CN110262615B - Power supply feedback adjusting system and display screen - Google Patents
Power supply feedback adjusting system and display screen Download PDFInfo
- Publication number
- CN110262615B CN110262615B CN201910644846.1A CN201910644846A CN110262615B CN 110262615 B CN110262615 B CN 110262615B CN 201910644846 A CN201910644846 A CN 201910644846A CN 110262615 B CN110262615 B CN 110262615B
- Authority
- CN
- China
- Prior art keywords
- voltage
- power supply
- module
- constant current
- driving module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- 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
The invention provides a power supply feedback regulation system and a display screen, wherein the system comprises a processing module, a current detection module, a constant current driving module and a voltage-stabilizing power supply module; the voltage-stabilizing power supply module supplies power to the constant current driving module, so that the constant current driving module outputs current, the processing module acquires the current output by the constant current driving module through the current detection module, acquires the breakover voltage of the constant current driving module and the working voltage of the light-emitting diode according to the current output by the constant current driving module, acquires the minimum power supply voltage of the light-emitting diode according to the breakover voltage and the working voltage of the light-emitting diode, the minimum power supply voltage of the light-emitting diode is measured, and the function of feedback regulation is realized by controlling the voltage-stabilizing power supply module to output the power supply voltage.
Description
Technical Field
The invention relates to the technical field of power detection, in particular to a power supply feedback adjusting system and a display screen.
Background
As a new display technology, the LED display screen (Light Emitting Diode) is more and more favored by users with its advantages of energy saving, environmental protection, high brightness, etc., the LED display screen usually comprises a plurality of pixels arranged in a matrix, each pixel generally comprises a green LED, a blue LED and a red LED, but the minimum power supply voltage of the LEDs of different colors is different due to the difference of the manufacturing materials, i.e. the minimum voltage value required for the LEDs to Light is different, the minimum power supply voltage of the LEDs of the same color is different due to the different specifications, for example, the power supply voltage required by the red LED is usually smaller than that required by the green LED or the blue LED, and in addition, the Light Emitting intensity of the same LED is in a direct proportion relation with the required current value, when the current input by the light emitting diode is different, the minimum required power supply voltage of the light emitting diode is different. Therefore, the LED of the display screen can be powered by adopting a shunt power supply mode only by measuring the minimum power supply voltage of the LED, so that the electric energy loss of the display screen is reduced, but the current measurement mode of the LED generally adopts a gradual adjustment test, namely the power supply voltage of the LED is slowly increased or reduced, and whether the luminous intensity of a lamp bead is changed or not is observed, so that the minimum power supply voltage of the LED is confirmed.
Disclosure of Invention
Therefore, the invention is needed to measure the minimum power supply voltage of the light-emitting diode, and the power supply feedback adjusting system and the display screen are provided, wherein the problems of low test efficiency and large error are solved.
The power supply feedback regulation system comprises a processing module, a current detection module, a constant current driving module and a voltage stabilization power supply module; the input end of the voltage-stabilizing power supply module is used for being connected with a power supply, the output end of the voltage-stabilizing power supply module is connected with the input end of the constant current driving module, the output end of the constant current driving module is used for being connected with a light-emitting diode, the output end of the constant current driving module is connected with the input end of the current detection module, the output end of the current detection module is connected with the detection input end of the processing module, and the control output end of the processing module is connected with the adjusting end of the voltage-stabilizing power supply module; the processing module is used for detecting the current output by the constant current driving module through the current detection module, obtaining the breakover voltage of the constant current driving module according to the current output by the constant current driving module and the corresponding function formula of the voltage and the current of the constant current driving module, obtaining the working 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 the current of the light emitting diode, calculating to obtain the power supply voltage according to the breakover voltage and the working voltage of the light emitting diode, and controlling the voltage stabilizing power supply module to output the power supply voltage.
In one embodiment, the processing module is configured to control the voltage stabilization power supply module to output a first voltage greater than a preset threshold voltage, so that the constant current driving module outputs a maximum current.
In one embodiment, the processing module is configured to detect a maximum current output by the constant current driving module through the current detection module, obtain a breakover voltage of the constant current driving module according to the maximum current output by the constant current driving module and a corresponding functional expression of a voltage and a current of the constant current driving module, and obtain a working voltage of the light emitting diode according to the maximum current output by the constant current driving module and the corresponding functional expression of the voltage and the current of the light emitting diode.
In one embodiment, the breakover voltage of the constant current driving module is a minimum voltage corresponding to a maximum current output by the constant current driving module.
In one embodiment, the processing module is further configured to add the breakover voltage, the working voltage, and a preset voltage, calculate to obtain the supply voltage, and control the regulated power supply module to output the supply voltage.
