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公开(公告)号：US20240223098A1
公开(公告)日：2024-07-04
申请号：US18545326
申请日：2023-12-19
发明人： Pengbo YANG , Zhen ZHU , Xiaoru GAO
CPC分类号： H02M3/33592 , H02M1/08 , H02M3/33507
摘要： A control circuit for an isolated power supply and an isolated power supply are disclosed. The control circuit includes a secondary control signal generation circuit, which, when detecting a voltage of a secondary winding reaches a first preset voltage value after a primary switching transistor is turned off, provides an instruction to turn on a synchronous rectification transistor. Following elapse of a predetermined period of time after the synchronous rectification transistor is turned on, the secondary control signal generation circuit detects a voltage/current of the synchronous rectification transistor, obtains a first electrical signal and derives a second electrical signal from the first electrical signal. When further detecting that the voltage/current of the synchronous rectification transistor reaches the value of the second electrical signal, the secondary control signal generation circuit provides an instruction to turn off the synchronous rectification transistor.
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公开(公告)号：US20240154537A1
公开(公告)日：2024-05-09
申请号：US18412069
申请日：2024-01-12
发明人： Yanmei GUO , Zhen ZHU , Yihui CHEN , Yuehui LI , Xiaoru GAO , Haifeng MIAO , Hanfei YANG
CPC分类号： H02M3/33592 , H02M1/38
摘要： A control circuit for an isolated power supply is disclosed, the control circuit includes a secondary-side drive signal generator, a secondary-side transistor switch turn-off detector and a primary-side control signal generator. The primary-side control signal generator is configured to: determine a second turn-on instant referring to an turn-off instant of the secondary-side synchronous rectification transistor from the turn-off acknowledgement signal; determine a first turn-on instant referring to a supposed turn-on instant for the primary-side transistor switch from the feedback signal of the output voltage of the isolated power supply; and determine the turn-on instant for the primary-side transistor switch from the second turn-on instant or the first turn-on instant whichever is later, and responsively generate the primary-side transistor switch control signal. This control circuit can effectively avoid shoot-through of primary- and secondary-side transistor switches at the cost of only insignificantly compromised feedback adjustment accuracy.
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公开(公告)号：US11929684B2
公开(公告)日：2024-03-12
申请号：US17550659
申请日：2021-12-14
发明人： Yanmei Guo , Zhen Zhu , Yihui Chen , Yuehui Li , Xiaoru Gao , Haifeng Miao , Hanfei Yang
CPC分类号： H02M3/33592 , H02M1/38
摘要： Isolated power supply control circuits, isolated power supply and control method thereof are disclosed, the control circuit for controlling an isolated power supply includes a secondary-side control signal generator and a primary-side control signal generator. The secondary-side control signal generator produces a secondary-side transistor switch control signal containing information about a turn-off instant of a secondary-side synchronous rectification transistor, which serves as a second turn-on instant. The primary-side control signal generator derives, from a feedback signal, a supposed turn-on instant for a primary-side transistor switch, which serves as a first turn-on instant. The primary side turn-on signal generator further derives a turn-on instant for the primary-side transistor switch from the second or first turn-on instant whichever is later and responsively generates a primary-side transistor switch control signal. This control circuit can effectively avoid shoot-through of primary- and secondary-side transistor switches at the cost of only insignificantly compromised feedback adjustment accuracy.
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4.发明公开公开(公告)号：US20230198400A1
公开(公告)日：2023-06-22
申请号：US18078236
申请日：2022-12-09
发明人： Danzhu LV
CPC分类号： H02M3/158 , H02M1/0022 , H02M1/0025
摘要： The present invention provides a controller, a switched-mode power supply and a method for controlling a switched-mode power supply. In response to a change of the switched-mode power supply from a continuous conduction mode to a discontinuous conduction mode, slope compensation is carried out with an output peak voltage raised by a compensating DC offset. Moreover, in response to a change of the switched-mode power supply from the discontinuous conduction mode to the continuous conduction mode, the compensating DC offset is subtracted from the peak voltage. In this way, an additional DC offset that would be introduced by a conventional slope compensation approach can be eliminated, maintaining a valley of a sampled feedback voltage constant both under steady load conditions and during load jumps.
