Generator Control Circuit Dynamic Phase Angle Adjustment
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Solution Overview
Problem
Existing generator systems with active bridge rectifiers have a fixed phase angle between phase voltage and current, limiting maximum output current and power, and lacking dynamic control for optimal energy recuperation and torque response.
Innovation Solution
Incorporating a sensor device to determine the rotor position of an AC machine and a control circuit that adjusts the phase angle between phase current and induced voltage, using MOSFET switches to switch on and off, allowing for dynamic control of the phase angle and optimizing output power and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a fixed phase angle control is used in the active bridge rectifier, then the generator structure is simple, but the maximum output current and power are limited
Solution Approach 1:
The patent implements dynamic phase angle control where the phase angle between voltage and current is continuously adjusted based on operating conditions. The control circuit dynamically modifies the firing angles of thyristors to optimize power output at different generator speeds and load conditions, transforming the fixed phase angle system into a dynamic one that adapts to varying requirements.
Solution Approach 2:
The patent changes the electrical parameter (phase angle) of the rectifier circuit to optimize performance. By varying the phase angle between voltage and current through controlled thyristor conduction angles, the system achieves different operating points that maximize power output under different conditions, effectively using parameter adjustment to resolve the power limitation.
2Productivity
If dynamic phase angle control is implemented, then the output power and efficiency are optimized, but the control system complexity increases
Solution Approach 1:
The patent incorporates feedback mechanisms where the control circuit continuously monitors generator operating parameters (speed, load, voltage, current) and adjusts the phase angle accordingly. This closed-loop control ensures optimal energy recuperation by automatically adapting to changing conditions, while the feedback information guides the thyristor switching to maintain maximum efficiency.
3Speed
If the phase angle is fixed, then the control system is simple, but the torque response and voltage response are slow
Solution Approach 1:
The dynamic phase angle control enables fast torque and voltage response by immediately adjusting the thyristor conduction angles in response to load changes. When torque demand changes, the control circuit rapidly modifies the phase angle to optimize power transfer, providing fast dynamic response that a fixed phase angle system cannot achieve.
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 enables higher maximum current and power output, improved energy recuperation, faster torque and voltage response, potential downsizing of the generator, and enhanced reliability and fuel economy.
Implementation Method 1
The sensor device is configured to determine a rotor position of the AC machine
Implementation Method 2
the rectifier circuit to switch the switches on and off to convert an AC signal to a DC signal
Implementation Method 3
Vehicles employ generators that are driven by a belt coupled to the vehicle engine to generate electrical power. Automotive electrical generators typically employ an AC synchronous machine
Data Source
AI summary
A generator system includes an AC machine including a plurality of armature coils and a rectifier circuit electrically coupled to the armature coils. The rectifier circuit includes a plurality of switches. The generator system additionally includes a sensor device electrically coupled to a control circuit. The sensor device is configured to determine a rotor position of the AC machine. The control circuit determines a desired phase angle between a phase current and an induced voltage of the AC machine and provides a control signal to the rectifier circuit to switch the switches on and off to convert an AC signal to a DC signal and to control the rotor position of the AC machine to achieve the desired phase angle.