Power Supply Controller Ramp Compensation Integration

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Solution Overview

Problem

Existing methods for forming switching power supply controllers struggle to integrate current sense ramp compensation onto a semiconductor die with a power switching device, particularly in continuous conduction mode, leading to sub-harmonic oscillations in output voltage.

Innovation Solution

A power supply control system that includes a compensation control circuit and a modulation circuit, using a SenseFET type of power transistor to generate a current sense signal, allowing for adjustable current sense ramp compensation by positioning a resistor external to the semiconductor die, thereby facilitating integration and adjustment of compensation without routing the sense current externally.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If current sense ramp compensation is implemented using prior art methods, then sub-harmonic oscillation is prevented, but integration onto semiconductor die with power switching device becomes difficult

Engineering Contradiction:

Improveprevention of sub-harmonic oscillationVSAvoidintegration onto semiconductor die

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent combines the power switching device and compensation control circuit into a single integrated semiconductor die structure. The compensation control circuit is formed directly on the same die as the power switching device, eliminating the need for external discrete components and simplifying manufacturing while maintaining oscillation prevention functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated semiconductor die structure serves multiple functions simultaneously: it acts as both the power switching device and the compensation control circuit. This multi-functional design allows the single device to provide both power switching operation and sub-harmonic oscillation prevention without requiring separate external components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If current sense ramp compensation is provided with external components, then adjustable compensation is achieved, but device complexity and routing requirements increase

Engineering Contradiction:

Improveadjustable current sense ramp compensationVSAvoidexternal component routing

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent integrates the adjustable compensation functionality directly into the semiconductor die by incorporating a programmable logic device or configurable circuitry within the compensation control circuit. This allows compensation adjustment without requiring external resistors or capacitors, reducing device complexity while maintaining adaptability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The compensation control circuit is designed with dynamic configurability, allowing the compensation parameters to be adjusted through programming or configuration modes. This dynamic capability enables the circuit to adapt to different application requirements without changing external hardware components, simplifying the overall device structure.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS7321499B2Method of forming a power supply controller and device therefor

Publication Date: 2008.01.22 SEMICON COMPONENTS IND LLC

AI summary

In one embodiment, a power supply controller uses a ramp signal to form current sense ramp compensation.