Patents Assigned to Rompower
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Patent number: 11165360Abstract: A method includes providing a transformer with primary and current injection windings, a primary switch connected to the primary winding, a parasitic capacitance reflected across the primary switch, a secondary rectifier means, and a current injection circuit including a current injection switch connected to the current injection winding, and a unidirectional current injection switch connected to the current injection winding. The method includes switching on the current injection switch to start a current injection flowing from a controlled voltage source, through the unidirectional current injection switch and further through the current injection winding. The current injection reflects into the primary winding, thereby discharging the parasitic capacitance reflected across the primary switch. The method includes turning on the primary switch with a delay time after the current injection switch turns on and turning off the current injection switch after the current injection reaches zero amplitude.Type: GrantFiled: January 24, 2020Date of Patent: November 2, 2021Assignee: Rompower Technology Holdings, LLCInventor: Ionel Jitaru
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Publication number: 20210234466Abstract: A half bridge switching cell includes two primary switching elements and a transformer with primary and secondary windings. Synchronized rectifiers correspond to the primary switching elements such that each of the synchronized rectifiers conducts when the corresponding primary switching element is not conducting. Each secondary winding is connected to one of the synchronous rectifiers and to a common connection and controlled current source. The primary switching elements conduct during offset times separated by a dead time. A magnetizing current flows through the secondary windings and synchronous rectifiers during the dead time. The magnetizing current flows into the primary winding when each of the synchronous rectifiers is turned off after the dead time, discharging a parasitic capacitance across the one of the primary switching elements when the corresponding synchronous rectifier is turned off, thereby creating a zero voltage switching condition at turn on for the primary switching elements.Type: ApplicationFiled: April 12, 2021Publication date: July 29, 2021Applicant: Rompower Technology Holdings LLCInventor: Ionel Jitaru
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Publication number: 20210226549Abstract: A DC-DC converter includes an input voltage source in series with a parasitic capacitance. The voltage changes and causes resonant ringing, wherein the input voltage source is connected to a rectifier means which is connected to an output circuit. A passive clamp circuit across the rectifier means includes a clamp diode, a clamp capacitor, and an auxiliary circuit. The auxiliary circuit includes first and second rectifiers in series with an electronic component having first and second terminals. The first rectifier has an anode connected with the passive clamp circuit, and a cathode connected to the second terminal of the electronic component. The second rectifier has a cathode connected with the anode of the first rectifier, and an anode connected with the first terminal of the electronic component. Some of the leakage inductance transfers to an auxiliary energy storage and damps the resonant ringing.Type: ApplicationFiled: April 5, 2021Publication date: July 22, 2021Applicant: Rompower Technology Holdings, LLCInventor: Ionel Jitaru
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Publication number: 20210217555Abstract: A magnetic and electrical circuit element including magnetic-flux-conducting posts, and a multi-layer structure formed with an electrically-conductive material. The multi-layer structure includes multiple layers forming a stack of layers along a length of the posts, said multi-layer structure configured as primary and secondary windings of a transformer. The primary winding is embedded in the multi-layer structure and wound around the magnetic-flux-conducting posts in such a way that a magnetic field induced in each of the magnetic-flux-conducting posts has a magnetic field polarity opposite to a polarity of the respective magnetic field of the magnetic-flux-conducting post adjacent the respective magnetic-flux-conducting post. Around each of the magnetic-flux-conducting posts, there is a respective one of the secondary windings connected to a semiconductor device.Type: ApplicationFiled: March 1, 2021Publication date: July 15, 2021Applicant: Rompower Technology Holdings, LLCInventor: Ionel Jitaru
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Patent number: 10937590Abstract: A magnetic configuration utilizing a plurality of posts and spiting the primary winding on each of the posts defining a core and placing the secondary windings together with the rectifier means around each post to minimise the stray and leakage inductance. A significant reduction of the core material and a reduction of the footprint is achieved due to better utilization of the winding material. The magnetic field is weaving from and through one post to the other to minimize the vertical component of ther field and forcing the magnetic field to be parallel with the winding to reduce the AC losses in copper of the winding. These properties allow the magnetic structure to be suitable in very high frequency applications and even in application with an air core. These magnetic structures can be used for implementing a transformer and for inductive applications.Type: GrantFiled: March 28, 2019Date of Patent: March 2, 2021Assignee: Rompower Technology Holdings, LLCInventor: Ionel Jitaru
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Publication number: 20210021200Abstract: A half bridge switching cell includes two primary switching elements and a transformer with primary and secondary windings. Synchronized rectifiers correspond to the primary switching elements such that each of the synchronized rectifiers conducts when the corresponding primary switching element is not conducting. Each secondary winding is connected to one of the synchronous rectifiers and to a common connection and controlled current source. The primary switching elements conduct during offset times separated by a dead time. A magnetizing current flows through the secondary windings and synchronous rectifiers during the dead time. The magnetizing current flows into the primary winding when each of the synchronous rectifiers is turned off after the dead time, discharging a parasitic capacitance across the one of the primary switching elements when the corresponding synchronous rectifier is turned off, thereby creating a zero voltage switching condition at turn on for the primary switching elements.Type: ApplicationFiled: August 10, 2020Publication date: January 21, 2021Applicant: Rompower Technology Holdings LLCInventor: Ionel Jitaru
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Publication number: 20210006170Abstract: A method includes providing a transformer with primary and current injection windings, a primary switch connected to the primary winding, a parasitic capacitance reflected across the primary switch, a secondary rectifier means, and a current injection circuit including a current injection switch connected to the current injection winding, and a unidirectional current injection switch connected to the current injection winding. The method includes switching on the current injection switch to start a current injection flowing from a controlled voltage source, through the unidirectional current injection switch and further through the current injection winding. The current injection reflects into the primary winding, thereby discharging the parasitic capacitance reflected across the primary switch. The method includes turning on the primary switch with a delay time after the current injection switch turns on and turning off the current injection switch after the current injection reaches zero amplitude.Type: ApplicationFiled: January 24, 2020Publication date: January 7, 2021Applicant: Rompower Technology Holdings, LLCInventor: Ionel Jitaru
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Publication number: 20200211762Abstract: A system for reducing common-mode noise includes a switch mode power supply having primary and secondary sides, primary and secondary side grounds, an input voltage source, a primary switch, a transformer, a core, and a power output. The primary and secondary sides each have a quiet termination. The transformer includes a primary winding, a secondary winding, and an active shield winding between the primary and secondary windings. The active shield winding has two terminations, is wound in a same direction as the secondary winding, and occupies a same axial position on the core as the secondary winding. One of the terminations of the active shield winding is connected to the quiet termination of the primary side, so that the terminations of the secondary winding and the active shield winding that are adjacent each other carry alternating voltages of a same polarity and a same amplitude.Type: ApplicationFiled: December 31, 2019Publication date: July 2, 2020Applicant: Rompower Technology Holdings, LLCInventors: Ionel Jitaru, Mihai Bogdan Jitariu, Andrei Stefan Savu
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Publication number: 20200169180Abstract: A circuit having primary and secondary sides includes a flyback converter having an input voltage source and a transformer with primary and secondary windings. A main switch is in series with the primary winding. A passive clamp circuit includes a clamp diode, a clamp capacitor, and an auxiliary circuit including first and second rectifiers in series with each other and with an electronic component configured to store electromagnetic energy. The electronic component has first and second terminals. A cathode of the first rectifier is connected with the passive clamp circuit, and an anode of the first rectifier is connected to the second terminal of electronic component. An anode of the second rectifier is connected with the cathode of the first rectifier, and a cathode of the second rectifier is connected with the first terminal of the electronic component.Type: ApplicationFiled: January 29, 2020Publication date: May 28, 2020Applicant: Rompower Technology Holdings, LLCInventor: Ionel Jitaru
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Patent number: 10651748Abstract: Electronic circuitry and method of operating the same to shape and reduce the circulating current through the active clamp in a flyback converter and to harvest most of the leakage inductance energy to provide the bias power. Methodologies for minimizing the circulating energy in the clamp circuit in order to improve efficiency of operation of the same. A method for using a portion of the leakage inductance energy in order to create zero voltage switching conditions at the main primary switch.Type: GrantFiled: October 11, 2018Date of Patent: May 12, 2020Assignee: Rompower Technology Holdings, LLCInventor: Ionel Jitaru
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Patent number: 10574148Abstract: A method includes providing primary, secondary, and current injection windings. There is a controlled voltage source, an input voltage source, a primary switch connected to the primary winding, a parasitic capacitance reflected across the primary switch, a secondary rectifier means, and a current injection circuit including a current injection switch connected to the current injection winding, and a unidirectional current injection switch connected to the current injection winding. The method includes switching on the current injection switch to start current injection flowing from the controlled voltage source, through the unidirectional current injection switch and the current injection winding.Type: GrantFiled: July 3, 2019Date of Patent: February 25, 2020Assignee: Rompower Technology Holdings, LLCInventor: Lonel Jitaru
