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公开(公告)号：US07876076B2
公开(公告)日：2011-01-25
申请号：US11785958
申请日：2007-04-23
申请人： Morihito Hasegawa
发明人： Morihito Hasegawa
IPC分类号： G05F1/59
CPC分类号： H02M1/38 , H02M3/1588 , H03K2017/307 , Y02B70/1466
摘要： A DC-DC converter for preventing through current from causing erroneous operation of an ideal diode. A first transistor for receiving input voltage is connected to an ideal diode, which includes a second transistor and a comparator for detecting current flowing through the second transistor and generating a detection signal. A control circuit generates a switching signal for turning the first transistor on and off so as to keep the output voltage constant. A pulse generation circuit generates a pulse signal for turning off the second transistor before the first transistor is turned on and keeping the second transistor turned off for a predetermined period from when the first transistor is turned on. An erroneous operation prevention circuit generates a control signal for keeping the second transistor turned off from when the second transistor is turned off to when the first transistor is turned on.
摘要翻译： 一种用于防止通过电流引起理想二极管的错误操作的DC-DC转换器。 用于接收输入电压的第一晶体管连接到理想二极管，其包括第二晶体管和比较器，用于检测流过第二晶体管的电流并产生检测信号。 控制电路产生用于使第一晶体管导通和截止的开关信号，以保持输出电压恒定。 脉冲发生电路在第一晶体管导通之前产生用于截止第二晶体管的脉冲信号，并且在第一晶体管导通时保持第二晶体管截止预定时间段。 错误操作防止电路产生用于在第二晶体管截止时至第一晶体管导通时保持第二晶体管截止的控制信号。
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42.发明授权Control circuit for synchronous rectifier-type DC-DC converter, synchronous rectifier-type DC-DC converter and control method thereof 有权同步整流型DC-DC转换器的控制电路，同步整流型DC-DC转换器及其控制方法公开(公告)号：US07843179B2
公开(公告)日：2010-11-30
申请号：US11937818
申请日：2007-11-09
IPC分类号： G05F1/59
CPC分类号： H02M3/1588 , Y02B70/1466
摘要： To provide a control circuit for a synchronous rectifier-type DC-DC converter, a synchronous rectifier-type DC-DC converter and a control method thereof in which, in a light load state and a no-load state, an output voltage can be dropped to thus prevent an overshoot state from continuing. A synchronous rectifier-type DC-DC converter 10 and a control circuit 20A thereof comprising a first switching element FET1 that is made conductive when power is accumulated in an induction element L1, and a second switching element FET2 that is made conductive when power accumulated in induction element L1 is supplied to a load, also comprises a detecting unit COMP2 that detects that a value of an output voltage VOUT of the synchronous rectifier-type DC-DC converter 10A is a predetermined voltage value that is higher than a target voltage value, and control units COMP1 and OR1 that maintain the second switching element FET2 in a conductive state after discharge of the power accumulated in the induction element L1 is finished, based on the detection results of the detecting unit COMP2.
摘要翻译： 为了提供同步整流型DC-DC转换器的控制电路，同步整流型DC-DC转换器及其控制方法，其中在轻负载状态和空载状态下，输出电压可以是 从而防止过冲状态继续。 同步整流器型DC-DC转换器10及其控制电路20A包括当在感应元件L1中蓄电时导通的第一开关元件FET1和当电力累积在第二开关元件FET2中时导通的第二开关元件FET2 感应元件L1被提供给负载，还包括检测单元COMP2，其检测同步整流型DC-DC转换器10A的输出电压VOUT的值是比目标电压值高的预定电压值， 并且基于检测单元COMP2的检测结果，完成了在感应元件L1中累积的功率放电之后将第二开关元件FET2保持在导通状态的控制单元COMP1和OR1。
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43.发明授权公开(公告)号：US07821236B2
公开(公告)日：2010-10-26
申请号：US11937822
申请日：2007-11-09
CPC分类号： H02M3/1588 , H02M2001/0032 , Y02B70/1466 , Y02B70/16
摘要： A DC-DC converter reducing reverse current and maintaining high conversion efficiency under a light load. The DC-DC converter perform pulse width modulation (PWM) or pulse frequency modulation (PFM) and includes a drive control circuit generating a first drive signal and a second drive signal activating and inactivating a first transistor and a second transistor in a complementary manner. A reversed flow detection circuit detects current flowing to the second transistor and generates a detection signal controlling activation and inactivation of the second transistor. A detection signal invalidation circuit, coupled to the reversed flow detection circuit and the drive control circuit, receiving an operation switch signal and invalidating the detection signal in response to the operation switch signal during at least a certain period of the PWM.
