Ring-Connected Power Supply Unit for Cost Reduction
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Solution Overview
Problem
Existing multiphase power supply techniques require a master IC and multiple slave ICs, leading to increased costs and complexity, particularly in compact devices like notebook PCs, where reducing the number of components and interconnect wires is essential.
Innovation Solution
A power supply unit configuration using a ring-connected semiconductor devices with built-in inductors and a shared error amplifier signal, eliminating the need for a master IC and reducing the number of terminals and wirings, allowing for multiphase power supply operation at lower costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a master IC and multiple slave ICs are used for multiphase power supply control, then the power supply control function is achieved, but the device complexity and cost increase
Solution Approach 1:
The patent combines the master IC and slave ICs into a single integrated semiconductor device. The control circuit includes a master control unit and slave control units that are integrated on the same chip, eliminating the need for separate master IC and slave ICs. This merging reduces the total number of components while maintaining the multiphase power supply control function through internal signal routing between master and slave control units.
Solution Approach 2:
The single semiconductor device performs multiple functions: it acts as both the master controller and slave controllers simultaneously. The control circuit can operate in different modes (single-phase or multiphase) by configuring the connection between master and slave control units, providing universal functionality for various power supply requirements without needing different hardware configurations.
2Device complexity
If multiple slave ICs are connected to the master IC, then multiphase power supply is achieved, but the number of interconnect wires increases
Solution Approach 1:
The slave control units are nested within the same semiconductor device as the master control unit. The control circuit is structured with the master control unit containing or closely integrated with multiple slave control units, allowing phase timing signals to be generated and distributed internally without requiring external interconnect wires between separate ICs.
Solution Approach 2:
The patent transitions from a distributed architecture (multiple separate ICs connected via wires) to an integrated architecture (multiple control units on a single chip). This dimensional change from external connections to internal integration eliminates the need for numerous interconnect wires while maintaining the multiphase power supply capability through on-chip signal routing.
3Area of stationary object
If separate master IC and slave ICs are used, then phase control is achieved, but the mounting area increases
Solution Approach 1:
The master IC and slave ICs are merged into a single semiconductor device, reducing the mounting area from multiple discrete components to one integrated chip. This consolidation maintains all necessary control functions while occupying significantly less board space, which is critical for compact electronic devices.
Solution Approach 2:
While integrated, the control circuit is segmented into distinct master and slave control units with specific functions. This functional segmentation allows the single device to perform complex multiphase control operations while maintaining a compact form factor, as each segment is optimized for its specific role rather than requiring separate physical ICs.
Data Source
AI summary
To provide a power supply unit capable of realizing a multiphase power supply at low cost. For example, each of a plurality of semiconductor devices DEV[1]-DEV[n] comprises a trigger input terminal TRG_IN, a trigger output terminal TRG_OUT, and a timer circuit TM that delays a pulse signal input from TRG_IN and outputs it to TRG_OUT. DEV[1]-DEV[n] are mutually coupled in a ring shape by its own TRG_IN being coupled to TRG_OUT of one semiconductor device other than itself. Each of DEV[1]-DEV[n] performs switching operation by using the pulse signal from TRG_IN as a starting point, and feeds a current into an inductor L corresponding to itself. Moreover, DEV[1] generates the above-described pulse signal only once during startup by a start trigger terminal ST being set to a ground voltage GND, for example.