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公开(公告)号：US20230046618A1
公开(公告)日：2023-02-16
申请号：US17886093
申请日：2022-08-11
发明人： Yanmei GUO , Zhen ZHU , Yuehui LI , Xiaoru GAO , Yihui CHEN , Haifeng MIAO , Rulong JIANG
摘要： An operation circuit and a chip pertaining to the field of integrated circuit design technology are disclosed by the present invention. The circuit includes a capacitor charging/discharging module and an error amplification module electrically connected to the capacitor charging/discharging module. The capacitor charging/discharging module is configured to receive first, second and third signals external to the capacitor charging/discharging module, and to output a reference signal and a feedback signal. The error amplification module is configured to receive the reference and feedback signals and output a target signal to the capacitor charging/discharging module based on the received reference and feedback signals. The first, second and third signals are all analog signals, and in a steady state, values of the target, first, second and third signals satisfy a predefined mathematical relationship.
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公开(公告)号：US20230034590A1
公开(公告)日：2023-02-02
申请号：US17875140
申请日：2022-07-27
发明人： Xiaohui CAI , Shungen SUN
IPC分类号： H05B45/345 , H05B45/375
摘要： A control circuit for a constant-current drive circuit, as well as a constant-current drive circuit are disclosed. The control circuit can obtain output information of the constant-current drive circuit and use it in combination with reference information to determine, according to an output condition corresponding to the current load of the constant-current drive circuit, a time point for the system to enter or exit a rapid drive mode. Therefore, it can be suitably used in various application scenarios to determine a time point for the system to entry into or exit from the rapid start mode. Compared with fast charging for a fixed period of time as used in the prior art, embodiments of the present invention can effectively overcome the problem of easy overshooting or inadequate acceleration during start as found in various applications.
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公开(公告)号：US11388792B2
公开(公告)日：2022-07-12
申请号：US17125758
申请日：2020-12-17
发明人： Jianjing Lyu
IPC分类号： H05B45/14 , H05B45/392 , H05B45/385 , H05B45/375 , H05B45/38
摘要： The present invention discloses a control circuit, a LED driving system, and a LED driving method. The control circuit receives a feedback signal from the power converter and generate a ZCD pulse signal accordingly, indicating one or more moments when the feedback signal decreases to zero, and receives a dimming signal and generate a minimum turn-off time signal accordingly, indicating the moment when a minimum turn-off time is passed. The control circuit generates a first turn-on signal according to the ZCD pulse signal and the minimum turn-off time signal to control a switching device within the power converter to turn on when the feedback signal decreases to zero and the minimum turn-off time is passed.
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公开(公告)号：US20220209662A1
公开(公告)日：2022-06-30
申请号：US17553968
申请日：2021-12-17
发明人： Shungen SUN
IPC分类号： H02M3/155
摘要： A control circuit for a power converter is disclosed. The power converter includes a switching circuit including a first switching transistor and a second switching transistor. The control circuit includes: a comparator having a first input configured to receive at least a reference signal, a second input configured to receive at least a feedback signal and an output configured to output a comparison signal; a minimum off-time generation circuit; an on-time generation circuit for producing an on-time signal for controlling both the first switching transistor and the second switching transistor; and a ramp compensation circuit configured to generate a ramp compensation signal.
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公开(公告)号：US20220197354A1
公开(公告)日：2022-06-23
申请号：US17525470
申请日：2021-11-12
发明人： Li-Qiang HU , Shun-Gen SUN
IPC分类号： G06F1/20 , G06F1/3206
摘要： The invention relates to a multi-phase power supply regulator and a temperature balance control method thereof. The method comprises: providing a multi-phase power supply regulator which includes a controller and a plurality of power stages, transmitting a plurality of control signals to the plurality of power stages respectively by the controller. Each of the plurality of power stages includes a temperature sampling unit, wherein outputs of the temperature sampling units are connected in parallel and the plurality of power stages outputs a temperature detection signal. The invention determines one of the plurality of power stages comprising highest temperature by sequentially adjusting the control signals, the temperature of the power stage is reduced, and the temperatures of the multi-phase power supply regulator are balanced.
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公开(公告)号：US11259382B2
公开(公告)日：2022-02-22
申请号：US17085863
申请日：2020-10-30
发明人： Wei-Jia Yu , Min-Min Fan , Feng Qi
IPC分类号： H05B45/3575 , H05B45/10 , H05B41/38
摘要： A control circuit and method for a bleeder, a chip, and a driver system. The bleeder control circuit is connected to a dimmer detector used for detecting the presence or absence of a dimmer and a type of the dimmer. The control circuit of the bleeder is used to receive a detection signal outputted by the dimmer detector, and generate a control signal for the bleeder according to the detection signal, the control signal is used to control an operating state of the bleeder. The application correspondingly generates a control signal for a bleeder according to a detection signal indicating the presence or absence of a dimmer and the type of the dimmer so as to control the bleeder to operate only at a given phase interval, and may thereby reduce the power consumption of the bleeder when ensuring the stable operation of a dimmer.
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