Voltage Conversion Device With Dynamic Switch Control
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Solution Overview
Problem
Existing voltage conversion devices suffer from low power factor and high output ripples, leading to inefficient energy conversion and potential flicker issues in loads such as light-emitting diodes.
Innovation Solution
A voltage conversion device with a control unit and transformer configuration that adjusts the switch current and output voltage/current based on sensing signals, using a ratio of transformer windings to optimize power factor and reduce ripples, incorporating a control unit with modules for determining, adjusting, and outputting control signals to manage the switch operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional voltage conversion circuits are used, then the device can convert AC voltage to DC voltage, but the power factor is low resulting in poor voltage conversion efficiency and energy waste
Solution Approach 1:
The patent employs dynamic control of the switch timing and duration based on real-time detection of input voltage waveform and current status. The control unit dynamically adjusts the switch operation parameters to achieve unity power factor, ensuring the input current waveform follows the input voltage waveform, thereby maximizing voltage conversion efficiency and minimizing energy waste.
Solution Approach 2:
The patent implements a feedback mechanism where the control unit continuously monitors the input voltage, input current, and output voltage through detection circuits. Based on this feedback information, the control unit adjusts the switch control signals to maintain optimal operating conditions, ensuring high power factor and efficient energy conversion while compensating for disturbances and parameter variations.
2Reliability
If conventional voltage conversion circuits are used, then the device can provide output voltage to the load, but large output ripples are generated causing flicker in loads like light-emitting diodes
Solution Approach 1:
The patent segments the output filtering function into multiple components working in coordination: the output capacitor provides basic ripple filtering, while the controlled rectifier circuit with multiple diodes and the inductor work together to smooth the output voltage waveform. This segmented approach effectively reduces output ripples and prevents flicker in sensitive loads.
Solution Approach 2:
The patent introduces an intermediary inductor between the rectifier circuit and the output capacitor. This inductor acts as a mediator that smooths current fluctuations and reduces voltage ripples, thereby improving output stability and eliminating flicker effects in LED loads without requiring excessive capacitance.
3Productivity
If the transformer winding ratio is adjusted to improve power factor, then the power factor increases, but the output voltage regulation becomes more complex
Solution Approach 1:
The patent uses dynamic control of the switch timing and pulse width to regulate output voltage, eliminating the need for complex fixed winding ratio transformations. The control unit dynamically adjusts the rectifier operation parameters based on load conditions and input voltage variations, achieving both high power factor and simple output voltage regulation through real-time parameter optimization.
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 and low output ripples, enhancing energy conversion efficiency and stability for loads like light-emitting diodes by dynamically controlling the switch operation based on sensing signals and transformer winding ratios.
Implementation Method 1
The transformer includes a first winding and a second winding... The polarities of the second end of the first winding and the second end of the second winding are identical
Implementation Method 2
The storage inductor includes a first end and a second end, in which the first end of the storage inductor is electrically coupled to the first output end of the input rectifier circuit
Implementation Method 3
The input rectifier circuit includes an input end, a first output end, a second output end, and a ground end, in which the input end receives the input voltage
Data Source
AI summary
A voltage conversion device includes a voltage conversion unit and a control unit. The voltage conversion unit includes an input rectifier circuit, a storage capacitor, a storage inductor, a transformer, a switch, and a rectifier component. A first end of the storage inductor is electrically coupled to a first output end of the input rectifier circuit. A first end of the transformer is electrically coupled to a second output end of the input rectifier circuit. A second end of the transformer is electrically coupled to a second end of the storage inductor. The switch is electrically coupled to a third end of the transformer. The control unit is configured to provide a control signal to the switch according to a current passing through the switch and at least one of an output voltage and an output current.