WO2021008384A1 - Système de réglage de rétroaction d'alimentation électrique et écran de visualisation - Google Patents

Système de réglage de rétroaction d'alimentation électrique et écran de visualisation Download PDF

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Publication number
WO2021008384A1
WO2021008384A1 PCT/CN2020/100016 CN2020100016W WO2021008384A1 WO 2021008384 A1 WO2021008384 A1 WO 2021008384A1 CN 2020100016 W CN2020100016 W CN 2020100016W WO 2021008384 A1 WO2021008384 A1 WO 2021008384A1
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WIPO (PCT)
Prior art keywords
power supply
module
voltage
constant current
current
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PCT/CN2020/100016
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English (en)
Chinese (zh)
Inventor
雷松
王金山
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深圳市洲明科技股份有限公司
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Publication of WO2021008384A1 publication Critical patent/WO2021008384A1/fr

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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
    • 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
    • G05F1/575—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 characterised by the feedback circuit

Definitions

  • the present invention relates to the technical field of power detection, in particular to a power supply feedback adjustment system and a display screen.
  • LED display screens are usually composed of multiple pixels arranged in a matrix. Each pixel is usually composed of green light-emitting diodes, blue light-emitting diodes and red light-emitting diodes. Different colors of light-emitting diodes have different minimum supply voltages due to differences in materials. That is to say, the minimum voltage values required for light-emitting diodes of different colors are different.
  • the supply voltage required by the red light-emitting diode is generally lower than the supply voltage required by the green light-emitting diode or the blue light-emitting diode.
  • multiple light-emitting diodes of the same color may have different minimum power supply voltages due to different specifications.
  • the luminous intensity of the same light-emitting diode is proportional to the required current value.
  • the minimum power supply voltage required corresponding to them also differs. Therefore, only the minimum power supply voltage of the light emitting diode of the display screen needs to be measured, and the light emitting diode of the display screen can be powered by the shunt power supply mode, thereby reducing the power consumption of the display screen.
  • the light-emitting diode is usually measured by a stepwise adjustment test method.
  • the minimum power supply voltage of the light-emitting diode is confirmed by slowly increasing or decreasing the power supply voltage of the light-emitting diode and observing whether the luminous intensity of the light-emitting diode changes.
  • the above method is troublesome to measure, the test efficiency is low, and the measurement error is large.
  • a power supply feedback regulation system which includes a processing module, a current detection module, a constant current drive module, and a stabilized power supply module; the input end of the stabilized power supply module is used to connect to a power source, and the output end of the stabilized power supply module is connected to The input end of the constant current drive module is connected, the output end of the constant current drive module is connected to the light emitting diode, the output end of the constant current drive module is connected to the input end of the current detection module, and the current The output terminal of the detection module is connected with the detection input terminal of the processing module, and the control output terminal of the processing module is connected with the regulation terminal of the stabilized power supply module; the processing module is used to detect the power supply through the current detection module.
  • the turning voltage of the constant current drive module is obtained, and according to the constant current drive module
  • the current output by the driving module and the corresponding function formula of the voltage and current of the light-emitting diode are used to obtain the working voltage of the light-emitting diode.
  • the power supply voltage is calculated and controlled,
  • the regulated power supply module outputs the power supply voltage.
  • the processing module is configured to control the regulated power supply module to output a first voltage greater than a preset threshold voltage, so that the constant current drive module outputs a maximum current.
  • the processing module is configured to detect the maximum current output by the constant current drive module through the current detection module, and according to the maximum current output by the constant current drive module and the constant current drive module The corresponding function formula of voltage and current is used to obtain the transition voltage of the constant current drive module. According to the maximum current output by the constant current drive module and the corresponding function formula of the voltage and current of the light emitting diode, the corresponding function formula of the light emitting diode is obtained. Operating Voltage.
  • the transition voltage of the constant current drive module is the minimum voltage corresponding to the maximum current output by the constant current drive module.
  • the processing module is further configured to add the turning voltage, the operating voltage, and the preset voltage to calculate the power supply voltage, and control the regulated power supply module to output the power supply voltage .
