Power supply management circuit for a medical instrument control system

Abstract

The application provides a power supply management circuit of a medical instrument control system and a medical instrument. The circuit comprises: a super capacitor module comprising at least one super capacitor, an input end connected to a power input end of the control system, and the power input end also connected to a load of the control system; a comparator, a first input end of the comparator connected to the power input end of the control system, a second input end connected to an output end of the super capacitor module, and the comparator configured to output a first signal when the voltage of the first input end is higher than or equal to the voltage of the second input end, and output a second signal when the voltage of the first input end is lower than the voltage of the second input end; and a switching switch connected between the output end of the super capacitor module and the load of the control system, a control end of the switching switch connected to the output end of the comparator, and the switching switch configured to be turned off in response to the first signal and turned on in response to the second signal. The application has a simple structure and high reliability.

Description

Technical Field

[0001] This application relates to the field of medical device control technology, specifically to a power supply management circuit for a medical device control system. Background Technology

[0002] In handheld medical device systems, there are instances of abnormal power outages, such as loose power supplies or power failures. In such cases, the control system of the handheld medical device system needs to store critical data during the power outage. This data can be retrieved when power is restored for continued operation or fault analysis.

[0003] Currently, handheld medical device systems cannot use independent UPS (Uninterruptible Power Supply) backup power due to their limited space. Existing methods to prevent the loss of important data after abnormal power outages use ADC (Analog-to-Digital Converter) to collect voltage values ​​for real-time monitoring, which requires the use of the device system's ADC peripheral, and the switching between backup power and normal power supply is complex. Utility Model Content

[0004] To address the problems in the prior art, the purpose of this application is to provide a power management circuit for a medical device control system that does not require the use of the control system's ADC peripheral, and has a simple structure and high reliability.

[0005] This application provides a power management circuit for a medical device control system, including:

[0006] A supercapacitor module includes at least one supercapacitor. The input terminal of the supercapacitor module is connected to the power input terminal of the control system, and the power input terminal is also connected to the load of the control system.

[0007] The comparator has its first input terminal connected to the power input terminal of the control system and its second input terminal connected to the output terminal of the supercapacitor module. The comparator is configured to output a first signal when the voltage at the first input terminal is higher than or equal to the voltage at the second input terminal, and to output a second signal when the voltage at the first input terminal is lower than the voltage at the second input terminal.

[0008] A switching switch is connected between the output of the supercapacitor module and the load of the control system. The control terminal of the switching switch is connected to the output of the comparator. The switching switch is configured to disconnect in response to a first signal and turn on in response to a second signal.

[0009] In some embodiments, the circuit further includes a supercapacitor overvoltage protection chip connected to the output terminal of the supercapacitor module.

[0010] In some embodiments, the supercapacitor module includes two supercapacitors connected in series, and the circuit also includes two supercapacitor overvoltage protection chips, which are respectively connected to the output terminals of the two supercapacitors.

[0011] In some embodiments, a reverse connection protection switch is also provided between the input terminal and the power input terminal of the supercapacitor module.

[0012] In some embodiments, the circuit further includes a first voltage divider module and a second voltage divider module, with the power input terminal connected to the first input terminal of the comparator via the first voltage divider module, and the output terminal of the supercapacitor module connected to the second input terminal of the comparator via the second voltage divider module.

[0013] In some embodiments, the circuit includes two series-connected switching switches, and a resistor is provided between the intermediate node of the two switching switches and the output terminal of the comparator.

[0014] In some embodiments, the circuit further includes a first diode, a second diode, and a current-limiting resistor. The first end of the first diode is connected to the power input terminal, the first end of the second diode is connected to the output terminal of the supercapacitor module, the second ends of the first diode and the second ends of the second diode are connected to the first end of the current-limiting resistor, and the second end of the current-limiting resistor is connected to the output terminal of the comparator.

[0015] In some embodiments, the output of the comparator is also connected to the power failure detection terminal of the controller of the control system.

[0016] In some embodiments, a reverse connection protection switch is provided between the power input terminal and the load of the control system.

[0017] This application also provides a medical device, including the power supply management circuit of the above-described medical device control system.

