Wireless Power Control Circuit for Ripple Reduction

Solution Overview

Problem

Existing wireless power transmission devices face inefficiencies and increased volume and power loss due to the need for additional electronic components to reduce output ripple, which affects their performance.

Innovation Solution

A control circuit and method that includes a transmitter detecting unit, a first control unit, and a driver unit to adjust the input power of the transmitter unit by comparing it with a reference signal, thereby adjusting the output ripple or magnitude of the receiver unit without requiring additional components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a filter circuit comprising a capacitor and/or an inductor is located at a transmitting side or receiving side to reduce output ripple, then the output ripple is reduced, but the volume and power loss of the wireless power transmission device increase

Engineering Contradiction:

Improveoutput rippleVSAvoidpower loss

Core Design Contradiction:

Object-affected harmful factorsVSLoss of energy

Solution Approach 1:

The patent replaces the traditional mechanical/electronic filter circuit (comprising capacitors and inductors) with a control circuit that uses signal processing and switching control to achieve ripple reduction. The control circuit includes a detecting unit that monitors output voltage, a control unit that generates control signals based on detected ripple, and a switching device that adjusts power transmission accordingly, eliminating the need for bulky passive filter components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operating parameters of the wireless power transmission device dynamically by adjusting the switching duty cycle and frequency based on detected output ripple characteristics. The control unit modifies these parameters in real-time to suppress ripple without requiring additional energy-dissipating components.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If a filter circuit comprising a capacitor and/or an inductor is located at a transmitting side or receiving side to reduce output ripple, then the output ripple is reduced, but the volume of the wireless power transmission device increases

Engineering Contradiction:

Improveoutput rippleVSAvoidvolume

Core Design Contradiction:

Object-affected harmful factorsVSVolume of moving object

Solution Approach 1:

The patent replaces the traditional mechanical/electronic filter circuit (comprising capacitors and inductors) with a control circuit that uses signal processing and switching control to achieve ripple reduction. The control circuit includes a detecting unit that monitors output voltage, a control unit that generates control signals based on detected ripple, and a switching device that adjusts power transmission accordingly, eliminating the need for bulky passive filter components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts and removes the unnecessary filter circuit components (capacitors and inductors) from the system, keeping only the essential control elements (detecting unit, control unit, and switching device) that can achieve ripple reduction through active control rather than passive filtering.

Inventive Principle:

Principle #2Taking out (Extraction)

3Object-affected harmful factors

If additional electronic components are installed in the wireless power transmission device to reduce output ripple, then the output ripple is reduced, but the efficiency of the wireless power transmission device decreases

Engineering Contradiction:

Improveoutput rippleVSAvoidefficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent replaces the traditional mechanical/electronic filter circuit (comprising capacitors and inductors) with a control circuit that uses signal processing and switching control to achieve ripple reduction. The control circuit includes a detecting unit that monitors output voltage, a control unit that generates control signals based on detected ripple, and a switching device that adjusts power transmission accordingly, eliminating the need for bulky passive filter components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The wireless power transmission device performs self-regulation of output ripple through its own control circuit without requiring external or additional energy-consuming components. The detecting unit monitors the device's own output, and the control unit automatically adjusts the switching device to suppress ripple, making the system self-correcting and energy-efficient.

Inventive Principle:

Principle #25Self-service

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 solution improves the efficiency of wireless power transmission by directly adjusting the input power to control output ripple, reducing the need for additional components and minimizing volume and power loss, allowing for effective management of dynamic and steady-state performance.

Implementation Method 1

a transmitter detecting unit, configured to obtain an input power of the transmitter unit and generate an input power signal

Methodology Applied

Scientific EffectPower detection:

Implementation Method 2

a first control unit, configured to generate a control signal according to a result of comparing the input power signal with a reference input power signal

Methodology Applied

Scientific EffectSignal comparison:

Implementation Method 3

a driver unit, configured to drive switching devices of the transmitter unit according to the control signal

Methodology Applied

Scientific EffectSwitching control:

Implementation Method 4

The wireless power transmission device includes a transmitter unit and a receiver unit

Methodology Applied

Scientific EffectWireless power transmission: Electromagnetic Induction

Data Source

PatentUS10797521B2Control circuit and control method for wireless power transmission device

Publication Date: 2020.10.06 DELTA ELECTRONICS (THAILAND) PUBLIC CO LTD

AI summary

A control circuit for a wireless power transmission device is provided. The wireless power transmission device includes a transmitter unit and a receiver unit. The control circuit includes a transmitter detecting unit, a first control unit and a driver unit. The transmitter detecting unit obtains an input power of the transmitter unit and generates an input power signal. The first control unit generates a control signal according to a result of comparing the input power signal with a reference input power signal. The driver unit drives switching devices of the transmitter unit according to the control signal. Consequently, the input power of the transmitter unit is adjusted, and an output ripple or a magnitude of the output of the receiver unit is adjusted.