Surge Suppression Circuit Topology for Rotating Machine Cable Surges
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Solution Overview
Problem
In rotating electrical machine systems, impedance mismatch between electrical cables and machines generates surge voltages, leading to power loss and potential damage due to high temperatures and discharge issues in conventional surge suppression circuits.
Innovation Solution
A surge suppression circuit utilizing upper and lower diodes connected to connection lines, with a voltage holding circuit that includes a charging unit to store and a discharge unit to manage surge voltage, reducing power loss by minimizing frequent charging and discharging and incorporating inrush current suppression resistors to stabilize the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surge suppression circuits with resistors and capacitors are used to suppress surge voltage, then surge voltage is suppressed, but power loss increases and heat dissipation becomes significant
Solution Approach 1:
The invention changes the circuit configuration from a conventional RC-based surge suppression circuit to a voltage holding circuit using diodes and capacitors. This parameter change in circuit topology eliminates the continuous power consumption issue while maintaining surge suppression capability. The voltage holding circuit holds the surge voltage for a predetermined period without requiring continuous resistor-based dissipation, thereby significantly reducing power loss.
2Reliability
If conventional surge suppression circuits with resistors are used to suppress surge voltage, then surge voltage is suppressed, but temperature increases requiring large cooling structures
Solution Approach 1:
The invention replaces the resistor-based energy dissipation mechanism with a voltage holding mechanism using diodes and capacitors. This fundamental parameter change in the suppression mechanism eliminates continuous heat generation from resistors. The voltage holding circuit stores surge energy temporarily and releases it when appropriate, avoiding the temperature rise issue that would require large cooling structures.
3Loss of energy
If voltage holding circuit is used to suppress surge voltage, then power loss is reduced, but inrush current occurs during charging
Solution Approach 1:
The invention applies a surge suppression resistor in series with the voltage holding circuit during the initial charging phase. This preliminary protective measure limits the inrush current when the capacitor is first charged. After the surge event is suppressed and the capacitor is charged, the resistor can be bypassed or its effect becomes negligible, allowing the voltage holding circuit to operate efficiently without continuous power loss.
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
Effectively suppresses surge voltage while minimizing power loss and preventing damage to rotating electrical machines by efficiently managing surge energy and reducing heat dissipation needs.
Implementation Method 1
a charging unit to store electric charge by the surge voltage
Implementation Method 2
a plurality of upper diodes with anodes respectively connected to the plurality of connection lines; a plurality of lower diodes with cathodes respectively connected to the plurality of connection lines
Data Source
AI summary
A surge suppression circuit is used in a rotating electrical machine system including a switching circuit composed of a plurality of switching elements and a rotating electrical machine connected thereto via an electrically conducting path comprising a plurality of electrically conductive bodies. The surge suppression circuit suppresses surge voltage generated in a plurality of connecting lines connecting the plurality of electrically conductive bodies to windings of plural phases of the rotating electrical machine. The surge suppression circuit includes a plurality of upper diodes with anodes respectively connected to the plurality of connection lines, a plurality of lower diodes with cathodes respectively connected to the plurality of connection lines, an upper line connected to respective cathodes of the plurality of upper diodes, a lower line connected to respective anodes of the plurality of lower diodes, and a voltage holding circuit connected between the upper line and the lower line. The voltage holding circuit includes a charging unit to store electric charge by the surge voltage and a discharge unit to discharge the electric charge stored in the charging unit.