CN114024290B - Display panel power supply system and overcurrent protection method - Google Patents
Display panel power supply system and overcurrent protection method Download PDFInfo
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- CN114024290B CN114024290B CN202110713533.4A CN202110713533A CN114024290B CN 114024290 B CN114024290 B CN 114024290B CN 202110713533 A CN202110713533 A CN 202110713533A CN 114024290 B CN114024290 B CN 114024290B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/027—Details with automatic disconnection after a predetermined time
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The invention relates to a power supply system of a display panel and an overcurrent protection method, which can acquire the power supply current in a power supply circuit by connecting an input resistor in series with a power supply interface of the display panel and detecting potential parameters at two ends of the input resistor, thereby controlling the power supply current output by an input power supply according to the power supply current, avoiding damaging the display panel by large current or damaging the display panel due to misoperation such as reverse insertion, short circuit and the like, and effectively protecting the display panel.
Description
Technical Field
The invention relates to the field of semiconductor devices, in particular to a power supply system of a display panel and an overcurrent protection method.
Background
The power supply of the power supply system of the traditional display screen is directly connected to the display screen, if misoperation occurs in power supply input, such as reverse connection of the input power supply or short circuit condition exists in a power supply circuit, large current exceeding the power supply range of the display screen can occur, and therefore the problems of scalding or direct damage of a chip and the display screen are caused.
Therefore, how to effectively protect the display screen during the operation of the power supply system and avoid the damage of the display screen becomes a problem to be solved urgently.
Disclosure of Invention
In view of the above-mentioned shortcomings of the related art, an object of the present invention is to provide a power supply system and an over-current protection method for a display panel, which are aimed at solving the problem that the power supply system of the display screen lacks protection and is easy to cause damage to the display screen in the related art.
In a first aspect, the present application provides a display panel power supply system, including an input power source, a power supply line, a controller, a potential acquisition unit, and a display panel;
the power supply circuit is connected between the input power supply and a power supply interface of the display panel and comprises an input resistor and an electric control unit which are connected in series;
the input end of the controller is connected with the potential acquisition unit; the input end of the potential acquisition unit is connected with two ends of the input resistor, acquires potential parameters of the input resistor and transmits the potential parameters to the controller;
the electric control unit is connected with the output control end of the controller and is used for receiving a control instruction output by the output control end of the controller and executing the control instruction to adjust the power supply current output by the input power supply;
the controller is used for receiving the potential parameter, determining that the power supply current output by the input power supply is larger than a preset threshold value, and sending a control instruction to the electric control unit so that the electric control unit reduces the power supply current input to the display panel.
According to the display panel power supply system, the input resistor is connected in series with the power supply interface of the display panel, and the potential parameters at the two ends of the input resistor are detected, so that the power supply current in the power supply circuit can be obtained, the power supply current output by the input power supply can be controlled according to the power supply current, the display panel is prevented from being damaged by large current, or the display panel is prevented from being damaged due to misoperation such as reverse insertion and short circuit, and the display panel is effectively protected.
Optionally, the device further comprises a power supply display, wherein the power supply display is connected with the controller and used for displaying the power supply current in real time. Therefore, the power consumption conditions including the voltage and the current of the display screen can be displayed in real time, and defective products can be conveniently selected during mass production.
Optionally, the electronic control unit is connected in series between the input power supply and the input resistor; or the electric control unit is connected in series between the input resistor and the power supply interface of the display panel.
In a second aspect, the present application provides an overcurrent protection method applied to the above-mentioned power supply system of a display panel; the overcurrent protection method comprises the following steps:
the potential acquisition unit acquires potential parameters of the input resistor and transmits the potential parameters to the controller;
the controller determines whether the power supply current input by the electric control unit is greater than a preset threshold value according to the potential parameter;
if the controller judges that the power supply current is larger than the preset threshold value, the controller sends a control instruction to the electric control unit;
the electronic control unit executes the control instruction to reduce the power supply current input to the display panel.
According to the overcurrent protection method, the power supply current in the power supply circuit can be obtained by detecting the potential parameters at the two ends of the input resistor, so that the power supply current output by the input power supply can be controlled according to the power supply current, the display panel is prevented from being damaged by large current, or the display panel is prevented from being damaged by misoperation such as reverse insertion and short circuit, and the display panel is effectively protected.
