WO2022134813A1

WO2022134813A1 - Switch control circuit and endoscope system

Info

Publication number: WO2022134813A1
Application number: PCT/CN2021/125600
Authority: WO
Inventors: 李中华; 施金秋; 王幸敏; 林海凤
Original assignee: 微创优通医疗科技(嘉兴)有限公司
Priority date: 2020-12-23
Filing date: 2021-10-22
Publication date: 2022-06-30
Also published as: CN213601084U

Abstract

Provided are a switch control circuit and an endoscope system. The switch control circuit comprises a power source switch, an electronic switch and a microcontroller, wherein a first end of the power source switch is grounded, and a second end of the power source switch is electrically connected to a first input end of the microcontroller; a second input end of the microcontroller is electrically connected to an output end of a controlled circuit system, and a first output end of the microcontroller is electrically connected to an input end of the controlled circuit system; and a first input end of the electronic switch is electrically connected to a power source, a second input end of the electronic switch is electrically connected to a second output end of the microcontroller, and an output end of the electronic switch is electrically connected to the input end of the controlled circuit system. The switch control circuit can reduce power consumption, prolong the life time of a power source and maintain the integrity of storage data of a controlled circuit system at all times.

Description

Switch control circuit and endoscope system

technical field

The present invention relates to the technical field of electronic equipment, and in particular, to a switch control circuit and an endoscope system.

Background technique

The traditional operating modes of electronic equipment include power-controlled on-off mode and processor-controlled on-off mode. The switch mode of the power supply control is that the switch directly acts on the power supply. Taking an electric fan as an example, when the power is turned on, the electric fan works; when the power is cut off, the electric fan stops working. The working state of the electric fan is directly acted on by the switch on the power supply, and there is no data operation. In the switch mode controlled by the processor, the switch acts on the processor. Traditional processor-based electronic devices, such as hand-held electronic devices, all have low power consumption requirements and associated data write protection requirements. The processor-based electronic device needs to receive external information in real time, and the device is always in a working state. Taking a mobile phone as an example, it has a built-in battery. When the screen is off, the processor runs in a low-power mode. When the phone is turned on and off, the power button of the mobile phone acts on the processor, and the processor controls the peripheral circuits.

On the other hand, devices that work online based on processors, such as hand-held electronic endoscopes, are required to work when powered on, and to maintain the longest standby life of the battery when powered off, and also require that no data is received when powered off, and data is written when powered on. into the memory. If the power-controlled power-on/off method is adopted, the power is directly powered off when the device writes data to the memory, which will cause the data writing to fail. Therefore, for this type of equipment, the trigger of the power switch is required to act on the processor, but there is also a problem. This method requires the processor to work all the time. Although the processor can work in a low-power mode, it also consumes battery power all the time.

In view of the above situation, a microcontroller MCU can be used to control the turn-on and turn-off of the circuit. For example, in the scheme disclosed in Chinese patent application CN106374897 B, the main equipment and the equipment circuit share one network power supply, the switch signal is detected by the circuit, and then the electronic switch is controlled to supply power to the main equipment, and the same is true when shutting down. However, the above solution can only complete the delayed start-up, and the feedback signal of the main device cannot be obtained during the delayed shutdown, that is, it belongs to open-loop control. In addition, additional redundant circuits are required, which increases design cost and reduces product stability.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a switch control circuit and an endoscope system, which can reduce power consumption, prolong the battery life of the power supply, and maintain the integrity of the stored data of the controlled circuit system at any time.

