阅读说明：本技术 一种用于模拟信号电磁兼容防治的系统及方法 (System and method for electromagnetic compatibility prevention and control of analog signals ) 是由 王鹏 李川 于 2020-03-31 设计创作，主要内容包括：本发明公开了一种用于模拟信号电磁兼容防治的系统及方法,属于自动化控制监控系统的技术领域,通过对模拟信号传感器的输入电源进行电源传导发射防治；对模拟信号传感器的信号输入进行空间辐射低频保护和空间辐射高频保护,对模拟信号传感器的信号输出进行空间辐射低频保护和空间辐射高频保护；对模拟信号传感器进行接地保护,以避免因空间辐射和电源传导发射的干扰,提高模拟信号传感器的抗辐射干扰能力,进而保护模拟信号传感器能够正常工作。(The invention discloses a system and a method for electromagnetic compatibility prevention and control of analog signals, which belong to the technical field of automatic control monitoring systems, and are used for performing power conduction emission prevention and control on an input power supply of an analog signal sensor; performing space radiation low-frequency protection and space radiation high-frequency protection on the signal input of the analog signal sensor, and performing space radiation low-frequency protection and space radiation high-frequency protection on the signal output of the analog signal sensor; the analog signal sensor is subjected to ground protection, so that interference caused by space radiation and power conduction emission is avoided, the anti-radiation interference capability of the analog signal sensor is improved, and the analog signal sensor is protected from normal operation.)

1. A system for electromagnetic compatibility prevention and control of analog signals comprises an analog signal sensor and is characterized by further comprising a power conduction emission prevention and control module, a space radiation low-frequency protection module and a space radiation high-frequency protection module which are respectively connected with the analog signal sensor, wherein the power conduction emission prevention and control module is used for performing power conduction emission prevention and control on an input power supply of the analog signal sensor;

the space radiation high-frequency protection module is used for performing space radiation high-frequency protection on the signal input and the signal output of the analog signal sensor;

the space radiation low-frequency protection module is used for performing space radiation low-frequency protection on the signal input and the signal output of the analog signal sensor.

2. The system for analog signal electromagnetic compatibility prevention of claim 1 further comprising a metal shielding shell covering an exterior of said analog signal sensor, said metal shielding shell being grounded to prevent spatial radiation from entering the analog signal sensor.

3. The system for analog signal electromagnetic compatibility prevention according to claim 1, wherein said power conduction emission prevention module comprises a common mode choke and a filter, said common mode choke being connected to the filter, the other end of the filter being connected to the analog signal sensor.

4. The system for analog signal electromagnetic compatibility prevention and treatment as defined in claim 1, wherein the spatial radiation low frequency protection module comprises a low frequency filter and a magnetic bead, the low frequency filter is connected with the magnetic bead, and the magnetic bead is connected with the analog signal sensor.

5. The system for electromagnetic compatibility prevention and treatment of analog signals according to claim 1, wherein the space radiation high-frequency protection module comprises a high-frequency filter and a feedthrough capacitor, the high-frequency filter is connected with the feedthrough capacitor, and the feedthrough capacitor is connected with the high-frequency filter.

6. A method for electromagnetic compatibility prevention of analog signals, the method comprising:

performing power conduction emission prevention and control on an input power supply of the analog signal sensor;

performing space radiation low-frequency protection and space radiation high-frequency protection on the signal input of the analog signal sensor, and performing space radiation low-frequency protection and space radiation high-frequency protection on the signal output of the analog signal sensor;

and carrying out ground protection on the analog signal sensor.

7. The method for analog signal electromagnetic compatibility prevention of claim 6, wherein the power conducted emission prevention comprises:

common mode choke coil is used for inhibiting common mode noise from being connected into the power supply part of the analog signal sensor in series, and a filter is used for filtering common mode interference and differential mode interference from an input power supply.

