CN202434183U - Linear constant current driving control circuit and LED display thereof - Google Patents
Linear constant current driving control circuit and LED display thereof Download PDFInfo
- Publication number
- CN202434183U CN202434183U CN2011204636910U CN201120463691U CN202434183U CN 202434183 U CN202434183 U CN 202434183U CN 2011204636910 U CN2011204636910 U CN 2011204636910U CN 201120463691 U CN201120463691 U CN 201120463691U CN 202434183 U CN202434183 U CN 202434183U
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- power supply
- control circuit
- switching power
- resistance
- led lamps
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Abstract
The utility model provides a linear constant current driving control circuit which is used for making a plurality of LED lamps work under a constant current state. The linear constant current driving control circuit comprises: a switch stabilized power supply circuit used for outputting voltage needed by the plurality of LED lamps; a digital potentiometer used for controlling the switch stabilized power supply circuit to output the voltage; an MCU used for accurately controlling changes of resistance of the digital potentiometer; and a control circuit used for controlling the plurality of LED lamps to keep the plurality of LED lamps always under a constant current state. The digital potentiometer is electrically connected between the switch stabilized power supply circuit and the MCU. The control circuit is electrically connected to the plurality of LED lamps. The linear constant current driving control circuit helps to improve the changing precision and the stability of control voltage, and allows consistency and stability of a display effect of a LCD to be more prominent under different environments. The utility model also provides an LED display equipped with the above linear constant current driving control circuit.
Description
Technical field
The utility model relates to the control circuit field of the light-emitting diode display that is applied to Aeronautics and Astronautics, is specifically related to the linear constant-current driving control circuit of a kind of digital dynamic compensation LED step-down and has the light-emitting diode display of this linearity constant-current driving control circuit.
Background technology
Drive the field at LED, to the driving of LED boost, multiple modes such as step-down, the integrated chip that boosts.The self-control booster circuit since series LED lamp quantity more, exist can not draw partially, shortcomings such as bullet, and be not widely used; The mode of the integrated chip that boosts is large-scale popularization not as yet.
The utility model content
In view of this, the utility model provides the linear constant-current driving control circuit of a kind of digital dynamic compensation LED step-down and has the light-emitting diode display of this linearity constant-current driving control circuit.
The utility model is achieved in that a kind of linear constant-current driving control circuit, and it is used to make some LED lamps to be operated in constant current state, and it comprises the switching power supply circuit that is used to export the required voltage of these some LED lamps with these some LED lamps electric connections.Wherein, this linearity constant-current driving control circuit also comprise the output voltage that is used to control this switching power supply circuit digital current potential device, be used for accurately controlling this digital current potential device change in resistance MCU and be used to control these some LED lamps and make these some LED lamps remain at the control circuit of constant current state.This digital current potential device is electrically connected between this switching power supply circuit and this MCU, and this control circuit is electrically connected at this some LED lamps.
As the further improvement of such scheme, this digital current potential device is AD5252BR, and the two ends W1 of this AD5252BR, A1 electrically connect with two control port SCL of this MCU, SDA respectively.
Further improvement as such scheme; This control circuit comprises metal-oxide-semiconductor, triode, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6 and operational amplifier; The source electrode of this metal-oxide-semiconductor is via resistance R 2 electrical ground connection; The drain electrode of this metal-oxide-semiconductor is electrically connected to the negative electrode of these some LED lamps; The grid of this metal-oxide-semiconductor is electrically connected to the output terminal of this operational amplifier via resistance R 4, the homophase termination reference voltage of this operational amplifier, and the end of oppisite phase of this operational amplifier is electrically connected at the source electrode of this metal-oxide-semiconductor; The power supply termination power of this operational amplifier and be electrically connected to the base stage of this triode via two resistance R 6, R5; Pwm signal is by inserting between two resistance R 6, the R5, and the collector of this triode and emitter are connected in parallel on the two ends of this resistance R 3, and the collector of this triode is electrically connected at the grid of this metal-oxide-semiconductor.
Further improvement as such scheme; This switching power supply circuit comprises switching power supply chip, capacitor C 1, capacitor C 2, capacitor C 3, resistance, inductance and diode; The input end VIN of this switching power supply chip receives input voltage and via capacitor C 1 electrical ground connection; The Enable Pin EN of this switching power supply chip connects the control port of this MCU; The port RT of this switching power supply chip is via the electrical ground connection of resistance, and the feedback end FB of this switching power supply chip is electrically connected at this digital current potential device, and the port BOOT of this switching power supply chip is electrically connected at the concussion end SW of this switching power supply chip via capacitor C 2; The concussion end SW of this switching power supply chip also is electrically connected to the anode of these some LED lamps via inductance; The negative electrode of this diode is electrically connected at the concussion end SW of this switching power supply chip, the electrical ground connection of the anode of this diode, and this capacitor C 3 is parallel to this diode.
