Battery Charging Device Phase Detection Circuit
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Solution Overview
Problem
Conventional battery charging devices with three-phase alternating current generators are complex and large due to the need for sub-coils or magnet position detectors for advance angle/delay angle control, and setting the optimal delay angle limit value requires extensive labor and testing.
Innovation Solution
A battery charging device that detects alternating current output voltage of one phase and generates synchronous signals for the other phases, allowing for advance angle/delay angle control without individual magnet position detectors or sub-coils, and automatically sets the delay angle limit value based on power generation amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sub-coils or magnet position detectors are provided in each phase for advance angle/delay angle control, then control precision is improved, but device complexity and size increase
Solution Approach 1:
The patent merges the detection function for all three phases into a single sub-coil, eliminating the need for separate sub-coils or magnet position detectors in each phase. The single sub-coil detects the alternating current output voltage of one phase, and the control circuit generates synchronous signals for all three phases based on this single detection, thereby reducing structural complexity while maintaining control precision
Solution Approach 2:
The single sub-coil serves a universal function by detecting the voltage signal that is then used to generate synchronous signals for all three phases (U, V, W). This multi-functional approach allows one detection element to replace what would traditionally require three separate detection elements, reducing overall device complexity
2Measurement precision
If sub-coils are provided in each phase for advance angle/delay angle control, then control accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the detection function for all three phases into a single sub-coil, reducing the number of components that need to be manufactured and assembled. This merging approach directly reduces manufacturing cost while the control circuit compensates by generating accurate synchronous signals for all phases from the single detection source
Solution Approach 2:
Instead of having separate physical detection elements for each phase, the patent creates virtual copies of the detection signal through the control circuit that generates synchronous signals for V and W phases based on the U phase detection. This copying approach maintains control accuracy without the cost of additional physical components
3Productivity
If delay angle limit value is set through extensive testing and experimentation, then power generation optimization is improved, but time and labor consumption increase
Solution Approach 1:
The control circuit automatically determines the optimal delay angle limit value by monitoring the power generation amount and independently adjusting the delay angle without requiring external testing or manual intervention. The system performs self-optimization by detecting when power generation reaches its maximum and setting the delay angle limit accordingly, eliminating the need for extensive external testing
Solution Approach 2:
The patent implements a feedback mechanism where the control circuit continuously monitors the power generation amount and uses this information to automatically adjust and determine the optimal delay angle limit value. This feedback loop enables the system to self-optimize in real-time without requiring external testing or experimentation
Data Source
Figure 1
Figure 2(a)~2(d)
Figure 3A~3B
AI summary
In the battery charging device of the present invention, a U, V, W phase voltage generating circuit detects a voltage signal of a U phase sub-coil of a three-phase alternating current generator, and generates a signal of a triangular wave that is in synchronization with the U phase. Moreover, a first triangular wave is generated in synchronization with a phase from 0° to 180° of the U phase rectangular wave, and a second triangular wave is generated in synchronization with a phase from 180° to 360° of the U phase. In addition, a V phase rectangular wave is generated in which the level is inverted at a voltage point of two thirds the peak voltage of the first triangular wave, and in which the level is inverted at a voltage point of two thirds the peak voltage of the second triangular wave, and a W phase rectangular wave is generated in which the level is inverted at a voltage point of one third the peak voltage of the first triangular wave, and in which the level is inverted at a voltage point of one third the peak voltage of the second triangular wave.