  • the stabilized power supply module includes a resistor R1, a digital potentiometer, and a stabilized power supply chip, the input end of the stabilized power supply chip is used to connect to a power source, and the output end of the stabilized power supply chip is connected to The input end of the constant current drive module is connected, the output end of the stabilized power supply chip is also connected to the first resistance output end of the digital potentiometer, and the second resistance output end of the digital potentiometer is connected to the The feedback terminal of the regulated power supply chip is connected, the feedback terminal of the regulated power supply chip is also used for grounding through the resistor R1, and the regulating terminal of the digital potentiometer is connected with the control output terminal of the processing module.
  • the stabilized power supply module includes a resistor R1, a digital potentiometer, and a stabilized power supply chip, the input end of the stabilized power supply chip is used to connect to a power source, and the output end of the stabilized power supply chip is connected to The input terminal of the constant current drive module is connected, the output terminal of the regulated power supply chip is connected with the first terminal of the resistor R1, and the second terminal of the resistor R1 is connected with the feedback terminal of the regulated power supply chip , The second end of the resistor R1 is also connected to the first resistance output end of the digital potentiometer, the second resistance output end of the digital potentiometer is used for grounding, and the adjustment end of the digital potentiometer is connected to the The control output terminal of the processing module is connected.
  • the current detection module includes a current sensor and an analog-to-digital converter
  • the input terminal of the current sensor is connected to the output terminal of the constant current drive module
  • the output terminal of the current sensor is connected to the output terminal of the constant current drive module.
  • the input terminal of the analog-digital converter is connected, and the output terminal of the analog-digital converter is connected with the input terminal of the processing module.
  • the current sensor is a Hall current sensor.
  • an LED display screen is provided, including the power supply feedback adjustment system described in any of the above embodiments.
  • the above-mentioned power supply feedback adjustment system supplies power to the constant current drive module through the stabilized power supply module, so that the constant current drive module outputs current, and the processing module obtains the turning voltage of the constant current drive module and the operation of the light emitting diode according to the current output by the constant current drive module.
  • Voltage according to the transition voltage and the operating voltage of the light-emitting diode, obtain the minimum power supply voltage of the light-emitting diode, realize the measurement of the minimum power supply voltage of the light-emitting diode, and realize the function of feedback adjustment by controlling the output power supply voltage of the regulated power supply module.
  • Fig. 1 is a structural block diagram of the power supply feedback adjustment system in an embodiment
  • Fig. 2 is a schematic diagram of power supply of light emitting diodes in a display screen in an embodiment
  • FIG. 3 is a curve diagram of the turning voltage corresponding to the current of the constant current driving module in an embodiment
  • Figure 4 is a circuit schematic diagram of the regulated power supply module in an embodiment
  • Fig. 5 is a schematic circuit diagram of the stabilized power supply module in another embodiment
  • Fig. 6 is a structural block diagram of the power supply feedback adjustment system in another embodiment.
  • a power supply feedback regulation system which includes a processing module, a current detection module, a constant current drive module, and a stabilized power supply module.
  • the input end of the regulated power supply module is used to connect to a power source.
  • the output terminal of the regulated power supply module is connected with the input terminal of the constant current drive module.
  • the output terminal of the constant current drive module is used to connect with the light emitting diode.
  • the output terminal of the constant current drive module is connected to the input terminal of the current detection module.
  • the output terminal of the current detection module is connected to the detection input terminal of the processing module.
  • the control output end of the processing module is connected to the regulating end of the regulated power supply module.
  • the processing module is configured to detect the current output by the constant current drive module through the current detection module, and obtain the corresponding function formula according to the current output by the constant current drive module and the voltage and current of the constant current drive module The turning voltage of the constant current drive module.
  • the processing module is configured to obtain the operating voltage of the light emitting diode according to the current output by the constant current driving module and the corresponding function formula of the voltage and current of the light emitting diode.
  • the processing module is configured to calculate the power supply voltage according to the turning voltage and the operating voltage of the light emitting diode, and control the regulated power supply module to output the power supply voltage.
  • the above-mentioned power supply feedback adjustment system supplies power to the constant current drive module through the stabilized power supply module, so that the constant current drive module outputs current.