As the further improvement of such scheme, this switching power supply chip is the LM22677-ADJ chip.
The utility model also relates to a kind of light-emitting diode display, and it comprises some LED lamps and is used to make these some LED lamps to be operated in the linear constant-current driving control circuit of constant current state.This linearity constant-current driving control circuit comprises the switching power supply circuit that is used to export the required voltage of these some LED lamps with these some LED lamps electric connections.Wherein, this linearity constant-current driving control circuit also comprise the output voltage that is used to control this switching power supply circuit digital current potential device, be used for accurately controlling this digital current potential device change in resistance MCU and be used to control these some LED lamps and make these some LED lamps remain at the control circuit of constant current state.This digital current potential device is electrically connected between this switching power supply circuit and this MCU, and this control circuit is electrically connected at this some LED lamps.
As the further improvement of such scheme, this digital current potential device is AD5252BR, and the two ends W1 of this AD5252BR, A1 electrically connect with two control port SCL of this MCU, SDA respectively.
Further improvement as such scheme; This control circuit comprises metal-oxide-semiconductor, triode, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6 and operational amplifier; The source electrode of this metal-oxide-semiconductor is via resistance R 2 electrical ground connection; The drain electrode of this metal-oxide-semiconductor is electrically connected to the negative electrode of these some LED lamps; The grid of this metal-oxide-semiconductor is electrically connected to the output terminal of this operational amplifier via resistance R 4, the homophase termination reference voltage of this operational amplifier, and the end of oppisite phase of this operational amplifier is electrically connected at the source electrode of this metal-oxide-semiconductor; The power supply termination power of this operational amplifier and be electrically connected to the base stage of this triode via two resistance R 6, R5; Pwm signal is by inserting between two resistance R 6, the R5, and the collector of this triode and emitter are connected in parallel on the two ends of this resistance R 3, and the collector of this triode is electrically connected at the grid of this metal-oxide-semiconductor.
Further improvement as such scheme; This switching power supply circuit comprises switching power supply chip, capacitor C 1, capacitor C 2, capacitor C 3, resistance, inductance and diode; The input end VIN of this switching power supply chip receives input voltage and via capacitor C 1 electrical ground connection; The Enable Pin EN of this switching power supply chip connects the control port of this MCU; The port RT of this switching power supply chip is via the electrical ground connection of resistance, and the feedback end FB of this switching power supply chip is electrically connected at this digital current potential device, and the port BOOT of this switching power supply chip is electrically connected at the concussion end SW of this switching power supply chip via capacitor C 2; The concussion end SW of this switching power supply chip also is electrically connected to the anode of these some LED lamps via inductance; The negative electrode of this diode is electrically connected at the concussion end SW of this switching power supply chip, the electrical ground connection of the anode of this diode, and this capacitor C 3 is parallel to this diode.
As the further improvement of such scheme, this switching power supply chip is the LM22677-ADJ chip.
As the further improvement of such scheme, these some LED lamps are the LED lamp string of many row's parallel connections.
Linear constant-current driving control circuit and light-emitting diode display thereof that the utility model provides; Through the accurate control of MCU to digital potentiometer resistance variation; No matter under which kind of condition, make the LED lamp always work in constant current state, also control the LED lamp through metal-oxide-semiconductor Q1, triode Q2, operational amplifier U4 and some capacitance resistance components; Make LED lamp string remain at constant current state, thereby kept the consistance of LED lamp brightness.The utility model has improved homogeneity, consistance and the reliability of the lamp brightness of LED, makes to the consistance and the stability of the display effect of LCD more outstanding.
Description of drawings
The electrical block diagram of the light-emitting diode display that Fig. 1 provides for the utility model preferred embodiments.
Symbol description
Light-emitting diode display 100
LED lamp string D11, D22, D33......, Dnn; ...; D1m,
D2m、D3m、......、Dnm
Switching power supply circuit 10
Digital current potential device U2
MCU U3
Control circuit 20
Two ends W1, A1
Control port SCL, SDA
Metal-oxide-semiconductor Q1
Triode Q2
Resistance R 1, R2, R3, R4, R5, R6
Operational amplifier U4
Switching power supply chip U1
Capacitor C 1, C2, C3
Inductance L 1
Diode VD1
Pin 1 ~ 7
Enable Pin EN
Input end VIN
Port BOOT, RT
Feedback end FB
Concussion end SW
Ground port GND
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also Fig. 1, a kind of light-emitting diode display 100 that the utility model preferred embodiments provides comprises some LED lamps and is used to make these some LED lamps to be operated in the linear constant-current driving control circuit of constant current state.In this embodiment, these some LED lamps are LED lamp string D11, D22, D33......, the Dnn of many row's parallel connections; ...; D1m, D2m, D3m ..., Dnm.
