Secondary-Side Rectifier With Single Switching Device for Voltage Regulation
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Solution Overview
Problem
Existing secondary-side rectifiers in inductive energy transmission systems require complex configurations and additional components to regulate output voltage, making them bulky, expensive, and inefficient.
Innovation Solution
A secondary-side rectifier with a single controlled switching means that switches between two modes: a conventional full-bridge rectification mode and a voltage doubler mode, allowing for output voltage regulation between two values, thereby replacing the need for a DC/DC converter and reducing reactive power in the resonant circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional B2 bridge rectifier with four diodes and smoothing capacitor is used, then the rectifier structure is simple, but the output voltage cannot be regulated and a DC/DC converter is required for voltage adjustment
Solution Approach 1:
The patent applies dynamics by making the rectifier circuit configurable between two operational modes through a controllable switching element. The switching element can be turned on or off to dynamically change the circuit topology: when off, the circuit operates as a conventional B2 bridge rectifier; when on, it operates as a voltage doubler rectifier. This dynamic reconfiguration enables output voltage regulation without requiring a separate DC/DC converter, thus maintaining structural simplicity while achieving voltage adaptability.
2Adaptability or versatility
If a DC/DC converter is added to regulate output voltage, then voltage regulation is achieved, but the device becomes bulkier and more expensive
Solution Approach 1:
The patent applies universality by designing a rectifier circuit that performs multiple functions using the same basic components. The B2 bridge rectifier structure serves dual purposes: it can operate in conventional full-bridge rectification mode to provide standard rectification, or it can be reconfigured as a voltage doubler rectifier mode to provide voltage multiplication and regulation. The switching element acts as a universal control mechanism that enables both operational modes, eliminating the need for separate voltage regulation stages and reducing overall device complexity.
3Adaptability or versatility
If voltage regulation is implemented using conventional methods, then output voltage can be adjusted, but switching losses increase
Solution Approach 1:
The patent applies periodic action by utilizing the natural oscillating behavior of the resonant circuit in the voltage doubler rectifier mode. The circuit leverages the periodic charging and discharging cycles of the resonant capacitor and the inherent voltage oscillations to achieve voltage multiplication. By synchronizing the switching element's operation with the resonant circuit's natural frequency and phase, the system minimizes forced switching events and associated switching losses, allowing efficient voltage regulation through the periodic energy transfer characteristics of the resonant circuit.
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 efficient regulation of output voltage with minimal components, reducing switching losses and allowing for a smaller, cheaper, and more efficient rectifier design, which can be used in various power transmission systems, including pickups.
Implementation Method 1
The switching means is connected in parallel with one of the diodes of the B2 bridge. When the switching means is open, the parallel diode is not short-circuited, so that the secondary-side rectifier operates like a conventional, uncontrolled B2 bridge rectifier.
Implementation Method 2
The invention relates to a secondary-side rectifier of an inductive energy transmission system, wherein the energy transmission system has a single-phase resonant circuit with at least one inductance and at least one capacitance, which can be magnetically coupled to a primary-side resonant circuit
Implementation Method 3
a single-phase primary-side and a single-phase secondary-side resonant circuit which are magnetically coupled to one another
Implementation Method 4
whose output voltage is smoothed by at least one smoothing capacitor
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a secondary-side rectifier of an inductive energy transfer system, said energy transfer system having at least one single-phase resonant circuit with at least one inductance (L) and at least one capacitance (Cs), which energy transfer system can be magnetically coupled to a primary-side resonant circuit. The secondary-side rectifier comprises a B2 bridge circuit constituted by four diodes (D1, D2, D3, D4), which is connected on the input side to the secondary-side resonant circuit, and the output voltage of which is smoothed by at least one smoothing capacitor (Cgr). The invention is characterized in that a switching device (S) is connected in parallel to a diode (D1, D2, D3, D4), said switching device being capable of short-circuiting the diode (D1, D2, D3, D4) .