Gilbert Multiplier Feedback Control for Output Current Accuracy
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Solution Overview
Problem
Current power factor correction circuits, particularly in switch power supply technology, face challenges in achieving accurate output current, which affects the efficiency of power grid energy utilization.
Innovation Solution
A multiplier circuit with a Gilbert multiplier core, differential voltage conversion circuits, and a bias current generating circuit, along with a feedback control unit, is employed to enhance the accuracy of output current by ensuring no current output when the voltage difference is zero, utilizing a current mirror unit and operational amplifiers for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional multiplier circuit is used in the power factor correction circuit, then the circuit structure is simple, but the output current accuracy is insufficient
Solution Approach 1:
The patent introduces a feedback control unit that receives the output current of the multiplier and feeds it back to adjust the differential voltage. This feedback mechanism continuously monitors and corrects the output current, ensuring high accuracy by compensating for any deviations from the desired value, thus resolving the contradiction between simplicity and precision.
Solution Approach 2:
The patent employs differential voltage conversion circuits as intermediary components that transform the relationship between input voltages and output current. These conversion circuits act as mediators that linearize the multiplication process, improving output current accuracy without requiring a fundamentally complex multiplier architecture.
2Measurement precision
If the voltage difference input to the multiplier is zero, then the theoretical output current should be zero, but conventional circuits exhibit offset voltage errors
Solution Approach 1:
The feedback control unit monitors the output current and compares it with the expected value (zero when voltage difference is zero). Any offset voltage error is detected and fed back to adjust the differential voltage, eliminating the error and ensuring the output current remains stable at zero, thus improving both precision and reliability.
Solution Approach 2:
The circuit performs self-correction through the feedback mechanism. When offset voltage errors occur, the system automatically detects and compensates for them without external intervention, maintaining current output stability and accuracy under varying conditions.
Data Source
AI summary
The present invention disclosure provides a multiplier and a power factor correction circuit which the multiplier is applied. The multiplier comprises a Gilbert multiplier circuit comprising a first differential input stage, a second differential input stage and an output stage; a first differential voltage conversion circuit; a second differential voltage conversion circuit; and a bias current generating circuit; Wherein said output stage comprises: a current mirror unit comprising two current input terminals and a current output terminal; and a feedback control unit configured to ensure that the current output terminal does not output current when the voltage difference received by the multiplier is zero. The present invention is advantageous in improving the linearity of the multiplier and the accuracy of the output current of the multiplier output current.