Multi-path intrinsic safety power supply suitable for supplying power to underground vehicle-mounted equipment

Abstract

The invention belongs to the technical field of mining power supply equipment, and relates to a multi-path intrinsic safety power supply suitable for power supply of underground vehicle-mounted equipment, which comprises an input terminal and a plurality of branch circuits, the output end of the delay module is connected with an output terminal, the output terminal is used for intrinsically safe output to supply power to one kind of vehicle-mounted equipment, and the delay module is used for controlling the connection time of the branch circuit, so that the plurality of branch circuits can be sequentially connected from front to back; therefore, each kind of vehicle-mounted equipment can operate stably by matching with isolation formed among the plurality of branches. According to the invention, isolation can be formed among the plurality of branch circuits through the plurality of isolation power supply modules, and the plurality of branch circuits are sequentially connected from front to back through the plurality of delay modules, so that each kind of vehicle-mounted equipment operates stably, and normal operation of other vehicle-mounted equipment is not affected after a fault occurs; and the occupation of the installation space on the mining vehicle is reduced, and the cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of mine power supply equipment and relates to a multi-channel intrinsically safe power supply suitable for powering vehicle-mounted equipment under a mine. Background Art

[0002] With the development of intelligent coal mines, the types of intelligent equipment in mines are increasing day by day. Mining vehicles are also equipped with a variety of on-board equipment to make coal mine operations safer and more efficient, such as communication equipment, monitoring equipment, lighting equipment, etc. Therefore, it is usually necessary to power these on-board equipment.

[0003] At present, when powering multiple onboard devices on mining vehicles, each onboard device is usually equipped with an intrinsically safe power supply to ensure that each onboard device can operate stably and will not affect the normal operation of other onboard devices after a failure. However, due to the limited space of mining vehicles themselves, setting up multiple intrinsically safe power supplies not only takes up more installation space on mining vehicles, but also increases costs. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-channel intrinsically safe power supply suitable for powering vehicle-mounted equipment in mines, which can power multiple vehicle-mounted equipment at the same time through one intrinsically safe power supply, ensure the stable operation of each vehicle-mounted equipment and will not affect the normal operation of other vehicle-mounted equipment after a failure occurs, thereby reducing the occupancy of installation space and reducing costs.

[0005] To achieve the above purpose, the present invention provides a specific technical solution of a multi-channel intrinsically safe power supply suitable for powering underground vehicle equipment as follows:

[0006] A multi-channel intrinsically safe power supply suitable for powering underground vehicle equipment includes an input terminal, the input terminal is used to be electrically connected to the DC output terminal of the battery of the mining vehicle, the input terminal is connected in parallel with multiple branches, each branch includes:

[0007] An isolated power supply module is electrically connected to the input terminal, and the isolated power supply is used to establish isolation between the input and output of the corresponding branch circuit, so that multiple branch circuits are isolated from each other;

[0008] The delay module is electrically connected to the isolation power supply module. The output end of the delay module is connected to an output terminal, which is used for intrinsically safe output to power one of the vehicle-mounted devices. The delay module is used to control the connection time of the branch road so that multiple branch roads can be connected in sequence from front to back, thereby cooperating with the isolation formed between the multiple branch roads to enable each vehicle-mounted device to operate stably.

[0009] The present invention is also characterized in that:

[0010] A battery information detection module is arranged between the input terminal and multiple branch roads, and the battery information detection module is electrically connected to the input terminal and multiple isolation power supply modules respectively. The battery information detection module is used to detect the input voltage and input current in real time, and the battery information detection module is electrically connected to the control module. A load detection module is arranged between the delay module and the output terminal, and the input end of the load detection module is connected to the output end of the delay module, and the output end of the load detection module is connected to the output terminal. The load detection module is used to detect the output voltage of the corresponding branch road and the load current of the corresponding branch road in real time. The load detection module is electrically connected to the control module, and the control module is electrically connected to the display module. The control module is used to receive the input voltage, input current, the output voltage of the corresponding branch road and the load current of the corresponding branch road, and send them to the display module for real-time display.

