Power Factor Correction Circuit Pulse Control Method

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Solution Overview

Problem

Conventional methods for varying power factor require modifying hardware designs, making them inconvenient and inefficient, and do not effectively reduce consumption power.

Innovation Solution

A method that uses a bridge rectifier, power factor correction unit, switch unit, and control unit to generate modified conduction pulses, altering the current phase without hardware modifications, resulting in reduced consumption power by adjusting the conduction pulses in an alternating-current voltage apparatus.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional methods modify hardware designs to vary power factor, then power factor can be adjusted, but the method becomes inconvenient and complex

Engineering Contradiction:

Improvepower factor adjustment capabilityVSAvoidhardware design complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent replaces hardware modification (mechanical/electrical system changes) with a control method using pulse width modulation. Instead of physically altering the power factor correction circuit hardware, the invention uses software-based control signals to adjust the conduction time of switches, thereby varying the power factor dynamically without any hardware design changes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the operational parameters (conduction time, pulse width) of the existing power factor correction circuit rather than modifying the hardware itself. By adjusting the conduction time parameter of the switch unit through different pulse widths, the power factor can be varied continuously while keeping the hardware structure unchanged.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If conventional methods modify hardware designs to vary power factor, then power factor correction is achieved, but implementation becomes inconvenient

Engineering Contradiction:

Improvepower factor variation capabilityVSAvoidimplementation convenience

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent replaces complex hardware modification operations with simple control signal adjustments. The control unit generates different width conduction pulses to vary power factor, eliminating the need for physical hardware changes and making the system easy to operate and adapt.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention makes the power factor correction system dynamic and adjustable through control signals. The conduction time of the switch unit can be dynamically changed by modifying the pulse width, allowing real-time power factor adjustment without hardware reconfiguration.

Inventive Principle:

Principle #15Dynamics

3Loss of energy

If the method varies current values to reduce consumption power, then energy consumption decreases, but control complexity increases

Engineering Contradiction:

Improveconsumption powerVSAvoidcontrol complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent uses a simple control unit that generates pulse width modulated signals to control the switch unit. This control method achieves current value adjustment and power reduction through straightforward timing control rather than complex control mechanisms, maintaining low control complexity while effectively reducing energy consumption.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS8488352B1Method for varying power factor

Publication Date: 2013.07.16 CHICONY POWER TECH CO LTD

AI summary

A method for varying power factor is applied to a power factor correction circuit and a rectified voltage. The rectified voltage is transmitted to the power factor correction circuit. The method for varying power factor is to change the conduction pulses of the power factor correction circuit to change the conduction current and the power factor.