Switch Power Supply IC Adaptive Control Mode

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Solution Overview

Problem

Current switch power supply integrated circuits face challenges in achieving accurate real-time output voltage measurement and low no-load power consumption due to errors in primary constant voltage control mode and high power consumption in secondary constant voltage control mode, which affects dynamic load response and no-load working frequency.

Innovation Solution

An integrated circuit that includes a primary feedback terminal, sampling module, error amplifying module, and control modules to switch between primary and secondary constant voltage control modes based on load conditions, using pulse width or frequency modulation to generate control signals for optimal voltage regulation and low no-load loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If primary constant voltage control mode is used, then output voltage can be regulated, but measurement precision is poor due to sampling errors

Engineering Contradiction:

Improveoutput voltage measurement precisionVSAvoidcontrol accuracy

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent introduces an optocoupler as an intermediary component to transmit feedback signals from the secondary side to the primary side without direct electrical connection. This isolates the sampling circuit from ground potential differences and interference, enabling precise voltage measurement and feedback control while eliminating the measurement errors that plagued the primary constant voltage control mode.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If secondary constant voltage control mode is used, then dynamic load response is improved, but power consumption increases due to analog feedback signals

Engineering Contradiction:

Improvedynamic load response speedVSAvoidno-load power consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent employs periodic pulse signals instead of continuous analog feedback signals. The control circuit generates periodic PWM pulses whose duty cycle encodes the feedback information, allowing the system to achieve fast dynamic response while consuming minimal power during no-load conditions, as the signaling is intermittent rather than continuous.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent replaces the traditional analog feedback mechanism with a digital pulse-based feedback system using optocouplers and PWM modulation. This substitution eliminates the need for continuous analog signal processing, reducing power consumption while maintaining or improving dynamic response characteristics.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If primary constant voltage control mode is used, then circuit structure is simple, but no-load working frequency cannot be controlled to be low

Engineering Contradiction:

Improvecontrol circuit complexityVSAvoidno-load working frequency

Core Design Contradiction:

Device complexityVSSpeed

Solution Approach 1:

The patent implements a dynamic control system that can adaptively adjust the working frequency based on load conditions. The control circuit modifies the switching frequency dynamically - operating at lower frequencies during no-load conditions to reduce power consumption and at higher frequencies under load to maintain regulation performance, thereby resolving the contradiction between simplicity and frequency control.

Inventive Principle:

Principle #15Dynamics

4Adaptability or versatility

If dual control mode is implemented, then performance is improved, but device complexity increases

Engineering Contradiction:

Improvecontrol mode adaptabilityVSAvoidintegrated circuit complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent designs a universal control circuit architecture that can operate in multiple modes (primary constant voltage, secondary constant voltage, and mixed modes) using the same basic components. The integrated circuit incorporates mode-selection logic and configurable parameters that allow a single circuit design to provide versatile control capabilities across different operating conditions, reducing the need for separate dedicated circuits for each mode.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9716438B2Integrated circuit that controls switch power supply and switch power supply

Publication Date: 2017.07.25 BYD CO LTD

AI summary

An integrated circuit controls a switch power supply including: a primary feedback terminal, a primary feedback sampling module, an error amplifying module, a first control module, a secondary control module, a secondary feedback terminal, a second control module, and a driving module; the second control module, connected with the first control module and the secondary control module, respectively, and configured to generate a logic control signal according to the constant voltage control signal, or according to the secondary control signal and the constant voltage control signal; and the driving module, connected with the second control module and configured to generate a driving signal according to the logic control signal and to output the driving signal.