Circuit for simulating power-on button power-on function
By simulating the power-on button power-on function, the circuit composed of power supply monitoring, RC delay circuit and MOS tube is used to solve the problem of inconvenient operation of the IPC unit in the CNC device, and the rapid power-on self-starting without mechanical switches is achieved, meeting the timing requirements of the motherboard processor.
Patent Information
- Application Number
- CN202422123752.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-30
AI Technical Summary
When the IPC unit of the CNC device is used inside the cabinet, the mechanical switch keys are inconvenient to operate and are susceptible to electromagnetic interference, resulting in false triggering and wear, making it difficult to meet the startup timing requirements of the motherboard processor chip.
Design a circuit that simulates the power-on button power-on function, and uses a circuit composed of power-on monitoring circuit, RC delay circuit and MOS tube to realize power-on self-start and output a power-on trigger signal that meets the timing requirements, without the need for mechanical switch buttons.
It realizes rapid power-on without human operation, avoids the use of mechanical switches, improves the user experience, and ensures that the motherboard processor is powered up normally.
Smart Images
Figure CN223067084U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of industrial automation, and particularly relates to a circuit for simulating the power-on button startup function. Background Art
[0002] A numerical control device usually consists of an HMI (Human Machine Interface) unit, an IPC (Industrial Personal Computer) unit, an MCP (Machine Control Panel) unit and a switching power supply. The IPC unit is installed on the back of the HMI unit. After the numerical control device is installed, the IPC unit is placed inside the cabinet. When the main board processor chip used requires an external button trigger signal, if a mechanical button is placed on the controller, it will be very inconvenient for users to operate. It can only be connected to the mechanical switch button through a lead and placed on the front panel. However, the operating environment of the numerical control device has strong electromagnetic interference. The long lead is interfered by the spatial electromagnetic radiation, which may cause the button to be accidentally triggered, and in severe cases, it may cause component damage. In addition, the mechanical switch has a slow action speed and relatively serious contact wear, and needs to be maintained regularly.
[0003] Therefore, in this application scenario, it is required that the IPC unit can start up automatically. When the main board processor chip used has requirements for the power-on timing of the startup trigger signal, it is necessary to design a circuit for simulating the power-on button startup function to meet the requirements of the numerical control system. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a circuit for simulating the power-on button startup function, which can realize power-on self-startup, eliminate the need for external mechanical switch buttons, reduce manual operation, realize fast startup, solve the problem of inconvenient user operation caused by using mechanical switch buttons when the controller of the numerical control device is placed inside the cabinet, and improve the user experience. The specific technical solutions are as follows:
[0005] A circuit for simulating the power-on button startup function includes a power supply monitoring circuit, an RC delay circuit, a first MOS transistor and a second MOS transistor. The output end of the power supply monitoring circuit is connected to the input end of the RC delay circuit and the input end of the second MOS transistor. The output end of the RC delay circuit is connected to the input end of the first MOS transistor. The output end of the first MOS transistor is connected to the input end of the second MOS transistor;
[0006] The power supply monitoring circuit is used for receiving a level signal indicating the power supply and outputting a signal to the RC delay circuit and the second MOS transistor;
[0007] The RC delay circuit is used to delay an input signal with a given time constant and provide a corresponding output signal to the first MOS transistor;
[0008] The first MOS transistor is used to jointly control the second MOS transistor with the power supply monitoring circuit;
[0009] The second MOS transistor is used to output a power-on trigger signal, and the low-level duration of the power-on trigger signal meets the power-on timing requirements of the motherboard processor, ensuring that the motherboard can be powered on and started normally.
[0010] Further, the power supply monitoring circuit includes a power supply monitoring chip and a first resistor. The input pin of the power supply monitoring chip is connected to the PG signal through a second resistor. The output pin of the power supply monitoring chip is connected to the input end of the RC delay circuit and one end of the first resistor, and the other end of the first resistor is grounded.
[0011] Further, the power supply monitoring chip is a low-level effective reset chip.
