Power supply switching module of direct current screen and power supply switching method of direct current screen

Abstract

The embodiment of the invention provides a power supply switching module of a direct current screen and a power supply switching method of the direct current screen. The power supply switching module of the direct current screen comprises a protection unit, an electrical parameter detection unit, a relay and a control unit, the protection unit is used for suppressing the abnormal high voltage of the working power supply; the working power supply is a first power supply or a second power supply; the electrical parameter detection unit is used for detecting an electrical parameter value corresponding to the working power supply and sending the electrical parameter value to the control unit; the control unit is used for sending a switching signal to the relay under the condition that the working power supply is determined to have a fault according to the electrical parameter value; and the relay is used for switching the switching state of the first end according to the switching signal so as to switch the working power supply from the first power supply to the second power supply or from the second power supply to the first power supply. The power supply switching module of the DC screen is used for timely detecting the fault of the working power supply and timely switching the working power supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of DC screen, in particular to a power switching module of DC screen and a power switching method of DC screen. BACKGROUND

[0002] As the core power supply equipment of the power system, the core function of the DC screen is to output stable DC power after rectification, filtering and voltage stabilization of the AC power supply, to provide continuous power for key devices such as high and low voltage switch cabinet operating mechanism, protection terminal and instrument, and is the "lifeline" to ensure the reliable operation of the power grid equipment.

[0003] In the related art, the power failure of the DC screen is found by manual inspection, and the power is replaced, which cannot determine the fault and switch the power in time, so that when the power fails, the rear load loses power, affecting the stability of the operation of the DC screen. SUMMARY

[0004] The power switching module and the power switching method of the DC screen provided by the embodiments of the present application can detect the fault of the working power supply in time and switch the working power supply in time.

[0005] In a first aspect, the embodiments of the present application provide a power switching module of a DC screen, which comprises a protection unit, an electric parameter detection unit, a relay and a control unit; the first input end and the second input end of the protection unit are connected with a first power supply and a second power supply respectively; the first output end and the second output end of the protection unit are connected with the first end of the relay; the second end of the relay is connected with a charging module of the DC screen; the control end of the relay is connected with the control unit; the protection unit is used for suppressing abnormal high voltage of the working power supply; the working power supply is the first power supply or the second power supply; the electric parameter detection unit is used for detecting an electric parameter value corresponding to the working power supply and sending the electric parameter value to the control unit; the control unit is used for sending a switching signal to the relay in the case that it is determined that the working power supply has a fault according to the electric parameter value; and the relay is used for switching the switching state of the first end according to the switching signal, so as to switch the working power supply from the first power supply to the second power supply or from the second power supply to the first power supply.

[0006] In a second aspect, the embodiments of the present application provide a power switching method of a DC screen, which comprises: in the case that the working power supply outputs abnormal high voltage, suppressing the abnormal high voltage by a protection unit;

[0007] detecting an electric parameter value corresponding to the working power supply by an electric parameter detection unit and sending the electric parameter value to a control unit;

[0008] determining whether the working power supply has a fault according to the electric parameter value by the control unit, and sending a switching signal to a relay in the case that it is determined that the working power supply has a fault;

[0009] The relay switches the switch state of the first end of the relay according to the switching signal to switch the working power supply from the first power supply to the second power supply or from the second power supply to the first power supply.

[0010] In a third aspect, the embodiments of the present application provide a computer readable storage medium, and the computer readable storage medium stores computer execution instructions. When the computer execution instructions are executed by a processor, the computer execution instructions are used to implement the second aspect and / or various possible implementation manners of the second aspect.

[0011] In a fourth aspect, the embodiments of the present application provide a computer program product, which includes a computer program. When the computer program is executed by a processor, the computer program implements the second aspect and / or various possible implementation manners of the second aspect.

