Power Supply Apparatus Ground Potential Compensation
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Solution Overview
Problem
DC/DC power circuits face challenges in maintaining consistent output voltage due to ground potential deviations between the power IC and load sides, resulting in voltage drops that affect the output voltage provided to the load, necessitating a solution for rapid compensation.
Innovation Solution
A power supply apparatus incorporating a low-pass filter and error amplifier with an external terminal for load-side ground potential sensing, which adds the sensed ground potential to a reference voltage to control the output voltage, ensuring it aligns with the load-side ground potential reference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the physical ground is used as both power IC-side ground and load-side ground, then the circuit structure is simple, but the ground resistance causes voltage drop and output voltage deviation when high current flows
Solution Approach 1:
The patent segments the ground reference into two separate terminals: power IC-side ground terminal and load-side ground terminal. This allows independent voltage sensing at each location, eliminating the voltage drop error caused by shared ground resistance while maintaining circuit simplicity.
Solution Approach 2:
The patent introduces an intermediary mechanism (addition circuit) that combines the load-side ground potential with the reference voltage. This intermediary process compensates for ground potential differences without requiring complete ground isolation, balancing simplicity and accuracy.
2Measurement precision
If a compensation function is added to the power IC, then the output voltage accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent merges the ground potential sensing and addition functions into an integrated circuit structure. By combining multiple functions (voltage sensing, addition, and compensation) into a unified power IC design, the patent reduces overall system complexity while maintaining high output voltage accuracy.
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 solution enhances the response speed of the power voltage on the compensation load side, effectively maintaining the configured output voltage value despite ground potential deviations, thereby improving voltage stability and accuracy.
Implementation Method 1
a low-pass filter (LPF) including at least one resistor and at least one capacitor, wherein the LPF inputs an LPF input voltage based on an adding result of the adding portion
Implementation Method 2
an error amplifier, wherein the error amplifier is inputted an LPF output voltage from the LPF as a reference voltage and inputted a feedback voltage based on the LPF output voltage
Data Source
AI summary
The present disclosure provides a power supply apparatus, which provides an output voltage outputted by a DC/DC power circuit to a power supply system of a load and includes: an external terminal which a load-side ground potential is applied to; an adding portion configured for adding the load-side ground potential applied to the external terminal to a set reference voltage; a low-pass filter (LPF) including at least one resistor and at least one capacitor, wherein the LPF inputs an LPF input voltage based on an adding result of the adding portion; and an error amplifier, wherein the error amplifier is inputted an LPF output voltage from the LPF as a reference voltage and inputted a feedback voltage based on the LPF output voltage. The error amplifier is included in the DC/DC power circuit. The output voltage is controlled according to an output of the error amplifier.