PMIC Time-Division Voltage Control for Leakage Prevention

Solution Overview

Problem

Conventional power management integrated circuits (PMICs) cannot output different DC voltage levels without additional control circuits and increased space on printed circuit board assemblies (PCBAs), which is necessary for controlling low voltage levels during startup and image detection, leading to potential local oscillator leakage and compromised image quality.

Innovation Solution

A PMIC with a DC voltage output unit that generates and outputs different DC voltages in a time-division manner using a multiplexer and delay circuit, allowing for control of low voltage levels without external circuits or increased space, utilizing a bandgap reference voltage source and operation amplifier for efficient voltage switching.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If additional control circuits are added to the PCBA to output different DC voltage levels, then the ability to control low voltage levels during startup and image detection is improved, but the device complexity and space requirements increase

Engineering Contradiction:

Improvevoltage level control capabilityVSAvoidPCBA circuit complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the voltage control functionality into the PMIC itself by integrating a multiplexer and delay circuit within the chip. This combines the functions of voltage generation, switching, and timing control into a single integrated component, eliminating the need for separate external control circuits on the PCBA while maintaining the ability to output different DC voltage levels for startup and operation phases

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The PMIC is designed with multi-functionality to handle both startup and operation phases. The multiplexer allows the single PMIC to selectively output different voltage levels (first DC voltage during startup, second DC voltage during operation) based on timing signals, making one device perform multiple voltage control functions that would otherwise require separate circuits

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If additional control circuits are added to the PCBA to output different DC voltage levels, then the ability to control low voltage levels during startup and image detection is improved, but the area occupied on the PCBA increases

Engineering Contradiction:

Improvevoltage level control capabilityVSAvoidPCBA space

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent merges the voltage control functionality into the PMIC itself by integrating a multiplexer and delay circuit within the chip. This combines the functions of voltage generation, switching, and timing control into a single integrated component, eliminating the need for separate external control circuits on the PCBA while maintaining the ability to output different DC voltage levels for startup and operation phases

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The control circuits (multiplexer, delay circuit, operation amplifier) are nested within the PMIC package. By placing these previously external components inside the integrated circuit, the patent eliminates the need for additional PCBA space while preserving full voltage control functionality during startup and operation

Inventive Principle:

Principle #7Nested doll (Nesting)

3Device complexity

If the PMIC outputs identical DC voltage levels, then the circuit design is simplified, but local oscillator leakage occurs at startup and image quality deteriorates

Engineering Contradiction:

ImprovePMIC circuit simplicityVSAvoidlocal oscillator leakage

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The delay circuit generates a delayed clock signal that controls the multiplexer to output the first DC voltage during the startup phase before the local oscillator is fully operational. This preliminary voltage control prevents oscillator leakage from affecting the image sensor during startup, and the circuit automatically transitions to the second DC voltage during normal operation when the oscillator is stable

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The PMIC transitions from a static voltage output design to a dynamic one using a multiplexer controlled by clock signals. The output voltage level changes dynamically based on the timing relationship between the first and second clock signals, allowing the system to adapt voltage levels according to operational phase (startup vs. operation) to prevent oscillator leakage while maintaining circuit simplicity

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10026376B2Power management integrated circuit and display device

Publication Date: 2018.07.17 BOE TECHNOLOGY GROUP CO LTD

AI summary

The present disclosure provides a power management integrated circuit (PMIC) and a display device. The PMIC includes an FBN and a DC voltage output unit configured to output different DC voltages to the FBN in a time-division manner.