In order to achieve the above object and other related objects, the present invention provides a switch control circuit, including a power switch, an electronic switch and a microcontroller; wherein,

The first end of the power switch is grounded, the second end of the power switch is electrically connected to the first input end of the microcontroller, and the power switch provides a power-on signal or a power-off signal to the microcontroller;

The second input end of the microcontroller is electrically connected to the output end of the controlled circuit system, the first output end of the microcontroller is electrically connected to the input end of the controlled circuit system, and the power switch provides When the power-on signal is turned on, the microcontroller outputs a high-level enable control signal; when the power switch provides a shutdown signal, the microcontroller outputs a low-level notification signal, and the controlled circuit system receives all the signals. The notification signal is processed and the operation is performed, and after the operation is completed, a low-level feedback signal is output to the microcontroller, and the microcontroller outputs a low-level enable control signal according to the low-level feedback signal;

The first input terminal of the electronic switch is electrically connected to the power supply, the second input terminal of the electronic switch is electrically connected to the second output terminal of the microcontroller, and the output terminal of the electronic switch is electrically connected to the controlled circuit The input end of the system is electrically connected, and the electronic switch receives an enable control signal output by the microcontroller, and controls the power-on of the controlled circuit system according to the enable control signal.

Optionally, in the switch control circuit, the electronic switch includes: a first resistor, a second resistor, a third resistor, a triode and a field effect transistor, wherein,

The drain of the field effect transistor is electrically connected to the input end of the controlled circuit system, and is used for controlling the power-on of the controlled circuit system;

The first end of the first resistor is electrically connected to the power supply and the source of the field effect transistor, respectively, and the second end of the first resistor is electrically connected to the first end of the second resistor;

The first end of the second resistor is electrically connected to the gate of the field effect transistor, the second end of the second resistor is electrically connected to the collector of the triode, the first resistor and the second The resistor forms a voltage divider circuit to provide a turn-on voltage for the field effect transistor;

The base of the triode is electrically connected to the second end of the third resistor, the emitter of the triode is grounded, and the triode controls the on and off of the voltage divider circuit;

The first end of the third resistor is electrically connected to the second output end of the microcontroller for current limiting and transmitting the enabling control signal of the microcontroller to the base of the triode.

Optionally, in the switch control circuit, the switch control circuit further includes a first capacitor and a second capacitor, wherein,

The first end of the first capacitor is electrically connected to the microcontroller, the second end of the first capacitor is grounded; the first end of the second capacitor is electrically connected to the microcontroller, and the first end of the first capacitor is electrically connected to the microcontroller. The second terminal of the two capacitors is grounded.

Optionally, in the switch control circuit, the microcontroller is set with a power-on duration threshold, the power switch outputs a power-on signal, and the duration of the power-on signal is not less than the power-on duration. When the threshold value is reached, the microcontroller outputs a high-level enable control signal to the electronic switch.

Optionally, in the switch control circuit, the microcontroller sets a shutdown duration threshold, the power switch outputs a shutdown signal, and the shutdown signal duration is not less than the shutdown duration. When the threshold is reached, the microcontroller outputs a low-level notification signal to the controlled circuit system.

Optionally, in the switch control circuit, the switch control circuit further includes a fourth resistor, a first end of the fourth resistor is electrically connected to the input end of the controlled circuit system, and the fourth resistor is electrically connected to the input end of the controlled circuit system. The second end of the resistor is electrically connected to the first output end of the microcontroller, and the fourth resistor provides a pull-up level signal for the notification signal output by the microcontroller.

Optionally, in the switch control circuit, the switch control circuit further includes a fifth resistor, the first end of the fifth resistor is electrically connected to the output end of the controlled circuit system, and the fifth resistor is electrically connected to the output end of the controlled circuit system. The second end of the resistor is electrically connected to the second input end of the microcontroller, and the fifth resistor provides a pull-up level signal for the feedback signal output by the controlled circuit system.

Optionally, in the switch control circuit, the controlled circuit system includes a safety monitoring mechanism, and when the controlled circuit system is turned on and the safety monitoring mechanism is abnormal, the controlled circuit system Actively output a low-level feedback signal, so that the switch control circuit enters the shutdown process.

Optionally, in the switch control circuit, the power source is a battery, and when the controlled circuit system is turned on and the battery power is too low, the controlled circuit system actively outputs a low level. The feedback signal makes the switch control circuit perform the shutdown process.

