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1.发明申请公开(公告)号：US20160172962A1
公开(公告)日：2016-06-16
申请号：US14960403
申请日：2015-12-06
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yu-Kai Chen , Hsin-Yi Wu , Tzu-Chen Lin
CPC classification number: H02M3/33592 , H02M1/32 , H02M2001/0012 , Y02B70/1475
Abstract: The present invention discloses a flyback converter, a primary side control circuit therein, and a control method thereof. The flyback converter includes: a transformer circuit, a power switch circuit, a primary side control circuit, a synchronous rectification (SR) switch, and a synchronous rectification (SR) control circuit. When a feedback signal indicates that a difference between a target output voltage and an actual output voltage increases, the primary side control circuit increases an operation frequency of an operation signal by step-wisely reducing a cycle period of the operation signal in response to the increase of the difference, wherein the cycle period of the operation signal is reduced by a predetermined unit of time in each step, such that the cycle period of the operation signal is a step function of the increase of the difference.
Abstract translation: 本发明公开了一种反激式转换器，其中的一次侧控制电路及其控制方法。 反激式转换器包括：变压器电路，电源开关电路，初级侧控制电路，同步整流（SR）开关和同步整流（SR）控制电路。 当反馈信号表示目标输出电压和实际输出电压之间的差异增大时，初级侧控制电路通过逐步减小操作信号的循环周期来增加操作信号的操作频率，以响应于增加 的差别，其中在每个步骤中操作信号的周期周期减少预定的时间单位，使得操作信号的周期周期是差的增加的阶梯函数。
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公开(公告)号：US09755530B2
公开(公告)日：2017-09-05
申请号：US15144610
申请日：2016-05-02
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Li-Di Luo , Yu-Kai Chen , Yu-Chang Chen
CPC classification number: H02M3/33523 , H02M1/08 , H02M3/33592 , Y02B70/1475
Abstract: The present invention discloses a power converter with synchronous control function and control method thereof. The power converter includes: a transformer, a power switch, a switch control unit, a signal coupling circuit, a synchronous rectifying switch and a secondary side control circuit. The switch control unit generates an operation signal according to a feedback signal, and generates a first synchronous signal which is related to the operation signal. The signal coupling circuit couples the first synchronous signal to generate a second synchronous signal. The synchronous rectifying switch is turned ON/OFF according to a synchronous rectifying switch signal, for synchronous rectification. The secondary side control circuit generates the synchronous rectifying switch signal according to a secondary side level detection signal and the second synchronous signal, to control the synchronous rectifying switch. The ON time of the power switch and the ON time of the synchronous rectifying switch do not overlap.
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公开(公告)号：US20200007046A1
公开(公告)日：2020-01-02
申请号：US16419041
申请日：2019-05-22
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yu-Kai Chen
Abstract: A power supply circuit includes a power converter circuit, a path switch and a protocol control circuit. The protocol control circuit controls the power converter circuit and the path switch. The protocol control circuit includes: a shared pin and a signal determination circuit. The shared pin is coupled to the bus node via the temperature sensitive device and transmits different signals having different functions under at least two different modes. The signal determination circuit senses a voltage at the bus node via the shared pin under a power start-up mode, to determine whether to control the path switch to conduct the power path, thereby determining whether to enter a power supply mode. The signal determination circuit receives a temperature signal generated by the temperature sensitive device via the shared pin under the power supply mode, to determine an ambient temperature where the temperature sensitive is located.
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Patent Agency Ranking
公开(公告)号：US10320304B2
公开(公告)日：2019-06-11
申请号：US15290771
申请日：2016-10-11
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yu-Kai Chen , Kuang-Fu Chang
Abstract: The present invention provides a power converter, a secondary side controller, and a short circuit determination method for a current sensing resistor of the power converter. The power converter is controlled by a power switch to convert an input voltage to an output voltage, and provide an output current to an output terminal. The power converter senses the output current by a current sensing resistor to generate first information which relates to the output current. The power converter generates second information according to an ON time, an OFF time or a switching period of the power switch, or according to an energy-releasing period for transmitting energy to the output terminal, wherein the second information indicates whether there is a substantial amount of energy transmitted to the output terminal. By checking whether the first information and the second information are contradictory to each other, a malfunction can be found.
