Vehicle Generator Load Dump Protection Circuit
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Solution Overview
Problem
Existing vehicle-mounted generators face instability in their protection circuits during load dump events, leading to prolonged recovery times for output voltage due to reliance on battery-supplied power and temporary power generation cycles.
Innovation Solution
A vehicle-mounted electric rotating machine with a load dump handling section powered separately from the main power supply, utilizing a power converter and MOS module groups to rapidly manage and dissipate energy during load dump conditions, allowing for reliable protection and quick voltage recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protection circuit is supplied with operating power from the battery charged by the generator, then the protection circuit can operate during normal conditions, but the protection circuit becomes unstable during load dump events
Solution Approach 1:
The power supply system is segmented into two independent sources: the battery for normal operation and a dedicated power supply circuit connected to the generator output for load dump protection. This segmentation allows the protection circuit to operate independently from battery voltage fluctuations during load dump events.
Solution Approach 2:
A dedicated power supply circuit acts as an intermediary between the generator output and the load dump protection circuit. This intermediary provides stable operating power to the protection circuit during load dump events, isolating it from the instability of the battery voltage.
2Reliability
If the protection circuit operates temporarily to prevent excessive voltage drop, then the output voltage can be maintained, but it takes a long time for the voltage to return to normal due to energy accumulation in the stator winding
Solution Approach 1:
The load dump protection circuit is activated in advance before the actual load dump occurs. By detecting the disconnected state of the charging cable beforehand, the system prepares the protection mechanism, allowing for faster response and shorter recovery time when the load dump actually occurs.
Solution Approach 2:
The protection circuit continuously monitors the output voltage and charging cable connection status, providing real-time feedback to the control unit. This feedback mechanism enables the system to detect load dump conditions immediately and activate protection measures without delay, reducing the overall recovery time.
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
Enables reliable load dump protection operations and rapid return of output voltage to normal levels, reducing the time required for voltage stabilization and minimizing the load on the engine.
Implementation Method 1
a field winding (2) wound on a rotor for magnetizing a field pole of the rotor
Implementation Method 2
a stator winding (1A, 1B) for generating an AC voltage in accordance with a rotating magnetic field generated by the field pole
Data Source
AI summary
A vehicle-mounted electric rotating machine includes a field winding wound on a rotor for magnetizing a field pole of the rotor, a stator winding for generating an AC voltage in accordance with a rotating magnetic field generated by the field pole, a power converter for converting the AC voltage to a DC voltage and outputting the DC voltage through a first power supply line connected to an output terminal thereof, and a load dump handling section for performing a load dump protection operation when a voltage of the output terminal of the power converter exceeds a threshold voltage. The load dump handling section is supplied with operating power through a second power supply line provided separately from the first power supply line.