In order to achieve the above purpose and other related purposes, the present invention also provides an endoscope system, including an endoscope, which images the body of an object under inspection and outputs an imaging signal; is provided with the above-mentioned switch control circuit, which controls the The power-on of the controlled circuit system; the controlled circuit system, which is electrically connected with the switch control circuit and the endoscope, and processes the imaging signal to generate a display image signal; a display device, which is connected with the controlled circuit. The control circuit system is electrically connected to display the observation image based on the image signal for display.

To sum up, the switch control circuit provided by the present invention provides a power-on signal or a power-off signal to the microcontroller through the power switch, and when the power switch provides a power-on signal, the microcontroller outputs a high level When the power switch provides a shutdown signal, the microcontroller outputs a low-level notification signal, and the controlled circuit system receives the low-level notification signal and performs operation processing. After the operation processing is completed, a low-level feedback signal is output to the microcontroller, and the microcontroller outputs a low-level enable control signal according to the low-level feedback signal; the electronic switch receives the high-level and control the power-on of the controlled circuit system according to the high-level enable control signal. That is, the switch control circuit belongs to closed-loop control, which can reduce power consumption, prolong the battery life of the power supply, and maintain the integrity of the stored data of the controlled circuit system at any time.

Description of drawings

Fig. 1 is a circuit block diagram of a power-controlled switch mode;

2 is a circuit block diagram of a processor-controlled switch mode;

3 is a block diagram of a switch control circuit provided in an embodiment of the present invention;

FIG. 4 is a structural diagram of a switch control circuit provided in an embodiment of the present invention.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

The traditional operating modes of electronic equipment include power-controlled on-off mode and processor-controlled on-off mode. FIG. 1 shows a circuit block diagram of a power-on-off mode of power control, in which the switch directly acts on the power source. In the power-controlled on-off mode, a first end of the power switch is electrically connected to a power source (eg, a battery), and a second end of the power switch is electrically connected to the controlled circuit system (eg, a processor circuit). The advantage of this method is that the battery does not consume power, the storage time is prolonged, the circuit does not work during storage, and there is no abnormal risk; the disadvantage is that there is a risk of failure to write data and damage to the storage device. FIG. 2 shows a circuit block diagram of a switch mode controlled by a processor, in which the switch directly acts on the processor. In the power-on/off mode controlled by the processor, the first end of the controlled circuit system (such as a processor circuit) is electrically connected to a power source (such as a battery), and the second end of the controlled circuit system is connected to the The power switch is electrically connected. The advantage of this method is that data integrity is preserved; the disadvantage is that the processor is constantly consuming power during shutdown; there is a certain risk during data storage.

In order to reduce power consumption, prolong the battery life of the power supply, and at the same time maintain the integrity of the stored data of the controlled circuit system at any time, the present invention provides a switch control circuit, which uses an electronic switch between the power supply and the controlled system. In the control mode, the switching signal of the electronic switch is completed by a microcontroller. The working current of the microcontroller is not more than 6 microamps, which can be understood as no current consumption, and the power switch used for interaction acts on the microcontroller. The switch control circuit has both the advantages of the power-controlled on-off mode and the processor-controlled on-off mode, and at the same time avoids their disadvantages.

3 and 4, the switch control circuit includes a power switch, an electronic switch and a microcontroller. The microcontroller (Microcontroller Unit, MCU) has the characteristics of low power consumption and small size. For example, the LTC2950-1 type microcontroller MCU of Linear Technology has a volume of 3mm*2mm*2mm.

The first end of the power switch SA is grounded, the second end of the power switch SA is electrically connected to the first input end of the microcontroller MCU, and the power switch SA provides a power-on signal or a power-off signal to the microcontroller Controller MCU. When the controlled circuit system is turned off, the power switch SA is triggered to output a power-on signal; when the controlled circuit system is turned on, the power switch SA is triggered to output a power-off signal.

