A medical power supply and multi-level safety protection method thereof

Abstract

A medical power supply and a multi-level safety protection method thereof are disclosed. Each secondary power circuit is equipped with a circuit protection module. When the output current signal exceeds a preset range, the protection module is used to promptly generate a shutdown protection signal to prevent circuit overload or other abnormal conditions from continuing to occur, thereby effectively protecting the safety of equipment and patients. A monitoring module monitors the operating status of the main power circuit and the secondary power circuit in real time. When abnormal information is detected, the abnormal information is sent to a control module to ensure that the control module responds quickly. The abnormal information is processed and the processing results are analyzed based on preset rules to obtain an adjustment strategy. Based on the adjustment strategy, the operating status of the main power circuit and / or the corresponding abnormal secondary power circuit is adjusted to achieve dynamic regulation of the system and enhance the stability and reliability of the power supply in complex medical environments.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical power supplies, and in particular relates to a medical power supply and a multi-level safety protection method thereof. Background Art

[0002] In modern medical equipment, the power supply system is not only a key guarantee for the proper functioning of the equipment but also directly impacts the safety of patients and medical staff. Therefore, medical power systems must offer strict isolation protection, high reliability, and high-precision power supply capabilities to ensure stable operation in various medical scenarios. However, the complexity and uncertainty of the medical environment, such as power supply fluctuations, equipment failures, or high-load operation, place even higher demands on power systems. To address this, power systems must also provide real-time status monitoring and rapid response capabilities to promptly identify anomalies and take appropriate action.

[0003] While existing medical power systems have improved in terms of isolation protection and power supply reliability, their protection mechanisms are typically limited and inflexible, failing to address complex medical needs. This is especially true when faced with multiple abnormal conditions, where traditional protection methods struggle to ensure both operational continuity and safety, potentially impacting the overall performance of medical equipment. Therefore, implementing multi-level safety protection, intelligent operational status monitoring, and efficient power supply management within power systems has become a pressing technical challenge. Summary of the Invention

[0004] In view of this, an embodiment of the present invention provides a medical power supply and a multi-level safety protection method thereof. By combining multi-level safety protection with the processing of abnormal information, it aims to achieve multi-level safety protection for the power supply of medical equipment while realizing intelligent operation status monitoring and efficient power supply management.

[0005] An embodiment of the present invention provides a medical power supply, including:

[0006] A main power supply circuit, the input end of which is connected to an external power supply and is used to provide basic power supply requirements to several secondary power supply circuits;

[0007] Each of the secondary power supply circuits is equipped with a corresponding circuit protection module, the input end of each circuit protection module being connected to the output end of the corresponding secondary power supply circuit, and each circuit protection module being configured to generate a shutdown protection signal to the main power supply circuit when the output current signal of the corresponding secondary power supply circuit exceeds a preset current range;

[0008] Each of the secondary power supply circuits is used to provide multiple outputs to adapt to various power supply requirements;

[0009] a monitoring module, configured to detect the outputs of the main power circuit and each of the secondary power circuits in real time, and upon detecting abnormal information, send the abnormal information to the control module;

[0010] The control module is used to process the abnormal information, analyze the processing results based on preset rules, obtain an adjustment strategy, and adjust the main power circuit based on the adjustment strategy, and / or adjust the working state of the secondary power circuit corresponding to the abnormality.

[0011] In one embodiment, the circuit protection module includes a current sensor, a comparator, a reference voltage source, a MOS transistor, and a relay; the input end of the current sensor is connected to the output end of the corresponding secondary power supply circuit; the non-inverting input end of the comparator is connected to the output end of the current sensor, the inverting input end of the comparator is connected to the reference voltage source, and the output end of the comparator is connected to the gate of the MOS transistor; the drain of the MOS transistor is connected to the control end of the relay, and the source of the MOS transistor is grounded; the contacts of the relay are connected to the main power supply circuit.

