Voltage Regulator Circuit with Differential Feedback for Load Protection
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Solution Overview
Problem
Conventional voltage generating apparatuses face issues with large differences between limiting current and short circuit current, leading to potential damage to loads due to excessive current flow.
Innovation Solution
A voltage generating apparatus with differential amplification sections and a current detector using series resistors and differential amplifiers to compare and control power source voltage and current, reducing excess current flow by adjusting output voltage and current through addition and amplification sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional current limiting circuit is used, then the limiting current can be controlled, but the difference between limiting current and short circuit current becomes large causing load damage
Solution Approach 1:
The patent implements a feedback mechanism where the current detector continuously monitors the output current and feeds this information back to the differential amplification sections. When the current approaches the limiting current, the feedback signal triggers the amplification sections to reduce the output voltage, thereby limiting the current. This closed-loop feedback ensures the difference between limiting current and short circuit current remains small, preventing load damage while maintaining reliability.
Solution Approach 2:
The patent dynamically changes the output voltage parameter in response to current conditions. The differential amplification sections adjust the output voltage based on the detected current level, transforming the voltage parameter to maintain current within safe limits. This parameter transformation allows precise control of the limiting current while minimizing the difference between limiting current and short circuit current.
2Measurement precision
If multiple differential amplification sections are added, then current and voltage control precision is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into integrated differential amplification sections that simultaneously perform voltage comparison, current detection, and output control. By combining these functions into unified circuit blocks rather than separate components, the patent achieves high measurement precision for current and voltage while minimizing the increase in device complexity. The merged structure allows efficient coordination between detection and control functions.
Solution Approach 2:
The differential amplification sections are designed with multi-functionality, serving as both comparison amplifiers and control elements. Each section can operate in different modes depending on the operating conditions, providing both precise measurement capability and active control function. This universality reduces the need for additional dedicated components, thereby limiting device complexity while maintaining high precision.
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 apparatus effectively limits power source current and voltage with improved precision, reducing the risk of load damage and maintaining stable output within predetermined limits.
Implementation Method 1
a series resistor that is provided on electric wiring between an output of the voltage outputting section and the voltage outputting terminal; and a differential amplifier that detects the power source current by outputting a detecting voltage according to a potential difference between both ends of the series resistor
Data Source
AI summary
There is provided a voltage generating apparatus that outputs a power source voltage from a voltage outputting terminal. The apparatus includes a voltage outputting section that outputs the power source voltage according to a current or voltage to be input, a first differential amplification section that compares the power source voltage and a preset first reference voltage to output a first control current or voltage reducing the power source voltage output from the voltage outputting section when the power source voltage is larger than the first reference voltage and output the first control current or voltage raising the power source voltage output from the voltage outputting section when the power source voltage is smaller than the first reference voltage, a current detector that detects a detecting voltage according to a power source current output from the voltage outputting terminal, a second differential amplification section that compares the detecting voltage detected from the current detector and a second reference voltage to output a second control current or voltage reducing the power source voltage when a value obtained by subtracting the second reference voltage from the detecting voltage is larger, an addition section that inputs a current or voltage obtained by adding the first control current or voltage and the second control current or voltage into the voltage outputting section, and a third differential amplification section that supplies a voltage obtained by amplifying a difference voltage obtained by subtracting the detecting voltage from a preset third reference voltage to the second differential amplification section as the second reference voltage.