[0012] The power supply switching module of the DC screen and the power supply switching method of the DC screen provided by the embodiments of the present application, the power supply switching module of the DC screen includes: a protection unit, an electrical parameter detection unit, a relay and a control unit; the first input end and the second input end of the protection unit are connected with the first power supply and the second power supply respectively; the first output end and the second output end of the protection unit are connected with the first end of the relay; the second end of the relay is connected with the charging module of the DC screen; and the control end of the relay is connected with the control unit. The protection unit is used to suppress the abnormal high voltage of the working power supply; the working power supply is the first power supply or the second power supply; in the case of lightning stroke or sudden rise of the grid voltage, the protection unit can suppress the abnormal high voltage, can avoid damage of the power supply switching module of the DC screen caused by the abnormal high voltage, and can avoid the abnormal high voltage from causing faults of other modules of the DC screen, thereby reducing the failure rate of the power supply switching module and the DC screen as a whole; through the electrical parameter detection unit, the control unit and the relay, it is determined whether the working power supply is faulty according to the electrical parameters, and when it is determined that the working power supply is faulty, the working power supply is automatically switched, so that another power supply can be quickly switched for power supply in the case of working power supply failure, the timeliness of switching is improved in the case of power supply failure, the situation of power loss of the rear load is avoided, and the stability of the power supply switching module and the DC screen as a whole is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0014] Figure 1 The schematic diagram of the power supply switching module of the DC screen provided by the present application Figure 1 ;

[0015] Figure 2 The schematic diagram of the power supply switching module of the DC screen provided by the present application Figure 2 ;

[0016] Figure 3 A schematic diagram of a power switching module of a DC panel Figure 3 ;

[0017] Figure 4 A schematic diagram of a power switching method of a DC panel.

[0018] The specific embodiments of the present application have been shown and described in the above description, and will be more fully appreciated through the following detailed description. The drawings and detailed description are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0019] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless the context clearly dictates otherwise. The following description of exemplary embodiments is not intended to represent all embodiments in accordance with the present application. Rather, they are merely examples in accordance with some aspects of the present application as detailed in the appended claims.

[0020] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0021] Figure 1 The power switching module of the DC panel provided by the present application comprises: a protection unit, an electrical parameter detection unit, a relay and a control unit; the first input end and the second input end of the protection unit are connected to the first power supply and the second power supply respectively; the first output end and the second output end of the protection unit are connected to the first end of the relay; the second end of the relay is connected to the charging module of the DC panel; and the control end of the relay is connected to the control unit.

[0022] The protection unit is used to suppress abnormal high voltage of the working power supply; the working power supply is the first power supply or the second power supply;

[0023] The electrical parameter detection unit is used to detect the electrical parameter value corresponding to the working power supply and send it to the control unit.

[0024] The control unit is used to send a switching signal to the relay in the case where it is determined according to the electrical parameter value that the working power supply has a fault.

[0025] The relay is used to switch the switching state of the first end according to the switching signal, so as to switch the working power supply from the first power supply to the second power supply, or from the second power supply to the first power supply.

[0026] Optionally, referring to Figure 1 , the first input end and the second input end of the electric parameter detection unit are connected with the first power supply and the second power supply respectively, and the first output end and the second output end of the electric parameter detection unit are connected with the control unit; optionally, referring to Figure 2 , the first input end and the second input end of the electric parameter detection unit are connected with the first output end and the second output end of the protection unit respectively.

[0027] Specifically, when the working power supply is the first power supply, if the first power supply generates an abnormally high voltage, the protection unit can suppress the abnormally high voltage of the first power supply; when the working power supply is the first power supply, the voltage value and the current value of the first power supply are detected in real time by the electric parameter detection unit, and the voltage value and the current value of the first power supply are sent to the control unit, the control unit determines whether the first power supply is abnormal according to the voltage value and the current value, if it is determined that the first power supply is abnormal, a switching signal is sent to the relay, so that the relay switches the switching state of the first end thereof, so as to switch the working power supply from the first power supply to the second power supply.

