Output Voltage Detecting Circuit Compensating Cable Voltage Drop
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Solution Overview
Problem
Conventional power supplies require additional load detecting circuits and wires to compensate for conducting voltage drops in power cables, leading to increased complexity, cost, and volume, which is not feasible for small-sized or portable power supplies.
Innovation Solution
An output voltage detecting circuit with a conducting structure, voltage regulator, and resistors generates a compensating voltage to reduce system circuit terminal voltage variations without additional load detecting circuits or wires, using a conducting structure with contacts and resistors to adjust current and generate a detecting signal based on voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power supply uses additional load detecting circuit and detecting wires to compensate for conducting voltage drop, then voltage regulation is improved, but device complexity and volume increase
Solution Approach 1:
The patent merges the load detecting function with the existing output voltage detecting circuit by using the same detecting wire (terminal 22) for both purposes. The voltage regulator circuit integrates both output voltage detection and load current detection functions, eliminating the need for separate load detecting circuits and reducing overall system complexity.
Solution Approach 2:
The detecting wire (terminal 22) is designed to serve multiple functions: it acts as both the output voltage detecting wire and the load current detecting wire. The voltage regulator circuit processes this single wire's signals to derive both voltage and current information, making the detecting infrastructure universal and eliminating additional wire requirements.
2Reliability
If conventional power supply uses additional detecting wires for load detection, then voltage regulation is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the load detecting function with the existing output voltage detecting circuit by using the same detecting wire (terminal 22) for both purposes. The voltage regulator circuit integrates both output voltage detection and load current detection functions, eliminating the need for separate load detecting circuits and reducing overall system complexity.
Solution Approach 2:
The detecting wire (terminal 22) is designed to serve multiple functions: it acts as both the output voltage detecting wire and the load current detecting wire. The voltage regulator circuit processes this single wire's signals to derive both voltage and current information, making the detecting infrastructure universal and eliminating additional wire requirements.
3Reliability
If conventional power supply uses additional detecting wires for load detection, then voltage regulation is improved, but power supply volume increases
Solution Approach 1:
The patent merges the load detecting function with the existing output voltage detecting circuit by using the same detecting wire (terminal 22) for both purposes. The voltage regulator circuit integrates both output voltage detection and load current detection functions, eliminating the need for separate load detecting circuits and reducing overall system complexity.
Solution Approach 2:
The detecting wire (terminal 22) is designed to serve multiple functions: it acts as both the output voltage detecting wire and the load current detecting wire. The voltage regulator circuit processes this single wire's signals to derive both voltage and current information, making the detecting infrastructure universal and eliminating additional wire requirements.
4Power
If power cable has conducting voltage drop, then power transmission is achieved, but system circuit terminal voltage variation increases
Solution Approach 1:
The patent implements a feedback mechanism where the voltage regulator circuit continuously monitors both the output voltage (through voltage dividing resistors R1 and R2) and the load current (through the detecting wire terminal 22). Based on this feedback information and the compensating voltage from conducting structure 110, the circuit dynamically adjusts the power supply output to compensate for conducting voltage drops, maintaining stable terminal voltage.
Solution Approach 2:
The patent introduces a compensating voltage (generated by conducting structure 110 between first contact B1 and second contact B2) as an intermediary element. This compensating voltage represents the conducting voltage drop and is used by the voltage regulator circuit to calculate and compensate for the voltage loss in the power cable, enabling accurate terminal voltage regulation despite cable resistance.
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 effectively compensates for conducting voltage drops, reducing system circuit terminal voltage variations and simplifying circuitry, making it suitable for small-sized or portable power supplies by eliminating the need for additional detecting wires and load detecting circuits.
Implementation Method 1
An output voltage across a positive power output terminal and the power output return terminal is subject to voltage division by the first resistor and the second resistor to generate a divided voltage
Implementation Method 2
The voltage regulator has a ground terminal connected to the first contact of the conducting structure for adjusting a first current according to a voltage across a first circuit terminal and the ground terminal of the voltage regulator, and generating a detecting signal according to the first current
Data Source
AI summary
An output voltage detecting circuit includes a conducting structure, a voltage regulator, a first resistor and a second resistor. The conducting structure includes a power output return terminal, a first contact and a second contact. A compensating voltage is generated between the first and second contacts when an output current flows through the first and second contacts. The voltage regulator adjusts a first current according to a voltage across a first circuit terminal and the ground terminal of the voltage regulator, thereby generating a detecting signal according to the first current. An output voltage across the positive power output terminal and the power output return terminal is subject to voltage division by the first and second resistors to generate a divided voltage. The voltage across the first circuit terminal and the ground terminal of the voltage regulator is equal to a difference between the divided voltage and the compensating voltage.