A power detection device and display terminal

Abstract

This utility model discloses a power detection device and a display terminal. A power supply switch module and a power detection module are connected between a power supply device and a power receiving device. The power supply device supplies power to the power receiving device through the power supply switch module and the power detection module. The power detection module detects the target power when the power supply device supplies power to the power receiving device. When the controller determines that the target power exceeds a preset power threshold, it promptly controls the power supply switch module to shut off, thus disconnecting the power supply path from the power supply device to the power receiving device. Therefore, in this application, during the process of the power supply device supplying power to the power receiving device, the power detection module maintains the detection of the target power received by the power receiving device, while the controller controls the power supply switch module to supply power when the target power exceeds the preset power threshold, i.e., the target power exceeds the power that the power receiving device can withstand, thereby protecting the power receiving device.

Description

Technical Field

[0001] This utility model relates to the field of circuit protection, and in particular to a power detection device and a display terminal. Background Technology

[0002] If the power supply equipment outputs too much power when supplying power to the receiving equipment, it will cause the receiving equipment to be damaged by overvoltage. Therefore, how to avoid the power supply equipment outputting too much power from affecting the normal operation of the receiving equipment is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0003] The purpose of this utility model is to provide a power detection device and a display terminal. During the process of power supply equipment supplying power to the powered equipment, the power detection module keeps detecting the target power received by the powered equipment, and the controller controls the power supply switch module to supply power when the target power is greater than the preset power threshold, that is, when the target power exceeds the power that the powered equipment can withstand, so as to protect the powered equipment.

[0004] To solve the above-mentioned technical problems, this utility model provides a power detection device, including a power supply switch module, a power detection module, and a controller;

[0005] The first end of the power supply switch module is connected to the power supply output end of the power supply equipment, and the second end of the power supply switch module is connected to the first end of the power detection module;

[0006] The second end of the power detection module is connected to the power input end of the powered device, and is used to detect the target power transmitted from the power supply device to the powered device.

[0007] The input terminal of the controller is connected to the output terminal of the power detection module, and the output terminal of the controller is connected to the control terminal of the power supply switch module, which is used to control the power supply switch module to turn off when the target power is greater than a preset power threshold.

[0008] Preferably, the power detection module includes a current detection module and a voltage detection module;

[0009] The first end of the current detection module is connected to the second end of the power supply switch module, the second end of the current detection module is connected to the power supply input end of the power receiving device, and the output end of the current detection module is connected to the first input end of the controller, for collecting the power supply current received by the power receiving device;

[0010] The second input terminal of the voltage detection module is connected to the power supply input terminal of the powered device, and the output terminal of the voltage detection module is connected to the input terminal of the controller, for collecting the power supply voltage received by the powered device;

[0011] The target power is the product of the supply current and the supply voltage.

[0012] Preferably, the current detection module includes a first sampling resistor and a current acquisition unit;

[0013] The first end of the first sampling resistor is connected to the second end of the power supply switch module, and the second end of the first sampling resistor is connected to the power supply input terminal of the powered device.

[0014] The first input terminal of the current acquisition unit is connected to the first terminal of the first sampling resistor, the second input terminal of the current acquisition unit is connected to the second terminal of the first sampling resistor, and the output terminal of the current acquisition unit is connected to the first input terminal of the controller. The current acquisition unit is used to acquire the voltage across the first sampling resistor and convert it into the power supply current based on the resistance value of the first sampling resistor.

[0015] Preferably, it also includes a thermistor and a voltage divider resistor;

[0016] The thermistor is disposed next to the first sampling resistor, and the distance between the thermistor and the first sampling resistor is less than a preset distance;

[0017] The first end of the thermistor is connected to the power supply, the second end of the thermistor is connected to the first end of the voltage divider resistor, the second end of the voltage divider resistor is grounded, and the second end of the thermistor is connected to the compensation input terminal of the controller, so that the controller determines the current to be compensated based on the voltage of the second end of the thermistor and compensates the power supply current based on the current to be compensated.

[0018] Preferably, it also includes a power management chip;

[0019] The input terminal of the power management chip is connected to the power output terminal of the power supply device, the output terminal of the power management chip is connected to the first terminal of the power supply switch module, and the control terminal of the power management chip is connected to the voltage regulation output terminal of the controller. It is used to convert the output voltage of the power supply device and output the power supply voltage. When the controller determines that the power supply current is not greater than a preset current threshold, but the power supply voltage is greater than a preset voltage threshold, the power supply voltage is reduced based on the control of the controller.