[0012] Further, the RC delay circuit includes a third resistor, a capacitor, and a diode. One end of the third resistor is connected to the output pin of the power supply monitoring chip, and the other end is connected to one end of the capacitor and the gate of the first MOS transistor. The other end of the capacitor is grounded. The diode is connected in parallel with the third resistor. The positive electrode of the diode is connected to the capacitor, and the negative electrode of the diode is connected to the output pin of the power supply monitoring chip.
[0013] Further, the gate of the first MOS transistor is connected to the output end of the RC delay circuit. The drain of the first MOS transistor is connected to the output pin of the power supply monitoring chip through a fourth resistor, and the source of the first MOS transistor is grounded.
[0014] Further, the gate of the second MOS transistor is connected to the output pin of the power supply monitoring chip through a fourth resistor. The gate of the second MOS transistor is also connected to the drain of the first MOS transistor. The source of the second MOS transistor is grounded. The drain of the second MOS transistor is connected to the PWRBTN signal through a fifth resistor.
[0015] Further, the diode is a Schottky diode.
[0016] Further, both the first MOS transistor and the second MOS transistor are N-channel MOS transistors.
[0017] A circuit for simulating the power-on button startup function provided by the present invention has the following beneficial effects compared with the prior art:
[0018] A circuit for simulating the power-on button startup function provided by the present utility model can simulate the power-on button startup function when the mainboard processor chip of an industrial computer requires a startup trigger signal to meet certain timing requirements, realizing power-on self-startup. There is no need to place a mechanical switch button externally, which can reduce manual operation and avoid the problem of product lifespan caused by the use of mechanical switches. It solves the problem of inconvenient user operation caused by using mechanical switch buttons when the controller of a numerical control device is placed inside a cabinet, improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 is a schematic structural diagram of a circuit for simulating the power-on button startup function provided by the present utility model;
[0020] Figure 2 is a schematic connection diagram of a circuit for simulating the power-on button startup function provided by the present utility model;
[0021] Figure 3 is a signal timing diagram of the circuit for simulating the power-on button startup function provided in an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings provided by the present utility model. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model.
[0023] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connection" and "connection" should be interpreted in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0024] In the description of the present utility model, the orientation or positional relationships such as "upper", "lower", "left", "right", "front", "rear", "center", "horizontal", "vertical", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.
[0025] Embodiment
[0026] Refer toFigure 1 As shown in the figure, the utility model provides a circuit for simulating the power-on button power-on function. The circuit includes a power supply monitoring circuit, an RC delay circuit, a first MOS transistor Q1 and a second MOS transistor Q2. The output end of the power supply monitoring circuit is connected to the input end of the RC delay circuit and the input end of the second MOS transistor Q2. The output end of the RC delay circuit is connected to the input end of the first MOS transistor Q1. The output end of the first MOS transistor Q1 is connected to the input end of the second MOS transistor Q2. Among them, the power supply monitoring circuit is used to receive the level signal indicating the power supply and output the level signal to the RC delay circuit and the second MOS transistor Q2; the RC delay circuit is used to delay the input level signal under a given time constant and output the corresponding level signal to the first MOS transistor Q1; the first MOS transistor Q1 is used to jointly control the second MOS transistor Q2 with the power supply monitoring circuit; the second MOS transistor is used to output a power-on trigger signal, and the low-level duration of the output power-on trigger signal meets the power-on timing requirements of the industrial computer motherboard processor, ensuring that the motherboard can be powered on and started normally.
[0027] The circuit for simulating the power-on button power-on function provided by the utility model can simulate the power-on button power-on function, realize power-on self-starting, and does not require an external mechanical switch button, which can reduce manual operation and avoid the problem of product life caused by the use of mechanical switches. In particular, it solves the problem of inconvenient user operation caused by the use of mechanical switch buttons when the controller of the numerical control device is placed inside the cabinet, improving the user experience.
[0028] The following is a specific description of the circuit for simulating the power-on button power-on function.
[0029] As a specific implementation manner of the power supply monitoring circuit, the power supply monitoring circuit includes a power supply monitoring chip U1 and a resistor R1. The MR input pin of the power supply monitoring chip U1 is connected to the PG (Power good) signal through a resistor R2 for inputting the level signal indicating the power supply. The RESET output pin of the power supply monitoring chip U1 is connected to the input end of the RC delay circuit and one end of the resistor R1. The other end of the resistor R1 is grounded. The resistor R1 is used for pull-down processing to ensure the effectiveness of the low level of the output signal of the power supply monitoring chip U1. When the input level signal is a low-level signal, a low-level signal is output. When the input level signal is a high-level signal, the output signal maintains a low level for a period of time and then changes from low level to high level.
