Showing papers on "Flyback converter published in 1975"

Improved single-ended regulated dc/dc converter circuit

Abstract: Three basic single-ended converter configurations are compared analytically and experimentally. The ringing-coil converter is recommended for low-power, high voltage, single output applications where low cost is essential. The single-ended half-wave transformer-coupled converter is recommended where the maximum output power is being squeezed for a given switching transistor power handling capability. The single-ended full-wave converter is recommended for applications with tight regulation, size, ripple and trouble voltage requirements.

Current limited self-saturating dc/dc converter

Abstract: Switching current spikes are limited in a self-saturating DC/DC converter by sensing the instantaneous switching element current to develop a cutoff signal at some predetermined current level which enables a cutoff circuit to quickly switch off the conducting switching element at that time.

A New Voltage to Frequency Converter

Abstract: The technique for improving the linearity between the input voltage and the frequency of oscillation is described. This improvement is accomplished by adding a control circuit to Concentional voltage-to-frequency converters. From the experimental results, the linearity of this converter was about 0.15 percent at the frequency of 1 MHz.

Linear a.c. measurements

Abstract: A highly linear AC to DC conversion system comprises a variable gain amplifier via which an AC signal to be converted is applied to an AC/DC converter. The output of the AC/DC converter is compared with a reference level and a control signal dependent on the difference therebetween adjusts the gain of the variable gain amplifier so as to reduce the difference. The output of the AC/DC converter is also applied to one input of a comparator, whose DC output is applied via the variable gain amplifier to the other input of the comparator. The variable gain amplifier has exactly the same gain for both AC and DC signals. It can then be shown that the DC output signal produced by the comparator is very accurately linearly related to the magnitude of the AC input signal.

Energy stabilization in a horizontal deflection circuit for a television receiver

Abstract: A thyratron-like gating device governs the current supplied to an inductance in energy-exchanging relation with the storage capacitor in a reactive horizontal sweep circuit. The gating device is triggered by a control pulse that is delayed with respect to the start of the flyback portion of the sweep cycle by an amount proportional to the magnitude of the voltage stored on the capacitor at the start of flyback. The control pulse is generated upon the coincidence of a first saw-tooth voltage triggered at the start of flyback and a second voltage derived from the magnitude of the pulse generated in a secondary winding of the deflection transformer at the start of flyback. Suitable gain control facilities limit the magnitude of the second voltage to a value that assures generation of the control pulse within the flyback interval.

Circuit arrangement for a dc to dc converter

Abstract: A circuit arrangement for a DC to DC converter has at least one switching transistor and one transformer. The transformer includes a primary winding which is connected in the collector circuit of the transistor and a secondary winding from which at least one stabilized DC voltage may be tapped by way of rectifiers. The switching transistor is actuated and blocked by way of a control component in dependence upon load. A voltage comparison device is provided for comparing the collector-emitted voltage of the switching transistor with a predetermined reference value, and upon overshoot of the reference voltage the collector-emitter voltage is analyzed for disconnection of the base current of the switching transistor.