[0020] Preferably, the current detection module includes a current transformer, a second sampling resistor, and an amplifier;

[0021] The first end of the primary coil of the current transformer is connected to the second end of the power supply switch module, the second end of the primary coil of the current transformer is connected to the power supply input terminal of the power receiving device, the first end of the secondary coil of the current transformer is connected to the first end of the second sampling resistor, and the second end of the secondary coil of the current transformer is connected to the second end of the second sampling resistor.

[0022] The first input terminal of the amplifier is connected to the first terminal of the second sampling resistor, the second input terminal of the amplifier is connected to the second terminal of the second sampling resistor, and the output terminal of the amplifier is connected to the second input terminal of the controller. The amplifier is used to amplify the voltage across the second sampling resistor to generate an equivalent voltage, which is then transmitted to the controller so that the controller can determine the supply current based on the equivalent voltage.

[0023] Preferably, it also includes a power detection motherboard;

[0024] The input terminal of the power detection motherboard is connected to the target power output terminal of the controller, and is used to store the target power received by the powered device as output by the controller.

[0025] Preferably, the power supply output terminal of the power supply device is a first network interface, and the power supply input terminal of the power receiving device is a second network interface; both the first network interface and the second network interface have PoE functionality; the trigger output terminal of the controller is connected to the control terminal of the power detection module; the power detection device further includes:

[0026] The switch has an input terminal connected to the second network interface, a first output terminal connected to the first network interface, and a second output terminal connected to the trigger terminal of the controller. It is used to provide a first network signal transmission path for the power supply equipment and the powered equipment, and to provide a second network signal transmission path for the controller and the powered equipment, so that the controller can control the power detection module to start when it receives the network signal output by the powered equipment.

[0027] Preferably, it also includes a network signal conversion module;

[0028] The input terminal of the network signal conversion module is connected to the second output terminal of the switch, and the output terminal of the network signal conversion module is connected to the trigger terminal of the controller, for transmitting the network signal output by the powered device to the controller after signal conversion processing.

[0029] To solve the above-mentioned technical problems, this utility model provides a display terminal, including the power detection device as described above.

[0030] This application provides a power detection device and a display terminal. A power supply switch module and a power detection module are connected between a power supply device and a power receiving device. The power supply device supplies power to the power receiving device through the power supply switch module and the power detection module. The power detection module detects the target power when the power supply device supplies power to the power receiving device. When the controller determines that the target power exceeds a preset power threshold, it promptly controls the power supply switch module to shut off, thereby disconnecting the power supply path from the power supply device to the power receiving device. Therefore, in this application, during the process of the power supply device supplying power to the power receiving device, the power detection module maintains the detection of the target power received by the power receiving device. The controller controls the power supply switch module to supply power when the target power exceeds the preset power threshold, i.e., when the target power exceeds the power that the power receiving device can withstand, thus protecting the power receiving device. Attached Figure Description

[0031] To more clearly illustrate the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This application provides a schematic diagram of the structure of a power detection device;

[0033] Figure 2 This is a schematic diagram of the specific structure of a power detection device provided in this application. Detailed Implementation

[0034] The core of this utility model is to provide a power detection device and a display terminal. During the process of the power supply equipment supplying power to the power receiving equipment, the power detection module keeps detecting the target power received by the power receiving equipment. When the target power is greater than the preset power threshold, that is, when the target power exceeds the power that the power receiving equipment can withstand, the controller controls the power supply switch module to supply power to protect the power receiving equipment.

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] Please refer to Figure 1 , Figure 1A schematic diagram of a power detection device provided in this application includes a power supply switch module 1, a power detection module 2, and a controller 3;

[0037] The first end of the power supply switch module 1 is connected to the power output end of the power supply equipment, and the second end of the power supply switch module 1 is connected to the first end of the power detection module 2.

[0038] The second end of the power detection module 2 is connected to the power input end of the power receiving device, and is used to detect the target power transmitted from the power supply device to the power receiving device.

[0039] The input terminal of controller 3 is connected to the output terminal of power detection module 2, and the output terminal of controller 3 is connected to the control terminal of power supply switch module 1, which is used to control power supply switch module 1 to turn off when the target power is greater than the preset power threshold.

