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公开(公告)号：US10298135B1
公开(公告)日：2019-05-21
申请号：US15928144
申请日：2018-03-22
发明人： Mi Yong Kim , Masaaki Shimada , Eun Suk Lee , Tetsuya Tabata , Hiroaki Nakamura
摘要： A device and method for controlling a power supply. The method includes: monitoring a feedback signal of a feedback terminal; determining whether the feedback signal of the feedback terminal is not a pulse signal; and terminating an on/off operation of a switching element when the feedback signal of the feedback terminal is not a pulse signal. Therefore, an abnormal status of the device can be correctly detected with a simple structure when the feedback terminal is open or is shorted with other terminals, while an error operation and a damage of the device can be avoided.
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2.发明授权公开(公告)号：US12126267B2
公开(公告)日：2024-10-22
申请号：US17715081
申请日：2022-04-07
发明人： Eunsuk Lee , Jungyul Kim , Masaaki Shimada , Shinji Aso , Mitsutomo Yoshinaga , Hanju Kang
CPC分类号： H02M3/33592 , H02M1/0012 , H02M3/33571
摘要： A detector compares a drain voltage with a first threshold voltage and outputs a first detection signal. An ON counter detects a period of time during which a current flows in a switching, counts the period of time based on a predetermined clock cycle. An OFF counter detects a period of time during which a current flow through the body diode in a state where no current flows in the switching circuit, counts the period of time. An off-time setting circuit sets the time to turn off the switching circuit. A first comparison circuit compares the cycle count value with turn off time. A second comparison circuit compares a cycle count value output by the ON counter with a comparison result output by the first comparison circuit and outputs a signal to stop transmitting a PWM signal.
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3.发明授权公开(公告)号：US10396670B1
公开(公告)日：2019-08-27
申请号：US15928164
申请日：2018-03-22
发明人： Jung Eun Oh , Mi Yong Kim , Eun Suk Lee , Masaaki Shimada , Tetsuya Tabata , Hiroaki Nakamura
摘要： A device and method for controlling a power supply. The method includes: a first correction signal is generated according to a down-slope waveform and a second correction signal is generated according to an up-slope waveform, in a period of the switching element. Therefore, two kinds of corrections can be performed by using an oscillator, while the area of the circuit can be reduced and the cost of the integrated circuit can be decreased.
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公开(公告)号：US09490715B2
公开(公告)日：2016-11-08
申请号：US14828701
申请日：2015-08-18
发明人： Akira Hayakawa , Masaaki Shimada
CPC分类号： H02M3/33523 , H02M3/335 , H02M2001/0032 , H02M2001/0054 , Y02B70/1491 , Y02B70/16
摘要： A transformer comprises a primary winding to which a DC voltage is applied and a secondary winding. A switching circuit is connected to the primary winding. A rectifying-smoothening circuit rectifies and smoothens a pulse voltage generated at the secondary winding, by switching the switching element. An output unit outputs an output voltage obtained by the rectifying-smoothening circuit to a load. An error amplifier outputs an error voltage between the output voltage and a reference voltage to a primary side as a feedback signal. an oscillator lowers a switching frequency of the switching element in accordance with the feedback signal during a light load state. A frequency correction circuit corrects the switching frequency by the oscillator by changing a frequency correction rate in accordance with a value of the feedback signal along an approximate line along which the transformer is not saturated.
摘要翻译： 变压器包括施加有直流电压的初级绕组和次级绕组。 开关电路连接到初级绕组。 整流平滑电路通过切换开关元件对次级绕组产生的脉冲电压进行整流和平滑处理。 输出单元将由整流平滑电路获得的输出电压输出到负载。 误差放大器将输出电压和参考电压之间的误差电压输出到初级侧作为反馈信号。 振荡器在轻负载状态期间根据反馈信号降低开关元件的开关频率。 频率校正电路通过根据变压器不饱和的近似线路的反馈信号的值改变频率校正速率来校正振荡器的开关频率。
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公开(公告)号：US09455639B2
公开(公告)日：2016-09-27
申请号：US14739264
申请日：2015-06-15
发明人： Akira Hayakawa , Masaaki Shimada
CPC分类号： H02M3/33507 , H02M1/44 , H02M2001/0029 , H02M2001/0032 , H03K17/164 , Y02B70/16
摘要： A switched-mode power supply device is disclosed including an AC power supply, a transformer including a primary winding and a secondary winding, a switching element electrically connected to the primary winding, a secondary-side rectifying and smoothing circuit that generates an output voltage by rectifying and smoothing the pulse voltage, a load ratio detection circuit that detects if a load ratio is not greater than a load ratio threshold value during steady load, and outputs a drive switch signal based on the detection, and a drive circuit that, on the basis of the drive switch signal, causes the switching element to perform switching operation in one of a normal drive in which a speed of charging a gate voltage is faster and a soft drive in which the speed of charging the gate voltage is slower.
