Multi-input Single-output Circuit Control Method
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Solution Overview
Problem
Multi-input single-output (MISO) circuits face complexity in active control, which increases the complexity of the control system, making it challenging to efficiently manage multiple input voltage sources and meet different application demands.
Innovation Solution
The implementation of a multi-input single-output circuit with two circuit modules and a control circuit that can switch between linear and switching states based on input voltage sources and control parameters, allowing one module to operate preferentially to improve efficiency and manage load changes effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If active control is used to manage multiple input voltage sources, then the circuit can meet different application demands, but the control system complexity increases
Solution Approach 1:
The circuit automatically selects which input voltage source to use based on voltage level comparison, without requiring complex external control logic. The self-service mechanism uses inherent circuit properties (voltage comparison through resistive dividers and transistor switching) to make the selection decision, eliminating the need for microcontrollers or complex control algorithms.
Solution Approach 2:
The patent introduces intermediate components (resistive dividers, transistors Q1-Q4, and diodes) that mediate between the multiple input voltage sources and the output. These intermediaries perform the comparison and selection function, translating voltage level differences into controlled switching actions without requiring direct complex control logic.
2Productivity
If multiple circuit modules are used to handle different input voltage sources, then the circuit can efficiently manage different applications, but the device complexity increases
Solution Approach 1:
The patent combines multiple circuit modules (first and second circuit modules with different power switch configurations) into a single integrated circuit that handles multiple input voltage sources. The modules share common components (output capacitor C, diode D, inductor L) and are controlled by a unified control circuit, reducing overall complexity compared to separate independent modules.
Solution Approach 2:
The circuit is designed with universal components that serve multiple functions: the same inductor L and output capacitor C are used regardless of which input voltage source is active, and the control circuit can regulate output voltage for both circuit modules. This multi-functionality reduces the need for duplicate components and simplifies the overall device structure.
Data Source
AI summary
A multi-input single-output circuit can include: a first circuit module configured to receive a first input voltage source, and including a first power switch; a second circuit module configured to receive a second input voltage source, and including a switching power converter, where the switching power converter comprises a second power switch; and a control circuit configured to control one of the first and second circuit modules to supply power for a load, or to stop supplying power for the load, according to states of the first and second input voltage sources and control parameters of the circuit module that is in operation.