[0040] When power supply equipment supplies power to receiving equipment, if the output power of the power supply equipment is too high and the supply voltage is significantly higher than the rated input voltage of the receiving equipment, it will cause overvoltage damage to the receiving equipment. For example, the internal structures of transistors, integrated circuit chips, diodes and other components in the receiving equipment may be broken down by excessive voltage, resulting in permanent damage. Overvoltage can also cause the electrolyte inside the electrolytic capacitors of the receiving equipment to boil and increase the pressure, eventually leading to capacitor bulging, leakage or even explosion. Even ceramic capacitors may experience dielectric breakdown. In addition, sensors, displays, logic circuits and other components may fail due to exceeding their withstand voltage limit. In extreme cases, excessive voltage may also cause electric arcs inside the receiving equipment or between connection points, resulting in physical ablation and short circuits. Even if the power supply voltage is within the rated range, excessive current flowing through the internal resistance of the receiving equipment can cause a sharp increase in heat. Resistors, transistors, voltage regulators, transformers, connectors, etc., can be damaged by overheating, manifesting as burning, melting, performance degradation, or permanent open / short circuits. Insulation materials on wires, transformer windings, and circuit boards may melt due to high temperatures, leading to short circuits or fire risks. Excessive current can cause solder joints on the PCB (Printed Circuit Board) to overheat and melt, resulting in connection failure. Sustained overheating will accelerate component aging and shorten equipment lifespan, even if there is no immediate damage. Furthermore, if the power supply equipment can provide current far exceeding the design capacity of the receiving equipment, when an accidental short circuit occurs inside the receiving equipment, the power supply equipment cannot effectively limit the current. The huge short-circuit current will flow instantly through the short-circuit point, causing the wires, PCB copper foil, components, etc., along the short-circuit path to overheat, melt, catch fire, or even explode. Therefore, this application detects the output power of the power supply equipment when it supplies power to the receiving equipment, so as to avoid the output power of the power supply equipment being too high and affecting the normal operation of the receiving equipment.

[0041] Specifically, in this application, a power supply switch module 1 is provided between the power supply equipment and the power receiving equipment. When the power supply switch module 1 is turned on, the power supply module supplies power to the power receiving module. During the process of the power supply module supplying power to the power receiving module, the power detection module 2 detects the target power output from the power supply equipment to the power receiving equipment and transmits it to the controller 3. The controller 3 judges the target power. When the target power is greater than the preset power threshold, the controller 3 turns off the power supply switch module 1 to disconnect the circuit between the power supply equipment and the power receiving equipment, so that the power supply equipment stops supplying power to the power receiving equipment, thereby avoiding the high power output of the power supply equipment from affecting the normal operation of the power receiving equipment.

[0042] The preset power threshold can be set according to the rated power that the powered equipment can withstand during normal operation to ensure the normal operation of the powered equipment. Of course, this application does not limit this, and it can also be set to be less than the rated power of the powered equipment to provide a certain power redundancy.

[0043] The power supply switch module 1 can be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or a relay, and this application does not limit its use. The power supply switch module can remain closed by default. When the controller 3 detects that the target power exceeds a preset power threshold, it controls the power supply switch module 1 to turn off. After maintenance of the power supply or receiving equipment, the power supply switch module 1 can be turned on again, specifically by the controller 3, and this application does not limit its use. Alternatively, the power supply switch module 1 can remain off by default and be turned on when the controller 1 is powered on or receives a power detection command, or it can be manually turned on by the user, and this application does not limit its use.

[0044] In summary, during the process of the power supply equipment supplying power to the power receiving equipment, the power detection module 2 keeps detecting the target power received by the power receiving equipment, while the controller 3 controls the power supply switch module 1 to supply power when the target power is greater than the preset power threshold, that is, when the target power exceeds the power that the power receiving equipment can withstand, so as to protect the power receiving equipment.

[0045] Based on the above embodiments:

[0046] Figure 2 This is a schematic diagram of the specific structure of a power detection device provided in this application.

[0047] In a preferred embodiment, the power detection module 2 includes a current detection module 21 and a voltage detection module 22;

[0048] The first end of the current detection module 21 is connected to the second end of the power supply switch module 1, the second end of the current detection module 21 is connected to the power supply input end of the powered device, and the output end of the current detection module 21 is connected to the first input end of the controller 3, for collecting the power supply current received by the powered device;

[0049] The input terminal of the voltage detection module 22 is connected to the power supply input terminal of the powered device, and the output terminal of the voltage detection module 22 is connected to the second input terminal of the controller 3, which is used to collect the power supply voltage received by the powered device.

