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公开(公告)号：WO2021154968A1
公开(公告)日：2021-08-05
申请号：PCT/US2021/015452
申请日：2021-01-28
Applicant: WITRICITY CORPORATION
Inventor： ROCHFORD, Conor , DANILOVIC, Milisav
Abstract: The disclosure features circuits and methods for protecting transistors of a wireless power receiver, which can be controlled by gate drivers powered by an auxiliary power source. The circuit can include a comparator configured to generate a signal indicating a comparison of a value of the auxiliary power source to a predetermined threshold, and a fault latch coupled to the comparator. The fault latch can be configured to trigger based on the generated signal and transmit a signal to respective inputs of the gate drivers to cause a latched-on state of respective gates of the transistors. Switches respectively coupled to the gate drivers can be configured to disconnect respective outputs of the gate drivers from the respective transistor gates. Gate hold-up circuits respectively coupled to the respective transistor gates can be configured to maintain the latched-on state of the respective transistor gates for a period of time.
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公开(公告)号：WO2021041574A1
公开(公告)日：2021-03-04
申请号：PCT/US2020/048046
申请日：2020-08-26
Applicant: WITRICITY CORPORATION
Inventor： DANILOVIC, Milisav
Abstract: Described herein are active rectification methods and systems for a rectifier of a wireless power system. Exemplary methods can include detecting, by a zero-crossing detector, one or more zero-crossings of a current at an input of the rectifier and determining a first delay time based on at least one wireless power system parameter and the zero-crossings. The methods can include generating first and second control signals for first and second switches of the rectifier, respectively, based on the first delay time; inserting a first dead time between the first control signal and the second control signal; and providing the first and second control signals to the first and second switches, respectively.
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公开(公告)号：WO2020092934A1
公开(公告)日：2020-05-07
申请号：PCT/US2019/059441
申请日：2019-11-01
Applicant: WITRICITY CORPORATION
Inventor： ROCHFORD, Conor , DANILOVIC, Milisav
Abstract: Disclosed herein are systems and methods for determining a current of a resonator coil during operation of a wireless power system having the resonator coil, in which the resonator coil is coupled to a fixed capacitive network and a reactance circuit. The systems and methods can include determining a first signal which can include receiving a current in an inductor of the reactance circuit; converting the current to a voltage signal; and scaling the voltage signal. The systems and methods can include determining a second signal which can include receiving an output voltage at an output of the reactance circuit; dividing the output voltage; and integrating the divided scaled voltage to produce an inverted differentiated voltage signal. The methods can include summing the first signal and the second signal to produce a summed signal; and determining the current in the resonator coil based on the summed signal.
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公开(公告)号：WO2019006376A1
公开(公告)日：2019-01-03
申请号：PCT/US2018/040411
申请日：2018-06-29
Applicant: WITRICITY CORPORATION
Inventor： DANILOVIC, Milisav , ESTEBAN, Bryan Ashworth , YEUNG, Kinjeo
Abstract: Methods, systems, and devices for protecting a wireless power transfer system. One aspect features a sensor network for a wireless power transfer system. The sensor network includes a differential voltage sensing circuit and a current sensing circuit. The differential voltage sensing circuit is arranged within a wireless power transfer system to measure a rate of change of a voltage difference between portions of an impedance matching network and generate a first signal representing the rate of change of the voltage difference. The current sensing circuit is coupled to the differential voltage sensing circuit and configured to calculate, based on the first signal, a current through a resonator coil coupled to the wireless power transfer system.
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Patent Agency Ranking
公开(公告)号：WO2018039486A1
公开(公告)日：2018-03-01
申请号：PCT/US2017/048481
申请日：2017-08-24
Applicant: WITRICITY CORPORATION
Inventor： DANILOVIC, Milisav , KURS, Andre, B.
Abstract: A wireless power receiver (300) is coupled to an impedance matching network (C3A', C3A'', C3B', C3B''), the impedance matching network having a first output node (N3) and a second output node (N4). Coupled to the first output node (N3) is a first branch having a component (L4A, C4A) with a first positive reactance (X4A) and a second branch having a component (L4B, C4B) with a first negative reactance (X4B), wherein an absolute value of the first positive reactance (X4A) is different from an absolute value of the first negative reactance (X4B), and coupled to the second output node (N4) is a third branch having a component (L4C, C4C) with a second positive reactance (X4C) and a fourth branch having a component (L4D, C4D) with a second negative reactance (X4D), wherein an absolute value of the second positive reactance (X4C) is different from an absolute value of the second negative reactance (X4D).
