EV Charging Circuit Grid Frequency Initialization to Cut Reactive Power
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Solution Overview
Problem
Existing charging circuits for electric vehicles fail to efficiently adapt to different global power supply network frequencies, leading to prolonged determination of grid frequency and increased reactive power feedback into the network.
Innovation Solution
A charging circuit with a detector and control system using a non-volatile memory to store a previously determined grid frequency as an initial starting value, allowing rapid adjustment of operational properties to minimize phase shift and reactive power, utilizing GPS for geographic position-based frequency determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If grid frequency determination starts from an arbitrary initial value, then the charging circuit can operate with a simple initialization process, but the determination of grid frequency takes significantly longer and may not converge quickly to the actual frequency
Solution Approach 1:
The patent applies preliminary action by determining and storing the grid frequency in advance in a non-volatile memory before the actual charging operation begins. When the charging circuit is activated, the stored frequency value is immediately retrieved and used as the initial starting value for the phase-locked loop, eliminating the need for time-consuming frequency acquisition from an arbitrary value and enabling immediate accurate frequency determination.
Solution Approach 2:
The patent uses copying by creating a copy of the previously determined grid frequency and storing it in non-volatile memory. This copied frequency value is then retrieved and used as the initial starting value for the phase-locked loop, allowing the system to bypass the lengthy frequency acquisition process and start operation with an accurate pre-copied frequency value.
2Adaptability or versatility
If the charging circuit uses a fixed predetermined grid frequency, then the system structure remains simple, but the circuit cannot adapt to different global power supply network frequencies (50 Hz vs 60 Hz)
Solution Approach 1:
The patent applies dynamics by implementing a phase-locked loop that can dynamically adjust and lock onto different grid frequencies. The system retrieves a stored frequency value and uses it to initialize the phase-locked loop, which then automatically adapts to the actual grid frequency (either 50 Hz or 60 Hz or other frequencies) by adjusting its internal parameters, enabling the charging circuit to operate across different power supply networks.
Solution Approach 2:
The system applies self-service by automatically determining and storing the grid frequency without requiring manual configuration or user input. The non-volatile memory stores the detected frequency, and the phase-locked loop automatically uses this stored value as its starting point, allowing the charging circuit to self-adapt to different grid frequencies based on the environment where it is deployed.
3Productivity
If the charging circuit operates without accurate grid frequency information, then the system can start immediately, but reactive power feedback into the power supply network increases and charging efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-determining and storing the grid frequency before charging operations begin. This stored frequency information is immediately available when the charging circuit is activated, allowing the phase-locked loop to start with an accurate reference value and quickly achieve optimal operation, thereby maximizing charging efficiency from the very beginning of the charging process.
Solution Approach 2:
The patent uses feedback by implementing a phase-locked loop that continuously monitors and adjusts its operation based on the actual grid frequency. The loop compares the reference frequency (from stored initial value) with the actual input frequency and automatically adjusts to minimize phase difference, ensuring optimal power transfer efficiency and minimizing reactive power feedback to the grid throughout the charging process.
Data Source
AI summary
The invention relates to the charging of a traction battery by means of AC voltage, wherein a frequency of the AC voltage used for this purpose is taken into account during the charging. An initial starting value is used in order to determine the frequency of the AC voltage. This initial starting value can be provided by a non-volatile memory.