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公开(公告)号：US09627987B2
公开(公告)日：2017-04-18
申请号：US14960403
申请日：2015-12-06
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yu-Kai Chen , Hsin-Yi Wu , Tzu-Chen Lin
CPC classification number: H02M3/33592 , H02M1/32 , H02M2001/0012 , Y02B70/1475
Abstract: The present invention discloses a flyback converter, a primary side control circuit therein, and a control method thereof. The flyback converter includes: a transformer circuit, a power switch circuit, a primary side control circuit, a synchronous rectification (SR) switch, and a synchronous rectification (SR) control circuit. When a feedback signal indicates that a difference between a target output voltage and an actual output voltage increases, the primary side control circuit increases an operation frequency of an operation signal by step-wisely reducing a cycle period of the operation signal in response to the increase of the difference, wherein the cycle period of the operation signal is reduced by a predetermined unit of time in each step, such that the cycle period of the operation signal is a step function of the increase of the difference.
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公开(公告)号：US10530264B1
公开(公告)日：2020-01-07
申请号：US16419041
申请日：2019-05-22
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yu-Kai Chen
Abstract: A power supply circuit includes a power converter circuit, a path switch and a protocol control circuit. The protocol control circuit controls the power converter circuit and the path switch. The protocol control circuit includes: a shared pin and a signal determination circuit. The shared pin is coupled to the bus node via the temperature sensitive device and transmits different signals having different functions under at least two different modes. The signal determination circuit senses a voltage at the bus node via the shared pin under a power start-up mode, to determine whether to control the path switch to conduct the power path, thereby determining whether to enter a power supply mode. The signal determination circuit receives a temperature signal generated by the temperature sensitive device via the shared pin under the power supply mode, to determine an ambient temperature where the temperature sensitive is located.
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公开(公告)号：US20170338746A1
公开(公告)日：2017-11-23
申请号：US15290771
申请日：2016-10-11
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yu-Kai Chen , Kuang-Fu Chang
CPC classification number: H02M3/33592 , H02M1/08 , H02M1/32 , H02M3/33507 , H02M2001/0009
Abstract: The present invention provides a power converter, a secondary side controller, and a short circuit determination method for a current sensing resistor of the power converter. The power converter is controlled by a power switch to convert an input voltage to an output voltage, and provide an output current to an output terminal. The power converter senses the output current by a current sensing resistor to generate first information which relates to the output current. The power converter generates second information according to an ON time, an OFF time or a switching period of the power switch, or according to an energy-releasing period for transmitting energy to the output terminal, wherein the second information indicates whether there is a substantial amount of energy transmitted to the output terminal. By checking whether the first information and the second information are contradictory to each other, a malfunction can be found.
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8.发明申请POWER CONVERTER WITH SYNCHRONOUS CONTROL FUNCTION AND CONTROL METHOD THEREOF 有权具有同步控制功能的电力转换器及其控制方法公开(公告)号：US20160344296A1
公开(公告)日：2016-11-24
申请号：US15144610
申请日：2016-05-02
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Li-Di Luo , Yu-Kai Chen , Yu-Chang Chen
CPC classification number: H02M3/33523 , H02M1/08 , H02M3/33592 , Y02B70/1475
Abstract: The present invention discloses a power converter with synchronous control function and control method thereof. The power converter includes: a transformer, a power switch, a switch control unit, a signal coupling circuit, a synchronous rectifying switch and a secondary side control circuit. The switch control unit generates an operation signal according to a feedback signal, and generates a first synchronous signal which is related to the operation signal. The signal coupling circuit couples the first synchronous signal to generate a second synchronous signal. The synchronous rectifying switch is turned ON/OFF according to a synchronous rectifying switch signal, for synchronous rectification. The secondary side control circuit generates the synchronous rectifying switch signal according to a secondary side level detection signal and the second synchronous signal, to control the synchronous rectifying switch. The ON time of the power switch and the ON time of the synchronous rectifying switch do not overlap.
Abstract translation: 本发明公开了一种具有同步控制功能的电力转换器及其控制方法。 电力转换器包括：变压器，电源开关，开关控制单元，信号耦合电路，同步整流开关和次级侧控制电路。 开关控制单元根据反馈信号产生操作信号，并产生与操作信号相关的第一同步信号。 信号耦合电路耦合第一同步信号以产生第二同步信号。 同步整流开关根据同步整流开关信号导通/关断，用于同步整流。 次级侧控制电路根据次级侧电平检测信号和第二同步信号生成同步整流开关信号，以控制同步整流开关。 电源开关的接通时间和同步整流开关的接通时间不重叠。
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