Converter Circuit Power Detection Using Time-Averaged Voltage
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Solution Overview
Problem
Power detection in converter circuits is challenging due to variations in input voltage and current, which affect accuracy on both the primary and secondary sides of transformers, making it difficult to obtain reliable power readings.
Innovation Solution
A method that determines time-averaged voltage from a rectified voltage of a transformer winding and multiplies it by a constant based on the average current of the transformer winding, allowing for accurate power output measurement and control, even in applications with varying input conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power is detected on the output side of the transformer, then power output can be monitored, but the power output signal from the transformer is negatively affected
Solution Approach 1:
The patent uses the primary side voltage and current as intermediary measurements to indirectly determine secondary side power, avoiding direct measurement on the output side that would degrade signal quality. The controller circuit measures primary voltage and current, then calculates secondary power using transformer parameters, serving as a mediator between primary measurements and secondary power control.
2Ease of operation
If power is detected on the input or primary side of the transformer, then power monitoring is achieved, but varying input voltages and currents cause inaccurate power readings
Solution Approach 1:
The system implements feedback control by continuously monitoring primary side voltage and current, comparing the calculated secondary power against a reference power level, and adjusting the converter circuit operation accordingly. The controller uses feedback from power detection circuitry to regulate the switching elements, maintaining accurate power control despite input variations.
Solution Approach 2:
The patent dynamically adjusts operating parameters based on detected conditions. The controller modifies switching duty cycles and timing based on primary voltage and current measurements to compensate for input variations. By changing control parameters in response to measured conditions, the system maintains accurate secondary power output despite varying primary side conditions.
Data Source
AI summary
A circuit and method of determining the power output for a converter circuit includes determining a time averaged voltage from a rectified voltage of a winding of the transformer and multiplying the time averaged voltage by a constant determined at least in part by an average current of a winding of the transformer. By one approach, a rectified voltage from a primary side of the transformer is time averaged using a filter circuit. The current can be known or preset or controlled by the converter circuit such that the time averaged voltage reading, assuming a constant current, can be compared to a preset voltage such that the voltage reading approximates a power reading for the transformer. By another approach, the time averaged voltage is multiplied by the current to obtain a power output reading.