A direct current switch control circuit

Abstract

The utility model discloses a kind of direct current switch control circuits, including input terminal CON1, signal processing module, DC-DC module, output terminal and multiple independent switch modules, the input terminal CON1 is used to access input power supply, and output end is electrically connected with the power input end of each switch module, the input end of DC-DC module respectively;The output end of each switch module is electrically connected with the input end of the output terminal one-to-one correspondence respectively, the output terminal is used to connect multiple way LED load, and the output end of switch module respectively outputs corresponding voltage to corresponding LED load.The utility model discloses a kind of direct current switch control circuits, to overcome the defects of slow switching speed, weak anti-interference, insufficient multiway control, imperfect state detection, poor communication interaction in existing direct current switch control scheme.

Description

Technical Field

[0001] This utility model belongs to the field of rail transit electrical control, specifically relating to a DC switch control circuit, which is suitable for controlling the on / off state of multiple LED lights and real-time monitoring of their working status. Background Technology

[0002] In the passenger compartment lighting system of rail transit locomotives, LED lamps operate at low DC voltage (such as DC48V) and have a large operating current. The control system needs to simultaneously realize the independent switching control of multiple LED lamps and perform real-time detection of the operating status of each LED lamp (such as whether it is normally on / off, whether it is short-circuited / overcurrent) and the input power status (such as whether it is overvoltage / undervoltage) to meet the requirements of intelligent control and energy saving.

[0003] Existing control schemes for multi-channel LED lighting have the following shortcomings: 1. The switch control speed is slow and the anti-interference ability is weak. It is easily affected by the complex electromagnetic environment of the locomotive, which may cause LED lights to be falsely triggered or control to be delayed. 2. Lack of multi-channel independent control design makes it difficult to achieve precise control of a single LED lamp, resulting in poor flexibility; 3. The status detection function is incomplete. It can only simply determine whether the light is "on" or "off". It cannot identify problems such as abnormal input power supply (e.g., overvoltage / undervoltage) or switching element failure (e.g., MOSFET open circuit / short circuit), making troubleshooting difficult. 4. The communication and interaction capabilities with the main control system are weak, and the equipment status cannot be fed back in real time, which is not conducive to the intelligent management and energy-saving control of the system.

[0004] Therefore, further improvements will be made to address the aforementioned issues. Utility Model Content

[0005] The main purpose of this utility model is to provide a DC switch control circuit that overcomes the shortcomings of existing DC switch control schemes, such as slow switching speed, weak anti-interference, insufficient multi-channel control, imperfect status detection, and poor communication interaction. It provides a DC switch control circuit with multi-channel independent control, fast switching, multiple protection, real-time detection, and communication functions.

[0006] To achieve the above objectives, this utility model provides a DC switch control circuit, including an input terminal CON1, a signal processing module, a DC-DC module, an output terminal, and multiple independent switch modules, wherein: The input terminal CON1 is used to connect to the input power supply, and the output terminal is electrically connected to the power input terminal of each switching module and the input terminal of the DC-DC module, respectively. The output terminal of each switch module is electrically connected to the input terminal of the output terminal, and the output terminal is used to connect multiple LED loads. The output terminal of each switch module outputs the corresponding voltage to the corresponding LED load. The signal processing module is equipped with multiple ON / OFF control ports, multiple FAULT detection ports, multiple voltage detection ports, an RX communication port, and a TX communication port, wherein: The multiple ON / OFF control ports are electrically connected to the control terminals of multiple switch modules one by one, and are used to output switch control signals to control the opening or closing of the corresponding switch modules; The multiple FAULT detection ports are electrically connected to the fault signal output terminals of multiple switching modules one by one, and the multiple voltage detection ports are electrically connected to the output voltage detection terminals of multiple switching modules one by one. The FAULT detection ports and voltage detection ports are used together to detect the working status and input / output information of the corresponding switching modules. The RX and TX communication ports are used to establish a communication connection with the main control unit. The signal processing module receives the switch control command or status query command from the main control unit through the RX communication port and feeds back the working status information of the switch module through the TX communication port. The output terminal of the DC-DC module is electrically connected to the power input terminal of the signal processing module, and is used to convert the voltage of the input power supply into the power supply voltage required by the signal processing module.

[0007] As a further preferred embodiment of the above technical solution, the signal processing module is also connected to an input power supply through an input voltage detection port.

[0008] As a further preferred embodiment of the above technical solution, the signal processing module includes a processing chip U2. Pin 33 of the processing chip U2 is electrically connected to the TX terminal of the input terminal CON1 through a resistor R11, and the TX terminal is grounded through a capacitor C63. Pin 34 of the processing chip U2 is electrically connected to the RX terminal of the input terminal CON1 through a resistor R10, and the RX terminal is grounded through a capacitor C62.

