Inductive Power Feed Device Ripple Reduction
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Solution Overview
Problem
Non-contact charging systems for electric propulsion vehicles face challenges in reducing voltage ripple, leading to increased size, cost, and power loss due to the need for multiple column circuits, which complicates high-speed feedback control.
Innovation Solution
A power feeding device with a power factor improvement circuit, an inverter circuit, and a control circuit that modulates the duty factor or operation frequency of switching elements in synchronization with the AC power supply, reducing the need for additional components and enabling feedforward control to minimize output ripple.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple column circuits are connected in parallel to reduce voltage ripple, then the voltage ripple is reduced, but the parts count, size, cost, and power loss increase
Solution Approach 1:
The patent merges the ripple reduction function into a single column circuit by adding a ripple reduction circuit that shares the smoothing capacitor. This combines multiple functions (power conversion and ripple reduction) into one circuit path, avoiding the need for multiple parallel column circuits while achieving the same ripple reduction effect.
Solution Approach 2:
The smoothing capacitor serves multiple functions: it acts as the output capacitor for the power factor improvement circuit and simultaneously as the energy storage element for the ripple reduction circuit. This multi-functionality eliminates the need for separate capacitors in each parallel column circuit, reducing parts count while maintaining ripple reduction performance.
2Stability of the object's composition
If multiple column circuits are connected in parallel to reduce voltage ripple, then the voltage ripple is reduced, but the size of the power feeding device increases
Solution Approach 1:
The patent merges the ripple reduction function into a single column circuit by adding a ripple reduction circuit that shares the smoothing capacitor. This combines multiple functions (power conversion and ripple reduction) into one circuit path, avoiding the need for multiple parallel column circuits while achieving the same ripple reduction effect.
Solution Approach 2:
The smoothing capacitor serves multiple functions: it acts as the output capacitor for the power factor improvement circuit and simultaneously as the energy storage element for the ripple reduction circuit. This multi-functionality eliminates the need for separate capacitors in each parallel column circuit, reducing parts count while maintaining ripple reduction performance.
3Stability of the object's composition
If multiple column circuits are connected in parallel to reduce voltage ripple, then the voltage ripple is reduced, but the cost of the power feeding device increases
Solution Approach 1:
The patent merges the ripple reduction function into a single column circuit by adding a ripple reduction circuit that shares the smoothing capacitor. This combines multiple functions (power conversion and ripple reduction) into one circuit path, avoiding the need for multiple parallel column circuits while achieving the same ripple reduction effect.
Solution Approach 2:
The smoothing capacitor serves multiple functions: it acts as the output capacitor for the power factor improvement circuit and simultaneously as the energy storage element for the ripple reduction circuit. This multi-functionality eliminates the need for separate capacitors in each parallel column circuit, reducing parts count while maintaining ripple reduction performance.
4Stability of the object's composition
If multiple column circuits are connected in parallel to reduce voltage ripple, then the voltage ripple is reduced, but the power loss increases
Solution Approach 1:
The patent merges the ripple reduction function into a single column circuit by adding a ripple reduction circuit that shares the smoothing capacitor. This combines multiple functions (power conversion and ripple reduction) into one circuit path, avoiding the need for multiple parallel column circuits while achieving the same ripple reduction effect.
Solution Approach 2:
The smoothing capacitor serves multiple functions: it acts as the output capacitor for the power factor improvement circuit and simultaneously as the energy storage element for the ripple reduction circuit. This multi-functionality eliminates the need for separate capacitors in each parallel column circuit, reducing parts count while maintaining ripple reduction performance.
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 output ripple, decreases the parts count and size of the power feeding device, and minimizes power loss, while maintaining efficient power transfer to the receiving device.
Implementation Method 1
a power factor improvement circuit which converts an AC power supply to DC, and improves a power factor
Implementation Method 2
an inverter circuit which includes a plurality of switching elements, and generates an AC signal by switching each of the switching elements using a voltage of the smoothing capacitor as a power supply
Implementation Method 3
a power feeding section which includes a resonant capacitor and a first inductor connected to an output end of the inverter circuit, and feeds power generated between the first inductor and a second inductor provided in the power receiving device to the power receiving device
Data Source
Figure 1
Figure 2~3
Figure 4A~4H
AI summary
A power feeding device (2) of a non-contact charging device (1) includes a power factor improvement circuit (10) which converts an AC power supply (3) to DC, and improves a power factor, a smoothing capacitor (16) connected to an output end of the power factor improvement circuit, an inverter circuit (20) which includes a plurality of switching elements (21, 23, 26, 28), and generates an AC signal using a voltage of the smoothing capacitor as a power supply, a power feeding section (9) which feeds power based on the AC signal to a power receiving device (50), and a control circuit (6) which modulates at least one of a duty factor or an operation frequency of each of the switching elements of the inverter circuit in synchronization with the AC power supply.