scispace - formally typeset
Search or ask a question

Showing papers on "Flyback converter published in 1970"


Patent
Minas Deranian1
29 Sep 1970
TL;DR: In this article, a plurality of DC to DC converter circuits are coupled to respond to pulses occurring at substantially different points in time, each circuit producing a high level DC voltage from a low level voltage.
Abstract: A plurality of DC to DC converter circuits are coupled to respond to pulses occurring at substantially different points in time, each circuit producing a high level DC voltage from a low level DC voltage. The high level DC voltage from each of the converter circuits are coupled to a filter which provides a transient free waveform at an output terminal. The duty cycle provided for each of the converter circuits allows minimal size components to be used while obtaining a high power output.

13 citations


Patent
Robert E Mast1
14 Dec 1970
TL;DR: In this paper, an improved high-efficiency D.C-to-D.C. converter circuit uses a single transistor to provide both level conversion and output regulation, and a control winding on a saturable core inductor alters the recycle time of the converter to control the level of magnetic flux in an output transformer.
Abstract: An improved high-efficiency D.C.-to-D.C. converter circuit uses a single transistor to provide both D.C. level conversion and output regulation. A control winding on a saturable core inductor alters the recycle time of the converter to control the level of magnetic flux in an output transformer per cycle of operation.

13 citations


Patent
21 Dec 1970
TL;DR: In this paper, a sub-synchronous static converter cascade with a slip-ring motor and a static frequency converter connected to the rotor of the motor is presented, in which a resistor and a voltage-controlled thyristor switch forming a series circuit are connected in parallel with the static converter.
Abstract: A sub-synchronous static converter cascade with a slip-ring motor and a static frequency converter connected to the rotor of the motor in which the converter comprises a diode rectifier and a static converter operating as a mains-controlled static converter. A resistor and a voltage-controlled thyristor switch forming a series circuit is connected in parallel with the static converter, and a high-speed circuit breaker bridged by a second resistor is connected between the diode rectifier and the junction of the thyristor switch with the static converter.

10 citations


Patent
22 Jun 1970
TL;DR: In this article, an electrical circuit for periodically and essentially randomly flashing a plurality of gas discharge tubes, particularly for decorative effect, is presented. Buttson et al. use a transistor oscillator of the Hartly type with the main frequency determining coil and the feedback coil being the primary winding of a step-up transformer.
Abstract: An electrical circuit for periodically and essentially randomly flashing a plurality of gas discharge tubes, particularly for decorative effect. A plurality of gas discharge tubes are connected with associated resistor and capacitor combinations in a relaxation oscillator configuration. A sufficiently high voltage to operate the parallel relaxation oscillators is derived from a low-voltage source and a DC to DC voltage step-up converter. The converter comprises a transistor oscillator of the Hartly type with the main frequency determining coil and the feedback coil being the primary winding of a step-up transformer. The oscillator is powered by the low-voltage DC source and the stepped-up AC voltage appearing at the secondary of the transformer is rectified and filtered to supply the sufficiently high voltage to operate the plurality of flashing circuits.

8 citations


Journal ArticleDOI
TL;DR: In this article, the first switch is connected to an inductor and a transformer primary winding, so that a first current component from a DC input supply flows through it via the inductor.
Abstract: A DC-DC converter includes first and second switches to be opened and closed at mutually exclusive times at a predetermined frequency. The first switch is connected to an inductor and a transformer primary winding so that a first current component from a DC input supply flows through it via the inductor. A second current component having a sinusoid component flows through the first switch in response to discharge of energy stored in a resonant circuit coupled to the transformer. The second component begins approximately simultaneously with closure of the first switch. The second switch, when closed, is connected so that a bidirectional current component flows through it in response to energy stored in the inductor. The rectifier is connected between the secondary winding and the load so the secondary winding supplies substantial current to the load.

5 citations


Patent
12 Mar 1970
TL;DR: In this paper, a system for converting a time-varying periodic, complex electrical input wave to DC with reduced response to selected harmonic distortion components of the wave, the system including a conventional AC-DC converter and means for selectively altering the gain of the converter between predetermined phase angles with respect to the fundamental wave.
Abstract: A system for converting a time-varying periodic, complex electrical input wave to DC with reduced response to selected harmonic distortion components of the wave, the system including a conventional AC-DC converter and means for selectively altering the gain of the converter between predetermined phase angles with respect to the fundamental of the wave. Gain alteration is typically effected by a second AC-DC converter having a different characteristic sensitivity to the distortion components than the first converter. The outputs of the two converters are scaled and then summed, the scaling factors being dependent on the harmonics the effect of which is intended to be reduced. One converter is an average-sensing device, the other being a peak-To-peak or peak-averaging sensing device.

4 citations


Patent
21 Dec 1970
TL;DR: In this paper, a self-oscillating DC to DC power converter establishes oscillations in the inverter through the voltage regulating feedback circuit, which is regulated by a frequency regulation feedback circuit.
Abstract: A self-oscillating DC to DC power converter establishes oscillations in the inverter through the voltage regulating feedback circuit. Its frequency of oscillation is regulated by a frequency regulation feedback circuit which controls the hysteresis response of the voltage regulating feedback circuit.

4 citations


Patent
18 Dec 1970
TL;DR: In this paper, it was shown that if there are two or more chains all chains are connected in parallel between earth and the transmission line in the DC network, then at least some of the apparatus connected to high potential, such as transformers, reactors and the like, have their tanks connected to the DC side of the converter chain at a point where the potential in relation to earth is at least half the voltage in DC network.
Abstract: In converter stations in DC networks for ultrahigh voltages there is at least one chain of converter bridges. The converter bridges in each chain are series connected on the DC side and connected over transformers to an alternating current network on the AC side. When there are two or more chains all chains are connected in parallel between earth and the transmission line in the DC network. At least some of the apparatus connected to high potential, such as transformers, reactors and the like, have their tanks connected to the DC side of the converter chain at a point where the potential in relation to earth is at least half the voltage in the DC network.

2 citations