  • the processing module obtains the turning voltage of the constant current driving module and the operating voltage of the light emitting diode according to the current output by the constant current driving module.
  • the processing module obtains the minimum power supply voltage of the light emitting diode according to the transition voltage and the operating voltage of the light emitting diode, thereby realizing the measurement of the minimum power supply voltage of the light emitting diode, and controls the stabilized power supply module Output power supply voltage to realize feedback regulation function.
  • a power supply feedback adjustment system 10 which includes a processing module 300, a current detection module 400, a constant current drive module 200 and a stabilized power supply module 100.
  • the input end of the regulated power supply module 100 is used to connect to a power source.
  • the output terminal of the regulated power supply module 100 is connected to the input terminal of the constant current drive module 200.
  • the output terminal of the constant current driving module 200 is used to connect with the light emitting diode.
  • the output terminal of the constant current drive module 200 is connected to the input terminal of the current detection module 400.
  • the output terminal of the current detection module 400 is connected to the detection input terminal of the processing module 300.
  • the control output end of the processing module 300 is connected to the regulating end of the regulated power supply module 100.
  • the processing module 300 is configured to detect the current output by the constant current driving module 200 through the current detection module 400.
  • the processing module 300 may obtain the turning voltage of the constant current driving module 200 according to the current output by the constant current driving module 200 and the corresponding function formula of the voltage and the current of the constant current driving module 200.
  • the processing module 300 may obtain the operating voltage of the light emitting diode according to the current output by the constant current driving module 200 and the corresponding function formula of the voltage and current of the light emitting diode.
  • the processing module 300 may calculate the power supply voltage according to the transition voltage and the operating voltage of the light emitting diode, and control the regulated power supply module 100 to output the power supply voltage.
  • the power supply voltage is the output voltage of the regulated power supply module 100.
  • the regulated power supply module 100 needs to supply power to the constant current drive module 200 and the light emitting diodes. Without considering the voltage loss V Drop , the output voltage V LED of the regulated power supply module 100 includes the operating voltage V F of the light emitting diode and the operating voltage V DS of the constant current driving module 200.
  • the operating voltage V F of the light-emitting diode refers to the voltage required by the light-emitting diode during operation. That is, the voltage required for the light-emitting diode to work at a certain current. It should be noted that the light-emitting diodes of different materials or different colors require different voltage values when operating at a certain current.
  • the relationship between the voltage and current of the light-emitting diodes of different models can be measured by corresponding equipment, so as to obtain the corresponding function formulas of the voltage and current of the light-emitting diodes of the different models.
  • the corresponding function formulas of the voltage and current of the light-emitting diodes of different models can be imported into the processing module 300.
  • the processing module 300 may obtain the operating voltage V F of the light emitting diode according to the output current I out of the constant current driving module 200 and the corresponding function formula of the voltage and current of the light emitting diode.
  • the corresponding function formula of the voltage and current of the light-emitting diode may be pre-stored in the storage module.
  • the storage module is connected to the processing module 300.
  • the processing module 300 can read the corresponding function formula of the voltage and current of the light emitting diode from the storage module.
  • the storage module may store the corresponding function formulas of voltage and current of multiple light-emitting diodes.
  • the storage module may include a register.
  • the storage module may also include FLASH (flash memory). It can be understood that the output terminal of the constant current driving module 200 is connected in series with the light emitting diode.
  • the output current I out of the constant current driving module 200 is the current flowing through the light emitting diode. Therefore, the voltage corresponding to the output current I out of the constant current driving module 200 can be obtained according to the corresponding function formula of the voltage and current of the light emitting diode, that is, the operating voltage V F of the light emitting diode.
  • the working voltage V DS of the constant current driving module 200 and its corresponding output current I out are proportional. As shown in FIG. 3, the output current I out of the constant current driving module 200 is different, and the required operating voltage V DS is also different. The working voltage V DS of the constant current driving module gradually increases from 0, and the output current I out of the constant current driving module also gradually increases. When the operating voltage V DS of the constant current driving module increases to a certain value, the output current I out of the constant current driving module 200 no longer increases, but becomes a fixed value. Points A, B, C, and D in FIG. 3 are the inflection points, that is, the output current I out of the constant current drive module 200 no longer increases with the increase in the operating voltage V DS of the constant current drive module 200 Point.