[0018] The power management circuit for the medical device control system provided in this application has the following advantages:

[0019] This application provides a power management circuit for a medical device control system. By comparing the output voltage of the supercapacitor module with the voltage input to the control system from the conventional power supply in real time through a comparator, the circuit can detect the power failure immediately. Furthermore, by switching the comparator output signal in response to the abnormal power failure, the circuit can switch to the temporary power supply state of the supercapacitor in a timely manner to ensure that important data on site is not lost during abnormal power failures. This circuit does not require the use of the control system's ADC peripheral and has a simple structure and high reliability. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0021] Figure 1 This is a structural block diagram of the power supply management circuit of a medical device control system according to an embodiment of this application;

[0022] Figure 2 This is a schematic diagram showing the connection between the power input terminal and the load of the control system in a power management circuit according to an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the supercapacitor module, power input terminal, and supercapacitor overvoltage protection chip in accordance with an embodiment of this application.

[0024] Figure 4 This is a schematic diagram of the power switching section in a power management circuit according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the power management circuit and controller in cooperation according to an embodiment of this application. Detailed Implementation

[0026] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The words “or” and “or” in the specification may mean “and” or “or”. Although the terms “upper,” “lower,” “between,” etc., may be used in this specification to describe different exemplary features and elements of this application, these terms are used herein only for convenience, such as the orientation according to the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of this application. Although “first” or “second,” etc., are used in this specification to denote certain features, they are merely indicative of function and not as a limitation on the number or importance of specific features.

[0027] like Figure 1As shown in the illustration, this application provides a power management circuit for a medical device control system, including a supercapacitor module M100, a comparator M200, and a switching switch M300. The supercapacitor module M100 includes at least one supercapacitor, and its input terminal is connected to the power input terminal of the control system. The power input terminal is also connected to the load of the control system. The load of the control system may include, for example, the controller chip of the control system, non-volatile memory, and other circuit components in subsequent circuits that require power. The power input terminal of the control system is connected to the conventional power source of the medical device, such as a battery, to power the entire control system. The supercapacitor serves as a backup power source; when there is a stable power input at the power input terminal, the supercapacitor does not need to power the load. Furthermore, by connecting the input terminal of the supercapacitor module M100 to the power input terminal of the control system, the supercapacitor can be charged using a conventional power source.

[0028] The first input terminal of comparator M200 is connected to the power input terminal of the control system, and the second input terminal is connected to the output terminal of the supercapacitor module M100. Comparator M200 is configured to output a first signal when the voltage at the first input terminal is higher than or equal to the voltage at the second input terminal, and to output a second signal when the voltage at the first input terminal is lower than the voltage at the second input terminal. Under normal power supply operation, there is a stable current input at the power input terminal, and the voltage at the power input terminal is higher than or equal to the output voltage of the supercapacitor module M100. At this time, the comparator outputs the first signal. When the control system experiences an abnormal power failure, there is no current input at the power input terminal, causing the voltage at the power input terminal to fall below the output voltage of the supercapacitor module M100. At this time, the comparator outputs the second signal, which is the power failure trigger signal.

[0029] The switching switch M300 is connected between the output of the supercapacitor module M100 and the load of the control system. Specifically, the switching switch M300 controls the on / off state of the current path that supplies power from the supercapacitor to the load of the control system. The control terminal of the switching switch M300 is connected to the output of the comparator M200. The switching switch M300 is configured to open in response to a first signal and open in response to a second signal. Therefore, when no abnormal power failure occurs, the switch M300 disconnects in response to the first signal, and since the power input is connected to the load, the normal power supply continues to supply power to the load. When an abnormal power failure occurs, the switch M300 turns on in response to the second signal, so that the output of the supercapacitor module M100 is connected to the load of the control system. The supercapacitor provides temporary power to the load of the control system. The controller can use the power provided by the supercapacitor to store important field data of the control system (such as power failure retention data and operation log files) in non-volatile memory during the power failure protection time of the temporary power supply. This ensures that after the normal power supply is restored, the stored important field data can be retrieved from the non-volatile memory for continued operation or fault analysis.

[0030] Therefore, this application provides a power management circuit for a medical device control system. By comparing the output voltage of the supercapacitor module with the voltage input to the control system from the conventional power supply in real time through a comparator, the circuit can detect the power failure immediately when an abnormal power failure occurs. Furthermore, by switching the comparator output signal in response to the abnormal power failure, the circuit can switch to the temporary power supply state of the supercapacitor in a timely manner to ensure that important data on site is not lost during abnormal power failures. This circuit does not require the use of the control system's ADC peripheral and has a simple structure and high reliability.