8. The method for analog signal electromagnetic compatibility prevention and treatment according to claim 6, wherein said spatial radiation low frequency protection comprises:

the signal input of the analog signal sensor is sequentially subjected to low-frequency interference filtering and attenuation through a low-frequency filter and magnetic beads;

and the signal output of the analog signal sensor is subjected to low-frequency interference filtering and attenuation sequentially through the magnetic beads and the low-frequency filter.

9. The method for electromagnetic compatibility prevention of analog signals according to claim 6, wherein said spatial radiation high frequency protection comprises:

the signal input of the analog signal sensor is sequentially subjected to high-frequency interference filtering and attenuation through a high-frequency filter and a feedthrough capacitor;

and the signal output of the analog signal sensor is subjected to high-frequency interference filtering and attenuation through the feedthrough capacitor and the high-frequency filter in sequence.

10. The method for analog signal electromagnetic compatibility prevention of claim 6, wherein the ground protection is through a metal shield on an outer cover of the analog signal sensor, the metal shield being used to prevent space radiation from entering the analog signal sensor.

Technical Field

The invention belongs to the technical field of automatic control monitoring systems, mainly relates to on-line monitoring, external and internal environment monitoring and protection of the whole working process, is suitable for automatic control equipment with high requirements on safety and reliability, and particularly relates to a system and a method for electromagnetic compatibility prevention and control of analog signals.

Background

Currently, in medical electrical equipment, electronic and information technologies are well applied, communication technologies are also well applied in the social production and living fields, and the medical electrical equipment faces a complex electromagnetic environment. Peripheral equipment electromagnetic radiation can interfere with the use of medical electrical equipment, can seriously affect the use performance of the equipment, even cause medical accidents, and can adversely affect the operation of communication and other equipment due to electromagnetic energy of the peripheral equipment once the electromagnetic compatibility fails to meet the safety standard.

With the progress of the times, the full-automatic blood component collection system adopts a working mode based on an upper computer and a lower computer, introduces a large number of sensors and actuating mechanisms, monitors and intervenes the whole process of blood plasma collection, and realizes high automation. Therefore, the fully automatic blood component collection system is exposed to a more complicated electromagnetic environment, and the electromagnetic energy radiated to the outside by the system must be reduced.

The existing full-automatic blood component collection system largely adopts an analog signal sensor as a monitoring unit, so that the current full-automatic blood component collection system has the following problems in a complex electromagnetic environment:

(1) abnormal states of the equipment, especially sporadic abnormalities, cause blood waste or infection risks to blood staffs;

(2) data abnormality occurs in the equipment, particularly the abnormality of a monitoring system can cause misjudgment and misoperation of an acquisition system, and cause mental panic and blood waste to blood staffs;

(3) the equipment can cause the transmission exceeding standard, influence the normal work of other equipment and even pollute the power grid;

(4) the equipment can cause radiation emission to exceed the standard, and the life safety of blood staffs is damaged.

Disclosure of Invention

In view of the above, in order to solve the above problems in the prior art, an object of the present invention is to provide a system and a method for electromagnetic compatibility prevention and control of analog signals, so as to achieve the purpose of protecting the analog signal sensor from normal operation against interference of space radiation and power conducted emission.

The technical scheme adopted by the invention is as follows: a system for electromagnetic compatibility prevention and control of analog signals comprises an analog signal sensor, a power conduction emission prevention and control module, a space radiation low-frequency protection module and a space radiation high-frequency protection module, wherein the power conduction emission prevention and control module, the space radiation low-frequency protection module and the space radiation high-frequency protection module are respectively connected with the analog signal sensor;

the space radiation high-frequency protection module is used for performing space radiation high-frequency protection on the signal input and the signal output of the analog signal sensor;

the space radiation low-frequency protection module is used for performing space radiation low-frequency protection on the signal input and the signal output of the analog signal sensor.

Furthermore, the device also comprises a metal shielding shell covering the outside of the analog signal sensor, the metal shielding shell is grounded nearby to prevent space radiation from entering the analog signal sensor, static electricity brought by blood staffs or workers is released to the ground, the radiation interference of the space can be shielded, and the radiation interference of the space by the analog sensor can be shielded.