[0028] When the working power supply is the second power supply, if the second power supply generates an abnormally high voltage, the protection unit can suppress the abnormally high voltage of the second power supply; when the working power supply is the second power supply, the voltage value and the current value of the second power supply are detected in real time by the electric parameter detection unit, and the voltage value and the current value of the second power supply are sent to the control unit, the control unit determines whether the second power supply is abnormal according to the voltage value and the current value, if it is determined that the second power supply is abnormal, a switching signal is sent to the relay, so that the relay switches the switching state of the first end thereof, so as to switch the working power supply from the second power supply to the first power supply.

[0029] Wherein, the relay is a double-way relay; the first end of the double-way relay includes a normally open end, a normally closed end and a common end; optionally, the first power supply is connected with the normally open end, and the second power supply is connected with the normally closed end; when the first power supply works, the normally open end is connected with the common end; when the second power supply works, the normally closed end is connected with the common end; it should be noted that the relay switches the switching state of the first end according to the switching signal, which means that the relay switches the normally open end to be connected with the common end according to the switching signal, and switches to the normally closed end to be connected with the common end, or switches the normally closed end to be connected with the common end, and switches to the normally open end to be connected with the common end.

[0030] It should be noted that the power supply switching module provided by the embodiment of the application can be adapted to the transformation of old DC screens, only the original power supply module needs to be replaced, without the need for re-wiring; and the power supply switching module provided by the embodiment of the application supports DC110V / 220V two kinds of rated output, is compatible with multiple communication protocols, can access the existing power grid operation and maintenance platform, and reduces the transformation cost.

[0031] In the related art, the power failure of the DC screen is found by manual inspection, and the power is replaced. The failure cannot be determined in time, and the power cannot be switched in time. When the power fails, the rear load loses power. In addition, the voltage resistance is weak. In the case of lightning or sudden rise of power grid voltage, the DC screen is prone to failure or damage, which seriously affects the stable operation of the DC screen.

[0032] The power switching module of the DC screen provided by the embodiment of the application comprises a protection unit, an electric parameter detection unit, a relay and a control unit. The first input end and the second input end of the protection unit are connected with the first power supply and the second power supply respectively. The first output end and the second output end of the protection unit are connected with the first end of the relay. The second end of the relay is connected with the charging module of the DC screen. The control end of the relay is connected with the control unit. The protection unit is used for suppressing the abnormally high voltage of the working power supply. The working power supply is the first power supply or the second power supply. In the case of lightning or sudden rise of power grid voltage, the protection unit can suppress the abnormally high voltage, can avoid damage of the power switching module of the DC screen caused by the abnormally high voltage, and can avoid failure of other modules of the DC screen caused by the abnormally high voltage, thereby reducing the failure rate of the power switching module and the DC screen as a whole. Through the electric parameter detection unit, the control unit and the relay, it is determined whether the working power supply fails according to the electric parameter, and the working power supply is automatically switched when it is determined that the working power supply fails. In the case of failure of the working power supply, another power supply can be quickly switched for power supply, the timeliness of switching is improved in the case of power failure, the situation that the rear load loses power is avoided, and the stability of the power switching module and the DC screen as a whole is improved.

[0033] In some embodiments, the protection unit comprises a first resistor and a second resistor. The first end of the first resistor is connected with the first power supply, the second end of the first resistor is grounded, and the first end of the relay is connected. The first end of the second resistor is connected with the second power supply, the second end of the second resistor is grounded, and the first end of the relay is connected.

[0034] The first resistor and the second resistor can be metal oxide varistors (MOV). The specifications of the metal oxide varistors can be determined according to actual needs. The first resistor is connected in parallel on the input side of the first power supply, and the second resistor is connected in parallel on the input side of the second power supply.

[0035] When the first power supply is working, if the voltage of the first power supply exceeds the first preset multiple of the rated voltage (abnormally high voltage), the first resistor is turned on, and the abnormally high voltage is discharged to the ground, so as to avoid failure of the power switching module and the DC screen as a whole caused by the abnormally high voltage.

[0036] When the second power supply is working, if the voltage of the second power supply exceeds the first preset multiple of the rated voltage, the second resistor is turned on, and the abnormally high voltage is discharged to the ground, so as to avoid failure of the power switching module and the DC screen as a whole caused by the abnormally high voltage.