In one embodiment, the voltage-stabilizing power supply module includes a resistor R1, a digital potentiometer and a voltage-stabilizing power supply chip, an input end of the voltage-stabilizing power supply chip is used for connecting a power supply, an output end of the voltage-stabilizing power supply chip is connected with an input end of the constant current driving module, an output end of the voltage-stabilizing power supply chip is further connected with a first resistance value output end of the digital potentiometer, a second resistance value output end of the digital potentiometer is connected with a feedback end of the voltage-stabilizing power supply chip, a feedback end of the voltage-stabilizing power supply chip is further used for being grounded through the resistor R1, and an adjustment end of the digital potentiometer is connected with a control output end of the processing module.
In one embodiment, the voltage-stabilizing power supply module includes a resistor R1, a digital potentiometer and a voltage-stabilizing power supply chip, an input end of the voltage-stabilizing power supply chip is used for connecting a power supply, an output end of the voltage-stabilizing power supply chip is connected with an input end of the constant current driving module, an output end of the voltage-stabilizing power supply chip is connected with a first end of the resistor R1, a second end of the resistor R1 is connected with a feedback end of the voltage-stabilizing power supply chip, a second end of the resistor R1 is further connected with a first resistance value output end of the digital potentiometer, a second resistance value output end of the digital potentiometer is used for grounding, and an adjusting end of the digital potentiometer is connected with a control output end of the processing module.
In one embodiment, the current detection module includes a current sensor and an analog-to-digital converter, an input end of the current sensor is connected with an output end of the constant current driving module, an output end of the current sensor is connected with an input end of the analog-to-digital converter, and an output end of the analog-to-digital converter is connected with an input end of the processing module.
In one embodiment, the current sensor is a hall current sensor.
In one embodiment, an LED display screen is provided, which includes the power supply feedback adjustment system described in any of the above embodiments.
According to the power supply feedback regulation system, the constant current driving module is supplied with power through the voltage-stabilizing power supply module, so that the constant current driving module outputs current, the processing module obtains the turning voltage of the constant current driving module and the working voltage of the light-emitting diode according to the current output by the constant current driving module, obtains the minimum power supply voltage of the light-emitting diode according to the turning voltage and the working voltage of the light-emitting diode, realizes the measurement of the minimum power supply voltage of the light-emitting diode, and realizes the function of feedback regulation by controlling the voltage-stabilizing power supply module to output the power supply voltage.
Drawings
FIG. 1 is a block diagram of the power supply feedback regulation system in one embodiment;
FIG. 2 is a schematic diagram of the power supply of the LEDs in the display panel according to one embodiment;
FIG. 3 is a graph of a breakover voltage corresponding to a current of the constant current driving module in one embodiment;
FIG. 4 is a schematic circuit diagram of the regulated power supply module in one embodiment;
FIG. 5 is a schematic circuit diagram of the regulated power supply module in another embodiment;
fig. 6 is a block diagram of a power supply feedback regulation system according to another embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
For example, a power supply feedback regulation system is provided, which includes a processing module, a current detection module, a constant current driving module and a voltage stabilization power supply module; the input end of the voltage-stabilizing power supply module is used for being connected with a power supply, the output end of the voltage-stabilizing power supply module is connected with the input end of the constant current driving module, the output end of the constant current driving module is used for being connected with a light-emitting diode, the output end of the constant current driving module is connected with the input end of the current detection module, the output end of the current detection module is connected with the detection input end of the processing module, and the control output end of the processing module is connected with the adjusting end of the voltage-stabilizing power supply module; the processing module is used for detecting the current output by the constant current driving module through the current detection module, obtaining the breakover voltage of the constant current driving module according to the current output by the constant current driving module and the corresponding function formula of the voltage and the current of the constant current driving module, obtaining the working 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 the current of the light emitting diode, calculating to obtain the power supply voltage according to the breakover voltage and the working voltage of the light emitting diode, and controlling the voltage stabilizing power supply module to output the power supply voltage.
According to the power supply feedback regulation system, the constant current driving module is supplied with power through the voltage-stabilizing power supply module, so that the constant current driving module outputs current, the processing module obtains the turning voltage of the constant current driving module and the working voltage of the light-emitting diode according to the current output by the constant current driving module, obtains the minimum power supply voltage of the light-emitting diode according to the turning voltage and the working voltage of the light-emitting diode, realizes the measurement of the minimum power supply voltage of the light-emitting diode, and realizes the function of feedback regulation by controlling the voltage-stabilizing power supply module to output the power supply voltage.