  • the voltage value of the working voltage V DS of the constant current driving module 200 corresponding to the inflection point is the turning voltage of the constant current driving module 200.
  • the corresponding function formula of the voltage and current of the constant current driving module 200 is the relationship between each output current of the constant current driving module 200 and the turning voltage corresponding to each output current.
  • the relationship between each output current and the transition voltage corresponding to each output current is different.
  • Each of the output currents in the constant current drive module 200 and the transition voltage relationship corresponding to each of the output currents can be determined by the specifications of the constant current drive module 200. Therefore, the corresponding function formula of the voltage and current of the constant current driving module 200 can be determined by the specifications of the constant current driving module 200.
  • the corresponding function formula of the voltage and current of the constant current driving module 200 can be imported into the processing module.
  • the processing module 300 can obtain the turning voltage of the constant current driving module 200 according to the output current of the constant current driving module 200.
  • the corresponding function formula of the voltage and current of the constant current driving module 200 may be pre-stored in the storage module.
  • the processing module 300 may read the corresponding function formula of the voltage and current of the constant current driving module 200 from the storage module.
  • the storage module may store a plurality of corresponding function formulas of voltage and current of the constant current driving module 200.
  • the corresponding function formula of the voltage and current of each constant current driving module 200 can correspond to a curve in FIG. 3. It can be understood that the corresponding function formula of the voltage and current of the constant current drive module 200 can also be discrete values, and when there are enough discrete values, the discrete values are connected to the curve in FIG. 3.
  • the luminous intensity of the light-emitting diode is proportional to the current input to the light-emitting diode.
  • the current input to the light emitting diode is the output current I out of the constant current driving module 200. It can be understood that, in order to make the constant current driving module 200 output the maximum current, a relatively large voltage (exceeding the turning voltage) may be input to the constant current driving module 200, so that the output current of the constant current driving module 200 I out reaches the maximum, so that the light-emitting diode works according to the required maximum luminous intensity.
  • the transition voltage corresponding to the operating current of the light emitting diode can be obtained, and the constant current driving module 200 can be powered at the transition voltage to achieve the maximum current provided to the light emitting diode. Since the transition voltage is the minimum working voltage at which the output current of the constant current drive module 200 reaches the working current of the light emitting diode, it can ensure that the light emitting diode works according to the required luminous intensity while reducing the constant current Power consumption of the drive module 200. Therefore, the operating voltage V LED output by the stabilized power supply module 100 is the smallest, so that the light-emitting diode can emit light according to the maximum luminous intensity with minimal power loss.
  • the light-emitting diode can be the light-emitting diode under test.
  • the light-emitting diode to be tested may be a light-emitting lamp bead on the LED display screen.
  • the operation of a plurality of the light-emitting diodes can make the LED display screen realize light-emitting display.
  • the above-mentioned power supply feedback adjustment system 10 supplies power to the constant current drive module 200 through the stabilized power supply module 100 so that the constant current drive module 200 can output current.
  • the processing module 300 obtains the turning voltage of the constant current driving module 200 and the operating voltage of the light emitting diode according to the output current of the constant current driving module 200.
  • the processing module 300 obtains the minimum power supply voltage of the light emitting diode according to the transition voltage and the operating voltage of the light emitting diode.
  • the power supply feedback regulation system 10 can realize the measurement of the minimum power supply voltage of the light emitting diodes, by controlling the regulated power supply module to output the minimum power supply voltage to realize feedback regulation and save power.
  • the processing module 300 may control the regulated power supply module 100 to output a first voltage greater than a preset threshold voltage, so that the constant current driving module 200 outputs a maximum current. It should be understood that when measuring the operating voltage of the diode, the luminous intensity of the light-emitting diode needs to be determined first. The luminous intensity of the light-emitting diode is proportional to the input current of the light-emitting diode. When the luminous intensity of the light-emitting diode is determined, the input current of the light-emitting diode can be determined.
  • the input current of the light emitting diode is the maximum output current output by the constant current driving module 200. That is to say, by changing the working voltage of the constant current driving module 200, the constant current driving module 200 can output the maximum current.
