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JP-2026075051-A - Method and system for protecting wireless power transmission systems

JP2026075051AJP 2026075051 AJP2026075051 AJP 2026075051AJP-2026075051-A

Abstract

[Problem] To provide a wireless power transmission system. [Solution] The wireless power transmission system includes a first conversion unit configured to convert a first DC voltage of input power to a first AC voltage. Furthermore, the wireless power transmission system includes a non-contact power transmission unit configured to receive input power having a first AC voltage from the first conversion unit and transmit the input power. The wireless power transmission system also includes a second conversion unit configured to receive input power from the non-contact power transmission unit and convert the first AC voltage of the input power to a second DC voltage. Furthermore, the wireless power transmission system includes a switching unit configured to adjust the second DC voltage between the ends of an electrical load when the second DC voltage between the ends of the electrical load is greater than a voltage reference value. [Selection Diagram] Figure 1

Inventors

  • カピル・ジャ
  • プラディープ・ヴィジャヤン
  • ヤシュ・ヴィーアー・シン

Assignees

  • ドルビー インテレクチュアル プロパティ ライセンシング， エルエルシー

Dates

Publication Date
20260507
Application Date
20250919
Priority Date
20160203

Claims (20)

  1. A device for receiving wireless power from a first conversion unit, A secondary coil configured to receive wireless power from a primary coil associated with the first conversion unit, wherein the wireless power has an alternating current (AC) voltage, A second conversion unit comprising a first plurality of circuit elements configured to convert the wireless power into an output direct current (DC) voltage, A first transceiver configured to communicate a signal representing the output DC voltage, wherein the signal is configured to cause the first conversion unit to adjust the AC voltage of the wireless power based on the signal representing the output DC voltage, A switching unit electrically coupled to the second conversion unit, comprising a plurality of second circuit elements configured to adjust the output DC voltage based on the output DC voltage and a voltage reference value, Equipped with, Device.
  2. The apparatus according to claim 1, wherein the switching unit is configured to decouple the second conversion unit in order to protect one or more components of the apparatus.
  3. The apparatus according to claim 2, wherein, in order to decouple the second conversion unit, the switching unit is configured to start after the first transceiver communicates the signal representing the output DC voltage and decouple the second conversion unit within a period before the first conversion unit adjusts the wireless power.
  4. The apparatus according to claim 1, wherein the first transceiver is further configured to receive a reset signal, the reset signal being for reconnecting the second conversion unit to an electrical load.
  5. The apparatus according to claim 1, wherein the output DC voltage includes the output DC voltage across the terminals of an electrical load coupled to the second conversion unit, and the switching unit comprises a sensor electrically coupled to the electrical load and configured to determine the output DC voltage, and a controller electrically coupled to the sensor and the switch of the switching unit and configured to determine the duty cycle of a control signal configured to control the switch based on the output DC voltage.
  6. The apparatus according to claim 5, wherein the controller is configured to generate and supply to the switch the control signal having the duty cycle in order to adjust the wireless power supplied to the second conversion unit.
  7. The apparatus according to claim 5, wherein the controller is configured to determine the duty cycle of the control signal using a lookup table having a plurality of duty cycle values, and each of the plurality of duty cycle values corresponds to a different output DC voltage.
  8. The apparatus according to claim 5, wherein the first transceiver is configured to transmit the signal to the second transceiver of the first conversion unit.
  9. The apparatus according to claim 8, wherein the control unit of the first conversion unit is communicatively coupled to the second transceiver, and the control unit comprises a digital circuit configured to adjust the switching frequency of the first conversion unit based on the signal representing the output DC voltage across the electrical load.
  10. The apparatus according to claim 9, wherein the control unit is configured to adjust the switching frequency of the first conversion unit in order to adjust the output DC voltage.
  11. The apparatus according to claim 10, wherein the control unit is configured to adjust the output DC voltage after the controller has adjusted the output DC voltage.
  12. The apparatus according to claim 5, wherein the electrical load includes one or more batteries of a vehicle.
  13. The apparatus according to claim 1, wherein the first conversion unit is electrically coupled to a power supply that provides a first DC voltage, and the first conversion unit is configured to convert the first DC voltage to the AC voltage.
  14. The apparatus according to claim 1, wherein the switching unit configured to adjust the output DC voltage based on the output DC voltage and the voltage reference value includes a switching unit configured to adjust the output DC voltage when the output DC voltage is greater than the voltage reference value.
  15. A method for receiving wireless power from a first conversion unit, Receiving wireless power having a first alternating current (AC) voltage from a primary coil associated with the first conversion unit via a secondary coil, The second conversion unit converts the wireless power into an output DC voltage, The first transceiver communicates a signal representing the output DC voltage, wherein the signal is configured to cause the first conversion unit to adjust the first AC voltage of the wireless power based on the signal representing the output DC voltage. The switching unit adjusts the output DC voltage based on the output DC voltage and a voltage reference value, including, method.
  16. The method according to claim 15, further comprising decoupling the second conversion unit to protect one or more components of the second conversion unit.
  17. The method according to claim 15, further comprising the first transceiver receiving a reset signal from the second transceiver of the first conversion unit, wherein the reset signal is for reconnecting the second conversion unit to an electrical load.
  18. The method according to claim 15, wherein the output DC voltage includes the output DC voltage across the electrical load, and adjusting the output DC voltage includes determining the output DC voltage by a sensor and determining the duty cycle of a control signal configured to control the switches of the switching unit based on the output DC voltage by a controller.
  19. The method according to claim 18, wherein the control unit of the first conversion unit is configured to adjust the switching frequency of the first conversion unit based on the signal in order to adjust the output DC voltage.
  20. The method according to claim 19, wherein the switching frequency of the first conversion unit is adjusted after the control signal is supplied to the switch.