The second input terminal Power_OFF_KILL of the microcontroller MCU is electrically connected to the output terminal of the controlled circuit system, and the first output terminal Power_OFF_INT of the microcontroller MCU is electrically connected to the input terminal of the controlled circuit system. The second input terminal Power_OFF_KILL of the microcontroller MCU performs external signal input detection for the MCU; the first output terminal Power_OFF_INT of the microcontroller MCU provides external signals (ie, output signals) for the MCU. The switch control circuit further includes a first capacitor C11 and a second capacitor C12, wherein a first end of the first capacitor C11 is electrically connected to the microcontroller MCU, and a second end thereof is grounded; the second capacitor The first end of C12 is electrically connected to the microcontroller MCU, and the second end of the C12 is grounded. The first capacitor C11 is configured for the microcontroller MCU to detect the time when the power switch SA outputs the power-on signal and the duration of the power-on signal; the second capacitor C12 is configured for the microcontroller MCU to detect the power supply The switch SA outputs the time and duration of the shutdown signal. The microcontroller MCU is set with a power-on duration threshold and a power-off duration threshold. When the power switch SA is pressed to trigger the output of a power-on signal, and the duration of the power-on signal is not less than the power-on duration threshold, the microcontroller MCU outputs a high-level enable control signal (Power_EN signal) to the electronic switch. The power-on duration threshold is greater than or equal to 1s, preferably 1s. When the power switch SA is pressed to trigger the output of a shutdown signal, and the duration of the shutdown signal is not less than the shutdown duration threshold, the microcontroller MCU outputs a low-level notification signal to the control circuit system. The shutdown duration threshold is greater than or equal to 1s, preferably 1s.

When the microcontroller MCU outputs a low-level notification signal, the controlled circuit system receives the low-level notification signal and performs operation processing. After the operation processing is completed, the controlled circuit system outputs a low-level feedback signal to the microcontroller MCU, and the microcontroller MCU outputs a low-level enable control according to the low-level feedback signal. Signal.

The first input terminal of the electronic switch is electrically connected to the power supply, the second input terminal of the electronic switch is electrically connected to the second output terminal of the microcontroller, and the output terminal of the electronic switch is electrically connected to the controlled circuit The input terminals of the system are electrically connected. The electronic switch receives the enable control signal, and controls the power-on of the controlled circuit system according to the enable control signal. The first input terminal is a power input terminal Power_IN, which supplies power to the controlled circuit system and the switch control circuit in this embodiment, respectively. The output terminal of the electronic switch is the power output terminal Power_OUT, and the power output terminal Power_OUT supplies power to the controlled circuit system, and is provided by the power input terminal Power_IN when the field effect transistor Q1 is turned on.

The electronic switch includes: a first resistor R11, a second resistor R12, a third resistor R13, a transistor Q2 and a field effect transistor Q1, wherein the drain of the field effect transistor Q1 and the input end of the controlled circuit system Electrical connection is used to control the power-on of the controlled circuit system; the first end of the first resistor R11 is electrically connected to the power supply and the source of the field effect transistor Q1, respectively, and the first resistor R11 The second end of the second resistor R12 is electrically connected to the first end of the second resistor R12; the first end of the second resistor R12 is electrically connected to the gate of the field effect transistor Q1, and the second end of the second resistor R12 The terminal is electrically connected to the collector of the transistor Q2, and the first resistor R11 and the second resistor R12 form a voltage divider circuit to provide a turn-on voltage for the field effect transistor Q1; the base of the transistor Q2 is connected to the The second end of the third resistor R13 is electrically connected, the emitter of the transistor Q2 is grounded, and the transistor Q2 controls the on and off of the voltage divider circuit; the first end of the third resistor R13 is connected to the The second output end of the microcontroller MCU is electrically connected for current limiting, and transmits the enabling control signal of the microcontroller MCU to the base of the transistor Q2.

