CN108319320B - OLED screen signal generator with stable power supply - Google Patents
OLED screen signal generator with stable power supply Download PDFInfo
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- CN108319320B CN108319320B CN201810273438.5A CN201810273438A CN108319320B CN 108319320 B CN108319320 B CN 108319320B CN 201810273438 A CN201810273438 A CN 201810273438A CN 108319320 B CN108319320 B CN 108319320B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
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- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
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- 208000033707 Early-onset X-linked optic atrophy Diseases 0.000 description 8
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- 101100015484 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GPA1 gene Proteins 0.000 description 7
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
Abstract
The invention relates to a power-stable OLED screen signal generator, which comprises an ARM processor, a first I 2 The C communication end is connected with the input end of a first analog-to-digital conversion module, the output end of the first analog-to-digital conversion module is connected with the input end of a first operational amplifier, and the output end of the first operational amplifier is connected with the voltage feedback end of a direct current-to-direct current module; second I of the processor 2 The C communication end is connected with the input end of a second analog-to-digital conversion module, the output end of the second analog-to-digital conversion module is connected with the input end of a second operational amplifier, and the output end of the second operational amplifier is connected with the voltage feedback end of a low-dropout linear voltage regulator; the voltage input end of the direct current-to-direct current module is connected with a power supply, the output end of the direct current-to-direct current module is connected with the voltage input end of the low-dropout linear voltage regulator, and the voltage output end of the low-dropout linear voltage regulator provides the power supply for the OLED screen.
Description
Technical Field
The invention belongs to the field of photoelectricity, and particularly relates to an OLED screen signal generator, in particular to a control circuit of an OLED screen signal generator with stable power supply.
Background
An Organic Light-Emitting Diode (OLED) is also called an Organic laser display, an Organic Light-Emitting semiconductor. Is found in the laboratory in 1979 by professor of american chinese Deng Qingyun (child w.tang). The OLED display technology has the advantages of self-luminescence, wide viewing angle, almost infinite contrast, low power consumption, extremely high reaction speed and the like, and is widely applied to the field of display screens.
At present, because various OLED screen manufacturers focus on the accurate and stable voltage of a plurality of paths for supplying power to the OLED screen, lines, abnormal pictures, jitters of pictures and other phenomena can occur when the screen is clicked, and the screen can be burnt when serious. Various bad factors can seriously affect the picture output stability of the OLED screen.
In view of this, in order to solve this problem, it is the subject of the present invention to propose an OLED screen signal generator with stable power supply.
Disclosure of Invention
The invention provides an OLED screen signal generator with stable power supply, and aims to solve the problems that the signal generator in the prior art has poor voltage stability for supplying power to an OLED screen, so that phenomena such as lines, abnormal pictures, picture shaking and the like can occur when the screen is clicked, and the screen can be burnt when the screen is seriously damaged.
In order to achieve the above purpose, the invention adopts the following technical scheme: a power stable OLED screen signal generator comprises an ARM processor, a first I of the processor 2 The C communication end is connected with the input end of a first analog-to-digital conversion module, the output end of the first analog-to-digital conversion module is connected with the input end of a first operational amplifier, and the output end of the first operational amplifier is connected with the voltage feedback end of a direct current-to-direct current module;
second I of the processor 2 The C communication end is connected with the input end of a second analog-to-digital conversion module, the output end of the second analog-to-digital conversion module is connected with the input end of a second operational amplifier, and the output end of the second operational amplifier is connected with the voltage feedback end of a low-dropout linear voltage regulator;
the voltage input end of the direct current-to-direct current module is connected with a power supply, the output end of the direct current-to-direct current module is connected with the voltage input end of the low-dropout linear voltage regulator, and the voltage output end of the low-dropout linear voltage regulator provides the power supply for the OLED screen.
The relevant content explanation in the technical scheme is as follows:
1. in the above scheme, the processor adopts a processor with a model of TM4C123G, and the first I of the processor 2 The C communication end is connected with a first analog-to-digital conversion module with the model of DAC121C085CIMM, the voltage output end of the first analog-to-digital conversion module is connected with the non-inverting input end of a first operational amplifier serving as a follower, the output end of the first operational amplifier is grounded through a first resistor and a second resistor, and the output voltage of the first operational amplifier is formed by the first resistor and the second resistorAnd dividing voltage by resistors, and taking divided voltage between the first resistor and the second resistor as voltage feedback input of a direct current-to-direct current module with the model of TPS54561 DPRR.
