Endoscope electric handle control circuit

Abstract

The utility model relates to a control circuit of an electric handle of an endoscope, and relates to circuit design of electric equipment. The circuit comprises a power management module, a control module, an input module and an output driving module. The power management module provides stable voltage output through the high-side switching circuit and the voltage reduction and stabilization circuit, suppresses high-frequency noise through magnetic bead filtering, and guarantees the electromagnetic compatibility of the circuit. The control module is composed of a main control chip and is responsible for processing signals from the input module (the rocker and the key) and generating control signals. The input module converts user operation into analog signals or digital signals and transmits the analog signals or the digital signals to the control module. And the output driving module drives loads, such as a steering engine and an LED, according to the control signal, so that accurate operation control is realized. The circuit improves the stability, reliability and control precision of electric equipment through efficient power management, flexible control, anti-interference design and precise driving, and is suitable for various electric handles and equipment control applications.

Description

Technical Field

[0001] The utility model relates to a control circuit for an electric handle of an endoscope, in particular to a circuit design for power management, signal control and load driving in electric equipment (such as remote control equipment, electric tools, robots, etc.). Background Art

[0002] Electric handles are often used to control the operation of electric equipment. Their functions include not only driving loads but also processing external input signals (such as joysticks and buttons) and transmitting control signals to the corresponding driver modules. However, existing endoscope electric handle control circuits often suffer from low power conversion efficiency, unstable power management, and severe noise interference. Therefore, developing an efficient, stable, and highly anti-interference endoscope electric handle control circuit has become a pressing technical challenge. Utility Model Content

[0003] The purpose of the utility model is to provide an endoscope electric handle control circuit that can effectively solve the above-mentioned problems.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The circuit includes:

[0006] A power management module, comprising an input power interface, a high-side switch circuit, and a buck regulator circuit. The high-side switch circuit is composed of a P-channel MOSFET and a driver transistor for controlling the power on and off. The buck regulator circuit is based on a step-down DC-DC converter design and includes a control chip, a power MOSFET, an inductor, and a filter capacitor for converting the input power into a stable DC output power.

[0007] A control module, comprising a main control chip, which is powered by a power management module and is configured to receive input signals and generate control signals;

[0008] An input module, comprising an analog input device and a digital input device. The analog input device is a rocker or a potentiometer, used to generate analog signals related to the operation; the digital input device is a key, used to trigger specific control logic;

[0009] The output drive module includes a servo drive circuit and a status indication circuit. The servo drive circuit is controlled by the PWM signal of the main control chip, and the status indication circuit controls the lighting and extinguishing of the LED through the GPIO pin of the main control chip.

[0010] Further: the high-side switch circuit includes: a P-channel MOSFET, whose source is connected to the input power supply, the drain is connected to the input end of the step-down voltage regulator circuit, and the gate is controlled to be turned on and off by driving the transistor; an NPN-type transistor, whose collector is connected to the gate of the MOSFET, and is used to adjust the state of the MOSFET according to the control signal.

[0011] Further: the step-down voltage stabilization circuit includes: a control chip for generating a PWM signal to control the switching of the power MOSFET;

[0012] Power MOSFET, whose gate receives the output signal of the control chip and whose drain is connected to the inductor, is used for high-frequency switching to regulate the input voltage;

[0013] The inductor and Schottky diode are connected in series to form an energy transfer path;

[0014] Multi-stage filter capacitors are used to smooth the output voltage and suppress noise.

[0015] Furthermore: the control module includes: a main control chip, which includes multiple analog input pins and digital input pins for receiving signals from the input module; the PWM output of the main control chip is used to drive the servo or motor, and its GPIO pin controls the status indication circuit.

[0016] Further: the input module includes: an analog input path, which includes a resistor voltage divider network for adjusting the signal of the joystick or potentiometer to a voltage range acceptable to the main control chip;

[0017] Digital input path, including pull-up resistors, to maintain the stability of key signals when not triggered.

