A control circuit for limiting the angle of a rudder

Abstract

The utility model discloses a control circuit for limiting rudder angle, including signal source emission module, differential circuit module, inverter module, rudder maximum angle limit module, rudder minimum angle limit module and control signal output module, rudder maximum angle limit module and rudder minimum angle limit module all adopt NE555 chip, signal source emission module respectively with differential circuit module, control signal output module electric connection, differential circuit module and inverter module's input electric connection, inverter module respectively with rudder maximum angle limit module, rudder minimum angle limit module electric connection, rudder maximum angle limit module, rudder minimum angle limit module all are connected with control signal output module, control signal output module is connected with rudder, the utility model discloses can limit the output angle of rudder in the range of predetermining, has solved the equipment damage problem that the output angle of rudder has caused because of the human error operation leads to the overrunning.

Description

Technical Field

[0001] This utility model relates to the field of servo control technology, specifically to a control circuit for limiting the angle of a servo motor. Background Technology

[0002] A servo motor, also known as a servo motor, is an actuator that uses a feedback mechanism to achieve precise control of angle or position. It is widely used in robotics, model aircraft, industrial automation, and other technological fields. The working principle of a servo motor is to receive manually set control signals and then convert them into mechanical rotation at a specified angle, thereby achieving precise control.

[0003] However, in existing technologies, servo motors are typically installed in industrial equipment and used in conjunction with other mechanical structures within that equipment. However, manually set servo motor control signals are susceptible to misoperation. When a servo motor receives an incorrectly input control signal, it is prone to colliding with other mechanical structures, causing structural damage to the equipment and potentially leading to serious safety accidents. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a control circuit for limiting the angle of a servo motor.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A control circuit for limiting the angle of a servo motor includes: a signal source transmitting module, a differentiating circuit module, an inverter module, a servo motor maximum angle limiting module, a servo motor minimum angle limiting module, and a control signal output module; both the servo motor maximum angle limiting module and the servo motor minimum angle limiting module use NE555 chips;

[0007] The signal source transmitting module is electrically connected to the differentiating circuit module and the control signal output module, respectively. The differentiating circuit module is electrically connected to the input terminal of the inverter module. The output terminal of the inverter module is electrically connected to the input terminals of the servo maximum angle limiting module and the servo minimum angle limiting module, respectively. The output terminals of the servo maximum angle limiting module and the servo minimum angle limiting module are both electrically connected to the control signal output module. The control signal output module is connected to the servo.

[0008] Preferably, the servo motor minimum angle limiting module includes a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, and an NE555 chip U1. The output terminal of the inverter module is connected to the input terminal of the NE555 chip U1. The GND terminal of the NE555 chip U1 is grounded. The RST terminal of the NE555 chip U1 is connected to a DC power supply. The VCC terminal of the NE555 chip U1 is connected to the first terminal of the first resistor R1. The second terminal of the first resistor R1 is connected to the first terminal of the first capacitor C1. The second terminal of the first capacitor C1 is connected to the first terminal of the second resistor R2. The NE555 chip U1... The output terminal of the NE555 chip U1 is connected to the control signal output module. The second end of the second resistor R2 is connected between the output terminal of the NE555 chip U1 and the control signal output module. The CON terminal of the NE555 chip U1 is connected to the first end of the second capacitor C2. The second end of the second capacitor C2 is connected between the second end of the first capacitor C1 and the first end of the second resistor R2. The DIS terminal of the NE555 chip U1 is connected to the THR terminal of the NE555 chip U1. Both the DIS terminal and the THR terminal of the NE555 chip U1 are connected between the second end of the first resistor R1 and the first end of the first capacitor C1.

[0009] Preferably, the capacitance value of the second capacitor is set to 10nF.

