公开(公告)号：US20060244428A1

公开(公告)日：2006-11-02

申请号：US10545567

申请日：2003-02-11

Applicant: Ionel Jitaru ,  George Casaru

Inventor： Ionel Jitaru ,  George Casaru

IPC: G05F1/00

CPC classification number: H02M1/34 ,  H02M3/155 ,  H02M2001/342 ,  H02M2001/344 ,  H03K17/04 ,  H03K17/0814 ,  H03K17/687 ,  H03K17/74 ,  Y02B70/1491

Abstract: An improved snubber is electrically switched to close a current path to a capacitor (C) in a series connected RC circuit at the onset of an abrupt voltage change otherwise producing ringing in a resonant circuit to which the snubber circuit is connected. The current path to the capacitor (C) is then interrupted before the capacitor (C) discharges and thereafter at each such voltage change in the resonant circuit the capacitor (C) is no longer charged from its totally discharged state but nevertheless damps the ringing by virtue of current flow to the nearly completely charged capacitor (C). By preventing complete charging and discharging of the capacitor (C) in the RC circuit every cycle, power dissipation in the resistance of the snubber circuit is greatly reduced.

Abstract translation: 改进的缓冲器电开关以在突发电压变化开始时闭合串联RC电路中的电容器（C）的电流路径，否则在缓冲电路连接到的谐振电路中产生振铃。 电容器（C）的电流路径然后在电容器（C）放电之前中断，此后在谐振电路中的每个这样的电压变化下，电容器（C）从其完全放电状态不再被充电，但是仍然通过 电流流过几乎完全充电的电容器（C）。 通过每个周期防止RC电路中的电容器（C）完全充放电，缓冲电路电阻的功耗大大降低。

公开(公告)号：US20060013022A1

公开(公告)日：2006-01-19

申请号：US10511232

申请日：2003-04-11

Applicant: Ionel Jitaru

Inventor： Ionel Jitaru

IPC: H02M3/335

CPC classification number: H02M1/38 ,  H02M1/32 ,  H02M3/33592 ,  H02M2001/0012 ,  H02M2001/0048 ,  Y02B70/1475 ,  Y02B70/1491

Abstract: A DC-DC flyback converter that has a controlled synchronous rectifier in its secondary circuit, which is connected to the secondary winding of a main transformer. A main switch (typically a MOSFET) in the primary circuit of the converter is controlled by a first control signal that switches ON and OFF current to the primary winding of the main transformer. To prevent cross-conduction of the main switch and the synchronous rectifier, the synchronous rectifier is turned ON in dependence upon a signal derived from a secondary winding of the main transformer and is turned OFF in dependence up a signal derived from the first control signal. In one embodiment the first control signal is inverted and delivered to a logic circuit along with the voltage across the main transformer secondary winding and the voltage across the synchronous rectifier. In a further embodiment the first control signal is differentiated and supplied to a control primary winding wound on the outer flux paths of a main transformer core that has a center flux path on which is wound the main transformer primary and secondary windings. A control secondary winding is wound on the outer flux paths in current canceling relation as to flux conducted from the center flux path into the outer flux paths. The control signal for the synchronous rectifier is taken from the output of the control secondary winding in this latter embodiment.

Abstract translation: DC-DC反激式转换器，其二次回路中具有受控同步整流器，其连接到主变压器的次级绕组。 转换器初级电路中的主开关（通常为MOSFET）由对主变压器的初级绕组导通和截止电流的第一控制信号控制。 为了防止主开关和同步整流器的交叉导通，根据从主变压器的次级绕组导出的信号，同步整流器被接通，并且依赖于从第一控制信号导出的信号而断开。 在一个实施例中，第一控制信号与主变压器次级绕组两端的电压以及同步整流器两端的电压一起被反转并输送到逻辑电路。 在另一个实施例中，第一控制信号被微分并且提供给缠绕在主变压器铁芯的外部磁通路径上的控制初级绕组，该主变压器磁芯具有卷绕在主变压器初级和次级绕组上的中心磁通路径。 控制次级绕组以电流抵消关系将外磁通路缠绕在从中心磁通通路传导到外磁通路径中的磁通上。 在后一个实施例中，来自控制次级绕组的输出获得用于同步整流器的控制信号。

公开(公告)号：US20060006975A1

公开(公告)日：2006-01-12

申请号：US10512128

申请日：2003-04-11

Applicant: Ionel Jitaru ,  Marco Davila

Inventor： Ionel Jitaru ,  Marco Davila

IPC: H01F27/24

CPC classification number: H01F27/2804 ,  H01F27/24 ,  Y10T29/4902

Abstract: A low profile magnetic element used in cooperation with a multilayer printed circuit board has two or more core arms penetrating the board from one outer surface to the other and a series of magnetic core elements, at least one on each side of the board, bridging pairs of the core arms to form a closed, unbranched flux path. Series-connected windings form a transformer primary and are wound on the core arms that penetrate the board. Parallel-connected windings form a transformer secondary and are also wound on the core arms. The series-connected windings and the parallel-connected windings may be buried windings printed on internal surfaces of the multilayer board. The connected in series primary windings all have the same number of turns and the parallel-connected secondary windings all have the same number of turns. The parallel secondary windings are connected in current additive fashion to afford a high current transformer output. Output treating circuitry can treat each output separately in parallel and identically, being connected between the winding outputs and their point of connection. The transformer core can be assembled entirely of C and I magnetic elements. In one embodiment, a pair of magnetic plates overlying the outer surfaces of the multilayer circuit board are in flux-conducting relation with all of the core arms penetrating the board.

Abstract translation: 与多层印刷电路板协作使用的低轮廓磁性元件具有从一个外表面到另一个外表面穿过该基板的两个或多个芯臂，以及一系列磁芯元件，该板的每一侧至少有一个桥接对 的芯臂以形成封闭的，无分支的通量路径。 串联绕组形成变压器初级，并缠绕在穿过电路板的芯臂上。 并联绕组形成变压器次级并且还缠绕在芯臂上。 串联绕组和并联绕组可以是埋在多层印刷板的内表面上的绕组。 串联连接的初级绕组全部具有相同的匝数，并联的次级绕组全部具有相同的匝数。 并联次级绕组以当前的添加方式连接以提供高电流互感器输出。 输出处理电路可以并联和相同地分别处理每个输出，连接在绕组输出和它们的连接点之间。 变压器铁芯可以完全由C和I磁性元件组装。 在一个实施例中，覆盖多层电路板的外表面的一对磁性板与所有芯臂穿透板具有磁通 - 导通关系。

公开(公告)号：US06414578B1

公开(公告)日：2002-07-02

申请号：US09740314

申请日：2000-12-18

Applicant: Ionel Jitaru

Inventor： Ionel Jitaru

IPC: H01F2728

CPC classification number: H04B5/00 ,  H04B5/0031 ,  H04B5/0037 ,  H04B5/0087

Abstract: A method and apparatus for transmitting a signal through a power magnetic structure. A power magnetic core has one or more windings for transmitting power, and two windings for transmitting a signal or auxiliary power. The signal or auxiliary power windings are looped around features of the core so as to cancel the effect of magnetic flux circulating in the core as a result of currents flowing through the one or more power windings.

Abstract translation: 一种通过功率磁结构发送信号的方法和装置。 功率磁芯具有用于发射功率的一个或多个绕组，以及用于发送信号或辅助电力的两个绕组。 信号或辅助功率绕组围绕芯的特征环绕，以便消除由于电流流过一个或多个功率绕组而在磁芯中循环的磁通的影响。

公开(公告)号：US5973923A

公开(公告)日：1999-10-26

申请号：US86365

申请日：1998-05-28

Applicant: Ionel Jitaru

Inventor： Ionel Jitaru

IPC: H01F27/06 ,  H05K1/02 ,  H05K1/05 ,  H05K1/16 ,  H05K7/20

CPC classification number: H05K1/165 ,  H01F27/06 ,  H05K1/0206 ,  H05K7/209 ,  H05K1/0203 ,  H05K1/05 ,  H05K2201/066 ,  H05K2201/086 ,  H05K2201/09054 ,  H05K2201/09063 ,  H05K2201/09572 ,  H05K2201/09745 ,  H05K2201/10166 ,  H05K3/0061 ,  Y10T29/49165

Abstract: A package for power converters in which a multilayers circuits board holds the components. The winding of the magnetic elements are incorporated in the multilayers circuit board. The top and some portion of the bottom layer are also support for electronic components. Some of the components are placed on the top layer, which may not be utilized for magnetic winding, reducing the footprint of the magnetic elements to the footprint of the magnetic core. The power dissipating devices placed on pads which have a multitude of copper coated via connecting the top to bottom layers. Through these via the heat is transferred from the power devices to the other side of the PCB. In some of the embodiment of this invention the heat can be further transferred to a metal plate connected to the multilayers circuit board via a thermally conductive insulator. The baseplate has cutouts or cavities to accommodate the magnetic cores. A thermally conductive is placed between the magnetic core and the metal plate on the bottom of the cavity.