  • the preset threshold voltage is 3.8V ⁇ 5.5V. In one embodiment, the preset threshold voltage is 5V.
  • the transition voltage of the constant current driving module 200 is the minimum value of the operating voltage of the constant current driving module 200 when the output current of the constant current driving module 200 is the maximum.
  • the processing module 300 may also obtain the voltage from a plurality of constant current driving modules according to the maximum current output by the constant current driving module 200
  • a corresponding function formula of the voltage and current of the constant current drive module 200 corresponding to the maximum current is determined, and the constant current drive corresponding to the maximum current and the maximum current is determined.
  • the corresponding function formula of the voltage and current of the module 200 obtains the turning voltage of the constant current driving module 200.
  • a corresponding function formula of the voltage and current of the constant current driving module 200 corresponding to the maximum current can be determined, so as to obtain the constant current driving module 200 by calculation. Switching voltage.
  • the processing module 300 may detect the maximum current output by the constant current driving module 200 through the current detection module 400.
  • the processing module 300 may determine a constant current corresponding to the maximum current from a plurality of corresponding function formulas of the voltage and current of the constant current driving module 200 according to the maximum current output by the constant current driving module 200 The corresponding function formula of the voltage and current of the driving module 200.
  • the processing module 300 may obtain the turning voltage of the constant current driving module 200 according to the maximum current output by the constant current driving module 200 and the corresponding function formula of the voltage and current of the constant current driving module 200.
  • the processing module 300 may obtain the operating voltage of the light emitting diode according to the maximum current output by the constant current driving module 200 and the corresponding function formula of the voltage and current of the light emitting diode.
  • the processing module 300 may also add the turning voltage, the operating voltage of the light-emitting diode, and a preset voltage to calculate the power supply voltage.
  • the processing module 300 may also control the regulated power supply module 100 to output the power supply voltage.
  • the processing module 300 may calculate the power supply voltage according to the transition voltage and the operating voltage of the light emitting diode, and control the regulated power supply module 100 to output the power supply voltage.
  • the processing module 300 may add the turning voltage, the operating voltage, and the preset voltage to calculate the power supply voltage, and control the regulated power supply module to output the power supply voltage.
  • the power supply voltage V LED of the light-emitting diode may include voltage loss V Drop in addition to the working voltage V F of the light-emitting diode and the working voltage V DS of the constant current driving module. Therefore, on the basis of the operating voltage V F of the light emitting diode and the operating voltage V DS of the constant current driving module 200, a preset voltage can be appropriately increased to obtain the supply voltage. In other words, add a little safety margin to obtain the power supply voltage.
  • the power supply voltage output by the stabilized power supply module is relatively small, which ensures that the light emitting diode can work normally.
  • the preset voltage is 0.2V-0.8V. In one embodiment, the preset voltage is 0.4V.
  • the processing module 300 may control the regulated power supply module 100 to output the second voltage and the third voltage respectively.
  • the third voltage is greater than the second voltage, so that the constant current driving module 200 outputs the second current and the third current.
  • the processing module may detect whether the second current is equal to the third current.
  • the processing module may obtain the constant current driving module according to the third current and the corresponding function formula of the voltage and current of the constant current driving module 200 Turning voltage of 200.
  • the processing module may obtain the operating voltage of the light emitting diode according to the third current and the corresponding function formula of the voltage and current of the light emitting diode. In this way, when the second current is equal to the third current, it means that the constant current driving module 200 outputs the maximum current, that is, it is ensured that the constant current driving module 200 outputs the maximum current.
  • the processing module 300 can control the output voltage of the regulated power supply module 100 to increase.
  • the processing module 300 detects that the output current of the constant current drive module 200 has not changed, the processing module 300 can detect the output current of the constant current drive module through the current detection module 400, and then perform The output current of the constant current driving module 200 and the corresponding function formula of the voltage and current of the constant current driving module 200 are used to obtain the turning voltage of the constant current driving module 200.
  • the processing module 300 may obtain the operating voltage of the light emitting diode according to the output current of the constant current driving module 200 and the corresponding function formula of the voltage and current of the light emitting diode.
