Switching frequency switching and data modulation method and control system for peak current control mode

Abstract

The invention discloses a switching frequency switching and data modulation method and control system for peak current control mode, and provides frequency switching and information modulation for a Buck-Boost or flyback circuit that works in DCM and uses peak current control. The method can perform data modulation on the power electronic converter working in the peak current control mode, realize the ripple communication function, and make the converter avoid power disturbance during frequency switching, thereby realizing the decoupling control of power and data. Various data modulation methods can be realized on this basis, including FSK and FH‑DPSK modulation.

Description

technical field [0001] The invention belongs to the technical field of power line carrier communication, and in particular relates to a switching frequency switching and data modulation method and control system for peak current control mode. Background technique [0002] With the development of Internet of Things technology, all kinds of electrical equipment urgently need to realize data communication with other external equipment; in traditional distributed systems, bus communication technologies such as RS485 and CAN are widely used, although the bus communication circuit is simple and the technology is mature. , but requires a separate communication line. In order to simplify the wiring, power line carrier communication technology (PLC) can be used to transmit data. Traditional power line carrier communication generally refers to the use of power lines for data transmission, including communication for high-voltage transmission networks and communication for medium and l...

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Problems solved by technology

[0004] However, the above-mentioned patents and documents are all aimed at converters that adopt the inductor current continuous mode (CCM). If it is directly applied to the inductor current discontinuous mode (DCM) corresponding to CCM, the frequency switching will cause the output voltage to be disturbed. Disturbance will not only affect power control but also interfere with communication; because DCM has the advantage of reducing inductance, and the peak current control method used in conjunction with DCM can simplify the design of control and protection circuits, so use peak current control to work under DCM Converters are widely used in the pursuit of small size, high power density and low cost occasions

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