Auxiliary Power Converter Circuit for Load Voltage Spike Control
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Solution Overview
Problem
Existing power converters face challenges in maintaining stable load voltage and preventing voltage spikes when high current slew rates occur, due to limitations in capacitor selection and physical space, leading to potential load failure and power loss.
Innovation Solution
An auxiliary circuit is introduced that generates an auxiliary current to limit load voltage variation, using a DC blocking capacitor and voltage-controlled current source circuit to stabilize load voltage and reduce power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a capacitor with larger capacitance value is used to maintain stable load voltage, then the voltage stability is improved, but the parasitic effect increases and physical space requirements increase
Solution Approach 1:
The patent divides the single capacitor function into multiple components: a DC blocking capacitor and an auxiliary circuit with voltage-controlled current source. This segmentation allows each component to address specific frequency ranges, reducing the parasitic effects associated with a single large capacitor while maintaining overall voltage stability.
Solution Approach 2:
The patent changes the operational parameters by introducing an auxiliary circuit that dynamically adjusts auxiliary current based on load conditions. This allows the system to maintain voltage stability across varying load conditions without requiring a fixed large capacitor that would introduce parasitic effects.
2Stability of the object's composition
If different kinds of capacitors are used together to attenuate impedance in different frequency ranges, then the voltage regulation is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a DC blocking capacitor as an intermediary element that works with the auxiliary circuit. This intermediary approach simplifies the overall configuration by using a single capacitor in series with a controlled current source, rather than requiring multiple capacitors in complex arrangements.
Solution Approach 2:
The auxiliary circuit automatically adjusts the auxiliary current based on detected load voltage variations, eliminating the need for manual configuration of multiple capacitors. The system self-regulates to maintain voltage stability without increasing device complexity.
3Stability of the object's composition
If sufficient high-frequency capacitors are placed close to the load to attenuate high-frequency impedance, then the high-frequency voltage regulation is improved, but the physical space and area requirements increase
Solution Approach 1:
The patent replaces the mechanical approach of placing physical capacitors close to the load with an electrical solution using a voltage-controlled current source. This substitution eliminates the need for additional physical space while achieving the same high-frequency impedance attenuation effect.
Solution Approach 2:
The patent transitions from a spatial solution (placing capacitors physically close to load) to a temporal/dynamic solution (using fast-responding voltage-controlled current source). This dimensionality change allows high-frequency regulation without increasing physical footprint.
4Stability of the object's composition
If the auxiliary circuit generates auxiliary current to limit load voltage variation, then the voltage stability is improved, but the power loss increases
Solution Approach 1:
The auxiliary circuit provides partial compensation by generating auxiliary current only when load voltage variation exceeds predetermined thresholds. This partial action approach maintains voltage stability during critical conditions while minimizing power loss during normal operating conditions.
Solution Approach 2:
The auxiliary circuit preemptively generates auxiliary current to counteract impending voltage drops before they occur. By acting in advance during transient conditions, the system maintains stability without requiring continuous current generation that would increase power loss.
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 auxiliary circuit effectively maintains load voltage stability and reduces power loss by attenuating impedance across various frequency ranges, improving dynamic response speed and preventing voltage spikes.
Implementation Method 1
using a DC blocking capacitor and voltage-controlled current source circuit to stabilize load voltage
Implementation Method 2
voltage-controlled current source circuit to stabilize load voltage and reduce power loss
Data Source
AI summary
An auxiliary circuit of a power converter is disclosed, where: the auxiliary circuit is coupled to a load of the power converter; and the auxiliary circuit is configured to generate an auxiliary current provided to the load, in order to limit a variation range of a load voltage of the load when a variation of an output signal of the power converter is greater than a predetermined value.