[0012] In one embodiment, the medical power supply further includes: a plurality of DC / DC converters, and each DC / DC converter is respectively disposed between the main power circuit and each secondary power circuit.

[0013] In one embodiment, the medical power supply further includes a communication port, and the medical power supply exchanges data with the monitoring device via the communication port.

[0014] A second aspect of the present application provides a multi-level safety protection method for a medical power supply, which is applied to the medical power supply of the first aspect. The control method of the medical power supply includes:

[0015] Processing abnormal information of the main power circuit and / or several secondary power circuits;

[0016] Analyze the processing results based on preset rules to obtain adjustment strategies;

[0017] The main power circuit and / or the working state of the secondary power circuit corresponding to the abnormality are adjusted based on the adjustment strategy.

[0018] In one embodiment, processing abnormal information of a main power circuit and / or several secondary power circuits includes:

[0019] Each abnormal information is divided into its corresponding abnormal information set, and the level corresponding to each abnormal information is matched in the corresponding abnormal information set.

[0020] In one embodiment, the processing results are analyzed based on preset rules to obtain an adjustment strategy, including:

[0021] Match the level corresponding to each abnormal information with the membership in the preset rule base to obtain the membership corresponding to each input variable;

[0022] The adjustment strategy of the power supply mode is matched according to the membership degree.

[0023] In one embodiment, the preset rule base includes a mapping relationship between the level corresponding to the abnormal information and the membership degree.

[0024] In one embodiment, the abnormality information includes an overload abnormality, a temperature deviation abnormality, and / or a power supply delay abnormality.

[0025] In one embodiment, the level of the abnormal information includes: a current overload level, a temperature deviation level, and / or a power supply delay level.

[0026] The beneficial effects of the embodiments of the present application are as follows: by equipping each secondary power circuit with a circuit protection module, when the output current signal of a secondary power circuit exceeds a preset range, the protection module is used to promptly generate a shutdown protection signal to prevent the circuit from overloading or other abnormal conditions from continuing to occur, thereby effectively protecting the safety of the equipment and patients. The operating status of the main power circuit and the secondary power circuit is monitored in real time by the monitoring module, and when abnormal information is detected, the abnormal information is sent to the control module to ensure that the control module responds quickly. The abnormal information is processed and the processing results are analyzed based on preset rules to obtain an adjustment strategy. Based on the adjustment strategy, the operating status of the main power circuit and / or the corresponding abnormal secondary power circuit is adjusted, thereby enhancing the stability and reliability of the power supply in complex medical environments. The purpose is to achieve multi-level safety protection for the power supply of medical equipment while realizing intelligent operating status monitoring and efficient power supply management. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic block diagram of a medical power supply provided in accordance with an embodiment of the present invention;

[0029] Figure 2 A circuit diagram of circuit protection provided by an embodiment of the present application;

[0030] Figure 3 A circuit diagram of a current sensor provided in one embodiment of the present application;

[0031] Figure 4A flowchart of a multi-level safety protection method for a medical power supply provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0034] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0035] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0037] In the description of the embodiments of the present application, the term "multi-frame" refers to two or more (including two).

[0038] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0039] The embodiment of the present invention provides a medical power supply and a multi-level safety protection method thereof, wherein the medical power supply 10, see Figure 1 As shown, it includes: a main power circuit 100, several secondary power circuits 102, a circuit protection module 103, a monitoring module 104 and a control module 105.

[0040] The input of the main power circuit 100 is connected to an external power source, providing basic power to several secondary power circuits 102. Each secondary power circuit 102 is equipped with a corresponding circuit protection module 103. Each circuit protection module 103 is configured to generate a shutdown protection signal to the main power circuit 100 when the output current signal of the corresponding secondary power circuit 102 exceeds a preset current range. Each secondary power circuit 102 is configured to provide multiple outputs to accommodate various power supply requirements. A monitoring module 104 is configured to monitor the outputs of the main power circuit 100 and each secondary power circuit 102 in real time and, upon detecting any anomalies, transmit the anomaly information to a control module 105. The control module 105 is configured to process the anomaly information, analyze the processing results based on preset rules, derive an adjustment strategy, and adjust the operating state of the main power circuit 100 and / or the corresponding abnormal secondary power circuit 102 based on the adjustment strategy.

