Voltage Holding Circuit With Bidirectional Conversion for Longer Hold-Up
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Solution Overview
Problem
The increase in costs and sizes of power circuits due to the need for additional capacitance or boost circuits for power-outage holding and low-voltage input compensation contradicts the market trend of smaller sizes and lower costs.
Innovation Solution
A voltage holding circuit with a first energy storage circuit and a voltage conversion circuit that boosts and outputs input voltage to a first energy storage circuit within a threshold range, and outputs the first energy storage voltage to a second energy storage circuit when the input voltage drops, extending the hold-up time without additional components or increased energy storage voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If storage capacitance is increased to achieve power-outage holding, then hold-up time is extended, but costs and sizes of power circuits increase proportionally
Solution Approach 1:
The patent combines the boost circuit and buck circuit into a single integrated voltage conversion circuit that can operate in both modes. The circuit uses a single energy storage inductor and switch configuration that enables both voltage boosting during normal operation and voltage bucking during power-outage holding, thereby extending hold-up time without requiring additional separate circuits or increased capacitance.
Solution Approach 2:
The patent employs dynamic switching between boost mode and buck mode based on real-time voltage conditions. The control circuit dynamically adjusts the operating mode of the voltage conversion circuit: during normal operation it operates as a boost circuit to maintain output voltage, and during power-outage it switches to buck mode to extend hold-up time, thereby adapting to changing conditions without requiring fixed large capacitance.
2Duration of action of moving object
If storage capacitance is increased to achieve power-outage holding, then hold-up time is extended, but costs of power circuits increase proportionally
Solution Approach 1:
The patent combines the boost circuit and buck circuit into a single integrated voltage conversion circuit that can operate in both modes. The circuit uses a single energy storage inductor and switch configuration that enables both voltage boosting during normal operation and voltage bucking during power-outage holding, thereby extending hold-up time without requiring additional separate circuits or increased capacitance.
Solution Approach 2:
The voltage conversion circuit is designed with multi-functionality, serving both as a boost circuit during normal operation and as a buck circuit during power-outage conditions. This universal design eliminates the need for separate dedicated circuits for each function, reducing component count and manufacturing cost while achieving extended hold-up time.
3Use of energy by moving object
If voltage is increased during capacitor discharge to compensate for low-voltage input, then energy storage capability is improved, but boost circuit complexity and size increase
Solution Approach 1:
The patent employs dynamic switching between boost mode and buck mode based on real-time voltage conditions. The control circuit dynamically adjusts the operating mode of the voltage conversion circuit: during normal operation it operates as a boost circuit to maintain output voltage, and during power-outage it switches to buck mode to extend hold-up time, thereby adapting to changing conditions without requiring fixed large capacitance.
Solution Approach 2:
Instead of continuously operating a boost circuit to increase voltage during discharge, the patent inverts the approach by using buck mode (voltage reduction) during power-outage holding. The circuit stores energy at higher voltage during normal operation and then releases it at appropriate voltage levels during power-outage, reversing the conventional wisdom of always boosting voltage during discharge.
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
Effectively extends the hold-up time of the second energy storage voltage, reducing circuit size and cost by using a voltage conversion circuit for both boosting and bucking, saving components and simplifying circuit control.
Implementation Method 1
the voltage conversion circuit receives the input voltage from the second energy storage circuit, boosts and outputs the input voltage to the first energy storage circuit
Implementation Method 2
outputs the first energy storage voltage of the first energy storage circuit to the second energy storage circuit when the input voltage is lower than the first threshold range
Data Source
AI summary
A voltage holding circuit, a voltage holding method, a power circuit and an electronic device are provided. The voltage holding circuit includes a first energy storage circuit and a voltage conversion circuit coupled between the first energy storage circuit and a second energy storage circuit to receive the input voltage from the second energy storage circuit, boost and output the input voltage to the first energy storage circuit when the input voltage is within a first threshold range, and output the first energy storage voltage of the first energy storage circuit to the second energy storage circuit when the input voltage is lower than the first threshold range and/or the drop rate of the input voltage is within a preset threshold range to extend the hold-up time of the second energy storage voltage of the second energy storage circuit within the first threshold range.