Oscillating Driver Circuit for Low-Voltage Energy Extraction
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Solution Overview
Problem
Conventional driver circuits are ineffective in utilizing low-powered or nearly depleted energy sources to power devices like LEDs and charge batteries, as they require a sufficient voltage to operate efficiently.
Innovation Solution
A driver circuit configuration that includes a transformer and a bipolar junction transistor (BJT) to induce voltage and current oscillations, stepping up low DC voltage to higher voltage pulses, allowing energy extraction and charging even from single-cell or nearly depleted batteries, with the LED or load connected in parallel with the transformer winding to facilitate energy feedback and efficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional driver circuits are used, then they can operate with sufficient voltage, but they cannot effectively utilize low-powered or nearly depleted energy sources
Solution Approach 1:
The circuit employs a BJT transistor that dynamically switches between ON and OFF states to generate oscillations in the transformer windings. This dynamic operation enables the circuit to extract energy from low-powered sources by creating alternating current flow that induces voltage through electromagnetic induction, overcoming the static voltage limitation of conventional circuits.
Solution Approach 2:
The circuit generates periodic oscillations through the transistor switching and transformer inductance, creating repeated cycles of energy transfer. This periodic action allows cumulative energy extraction from the low-powered source over time, enabling effective charging of batteries and powering of loads even when instantaneous voltage is insufficient.
2Power
If a transformer and BJT are used to generate voltage oscillations, then low DC voltage can be stepped up to higher voltage pulses, but the circuit complexity increases
Solution Approach 1:
The transformer serves multiple functions: it steps up voltage from the low-powered source, provides electromagnetic coupling for energy transfer, and enables oscillation generation through its inductance. The BJT transistor similarly performs multiple roles including switching, amplification, and oscillation control. This multi-functionality reduces the need for additional dedicated components.
Solution Approach 2:
The circuit is self-oscillating, meaning the transformer and BJT automatically generate and sustain oscillations without requiring an external clock or control signal. The feedback through the transformer windings and transistor creates a self-regulating system that automatically adjusts its operation based on the input energy availability.
3Productivity
If the LED or load is connected in parallel with the transformer winding, then energy feedback is facilitated and charging efficiency is improved, but the circuit configuration becomes more complex than traditional joule thief circuits
Solution Approach 1:
The parallel connection of the LED or load with the transformer winding creates a feedback path where the load current influences the oscillation dynamics. This feedback mechanism optimizes energy transfer by allowing the load to participate in the oscillation cycle, improving charging efficiency by ensuring energy is transferred during the optimal phases of the oscillation.
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 configuration enables the use of low-powered DC voltage sources to provide high output voltage, extends battery longevity by feeding energy back into the circuit, reduces voltage spikes, and allows charging of various devices like LEDs, motors, and batteries, improving overall circuit efficiency and safety.
Implementation Method 1
The DC current travels between the primary and secondary winding to induce an electromagnetic field (EMF) in both windings of the transformer
Implementation Method 2
The DC voltage source provides a DC current to the transformer windings as the BJT switches between ON and OFF modes. The DC current travels between the primary and secondary winding to induce an electromagnetic field (EMF) in both windings of the transformer
Implementation Method 3
As the BJT switches to the OFF mode, the device provides an output voltage to a load as a result of the induced EMF in the transformer windings
Data Source
AI summary
In some implementations, a device includes terminals to couple with a battery arranged to supply power to the device. The device includes a first winding and a second winding that are arranged to be inductively coupled. The device includes a transistor. The first winding and the second winding are coupled to the positive terminal with opposite polarity. The device includes a light emitting diode (LED). The device is arranged to couple the LED being coupled in parallel with the second winding. The LED is arranged to be reverse biased with respect to the battery.