Transductor

Abstract: Preface. 1. Introduction. 2. Filter Synthesis for (very) High Frequencies. 3. Effect of Non-Idealities. 4. Transductor Design. 5. Tuning. 6. Filter Realizations. 7. Conclusions. References. Subject Index.

Abstract: A multi-phase power supply utilizes a current sensor including a sensor inductor winding connected in parallel with a filter inductor winding at the output of each phase for sensing the phase currents and balancing the current by adjusting the duty cycle of each phase through feedback control. In addition, in a multi-module power supply configuration, current between power supply modules is balanced through use of the same current sensor and current sharing technique. Each phase of the power supply includes at least one input power source and a current sensor. The sensor inductor winding and the filter inductor winding have the same number of turns and are wound about a magnetic core also present at each phase. A differential amplifier at each phase senses and amplifies any voltage difference between the outputs of the sensor inductor winding and the corresponding filter inductor winding. A current-sharing bus is formed between each of the phases, carrying the summed and averaged outputs from all the differential amplifiers. A feedback correction circuit at each phase utilizes the voltage on the current-sharing bus as a reference to control a pulse width modulator in adjusting the duty cycle of the corresponding phase, thereby balancing the load current among the phases. In a multi-module, multi-phase power supply, the current-sharing bus and a voltage-sharing bus are extended between each module and the phases of each module to achieve the same current balancing between all phases and modules.

Abstract: The supply voltage regulator, for a television receiver's line output stage, has a transductor as variable impedance to regulate and stabilise the supply voltage. The transductor is connected by one half between the input supply and over a booster diode to the line transformer, and by the other half between +24V and its control voltage. The control voltage is derived from the line transformer's booster capacitor. This regulating method is only possible for output stages with voltage or IV feedback and with booster diodes carrying supply-current pulses; it cannot be used with output stages that are supplied directly with pure d.c. currents.