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Publication number: 20170012547Abstract: A method is shown to create soft transition in selected topologies by preserving the leakage inductance energy during the dead time and using several techniques to supplement the energy require to discharge the parasitic capacitance of the primary switchers and obtain zero voltage switching. One technique consists in a current pulse injection across the synchronous rectifiers during the dead time and prior the turn off of the synchronous rectifiers. A second technique consist in tailoring the magnetizing current through frequency modulation to increase the energy in the leakage inductance and use that energy to discharge the parasitic capacitance of the primary switchers and at lighter load to have a magnetizing current which exceeds the current through the output inductor at the end of the dead time. The third technique is interleaving two converters and sharing a couple inductance in a way to lower the current through each output inductor under the level of the magnetizing current at its lowest amplitude.Type: ApplicationFiled: March 13, 2016Publication date: January 12, 2017Applicant: Rompower Energy Systems, Inc.Inventor: Ionel Jitaru
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Publication number: 20160359426Abstract: Meeting todays requirement in power supply technology demands significant technological advancement in optimizing circuit topology, components and materials, thermal and packaging designs. These requirements are being pushed mainly by continuously increasing power density and efficiency requirements. Ultimately, these trends will come to a point whereby limitations from the above mentioned technological advancements is dependent on one of the above, which is the packaging design. To realize this dependence, we need to look at the growing power systems for modern equipment out there. Let us enumerate some of the available AC adapters in terms of power densities of a 45 W adapter. Firstly, square type architecture introduced by Apple is about 7 W/in3, considering the packaging has a profile limitation whereby its AC plug is removable thus occupying relatively bigger chunk of the volume.Type: ApplicationFiled: December 11, 2014Publication date: December 8, 2016Applicant: Rompower Energy Systems, Inc.Inventors: Ionel Jitaru, Ian Poynton, Enrique Velasco
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Patent number: 6211767Abstract: A Low-to-High-Power, high reliability, high efficiency, small size transformer for power supply/DC—DC converter applications, using an inner layer winding constructed in a multilayers PCB and perfectly insulated with respect to the secondary, each layer having one ore more loops, interconnected to other layer by vias and contacted with simple pads, or any other contact type, including special connectors inserted in the PCB. The secondary is a special cooper strip designed as one or more one-turn strip, with pins designed for mechanical attachment and electrical contact. All the secondary strips on one side of the PCB, are perfectly symmetrical to the ones on the other side, so that they are interchangeable, and can be mounted on either side of the PCB. The secondary may be contacted directly to the strips, or with any other type of power connector inserted in the PCB.Type: GrantFiled: May 21, 1999Date of Patent: April 3, 2001Assignee: Rompower Inc.Inventor: Ionel Jitaru
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Patent number: 6046918Abstract: A transformer group in which a multitude of transformers are used to supply energy to a single load. The transformers are connected in series; in order to assist in providing a "flux equalizing" affect, the invention includes a flux equalizer circuit. The flux equalizer circuit provides a series of flux windings. Each flux winding is associated with a single transformer. The windings are arranged in parallel. In this manner, a balancing of the output of the transformers is obtained; the power output from each transformer is "sensed" by its associated flux winding which is "shared" with the other transformers via their own associated flux winding. Power is process then through the secondary windings, rectifiers, and output filters to a common load.Type: GrantFiled: May 12, 1999Date of Patent: April 4, 2000Assignee: Rompower Inc.Inventor: Ionel Jitaru
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Patent number: 5434768Abstract: A converter is operated with a main switch in series circuit with primary winding of the isolation transformer and an auxiliary switch for charging a reset capacitor also in circuit with the primary winding. The main switch and auxiliary switch are operated through control logic so that neither switch is ON at the same time. A predetermined dead time is provided between turning OFF the auxiliary switch and turning ON the main switch to allow the output capacitance of the main switch to discharge to zero. The power is transferred to the output during the ON and OFF time of the main switch. The power can be transferred to the output also during only the off time. In the case when the power is transferred from the primary to the secondary during both ON and OFF time, an inductor or a saturable reactor is series circuit with the secondary or a selectively controlled rectifier is used.Type: GrantFiled: February 12, 1993Date of Patent: July 18, 1995Assignee: RompowerInventors: Ionel Jitaru, Beldianu Vasile