  • the processing module 300 controls the output voltage of the regulated power supply module 100 to gradually increase.
  • the processing module 300 can detect the current output by the constant current driving module 200 in real time. When the processing module 300 detects that the output current of the constant current drive module 200 does not change with the increase of the output voltage of the stabilized power supply module 100, the output current of the constant current drive module 200 is at this time.
  • the maximum current output by the constant current drive module 200 is described.
  • the processing module 200 can obtain the turning voltage of the constant current driving module 200 according to the maximum current and the corresponding function formula of the voltage and current of the constant current driving module 200.
  • the processing module 200 can obtain the operating voltage of the light emitting diode according to the maximum current and the corresponding function formula of the voltage and current of the light emitting diode.
  • the processing module 300 may sum the transition voltage and the operating voltage of the light emitting diode to obtain the power supply voltage, and control the regulated power supply module 100 to output the power supply voltage.
  • the regulated power supply module 100 includes a resistor R1, a digital potentiometer U2, and a regulated power supply chip U1.
  • the input terminal of the regulated power supply chip U1 can be connected to a power source.
  • the output terminal of the regulated power supply chip U1 may be connected to the input terminal of the constant current drive module 200.
  • the output terminal of the regulated power supply chip U1 may also be connected to the first resistance output terminal of the digital potentiometer U2.
  • the second resistance output terminal of the digital potentiometer U2 is connected to the feedback terminal of the stabilized power supply chip U1.
  • the feedback end of the stabilized power supply chip U1 may also be grounded through the resistor R1.
  • the adjustment terminal of the digital potentiometer U2 is connected to the control output terminal of the processing module 300.
  • the digital potentiometer U2 has the characteristics of high efficiency, fast response, high precision and convenient control, and the output can be adjusted through an external circuit.
  • the relationship between the voltage output by the regulated power supply chip U1 and the resistance value of the digital potentiometer is:
  • V out 0.8(1+RD1/R1)*V in (1)
  • V in is the input voltage of the regulated power supply chip U1
  • V out is the output voltage of the regulated power supply chip
  • RD1 is the resistance value output by the digital potentiometer U2.
  • the regulated power supply module 100 can be controlled to output the supply voltage.
  • the latch signal output terminal of the processing module 300 may be connected to the latch terminal of the digital potentiometer U2.
  • the processing module 300 may control the stabilized power supply chip U1 to send a latch signal to the latch terminal of the digital potentiometer U2 when the power supply chip U1 outputs the power supply voltage, so that the resistance value of the digital potentiometer U2 remains unchanged .
  • the enable terminal of the digital potentiometer U2 can be connected to the enable control terminal of the processing module 300. When the enable terminal and the latch terminal of the digital potentiometer U2 receive a high-level signal, the digital potentiometer U2 will latch the output resistance value so that the output of the digital potentiometer U2 will be The resistance value does not change.
  • the model of the digital potentiometer U2 is X9C109.
  • the latch terminal of the digital potentiometer U2 is the INC pin of the digital potentiometer U2.
  • the adjustment terminal of the digital potentiometer U2 is the U/D pin of the digital potentiometer U2.
  • the first resistance output terminal of the digital potentiometer U2 is the RW pin of the digital potentiometer U2.
  • the second resistance output terminal of the digital potentiometer U2 is the RL pin of the digital potentiometer U2.
  • the enable terminal of the digital potentiometer U2 is the CS pin of the digital potentiometer U2.
  • the model of the stabilized power supply chip U1 is TLV62130.
  • the model of the constant current drive module 200 is MBI5153.
  • the stabilized power supply module 100 includes a resistor R1, a digital potentiometer U2, and a stabilized power supply chip U1.
  • the input terminal of the regulated power supply chip U1 can be connected to a power source.
  • the output terminal of the regulated power supply chip U1 may be connected to the input terminal of the constant current drive module U2.
  • the output terminal of the stabilized power supply chip U1 may be connected to the first terminal of the resistor R1.
  • the second end of the resistor R1 can be connected to the feedback end of the stabilized power supply chip U1.
  • the second end of the resistor R1 can also be connected to the first resistance output end of the digital potentiometer U2.
