Digital Error Amplifier Circuit Without External Capacitors

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Solution Overview

Problem

Conventional pulse width modulation (PWM) and pulse frequency modulation (PFM) control systems for error amplification and processing require external capacitors, which increase costs and reduce reliability.

Innovation Solution

A system for error amplification and processing that includes a signal processing unit generating a digital pulse signal based on the difference between a reference signal and a feedback signal, a counter generating a counter output signal, and a digital-to-analog converter generating an output signal, all integrated into a single integrated circuit without the need for external capacitors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If external capacitors are used in conventional PWM/PFM control systems for loop compensation, then system stability can be maintained, but system cost increases and reliability decreases

Engineering Contradiction:

Improvesystem stabilityVSAvoidsystem reliability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent merges the external capacitor function into the integrated circuit by implementing a digital pulse signal generation unit that synthesizes the compensation effect through digital processing. The signal processing unit generates digital pulse signals equivalent to the analog compensation signal that would traditionally require external capacitors, thereby eliminating the need for external passive components while maintaining loop stability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent replaces the analog capacitor-based compensation mechanism with a digital signal processing approach. Instead of using physical capacitors to provide loop compensation, the system uses digital pulse signal generation and processing to achieve the same compensation effect, substituting mechanical/analog components with digital electronics.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Stability of the object's composition

If external capacitors are used in conventional PWM/PFM control systems, then loop compensation can be achieved, but device complexity and component count increase

Engineering Contradiction:

Improveloop compensationVSAvoidcomponent count

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent combines multiple functions (error amplification, loop compensation, and control signal generation) into a single integrated circuit. The signal processing unit performs both error amplification and generates compensation signals through digital pulse generation, eliminating the need for separate external capacitor components and reducing overall device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated circuit performs multiple functions: it amplifies error signals, generates compensation signals through digital pulse generation, and controls the power conversion process. The signal processing unit serves as a multi-functional block that replaces what would traditionally require separate analog components for error amplification and loop compensation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If external capacitors are used for low-bandwidth loop compensation, then precision signal amplification can be achieved, but manufacturing cost increases

Engineering Contradiction:

Improvesignal amplification precisionVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent replaces analog capacitor-based precision amplification with digital signal processing. The signal processing unit uses digital pulse signal generation to achieve precise error amplification and loop compensation, eliminating the need for precision analog components that increase manufacturing cost.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent creates a digital representation of the analog compensation signal through pulse width modulation. The digital pulse signals accurately replicate the compensation effect of external capacitors while being generated entirely within the integrated circuit, reducing the need for external precision components.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS12334886B2Systems and methods for error amplification and processing

Publication Date: 2025.06.17 ON BRIGHT INTEGRATIONS CO INC

AI summary

System and method for error amplification and processing. For example, the system includes: a signal processing unit configured to receive a reference signal and a feedback signal and generate a digital pulse signal, a frequency of the digital pulse signal being associated with a difference between the reference signal and the feedback signal; a counter configured to receive the digital pulse signal and generate a counter output signal based on at least information associated with the digital pulse signal; and a digital-to-analog converter configured to receive the counter output signal and generate an output signal based on at least information associated with the counter output signal.