CN220525924U - ME equipment differential mode test device - Google Patents
ME equipment differential mode test device Download PDFInfo
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- CN220525924U CN220525924U CN202321588173.0U CN202321588173U CN220525924U CN 220525924 U CN220525924 U CN 220525924U CN 202321588173 U CN202321588173 U CN 202321588173U CN 220525924 U CN220525924 U CN 220525924U
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Abstract
The utility model discloses a ME equipment differential mode test device, which relates to the technical field of medical instrument test and comprises the following components: the device comprises an excitation module, equipment to be tested, a grounding module, a common mode choke coil and a test module, wherein the grounding module comprises a protective grounding module and an LC filter which are connected in parallel, and the grounding module is connected with the equipment to be tested; the output end of the excitation module is connected with the input end of the equipment to be tested, the output end of the equipment to be tested is connected with the input end of the common mode choke, and the output end of the common mode choke is connected with the input end of the test module. According to the utility model, the LC filter is formed by connecting the common mode choke coil in series and connecting the capacitor in parallel between the ground and the lead for filtering, so that common mode conduction noise is filtered, and the differential mode signal identification precision is improved. And the output end of the excitation module is in signal connection with the ME equipment and the application end, and differential mode noise existing at different positions is tested by respectively grounding the ME equipment and the application end.
Description
Technical Field
The utility model relates to the technical field of medical instrument testing, in particular to an ME equipment differential mode test device.
Background
The ME device, i.e. medical electrical device, refers to any medical device in the active medical device that relies on electrical energy or other energy sources to perform its function, not directly generated by the human body or gravity, including multi-parameter monitors, ultrasonic diagnostic devices, infusion pumps, infusion controllers, and the like. The ME device is subject to electromagnetic interference, which mainly includes differential mode noise and common mode noise. A noise source of differential mode noise appears on and in series with the power supply line, and a noise current flows in the same direction as the power supply current, referred to as a differential mode because the output and return currents are in opposite directions. The common mode noise is noise in which noise current leaked by a stray capacitor or the like passes through the ground and returns to the power supply line, and is referred to as a common mode because the directions of noise currents flowing through the positive and negative terminals of the power supply are the same.
The main hazard of differential mode interference is to influence the magnitude of the input signal, creating errors. In practical applications, the effects of various environmental noises caused by temperature changes can be regarded as common mode interference, but if the attenuation of the noise to the ground of two wires is not great enough in the transmission process, a voltage difference exists between the two wires, and the common mode noise is converted into differential mode noise. Each wire in the twisted pair cable is mutually wound in a double-spiral structure, a magnetic field generated by current flowing through each wire is limited by spiral shape, and the direction of the current flowing through each wire in the twisted pair determines the noise emission degree of each pair of wires. The degree of emission caused by the differential and common mode currents flowing on each pair of conductors is different and the noise emission caused by the differential mode current is small, so the noise is mainly determined by the common mode current.
Therefore, how to provide an ME device differential mode test device, eliminate the influence of the common mode current signal in the signal, so as to obtain the differential mode current signal existing when the ME device and the application end device connected with the ME device are used, realize the accurate test of the differential mode current signal existing in reality, and provide technical support for debugging or optimizing the ME device or the application end connected with the ME device, which is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the utility model provides a differential mode test device for an ME device, which eliminates the influence of common mode current signals in signals to obtain differential mode current signals existing in the ME device and application end equipment connected with the ME device when in use, realizes accurate test of the differential mode current signals existing in practice, and reduces safety accidents caused by output signal errors caused by the differential mode current signals.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
an ME equipment differential mode test apparatus comprising: the device comprises an excitation module, equipment to be tested, a grounding module, a common mode choke coil and a test module, wherein the grounding module is a protective grounding module and an LC filter which are connected in parallel, and the grounding module is connected with the equipment to be tested;
the output end of the excitation module is connected with the input end of the equipment to be tested, the output end of the equipment to be tested is connected with the input end of the common mode choke, and the output end of the common mode choke is connected with the input end of the test module.
Optionally, the excitation module is configured to output an ac power supply voltage, where the ac power supply voltage is not more than 250V.
Optionally, the excitation module is further configured to change the polarity of the ac power supply voltage and output an ac power supply voltage with opposite polarity.
Optionally, the device to be tested includes an ME device and an application end, where the ME device is in signal connection with the application end, the ME device is a medical electrical device, and the application end is a functional module carried on the medical electrical device.