[0018] Furthermore: the output drive module includes: a state indication circuit, which includes a current limiting resistor and an LED, and the state of the LED is controlled by the GPIO pin of the main control chip;

[0019] The servo drive circuit is connected to the PWM output of the main control chip and is used to adjust the servo position according to the control signal.

[0020] Furthermore: the power management module further includes a magnetic bead component, which is arranged in the input power path and the output power path to suppress high-frequency noise and improve the electromagnetic compatibility (EMC) of the circuit.

[0021] The beneficial effects are:

[0022] With efficient power management: through high-side switching circuit and buck voltage regulation design, it provides stable voltage output to ensure efficient operation of electric equipment.

[0023] Flexible control mode: The main control chip processes analog and digital input signals and flexibly responds to user operations.

[0024] Anti-interference design: Magnetic beads and filter capacitors effectively suppress high-frequency noise in the power supply, ensuring system stability and electromagnetic compatibility.

[0025] Precise output drive: PWM control signal drives loads such as servos to achieve precise operational control. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and accompanying drawings.

[0027] Figure 1 This is the general circuit diagram of the utility model;

[0028] Figure 2 This is the circuit diagram of the power management module of the utility model;

[0029] Figure 3 This is the steering gear control circuit diagram of the utility model;

[0030] Figure 4 This is the circuit diagram of the joystick and buttons of the utility model;

[0031] Figure 5 This is the single chip microcomputer and key circuit diagram of the utility model. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0033] It should be noted that, in the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inside", "outside", "front end", "rear end", "head", "tail", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0034] Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0035] Meanwhile, in the description of the utility model, unless another definite provision and limitation, the term "connect", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect;Can be mechanical connection, also can be electric connection;Can be direct connection, also can be indirectly connected through the intermediate medium. For the ordinary skill in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to the specific circumstances.

[0036] Reference Figure 1-5 For an embodiment of the utility model a kind of endoscope electric handle control circuit,

[0037] As Figure 1 、 Figure 2 ; the system is the switching power supply circuit of endoscope, for driving electric handle;

[0038] The power management module in the circuit is responsible for providing stable voltage output, and controls the on-off of power supply.Power management module is responsible for converting input power into stable output voltage, and manages the on-off of power supply.The design of this module has the advantages of high efficiency, stability, anti-interference, etc., to ensure that the circuit can operate stably under various working conditions.Power management module includes input power interface, high-side switch circuit, voltage reduction and voltage stabilization circuit and power filter part, and the specific description is as follows;

[0039] For input power interface, power management module is first connected to external power supply, such as battery or external adapter, through BATIN interface.The power interface provides unstable power supply voltage, which may include certain voltage fluctuation and noise.Therefore, the design of input power interface needs to ensure effective filtering and protection of external power supply.

[0040] When input voltage: the voltage input through BATIN port usually has a certain range of fluctuation, such as battery voltage or DC voltage provided by external adapter.In order to ensure that the power management module can work stably under different voltage conditions, appropriate filter devices need to be used to reduce high-frequency noise in power supply.

[0041] At the same time, the circuit is also provided with power filter: capacitor (such as C34, C35, C36) and magnetic bead (such as BEAD0805S401A30T) are added to BATIN input end.Capacitor is used to smooth voltage fluctuation, while magnetic bead effectively suppresses high-frequency noise in power supply input path.Through these elements, power management module can obtain more stable input power, reducing the interference of external power supply.

[0042] Regarding the high-side switch circuit: The high-side switch circuit consists of the IR9301 (P-channel MOSFET) and Q8 (9013NPN transistor). Its main function is to regulate the power supply on and off according to the control signal, protecting the circuit from damage caused by overcurrent or reverse voltage, and improving circuit safety.

[0043] For the P-channel MOSFET (IR9301): As a high-side switch, the IR9301 MOSFET's source is connected to the input power supply (BATIN), and its drain is connected to the input of the buck regulator circuit. Its gate is controlled by the collector of Q8 (9013 NPN transistor). When Q8 turns on, the IR9301's gate voltage is pulled low, turning on the MOSFET and allowing current to flow. When Q8 turns off, the IR9301 turns off, cutting off the current.