[0050] The target power is the product of the supply current and the supply voltage.

[0051] The power detection module 2 specifically includes a current detection module 21 and a voltage detection module 22. The current detection module 21 is connected in series between the power supply switch module 1 and the powered device. When the power supply switch module 1 is turned on, the power supply device supplies power to the powered device. The current flowing through the current detection module 21 is the power supply current transmitted from the power supply device to the powered device. Therefore, the current detection module 21 can detect the power supply current received by the powered device and transmit it to the controller 3.

[0052] The voltage detection module 22 is connected to the power input terminal of the powered device, detects the power supply voltage received by the powered device, and transmits it to the controller 3.

[0053] The target power is the product of the supply current and the supply voltage. Based on this, after receiving the supply current and supply voltage of the powered device, the controller 3 can determine the target power based on the supply current and supply voltage, thereby determining whether the target power is greater than the preset power threshold.

[0054] Specifically, preset current threshold and preset voltage threshold can be set according to preset power threshold. When the power supply current received by the powered device is greater than the preset power supply current, in order to protect the powered device, the controller 3 can turn off the power supply switch module 1. That is, regardless of whether the power supply voltage is greater than the preset voltage threshold, as long as the power supply current is greater than the preset current threshold, the power supply switch module 1 will be turned off to stop the power supply device from supplying power to the powered device and protect the powered device.

[0055] The grounding terminal of the voltage detection module 22 can be connected to the grounding terminal of the powered device to accurately determine the power supply voltage received by the powered device.

[0056] In a preferred embodiment, the current detection module 21 includes a first sampling resistor 211 and a current acquisition unit 212;

[0057] The first end of the first sampling resistor 211 is connected to the second end of the power supply switch module 1, and the second end of the first sampling resistor 211 is connected to the power supply input terminal of the powered device.

[0058] The first input terminal of the current acquisition unit 212 is connected to the first terminal of the first sampling resistor 211, the second input terminal of the current acquisition unit 212 is connected to the second terminal of the first sampling resistor 211, and the output terminal of the current acquisition unit 212 is connected to the first input terminal of the controller 3. It is used to acquire the voltage across the first sampling resistor 211 and convert it into a power supply current based on the resistance value of the first sampling resistor 211.

[0059] The current detection power supply may include a first sampling resistor 211 and a current acquisition unit 212. The first sampling resistor 211 is connected in series between the power supply switch module 1 and the powered device. The current in the first sampling resistor 211 is the power supply current. The current acquisition unit 212 is connected in parallel across the first sampling resistor 211. It can detect the voltage across the first sampling resistor 211 and then convert it into the power supply current by combining the resistance value of the first sampling resistor 211. The power supply current is the product of the voltage across the first sampling resistor 211 and the resistance value of the first sampling resistor 211.

[0060] As a preferred embodiment, it also includes a thermistor and a voltage divider resistor;

[0061] The thermistor is placed next to the first sampling resistor 211, and the distance between the thermistor and the first sampling resistor 211 is less than a preset distance;

[0062] The first end of the thermistor is connected to the power supply, the second end of the thermistor is connected to the first end of the voltage divider resistor, the second end of the voltage divider resistor is grounded, and the second end of the thermistor is connected to the compensation input terminal of the controller 3, so that the controller 3 can determine the current to be compensated based on the voltage of the second end of the thermistor and compensate the power supply current based on the current to be compensated.

[0063] Since the first sampling resistor 211 has a temperature coefficient, when the temperature in the working environment rises, current sampling drift may occur due to the temperature rise, meaning that the sampled supply current will deviate from the actual supply current. Therefore, in this embodiment, a thermistor is also provided next to the first sampling resistor 211. The resistance of the thermistor changes with temperature; therefore, the resistance of the thermistor can reflect the temperature of the working environment of the first sampling resistor 211. The distance between the thermistor and the first sampling resistor 211 can be less than 1 mm but greater than 0 to avoid the thermistor affecting the normal operation of the first sampling resistor 211. This application does not impose any limitations on this. The thermistor divides the voltage with a voltage divider resistor. When the resistance of the thermistor changes with temperature, the voltage across the thermistor also changes accordingly. Based on this, the voltage at the second terminal of the thermistor is negatively correlated with the resistance of the thermistor. That is, the larger the resistance of the thermistor, the larger the voltage across the thermistor, and the smaller the voltage at the second terminal of the thermistor. The controller 3 can determine the resistance of the thermistor based on the voltage at the second terminal of the thermistor, and then determine the temperature of the thermistor and the first sampling resistor 211 in the working environment. Combining the correspondence between temperature and compensation current, the current to be compensated is determined, and the power supply current is compensated based on the current to be compensated, thereby reducing the error of the power supply current caused by temperature drift and improving the accuracy of power detection.

