AC/DC Converting Circuit Automatic Voltage Switching
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Solution Overview
Problem
Conventional AC/DC converting circuits in motor controllers are complex, expensive, and prone to safety issues due to manual switching between full-bridge rectifiers and double-voltage circuits, which can lead to output voltage instability and damage.
Innovation Solution
A cost-effective AC/DC converting circuit with a full-bridge double-voltage circuit, featuring a bidirectional triode thyristor electronic switch, a hysteresis loop comparison trigger circuit, and a detecting circuit with resistors, enabling automatic switching between full-bridge rectifier and double-voltage modes, ensuring stable output voltage and improved safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual switching between full-bridge rectifier and full-bridge double-voltage circuit is used, then circuit functionality is achieved, but circuit complexity and cost increase
Solution Approach 1:
The patent combines the full-bridge rectifier and full-bridge double-voltage circuit into a single integrated circuit structure. The four switching elements (Q1-Q4) form both circuit configurations simultaneously, allowing automatic switching between modes without external manual intervention. This merging eliminates the need for separate manual switching mechanisms, reducing overall circuit complexity while maintaining both functional modes.
Solution Approach 2:
The circuit employs automatic switching through voltage detection and control logic that responds to input voltage conditions. The detecting circuit monitors the AC input voltage, and when voltage drops below a threshold, the control circuit automatically activates the appropriate configuration. This self-service mechanism eliminates manual switching operations, reducing complexity and improving reliability.
2Ease of operation
If manual switching is used, then circuit operation is possible, but safety and reliability deteriorate due to erroneous switching
Solution Approach 1:
The detecting circuit continuously monitors the AC input voltage and provides feedback to the control circuit. When the detected voltage falls below the preset threshold, the control circuit automatically switches to the full-bridge double-voltage circuit configuration. This closed-loop feedback mechanism ensures accurate and reliable switching based on actual voltage conditions, eliminating erroneous manual switching and improving circuit safety.
Solution Approach 2:
The circuit performs automatic self-switching based on detected voltage conditions without requiring manual intervention. The control circuit autonomously determines when to switch between full-bridge rectifier and full-bridge double-voltage configurations, eliminating human error and improving reliability. The system serves itself by monitoring and adjusting its own operation based on input conditions.
3Power
If conventional AC/DC converting circuit is used, then power conversion is achieved, but component size and cost increase
Solution Approach 1:
The patent merges the functionality of separate full-bridge rectifier and full-bridge double-voltage circuits into a single integrated structure. The same four switching elements (Q1-Q4) and capacitors (C1-C2) serve dual purposes in both circuit configurations. This consolidation reduces the number of discrete components needed compared to conventional designs that would require separate circuits for each mode, thereby reducing component size and cost while maintaining full power conversion capability.
Data Source
AI summary
An AC/DC converting circuit, has a full-bridge rectifier having two input terminals and two output terminals, a first capacitor, a second capacitor, an electronic switch having a control terminal, a trigger circuit having an input terminal and an output terminal, and a detecting circuit having an input terminal and an output terminal. The first capacitor and the second capacitor are serially connected between the output terminals of the full-bridge rectifier, the input terminals of the full-bridge rectifier are connected to an AC input, one end of the electronic switch is connected between the first capacitor and the second capacitor, the other end of the electronic switch is connected to one of the output terminals of the full-bridge rectifier, the input terminal and the output terminal of the detecting circuit are connected to the output terminals of the full-bridge rectifier, the output terminal of the detecting circuit is connected to an input terminal of the trigger circuit, and the output terminal of the trigger circuit is connected to the control terminal of the electronic switch.