Extensible power very low frequency transmitter apparatus and control method thereof

The very low frequency transmitter device, which uses multiple single-unit power cabinets connected in parallel and features a modular design, solves the problems of scalability and single input voltage of existing devices. It achieves AC/DC compatibility, online expansion and replacement, improves the reliability and signal quality of the equipment, and is suitable for field and vehicle environments.

CN122293100APending Publication Date: 2026-06-26BEIJING SHENGFEIFAN ELECTRONIC SYST TECH DEV CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING SHENGFEIFAN ELECTRONIC SYST TECH DEV CO LTD
Filing Date
2024-12-25
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing very low frequency (VLF) transmitter devices suffer from limitations in scalability, online scalability, replaceability, and input voltage type, resulting in restrictions on their use under different operating conditions, weak output signal quality adjustment capabilities, inability to expand the number of switching signal module levels online, and the need to shut down or degrade operation when a fault occurs during operation.

Method used

Multiple single-unit power cabinets are connected in parallel and share a main control system. The modular design is achieved through quick-connect connection. Combined with multi-tap high-frequency transformers and adjustable voltage modules, it supports AC and DC input and has online expansion and replacement functions. It uses interpolation methods to expand the number of pulses and control the dynamic balancing loss of the system, thus achieving modular maintenance.

Benefits of technology

It enables multiple units to be connected in parallel to expand the power level, reduce harmonics, improve the reliability and ease of maintenance of the equipment, supports AC and DC input, is suitable for field and vehicle environments, and ensures the continuity of output signal quality and power.

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Abstract

This invention discloses a scalable power very low frequency (VLF) transmitter device and its control method. It consists of multiple individual cabinets, with multiple units sharing a single main control system, facilitating expansion and allowing for power level adjustments, improved waveform quality, and reduced output waveform harmonics. The input terminals of multiple individual power cabinets can be connected in parallel to DC or AC power supplies, and the output terminals are connected in series to the load. Each cabinet includes a switching module, a voltage conversion module, an adjustable voltage module, multiple switching signal modules, multiple multi-tap high-frequency transformers, and a corresponding number of bypass switches. The unique design of the switching signal modules facilitates online expansion and replacement. The high-frequency transformers are multi-tap high-frequency transformers; adjusting the tap positions allows for graded adjustable output voltage after multiple units are connected in parallel. The main control system includes a command control unit, a stepped waveform generation and expansion unit, a storage unit, and a communication unit. The main control system can multiply the comparison value and pulse quantity based on the individual unit comparison value using interpolation methods to provide pulse signals to the switching signal modules.
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