[0037] In the above embodiment, the protection unit includes the first resistor and the second resistor, and the abnormal high voltage of the first power supply or the second power supply is discharged through the first resistor or the second resistor, so as to avoid that the abnormal high voltage causes the overall failure of the power switching module and the DC screen.

[0038] In some embodiments, the protection unit includes: a first transient voltage suppression diode and a second transient voltage suppression diode; a first end of the first transient voltage suppression diode is connected to the second power supply, a second end of the first transient voltage suppression diode is grounded, and a first end of the relay is connected; a first end of the second transient voltage suppression diode is connected to the second power supply, a second end of the second transient voltage suppression diode is grounded, and a first end of the relay is connected.

[0039] The first transient voltage suppression diode and the second transient voltage suppression diode can be transient voltage suppression diodes (TVS).

[0040] When the first power supply is working, if the voltage of the first power supply exceeds the second preset multiple of the rated voltage (abnormal high voltage), the first transient voltage suppression diode is broken down and turned on to suppress the abnormal high voltage.

[0041] When the second power supply is working, if the voltage of the second power supply exceeds the second preset multiple of the rated voltage (abnormal high voltage), the second transient voltage suppression diode is broken down and turned on to suppress the abnormal high voltage.

[0042] The first preset multiple and the second preset multiple are both greater than 1; the first preset multiple is less than the second preset multiple, that is, the first resistor and the second resistor constitute a first-level protection unit for suppressing the abnormal high voltage exceeding the first preset multiple of the rated voltage, and the first transient voltage suppression diode and the second transient voltage suppression diode constitute a second-level protection unit for suppressing the abnormal high voltage exceeding the second preset multiple of the rated voltage; in actual application, the first preset multiple can be 1.5, and the second preset multiple can be 2.

[0043] In the above embodiment, the protection unit includes the first transient voltage suppression diode and the second transient voltage suppression diode, and the abnormal high voltage of the first power supply or the second power supply is discharged through the first transient voltage suppression diode or the second transient voltage suppression diode, so as to avoid that the abnormal high voltage causes the overall failure of the power switching module and the DC screen.

[0044] In some embodiments, the power switching module further includes an overvoltage detection unit; the overvoltage detection unit is configured to detect an input voltage of a power supply circuit corresponding to a working power supply, and send an overvoltage signal to the control unit when the input voltage is greater than a preset voltage threshold; the control unit is further configured to send a switching signal to the relay according to the overvoltage signal.

[0045] The overvoltage detection unit includes a first overvoltage detection subunit and a second overvoltage detection subunit, a first end of the first overvoltage detection subunit is connected with the first power supply, and a second end of the first overvoltage detection subunit is connected with the control unit; a first end of the second overvoltage detection subunit is connected with the second power supply, and a second end of the second overvoltage detection subunit is connected with the control unit.

[0046] When the working power supply is the first power supply, the first overvoltage detection subunit detects the first input voltage of the first power supply in real time, and determines whether the first input voltage is greater than a preset voltage threshold value, if the first input voltage is greater than the preset voltage threshold value, it is determined that the first power supply has an overvoltage condition, and then the first overvoltage detection subunit sends an overvoltage signal to the control unit, and the control unit sends a switching signal to the relay according to the overvoltage signal.

[0047] When the working power supply is the second power supply, the second overvoltage detection subunit detects the second input voltage of the second power supply in real time, and determines whether the second input voltage is greater than a preset voltage threshold value, if the second input voltage is greater than the preset voltage threshold value, it is determined that the second power supply has an overvoltage condition, and then the second overvoltage detection subunit sends an overvoltage signal to the control unit, and the control unit sends a switching signal to the relay according to the overvoltage signal.

[0048] The preset voltage threshold value can be a third preset multiple of the rated voltage value, the third preset multiple is greater than 1, and the value of the third preset multiple can be set according to actual requirements; for example, the third preset multiple can be a value in [1.2, 1.5], and the third preset multiple can also be a value in [1.2, 2].

