Adaptive Resonant Frequency Converter for Parasitic Compensation
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Solution Overview
Problem
Conventional resonant power converters experience diminished performance efficiency and control at very high switching frequencies due to parasitic components altering the resonant frequency, leading to increased switching losses and electromagnetic interference.
Innovation Solution
A resonant power converter with a signal processing circuit that adjusts the switching frequency to match the altered resonant frequency caused by parasitics, using a zero voltage switching circuit, signal generator, detection circuit, and latch oscillator to maintain resonance and filter out harmonics, ensuring efficient operation at frequencies above 1 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resonant power converters operate at very high switching frequencies (1 MHz and greater), then power density and switching efficiency improve, but parasitic components alter the resonant frequency causing diminished performance and control
Solution Approach 1:
The patent implements adaptive frequency adjustment where the switching frequency dynamically tracks the resonant frequency. The controller continuously monitors the resonant tank's actual resonant frequency (altered by parasitics) and adjusts the switching frequency in real-time to maintain resonance, enabling reliable operation at very high frequencies up to 1 MHz and greater
Solution Approach 2:
The system employs feedback mechanisms where the controller detects the actual resonant frequency of the resonant tank and uses this information to adjust the switching frequency. This closed-loop control ensures the converter maintains optimal performance by compensating for parasitic effects that shift the resonant frequency at high operating frequencies
2Productivity
If resonant power converters operate at very high switching frequencies, then power density increases, but switching losses and electromagnetic interference increase
Solution Approach 1:
The patent utilizes resonant oscillation principles where the resonant tank (comprising inductor and capacitor) is driven at its natural resonant frequency. This creates oscillating current and voltage waveforms that enable soft switching conditions, reducing switching losses even at very high frequencies. The resonant oscillation naturally limits voltage and current stress on switching components
Solution Approach 2:
The system changes the operating parameters by dynamically adjusting the switching frequency to match the resonant frequency. This parameter adaptation allows the converter to operate efficiently at very high frequencies by maintaining resonant conditions, thereby reducing switching losses and EMI while achieving high power density
3Productivity
If resonant power converters operate at very high switching frequencies, then switching efficiency improves, but control and regulation become less predictable
Solution Approach 1:
The controller implements feedback control by continuously monitoring the resonant tank's actual resonant frequency and adjusting the switching frequency accordingly. This closed-loop operation provides predictable control and regulation even at very high switching frequencies, as the system automatically compensates for parasitic effects that would otherwise cause performance degradation
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 enables the resonant power converter to maintain resonance and reduce voltage stress on switches by filtering out second harmonics, thereby improving efficiency and predictability even at high frequencies, ensuring stable operation across varying input voltages and loads.
Implementation Method 1
The resonant tank includes circuit components, such an inductor and a capacitor, that are designed to have a resonant frequency that is tuned to a designed switching frequency of the main switch
Implementation Method 2
The signal processing circuit includes a zero voltage switching (ZVS) circuit, a signal generator, a detection circuit, and a latch oscillator. The signal processing circuit is configured to adjust the switching frequency of the driving signal to be tuned to the actual resonant frequency
Data Source
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AI summary
A resonant power converter has a main switch, a resonant tank coupled across the main switch, and a signal processing circuit coupled to the main switch and the resonant tank. The signal processing circuit generates a driving signal for driving the main switch ON and OFF at a switching frequency. The resonant tank includes circuit components designed to have a resonant frequency that is tuned to a designed switching frequency of the main switch. The signal processing circuit includes a zero voltage switching (ZVS) circuit, a signal generator, a detection circuit, and a latch oscillator. The signal processing circuit is configured to adjust the switching frequency of the driving signal to be tuned to the actual resonant frequency of a resonant tank under very high switching frequency conditions, 1 MHz and greater, thereby accounting for the influence of parasitics at very high switching frequencies and achieving resonance of the circuit.