When the microcontroller MCU outputs a high-level enable control signal, the high-level enable control signal is sent to the base of the transistor Q2 through the third resistor R13, and the transistor Q2 acts as a switch effect. Under the action of the high-level enable control signal, the transistor Q2 is turned on, and the voltage divider circuit is also turned on, so that the voltage divider circuit performs voltage sampling and provides the turn-on voltage for the field effect transistor Q1, so The gate of the effect transistor Q1 is connected to the turn-on voltage. That is, the effect transistor Q1 is turned on, so that the electronic switch is turned on, thereby powering on the controlled circuit system. After the controlled circuit system is powered on, it will output a system signal to the power switch SA within a certain time (for example, 1.5s), and the power switch SA will lock the state after receiving the system signal. If the power switch SA does not receive a system signal within a certain period of time, the power switch will automatically trip, indicating that the switch control circuit or the controlled circuit system is abnormally turned on.

When the microcontroller MCU outputs a low-level enable control signal, the low-level enable control signal is sent to the base of the transistor Q2 through the third resistor R13. Due to the low-level enable control signal The control signal causes the transistor Q2 to be turned off, the voltage divider circuit stops voltage sampling, and the effect transistor Q1 is also turned off, thereby stopping powering on the controlled circuit system.

The switch control circuit further includes a fourth resistor R14, the first end of the fourth resistor R14 is electrically connected to the input end of the controlled circuit system, and the second end of the fourth resistor R14 is connected to the micro-controller The first output terminal Power_OFF_INT of the microcontroller MCU is electrically connected, and the fourth resistor R14 provides a pull-up level signal for the notification signal output by the microcontroller. When the controlled circuit system has been turned on, the power switch SA is triggered to output a shutdown signal, and the microcontroller MCU outputs a low-level notification signal to notify the processor of the controlled circuit system to perform a shutdown operation. The controlled circuit system quits the data writing operation in time after receiving the notification signal, and completes the data saving work. After the power switch SA is triggered again to output a power-on signal, and the controlled circuit system is activated again, the notification signal is pulled up to a high level within a certain period of time through the fourth resistor R14.

The switch control circuit further includes a fifth resistor R15, the first end of the fifth resistor R15 is electrically connected to the output end of the controlled circuit system, and the second end of the fifth resistor R15 is connected to the micro-controller The second input terminal Power_OFF_KILL of the controller MCU is electrically connected, and the fifth resistor R15 provides a pull-up level signal for the feedback signal output by the controlled circuit system. When the controlled circuit system needs to be shut down by the main control on the operation interface (for example, it is detected that the power of the system is low), the control circuit system controls the feedback signal to be at a low level, and the shutdown process can be entered. When the controlled circuit system is in the power-on state, it is detected that the power switch SA is triggered to output a shutdown signal, and the low-level notification signal informs the controlled circuit system processor to exit the data writing operation and complete the storage. After the writing operation and the saving work, the feedback signal is set to a low level, and the switch control circuit is notified to enter the shutdown process. When the power switch SA is triggered again to output the power-on signal, the microcontroller MCU outputs a high-level enable control signal to turn on the electronic switch for power supply. The feedback signal is pulled up to a high level within a certain time.

The controlled circuit system may include safety monitoring mechanisms, such as high temperature detection, working current detection, and the like. When the controlled circuit system is in a power-on state and the safety monitoring mechanism is abnormal, the controlled circuit system actively outputs a low-level feedback signal, so that the switch control circuit enters a shutdown process.

The power source may be a battery, and when the controlled circuit system is turned on and the battery power is too low, the controlled circuit system actively outputs a low-level feedback signal to make the switch control circuit shut down process.

The working process of the switch control circuit includes a startup process and a shutdown process, wherein the startup process is specifically:

When the power switch SA is pressed, the microcontroller MCU detects the power-on signal and outputs a high-level enable control signal after detecting that the duration of the power-on signal is not less than the power-on duration threshold, and the Power_OUT terminal receives current flow, The controlled circuit system is powered on, the whole machine is running, the controlled circuit system sets the feedback signal to a high level, and the startup process is completed.

