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Almost all PWM converters using bipolar transistors experience the problem of reverse transistor conduction. This effect is analysed for various types of base drive. It is shown to be most serious for low impedance direct drives. A mathematical model is developed for this case and verified experimentally. Problems associated with turn-on and turn-off in the reverse conduction mode are investigated.
The validity of applying state-space averaging and linearization to the control law of current-injected switching regulators for designs with wide-band, first-order, open-loop responses without RHP zeroes is verified. Quantitative closed-loop performance comparisons are made of current-injected versus voltage control for the boost and buck switching regulator topologies.
Power converters with free-running current-mode control (hysteretic, constant-“off”- time, or constant-“on”-time) can be frequency-stabilized or can be synchronized to a reference frequency. Those can by accomplished by feedforward, feedback, or phase-locking techniques. With hysteretic control, the frequency is controlled by varying the current hysteresis. With constant-“off”-time or constant-“on”-time...
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