CN210005602U

CN210005602U - variable load circuit device with current monitoring

Info

Publication number: CN210005602U
Application number: CN201920370623.6U
Authority: CN
Inventors: 王丽娜; 张曹卿; 徐吻伟; 苏吉华
Original assignee: Ningbo Ceprei Information Industry Technology Research Institute Co Ltd
Current assignee: Ningbo Ceprei Information Industry Technology Research Institute Co Ltd
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2020-01-31
Anticipated expiration: 2029-03-22

Abstract

The utility model provides take current monitoring's variable load circuit device guarantees through converting resistance (R) to set for output current value, including a plurality of resistances (R) that supply to choose for use, supply with ammeter (1) that the resistance (R) series connection that choose for use was used for monitoring output current, the positive and negative both ends of every resistance (R) are equallyd divide with the positive and negative both ends of ammeter (1) and are do not set up terminal (2), compare with prior art, the utility model discloses shorten the cable length between load and adapter, reduced the radiation disturbance that arouses by the cable, it is convenient to concatenate between load and the ammeter, has improved efficiency for the EMC test.

Description

variable load circuit device with current monitoring

Technical Field

The utility model belongs to the technical field of circuit and test, concretely relates to variable load circuit device with current monitoring.

Background

When the electromagnetic interference performance of the adapter product is tested according to the standard GB/T9254-2008 (also called EMI test), the working state of the adapter product is required to be rated output current, a proper load needs to be found during the test, and an ammeter is connected in series to monitor the output current. The common slide rheostat changes the resistance value through the length of a resistance wire of an access circuit part, however, a long cable is easy to cause radiation disturbance after being electrified, and the test result of the radiation disturbance field intensity in an electromagnetic compatibility experiment is influenced.

Disclosure of Invention

The utility model aims to solve the technical problem that to above-mentioned technical current situation, provide variable load case with current display.

The utility model provides a technical scheme that above-mentioned technical problem adopted does:

variable load circuit device with current monitoring guarantees through converting resistance (R) to set for output current value, including resistance (R) of a plurality of different resistances that supply to choose for use, supply with ammeter (1) that resistance (R) series connection that chooses for use was used for monitoring output current, and the positive and negative both ends of every resistance (R) are equallyd divide with the positive and negative both ends of ammeter (1) and are set up terminal (2) respectively.

The ammeter (1) is a mechanical pointer type ammeter (1).

The resistor (R) is a strip-shaped cement resistor (R).

Comprising pairs of vacant terminals (2) for connecting the variable resistor (R).

The number of the resistors (R) is set to 6, and the resistance values are respectively 0.5 omega, 1 omega, 2 omega, 2.5 omega, 5 omega and 10 omega.

Including square quick-witted case (3), a plurality of resistances (R) that supply to choose for use arrange in quick-witted case (3), terminal (2) all set up in quick-witted case (3) upper surface, and ampere meter (1) sets up openly at quick-witted case (3).

The binding posts (2) comprise 12 binding posts (2) at the positive end and the negative end of a resistor (R) with different resistance values and 2 binding posts (2) at the positive end and the negative end of the ammeter (1).

Compared with the prior art, the utility model discloses shorten the cable length between load and adapter, reduced the radiation harassment that arouses by the cable. The load and the ammeter are conveniently connected in series, and the efficiency is improved for EMC testing.

Drawings

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

FIG. 2 is a schematic circuit diagram of the circuit of FIG. 1 with the addition of a post for connection to an indeterminate resistance (R);

FIG. 3 is a schematic diagram of the circuit of the present invention installed in a square case;

FIG. 4 is a schematic diagram of an overall circuit arrangement for testing the electromagnetic interference performance of an adapter-like product;

Detailed Description

Hereinafter, a specific embodiment of the present invention will be described with reference to fig. 1 to 4.

As shown in figure 1, variable load circuit devices with current monitoring are used for testing electromagnetic interference performance (also called EMI test) of adapter products, set output current value is guaranteed by changing resistors (R), the variable load circuit devices comprise a plurality of resistors (R) with different resistance values for selection, and an ammeter (1) which is connected with the selected resistors (R) in series and used for monitoring the output current, binding posts (2) are respectively arranged at the positive end and the negative end of each resistor (R) and the positive end and the negative end of the ammeter (1), the ammeter (1) selects a mechanical pointer type ammeter (1), the resistors (R) can select strip-shaped cement resistors (R), the cement resistors (R) are stable in resistance value, low in price and convenient to purchase, and the number and the resistance value of the resistors (R) can be set according to the demand condition.