[0010] Preferably, the servo motor maximum angle limiting module includes a fourth capacitor C4, a fifth capacitor C5, a fourth resistor R4, a fifth resistor R5, and an NE555 chip U2. The output terminal of the inverter module is connected to the input terminal of the NE555 chip U2. The GND terminal of the NE555 chip U2 is grounded. The RST terminal of the NE555 chip U2 is connected to a DC power supply. The VCC terminal of the NE555 chip U2 is connected to the first terminal of the fourth resistor R4. The second terminal of the fourth resistor R4 is connected to the first terminal of the fourth capacitor C4. The second terminal of the fourth capacitor C4 is connected to the first terminal of the fifth resistor R5. The NE555 chip U2... The output terminal of the NE555 chip U2 is connected to the control signal output module. The second terminal of the fifth resistor R5 is connected between the output terminal of the NE555 chip U2 and the control signal output module. The CON terminal of the NE555 chip U2 is connected to the first terminal of the fifth capacitor C5. The second terminal of the fifth capacitor C5 is connected between the second terminal of the fourth capacitor C4 and the first terminal of the fifth resistor R5. The DIS terminal of the NE555 chip U2 is connected to the THR terminal of the NE555 chip U2. Both the DIS terminal and the THR terminal of the NE555 chip U2 are connected between the second terminal of the fourth resistor R4 and the first terminal of the fourth capacitor C4.

[0011] Preferably, the differentiating circuit module includes a third capacitor C3 and a third resistor R3. The first end of the third capacitor C3 is connected to the positive terminal of the signal source transmitting module, the second end of the third capacitor C3 is connected to the input terminal of the inverter module, the first end of the third resistor R3 is connected between the second end of the third capacitor C3 and the input terminal of the inverter module, and the second end of the third resistor R3 is connected to the negative terminal of the signal source transmitting module.

[0012] Preferably, the inverter module uses a 74LS04 chip.

[0013] Preferably, it also includes a power supply module, which is used to supply power to the signal source transmitting module, the differentiating circuit module, the inverter module, the servo maximum angle limiting module, the servo minimum angle limiting module, and the control signal output module.

[0014] Preferably, the control signal output module includes an AND gate circuit unit and an OR gate circuit unit. The signal source transmitting module and the servo motor minimum angle limiting module are both connected to the input terminal of the OR gate circuit unit. The output terminal of the OR gate circuit unit and the servo motor maximum angle limiting module are both connected to the input terminal of the AND gate circuit unit. The output terminal of the AND gate circuit unit is connected to the servo motor.

[0015] Preferably, the control signal output module includes a multiplexer circuit unit, wherein the signal source transmitting module, the servo motor minimum angle limiting module, and the servo motor maximum angle limiting module are all connected to the input terminal of the multiplexer circuit unit, and the output terminal of the multiplexer circuit unit is connected to the servo motor.

[0016] Preferably, the multiplexer circuit unit uses the MPC508AP chip.

[0017] This invention has the following advantages over the prior art:

[0018] (1) The control circuit for limiting the angle of the servo motor of this utility model can effectively limit the control signal of the servo motor through the minimum angle limiting module and the maximum angle limiting module of the servo motor, thereby limiting the output angle of the servo motor within a preset range, thus solving the problem of equipment damage caused by the servo motor output angle exceeding the limit due to human error, and effectively reducing the probability of safety accidents.

[0019] (2) The control circuit of this utility model for limiting the angle of the servo motor can adjust the maximum angle and the minimum angle of the servo motor through the minimum angle limiting module and the maximum angle limiting module of the servo motor, thereby facilitating the adjustment of the servo motor according to the actual working conditions and enhancing the applicability of the servo motor. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a control circuit structure for limiting the angle of a servo motor, which is an embodiment 1 of this utility model.

[0021] Figure 2 This is a schematic diagram of the overall circuit of a control circuit for limiting the angle of a servo motor, which is an embodiment of this utility model.

[0022] Figure 3 This is a waveform diagram of the output circuit of each module in a control circuit for limiting the angle of a servo motor, according to Embodiment 1 of this utility model.

[0023] Figure 4 This is a waveform diagram of the output circuit of each module when the servo control signal angle is less than the minimum servo angle in Embodiment 1 of this utility model.

