CN110967578A

CN110967578A - Safe artificial power network circuit structure for electromagnetic compatibility pretesting

Info

Publication number: CN110967578A
Application number: CN201911068426.XA
Authority: CN
Inventors: 不公告发明人
Original assignee: Tianjin Yimai Technology Co Ltd
Current assignee: Tianjin Yimai Technology Co Ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-04-07

Abstract

The invention discloses a safe manual power supply network circuit structure for electromagnetic compatibility pretest, which is a specified 50 omega/50 uH +5 omega V manual power supply network circuit diagram, wherein C1 and C2 are arranged between a live wire L and a zero wire N in the circuit and a ground wire E, the total amount of two capacitors is 12uF, under a power supply 220V50Hz, the leakage current between the live wire and the zero wire and the ground wire is larger than 700mA, an isolation transformer B1 and a leakage protector DK1 are added on the basis of the specified circuit, the secondary side of an isolation transformer B1 can provide a path for the leakage current generated by C1 and C2, and the primary circuit of the transformer can not have the leakage current. Compared with the prior circuit, the circuit of the invention is safer to use and safe to operate. The method can improve the experimental efficiency when applied to factories and research and test mechanisms, and further shorten the research and development production process. The original specialized electromagnetic compatibility test can be applied more widely, and good economic benefit is generated.

Description

Safe artificial power network circuit structure for electromagnetic compatibility pretesting

Technical Field

The invention relates to the field of circuit structures, in particular to a safe artificial power network circuit structure for electromagnetic compatibility pretesting.

Background

The artificial power supply network is also called a power supply impedance stabilizing network, is important electromagnetic compatibility testing equipment and is mainly used for measuring continuous disturbance voltage transmitted by tested equipment to a power grid along a power supply line. The artificial power supply network provides a defined impedance to the device under test in the radio frequency range and isolates the device under test from unwanted high frequency interference on the power grid, and then couples the disturbance voltage to the receiver.

In the GB6113.102 standard, a circuit diagram of a 50 Ω/50uH +5 Ω V type artificial power supply network is shown in fig. 2, in this circuit, there are C1 and C2 between the live wire L and the neutral wire N and the ground wire E, and the total of the two capacitors is 12uF, and under the power supply 220V50Hz, a leakage current of more than 700mA between the live wire and the neutral wire and the ground wire is caused. This leakage current will cause the power supply leakage protector to operate. Therefore, a leakage protector cannot be added in the design of a power distribution circuit in an electromagnetic compatibility certification laboratory before an artificial power supply network. Thereby also presenting a safety risk of electric shock. Generally, an electromagnetic compatibility certification laboratory sets safety warnings and strict operation procedures through a fixed equipment discharge position, and avoids safety risks relative to fixed operators.

Besides an electromagnetic compatibility certification laboratory, the electronic factory, a research and test institution and the like have huge electromagnetic compatibility pretesting (touch-down test) requirements, and the manual power supply network of the circuit is also applied to the places, so that the conditions of the places are uneven, personnel are difficult to fix, the touch-down test requires efficiency, frequent tests are required, and the field is difficult to operate according to a strict operation flow. In the manual power supply network applied in the places, because the leakage protector cannot be added, great potential safety hazard exists, and risks of causing personnel to shock by electricity, burning of the tested circuit and even causing fire hazard exist, so that research and development personnel are reluctant to operate the test by themselves, even if the test is carried out carefully and slightly, the work efficiency is hardly improved, and further the research and development production process is influenced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a safe artificial power network circuit structure for electromagnetic compatibility pretesting, which is mainly used for solving the potential safety hazard caused by applying an artificial power network with an original circuit structure in an electronic factory and a research and test institution.

In order to achieve the purpose of the invention, the invention adopts the technical scheme that:

a safe manual power supply network circuit structure for electromagnetic compatibility pretest is a specified 50 omega/50 uH +5 omega V manual power supply network circuit diagram, wherein C1 and C2 are arranged between a live wire L and a zero wire N in the circuit and a ground wire E, the total amount of the two capacitors is 12uF, under a power supply 220V50Hz, the leakage current between the live wire and the zero wire and the ground wire is larger than 700mA, an isolation transformer B1 and a leakage protector DK1 are added on the basis of the specified circuit, the secondary side of the isolation transformer B1 can provide a path for the leakage current generated by C1 and C2, and the primary circuit of the transformer cannot have the leakage current.

The invention has the beneficial effects that:

in the circuit, an isolation transformer B1 and a leakage protector DK1 are added on the basis of a specified circuit, the secondary side of an isolation transformer B1 can provide a path for leakage currents generated by C1 and C2, the primary circuit of the transformer can not have leakage currents, and then a client can add the leakage protector on a power supply loop at the input side of a novel artificial power supply network. After the novel artificial power supply network shell is integrated, the leakage current loop is arranged inside the shell. The potential safety hazard of leakage of the input circuit is solved. Increase earth leakage protector DK1 at original circuit output side, in case the protection is in order to receive the test equipment electric leakage, DK1 can move, can prevent that the circuit under test from burning out, and protection operating personnel's personal safety avoids the electric shock. The potential safety hazard of leakage of the output circuit is also solved. Thus, as a whole, the novel artificial power supply network has no more various risks caused by electric leakage.

Drawings

FIG. 1 is a schematic diagram of the circuit structure of the present invention;

fig. 2 is a conventional circuit configuration diagram of the present invention.

Detailed Description

In order to make the content of the present invention more clearly understood, 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.

As shown in fig. 1 and 2, as shown in fig. 1, an isolation transformer B1 and a leakage protector DK1 are added to the circuit based on a predetermined circuit (as shown in fig. 2), and a secondary side of the isolation transformer B1 can provide a path for leakage currents generated by C1 and C2, so that no leakage current exists in a primary circuit of the transformer, and a leakage protector can be added to an input-side power supply loop of the novel artificial power supply network by a client. After the novel artificial power supply network shell is integrated, the leakage current loop is arranged inside the shell. The potential safety hazard of leakage of the input circuit is solved. Increase earth leakage protector DK1 at original circuit output side, in case the protection is in order to receive the test equipment electric leakage, DK1 can move, can prevent that the circuit under test from burning out, and protection operating personnel's personal safety avoids the electric shock. The potential safety hazard of leakage of the output circuit is also solved. Thus, as a whole, the novel artificial power supply network has no more various risks caused by electric leakage.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A safe electromagnetic compatibility pretest uses the artificial power network circuit structure, the artificial power network circuit diagram of 50 omega/50 uH +5 omega V type stipulated, there are C1 and C2 between live wire L and zero line N and earth wire E in this circuit, two electric capacity are counted and there is 12uF, under 220V50Hz of power supply, will cause the leakage current greater than 700mA between earth wire and live wire and zero line, characterized by that, increase the isolating transformer B1 on the basis of stipulated circuit, the protector DK1 of the leakage, the secondary of isolating transformer B1 can offer the route for the leakage current that C1 and C2 produce, the primary circuit of the transformer will not have leakage current any more.