Power Supply Resonance Reactor Peak Current Reduction
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Solution Overview
Problem
In DC to DC converters of chopper type, the resonance reactor experiences high peak currents, necessitating the use of large-sized reactors that do not saturate under high current conditions, limiting the compactness of the power supply unit.
Innovation Solution
The power supply unit incorporates a configuration with a direct current power source, rectifying devices, resonance condensers, and a resonance reactor, where the switching device's control circuit manages the resonance condensers' charging and discharging to reduce peak currents flowing through the resonance reactor, allowing for a compact reactor design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a resonance reactor is used in a DC to DC converter to reduce switching losses and noise, then switching performance is improved, but the reactor requires large size to handle high peak currents without saturation
Solution Approach 1:
The patent divides the resonance circuit into two separate resonance condensers (first resonance condenser and second resonance condenser) that operate in alternating phases. This segmentation allows the resonance reactor to handle lower peak currents at any given time, as the condensers share the resonant energy storage and release functions, thereby enabling a smaller reactor size while maintaining effective switching loss reduction and noise suppression.
Solution Approach 2:
The patent employs periodic action by using two resonance condensers that alternately charge and discharge in a periodic manner. The first resonance condenser operates during one switching phase while the second resonance condenser operates during the next phase, creating a periodic cycle. This periodic operation allows the resonance reactor to process energy in manageable pulses rather than continuous high peak currents, reducing the required reactor size while maintaining effective switching loss reduction and noise suppression.
2Loss of energy
If the resonance reactor is designed to handle high peak currents, then switching loss reduction is achieved, but the number of components and circuit complexity increase
Solution Approach 1:
The patent merges the functions of multiple resonance components into a coordinated system where the first resonance condenser, second resonance condenser, and resonance reactor work together as an integrated resonance circuit. This merging allows the components to share the burden of handling resonant energy, with each component operating at lower stress levels, thereby achieving effective switching loss reduction without requiring an oversized reactor or additional complex components.
Solution Approach 2:
The resonance reactor serves multiple functions simultaneously: it limits current surge during switching transitions, provides resonant energy storage and release through the alternating condensers, and suppresses electromagnetic noise. By designing the reactor to fulfill these multiple roles within a compact form factor, the patent achieves effective switching loss reduction and noise suppression without proportionally increasing component count or circuit complexity.
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 configuration reduces the peak current in the resonance reactor, enabling the use of a smaller, more compact reactor, decreases the number of components, and lowers switching losses and noise, resulting in a power supply unit with reduced size, weight, and cost while maintaining efficient voltage and current switching.
Implementation Method 1
a first resonance condenser having one end which is connected to the anode of the second rectifying device, a second resonance condenser connected to a cathode of the second rectifying device
Implementation Method 2
The DC to DC converter of chopper type, at first, chops the direct current power from a direct current power source, by the direct switching operations of switching elements and converts it to high frequency electric power
Data Source
AI summary
A power supply unit includes: a first rectifying device connected to the direct current power source, a second rectifying device having an anode connected to the first rectifying device, a first condenser having one end connected to the second rectifying device, a second condenser connected to the second rectifying device, a third rectifying device having an anode connected to the second rectifying device, a resonance reactor connected to the third rectifying device and connected to the first condenser, s switching device connected to the direct current power source and connected the third rectifying device, an output reactor connected to the third rectifying device, an output condenser connected to the direct current power source and connected to the output reactor, an output rectifying device connected to the first condenser and connected to the direct current power source, a control circuit sending a gate signal to the switching device.