-
公开(公告)号：US11799382B2
公开(公告)日：2023-10-24
申请号：US17191073
申请日：2021-03-03
发明人： Chen-Hua Chiu , Sangcheol Moon
CPC分类号： H02M3/33573 , H02M1/0058 , H02M1/083 , H02M1/0054
摘要： It may be desirable to limit the switching frequency of a pulse frequency modulated (PFM) resonant converter, however certain load conditions and/or startup condition require high switching frequencies to regulate an output voltage. The disclosed resonant converter can limit a maximum switching frequency while regulating an output voltage by shifting from PFM to phase-difference modulation based on a load condition. The appropriate modulation can be applied based on a comparison between a charge-control signal and a load-control signal.
-
公开(公告)号：US10110137B1
公开(公告)日：2018-10-23
申请号：US15486919
申请日：2017-04-13
发明人： Sangcheol Moon , Hangseok Choi , Chi Chen Chung , Cheng-Sung Chen
IPC分类号： H02M3/335
摘要： A Synchronous Rectifier (SR) controller circuit includes a dead time evaluation circuit, an offset voltage controller circuit, an off threshold control circuit, and a comparator circuit. The dead time evaluation circuit produces an indication of whether a measured dead time of an SR switching device is less than a target dead time. The offset voltage controller circuit determines an offset count using the indication, an offset voltage using the offset count, and high and low saturation indicators according to the offset count. The off threshold control circuit determines a threshold count using the high and low saturation indicators and an off threshold voltage using the threshold count. The comparator circuit determines whether a measured voltage of the SR switching device is greater than a virtual off threshold voltage, the virtual off threshold voltage corresponding to the off threshold voltage minus the offset voltage.
-
公开(公告)号：US11303217B2
公开(公告)日：2022-04-12
申请号：US16450116
申请日：2019-06-24
发明人： Sangcheol Moon , Dongjin Park
摘要： Resonant power converters. Example embodiments are methods of operating a rectification controller including sensing a drain-source voltage of a synchronous rectification (SR) field effect transistor (FET); setting an adaptive delay time corresponding to a time interval between a first state transition and a second state transition, with each of the first and second state transitions corresponding to the drain-source voltage transitioning between being greater than the adaptive delay voltage and being less than the adaptive delay voltage; and driving the SR FET to a conductive state after the drain-source voltage having been less than the on-threshold voltage for longer than the adaptive delay time.
-
公开(公告)号：US10164543B2
公开(公告)日：2018-12-25
申请号：US15486926
申请日：2017-04-13
发明人： Sangcheol Moon , Jintae Kim , Hangseok Choi
IPC分类号： H02M3/335
摘要： A method for controlling a power converter includes generating a load detection signal in response to a conduction signal and a driver input signal, and generating a gate control signal in response to the load detection signal. The gate control signal is delayed by a delay amount in response to the load detection signal. An apparatus for controlling a power converter includes a gate signal control circuit generating a load detection signal in response to a conduction signal and a driver input signal, and a synchronous rectifier (SR) driver generating a gate control signal in response to the load detection signal.
-
公开(公告)号：US11799380B2
公开(公告)日：2023-10-24
申请号：US16839185
申请日：2020-04-03
发明人： Sangcheol Moon , Dongjin Park , Jihoon Jang
CPC分类号： H02M3/33569 , H02M1/36 , H02M1/0009
摘要： Hybrid control of switching power converters. One example embodiment is a method including: operating the switching power converter such that a charge control switch has a conduction time in each switching cycle; and making adjustments to the conduction time, the adjustments dominated by voltage-mode control when the switching power supply is in a first operational state, and the adjustments dominated by current-mode control when the switching power supply is in a second operational state distinct from the first operational state.
-
公开(公告)号：US10992234B2
公开(公告)日：2021-04-27
申请号：US15877573
申请日：2018-01-23
发明人： Sangcheol Moon , Jintae Kim , Chi-Chen Chung , Cheng-Sung Chen
摘要： A circuit for controlling a power converter includes an SR switching device, a light load detection circuit generating a load detection signal in response to a conduction signal and an operation mode signal, and an SR driver generating a control signal having a value according to the load detection signal and provide the control signal to the SR switching device. A method of controlling a power converter includes generating a load detection signal in response to a conduction signal and an operation mode signal and generating a control signal having a value according to the load detection signal. The control signal has a first value when the load detection signal is asserted and has a second value when the load detection signal is de-asserted.
-
公开(公告)号：US10608544B2
公开(公告)日：2020-03-31
申请号：US16135166
申请日：2018-09-19
发明人： Sangcheol Moon , Hangseok Choi , Chi Chen Chung , Cheng-Sung Chen
IPC分类号： H02M3/335
摘要： A Synchronous Rectifier (SR) controller circuit includes a dead time evaluation circuit, an offset voltage controller circuit, an off threshold control circuit, and a comparator circuit. The dead time evaluation circuit produces an indication of whether a measured dead time of an SR switching device is less than a target dead time. The offset voltage controller circuit determines an offset count using the indication, an offset voltage using the offset count, and high and low saturation indicators according to the offset count. The off threshold control circuit determines a threshold count using the high and low saturation indicators and an off threshold voltage using the threshold count. The comparator circuit determines whether a measured voltage of the SR switching device is greater than a virtual off threshold voltage, the virtual off threshold voltage corresponding to the off threshold voltage minus the offset voltage.
-
公开(公告)号：US10320285B2
公开(公告)日：2019-06-11
申请号：US16037267
申请日：2018-07-17
发明人： Jintae Kim , Sangcheol Moon
摘要： A control circuit for controlling a Switch-Mode Power Supply (SMPS) includes a current conduction duration determining circuit, an integrator circuit, a feedback circuit, a sawtooth generator circuit, and a gate control circuit. The current conduction duration determining circuit produces a duration signal according to a duration of a current of the SMPS. The integrator circuit produces an integrator output corresponding to an integral over time of a magnitude of the current. The feedback circuit produces a comparison voltage according to an output voltage of the SMPS. The sawtooth generator circuit produces a sawtooth signal using the comparison voltage and duration signal, such as by dividing the comparison voltage by the duration signal. The gate control circuit generates a gate signal for controlling a power switch of the SMPS according to a comparison of the sawtooth signal to the integrator output. The SMPS may be a Power Factor Correction circuit.
-
-
-
-
-
-
-
搜索结果
8 条记录 (耗时 0.018 秒)