Abstract translation: 无线功率接收器（300）耦合到阻抗匹配网络（C3A'，C3A“，C3B'，C3B”），所述阻抗匹配网络具有第一输出节点（N3） 和第二输出节点（N4）。 耦合到第一输出节点（N3）的是具有具有第一正电抗（X4A）的分量（L4A，C4A）和具有具有第一负电抗（X4B）的分量（L4B，C4B）的第二分支的第一分支， 其中第一正电抗（X4A）的绝对值不同于第一负电抗（X4B）的绝对值，并且耦合到第二输出节点（N4）的是具有分量（L4C，C4C）的第三分支，其中 第二正电抗（X4C）和具有第二负电抗（X4D）的分量（L4D，C4D）的第四分支，其中第二正电抗（X4C）的绝对值不同于第二负 电抗（X4D）。
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公开(公告)号：WO2017139406A1
公开(公告)日：2017-08-17
申请号：PCT/US2017/017054
申请日：2017-02-08
Applicant: WITRICITY CORPORATION
Inventor： DANILOVIC, Milisav
CPC classification number: H02J50/12 , B60L11/182 , H03H7/40 , H03H11/28 , H03K5/1536 , H03K7/08 , H03K17/284
Abstract: Methods, systems, and devices for controlling a variable capacitor. One aspect features a variable capacitance device that includes a capacitor, a first transistor, a second transistor, and control circuitry. The control circuitry is configured to adjust an effective capacitance of the capacitor by performing operations including detecting a zero-crossing of an input current at a first time. Switching off the first transistor. Estimating a first delay period for switching the first transistor on when a voltage across the capacitor is zero. Switching on the first transistor after the first delay period from the first time. Detecting a zero-crossing of the input current at a second time. Switching off the second transistor. Estimating a second delay period for switching the second transistor on when a voltage across the capacitor is zero. Switching on the second transistor after the second delay period from the second time.
Abstract translation:
用于控制可变电容器的方法，系统和设备。 一个方面的特征在于包括电容器，第一晶体管，第二晶体管和控制电路的可变电容器件。 控制电路被配置为通过执行包括检测第一时间的输入电流的零交叉的操作来调整电容器的有效电容。 关闭第一个晶体管。 当电容器两端的电压为零时，估算用于接通第一晶体管的第一延迟周期。 从第一次开始在第一延迟时间段之后接通第一晶体管。 第二次检测输入电流的过零点。 关闭第二个晶体管。 当电容器两端的电压为零时，估计用于接通第二晶体管的第二延迟时段。 从第二次开始在第二延迟时间段之后接通第二晶体管。
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公开(公告)号：WO2021178894A1
公开(公告)日：2021-09-10
申请号：PCT/US2021/021209
申请日：2021-03-05
Applicant: WITRICITY CORPORATION
Inventor： DANILOVIC, Milisav , ROCHFORD, Conor
Abstract: Disclosed herein are methods and systems for controlling an active rectifier of a wireless power receiver. The exemplary methods can include determining a reference value of a current into the rectifier, the reference value being based on a load requirement; determining a required value change in a present input current into the rectifier based on the reference value; transmitting, to a wireless power transmitter, a signal representative of the required value change in the present input current; determining a new value of the present input current after transmitting the signal; and, when the new value is within a predetermined range of the required value change, driving at least one transistor in the rectifier with a PWM signal based on the new value.
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公开(公告)号：WO2020242990A1
公开(公告)日：2020-12-03
申请号：PCT/US2020/034344
申请日：2020-05-22
Applicant: WITRICITY CORPORATION
Inventor： DANILOVIC, Milisav , KESLER, Morris, P. , ROCHFORD, Conor
IPC: H02J50/12
Abstract: Exemplary protection circuitry for wireless power systems can include a battery disconnect circuit, a load dump protection circuit, and/or a coil disconnect circuit. One or more of these protection circuits may be employed by a wireless power receiver. Further, one or more of these protection circuits may enable a wireless power receiver to be able to protect itself independently from a wireless power transmitter, thereby increasing safety of the wireless power system.
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公开(公告)号：WO2020113007A1
公开(公告)日：2020-06-04
申请号：PCT/US2019/063616
申请日：2019-11-27
Applicant: WITRICITY CORPORATION
Inventor： ESTEBAN, Bryan , DANILOVIC, Milisav , SEALY, Kylee, Devro
IPC: H02J50/12
Abstract: Disclosed herein are systems and methods for low power excitation of wireless power transmitters configured to transmit high power. The exemplary systems and methods include disabling a power factor correction circuit of the transmitter, and adjusting one or more variable impedance components of the impedance network to obtain a minimum attainable impedance. The variable impedance components can be configured to operate between the minimum attainable impedance and a maximum attainable impedance. The systems and methods can include adjusting a phase shift angle associated with one or more transistors of the inverter and driving the transmitter such that the transmitter resonator coil generates a magnetic flux density less than or equal to a field safety threshold.
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