Programmable electronic loads of direct and alternating current

When testing power supplies and converters, it is necessary to test the operability of all the circuits of the device under test in a wide range of operating loads. At the same time, it is not only the stability of the operating characteristics of the device under test that has a constant load value, but also the deviation from the nominal value of the main parameters of the device during rapid changes in the load value (dynamic test). Resistive loads, which have been used for several decades during testing, cannot fully solve the problem of studying the dynamic characteristics of a device under test (power sources after assembly or repair, voltage converters). To ensure testing in accordance with modern test methods, electronic loads must be applied.

Modern electronic loads are a fairly new class of measuring equipment that can be used in the experimental testing of various electrical switchgears, voltage converters and power supplies. The main difference between electronic loads and resistive load circuits (controlled and uncontrolled) is the ability to fully simulate the magnitude and loading graph in strict accordance with the technical specifications (technical conditions) and production standards of the enterprise. The loading in this case changes according to a previously prepared dynamic study schedule, and can be repeated cyclically (in the study of transients). Electronic loads not only maintain in automatic mode the value of the required electrical resistance as a loading parameter, but also track the current consumption (power) or the applied voltage to the load. All these parameters are available to the user when setting up electronic loads and when processing test results. All high-precision measurements using electronic loads are made in real-time mode (in real time). Controlled values ​​are displayed on the display, it is possible to transfer the experiment information to an external computer via a high-speed communication interface line. No need to use additional equipment. Electronic loads are a complete, complete solution when conducting test results.

Separately, it is worth mentioning how the electron energy uses the thermal energy released during the experiment. In resistive loads, the energy consumed went into heat and was simply dissipated, which often required external blowing and cooling. In electronic loads it is possible to return the electrical energy received from the tested sources to the public network. This is especially true when testing high-power generating devices (more than 3-5 kW), when cooling issues come to the fore. Electronic load recuperates into a public network up to 150 kW of electrolytic energy.

Electronic loads are able to work with devices and DC, and AC. For AC devices, in addition to modeling ohmic loads, you can set its character (active, rectifying, active-inductive). On the basis of a system of electronic loads of direct current and power sources controlled by the controller, they create systems for forming and testing batteries of various types.

Comments (0)