Power Management Driver Voltage Sequencing for Mobile PMIC
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Solution Overview
Problem
Power management integrated circuits (PMICs) in mobile devices face increased size and power consumption as the number and size of output voltages increase, complicating the circuit structure and consuming more power.
Innovation Solution
A power management driver with a boost converter, multiple regulators, a sequence controller, and an operation controller that uses a pass transistor circuit and comparator to control the timing and sequence of source drive voltage output, reducing power consumption and simplifying the structure by eliminating the need for additional regulators or converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number and size of output voltages in the PMIC are increased, then the functionality and versatility of the power management driver is improved, but the size of the PMIC and power consumption increase
Solution Approach 1:
The sequence controller pre-establishes the output sequence of multiple voltages before they are needed by the display device. By predicting and preparing the voltage sequence in advance, the system can provide multiple voltages efficiently without requiring additional complex circuitry, thus maintaining versatility while controlling power consumption and size
Solution Approach 2:
The sequence controller is designed to control the output sequence of multiple different voltages (first voltage, second voltage, third voltage, etc.) using a single integrated control mechanism. This multi-functional approach allows one controller to handle various voltage output requirements, replacing what would otherwise require multiple separate voltage generation circuits, thereby reducing overall PMIC size and power consumption while maintaining adaptability
2Ease of operation
If external switching circuits are used to control voltage output sequences, then the sequencing control capability is improved, but the circuit structure complexity increases
Solution Approach 1:
The sequence controller integrates multiple control functions into a single circuit block that can manage the output sequencing of multiple voltages simultaneously. By merging the control of first voltage, second voltage, third voltage and other voltage sequences into one controller, the patent eliminates the need for separate external switching circuits for each voltage, thereby simplifying the overall circuit structure while maintaining full sequencing control capability
Solution Approach 2:
The sequence controller acts as an intermediary between the voltage generation circuits and the display device, centralizing the sequencing control logic in one location. This intermediary approach allows complex voltage sequencing to be managed through a single control interface rather than requiring multiple external switching circuits, reducing circuit complexity while preserving operational capability
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 solution reduces power consumption and simplifies the power management driver structure, improving image output performance and reducing the complexity of the circuit, while maintaining efficient voltage sequencing.
Implementation Method 1
a boost converter to convert an input voltage to a source drive voltage
Implementation Method 2
a plurality of regulators to regulate the source drive voltage to generate a plurality of drive voltages
Implementation Method 3
a comparator to compare a first voltage at the first electrode and a second voltage at the second electrode
Data Source
AI summary
A power management driver includes a boost converter, a plurality of regulators, a sequence controller, and an operation controller. The boost converter converts an input voltage to a source drive voltage for drive a source driver based on a drive enable signal. The regulators regulate the source drive voltage to generate a plurality of drive voltages. The regulators corresponding to a respective number of predetermined devices. The sequence controller controls the timing for providing the source drive voltage to the source driver. The operation controller adjusts active periods of first and second control signals to control the regulators and the sequence controller.