2. In the above scheme, the second I of the processor 2 The C communication end is connected with a second analog-to-digital conversion module with the model of DAC121C085CIMM, and the voltage output end of the first analog-to-digital conversion module is output to the voltage feedback end of the low-dropout linear voltage regulator with the model of LT3757AEDD through a two-stage operational amplifier.
3. In the above scheme, the two-stage operational amplifier includes a second operational amplifier and a third operational amplifier, an output end of the second analog-to-digital conversion module is connected to a non-inverting input end of the second operational amplifier serving as a follower, an output end of the second operational amplifier is connected to an inverting input end of the second operational amplifier serving as an inverting amplifier, and an output end of the second operational amplifier is connected to a voltage feedback end of the low-dropout linear regulator.
4. In the above scheme, the GATE pin of the low dropout linear regulator is connected to the GATE of the mosfet with the model CSD18532Q5B, the source of the mosfet is grounded through a resistor, and the drain of the mosfet outputs a smooth voltage through a conjugate inductor and a filter circuit and is used as the direct supply voltage of the OLED screen.
5. In the above scheme, the output voltage calculation formula of the dc-dc conversion module is Vout 1=12 v-4.667×2.5 v (Dset/4096), where Dset is a preset value in the processor.
6. In the above scheme, the output voltage calculation formula of the low dropout linear regulator 6 is Vout 2= -12v+4.667×2.5v (Dset/4096), where Dset is a preset value in the ARM processor.
7. In the scheme, the current-voltage detection alarm output circuit further comprises a current-voltage detection alarm output circuit, wherein the current-voltage detection alarm output circuit comprises a shunt power monitor, the power supply voltage is connected to the input end of the shunt power monitor, and the output end of the shunt power monitor is connected to the communication pin 9 of the ARM processor.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
compared with the prior art, the invention adopts the high-speed ARM processor, has faster operation speed, more stability and better compatibility, and adopts the combined design of DC-DC plus/LDO, so that the output voltage range is wider, the current is larger, and the power supply noise is smaller. And moreover, a 16-bit DAC device is adopted, the voltage configuration precision is high, a high-precision zero Wen Piaoyun calculation amplifier is adopted, the output voltage is more accurate, and the lines are smaller. In addition, the invention adopts the design of overcurrent, overvoltage and overtemperature automatic protection, thereby greatly improving the absolute reliability of the circuit.
Drawings
FIG. 1 is a circuit block diagram of an OLED screen signal generator of this embodiment;
FIG. 2 is a circuit diagram of the DAC configuration DC-DC voltage output of the present embodiment;
FIG. 3 is a circuit diagram of the DAC configuration LDO voltage output of the present embodiment;
fig. 4 is a circuit diagram of current-voltage detection and alarm output in this embodiment.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples:
examples: OLED screen signal generator with stable power supply
Referring to FIG. 1, an ARM processor is provided, which includes a first I 2 The C communication end is connected with the input end of a first analog-to-digital conversion module DAC1, the output end of the first analog-to-digital conversion module DAC1 is connected with the input end of a first operational amplifier OPA1, and the output end of the first operational amplifier OPA is connected with the voltage feedback end of a direct current-to-direct current module DC-DC.
Second I of the processor 2 The communication end C is connected with the input end of a second analog-to-digital conversion module DAC2, the output end of the second analog-to-digital conversion module DAC2 is connected with the input end of a second operational amplifier OPA2, and the output end of the second operational amplifier OPA2 is connected with the voltage feedback end of a low dropout linear regulator LDO.
The voltage input end DC-DC_IN of the DC-DC module DC-DC is connected with a power supply, the output end of the DC-DC module DC-DC is connected with the voltage input end of the low dropout linear regulator LDO, and the voltage output end LDO OUT of the low dropout linear regulator LDO provides the power supply for the OLED screen.
Referring to fig. 2, a DC-DC voltage output of a DC-DC module is configured for the first analog-to-digital conversion module DAC1, in a range of 0V-12V: the processor adopts a processor with the model of TM4C123G, and the first I of the processor 2 The C communication end is connected with a first analog-digital conversion module DAC1 with the model of DAC121C085CIMM, the voltage output end of the first analog-digital conversion module DAC1 is connected with the non-inverting input end of a first operational amplifier OPA1 serving as a follower, the output end of the first operational amplifier OPA1 is grounded through a first resistor R1 and a second resistor R2, the output voltage of the first operational amplifier OPA1 is divided by the first resistor R1 and the second resistor R2, and the divided voltage between the first resistor R1 and the second resistor R2 is taken as the voltage feedback input of a direct current-direct current module DC-DC with the model of TPS54561DPRR, namely the voltage feedback input is connected to a pin 6 of a TPS54561DPRR chip in FIG. 2.