[0041] In this embodiment, each secondary power supply circuit 102 is equipped with a circuit protection module 103. When the output current signal of a secondary power supply circuit 102 exceeds a preset range, the circuit protection module 103 promptly generates a shutdown protection signal, so that the main power supply circuit 100 is disconnected from the power supply, preventing the secondary power supply circuit 102 from being overloaded or other abnormal conditions from continuing to occur, thereby effectively protecting the safety of the equipment and patients. The operating status of the main power supply circuit 100 and each secondary power supply circuit 102 is monitored in real time through the monitoring module 104, and when abnormal information is detected, the abnormal information is sent to the control module 105 to ensure that the control module 105 responds quickly and adjusts the working status of the main power supply circuit 100 or the corresponding secondary power supply circuit 102 according to the received abnormal information, thereby realizing dynamic adjustment and enhancing the stability and reliability of the power supply in a complex medical environment.

[0042] In specific applications, please refer to Figure 2 As shown, Figure 2 A circuit diagram of a circuit protection circuit provided in one embodiment of the present application. The circuit protection module 103 includes a current sensor 200, a comparator 201, a reference voltage source 202, a MOS transistor 203, and a relay 204. The input end of the current sensor 200 is connected to the output end of the corresponding secondary power supply circuit 102; the non-inverting input end of the comparator 201 is connected to the output end of the current sensor 200, the inverting input end of the comparator 201 is connected to the reference voltage source 202, and the output end of the comparator 201 is connected to the gate of the MOS transistor 203; the drain of the MOS transistor 203 is connected to the control end of the relay 204, the source of the MOS transistor 203 is grounded, and the contacts of the relay 204 are connected to the main power supply circuit 100.

[0043] The circuit protection module 103 collects the output current signal of the corresponding secondary power circuit 102 through the current sensor 200, converts it into a corresponding voltage signal, and then receives the voltage signal through the comparator 201 and compares it with the reference voltage signal output by the reference voltage source 202. Specifically, when the voltage signal exceeds or equals the reference voltage signal, a high-level signal is output, the MOS transistor 203 is turned on, and the relay 204 is driven to generate a protection signal, triggering the main power circuit 100 to disconnect the power supply to the secondary power circuit 102. When the voltage signal is lower than the reference voltage signal, a low-level signal is output, the MOS transistor 203 is turned off, and the relay 204 is closed. The circuit protection module 103 can detect the output current of the secondary power circuit 102 in real time, convert the actual current into a voltage signal, and compare it with a preset reference voltage value. If the output voltage is detected to be outside the preset safety range, the comparator 201 triggers the MOS transistor 203 to control the relay 204 to trigger the protection mechanism, effectively ensuring the safe use of medical power supplies.

[0044] In one embodiment, the current sensor 200 includes a shunt resistor 300 (see Figure 3 Specifically, the shunt resistor 300 utilizes a metal alloy or graphene composite material with a low temperature coefficient (TCR) to ensure precision stability. Furthermore, the shunt resistor 300 utilizes a double-layer distributed design to reduce thermal drift and improve linear response.