Optionally, the LC filter is formed by connecting a ground wire and a capacitor in parallel.
Optionally, the common mode choke is used for counteracting a common mode current signal in the output current of the output end of the device to be tested.
Optionally, the test module is configured to divide the output voltage at the output end of the common mode choke into two paths, and measure peak voltages in the two paths respectively.
Optionally, the peak voltage difference in the two paths does not exceed 1V.
Compared with the prior art, the utility model discloses and provides the ME equipment differential mode test device, which has the following beneficial effects:
the device comprises an excitation module, equipment to be tested, a grounding module, a common mode choke coil and a test module, wherein the grounding module is a protective grounding module and an LC filter which are connected in parallel, and the grounding module is connected with the equipment to be tested; the output end of the excitation module is connected with the input end of the equipment to be tested, the output end of the equipment to be tested is connected with the input end of the common mode choke, and the output end of the common mode choke is connected with the input end of the test module and used for testing differential mode current signals existing in the equipment to be tested. According to the utility model, the LC filter is formed by connecting the common mode choke coil in series and connecting the capacitor in parallel between the ground and the lead for filtering, so that common mode conduction noise is filtered, and the differential mode signal identification precision is improved. The output end of the excitation module is connected with the input end of equipment to be tested, the equipment to be tested comprises ME equipment and an application end, the ME equipment is in signal connection with the application end, and differential mode noise existing at different positions is tested by respectively grounding the ME equipment and the application end.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a differential mode test device for ME equipment.
Fig. 2 is a schematic circuit diagram of a test module according to the present utility model.
Fig. 3 is a schematic diagram of an LC filter structure according to the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The embodiment of the utility model discloses a differential mode test device of ME equipment, as shown in figure 1, comprising: the device comprises an excitation module, equipment to be tested, a grounding module, a common mode choke coil and a test module, wherein the grounding module is a protective grounding module and an LC filter which are connected in parallel, and the grounding module is connected with the equipment to be tested;
the output end of the excitation module is connected with the input end of the equipment to be tested, the output end of the equipment to be tested is connected with the input end of the common mode choke, and the output end of the common mode choke is connected with the input end of the test module.
Further, the excitation module is used for outputting alternating current power supply voltage, and the alternating current power supply voltage is not more than 250V.
Further, the excitation module is further configured to change the polarity of the ac power supply voltage and output an ac power supply voltage with opposite polarity.
Furthermore, the equipment to be tested comprises an ME (equipment management) device and an application end, wherein the ME device is in signal connection with the application end, the ME device is medical electrical equipment, and the application end is a functional module carried on the medical electrical equipment.
Further, as shown in fig. 3, the LC filter is formed by connecting a ground wire and a capacitor in parallel.
Further, the common mode choke coil is used for canceling a common mode current signal in the output current of the output end of the device to be tested.
Further, the test module is used for dividing the output voltage of the output end of the common mode choke into two paths, and respectively obtaining peak voltages in the two paths.
Further, the peak voltage difference in the two paths is not more than 1V.
In a specific embodiment, the ME device for single phase or direct current supply network power supply comprises an internal power supply ME device which can also be connected to the supply network in a way that the maximum network supply voltage is the highest rated supply voltage; when the highest rated power supply voltage is less than 100V, the maximum network power supply voltage is 250V;
for a multiphase ME device, the maximum net supply voltage is the highest rated phase line-to-neutral voltage;
for other internally powered ME devices, the maximum mains supply voltage is 250V.
In a specific embodiment, the input voltage to the ME device should be the nominal voltage or a voltage within the nominal voltage range that produces the highest measurement. For the direct current voltage of the superimposed ripple waves, if the peak value of the ripple wave peak does not exceed 10% of the average value, the working voltage is the average value; if the peak value of the ripple peak exceeds 10% of the average value, the working voltage is the peak voltage. For each safeguard constituting the double insulation, the operating voltage is the voltage to which the whole double insulation is subjected. For an operating voltage without a grounded application terminal connection, the application terminal connection should be considered as normal. The operating voltage between the application terminal connection of the F-type application section and the housing is considered to be the highest voltage that occurs across the insulation under normal use including grounding of any component of the application section. For the defibrillation application portion, the operating voltage is determined without regard to the defibrillation voltage that may occur. A motor is provided with a capacitor and is capable of generating a resonance voltage between a connection point of a winding and the capacitor and any one of terminals of an external wiring, and the operation voltage should be equal to the resonance voltage.