Description

Embodiments of the present invention generally relate to wireless power transmission systems, and more particularly to systems and methods for protecting wireless power transmission systems. In one or more industries, an electric vehicle or hybrid vehicle includes one or more batteries that supply power to drive the vehicle. For example, the batteries supply energy to an electric motor to drive the axles within the vehicle, thereby driving the vehicle. The batteries are used to supply power and therefore can be depleted and need to be charged from an external power source. Generally, power transmission systems are widely used to transmit power from a power source to one or more electrical loads, such as batteries in a vehicle. Typically, power transmission systems can be contact-based or contactless. In contact-based power transmission systems, components such as plugs, socket connectors, and wires are physically connected to the battery for charging. However, due to environmental influences, such connectors and wires can be damaged or corroded. Also, high currents and high voltages are used to charge the battery. Therefore, establishing a physical connection between the power source and the battery in the vehicle can involve cumbersome safety measures. Furthermore, this type of power transmission system can be bulkier and heavier compared to contactless power transmission systems. In contactless power transmission systems, a power converter is used to convert input power into transmittable power that can be further transmitted to an electrical load, such as a battery in a vehicle. The power converter includes switches that operate at a specific switching frequency to convert input power into transmittable power. Typically, depending on the load, the switching frequency of the power converter is changed to adjust or control the output voltage of the power transmission system. However, if the electrical load is disconnected or changed, the output voltage of the power transmission system can reach very high values in a very short time. Such a sudden increase in output voltage can lead to operational failure and may damage one or more components in the power transmission system. Therefore, improvements to systems and methods for protecting power transmission systems are needed. This is a configuration diagram showing a wireless power transmission system having a switching unit according to an embodiment of the present invention.This is a circuit diagram of a wireless power transmission system according to an embodiment of the present invention.This is a circuit diagram of a wireless power transmission system according to another embodiment of the present invention.This flowchart illustrates an example of a method for protecting a wireless power transmission system according to an embodiment of the present invention.This flowchart illustrates a method for decoupled and coupled conversion units in a wireless power transmission system according to an embodiment of the present invention.This flowchart illustrates a method for adjusting the output voltage of a wireless power transmission system according to an embodiment of the present invention. Various embodiments of systems and methods for protecting wireless power transmission systems are disclosed below, as described in detail. Also disclosed are various embodiments of systems and methods for regulating the output voltage of wireless power transmission systems. Specifically, the systems and methods disclosed herein employ a switching unit to protect one or more components within a wireless power transmission system. More specifically, the switching unit decouples one or more components in the system if the output voltage of the wireless power transmission system increases to an undesirable value. Furthermore, the switching unit can be used to control or regulate the output voltage of a wireless power transmission system even when the electrical load coupled to the wireless power transmission system changes significantly. Figure 1 is a schematic representation of a wireless power transmission system 100 according to an embodiment of the present invention. The wireless power transmission system 100 is used to transmit power from a power source 102 to one or more electrical loads 132, such as batteries, light loads, mobile devices like mobile phones, laptop computers, and HVAC systems. In particular, in the automotive industry, electric vehicles or hybrid vehicles include one or more batteries that supply power to drive the vehicle. Such batteries can be charged from the power source 102 via the wireless power transmission system 100. In one embodiment, the wireless power transmission system 100 may also be referred to as a contactless power transmission system. In the exemplary embodiment, the wireless power transmission system 100 includes a first conversion unit 104 (inverter), a control unit 106, a contactless power transmission unit 108, and a second convers