In one embodiment, please refer to fig. 1, which provides a power supply feedback adjusting system 10, including a processing module 300, a current detecting module 400, a constant current driving module 200, and a voltage stabilizing power supply module 100; the input end of the voltage-stabilizing power supply module 100 is used for connecting a power supply, the output end of the voltage-stabilizing power supply module 100 is connected with the input end of the constant current driving module 200, the output end of the constant current driving module 200 is used for connecting a light emitting diode, the output end of the constant current driving module 200 is connected with the input end of the current detection module 400, the output end of the current detection module 400 is connected with the detection input end of the processing module 300, and the control output end of the processing module 300 is connected with the adjustment end of the voltage-stabilizing 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, obtain a breakover voltage of the constant current driving module 200 according to the current output by the constant current driving module 200 and a corresponding functional expression of the voltage and the current of the constant current driving module 200, obtain a working voltage of the light emitting diode according to the current output by the constant current driving module 200 and a corresponding functional expression of the voltage and the current of the light emitting diode, calculate a supply voltage according to the breakover voltage and the working voltage of the light emitting diode, and control the regulated power supply module 100 to output the supply voltage.
Specifically, in the LED power supply system, as shown in fig. 2, the voltage-stabilizing power supply module needs to supply power to the constant current driving module and the light emitting diode, that is, the voltage V output by the voltage-stabilizing power supply module is providedLEDOperating voltage V comprising light-emitting diodesFAnd working voltage V of constant current driving moduleDS。
Wherein the operating voltage V of the light-emitting diodeFIt is to be noted that the voltage required by the light emitting diode when operating, that is, the voltage required by the light emitting diode when operating at the current, is different when the light emitting diodes of different materials and colors operate at a certain current, but the relationship between the voltage and the current of the light emitting diodes of different modelsThe method can be used for measuring through corresponding equipment, so that a corresponding function formula of the voltage and the current of the light-emitting diode is obtained, the corresponding function formula of the voltage and the current of the light-emitting diode is led into a processing module, and the processing module can obtain the working voltage V 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 the current of the light-emitting diodeFIn one embodiment, the processing module is configured to read the corresponding function of the voltage and the current of the light emitting diode from the storage module, in one embodiment, the storage module is configured to store the corresponding function of the voltage and the current of the light emitting diode, and in one embodiment, the storage module is configured to store the corresponding function of the voltage and the current of the plurality of light emitting diodes. In one embodiment, the memory module includes a register. In one embodiment, the storage module comprises FLASH (FLASH memory). It can be understood that the output end of the constant current driving module is connected in series with the light emitting diode, and the current output by the constant current driving module is the current flowing through the light emitting diode, so that the voltage corresponding to the current, that is, the working voltage V of the light emitting diode, can be obtained according to the corresponding functional expression of the voltage and the current of the light emitting diodeF。
Working voltage V of constant current driving moduleDSThe output current of the constant current driving module is in a certain proportional relation with the corresponding output current, as shown in fig. 3, the different output currents of the constant current driving module are different from the required driving voltage, and when the driving voltage exceeds a certain value, the output current does not change with the increase of the driving voltage, as shown in fig. 3, A, B, C and D point are inflection points, namely turning points of the constant current driving module, and the corresponding voltage value is the turning voltage of the constant current driving module. It should be noted that the corresponding function expression of the voltage and the current of the constant current driving module, i.e. the relationship between each current of the constant current driving module and the corresponding transition voltage of each current, is different from the relationship between each current and the corresponding transition voltage of each current in different types of constant current driving modules, and the relationship between each current and the corresponding transition voltage in the constant current driving module can be determined byThe specification of the constant current driving module is determined, only the relation between the voltage and the current of the constant current driving module needs to be led into the processing module, the processing module can obtain the breakover voltage of the constant current driving module according to the output current of the constant current driving module, in one embodiment, the corresponding function formula between the voltage and the current of the constant current driving module is prestored in the storage module, namely the storage module is used for storing the corresponding function formula between the voltage and the current of the constant current driving module, the processing module is used for reading the corresponding function formula between the voltage and the current of the constant current driving module from the storage module, in one embodiment, the storage module is used for storing the corresponding function formula between the voltage and the current of a plurality of constant current driving modules, the corresponding function formula between the voltage and the current of each constant current driving module can correspond to a curve in fig. 3, it should be understood that the corresponding function formula between the voltage and the current of the constant current driving module can also be a discrete numerical value, when the number of discrete values is large enough, the connection of the discrete values is the curve in fig. 3. It can be understood that, in order to enable the constant current driving module to output the maximum current, a larger voltage is usually input to the constant current driving module so as to enable the light emitting diode to work at the required light emitting intensity, and thus, by obtaining the turning voltage corresponding to the current and enabling the constant current driving module to supply power at the turning voltage, the power consumption of the constant current driving module can be reduced while the light emitting diode works at the required light emitting intensity.