[0024] Figure 5 This is a waveform diagram of the output circuit of each module when the servo control signal angle is between the minimum and maximum servo angles of the servo motor, according to Embodiment 1 of this utility model.

[0025] Figure 6 This is a waveform diagram of the output circuit of each module when the servo control signal angle is greater than the maximum servo angle in Embodiment 1 of this utility model.

[0026] Figure 7 This is a schematic diagram of a control circuit structure for limiting the angle of a servo motor, which is an embodiment 2 of this utility model.

[0027] Figure 8 This is a schematic diagram of the overall circuit of a control circuit for limiting the angle of a servo motor, which is an embodiment 2 of this utility model.

[0028] Figure 9 This is a waveform diagram of the output circuit of each module when the servo control signal angle is less than the minimum servo angle in Embodiment 2 of this utility model.

[0029] Figure 10 This is a waveform diagram of the output circuit of each module when the servo control signal angle is between the minimum and maximum servo angles of the servo motor, according to Embodiment 2 of this utility model.

[0030] Figure 11 This is a waveform diagram of the output circuit of each module when the servo control signal angle is greater than the maximum servo angle in Embodiment 2 of this utility model. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Example 1

[0033] like Figures 1-2 As shown, a control circuit for limiting the angle of a servo motor includes: a signal source transmitting module, a differentiating circuit module, an inverter module, a servo motor maximum angle limiting module, a servo motor minimum angle limiting module, and a control signal output module; both the servo motor maximum angle limiting module and the servo motor minimum angle limiting module use NE555 chips;

[0034] The signal source transmitting module is electrically connected to the differentiating circuit module and the control signal output module, respectively. The differentiating circuit module is electrically connected to the input terminal of the inverter module. The output terminal of the inverter module is electrically connected to the input terminals of the servo maximum angle limiting module and the servo minimum angle limiting module, respectively. The output terminals of the servo maximum angle limiting module and the servo minimum angle limiting module are both electrically connected to the control signal output module. The control signal output module is connected to the servo.

[0035] like Figure 2 As shown, the servo motor minimum angle limiting module includes a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, and an NE555 chip U1. The output terminal of the inverter module is connected to the input terminal of the NE555 chip U1. The GND terminal of the NE555 chip U1 is grounded. The RST terminal of the NE555 chip U1 is connected to a 5V DC power supply. The VCC terminal of the NE555 chip U1 is connected to the first end of the first resistor R1. The second end of the first resistor R1 is connected to the first end of the first capacitor C1. The second end of the first capacitor C1 is connected to the first end of the second resistor R2. The NE555 chip U1... The output terminal of 1 is connected to the control signal output module. The second terminal of the second resistor R2 is connected between the output terminal of the NE555 chip U1 and the control signal output module. The CON terminal of the NE555 chip U1 is connected to the first terminal of the second capacitor C2. The second terminal of the second capacitor C2 is connected between the second terminal of the first capacitor C1 and the first terminal of the second resistor R2. The DIS terminal of the NE555 chip U1 is connected to the THR terminal of the NE555 chip U1. Both the DIS terminal and the THR terminal of the NE555 chip U1 are connected between the second terminal of the first resistor R1 and the first terminal of the first capacitor C1.

[0036] Specifically, in this embodiment, the capacitance values ​​of the first capacitor and the second capacitor are both set to 10nF, the resistance value of the first resistor is set to 45.45kΩ, and the resistance value of the second resistor is set to 100Ω.

