CN102364569A - Linear constant-current driving control circuit and light emitting diode (LED) display thereof - Google Patents
Linear constant-current driving control circuit and light emitting diode (LED) display thereof Download PDFInfo
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- CN102364569A CN102364569A CN2011103709035A CN201110370903A CN102364569A CN 102364569 A CN102364569 A CN 102364569A CN 2011103709035 A CN2011103709035 A CN 2011103709035A CN 201110370903 A CN201110370903 A CN 201110370903A CN 102364569 A CN102364569 A CN 102364569A
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Abstract
The invention provides a linear constant-current driving control circuit, which is used for making a plurality of light emitting diode (LED) lamps operate in a constant current state. The linear constant-current driving control circuit comprises a switch voltage-stabilizing power circuit, a digital potentiometer, a micro control unit (MCU) and a control circuit, wherein the switch voltage-stabilizing power circuit is used for outputting voltage which is required for the plurality of LED lamps; the digital potentiometer is used for controlling the voltage which is output by the switch voltage-stabilizing power circuit; the MCU is used for accurately controlling the resistance variation of the digital potentiometer; the control circuit is used for controlling the plurality of LED lamps to make the plurality of LED lamps always in the constant current state; the digital potentiometer is electrically connected between the switch voltage-stabilizing power circuit and the MCU; and the control circuit is electrically connected to the plurality of LED lamps. By adoption of the linear constant-current driving control circuit, the variation accuracy and stability of control voltage are improved, so that the consistency and stability of a display effect of a liquid crystal display (LCD) in different environments are more highlighted. The invention also provides an LED display with the linear constant-current driving control circuit.
Description
Technical field
The present invention relates to be applied to the control circuit field of the light-emitting diode display of Aeronautics and Astronautics, be specifically related to the linear constant-current driving control circuit of a kind of digital dynamic compensation LED step-down and have 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.
Summary of the invention
In view of this, the present invention 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 present invention 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 of this AD5252BR (W1, A1) electrically connects with two control ports (SCL, SDA) of this MCU respectively.
Further improvement as such scheme; This control circuit comprises metal-oxide-semiconductor, triode, some resistance (R2, R3, R4, R5, R6) and operational amplifier; The source electrode of this metal-oxide-semiconductor is via the electrical ground connection of resistance (R2); 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 (R4), 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 (R6, R5); Pwm signal is by inserting between two resistance (R6, R5), and the collector of this triode and emitter are connected in parallel on the two ends of this resistance (R3), 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, electric capacity (C1, C2, C3), resistance, inductance and diode; The input end of this switching power supply chip (VIN) receives input voltage and via the electrical ground connection of electric capacity (C1); The Enable Pin of this switching power supply chip (EN) connects the control port of this MCU; The port of this switching power supply chip (RT) is via the electrical ground connection of resistance, and the feedback end of this switching power supply chip (FB) is electrically connected at this digital current potential device, and the port of this switching power supply chip (BOOT) is electrically connected at the concussion end (SW) of this switching power supply chip via electric capacity (C2); The concussion end (SW) of this switching power supply chip also is electrically connected to the anode of these some LED etc. 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 electric capacity (C3) is parallel to this diode.
As the further improvement of such scheme, this switching power supply chip is the LM22677-ADJ chip.
The invention still further relates to a kind of 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.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 of this AD5252BR (W1, A1) electrically connects with two control ports (SCL, SDA) of this MCU respectively.
Further improvement as such scheme; This control circuit comprises metal-oxide-semiconductor, triode, some resistance (R2, R3, R4, R5, R6) and operational amplifier; The source electrode of this metal-oxide-semiconductor is via the electrical ground connection of resistance (R2); 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 (R4), 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 (R6, R5); Pwm signal is by inserting between two resistance (R6, R5), and the collector of this triode and emitter are connected in parallel on the two ends of this resistance (R3), 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, electric capacity (C1, C2, C3), resistance, inductance and diode; The input end of this switching power supply chip (VIN) receives input voltage and via the electrical ground connection of electric capacity (C1); The Enable Pin of this switching power supply chip (EN) connects the control port of this MCU; The port of this switching power supply chip (RT) is via the electrical ground connection of resistance, and the feedback end of this switching power supply chip (FB) is electrically connected at this digital current potential device, and the port of this switching power supply chip (BOOT) is electrically connected at the concussion end (SW) of this switching power supply chip via electric capacity (C2); The concussion end (SW) of this switching power supply chip also is electrically connected to the anode of these some LED etc. 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 electric capacity (C3) 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 provided by the invention and light-emitting diode display thereof; 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 present invention 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 preferred embodiments of the present invention.