[0045] Also, see Figure 3As shown, the shunt resistor 300 and the comparator 201 may further include: a differential amplifier 301, a low-pass filter 302, and an analog-to-digital converter 303. One end (the high-potential end) of the shunt resistor 300 is connected to the positive electrode of the secondary power supply circuit 102 and the positive input of the differential amplifier 301, and the other end (the low-potential end) is connected to the negative input of the differential amplifier 301. The output of the differential amplifier 301 is connected to the input of the low-pass filter 302. The differential amplifier 301 collects the voltage signal across the shunt resistor 300 and outputs an amplified signal. The amplified signal passes through the low-pass filter 302 to remove high-frequency noise and is then input to the analog-to-digital converter 303. The input of the analog-to-digital converter 303 is connected to the output of the low-pass filter 302, and the output of the analog-to-digital converter 303 is connected to the comparator 201, for converting the filtered signal into a digital signal and outputting an accurate voltage value.

[0046] The comparator 201 may be an LM393 chip. By comparing the actual voltage signal of the current sensor 200 with the reference voltage signal, when the voltage signal of the current sensor 200 exceeds the reference voltage, the comparator outputs a high level signal.

[0047] Reference voltage source 202 can be a TL431 voltage regulator, providing a stable reference voltage that serves as a safety threshold. In practical applications, the reference voltage value can be adjusted as needed to flexibly set the triggering conditions for overcurrent protection. MOS transistor 203 acts as a switching element, controlling the operation of relay 204 based on the output of comparator 201. When MOS transistor 203 is on, the contacts of relay 204 operate, disconnecting the main power circuit 100 from power, preventing further damage to the power supply due to overcurrent. When MOS transistor 203 is off, relay 204 resets, resuming normal power supply.

[0048] In one embodiment, the medical power supply 10 further includes several DC / DC converters, each of which is positioned between the main power circuit 100 and each secondary power circuit (not shown). By introducing a DC / DC converter between the main power circuit 100 and each secondary power circuit 102, the DC / DC converters can convert the voltage output by the main power circuit 100 into the voltages required by each secondary power circuit 102 through regulation. This allows each secondary power circuit 102 to stably obtain the required voltage based on actual needs.

[0049] In one embodiment, the medical power supply 10 further includes a communication port, through which the medical power supply 10 exchanges data with a monitoring device. This allows power supply data to be uploaded to the monitoring device, allowing the monitoring device to analyze the power supply data and perform power supply risk warning analysis, further improving the safety of power supply use.

[0050] See also Figure 4 , Figure 4 This is a flow chart of the multi-level safety protection method for medical power supply provided in the embodiment of the present application. The control method of the medical power supply is applied to Figures 1 to 3 The medical power supply shown is detailed as follows:

[0051] S401: Processing abnormal information of a main power circuit and / or several secondary power circuits.

[0052] In one embodiment, abnormal information of a main power supply circuit and / or several secondary power supply circuits is processed, including: dividing each abnormal information into respective corresponding abnormal information sets, and matching the level corresponding to each abnormal information in the corresponding abnormal information sets.

[0053] Specifically, the abnormal information includes an overload abnormality, a temperature deviation abnormality, and / or a power supply delay abnormality. The levels of the abnormal information include: a current overload level, a temperature deviation level, and / or a power supply delay level.

[0054] Each type of abnormal information corresponds to a different abnormal information set, and in each abnormal information set there is an association relationship between the abnormal information of the corresponding category and the level corresponding to the abnormal information.

[0055] An overload anomaly refers to the ratio of the actual monitored current to the rated current; a temperature deviation anomaly refers to the difference between the actual monitored temperature and the preset normal operating temperature; and a power supply delay anomaly refers to the difference between the actual monitored power supply time and the expected power supply time. By measuring actual data and combining it with the power supply's preset specifications, we calculate overload anomalies, temperature deviation anomalies, and power supply delay anomalies. Each anomaly is then assigned a corresponding level within the corresponding anomaly information set, providing the data foundation for subsequent fuzzy analysis.

[0056] S402: Analyze the processing results based on preset rules to obtain an adjustment strategy.

[0057] The processing results are analyzed based on preset rules to obtain an adjustment strategy, including: matching the level corresponding to each abnormal information with the membership in the preset rule base to obtain the membership corresponding to each input variable; and matching the power supply mode adjustment strategy according to the membership.

