Zener diode protection circuit based on printer

Abstract

The utility model discloses a Zener diode protection circuit based on a printer, comprising an overvoltage protection of a microcontroller, a Zener diode protection circuit structure and a Zener diode input protection circuit, according to the utility model, a Zener diode with a voltage stabilization value of 5.1 V is used on an IO pin of the microcontroller, and when an input voltage exceeds 5.1 V, the Zener diode protection circuit structure is connected with the Zener diode input protection circuit structure. The Zener diode is conducted and absorbs redundant voltage, the voltage is kept at a safe level, and it is ensured that the microcontroller cannot be damaged due to overvoltage; the Zener diode protection circuit structure is simulated through simulation software, it is ensured that the Zener diode protection circuit deals with overvoltage conditions caused by power supply internal faults or external distribution line problems, the control circuit takes actions by setting threshold voltage, overvoltage protection is achieved, challenges of the background technology are effectively solved, and the protection effect of the Zener diode protection circuit is improved. The protection mechanism can automatically trigger and cut off the power supply or safely transfer the additional voltage when the input voltage exceeds the safety threshold, thereby preventing possible damage to electronic components.

Description

TECHNICAL FIELD

[0001] The utility model relates to a printer field especially a zener diode protection circuit based on printer. BACKGROUND

[0002] In the field of printer power supply processing control, the common and tricky problem is power overvoltage damage, because many users may connect wrong lines or encounter power overvoltage when using board cards, which leads to easy damage of the board card, and the existing overvoltage protection power supply safety is to automatically cut off the power supply when the input voltage exceeds the safety threshold to prevent possible damage to electronic components, and most power supply systems integrate overvoltage protection circuits, which can cope with overvoltage caused by internal faults or external power distribution line problems, and the severity and influence range of overvoltage vary greatly, from slight performance reduction to serious component damage, and even may cause circuit failure or fire. SUMMARY

[0003] The utility model discloses a zener diode protection circuit based on printer to solve the technical problem existing above.

[0004] The technical scheme of the utility model is realized as follows:

[0005] The utility model relates to a zener diode protection circuit based on printer, including microcontroller's overvoltage protection, zener diode protection circuit structure and zener diode input protection circuit.

[0006] The microcontroller's overvoltage protection is through using the zener diode to limit the overhigh voltage exceeding the microcontroller IO pin rated voltage, and the microcontroller is protected from damage, wherein when the input voltage exceeds the zener diode's voltage stabilizing value, the zener diode is turned on and absorbs the excess voltage.

[0007] The zener diode protection circuit structure is through simulation software simulation zener diode protection circuit structure, and the reaction of the circuit under different voltage conditions is predicted.

[0008] The zener diode input protection circuit is used to limit voltage when the input voltage exceeds a certain specific value, and prevent the overhigh voltage from entering the circuit.

[0009] As preferred, the microcontroller's overvoltage protection includes microcontroller, the microcontroller is connected with the ground through the first zener diode D1, the first zener diode D1 is also connected with the zener diode input protection circuit through the first resistance R1, wherein the first zener diode D1 is 5.1V zener diode.

[0010] As preferred, the Zener diode protection circuit structure includes an input voltage V, the input voltage V is connected with the ground through a second Zener diode D2, one end of the second Zener diode D2 is also connected with the power supply end through a first resistor R1, the positive pole of the power supply end is connected with the negative pole V1 of the power supply end through a first capacitor C1, and the negative pole V1 of the power supply end is also connected with the ground, wherein the first resistor R1 is 100R, and the second Zener diode D2 connected with the ground is 1N4099.

[0011] As preferred, the Zener diode input protection circuit includes an input voltage 6V, and the Zener diode input protection circuit is connected with the Zener diode protection circuit structure, wherein the positive pole of the power supply end is 6V voltage, and the output voltage V is 5.999V.

[0012] As preferred, the Zener diode input protection circuit includes an input voltage 6.8V, and the Zener diode input protection circuit is connected with the Zener diode protection circuit structure, wherein the positive pole of the power supply end is 6.8V voltage, and the output voltage V is 6.785V.