Referring to fig. 3, the second analog-to-digital conversion module DAC2 is configured with a low dropout linear regulator LDO voltage output in the range of 0V-12V: second I of the processor 2 The communication end C is connected with a second analog-digital conversion module DAC2 with the model of DAC121C085CIMM, and the voltage output end of the first analog-digital conversion module DAC1 is output to the voltage feedback end of a low dropout linear regulator LDO with the model of LT3757AEDD through a two-stage operational amplifier, namely a pin 2 of the LT3757AEDD chip in FIG. 2. The voltage at the voltage output end of the TPS54561DPRR chip in fig. 2 (i.e. pin 9 of the TPS54561DPRR chip) is connected to the voltage input end of the LT3757AEDD low dropout linear regulator LDO in fig. 3, i.e. pin 9 of the LT3757AEDD chip in fig. 3 through filtering.
The two-stage operational amplifier comprises a second operational amplifier OPA2 and a third operational amplifier OPA3, wherein the output end of the second analog-to-digital conversion module DAC2 is connected with the non-inverting input end of the second operational amplifier OPA2 serving as a follower, the output end of the second operational amplifier OPA2 is connected with the inverting input end of the second operational amplifier OPA2 serving as an inverting amplifier, and the output end of the second operational amplifier OPA2 is connected with the voltage feedback end of the low dropout linear regulator LDO. The GATE pin of the LDO is connected to the GATE electrode of a MOSFET (metal oxide semiconductor field effect transistor) with the model of CSD18532Q5B, the source electrode of the MOSFET is grounded through a resistor, the drain electrode of the MOSFET outputs smooth voltage through a conjugate inductor L1 and a filter circuit and is used as the direct power supply voltage of the OLED screen, and the direct power supply voltage refers to the output of the MOSFET which is directly connected with the OLED screen.
In this embodiment, the first operational amplifier OPA1 and the second operational amplifier OPA2 both adopt OPA2188AID.
Referring to fig. 4, a current-voltage detection alarm output circuit is further included, the current-voltage detection alarm output circuit includes a shunt power monitor INA226, the supply voltage is connected to an input terminal of the shunt power monitor INA226, and an output terminal of the shunt power monitor INA226 is connected to the communication pin 9 of the ARM processor.
In this embodiment, when the current and voltage detection and alarm output circuit is used for voltage detection, the ARM processor performs I2C communication with the split power monitor INA226 in a query manner to obtain 6-channel voltage data. The interface sends a current acquisition command through the I2C communication interface, reading the cur_reg register of the INA 226. When voltage detection is performed, the ARM processor performs I2C communication with the split power monitor INA226 in a query manner to obtain 6-channel current data.
In this embodiment, after the voltages of DAC1 and DAC2 are set, the ARM processor starts to collect the actual output of the load end, and if the voltage difference between the two voltages exceeds 0.003V, the ARM processor starts the voltage compensation mechanism, so that the output voltage error is stabilized within 0.003.
In this embodiment, after the ARM finishes setting the DAC voltage, it starts to collect the actual output of the load end, and if the voltage difference between the ARM and the DAC voltage exceeds 0.003V, it starts the voltage compensation mechanism to make the output voltage error stable within 0.003. The calculation formula of the voltage:
VDDI = 12– 4.667*2.5*（Dset/4096）(V)
wherein D is a preset voltage value issued by the upper computer to the ARM and is represented by DWORD type, the value is issued to the DAC121C085 through the I2C interface for voltage configuration, and VDDI is a voltage value actually output by the LDO and is represented by float type.
When the voltage needs to be compensated, we calculate this time by the following formula: error value = 12-4.667 x 2.5 x (Dcomp/4096) (V). The value dcomp=1 to be compensated is calculated, and because the measurement value is larger, the reverse compensation performed here is to subtract the compensation value from the set value, and the value is the new set data written into the register, i.e. dnew_set=dset-Dcomp; the latest setting data is written into the EEPROM so as to be directly called next time, thereby completing the accurate output of the multi-path LDO voltage. Its interface is connected with I 2 The C communication interface sends a collect voltage command to read the bv_reg register of the I-split power monitor INA 226.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (6)
1. An OLED screen signal generator with stable power supply, characterized in that: comprises an ARM processor, a first I of the processor 2 The C communication end is connected with the input end of a first analog-to-digital conversion module (DAC 1), the output end of the first analog-to-digital conversion module (DAC 1) is connected with the input end of a first operational amplifier (OPA 1), and the output end of the first operational amplifier (OPA 1) is connected with the voltage feedback end of a direct current-to-direct current module (DC-DC);
second I of the processor 2 The communication end C is connected with the input end of a second analog-to-digital conversion module (DAC 2), the output end of the second analog-to-digital conversion module (DAC 2) is connected with the non-inverting input end of a second operational amplifier (OPA 2) serving as a follower, and the output end of the second operational amplifier (OPA 2)The output end of the third operational amplifier (OPA 3) is connected with the voltage feedback end of a low dropout linear voltage regulator (LDO);
the voltage input end (DC-DC_IN) of the direct current-to-direct current module (DC-DC) is connected with a power supply, the output end of the direct current-to-direct current module (DC-DC) is connected with the voltage input end of the low dropout linear regulator (LDO), and the voltage output end (LDO OUT) of the low dropout linear regulator (LDO) provides the power supply for the OLED screen.