[0037] like Figure 2As shown, the servo motor maximum angle limiting module includes a fourth capacitor C4, a fifth capacitor C5, a fourth resistor R4, a fifth resistor R5, and an NE555 chip U2. The output terminal of the inverter module is connected to the input terminal of the NE555 chip U2. The GND terminal of the NE555 chip U2 is grounded. The RST terminal of the NE555 chip U2 is connected to a 5V DC power supply. The VCC terminal of the NE555 chip U2 is connected to the first terminal of the fourth resistor R4. The second terminal of the fourth resistor R4 is connected to the first terminal of the fourth capacitor C4. The second terminal of the fourth capacitor C4 is connected to the first terminal of the fifth resistor R5. The NE555 chip U2... The output terminal of 2 is connected to the control signal output module. The second terminal of the fifth resistor R5 is connected between the output terminal of the NE555 chip U2 and the control signal output module. The CON terminal of the NE555 chip U2 is connected to the first terminal of the fifth capacitor C5. The second terminal of the fifth capacitor C5 is connected between the second terminal of the fourth capacitor C4 and the first terminal of the fifth resistor R5. The DIS terminal of the NE555 chip U2 is connected to the THR terminal of the NE555 chip U2. Both the DIS terminal and the THR terminal of the NE555 chip U2 are connected between the second terminal of the fourth resistor R4 and the first terminal of the fourth capacitor C4.

[0038] Specifically, in this embodiment, the capacitance values ​​of the fourth and fifth capacitors are both set to 10nF, the resistance value of the fourth resistor is set to 227.3kΩ, and the resistance value of the fifth resistor is set to 100Ω.

[0039] like Figure 2 As shown, the differentiating circuit module includes a third capacitor C3 and a third resistor R3. The first end of the third capacitor C3 is connected to the positive terminal of the signal source transmitting module, the second end of the third capacitor C3 is connected to the input terminal of the inverter module, the first end of the third resistor R3 is connected between the second end of the third capacitor C3 and the input terminal of the inverter module, and the second end of the third resistor R3 is connected to the negative terminal of the signal source transmitting module.

[0040] Specifically, the inverter module uses a 74LS04 chip U3.

[0041] Specifically, the control circuit for limiting the servo motor angle further includes a power supply module, which supplies power to the signal source transmitting module, the differentiating circuit module, the inverter module, the servo motor maximum angle limiting module, the servo motor minimum angle limiting module, and the control signal output module.

[0042] like Figures 1-2As shown, the control signal output module includes an AND gate circuit unit and an OR gate circuit unit. The signal source transmitting module and the servo motor minimum angle limiting module are both connected to the input terminal of the OR gate circuit unit. The output terminal of the OR gate circuit unit and the servo motor maximum angle limiting module are both connected to the input terminal of the AND gate circuit unit. The output terminal of the AND gate circuit unit is connected to the servo motor.

[0043] Specifically, such as Figure 2 As shown, in this embodiment, the OR gate circuit unit adopts a 74LS32N chip U4, and the AND gate circuit unit adopts a 74LS08N chip U5.

[0044] The working principle of a control circuit for limiting the angle of a servo motor is as follows:

[0045] like Figure 3 As shown in (a), the signal source transmitting module receives a pulse width modulation (PWM) signal corresponding to the servo output angle from a manual or automatic control command and sends it to the OR gate circuit unit and the differentiating circuit module, such as... Figure 3 As shown in (b), the differentiating circuit module processes the rising edge of each cycle of the pulse width adjustment signal to generate a spike signal corresponding to the pulse width adjustment signal, such as... Figure 3 As shown in (c), the inverter module shapes the spike signal to generate a rectangular signal with a very small duty cycle; Figure 3 (d) and Figure 3 (e) The servo maximum angle limiting module and the servo minimum angle limiting module use the rectangular signal output by the inverter module as the input trigger signal. The servo maximum angle limiting module and the servo minimum angle limiting module respectively output preset servo maximum limiting angle rectangular signals and minimum limiting angle rectangular signals, such as... Figures 4-6 As shown, the pulse width adjustment signal and the minimum limiting angle rectangle signal corresponding to the servo output angle output by the signal source transmitting module are input into the OR gate circuit unit. Then, the circuit waveform signal and the maximum limiting angle rectangle signal output by the OR gate circuit unit are input into the AND gate circuit unit for processing. When the servo output angle output by the signal source transmitting module is less than the minimum limiting angle, the AND gate circuit unit outputs the minimum limiting angle rectangle signal to the servo for control. When the servo output angle output by the signal source transmitting module is between the minimum limiting angle and the maximum limiting angle, the AND gate circuit unit outputs the original pulse width adjustment signal of the signal source transmitting module to the servo for control. When the servo output angle output by the signal source transmitting module is greater than the maximum limiting angle, the AND gate circuit unit outputs the maximum limiting angle rectangle signal to the servo for control, thereby completing the range limitation of the servo output angle.