In a specific embodiment, as shown in fig. 2, a test module circuit is provided, in which an application terminal is connected to a test module and other application terminals of the ME device are isolated for testing, and during a period of performing defibrillation discharge on the application terminal connected to the defibrillation prevention application part, test Y 1 And Y is equal to 2 Peak voltage at two points, Y 1 And Y is equal to 2 Dangerous electrical energy with peak voltage measured between two points not exceeding 1V and exceeding 1V is not found in:
(1) A housing including an application side lead and a connector on the cable when connected to the ME device; when the connection lead of the defibrillation application portion is disconnected from the ME device, the connection lead and its connector are not suitable;
(2) Any signal input/output section;
(3) Application-side connections of any other application part;
(4) Any unused or disconnected application part to be tested is connected, or any function of the same application part;
after the test voltage is applied, the ME equipment or the application terminals should keep basic safety and basic performance within the specified recovery time, and test is carried out on the ME equipment and each application terminal in turn to check whether the test is satisfactory.
In a specific embodiment, a test module circuit includes R 1 、R 2 、D 1 、D 2 、C 1 、C 2 、Y 1 、Y 2 And Z in Wherein R is 1 Is 1KΩ resistance, R 2 100KΩ resistance, D 1 、D 2 Is a small signal silicon diode, C 1 、C 2 1 mu F capacitance, Y 1 、Y 2 To be tested for point Z in Is internal resistance, Z in ＞1MΩ，V T For the test voltage, R 1 、R 2 Error + -2%, not lower than 2KΩ.
In a specific implementation placement, an ME device differential mode test apparatus includes: according to fig. 1, the ME equipment differential mode test apparatus is connected, and test voltages are applied to each application terminal including the defibrillation application section in turn through the excitation module, while all other application terminals of the other application sections are connected to the ground. And when the application part has only one application end connection, a differential mode test is not adopted.
During the above test period: in addition to permanently installing the ME equipment, the ME equipment and the application terminal are tested under the two conditions of connection and disconnection of the protection grounding module; measurement of Y 1 、Y 2 Peak voltage between two points.
The polarity of the test voltage of the excitation module is changed, each test is repeatedly carried out, and the ME equipment or the application end should keep basic safety and basic performance within a specified recovery time.
In a specific embodiment, the protective ground terminal in the ME device is grounded via the protective ground module. If the excitation module is used as a power connection for the ME device, the ground pin in the excitation module should be considered as a protective ground terminal.
In a specific embodiment, a common mode choke coil comprises a common mode inductor, is a common mode interference suppression device using ferrite as a magnetic core, and is formed by symmetrically winding two coils with the same size and the same number of turns on the same ferrite annular magnetic core to form a four-terminal device, wherein the four-terminal device has a suppression effect on the large inductance of a common mode signal and hardly has a function on the small leakage inductance of a differential mode signal. The principle is that when the common mode current flows, magnetic fluxes in the magnetic ring are overlapped with each other, so that the common mode current is restrained, and when the two coils flow through the differential mode current, the magnetic fluxes in the magnetic ring are mutually offset, and almost no inductance exists, so that the differential mode current can pass through without attenuation. Therefore, the common-mode inductor can effectively inhibit common-mode interference signals in the balanced line, and has no influence on differential-mode signals normally transmitted by the line.
In a specific embodiment, the utility model comprises an excitation module, equipment to be tested, a grounding module, a common mode choke coil and a test module, wherein the grounding module is a protective grounding module and an LC filter which are connected in parallel, and the grounding module is connected with the equipment to be tested; the output end of the excitation module is connected with the input end of the equipment to be tested, the output end of the equipment to be tested is connected with the input end of the common mode choke, and the output end of the common mode choke is connected with the input end of the test module and used for testing differential mode current signals existing in the equipment to be tested. Common mode radiated noise is generated by common mode voltage on the cable ports, and by the drive of the common mode voltage, common mode current flows from ground to the cable. The electric field strength of the radiation is inversely proportional to the distance of the cable from the observation point, and proportional to the frequency and the length of the cable. The ground impedance is reduced by using a ground plane on the circuit board, and an LC low pass filter or common mode choke is used at the port of the cable. In addition, minimizing the length of the cable and using shielded cables also reduces radiation. According to the utility model, the LC filter is formed by connecting the common mode choke coil in series and connecting the capacitor in parallel between the ground and the lead for filtering, so that common mode conduction noise is filtered, and the differential mode signal identification precision is improved. The output end of the excitation module is connected with the input end of equipment to be tested, the equipment to be tested comprises ME equipment and an application end, the ME equipment is in signal connection with the application end, and differential mode noise existing at different positions is tested by respectively grounding the ME equipment and the application end.