[0058] The preset rule base includes a mapping relationship between the level corresponding to the abnormal information and the membership degree. Exemplarily, the membership degree is used to describe the degree of belonging of the level corresponding to the abnormal information in its corresponding rule base. This is because the level corresponding to the abnormal information is determined by the abnormal information, and different abnormal information may have the same level of corresponding abnormality within a certain range of values. For example, the current overload abnormality level includes "low" level, "medium" level and "high" level, wherein the current overload range corresponding to the "low" level is 0~30%, the current overload range corresponding to the "medium" level is 31%~60%, and the circuit overload range corresponding to the "high" level is greater than 61%. Therefore, it is necessary to further match the degree of belonging of the different abnormal levels in their corresponding rule bases, that is, the probability of them belonging to the corresponding abnormal level, in order to further accurately determine the preferred power supply mode adjustment strategy.

[0059] For example, if the current overload anomaly corresponds to a "medium" level, the membership degree is 0.7, which means the probability of it belonging to the "medium" level is 0.7. If the current overload anomaly corresponds to a "high" level, the membership degree is 0.3, which means the probability of it belonging to the "high" level is 0.3. In this case, the power supply mode adjustment strategy is matched preferentially to the one with the higher membership degree.

[0060] In addition, when there are levels corresponding to current overload anomalies, temperature deviation anomalies, and / or power supply delay anomalies, the comprehensive membership of the conditional part is calculated, and then the rule with the largest membership (i.e., the rule that best matches the current situation) is selected. The adjustment strategy corresponding to the rule with the largest match is the final power supply mode adjustment solution. Specifically, the comprehensive membership of the conditional part is calculated and expressed as: ( ), the corresponding final selection rule is: gmax( ),in, Indicates the level corresponding to the current overload abnormality. It is the abnormal level of temperature deviation. The abnormal level of power supply delay.

[0061] S403: Adjusting the working state of the main power circuit and / or the corresponding abnormal secondary power circuit based on the adjustment strategy.

[0062] For example, assuming that the current overload abnormality of the secondary power circuit is at the "medium" level, the temperature deviation abnormality is mild overheating, and the power supply delay abnormality is a short delay, the corresponding adjustment strategy is to reduce the power of the secondary power circuit by 10%.

[0063] By calculating the comprehensive membership to match the adjustment strategy, an accurate power supply adjustment strategy can be provided.

[0064] The beneficial effects of the embodiments of the present application are as follows: by equipping each secondary power circuit with a circuit protection module, when the output current signal of a secondary power circuit exceeds a preset range, the protection module is used to promptly generate a shutdown protection signal to prevent the circuit from overloading or other abnormal conditions from continuing to occur, thereby effectively protecting the safety of the equipment and patients. The operating status of the main power circuit and the secondary power circuit is monitored in real time by the monitoring module. When abnormal information is detected, the abnormal information is sent to the control module to ensure that the control module responds quickly. The abnormal information is processed based on the received abnormal information, and the processing results are analyzed based on preset rules to obtain an adjustment strategy. Based on the adjustment strategy, the operating status of the main power circuit and / or the corresponding abnormal secondary power circuit is adjusted to achieve dynamic adjustment of the power supply system, thereby enhancing the stability and reliability of the power supply in complex medical environments. The purpose is to achieve multi-level safety protection for the power supply of medical equipment while realizing intelligent operating status monitoring and efficient power supply management.