[0064] The corresponding relationship between temperature and compensation current can be as follows: 0mA for 25 degrees Celsius, +12mA for 45 degrees Celsius, +28mA for 65 degrees Celsius, and +47mA for 85 degrees Celsius. Of course, this application does not impose any limitations on this.

[0065] It should be noted that the error caused by temperature changes in the voltage divider resistor is small and can be ignored.

[0066] In a preferred embodiment, a power management chip 4 is also included;

[0067] The input terminal of the power management chip 4 is connected to the power output terminal of the power supply equipment, the output terminal of the power management chip 4 is connected to the first terminal of the power supply switch module 1, and the control terminal of the power management chip 4 is connected to the voltage regulation output terminal of the controller 3. It is used to convert the output voltage of the power supply equipment and output the power supply voltage. When the controller 3 determines that the power supply current is not greater than the preset current threshold, but the power supply voltage is greater than the preset voltage threshold, the power supply voltage is reduced based on the control of the controller 3.

[0068] In this embodiment, a power management chip 4 can also be set between the power supply device and the power supply switch module 1. The power management chip 4 performs voltage conversion on the output voltage of the power supply device to output the power supply voltage. That is, the power supply voltage received by the powered device is directly output by the power management chip 4, rather than directly output by the power supply device. Based on this, the controller 3 can control the output power supply voltage of the power management chip 4 to decrease when the power supply current is not greater than the preset current threshold, but the power supply voltage is greater than the preset voltage threshold. At this time, the target power may not be greater than the preset power threshold. Compared with directly controlling the power supply switch module 1 to turn off, it can not only avoid the large power supply voltage from affecting the normal operation of the powered device, but also ensure the uninterrupted operation of the powered device.

[0069] It should be noted that the power management chip 4 may include a voltage conversion circuit, such as a DC / DC (Direct Current to Direct Current Converter) unit or a BOOST circuit, to convert the output voltage of the power supply device. Of course, this application does not limit this. The control terminal of the power management chip 4 is the FB terminal of the BOOST circuit.

[0070] In a preferred embodiment, the current detection module 21 includes a current transformer, a second sampling resistor, and an amplifier;

[0071] The first end of the primary coil of the current transformer is connected to the second end of the power supply switch module, the second end of the primary coil of the current transformer is connected to the power supply input terminal of the power receiving equipment, the first end of the secondary coil of the current transformer is connected to the first end of the second sampling resistor, and the second end of the secondary coil of the current transformer is connected to the second end of the second sampling resistor.

[0072] The first input terminal of the amplifier is connected to the first terminal of the second sampling resistor, the second input terminal of the amplifier is connected to the second terminal of the second sampling resistor, and the output terminal of the amplifier is connected to the second input terminal of the controller 3. The amplifier is used to amplify the voltage across the second sampling resistor and generate an equivalent voltage, which is then transmitted to the controller 3 so that the controller 3 can determine the supply current based on the equivalent voltage.

[0073] The current detection module 21 may include a current transformer. The primary coil of the current transformer is connected in series between the power supply switch module 1 and the powered device to sense the power supply current received by the powered device. The primary coil transmits the power supply current to the secondary coil. A second sampling resistor is connected in parallel across the secondary coil. Therefore, the current in the second sampling resistor is the current in the secondary coil. The voltage between the first and second input terminals of the amplifier is the voltage across the second sampling resistor. The amplifier amplifies the voltage across the second sampling resistor to obtain the corresponding equivalent voltage, which is then transmitted to the controller 3. The controller 3 can then deduce the power supply current based on the equivalent voltage. Specifically, the controller 3 first derives the voltage across the second sampling resistor based on the equivalent voltage and the amplifier gain. Then, it calculates the current in the second sampling resistor, which is the current in the secondary coil of the current transformer, based on the resistance value of the second sampling resistor and Ohm's law. Finally, it determines the current in the primary coil, i.e., the power supply current, based on the turns ratio between the primary and secondary coils of the current transformer. Based on this, not only can the controller 3 determine the supply current, but the primary and secondary coils of the current transformer can also isolate the circuit between the powered device and the controller 3, thus avoiding the large supply current from affecting the normal operation of the controller 3.