In a specific embodiment, an ME device differential mode test apparatus includes: the device comprises an excitation module, equipment to be tested, a grounding module, a common mode choke coil and a test module, wherein the grounding module is a protective grounding module and an LC filter which are connected in parallel, and the grounding module is connected with the equipment to be tested;
the output end of the excitation module is connected with the input end of the equipment to be tested, the output end of the equipment to be tested is connected with the input end of the common mode choke, and the output end of the common mode choke is connected with the input end of the test module. The equipment to be tested comprises an ME (equipment management) device and an application end, wherein the ME device is in signal connection with the application end, the ME device is medical electrical equipment, and the application end is a functional module carried on the medical electrical equipment.
The output end of the excitation module is connected with the input end of the ME equipment, other application ends are grounded, the differential mode noise of each part of the ME equipment is tested, the polarity of the test signal output by the excitation module is changed, the differential mode noise of each part of the ME equipment is tested, and the test signal is compared with the test signal by the comparison Y 1 、Y 2 The peak voltage between two points, the peak voltage difference between the two paths is not more than 1V, and the ME equipment or the application end should maintain basic safety and basic performance in a specified recovery time.
The output end of the excitation module is connected with the input end of a single application end, other application ends and ME equipment are grounded, differential mode noise of the application end is tested, the polarity of an output test signal of the excitation module is changed, the differential mode noise of the application end is tested, and Y is compared 1 、Y 2 The peak voltage between two points, the peak voltage difference between the two paths is not more than 1V, and the ME equipment or the application end should maintain basic safety and basic performance in a specified recovery time.
The LC filter is formed by connecting a grounding wire and a capacitor in parallel, the common mode choke coil is used for counteracting a common mode current signal in output current of an output end of equipment to be tested, and the LC filter and the common mode choke coil improve the detection precision of the differential mode signal.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An ME equipment differential mode test apparatus, comprising: the device comprises an excitation module, equipment to be tested, a grounding module, a common mode choke coil and a test module, wherein the grounding module comprises a protective grounding module and an LC filter which are connected in parallel, and the grounding module is connected with the equipment to be tested;
the output end of the excitation module is connected with the input end of the equipment to be tested, the output end of the equipment to be tested is connected with the input end of the common mode choke, and the output end of the common mode choke is connected with the input end of the test module.
2. The ME equipment differential mode test device of claim 1, wherein the excitation module is configured to output an ac power supply voltage, the ac power supply voltage not exceeding 250V.
3. The differential mode test device for an ME apparatus according to claim 2, wherein the excitation module is further configured to change the polarity of the ac power supply voltage and output an ac power supply voltage having an opposite polarity.
4. The differential mode test device for an ME device according to claim 1, wherein the device to be tested includes an ME device and an application end, the ME device is in signal connection with the application end, the ME device is a medical electrical device, and the application end is a functional module carried on the medical electrical device.
5. The differential mode test device for an ME plant according to claim 1, wherein the LC filter is formed by a ground wire and a capacitor in parallel.
6. The differential mode test device for an ME apparatus according to claim 1, wherein the common mode choke is configured to cancel a common mode current signal in an output current of the apparatus to be tested.
7. The differential mode test device for the ME equipment according to claim 1, wherein the test module is used for dividing the output voltage of the output end of the common mode choke coil into two paths, and respectively measuring peak voltages in the two paths.
8. The ME plant differential mode test apparatus of claim 7, wherein the peak voltage difference in the two paths is no more than 1V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321588173.0U CN220525924U (en) | 2023-06-20 | 2023-06-20 | ME equipment differential mode test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321588173.0U CN220525924U (en) | 2023-06-20 | 2023-06-20 | ME equipment differential mode test device |
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| CN220525924U true CN220525924U (en) | 2024-02-23 |
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| CN202321588173.0U Active CN220525924U (en) | 2023-06-20 | 2023-06-20 | ME equipment differential mode test device |
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| CN (1) | CN220525924U (en) |
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