High-power DC power sources are rarely encountered in everyday life, but they are surprisingly close to us, as seen in common daily travel, such as high-speed trains. In fact, the application of high-power DC power sources can be observed during the operation of high-speed trains. 航空电源
High-Speed Train Braking Systems: Low-speed trains primarily utilize brake shoes for braking, which work by friction with the steel rails. High-speed trains (above 300 km/h) employ eddy current braking, where an electromagnetic set is lowered to within 10 centimeters of the steel rail during braking, and then powered up. This creates eddy currents that generate heat between the electromagnetic set and the rail, converting kinetic energy into thermal energy and dissipating it, thereby slowing down the train. The advantage of this braking method is that it is unaffected by increased speed at high speeds, maintaining a higher braking force. The drawback is that it generates a significant amount of heat, which can cause the tracks to overheat, requiring time for cooling and heat dissipation.
The braking module test bench requires power supply to the electromagnet, coordinating with a tensile sensor, temperature sensor, infrared distance meter, auxiliary power supply, and auxiliary hydraulic lifting device to complete the integrated control of the entire test bench via a master control unit. The experimental process sets the initial distance of the braking device rail, applies different voltage and current values from the power supply, measures the change in distance and the generated tensile force, and obtains the experimental results for evaluating the braking effect. 36V aviation power supply
During the electromagnet power-on test, since the main power supply for the electromagnets on the train is a constant current source, and the backup power supply is a constant voltage source, the power supply needs to operate in both constant voltage and constant current modes during testing. The single coil resistance is 0.4~0.5Ω, and the test requires 3~4 series connected power-on tests. The IT6500C series power supply is used as the power supply for the electromagnet, featuring CC and CV operating modes, adjustable loop speed and priority; during actual testing, the settings were 500V, 100A, with an actual output of 100V, 100A, and CC output from the power supply. When operating in CV mode, due to the inductive load of the electromagnet, it is prone to loop voltage oscillation. By setting the CV loop speed to low, the power supply can maintain a stable constant voltage output. Additionally, the open bottom protocol makes it easier for users to integrate and complete secondary development. 400HZ frequency conversion power supply.