In this embodiment, the light emitting diode is a light emitting diode to be tested. The LED is a luminous lamp bead on the LED display screen, and the plurality of LEDs work to enable the LED display screen to emit light for display.
According to the power supply feedback regulation system, the constant current driving module is supplied with power through the voltage-stabilizing power supply module, so that the constant current driving module outputs current, the processing module obtains the turning voltage of the constant current driving module and the working voltage of the light-emitting diode according to the current output by the constant current driving module, obtains the minimum power supply voltage of the light-emitting diode according to the turning voltage and the working voltage of the light-emitting diode, realizes the measurement of the minimum power supply voltage of the light-emitting diode, and realizes the function of feedback regulation by controlling the voltage-stabilizing power supply module to output the power supply voltage.
In order to enable the constant current driving module to output a maximum current. In one embodiment, the processing module is configured to control the voltage stabilization power supply module to output a first voltage greater than a preset threshold voltage, so that the constant current driving module outputs a maximum current. It should be understood that, when the operating voltage is measured, the light emitting intensity of the light emitting diode needs to be determined first, and since the light emitting intensity of the light emitting diode is in a proportional relationship with the current, in the case that the light emitting intensity of the light emitting diode is determined, the current required to be output by the constant current driving module, that is, the maximum current that can be output by the constant current driving module is determined by only changing the input voltage of the constant current driving module, so that the constant voltage power supply module outputs the first voltage greater than the preset threshold value, that is, even if the constant voltage power supply module outputs the breakover voltage greater than the constant current driving module, the constant current driving module outputs the. In one embodiment, the preset threshold voltage is 3.8V to 5.5V, and in one embodiment, the preset threshold voltage is 5V. By making the voltage output by the voltage stabilization power supply module be more than 3.8V, preferably, by making the voltage stabilization power supply module output 5V voltage, the constant current driving module can be ensured to output the maximum current.
In order to enable the processing module to be used for detecting the maximum current output by the constant current driving module through the current detection module, the turning voltage of the constant current driving module is obtained according to the maximum current output by the constant current driving module and a corresponding function formula of the voltage and the current of the constant current driving module, and the working voltage of the light emitting diode is obtained according to the maximum current output by the constant current driving module and the corresponding function formula of the voltage and the current of the light emitting diode. In one embodiment, the breakover voltage of the constant current driving module is a minimum voltage corresponding to a maximum current output by the constant current driving module.
In order to obtain the breakover voltage of the constant current driving module better, in one embodiment, the processing module is further configured to determine a corresponding function expression of the voltage and the current of the constant current driving module corresponding to the maximum current from corresponding function expressions of the voltage and the current of a plurality of constant current driving modules according to the maximum current output by the constant current driving module, and obtain the breakover voltage of the constant current driving module according to the maximum current output by the constant current driving module and the corresponding function expression of the voltage and the current of the constant current driving module. Therefore, according to the maximum voltage output by the constant current driving module, a function formula corresponding to the voltage and the current of the constant current driving module corresponding to the maximum current can be determined, and the breakover voltage of the constant current driving module can be obtained through better calculation.
In one embodiment, the processing module is configured to detect a maximum current output by the constant current driving module through the current detection module, determine a corresponding function expression of the voltage and the current of the constant current driving module corresponding to the maximum current from corresponding function expressions of the voltage and the current of a plurality of constant current driving modules according to the maximum current output by the constant current driving module, obtain a breakover voltage of the constant current driving module according to the maximum current output by the constant current driving module and the corresponding function expression of the voltage and the current of the constant current driving module, and obtain the operating voltage of the light emitting diode according to the maximum current output by the constant current driving module and the corresponding function expression of the voltage and the current of the light emitting diode. I.e. better to obtain the operating voltage of the light emitting diode.
In order to enable the light emitting diode to work normally, the processing module is further configured to add the turning voltage, the working voltage and a preset voltage, calculate to obtain the supply voltage, and control the voltage stabilization power supply module to output the supply voltage. Specifically, the processing module is configured to calculate and obtain a supply voltage according to the breakover voltage and the working voltage of the light emitting diode, and control the voltage stabilizing power supply module to output the supply voltage, and the method includes: the processing module is used for adding the turning voltage, the working voltage and a preset voltage, calculating to obtain the power supply voltage, and controlling the voltage stabilization power supply module to output the power supply voltage. As shown in fig. 1, the supply voltage V of the ledLEDExcept for the light emitting diodeOperating voltage V ofFAnd working voltage V of constant current driving moduleDSIn addition, voltage loss V is includedDropThus according to the working voltage V of the light emitting diodeFAnd working voltage V of constant current driving moduleDSAnd properly increasing a point of preset voltage, namely increasing a safety margin to obtain the power supply voltage, and controlling the voltage-stabilizing power supply module to output the power supply voltage, so that the voltage-stabilizing power supply module outputs smaller voltage and ensures that the light-emitting diode can normally work. In one embodiment, the preset voltage is 0.2V to 0.8V, and in one embodiment, the preset voltage is 0.4V.