[0049] For example, the embodiment of the application provides three levels of overvoltage protection, the first level is to suppress the abnormally high voltage of the first power supply or the second power supply through the first resistor or the second resistor, which can suppress the abnormally high voltage exceeding 1.2 times of the rated voltage; the second level is to suppress the abnormally high voltage exceeding 1.5 times of the rated voltage through the first transient voltage suppression diode or the second transient voltage suppression diode; the third level is to send an overvoltage signal to the control unit when it is determined that the input voltage of the first power supply or the second power supply is greater than the preset voltage threshold value through the first overvoltage detection subunit or the second overvoltage detection subunit, so that the control unit sends a switching signal to the relay, and the working power supply is switched to avoid the working power supply continuously outputting high voltage, which affects the power supply switching module and the DC screen as a whole.

[0050] In some embodiments, the electrical parameter detection unit comprises a current sensor and a voltage sampler; the current sensor is configured to detect a current value corresponding to the working power supply and send the current value to the control unit; the voltage sampler is configured to detect a voltage value corresponding to the working power supply and send the voltage value to the control unit; the control unit is further configured to determine that the working power supply is faulty and send a switching signal to the relay when the current value is less than a preset current threshold or a difference between the voltage value and a preset voltage value meets a preset condition.

[0051] In some embodiments, the electrical parameter detection unit comprises a first electrical parameter detection subunit and a second electrical parameter detection subunit; the current sensor comprises a first current sensor and a first voltage sampler; the first electrical parameter detection subunit comprises the first current sensor and the first voltage sampler; the second electrical parameter detection subunit comprises a second current sensor and a second voltage sampler.

[0052] Specifically, when the working power supply is the first power supply, the first current sensor is configured to detect a first current value of the first power supply and send the first current value to the control unit; the first voltage sampler is configured to detect a first voltage value of the first power supply and send the first voltage value to the control unit.

[0053] The control unit is configured to determine whether the first current value is less than a preset current threshold, calculate a first difference between the first voltage value and a preset voltage value, calculate a first ratio of the first difference to the preset voltage value, and determine whether the first ratio is greater than a preset proportion; if the first current value is less than the preset current value or the first ratio is greater than the preset proportion, the control unit determines that the first power supply is faulty and sends a switching signal to the relay.

[0054] When the working power supply is the second power supply, the second current sensor is configured to detect a second current value of the second power supply and send the second current value to the control unit; the second voltage sampler is configured to detect a second voltage value of the first power supply and send the second voltage value to the control unit.

[0055] The control unit is configured to determine whether the second current value is less than a preset current threshold, calculate a second difference between the second voltage value and a preset voltage value, calculate a second ratio of the second difference to the preset voltage value, and determine whether the second ratio is greater than a preset proportion; if the second current value is less than the preset current value or the second ratio is greater than the preset proportion, the control unit determines that the second power supply is faulty and sends a switching signal to the relay.

[0056] In some embodiments, the first current value less than the preset current threshold indicates that the first power supply has no load output; similarly, the second current value less than the preset current threshold indicates that the second current has no load output; the first ratio greater than the preset proportion indicates that the voltage fluctuation of the first power supply output is large; similarly, the second ratio greater than the preset proportion indicates that the voltage fluctuation of the second power supply output is large.

[0057] When the first power supply has no load output or the voltage fluctuates greatly, it is determined that the first power supply has a fault; when the second power supply has no load output or the voltage fluctuates greatly, it is determined that the second power supply has a fault.

[0058] The preset current threshold and the preset proportion can be set according to actual needs. For example, the preset current threshold can be 0.1 A, and the preset proportion can be 10%.

[0059] In the above embodiments, whether the working power supply has a fault is determined by detecting the voltage and the current, manual inspection is not required, the fault of the working power supply can be found in time, the working power supply can be automatically switched when it is determined that the working power supply has a fault, another power supply can be quickly switched for power supply in the case of a fault of the working power supply, millisecond-level switching can be realized, the timeliness of power supply switching is improved, the situation of power loss of the rear load is avoided, and the stability of the power supply switching module and the DC panel as a whole is improved.