[0030] Optionally, the power supply monitoring chip U1 is a low-level effective reset chip. After the PG signal of the MR input pin of the reset chip is pulled high, the RESET output pin remains low for t1 time and then is pulled high to meet the delay requirements of the PG signal and the PWRBTN signal.
[0031] As a specific implementation of the RC delay circuit, the RC delay circuit includes a resistor R3, a capacitor C1, and a diode D1. One end of the resistor R3 is connected to the RESET output pin of the power supply monitoring chip U1, and the other end is connected to the gate of the first MOS transistor Q1 and one end of the capacitor C1. The other end of the capacitor C1 is grounded. The diode D1 is connected in parallel with the resistor R3. The positive electrode of the diode D1 is connected to the capacitor C1, and the negative electrode of the diode D1 is connected to the RESET output pin of the power supply monitoring chip U1. After the numerical control system is powered off, the diode D1 can accelerate the discharge of the charge in the capacitor C1.
[0032] Optionally, the diode D1 is a Schottky diode.
[0033] Optionally, in order to meet the requirement of the mainboard processor chip of the industrial control computer for the low-level time of the PWRBTN power-on trigger signal, the parameters of the resistor R3 and the capacitor C1 can be adjusted to adjust the time constant of the RC delay circuit, so as to adjust the low-level time of the PWRBTN power-on trigger signal.
[0034] As a specific implementation of the first MOS transistor Q1 and the second MOS transistor Q2, the gate of the first MOS transistor Q1 is connected to the output end of the RC delay circuit. The drain of the first MOS transistor Q1 and the gate of the second MOS transistor Q2 are connected to the output pin of the power supply monitoring chip U1 through a resistor R4. The source of the first MOS transistor Q1 and the source of the second MOS transistor Q2 are both grounded. The drain of the second MOS transistor Q2 is connected to the PWRBTN (Power button) signal through a resistor R5. The output of the first MOS transistor Q1 and the output of the power supply monitoring circuit jointly control the switch of the second MOS transistor Q2, and the second MOS transistor Q2 outputs a power-on trigger signal. Among them, the resistor R4 is used to drive the conduction or cut-off of the second MOS transistor Q2, and after the RC charging is completed and the first MOS transistor Q1 is turned on, it will be directly connected to the ground. The resistance value of the resistor R4 cannot be too small, otherwise the current borne by the resistor R4 will be too large and it will be damaged by heat.
[0035] Optionally, both the first MOS transistor Q1 and the second MOS transistor Q2 are N-channel MOS transistors, and the gate turn-on voltage of the MOS transistor meets the required level range.
[0036] The working principle of the above circuit for simulating the power-on button power-on function is as follows:
[0037] When the input signal of the power supply monitoring circuit is low level and the output of the power supply monitoring circuit is low level, at this time, the voltage difference between the gate and the source of the first MOS transistor Q1 is less than the MOS transistor conduction voltage threshold Vth, the first MOS transistor Q1 is not turned on, the voltage difference between the gate and the source of the second MOS transistor Q2 is less than the MOS transistor conduction voltage threshold Vth, the second MOS transistor Q2 is not turned on, and the power-on trigger signal is pulled up to the power supply and is at a high level.