[0009] As a further preferred embodiment of the above technical solution, the DC-DC module includes a step-down chip U1. The input terminal of the step-down chip U1 is connected to the input power supply through an inductor FB1 and a fuse RF1, and the output terminal of the step-down chip U1 outputs the power supply voltage required by the signal processing module.

[0010] As a further preferred technical solution to the above technical solution, the number of switch modules is 6.

[0011] The beneficial effects of this utility model are as follows: 1. Multi-channel independent control, fast switching speed: It adopts a 6-channel independent switching module, which supports precise control of single-channel LED load, fast switching response speed, strong anti-interference ability, and is suitable for the complex electromagnetic environment of locomotives. 2. Comprehensive protection functions: It realizes input power overvoltage / undervoltage protection and output overcurrent / short circuit protection to avoid circuit damage caused by power supply abnormality or load failure; 3. Comprehensive fault detection: It can detect component faults such as open circuit, short circuit, and restart of switching transistors, as well as abnormal input power supply and lack of load power supply. The fault signals are clear and easy to troubleshoot. 4. Real-time communication and monitoring: It can interact with the main control unit in real time through the RX / TX port, actively report the equipment status, and also support the main control unit to actively query, so as to meet the needs of intelligent control and energy-saving management. 5. Strong load adaptability: The maximum output current of a single-channel switch module is up to 10A, which can drive high-power LED lights and meet the high current requirements of passenger compartment lighting in rail transit. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0013] Figure 2 This is a schematic diagram of the input terminal CON1 of this utility model.

[0014] Figure 3 This is a schematic diagram of the signal processing module of this utility model.

[0015] Figure 4 This is a schematic diagram of the DC-DC module of this utility model.

[0016] Figure 5 This is a schematic diagram of the output terminal of this utility model.

[0017] Figure 6 This is a schematic diagram of the switch 1 of this utility model. Detailed Implementation

[0018] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0019] This utility model discloses a DC switch control circuit. The specific embodiments of the utility model are further described below with reference to preferred embodiments.

[0020] In the embodiments of this utility model, those skilled in the art will note that the main control unit, LED load, etc. involved in this utility model can be regarded as prior art.

[0021] Preferred embodiment.

[0022] like Figure 1 As shown, this utility model discloses a DC switch control circuit, including an input terminal CON1, a signal processing module, a DC-DC module, an output terminal, and multiple independent switch modules, wherein: The input terminal CON1 is used to connect to the input power supply (DC+48V), and the output terminal is electrically connected to the power input terminal of each switching module and the input terminal of the DC-DC module, respectively. Each switch module's output terminal is electrically connected to the input terminal of the output terminal, and the output terminal is used to connect multiple LED loads. The output terminals of the switch modules output corresponding voltages (DC48V+(1) to DC48V+(6)) to the corresponding LED loads. The signal processing module is equipped with multiple ON / OFF control ports (ON / OFF_1 to ON / OFF_6), multiple FAULT detection ports (FAULT_1 to FAULT_6), multiple voltage (48V+_dete) detection ports (48V+dete_1 to 48V+dete_6), an RX communication port, and a TX communication port, wherein: The multiple ON / OFF control ports are electrically connected to the control terminals of multiple switch modules one by one, and are used to output switch control signals to control the opening or closing of the corresponding switch modules; The multiple FAULT detection ports are electrically connected to the fault signal output terminals of multiple switching modules one by one, and the multiple voltage detection ports are electrically connected to the output voltage detection terminals of multiple switching modules one by one. The FAULT detection ports and voltage detection ports are used together to detect the working status and input / output information of the corresponding switching modules. The RX and TX communication ports are used to establish a communication connection with the main control unit. The signal processing module receives the switch control command or status query command from the main control unit through the RX communication port and feeds back the working status information of the switch module through the TX communication port. The output terminal of the DC-DC module is electrically connected to the power input terminal of the signal processing module, and is used to convert the voltage of the input power supply into the power supply voltage (+5V) required by the signal processing module.

[0023] Specifically, the signal processing module is also connected to the input power supply through the input voltage detection port (DC+48V) (detecting the input power supply information and sending it to the main control unit through the TX communication port, while also supporting the main control unit to query the input power supply information in real time).

[0024] like Figure 2-5 As shown, more specifically, the signal processing module includes a processing chip U2. Pin 33 of the processing chip U2 is electrically connected to the TX terminal (pin 31) of the input terminal CON1 through a resistor R11, and the TX terminal is grounded through a capacitor C63. Pin 34 of the processing chip U2 is electrically connected to the RX terminal (pin 15) of the input terminal CON1 through a resistor R10, and the RX terminal is grounded through a capacitor C62.

[0025] Furthermore, the DC-DC module includes a step-down chip U1. The input terminal (pin 3) of the step-down chip U1 is connected to the input power supply through an inductor FB1 and a fuse RF1. The output terminal (pin SW) of the step-down chip U1 outputs the power supply voltage (+5V) required by the signal processing module.