The digital current potential device U2 of the output voltage that this linearity constant-current driving control circuit comprises the switching power supply circuit 10 that is used to export the required voltage of these some LED lamps, be used for CS voltage-stabilized power supply circuit 10, be used for accurate control figure formula potentiometer U2 change in resistance MCU U3 and be used to control these some LED lamps and make these some LED lamps remain at the control circuit 20 of constant current state.Digital current potential device U2 is electrically connected between switching power supply circuit 10 and the MCU U3, and control circuit 20 is electrically connected at this some LED lamps.
In this embodiment, digital current potential device U2 is AD5252BR, and the two ends W1 of this AD5252BR, A1 electrically connect with two control port SCL of MCU U3, SDA respectively.
Control circuit 20 comprises metal-oxide-semiconductor Q1; Triode Q2; Some resistance R 2, R3, R4, R5, R6; Operational amplifier U4.The source electrode of metal-oxide-semiconductor Q1 is via resistance R 2 electrical ground connection, and the drain electrode of metal-oxide-semiconductor Q1 is electrically connected to the negative electrode of these some LED lamps, and the grid of metal-oxide-semiconductor Q1 is electrically connected to the output terminal of operational amplifier U4 via resistance R 4.The homophase termination reference voltage Vref (it is from MCU U3) of operational amplifier U4; The end of oppisite phase of operational amplifier U4 is electrically connected at the source electrode of metal-oxide-semiconductor Q1; The power supply termination power of operational amplifier Q1 and be electrically connected to the base stage of triode Q2 via two resistance R 6, R5; Pwm signal (it is from MCU U3) is by inserting between two resistance R 6, the R5, and the collector of triode Q2 and emitter are connected in parallel on the two ends of resistance R 3, and the collector of triode Q2 is electrically connected at the grid of metal-oxide-semiconductor Q1.
Switching power supply circuit 10 comprises switching power supply chip U1; Capacitor C 1, C2, C3; Resistance R 1, inductance L 1 and diode VD1.In this embodiment, diode VD1 is a schottky diode; Switching power supply chip U1 is the LM22677-ADJ chip.
The input end VIN of switching power supply chip U1 (being pin 2) receives input voltage and via capacitor C 1 electrical ground connection; The Enable Pin EN of switching power supply chip U1 (being pin 7) connects the control port of MCU U3; The port RT of switching power supply chip U1 (being pin 5) is via resistance R 1 electrical ground connection; The feedback end FB of switching power supply chip U1 (being pin 6) is electrically connected at digital current potential device U2; The port BOOT of switching power supply chip U1 (being pin 3) is electrically connected at the concussion end SW (pin 1) of switching power supply chip U1 via capacitor C 2; The concussion end SW of switching power supply chip U1 also is electrically connected to the anode of these some LED lamps via inductance L 1, the ground port GND of switching power supply chip U1 (being pin 4) electrically connects.The negative electrode of diode VD1 is electrically connected at the concussion end SW of switching power supply chip U1, the electrical ground connection of the anode of diode VD1, and capacitor C 3 is parallel to diode VD1.
When MCU U3 detects the LED lamp under varying environment; Come the position of control figure formula potentiometer U2 (AD5252BR) vernier through the I2C bus; Thereby change the W1 of AD5252BR and the resistance value at A1 two ends; Then CS stabilized voltage supply chip U1 (LM22677-ADJ) output voltage V out, Vout is the required voltage of adjustment back LED lamp.The I2C control port SCL of MCU U3, SDA are connected respectively to W1 and the A1 two ends of digital current potential device chip AD5252BRU1 through lead; Through the I2C interface; Can very accurately control LED lamp required voltage, thereby guarantee LED lamp under high temperature, low temperature, normal temperature because the difference that self character caused.
