Dielectric Ceramic Capacitor for Voltage Regulator Temperature Compensation
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Solution Overview
Problem
Current capacitors used in voltage regulators for notebook computers experience errors in detected output voltage due to varying inductor resistance with temperature, requiring NTC thermistors for correction, and lack capacitors with large absolute value of capacity temperature characteristic within a wide temperature range.
Innovation Solution
A dielectric ceramic composition with a main component expressed by the formula (Ba1-x-ySrxCay)m(Ti1-zZrz)O3, including subcomponents like Mg oxide, oxides of Mn and Cr, R oxides (Y, La, Ce, etc.), and Si oxides, which provides a capacitance change rate within -15 to +5% over -25 to 105°C, eliminating the need for NTC thermistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a normal capacitor with small capacity temperature characteristic is used, then capacitance stability is maintained, but the ability to revise detection errors in voltage regulators is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters of the dielectric ceramic, specifically the ratios of Ba, Sr, Ca, Ti, and Zr elements along with controlled amounts of Mn, Cr, and Si additives. By adjusting these compositional parameters within specific ranges, the capacitor achieves a capacity temperature characteristic of -3000 to -7000 ppm/°C, which provides the necessary detection error revision capability while maintaining acceptable capacitance stability across the operating temperature range of -25 to 105°C.
Solution Approach 2:
The patent employs composite materials by combining multiple oxide components in a specific formulation: (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 as the base dielectric with controlled additions of Mn oxide (0.01-5 wt%), Cr oxide (0.01-5 wt%), and Si oxide (0.1-10 wt%). This composite approach enables the material to exhibit enhanced capacity temperature characteristic for error correction while maintaining structural integrity and functional stability.
2Measurement precision
If a capacitor with large absolute value of capacity temperature characteristic is developed, then detection error revision capability is improved, but manufacturing complexity increases due to precise composition requirements
Solution Approach 1:
The patent establishes specific parameter ranges for each compositional element to achieve the desired -3000 to -7000 ppm/°C capacity temperature characteristic. By defining clear boundaries for Ba (40-70 wt%), Sr (5-30 wt%), Ca (0-10 wt%), Ti (20-40 wt%), Zr (0-15 wt%), and trace additives, the invention makes the manufacturing process controllable and repeatable, reducing complexity while maintaining the error correction functionality.
Solution Approach 2:
The patent applies local quality by introducing small, controlled amounts of specific additives (Mn: 0.01-5 wt%, Cr: 0.01-5 wt%, Si: 0.1-10 wt%) into the bulk dielectric material. These localized compositional modifications at specific sites within the ceramic structure enable precise control over the capacity temperature characteristic without requiring complete restructuring of the entire material system, thereby simplifying manufacturing.
3Measurement precision
If NTC thermistor is used to revise detection error, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies universality by designing a dielectric ceramic capacitor that performs multiple functions: it serves as both the standard capacitance element in the voltage regulator circuit and as the temperature compensation component for detection error correction. This multi-functional capacitor eliminates the need for separate NTC thermistor components, thereby reducing device complexity and component count while maintaining detection accuracy.
Solution Approach 2:
The patent merges the functions of the capacitor and temperature compensation elements into a single component. By incorporating temperature compensation characteristics directly into the dielectric ceramic composition, the invention combines what would traditionally require separate capacitor and NTC thermistor components into one integrated element, simplifying the overall device structure and reducing cost.
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 dielectric ceramic composition achieves a large absolute value of capacity temperature characteristic, reducing the need for NTC thermistors and offering cost advantages while maintaining capacitance stability across a wide temperature range.
Implementation Method 1
showing large absolute value of capacity temperature characteristic within a wide temperature range
Data Source
AI summary
The present invention relates to a dielectric ceramic composition comprisinga main component expressed by a general formula:(Ba1-x-ySrxCay)m(Ti1-zZrz)O3,a first subcomponent comprising Mg oxide,a second subcomponent comprising at least one kind of oxide selected from oxides of Mn and Cr,a third subcomponent comprising R oxide (note R is selected at least one kind from Y, La Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho and Yb), anda fourth subcomponent comprising an oxide including Si.