[0074] In a preferred embodiment, a power detection motherboard 5 is also included;

[0075] The input terminal of the power detection motherboard 5 is connected to the target power output terminal of the controller 3, and is used to store the target power received by the powered device output by the controller 3.

[0076] In this embodiment, a power detection motherboard 5 can also be set to store the target power received by the powered device, thereby determining the power supply voltage received by the powered device during operation, so as to determine the working status of the powered device and further ensure the normal operation of the powered device.

[0077] It should be noted that the power detection motherboard 5 can reuse the control motherboard or memory in the power supply equipment to reduce costs, and this application does not limit this.

[0078] In a preferred embodiment, a display module 6 is also included;

[0079] The input terminal of the display module 6 is connected to the output terminal of the power detection motherboard 5, and is used to receive the target power and display it.

[0080] The display module 6 can receive all target power data stored on the power detection motherboard 5 during the operation of the powered device, including the supply voltage and supply current. This allows staff to view the operation of the powered device and determine its health status based on experience, enabling them to perform maintenance on the device in advance.

[0081] It should be noted that when the power supply device is a display, the display module 6 can use the display screen to display the target power in order to reduce costs, but this application does not limit this.

[0082] In a preferred embodiment, controller 3 is an MCU (Micro Control Unit).

[0083] The controller 3 can be implemented through an MCU, but is not limited to it. The MCU has strong data processing capabilities and can determine the target power, supply voltage and supply current, as well as control the power supply switch module 1 to ensure the normal operation of the powered equipment.

[0084] Of course, the controller 3 may also include a first comparator and a second comparator. The output terminal of the current detection module 21 is connected to the positive input terminal of the first comparator, and converts the detected supply current into a voltage signal and transmits it to the positive input terminal of the first comparator. The negative input terminal of the first comparator is connected to a voltage comparison threshold corresponding to a preset current threshold. The output terminal of the first comparator is connected to the control terminal of the power supply switch module 1. When the voltage at the positive input terminal of the first comparator is greater than the voltage at the negative input terminal, it outputs a high level to turn off the power supply switch module 1. The output terminal of the voltage detection module 22 is connected to the positive input terminal of the second comparator, and transmits the supply voltage to the positive input terminal of the second comparator. The negative input terminal of the second comparator is connected to a preset voltage threshold, and the output terminal of the second comparator is connected to the control terminal of the power management chip 4. When the voltage at the positive input terminal of the second comparator is greater than the voltage at the negative input terminal, the output is high to reduce the supply voltage output by the power management chip 4. If the product of the supply voltage and the supply current is less than the preset power threshold, the power management chip 4 can maintain the adjusted supply voltage output. However, if the target power is still greater than the preset power threshold after the supply voltage output by the power management chip 4 is reduced, the power supply switch module 1 is turned off.

[0085] In a preferred embodiment, the power supply output terminal of the power supply equipment is a first network interface, and the power supply input terminal of the powered equipment is a second network interface. Both the first and second network interfaces have PoE (Power over Ethernet) functionality. The trigger output terminal of the controller 3 is connected to the control terminal of the power detection module 2. The power detection device further includes:

[0086] The switch has an input terminal connected to a second network interface, a first output terminal connected to a first network interface, and a second output terminal connected to a trigger terminal of the controller. It is used to provide a first network signal transmission path for the power supply equipment and the powered equipment, and to provide a second network signal transmission path for the controller 3 and the powered equipment, so that the controller 3 can control the power detection module 2 to start when it receives the network signal output by the powered equipment.

[0087] The power output terminal of the power supply device can be the first network interface, and the power input terminal of the powered device can be the second network interface. Both the first and second network interfaces can have PoE functionality, meaning that both the power supply device and the powered device are PoE-enabled devices. For example, if the power supply device is a PoE-enabled monitor and the powered device is a PoE-enabled router, then the power input terminal of the powered device can both transmit network signals and receive power from the monitor. A PoE-enabled powered device can be powered on and operated without the need for an additional power interface.