[0038] When the input signal of the power supply monitoring circuit changes from low level to high level, refer to Figure 3 As shown, the output signal maintains a low level for a time t1, then changes from low level to high level. The input of the RC delay circuit becomes high level, and the RC starts to charge. The output is still low level. At this time, the voltage difference between the gate and the source of the first MOS transistor Q1 is less than the MOS transistor conduction voltage threshold Vth, and the first MOS transistor Q1 is not turned on. The gate of the second MOS transistor Q2 changes from low level to high level, and the voltage difference from the source is greater than the MOS transistor conduction voltage threshold Vth. The second MOS transistor Q2 is turned on, and the drain and the source are turned on. The power-on trigger signal is connected to the ground, becomes low level and maintains for a period of time; after the RC charging is completed, the output of the RC delay circuit changes from low level to high level. At this time, the voltage difference between the gate and the source of the first MOS transistor Q1 is greater than the MOS transistor conduction voltage threshold Vth, and the first MOS transistor Q1 is turned on. The drain of the first MOS transistor Q1 is connected to the gate voltage of the second MOS transistor Q2. The gate of the second MOS transistor Q2 becomes low level, and the voltage difference between the gate and the source is less than the MOS transistor conduction voltage threshold Vth. The second MOS transistor Q2 is not turned on, and the drain and the source are not turned on. The power-on trigger signal is pulled up to the power supply and becomes high level. After the PG signal is pulled high, the PWRBTN power-on trigger signal maintains a low level for t2 and then is pulled high, realizing the function of simulating the power-on button to turn on the machine.
[0039] Those skilled in the art of the present technology should understand that the present utility model can be implemented in many other specific forms without departing from the spirit and scope of the present utility model. Based on the embodiments in the present utility model, any changes and modifications made by those of ordinary skill in the art of the present utility model according to the above disclosure are within the protection scope of the claims.
Claims
1. A circuit for simulating the power-on button startup function, characterized in that: It includes a power supply monitoring circuit, an RC delay circuit, a first MOS transistor, and a second MOS transistor. The output terminal of the power supply monitoring circuit is connected to the input terminal of the RC delay circuit and the input terminal of the second MOS transistor. The output terminal of the RC delay circuit is connected to the input terminal of the first MOS transistor. The output terminal of the first MOS transistor is connected to the input terminal of the second MOS transistor; The power supply monitoring circuit is used to receive a level signal indicating the power supply and output a signal to the RC delay circuit and the second MOS transistor; The RC delay circuit is used to perform delay processing on the input signal under a given time constant and provide a corresponding output signal to the first MOS transistor; The first MOS transistor is used to jointly control the second MOS transistor with the power supply monitoring circuit; The second MOS transistor is used to output a power-on trigger signal. The low-level duration of the power-on trigger signal meets the power-on timing requirements of the motherboard processor, ensuring that the motherboard can be powered on and started normally.
2. The circuit for simulating the power-on button power-on function according to claim 1, wherein: The power supply monitoring circuit includes a power supply monitoring chip and a first resistor. The input pin of the power supply monitoring chip is connected to the PG signal through a second resistor. The output pin of the power supply monitoring chip is connected to the input terminal of the RC delay circuit and one end of the first resistor. The other end of the first resistor is grounded.
3. The circuit for simulating the power-on button power-on function according to claim 2, wherein: The power supply monitoring chip is a low-level effective reset chip.
4. The circuit for simulating the power-on button power-on function according to claim 2, wherein: The RC delay circuit includes a third resistor, a capacitor, and a diode. One end of the third resistor is connected to the output pin of the power supply monitoring chip, and the other end is connected to one end of the capacitor and the gate of the first MOS transistor. The other end of the capacitor is grounded. The diode is connected in parallel with the third resistor. The positive electrode of the diode is connected to the capacitor, and the negative electrode of the diode is connected to the output pin of the power supply monitoring chip.
5. The circuit for simulating the power-on button startup function according to claim 4, characterized in that: The gate of the first MOS transistor is connected to the output terminal of the RC delay circuit. The drain of the first MOS transistor is connected to the output pin of the power supply monitoring chip through a fourth resistor. The source of the first MOS transistor is grounded.
6. The circuit for simulating the power-on button startup function according to claim 5, wherein: The gate of the second MOS transistor is connected to the output pin of the power supply monitoring chip through a fourth resistor. The gate of the second MOS transistor is also connected to the drain of the first MOS transistor. The source of the second MOS transistor is grounded. The drain of the second MOS transistor is connected to the PWRBTN signal through a fifth resistor.
7. The circuit for simulating the power-on button startup function according to claim 4, wherein: The diode is a Schottky diode.
8. The circuit for simulating the power-on button power-on function according to claim 5 or 6, characterized in that: Both the first MOS transistor and the second MOS transistor are N-channel MOS transistors.