Resonant Power Control Circuit for Charge Storage Element
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Solution Overview
Problem
Existing power control circuits for charge storage elements, particularly in step up/down chopper systems, face challenges in minimizing switching loss, cost, and body size, especially when the voltage of the charge storage element is reduced to zero or less, and require an efficient method to reduce switching losses and optimize circuit design.
Innovation Solution
A power control circuit that includes a DC voltage source, switches, an inductor, and capacitance components connected in series and parallel, with a control circuit that manages the switches to implement soft switching by resonating the capacitance and inductor components, reducing switching loss and optimizing circuit size and cost through reduced part count and efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If hard switching is used in power control circuits, then the circuit structure is simple, but switching loss increases and efficiency decreases
Solution Approach 1:
The patent applies resonant oscillation (analogous to mechanical vibration principles) by connecting a capacitor and inductor to form a resonance circuit. This resonance reduces the voltage across the switch before turn-on, enabling soft switching and reducing switching loss while maintaining reasonable circuit complexity
Solution Approach 2:
The patent changes the switching mode from hard switching to soft switching by introducing resonant elements. This parameter change in the switching characteristics reduces switching loss and improves efficiency without requiring complete redesign of the power control circuit
2Volume of moving object
If switching frequency is increased to achieve miniaturization, then the converter size is reduced, but switching loss increases and efficiency decreases
Solution Approach 1:
By utilizing resonant oscillation in the circuit, the patent enables soft switching that reduces switching loss. This allows the converter to operate at higher switching frequencies for miniaturization without the penalty of increased switching losses
Solution Approach 2:
The patent converts the potentially harmful effect of high-frequency switching (increased switching loss) into a benefit by using the resonant frequency to enable soft switching. The resonance that could cause voltage spikes is instead used to reduce voltage across the switch during turn-on
3Manufacturing precision
If the voltage of the charge storage element is reduced to zero or less for optimal power control, then power control precision is improved, but the applied voltage to switches increases requiring high voltage-resistant elements
Solution Approach 1:
The patent introduces a capacitor and inductor as intermediary elements that form a resonance circuit. These intermediaries buffer the voltage transitions and reduce the voltage across the switch during critical switching moments, allowing the charge storage element voltage to be reduced to zero or less for optimal power control
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 effectively reduces switching loss, minimizes circuit size and cost, and enables optimal power control by using soft switching techniques, allowing for efficient power transfer and voltage control in step up/down chopper systems, particularly when the voltage of the charge storage element is zero or less.
Implementation Method 1
the control circuit turns on a switch to be turned on when a voltage across the switch to be turned on is reduced by resonance of a resonance circuit comprising the capacitance component and the inductor
Data Source
AI summary
A DC voltage source, a switch, and an inductor are connected together in series. The inductor is also connected together with a switch, a piezoelectric element in series. Moreover, the switches are connected in parallel with capacitors. By the control circuit, a state in which either of the switches is turned on is repeated through a state in which both of the switches are turned off. Furthermore, in a state in which both switches are turned off, after turning the switch off to enter the state concerned, when the voltage across both terminals of the switch that will be turned on is reduced by the resonance of a resonance circuit composed of the capacitors and the inductor, the switch concerned is turned on.