A multi-path protection signal control circuit

Abstract

The utility model discloses a kind of multi-path protection signal control circuit, belong to the technical field of automation equipment protection circuit.The circuit is input by several protection sensor signals, and each signal is connected to N channel MOS field effect transistor through input resistance and load resistance, and MOS tube is connected to triode after cascading, and triode output end connects motor driver I O port, and 24V is simultaneously stabilized as 5V for sensor power supply using 78L05.The utility model solves the problem of insufficient motor controller I O port resources, high cost and low reliability in prior art, can be flexibly configured according to sensor type, reduces cost and assembly difficulty, and improves system reliability.

Description

Technical Field

[0001] This utility model relates to the field of protection circuit technology for automated equipment, and specifically to a multi-channel protection signal control circuit. Background Technology

[0002] In the field of automation equipment, when equipment is in operation, if an external protection signal is triggered, the equipment must be stopped immediately. Currently, most equipment uses the method of directly detecting protection signals through the I / O ports of the motor controller, with each signal corresponding to one I / O port. However, this solution has obvious drawbacks: the number of I / O ports of a typical motor controller is limited. When faced with multiple protection signal inputs, insufficient I / O port resources can occur, forcing some input detection ports to share multiple interfaces. This not only complicates wiring but also reduces system reliability.

[0003] Some devices use an additional MCU, connecting signals to the MCU's I / O pins and then controlling the motor controller via communication. However, this approach has several problems: firstly, it increases design costs and system complexity; secondly, if communication is unstable, protection signals may not be transmitted in time, preventing the equipment from stopping promptly and potentially causing injury or equipment damage.

[0004] Therefore, it is of great significance to provide a multi-channel protection signal control circuit to solve the problems existing in the prior art. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a multi-channel protection signal control circuit to solve the problem.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A multi-channel protection signal control circuit, comprising:

[0008] Several protection sensor signal inputs are provided. Each signal input is connected to an input resistor and a load resistor to ground. Each input resistor is connected to an N-channel MOSFET.

[0009] The MOS field-effect transistor is cascaded with the drain of the next MOS field-effect transistor through its source, and the source of the last MOS field-effect transistor is grounded.

[0010] The drain of the first MOS field-effect transistor is connected to the base of the transistor via an output resistor. The output resistor, together with the resistors of the base and emitter of the transistor, forms a bias circuit.

[0011] The collector of the transistor is the output port, which is connected to the I / O port of the multi-channel motor driver.

[0012] The voltage regulator circuit regulates the 24V to 5V to power the sensor.

[0013] Preferably, the protection sensor is a PNP type or an NPN type. When it is a PNP type, the load resistor is a pull-down resistor; when it is an NPN type, the load resistor is a pull-up resistor.

[0014] Preferably, the N-channel MOSFET is a BSS138 model.

[0015] Preferably, the transistor is a PNP type transistor used to implement logic switching function.

[0016] Preferably, the voltage regulator circuit uses a 78L05 voltage regulator to regulate the 24V voltage to 5V.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. It solves the problem of insufficient motor driver I / O port resources in the multi-channel protection sensor signal detection of traditional automated equipment.

[0019] 2. The load resistor can be flexibly configured to be grounded or pulled up according to the sensor type (NPN or PNP), the power supply voltage of the sensor can also be configured, and multiple motor driver outputs can also be configured.

[0020] 3. It reduced costs and assembly difficulty, and improved system reliability.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings.

[0022] The above and other objects, advantages and features of this application will become more apparent to those skilled in the art from the following detailed description of specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0024] Figure 1This is the circuit diagram of this utility model;

[0025] In the diagram: PNP type protection sensors U1, U2, U3, U4; input resistors R1, R3, R5, R7; pull-down resistors R2, R4, R6, R8; N-channel MOSFETs Q1, Q2, Q3, Q4; output resistor R13; bias resistors R14, R15; transistor Q5; collector resistor R16; output interfaces J5, J6, J7; 24V to 5V voltage regulator U1; filter capacitors C1, C2. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. In the following description, specific details such as specific configurations and components are provided merely to help fully understand the embodiments of this application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. In addition, for clarity and brevity, descriptions of known functions and structures are omitted in the embodiments.