[0044] Regarding the control signal (MOTO_PWR): The MOTO_PWR signal, sent by the main control chip (STM32F103C8T6), drives Q8 through a pull-up resistor, which determines the on / off state of the IR9301. This design allows the system to flexibly switch the power supply, providing a stable power supply for subsequent circuits.

[0045] This high-side switch circuit effectively controls the power supply on and off, preventing transient overcurrent during startup of the power management module. It also provides reverse polarity protection. The IR9301's body diode blocks current during reverse power connection, preventing damage to the circuit.

[0046] Regarding the buck regulator circuit: The main function of the buck regulator circuit is to convert the high voltage of the input power supply into a stable low voltage suitable for subsequent circuits. This circuit is based on a switching power supply design consisting of the LT1619 control chip and the AO4402 (N-channel MOSFET), and achieves voltage reduction by adjusting the switching duty cycle.

[0047] LT1619 controller: The LT1619 is a highly efficient DC-DC step-down controller that uses current-mode control to stably regulate output voltage. Its PWM output signal controls the switching of the AO4402 MOSFET, thereby regulating current flow. The LT1619 monitors the output voltage through a feedback loop (FB pin) and adjusts the MOSFET switching duty cycle to maintain the output voltage at the set value.

[0048] AO4402 Power MOSFET: The AO4402 is an N-channel enhancement-mode power MOSFET responsible for high-frequency switching. When the LT1619 drives its gate with a PWM signal, the AO4402 switches and controls the flow of current. When it is on, the input current flows through inductor L4, storing energy. When it is off, the inductor releases energy, continuing to supply power to the load.

[0049] Filter inductance (L4) and diode (D7): Inductance L4 is used to store and transfer energy, and Schottky diode D7 provides a freewheeling path to ensure smooth current flow to the load. Inductance and diode work together to ensure stable output voltage.

[0050] At the same time, in order to reduce the high frequency noise in the power supply path, the power management module of the utility model uses magnetic beads (such as BEAD0805S401A30T) in the input and output power supply path. Magnetic beads can effectively attenuate high frequency noise and convert it into heat, avoiding noise signals from being transmitted to subsequent circuits and ensuring the electromagnetic compatibility (EMC) of the power management module.

[0051] Position of magnetic beads: Magnetic beads are placed on the power input (BATIN) and output path (DJ_PWR1) to form an effective noise filtering and suppression mechanism.

[0052] Filtering capacitor: The filtering capacitor (such as C34, C35, C36, etc.) in the power supply path not only suppresses high frequency noise, but also smooths voltage fluctuations, making the power output more stable.

[0053] The control module in the circuit system includes a main control chip, which is powered by the power management module and is used to receive input signals and generate control signals. The control module is composed of a main control chip STM32F103C8T6 and is the logical core of the entire circuit. The main control chip processes external signals and performs control operations through multiple input and output pins.

[0054] Specific input signal processing: The control module receives signals (joystick or button) from the input module. The joystick or potentiometer inputs analog signals to the ADC channel of the main control chip, while the button inputs digital signals. According to these signals, the main control chip generates corresponding control signals;

[0055] And execute output signal processing: The main control chip generates PWM signals according to the processed input signals, which are used to control the movement of loads such as servos. In addition, the main control chip also controls the state indication circuit (such as LED) through the GPIO pin, providing feedback on the running state of the device.

[0056] Input module, the input module includes analog input device and digital input device, analog input device: the joystick or potentiometer converts the user's operation into analog signals through ADC_X and ADC_Y signals and inputs them to the main control chip. The circuit adjusts the analog signal to the voltage range acceptable by the main control chip through a resistance voltage dividing network (such as R45, R46).

[0057] Analog digital input: Buttons (such as K1 and K2) are connected to the GPIO pins of the main control chip through pull-up resistors. When the user presses the button, the main control chip receives the digital signal and processes it according to the preset logic.

