Power Factor Correction Device With Current Form Signal
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Solution Overview
Problem
Conventional power supply devices with power factor correction modules experience reduced power factor due to deformation of the input current waveform, especially in the rear part of the half-wave, leading to interference in the supply network and inefficient energy transfer.
Innovation Solution
An electrical supply device with a control module that generates a time-dependent current form signal independently of the input voltage, synchronizing and adjusting the current waveform to match the input voltage, using a smoothing device and active power factor correction to ensure a high and constant power factor, while minimizing harmonics and reactive currents through phase shifting and zero-point zeroing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional power factor correction modules are used, then the power factor is improved, but the input current waveform becomes deformed causing interference in the supply network
Solution Approach 1:
The control module generates the current form signal in advance based on the input voltage waveform, ensuring the PFC device can pre-shape the input current to match the voltage waveform before processing occurs. This preliminary generation of the reference signal enables proactive waveform matching rather than reactive correction.
Solution Approach 2:
The control module continuously monitors the input voltage and dynamically adjusts the current form signal to maintain optimal alignment between input current and voltage waveforms. This feedback mechanism ensures that the PFC device can adapt to varying conditions while maintaining high power factor and minimizing waveform deformation.
2Loss of energy
If the input current is increased to compensate for power factor loss, then the power factor is improved, but harmonics and reactive currents increase causing network interference
Solution Approach 1:
The patent replaces traditional reactive power compensation methods with an active control system that uses electronic switching and pulse-width modulation. The PFC device uses semiconductor switches controlled by the current form signal to actively shape the input current waveform, substituting mechanical or passive reactive compensation with precise electronic control that minimizes harmonics.
Solution Approach 2:
The control module dynamically adjusts the switching parameters and current waveform characteristics based on the input voltage conditions. By changing the timing, amplitude, and shape parameters of the input current through electronic control, the system maintains high power factor while minimizing harmonic content and reactive current components.
3Loss of energy
If active power factor correction is used to adapt phase position, then the power factor is improved, but the device complexity increases
Solution Approach 1:
The control module serves multiple functions: it generates the current form signal, synchronizes with the input voltage, adjusts phase position, and controls the PFC device switching. This multi-functional approach consolidates what could be separate complex subsystems into a single integrated control unit, reducing overall device complexity while achieving active power factor correction.
Solution Approach 2:
The current form signal acts as an intermediary between the input voltage and the PFC device control. Instead of directly controlling the complex switching operations, the control module generates this intermediate reference signal that guides the PFC device to achieve the desired current waveform and phase alignment, simplifying the control architecture.
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 achieves a high power factor of almost 1, reduces current peaks, and improves the overall efficiency and quality of the mains current waveform, even under varying load conditions and frequency changes.
Implementation Method 1
a rectifier (5), which rectifies the input voltage (Uin) into a rectified input voltage (Upfc)
Implementation Method 2
a smoothing device (8) for smoothing the rectified input voltage (Upfc)
Data Source
Figure 1
Figure 2a~2e
Figure 3
AI summary
The object of the present invention is to provide an electrical power supply apparatus which keeps the loading on the power supply system low. To this end, the invention proposes an electrical power supply apparatus, in particular a power supply unit having a power factor correction device 7, wherein the power factor correction device generates a current forming signal from a predefined current forming pattern half-wave.