[0011] A temperature control module is arranged between the isolated power supply module and the battery information detection module. The input end of the temperature control module is connected to the output end of the battery information detection module, and the output end of the temperature control module is connected to the input end of the isolated power supply module. The temperature control module is used to detect the temperature of the corresponding isolated power supply module and cut off the connection with the corresponding isolated power supply module when the temperature exceeds the set value, and close the connection with the corresponding isolated power supply module when the temperature is lower than the set value. The temperature control module is electrically connected to the control module, and the control module is used to compare the received input voltage and input current with the rated parameters. If the input is abnormal, the control module controls the temperature control module to cut off the power supply to each branch.

[0012] An overvoltage and overcurrent protection module is arranged between the isolation power supply module and the delay module. The input end of the overvoltage and overcurrent protection module is connected to the output end of the isolation power supply module, and the output end of the overvoltage and overcurrent protection module is connected to the input end of the delay module. The overvoltage and overcurrent protection module is used to detect the output voltage of the corresponding branch and the load current of the corresponding branch and disconnect the output after exceeding the parameter setting value and restore the output after the fault is eliminated.

[0013] The overvoltage and overcurrent protection module is electrically connected to the control module. The control module compares the received output voltage of the corresponding branch and the load current of the corresponding branch with the rated parameters. If the output of the branch is abnormal, the control module controls the corresponding overvoltage and overcurrent protection module to cut off the power supply of the branch.

[0014] A wireless transmission unit is provided in the control module, and the wireless transmission unit is connected to a service terminal via a wireless transmission network. The service terminal is used to receive input voltage, input current, output voltage of the corresponding branch, and load current of the corresponding branch sent from the control module and send remote control instructions to the control module.

[0015] The number of the branch roads is one of two, three, four, five and six.

[0016] The multi-channel intrinsically safe power supply of the present invention suitable for powering underground vehicle-mounted equipment has the following advantages:

[0017] First, by using multiple parallel branch roads and each branch road including an isolation power supply module and a delay module, multiple branch roads can be isolated through multiple isolation power supply modules, and multiple branch roads can be connected in sequence from front to back through multiple delay modules, thereby ensuring that each type of on-board equipment operates stably and will not affect the normal operation of other on-board equipment after a fault occurs, reducing the installation space occupied on the mining vehicle and reducing costs.

[0018] Second, through the cooperation of the battery information detection module, multiple load detection modules, the control module and the display module, the input voltage, input current, output voltage of each line and load current of each line can be displayed in real time through the display module, thereby facilitating real-time monitoring of multiple branch lines and ensuring the stable operation of each type of vehicle-mounted equipment.

[0019] Second, through the cooperation of the control module, multiple temperature control modules and multiple overvoltage and overcurrent protection modules, multiple branch roads can operate independently, thereby forming isolation between multiple branch roads, further ensuring that each type of vehicle-mounted equipment operates stably and will not affect the normal operation of other vehicle-mounted equipment after a fault occurs.

[0020] Fourth, through the cooperation of the control module, wireless transmission network and service terminal, the battery information and the load information of each branch road can be remotely collected, which is convenient for clearly understanding the specific conditions of the battery and each branch road, so as to facilitate remote control in case of emergencies, thereby further ensuring the stable operation of each vehicle-mounted equipment and not affecting the normal operation of other vehicle-mounted equipment after a failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a system block diagram of the present invention;

[0022] Figure 2 This is a system block diagram of each branch path of the present invention. DETAILED DESCRIPTION

[0023] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, such as A and / or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two. The following terms "first" and "second" are used for descriptive purposes only and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0024] like Figure 1 , Figure 2 As shown, the present invention provides a multi-channel intrinsically safe power supply suitable for powering vehicle-mounted equipment in mines, including an input terminal, the input terminal is a DC input, the input terminal is used to be electrically connected to the DC output end of the battery of the mining vehicle, the input terminal is connected to multiple branch roads in parallel, each branch road includes an isolation power supply module and a delay module, the isolation power supply module is electrically connected to the input terminal, the isolation power supply is used to establish isolation between the input and output of the corresponding branch road, so that isolation is formed between the multiple branch roads, the delay module is electrically connected to the isolation power supply module, the output end of the delay module is connected to the output terminal, the output terminal is used for intrinsically safe output to power one of the vehicle-mounted equipment, the delay module is used to control the connection time of the branch road, so that the multiple branch roads can be connected in sequence from front to back, so that when powering multiple vehicle-mounted equipment, it can be done from front to back in sequence, avoiding battery overload operation, and cooperating with the isolation between the multiple branch roads to enable each vehicle-mounted equipment to operate stably, so that one of the vehicle-mounted equipment will not affect the normal operation of other vehicle-mounted equipment after a failure, reducing the occupation of the installation space on the mining vehicle and reducing the cost.

