Resonant Circuit Stabilizes Load Voltage Without Feedback
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Solution Overview
Problem
Existing methods for stabilizing load voltage in movable devices relative to a stator, such as in computer tomographs, face inefficiencies due to high losses from parasitic elements like stray inductance in magnetic coupling and require complex feedback systems, which can be slow and unreliable.
Innovation Solution
A circuit using a resonant circuit with a capacitance and primary winding of a transformer, where the frequency of the transmission voltage is adjusted to maintain a constant transmission ratio independent of the load, allowing for load voltage stabilization without the need for feedback, thereby simplifying the system and reducing susceptibility to faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If magnetic coupling is used to transmit electrical energy to the movable device, then wireless energy transmission is achieved, but high losses occur due to parasitic elements like stray inductance
Solution Approach 1:
The patent converts the harmful stray inductance into a beneficial component by connecting a capacitance in series with it to form a resonant circuit. This resonant circuit is then used to determine the load voltage, transforming the previously harmful parasitic element into a useful measurement and control mechanism that reduces overall transmission losses.
2Stability of the object's composition
If conventional feedback control is used to stabilize load voltage, then voltage stabilization is achieved, but the system becomes complex and slow to respond during start-up phase
Solution Approach 1:
The patent extracts the voltage stabilization function from the complex feedback control system by using the resonant circuit's natural characteristics. Instead of requiring a complete feedback loop with data transmission devices, the load voltage is directly derived from the resonant circuit's properties, eliminating the need for complex feedback mechanisms while maintaining stabilization.
Solution Approach 2:
The resonant circuit automatically determines the load voltage based on its own resonant characteristics and the known transmission voltage. The system uses itself (the resonant circuit) to provide the voltage information needed for control, without requiring external feedback sensors or complex processing, thereby simplifying the overall system.
3Stability of the object's composition
If feedback control is implemented, then load voltage can be stabilized, but the response time is delayed because data transmission devices must first be supplied with energy
Solution Approach 1:
The resonant circuit is established and operational from the very beginning of energy transmission, before any data transmission devices are powered up. The load voltage is determined immediately using the resonant circuit's characteristics and the known transmission voltage, providing instantaneous voltage information without waiting for feedback systems to initialize.
4Ease of operation
If sliding contacts are used to supply electrical energy, then energy transmission is achieved, but material wear increases and space requirements increase
Solution Approach 1:
The patent replaces the mechanical sliding contact system with a magnetic coupling-based wireless energy transmission system. This substitution eliminates the mechanical wear associated with sliding contacts while providing the same energy transmission function, thereby reducing material loss and maintenance requirements.
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 effectively stabilizes the load voltage by utilizing stray inductance for stabilization, eliminating the need for feedback and reducing system complexity, ensuring reliable operation even during start-up and varying load conditions.
Implementation Method 1
a resonant circuit for receiving the transmission voltage, wherein the resonant circuit contains a capacitance and a primary winding of a transformer
Implementation Method 2
the transformer including the primary winding and a secondary winding, wherein the primary winding is provided for transmitting the transmission voltage to the secondary winding
Data Source
AI summary
The embodiments relate to a circuit for transmitting an input voltage from an electrical energy source in a stator to a load within a device movable relative to the stator including an control element for converting an input voltage into a transmission voltage, a resonant circuit for receiving the transmission voltage, wherein the resonant circuit contains a capacitor and a primary winding of a transformer and the transformer having the primary winding and a secondary winding, wherein the primary winding is provided for transmitting the transmission voltage to the secondary winding and the secondary winding is provided for supplying the received transmission voltage to the load.