In order to ensure that the constant current driving module outputs the maximum current, in one embodiment, the processing module is configured to control the voltage stabilization power supply module to output a second voltage and a third voltage, respectively, where the third voltage is greater than the second voltage, so that the constant current driving module outputs a second current and a third current, and the processing module is configured to detect whether the second current is equal to the third current, obtain a breakover voltage of the constant current driving module according to the third current and a corresponding function expression of the voltage and the current of the constant current driving module, and obtain a working voltage of the light emitting diode according to the third current and the corresponding function expression of the voltage and the current of the light emitting diode. Therefore, when the second current is equal to the third current, it is stated that the constant current driving module outputs the maximum current, that is, the constant current driving module is ensured to output the maximum current.
In one embodiment, the processing module is configured to control the voltage output by the voltage-stabilizing power supply module to increase, when the processing module detects that the current output by the constant-current driving module is not changed, the processing module is configured to detect the current output by the constant-current driving module through the current detection module, obtain a breakover voltage of the constant-current driving module according to the current output by the constant-current driving module and a corresponding function equation of the voltage and the current of the constant-current driving module, and obtain the operating voltage of the light emitting diode according to the current output by the constant-current driving module and the corresponding function equation of the voltage and the current of the light emitting diode. In this embodiment, the processing module controls the voltage output by the voltage stabilizing power supply module to gradually increase, the processing module detects the current output by the constant current driving module in real time, when the processing module detects that the current output by the constant current driving module does not change with the increase of the voltage output by the voltage stabilizing power supply module, the current is the maximum current output by the constant current driving module, the breakover voltage of the constant current driving module can be obtained according to the maximum current and the corresponding functional expression of the voltage and the current of the constant current driving module, and the working voltage of the light emitting diode can be obtained according to the maximum current and the corresponding functional expression of the voltage and the current of the light emitting diode.
In order to facilitate the processing module to control the voltage-stabilizing power supply module to output the power supply voltage, in one embodiment, please refer to fig. 4, the voltage-stabilizing power supply module 100 includes a resistor R1, a digital potentiometer U2 and a voltage-stabilizing power supply chip U1, an input end of the voltage-stabilizing power supply chip U1 is used for connecting a power supply, an output end of the voltage-stabilizing power supply chip U1 is connected to an input end of the constant current driving module 200, an output end of the voltage-stabilizing power supply chip U1 is further connected to a first resistance value output end of the digital potentiometer U2, a second resistance value output end of the digital potentiometer U2 is connected to a feedback end of the voltage-stabilizing power supply chip U1, a feedback end of the voltage-stabilizing power supply chip U1 is further used for grounding through the resistor R1, and an adjustment end of the digital potentiometer U2 is connected to. Specifically, digital potentiometre efficient height, response are fast, and the precision is high and control convenient characteristics can adjust the output through external circuit, and through setting up such steady voltage power supply module, the relation of the voltage of steady voltage power supply chip output and the resistance value of digital potentiometre does:
Vout＝0.8(1+RD1/R1)*Vin (1)
wherein Vin is the voltage input by the voltage-stabilizing power supply chip, Vout is the voltage output by the voltage-stabilizing power supply chip, and RD1 is the resistance value output by the digital potentiometer.
Therefore, the processing module controls the digital potentiometer to output a corresponding resistance value, and the voltage stabilizing power supply module can be controlled to output power supply voltage.
In one embodiment, the latch signal output end of the processing module is connected to the latch end of the digital potentiometer, and the processing module is configured to control the voltage stabilization power supply chip to send a latch signal to the latch end of the digital potentiometer when outputting the power supply voltage, so that the resistance value of the digital potentiometer is not changed. In one embodiment, the enable terminal of the digital potentiometer is connected to the enable control terminal of the processor, and when the enable terminal and the latch terminal of the digital potentiometer receive a high level signal, the digital potentiometer latches the output resistance value, so that the resistance value output by the digital potentiometer is unchanged after the digital potentiometer is powered on again.
In one embodiment, the digital potentiometer is of type X9C 109. Specifically, the latch end of the digital potentiometer is an INC pin of the digital potentiometer, the adjustment end of the digital potentiometer is a U/D pin of the digital potentiometer, the first resistance output end of the digital potentiometer is an RW pin of the digital potentiometer, the second resistance output end of the digital potentiometer is an RL pin of the digital potentiometer, and the enable end of the digital potentiometer is a CS pin of the digital potentiometer. In one embodiment, the model of the voltage-stabilizing power supply chip is TLV 62130. In one embodiment, the model of the constant current driving module is MBI 5153.
