AC Transmission Circuit Snubber for Zero-Crossing Surge Control
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Solution Overview
Problem
Existing AC transmission circuits face issues with sudden current changes when the switching device turns off at zero crossing, leading to peak voltage and potential damage or safety hazards.
Innovation Solution
The AC transmission circuit design includes a power supply circuit coupled with a switch circuit that incorporates a main control circuit, surge detection circuit, and a snubber circuit. The main control circuit controls the first switch device, and the snubber circuit compensates for current when the switch device turns off at zero-crossing, preventing sudden current changes and voltage surges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a switching device is used to control the AC transmission circuit, then the control capability is improved, but sudden current changes and peak voltage occur when the switching device turns off at zero crossing
Solution Approach 1:
The control circuit detects the zero-crossing point of the AC current in advance and delays the turn-off signal until the current actually crosses zero, preventing sudden current changes and peak voltage when the switching device turns off
Solution Approach 2:
The control circuit continuously monitors the AC current waveform, detects zero-crossing points, and uses this feedback information to precisely control the turn-off timing of the switching device, ensuring smooth current transition
2Measurement precision
If the switching device turns off at zero crossing, then the control precision is improved, but peak voltage is generated in electrically connected equipment
Solution Approach 1:
A snubber circuit is introduced as an intermediary between the switching device and the load, absorbing the voltage spike and protecting electrically connected equipment from peak voltage damage
3Ease of operation
If a switching device is used in the AC transmission circuit, then the switching control function is improved, but the switching device and connected equipment are prone to damage
Solution Approach 1:
The control circuit detects zero-crossing points in advance and coordinates the turn-off timing, preventing sudden current changes that could damage the switching device and connected equipment
Solution Approach 2:
The snubber circuit acts as a protective intermediary, absorbing voltage spikes and protecting both the switching device and electrically connected equipment from damage
Data Source
AI summary
The present disclosure relates to electronic equipment, and especially relates to an alternating current transmission circuit. The alternating current transmission circuit includes power supply circuit and a switch circuit coupled with the power supply circuit. The switch circuit includes a main control circuit, a surge detection circuit, and a first switch device connected in series in the power supply circuit. The main control circuit is signal connected with the first switch device and configured to control on-off of the power supply circuit by controlling the first switch device. An input terminal of the surge detection circuit is connected with the power supply circuit, and an output terminal of the surge detection circuit is connected with the main control circuit.