Analog circuit and modulation and demodulation method for direct current carrier communication

CN122932727APending Publication Date: 2026-10-16BEIJING DYNAMIC POWER CO LTD
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Patent Information

Application Number
CN202611107596.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-07-24
Publication Date
2026-10-16

AI Technical Summary

Technical Problem

但这类方案硬件架构复杂，外围配套电路器件繁多，不仅硬件采购成本偏高，还对专用芯片存在较强依赖，设备量产与备件供应易受制约

Benefits of technology

[0017]In the modulation stage, digital data is converted into a PWM signal, which, in conjunction with the circuit, generates a high-frequency carrier signal. In the demodulation stage, the carrier voltage is sampled in a rolling manner, time intervals are divided, the absolute value of the voltage difference between symmetrical intervals is calculated, a dynamic threshold is generated, and the data is analyzed by comparing it with a preset threshold. This scheme outputs a volt-level carrier signal, which has stronger anti-interference capability than traditional millivolt-level signals, can adapt to changes in line impedance, and solves the signal attenuation problem in long-distance transmission.

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Abstract

The application discloses a direct current carrier communication analog circuit and a modulation and demodulation method. The direct current carrier communication analog circuit is applied to direct current power line communication between a photovoltaic adapter and a confluence box, and comprises a transmitting circuit and a receiving circuit. The transmitting circuit is arranged on the photovoltaic adapter side and comprises a switching tube and a coupling transformer. A control unit on the photovoltaic adapter side outputs a PWM driving signal, and the PWM driving signal is connected to a control end of the switching tube. A first current end of the switching tube is connected to one end of a primary side of the coupling transformer, and a second current end of the switching tube is grounded. The receiving circuit is arranged on the confluence box side and comprises a carrier sampling unit and a demodulation filter unit. The modulation and demodulation method comprises a modulation step and a demodulation step. The direct current carrier communication analog circuit and the modulation and demodulation method have the beneficial effects of simple circuit structure, low communication cost, large signal amplitude and small long-distance transmission attenuation.
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