Wireless Power Receiver Rectifier Without Isolated Gate Driver
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Solution Overview
Problem
Current wireless power receivers require complex gate driver circuits, limiting downsizing and increasing production costs due to the need for multiple elements in the circuit.
Innovation Solution
A wireless power receiver design that includes a bidirectional switch with sources connected to ground, eliminating the need for an isolated gate driver circuit by using a driver circuit connected to the gates of MOSFETs, allowing for efficient switching between on and off states to receive and rectify wireless power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an isolated gate driver circuit is used to control MOSFETs in wireless power receivers, then reliable switching control is achieved, but device size increases and production cost rises
Solution Approach 1:
The patent extracts the gate driver circuit from the wireless power receiver system entirely. Instead of including a separate isolated gate driver circuit, the invention uses the existing resonant circuit to generate gate drive signals that directly control the MOSFETs. This removal of the isolated gate driver circuit reduces device complexity and production cost while maintaining switching control reliability through the resonant circuit's inherent signal generation capability.
2Adaptability or versatility
If multiple elements are included in the wireless power receiver circuit, then functional requirements are met, but downsizing is limited
Solution Approach 1:
The patent makes the resonant circuit serve multiple functions simultaneously. It not only receives wireless power through electromagnetic resonance but also generates the gate drive signals needed to control the MOSFETs. By making the resonant circuit multi-functional, the design eliminates the need for separate dedicated gate driver circuits, thereby reducing overall receiver size while maintaining all necessary functional capabilities.
3Ease of operation
If a complex gate driver circuit is implemented, then precise MOSFET control is achieved, but production cost increases
Solution Approach 1:
The patent implements a self-service mechanism where the resonant circuit automatically generates the gate drive signals it needs to control the MOSFETs. The resonant circuit's oscillating voltage naturally provides the switching signals, eliminating the need for complex external gate driver circuits. This self-service approach maintains precise MOSFET control while significantly reducing production cost by removing additional circuit components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables the production of wireless power receivers with reduced size and lower production costs, as it simplifies the circuitry and eliminates the requirement for a complex gate driver circuit.
Implementation Method 1
Wireless charging technology that uses an electromagnetic induction scheme or a magnetic resonance scheme has been utilized on electronic devices such as smart phones. When a power transmitting unit (PTU) (e.g., a wireless charging pad) and a power receiving unit (PRU) (e.g., a smart phone) come into contact with each other or approach each other within a certain distance, a battery of the PRU may be charged by electromagnetic induction or electromagnetic resonance between a transmitting coil of the PTU and a receiving coil of the PRU.
Implementation Method 2
The bidirectional switch 120 may include two or more switches (e.g., a first switch 121 and a second switch 122). Each of the first switch 121 and the second switch 122 may be an N-channel metal-oxide semiconductor field-effect-transistor (MOSFET)... When the gate voltage is applied to the gate of each of the first switch 121 and the second switch 122, the first switch 121 and the second switch 122 may be switched to an 'on' state and both ends of the bidirectional switch 120 may be electrically connected.
Implementation Method 3
The first rectifier circuit 130 may include a third diode 131, a fourth diode 132, and/or a capacitor 133. When the first and switch 121 and the second switch 122 are switched from the 'on' state to the 'off' state, upon application of a voltage of a predetermined magnitude or greater to the both ends of the first switch 121 and the second switch 122, the third diode 131 and the fourth diode 132 may operate to rectify an induced voltage, and thus, apply the rectified voltage as a both-end voltage of the capacitor 133.
Data Source
AI summary
A wireless power receiver receiving power from a wireless power transmitter is provided. The receiver includes a resonance circuit, a rectifier circuit, and a driver circuit. The resonance circuit includes first and second coils and a first capacitor. The rectifier circuit includes first and second rectifier circuits. The first rectifier circuit includes first through fourth MOSFETs. Sources of the first and second MOSFETs are connected to ends of a resonator including the first coil and the first capacitor. Sources of the third and fourth MOSFETs are connected to ground. The driver circuit is connected to gates of the first through fourth MOSFETs, When the driver circuit switches off the first and second MOSFETs and switches on the third and fourth MOSFETs, as currents are induced in the resonator and the second coil, the resonance circuit receives the wireless power, and the current induced in the second coil is rectified by the second rectifier circuit.