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公开(公告)号：US20240120846A1
公开(公告)日：2024-04-11
申请号：US18300530
申请日：2023-04-14
发明人： Yu-Chang Chen , Ta-Yung Yang , Kun-Yu Lin , Hsin-Yi Wu
CPC分类号： H02M3/33571 , H02M1/083 , H02M3/01
摘要： A resonant flyback power converter includes: a first transistor and a second transistor which are configured to switch a transformer and a resonant capacitor for generating an output voltage; and a switching control circuit generating first and second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal magnetizes the transformer. During a DCM (discontinuous conduction mode) operation, the second driving signal includes a resonant pulse for demagnetizing the transformer and a ZVS (zero voltage switching) pulse for achieving ZVS of the first transistor. The resonant pulse is skipped when the output voltage is lower than a low-voltage threshold.
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公开(公告)号：US11545908B2
公开(公告)日：2023-01-03
申请号：US17245043
申请日：2021-04-30
发明人： Wei-Hsu Chang , Kun-Yu Lin , Tzu-Chen Lin , Ta-Yung Yang
摘要： A flyback power converter circuit includes a transformer, a blocking switch, a primary side switch, a primary side controller circuit and a secondary side controller circuit. The transformer is coupled between an input voltage and an internal output voltage in an isolated manner. The blocking switch controls the electric connection between the internal output voltage and an external output voltage. In a standby mode, the internal output voltage is regulated to a standby voltage, and the blocking switch is controlled to be OFF; in an operation mode, the internal output voltage is regulated to an operating voltage, and the blocking switch is controlled to be ON, such that the external output voltage has the operating voltage. The standby voltage is smaller than the operating voltage, so that the power consumption of the flyback power converter circuit is reduced in the standby mode.
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公开(公告)号：US10715028B2
公开(公告)日：2020-07-14
申请号：US16586916
申请日：2019-09-28
发明人： Tzu-Chen Lin , Kun-Yu Lin , Li-Di Lo , Wei-Hsu Chang
摘要： A ZVS (zero voltage switching) control circuit for controlling a flyback power converter includes: a primary side controller circuit for generating a switching signal, to control a primary side switch; and a secondary side controller circuit for generating a synchronous rectifier (SR) control signal for controlling a synchronous rectifier switch. The SR control signal includes an SR-control pulse and a ZVS pulse. The SR-control pulse controls the synchronous rectifier switch to perform secondary side synchronous rectification. The secondary side controller circuit determines a trigger timing point of the ZVS pulse according to a waveform characteristic of a ringing signal, to control the synchronous rectifier switch to be ON for a predetermined period, thereby achieving zero voltage switching of the primary side switch. The primary side or the secondary side controller circuit includes a jitter controller for performing jitter control on the ZVS pulse.
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公开(公告)号：US10177670B1
公开(公告)日：2019-01-08
申请号：US15965915
申请日：2018-04-28
发明人： Tzu-Chen Lin , Kun-Yu Lin
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 controlling the primary side winding to convert the input power to an output power on the output node through the secondary side winding, 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 auxiliary ON time of the auxiliary switch during an OFF time of the primary side switch according to an estimated parasitic diode conduction time of a parasitic diode of the auxiliary switch; the auxiliary ON time is controlled to be substantially equal to and coincides with the estimated parasitic diode conduction time.
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公开(公告)号：US10291137B2
公开(公告)日：2019-05-14
申请号：US16040501
申请日：2018-07-19
发明人： Chien-Fu Tang , Isaac Y. Chen , Tzu-Chen Lin , Kun-Yu Lin , Li-Yang Hsiao , Yung-Chih Lai
摘要： A flyback power converter includes a transformer having an auxiliary winding for generating an auxiliary voltage and providing a supply voltage on a supply node; a primary side controller circuit which is powered by the supply voltage from the supply node; and a high voltage (HV) start-up circuit. The HV start-up circuit is coupled to an high voltage signal through a HV input terminal and generates the supply voltage through a supply output terminal, wherein when the supply voltage does not exceed a start-up voltage threshold, a HV start-up switch conducts the HV input terminal and the supply output terminal to provide the supply voltage, and when the supply voltage exceeds a start-up voltage threshold, the HV start-up switch is OFF. The HV start-up circuit and the primary side controller circuit are packaged in two separate integrated circuit packages respectively.