In order to facilitate the processing module to control the voltage-stabilizing power supply module to output the power supply voltage, in one embodiment, please refer to fig. 5, the voltage-stabilizing power supply module 100 includes a resistor R1, a digital potentiometer U2, and a voltage-stabilizing power supply chip U1, an input end of the voltage-stabilizing power supply chip U1 is used for connecting a power supply, an output end of the voltage-stabilizing power supply chip U1 is connected to an input end of the constant current driving module U2, an output end of the voltage-stabilizing power supply chip U1 is connected to a first end of the resistor R1, a second end of the resistor R1 is connected to a feedback end of the voltage-stabilizing power supply chip U1, a second end of the resistor R1 is further connected to a first resistance output end of the digital potentiometer U2, a second resistance output end of the digital potentiometer is used for grounding, and an adjustment end of the digital potentiometer is connected to. By arranging the voltage-stabilizing power supply module, the relation between the voltage output by the voltage-stabilizing power supply chip and the resistance value of the digital potentiometer is as follows:
Vout＝0.8(1+R1/RD1)*Vin (2)
wherein Vin is the voltage input by the voltage-stabilizing power supply chip, Vout is the voltage output by the voltage-stabilizing power supply chip, and RD1 is the resistance value output by the digital potentiometer.
Therefore, the processing module controls the digital potentiometer to output a corresponding resistance value, and the voltage stabilizing power supply module can be controlled to output power supply voltage.
In order to enable the processing module to obtain the current output by the constant current driving module, in one embodiment, please refer to fig. 6, the current detecting module includes a current sensor 410 and an analog-to-digital converter 420, an input end of the current sensor 410 is connected with an output end of the constant current driving module 200, an output end of the current sensor 410 is connected with an input end of the analog-to-digital converter 420, and an output end of the analog-to-digital converter 420 is connected with an input end of the processing module 300, specifically, the current sensor can measure the current like an ammeter, which has an advantage of fast response and can capture the instantaneous current change, so that the current value output by the constant current driving module can be measured, and the current is transmitted to the analog-to-digital converter, which converts the current into a specific value, so that the processing module can obtain the breakover voltage of the constant current driving module and the turn voltage of the light emitting diode The operating voltage.
In one embodiment, the current sensor is a hall current sensor. Specifically, the Hall current sensor has the characteristics of high precision and good linearity, so that the current output by the constant current driving module can be accurately measured.
In one embodiment, an LED display screen is provided, comprising the power supply feedback regulation system of any one of the above.
The display screen supplies power to the constant current driving module through the voltage-stabilizing power supply module, so that the constant current driving module outputs current, the processing module obtains the breakover voltage of the constant current driving module and the working voltage of the light-emitting diode according to the current output by the constant current driving module, obtains the minimum power supply voltage of the light-emitting diode according to the breakover voltage and the working voltage of the light-emitting diode, realizes the measurement of the minimum power supply voltage of the light-emitting diode, and realizes the function of feedback regulation by controlling the voltage-stabilizing power supply module to output the power supply voltage.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A power supply feedback regulation system is characterized by comprising a processing module, a current detection module, a constant current driving module and a voltage stabilization power supply module;
the input end of the voltage-stabilizing power supply module is used for being connected with a power supply, the output end of the voltage-stabilizing power supply module is connected with the input end of the constant current driving module, the output end of the constant current driving module is used for being connected with a light-emitting diode, the output end of the constant current driving module is connected with the input end of the current detection module, the output end of the current detection module is connected with the detection input end of the processing module, and the control output end of the processing module is connected with the adjusting end of the voltage-stabilizing power supply module;
the processing module is used for detecting the current output by the constant current driving module through the current detection module, obtaining the breakover voltage of the constant current driving module according to the current output by the constant current driving module and a corresponding function formula of the voltage and the current of the constant current driving module, obtaining the working 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 the current of the light emitting diode, calculating to obtain a power supply voltage according to the breakover voltage and the working voltage of the light emitting diode, and controlling the voltage stabilizing power supply module to output the power supply voltage; the breakover voltage is the voltage of an inflection point in a current-voltage curve of the constant current driving module.
2. The system according to claim 1, wherein 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 driving module outputs a maximum current.