[0046] Example 2

[0047] like Figures 7-8 As shown, a control circuit for limiting the angle of a servo motor includes: a signal source transmitting module, a differentiating circuit module, an inverter module, a servo motor maximum angle limiting module, a servo motor minimum angle limiting module, and a control signal output module; both the servo motor maximum angle limiting module and the servo motor minimum angle limiting module use NE555 chips;

[0048] The signal source transmitting module is electrically connected to the differentiating circuit module and the control signal output module, respectively. The differentiating circuit module is electrically connected to the input terminal of the inverter module. The output terminal of the inverter module is electrically connected to the input terminals of the servo maximum angle limiting module and the servo minimum angle limiting module, respectively. The output terminals of the servo maximum angle limiting module and the servo minimum angle limiting module are both electrically connected to the control signal output module. The control signal output module is connected to the servo.

[0049] like Figure 8 As shown, the servo motor minimum angle limiting module includes a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, and an NE555 chip U1. The output terminal of the inverter module is connected to the input terminal of the NE555 chip U1. The GND terminal of the NE555 chip U1 is grounded. The RST terminal of the NE555 chip U1 is connected to a 4V DC power supply. The VCC terminal of the NE555 chip U1 is connected to the first end of the first resistor R1. The second end of the first resistor R1 is connected to the first end of the first capacitor C1. The second end of the first capacitor C1 is connected to the first end of the second resistor R2. The NE555 chip U1... The output terminal of 1 is connected to the control signal output module. The second terminal of the second resistor R2 is connected between the output terminal of the NE555 chip U1 and the control signal output module. The CON terminal of the NE555 chip U1 is connected to the first terminal of the second capacitor C2. The second terminal of the second capacitor C2 is connected between the second terminal of the first capacitor C1 and the first terminal of the second resistor R2. The DIS terminal of the NE555 chip U1 is connected to the THR terminal of the NE555 chip U1. Both the DIS terminal and the THR terminal of the NE555 chip U1 are connected between the second terminal of the first resistor R1 and the first terminal of the first capacitor C1.

[0050] Specifically, in this embodiment, the capacitance values ​​of the first capacitor and the second capacitor are both set to 10nF, the resistance value of the first resistor is set to 45.45kΩ, and the resistance value of the second resistor is set to 100Ω.

[0051] like Figure 8As shown, the servo motor maximum angle limiting module includes a fourth capacitor C4, a fifth capacitor C5, a fourth resistor R4, a fifth resistor R5, and an NE555 chip U2. The output terminal of the inverter module is connected to the input terminal of the NE555 chip U2. The GND terminal of the NE555 chip U2 is grounded. The RST terminal of the NE555 chip U2 is connected to a 4V DC power supply. The VCC terminal of the NE555 chip U2 is connected to the first terminal of the fourth resistor R4. The second terminal of the fourth resistor R4 is connected to the first terminal of the fourth capacitor C4. The second terminal of the fourth capacitor C4 is connected to the first terminal of the fifth resistor R5. The NE555 chip U2... The output terminal of 2 is connected to the control signal output module. The second terminal of the fifth resistor R5 is connected between the output terminal of the NE555 chip U2 and the control signal output module. The CON terminal of the NE555 chip U2 is connected to the first terminal of the fifth capacitor C5. The second terminal of the fifth capacitor C5 is connected between the second terminal of the fourth capacitor C4 and the first terminal of the fifth resistor R5. The DIS terminal of the NE555 chip U2 is connected to the THR terminal of the NE555 chip U2. Both the DIS terminal and the THR terminal of the NE555 chip U2 are connected between the second terminal of the fourth resistor R4 and the first terminal of the fourth capacitor C4.