Symbol description
| Light- |
100 |
| LED lamp string | D11, D22, D33 ..., Dnn; D1m, D2m, D3m ..., Dnm |
| The switching |
10 |
| Digital current potential device | U2 |
| MCU | |
| Control circuit | |
| 20 | |
| Two ends | W1, A1 |
| Control port | SCL, SDA |
| Metal-oxide-semiconductor | Q1 |
| Triode | Q2 |
| Resistance | R1, R2, R3, R4, R5, R6 |
| Operational amplifier | U4 |
| The switching power supply chip | U1 |
| Electric capacity | C1, C2, C3 |
| Inductance | L1 |
| Diode | VD1 |
| Pin | 1 ~ 7 |
| Enable Pin | EN |
| Input end | VIN |
| Port | BOOT, RT |
| Feedback end | FB |
| The concussion end | SW |
| The ground port | GND |
。Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention 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 present invention, and be not used in qualification the present invention.
See also Fig. 1, a kind of light-emitting diode display 100 that preferred embodiments of the present invention 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, the D33 of many row's parallel connections ..., Dnn; 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.
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 this some LED etc. 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 present invention 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 preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
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 of this AD5252BR (W1, A1) electrically connects with two control ports (SCL, SDA) of this MCU 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, some resistance (R2, R3, R4, R5, R6) and operational amplifier; The source electrode of this metal-oxide-semiconductor is via the electrical ground connection of resistance (R2), 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 (R4); 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 (R6, R5), and pwm signal is by inserting between two resistance (R6, R5); The collector of this triode and emitter are connected in parallel on the two ends of this resistance (R3), 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, electric capacity (C1, C2, C3), resistance, inductance and diode; The input end of this switching power supply chip (VIN) receives input voltage and via the electrical ground connection of electric capacity (C1); The Enable Pin of this switching power supply chip (EN) connects the control port of this MCU; The port of this switching power supply chip (RT) is via the electrical ground connection of resistance, and the feedback end of this switching power supply chip (FB) is electrically connected at this digital current potential device, and the port of this switching power supply chip (BOOT) is electrically connected at the concussion end (SW) of this switching power supply chip via electric capacity (C2); The concussion end (SW) of this switching power supply chip also is electrically connected to the anode of these some LED etc. 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 electric capacity (C3) 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110370903.5A CN102364569B (en) | 2011-11-21 | 2011-11-21 | A kind of linear constant current Drive and Control Circuit and light-emitting diode display thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110370903.5A CN102364569B (en) | 2011-11-21 | 2011-11-21 | A kind of linear constant current Drive and Control Circuit and light-emitting diode display thereof |
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| CN102364569A true CN102364569A (en) | 2012-02-29 |
| CN102364569B CN102364569B (en) | 2015-11-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103179756A (en) * | 2013-03-19 | 2013-06-26 | 深圳市明微电子股份有限公司 | LED (light-emitting diode) linear constant current drive controller with wide input voltage range |
| CN103618467A (en) * | 2013-12-10 | 2014-03-05 | 惠州市华阳光电技术有限公司 | Control method for improving constant-current accuracy of capacitance resisting and voltage reduction circuit |
| CN103617788A (en) * | 2013-12-04 | 2014-03-05 | 中航华东光电有限公司 | Circuit for controlling day and night mode 6500K color temperature of LCD |
| CN104486888A (en) * | 2014-12-26 | 2015-04-01 | 青岛歌尔声学科技有限公司 | LED constant-current drive circuit |
| CN110534055A (en) * | 2019-08-29 | 2019-12-03 | 广东美的制冷设备有限公司 | Display panel of air-conditioner and air conditioner |
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Cited By (6)
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| CN103179756A (en) * | 2013-03-19 | 2013-06-26 | 深圳市明微电子股份有限公司 | LED (light-emitting diode) linear constant current drive controller with wide input voltage range |
| CN103617788A (en) * | 2013-12-04 | 2014-03-05 | 中航华东光电有限公司 | Circuit for controlling day and night mode 6500K color temperature of LCD |
| CN103617788B (en) * | 2013-12-04 | 2016-03-02 | 中航华东光电有限公司 | Control the circuit of LCD display pattern colour temperature 6500K round the clock |
| CN103618467A (en) * | 2013-12-10 | 2014-03-05 | 惠州市华阳光电技术有限公司 | Control method for improving constant-current accuracy of capacitance resisting and voltage reduction circuit |
| CN104486888A (en) * | 2014-12-26 | 2015-04-01 | 青岛歌尔声学科技有限公司 | LED constant-current drive circuit |
| CN110534055A (en) * | 2019-08-29 | 2019-12-03 | 广东美的制冷设备有限公司 | Display panel of air-conditioner and air conditioner |
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| CN102364569B (en) | 2015-11-18 |
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