Inductorless DC Voltage Step-Down Regulation Circuit

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Solution Overview

Problem

Conventional direct current voltage step-down regulation circuits using switching power supplies and output inductors suffer from slow regulation speed, inductor conduction loss, and limited conversion efficiency, along with complex circuit structures.

Innovation Solution

A direct current voltage step-down regulation circuit structure that employs a switching circuit and feedback regulation circuit without an output inductor, utilizing voltage division by capacitors to achieve fast and efficient voltage regulation, with operational amplifiers and MOS transistors controlling the charging and switching of capacitors to maintain target output voltages.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a switching power supply with output inductor is used for voltage step-down regulation, then voltage regulation can be achieved, but the regulation speed is slow and conversion efficiency is limited due to inductor conduction loss

Engineering Contradiction:

Improveinductor conduction lossVSAvoidregulation speed

Core Design Contradiction:

Loss of energyVSProductivity

Solution Approach 1:

The patent removes the output inductor from the conventional switching power supply circuit, extracting the harmful inductive element that causes conduction loss and slow regulation response. The voltage step-down regulation is achieved through capacitive voltage division instead, eliminating the root cause of the energy loss and speed limitation.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the inductive-based switching regulation mechanism with a capacitive voltage division mechanism. By using capacitors C1 and C2 in series with the output capacitor Co, the system achieves voltage step-down through electrostatic field effects rather than electromagnetic induction, enabling faster response and lower loss.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If an output inductor is used in the switching power supply circuit, then voltage step-down regulation can be performed, but the circuit structure becomes complex and component selection is complicated

Engineering Contradiction:

Improvecircuit structureVSAvoidcomponent selection

Core Design Contradiction:

Device complexityVSEase of manufacture

Solution Approach 1:

The patent extracts and removes the output inductor from the circuit, simplifying the overall structure. By replacing the inductive element with capacitive voltage division components, the circuit becomes less complex and component selection is streamlined, as capacitors are generally more standardized and easier to select than inductors with specific inductance values.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If conventional switching power supply with inductor is used, then voltage regulation is achieved, but conversion efficiency is limited

Engineering Contradiction:

Improveconversion efficiencyVSAvoidinductor conduction loss

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent substitutes the electromagnetic induction-based inductive regulation with electrostatic field-based capacitive voltage division. This replacement eliminates the resistive losses inherent in inductor conduction, achieving higher conversion efficiency through purely capacitive charge transfer and voltage division.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 enables fast regulation speed and high efficiency in voltage step-down, eliminating the need for inductors and simplifying the circuit structure, resulting in reliable and efficient voltage regulation.

Implementation Method 1

utilizing voltage division by capacitors to achieve fast and efficient voltage regulation

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

operational amplifiers and MOS transistors controlling the charging and switching of capacitors

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS11128215B2Direct current voltage step-down regulation circuit structure

Publication Date: 2021.09.21 ZHENGZHOU YUNHAI INFORMATION TECH CO LTD

AI summary

A direct current voltage step-down regulation circuit structure is provided, which includes a switching circuit and a feedback regulation circuit connected to the switching circuit. An output capacitor is arranged at an output end of the switching circuit, and the switching circuit receives an input voltage at an input end thereof. The feedback regulation circuit includes a first operational amplifier, a second operational amplifier and voltage division power supplies. A non-inverting input terminal of the first operational amplifier is connected to a first voltage division circuit. A non-inverting input terminal of the second operational amplifier is connected to a second voltage division circuit. The voltage division power supplies are respectively connected to the first voltage division circuit and the second voltage division circuit.