Smart Matching Step-Down Circuit for Wide Voltage Conversion
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Solution Overview
Problem
Conventional power conversion devices have a limited applicable range, as they can only convert one fixed power voltage to another, making them inconvenient for use in different countries with varying voltage standards.
Innovation Solution
A smart matching step-down circuit that includes an AC input terminal, a rectifier filter circuit, a switching circuit, a high voltage BUCK control step-down circuit, a floating zero potential control circuit, a voltage detection and feedback circuit, a PWM controller, a full-bridge DC/AC converter circuit, and an output voltage detection circuit, which together enable the conversion of a wide range of AC voltages (90-265V) to a stable AC output (around 110V), suitable for travel-use power conversion devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power conversion device is designed to convert one fixed power voltage to another fixed voltage, then the conversion function is simple and reliable, but the applicable range is limited and cannot adapt to different voltage standards in different countries
Solution Approach 1:
The patent employs dynamic voltage detection and adaptive duty cycle adjustment. The control circuit continuously monitors the input voltage and dynamically modifies the switching duty cycle to maintain stable output across varying input conditions (90-265V AC), transforming a static fixed-ratio converter into a dynamic adaptive system
Solution Approach 2:
The invention changes the operating parameters of the switching circuit based on input voltage conditions. By adjusting the duty cycle ratio of the PWM signal according to detected input voltage levels, the converter adapts its transformation ratio dynamically, enabling wide voltage range compatibility without multiple fixed circuits
2Adaptability or versatility
If the input voltage range is expanded to accommodate different country standards, then the versatility improves, but the control complexity and circuit design difficulty increase
Solution Approach 1:
The patent implements a feedback control mechanism where the output voltage is continuously monitored and fed back to the control circuit. This feedback loop automatically adjusts the PWM duty cycle to maintain stable output voltage regardless of input variations, simplifying the control of wide voltage range operation
Solution Approach 2:
The control circuit automatically detects input voltage conditions and self-adjusts the conversion ratio without external intervention. The system performs self-regulation through integrated voltage detection and adaptive PWM control, reducing the need for complex external control mechanisms
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 smart matching step-down circuit effectively steps down a wide range of input voltages, providing a stable output that is adaptable to various voltage standards, thus enhancing the convenience and applicability of power conversion devices across different regions.
Implementation Method 1
a rectifier filter circuit connects to the AC input terminal for rectifying and filtering waveforms of the first AC to form a first direct current (DC)
Implementation Method 2
a first end of the voltage step-down inductor connects to an output end of the switching circuit, and a second end of the voltage step-down inductor connects to a positive pole of the voltage step-down filter capacitor for performing a voltage step-down process and a filtering process
Data Source
AI summary
Provided is a smart matching step-down circuit, comprising an alternating current input terminal (10), a rectifier filter circuit (20), a switching circuit (30), a high voltage BUCK control step-down circuit (40), a floating zero potential control circuit (41), a voltage detection and feedback circuit (50), a PWM controller (52), a full-bridge DC/AC converter circuit (60), an alternating current output terminal (70), an output voltage detection circuit (62), and a conversion controller (80); the high voltage BUCK control step-down circuit comprises a step-down inductor (L1) and a step-down capacitor (C18); the first end of the step-down inductor is connected to the output terminal of the switching circuit; the second end of the step-down inductor is connected to the positive electrode of the step-down filter capacitor, and is used for stepping down and filtering the pulse voltage, then outputting a second current; the floating zero potential control circuit comprises a flyback diode (D11, D12); the cathode of the flyback diode is connected to the circuit ground, together with the first end of the step-down inductor; the anode of the flyback diode is connected to the floating ground (GND), together with the negative electrode of the step-down filter capacitor; the smart matching step-down circuit can step down a wide voltage, and is broadly adaptable.