Optionally, the electronic control unit comprises a switch unit; the electronic control unit executing the control instruction to reduce the power supply current input to the display panel, including:
the switching unit executes the control instruction to disconnect a power supply relationship between the input power source and the display panel to reduce the power supply current to zero.
Optionally, after the controller determines whether the supply current input by the electronic control unit is greater than a preset threshold according to the potential parameter, the method further includes:
and if the controller judges that the power supply current is larger than the preset threshold value, the controller controls the power supply display to display prompt information corresponding to power supply abnormality.
Optionally, the method further comprises:
when the controller determines that the power supply time period is longer than the preset time period when the power supply is performed on the display panel for the first time, the electric control unit is controlled to cut off the power supply of the input power supply; wherein the preset duration is T milliseconds, and T is greater than 0.
Optionally, after the controller determines whether the supply current input by the electronic control unit is greater than a preset threshold according to the potential parameter, the method further includes:
and if the controller judges that the power supply current is smaller than the preset threshold value, the controller controls the electric control unit to output the power supply current to the display panel.
Optionally, the electric potential collecting unit collects electric potential parameters of the input resistor and transmits the electric potential parameters to the controller, and the electric potential collecting unit includes:
the potential acquisition unit acquires potential parameters of the input resistor;
converting the potential parameter into a digital signal;
transmitting the digital signal to the controller.
Optionally, the collecting the potential parameter of the input resistor by the potential collecting unit and transmitting the parameter to the controller includes:
the potential acquisition unit acquires at least two groups of potential parameters and transmits the potential parameters to the controller;
the controller determines whether the power supply current input by the electric control unit is greater than a preset threshold according to the potential parameter, and the method comprises the following steps:
the controller averages at least two groups of potential parameters to obtain target potential parameters;
and the controller determines whether the power supply current input by the electric control unit is greater than a preset threshold value according to the target potential parameter.
Drawings
Fig. 1 is a schematic diagram of a power supply system of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a power supply system of a display panel according to an embodiment of the present invention;
FIG. 3 is a flowchart of an over-current protection method according to an embodiment of the present invention;
reference numerals illustrate:
11-input power supply, 12-electric control unit, 13-input resistor, 14-potential acquisition unit, 15-controller, 16-power supply display and 21-display panel.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. 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 in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In the related art, whether it is a display panel of an OLED (Organic Light-Emitting Diode), an LCD (Liquid Crystal Display) display panel, or a display panel of a Micro LED, the display panel can be used as a display panel of various displays in a corresponding scene. In the power supply system of each display panel, if misoperation such as reverse connection occurs or a short circuit phenomenon exists in a power supply line, the direct connection can cause the heating of components of the display panel or direct damage.
Based on this, the present invention is intended to provide a solution to the above technical problem, the details of which will be described in the following examples.
In the display panel power supply system illustrated in this embodiment, the input resistor 13 is connected in series to the power supply interface of the display panel 21, and the potential parameters at two ends of the input resistor 13 are detected, so that the power supply current in the power supply line can be known, and the power supply of the input power supply 11 can be controlled according to the power supply current, so that the display panel 21 is prevented from being damaged by high current, and the display panel 21 is effectively protected. For easy understanding, the following description will be made taking the display panel power supply system shown in fig. 1 as an example:
referring to fig. 1 and 2, the power supply system for a display panel includes, but is not limited to:
an input power supply 11, a power supply line, a controller 15, a potential acquisition unit 14, and a display panel 21; the power supply circuit is connected between the input power supply 11 and a power supply interface of the display panel and comprises an input resistor 13 and an electric control unit 12 which are connected in series;
the input end of the controller 15 is connected with the potential acquisition unit 14; the input end of the potential acquisition unit 14 is connected with the two ends of the input resistor 13, acquires potential parameters of the input resistor 13 and transmits the potential parameters to the controller 15;
the electronic control unit 12 is connected with an output control end of the controller 15, and is used for receiving a control instruction output by the output control end of the controller 15 and executing the control instruction to adjust the supply current output by the input power supply 11;
the controller 15 is configured to receive the potential parameter, and send a control command to the electronic control unit 12 when determining that the supply current output by the input power source 11 is greater than a preset threshold value, so that the electronic control unit 12 reduces the supply current input to the display panel 21.
The display panel 21 in the power supply system for a display panel in the embodiment of the present invention is not limited to a specific light emitting unit, and may be an LED display panel 21 or an LCD display panel 21, and is feasible in this embodiment; the display panel 21 has a power supply interface, and the power supply interface is connected to an external power supply to supply power to components in the display panel 21, such as an LED chip, a driving tube, and the like. The display panel 21 may have more than one power supply interface, and when there are a plurality of power supply interfaces, each power supply interface may be supplied with power by an independent input power source 11, or by the same input power source 11.
