. the more pixel drive systems of a kind of LED according to claim 1, it is characterised in that the power supply is 24 volts of electricity
Source.
A kind of 7. more pixel drive systems of LED according to claim 1, it is characterised in that the drive control circuit
Including drive control chip and its peripheral circuit, the Constant current output end of the drive control chip connects the on-off circuit.
A kind of 8. more pixel drive systems of LED according to claim 2, it is characterised in that the drive control circuit
Including driving triode, driving resistance；The collector of the driving triode connects the switch metal-oxide-semiconductor through the driving resistance
Gate pole, the emitter ground connection of the driving triode, the base stage of the driving triode connects second divider resistance.
9. the more pixel drive systems of a kind of LED according to claim 1, it is characterised in that the switch metal-oxide-semiconductor uses
PMOS tube, Vgs conducting voltages scope are -3V--20V.
A kind of 10. more pixel drive systems of LED according to claim 1, it is characterised in that a constant current driving
Circuit, an image element circuit, multiple switch circuit form one group of pixel driver path；The more pixel drivetrains of LED
System includes multigroup pixel driver path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721219624.8U CN207321594U (en) | 2017-09-22 | 2017-09-22 | A kind of more pixel drive systems of LED |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721219624.8U CN207321594U (en) | 2017-09-22 | 2017-09-22 | A kind of more pixel drive systems of LED |
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| CN207321594U true CN207321594U (en) | 2018-05-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107493635A (en) * | 2017-09-22 | 2017-12-19 | 浙江晶日照明科技有限公司 | A kind of more pixel drive systems of LED |
| CN108882451A (en) * | 2018-07-11 | 2018-11-23 | 广州市邦控自动化科技有限公司 | A kind of multi-way LED lamp Constant Current Control System |
-
2017
- 2017-09-22 CN CN201721219624.8U patent/CN207321594U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107493635A (en) * | 2017-09-22 | 2017-12-19 | 浙江晶日照明科技有限公司 | A kind of more pixel drive systems of LED |
| CN108882451A (en) * | 2018-07-11 | 2018-11-23 | 广州市邦控自动化科技有限公司 | A kind of multi-way LED lamp Constant Current Control System |
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Address after: 313000 Fulu Road 2008, East New District, Wuxing District, Huzhou City, Zhejiang Province Patentee after: Zhejiang Jingri Science and Technology Co., Ltd. Address before: 313000 Fulu Road 2008, East New District, Wuxing District, Huzhou City, Zhejiang Province Patentee before: Zhejiang Jingri Lighting Technology Co., Ltd. |
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