Research Of The Electronic Load

Into the 21st century, widely used in a variety of power production and all aspects of life, how to assess the merits of the power becomes a growing concern. Traditional analog electronic load, from resistors, capacitors and inductors and other components integral to the cost of the energy consumption of the power supply assessment as a way, this method is not only a waste of energy, but also spend a lot of manpower and resources to be managed. DSP-based electronic load, is the traditional analog electronics based on the use of power electronics technology, computer control technology and power system automation design, using digital control loop instead of analog control link to achieve a variety of power supplies used to carry out assessment of the experimental device. DSP-based electronic load with traditional analog resistive load compared to high automation, small size, high efficiency in a variety of AC and DC power supplies, communications, automotive, batteries and other areas have been well applied, and gradually become research hot spots. DSP-based electronic load from the load plate, digital controller, detection and drive circuits, communication circuits etc. By varying the size of gate voltage , to achieve a stable power supply and test the related parameters of control.Articles from DC Electronic Load System program analyzes the detailed discussion of the entire system of hardware circuitry and software implementations, and gives a more reasonable solution. In order to facilitate the realization of control and function of the expansion, using the U.S. Ti' s TMS320LF2812 as the core controller designed to control the circuit, detection circuit, keyboard circuit, display circuit, communication circuit and driver circuit for the initial design of the PI controller robustness is not strong, and accuracy is not high shortcomings, but also introduced a series of advanced control algorithms to improve the control effect, the final use of software and hardware coordination to achieve the overall design. The main control idea is to use DSP output voltage signal of different sizes, By varying the size of gate voltage to regulate the flow through the FET current and the voltage across power supply being tested to achieve constant current, constant voltage, constant resistance and other operating modes.Late in the experiment, debugging results of the software and hardware show that this design can supply 100W in the constant current and constant voltage mode.