摘要翻译： 公开了一种开关式电源装置，其包括AC电源，包括初级绕组和次级绕组的变压器，与初级绕组电连接的开关元件，通过以下方式产生输出电压的次级侧整流和平滑电路： 整流和平滑脉冲电压，负载比检测电路，其在稳定负载期间检测负载比是否不大于负载比阈值，并且基于该检测输出驱动开关信号;以及驱动电路， 驱动开关信号的基础，使得开关元件在栅极电压充电速度更快的正常驱动中的栅极电压的充电速度较慢的软驱动中进行开关动作。
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公开(公告)号：US09318961B2
公开(公告)日：2016-04-19
申请号：US14284897
申请日：2014-05-22
CPC分类号： H02M3/33507 , H02M3/33523 , H02M2001/0025 , H02M2001/0035 , Y02B70/16
摘要： A switching power-supply device includes a COMP-voltage comparator circuit that compares a COMP-voltage obtained by performing phase compensation on the feedback signal, with a first threshold voltage which is a threshold value; and an intermittent-oscillation control circuit that, if it is detected by the COMP-voltage comparator circuit that the COMP-voltage is lower than the first threshold voltage, stops the switching operation of the switching device and performs a transition to a first intermittent oscillation operation in which the switching device performs the switching operation every predetermined first period, wherein if a predetermined delay period elapses in a state where the COMP-voltage is lower than the first threshold voltage, the intermittent-oscillation control circuit performs a transition to a second intermittent oscillation operation in which the switching device performs the switching operation every second period which is an integral multiple of the first period.
摘要翻译： 开关电源装置包括COMP电压比较器电路，其将通过对反馈信号执行相位补偿而获得的COMP电压与作为阈值的第一阈值电压进行比较; 以及间歇振荡控制电路，如果由COMP电压比较器电路检测到COMP电压低于第一阈值电压，则停止开关器件的开关动作并进行向第一间歇振荡的转换 其中开关装置每隔预定的第一周期执行切换操作的操作，其中如果在COMP电压低于第一阈值电压的状态下经过预定的延迟时间，则间歇振荡控制电路执行向第二 间歇振荡操作，其中开关装置每第二周期执行开关操作，该第二周期是第一周期的整数倍。
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公开(公告)号：US09564813B2
公开(公告)日：2017-02-07
申请号：US14576386
申请日：2014-12-19
发明人： Akira Hayakawa , Masaaki Shimada
CPC分类号： H02M3/33515 , H02M3/33507 , H02M2001/0032 , Y02B70/16
摘要： Disclosed is a switching power-supply device that induces a pulse voltage in a secondary winding of the transformer, and outputs, to a load, an output voltage rectified and smoothened by a secondary-side rectification smoothing circuit including a rectifier diode and a smoothing capacitor. An input-voltage detection circuit detects the input voltage of the alternating-current power supply. An error amplifier compares the output voltage with a reference voltage, and transmits a resultant error voltage to a primary side as a feedback signal. An internal oscillation circuit selects any of frequency decrease settings according to the input voltage detected by the input-voltage detection circuit, and performs, by using the selected frequency decrease setting, a frequency decreasing function of decreasing a switching frequency of the switching element at a light load, in response to the feedback signal transmitted from a secondary side to inform a state of the load.
摘要翻译： 公开了一种开关电源装置，其在变压器的次级绕组中产生脉冲电压，并且通过包括整流二极管和平滑电容器的次级侧整流平滑电路对负载输出整流并平滑的输出电压 。 输入电压检测电路检测交流电源的输入电压。 误差放大器将输出电压与参考电压进行比较，并将合成的误差电压发送到初级侧作为反馈信号。 内部振荡电路根据由输入电压检测电路检测的输入电压来选择任何频率降低设定，并且通过使用选择的频率降低设置来执行降低开关元件的开关频率的频率降低功能 响应于从次级侧发送的反馈信号来通知负载状态的轻负载。
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公开(公告)号：US20160087519A1
公开(公告)日：2016-03-24
申请号：US14491005
申请日：2014-09-19
CPC分类号： H02M3/33507 , H02M1/32 , H02M1/36 , H02M3/33523 , H02M2001/0006 , H02M2001/0035 , Y02B70/16
摘要： A switching power-supply device performs a control of an output voltage by switching operation of a switching element and has an integrated circuit including the switching element and a driving circuit for performing on-and-off control of the switching element. The integrated circuit includes an input terminal connected to the switching element, a voltage detection circuit, which detects a voltage of the input terminal, a timing control circuit, which controls a timing of detecting the voltage by the voltage detection circuit, and a control unit, which performs a control according to the voltage detected by the voltage detection circuit.
摘要翻译： 开关电源装置通过开关元件的开关动作来进行输出电压的控制，并且具有包括开关元件的集成电路和用于进行开关元件的导通和关断控制的驱动电路。 集成电路包括连接到开关元件的输入端子，检测输入端子的电压的电压检测电路，控制由电压检测电路检测电压的定时的定时控制电路，以及控制单元 ，其根据由电压检测电路检测的电压进行控制。
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公开(公告)号：US20150249380A1
公开(公告)日：2015-09-03
申请号：US14631491
申请日：2015-02-25
发明人： Akira Hayakawa , Masaaki Shimada , Yoichi Terasawa
CPC分类号： H02M3/33523 , H02M1/36 , H02M2001/0029 , H02M2001/0051 , Y02B70/1491
摘要： A switching power-supply device, in which an input power is applied to a primary winding of a transformer, a pulse voltage is induced in a secondary winding of the transformer by turning on and off a switching element connected to the primary winding of the transformer and an output voltage rectified and smoothed by a secondary-side rectifying-and-smoothing circuit having a rectifier diode and a smoothing capacitor is outputted, the switching power-supply device includes: a transient state detection circuit, which detects a transient state and outputs a soft-drive instruction signal; and a drive circuit which turns on-and-off the switching element in a soft-drive operation, in which a charging speed of a gate voltage at a time of passing a gate threshold voltage is delayed as compared to a normal operation, in a case where the soft-drive instruction signal is inputted.
摘要翻译： 一种开关电源装置，其中向变压器的初级绕组施加输入功率，通过接通和断开连接到变压器的初级绕组的开关元件，在变压器的次级绕组中感应出脉冲电压 输出由具有整流二极管和平滑电容器的次级侧整流平滑电路整流并平滑的输出电压，开关电源装置包括：瞬态状态检测电路，其检测瞬态状态并输出 软驱指令信号; 以及驱动电路，其在软驱动操作中导通和断开开关元件，其中与正常操作相比，延迟门极阈值电压时的栅极电压的充电速度被延迟 输入软驱动指示信号的情况。
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公开(公告)号：US09748850B2
公开(公告)日：2017-08-29
申请号：US14972084
申请日：2015-12-17
发明人： Akira Hayakawa , Masaaki Shimada
CPC分类号： H02M3/33523 , H02M1/10 , H02M7/04 , H02M2001/007
摘要： A switching power-supply device applies a DC voltage to a primary winding of a transformer and performs a switching operation of a switching element connected to a primary winding to generate and output an output voltage to a load. The switching power-supply device includes: an error amplifier, which compares the output voltage with a reference voltage and sends an error voltage as a feedback signal to a primary side; a frequency generation circuit, which generates a switching frequency according to the feedback signal; an off timing determination circuit, which determines a timing at which the switching element is turned off, by comparing a signal depending on the feedback signal with a current flowing through the switching element; and a frequency correction circuit, which corrects the switching frequency generated by the frequency generation circuit, according to an on-duty of the switching element.
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