The shutdown process of the switch control circuit includes two cases, specifically:

Press the button to trigger the shutdown process:

The power switch SA is pressed, the microcontroller MCU detects the shutdown signal, and after detecting that the duration of the shutdown signal is not less than the shutdown duration threshold, it outputs a low-level notification signal to notify the controlled circuit system to exit the data After the write operation is completed and the storage is completed, the controlled circuit system sets the feedback signal to a low level, and the microcontroller MCU receives the low-level feedback signal and outputs a low-level enable control signal to enable When the electronic switch is disconnected, the power-on of the controlled circuit system is stopped, and the shutdown process is completed.

Actively enter the shutdown process:

When the controlled circuit system is powered by a battery, or the controlled circuit system has mechanisms such as safety detection, once it is detected that the switch control circuit and the controlled circuit system operate abnormally, the controlled circuit system can actively withdraw from the data writing operation and complete the saving. After that, the controlled circuit system actively controls the feedback signal to be low level, and the microcontroller MCU receives the low level feedback signal and outputs a low level enable control signal to turn off the electronic switch and stop Power on the controlled circuit system and complete the shutdown process.

The switch control circuit provided by the present invention adopts the control method of an electronic switch between the power supply and the controlled system, and the switching signal of the electronic switch is completed by a microcontroller, which can reduce power consumption, prolong the battery life of the power supply, and also The integrity of the stored data of the controlled circuit system can be maintained at any time.

In addition, the present invention also provides an endoscope system, including an endoscope, which images the body of an object to be inspected and outputs an imaging signal; the switch control circuit is provided to control the power-on of the controlled circuit system a controlled circuit system, which is electrically connected to the switch control circuit and the endoscope, and processes the imaging signal to generate an image signal for display; a display device, which is electrically connected to the controlled circuit system, and displays a display based on The observation image of the image signal for display.

Since the endoscope system has the switch control circuit provided by the present invention, it also has the characteristics of low power consumption, long battery life, and maintaining the integrity of the stored data of the controlled circuit system at any time.

In addition, it should be noted that unless otherwise specified or pointed out, the terms "first", "second" and other descriptions in the specification are only used to distinguish various components, elements, steps, etc. in the specification, rather than to indicate each The logical relationship or sequence relationship between components, elements, steps, etc.

It should be understood that, although the present invention has been disclosed above with preferred embodiments, the above embodiments are not intended to limit the present invention. For any person skilled in the art, without departing from the scope of the technical solution of the present invention, many possible changes and modifications can be made to the technical solution of the present invention by using the technical content disclosed above, or modified into equivalents of equivalent changes. Example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention still fall within the protection scope of the technical solutions of the present invention.

It is also to be understood that this invention is not limited to the particular methods, compounds, materials, fabrication techniques, uses and applications described herein, which may vary. It should also be understood that the terminology described herein is used to describe particular embodiments only, and not to limit the scope of the present invention. It must be noted that as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Thus, for example, reference to "a step" or "a means" means a reference to one or more steps or means, and may include sub-steps as well as sub-means. All conjunctions used should be understood in their broadest sense. Accordingly, the word "or" should be understood to have the definition of logical "or" rather than the definition of logical "exclusive or" unless the context clearly dictates otherwise. A structure described herein is to be understood to also refer to functional equivalents of the structure. Language that can be interpreted as approximate should be understood as such, unless the context clearly dictates otherwise.

Claims

A switch control circuit is characterized by comprising a power switch, an electronic switch and a microcontroller; wherein,

The first end of the power switch is grounded, the second end of the power switch is electrically connected to the first input end of the microcontroller, and the power switch provides a power-on signal or a power-off signal to the microcontroller;

The second input end of the microcontroller is electrically connected to the output end of the controlled circuit system, the first output end of the microcontroller is electrically connected to the input end of the controlled circuit system, and the power switch provides When the power-on signal is turned on, the microcontroller outputs a high-level enable control signal; when the power switch provides a shutdown signal, the microcontroller outputs a low-level notification signal, and the controlled circuit system receives all the signals. After the operation processing is completed, a low-level feedback signal is output to the microcontroller, and the microcontroller outputs a low-level enable control signal according to the low-level feedback signal. ;

