DC-DC Converter Voltage Correction for Cable Drop Compensation
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Solution Overview
Problem
Conventional DC-DC converters require pre-design consideration of load-side resistance values, increasing design complexity and component count, and necessitate continuous detection of output voltage on the load side to maintain constant voltage supply, which burdens system designers.
Innovation Solution
A DC-DC converter with a control circuit that adjusts the switching element based on the potential difference between feedback and reference voltages, incorporating a voltage correction circuit that determines and applies correction based on external load-side resistance information, eliminating the need for pre-design load-side resistance consideration and continuous voltage detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage correction is performed based on pre-set load-side resistance values, then output voltage can be corrected for cable drop, but design complexity and component count increase
Solution Approach 1:
The power supply device automatically detects load-side voltage and performs self-correction of output voltage based on detected values, eliminating the need for pre-set resistance values and manual design calculations. The system serves itself by autonomously adapting to cable drop conditions.
Solution Approach 2:
A feedback mechanism is implemented where the power supply device continuously detects the voltage at the load side and uses this information to adjust its output voltage accordingly. This closed-loop feedback eliminates the need for pre-configured correction values and external adjustment components.
2Reliability
If external adjustment resistors are added for voltage correction, then cable resistance compensation is achieved, but the number of components increases
Solution Approach 1:
The power supply IC is designed to perform multiple functions including voltage detection, cable resistance measurement, and output voltage correction all within a single integrated circuit. This eliminates the need for separate external adjustment resistors and correction circuits.
Solution Approach 2:
The functions of voltage detection, resistance measurement, and voltage correction that were previously distributed across multiple external components are merged into a single integrated power supply device, reducing the total component count.
3Reliability
If continuous voltage detection on load side is implemented, then constant voltage supply is maintained, but system complexity increases
Solution Approach 1:
The power supply device autonomously performs continuous voltage detection and self-correction without requiring external monitoring systems or complex control mechanisms. The single power supply unit serves itself by detecting load voltage and adjusting its output accordingly.
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
The solution automatically corrects reference and feedback voltages, reducing design complexity and component count, allowing constant voltage supply to the load without continuous load-side voltage detection, thereby alleviating designer burden and simplifying system design.
Implementation Method 1
a switching element that applies, to an inductor (coil), a DC voltage supplied from a DC power supply, causes a current to flow, and causes energy to be accumulated in an inductor
Implementation Method 2
a rectifier element that rectifies the current of the inductor in an energy discharge time period during which the switching element is off
Data Source
AI summary
A DC-DC converter that converts a DC input voltage supplied from a DC power supply and that outputs a DC voltage with a different potential is shown. The DC-DC converter includes the following. A control circuit controls a switching element in accordance with a potential difference between a feedback voltage proportional to an output voltage and a predetermined reference voltage. A current supply circuit that causes a predetermined current to flow. A voltage correction circuit that corrects the reference voltage or the feedback voltage. The voltage correction circuit is configured to determine a voltage correction amount, based on information about a resistance on a load side input from outside when a current of the current supply circuit is output, and correct the reference voltage or the feedback voltage.