[0060] In some embodiments, the power supply switching module further comprises a communication unit and a voice unit; the control unit is configured to generate fault data of the working power supply when it is determined that the working power supply has a fault, determine a voice message corresponding to the fault data, send the fault data to the communication unit, and send the voice message to the voice unit; the communication unit is configured to receive the fault data sent by the control unit and send the fault data to a terminal of the DC panel; the voice unit is configured to receive the voice message sent by the control unit, store the voice message, and play the voice message; and the voice unit is further configured to receive a voice query instruction triggered by a user and play the latest stored voice message according to the voice query instruction.

[0061] Specifically, the control unit generates fault data of the working power supply. For example, the fault data can be a fault code; for example, the fault code of overvoltage is 0x01, the fault code of no load output is 0x02, and the fault code of large voltage fluctuation is 0x03; the fault data can also be detailed fault data, such as an electrical parameter value corresponding to the fault, time data, and the like.

[0062] The control unit sends the fault data to the communication unit, and the communication unit can encrypt the fault data before sending it to a monitoring host of the DC panel. In actual application, the communication unit can store multiple pieces of fault data to facilitate export through a communication interface for operation and maintenance analysis. In actual application, the communication unit can include an RS485 communication chip, an encryption unit, and a communication interface.

[0063] The control unit determines a voice message corresponding to the fault data in a preset voice message, sends the voice message corresponding to the fault data to the voice unit, and the voice unit plays the voice message. For example, the preset voice message can be: no load output, please check the power supply; or, the voltage is too high, the power supply has been switched.

[0064] The voice unit can store the latest received voice message, and play the stored voice message when receiving a user triggered voice query instruction; the user triggered voice message can be triggered by a voice query button configured outside the power switching module by the user.

[0065] In the above embodiment, the fault data is sent to the terminal of the DC screen, and in combination with the local voice broadcast, the fault condition can be timely sent to the worker, so that the worker can timely troubleshoot the fault, and the fault processing time is effectively reduced.

[0066] As shown in Figure 3 The power switching module adopts an integrated packaging design, the shell is made of flame-retardant ABS material, and the internal integrated electric parameter detection unit, protection unit, communication unit, voice unit, relay and control unit.

[0067] The power switching module of the DC screen provided by the embodiment of the application comprises a protection unit, an electric parameter detection unit, a relay and a control unit; the first input end and the second input end of the protection unit are connected with a first power supply and a second power supply respectively; the first output end and the second output end of the protection unit are connected with the first end of the relay; the second end of the relay is connected with a charging module of the DC screen; and the control end of the relay is connected with the control unit. The protection unit is used for suppressing abnormal high voltage of a working power supply; the working power supply is the first power supply or the second power supply; in the case of lightning stroke or sudden rise of grid voltage, the protection unit can suppress the abnormal high voltage, so that the power switching module of the DC screen is prevented from being damaged by the abnormal high voltage, and the other modules of the DC screen are prevented from being faulty due to the abnormal high voltage, thereby reducing the failure rate of the power switching module and the DC screen as a whole; by means of the electric parameter detection unit, the control unit and the relay, it is determined whether the working power supply is faulty according to the electric parameters, and when it is determined that the working power supply is faulty, the working power supply is automatically switched, so that another power supply can be quickly switched for power supply in the case of working power supply fault, the timeliness of power switching is improved, the situation of power loss of the rear load is avoided, and the stability of the power switching module and the DC screen as a whole is improved.

[0068] The embodiment of the application further provides a power switching method of a DC screen, which is applied to the power switching module of the DC screen. Figure 4 As shown in the figure, the power switching method of the DC screen comprises the following steps.

[0069] S401, in the case of outputting abnormal high voltage by the working power supply, the abnormal high voltage is suppressed by the protection unit;

[0070] S402, the electric parameter value corresponding to the working power supply is detected by the electric parameter detection unit and sent to the control unit.