[0025] like Figure 1As shown, a battery information detection module is arranged between the input terminal and the multiple branch roads, and the battery information detection module is electrically connected to the input terminal and the multiple isolation power modules respectively, and the battery information detection module is used to detect the input voltage and the input current in real time, and the battery information detection module is electrically connected to the control module, and a load detection module is arranged between the delay module and the output terminal, and the input end of the load detection module is connected to the output end of the delay module, and the output end of the load detection module is connected to the output terminal, and the load detection module is used to detect the output voltage of the corresponding branch road and the load current of the corresponding branch road in real time, and the load detection module is electrically connected to the control module, and the control module is electrically connected to the display module, and the control module is used to receive the output voltage of the branch road corresponding to the input voltage and the input current and the load current of the corresponding branch road, and send them to the display module for real-time display, and through the real-time display of the input voltage, the input current, the corresponding output voltage and the corresponding load current, it is convenient to monitor the multiple branch roads in real time to ensure the stable operation of each vehicle-mounted equipment.

[0026] like Figure 1 As shown, a temperature control module is arranged between the isolated power supply module and the battery information detection module, the input end of the temperature control module is connected to the output end of the battery information detection module, and the output end of the temperature control module is connected to the input end of the isolated power supply module. The temperature control module is used to detect the temperature of the corresponding isolated power supply module and cut off the connection with the corresponding isolated power supply module when the temperature exceeds the set value, and close the connection with the corresponding isolated power supply module when the temperature is lower than the set value, so that each branch is isolated from the input, and further isolates multiple branches.

[0027] like Figure 1 As shown, the temperature control module is electrically connected to the control module, and the control module is used to compare the received input voltage and input current with the rated parameters. If the input is abnormal, the control module controls the temperature control module to cut off the power supply to each branch, and further controls the input and each branch to avoid affecting each branch after a problem with the battery.

[0028] like Figure 1 As shown, an overvoltage and overcurrent protection module is provided between the isolation power module and the delay module, the input end of the overvoltage and overcurrent protection module is connected to the output end of the isolation power module, the output end of the overvoltage and overcurrent protection module is connected to the input end of the delay module, and the overvoltage and overcurrent protection module is used to detect the output voltage of the corresponding branch and the load current of the corresponding branch, and disconnect the output after exceeding the parameter setting value, and restore the output after the fault is eliminated, so that each branch can be controlled and protected separately, thereby further isolating multiple branches. As a result, each vehicle-mounted device can operate stably and will not affect the normal operation of other vehicle-mounted devices after a fault occurs.

[0029] like Figure 1As shown, the overvoltage and overcurrent protection module is electrically connected to the control module. The control module compares the received output voltage of the corresponding branch and the load current of the corresponding branch with the rated parameters. If the output of the branch is abnormal, the control module controls the corresponding overvoltage and overcurrent protection module to cut off the power supply of the branch, and further controls each branch to prevent the problem of the branch from affecting other branches, thereby further enabling multiple branches to operate independently.

[0030] like Figure 1 As shown, a wireless transmission unit is provided in the control module, and the wireless transmission unit is connected to a service terminal via a wireless transmission network. The service terminal is used to receive the input voltage, input current, output voltage of the corresponding branch road, and load current of the corresponding branch road sent from the control module and send remote control instructions to the control module. By remotely collecting the battery information and the load information of each branch road, it is convenient to clearly understand the specific conditions of the battery and each branch road, so as to facilitate remote control in case of emergencies, thereby further ensuring the stable operation of each vehicle-mounted equipment and not affecting the normal operation of other vehicle-mounted equipment after a failure occurs.

[0031] like Figure 1 As shown, each isolated power supply module is a DC-DC isolated power supply, each delay module is a delay circuit, the control module is an ESP32 control circuit, the battery information detection module is a battery information detection circuit, each load detection module is a load detection circuit, each temperature control module is a temperature control switch, each overvoltage and overcurrent protection module is an overvoltage and overcurrent protection circuit, and the display module is a display screen.