[0052] Specifically, in this embodiment, the capacitance values ​​of the fourth and fifth capacitors are both set to 10nF, the resistance value of the fourth resistor is set to 227.3kΩ, and the resistance value of the fifth resistor is set to 100Ω.

[0053] like Figure 8 As shown, the differentiating circuit module includes a third capacitor C3 and a third resistor R3. The first end of the third capacitor C3 is connected to the positive terminal of the signal source transmitting module, the second end of the third capacitor C3 is connected to the input terminal of the inverter module, the first end of the third resistor R3 is connected between the second end of the third capacitor C3 and the input terminal of the inverter module, and the second end of the third resistor R3 is connected to the negative terminal of the signal source transmitting module.

[0054] Specifically, the inverter module uses a 74LS04 chip U3.

[0055] Specifically, the control circuit for limiting the servo motor angle further includes a power supply module, which supplies power to the signal source transmitting module, the differentiating circuit module, the inverter module, the servo motor maximum angle limiting module, the servo motor minimum angle limiting module, and the control signal output module.

[0056] like Figures 7-8As shown, the control signal output module includes a multiplexer circuit unit. The signal source transmitting module, the servo motor minimum angle limiting module, and the servo motor maximum angle limiting module are all connected to the input terminal of the multiplexer circuit unit, and the output terminal of the multiplexer circuit unit is connected to the servo motor.

[0057] Specifically, in this embodiment, the multiplexer circuit unit uses the MPC508AP chip.

[0058] Specifically, the working principle of the control circuit for limiting the servo motor angle in this embodiment is basically the same as that in Embodiment 1, the difference being that this embodiment uses a multiplexer circuit unit as the control signal output module, and uses an MPC508AP chip as the multiplexer circuit unit; for example Figures 9-11 As shown, the pulse width adjustment signal, minimum limit angle rectangle signal, and maximum limit angle rectangle signal corresponding to the servo output angle output by the signal source transmitting module are input to the multiplexer circuit unit. When the servo output angle output by the signal source transmitting module is less than the minimum limit angle, the multiplexer circuit unit outputs the minimum limit angle rectangle signal to the servo for control. When the servo output angle output by the signal source transmitting module is between the minimum and maximum limit angles, the multiplexer circuit unit outputs the original pulse width adjustment signal from the signal source transmitting module to the servo for control. When the servo output angle output by the signal source transmitting module is greater than the maximum limit angle, the multiplexer circuit unit outputs the maximum limit angle rectangle signal to the servo for control, thereby completing the range limitation of the servo output angle.

[0059] The above-described specific embodiments are preferred embodiments of this utility model and are not intended to limit this utility model. Any other changes or equivalent substitutions made without departing from the technical solution of this utility model are included within the protection scope of this utility model.

Claims

1. A control circuit for limiting the angle of a servo motor, characterized in that, include: The system includes a signal source transmitting module, a differentiating circuit module, an inverter module, a servo motor maximum angle limiting module, a servo motor minimum angle limiting module, and a control signal output module; both the servo motor maximum angle limiting module and the servo motor minimum angle limiting module use the NE555 chip. The signal source transmitting module is electrically connected to the differentiating circuit module and the control signal output module, respectively. The differentiating circuit module is electrically connected to the input terminal of the inverter module. The output terminal of the inverter module is electrically connected to the input terminals of the servo maximum angle limiting module and the servo minimum angle limiting module, respectively. The output terminals of the servo maximum angle limiting module and the servo minimum angle limiting module are both electrically connected to the control signal output module. The control signal output module is connected to the servo.

2. The control circuit for limiting the angle of a servo motor according to claim 1, characterized in that, The servo motor minimum angle limiting module includes a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, and an NE555 chip U1. The output terminal of the inverter module is connected to the input terminal of the NE555 chip U1. The GND terminal of the NE555 chip U1 is grounded, and the RST terminal of the NE555 chip U1 is connected to a DC power supply. The VCC terminal of the NE555 chip U1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is connected to the first end of the second resistor R2. The output of the NE555 chip U1 is connected to the input terminal of the inverter module. The output terminal is connected to the control signal output module. The second end of the second resistor R2 is connected between the output terminal of the NE555 chip U1 and the control signal output module. The CON terminal of the NE555 chip U1 is connected to the first end of the second capacitor C2. The second end of the second capacitor C2 is connected between the second end of the first capacitor C1 and the first end of the second resistor R2. The DIS terminal of the NE555 chip U1 is connected to the THR terminal of the NE555 chip U1. Both the DIS terminal and the THR terminal of the NE555 chip U1 are connected between the second end of the first resistor R1 and the first end of the first capacitor C1.