3. The system according to claim 2, wherein the processing module is configured to detect a maximum current output by the constant current driving module through the current detection module, obtain a breakover voltage of the constant current driving module according to the maximum current output by the constant current driving module and a corresponding functional expression of a voltage and a current of the constant current driving module, and obtain a working voltage of the light emitting diode according to the maximum current output by the constant current driving module and a corresponding functional expression of a voltage and a current of the light emitting diode.
4. The system according to claim 3, wherein the breakover voltage of the constant current driving module is a minimum voltage corresponding to a maximum current output by the constant current driving module.
5. The system according to claim 1, wherein the processing module is further configured to add the breakover voltage, the working voltage, and a preset voltage, calculate the supply voltage, and control the regulated power supply module to output the supply voltage.
6. The system according to any one of claims 1 to 5, wherein the voltage-stabilizing power supply module includes a resistor R1, a digital potentiometer and a voltage-stabilizing power supply chip, an input terminal of the voltage-stabilizing power supply chip is used for connecting a power supply, an output terminal of the voltage-stabilizing power supply chip is connected with an input terminal of the constant current driving module, an output terminal of the voltage-stabilizing power supply chip is further connected with a first resistance value output terminal of the digital potentiometer, a second resistance value output terminal of the digital potentiometer is connected with a feedback terminal of the voltage-stabilizing power supply chip, the feedback terminal of the voltage-stabilizing power supply chip is further used for being grounded through the resistor R1, and an adjustment terminal of the digital potentiometer is connected with a control output terminal of the processing module.
7. The system according to any one of claims 1 to 5, wherein the voltage-stabilizing power supply module includes a resistor R1, a digital potentiometer and a voltage-stabilizing power supply chip, an input terminal of the voltage-stabilizing power supply chip is used for connecting a power supply, an output terminal of the voltage-stabilizing power supply chip is connected with an input terminal of the constant current driving module, an output terminal of the voltage-stabilizing power supply chip is connected with a first terminal of the resistor R1, a second terminal of the resistor R1 is connected with a feedback terminal of the voltage-stabilizing power supply chip, a second terminal of the resistor R1 is further connected with a first resistance output terminal of the digital potentiometer, a second resistance output terminal of the digital potentiometer is used for grounding, and a regulating terminal of the digital potentiometer is connected with a control output terminal of the processing module.
8. The power supply feedback regulation system of any one of claims 1 to 5 wherein the current detection module comprises a current sensor and an analog-to-digital converter, an input terminal of the current sensor is connected to an output terminal of the constant current driving module, an output terminal of the current sensor is connected to an input terminal of the analog-to-digital converter, and an output terminal of the analog-to-digital converter is connected to an input terminal of the processing module.
9. The power supply feedback adjustment system of claim 8, wherein the current sensor is a hall current sensor.
10. An LED display screen comprising the power supply feedback adjustment system of any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910644846.1A CN110262615B (en) | 2019-07-17 | 2019-07-17 | Power supply feedback adjusting system and display screen |
| PCT/CN2020/100016 WO2021008384A1 (en) | 2019-07-17 | 2020-07-03 | Power supply feedback adjustment system, and display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910644846.1A CN110262615B (en) | 2019-07-17 | 2019-07-17 | Power supply feedback adjusting system and display screen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110262615A CN110262615A (en) | 2019-09-20 |
| CN110262615B true CN110262615B (en) | 2020-09-11 |
Family
ID=67926603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910644846.1A Active CN110262615B (en) | 2019-07-17 | 2019-07-17 | Power supply feedback adjusting system and display screen |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110262615B (en) |
| WO (1) | WO2021008384A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262615B (en) * | 2019-07-17 | 2020-09-11 | 深圳市洲明科技股份有限公司 | Power supply feedback adjusting system and display screen |
| CN112233608B (en) * | 2020-10-09 | 2022-03-04 | 深圳市洲明科技股份有限公司 | Display screen adjusting method, terminal and storage medium |
| CN114294465B (en) * | 2021-12-31 | 2024-04-30 | 富奥汽车零部件股份有限公司 | Pressure regulating control device and pressure regulating control method for electromagnetic valve |