[0032] Specifically, the model of each DC-DC isolated power supply is preferably HKD30-24S12WM, which uses a flyback topology and is composed of a control chip, a transformer, a switch tube, and a Schottky diode. It supports 9-36V input and has an output power of 30W. Since the transformer, switch tube, and Schottky diode generate the highest heat during operation, a metal shell is used outside the module, and these three high-heat-generating devices are placed close to the metal shell of the isolated power module for heat dissipation. In order to ensure the service life of the isolated power module, the shell of the isolated power module is connected to the shell of the intrinsically safe power supply through a thermally conductive copper block and a silicone thermal pad, and heat dissipation teeth are added to the shell of the intrinsically safe power supply as an optional accessory to prevent the power supply equipment from heating up seriously under long-term operation under high load conditions, thereby affecting the life of internal components.

[0033] The delay circuit is composed of the high temperature resistant SE555 timer chip and its peripheral circuits.

[0034] The model of the ESP32 control circuit is preferably ESP32-WROOM-32UE-H8, which is mainly composed of an ESP32 module, an isolation chip and peripheral circuits.

[0035] The battery information detection circuit consists of an INA180A1 current sensing amplifier, a voltage sampling amplifier, and other peripheral circuits. It is used to detect the voltage and current of the battery input and transmit the collected information to the ESP32 control chip.

[0036] The load detection circuit uses an ACPL-C790-500E isolation amplifier, isolation optocouplers and other devices and their peripheral circuits to correspond to the output voltage and load current at the load end of the branch line, and transmit the collected information to the ESP32 control circuit.

[0037] Each temperature control module uses two 85℃ temperature control switches as over-temperature protection devices. Since the location with the highest heat generation in the entire circuit is on the DC-DC isolated power module, the two temperature control switches are placed close to the power module housing. When the temperature exceeds 85℃, the temperature control switch will directly cut off the power supply to the DC-DC isolated power module, and the battery will not output to the outside. When the temperature drops below 65℃, the temperature control switch will automatically close and resume external power supply, that is, the set value is 65℃~85℃.

[0038] The overvoltage and overcurrent detection circuit is composed of a high-temperature resistant LT4363HMS-2#TRPBF surge protector, a fast-switching MOS tube KIA4603AE, and peripheral circuits such as sampling resistors. As a key component of the intrinsically safe power supply, when the surge protector detects that the output voltage or output current exceeds the set value of the intrinsically safe parameter, it will shut down the switch tube output, and automatically restore the switch tube output after the fault is eliminated.

[0039] like Figure 1 As shown, multiple delay modules are electrically connected to the control module respectively, and the control module is used to control the multiple delay modules to start in sequence from front to back. The delay circuit has two control modes. One is that after the ESP32 receives the server timing or determines through the load detection circuit that the load device has started, it controls the next switch tube to turn on. When the ESP32 delay fails, the timer chip is used for delay. This part of the circuit is mainly used to avoid the simultaneous startup of 6 load devices, resulting in excessive startup instantaneous current and damage to the battery of the mining vehicle. Two control modes are set to avoid the failure of ESP32 timing control.

[0040] like Figure 1As shown, there are six branches, namely, a six-branch intrinsically safe power supply is formed to supply power to six types of vehicle-mounted equipment at the same time. Due to the limitation of the installation space of mining vehicles, the setting of the six-branch intrinsically safe power supply makes the volume of the intrinsically safe power supply occupy the maximum proportion of the installation space of the mining vehicle, thus avoiding excessive occupation of the installation space on the mining vehicle.

[0041] Working principle: After the mining vehicle is powered on, the intrinsically safe power supply of the six branches is used to power the on-board camera, base station, mobile phone, tablet and other equipment at the same time to maintain the normal operation of the equipment. The six branches are isolated through six DC-DC isolation power supplies, and the six branches are connected in sequence from front to back at intervals of three seconds in six delay circuits. The battery information detection circuit detects the input voltage and input current in real time and sends them to the ESP32 control circuit. Each load detection circuit detects the output voltage and load current of the corresponding branch in real time and sends them to the ESP32 control circuit. The ESP32 control circuit sends the input voltage, input current, output voltage of each branch and load current of each branch to the display screen for real-time display. At the same time, the control module compares the received input voltage, input current, output voltage of each branch and load current of each branch with the rated parameters. If the input or output of one of the branches is abnormal, a control command is sent to the control module. The control module cuts off the battery power supply of the branch by controlling the corresponding temperature control module and cuts off the power supply of the branch by controlling the corresponding overvoltage and overcurrent protection module.

