An electrically controlled circuit based on an and gate and a diode

Abstract

The utility model provides a kind of electric control circuit based on and gate and diode, comprising: and gate chip, two emergency stop buttons coupled to and gate chip, the emergency stop button is connected with the and gate chip by two connectors, two the emergency stop button is respectively first emergency stop button and second emergency stop button, the first emergency stop button is normally open button, the second emergency stop button is normally closed button, the first emergency stop button button has one pull-up resistor in series and is connected to the input end of and gate chip, one end of the second emergency stop button is connected to another input end of and gate chip, the other end of the second emergency stop button is connected to reference level, by the combination of and gate circuit and diode circuit, multiple control signals can be as the input of and gate, only one output signal can control the on-off of circuit power supply, to simplify circuit structure, improve reliability.

Description

Technical Field

[0001] This application relates to the field of power line protection technology, and in particular to an electronic control circuit based on AND gates and diodes. Background Technology

[0002] For safety and ease of operation, large equipment is often equipped with multiple emergency stop buttons. Traditional control methods typically involve setting up a separate control circuit for each emergency stop button. This approach has several drawbacks: High circuit complexity: Each additional emergency stop button requires a separate control circuit. These circuits include buttons, connecting wires, current-limiting resistors, filter capacitors, and corresponding logic control chips. For example, in a device with five emergency stop buttons, five similar circuits need to be repeatedly laid out, making the overall circuit layout intricate and significantly increasing the difficulty of circuit design and wiring. Significantly increased costs: As the number of control circuits increases, the number of electronic components required also increases linearly. Each control circuit requires independent buttons, resistors, capacitors, and possibly logic chips, directly leading to increased hardware costs. Simultaneously, the complex circuit layout increases the area required for printed circuit boards (PCBs), further increasing manufacturing costs. Reduced reliability: A large number of electronic components and connection points mean more potential points of failure. For example, buttons in each control circuit may malfunction due to mechanical wear or electrical faults; wire connections are prone to problems such as cold solder joints and broken wires; logic chips may also malfunction due to electromagnetic interference. Once a single emergency stop control circuit fails, the safety protection function of the entire equipment may be affected, increasing the risk of equipment operation. Maintenance is difficult: When equipment malfunctions and requires repair, maintenance personnel must troubleshoot the complex circuit layout. Since each emergency stop button has an independent control circuit, the fault diagnosis process becomes cumbersome and time-consuming. Each component and connection in each circuit needs to be checked individually, increasing the workload and difficulty of maintenance and prolonging equipment downtime. Space is required: The arrangement of multiple independent control circuits requires a significant amount of space. Within a limited equipment cabinet or control panel, the accumulation of numerous circuit boards and components makes the space cramped, hindering heat dissipation and layout optimization, and also limiting further miniaturization and integration of the equipment.

[0003] Therefore, developing an emergency stop control circuit that simplifies circuit structure, reduces cost, improves reliability, and is easy to maintain is of great practical significance in the design and application of large equipment. Utility Model Content

[0004] This utility model provides an electronic control circuit based on AND gates and diodes, which at least solves the problems of high circuit complexity and high cost in related technologies.

[0005] According to one embodiment of the present invention, an electronic control circuit based on AND gates and diodes includes: an AND gate chip and two emergency stop buttons coupled to the AND gate chip. The emergency stop buttons are connected to the AND gate chip through two connectors. The two emergency stop buttons are a first emergency stop button and a second emergency stop button. The first emergency stop button is a normally open button, and the second emergency stop button is a normally closed button. The first emergency stop button is connected in series with a pull-up resistor and connected to one input terminal of the AND gate chip. One end of the second emergency stop button is connected to the other input terminal of the AND gate chip, and the other end of the second emergency stop button is connected to a reference level.

[0006] Furthermore, it also includes an isolator coupled to the two emergency stop buttons and the AND gate chip.

[0007] Furthermore, the isolator selected is an isolator of model CA-IS3720HS.

[0008] Furthermore, the connector used is a KF2EDGV connector.

[0009] Furthermore, the AND gate chip selected is a 74HC08 AND gate chip.

[0010] By combining AND gate circuits and diode circuits, this invention allows multiple control signals to be used as inputs to an AND gate, requiring only one output signal to control the power supply of the circuit, thereby simplifying the circuit structure and improving reliability. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 The overall structural circuit diagram provided for the embodiments of this application.

[0012] In the diagram, U28 is an AND gate chip; EMG1NC1 is the first emergency stop button; EMG1NC2 is the second emergency stop button; CN21 is the first connector; CN22 is the second connector; and U14 is an isolator. Detailed Implementation

[0013] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0014] Example: Refer to Figure 1 As shown, an electronic control circuit based on an AND gate and a diode includes a first emergency stop button EMG1NC1 and a second emergency stop button EMG1NC2. The first emergency stop button EMG1NC1 is a normally open button, and the second emergency stop button EMG1NC2 is a normally closed button. The normally open button is connected in series with a pull-up resistor and then connected to one input of the AND gate. This pull-up resistor is connected to the power supply voltage to ensure that the AND gate input is high when the button is not pressed. One end of the normally closed button is connected to the other input of the AND gate, and the other end is connected to a reference level of 0V. The two emergency stop buttons are respectively connected to the two inputs of the AND gate chip. In this embodiment, a 74HC08 AND gate chip is selected. The anode of diode D1 is connected to the gate of the MOSFET. The diode is configured to prevent reverse current flow and clamp the MOSFET's drive voltage when the AND gate output is low.

