Energy Storage Module Current Control for Stable Buck Conversion
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Solution Overview
Problem
Existing battery cell packs face challenges in maintaining well-defined output voltage and current parameters due to internal and external non-idealities, particularly in buck-type power converters like multi-level inverters, where achieving stable closed-loop responses is difficult.
Innovation Solution
Implementing a circuit with a transfer function comprising a first gain component with a higher than first-order low-pass response and a second gain component, along with a unit gain response, to control the module current and ensure stable operation of energy storage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional control methodologies are used in buck-type power converters, then the system structure remains simple, but the output voltage and current parameters become unstable due to internal and external non-idealities
Solution Approach 1:
The patent implements a closed-loop control system that continuously monitors the actual output voltage and current, compares them with reference values, and adjusts the switching signals accordingly. This feedback mechanism compensates for internal non-idealities (such as component tolerances) and external disturbances (such as load variations), ensuring stable output parameters despite the added control complexity
Solution Approach 2:
The patent dynamically adjusts control parameters including duty cycle, switching frequency, and gain values based on operating conditions. By changing these parameters in real-time, the system maintains optimal performance and stability across different load conditions and temperature ranges, addressing the reliability challenge without requiring overly complex hardware
2Manufacturing precision
If conventional control is applied to multi-level inverters, then the device structure remains straightforward, but achieving well-defined output independent of non-idealities becomes difficult
Solution Approach 1:
The patent employs multiple feedback loops that independently monitor and control different output parameters. This multi-variable feedback approach ensures that each output parameter (voltage and current) maintains precise values despite variations in component characteristics or operating conditions, achieving manufacturing precision through active compensation
Solution Approach 2:
The system performs preliminary calibration and parameter adjustment during startup and mode transitions to preemptively compensate for expected non-idealities. By preparing the control parameters in advance based on predicted operating conditions, the system achieves precise output without requiring complex real-time adjustments
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
The solution ensures stable and well-defined output voltage and current parameters in energy storage systems, effectively addressing non-idealities and enhancing the performance of buck-type power converters.
Implementation Method 1
converting, via an inductor, a difference between the input voltage and the counter voltage to a module current
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Systems, methods and software products for operating circuit with energy storage module (ESM). The methods comprising: providing, at input port, an input voltage (IV); providing, via PWM, counter voltage (CV2); converting, via inductor, a difference between IV and CV2 to module current (MC) which charges or discharges ESM; providing reference waveform signal (RWS); generating error signal (ES) by combining MC measurement with RWS; applying, to ES, a transfer function (TF) to obtain correction signal (CS1); generating control signal (CS2) by combining CS1 with IV measurement; and using CS2 to govern MC's instantaneous value. TF may comprise: first gain component (FGC) having a higher than first-order low-pass response with a first corner frequency (CF), and a first low-frequency (DC) gain value; a second gain component acting parallelly to FGC and having a second low-frequency (DC) gain value; and a unit gain response providing a gain between TF's input and output.