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公开(公告)号：US20190028033A1
公开(公告)日：2019-01-24
申请号：US16040501
申请日：2018-07-19
发明人： Chien-Fu Tang , Isaac Y. Chen , Tzu-Chen Lin , Kun-Yu Lin , Li-Yang Hsiao , Yung-Chih Lai
摘要： A flyback power converter includes a transformer having an auxiliary winding for generating an auxiliary voltage and providing a supply voltage on a supply node; a primary side controller circuit which is powered by the supply voltage from the supply node; and a high voltage (HV) start-up circuit. The HV start-up circuit is coupled to an high voltage signal through a HV input terminal and generates the supply voltage through a supply output terminal, wherein when the supply voltage does not exceed a start-up voltage threshold, a HV start-up switch conducts the HV input terminal and the supply output terminal to provide the supply voltage, and when the supply voltage exceeds a start-up voltage threshold, the HV start-up switch is OFF. The HV start-up circuit and the primary side controller circuit are packaged in two separate integrated circuit packages respectively.
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公开(公告)号：US20190013737A1
公开(公告)日：2019-01-10
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：US20240275275A1
公开(公告)日：2024-08-15
申请号：US18168580
申请日：2023-02-14
发明人： Ta-Yung Yang , Yu-Chang Chen , Hsin-Yi Wu , Kun-Yu Lin
CPC分类号： H02M3/01 , H02M1/083 , H02M1/32 , H02M3/33571 , H02M3/33592
摘要： A resonant asymmetrical half-bridge flyback power converter includes: a first transistor and a second transistor switching a transformer coupled to a capacitor for generating an output power; a voltage divider coupled to an auxiliary winding of the transformer; a differential sensing circuit which includes a first terminal and a second terminal coupled to the voltage divider to sense an auxiliary signal generated by the auxiliary winding for generating a peak signal and a demagnetization-time signal; and a PWM control circuit configured to generate a first PWM signal and a second PWM signal in accordance with the peak signal and the demagnetization-time signal, for controlling the first transistor and the second transistor respectively; wherein a period of an enabling state of the demagnetization-time signal is correlated to the output power level; wherein the peak signal is related to a quasi-resonance of the transformer after the transformer is demagnetized.
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公开(公告)号：US20240120845A1
公开(公告)日：2024-04-11
申请号：US18300458
申请日：2023-04-14
发明人： Yu-Chang Chen , Ta-Yung Yang , Kun-Yu Lin , Hsin-Yi Wu
CPC分类号： H02M3/33571 , H02M1/083 , H02M3/01 , H02M3/33592
摘要： A resonant flyback power converter includes: a first transistor and a second transistor which are configured to switch a transformer and a resonant capacitor for generating an output voltage; and a switching control circuit generating first and second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal magnetizes the transformer. The second driving signal includes a resonant pulse having a resonant pulse width and a ZVS pulse during the DCM operation. The resonant pulse is configured to demagnetize the transformer. The resonant pulse has a first minimum resonant period for a first level of the output load and a second minimum resonant period for a second level of the output load. The first level is higher than the second level and the second minimum resonant period is shorter than the first minimum resonant period.
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公开(公告)号：US20210384838A1
公开(公告)日：2021-12-09
申请号：US17245043
申请日：2021-04-30
发明人： Wei-Hsu Chang , Kun-Yu Lin , Tzu-Chen Lin , Ta-Yung Yang
摘要： A flyback power converter circuit includes a transformer, a blocking switch, a primary side switch, a primary side controller circuit and a secondary side controller circuit. The transformer is coupled between an input voltage and an internal output voltage in an isolated manner. The blocking switch controls the electric connection between the internal output voltage and an external output voltage. In a standby mode, the internal output voltage is regulated to a standby voltage, and the blocking switch is controlled to be OFF; in an operation mode, the internal output voltage is regulated to an operating voltage, and the blocking switch is controlled to be ON, such that the external output voltage has the operating voltage. The standby voltage is smaller than the operating voltage, so that the power consumption of the flyback power converter circuit is reduced in the standby mode.
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