Multi-Input Power Supply Sampling Circuit With Resistor Isolation
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Solution Overview
Problem
Conventional multi-input power supply circuits have high structural complexity due to the use of isolators and isolated power supplies, leading to increased costs and reduced reliability.
Innovation Solution
A multi-input power supply circuit utilizing resistors in series for voltage feedback and isolation, along with a control circuit to manage input interfaces, reduces complexity and interference, while maintaining reliability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolators and isolated power supplies are used in the sampling circuit, then voltage sampling and isolation functions are achieved, but circuit structure complexity increases
Solution Approach 1:
The patent extracts the isolation function from complex isolator components and implements it through a simplified resistor-based sampling circuit. The sampling circuit directly connects to the input voltage to obtain feedback signals without requiring separate isolation components, thereby achieving isolation while reducing structural complexity.
Solution Approach 2:
The sampling circuit is designed to perform multiple functions simultaneously: voltage sampling, feedback signal generation, and isolation. By integrating these functions into a single resistor-based circuit rather than using separate components, the patent reduces overall circuit complexity while maintaining reliability.
2Reliability
If conventional sampling circuits with isolators are used, then isolation is provided, but manufacturing costs increase
Solution Approach 1:
The patent replaces expensive isolator components with inexpensive resistor-based sampling circuits. The simplified circuit uses basic passive components that are cheaper to manufacture and assemble, thereby reducing overall manufacturing costs while maintaining the necessary isolation function.
3Measurement precision
If conventional sampling circuits are used, then voltage sampling is achieved, but circuit interference increases
Solution Approach 1:
The patent converts the potential harmful effect of direct connection into a beneficial feature by using the resistor-based sampling circuit to naturally limit current and provide isolation. The sampling circuit's inherent resistance prevents excessive current flow and electromagnetic interference while maintaining accurate voltage sampling capability.
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 proposed solution significantly decreases circuit complexity and costs while improving reliability and flexibility, enabling stable operation and continuous power supply even with varying input voltages.
Implementation Method 1
The at least one resistor is configured to: provide a voltage feedback signal for the control circuit based on voltage values of input voltages of the plurality of input interfaces
Implementation Method 2
The at least one resistor is configured to: provide a function of isolation between the control circuit and the input interfaces
Data Source
AI summary
A multi-input power supply circuit and an electronic device. A sampling circuit of the multi-input power supply circuit includes at least one resistor. The at least one resistor provides a voltage feedback signal for a control circuit of the multi-input power supply circuit based on input voltages of input interfaces of the multi-input power supply circuit, and provides a function of isolation between the control circuit and the input interfaces. The sampling circuit of the multi-input power supply circuit implements input voltage sampling and isolation. In addition, at least a beneficial effect of low complexity of a circuit structure is implemented.