Power Factor Correction Device Using Multiplier for Phase Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power factor correction devices using integrators or integrated capacitors have reduced response speed and increased power consumption due to the need for capacitor discharge and larger circuit space, which affects efficiency.
Innovation Solution
A power factor correction device that connects current and voltage compensating circuits to a multiplier to generate an updated reference current signal, eliminating the need for an integrated capacitor, thus enhancing response speed and efficiency by synchronizing alternating current voltage and input current phases using a pulse width modulation signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If an integrator or integrated capacitor is used in the power factor correction device, then the circuit can perform one-cycle control method, but the response speed of the internal circuit is greatly reduced and power consumption is increased
Solution Approach 1:
The patent extracts and removes the integrator and integrated capacitor from the circuit. Instead of using traditional one-cycle control with integration, the invention directly compares the input voltage signal with the current feedback signal to generate PWM control signals, eliminating the components that slow down the response speed and increase power consumption.
Solution Approach 2:
The patent inverts the conventional control approach by not integrating the error signal over one cycle, but rather directly using the instantaneous comparison between voltage and current signals. This inversion of the control method eliminates the need for integration and achieves faster response without sacrificing control capability.
2Power
If an integrated capacitor is used in the power factor correction device, then the circuit can store energy for control, but the circuit space is enlarged and power consumption is increased
Solution Approach 1:
The patent removes the integrated capacitor from the circuit design. The energy storage function previously performed by the capacitor is replaced by direct signal processing using operational amplifiers and comparators that operate without requiring large energy storage components, thereby reducing circuit space.
Solution Approach 2:
The patent replaces the physical energy storage mechanism (capacitor) with an electronic signal processing approach. Instead of storing energy in an electric field and releasing it periodically, the system uses instantaneous electronic comparison and amplification to achieve control, eliminating the need for bulky energy storage components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly increases the response speed of the internal circuit and improves power factor correction efficiency by avoiding the use of integrated capacitors and achieving phase synchronization between alternating current voltage and input current.
Implementation Method 1
The current compensating circuit and the voltage compensating circuit are connected to a multiplier to multiply the compensating voltage signal by the compensating current signal to generate an updated reference current signal
Implementation Method 2
The input alternating current voltage is converted into an input current in accordance with the pulse width modulation signal via the inductor, the power diode and the power transistor
Implementation Method 3
A power factor corrector synchronizes the phases of the input voltage and the input current of an electric appliance
Data Source
AI summary
A power factor correction device comprises a power stage circuit converting input alternating current voltage into input current according to a pulse width modulation signal and outputs the input current to a load generating output voltage on the load, and sampling the input current outputting a correcting current; a current compensating circuit receiving and comparing the correcting current with a reference current signal generating a compensating current signal; a voltage compensating circuit receiving and comparing the output voltage with a reference voltage generating a compensating voltage signal; a multiplication amplifier receiving the compensating current signal and the compensating voltage signal generating an updated reference current signal by multiplying the compensating current signal with the compensating voltage signal; and a pulse width modulation converter receiving the compensating current signal and the compensating voltage signal generating the pulse width modulation signal to synchronize phase of alternating current voltage and input current.