Design and implementation of the compact main circuit of IGBT-based converter
The compact main circuit has many advantages, such as reducing volume and weight, saving costs and convenient for transportation. This paper presents three key problems including switching power supply, sampling and protection system, and cooling system. Through simplifying circuit and optimizing device parameters, the switching power supply can provide multiplex regulated power supplies with 540 VDC input directly. A simple circuit based on ripple principle can detect missing phase of input fault easily. The heat sink can be designed in a small volume through selecting suitable cooling fans, reducing switching frequency and setting minimum pulse width. A 15 kW converter has been designed and implemented based on the above. Furthermore, this main circuit has been proved by practical application and long-term reliable operation.
The microscopic trapping processes involved in 1/f noise are analyzed by studying the average switching times in the random telegraph signals of μm‐sized MOSFETs. The single‐electron transfer into and out of interface traps shows strongly temperature‐activated time constants. The results are interpreted by thermionic emission across the interface and by a free‐energy change in the capacitor system. The behavior is demonstrated on the example of two typical interface traps showsing differing time constant dependencies on the gate bias voltage. The key information is obtained from the trap energy shift with applying a substrate bias voltage to the MOSFET.