[0013] As preferred, the Zener diode input protection circuit includes an input voltage 7.5V, and the Zener diode input protection circuit is connected with the Zener diode protection circuit structure, wherein the positive pole of the power supply end is 7.5V voltage, and the output voltage V is 6.883V. Beneficial effects

[0014] By introducing the overvoltage protection mechanism based on the Zener diode, the challenges in the background art are effectively solved, which can automatically trigger when the input voltage exceeds the safety threshold, cut off the power or safely divert the extra voltage, thereby preventing possible damage to electronic components; by using a Zener diode with a stable voltage value of 5.1V on the IO pin of the microcontroller, when the input voltage exceeds 5.1V, the Zener diode is turned on and absorbs the excess voltage, keeping the voltage at a safe level, ensuring that the microcontroller will not be damaged by overvoltage; by simulating the Zener diode protection circuit structure through simulation software, potential problems can be found before actual application, and the design can be optimized to ensure that the circuit works as expected under real conditions, and the Zener diode protection circuit can cope with overvoltage caused by internal power supply failure or external power distribution line problems, by setting a threshold voltage, when the voltage exceeds the threshold, the control circuit will take action to achieve overvoltage protection; in summary, this technology not only improves the stability and safety of the printer circuit, but also ensures the stable operation and long-term reliability of the printer circuit under various voltage fluctuations through precise control and fast response. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a circuit frame schematic diagram of the utility model;

[0016] Figure 2 is a schematic diagram of the overvoltage protection circuit of the microcontroller of the utility model;

[0017] Figure 3 is a schematic diagram of the zener diode protection circuit structure of the utility model;

[0018] Figure 4 is one of the schematic diagrams of the zener diode input protection circuit of the utility model;

[0019] Figure 5 is the second schematic diagram of the zener diode input protection circuit of the utility model;

[0020] Figure 6 is the third schematic diagram of the zener diode input protection circuit of the utility model. DETAILED DESCRIPTION

[0021] As Figures 1-6 shown, the utility model discloses a zener diode protection circuit based on printer, including microcontroller's overvoltage protection, zener diode protection circuit structure and zener diode input protection circuit;

[0022] Microcontroller's overvoltage protection, by using voltage stabilizing diode limit overvoltage that exceeds microcontroller IO pin rated voltage, protect microcontroller from damage, wherein when input voltage exceeds the voltage stabilizing value of zener diode, zener diode is turned on and absorbs the excess voltage, keeps voltage at a safe level, ensures that the IO pin of microcontroller will not be damaged due to overvoltage;

[0023] Zener diode protection circuit structure, through simulation software simulation zener diode protection circuit structure, predicts the reaction of circuit under different voltage conditions, helps to find potential problems before actual application, and optimizes design, ensures that the circuit can work as expected under real conditions;

[0024] Zener diode input protection circuit is used to limit voltage when input voltage exceeds a certain specific value, prevent excessive voltage from entering the circuit, and zener diode plays a key role here, it can be turned on when voltage exceeds its stable voltage, thereby "clamping" voltage, protecting the circuit from damage.

[0025] As preferred, the overvoltage protection circuit of the microcontroller includes a microcontroller, the microcontroller is connected with the ground through a first zener diode D1, the first zener diode D1 is also connected with the zener diode input protection circuit through a first resistor R1, wherein the first zener diode D1 is a 5.1V voltage stabilizing diode.

[0026] The microcontroller can be anything with a maximum 5V rating on the IO pins, so anything above 5V can damage the microcontroller, the first zener diode D1 used in the overvoltage protection circuit of the microcontroller will work normally in the case of overvoltage, if the voltage is greater than 5.1V, the zener diode will pass current and control the voltage up to 5.1V, but below 5.1V, the zener diode will work like a normal diode and block.

[0027] As a preferred, the zener diode protection circuit structure includes an input voltage V, the input voltage V is connected with the ground through the second zener diode D2, one end of the second zener diode D2 is also connected with the power supply end through the first resistor R1, the positive of the power supply end is connected with the negative of the power supply end V1 through the first capacitor C1, and the negative of the power supply end V1 is also connected with the ground, wherein the first resistor R1 is 100R, and the second zener diode D2 connected with the ground is 1N4099.

[0028] The first resistor R1 and the second zener diode D2 are two components for protecting the output from overvoltage protection, wherein the second zener diode D2 is a 6.8V zener diode, and if V1 exceeds 6.8V, the output will be protected, and due to the 6.8V reference voltage of the second zener diode D2, the output will be kept at a maximum of 6.8V.

[0029] As a preferred, the zener diode input protection circuit includes an input voltage of 6V, and the zener diode input protection circuit is connected with the zener diode protection circuit structure, wherein the positive of the power supply end is 6V voltage, and the voltage V of the output is 5.999V.

[0030] The input protection circuit of the zener diode keeps the output constant at 5.999V, i.e. 6.0V, during the 6V input voltage of V1.