[0031] Figure 2 This is a schematic diagram showing the connection between the power input terminal and the load in a power management circuit according to an embodiment of this application. Figure 2As shown, a reverse connection protection switch Q1 is provided between the power input terminal VCC_IN and the output terminal VCC_OUT of the power management circuit. The output terminal VCC_OUT of the power management circuit is connected to the power input terminal of the load, outputting electrical energy to the load. This reverse connection protection switch Q1 can be, for example, a P-type MOS (Metal-Oxide-Semiconductor Field-Effect Transistor), but this application is not limited to this. Other types of switching transistors or relays can also be used for the reverse connection protection switch Q1. When the voltage at the power input terminal VCC_IN is normal, the reverse connection protection switch Q1 is turned on, connecting the power input terminal VCC_IN and the output terminal VCC_OUT of the power management circuit to supply power to the load. When the power input terminal VCC_IN is reversed, the reverse connection protection switch Q1 is turned off, and the power input terminal VCC_IN and the output terminal VCC_OUT of the power management circuit are not connected.

[0032] In this embodiment, the power supply management circuit also includes a supercapacitor overvoltage protection chip, which is connected to the output terminal of the supercapacitor module to ensure the safe charging and discharging of the supercapacitor, prevent the supercapacitor from being damaged due to the voltage at both ends exceeding its rated value, and at the same time ensure the safe and stable operation of the entire circuit system.

[0033] Figure 3 This is a schematic diagram illustrating the interaction between the supercapacitor module, the power input terminal, and the supercapacitor overvoltage protection chip in this embodiment. Figure 3 As shown, in this embodiment, the supercapacitor module includes two supercapacitors C1 and C2 connected in series. The power supply management circuit also includes two supercapacitor overvoltage protection chips U1 and U2, which are respectively connected to the output terminals of the two supercapacitors C1 and C2. One end of the two supercapacitors C1 and C2 connected in series is grounded, and the other end serves as the input terminal of the supercapacitor module, connected to the power input terminal VCC_IN through a reverse connection protection switch Q2, and serves as the output terminal VCC_CAP for external discharge. The reverse connection protection switch Q2 is located between the power input terminal VCC_IN and the input terminal of the supercapacitor module. When the voltage at the power input terminal VCC_IN is normal, the reverse connection protection switch Q2 is turned on, allowing the current input at the power input terminal to charge the supercapacitors. When the power input terminal is reversed, the reverse connection protection switch Q2 is turned off. The reverse connection protection switch Q2 can be, for example, a P-type MOSFET, but this application is not limited to this; other types of switching transistors or relays can also be used.

[0034] Figure 4 This is a schematic diagram of the power switching section in the power management circuit of this embodiment. For example... Figure 4As shown, in this embodiment, the power management circuit further includes a first voltage divider module and a second voltage divider module. The power input terminal is connected to the first input terminal of the comparator through the first voltage divider module, and the output terminal of the supercapacitor module is connected to the second input terminal of the comparator through the second voltage divider module. The first and second voltage divider modules are used to adjust the voltage at the power input terminal and the output voltage of the supercapacitor module to a range suitable for input to the comparator. Figure 4 As shown, the first voltage divider module includes resistors R6 and R9 connected in series. One end of resistors R6 and R9 is connected to the power input terminal VCC_IN, and the other end is grounded. The node between resistors R6 and R9 is connected to the first input terminal of the comparator. The second voltage divider module includes resistors R7 and R8 connected in series. One end of resistors R7 and R8 is connected to the output terminal VCC_CAP of the supercapacitor module, and the other end is grounded. The node between resistors R7 and R8 is connected to the second input terminal of the comparator. The comparator outputs the signal VCC_DETE, which, depending on the input, is either the first signal or the second signal.

[0035] like Figure 4 As shown, the power management circuit includes two series-connected switching switches Q3 and Q4. A resistor R11 is also provided between the intermediate node of the two switching switches and the output terminal of the comparator. Switches Q3 and Q4 can be, for example, P-type MOSFETs, but this application is not limited to this; other types of switching transistors or relays can also be used, and the number of switching switches can be selected as needed. Resistor R11 ensures that the MOSFET is in the off state when the gate control signal of the switching switch is not activated, and shortens the turn-off time when the MOSFET switches from on to off, thus improving the switching response speed.

