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公开(公告)号：US11527960B2
公开(公告)日：2022-12-13
申请号：US16865762
申请日：2020-05-04
发明人： Yushan Li , Liming Ye , Heping Dai
摘要： An apparatus includes a pulse-width modulation (PWM) generator configured to generate a PWM signal for controlling a power switch of a power converter, a bias switch and a bias capacitor connected in series and coupled to a magnetic winding of the power converter and a comparator having a first input connected to the bias capacitor, a second input connected to a predetermined reference and an output configured to generate a signal for controlling the bias switch to allow a magnetizing current from the magnetic winding to charge the bias capacitor when a voltage across the bias capacitor is less than the predetermined reference.
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公开(公告)号：US20220393578A1
公开(公告)日：2022-12-08
申请号：US17685702
申请日：2022-03-03
发明人： Liming Ye , Heping Dai , Ning Wang , Gang Ye
摘要： A method includes detecting a voltage signal of a three-level power converter, the voltage signal indicative of a capacitor voltage balancing in the three-level power converter, and dynamically adjusting an operating variable to adjust the voltage signal until the capacitor voltage balancing in the three-level power converter satisfies a criteria.
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公开(公告)号：US11588397B2
公开(公告)日：2023-02-21
申请号：US16899361
申请日：2020-06-11
发明人： Huibin Zhu , Heping Dai , Liming Ye , Yongtao Liang , Weiping Liu
摘要： A power conversion system includes a first power conversion port including a three-level power factor correction device and a primary power conversion circuit, a second power conversion port including a three-level rectifier and a third power conversion port including a rectifier, the first power conversion port, the second power conversion port and the third power conversion port magnetically coupled to each other through a transformer.
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公开(公告)号：US11515709B2
公开(公告)日：2022-11-29
申请号：US16889520
申请日：2020-06-01
发明人： Xiaolin Mao , Heping Dai , Dianbo Fu , Huibin Zhu
摘要： System, device and method for exporting power are provided including at least one AC optimizer with plurality of DC inputs each connecting with respective one of plurality of DC sources, and independent maximum power point tracking (MPPT) performed for each respective DC source to extract power from each DC source for output and coupling to AC grid. When multiple AC optimizers are employed, with each AC optimizer having multiple DC inputs, each DC input can be connected to PV module with independent MPPT function. Since, each AC optimizer can serve multiple PV modules, significant cost saving and efficiencies can be achieved. Optionally, on PV sub-module level, each of the multiple DC inputs can be used as an independent MPPT channel for a PV sub-module cell string.
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公开(公告)号：US11482944B2
公开(公告)日：2022-10-25
申请号：US16007731
申请日：2018-06-13
发明人： Heping Dai
摘要： An apparatus having an AC rectifier configured to generate one or more rectified signals from an alternating current (AC) signal, bus having a positive line and a negative line, parallel converter connected between the positive line and the negative line, and bulk capacitor coupled to the parallel converter. The bus is connected to the AC rectifier to receive a first of the rectified signals between the positive line and the negative line. The apparatus has a controller configured to operate the parallel converter in a first mode in which energy from a second of the rectified signals from the AC rectifier is stored in the bulk capacitor and a second mode in which the energy stored in the bulk capacitor is discharged to the bus to increase a voltage on the bus during at least an initial portion of the second mode.
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公开(公告)号：US20230133307A1
公开(公告)日：2023-05-04
申请号：US18064816
申请日：2022-12-12
发明人： Yushan Li , Liming Ye , Heping Dai
摘要： An apparatus includes a controller configured to generate a PWM signal for controlling a power switch of a forward converter, a bias switch and a bias capacitor connected in series and coupled to a bias winding of the forward converter, and a comparator having a first input connected to the bias capacitor, a second input connected to a predetermined reference and an output configured to generate a signal for controlling the bias switch to allow a magnetizing current from the bias winding to charge the bias capacitor when a voltage across the bias capacitor is less than the predetermined reference.
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公开(公告)号：US20220376513A1
公开(公告)日：2022-11-24
申请号：US17880497
申请日：2022-08-03
发明人： Xiaolin Mao , Heping Dai , Huibin Zhu , Dianbo Fu
摘要： A direct current (DC) bus voltage from a combined output of a plurality of DC power modules is controlled based on an alternating current (AC) voltage of a power grid. The DC bus voltage tracks the AC grid voltage to provide efficient conversion between the DC power sources and the AC grid, even when the amplitude of the AC grid voltage varies. In one example, a variable reference voltage is generated based on a detected AC grid voltage. The reference voltage increases and decreases in proportion to increases and decreases in the AC grid voltage. In this manner, large differences between the bus voltage and the grid voltage are avoided. By closely tracking the two voltages, efficiency in the modulation index for power conversion can be achieved.
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公开(公告)号：US11342843B2
公开(公告)日：2022-05-24
申请号：US16825789
申请日：2020-03-20
发明人： Dianbo Fu , Heping Dai
摘要： An apparatus includes comprises an auxiliary switch, a transformer and an auxiliary diode. The auxiliary switch is configured to be turned on prior to turning on a first power switch of a multi-level boost converter. The transformer has a primary winding connected between the first power switch and the auxiliary switch. The auxiliary diode is coupled between a secondary winding of the transformer and an output terminal of the multi-level boost converter. The transformer and the auxiliary switch are configured such that the first power switch is of zero voltage switching, and the auxiliary switch is of zero current switching.
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公开(公告)号：US20220109373A1
公开(公告)日：2022-04-07
申请号：US17643471
申请日：2021-12-09
发明人： Dianbo Fu , Heping Dai , Liming Ye
摘要： A bidirectional power conversion system includes an isolated power converter having a first input connected to an output of a diode rectifier and a second input connected to an output of a power factor correction device. The power conversion system further comprises a plurality of switches and a plurality of diodes configured such that the plurality of switches and the plurality of diodes form the diode rectifier and the power factor correction device when the system is configured to deliver power from an AC power source to a DC load and the plurality of switches forms an inverter when the system is configured to deliver power from a DC power source to an AC load.
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公开(公告)号：US20220294347A1
公开(公告)日：2022-09-15
申请号：US17664467
申请日：2022-05-23
发明人： Dianbo Fu , Heping Dai
摘要： A multi-level converter includes a first blocking device, a second blocking device, a first switching element and a second switching element connected in series between an output terminal of the multi-level converter and ground, a first soft switching apparatus comprising a first auxiliary switch and a first transformer, wherein the first auxiliary switch and the first transformer are configured the first switching element is of zero voltage switching, and the first auxiliary switch is of zero current switching, and a second soft switching apparatus comprising a second auxiliary switch and a second transformer, wherein the second auxiliary switch and the second transformer are configured the second switching element is of zero voltage switching, and the second auxiliary switch is of zero current switching.
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