Driving Circuit With Energy-Storage Capacitor For High Peak Power
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Solution Overview
Problem
Conventional driving circuits are unable to efficiently manage loads that require low average power and high peak power, leading to insufficient power supply during heavy load intervals due to maximum output power limitations.
Innovation Solution
A driving circuit comprising an energy-storage capacitor and a bidirectional converter, where the first power converter supplies power during light and heavy load intervals, and the energy-storage capacitor provides additional power via the bidirectional converter during peak demand, allowing the voltage to vary widely and reducing capacitor capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single power converter is used to drive the load, then the circuit structure is simple, but the power converter cannot provide sufficient power during heavy load intervals when peak power exceeds maximum output power
Solution Approach 1:
The power supply system is segmented into two functional modules: a first power converter for providing base power during light load intervals, and a second power converter coupled with an energy storage capacitor for providing additional power during heavy load intervals. This segmentation allows each converter to be optimized for specific operating conditions, enabling the system to deliver high peak power while maintaining relatively simple individual circuit structures.
Solution Approach 2:
The energy storage capacitor is pre-charged during light load intervals when the first power converter operates independently. This preliminary energy storage action ensures that sufficient energy is available in the capacitor before heavy load intervals occur, enabling the second power converter to immediately supplement power when needed without requiring the first power converter to be oversized for peak conditions.
2Power
If the maximum output power of the power converter is increased to meet peak power requirements, then sufficient power is available during heavy load intervals, but the power converter cannot operate efficiently during light load intervals
Solution Approach 1:
The system dynamically switches between different power supply configurations based on load conditions. During light load intervals, only the first power converter operates at lower power levels, maintaining energy efficiency. During heavy load intervals, the second power converter is activated and coupled in parallel with the first, dynamically increasing the total output power capability. This dynamic reconfiguration allows the system to match power output with actual demand, avoiding the energy losses associated with operating an oversized converter at low load.
Solution Approach 2:
The first power converter serves multiple functions: it provides power to the load during both light and heavy load intervals, and it charges the energy storage capacitor during light load intervals. The second power converter and energy storage capacitor combination serves as a supplemental power source that activates only when needed. This multi-functionality allows the system to use a single converter for base operations while having a second converter available for peak power supplementation, optimizing both efficiency and power capability.
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
Enables the driving circuit to handle loads with low average and high peak power requirements, reducing the volume and cost of the energy-storage capacitor while minimizing the maximum power demand of the first power converter.
Implementation Method 1
a driving circuit includes an energy-storage capacitor, a first power converter and a bidirectional converter
Data Source
AI summary
A driving circuit and a driving method are provided. The driving circuit includes an energy-storage capacitor, a first power converter and a bidirectional converter. An output port of the first power converter is coupled to a load and the energy-storage capacitor. The energy-storage capacitor is connected in parallel with the load. The bidirectional converter is coupled between the load and the energy-storage capacitor. The first power converter supplies power to the load during a light load interval. During at least a part of the light load interval, the first power converter charges the energy-storage capacitor via the bidirectional converter. During a heavy load interval, the first power converter supplies power to the load and the energy-storage capacitor supplies power to the load via the bidirectional converter. The driving circuit is applicable to drive a load requiring low average power and high peak power.