Voltage Conversion Device Using Current Sensor Inductance for Resonance
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Solution Overview
Problem
Conventional insulation type DC-DC converters face challenges in size increase due to the need for additional inductors for current resonance, and magnetic saturation issues when using transformer leakage inductance, which affects the device's size and versatility.
Innovation Solution
A voltage conversion device utilizing the inductance of a current sensor as an inductance component in the resonant circuit on the primary side, which can include leakage inductance of the transformer and an additional inductor, to set a wider range of inductance components and control resonance frequency, thereby limiting device size and improving versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional inductor is provided in the primary side resonance circuit, then current resonance can be achieved, but the size of the DC-DC converter increases
Solution Approach 1:
The patent combines the inductor function with the current sensor by winding the sensor coil around a magnetic core that also serves as the inductor. This integration eliminates the need for separate inductor and current sensor components, achieving current resonance while maintaining compact converter size.
Solution Approach 2:
The magnetic core structure serves multiple functions simultaneously: it acts as the magnetic path for transformer coupling, provides inductance for resonance, and serves as the sensing element for current detection. This multi-functionality resolves the contradiction by eliminating dedicated separate components.
2Volume of stationary object
If the leakage inductance of the transformer is used as the inductance component, then the converter size can be reduced, but magnetic saturation occurs at high current capacity
Solution Approach 1:
The patent separates the inductance function from the transformer leakage inductance by providing a dedicated inductor with its own magnetic core. This segmentation allows the transformer to operate without magnetic saturation while the dedicated inductor provides the necessary inductance for resonance, resolving the contradiction between size and saturation resistance.
Solution Approach 2:
The dedicated inductor acts as an intermediary element that provides the required inductance for resonance without relying on the transformer's leakage inductance. This intermediary component prevents magnetic saturation in the transformer while enabling current resonance, thus resolving the technical contradiction.
3Device complexity
If the inductance component range is limited, then the converter structure is simplified, but the versatility for different input voltages is reduced
Solution Approach 1:
The patent enables dynamic adjustment of the inductance component range by allowing selection between different inductor configurations or values. This dynamic capability maintains relatively simple converter structure while achieving versatility for different input voltage ranges through adjustable inductance settings.
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 allows for a more compact design, wider inductance component range, and better handling of varying input voltages, enhancing the device's versatility and maintaining stable output voltage with reduced losses.
Implementation Method 1
a current sensor (for example, the current transformer 64 in the embodiment) provided on the primary side, wherein an inductance (for example, the inductance Lct in the embodiment) of the current sensor is used as an inductance component of a resonant circuit
Implementation Method 2
a transformer (for example, the transformer 65 in the embodiment) including a primary coil (for example, the primary coil 65a in the embodiment) provided on a primary side with a relatively high voltage and a secondary coil (for example, the secondary coil 65b in the embodiment) provided on a secondary side with a relatively low voltage
Implementation Method 3
an inductance (for example, the inductance Lct in the embodiment) of the current sensor is used as an inductance component of a resonant circuit (for example, the series resonant circuit 69 in the embodiment) on the primary side
Data Source
AI summary
A voltage conversion device includes: a transformer including a primary coil provided on a primary side with a relatively high voltage and a secondary coil provided on a secondary side with a relatively low voltage; and a current sensor provided on the primary side. The inductance of the current sensor is used as an inductance component of a resonant circuit on the primary side.