Further, the power conduction emission prevention and control module comprises a common mode choke coil and a filter, the common mode choke coil is connected with the filter, and the other end of the filter is connected with the analog signal sensor, so that the input power supply of the analog signal sensor is free from being influenced by an external power supply.

Further, the space radiation low-frequency protection module comprises a low-frequency filter and a magnetic bead, the low-frequency filter is connected with the magnetic bead, the magnetic bead is connected with the analog signal sensor, and interference of space low-frequency radiation on the analog signal sensor can be effectively reduced through low-frequency protection of the space radiation.

Furthermore, the space radiation high-frequency protection module comprises a high-frequency filter and a feedthrough capacitor, the high-frequency filter is connected with the feedthrough capacitor, and the feedthrough capacitor is connected with the high-frequency filter.

The technical scheme of the invention also provides the following steps: a method for analog signal electromagnetic compatibility prevention, the method comprising:

performing power conduction emission prevention and control on an input power supply of the analog signal sensor;

performing space radiation low-frequency protection and space radiation high-frequency protection on the signal input of the analog signal sensor, and performing space radiation low-frequency protection and space radiation high-frequency protection on the signal output of the analog signal sensor;

and carrying out ground protection on the analog signal sensor.

Further, the power conduction emission control comprises:

common mode choke coil is used for inhibiting common mode noise from being connected into the power supply part of the analog signal sensor in series, and a filter is used for filtering common mode interference and differential mode interference from an input power supply.

Further, the spatial radiation low frequency protection comprises:

the signal input of the analog signal sensor is sequentially subjected to low-frequency interference filtering and attenuation through a low-frequency filter and magnetic beads;

the signal output of the analog signal sensor is sequentially subjected to low-frequency interference filtering and attenuation through the magnetic beads and the low-frequency filter;

the interference of the space low-frequency radiation to the analog signal sensor is effectively reduced.

Further, the spatial radiation high frequency protection comprises:

the signal input of the analog signal sensor is sequentially subjected to high-frequency interference filtering and attenuation through a high-frequency filter and a feedthrough capacitor;

the signal output of the analog signal sensor is sequentially subjected to high-frequency interference filtering and attenuation through the feedthrough capacitor and the high-frequency filter;

the interference of the space high-frequency radiation to the analog signal sensor is effectively reduced.

Furthermore, the metal shielding shell is covered on the external part of the analog signal sensor in the grounding protection mode, and is used for preventing and controlling space radiation from entering the analog signal sensor, so that the antistatic and anti-radiation interference capability of the analog signal sensor is improved.

The invention has the beneficial effects that:

1. by adopting the system and the method for preventing and controlling the electromagnetic compatibility of the analog signal, common-mode and differential-mode signals conducted through a power line can be attenuated and filtered under the action of a power conduction emission preventing and controlling part, a space radiation low-frequency protecting part and a space radiation high-frequency protecting part, and a low-noise power supply is provided for the analog signal sensor so that the analog signal sensor is in a safe working environment; the radiation interference signals radiated to the analog signal sensor in space can be attenuated and filtered, the influence of the radiation interference signals in space on the normal work of the analog signal sensor is avoided, and the radiation interference resistance of the analog signal sensor is improved.

Drawings

FIG. 1 is a block diagram of the overall system architecture of a system for analog signal electromagnetic compatibility prevention provided by the present invention;

FIG. 2 is a block diagram of a power conduction prevention module in the system for electromagnetic compatibility prevention of analog signals according to the present invention;

FIG. 3 is a block diagram of a spatial low-frequency protection module in the system for electromagnetic compatibility prevention and control of analog signals according to the present invention;

FIG. 4 is a block diagram of a space high-frequency protection module in the system for electromagnetic compatibility prevention and control of analog signals according to the present invention;

fig. 5 is a block diagram of a ground protection in the system for electromagnetic compatibility prevention and control of analog signals according to the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar modules or modules having the same or similar functionality throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the application include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.