| CN115631714A (en) * | 2022-09-21 | 2023-01-20 | 常州市创联电源科技股份有限公司 | Intelligent voltage-regulating power supply method and device suitable for LED display screen |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3141527U (en) * | 2008-02-25 | 2008-05-08 | 繆復華 | LED lighting drive power supply |
| CN103037589A (en) * | 2012-12-26 | 2013-04-10 | 深圳创维－Rgb电子有限公司 | Light-emitting diode (LED) constant current drive circuit and liquid crystal display television (LCD TV) |
| CN103139970A (en) * | 2011-11-30 | 2013-06-05 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) driving circuit and LED lamp |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007074866A1 (en) * | 2005-12-28 | 2007-07-05 | Sharp Kabushiki Kaisha | Light emitting device driving circuit |
| CN101636021B (en) * | 2008-07-25 | 2012-10-03 | 海洋王照明科技股份有限公司 | LED constant current driving circuit |
| CN101581443A (en) * | 2008-12-23 | 2009-11-18 | 李孝杰 | Flameproof intrinsically safe LED illuminating lamp with unlimited output power |
| CN201438772U (en) * | 2009-06-29 | 2010-04-14 | 辉芒微电子（深圳）有限公司 | LED driving circuit |
| CN101861012A (en) * | 2010-04-20 | 2010-10-13 | 深圳茂硕电源科技股份有限公司 | Device utilizing current and voltage feedback to realize constant current control |
| US8598807B2 (en) * | 2010-05-25 | 2013-12-03 | Virginia Tech Intellectual Properties, Inc. | Multi-channel constant current source and illumination source |
| KR101883001B1 (en) * | 2010-12-09 | 2018-07-27 | 로무 가부시키가이샤 | Driving circuit of light emitting element, light emitting device using the same, and electronic device |
| US9035560B2 (en) * | 2011-01-12 | 2015-05-19 | Green Solution Technology Co., Ltd. | LED driving control circuit and LED driving circuit |
| CN201967208U (en) * | 2011-01-26 | 2011-09-07 | 深圳茂硕电源科技股份有限公司 | Multichannel constant-current source circuit that the high efficiency is simple |
| CN205213096U (en) * | 2015-10-27 | 2016-05-04 | 浙江生辉照明有限公司 | LED intelligent control circuit and LED lighting device |
| CN105554951B (en) * | 2016-01-25 | 2017-05-17 | 常州信息职业技术学院 | Current-constant voltage-constant light emitting diode (LED) driving circuit |
| CN110262615B (en) * | 2019-07-17 | 2020-09-11 | 深圳市洲明科技股份有限公司 | Power supply feedback adjusting system and display screen |
-
2019
- 2019-07-17 CN CN201910644846.1A patent/CN110262615B/en active Active
-
2020
- 2020-07-03 WO PCT/CN2020/100016 patent/WO2021008384A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3141527U (en) * | 2008-02-25 | 2008-05-08 | 繆復華 | LED lighting drive power supply |
| CN103139970A (en) * | 2011-11-30 | 2013-06-05 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) driving circuit and LED lamp |
| CN103037589A (en) * | 2012-12-26 | 2013-04-10 | 深圳创维－Rgb电子有限公司 | Light-emitting diode (LED) constant current drive circuit and liquid crystal display television (LCD TV) |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110262615A (en) | 2019-09-20 |
| WO2021008384A1 (en) | 2021-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110262615B (en) | Power supply feedback adjusting system and display screen | |
| TWI404455B (en) | Adaptive switch mode led driver | |
| CN101150904B (en) | Light control circuit | |
| KR101676440B1 (en) | Backlight unit, including plural light sources, driving method thereof, and error detection method thereof | |
| CN101390449B (en) | Voltage controlled backlight driver | |
| US20060186830A1 (en) | Automatic voltage selection for series driven LEDs | |
| TWI477187B (en) | Adaptive switch mode led system | |
| CN103037597B (en) | Multi-channel LED (Light Emitting Diode) constant current control circuit and LED light source control system | |
| JP2006344970A (en) | Two-terminal led device with tunable color | |
| CN202855272U (en) | LCD backlight constant current drive circuit based on operational amplifiernegative feedback circuit | |
| US20110133645A1 (en) | Circuits and methods for powering light source with balanced currents | |
| CN101926224A (en) | LED driver circuit and method, and system and method for estimating junction temperature of light emitting diode | |
| JP2011138716A (en) | Power supply unit, light source unit, lighting device and display device | |
| JP2000347613A (en) | Driving circuit for light emitting diode | |
| US20150061515A1 (en) | LED Lighting system | |
| CN105723807A (en) | Control circuit of light emitting diode lighting apparatus | |
| US20120262148A1 (en) | Voltage measurement apparatus | |
| JP2013004370A (en) | Illuminating device | |
| KR20040084729A (en) | Illumination apparatus, and an illumination head and power source device used therefore | |
| US7763839B2 (en) | Luminous intensity level indicating device | |
| CN100383837C (en) | Driving circuit of light-emitting diode | |
| CN110850160A (en) | Method and device for measuring power consumption of LED lighting device and storage medium | |
| CN203435180U (en) | Low-cost LED lamp self-adaptive dimming control circuit | |
| CN203327330U (en) | Mobile phone LCD backlight energy-saving drive circuit | |
| KR101028840B1 (en) | Feedback circuit of max-voltage in multiple input and led driver using it |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |