公开(公告)号：US08873254B2

公开(公告)日：2014-10-28

申请号：US13418285

申请日：2012-03-12

申请人： John D. Morris ,  Michael G. Negrete ,  Min Chen

发明人： John D. Morris ,  Michael G. Negrete ,  Min Chen

IPC分类号： H02M3/335

CPC分类号： H02M3/335 ,  H02M2001/0032 ,  Y02B70/16

摘要： A flyback converter uses primary side sensing to sense the output voltage for regulation feedback. A comparator on the primary side detects whether the output voltage has exceeded a predetermined regulated voltage by a first threshold to detect an over-voltage condition, resulting from a current generated by the converter exceeding the load current. Triggering of the comparator causes the converter to enter a non-switching sleep mode, whereby the output voltage droops over a period of time. When the output voltage has drooped below the predetermined regulated voltage by a second threshold, a synchronous rectifier is controlled to turn on, then off, to generate a pulse in the primary winding. Upon detection of the pulse, the sleep mode is terminated, and normal operation resumes until a regulated voltage is achieved or until the first threshold is again exceeded by the output voltage.

摘要翻译： 反激转换器使用初级侧感测来检测输出电压以进行调节反馈。 初级侧的比较器检测输出电压是否超过预定的调节电压第一阈值，以检测由转换器产生的电流超过负载电流导致的过电压状况。 比较器的触发使得转换器进入非切换睡眠模式，由此输出电压在一段时间内下降。 当输出电压下降到低于预定调节电压第二阈值时，同步整流器被控制为接通，然后关断，以在初级绕组中产生脉冲。 当检测到脉冲时，停止睡眠模式，并且恢复正常操作，直到达到稳定电压或直到输出电压再次超过第一阈值为止。

公开(公告)号：US20130235620A1

公开(公告)日：2013-09-12

申请号：US13418285

申请日：2012-03-12

申请人： John D. Morris ,  Michael G. Negrete ,  Min Chen

发明人： John D. Morris ,  Michael G. Negrete ,  Min Chen

IPC分类号： H02M3/335

CPC分类号： H02M3/335 ,  H02M2001/0032 ,  Y02B70/16

摘要： A flyback converter uses primary side sensing to sense the output voltage for regulation feedback. A comparator on the primary side detects whether the output voltage has exceeded a predetermined regulated voltage by a first threshold to detect an over-voltage condition, resulting from a current generated by the converter exceeding the load current. Triggering of the comparator causes the converter to enter a non-switching sleep mode, whereby the output voltage droops over a period of time. When the output voltage has drooped below the predetermined regulated voltage by a second threshold, a synchronous rectifier is controlled to turn on, then off, to generate a pulse in the primary winding. Upon detection of the pulse, the sleep mode is terminated, and normal operation resumes until a regulated voltage is achieved or until the first threshold is again exceeded by the output voltage.

摘要翻译： 反激转换器使用初级侧感测来检测输出电压以进行调节反馈。 初级侧的比较器检测输出电压是否超过预定的调节电压第一阈值，以检测由转换器产生的电流超过负载电流导致的过电压状况。 比较器的触发使得转换器进入非切换睡眠模式，由此输出电压在一段时间内下降。 当输出电压下降到低于预定调节电压第二阈值时，同步整流器被控制为接通，然后关断，以在初级绕组中产生脉冲。 当检测到脉冲时，停止睡眠模式，并且恢复正常操作，直到达到稳定电压或直到输出电压再次超过第一阈值为止。

公开(公告)号：US08570772B2

公开(公告)日：2013-10-29

申请号：US13359447

申请日：2012-01-26

申请人： John D. Morris ,  Michael G. Negrete ,  Min Chen

发明人： John D. Morris ,  Michael G. Negrete ,  Min Chen

IPC分类号： H02M3/335

CPC分类号： H02M1/32 ,  H02M3/33584 ,  H02M3/33592 ,  H02M2001/0032 ,  Y02B70/1475 ,  Y02B70/16

摘要： A flyback converter uses primary side sensing to sense the output voltage for regulation feedback. Such sensing requires a predetermined minimum duty cycle even with very light load currents. Therefore, such a minimum duty cycle may create an over-voltage condition. In the flyback phase, after a minimum duty cycle of the power switch at light load currents, a synchronous rectifier turns off approximately when the current through the secondary winding falls to zero to create a discontinuous mode. If it is detected that there is an over-voltage, the synchronous rectifier is turned on for a brief interval to draw a reverse current through the secondary winding. When the synchronous rectifier shuts off, a current flows through the primary winding via a drain-body diode while the power switch is off. Therefore, excess power is transferred from the secondary side to the power source to reduce the over-voltage so is not wasted.

摘要翻译： 反激转换器使用初级侧感测来检测输出电压以进行调节反馈。 即使使用非常轻的负载电流，这种感测也需要预定的最小占空比。 因此，这样的最小占空比可能产生过电压状态。 在反激阶段，在轻负载电流下电源开关的最小占空比之后，当通过次级绕组的电流下降到零时，同步整流器大致关闭以产生不连续模式。 如果检测到存在过电压，则同步整流器接通短暂的间隔以通过次级绕组产生反向电流。 当同步整流器关闭时，电源开关关闭时，电流通过漏极体二极管流过初级绕组。 因此，多余的功率从次级侧传输到电源，以减少过电压，因此不会浪费。

公开(公告)号：US20130194836A1

公开(公告)日：2013-08-01

申请号：US13359447

申请日：2012-01-26

申请人： John D. Morris ,  Michael G. Negrete ,  Min Chen

发明人： John D. Morris ,  Michael G. Negrete ,  Min Chen

IPC分类号： H02M3/335

CPC分类号： H02M1/32 ,  H02M3/33584 ,  H02M3/33592 ,  H02M2001/0032 ,  Y02B70/1475 ,  Y02B70/16

摘要： A flyback converter uses primary side sensing to sense the output voltage for regulation feedback. Such sensing requires a predetermined minimum duty cycle even with very light load currents. Therefore, such a minimum duty cycle may create an over-voltage condition. In the flyback phase, after a minimum duty cycle of the power switch at light load currents, a synchronous rectifier turns off approximately when the current through the secondary winding falls to zero to create a discontinuous mode. If it is detected that there is an over-voltage, the synchronous rectifier is turned on for a brief interval to draw a reverse current through the secondary winding. When the synchronous rectifier shuts off, a current flows through the primary winding via a drain-body diode while the power switch is off. Therefore, excess power is transferred from the secondary side to the power source to reduce the over-voltage so is not wasted.

摘要翻译： 反激转换器使用初级侧感测来检测输出电压以进行调节反馈。 即使使用非常轻的负载电流，这种感测也需要预定的最小占空比。 因此，这样的最小占空比可能产生过电压状态。 在反激阶段，在轻负载电流下电源开关的最小占空比之后，当通过次级绕组的电流下降到零时，同步整流器大致关闭以产生不连续模式。 如果检测到存在过电压，则同步整流器接通短暂的间隔以通过次级绕组产生反向电流。 当同步整流器关闭时，电源开关关闭时，电流通过漏极体二极管流过初级绕组。 因此，多余的功率从次级侧传输到电源，以减少过电压，因此不会浪费。

公开(公告)号：US20080031017A1

公开(公告)日：2008-02-07

申请号：US11498130

申请日：2006-08-03

申请人： David R. Ng ,  Michael G. Negrete

发明人： David R. Ng ,  Michael G. Negrete

IPC分类号： H02M3/335

CPC分类号： H02M3/33523 ,  H02M3/33507

摘要： A regulator may include a load voltage sensing circuit configured to generate a feedback signal representative of output voltage from an isolated flyback converter. The regulator may include a pulse generator configured to controllably generate the pulses and to increase at least one off time and at least one period of the pulses after a load on the flyback converter decreases.

公开(公告)号：US07471522B2

公开(公告)日：2008-12-30

申请号：US11498130

申请日：2006-08-03

申请人： David R. Ng ,  Michael G. Negrete

发明人： David R. Ng ,  Michael G. Negrete

IPC分类号： H02M3/335

CPC分类号： H02M3/33523 ,  H02M3/33507

摘要： A regulator may include a load voltage sensing circuit configured to generate a feedback signal representative of output voltage from an isolated flyback converter. The regulator may include a pulse generator configured to controllably generate the pulses and to increase at least one off time and at least one period of the pulses after a load on the flyback converter decreases.

摘要翻译： 调节器可以包括负载电压感测电路，其被配置为产生代表来自隔离反激转换器的输出电压的反馈信号。 调节器可以包括脉冲发生器，其被配置为可控地产生脉冲并且在反激转换器上的负载减小之后增加至少一个关闭时间和至少一个脉冲周期。

公开(公告)号：US07463497B2

公开(公告)日：2008-12-09

申请号：US11499726

申请日：2006-08-07

申请人： Michael G. Negrete

发明人： Michael G. Negrete

IPC分类号： H02M3/335

CPC分类号： H02M3/33507

摘要： A regulator for an isolated flyback power supply using primary side sensing. The regulator may include an error circuit configured to generate an error signal representative of the difference between a target value and a measured value, a sample and hold circuit, and a controller circuit. The controller circuit may be configured to cause the sample and hold circuit to sample the value of a derived signal that is derived from a connection to the primary winding at a time when the primary winding is decoupled from the energy-supplying circuit and the diode is conducting current, and to hold the sampled value at least until the diode stops conducting current. The controller circuit may also be configured to cause the held value to be the measured value used by the error circuit.

摘要翻译： 用于使用初级侧感测的隔离反激式电源的稳压器。 调节器可以包括被配置为产生表示目标值和测量值之间的差的误差信号的误差电路，采样和保持电路以及控制器电路。 控制器电路可以被配置为使得采样和保持电路在从初级绕组与能量供应电路分离之间采样从与初级绕组的连接导出的导出信号的值，并且二极管是 导通电流，并保持采样值至少直到二极管停止导通电流。 控制器电路还可以被配置为使保持值成为误差电路使用的测量值。

公开(公告)号：US20080031018A1

公开(公告)日：2008-02-07

申请号：US11499726

申请日：2006-08-07

申请人： Michael G. Negrete

发明人： Michael G. Negrete

IPC分类号： H02M3/335

CPC分类号： H02M3/33507

摘要： A regulator for an isolated flyback power supply using primary side sensing. The regulator may include an error circuit configured to generate an error signal representative of the difference between a target value and a measured value, a sample and hold circuit, and a controller circuit. The controller circuit may be configured to cause the sample and hold circuit to sample the value of a derived signal that is derived from a connection to the primary winding at a time when the primary winding is decoupled from the energy-supplying circuit and the diode is conducting current, and to hold the sampled value at least until the diode stops conducting current. The controller circuit may also be configured to cause the held value to be the measured value used by the error circuit.