[0071] S403, determining, by the control unit, whether the working power supply has a fault according to the electrical parameter value, and sending a switching signal to the relay in a case where it is determined that the working power supply has a fault;

[0072] S404, switching, by the relay, a switching state of the first end of the relay according to the switching signal, so as to switch the working power supply from the first power supply to the second power supply, or from the second power supply to the first power supply.

[0073] In some embodiments, in a case where the working power supply outputs an abnormally high voltage, the abnormally high voltage is suppressed by the protection unit, including: when the working power supply outputs an abnormally high voltage belonging to a first interval, suppressing, by the first resistor or the second resistor included in the protection unit, the abnormally high voltage belonging to the first interval; and when the working power supply outputs an abnormally high voltage belonging to a second interval, suppressing, by the first transient diode or the second transient diode included in the protection unit, the abnormally high voltage belonging to the second interval.

[0074] The abnormally high voltage belonging to the first interval refers to a voltage greater than a first preset multiple of the rated voltage, and the abnormally high voltage belonging to the second interval refers to a voltage greater than a second preset multiple of the rated voltage.

[0075] The power supply switching method of the DC screen provided by the embodiments of the present application suppresses the abnormally high voltage of the working power supply by the protection unit; in a case where lightning strikes or the grid voltage suddenly rises, the protection unit can suppress the abnormally high voltage, which can avoid damage to the power supply switching module of the DC screen caused by the abnormally high voltage, and avoid the abnormally high voltage from causing faults of other modules of the DC screen, thereby reducing the failure rate of the power supply switching module and the DC screen as a whole; by the electrical parameter detection unit, the control unit and the relay, it is determined whether the working power supply has a fault according to the electrical parameter, and the working power supply is automatically switched in a case where it is determined that the working power supply has a fault, which can quickly switch to another power supply for power supply in a case where the working power supply has a fault, thereby improving the timeliness of power supply switching, avoiding the case where the rear load loses power, and improving the stability of the power supply switching module and the DC screen as a whole.

[0076] It should be understood that, although the steps in the flowcharts discussed above are shown in a sequential order, the steps need not be performed in the order shown. Unless explicitly stated, as long as the steps are performed in the correct order, the order of the steps is not limited. Moreover, at least some of the steps in the flowcharts discussed above can include multiple steps or stages, which need not be performed at the same time, and the order of the steps or stages need not be sequential. The steps or stages can be performed at different times, and can be performed in parallel or alternating with at least some of the steps or stages of other steps.

[0077] The application also provides a computer program product, comprising a computer program, which, when executed by a processor, implements the power switching method of the direct current screen.

[0078] The application also provides a computer readable storage medium, which stores computer execution instructions, and when a processor executes the computer execution instructions, the above-mentioned method is implemented.

[0079] The above-mentioned readable storage medium can be realized by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0080] An exemplary readable storage medium is coupled to the processor, so that the processor can read information from the readable storage medium, and can write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the device.

[0081] The division of units is only a logical functional division, and in actual implementation, there can be another division mode. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0082] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0083] In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0084] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the part of the present application that essentially contributes to the prior art or the part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method of each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0085] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The aforementioned program can be stored in a computer readable storage medium. The program executes the steps of the above-mentioned method embodiments when executed; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, and various media that can store program codes.

[0086] Finally, it should be noted that those skilled in the art, after considering the specification and practicing the disclosed application, will easily think of other embodiments of the present application. The present application is intended to cover any variations, uses or adaptations of the present application that follow the general principles of the present application and include common knowledge or conventional technical means in the art that are not disclosed in the present application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is only limited by the appended claims.

