Power Conversion Apparatus Secondary Side Amplitude Control
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Solution Overview
Problem
Existing power conversion apparatuses experience significant power losses due to circulating currents generated in the inverter circuit when controlling the amplitude of output voltage or current, particularly in full-bridge type inverter circuits.
Innovation Solution
The power conversion apparatus employs a configuration where the control unit manages the switching devices in the secondary side to prevent circulating currents by controlling the amplitude of output voltage or current without relying on the inverter circuit in the primary side, using specific timing controls for the switching devices to maintain zero transformer current during power supply and regeneration modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the inverter circuit controls the amplitude of output voltage or current, then the output amplitude can be adjusted, but circulating currents are generated causing power losses
Solution Approach 1:
The patent extracts the amplitude control function from the inverter circuit on the primary side and relocates it to switching devices on the secondary side. This separation eliminates the source of circulating currents while preserving the amplitude control capability, thereby resolving the contradiction between adaptability and energy loss
Solution Approach 2:
The patent introduces an intermediary control mechanism where the control unit manages secondary side switching devices to achieve amplitude control. This intermediary approach allows control without requiring the primary side inverter to operate in amplitude modulation mode, thus preventing circulating current generation
2Power
If the inverter circuit is used for power conversion, then DC power can be converted to AC power, but circulating currents are generated in the inverter circuit
Solution Approach 1:
The patent segments the power conversion system into distinct functional components: the inverter circuit for basic DC-to-AC conversion and secondary side switching devices for amplitude control. This segmentation isolates the harmful circulating current generation to minimal periods while maintaining continuous power conversion functionality
Solution Approach 2:
The patent employs periodic action by controlling the secondary side switching devices to operate in specific time periods. The switching devices are activated during periods when the transformer current is zero or minimal, creating a periodic pattern that eliminates circulating currents while maintaining power conversion
3Loss of energy
If the switching devices are controlled to prevent circulating currents, then power losses are reduced, but the control complexity increases
Solution Approach 1:
The patent implements feedback control where the control unit monitors transformer current and switching device states to optimize the timing of amplitude control operations. This feedback mechanism automates the complex timing coordination, reducing the perceived control complexity while maintaining the benefit of eliminated circulating currents
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 power losses by eliminating circulating currents in the inverter circuit, allowing for efficient power supply and regeneration modes with minimal wasteful regenerative or supply currents.
Implementation Method 1
a transformer 9 that includes a primary winding 19 and a secondary winding 21, which is magnetically coupled with the primary winding 19
Data Source
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AI summary
A control unit controls the amplitude of at least either an output voltage or an output current by shifting at least either a first on time or a second on time.