[0026] Furthermore, the number of switch modules is 6, including switches 1 through 6. Let's take switch 1 as an example for a detailed description: like Figure 6 As shown, switch 1 includes switch chip U3. One of the two pins of switch chip U3 is connected to the input power supply DC+48V, and the other pin is connected to the drain of field-effect transistor Q1 through resistor RS1. The gate of field-effect transistor Q1 is connected to the 10th pin of switch chip U3, and the source of field-effect transistor Q1 outputs the corresponding voltage DC48V+(1) to the corresponding LED load.

[0027] The working principle of this utility model is as follows: The input terminals are connected to a DC+48V power supply. The DC+48V is input to switches 1 to 6, and switches 1 to 6 output DC48V+(1) to DC48V+(6), which are connected to 6 LED loads via the output terminals. At the same time, the DC+48V is converted to +5V by the DC-DC module to power the signal processing module. The signal processing module controls the opening and closing of switches 1 to 6 through the ON / OFF_1 to ON / OFF_6 ports. The working status and output information of switches 1 to 6 are detected through the FAULT_1 to FAULT_6 ports and the 48V+dete_1 to 48V+dete_6 ports. The signal processing module controls the opening and closing of each switch through the aforementioned ports and feeds back to the main control unit. Specifically, when the signal processing module receives an open or closed switch signal from the main control unit via the RX communication port, it controls the switch to open or close via the ON / OFF port. Simultaneously, it detects whether the switch is open or closed and whether it is operating normally via the 48V+dete and FAULT ports, and sends this information to the main control unit via the TX communication port. The signal processing module receives query information from the main control unit in real time via the RX communication port and sends the current information of the switch modules it receives to the main control unit via the TX communication port. The signal processing module detects input power information via the DC+48V port and sends it to the main control unit via the TX communication port, while also supporting real-time querying of input power information by the main control unit.

[0028] It is worth mentioning that the technical features such as the main control unit and LED load involved in this utility model patent application should be regarded as prior art. The specific structure, working principle and possible control method and spatial arrangement of these technical features can be adopted by conventional choices in the field and should not be regarded as the inventive point of this utility model patent. This utility model patent will not be further elaborated in detail.

[0029] For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A DC switching control circuit, characterized in that, It includes input terminal CON1, signal processing module, DC-DC module, output terminal and multiple independent switch modules, among which: The input terminal CON1 is used to connect to the input power supply, and the output terminal is electrically connected to the power input terminal of each switching module and the input terminal of the DC-DC module, respectively. The output terminal of each switch module is electrically connected to the input terminal of the output terminal, and the output terminal is used to connect multiple LED loads. The output terminal of each switch module outputs a corresponding voltage to the corresponding LED load. The signal processing module is equipped with multiple ON / OFF control ports, multiple FAULT detection ports, multiple voltage detection ports, an RX communication port, and a TX communication port, wherein: The multiple ON / OFF control ports are electrically connected to the control terminals of multiple switch modules one by one, and are used to output switch control signals to control the opening or closing of the corresponding switch modules; The multiple FAULT detection ports are electrically connected to the fault signal output terminals of multiple switching modules one by one, and the multiple voltage detection ports are electrically connected to the output voltage detection terminals of multiple switching modules one by one. The FAULT detection ports and voltage detection ports are used together to detect the working status and input / output information of the corresponding switching modules. The RX and TX communication ports are used to establish a communication connection with the main control unit. The signal processing module receives the switch control command or status query command from the main control unit through the RX communication port and feeds back the working status information of the switch module through the TX communication port. The output terminal of the DC-DC module is electrically connected to the power input terminal of the signal processing module, and is used to convert the voltage of the input power supply into the power supply voltage required by the signal processing module.

2. The DC switch control circuit according to claim 1, characterized in that, The signal processing module is also connected to an input power supply via an input voltage detection port.

3. The DC switch control circuit according to claim 1, characterized in that, The signal processing module includes a processing chip U2. Pin 33 of the processing chip U2 is electrically connected to the TX terminal of the input terminal CON1 through a resistor R11, and the TX terminal is grounded through a capacitor C63. Pin 34 of the processing chip U2 is electrically connected to the RX terminal of the input terminal CON1 through a resistor R10, and the RX terminal is grounded through a capacitor C62.

4. The DC switch control circuit according to claim 3, characterized in that, The DC-DC module includes a step-down chip U1. The input terminal of the step-down chip U1 is connected to the input power supply through an inductor FB1 and a fuse RF1. The output terminal of the step-down chip U1 outputs the power supply voltage required by the signal processing module.

5. A DC switch control circuit according to claim 4, characterized in that, The number of switch modules is 6.

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