The input power source 11 is a power supply input path of the display panel 21, wherein the input power source 11 can perform corresponding power supply input according to the current voltage required by the normal operation of the display panel 21, and the input is generally direct current, and the direct current is converted from alternating current to direct current and then is input into the display panel 21. In other words, the input power 11 in the embodiment of the present invention may be a direct current power or a power after converting alternating current to direct current.
An input line is connected in series between the input power supply 11 and the power supply interface of the display panel 21; the purpose of the input line is to protect the display panel 21, and the input line can further detect the power supply to the display panel 21 and adjust the power supply when there is an abnormality. In the embodiment of the invention, the input circuit comprises an input resistor 13 and an electric control unit 12 which are connected in series, wherein the input resistor 13 can be a constant value resistor or a variable resistor, and in order to reduce heating and power supply loss, the resistance value of the input resistor 13 is smaller; the electronic control unit 12 is connected in series with the input resistor 13, wherein the electronic control unit 12 is used for adjusting the power supply of the input power supply 11 to the display panel 21, and the adjusting modes specifically include two modes: firstly, the adjustment is performed by switching on and off the circuit, in which case the electronic control unit 12 is equivalent to a switching unit; secondly, the adjustment is performed by increasing or decreasing the impedance, in which case the electronic control unit 12 acts as a kind of varistor, so that the power supplied by the input power 11 can be adjusted by the electronic control unit 12. That is, in the embodiment of the present invention, the electronic control unit 12 may include a switching unit or an adjusting unit, where the switching unit may implement on/off of a power supply line between the input power source 11 and the power supply interface of the display panel 21, and the adjusting unit may implement adjustment of power supply provided by the input power source 11.
In the embodiment of the present invention, the input resistor 13 and the electronic control unit 12 in the input line are connected in series, and the specific connection manner may be that the electronic control unit 12 and the input resistor 13 are connected in series in sequence along the direction from the input power source 11 to the power supply interface of the display panel 21, or the input resistor 13 and the electronic control unit 12 are connected in series in sequence along the direction from the input power source 11 to the power supply interface of the display panel 21. The two cases are specifically that the electric control unit 12 is connected in series between the input power supply 11 and the input resistor 13; or, the electronic control unit 12 is connected in series between the input resistor 13 and the power supply interface of the display panel, please refer to fig. 1 and fig. 2, which respectively show two series schematic diagrams, and both series connection manners are possible in the embodiment of the present invention. In particular, when the electronic control unit 12 is connected in series with the input power supply 11, that is, the input resistor 13 is connected in series with the power supply interface of the display panel 21, the power supply parameters at two ends of the input resistor 13 are detected, and the detected power supply parameters are closer to the power supply parameters of the display panel 21, so that the obtained result is more accurate.
In order to realize the detection of the power supply parameters in the input line, the device mainly comprises a power supply current, and can also comprise the detection of a power supply voltage, and further comprises a potential acquisition unit 14, wherein two input ends of the potential acquisition unit 14 are respectively connected to two ends of an input resistor 13, and the potential parameters at two ends of the input resistor 13 can be acquired, so that the situation that the voltage at two ends of the input resistor 13 can be obtained after the current flows through the input resistor 13 is known. According to ohm's law, the voltage across the input resistor 13 is proportional to the current flowing through it, and the proportional coefficient is the resistance of the input resistor 13, namely, the formula is as follows: i= Δu/R, and Δu = Ub-Ua, resulting in i= (Ub-Ua)/R; where Δu represents the voltage difference across the input resistor 13, ua represents the potential at the input of the input resistor 13, ub represents the potential at the output of the input resistor 13, and I represents the current flowing through the input resistor 13, i.e. the supply current.
After the potential parameters at the two ends of the input resistor 13 are acquired, the power supply current can be further obtained; after the electric potential parameter is acquired by the electric potential acquisition unit 14, the electric potential acquisition unit 14 sends the acquired electric potential parameter to the controller 15, and the controller 15 determines the power supply current in the power supply line according to the electric potential parameter. The specific components of the controller 15 may be a CPU (central processing unit ), MCU (Microcontroller Unit, micro control unit), FPGA (Field Programmable Gate Array ) or the like having an arithmetic control function.