As shown in figure 1, preferred embodiments of the utility model, resistance (R) set up to 6 cement resistance (R), the resistance is 0.5 omega, 1 omega, 2 omega, 2.5 omega, 5 omega, 10 omega respectively, as shown in figure 3, can set up the variable load circuit device of this embodiment in square quick-witted case (3), also call it as load box, a plurality of cement resistance (R) of different resistances that supply to choose for use arrange in quick-witted case (3), can arrange the interior back of setting at quick-witted case (3) upper cover plate specifically, terminal (2) all set up in quick-witted case (3) upper surface, the connection electric wire of each cement resistance (R) and its terminal (2) can pass quick-witted case (3) upper cover plate and realize the connection, ammeter (1) set up in quick-witted case (3) front, the connection electric wire of ammeter (1) and its terminal (2) can pass quick-witted case (3) positive panel, upper realization connection, the connection of cover plate, ammeter (2) and the terminal (2) including the resistance of different terminal (R) can pass through the quick-witted case (2) positive and negative terminal (2) of the cement resistance value of the cement resistance and the test more than the required electric current output, thereby the cement resistance (R) obtains the independent output test more than the combination of the cement resistance (R) and the cement resistance (2) of the required to be connected in the cement resistance to be tested, thereby, the cement resistance (R) and more than the series connection of the cement resistance (2), the cement resistance (R) obtain the series connection of the cement resistance (2), the testing more than the required.

In addition, as shown in fig. 2, pairs of vacant terminals (2) for connecting the variable resistor (R) can be provided to compensate the shortage of the resistance configuration of the resistor (R).

During testing, as shown in fig. 4, the whole circuit device for testing the electromagnetic interference performance of the adapter product comprises an artificial power supply network, an EMI receiver, an adapter to be tested and a load box, wherein the artificial power supply network is also called a power supply impedance stabilizing network and is important electromagnetic compatibility testing equipment which is mainly used for measuring continuous disturbance voltage transmitted by a tested switching power supply to a power grid along a power supply line.

Claims

The variable load circuit device with the current monitoring function comprises a plurality of resistors (R) which are supplied with different resistance values and used for being connected in series with the selected resistor (R) to monitor output current, wherein the positive and negative ends of each resistor (R) and the positive and negative ends of the ammeter (1) are respectively provided with a binding post (2).
2. A circuit arrangement as claimed in claim 1, characterized in that the current meter (1) is a mechanical pointer current meter (1).
3. A circuit arrangement as claimed in claim 1, characterized in that the resistor (R) is a cement resistor (R) in the form of a bar.
4. A circuit arrangement as claimed in claim 1, characterized in that it comprises pairs of free terminals (2) for connection of the indefinite resistance (R).
5. A circuit arrangement as claimed in claim 1, characterized in that the resistors (R) are arranged in 6 with a resistance of 0.5 Ω, 1 Ω, 2 Ω, 2.5 Ω, 5 Ω, 10 Ω, respectively.
6. The circuit device according to claim 1, characterized by comprising a square case (3), a plurality of selectable resistors (R) with different resistance values are arranged in the case (3), the binding posts (2) are arranged on the upper surface of the case (3), and the ammeter (1) is arranged on the front surface of the case (3).
7. A circuit arrangement as claimed in claim 1, characterized in that the resistors (R) are arranged in 6 numbers with respective resistances of 0.5 Ω, 1 Ω, 2 Ω, 2.5 Ω, 5 Ω, 10 Ω; the binding posts (2) comprise 12 binding posts (2) at the positive end and the negative end of a resistor (R) with different resistance values and 2 binding posts (2) at the positive end and the negative end of the ammeter (1).
8. A circuit arrangement as claimed in claim 1, characterized in that the terminals (2) further comprise pairs of terminals (2) which are free for connection of an indefinite resistance (R).