[0042] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A multi-channel intrinsically safe power supply suitable for powering underground vehicle equipment, comprising an input terminal, the input terminal being used to electrically connect to a DC output terminal of a battery of a mining vehicle, characterized in that: The input terminal is connected in parallel with a plurality of branch paths, each of which comprises: An isolated power supply module is electrically connected to the input terminal, and the isolated power supply is used to establish isolation between the input and output of the corresponding branch circuit, so that multiple branch circuits are isolated from each other; The delay module is electrically connected to the isolation power supply module. The output end of the delay module is connected to an output terminal, which is used for intrinsically safe output to power one of the vehicle-mounted devices. The delay module is used to control the connection time of the branch road so that multiple branch roads can be connected in sequence from front to back, thereby cooperating with the isolation formed between the multiple branch roads to enable each vehicle-mounted device to operate stably.

2. The multi-channel intrinsically safe power supply suitable for powering underground vehicle-mounted equipment according to claim 1 is characterized in that: A battery information detection module is arranged between the input terminal and the multiple branch roads, and the battery information detection module is electrically connected to the input terminal and the multiple isolated power supply modules respectively. The battery information detection module is used to detect the input voltage and input current in real time, and the battery information detection module is electrically connected to the control module. A load detection module is arranged between the delay module and the output terminal, and the input end of the load detection module is connected to the output end of the delay module, and the output end of the load detection module is connected to the output terminal. The load detection module is used to detect the output voltage of the corresponding branch road and the load current of the corresponding branch road in real time. The load detection module is electrically connected to the control module, and the control module is electrically connected to the display module. The control module is used to receive the input voltage, input current, the output voltage of the corresponding branch road and the load current of the corresponding branch road, and send them to the display module for real-time display.

3. The multi-channel intrinsically safe power supply suitable for powering underground vehicle-mounted equipment according to claim 2 is characterized in that: A temperature control module is arranged between the isolated power supply module and the battery information detection module, the input end of the temperature control module is connected to the output end of the battery information detection module, the output end of the temperature control module is connected to the input end of the isolated power supply module, the temperature control module is used to detect the temperature of the corresponding isolated power supply module and cut off the connection with the corresponding isolated power supply module when the temperature exceeds the set value, and close the connection with the corresponding isolated power supply module when the temperature is lower than the set value, the temperature control module is electrically connected to the control module, and the control module is used to compare the received input voltage and input current with the rated parameters. If the input is abnormal, the control module controls the temperature control module to cut off the power supply to each branch.

4. The multi-channel intrinsically safe power supply suitable for powering underground vehicle-mounted equipment according to claim 2 is characterized in that: An overvoltage and overcurrent protection module is arranged between the isolation power supply module and the delay module. The input end of the overvoltage and overcurrent protection module is connected to the output end of the isolation power supply module, and the output end of the overvoltage and overcurrent protection module is connected to the input end of the delay module. The overvoltage and overcurrent protection module is used to detect the output voltage of the corresponding branch and the load current of the corresponding branch and disconnect the output after exceeding the parameter setting value and restore the output after the fault is eliminated.

5. The multi-channel intrinsically safe power supply suitable for powering underground vehicle-mounted equipment according to claim 4 is characterized in that: The overvoltage and overcurrent protection module is electrically connected to the control module. The control module compares the received output voltage of the corresponding branch and the load current of the corresponding branch with the rated parameters. If the output of the branch is abnormal, the control module controls the corresponding overvoltage and overcurrent protection module to cut off the power supply of the branch.

6. The multi-channel intrinsically safe power supply suitable for powering underground vehicle-mounted equipment according to claim 2 is characterized in that: A wireless transmission unit is provided in the control module, and the wireless transmission unit is connected to a service terminal via a wireless transmission network. The service terminal is used to receive input voltage, input current, output voltage of the corresponding branch, and load current of the corresponding branch sent from the control module and send remote control instructions to the control module.

7. The multi-channel intrinsically safe power supply suitable for powering underground vehicle-mounted equipment according to claim 1 is characterized in that: The number of the branch roads is one of two, three, four, five and six.

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