If the operation result of the controller 15 indicates that the supply current is greater than the preset threshold, a control instruction is output to the electronic control unit 12 through the output control end of the controller 15, so as to control the electronic control unit 12 to adjust the supply current output by the input power supply 11. The preset threshold value of the supply current is set to be an upper limit value of the supply current which can be borne in the normal operation state of the display panel 21, and a supply current smaller than the upper limit value is considered to be normal supply. The manner of adjustment varies depending on the type of electronic control unit 12. If the electronic control unit 12 is a switching unit, the adjustment may be by switching off the power supply to the input power source 11 or by reducing the supply current to zero; if the electronic control unit 12 is an adjustment unit, the power supply input by the input power source 11 can be reduced by an amount based on the electronic control unit 12, and the reduction of the power supply current can be achieved.
In some embodiments, to enable interaction between the potential acquisition unit 14 and the controller 15, the potential acquisition unit 14 may further comprise an analog-to-digital converter for converting the acquired potential parameters into digital signals and transmitting to the controller 15.
In addition, in some embodiments, a power supply display 16 may be further included, where the power supply display 16 is connected to the controller 15 for displaying the power supply current in real time. The power supply display 16 can display the power supply condition in the power supply line in real time according to the processing result of the controller 15, wherein the power supply condition can include a power supply current and a power supply voltage, which are equivalent to the power supply current and the power supply voltage of the display panel 21, so that a worker can know the power supply condition of the display panel 21 in real time and make corresponding processing in time. From the display of the supply current by the supply display 16, the worker can also determine the power consumption condition of the corresponding display panel 21, so that defective products can be screened from a large number of display panels 21.
The embodiment of the invention provides a power supply system for a display panel, which can acquire the power supply current in a power supply line by connecting an input resistor 13 in series with a power supply interface of the display panel 21 and detecting potential parameters at two ends of the input resistor 13, so that the power supply current output by an input power supply 11 can be controlled according to the power supply current, the display panel 21 is prevented from being damaged by high current or the display panel 21 is prevented from being damaged due to misoperation such as reverse insertion, short circuit and the like, and the display panel 21 is effectively protected.
Another alternative embodiment of the invention:
the embodiment provides an overcurrent protection method, please refer to fig. 3, which is applied to a power supply system of a display panel in an embodiment of the invention; the method comprises the following steps:
s301, a potential acquisition unit acquires potential parameters of an input resistor and transmits the potential parameters to a controller;
s302, the controller determines whether the power supply current input by the electric control unit is greater than a preset threshold value according to the potential parameter;
s303, if the controller judges that the power supply current is greater than a preset threshold value, the controller sends a control instruction to the electric control unit;
s304, the electric control unit executes a control instruction to reduce the power supply current input to the display panel.
The overcurrent protection method in the embodiment is applied to the display panel power supply system in the embodiment. The display panel power supply system comprises an input power supply 11, a power supply line, a controller 15, a potential acquisition unit 14 and a display panel 21; the power supply circuit is connected between the input power supply 11 and a power supply interface of the display panel and comprises an input resistor 13 and an electric control unit 12 which are connected in series;
the input end of the controller 15 is connected with the potential acquisition unit 14; the input end of the potential acquisition unit 14 is connected with the two ends of the input resistor 13, acquires potential parameters of the input resistor 13 and transmits the potential parameters to the controller 15;
the electronic control unit 12 is connected with an output control end of the controller 15, and is used for receiving a control instruction output by the output control end of the controller 15 and executing the control instruction to adjust the supply current output by the input power supply 11;
the controller 15 is configured to receive the potential parameter, and send a control command to the electronic control unit 12 when determining that the supply current output by the input power source 11 is greater than a preset threshold value, so that the electronic control unit 12 reduces the supply current input to the display panel 21. In this embodiment, the power supply current input by the electronic control unit 12 is provided by the input power source 11, that is, the power supply current output by the input power source 11 is provided to the display panel 21 via the electronic control unit 12.
In some embodiments, the electronic control unit 12 may specifically include a switching unit; wherein the electronic control unit 12 executes a control instruction to reduce a power supply current input to the display panel, may specifically include:
the switching unit executes a control instruction to disconnect the power supply relationship between the input power source 11 and the display panel 21 to reduce the power supply current to zero. That is, the switching unit can realize on-off of power supply between the input power source 11 and the display panel 21.
