Wide-Input DC Control Circuit for Stable PWM Load Driving
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Solution Overview
Problem
Existing circuits for converting alternating current voltage to direct current voltage are limited to specific voltage levels, leading to poor compatibility and low functionality across different power supply voltage levels, failing to meet market demands.
Innovation Solution
A direct-current circuit control system with wide voltage input (80 V-260 V) and low voltage output, incorporating a power supply circuit for rectification, filtering, and stabilization, and a main control circuit with PWM pulse signals to manage multiple loads, including LED and motor control circuits, ensuring adaptability across varying voltage ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different conversion circuits are used for different power supply voltage levels, then voltage conversion can be achieved, but compatibility and functionality deteriorate
Solution Approach 1:
The patent implements a universal AC-DC conversion circuit that can handle multiple input voltage levels (80V-260V AC) through a single design. The circuit uses a bridge rectifier and capacitor filter combination that automatically adapts to different voltage inputs, eliminating the need for separate conversion circuits for different voltage levels. This resolves the contradiction by making one circuit serve multiple voltage conversion functions.
Solution Approach 2:
The patent employs parameter-changing components such as variable resistors and adjustable capacitors that allow the circuit to adapt its operating parameters based on the input voltage level. The feedback control mechanism dynamically adjusts circuit parameters to maintain stable DC output across the wide AC input range, enabling reliable voltage conversion without requiring different circuits for different voltage levels.
2Device complexity
If a fixed voltage conversion circuit is used, then circuit simplicity is maintained, but adaptability to different voltage levels deteriorates
Solution Approach 1:
The circuit design uses universal components and topology that can process a wide range of input voltages. The bridge rectifier configuration and capacitor filtering approach are inherently adaptable to different voltage levels without requiring complex switching or multiple circuit configurations, thus maintaining simplicity while achieving wide voltage adaptability.
Solution Approach 2:
The patent incorporates dynamic adjustment mechanisms including feedback control circuits and adjustable components that allow the fixed circuit structure to adapt its behavior based on input voltage conditions. This enables a physically simple circuit to dynamically respond to different voltage levels, resolving the contradiction between structural simplicity and voltage adaptability.
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 system enhances compatibility by managing multiple voltage levels and prevents stroboscopic issues in LED lighting, enabling wide-range voltage adaptation and improved functionality in electronic devices.
Implementation Method 1
a power supply circuit configured to receive a voltage signal input from a mains supply side and perform rectification, filtering, voltage reduction and voltage stabilization on the input voltage signal
Implementation Method 2
a power supply circuit configured to receive a voltage signal input from a mains supply side and perform rectification, filtering, voltage reduction and voltage stabilization on the input voltage signal
Data Source
AI summary
The present invention relates to the technical field of electronic circuits, and disclosed a direct-current circuit control system with (80 V-260 V) wide voltage input and low voltage output, including a power supply circuit (10) and a main control circuit (20). The main control circuit is configured to output at least four pulse-width modulation (PWM) pulse signals, a power input end of the main control circuit (20) is connected to an output end of the power supply circuit (10) and configured to receive a first voltage signal to control the main control circuit (20) to work and output the PWM pulse signals, and the PWM pulse signals are configured to control work of at least one load.