Dual Power Supply Phase Inversion for High-Frequency Voltage Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Capacitor isolation switching power supplies face challenges in reducing high-frequency voltage on the secondary side, which can affect circuit operation, and existing solutions require specific filter design conditions.
Innovation Solution
A power circuit configuration with two power supply units, each including an AC voltage generator, rectification-and-smoothing section, and isolation section with capacitors, where the second AC voltage generator generates an AC voltage phase-inverted relative to the first, effectively canceling out high-frequency voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a capacitor is used to replace an isolation transformer for downsizing, then the power supply size is reduced, but high-frequency voltage is generated on the secondary side that affects circuit operation
Solution Approach 1:
The power supply is divided into multiple independent power supply units, each with its own capacitor-based isolation section. This segmentation allows the high-frequency voltage generated by each unit to be managed separately and combined in a way that achieves cancellation of the harmful effects while maintaining the compact size benefit of capacitor isolation.
Solution Approach 2:
The invention applies preliminary anti-action by generating high-frequency voltages with opposite phases from multiple power supply units before they can cause harmful effects. The control section coordinates the switching sections to create voltages that will cancel each other out, preventing the high-frequency interference from affecting circuit operation while maintaining the downsized capacitor-based design.
2Volume of moving object
If the switching frequency is increased to reduce power supply size, then the capacitor and isolation transformer can be made smaller, but losses due to skin effect and proximity effect in the coil increase
Solution Approach 1:
The power supply system is segmented into multiple independent power supply units, each with its own coil and switching section. This segmentation allows the current in each individual coil to be kept relatively low, reducing skin effect and proximity effect losses, while the overall power transmission capability is maintained through the combined output of multiple units operating at high frequency.
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 high-frequency voltage interference without the need for additional filtering, ensuring stable circuit operation by phase-inverting and canceling out high-frequency voltages across the power supply units.
Implementation Method 1
a first isolation section that includes a capacitor and is provided between the first AC voltage generator and the first rectification-and-smoothing section
Implementation Method 2
the second AC voltage generator generates the AC voltage of which a phase is obtained by inverting a phase of the AC voltage generated by the first AC voltage generator
Data Source
AI summary
A power circuit is provided that includes at least a first power supply unit and a second power supply unit. The first power supply unit includes a first input section, a first AC voltage generator, a first rectification-and-smoothing section, and a first isolation section that is provided between the first AC voltage generator and the first rectification-and-smoothing section. The second power supply unit includes a second input section, a second AC voltage generator, a second rectification-and-smoothing section, and a second isolation section that is provided between the second AC voltage generator and the second rectification-and-smoothing section. The power circuit is configured such that the second AC voltage generator generates an AC voltage having a phase obtained by inverting a phase of the AC voltage generated by the first AC voltage generator.