Claims

1. A power switching module for a DC power supply, characterized in that, The power switching module includes: a protection unit, an electrical parameter detection unit, a relay, and a control unit; the first input terminal and the second input terminal of the protection unit are respectively connected to a first power supply and a second power supply; the first output terminal and the second output terminal of the protection unit are connected to the first terminal of the relay; the second terminal of the relay is connected to the charging module of the DC power supply; the control terminal of the relay is connected to the control unit. The protection unit is used to suppress abnormally high voltage of the operating power supply; the operating power supply is a first power supply or a second power supply. The electrical parameter detection unit is used to detect the electrical parameter values ​​corresponding to the working power supply and send them to the control unit; The control unit is configured to send a switching signal to the relay when it is determined that the working power supply is faulty based on the electrical parameter values. The relay is used to switch the switching state of the first terminal according to the switching signal, so as to switch the operating power supply from the first power supply to the second power supply, or from the second power supply to the first power supply.

2. The power switching module according to claim 1, characterized in that, The protection unit includes: a first resistor and a second resistor, a first end of the first resistor being connected to the first power supply, a second end of the first resistor being grounded, and a first end being connected to the relay. The first end of the second resistor is connected to the second power supply, the second end of the second resistor is grounded, and the first end of the relay is connected.

3. The power switching module according to claim 1, characterized in that, The protection unit includes: a first transient suppression diode and a second transient suppression diode; The first terminal of the first transient suppression diode is connected to the second power supply, the second terminal of the first transient suppression diode is grounded, and the first terminal of the relay is connected. The first terminal of the second transient suppression diode is connected to the second power supply, the second terminal of the second transient suppression diode is grounded, and the first terminal of the relay is connected.

4. The power switching module according to claim 1, characterized in that, The power switching module also includes an overvoltage detection unit; The overvoltage detection unit is used to detect the input voltage of the power supply circuit corresponding to the working power supply, and send an overvoltage signal to the control unit when the input voltage is greater than a preset voltage threshold. The control unit is also configured to send a switching signal to the relay based on the overvoltage signal.

5. The power switching module according to claim 1, characterized in that, The electrical parameter detection unit includes a current sensor and a voltage sampler; The current sensor is used to detect the current value corresponding to the working power supply and send it to the control unit; The voltage sampler is used to detect the voltage value corresponding to the working power supply and send it to the control unit; The control unit is further configured to determine that the power supply is faulty when the current value is less than a preset current threshold or the difference between the voltage value and the preset voltage value meets a preset condition, and send a switching signal to the relay.

6. The power switching module according to any one of claims 1 to 5, characterized in that, The power switching module further includes: a communication unit and a voice unit; The control unit is configured to, when it is determined that there is a fault in the power supply, generate fault data of the power supply, determine the voice message corresponding to the fault data, send the fault data to the communication unit, and send the voice message to the voice unit; The communication unit is used to receive the fault data sent by the control unit and send the fault data to the terminal of the DC power supply. The voice unit is used to receive voice messages sent by the control unit, store the voice messages, and play the voice messages; it is also used to receive voice query commands triggered by the user and play the latest stored voice messages according to the voice query commands.

7. A power switching method for a DC power supply, characterized in that, The method, applied to a power switching module for a DC power supply as described in any one of claims 1 to 6, comprises: In the event of an abnormally high voltage output from the power supply, the abnormally high voltage is suppressed by the protection unit. The electrical parameter values ​​corresponding to the working power supply are detected by the electrical parameter detection unit and sent to the control unit; The control unit determines whether the working power supply is faulty based on the electrical parameter values, and sends a switching signal to the relay if the working power supply is faulty. The relay is used to switch the switching state of the first terminal of the relay according to the switching signal, so as to switch the working power supply from the first power supply to the second power supply, or from the second power supply to the first power supply.

8. The method according to claim 7, characterized in that, The method of suppressing the abnormally high voltage through a protection unit when the operating power supply outputs an abnormally high voltage includes: When the working power supply outputs an abnormally high voltage belonging to the first range, the abnormally high voltage belonging to the first range is suppressed by the first resistor or the second resistor included in the protection unit. When the operating power supply outputs an abnormally high voltage within the second range, the abnormally high voltage within the second range is suppressed by the first transient diode or the second transient diode included in the protection unit.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in claim 7 or 8.

10. A computer program product, characterized in that, Includes computer execution instructions, which, when executed by a processor, implement the method as described in claim 7 or 8.

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