[0027] Furthermore, reference numerals and / or letters may be repeated in different examples within this application. Such repetition is for the purpose of simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0028] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another type of relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0029] It should also be noted that, in this document, 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.

[0030] Please see Figure 1This utility model provides a technical solution for a multi-channel protection signal control circuit, including PNP type protection sensors U1, U2, U3, U4, input resistors R1, R3, R5, R7, pull-down resistors R2, R4, R6, R8, N-channel MOSFETs Q1, Q2, Q3, Q4, output resistor R13, bias resistors R14, R15, transistor Q5, collector resistor R16, output interfaces J5, J6, J7, 24V to 5V voltage regulator U1, and filter capacitors C1 and C2.

[0031] U1, U2, U3, and U4 are PNP type protection sensors in this embodiment, but NPN type protection sensors can also be configured according to actual needs. Input resistors R1, R3, R5, and R7 are input current-limiting resistors. Pull-down resistors R2, R4, R6, and R8 are pull-down load resistors configured for PNP type protection sensors; if the sensor is NPN, pull-up resistors are required. Q1, Q2, Q3, and Q4 are N-type MOSFETs, connected to the source and drain of the next stage to form a logic node. Q5 is a PNP type transistor used as a logic switch. U1 regulates the 24V to 5V, and C1 and C2 filter to ensure power supply stability.

[0032] Working principle: Untriggered state: When the PNP type sensor is not triggered, all outputs are high level, Q1, Q2, Q3, and Q4 are all turned on, Q5 base is low level, Q5 is turned on, J5, J6, and J7 are all high level, and the motor driver is running normally;

[0033] Triggering state: When a PNP sensor is triggered, it outputs a low level. Therefore, when any sensor is triggered, the corresponding NMOS transistor is in the off state, which causes the logic node Q1, Q2, Q3, and Q4 to be in the off state as a whole. The base of Q5 is at a high level and is also cut off. Finally, J5, J6, and J7 are all at a low level, triggering the motor driver to stop urgently.

[0034] The above description is merely a preferred embodiment of this utility model and does not limit the scope of protection of this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any changes, modifications, substitutions, integrations, and parameter alterations made to these embodiments within the spirit and principles of this utility model, through conventional substitutions or methods that achieve the same function without departing from the principles and spirit of this utility model, fall within the scope of protection of this utility model.

Claims

1. A multi-channel protection signal control circuit, characterized in that, include: Several protection sensor signal inputs are provided. Each signal input is connected to an input resistor and a load resistor to ground. Each input resistor is connected to an N-channel MOSFET. The MOS field-effect transistor is cascaded with the drain of the next MOS field-effect transistor through its source, and the source of the last MOS field-effect transistor is grounded. The drain of the first MOS field-effect transistor is connected to the base of the transistor via an output resistor. The output resistor, together with the resistors of the base and emitter of the transistor, forms a bias circuit. The collector of the transistor is the output port, which is connected to the I / O port of the multi-channel motor driver. The voltage regulator circuit regulates the 24V to 5V to power the sensor.

2. The multi-channel protection signal control circuit according to claim 1, characterized in that, The protection sensor is of PNP or NPN type. When it is of PNP type, the load resistor is a pull-down resistor; when it is of NPN type, the load resistor is a pull-up resistor.

3. The multi-channel protection signal control circuit according to claim 1, characterized in that, The N-channel MOSFET is model BSS138.

4. The multi-channel protection signal control circuit according to claim 1, characterized in that, The transistor is a PNP type transistor used to implement logic switching functions.

5. The multi-channel protection signal control circuit according to claim 1, characterized in that, The voltage regulator circuit uses a 78L05 voltage regulator to regulate the 24V voltage to 5V.

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