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21.发明申请公开(公告)号：US20180301974A1
公开(公告)日：2018-10-18
申请号：US15878483
申请日：2018-01-24
发明人： Kun-Yu Lin , Tzu-Chen Lin , Wei-Hsu Chang , Ta-Yung Yang
摘要： A flyback power converter circuit includes: a transformer, including a primary winding coupled to an input power and a secondary winding coupled to an output node; a primary side switch coupled to the primary winding for switching the input power to generate an output power on the output node through the secondary winding; a clamping circuit including an auxiliary switch and an auxiliary capacitor which are connected in series to form an auxiliary branch which is connected with the primary winding in parallel; and a conversion control circuit adjusting an auxiliary dead time according to a primary side switch related signal and a switching voltage related signal such that the primary side switch is zero voltage switching at a time point when the primary side switch is turned ON.
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公开(公告)号：US20240128876A1
公开(公告)日：2024-04-18
申请号：US18335195
申请日：2023-06-15
发明人： Yu-Chang Chen , Ta-Yung Yang , Kun-Yu Lin , Fu-Ciao Syu , Chia-Hsien Yang , Hsin-Yi Wu
CPC分类号： H02M3/33507 , H02M1/083
摘要： A switching control circuit for use in controlling a resonant flyback power converter generates a first driving signal and a second driving signal. The first driving signal is configured to turn on the first transistor to generate a first current to magnetize a transformer and charge a resonant capacitor. The transformer and charge a resonant capacitor are connected in series. The second driving signal is configured to turn on the second transistor to generate a second current to discharge the resonant capacitor. During a power-on period of the resonant flyback power converter, the second driving signal includes a plurality of short-pulses configured to turn on the second transistor for discharging the resonant capacitor. A pulse-width of the short-pulses of the second driving signal is short to an extent that the second current does not exceed a current limit threshold.
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公开(公告)号：US20220006392A1
公开(公告)日：2022-01-06
申请号：US17356767
申请日：2021-06-24
发明人： Yu-Chang Chen , Wei-Hsu Chang , Kun-Yu Lin , Ta-Yung Yang
摘要： A flyback converter includes a power transformer, a primary side switch, a secondary side switch and a controller. A secondary side switching signal has an SR pulse for achieving synchronous rectification, and a ZVS pulse for achieving zero voltage switching. The ZVS pulse is enabled according to a first characteristic of a resonance waveform, whereas, a primary side switching signal is enabled according to a second characteristic of resonance waveform. When an output current increases, the primary side switching signal is disabled during an inhibition interval, such that primary side switching signal does not overlap with the ZVS pulse, thereby preventing the primary and secondary side switches from being both conductive simultaneously. The inhibition interval is correlated with a rising edge of the primary side switching signal in a previous switching period and a resonance period of the resonance waveform.
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公开(公告)号：US10291113B2
公开(公告)日：2019-05-14
申请号：US16000066
申请日：2018-06-05
发明人： Kun-Yu Lin
摘要： A flyback power converter includes a transformer having a primary winding receiving an input power, a secondary winding generating an output power, and an auxiliary winding generating an auxiliary voltage and providing a supply voltage, a primary side switch controlling the primary winding, a start-up switch coupled to the input voltage and the supply voltage, and a primary side controller supplied by the supply voltage. The primary side controller includes a shared pin coupled to a control terminal of the start-up switch, a start-up circuit for controlling the start-up switch to be conductive through the shared pin when the supply voltage is lower than a threshold, and a signal processing circuit receiving an auxiliary signal related to the auxiliary voltage through the shared pin and operating the flyback power converter accordingly, wherein the shared pin, besides providing a function of controlling the start-up switch, provides another function.
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公开(公告)号：US10181782B2
公开(公告)日：2019-01-15
申请号：US15892724
申请日：2018-02-09
发明人： Kun-Yu Lin , Tzu-Chen Lin , Wei-Hsu Chang , Ta-Yung Yang
摘要： A flyback power converter circuit includes: a transformer including a primary side winding coupled to an input power and a secondary side winding coupled to an output node, wherein the input power includes an input voltage; a primary side switch coupled to the primary side winding for controlling the input power to generate an output power on the output node through the secondary side winding, wherein the output power includes an output voltage; a clamping circuit including an auxiliary switch and an auxiliary capacitor connected in series to form an auxiliary branch which is connected with the primary side winding in parallel; and a conversion control circuit for adjusting an ON time of the auxiliary switch according to at least one of a current related signal, the input voltage, and the output voltage, such that the primary side switch is zero voltage switching when turning ON.
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公开(公告)号：US20190013740A1
公开(公告)日：2019-01-10
申请号：US16023565
申请日：2018-06-29
发明人： Kun-Yu Lin
CPC分类号： H02M3/33569 , H02M1/08 , H02M1/32 , H02M1/36 , H02M3/33507 , H02M2001/327
摘要： A flyback power converter includes a transformer having a primary winding for receiving an input power, a secondary winding for generating an output power, and an auxiliary winding for generating a supply voltage, a primary side switch coupled to the primary winding, a high voltage start-up switch coupled to the input voltage and the controller supply voltage, and a primary side controller powered by the controller supply voltage. The primary side controller includes a multi-function pin coupled to a control terminal of the high voltage start-up switch, a high voltage start-up circuit for controlling the high voltage start-up switch to be ON through the multi-function pin when the controller supply voltage is lower than a threshold, and a protection control circuit which is coupled to an protection sensing signal through the multi-function pin; the protection control circuit operates the flyback power converter according to the protection sensing signal.
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