Multiphase Power Supply Device Phase Control via High Impedance Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing demand for a multiphase power supply device with reduced wiring complexity and miniaturization is hindered by the growing number of phases required to manage power consumption efficiently, leading to layout challenges, increased power consumption, and noise issues due to the limited mounting area on printed circuit boards.
Innovation Solution
A power supply device configuration featuring a common control unit that outputs control signals in phases, enabling the use of a single control signal for PWM control, and incorporating an error amplifier circuit for soft start operations, reduces the number of wirings by using a high impedance detection circuit to manage enable signals and voltage detection, allowing for arbitrary phase changes without increasing wiring complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the number of phases is increased to manage power consumption efficiently and reduce ripple voltage, then power conversion efficiency is improved and ripple voltage is reduced, but the number of wirings and parts increases leading to increased device complexity
Solution Approach 1:
The patent combines multiple drive units (first and second drive units) into a single integrated circuit package, merging their control functions and reducing the number of external wirings required. The control unit integrates PWM control for multiple phases, enabling efficient power conversion while minimizing wiring complexity through functional integration.
2Power
If the number of phases is increased to handle increased current and reduce ripple voltage, then current handling capability is improved, but the mounting area required increases leading to layout challenges
Solution Approach 1:
The patent implements a nested structure where multiple drive units are integrated within a single package, with each drive unit containing power transistors, PWM control circuits, and detection circuits. This nesting approach allows high current handling capability through multiple phases while minimizing the external mounting area by consolidating components internally.
3Measurement precision
If separate control signals are provided to each drive unit for independent PWM control, then control precision is improved, but the number of wirings increases leading to increased device complexity
Solution Approach 1:
The control unit is designed with multi-functionality to generate and output multiple PWM control signals (first PWM control signal and second PWM control signal) through a unified control architecture. This universal control unit maintains precise independent control of each drive unit while reducing wiring complexity by integrating all control functions within the single control unit.
4Reliability
If voltage detection circuits are added to each drive unit for soft start operations, then reliability is improved, but the device complexity increases
Solution Approach 1:
The patent integrates voltage detection circuits within each drive unit to monitor power supply voltage and enable reliable soft start operations. By merging the detection function into the existing drive unit structure, the patent achieves improved reliability without proportionally increasing overall device complexity, as the detection circuits share the same package and control infrastructure.
Data Source
AI summary
The present invention realized miniaturization of a power supply device using a multiphase system. The power supply device includes, for example, a common control unit, a plurality of PWM-equipped drive units, and a plurality of inductors. The common control unit outputs clock signals respectively different in phase to the PWM-equipped drive units. The clock signals are controllable in voltage state individually respectively. For example, the clock signal can be brought to a high impedance state. In this case, the PWM-equipped drive unit detects this high impedance state and stops its own operation. It is thus possible to set the number of phases in multiphase arbitrarily without using another enable signal or the like.