公开(公告)号：US20190305671A1

公开(公告)日：2019-10-03

申请号：US16366376

申请日：2019-03-27

Applicant: TDK CORPORATION

Inventor： Ken MATSUURA ,  Min LIN

IPC: H02M1/42 ,  H02M7/217 ,  H02M1/08

Abstract: A zero current detection circuit includes: one detection winding that is magnetically coupled to a boost inductor of a bridgeless totem pole DEC for converting an AC input voltage to a DC output voltage, has one end connected to ground, and generates a zero current detection signal, which changes in proportion to a boost inductor voltage, at another end; a resistor with one end connected to the other end of the detection winding; a clamp composed of two diodes connected to each other in series with a same forward direction, which clamps the inputted zero current detection signal to the ground potential and a positive power supply voltage to convert to a rectangular signal; and a pulse outputter with a comparator which compares the rectangular signal and a comparison voltage and outputs detection pulses with falling edges that are synchronized with an inductor current reaching zero.

公开(公告)号：US20180375503A1

公开(公告)日：2018-12-27

申请号：US16016879

申请日：2018-06-25

Applicant: TDK CORPORATION

Inventor： Min LIN ,  Ken MATSUURA

IPC: H03K17/0412 ,  H03K17/0416 ,  H02M1/38

Abstract: A FET driving circuit includes: two inputs for inputting a DC voltage; two outputs respectively connected to gate and source electrodes of a FET; a switch; a resonant capacitance connected between both ends of the switch; and an LC resonance circuit connected between the inputs and both ends of the switch. When the two inputs are shorted, frequency characteristics of an impedance of the LC resonance circuit include, in order from a low to a high-frequency side, first to fourth resonant frequencies. The first resonant frequency is higher than a switching frequency of the switch, the second resonant frequency is around double the switching frequency, the fourth resonant frequency is around four times the switching frequency, and the impedance has local maxima at the first resonant frequency and the third resonant frequency and local minima at the second resonant frequency and the fourth resonant frequency.

公开(公告)号：US20180145608A1

公开(公告)日：2018-05-24

申请号：US15790354

申请日：2017-10-23

Applicant: TDK CORPORATION

Inventor： Min LIN ,  Ken MATSUURA ,  Hitoshi KINOSHITA

IPC: H02M7/523

CPC classification number: H02M7/523 ,  H02M7/4826 ,  H02M7/53 ,  H02M2007/4815 ,  Y02B70/1441

Abstract: A power conversion apparatus includes: DC input terminals for inputting a DC voltage; AC output terminals for outputting an AC voltage; a switching element; a first resonant capacitance connected across the switching element; a first LC resonance circuit that has an inductance and a capacitance connected in series and is connected together with the switching element between the AC output terminals; and a second LC resonance circuit connected in series together with the switching element between the DC input terminals. The second LC resonance circuit includes a first connector portion connected to one DC input terminal and a second connector portion connected to the switching element, and has a first current path, which includes an inductance, and a second current path, which includes a series circuit with an inductance and a capacitance, formed between the first connector portion and the second connector portion.

公开(公告)号：US20170063224A1

公开(公告)日：2017-03-02

申请号：US15061410

申请日：2016-03-04

Applicant: TDK CORPORATION

Inventor： Lin MIN ,  Ken MATSUURA

IPC: H02M3/156

CPC classification number: H02M3/156 ,  H02M2001/0025

Abstract: A control circuit controls a switching element in a switching power supply unit. The control circuit includes: a controller connected to the switching element; a signal generating circuit connected to the input part of the controller; a reference voltage source connected to the signal generating circuit; and a comparator having a first input terminal to which an output voltage is input from the switching power supply unit, a second input terminal to which a comparison signal is input from the signal generating circuit, and an output terminal connected to the signal generating circuit and to the input part of the controller.

Abstract translation: 控制电路控制开关电源单元中的开关元件。 控制电路包括：连接到开关元件的控制器; 连接到控制器的输入部分的信号发生电路; 连接到信号发生电路的参考电压源; 以及比较器，具有从开关电源单元输入输出电压的第一输入端子，从信号生成电路向其输入比较信号的第二输入端子，以及与信号生成电路连接的输出端子，以及 到控制器的输入部分。

公开(公告)号：US20160241145A1

公开(公告)日：2016-08-18

申请号：US15042965

申请日：2016-02-12

Applicant: TDK CORPORATION

Inventor： Ken MATSUURA ,  Min LIN

IPC: H02M3/156

CPC classification number: H02M3/156 ,  H02M1/14 ,  H02M3/1563 ,  H02M3/158 ,  H02M3/335 ,  H02M2001/0025 ,  H02M2001/0032 ,  H02M2001/0058 ,  Y02B70/1491 ,  Y02B70/16

Abstract: A control circuit according to an embodiment of the present invention is configured to control a switching element of a switching power supply. The control circuit includes a comparator having a first input terminal configured to receive an output voltage of the switching power supply. The comparator has a second input terminal that is connectable to a positive terminal of a reference voltage source. The comparator has an output. The output brings the reference voltage to a first voltage while the output signal takes a first voltage level. The output brings the reference voltage to a second voltage while the output signal takes a second voltage level. The constant voltage source has a positive terminal connected to a negative terminal of the reference voltage source and a ground of the comparator.

Abstract translation: 根据本发明的实施例的控制电路被配置为控制开关电源的开关元件。 控制电路包括比较器，其具有被配置为接收开关电源的输出电压的第一输入端。 比较器具有可连接到参考电压源的正极的第二输入端子。 比较器有一个输出。 当输出信号采取第一电压电平时，输出使参考电压达到第一电压。 当输出信号采取第二电压电平时，输出使参考电压达到第二电压。 恒定电压源具有连接到参考电压源的负极端子和比较器的接地的正极端子。

公开(公告)号：US20140036547A1

公开(公告)日：2014-02-06

申请号：US13956643

申请日：2013-08-01

Applicant: TDK Corporation

Inventor： Ken MATSUURA ,  Kazunori OSHIMA ,  Hiroshige YANAGI

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M3/3376 ,  H02M2001/0058 ,  Y02B70/1491

Abstract: A power supply device includes a control unit performing PFM control for a switching element, a voltage detection unit detecting an output voltage of a converter, and a signal generation circuit. The control unit calculates a first control command value based on the output voltage, calculates a new first control command value adjusting the output voltage to a target voltage, calculates a difference value therebetween, and outputs a voltage, which has a polarity corresponding to the difference value, for a first output period corresponding to the difference value. The signal generation circuit generates a pulse signal in which a frequency increases or decreases in accordance with a first command value voltage corresponding to a charged voltage at a storage element according to the new first control command value. The switching element is driven by the pulse signal that has a finer adjustment unit frequency.

Abstract translation: 电源装置包括对开关元件执行PFM控制的控制单元，检测转换器的输出电压的电压检测单元和信号生成电路。 控制单元基于输出电压计算第一控制指令值，计算将输出电压调整为目标电压的新的第一控制指令值，计算出其间的差值，并输出与差值相对应的极性的电压 值，对应于差值的第一输出周期。 根据新的第一控制指令值，信号发生电路根据对应于存储元件的充电电压的第一指令值电压产生频率增加或减小的脉冲信号。 开关元件由具有更精细的调整单位频率的脉冲信号驱动。

公开(公告)号：US20140009968A1

公开(公告)日：2014-01-09

申请号：US13933566

申请日：2013-07-02

Applicant: TDK CORPORATION

Inventor： Ken MATSUURA ,  Hiroshige YANAGI

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M3/33592 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1475 ,  Y02B70/1491

Abstract: A current resonance type DC-DC converter includes a transformer that has a primary winding and a secondary winding, a switching circuit that has a pair of first switching elements and that is connected to the primary winding, an AC/DC transfer circuit that has four rectifying devices, which are connected in full bridge and include a pair of second switching elements, that is connected to the secondary winding, that converts an AC voltage, which is induced at the secondary winding, into a DC voltage and that outputs the DC voltage, and a control circuit that controls ON and OFF operations of the pairs of the first and second switching elements. The control circuit controls the ON and OFF operations so as to synchronize the pair of the first switching elements with the pair of the second switching elements.

Abstract translation: 电流谐振型DC-DC转换器包括具有初级绕组和次级绕组的变压器，具有一对第一开关元件并连接到初级绕组的开关电路，具有四个 整流装置，其以全桥连接并且包括连接到次级绕组的一对第二开关元件，其将在次级绕组处感应的AC电压转换为DC电压并将DC电压输出 以及控制电路，其控制第一和第二开关元件对的接通和断开操作。 控制电路控制ON和OFF操作，以使该对第一开关元件与该对第二开关元件同步。