Abstract translation: 用于电力转换器的封装，其中多层电路板保持部件。 磁性元件的绕组结合在多层电路板中。 底层的顶部和一部分也支持电子部件。 一些部件被放置在顶层上，其可能不用于磁性绕组，从而将磁性元件的占地面积减小到磁芯的占地面积。 功率耗散器件放置在焊盘上，通过连接顶层到底层，镀有多种铜。 通过这些通过热量从功率器件传递到PCB的另一侧。 在本发明的一些实施例中，可以通过导热绝缘体将热量进一步转移到连接到多层电路板的金属板上。 底板具有切口或空腔以容纳磁芯。 将导热材料放置在磁芯和空腔底部的金属板之间。

公开(公告)号：US5126931A

公开(公告)日：1992-06-30

申请号：US579470

申请日：1990-09-07

Applicant: Ionel Jitaru

Inventor： Ionel Jitaru

IPC: H02M3/335

CPC classification number: H02M3/33561 ,  H02M3/33569

Abstract: A single ended forward DC-to-DC converter is operated with a main switch in series circuit with a primary winding of the isolation transformer and an auxiliary switch for charging a reset capacitor also in circuit with said 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 into the secondary of the transformer. Current discharge into the secondary of the transformer during this time period is limited either by a saturable reactor in series circuit with the secondary or a selectively controlled rectifier.

公开(公告)号：US20220140742A1

公开(公告)日：2022-05-05

申请号：US17428943

申请日：2018-11-15

Applicant: Ionel Jitaru

Inventor： Ionel Jitaru

IPC: H02M3/335 ,  H02M3/158 ,  H02M1/00

Abstract: Power converter electronic circuitries configured to harvest and store energy from at least the parasitic oscillation occurring during the operation thereof. Methodologies of using such energy for the current injection, carried out by discharging the parasitic capacitance across the switching elements to achieve zero voltage switching condition for these switching elements. In a specific case, the methodology of current injection (with the use of so harvested and stored energy) is self-adjusting, causing the optimization of the energy required to discharge the parasitic capacitances.

公开(公告)号：US20190221362A1

公开(公告)日：2019-07-18

申请号：US16368186

申请日：2019-03-28

Applicant: Ionel Jitaru

Inventor： Ionel Jitaru

IPC: H01F27/40 ,  H01F27/28 ,  H01F27/29 ,  H01F19/04 ,  G11C11/06

CPC classification number: H01F27/40 ,  G11C11/06 ,  H01F19/04 ,  H01F27/2804 ,  H01F27/29 ,  H01F2027/408

Abstract: 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.

公开(公告)号：US20170214314A1

公开(公告)日：2017-07-27

申请号：US15284207

申请日：2016-10-03

Applicant: Ionel Jitaru ,  Marco Antonio Davila ,  Cosmin Andrei Tamas

Inventor： Ionel Jitaru ,  Marco Antonio Davila ,  Cosmin Andrei Tamas

IPC: H02M1/42 ,  H02M7/06

CPC classification number: H02M1/4208 ,  H02M1/4225 ,  Y02B70/126 ,  Y02B70/1483 ,  Y02P80/112

Abstract: Ideal switch bridgeless PFC topologies are presented with the purpose of increasing the efficiency in power factor correction circuits and inverter applications. The topology also leverages the new GaN switches that are available. This patent offers also a very good solution for the Zero crossing distortion problem improving greatly the THD both in power factor correction and inverter applications.

公开(公告)号：US20170012547A1

公开(公告)日：2017-01-12

申请号：US15068598

申请日：2016-03-13

Applicant: Ionel Jitaru

Inventor： Ionel Jitaru

IPC: H02M3/335

CPC classification number: H02M3/33592 ,  H02J3/00 ,  H02M3/3353 ,  H02M3/33576

Abstract: 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. The fourth technique is controlling the turn off timing of the primary switchers and turn on timing for the secondary synchronous rectifier and in this way to control the energy in the leakage inductance during the dead time in order to build enough energy in the leakage inductance to discharge the parasitic capacitances of the primary switchers to zero. In a given application we may use one or several of these technique function of the operating conditions.

Abstract translation: 显示了一种方法，通过在死区时间内保持漏电感能量并使用几种技术来补充放电一次切换器的寄生电容所需的能量并获得零电压切换，从而在选定拓扑中产生软转换。 一种技术包括在死区时间和同步整流器关断之前的同步整流器的电流脉冲注入。 第二种技术包括通过频率调制来调整磁化电流以增加漏电感的能量，并利用该能量来放电一次切换器的寄生电容，并且在较轻的负载下具有超过通过输出电感器的电流的磁化电流 在死亡时间结束时。 第三种技术是交错两个转换器并共享一对电感，以便在其最低振幅的磁化电流的电平下降低通过每个输出电感器的电流。 第四种技术是控制一次开关的关断定时，并启动次级同步整流器的定时，并以这种方式在死区时间内控制漏电感的能量，以便在漏电感中产生足够的能量来放电 主切换器的寄生电容为零。 在给定的应用中，我们可以使用这些技术功能中的一个或几个操作条件。