DC Voltage Detector Isolation Circuit Resonance Amplification
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Solution Overview
Problem
In high voltage to low voltage power supply applications, existing technologies face challenges in achieving efficient isolation with smaller capacitors and lower switching frequencies due to parasitic LC networks causing transient voltage spikes, which require complex snubber networks and compromise efficiency.
Innovation Solution
The implementation of a resonance circuit to amplify parasitic ringing instead of damping it, allowing for the use of smaller isolation capacitors and lower frequency switching transistors, optimizing frequency content and increasing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If snubber networks are used to dampen transient voltage spikes, then voltage stability is improved, but energy efficiency deteriorates due to energy conversion to heat
Solution Approach 1:
The patent converts the harmful parasitic ringing and transient voltage spikes into a beneficial resonant oscillation that can be harnessed for useful work. By adding a resonance circuit that amplifies the natural parasitic ringing instead of damping it, the energy that would normally be wasted as heat in snubber networks is instead utilized to maintain voltage oscillations that assist in the power transfer process, thereby improving overall energy efficiency while maintaining voltage stability
2Volume of stationary object
If smaller isolation capacitors are used, then device size is reduced, but switching frequency must increase which compromises efficiency
Solution Approach 1:
The patent utilizes resonant vibration at a specific frequency to enhance the performance of smaller isolation capacitors. By designing the resonance circuit to operate at the natural resonant frequency of the parasitic LC network, the system achieves effective power transfer and isolation using smaller capacitors without requiring increased switching frequency, thus maintaining energy efficiency while reducing device size
Solution Approach 2:
The patent changes the operating parameters by introducing resonant amplification through the resonance circuit. This allows the system to operate effectively with smaller capacitor values by compensating for the reduced capacitance through resonant energy storage and release, eliminating the need to increase switching frequency and preserving efficiency
3Volume of stationary object
If fast transistors and robust gate drivers are used to reduce switching time, then capacitor value can be reduced, but device complexity increases
Solution Approach 1:
Instead of using fast transistors and robust gate drivers to reduce switching time, the patent converts the harmful effect of parasitic elements into a beneficial resonant oscillation. The resonance circuit amplifies the natural ringing caused by parasitic inductance and capacitance, transforming what would be a source of EMI and inefficiency into a useful mechanism that enables smaller capacitor values without requiring complex high-speed switching components
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 enables the use of smaller isolation capacitors and reduced switching frequencies, enhancing the power supply's efficiency by managing resonant parasitic ringing, while maintaining effective DC voltage detection.
Implementation Method 1
a resonance circuit configured to amplify resonant ringing
Data Source
AI summary
In one embodiment, a power supply circuit has a power source, an inductor in series with a switching transistor connected to the power source, a pair of isolation capacitors connected across the switching transistor, a load connected to the isolation capacitors such that they isolate the load from low frequency energy from the power source, and a resonance circuit configured to amplify resonant ringing connected at least one of in parallel to the inductor or in parallel to the switching transistor.