Stepped Load Current Circuit Logic for Lower Magnetic Fields
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Solution Overview
Problem
Existing methods for controlling electrical loads generate broad current spectra with steep edges, leading to increased magnetic fields due to rapid current changes, which can be detrimental.
Innovation Solution
A circuit unit with switch elements and resistance elements is used to control load currents in steps, reducing current gradients and thereby limiting magnetic field development, utilizing a circuit logic to activate switch elements sequentially to manage load current transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If driver stages generate square-wave voltages and currents with steep edges for power control, then power dissipation in drivers is kept low, but magnetic fields are increased due to rapid current changes
Solution Approach 1:
The patent segments the single steep current transition into multiple smaller steps by using multiple driver stages activated in sequence. Each driver stage contributes a portion of the total current, and by activating them one after another rather than simultaneously, the current gradient is divided into manageable increments that reduce magnetic field generation while maintaining overall power control efficiency.
Solution Approach 2:
The circuit logic activates driver stages in a predetermined sequence before the final current level is reached. This preliminary staged activation allows the system to prepare for the current transition in controlled increments, ensuring that the total current change is distributed over time rather than occurring as a single abrupt event, thereby reducing electromagnetic interference.
2Object-generated harmful factors
If multiple switch elements are used to step load current, then current gradient is reduced and magnetic fields are limited, but circuit complexity increases
Solution Approach 1:
Multiple driver stages and resistance elements are merged into a single integrated circuit unit with unified control logic. This consolidation allows the complex multi-stage current control function to be implemented as one cohesive device rather than separate components, managing circuit complexity while achieving the goal of reduced current gradients and limited magnetic fields.
Solution Approach 2:
The circuit logic serves multiple functions: it controls the sequential activation of driver stages, manages the switching of resistance elements, and coordinates the overall current profile. This multi-functionality reduces the need for separate control circuits for each driver stage, thereby managing complexity while achieving staged current control.
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
The solution effectively reduces magnetic field generation by controlling load currents through gradual current transitions, optimizing circuit complexity and current gradient limitations.
Implementation Method 1
m resistance elements with m≥1, wherein resistance elements can be bridged by means of switch elements
Data Source
AI summary
The invention relates to a circuit unit for controlling load currents of an electrical load, comprising a circuit logic, at least n switch elements with n≥2, resistance elements with m≥1, wherein the resistance elements can be bridged by means of the switch elements, wherein the circuit logic is designed such that it increases the load current in steps to a final value by means of an activation sequence of the switch elements, and a method for controlling load currents of an electrical load.