  • the second resistance output terminal of the digital potentiometer U2 can be grounded.
  • the adjustment terminal of the digital potentiometer U2 is connected to the control output terminal of the processing module 300.
  • the relationship between the output voltage of the regulated power supply chip U1 and the resistance value of the digital potentiometer U2 is:
  • V out 0.8(1+R1/RD1)*V in (2)
  • V in is the input voltage of the regulated power supply chip U1
  • V out is the output voltage of the regulated power supply chip U1
  • RD1 is the resistance value output by the digital potentiometer.
  • the regulated power supply module 100 can be controlled to output the supply voltage.
  • the current detection module 400 includes a current sensor 410 and an analog-to-digital converter 420.
  • the input terminal of the current sensor 410 is connected to the output terminal of the constant current driving module 200.
  • the output terminal of the current sensor 410 is connected to the input terminal of the analog-to-digital converter 420.
  • the output terminal of the analog-to-digital converter 420 is connected to the input terminal of the processing module 300.
  • the current sensor 410 can measure current like an ammeter.
  • the advantage of the current sensor 410 is that the response is very fast, and the instantaneous current change can be captured, so that the output current of the constant current drive module 200 can be measured in real time.
  • the current sensor 410 may transmit the measured output current of the constant current driving module 200 to the analog-to-digital converter 420.
  • the analog-to-digital converter 420 converts the output current into a specific value, so that the processing module 300 can obtain the turning voltage of the constant current drive module 200 and the light emission according to the output current of the constant current drive module 200.
  • the operating voltage of the diode may be used to obtain the turning voltage of the constant current drive module 200 and the light emission according to the output current of the constant current drive module 200.
  • the current sensor 410 may be a Hall current sensor.
  • the Hall current sensor has the characteristics of high accuracy and good linearity, so that the output current of the constant current driving module 200 can be accurately measured.
  • An embodiment of the present application also provides an LED display screen, which includes a plurality of the light-emitting diodes, and the power supply feedback adjustment system 10 described in any of the foregoing embodiments.
  • the above-mentioned display screen can supply power to the constant current drive module 200 through the stabilized power supply module 100, so that the constant current drive module 200 outputs current.
  • the processing module 300 can obtain the turning voltage of the constant current driving module 200 and the operating voltage of the light emitting diode according to the output current of the constant current driving module 200.
  • the processing module 300 can obtain the minimum power supply voltage of the light emitting diode according to the transition voltage and the operating voltage of the light emitting diode.
  • the above-mentioned display screen can realize the measurement of the minimum power supply voltage of the light-emitting diode, and output the power supply voltage through the control stabilized power supply module to realize the function of feedback adjustment. Therefore, the display screen can have lower power consumption.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

La présente invention porte sur un système de réglage de rétroaction d'alimentation électrique (10) et sur un écran de visualisation. Le système (10) comprend un module de traitement (300), un module de détection de courant (400), un module d'entraînement à courant constant (200) et un module d'alimentation électrique de stabilisation de tension (100), le module d'alimentation électrique de stabilisation de tension (100) fournissant de l'énergie au module d'entraînement à courant constant (200) de telle sorte que le module d'entraînement à courant constant (200) délivre en sortie un courant ; et le module de traitement (300) acquérant, au moyen du module de détection de courant (400), la sortie de courant par le module d'entraînement à courant constant (200), obtenant, en fonction de la sortie de courant par le module d'entraînement à courant constant (200), une tension de rupture du module d'entraînement à courant constant (200) et une tension de travail d'une diode électroluminescente et obtenant, en fonction de la tension de rupture et de la tension de travail de la diode électroluminescente, la tension d'alimentation minimale de la diode électroluminescente, ce qui permet de réaliser une mesure de la tension d'alimentation minimale de la diode électroluminescente et de réaliser la fonction de réglage de rétroaction au moyen de la commande du module d'alimentation électrique de stabilisation de tension (100) pour délivrer en sortie la tension d'alimentation électrique.
PCT/CN2020/100016 2019-07-17 2020-07-03 Système de réglage de rétroaction d'alimentation électrique et écran de visualisation WO2021008384A1 (fr)

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