In some embodiments, after the controller 15 determines whether the supply current input by the electronic control unit 12 is greater than the preset threshold according to the potential parameter, the over-current protection method may further include:
if the controller 15 determines that the power supply current is greater than the preset threshold, the controller 15 controls the power supply display 16 to display the prompt message corresponding to the power supply abnormality. If the power supply current is greater than the preset threshold, the controller 15 can correspondingly control the power supply display 16 connected with the power supply current, so that the power supply display 16 displays the abnormal condition of the excessive power supply current through corresponding prompt information, and a worker can timely learn the abnormal condition of the circuit and process the abnormal condition correspondingly.
In some embodiments, the overcurrent protection method may further include:
when the controller 15 determines that the power supply time period is longer than the preset time period, the electric control unit 12 is controlled to cut off the power supply of the input power supply 11; wherein the preset duration is T milliseconds, and T is greater than 0. If the power is supplied to the display panel 21 for the first time, since the power supply condition of the display panel 21 is not stable, the display panel 21 can be powered instantaneously, and the power supply condition is tested first. In other words, when the display panel 21 is initially supplied with power, the period of time of the power supply should be short, so that the short-time power supply is insufficient to damage the display panel 21 or has less influence on the display panel 21 even when the power supply current of the initial power supply is large. That is, the preset time period is relatively short, and is usually set to be in the millisecond level, and the millisecond level power supply does not damage the electronic components. The power-on time needs to be short enough, and the potential acquisition unit 14 can normally acquire the required potential data.
The way of cutting off the power supply of the input power 11 at the time of the initial power supply may be implemented by the electronic control unit 12, and the controller 15 may control the electronic control unit 12 such that the electronic control unit 12 cuts off the power supply of the input power 11.
In some embodiments, after the controller 15 determines whether the supply current input by the electronic control unit 12 is greater than a preset threshold according to the potential parameter, the over-current protection method may further include:
if the controller 15 determines that the supply current is less than the preset threshold, the controller 15 controls the electronic control unit 12 to output the supply current to the display panel 21. If the detection result of the controller 15 indicates that the power supply current in the power supply line is smaller than the preset threshold value during the primary power supply, it is reasonable to indicate that the power supply condition of the input power supply 11 is reasonable, and then the power supply of the input power supply 11 can be re-connected, that is, the controller 15 can control the electronic control unit 12 to re-connect the input power supply 11, so that the power supply of the input power supply 11 can be normally supplied to the display panel 21. After the primary power-on and power-off, the power supply is normally restored, and the power supply condition can be continuously detected at this time, that is, the processes of collecting potential parameters, calculating the power supply current and displaying the power supply current and the power supply voltage are always executed, once the power supply current exceeding the preset threshold is found, the controller 15 further controls the electronic control unit 12, and further controls the on-off or the magnitude of the input power supply 11.
In some embodiments, the electric potential collecting unit 14 collects the electric potential parameter of the input resistor 13, and transmits the electric potential parameter to the controller 15 may specifically include:
the potential acquisition unit 14 acquires potential parameters of the input resistor 13;
converting the potential parameter into a digital signal;
the digital signal is transmitted to the controller 15. Wherein converting the digital signal may be implemented by an analog-to-digital converter.
In some embodiments, the electric potential collecting unit 14 collects electric potential parameters of the input resistor 13 and transmits the electric potential parameters to the controller, which may specifically include:
the potential acquisition unit 14 acquires at least two groups of potential parameters and transmits the parameters to the controller 15;
the controller 15 determines whether the supply current input by the electronic control unit 12 is greater than a preset threshold according to the potential parameter, which may specifically include:
the controller 15 averages at least two groups of potential parameters to obtain target potential parameters;
the controller 15 determines whether the supply current input by the electronic control unit 12 is greater than a preset threshold value according to the target potential parameter. In order to improve the accuracy of collecting the potential parameters, the potential collecting unit 14 can collect the potential parameters for a plurality of times in a short time and send the potential parameters to the controller 15, the controller 15 can average the potential parameters, obtain the target potential parameters based on the average value, and then determine the power supply current in the power supply line based on the target potential parameters, so that larger errors on actual results caused by the accident of single-group data can be avoided, and the detection accuracy is improved. When the controller 15 averages the potential parameters, it may directly take an arithmetic average value, or take a weighted average value according to the distribution of the potential parameters, or take an average value after removing the highest value and the lowest value, so as to obtain reasonable target potential parameters.