摘要翻译： DC-DC转换器减轻反向电流并在轻负载下保持较高的转换效率。 DC-DC转换器执行脉冲宽度调制（PWM）或脉冲频率调制（PFM），并且包括产生第一驱动信号的驱动控制电路和以互补方式激活和去激活第一晶体管和第二晶体管的第二驱动信号。 逆流检测电路检测流向第二晶体管的电流，并产生控制第二晶体管的激活和失活的检测信号。 一个检测信号无效电路，耦合到反向流量检测电路和驱动控制电路，在PWM的至少一定周期期间响应于操作开关信号接收操作开关信号和使检测信号无效。
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44.发明授权Control circuit of current mode DC-DC converter and control method of current mode DC-DC converter 有权电流模式DC-DC转换器的控制电路和电流模式DC-DC转换器的控制方法公开(公告)号：US07733074B2
公开(公告)日：2010-06-08
申请号：US11936933
申请日：2007-11-08
CPC分类号： H02M3/156 , H02M2001/0009
摘要： To provide a control circuit of a current mode DC-DC converter, a current mode DC-DC converter and a control method thereof having excellent high-speed responsiveness with respect to fluctuations in output voltage. The control circuit of the current mode DC-DC converter serves as a DC-DC converter 1 that controls a peak value of a coil current and comprises a window comparator that detects whether an output voltage VOUT is within a predetermined voltage range including a target voltage, and a peak current setting unit that sets a peak current setting value of a coil current to a lower limit value or an upper limit value in response to a high or low voltage level of the output voltage VOUT, in the case that the output voltage VOUT is not within the predetermined voltage range including the target voltage.
摘要翻译： 提供电流模式DC-DC转换器的控制电路，电流模式DC-DC转换器及其控制方法，其具有相对于输出电压波动的优异的高速响应性。 电流模式DC-DC转换器的控制电路充当DC-DC转换器1，其控制线圈电流的峰值，并且包括窗口比较器，其检测输出电压VOUT是否在包括目标电压的预定电压范围内 以及峰值电流设定单元，其在输出电压的情况下，将线圈电流的峰值电流设定值设定为响应于输出电压VOUT的高或低电压电平的下限值或上限值 VOUT不在包括目标电压的预定电压范围内。
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公开(公告)号：US20080238395A1
公开(公告)日：2008-10-02
申请号：US12057001
申请日：2008-03-27
申请人： Morihito Hasegawa
发明人： Morihito Hasegawa
IPC分类号： G05F1/00
CPC分类号： H02M1/36 , H02M3/156 , Y10S323/901
摘要： According to an embodiment, a DC-DC converter comprises: an error amplifier that receives a soft start signal and amplifies a difference between an output voltage signal and a reference voltage signal; a PWM control circuit that controls ON and OFF states of a first switching transistor and a second switching transistor based on the output of the error amplifier; a frequency divider that divides a frequency signal and outputting a divided frequency signal; an accumulator that performs an adding operation based on the divided frequency signal and a control signal; and a DA converter that generates the soft start signal based on an output of the accumulator.
摘要翻译： 根据实施例，DC-DC转换器包括：误差放大器，其接收软启动信号并放大输出电压信号和参考电压信号之间的差; PWM控制电路，其基于误差放大器的输出来控制第一开关晶体管和第二开关晶体管的导通和截止状态; 分频器，分频频率信号并输出分频信号; 累加器，其基于所述分频信号和控制信号执行相加操作; 以及基于累加器的输出生成软启动信号的DA转换器。
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公开(公告)号：US20080136383A1
公开(公告)日：2008-06-12
申请号：US11937822
申请日：2007-11-09
IPC分类号： G05F1/08
CPC分类号： H02M3/1588 , H02M2001/0032 , Y02B70/1466 , Y02B70/16
摘要： A DC-DC converter reducing reverse current and maintaining high conversion efficiency under a light load. The DC-DC converter perform pulse width modulation (PWM) or pulse frequency modulation (PFM) and includes a drive control circuit generating a first drive signal and a second drive signal activating and inactivating a first transistor and a second transistor in a complementary manner. A reversed flow detection circuit detects current flowing to the second transistor and generates a detection signal controlling activation and inactivation of the second transistor. A detection signal invalidation circuit, coupled to the reversed flow detection circuit and the drive control circuit, receiving an operation switch signal and invalidating the detection signal in response to the operation switch signal during at least a certain period of the PWM.
摘要翻译： DC-DC转换器减轻反向电流并在轻负载下保持较高的转换效率。 DC-DC转换器执行脉冲宽度调制（PWM）或脉冲频率调制（PFM），并且包括产生第一驱动信号的驱动控制电路和以互补方式激活和去激活第一晶体管和第二晶体管的第二驱动信号。 逆流检测电路检测流向第二晶体管的电流，并产生控制第二晶体管的激活和失活的检测信号。 一个检测信号无效电路，耦合到反向流量检测电路和驱动控制电路，在PWM的至少一定周期期间响应于操作开关信号接收操作开关信号和使检测信号无效。
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公开(公告)号：US20060139194A1
公开(公告)日：2006-06-29
申请号：US11363049
申请日：2006-02-28
申请人： Morihito Hasegawa
发明人： Morihito Hasegawa
IPC分类号： H03M3/00
CPC分类号： H03M7/3011 , H03L7/1976 , H03M7/3022
摘要： A sigma-delta modulator for generating a modulation signal that modulates a frequency division ratio of a comparator/frequency divider of a PLL circuit. Series-connected integrators accumulate an input signal and output overflow signals when their accumulated values exceed a predetermined value. Differentiators transfer the overflow signals of the integrators. An adder multiplies output signals output from the differentiators by a predetermined coefficient and adds the products. A control circuit for transferring the accumulated value in synchronization with a clock signal of each integrator is connected between the integrator of a final stage and the integrator of the preceding stage. The control circuit reduces the modulation width of the modulation signal without reducing the order number of the modulator.
摘要翻译： 一种用于产生调制PLL电路的比较器/分频器的分频比的调制信号的Σ-Δ调制器。 串联连接的积分器累积输入信号，并在其累积值超过预定值时输出溢出信号。 微分器传输积分器的溢出信号。 加法器将从微分器输出的输出信号乘以预定系数，并将产物相加。 用于与每个积分器的时钟信号同步地传送累加值的控制电路连接在最后级的积分器和前一级的积分器之间。 控制电路减小调制信号的调制宽度，而不减少调制器的次序。
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48.发明授权DC-DC converter, power supply voltage supplying method, and power supply voltage supplying system 有权DC-DC转换器，电源电压供给方式和电源电压供给系统公开(公告)号：US07916503B2
公开(公告)日：2011-03-29
申请号：US12055437
申请日：2008-03-26
IPC分类号： H02M3/335
摘要： According to one aspect of the invention, a DC-DC converter including a soft-start function of a soft start in response to a soft-start signal, comprises: a detection circuit that detects whether the soft-start signal is active at an end of a soft-start operation; and an output voltage control circuit that controls an output voltage based on detection result of the detection circuit.
摘要翻译： 根据本发明的一个方面，一种DC-DC转换器，包括响应于软启动信号的软启动的软启动功能，包括：检测电路，用于检测软启动信号在末端是否有效 的软启动操作; 以及输出电压控制电路，其基于检测电路的检测结果来控制输出电压。
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公开(公告)号：US07609039B2
公开(公告)日：2009-10-27
申请号：US11370880
申请日：2006-03-09
申请人： Morihito Hasegawa
发明人： Morihito Hasegawa
IPC分类号： G05F1/40
CPC分类号： H02M3/1588 , H02M2001/0045 , Y02B70/1466
摘要： A DC-DC converter having conversion efficiency that is not lowered by input voltage change. A mode control circuit of the DC-DC converter monitors the input voltage, output voltage generated from the input voltage, and output current. The output current changes in accordance with the output voltage. Based on the input voltage, output voltage, and consumption current of a controller of the DC-DC converter, the mode control circuit generates a signal that is in accordance with load current in which efficiency of a switching regulator and efficiency of a linear regulator are substantially the same. The mode control circuit further compares a signal corresponding to the output current and the signal that is in accordance with the load current to generate a mode control signal. The controller operates the DC-DC converter as the switching regulator or the linear regulator in accordance with the mode control signal.
摘要翻译： 具有不会因输入电压变化而降低的转换效率的DC-DC转换器。 DC-DC转换器的模式控制电路监视输入电压，从输入电压产生的输出电压和输出电流。 输出电流根据输出电压变化。 基于DC-DC转换器的控制器的输入电压，输出电压和消耗电流，模式控制电路产生与开关调节器的效率和线性调节器的效率相关的负载电流的信号 基本相同。 模式控制电路还对与输出电流相对应的信号和根据负载电流的信号进行比较以产生模式控制信号。 控制器根据模式控制信号操作DC-DC转换器作为开关稳压器或线性稳压器。
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公开(公告)号：US07456623B2
公开(公告)日：2008-11-25
申请号：US11436534
申请日：2006-05-19
CPC分类号： H02M1/38 , H03K2017/307
摘要： A DC-DC converter prevents through current from flowing in an output transistor. A first transistor receives an input voltage. A second transistor is connected to the first transistor. A comparator is connected to the second transistor. The comparator detects current flowing through a choke coil based on the potential difference between two terminals of the second transistor to generate a switching control signal for turning the second transistor on and off. The second transistor and the comparator form an ideal diode. A control circuit of the DC-DC converter generates an activation signal for turning the first transistor on and off based on a pulse signal to keep an output voltage constant. A through current prevention pulse generation circuit generates a pulse signal for turning off the second transistor from before the first transistor is turned on to after the first transistor is turned on.
摘要翻译： DC-DC转换器防止直流电流流入输出晶体管。 第一晶体管接收输入电压。 第二晶体管连接到第一晶体管。 比较器连接到第二晶体管。 比较器基于第二晶体管的两个端子之间的电位差来检测流过扼流线圈的电流，以产生用于使第二晶体管接通和关断的开关控制信号。 第二个晶体管和比较器构成一个理想的二极管。 DC-DC转换器的控制电路基于脉冲信号产生用于使第一晶体管导通和截止的激活信号，以保持输出电压恒定。 通过电流防止脉冲产生电路在第一晶体管导通之后到第一晶体管导通之后产生用于使第二晶体管截止的脉冲信号。
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