Secondary-Side Voltage Doubler Rectifier for Inductive Energy Transfer
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Solution Overview
Problem
Existing secondary-side rectifiers in inductive n-phase energy transmission systems require larger capacitors for reactive power compensation, leading to increased volume, weight, and cost due to the square relationship between reactive voltage and the number of turns, while aiming for constant output active power.
Innovation Solution
A secondary-side rectifier design using fewer diodes and a smoothing capacitor, allowing for a star or polygon connection of resonant circuits, which reduces the number of turns and reactive power compensation, achieving twice the output voltage of conventional full-bridge rectifiers with fewer components and smaller capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the number of turns in the winding is increased to maintain constant output active power, then the active voltage increases, but the reactive voltage increases as the square of the number of turns, requiring larger capacitors for compensation
Solution Approach 1:
The patent inverts the conventional rectifier approach by using a voltage doubler circuit topology instead of a standard full-bridge rectifier. This inversion allows the system to achieve the same output active power with reduced number of turns, thereby reducing reactive voltage and capacitor volume requirements
Solution Approach 2:
The patent changes the circuit topology parameters from conventional full-bridge to voltage doubler configuration, and adjusts the resonant frequency and impedance parameters to optimize the relationship between active and reactive power, reducing the capacitor size needed for reactive power compensation
2Power
If the inductance value is increased to maintain output power, then the reactive power increases, but larger capacitors are required for resonance compensation
Solution Approach 1:
The patent inverts the conventional rectifier topology to a voltage doubler configuration, which changes the power transfer characteristics and reduces the inductance value needed for the same output power, thereby reducing the quantity of capacitors required for resonance compensation
3Device complexity
If conventional full-bridge rectifier is used, then the circuit is simple, but the output voltage is lower and requires more turns, increasing reactive power compensation needs
Solution Approach 1:
The patent inverts the conventional full-bridge rectifier topology to a voltage doubler configuration using fewer diodes arranged in a different topology. This inversion achieves higher output voltage with fewer turns, reducing reactive power and capacitor volume despite increased 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 design reduces the volume and weight of the secondary-side energy transmission system, saves costs, and allows for variable output voltage regulation through a DC/DC converter, while maintaining system safety and efficiency by eliminating the need for additional converters.
Implementation Method 1
the secondary-side resonant circuits are magnetically coupled to primary-side resonant circuits
Implementation Method 2
the energy transmission system having a resonant resonant circuit in each strand, each with at least one inductance and at least one capacitance
Implementation Method 3
an induced voltage in the secondary circuit of an air-gap transformer is generally rectified. The resulting direct voltage is then used to supply consumers
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a secondary-side rectifier of an inductive n-phase energy transfer system, N being great than or equal to three and the energy transfer system comprising in every branch (W, V, U) a resonant circuit with at least one inductance (LS) and at least one capacitance (CS) each, and the secondary-side resonant circuits being magnetically couplable to primary-side resonant circuits, the secondary-side resonant circuits being connected in a star connection or in a polygonal connection and being in contact with a rectifier via phase conductors (L1- LN). The invention is characterized in that the rectifier has a series connection of N diodes (D1, Dk,..., DN) having the same forward direction, a smoothing capacitor (Cgr) being connected in parallel to the series connection and the output voltage (UA) of the rectifier being applied to the connecting points (A1, A2) of the smoothing capacitor (Cgr), the phase conductor (Lk) being connected to the anode of the diode (Dk) for all k = 1 to N, the terminal (A1) being in contact with the phase conductor (L1) and the cathode of the Nth diode (DN) being in contact with the connecting point (A2).