The overcurrent protection method provided by the embodiment of the invention is applied to the display panel power supply system provided by the embodiment of the invention, and the power supply current in the power supply line can be obtained by detecting the potential parameters at the two ends of the input resistor, so that the power supply current output by the input power supply can be controlled according to the power supply current, the display panel is prevented from being damaged by high current or is damaged by misoperation such as reverse insertion and short circuit, and the display panel is effectively protected.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (10)
1. The display panel power supply system is characterized by comprising an input power supply, a power supply circuit, a controller, a potential acquisition unit and a display panel;
the power supply circuit is connected between the input power supply and a power supply interface of the display panel and comprises an input resistor and an electric control unit which are connected in series;
the input end of the controller is connected with the potential acquisition unit; the input end of the potential acquisition unit is connected with two ends of the input resistor, acquires potential parameters of the input resistor and transmits the potential parameters to the controller;
the electric control unit is connected with the output control end of the controller and is used for receiving a control instruction output by the output control end of the controller and executing the control instruction to adjust the power supply current output by the input power supply;
the controller is used for receiving the potential parameter, determining that the power supply current output by the input power supply is larger than a preset threshold value, and sending a control instruction to the electric control unit so that the electric control unit reduces the power supply current input to the display panel;
the electric control unit comprises a rheostat which adjusts impedance according to the control instruction so that the electric control unit reduces the power supply current input to the display panel.
2. The display panel power supply system of claim 1, further comprising a power supply display coupled to the controller for displaying power supply current in real time.
3. The display panel power supply system according to claim 1 or 2, wherein,
the electric control unit is connected in series between the input power supply and the input resistor;
or alternatively, the first and second heat exchangers may be,
the electric control unit is connected in series between the input resistor and the power supply interface of the display panel.
4. An overcurrent protection method, characterized by being applied to the display panel power supply system as claimed in any one of claims 1 to 3; the overcurrent protection method comprises the following steps:
the potential acquisition unit acquires potential parameters of the input resistor and transmits the potential parameters to the controller;
the controller determines whether the power supply current input by the electric control unit is greater than a preset threshold value according to the potential parameter;
if the controller judges that the power supply current is larger than the preset threshold value, the controller sends a control instruction to the electric control unit;
the electronic control unit executes the control instruction to reduce the power supply current input to the display panel; the electric control unit comprises a rheostat which adjusts impedance according to the control instruction so that the electric control unit reduces the power supply current input to the display panel.
5. The overcurrent protection method of claim 4, wherein the electronic control unit comprises a switching unit; the electronic control unit executing the control instruction to reduce the power supply current input to the display panel, including:
the switching unit executes the control instruction to disconnect a power supply relationship between the input power source and the display panel to reduce the power supply current to zero.
6. The overcurrent protection method of claim 4, wherein after the controller determines whether the supply current input by the electronic control unit is greater than a preset threshold according to the potential parameter, the method further comprises:
and if the controller judges that the power supply current is larger than the preset threshold value, the controller controls the power supply display to display prompt information corresponding to power supply abnormality.
7. The overcurrent protection method of claim 4, further comprising:
when the controller determines that the power supply time period is longer than the preset time period when the power supply is performed on the display panel for the first time, the electric control unit is controlled to cut off the power supply of the input power supply; wherein the preset duration is T milliseconds, and T is greater than 0.
8. The overcurrent protection method of claim 4, wherein after the controller determines whether the supply current input by the electronic control unit is greater than a preset threshold according to the potential parameter, the method further comprises:
and if the controller judges that the power supply current is smaller than the preset threshold value, the controller controls the electric control unit to output the power supply current to the display panel.
9. The overcurrent protection method of claim 8, wherein the potential acquisition unit acquires the potential parameter of the input resistor and transmits the parameter to the controller, comprising:
the potential acquisition unit acquires potential parameters of the input resistor;
converting the potential parameter into a digital signal;
transmitting the digital signal to the controller.
10. The overcurrent protection method of claim 8, wherein the potential acquisition unit acquiring the potential parameter of the input resistor and transmitting to the controller comprises:
the potential acquisition unit acquires at least two groups of potential parameters and transmits the potential parameters to the controller;
the controller determines whether the power supply current input by the electric control unit is greater than a preset threshold according to the potential parameter, and the method comprises the following steps:
the controller averages at least two groups of potential parameters to obtain target potential parameters;
and the controller determines whether the power supply current input by the electric control unit is greater than a preset threshold value according to the target potential parameter.
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