2. The power stable OLED screen signal generator of claim 1 wherein: the processor adopts a processor with the model of TM4C123G, and the first I of the processor 2 The C communication end is connected with a first analog-digital conversion module (DAC 1) with the model of DAC121C085CIMM, the voltage output end of the first analog-digital conversion module (DAC 1) is connected with the non-inverting input end of a first operational amplifier (OPA 1) serving as a follower, the output end of the first operational amplifier (OPA 1) is grounded through a first resistor (R1) and a second resistor (R2), the output voltage of the first operational amplifier (OPA 1) is divided by the first resistor (R1) and the second resistor (R2), and the divided voltage between the first resistor (R1) and the second resistor (R2) is taken as the voltage feedback input of a direct current-direct current module (DC-DC) with the model of TPS54561 DPRR.
3. The power stable OLED screen signal generator of claim 1 or 2, wherein: the GATE pin of the low dropout linear regulator (LDO) is connected to the GATE of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) with the model of CSD18532Q5B, the source of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is grounded through a resistor, and the drain of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) outputs smooth voltage through a conjugate inductor (L1) and a filter circuit and is used as the direct power supply voltage of the OLED screen.
4. The power stable OLED screen signal generator of claim 3 wherein: the current-voltage detection alarm output circuit comprises a shunt power monitor (INA 226), the power supply voltage is connected to the input end of the shunt power monitor (INA 226), and the output end of the shunt power monitor (INA 226) is connected to the communication pin (9) of the ARM processor.
5. The power stable OLED screen signal generator of claim 1 wherein: the output voltage calculation formula of the direct current-direct current module (DC-DC) is Vout1 = 12 v-4.667 x 2.5 v (Dset/4096), wherein Dset is a preset value in the ARM processor.
6. The power stable OLED screen signal generator of claim 1 wherein: the output voltage calculation formula of the low dropout linear regulator (LDO) is Vout 2= -12v+4.667 x 2.5 v x (Dset/4096), wherein Dset is a preset value in the ARM processor.
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| CN201810273438.5A CN108319320B (en) | 2018-03-29 | 2018-03-29 | OLED screen signal generator with stable power supply |
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| CN201810273438.5A CN108319320B (en) | 2018-03-29 | 2018-03-29 | OLED screen signal generator with stable power supply |
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| CN108319320B true CN108319320B (en) | 2023-12-12 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005312141A (en) * | 2004-04-20 | 2005-11-04 | Fuji Electric Device Technology Co Ltd | Switching power supply device |
| CN103562988A (en) * | 2011-05-20 | 2014-02-05 | 伊格尼斯创新公司 | System and methods for extraction of threshold and mobility parameters in amoled displays |
| CN103683931A (en) * | 2013-12-27 | 2014-03-26 | 深圳市航嘉驰源电气股份有限公司 | Power supply switching circuit |
| CN208188717U (en) * | 2018-03-29 | 2018-12-04 | 苏州佳智彩光电科技有限公司 | A kind of OLED screen signal generator of powered stable |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100773088B1 (en) * | 2005-10-05 | 2007-11-02 | 한국과학기술원 | Active matrix oled driving circuit with current feedback |
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- 2018-03-29 CN CN201810273438.5A patent/CN108319320B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005312141A (en) * | 2004-04-20 | 2005-11-04 | Fuji Electric Device Technology Co Ltd | Switching power supply device |
| CN103562988A (en) * | 2011-05-20 | 2014-02-05 | 伊格尼斯创新公司 | System and methods for extraction of threshold and mobility parameters in amoled displays |
| CN103683931A (en) * | 2013-12-27 | 2014-03-26 | 深圳市航嘉驰源电气股份有限公司 | Power supply switching circuit |
| CN208188717U (en) * | 2018-03-29 | 2018-12-04 | 苏州佳智彩光电科技有限公司 | A kind of OLED screen signal generator of powered stable |
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