Solid-State Magnet Control Unit Regeneration Current Management
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Solution Overview
Problem
Existing solid-state magnet control units for industrial electromagnets face challenges in managing regeneration current and preventing overvoltage events, which can damage components and disrupt operations.
Innovation Solution
The proposed magnet control unit includes a processor-driven bridge network and dump network that monitors DC bus voltage, automatically shorting magnet terminals if necessary and configuring to safety mode in case of dump network failure, and temporarily re-applies power during regeneration to manage voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dump network is used to absorb regeneration current, then overvoltage protection is improved, but system complexity increases
Solution Approach 1:
The patent combines the dump network functionality with the bridge network into a single integrated control unit. The processor monitors DC bus voltage and controls both the bridge network drivers and dump network switches, merging protection and control functions into one system that shares common components and control logic.
Solution Approach 2:
The bridge network is designed to perform multiple functions: normal magnet control operation and dump network operation for overvoltage protection. The same hardware components (drivers, switches, sensors) serve dual purposes, eliminating the need for separate dedicated overvoltage protection equipment.
2Stability of the object's composition
If the dump network is configured to absorb regeneration current, then voltage stability is improved, but component reliability requirements increase
Solution Approach 1:
The processor continuously monitors DC bus voltage and activates the dump network before overvoltage damage can occur. By detecting voltage thresholds in advance and preemptively switching in the dump network, the system cushions against potential overvoltage events and protects components from stress.
Solution Approach 2:
The system employs continuous feedback through voltage sensing that monitors DC bus voltage levels and feeds this information back to the processor. The processor adjusts dump network switching based on real-time voltage conditions, creating a closed-loop control system that maintains voltage stability while protecting components.
3Reliability
If the bridge network is configured for safety mode operation, then system safety is improved, but current handling capability is reduced
Solution Approach 1:
The bridge network operates in different dynamic modes: normal operation mode for standard magnet control and safety mode for overvoltage conditions. The system dynamically switches between these modes based on processor determination of dump network functionality and voltage levels, optimizing performance for each operating condition.
Solution Approach 2:
The system changes operational parameters by reconfiguring the bridge network topology between normal and safety modes. In safety mode, the bridge network diverts regeneration current through alternative paths with different resistance and current handling characteristics, prioritizing safety over maximum power capability.
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 effectively manages regeneration current, prevents overvoltage damage, and ensures safe operation by maintaining controlled voltage levels and diverting regeneration current, thereby enhancing the reliability and safety of electromagnet control systems.
Implementation Method 1
the processor automatically configures the bridge network to a safety mode of operation which diverts regeneration current from the magnet through the terminals
Implementation Method 2
Electromagnets for use with lifts, hoists, crane and any other industrial machinery are well known and are used for positioning and handling ferromagnetic materials
Data Source
AI summary
A solid-state magnet control unit includes a housing and magnet controller circuitry mounted within the housing. The magnet controller circuitry controls current passing through a magnet. The magnet controller circuitry includes a power storage unit, drivers in a bridge network, e.g., an insulated gate bipolar transistor (IGBT) in a bridge network, and dump circuitry. The dump circuitry limits circuit damage to the magnet controller circuitry and other components contained within the magnet control unit. When the dump driver is not operational, operation of the magnet control unit is automatically switched to first or second safety mode of operation.