[0036] like Figure 4As shown, in this embodiment, the power management circuit further includes a first diode D1, a second diode D2, and a current-limiting resistor R10. The first terminal of the first diode D1 is connected to the power input terminal VCC_IN, the first terminal of the second diode D2 is connected to the output terminal VCC_CAP of the supercapacitor module, and the second terminals of the first and second diodes D2 are connected to the first terminal of the current-limiting resistor R10. The second terminal of the current-limiting resistor R10 is connected to the output terminal of the comparator. The current-limiting resistor R10 provides a stable current limit for subsequent circuits, providing current-limiting protection. A unidirectional diode is used to control the power supply to the downstream circuit. When the power input terminal VCC_IN is normally powered, the first diode D1 is forward-biased, and the second diode D2 is reverse-biased, allowing power to flow from VCC_IN into the downstream circuit. When VCC_IN is powered down, the first diode D1 is reverse-biased, preventing reverse flow of power from the downstream circuit into VCC_IN, while the second diode D2 is forward-biased, allowing power to be supplied to the downstream circuit through VCC_CAP.

[0037] Figure 5 This is a schematic diagram illustrating the interaction between a power management circuit and a controller according to an embodiment of this application. Figure 5 As shown, in this embodiment, the comparator's output is also connected to the power failure detection terminal of the controller in the control system. The controller reads the VCC_DETE signal output by the comparator. When the VCC_DETE signal is the second signal indicating an abnormal power failure, the controller stores important field data in non-volatile memory to ensure that after the normal power supply is restored, the stored important field data can be retrieved from the non-volatile memory for continued operation or fault analysis.

[0038] This application also provides a medical device, including the power management circuit of the aforementioned medical device control system. The medical device may be, for example, a handheld stapler, an endoscope, or a delivery catheter. By incorporating this power management circuit into the medical device, a comparator compares the output voltage of the supercapacitor module with the voltage input to the control system via conventional power in real time. In the event of an abnormal power failure, the circuit can detect the failure immediately. Furthermore, by switching the comparator output signal in response to an abnormal power failure, the circuit can promptly switch to a temporary supercapacitor power supply state, ensuring that critical data is not lost during power outages. This circuit does not require the use of the control system's ADC peripheral and features a simple structure and high reliability.

[0039] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A power supply management circuit of a medical instrument control system, characterized by, include: A supercapacitor module includes at least one supercapacitor, the input terminal of which is connected to the power input terminal of the control system, and the power input terminal is also connected to the load of the control system. A comparator, wherein a first input terminal of the comparator is connected to the power input terminal of the control system, and a second input terminal is connected to the output terminal of the supercapacitor module, the comparator is configured to output a first signal when the voltage at the first input terminal is higher than or equal to the voltage at the second input terminal, and to output a second signal when the voltage at the first input terminal is lower than the voltage at the second input terminal; A switching switch is connected between the output terminal of the supercapacitor module and the load of the control system. The control terminal of the switching switch is connected to the output terminal of the comparator. The switching switch is configured to disconnect in response to the first signal and turn on in response to the second signal.

2. The power management circuit for a medical instrument control system of claim 1, wherein, The circuit also includes a supercapacitor overvoltage protection chip, which is connected to the output terminal of the supercapacitor module.

3. The power management circuit of a medical instrument control system of claim 1, wherein, The supercapacitor module includes two supercapacitors connected in series, and the circuit also includes two supercapacitor overvoltage protection chips, which are respectively connected to the output terminals of the two supercapacitors.

4. The power management circuit of a medical instrument control system of any one of claims 1 to 3, wherein, A reverse connection protection switch is also provided between the input terminal of the supercapacitor module and the power input terminal.

5. The power management circuit of a medical instrument control system of claim 1, wherein, The circuit also includes a first voltage divider module and a second voltage divider module. The power input terminal is connected to the first input terminal of the comparator through the first voltage divider module, and the output terminal of the supercapacitor module is connected to the second input terminal of the comparator through the second voltage divider module.

6. The power management circuit of a medical instrument control system of claim 1, wherein, The circuit includes two switches connected in series, and a resistor is provided between the intermediate node of the two switches and the output terminal of the comparator.

7. The power management circuit for a medical instrument control system of any one of claims 1, 5, and 6, wherein, The circuit also includes a first diode, a second diode, and a current-limiting resistor. The first end of the first diode is connected to the power input terminal, the first end of the second diode is connected to the output terminal of the supercapacitor module, the second ends of the first diode and the second diode are connected to the first end of the current-limiting resistor, and the second end of the current-limiting resistor is connected to the output terminal of the comparator.

8. The power management circuit for a medical instrument control system of any one of claims 1, 5, and 6, wherein, The output of the comparator is also connected to the power failure detection terminal of the controller of the control system.

9. The power management circuit of a medical instrument control system of claim 1, wherein, A reverse connection protection switch is provided between the power input terminal and the load of the control system.

10. A medical device, comprising: The power supply management circuit of the medical device control system included in any one of claims 1 to 9.

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