Power Converter Clamp Circuit for Zero-Voltage Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power converter topologies suffer from parasitic oscillations during dead time, leading to energy dissipation and noise injection, with prior solutions either dissipating energy or not utilizing it for improving switching conditions.
Innovation Solution
The introduction of a Controlled Energy Preservation Module (CEPM) and Current Injection Module (CIM) to extract and utilize parasitic energy for achieving zero voltage switching conditions, reducing energy dissipation and noise by converting parasitic oscillations into magnetic energy and injecting controlled energy to maintain optimal switching conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If parasitic oscillations are eliminated by dissipating energy through conduction and magnetic core loss, then oscillations are reduced, but energy efficiency deteriorates due to significant energy dissipation
Solution Approach 1:
The patent captures the parasitic oscillation energy that would otherwise be dissipated as loss and redirects it to assist in achieving zero voltage switching conditions. The energy from parasitic oscillations is used to charge the parasitic capacitance, enabling the main switch to turn on at zero voltage, thus converting harmful oscillations into beneficial switching conditions and eliminating energy waste.
2Stability of the object's composition
If dead time is extended to allow parasitic oscillations to settle, then switching stability improves, but power conversion efficiency deteriorates due to increased energy loss
Solution Approach 1:
Instead of allowing parasitic oscillations to decay naturally during dead time (which wastes energy), the patent captures this oscillation energy and uses it to charge the parasitic capacitance. This enables the main switch to achieve zero voltage switching immediately, eliminating the need for extended dead time and converting energy loss into switching efficiency improvement.
3Object-affected harmful factors
If parasitic oscillations are suppressed using prior art solutions, then noise injection is reduced, but energy utilization for improving switching conditions is lost
Solution Approach 1:
The patent simultaneously addresses noise suppression and energy utilization by capturing parasitic oscillation energy and redirecting it to charge the parasitic capacitance. This dual approach eliminates noise injection while also providing the energy needed for zero voltage switching, unlike prior art that only suppressed oscillations without energy recovery.
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
This approach enhances power conversion efficiency by minimizing energy loss and noise, allowing for efficient zero voltage switching even during large dead times, and enables operation at higher frequencies without valley detection, improving overall system optimization.
Implementation Method 1
the inductive elements connected to the switching node which form a resonant circuit with the parasitic capacitance C,120 and parasitic oscillations do occur in the switching node
Implementation Method 2
extract and utilize parasitic energy for achieving zero voltage switching conditions, reducing energy dissipation and noise by converting parasitic oscillations into magnetic energy
Data Source
AI summary
A switching power conversion apparatus for converting power from an input voltage source to a load includes first and second switches connected to a switching node. An inductive element has a magnetizing current connected to the node, and the inductive element is connected to deliver energy via the first and second switches from the input voltage to the load during a succession of power conversion cycles. A capacitance connected to the node resonates with the inductive element to cause parasitic oscillation. A clamp subcircuit across the inductive element contains an auxiliary switch to trap energy and prevent parasitic oscillation, wherein the auxiliary switch is complementary to the first switch. A controlled voltage source injects energy in the inductive element, when the auxiliary switch turns off to discharge the parasitic capacitance by using trapped energy in the inductive element in addition to injected energy from the controlled voltage source.