RU224014U1 - ELECTRONIC LOAD - Google Patents

Abstract

The utility model relates to a device for forming an active load when monitoring the parameters of DC and/or AC power supplies. The technical result is to increase the accuracy and reliability of the results of forming a given resistance. The declared electronic load contains a control board connected via outputs to switching boards and power switching boards, connected via inputs and outputs to a load input board, an interface for synchronizing load units and software updates, an RS-485 interface and fan control boards. Through the inputs, the control board is connected to the configuration board, power supply, load boards and power load boards, made on linear components and equipped with temperature sensors. Switching with the monitored object is carried out through backplanes and switching boards, and the monitored object is connected to the load input board through an electrical connector. 1 ill.

Description

The utility model relates to electrical engineering, namely to active loads designed to form electrical resistance when monitoring the parameters of DC and/or AC power supplies.

Currently, a large number of different electronic loads have been developed. The device “Load simulator for testing power supply systems” is known, described in RF patent No. 75755, 2008, which transmits the received electricity to the public power grid to power other consumers and solves the issue of recycling electricity received from the current source being tested. However, such a solution has a very complex design and control system, which results in high cost. This is not justified at low and medium powers (1-4000 W). This device can only be used stationary; there is no possibility of operational use.

A known device for testing power supply systems is US patent No. 3624489, 1970, containing a group of resistors that require physical connection and disconnection to establish a certain value of active resistance. This process must be repeated many times if tests are to be carried out at different power output levels. The disadvantages of such a device are high labor intensity, low accuracy of setting the electrical resistance, the inability to continuously change the load current from one level to another, and the inability to conduct dynamic tests.

This solution was chosen as a prototype.

The objective of the claimed solution is to reduce operating and time costs, as well as increase the accuracy of electrical resistance installation.

This goal is achieved due to the fact that the electronic load, containing a group of resistors, additionally contains a control board connected via outputs to switching boards and power switching boards, connected via inputs and outputs to the load input board, the load block synchronization interface and software update interface RS-485 and fan control boards, and through the inputs connected to the configuration board, power supply, with load boards and power load boards, made on linear components and equipped with temperature sensors, while the load boards and power load boards and switching boards and switching boards The power ones are connected through connecting boards to the load input board, to which the monitored object is connected.

The technical result of using the claimed solution is to reduce operating and time costs, as well as increase the accuracy and reliability of the results of forming a given resistance, due to the fact that the electronic load generates a user-programmed electrical resistance for the test object being tested (DC and/or AC power supply ) by parallel connection of linear components (resistors) located on the load boards. The control object is connected to the load input board, then the user, through the RS-485 software interface, sets the required resistance, after which the control board generates control signals for other nodes, connecting the control object with the necessary resistors on the load boards through switching boards and interconnection boards. The power supply generates the necessary voltages for the operation of the load nodes.

During the test, the control board generates control signals for the load input board, switching boards, and fan control board. After connecting to the control object, the control board maintains the specified resistance during possible temperature fluctuations using the cooling system. When the permissible rated current is exceeded, the electronic load is disconnected from the monitored object, which ensures safe operation.

The electronic load provides protection against overheating of elements, incorrect switching of resistors and exceeding the rated current, which ensures safe operation. The electronic load is designed for installation in mechanical structures of the 482.6 mm (19 inch) series. In addition, the electronic load contains a removable dust filter, ventilation holes, indicators of power availability and readiness for operation (emergency), electrical connectors for interfaces and the monitored object, a load address selection switch and a grounding terminal.

The claimed solution is a software-controlled unit that accurately generates a given electrical resistance and its commutation with the test object, which makes it possible to reduce the influence of the human factor on the accuracy of resistance setting and reduce the time spent on checking the functionality of the test object. Also, the claimed solution provides the ability to connect several electronic loads with each other, which makes it possible to test control objects of various types, including multi-channel ones.

