-
公开(公告)号：US20170373537A1
公开(公告)日：2017-12-28
申请号：US15611622
申请日：2017-06-01
Applicant: Apple Inc.
Inventor： Rohan Dayal , Weihong Qiu , Zaki Moussaoui
IPC: H02J50/10 , H04B1/3827 , H02J7/02
CPC classification number: H02J50/10 , H02J7/025 , H02J50/80 , H04B1/3827
Abstract: A wireless power transmitting device may have control circuitry that supplies drive signals to a coil to produce wireless power signals. The wireless power receiving device may have a coil that receives the transmitted wireless power signals from the wireless power transmitting device. The wireless power receiving device may have a rectifier that rectifies signals received by the coil in the wireless power receiving device and that provides a rectified voltage to a capacitor. A charger in the wireless power receiving device may charge a battery in the device using the rectified voltage. When it is desired to convey information to the wireless power transmitting device, the wireless power transmitting device may cease the transmission of wireless power and the wireless power receiving device may modulate transistors in the rectifier to transmit data to the wireless power transmitting device.
-
公开(公告)号：US10923955B2
公开(公告)日：2021-02-16
申请号：US15868877
申请日：2018-01-11
Applicant: Apple Inc.
Inventor： Nan Liu , Rohan Dayal , Weihong Qiu , Zaki Moussaoui
Abstract: A wireless power system may use a wireless power transmitting device to transmit wireless power to a wireless power receiving device. The wireless power transmitting device may have an array of coils that extend under a wireless charging surface. Control circuitry may supply alternating-current control signals to inverters. The inverters are coupled to resonant circuits. Each resonant circuit includes a capacitor coupled to a respective one of the coils. During operation, wireless power signals are transmitted from the coils to the wireless power receiving device through the charging surface. The capacitor associated with each resonant circuit may potentially be individually selected to enhanced uniformity of the wireless power transmitting device. The array of coils may have multiple layers and the capacitors in each layer may have different respective values.
-
公开(公告)号：US20210021158A1
公开(公告)日：2021-01-21
申请号：US16983866
申请日：2020-08-03
Applicant: Apple Inc.
Inventor： Weihong Qiu , Zaki Moussaoui , Rohan Dayal
Abstract: A transmitter device is configured to transfer energy to multiple receiver devices. The transmitter device includes multiple transmitter coils, and a shared power converter is coupled to each transmitter coil. The shared power converter includes a leading half bridge and multiple trailing half bridges. Each transmitter coil is coupled between the leading half bridge and a respective one of the trailing half bridges. The shared power converter is dynamically configurable in that the leading half bridge may be coupled to multiple trailing half bridges when energy is to be transferred wirelessly to two or more receiver devices. The leading half bridge simultaneously operates with each trailing half bridge as an independent full-bridge phase shift inverter. A signal supplied to each transmitter coil is independently regulated by controlling a phase shift of a respective trailing half bridge with respect to the leading half bridge.
-
公开(公告)号：US10523063B2
公开(公告)日：2019-12-31
申请号：US15829850
申请日：2017-12-01
Applicant: Apple Inc.
Inventor： Weihong Qiu , Rohan Dayal , Zaki Moussaoui
Abstract: Disclosed are devices, systems, and methods for reducing common mode noise induced in wireless charging circuits of electronic devices. For an electronic device having an inductive receiving coil near an electric shielding layer, differences in parasitic capacitances of the loops of the inductive receiving coil with an electric shielding layer can induce common mode noise. Common mode noise is reduced by a noise-reduction capacitor from the inductive receiving coil to the electric shielding layer together with a grounding resistor from the electric shielding layer to a common ground of the wireless charging circuit.
-
公开(公告)号：US10389274B2
公开(公告)日：2019-08-20
申请号：US15829610
申请日：2017-12-01
Applicant: Apple Inc.
Inventor： Weihong Qiu , Rohan Dayal , Zaki Moussaoui
Abstract: A power converter can be implemented with a boosted-output inverter, which integrates the functionality of a voltage converter (e.g., boost converter) and a voltage inverter. In particular, a boosted-output inverter includes a primary tank inductor coupled in series with a secondary tank inductor at a central node. The boosted-output inverter also includes two voltage-controlled switches that respectively define a charging phase and a discharging phase of the primary tank inductor. While the primary tank inductor is charging, the secondary tank inductor is inverted to ground. In this manner, current though the secondary tank inductor alternates at a voltage boosted by the fly-back voltage of the primary tank inductor exhibited when the primary tank inductor transitions from the charging mode to the discharging mode. In many cases, the secondary tank inductor is a transmit coil of a transmitter of a wireless power transfer system.
-
Patent Agency Ranking
公开(公告)号：US20180219405A1
公开(公告)日：2018-08-02
申请号：US15884199
申请日：2018-01-30
Applicant: Apple Inc.
