Power Converter Load Voltage Sensing Across a Switching Assembly
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Solution Overview
Problem
Power controllers face challenges in accurately measuring and controlling current and voltage across different voltage zones, particularly in efficiently transferring power to loads while maintaining communication with external systems without voltage level interference.
Innovation Solution
A power controller circuit with a switching assembly, first and second voltage sensors, and a data processing controller that determines load voltage by comparing the voltage received from a voltage source with the voltage drop across the switching assembly, allowing for precise energy control and communication through a common reference potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage sensors are used to measure voltage across different zones, then measurement capability is improved, but device complexity increases due to multiple sensors and reference potential management
Solution Approach 1:
The patent establishes a common reference potential (neutral bus) that connects all voltage sensors to a shared reference point. This allows multiple sensors to operate at different voltage levels (mains voltage zone and load voltage zone) while maintaining measurement accuracy through a unified reference potential, eliminating the need for isolated reference circuits for each sensor.
2Productivity
If a switching assembly is used to control power transfer, then power control capability is improved, but voltage drop across the switch complicates load voltage determination
Solution Approach 1:
The system uses a second voltage sensor to measure the voltage drop across the switching assembly and feeds this information to the controller. The controller then compensates for this voltage drop by calculating the load voltage as the difference between the mains voltage (measured by the first sensor) and the switching voltage drop, thereby maintaining accurate load voltage determination despite the presence of the switching element.
3Adaptability or versatility
If multiple voltage zones are monitored, then system control capability is improved, but communication interference from voltage level differences increases
Solution Approach 1:
The patent introduces a communication circuit that operates through the common reference potential (neutral bus) as an intermediary pathway. This allows the controller to communicate with external systems while referencing the shared neutral potential, thereby enabling multi-zone voltage monitoring without suffering from voltage level interference, as all measurements and communications reference the same potential baseline.
Data Source
AI summary
Determining a load voltage across a load includes receiving electrical energy from a voltage source through a voltage input, transferring at least a portion of the received electrical energy to the load through a voltage output via a switching assembly, and determining a voltage of the received electrical energy via a first voltage sensor coupled to the voltage input. Further included is determining a voltage across the switching assembly via a second voltage sensor coupled to the voltage input and to the voltage output and determining the load voltage based on a comparison of the determined voltage of the received electrical energy with the determined voltage across the switching assembly.