Photonic DC Voltage Conversion Without Inductors or Switching Noise

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Solution Overview

Problem

Existing DC voltage conversion technologies face challenges in miniaturization due to the size of inductors and switching noise, which leads to electromagnetic interference and reduced electromagnetic compatibility, making it difficult to achieve efficient voltage conversion in compact electronic devices.

Innovation Solution

The use of photonic transformers based on light-emitting diodes (LEDs) and photo-voltaic cells with index-matched optical coupling, eliminating the need for switching components and energy storage elements, allowing for efficient DC voltage conversion through photon-emission and reabsorption processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If switch-mode converters are used for DC voltage conversion, then voltage conversion capability is achieved, but device area increases due to inductors and capacitors

Engineering Contradiction:
Improvevoltage conversion capabilityVSAvoiddevice area
Core Design Contradiction:
PowerVSArea of stationary object

Solution Approach 1:

The patent replaces the traditional electromagnetic inductor-based energy storage mechanism with a photonic energy storage mechanism using photons confined in an optical cavity. This substitution eliminates the need for bulky inductors and capacitors, achieving voltage conversion through optical field energy storage rather than electromagnetic field storage, thereby dramatically reducing device area while maintaining power conversion capability

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental operating parameters from electrical domain (current, voltage, electromagnetic frequency) to optical domain (photon energy, optical frequency, cavity resonance). By operating at optical frequencies rather than electrical switching frequencies, the system achieves energy storage and voltage conversion without requiring large inductors and capacitors, thus reducing device footprint

Inventive Principle:
Principle #35Parameter changes

2Power

If switching components are used for DC voltage conversion, then voltage level adjustment is achieved, but electromagnetic interference increases

Engineering Contradiction:
Improvevoltage level adjustmentVSAvoidelectromagnetic interference
Core Design Contradiction:
PowerVSObject-generated harmful factors

Solution Approach 1:

The patent substitutes electrical switching components with photonic components. Instead of using transistors and diodes that generate electromagnetic interference during switching, the system uses optical modulators and photodetectors that operate in the optical domain. This eliminates the harmful electromagnetic radiation associated with high-speed electrical switching while maintaining voltage level adjustment capability through optical signal modulation

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces optical fields as an intermediary between input and output electrical circuits. Electrical signals are converted to optical signals, processed through the optical cavity, and then converted back to electrical signals. This optical intermediary isolates the input and output electrical circuits, preventing direct electromagnetic interference while enabling voltage conversion through the optical domain

Inventive Principle:
Principle #24Intermediary (Mediator)

3Area of stationary object

If inductors are scaled down for miniaturization, then device area decreases, but conversion efficiency deteriorates

Engineering Contradiction:
Improvedevice areaVSAvoidconversion efficiency
Core Design Contradiction:
Area of stationary objectVSLoss of energy

Solution Approach 1:

The patent changes the operating frequency parameter from electrical frequencies (typically kHz to MHz range) to optical frequencies (hundreds of THz range). This parameter change allows the use of photonic components with extremely small dimensions while maintaining high Q-factor energy storage. The optical cavity can store energy efficiently at these frequencies without requiring large physical dimensions, thus achieving miniaturization without efficiency loss

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent replaces electromagnetic inductors with photonic crystal cavities or optical resonators. These photonic structures achieve energy storage through optical confinement rather than magnetic field storage, allowing for dramatically reduced size while maintaining or improving energy storage efficiency. The photonic components can achieve higher Q-factors in smaller volumes compared to traditional inductors

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

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 approach enables high-efficiency DC voltage conversion with near-unity conversion efficiency and reduced noise, overcoming the limitations of traditional switch-mode converters by achieving compact, high-performance DC power converters with improved electromagnetic compatibility.

Implementation Method 1

a light-emitting diode (LED) and a photodetector, with an optical medium between the LED and the photodetector

Methodology Applied
Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

a light-emitting diode (LED) and a photodetector

Methodology Applied
Scientific EffectPhotovoltaic effect: Photovoltaic Effect

Data Source

PatentUS11923873B2Apparatuses and methods involving DC voltage conversion using photonic transformers
Publication Date: 2024.03.05 THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
  • US11923873B2 patent drawing
  • US11923873B2 patent drawing
  • US11923873B2 patent drawing

AI summary

In certain examples, methods and semiconductor structures are directed to an apparatus including a photon emitter such as an LED which operates over an emission wavelength range and a photo-voltaic device arranged relative to the photon emitter to provide index-matched optical coupling between the photo-voltaic device and the photon emitter for an emission wavelength range of the photon emitter.