[0088] Alternatively, if the power supply is a network video recorder with PoE capability and the power receiving device is an IP camera with PoE capability, then the network video recorder and the IP camera can not only transmit video signals through the network signal transmission path, but the network video recorder can also supply power to the IP camera, thereby reducing the need for power lines and lowering costs.

[0089] Based on this, a switch can be installed between the power supply equipment and the powered equipment. The switch not only provides a network signal transmission path between the power supply equipment and the powered equipment for network signal interaction, but also provides a network signal transmission path between the controller 3 and the powered equipment. When the controller 3 receives a network signal transmitted by the powered equipment, it can determine that the powered equipment is powered on. At this time, the controller 3 can activate the power detection module 2 to detect the power received by the powered equipment. If the power detection device is integrated into the power supply equipment, when the controller 3 receives a network signal output by the powered equipment, it can determine that the first network interface of the power supply equipment and the second network interface of the powered equipment are connected, and the power supply equipment has started supplying power to the powered equipment, thus activating the power detection module 2 to start detecting the power between the power supply equipment and the powered equipment. If the power detection device is integrated into the powered equipment, when the controller 3 receives a network signal output by the powered equipment, it can determine that the second network interface of the powered equipment has received power and is powered on, thus activating the power detection module 2 to start detecting the power received by the powered equipment. It should be noted that the controller 3 can be configured with an independent power supply. When the controller 3 is powered on, it can turn on the power supply switch module 1 so that the power supply equipment can supply power to the power receiving equipment through the power supply switch module 1 and the power detection module 2. At this time, although the power detection module 2 has not yet been started, the power detection module 2 is also in the conducting state, so that power can be transmitted between the power supply equipment and the power receiving equipment. It's just that the power detection module 2 is not performing power detection at this time.

[0090] Based on this, when the powered device is not powered on, the power detection module 2 is in a shutdown state. The power detection module 2 is only started when the controller 3 receives the network signal output by the powered device, thus controlling the power consumption of the power detection module 2.

[0091] In addition, the power supply equipment in this application can also be used for devices that are not equipped with POE functionality. When the power supply equipment is connected to the power detection device in this application, it can also supply power to devices that have POE functionality.

[0092] In a preferred embodiment, a network signal conversion module 7 is also included;

[0093] The input terminal of the network signal conversion module 7 is connected to the second output terminal of the switch of the powered device, and the output terminal of the network signal conversion module 7 is connected to the trigger terminal of the controller 3, so that the controller 3 can process the network signal output by the powered device and transmit it to the controller 3.

[0094] To ensure that the processor can process the network signals output by the powered device, a network signal conversion module 7 can be set up for the controller 3 to convert the network signals into signals that the controller 3 can recognize. For example, if the first output of the switch and the second network interface of the powered device are connected through a LAN (Local Area Network), the network signal conversion module 7 can be a PHY (Physical Layer) that can convert the network signals on the LAN into GMII (Gigabit Media Independent Interface) signals. In this way, the controller 3 can choose a lower-cost MCU, reducing the MCU's requirement for network signals.

[0095] The display terminal in this application includes the power detection device as described above.

[0096] In this embodiment, the display terminal can be either a power supply device or a power receiving device. When the display terminal is used as a power supply device, its power output terminal or its power input terminal as a power receiving device can be a network interface with PoE functionality. Regardless of whether the display terminal is used as a power supply device or a power receiving device, it can integrate the aforementioned power detection device to perform power detection and prevent the power receiving device from receiving excessive target power and causing damage.

[0097] For a description of the display terminal provided by this utility model, please refer to the above embodiments; this utility model will not be described again here.

[0098] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0099] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power detection device, characterized by, Includes a power supply switch module, a power detection module, and a controller; The first end of the power supply switch module is connected to the power supply output end of the power supply equipment, and the second end of the power supply switch module is connected to the first end of the power detection module; The second end of the power detection module is connected to the power input end of the powered device, and is used to detect the target power transmitted from the power supply device to the powered device. The input terminal of the controller is connected to the output terminal of the power detection module, and the output terminal of the controller is connected to the control terminal of the power supply switch module, which is used to control the power supply switch module to turn off when the target power is greater than a preset power threshold.

