A push-pull redundant backup circuit for unmanned aerial vehicle electric governor and steering engine control signals

Abstract

The utility model belongs to the field of unmanned plane control circuit, specifically disclose a kind of unmanned plane electric governor, steering engine control signal push-pull redundancy backup circuit, including MCU chip U1, switch control MOS tube Q2, switch control MOS tube Q1 and diode D3;The 1st pin of U1 is connected with the 2nd pin of D3 by resistance;The 1st pin of D3 is connected by resistance voltage signal;The 1st pin of U1 is connected with the 1st pin of Q2 by resistance, the 1st pin of Q2 is grounded by resistance, the 3rd pin of Q2 is connected by resistance voltage signal;The 3rd pin of Q2 is connected with the 1st pin of Q1 by resistance, the 1st pin of Q1 is grounded by resistance, the 3rd pin of Q1 is connected with the 1st pin of D3.The output signal of the utility model's U1 can be simultaneously output to outside with push-pull circuit, and the output signal of U1 can also seamlessly realize keeping output to outside under the condition of push-pull circuit failure, to improve the safety of unmanned plane flight process.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) control circuits, and particularly to ESC and servo control signal circuits. Specifically, it discloses a push-pull redundant backup circuit for UAV ESC and servo control signals. Background Technology

[0002] Currently, in UAV flight control systems, the control of electronic speed controllers (ESCs) and servos typically employs PWM (Pulse Width Modulation) signals for precise control. PWM control circuits achieve precise regulation of motor speed or servo angle by adjusting the duty cycle of the pulse signal. These circuits are widely used in various UAV platforms due to their high control accuracy and fast response speed.

[0003] To improve signal transmission stability and anti-interference capabilities, push-pull circuits are commonly used as the output stage of PWM signals in existing technologies. Push-pull circuits offer advantages such as low output impedance, strong driving capability, and fast response speed, effectively enhancing the strength of control signals and improving the stability of the entire UAV control system. However, when UAVs operate in complex environments, circuit modules still face certain failure risks. For example, damage to a transistor in the push-pull circuit can lead to abnormal signal output, causing ESC or servo control failure, seriously affecting flight safety.

[0004] Although some existing systems employ redundancy design principles, a mechanism for rapid and seamless switching to backup signal paths is still lacking in the event of a push-pull circuit failure. This results in the system being unable to restore stable output within a very short time. Therefore, there is an urgent need for a highly reliable ESC and servo control signal output solution capable of automatic redundancy switching to improve the fault tolerance and overall reliability of UAV systems.

[0005] In summary, existing PWM signal output circuits still have shortcomings in terms of reliability and redundancy switching mechanisms. It is necessary to further optimize their circuit structure design to meet the higher requirements for system safety and stability in practical applications. Summary of the Invention

[0006] To achieve the above objectives, this utility model provides a push-pull redundant backup circuit for UAV ESC and servo control signals, including: MCU chip U1, switch control MOSFET Q2, switch control MOSFET Q1, and diode D3;

[0007] The first pin of the MCU chip U1 is connected to the second pin of the D3 by resistor R3;

[0008] The first pin of D3 is connected to a 5V voltage signal via resistor R2;

[0009] The first pin of the MCU chip U1 is connected to the first pin of Q2 via resistor R7. The first pin of Q2 is grounded via resistor R8 to the second pin of Q2. The third pin of Q2 is connected to a 5V voltage signal via resistor R4.

[0010] The third pin of Q2 is connected to the first pin of Q1 via resistor R5. The first pin of Q1 is grounded via resistor R6 to the second pin of Q1. The third pin of Q1 is connected to the first pin of D3.

[0011] In one possible implementation, the MCU chip U1 is model STM32G474RET6.

[0012] In one possible implementation, the switching control MOSFET Q2 is model AO3400A.

[0013] In one possible implementation, the switching control MOSFET Q1 is model AO3400A.

[0014] In one possible implementation, diode D2 is designated as IN4148WT.

[0015] In a possible implementation, the MCU chip U1 outputs a PWM (high level state) signal to control Q2 to turn on, pulling the 5V pull-up level to a low level. After controlling Q1 to turn off, a push-pull output of 5V high level is achieved. The MCU chip U1 outputs a PWM (high level state) signal simultaneously through resistor R3 for redundant backup output.

[0016] The advantages of this invention are: the output signal PWM of the MCU chip U1 and the push-pull circuit can be output simultaneously, and the output signal of the MCU chip U1 can still be seamlessly maintained even when the push-pull circuit fails. While using the push-pull circuit to enhance signal strength and improve system stability, it also provides redundant design for the input signal, thereby improving the safety of the UAV flight process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation

[0018] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0019] The push-pull redundant backup circuit for the UAV ESC and servo control signals in this embodiment includes: MCU chip U1, switch control MOSFET Q2, switch control MOSFET Q1, and diode D3;

[0020] The first pin of the MCU chip U1 is connected to the second pin of the diode D3 through resistor R3;

[0021] The first pin of diode D3 is connected to a 5V voltage signal through resistor R2;

[0022] The first pin of the MCU chip U1 is connected to the first pin of the MOSFET Q2 through resistor R7, the first pin of the MOSFET Q2 is grounded through resistor R8, and the third pin of the MOSFET Q2 is connected to a 5V voltage signal through resistor R4.