Inventor： Weihong Qiu , Rohan Dayal , Zaki Moussaoui
CPC classification number: H02J7/025 , H02J50/12 , H02J50/40 , H04B5/0037 , H04B5/0075
Abstract: A wireless power transmitting device transmits wireless power signals to a wireless power receiving device by supplying drive signals with a duty cycle to a wireless power transmitting coil. The wireless power receiving device has a rectifier and a wireless power receiving coil that receives wireless power signals having the duty cycle from the wireless power transmitting device. The rectifier is coupled to an integrated circuit such as a battery charger integrated circuit. The amount of current drawn by the integrated circuit from the rectifier is adjustable. During operation, control circuitry in the wireless power receiving device sets the current to multiple different values while using sensor circuitry to measure output power from the rectifier. A satisfactory value for the duty cycle can be identified by adjusting the duty cycle while observing when peaks in the output power arise as a function of the different current values.
-
公开(公告)号：US20170093269A1
公开(公告)日：2017-03-30
申请号：US15064501
申请日：2016-03-08
Applicant: Apple Inc.
Inventor： Weihong Qiu , Rohan Dayal , Zaki Moussaoui
IPC: H02M1/08
CPC classification number: H02M1/083 , H02M3/33569 , H02M3/3376 , H02M2001/0032 , H02M2001/0058 , Y02B70/1491 , Y02B70/16
Abstract: This disclosure relates to improved designs for phase-shift power converters, and, in particular, full bridge converters. Phase-shift power converters may lose Zero-Voltage-Switching (ZVS) under some load conditions, e.g., light load conditions—which can result in large switching losses. In order to avoid these losses, additional LC tank circuits may be added into the system to generate an amount of negative current needed to maintain ZVS. However, permanently adding such LC tank circuits into the system will reduce the system's efficiency. By intelligently adjusting the number (and particular combination) of LC tank circuits included in the system at a given time, ZVS may be maintained under all load conditions, while the impact of the additional LC tank circuits on the converter's overall efficiency may be limited, e.g., by employing the minimum number of LC tank circuits for the minimum amount of time needed to maintain ZVS.
-
公开(公告)号：US12230980B1
公开(公告)日：2025-02-18
申请号：US17448155
申请日：2021-09-20
Applicant: Apple Inc.
Inventor： Ye Li , Gianpaolo Lisi , Bingyao Sun , Liang Chen , Gaurav Kalra , Rohan Dayal , Stephen C. Terry
Abstract: A wireless power system can include a wireless power transmitter and a wireless power receiver. The transmitter can include a transmit coil, an inverter, and inverter control circuitry that can operate one or more switching devices of the inverter to communicate information to the receiver by controlling a delay between receipt of the burst request pulse and initiating operation of the inverter and/or controlling a polarity of a first pulse of the inverter. The receiver can include a receive coil magnetically coupled to the transmit coil, a rectifier, and rectifier control circuitry that initiates a burst request pulse to initiate operation of a transmitter. The rectifier control circuitry can operate one or more switching devices of the rectifier to communicate information to the transmitter by at least one of short circuiting an LC tank including the receive coil or controlling a polarity of the burst request pulse.
-
公开(公告)号：US11979030B2
公开(公告)日：2024-05-07
申请号：US16983866
申请日：2020-08-03
Applicant: Apple Inc.
Inventor： Weihong Qiu , Zaki Moussaoui , Rohan Dayal
CPC classification number: H02J50/12 , H02J50/402
Abstract: A transmitter device is configured to transfer energy to multiple receiver devices. The transmitter device includes multiple transmitter coils, and a shared power converter is coupled to each transmitter coil. The shared power converter includes a leading half bridge and multiple trailing half bridges. Each transmitter coil is coupled between the leading half bridge and a respective one of the trailing half bridges. The shared power converter is dynamically configurable in that the leading half bridge may be coupled to multiple trailing half bridges when energy is to be transferred wirelessly to two or more receiver devices. The leading half bridge simultaneously operates with each trailing half bridge as an independent full-bridge phase shift inverter. A signal supplied to each transmitter coil is independently regulated by controlling a phase shift of a respective trailing half bridge with respect to the leading half bridge.
-
公开(公告)号：US11756719B2
公开(公告)日：2023-09-12
申请号：US17484954
申请日：2021-09-24
Applicant: Apple Inc.
Inventor： Narendra S. Mehta , Stephen C. Terry , Rohan Dayal
CPC classification number: H01F27/28 , H01F38/14 , H01M10/425 , H02J50/005 , H02J50/10 , H02J50/12 , H02J50/502 , H02J50/40
Abstract: A battery case has first and second coils on opposing sides of a battery and has switching circuitry that is coupled between the first and second coils. The battery case has a battery that provides supplemental battery power wirelessly to a wireless power receiving device via the second coil when the switching circuitry is in an open state. The case can also receive power wirelessly with the first coil from a wireless charging mat when the switching circuitry is in the open state. In a closed state, the switching circuitry shorts the first and second coils together so that current flowing through the first coil flows through the second coil in series and so that wireless power from the wireless charging mat that is received with the first coil is transmitted wirelessly to the wireless power receiving device using the second coil.
-
-
-
-
-
-
-
-
-
Search Results
29
records
(took 0.018 seconds)