In sum; The linear constant-current driving control circuit of light-emitting diode display, the accurate control that digital potentiometer resistance is changed through MCU is no matter under which kind of condition; Make the LED lamp always work in constant current state; Also control the LED lamp, make LED lamp string remain at constant current state, thereby kept the consistance of LED lamp brightness through metal-oxide-semiconductor Q1, triode Q2, operational amplifier U4 and some capacitance resistance components.The utility model has improved homogeneity, consistance and the reliability of the lamp brightness of LED, makes to the consistance and the stability of the display effect of LCD more outstanding.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
Claims (7)
1. linear constant-current driving control circuit; It is used to make some LED lamps to be operated in constant current state; It comprises the switching power supply circuit that is used to export the required voltage of these some LED lamps with these some LED lamps electric connections; It is characterized in that; This linearity constant-current driving control circuit also comprise the output voltage that is used to control this switching power supply circuit digital current potential device, be used for accurately controlling this digital current potential device change in resistance MCU and be used to control these some LED lamps and make these some LED lamps remain at the control circuit of constant current state; This digital current potential device is electrically connected between this switching power supply circuit and this MCU, and this control circuit is electrically connected at this some LED lamps.
2. linear constant-current driving control circuit as claimed in claim 1 is characterized in that, this digital current potential device is AD5252BR, and the two ends W1 of this AD5252BR, A1 electrically connect with two control port SCL of this MCU, SDA respectively.
3. linear constant-current driving control circuit as claimed in claim 1; It is characterized in that; This control circuit comprises metal-oxide-semiconductor, triode, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6 and operational amplifier; The source electrode of this metal-oxide-semiconductor is via resistance R 2 electrical ground connection, and the drain electrode of this metal-oxide-semiconductor is electrically connected to the negative electrode of these some LED lamps, and the grid of this metal-oxide-semiconductor is electrically connected to the output terminal of this operational amplifier via resistance R 4; The homophase termination reference voltage of this operational amplifier; The end of oppisite phase of this operational amplifier is electrically connected at the source electrode of this metal-oxide-semiconductor, the power supply termination power of this operational amplifier and be electrically connected to the base stage of this triode via two resistance R 6, R5, and pwm signal is by inserting between two resistance R 6, the R5; The collector of this triode and emitter are connected in parallel on the two ends of this resistance R 3, and the collector of this triode is electrically connected at the grid of this metal-oxide-semiconductor.
4. linear constant-current driving control circuit as claimed in claim 1; It is characterized in that; This switching power supply circuit comprises switching power supply chip, capacitor C 1, capacitor C 2, capacitor C 3, resistance, inductance and diode; The input end VIN of this switching power supply chip receives input voltage and via capacitor C 1 electrical ground connection, the Enable Pin EN of this switching power supply chip connects the control port of this MCU, and the port RT of this switching power supply chip is via the electrical ground connection of resistance; The feedback end FB of this switching power supply chip is electrically connected at this digital current potential device; The port BOOT of this switching power supply chip is electrically connected at the concussion end SW of this switching power supply chip via capacitor C 2, and the concussion end SW of this switching power supply chip also is electrically connected to the anode of these some LED lamps via inductance, and the negative electrode of this diode is electrically connected at the concussion end SW of this switching power supply chip; The electrical ground connection of the anode of this diode, this capacitor C 3 is parallel to this diode.
5. linear constant-current driving control circuit as claimed in claim 4 is characterized in that this switching power supply chip is the LM22677-ADJ chip.
6. light-emitting diode display; It comprises some LED lamps and is used to make these some LED lamps to be operated in the linear constant-current driving control circuit of constant current state that this linearity constant-current driving control circuit is like any described linear constant-current driving control circuit in the claim 1 to 5.
7. light-emitting diode display as claimed in claim 6 is characterized in that, these some LED lamps are the LED lamp string of many row's parallel connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204636910U CN202434183U (en) | 2011-11-21 | 2011-11-21 | Linear constant current driving control circuit and LED display thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204636910U CN202434183U (en) | 2011-11-21 | 2011-11-21 | Linear constant current driving control circuit and LED display thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202434183U true CN202434183U (en) | 2012-09-12 |
Family
ID=46783611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204636910U Withdrawn - After Issue CN202434183U (en) | 2011-11-21 | 2011-11-21 | Linear constant current driving control circuit and LED display thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202434183U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102364569A (en) * | 2011-11-21 | 2012-02-29 | 中航华东光电有限公司 | Linear constant-current driving control circuit and light emitting diode (LED) display thereof |
-
2011
- 2011-11-21 CN CN2011204636910U patent/CN202434183U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102364569A (en) * | 2011-11-21 | 2012-02-29 | 中航华东光电有限公司 | Linear constant-current driving control circuit and light emitting diode (LED) display thereof |
| CN102364569B (en) * | 2011-11-21 | 2015-11-18 | 中航华东光电有限公司 | A kind of linear constant current Drive and Control Circuit and light-emitting diode display thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120912 Effective date of abandoning: 20151118 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |