CN110958000A - Medical equipment mainboard burn-proof protection circuit and working method thereof - Google Patents
Medical equipment mainboard burn-proof protection circuit and working method thereof Download PDFInfo
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- CN110958000A CN110958000A CN201911239094.7A CN201911239094A CN110958000A CN 110958000 A CN110958000 A CN 110958000A CN 201911239094 A CN201911239094 A CN 201911239094A CN 110958000 A CN110958000 A CN 110958000A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/04—Modifications for accelerating switching
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
- H03K17/161—Modifications for eliminating interference voltages or currents in field-effect transistor switches
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Abstract
The invention discloses a medical equipment mainboard anti-burning protection circuit and a working method thereof, wherein the medical equipment mainboard anti-burning protection circuit comprises a power supply input end, a mainboard power supply output end, a detection signal input end, a power supply detection module, a switch module and a voltage control module; the switch module comprises a P-channel field effect transistor Q1; the voltage control module comprises an N-channel field effect transistor Q2 and an N-channel field effect transistor Q3; two ends of the power output end of the mainboard are respectively connected with the drain electrode of the P-channel field effect transistor Q1 and the power detection module; the power detection module is connected with the detection signal input end and used for triggering the high-level detection signal. The application also discloses a working method of the medical equipment mainboard burning prevention protection circuit. The medical equipment mainboard burning-prevention protection circuit and the working method thereof have high timeliness and reliability.
Description
Technical Field
The invention relates to the technical field of switch circuits, in particular to a medical equipment mainboard burning-prevention protection circuit and a working method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
In the use of medical equipment, when medical equipment's mainboard power state appears unusually, not only can arouse the unsafe problem of testing result that equipment work is abnormal to lead to, abnormal voltage in the mainboard still can appear and cause the mainboard to burn out, leads to the problem of equipment damage to there is great potential safety hazard when using. Therefore, the power status of the main board of the medical equipment needs to be monitored in real time and timely processed when an abnormality occurs.
The mainboard burning prevention circuit in the prior art collects power when the mainboard runs, and after abnormity is found in the collection, the mainboard and the power are timely disconnected through manual work of workers or other power-off equipment. However, the motherboard often uses precision electronic components, and a transient power supply abnormality may cause immeasurable damage to the motherboard. The manual power-off operation needs manual power-off operation, and certain hysteresis exists; and the outage operation that outage equipment goes on need make a low-voltage, then inputs a low level signal on mainboard supply circuit, just can break off the mainboard supply circuit and be connected between the mainboard, and in operation process, the manufacturing of low level makes the outage operation become loaded down with trivial details and have certain hysteresis quality with the input, and then leads to the mainboard among the prior art to prevent burning the problem that the circuit has the relatively poor reliability.
It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.
Disclosure of Invention
The present invention is directed to solve the above problems, and provides a burn-proof protection circuit for a main board of a medical device, wherein when a power signal input at a power input terminal is abnormal, a high-level signal is input at a detection signal input terminal, so that the conduction between the power input terminal and the power output terminal of the main board can be disconnected by a switch module, and the burn-proof protection circuit can timely and effectively protect the main board. The invention also provides a working method of the medical equipment mainboard anti-burning protection circuit, and the high-level signal input by the detection signal input end can be quickly responded through the mutual influence of the P-channel field effect transistor Q1, the N-channel field effect transistor Q2 and the N-channel field effect transistor Q3, so that the timeliness of mainboard anti-burning protection is improved.
In order to solve the above problems, the present invention provides a burn-proof protection circuit for a medical device motherboard, which includes a power supply input terminal, a motherboard power supply output terminal, a detection signal input terminal, a power supply detection module, a switch module and a voltage control module; the switch module comprises a P-channel field effect transistor Q1; the source electrode of the P-channel field effect transistor Q1 is connected with the power supply input end; the drain electrode of the P-channel field effect transistor Q1 is connected with the power supply output end of the mainboard; the voltage control module comprises an N-channel field effect transistor Q2 and an N-channel field effect transistor Q3; the source electrode of the N-channel field effect transistor Q2 is grounded; the grid electrode of the N-channel field effect transistor Q2 is connected with the detection signal input end; the drain electrode of the N-channel field effect transistor Q2 is connected with the source electrode of the P-channel field effect transistor Q1 through a voltage division resistor R3; the drain electrode of the N-channel field effect transistor Q2 is connected with the grid electrode of the N-channel field effect transistor Q3; the drain electrode of the N-channel field effect transistor Q2 and the gate electrode of the N-channel field effect transistor Q3 are provided with a voltage division grounding resistor R6; the source electrode of the N-channel field effect transistor Q3 is grounded; the drain electrode of the N-channel field effect transistor Q3 is connected with the source electrode of the P-channel field effect transistor Q1 through a voltage division resistor R4 and a voltage division resistor R2; the drain electrode of the N-channel field effect transistor Q3 is connected with the grid electrode of the P-channel field effect transistor Q1 through the voltage dividing resistor R4; the two ends of the power output end of the main board are respectively connected with the drain electrode of the P-channel field effect transistor Q1 and the power detection module; the power detection module is connected with the detection signal input end and used for triggering a high-level detection signal.
Based on above-mentioned structure, the power supply input passes through switch module and mainboard power output and normally supplies power to the mainboard, when power detection module detects the power state of power supply input unusual, trigger and detect the high level signal of signal input end input, can be quick through voltage control module and input a low level signal on switch module, make the intercommunication between power supply input and mainboard power output disconnected by switch module, prevent that the problem from burning out to appear in the mainboard, the timeliness and the reliability of this application medical equipment mainboard burning protection circuit are improved.
Preferably, a signal filtering module is arranged between the power supply input end and the source of the P-channel field effect transistor Q1; the signal filtering module comprises a filter circuit and an anti-interference circuit; two ends of the filter circuit are respectively connected with the power supply input end and the anti-interference circuit; and two ends of the anti-interference circuit are respectively connected with the filter circuit and the source electrode of the P-channel field effect transistor Q1.
Further, set up signal filtering module between power supply input and switch module, can carry out filtering and anti-interference processing to the signal of power supply input, improved the accuracy of power detection module's testing result, and then can appear when unusual in the power of power supply input, timely response improves this application medical equipment mainboard and prevents burning the ageing and the reliability of protection circuit.
Preferably, the filter circuit comprises a capacitor C4 and a capacitor C6 connected in parallel; the anti-jamming circuit comprises a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C5 which are respectively connected with the capacitor C4 and the capacitor C6 in parallel; one common end of the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, the capacitor C5 and the capacitor C6 connected in parallel is grounded, and the other common end is electrically connected to the motherboard power interface unit and the source of the P-channel fet Q1.
Furthermore, a plurality of capacitors connected in parallel form a filter circuit and an anti-interference circuit, so that the structure of the signal filtering module is simplified, the occupied space of the protection circuit on the mainboard is reduced, and the economical efficiency of the anti-burning protection circuit of the mainboard of the medical equipment is improved.
Preferably, the P-channel fet Q1 is an enhancement fet; the source electrode ports of the P-channel field effect transistors Q1 are connected in parallel and then are connected with the power supply input end; and the drain electrode ports of the P-channel field effect transistors Q1 are connected in parallel and then are connected with the power supply output end of the mainboard.
Furthermore, the enhanced field effect tube is adopted to form the switch module, the structure of the switch module is simplified, the response speed of the switch module is effectively improved through the pin performance of the enhanced field effect tube, and the economical efficiency and the timeliness of the anti-burning protection circuit of the main board of the medical equipment are further improved.
Preferably, the power detection module includes a detection resistor R1, a voltage detection interface DC _ IN _ a, a current detection interface DC _ IN _ B, and a detection chip; two ends of the detection resistor R1 are respectively connected with the voltage detection interface DC _ IN _ A and the current detection interface DC _ IN _ B; one end of the detection resistor R1 is connected with the output end of the mainboard power supply; the voltage detection interface DC _ IN _ A and the current detection interface DC _ IN _ B are both connected with the detection chip; the detection chip is connected with the detection signal input end and used for triggering a high-level signal.
Further, detect the input power of power supply input end through detecting the chip, detect through voltage and the electric current on the detection resistor R1, and compare the testing result with the benchmark value, when deviation appears in detection numerical value and benchmark value, judge that the power of power supply input end input appears the abnormal conditions, and trigger and detect signal input end input high level and detect the signal, the state that has realized power supply input end input power can be accurately and obtain fast, the ageing and the reliability of this application medical equipment mainboard burn-proof protection circuit have been improved.
Preferably, a grounding capacitor C7 is connected between the detection resistor R1 and the voltage detection interface DC _ IN _ a; a grounding capacitor C8 is connected between the detection resistor R1 and the current detection interface DC _ IN _ B.
Further, through the setting of grounding capacitor C7 and grounding capacitor C8, can protect the power detection module effectively, prevent that the power detection module from appearing detecting the deviation, improve this application medical equipment mainboard and prevent burning protection circuit's reliability.
Preferably, a detection signal filter circuit is connected between the gate of the N-channel field effect transistor Q2 and the detection signal input terminal;
the detection signal filtering circuit comprises a grounding capacitor C9 and a grounding resistor R5; one end of the grounding capacitor C9 and one end of the grounding resistor R5 are respectively disposed between the detection signal input terminal and the gate of the N-channel fet Q2, and the other ends are grounded.
Furthermore, through the arrangement of the detection signal filter circuit, on one hand, the protection of the N-channel field effect transistor Q2 is realized, and the problem that the input signal damages the N-channel field effect transistor Q2, which causes the circuit to be incapable of normally operating is solved; on the other hand, can filter the sense signal, make the quick effect of sense signal N channel field effect transistor Q2's grid, improve this application medical equipment mainboard and prevent ageing nature and reliability of burning protection circuit.
In order to solve the technical problem, the invention also discloses a working method of the medical equipment mainboard anti-burning protection circuit, which comprises the following steps:
step one, a power supply input end inputs a power supply high level signal, a detection signal input end keeps a default low level state, an N-channel field effect transistor Q2 is closed, an N-channel field effect transistor Q3 is opened, a P-channel field effect transistor Q1 is opened, and the output end of a main board power supply outputs voltage to a main board;
step two, the power supply detection module detects the power supply signal input by the power supply input end, analyzes the power supply condition according to the detected data, and transmits the analysis result to the detection signal input end;
thirdly, a detection signal input end acquires a detection result of the power supply detection module, and when the acquired result is that the power supply is abnormal, a detection signal in a high level state is output from the detection signal input end;
and step four, after the high-level state detection signal is input, the N-channel field effect transistor Q2 is turned on, the N-channel field effect transistor Q3 is turned off, the grid voltage and the source voltage of the P-channel field effect transistor Q1 are equal, the P-channel field effect transistor Q1 is turned off, and the power supply input end is disconnected with the power supply output end of the mainboard.
Preferably, the first step specifically includes:
s1, when a power supply input end inputs a voltage high level signal, the detection signal input end keeps a default value of a low level state, at the moment, the grid electrode of the N-channel field effect transistor Q2 is in the low level state, the grid electrode potential of the N-channel field effect transistor Q2 is smaller than the drain electrode potential of the N-channel field effect transistor Q2, and the N-channel field effect transistor Q2 is closed;
s2, voltage input by the power supply input end is divided to the grid electrode of the N-channel field effect transistor Q3 through the voltage dividing resistor R3 and the voltage dividing grounding resistor R6, the grid electrode potential of the N-channel field effect transistor Q3 is larger than the drain electrode potential of the N-channel field effect transistor Q3, the N-channel field effect transistor Q3 is opened, and the drain electrode of the N-channel field effect transistor Q3 is pulled down to be in a low level state;
s3, voltage input by the power supply input end is divided to the grid electrode of the P-channel field effect transistor Q1 through a voltage dividing resistor R2 and a voltage dividing resistor R4, the grid electrode potential of the P-channel field effect transistor Q1 is smaller than the source electrode potential of the P-channel field effect transistor Q1, the potential difference value between the grid electrode and the source electrode of the P-channel field effect transistor Q1 is smaller than the conduction threshold value of the P-channel field effect transistor Q1, and the P-channel field effect transistor Q1 is turned on;
s4, the power supply input end and the mainboard power supply output end form a passage through the P-channel field effect transistor Q1, and the voltage output by the power supply output end normally supplies power to the mainboard.
Preferably, the fourth step specifically includes:
the T1 and the grid of the N-channel field effect transistor Q2 are changed into a high level state under the influence of a high level signal input by the detection signal input end, the source electrode of the N-channel field effect transistor Q2 is grounded, the difference value of the grid potential and the source electrode potential of the N-channel field effect transistor Q2 is larger than the conduction threshold value of the N-channel field effect transistor Q2, and the N-channel field effect transistor Q2 is opened;
the T2 and the N-channel field effect transistor Q2 are opened, the drain electrode of the N-channel field effect transistor Q2 is at a low level, the grid electrode of the N-channel field effect transistor Q3 is pulled down to be at a low level with the drain electrode of the N-channel field effect transistor Q2, the source electrode of the N-channel field effect transistor Q3 is grounded, the grid electrode potential of the N-channel field effect transistor Q3 is smaller than the drain electrode potential of the N-channel field effect transistor Q3, and the N-channel field effect transistor Q3 is closed;
the grid voltage of the T3 and the P channel field effect transistor Q1 is equal to the source voltage, and the P channel field effect transistor Q1 is closed;
and the T4 path between the power supply input end and the mainboard power supply output end is cut off by the P-channel field effect transistor Q1, and the voltage output by the power supply output end is cut off to supply power to the mainboard.
Based on the working method of the anti-burning protection circuit for the medical equipment mainboard, when a high-level signal is input at the power supply input end through the P-channel field effect transistor Q1, the N-channel field effect transistor Q2 and the N-channel field effect transistor Q3, normal power supply is realized from the power supply output end of the mainboard to the mainboard after the high-level signal passes through the P-channel field effect transistor Q1; when the power supply input by the power supply input end is detected to be abnormal, the influence of a high level signal input by the signal input end on the conduction state of the N-channel field effect transistor Q2 and the N-channel field effect transistor Q3 is detected, so that the P-channel field effect transistor Q1 is cut off, the conduction of the power supply input end and the power supply output end of the main board is cut off, and the main board stops supplying power; the aging type of the mainboard anti-burning protection circuit using the working method of the mainboard anti-burning protection circuit of the medical equipment is improved.
In summary, the medical equipment mainboard anti-burning protection circuit and the working method thereof can respond to the conduction between the power supply input end and the mainboard power supply output end in time according to the state of the power supply signal input by the power supply input end, and have higher timeliness and reliability.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a medical equipment main board anti-burning protection circuit according to an embodiment of the invention;
reference numerals: 100-power supply input end, 200-mainboard power supply output end, 300-detection signal input end, 400-power supply detection module, 500-switch module and 600-voltage control module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is considered as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Example (b): referring to fig. 1, the burn-proof protection circuit for a main board of a medical apparatus includes a power supply input terminal 100, a main board power output terminal 200, a detection signal input terminal 300, a power detection module 400, a switch module 500, and a voltage control module 600; the switching module 500 includes a P-channel field effect transistor Q1; the source electrode of the P-channel field effect transistor Q1 is connected with the power supply input end 100; the drain electrode of the P-channel field effect transistor Q1 is connected with the power output end 200 of the mainboard; the voltage control module 600 comprises an N-channel field effect transistor Q2 and an N-channel field effect transistor Q3; the source electrode of the N-channel field effect transistor Q2 is grounded; the gate of the N-channel field effect transistor Q2 is connected to the detection signal input terminal 300; the drain electrode of the N-channel field effect transistor Q2 is connected with the source electrode of the P-channel field effect transistor Q1 through a voltage dividing resistor R3; the drain electrode of the N-channel field effect transistor Q2 is connected with the grid electrode of the N-channel field effect transistor Q3; the drain electrode of the N-channel field effect transistor Q2 and the grid electrode of the N-channel field effect transistor Q3 are provided with a voltage division grounding resistor R6; the source electrode of the N-channel field effect transistor Q3 is grounded; the drain electrode of the N-channel field effect transistor Q3 is connected with the source electrode of the P-channel field effect transistor Q1 through a voltage division resistor R4 and a voltage division resistor R2; the drain electrode of the N-channel field effect transistor Q3 is connected with the grid electrode of the P-channel field effect transistor Q1 through a voltage dividing resistor R4; the two ends of the mainboard power supply output end 200 are respectively connected with the drain electrode of the P-channel field effect transistor Q1 and the power supply detection module 400; the power detection module 400 is connected to the detection signal input terminal 300 for triggering a high level detection signal. In the present embodiment, the P-channel fet Q1, the N-channel fet Q2, and the N-channel fet Q3 are based on the prior art.
Based on above-mentioned structure, power supply input 100 is through switch module 500 and mainboard power output 200 to the mainboard normal power supply, when power detection module 400 detects the power state of power supply input 100 input unusual, trigger and detect signal input 300 and input high level signal, can be quick through voltage control module 600 and input a low level signal on switch module 500, make the intercommunication between power supply input 100 and mainboard power output 200 disconnected by switch module 500, prevent that the mainboard from burning out the problem, the timeliness and the reliability of this application medical equipment mainboard burn-proof protection circuit have been improved.
In some possible embodiments of the present application, the power input 100 is connected to an ATX interface of a motherboard for providing motherboard power to the protection circuit. The power output end 200 of the main board is connected with a power interface on the CPU of the main board and used for supplying power to the CPU. The N-channel fet Q2 is of the type 2N7002, but not limited thereto, and has a package type SOT-23 with a turn-on voltage and a turn-on current of 60V and 0.3A, respectively. The N-channel fet Q3 is of the type 2N7002, but not limited thereto, and has a package type SOT-23 with a turn-on voltage and a turn-on current of 60V and 0.3A, respectively. The resistance value of the voltage dividing resistor R3 is, but not limited to, 300K Ω, the resistance value of the voltage dividing grounding resistor R6 is, but not limited to, 330K Ω, the resistance value of the voltage dividing resistor R4 is, but not limited to, 150K Ω, and the resistance value of the voltage dividing resistor R2 is, but not limited to, 330K Ω.
As a preferred implementation manner of this embodiment, a signal filtering module is disposed between the power supply input terminal 100 and the source of the P-channel fet Q1; the signal filtering module comprises a filter circuit and an anti-interference circuit; two ends of the filter circuit are respectively connected with the power supply input end 100 and the anti-interference circuit; and two ends of the anti-interference circuit are respectively connected with the filter circuit and the source electrode of the P-channel field effect transistor Q1. The benefit that sets up like this sets up signal filtering module between power input 100 and switch module 500, can filter and anti-interference processing to the signal of power input 100 input, has improved the accuracy of power detection module 400's testing result, and then can appear when unusual in the power of power input 100 input, timely response improves this application medical equipment mainboard and prevents burning protection circuit's ageing and reliability.
In the present embodiment, the filter circuit includes a capacitor C4 and a capacitor C6 connected in parallel; the anti-interference circuit comprises a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C5 which are respectively connected with the capacitor C4 and the capacitor C6 in parallel; one common end of the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, the capacitor C5 and the capacitor C6 which are connected in parallel is grounded, and the other common end is electrically connected with the main board power interface unit and the source electrode of the P-channel field effect transistor Q1 respectively. In some possible embodiments of the present application, the capacitance of the capacitor C1 is, but not limited to, 4.7uF, the capacitance of the capacitor C2 is, but not limited to, 1uF, the capacitance of the capacitor C3 is, but not limited to, 0.01uF, the capacitance of the capacitor C4 is, but not limited to, 1000pF, the capacitance of the capacitor C5 is, but not limited to, 1uF, and the capacitance of the capacitor C6 is, but not limited to, 18 pF. The advantage that sets up like this is, constitutes filter circuit and anti jamming circuit through a plurality of condensers of parallelly connected, has simplified the structure of signal filtering module, has reduced the occupation space of protection circuit on the mainboard, and then has improved this application medical equipment mainboard and has prevented burning protection circuit's economic nature.
As a preferred implementation manner of this embodiment, the P-channel fet Q1 is an enhancement fet; the source electrode ports of the P-channel field effect transistors Q1 are connected in parallel and then are connected with the power supply input end 100; the drain port of the P-channel field effect transistor Q1 is connected in parallel and then connected to the motherboard power supply output 200. In some possible embodiments of the present application, P-channel FET Q1 is of a type such as but not limited to AO4407A with a package mode of SOP8 and a turn-on voltage and current of-12A and-30V, respectively. The benefit that sets up like this is, adopts enhancement mode field effect transistor to constitute switch module 500, has simplified switch module 500's structure to pin performance through enhancement mode field effect transistor has improved switch module 500's response speed effectively, and then has improved economic nature and the ageing of this application medical equipment mainboard burnout prevention protection circuit.
As a preferred implementation manner of this embodiment, the power detection module 400 includes a detection resistor R1, a voltage detection interface DC _ IN _ a, a current detection interface DC _ IN _ B, and a detection chip; two ends of the detection resistor R1 are respectively connected with the voltage detection interface DC _ IN _ A and the current detection interface DC _ IN _ B; one end of the detection resistor R1 is connected to the motherboard power output 200; the voltage detection interface DC _ IN _ A and the current detection interface DC _ IN _ B are both connected with the detection chip; the detection chip is connected to the detection signal input terminal 300 for triggering a high level signal. In some possible embodiments of the present application, the resistance of the sensing resistor R1 is, but not limited to, 10m Ω, and the sensing chip can be a voltage and current sensing chip commonly used in the art for sensing voltage and current and comparing the sensed parameters with preset parameters. The benefit of setting up like this is, detect power input 100's input power through detecting the chip, detect through voltage and electric current on the detection resistor R1, and compare the testing result with the benchmark value, when deviation appears in detection numerical value and benchmark value, judge that the power of power input 100 input abnormal conditions appears, and trigger and detect signal input 300 and input the high level and detect the signal, the state that has realized power input 100 input power can be accurately and acquire fast, the timeliness and the reliability of this application medical equipment mainboard burn-proof protection circuit have been improved.
IN the present embodiment, a grounding capacitor C7 is connected between the detection resistor R1 and the voltage detection interface DC _ IN _ a; a grounding capacitor C8 is connected between the detection resistor R1 and the current detection interface DC _ IN _ B. In some possible embodiments of the present application, the capacitance value of the grounding capacitor C7 is, but is not limited to, 18pF, and the capacitance value of the grounding capacitor C8 is, but is not limited to, 18 pF. The benefit of setting up like this is, through grounding capacitor C7 and grounding capacitor C8's setting, can protect power detection module 400 effectively, prevents that power detection module 400 from appearing detecting the deviation, improves the reliability of this application medical equipment mainboard anti-burn protection circuit.
As a preferred implementation manner of this embodiment, a detection signal filtering circuit is connected between the gate of the N-channel fet Q2 and the detection signal input terminal 300; the detection signal filter circuit includes a grounded capacitor C9 and a grounded resistor R5; one end of the grounding capacitor C9 and one end of the grounding resistor R5 are respectively disposed between the detection signal input terminal 300 and the gate of the N-channel fet Q2, and the other ends are grounded. In some possible embodiments of the present application, the capacitance value of the grounding capacitor C9 is, but is not limited to, 0.1uF, and the resistance value of the grounding resistor R5 is, but is not limited to, 10K Ω. The arrangement has the advantages that through the arrangement of the detection signal filter circuit, on one hand, the protection of the N-channel field effect transistor Q2 is realized, and the problem that the input signal damages the N-channel field effect transistor Q2, which causes the circuit to be incapable of normally operating is solved; on the other hand, can filter the sense signal, make the quick effect of sense signal N channel field effect transistor Q2's grid, improve this application medical equipment mainboard and prevent ageing nature and reliability of burning protection circuit.
The embodiment also discloses a working method of the medical equipment mainboard burning prevention protection circuit, which comprises the following steps:
step one, a power supply input end 100 inputs a power supply high level signal, a detection signal input end 300 keeps a default low level state, an N-channel field effect transistor Q2 is closed, an N-channel field effect transistor Q3 is opened, a P-channel field effect transistor Q1 is opened, and a main board power supply output end 200 outputs voltage to a main board;
step two, the power detection module 400 detects the power signal input by the power input terminal 100, analyzes the power condition according to the detected data, and transmits the analysis result to the detection signal input terminal 300;
step three, the detection signal input end 300 acquires the detection result of the power detection module 400, and when the acquired result is that the power is abnormal, the detection signal input end 300 outputs a high-level state detection signal;
and step four, after the high-level state detection signal is input, the N-channel field effect transistor Q2 is turned on, the N-channel field effect transistor Q3 is turned off, the grid voltage and the source voltage of the P-channel field effect transistor Q1 are equal, the P-channel field effect transistor Q1 is turned off, and the power supply input end 100 is disconnected with the mainboard power supply output end 200.
Preferably, the first step specifically comprises:
s1, when the power supply input terminal 100 inputs a high-level voltage signal, the detection signal input terminal 300 maintains a default value of a low-level state, at this time, the gate of the N-channel fet Q2 is in a low-level state, the gate potential of the N-channel fet Q2 is smaller than the drain potential of the N-channel fet Q2, and the N-channel fet Q2 is turned off;
s2, voltage input by the power supply input end 100 is divided to the grid electrode of the N-channel field effect transistor Q3 through the voltage dividing resistor R3 and the voltage dividing grounding resistor R6, the grid electrode potential of the N-channel field effect transistor Q3 is larger than the drain electrode potential of the N-channel field effect transistor Q3, the N-channel field effect transistor Q3 is opened, and the drain electrode of the N-channel field effect transistor Q3 is pulled down to be in a low level state;
s3, voltage input by the power supply input end 100 is divided to the grid electrode of the P-channel field effect transistor Q1 through the voltage dividing resistor R2 and the voltage dividing resistor R4, the grid electrode potential of the P-channel field effect transistor Q1 is smaller than the source electrode potential of the P-channel field effect transistor Q1, the potential difference value between the grid electrode and the source electrode of the P-channel field effect transistor Q1 is smaller than the conduction threshold value of the P-channel field effect transistor Q1, and the P-channel field effect transistor Q1 is opened;
s4, the power supply input end 100 and the mainboard power supply output end 200 form a passage through the P-channel field effect transistor Q1, and the voltage output by the power supply output end normally supplies power to the mainboard.
Preferably, the step four specifically includes:
the T1 and the grid of the N-channel field effect transistor Q2 are changed into a high level state under the influence of a high level signal input by the detection signal input end 300, the source electrode of the N-channel field effect transistor Q2 is grounded, the difference value of the grid potential and the source electrode potential of the N-channel field effect transistor Q2 is larger than the conduction threshold value of the N-channel field effect transistor Q2, and the N-channel field effect transistor Q2 is opened;
the T2 and the N-channel field effect transistor Q2 are opened, the drain electrode of the N-channel field effect transistor Q2 is at a low level, the grid electrode of the N-channel field effect transistor Q3 is pulled down to be at a low level with the drain electrode of the N-channel field effect transistor Q2, the source electrode of the N-channel field effect transistor Q3 is grounded, the grid electrode potential of the N-channel field effect transistor Q3 is smaller than the drain electrode potential of the N-channel field effect transistor Q3, and the N-channel field effect transistor Q3 is closed;
the grid voltage of the T3 and the P channel field effect transistor Q1 is equal to the source voltage, and the P channel field effect transistor Q1 is closed;
the T4, the power supply input end 100 and the mainboard power supply output end 200 are cut off by the P-channel field effect transistor Q1, and the voltage output by the power supply output end is cut off to supply power to the mainboard.
Based on the working method of the anti-burning protection circuit for the medical equipment mainboard, when a high-level signal is input at the power supply input end 100 and passes through the P-channel field effect tube Q1, normal power supply is carried out on the mainboard from the power supply output end 200 through the P-channel field effect tube Q1, the N-channel field effect tube Q2 and the N-channel field effect tube Q3; when the power supply input by the power supply input end 100 is detected to be abnormal, the high level signal input by the detection signal input end 300 influences the conduction state of the N-channel field effect transistor Q2 and the N-channel field effect transistor Q3 to cut off the P-channel field effect transistor Q1, the conduction of the power supply input end 100 and the mainboard power supply output end 200 is cut off, and the mainboard stops supplying power; the aging type of the mainboard anti-burning protection circuit using the working method of the mainboard anti-burning protection circuit of the medical equipment is improved.
In summary, the anti-burn protection circuit for a motherboard of medical equipment and the working method thereof in this embodiment can respond to the conduction between the power supply input terminal 100 and the power output terminal 200 of the motherboard in time according to the state of the power signal input by the power supply input terminal 100, and have high timeliness and reliability.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A medical equipment mainboard anti-burning protection circuit is characterized by comprising a power supply input end (100), a mainboard power supply output end (200), a detection signal input end (300), power supply detection modules (400) and (500) and a voltage control module (600);
the switching module (500) comprises a P-channel field effect transistor Q1;
the source electrode of the P-channel field effect transistor Q1 is connected with the power supply input end (100); the drain electrode of the P-channel field effect transistor Q1 is connected with the main board power supply output end (200);
the voltage control module (600) comprises an N-channel field effect transistor Q2 and an N-channel field effect transistor Q3;
the source electrode of the N-channel field effect transistor Q2 is grounded; the grid electrode of the N-channel field effect transistor Q2 is connected with the detection signal input end (300); the drain electrode of the N-channel field effect transistor Q2 is connected with the source electrode of the P-channel field effect transistor Q1 through a voltage division resistor R3; the drain electrode of the N-channel field effect transistor Q2 is connected with the grid electrode of the N-channel field effect transistor Q3; the drain electrode of the N-channel field effect transistor Q2 and the gate electrode of the N-channel field effect transistor Q3 are provided with a voltage division grounding resistor R6;
the source electrode of the N-channel field effect transistor Q3 is grounded; the drain electrode of the N-channel field effect transistor Q3 is connected with the source electrode of the P-channel field effect transistor Q1 through a voltage division resistor R4 and a voltage division resistor R2; the drain electrode of the N-channel field effect transistor Q3 is connected with the grid electrode of the P-channel field effect transistor Q1 through the voltage dividing resistor R4;
two ends of the mainboard power supply output end (200) are respectively connected with the drain electrode of the P-channel field effect transistor Q1 and the power supply detection module (400); the power detection module (400) is connected with the detection signal input end (300) and is used for triggering a high-level detection signal.
2. The medical device motherboard anti-burn circuit as claimed in claim 1, wherein a signal filtering module is disposed between the power supply input terminal (100) and the source of the P-channel fet Q1; the signal filtering module comprises a filter circuit and an anti-interference circuit; two ends of the filter circuit are respectively connected with the power supply input end (100) and the anti-interference circuit; and two ends of the anti-interference circuit are respectively connected with the filter circuit and the source electrode of the P-channel field effect transistor Q1.
3. The medical device motherboard burn prevention circuit of claim 2 wherein said filter circuit comprises a capacitor C4 and a capacitor C6 connected in parallel; the anti-jamming circuit comprises a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C5 which are respectively connected with the capacitor C4 and the capacitor C6 in parallel; one common end of the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, the capacitor C5 and the capacitor C6 connected in parallel is grounded, and the other common end is electrically connected to the motherboard power interface unit and the source of the P-channel fet Q1.
4. The medical equipment mainboard burning prevention circuit according to claim 1, wherein the P-channel fet Q1 is an enhancement fet; the source electrode ports of the P-channel field effect transistors Q1 are connected in parallel and then are connected with the power supply input end (100); and the drain electrode ports of the P-channel field effect transistors Q1 are connected in parallel and then are connected with the main board power supply output end (200).
5. The medical equipment mainboard burn-proof circuit according to claim 1, wherein the power detection module (400) comprises a detection resistor R1, a voltage detection interface DC _ IN _ a, a current detection interface DC _ IN _ B, and a detection chip;
two ends of the detection resistor R1 are respectively connected with the voltage detection interface DC _ IN _ A and the current detection interface DC _ IN _ B;
one end of the detection resistor R1 is connected with the mainboard power supply output end (200);
the voltage detection interface DC _ IN _ A and the current detection interface DC _ IN _ B are both connected with the detection chip; the detection chip is connected with the detection signal input end (300) and used for triggering a high-level signal.
6. The medical device main board burn-proof circuit according to claim 5, wherein a grounding capacitor C7 is connected between the detection resistor R1 and the voltage detection interface DC _ IN _ A; a grounding capacitor C8 is connected between the detection resistor R1 and the current detection interface DC _ IN _ B.
7. The medical equipment mainboard burn-proof protection circuit according to claim 1, wherein a detection signal filter circuit is connected between the gate of the N-channel field effect transistor Q2 and the detection signal input terminal (300);
the detection signal filtering circuit comprises a grounding capacitor C9 and a grounding resistor R5; one end of the grounding capacitor C9 and one end of the grounding resistor R5 are respectively disposed between the detection signal input terminal (300) and the gate of the N-channel fet Q2, and the other ends are grounded.
8. The working method of the medical equipment mainboard burn-proof protection circuit according to claim 1, characterized by comprising the following steps:
step one, a power supply input end (100) inputs a power supply high level signal, a detection signal input end (300) keeps a default low level state, an N-channel field effect transistor Q2 is closed, an N-channel field effect transistor Q3 is opened, a P-channel field effect transistor Q1 is opened, and a mainboard power supply output end (200) outputs voltage to a mainboard;
step two, the power supply detection module (400) detects the power supply signal input by the power supply input end (100), analyzes the power supply condition according to the detected data, and transmits the analysis result to the detection signal input end (300);
step three, the detection signal input end (300) acquires the detection result of the power supply detection module (400), and when the acquired result is that the power supply is abnormal, the detection signal input end (300) outputs a high-level state detection signal;
and fourthly, after the high-level state detection signal is input, the N-channel field effect transistor Q2 is turned on, the N-channel field effect transistor Q3 is turned off, the grid voltage and the source voltage of the P-channel field effect transistor Q1 are equal, the P-channel field effect transistor Q1 is turned off, and the power supply input end (100) is disconnected with the mainboard power supply output end (200).
9. The operating method of the medical equipment mainboard burn-prevention protection circuit according to claim 8, wherein the first step specifically comprises:
s1, when a high-level voltage signal is input at the power supply input end (100), the detection signal input end (300) keeps a default value of a low-level state, the grid electrode of the N-channel field-effect tube Q2 is pulled down to be in the low-level state, at the moment, the grid electrode potential of the N-channel field-effect tube Q2 is smaller than the drain electrode potential of the N-channel field-effect tube Q2, and the N-channel field-effect tube Q2 is closed;
s2, voltage input by the power supply input end (100) is divided to the grid electrode of the N-channel field effect transistor Q3 through the voltage dividing resistor R3 and the voltage dividing grounding resistor R6, the grid electrode potential of the N-channel field effect transistor Q3 is larger than the drain electrode potential of the N-channel field effect transistor Q3, the N-channel field effect transistor Q3 is opened, and the drain electrode of the N-channel field effect transistor Q3 is pulled down to be in a low level state;
s3, voltage input by the power supply input end (100) is divided to the grid electrode of a P-channel field effect tube Q1 through a voltage dividing resistor R2 and a voltage dividing resistor R4, the grid electrode potential of the P-channel field effect tube Q1 is smaller than the source electrode potential of a P-channel field effect tube Q1, the potential difference value between the grid electrode and the source electrode of a P-channel field effect tube Q1 is smaller than the conduction threshold value of the P-channel field effect tube Q1, and the P-channel field effect tube Q1 is opened;
s4, the power supply input end (100) and the mainboard power supply output end (200) form a passage through the P-channel field effect transistor Q1, and the voltage output by the power supply output end normally supplies power to the mainboard.
10. The operating method of the medical equipment mainboard burn-prevention protection circuit according to claim 8, wherein the fourth step specifically comprises:
the grid electrode of the T1 and the N-channel field effect transistor Q2 is changed into a high level state under the influence of a high level signal input by a detection signal input end (300), the source electrode of the N-channel field effect transistor Q2 is grounded, the difference value of the grid electrode potential and the source electrode potential of the N-channel field effect transistor Q2 is larger than the conduction threshold value of the N-channel field effect transistor Q2, and the N-channel field effect transistor Q2 is opened;
the T2 and the N-channel field effect transistor Q2 are opened, the drain electrode of the N-channel field effect transistor Q2 is at a low level, the grid electrode of the N-channel field effect transistor Q3 is pulled down to be at a low level with the drain electrode of the N-channel field effect transistor Q2, the source electrode of the N-channel field effect transistor Q3 is grounded, the grid electrode potential of the N-channel field effect transistor Q3 is smaller than the drain electrode potential of the N-channel field effect transistor Q3, and the N-channel field effect transistor Q3 is closed;
the grid voltage of the T3 and the P channel field effect transistor Q1 is equal to the source voltage, and the P channel field effect transistor Q1 is closed;
the T4, the power supply input end (100) and the main board power supply output end (200) are cut off by the P-channel field effect tube Q1, and the voltage output by the power supply output end is cut off to supply power to the main board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911239094.7A CN110958000A (en) | 2019-12-06 | 2019-12-06 | Medical equipment mainboard burn-proof protection circuit and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911239094.7A CN110958000A (en) | 2019-12-06 | 2019-12-06 | Medical equipment mainboard burn-proof protection circuit and working method thereof |
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| CN110958000A true CN110958000A (en) | 2020-04-03 |
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| CN201911239094.7A Pending CN110958000A (en) | 2019-12-06 | 2019-12-06 | Medical equipment mainboard burn-proof protection circuit and working method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112130098A (en) * | 2020-09-17 | 2020-12-25 | 上海创功通讯技术有限公司 | Connection detection device, mainboard and terminal |
| CN113552474A (en) * | 2021-07-29 | 2021-10-26 | 上海壁仞智能科技有限公司 | Compatible power interface detection circuit and electronic equipment |
| CN113567839A (en) * | 2021-07-29 | 2021-10-29 | 深圳市火乐科技发展有限公司 | Circuit detection system and projection equipment |
-
2019
- 2019-12-06 CN CN201911239094.7A patent/CN110958000A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112130098A (en) * | 2020-09-17 | 2020-12-25 | 上海创功通讯技术有限公司 | Connection detection device, mainboard and terminal |
| CN113552474A (en) * | 2021-07-29 | 2021-10-26 | 上海壁仞智能科技有限公司 | Compatible power interface detection circuit and electronic equipment |
| CN113567839A (en) * | 2021-07-29 | 2021-10-29 | 深圳市火乐科技发展有限公司 | Circuit detection system and projection equipment |
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