The first input terminal of the electronic switch is electrically connected to the power supply, the second input terminal of the electronic switch is electrically connected to the second output terminal of the microcontroller, and the output terminal of the electronic switch is electrically connected to the controlled circuit The input end of the system is electrically connected, and the electronic switch receives the enable control signal output by the microcontroller, and controls the power-on of the controlled circuit system according to the enable control signal.
The switch control circuit according to claim 1, wherein the electronic switch comprises: a first resistor, a second resistor, a third resistor, a triode and a field effect transistor, wherein,

The drain of the field effect transistor is electrically connected to the input end of the controlled circuit system, and is used for controlling the power-on of the controlled circuit system;

The first end of the first resistor is electrically connected to the source of the field effect transistor and the power supply, respectively, and the second end of the first resistor is electrically connected to the first end of the second resistor;

The first end of the second resistor is electrically connected to the gate of the field effect transistor, the second end of the second resistor is electrically connected to the collector of the triode, the first resistor and the second The resistor forms a voltage divider circuit to provide a turn-on voltage for the field effect transistor;

The base of the triode is electrically connected to the second end of the third resistor, the emitter of the triode is grounded, and the triode controls the on and off of the voltage divider circuit;

The first end of the third resistor is electrically connected to the second output end of the microcontroller for current limiting and transmitting the enabling control signal of the microcontroller to the base of the triode.
The switch control circuit of claim 1, wherein the switch control circuit further comprises a first capacitor and a second capacitor, wherein the first end of the first capacitor is electrically connected to the microcontroller, The second end of the first capacitor is grounded; the first end of the second capacitor is electrically connected to the microcontroller, and the second end of the second capacitor is grounded.
The switch control circuit of claim 3, wherein the microcontroller is provided with a power-on duration threshold, the power switch outputs a power-on signal, and the duration of the power-on signal is not less than the power-on duration During the duration threshold, the microcontroller outputs a high-level enable control signal to the electronic switch.
3. The switch control circuit of claim 3, wherein the microcontroller sets a shutdown duration threshold, the power switch outputs a shutdown signal, and the shutdown signal duration is not less than the shutdown duration When the duration threshold is the value, the microcontroller outputs a low-level notification signal to the controlled circuit system.
The switch control circuit according to claim 1, wherein the switch control circuit further comprises a fourth resistor, the first end of the fourth resistor is electrically connected to the input end of the controlled circuit system, the The second end of the fourth resistor is electrically connected to the first output end of the microcontroller, and the fourth resistor provides a pull-up level signal for the notification signal output by the microcontroller.
The switch control circuit according to claim 1, wherein the switch control circuit further comprises a fifth resistor, the first end of the fifth resistor is electrically connected to the output end of the controlled circuit system, the The second end of the fifth resistor is electrically connected to the second input end of the microcontroller, and the fifth resistor provides a pull-up level signal for the feedback signal output by the controlled circuit system.
The switch control circuit according to claim 1, wherein the controlled circuit system includes a safety monitoring mechanism, and when the controlled circuit system is turned on and the safety monitoring mechanism is abnormal, the controlled circuit system is The circuit system actively outputs a low-level feedback signal, so that the switch control circuit enters a shutdown process.
The switch control circuit according to claim 1, wherein the power source is a battery, and when the controlled circuit system is turned on and the battery power is too low, the controlled circuit system actively outputs a low output The level feedback signal enables the switch control circuit to perform a shutdown process.
An endoscope system, characterized in that it includes an endoscope that images the body of a subject and outputs an imaging signal; a switch control circuit according to any one of claims 1 to 9 is provided, which controls The power-on of the controlled circuit system; the controlled circuit system, which is electrically connected to the switch control circuit and the endoscope, processes the imaging signal, and generates an image signal for display; a display device, which is connected to the endoscope The controlled circuit system is electrically connected, and an observation image based on the display image signal is displayed.