[0065] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0066] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0067] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A medical power supply, characterized in that: The medical power supply comprises: A main power supply circuit, the input end of which is connected to an external power supply and is used to provide basic power supply requirements to several secondary power supply circuits; Each of the secondary power supply circuits is equipped with a corresponding circuit protection module. The input end of each circuit protection module is connected to the output end of the corresponding secondary power supply circuit. Each circuit protection module includes a current sensor, a comparator, a reference voltage source, a MOS transistor, and a relay. The current sensor is used to collect the output current signal of the corresponding secondary power supply circuit and convert it into a corresponding voltage signal. The comparator is used to compare the received voltage signal with the reference voltage signal output by the reference voltage source. When the voltage signal of the secondary power supply circuit exceeds or equals the reference voltage signal, the comparator outputs a high-level signal to turn on the MOS transistor, drive the relay to generate a protection signal, and trigger the main power supply circuit to disconnect the power supply to the secondary power supply circuit. When the voltage signal of the secondary power supply circuit is lower than the reference voltage signal, the comparator outputs a low-level signal to turn off the MOS transistor and close the relay. Each of the secondary power supply circuits is used to provide multiple outputs to adapt to various power supply requirements; A monitoring module for detecting the output of the main power circuit and each of the secondary power circuits in real time, and sending the abnormal information to the control module after detecting abnormal information; the control module for dividing each abnormal information into its corresponding abnormal information set, and matching the level corresponding to each abnormal information in the corresponding abnormal information set; the abnormal information includes overload abnormality, temperature deviation abnormality, and / or power supply delay abnormality, and the levels of the abnormal information include: current overload level, temperature deviation level, and / or power supply delay level; each type of abnormal information corresponds to a different abnormal information set, and each abnormal information set has an association relationship between the abnormal information of the corresponding category and the level corresponding to the abnormal information; Matching the level of each abnormal information with the probability of indicating that the abnormal information belongs to the abnormal level in the corresponding preset rule to obtain the probability that each abnormal information belongs to the corresponding abnormal level, wherein the preset rule base includes a mapping relationship between the level corresponding to the abnormal information and the probability of indicating that the abnormal information belongs to the abnormal level; The main power supply circuit is adjusted according to the probability that each abnormality information belongs to an abnormality level, and / or the working state of the secondary power supply circuit corresponding to the abnormality is adjusted.

2. The medical power supply according to claim 1, wherein: The circuit protection module includes a current sensor, a comparator, a reference voltage source, a MOS transistor and a relay; the input end of the current sensor is connected to the output end of the corresponding secondary power supply circuit; the non-inverting input end of the comparator is connected to the output end of the current sensor, the inverting input end of the comparator is connected to the reference voltage source, and the output end of the comparator is connected to the gate of the MOS transistor; the drain of the MOS transistor is connected to the control end of the relay, and the source of the MOS transistor is grounded; the contacts of the relay are connected to the main power supply circuit.

3. The medical power supply according to claim 1, wherein: Also includes: A plurality of DC / DC converters are provided, and each of the DC / DC converters is respectively arranged between the main power supply circuit and each of the secondary power supply circuits.

4. The medical power supply according to claim 1, wherein: It also includes a communication port, through which the medical power supply exchanges data with the monitoring device.

5. A multi-level safety protection method for medical power supply, characterized in that: Applied to the medical power supply according to any one of claims 1 to 4, the method comprises: Each abnormal information is divided into its own corresponding abnormal information set, and the level corresponding to each abnormal information is matched in the corresponding abnormal information set; the abnormal information includes overload abnormality, temperature deviation abnormality, and / or power supply delay abnormality, and the level of the abnormal information includes: current overload level, temperature deviation level, and / or power supply delay level; each abnormal information corresponds to a different abnormal information set, and in each abnormal information set, there is an association relationship between the abnormal information of the corresponding category and the level corresponding to the abnormal information; Match the level of each abnormal information with the probability of the abnormal information belonging to the abnormal level in the corresponding preset rule to obtain the probability of each abnormal information belonging to the corresponding abnormal level. The preset rule base includes a mapping relationship between the level corresponding to the abnormal information and the probability of the abnormal information belonging to the abnormal level; The main power supply circuit is adjusted according to the probability that each abnormality information belongs to an abnormality level, and / or the working state of the secondary power supply circuit corresponding to the abnormality is adjusted.

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