The advantage of the claimed solution is the convenience and accuracy of setting the electrical resistance when testing DC and/or AC power supplies, low noise level during operation, ease of mounting the equipment being tested, and low load weight. The use of linear components in the solution ensures high accuracy of reproduction of the output current of the controlled objects; at the output connectors of controlled DC and/or AC power supplies, a linear current-voltage characteristic is ensured, regardless of the value of the specified resistance, due to the automatic switching of resistors with a nominal value corresponding to the specified resistance. The presence of software makes it possible to provide a convenient interface to the user for managing checks and displaying test results, setting electrical resistance, switching electrical resistance with the test object, automatically testing the electronic load, displaying messages about the state of the electronic load (accident, readiness for operation), automated checking of parameters the device being tested, maintaining a database of checks, generating reports on the results of checks and printing them.

The electronic load allows testing both under computer control and through other devices with an RS-485 interface.

The given solution is illustrated by drawings, where in Fig. 1 shows a block diagram of the device.

The electronic load contains:

1 - control board;

2 - load input board;

3 - configuration board;

4 - power supply;

5 - load boards;

6 - power load boards;

7 - connecting boards;

8 - switching boards;

9 - power switching boards;

10 - temperature sensor;

11 - fan control boards;

12 - fans;

13 - interface for synchronizing load blocks and software updates;

14 - RS-485 interface.

The electronic load contains a control board 1 connected to a load input board 2, a configuration board 3, a power supply 4, 5 load boards, 6 power load boards, 8 switching boards, 9 power switching boards, a temperature sensor 10, 11 fan control boards, an interface synchronization of load units and software updates 13, RS-485 interface 14. Switching boards 7 and 8 are connected to backplanes, which are connected to load boards 5 and 6. Power switching boards 9 are placed on the radiator, to which the temperature sensor 10 is attached. Backplanes 7 are connected to load input board 2, load boards 5 and 6, switching boards 8 and 9. Fan control board 11 is connected to fans 12. Power supply 4 powers the device nodes through control board 1. A control object is connected to load input board 2. Before connecting the control object, load boards 5 and 6 are disconnected from load input board 2 by default. The required resistance is set via the interface. Control board 1 generates the set resistance through switching boards 8 and 9, after which the control object is connected to the specified resistance through connecting boards 9 and load input board 2. Temperature sensors are installed on load boards 5 and 6, the output of which is connected to control board 1. Based on the readings of the load board sensors and temperature sensor 10, control board 1 generates a control signal to fan control boards 11, which adjust the speed of fans 12. Via the interface 13 the basic software of the electronic load is updated, as well as its connection to other similar electronic loads.

Before starting the test, the test object (DC and/or alternating current power source) is connected to the electronic load, the power is turned on, after which the electronic load carries out a self-diagnosis procedure. The indicators monitor the health of the electronic load. Then the required resistance is set and the controlled object is turned on.

The output signal parameters measured by the operator are compared with reference values. If the deviations of the measured parameters from the reference ones are within the established tolerances, the test object is considered suitable. If the measured parameters deviate beyond the tolerance limits, the test object is considered faulty. All signals measured as a result of the test are entered into a computer database, and on their basis a test card for the corresponding tested object is compiled.

Electronic load hardware operates automatically under the control of system and application software installed on a PC. Load electronic software is designed for:

- providing a convenient interface to the user for managing inspections and displaying inspection results;

- installation of electrical resistance;

- commutation of electrical resistance with the controlled object;

- automatic electronic load testing;

- indication of messages about the state of the electronic load (accident, readiness for operation);

- automated verification of the parameters of the device being tested;

- maintaining a database of inspections;

- generating reports based on the results of inspections and printing them.

Claims (1)

An electronic load containing a group of resistors, characterized in that it additionally contains a control board connected via outputs to switching boards and power switching boards, connected via inputs and outputs to a load input board, an interface for synchronizing load units and software updates, and an RS-485 interface and fan control boards, and through the inputs connected to the configuration board, power supply, with load boards and power load boards, made on linear components and equipped with temperature sensors, while the load boards and power load boards and switching boards and power switching boards through the boards the connecting ones are connected to the load input board, to which the tested object of control is connected.

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