3. A control circuit for limiting the angle of a servo motor according to claim 2, characterized in that, The capacitance value of the second capacitor is set to 10nF.

4. A control circuit for limiting the angle of a servo motor according to claim 1, characterized in that, The servo motor maximum angle limiting module includes a fourth capacitor C4, a fifth capacitor C5, a fourth resistor R4, a fifth resistor R5, and an NE555 chip U2. The output terminal of the inverter module is connected to the input terminal of the NE555 chip U2. The GND terminal of the NE555 chip U2 is grounded, the RST terminal of the NE555 chip U2 is connected to a DC power supply, the VCC terminal of the NE555 chip U2 is connected to the first terminal of the fourth resistor R4, the second terminal of the fourth resistor R4 is connected to the first terminal of the fourth capacitor C4, the second terminal of the fourth capacitor C4 is connected to the first terminal of the fifth resistor R5, and the output terminal of the NE555 chip U2 is connected to the input terminal of the NE555 chip U2. The output terminal is connected to the control signal output module. The second end of the fifth resistor R5 is connected between the output terminal of the NE555 chip U2 and the control signal output module. The CON terminal of the NE555 chip U2 is connected to the first end of the fifth capacitor C5. The second end of the fifth capacitor C5 is connected between the second end of the fourth capacitor C4 and the first end of the fifth resistor R5. The DIS terminal of the NE555 chip U2 is connected to the THR terminal of the NE555 chip U2. Both the DIS terminal and the THR terminal of the NE555 chip U2 are connected between the second end of the fourth resistor R4 and the first end of the fourth capacitor C4.

5. A control circuit for limiting the angle of a servo motor according to claim 1, characterized in that, The differentiating circuit module includes a third capacitor C3 and a third resistor R3. The first end of the third capacitor C3 is connected to the positive terminal of the signal source transmitting module, the second end of the third capacitor C3 is connected to the input terminal of the inverter module, the first end of the third resistor R3 is connected between the second end of the third capacitor C3 and the input terminal of the inverter module, and the second end of the third resistor R3 is connected to the negative terminal of the signal source transmitting module.

6. A control circuit for limiting the angle of a servo motor according to claim 1, characterized in that, The inverter module uses a 74LS04 chip.

7. A control circuit for limiting the angle of a servo motor according to claim 1, characterized in that, It also includes a power supply module, which supplies power to the signal source transmitting module, the differentiating circuit module, the inverter module, the servo maximum angle limiting module, the servo minimum angle limiting module, and the control signal output module.

8. A control circuit for limiting the angle of a servo motor according to claim 1, characterized in that, The control signal output module includes an AND gate circuit unit and an OR gate circuit unit. The signal source transmitting module and the servo motor minimum angle limiting module are both connected to the input terminal of the OR gate circuit unit. The output terminal of the OR gate circuit unit and the servo motor maximum angle limiting module are both connected to the input terminal of the AND gate circuit unit. The output terminal of the AND gate circuit unit is connected to the servo motor.

9. A control circuit for limiting the angle of a servo motor according to claim 1, characterized in that, The control signal output module includes a multiplexer circuit unit. The signal source transmitting module, the servo motor minimum angle limiting module, and the servo motor maximum angle limiting module are all connected to the input terminal of the multiplexer circuit unit, and the output terminal of the multiplexer circuit unit is connected to the servo motor.

10. A control circuit for limiting the angle of a servo motor according to claim 9, characterized in that, The multiplexer circuit unit uses the MPC508AP chip.

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