Dual-Feedback Power Supply Circuit for PCB Voltage Drop Compensation
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Solution Overview
Problem
Electronic circuits in power supply systems are susceptible to interference and voltage fluctuations due to impedance in printed circuit boards, affecting performance.
Innovation Solution
A power supply circuit with two feedback circuits and a compensation circuit that adjusts input voltage to generate stable output voltage, compensating for voltage drops and ripple using operational amplifiers and resistors to maintain optimal load voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single feedback circuit is used to control output voltage, then the circuit complexity is low, but the output voltage stability is insufficient due to PCB impedance effects
Solution Approach 1:
The feedback control is segmented into two independent circuits: a first feedback circuit that samples the output voltage directly from the power generation circuit, and a second feedback circuit that samples the load voltage at the SOC. Each circuit provides independent feedback signals that are processed separately before being combined to control the power generation circuit, thereby addressing different stages of voltage transmission.
Solution Approach 2:
A compensation circuit is introduced as an intermediary between the two feedback circuits and the power generation circuit. This compensation circuit receives feedback voltages from both feedback circuits, processes them through operational amplifiers and resistors, and generates a compensated control signal that accounts for voltage drops across the PCB trace, thereby mediating the conflict between direct output control and load voltage stability.
2Ease of manufacture
If the conducting wire has non-zero impedance, then the circuit is practical and manufacturable, but voltage drops and ripple affect the load voltage quality
Solution Approach 1:
The patent implements dual feedback loops where the second feedback circuit directly monitors the load voltage at the SOC and feeds this information back through the compensation circuit to adjust the power generation circuit's output. This closed-loop feedback mechanism continuously compensates for voltage drops and ripple caused by the conducting wire's impedance, maintaining high load voltage quality despite practical PCB trace limitations.
Data Source
AI summary
A power supply circuit providing power to a system on chip (SOC) is provided. A power generation circuit adjusts the input voltage according to the first feedback voltage to generate an output voltage. A first feedback circuit is coupled to the power generation circuit and generates the first feedback voltage according to the output voltage. A conducting wire is coupled between the power generation circuit and the SOC to receive the output voltage. The conducting wire uses the output voltage as a load voltage and provides the load voltage to the SOC. A second feedback circuit generates a second feedback voltage according to the load voltage. A compensation circuit adjusts the first feedback voltage according to the second feedback voltage. In response to the second feedback voltage being higher than a first reference voltage, the compensation circuit increases the first feedback voltage.