2. The power detection device of claim 1, wherein, The power detection module includes a current detection module and a voltage detection module; The first end of the current detection module is connected to the second end of the power supply switch module, the second end of the current detection module is connected to the power supply input end of the power receiving device, and the output end of the current detection module is connected to the first input end of the controller, for collecting the power supply current received by the power receiving device; The input terminal of the voltage detection module is connected to the power supply input terminal of the powered device, and the output terminal of the voltage detection module is connected to the second input terminal of the controller, for collecting the power supply voltage received by the powered device; The target power is the product of the supply current and the supply voltage.

3. The power detection device of claim 2, wherein, The current detection module includes a first sampling resistor and a current acquisition unit; The first end of the first sampling resistor is connected to the second end of the power supply switch module, and the second end of the first sampling resistor is connected to the power supply input terminal of the powered device. The first input terminal of the current acquisition unit is connected to the first terminal of the first sampling resistor, the second input terminal of the current acquisition unit is connected to the second terminal of the first sampling resistor, and the output terminal of the current acquisition unit is connected to the first input terminal of the controller. The current acquisition unit is used to acquire the voltage across the first sampling resistor and convert it into the power supply current based on the resistance value of the first sampling resistor.

4. The power detection device of claim 3, wherein, It also includes thermistors and voltage divider resistors; The thermistor is disposed next to the first sampling resistor, and the distance between the thermistor and the first sampling resistor is less than a preset distance; The first end of the thermistor is connected to the power supply, the second end of the thermistor is connected to the first end of the voltage divider resistor, the second end of the voltage divider resistor is grounded, and the second end of the thermistor is connected to the compensation input terminal of the controller, so that the controller determines the current to be compensated based on the voltage of the second end of the thermistor and compensates the power supply current based on the current to be compensated.

5. The power detection device of claim 2, wherein, It also includes power management chips; The input terminal of the power management chip is connected to the power output terminal of the power supply device, the output terminal of the power management chip is connected to the first terminal of the power supply switch module, and the control terminal of the power management chip is connected to the voltage regulation output terminal of the controller. It is used to convert the output voltage of the power supply device and output the power supply voltage. When the controller determines that the power supply current is not greater than a preset current threshold, but the power supply voltage is greater than a preset voltage threshold, the power supply voltage is reduced based on the control of the controller.

6. The power detection device of claim 2, wherein, The current detection module includes a current transformer, a second sampling resistor, and an amplifier; The first end of the primary coil of the current transformer is connected to the second end of the power supply switch module, the second end of the primary coil of the current transformer is connected to the power supply input terminal of the power receiving device, the first end of the secondary coil of the current transformer is connected to the first end of the second sampling resistor, and the second end of the secondary coil of the current transformer is connected to the second end of the second sampling resistor. The first input terminal of the amplifier is connected to the first terminal of the second sampling resistor, the second input terminal of the amplifier is connected to the second terminal of the second sampling resistor, and the output terminal of the amplifier is connected to the second input terminal of the controller. The amplifier is used to amplify the voltage across the second sampling resistor to generate an equivalent voltage, which is then transmitted to the controller so that the controller can determine the supply current based on the equivalent voltage.

7. The power detection device of claim 1, wherein, It also includes a power detection motherboard; The input terminal of the power detection motherboard is connected to the target power output terminal of the controller, and is used to store the target power received by the powered device as output by the controller.

8. The power detection device of any one of claims 1-7, wherein, The power supply output terminal of the power supply equipment is a first network interface, and the power supply input terminal of the power receiving equipment is a second network interface. Both the first network interface and the second network interface have PoE functionality. The trigger output terminal of the controller is connected to the control terminal of the power detection module. The power detection device further includes: The switch has an input terminal connected to the second network interface, a first output terminal connected to the first network interface, and a second output terminal connected to the trigger terminal of the controller. It is used to provide a first network signal transmission path for the power supply equipment and the powered equipment, and to provide a second network signal transmission path for the controller and the powered equipment, so that the controller can control the power detection module to start when it receives the network signal output by the powered equipment.

9. The power detection device of claim 8, wherein, It also includes a network signal conversion module; The input terminal of the network signal conversion module is connected to the second output terminal of the switch, and the output terminal of the network signal conversion module is connected to the trigger terminal of the controller, for transmitting the network signal output by the powered device to the controller after signal conversion processing.

10. A display terminal, characterized by Includes the power detection device as described in any one of claims 1-9.

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