[0058] Output driver module: The output driver module is responsible for driving external loads such as servos, LEDs, etc. according to control signals.

[0059] Servo drive: The main control chip controls the servo drive modules (DJ_CTR1 and DJ_CTR2) through PWM signals to achieve precise control of the servo. The duty cycle of the PWM signal determines the rotation angle of the servo.

[0060] Status Indicator Circuit: This circuit, composed of an LED and a current-limiting resistor (such as R52), displays the device's operating status to the user. The LED's on / off status is controlled by the GPIO pin of the main control chip.

[0061] The step-down voltage stabilization circuit includes: a control chip for generating a PWM signal to control the switching of the power MOSFET;

[0062] Power MOSFET, whose gate receives the output signal of the control chip and whose drain is connected to the inductor, is used for high-frequency switching to regulate the input voltage;

[0063] The inductor and Schottky diode are connected in series to form an energy transfer path;

[0064] Multi-stage filter capacitors are used to smooth the output voltage and suppress noise.

[0065] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An endoscope electric handle control circuit, characterized in that: The circuit includes: a power management module, which includes an input power interface, a high-side switch circuit and a buck regulator circuit. The high-side switch circuit is composed of a P-channel MOSFET and a drive transistor, and is used to control the on and off of the power supply; the buck regulator circuit is based on a step-down DC-DC converter design, including a control chip, a power MOSFET, an inductor and a filter capacitor, and is used to convert the input power into a stable DC output power; a control module, which includes a main control chip, which is powered by the power management module, and is used to receive input signals and generate control signals; an input module, which includes an analog input device and a digital input device. The analog input device is a joystick or a potentiometer, and is used to generate an operation analog signal; the digital input device is a button, and is used to trigger the control logic; an output drive module, which includes a servo drive circuit and a status indication circuit. The servo drive circuit is controlled by a PWM signal from the main control chip, and the status indication circuit controls the lighting and extinguishing of the LED through the GPIO pin of the main control chip.

2. The endoscope electric handle control circuit according to claim 1, characterized in that: The high-side switch circuit includes: a P-channel MOSFET, whose source is connected to the input power supply, the drain is connected to the input end of the step-down voltage regulator circuit, and the gate is controlled to be turned on and off by a driving transistor; an NPN transistor, whose collector is connected to the gate of the MOSFET, and is used to adjust the state of the MOSFET according to the control signal.

3. The endoscope electric handle control circuit according to claim 2, characterized in that: The buck-stabilizing circuit includes: a control chip for generating a PWM signal to control the switching of a power MOSFET; a power MOSFET whose gate receives the output signal of the control chip and whose drain is connected to an inductor for high-frequency switching to regulate the input voltage; an inductor and a Schottky diode connected in series to form an energy transfer path; and multi-stage filter capacitors for smoothing the output voltage and suppressing noise.

4. The endoscope electric handle control circuit according to claim 3, characterized in that: The control module includes: a main control chip, which includes multiple analog input pins and digital input pins for receiving signals from the input module; the PWM output of the main control chip is used to drive the servo or motor, and its GPIO pin controls the status indication circuit.

5. The endoscope electric handle control circuit according to claim 4, characterized in that: The input module includes: an analog input path, which includes a resistor divider network for adjusting the signal of the joystick or potentiometer to a voltage range acceptable to the main control chip; a digital input path, which includes a pull-up resistor for maintaining the stability of the key signal when it is not triggered.

6. The endoscope electric handle control circuit according to claim 5, characterized in that: The output drive module includes: a status indication circuit, which includes a current limiting resistor and an LED, and the status of the LED is controlled by the GPIO pin of the main control chip; a servo drive circuit, connected to the PWM output of the main control chip, for adjusting the servo position according to the control signal.

7. The endoscope electric handle control circuit according to claim 6, characterized in that: The power management module further includes a magnetic bead element, which is arranged in the input power path and the output power path to suppress high-frequency noise and improve the electromagnetic compatibility of the circuit.

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