[0015] When the normally open button is pressed, its two ends are not conducting and become low level. The normally closed button remains normally closed. The input of the AND gate connected to the normally closed button is still low level. At this time, the output of the AND gate is high level, the gate voltage of the MOSFET becomes high level, and the MOSFET turns on.

[0016] When the normally closed button is pressed, its two ends are disconnected, and the input terminal of the AND gate connected to the normally closed button loses the low-level connection. However, due to the pull-up resistor R1 of the normally open button, the input terminal of the AND gate connected to the normally open button is still at a high level. At this time, the input terminal of the AND gate connected to the normally open button is also at a high level. At this time, the output of the AND gate is at a high level, the gate voltage of the MOSFET becomes high level, and the MOSFET is turned on.

[0017] In this embodiment, the two signal lines MCU_EMG1 and MCU_EMG2 are connected to the 3.3V power supply through resistors R52 and R53, respectively, to provide control signal input to the circuit. The resistors act as current limiters and pull-up resistors to ensure signal stability. Pins A and B of the AND gate chip U28 are the input terminals of the AND gate, connected to the signal lines MCU_EMG1 and MCU_EMG2 of the two emergency stop buttons, respectively. Pin Y is the output terminal of the AND gate, outputting the signal EMG_ALL. Pin 5 is connected to the 3.3V power supply, and pin 4 is connected to ground. This ensures that the output EMG_ALL is high only when neither emergency stop button is pressed (i.e., both input signals are high). When either emergency stop button is pressed, the corresponding input signal becomes low, and the output EMG_ALL becomes low, thus realizing the logic judgment for emergency stop. Pins 1 and 2 of the first connector CN21 are connected to EMG1 and EMG2 respectively, and pin 3 is connected to the normally closed button EMG1NC2. Pins 1 and 2 of the second connector CN22 are connected to EMG1 and EMG2 respectively, and pin 3 is connected to the normally open button EMG1NC1. Capacitors C57 and C168 are connected between the 3.3V power supply and ground respectively, and C167 is connected to the corresponding signal line to stabilize the power supply voltage and reduce noise interference, ensuring stable circuit operation. C167 also has an anti-static protection function to prevent electrostatic damage to the circuit. Pins VDDA and VDDB of isolator U14 are connected to the 3.3V power supply, pins GNDA and GNDB are connected to ground, pins VI1 and VI2 are input terminals, connected to EMG1 and EMG2 respectively, and pins VO1 and VO2 are output terminals, connected to MCU_EMG1' and MCU_EMG2' respectively. Electrical isolation is implemented between the emergency stop signal and the microcontroller to prevent external interference from affecting the microcontroller. Simultaneously, the emergency stop signal is transmitted to the microcontroller, achieving signal isolation and transmission, thus improving system reliability and safety. Specifically, the connector used is model KF2EDGV, and the isolator is model CA-IS3720HS.

[0018] This application combines AND gate circuits and diode circuits, allowing multiple control signals to be used as inputs to the AND gate. Only one output signal is needed to control the power supply of the circuit, thereby simplifying the circuit structure and improving reliability.

[0019] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0020] The terminology used in the embodiments of this application is for the purpose of describing specific embodiments only and is not intended to limit the present invention. The singular forms "a," "the," and "the" used in the embodiments of this application are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that in the description of this application, unless otherwise stated, " / " indicates that the objects before and after are in an "or" relationship; for example, A / B can represent A or B. "And / or" in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be singular or plural.

[0021] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrase “if determination” or “if detection (of the condition or event of the statement)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the condition or event of the statement)” or “in response to detection (of the condition or event of the statement).”

[0022] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that 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. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An electronically controlled circuit based on AND gates and diodes, characterized in that, include: An AND gate chip (U28) and two emergency stop buttons coupled to the AND gate chip (U28) are provided. The emergency stop buttons are connected to the AND gate chip (U28) through two connectors. The two emergency stop buttons are a first emergency stop button (EMG1NC1) and a second emergency stop button (EMG1NC2). The first emergency stop button (EMG1NC1) is a normally open button, and the second emergency stop button (EMG1NC2) is a normally closed button. The first emergency stop button (EMG1NC1) is connected in series with a pull-up resistor and connected to one input terminal of the AND gate chip (U28). One end of the second emergency stop button (EMG1NC2) is connected to the other input terminal of the AND gate chip (U28), and the other end of the second emergency stop button (EMG1NC2) is connected to a reference level.

2. The electronic control circuit based on AND gates and diodes according to claim 1, characterized in that, It also includes an isolator (U14) coupled to the two emergency stop buttons and the AND gate chip (U28).

3. The electronic control circuit based on AND gates and diodes according to claim 2, characterized in that, The isolator (U14) selected is the CA-IS3720HS model isolator (U14).

4. The electronic control circuit based on AND gates and diodes according to claim 1, characterized in that, The connector used is a KF2EDGV connector.

5. The electronic control circuit based on AND gates and diodes according to claim 1, characterized in that, The AND gate chip (U28) used is model 74HC08.

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