Showing papers on "Boost converter published in 1970"
Patent•
06 Apr 1970TL;DR: In this paper, a non-dispressive power loss suppression circuit for a transistor controlled DC power converter of the type having a pair of positive and negative input terminals for connection to a source of DC voltage, a power converter inductor having primary and secondary windings, one end of the primary windings being connected to the positive input terminal, a transistor having a base connected to a transistor drive circuit for control of the transistor with turn-on and turnoff pulses, a collector conducted to the other end of a power converter primary winding, and an emitter connected to
Abstract: A nondissipative power loss suppression circuit for a transistor controlled DC power converter of the type having a pair of positive and negative input terminals for connection to a source of DC voltage, a power converter inductor having primary and secondary windings, one end of the primary windings being connected to the positive input terminal, a transistor having a base connected to a transistor drive circuit for control of the transistor with turn-on and turnoff pulses, a collector conducted to the other end of the power converter inductor primary winding, and an emitter connected to the negative input terminal, and an output diode in series arrangement for providing a DC voltage output across the arrangement. The power loss suppression circuit consists of an energy absorbing circuit connected to the terminals and the power converter inductor for absorbing input voltage power during a turn-on pulse while said output diode recovers and for transferring excess absorbed power to the source when the diode recovers. Also provided is an energy storage circuit connected to the positive terminal and collector for storing power in the power converter inductor and the energy absorbing circuit during a turnoff pulse. An energy transfer circuit connected to the negative terminal and the energy storage circuit provides for the transfer of energy stored by the energy storage circuit to the source during a succeeding turn-on pulse.
27 citations
Patent•
11 Dec 1970
TL;DR: In this article, an organ stimulator is provided having a power supply, a pulse generating circuit, a voltage converter and output terminals, and a novel current limiting circuit is also provided which regulates the output pulse current of the pacer.
Abstract: An organ stimulator is provided having a power supply, a pulse generating circuit, a voltage converter and output terminals. The voltage converter includes at least one capacitor which is arranged such that, during the interpulse interval between pulses from the pulse generator, the capacitor charges to approximately the voltage of the power supply and upon application of a pulse to the voltage converter, the combined voltages of the power supply and the charged capacitor are supplied to the output terminals. A novel current limiting circuit is also provided which regulates the output pulse current of the pacer.
19 citations
Patent•
29 Sep 1970TL;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•
14 Dec 1970TL;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•
20 Nov 1970TL;DR: In this paper, a self-synchronized commutator that causes the power pass transistor in the converter to very rapidly assume its completely turned off state when converter power output is no longer desired is presented.
Abstract: A power converter having a self-synchronized commutator that causes the power pass transistor in the converter to very rapidly assume its completely turned off state when converter power output is no longer desired. Also provided is apparatus for the converter which supplies base drive to the power pass transistor in response to a triggering pulse. The base drive apparatus has a feed back transistor bias circuit which includes a starting gate that allows the converter to operate during the first several cycles until bias by the bias circuit is provided.
12 citations
Patent•
21 Dec 1970TL;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•
25 Mar 1970TL;DR: In this article, a regulable and controllable inverter or converter for feeding alternating current motors with a regulated current and frequency in which adjustment of the converter output voltage per phase is effected by the voltage output of a slip ring armatureasynchronous machine driven by the motor, means being provided to rotate the winding axis of the asynchronous machine relative to that of the motor.
Abstract: A regulable and controllable inverter or converter for feeding alternating current motors with a regulated current and frequency in which adjustment of the converter output voltage per phase is effected by the voltage output of a slip ring armatureasynchronous machine driven by the motor, means being provided to rotate the winding axis of the asynchronous machine relative to that of the motor.
8 citations
Patent•
25 Nov 1970
TL;DR: In this article, a phase lock oscillator is connected to a clock which controls the operation of the converter in such a manner that the integration time of the converter is equal to one or more cycles of the power line frequency.
Abstract: Multiplexed analog signals are applied to the input of a sampling amplifier having a digitally controlled gain. The signals at the output of the sampling amplifier are applied to an analog to digital integrating converter. A phase lock oscillator is connected to a clock which controls the operation of the converter in such a manner that the integration time of the converter is equal to one or more cycles of the power line frequency, whereby maximum common mode rejection occurs at the power line frequency.
8 citations
Patent•
23 Mar 1970
TL;DR: A two-way electronic frequency converter is operable in forward or reverse modes without switching as discussed by the authors, and it can be found in the literature in the form of a two-dimensional (2D) circuit.
Abstract: A two-way electronic frequency converter is operable in forward or reverse modes without switching.
4 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•
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.
Patent•
02 Jun 1970
TL;DR: In this paper, a highvoltage light-controlled semiconductor converter comprising semiconductor rectifying elements with light pickups, arranged all the way around a sphere, and a light-distributing system placed inside said sphere, for the best utilization of its luminous flux.
Abstract: A high-voltage light-controlled semiconductor converter comprising semiconductor rectifying elements with light pickups, arranged all the way around a sphere, and a light-distributing system placed inside said sphere, for the best utilization of its luminous flux. The converter is mainly intended for use on power transmission lines.
Patent•
15 May 1970
TL;DR: The linearity error compensation circuit for a meter converter includes a monostable multivibrator for receiving an output frequency signal from the meter converter which varies in response to a function being metered as discussed by the authors.
Abstract: The linearity error compensation circuit for a meter converter includes a monostable multivibrator for receiving an output frequency signal from the meter converter which varies in response to a function being metered. The multivibrator controls a switch which passes either a reference input to a function transformer or a level regulator which are connected between a voltage blocking circuit connected to the multivibrator output and a voltage-frequency converter. The output of the voltagefrequency converter is connected to an arithmetic unit which is also connected to the output of the meter converter.