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The widely used Boost type front-end Power factor correction (PFC) circuit for electric vehicle (EV) chargers has a common problem that, the bulky dc-bus capacitor will cause uncontrollable start-up surge current, which is a hidden trouble for system reliability. The reason for surge current is analyzed and a step-variable soft start control method is developed in this paper. A CPLD based phase shift...
Several topologies of high voltage input DC/DC power supply are investigated firstly in this paper and then a novel gate control strategy for cascade SiC MOSFET stack using a single standard gate driver is proposed. Thereafter, operation principles including both static sate and switching transitions are analyzed. The LTspice simulation results validate the analysis and show the availability of the...
For emerging high volume applications such as wireless sensor networks, energy harvesting, or consumer biometrics, bandgap voltage references in CMOS may be viewed in a more favorable light by semiconductor manufacturing due to their low cost, ruggedness, and availability of the predictable parasitic bipolar junction transistor (BJT). To generate a bandgap voltage (VBG) reference with a near zero...
A 24-segment current-steering transmitter with 3-tap pre-emphasis and linear auto-tuned active line terminations is presented. A linearized resistor-MOSFET termination structure for continuous impedance tuning is proposed to maintain an accurate output voltage level (σ=1%) and good impedance matching (σ=2%). This enables larger signal drive strengths thanks to more efficient supply utilization. The...
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