[0023] The third pin of the MOSFET Q2 is connected to the first pin of the MOSFET Q1 through resistor R5. The first pin of the MOSFET Q1 is grounded through resistor R6. The third pin of the MOSFET Q1 is connected to the first pin of the diode D3.

[0024] In this embodiment, the MCU chip U1 is preferably an STM32G474RET6.

[0025] In this embodiment, preferably, the switching control MOSFET Q2 is model AO3400A.

[0026] In this embodiment, preferably, the switching control MOS transistor Q1 is model AO3400A.

[0027] In this embodiment, the diode D3 is preferably of type IN4148WT.

[0028] In this embodiment, preferably, the first pin of the MCU chip U1 is used to output a PWM signal. When the output is high, the MOSFET Q2 is turned on, which in turn turns off the MOSFET Q1, so that the circuit outputs a high level through the diode D3. At the same time, the PWM high-level signal is redundantly output through the resistor R3.

[0029] In this embodiment, preferably, when any component in the push-pull circuit fails, the PWM signal output from pin 1 of the MCU chip U1 can be directly output externally through resistor R3, achieving a redundancy backup function. In a specific implementation case, when the system is in operating mode, the working principle is as follows:

[0030] Normal operating state: (PWM is adjusted by duty cycle: at a fixed frequency, the average output voltage is adjusted by changing the time ratio of high level and low level (duty cycle)). The PWM_OUT output of pin 1 of MCU chip U1 outputs a high level PWM output, which is given to pin 1 of Q2 through resistor R7. This controls pins 2 and 3 of Q2 to conduct. After the 5V voltage signal at the connection position of pin 3 of Q2 and R4 and R5 is connected to ground, the level on pin 1 of Q1 is also grounded, which disconnects pins 2 and 3 of Q1. Thus, the 5V voltage signal is output to the outside through R2 and pin 2 of D3.

[0031] The PWM_OUT output of pin 1 of MCU chip U1 outputs a low-level PWM signal, which is then supplied to pin 1 of Q2 via resistor R7. This disconnects pins 2 and 3 of Q2. The 5V voltage signal is supplied to pin 1 of Q1 via resistors R4 and R5, which then connects pins 2 and 3 of Q1. This connects the 5V voltage signal at the connection point between pin 3 of Q1 and R2 to ground, thus making pin 2 of D3 output a low level.

[0032] Failure working state: (any of the push-pull circuit components R7, R8, Q2, R4, R2, R5, R6, Q1, D3 fails) The PWM high and low level output of pin 1 of MCU chip U1 is directly output to the outside through resistor R3.

Claims

1. A push-pull redundant backup circuit for ESC and servo control signals of an unmanned aerial vehicle (UAV), characterized in that, include: MCU chip U1, switch control MOSFET Q2, switch control MOSFET Q1, and diode D3; The first pin of the MCU chip U1 is connected to the second pin of the diode D3 through resistor R3; The first pin of diode D3 is connected to a 5V voltage signal through resistor R2; The first pin of the MCU chip U1 is connected to the first pin of the MOSFET Q2 through resistor R7, the first pin of the MOSFET Q2 is grounded through resistor R8, and the third pin of the MOSFET Q2 is connected to a 5V voltage signal through resistor R4. The third pin of the MOSFET Q2 is connected to the first pin of the MOSFET Q1 through resistor R5. The first pin of the MOSFET Q1 is grounded through resistor R6. The third pin of the MOSFET Q1 is connected to the first pin of the diode D3.

2. The push-pull redundant backup circuit for UAV ESC and servo control signals according to claim 1, characterized in that, The MCU chip U1 is model STM32G474RET6.

3. The push-pull redundant backup circuit for UAV ESC and servo control signals according to claim 1, characterized in that, The switching control MOSFET Q2 is model AO3400A.

4. The push-pull redundant backup circuit for UAV ESC and servo control signals according to claim 1, characterized in that, The switching control MOSFET Q1 is model AO3400A.

5. The push-pull redundant backup circuit for UAV ESC and servo control signals according to claim 1, characterized in that, The diode D3 is model number IN4148WT.

6. The push-pull redundant backup circuit for UAV ESC and servo control signals according to claim 1, characterized in that, Pin 1 of the MCU chip U1 is used to output a PWM signal. When the output is high, it controls MOSFET Q2 to turn on, which in turn controls MOSFET Q1 to turn off, so that the circuit outputs a high level through diode D3. At the same time, the PWM high-level signal is redundantly output through resistor R3.

7. The push-pull redundant backup circuit for UAV ESC and servo control signals according to claim 1, characterized in that, When any component in the push-pull circuit fails, the PWM signal output from pin 1 of the MCU chip U1 can be directly output to the outside through resistor R3 to achieve redundancy backup function.

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