[0031] As a preferred, the zener diode input protection circuit includes an input voltage of 6.8V, and the zener diode input protection circuit is connected with the zener diode protection circuit structure, wherein the positive of the power supply end is 6.8V voltage, and the voltage V of the output is 6.785V.

[0032] The zener diode input protection circuit in the circuit simulation, the input voltage is 6.8V, and the output is 6.785V, close to 6.8V.

[0033] As a preferred, the zener diode input protection circuit includes an input voltage of 7.5V, and the zener diode input protection circuit is connected with the zener diode protection circuit structure, wherein the positive of the power supply end is 7.5V voltage, and the voltage V of the output is 6.883V.

[0034] The overvoltage protection function of the microcontroller is realized by using a 5.1V first Zener diode D1, which is connected with the ground and connected with a 100R current limiting resistor first resistor R1 to the Zener diode input protection circuit; this configuration ensures that even if the input voltage exceeds 5V, due to the conduction of the Zener diode, the voltage will be limited to 5.1V, preventing damage to the microcontroller IO pin;

[0035] Then, the Zener diode protection circuit structure part predicts the behavior of the circuit under different voltage conditions through simulation software, which helps to find and solve potential problems before actual application, thereby optimizing the design and improving the reliability of the circuit under real working conditions; in addition, the Zener diode input protection circuit plays a key role when facing an excessively high input voltage, for example, under an input voltage of 6V or 6.8V, through the conduction of the Zener diode, the output voltage is stabilized at a stable level close to but not exceeding the input voltage, thereby protecting the circuit from damage caused by excessive voltage;

[0036] Finally, when the input voltage is further increased to 7.5V, the Zener diode input protection circuit still works effectively, controlling the output voltage at 6.883V, which again proves the adaptability and effectiveness of the protection circuit for different overvoltage conditions; in summary, this Zener diode-based protection circuit design, through the technical means of hardware and simulation software simulation of the Zener diode protection circuit structure, provides comprehensive overvoltage protection for the printer, not only enhancing the robustness of the circuit, but also improving user experience and safety performance of the equipment, through precise control and rapid response, this design ensures the stable operation and long-term reliability of the printer circuit under various voltage fluctuations, solving the problem of board card damage caused by user connection error or power overvoltage in the field of printer power supply processing control.

Claims

1. A Zener diode protection circuit based on a printer, characterized in that: Includes microcontroller overvoltage protection, Zener diode protection circuit structure and Zener diode input protection circuit; The overvoltage protection of the microcontroller protects the microcontroller from damage by limiting the excessive voltage that exceeds the rated voltage of the microcontroller IO pin using a Zener diode, wherein when the input voltage exceeds the regulated voltage value of the Zener diode, the Zener diode turns on and absorbs the excess voltage; The Zener diode input protection circuit is used to limit the voltage when the input voltage exceeds a certain value, so as to prevent excessively high voltage from entering the circuit.

2. The printer-based Zener diode protection circuit according to claim 1, characterized in that: The overvoltage protection of the microcontroller includes a microcontroller, which is connected to the ground through a first Zener diode D1. The first Zener diode D1 is also connected to a Zener diode input protection circuit through a first resistor R1. The first Zener diode D1 is a 5.1V voltage regulator diode.

3. The printer-based Zener diode protection circuit according to claim 1, characterized in that: The Zener diode protection circuit structure includes an input voltage V, which is connected to the ground through a second Zener diode D2. One end of the second Zener diode D2 is also connected to the power supply end through a first resistor R1. The positive electrode of the power supply end is connected to the negative electrode V1 of the power supply end through a first capacitor C1. The negative electrode V1 of the power supply end is also connected to the ground, wherein the first resistor R1 is 100R, and the second Zener diode D2 connected to the ground is 1N4099.

4. The printer-based Zener diode protection circuit according to claim 1, characterized in that: The Zener diode input protection circuit includes an input voltage of 6V, and the Zener diode input protection circuit is connected to the Zener diode protection circuit structure, wherein the positive pole of the power supply end is 6V voltage, and the output voltage V is 5.999V.

5. The printer-based Zener diode protection circuit according to claim 1, characterized in that: The Zener diode input protection circuit includes an input voltage of 6.8V, and the Zener diode input protection circuit is connected to the Zener diode protection circuit structure, wherein the positive pole of the power supply end is 6.8V voltage, and the output voltage V is 6.785V.

6. The printer-based Zener diode protection circuit according to claim 1, characterized in that: The Zener diode input protection circuit includes an input voltage of 7.5V, and the Zener diode input protection circuit is connected to the Zener diode protection circuit structure, wherein the positive pole of the power supply end is 7.5V voltage, and the output voltage V is 6.883V.

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