Large-power high-frequency excitation source driving circuit and design method thereof

Abstract

The invention discloses a large-power high-frequency excitation source driving circuit and a design method thereof. The driving circuit comprises a signal generator, an isolation module, a first driving module, a second driving module, an MOS1 and an MOS2, wherein the isolation module comprises a first isolation transformer, a second isolation transformer and a fiber isolator; and the signal generator is connected with the first driving module and the second driving module through the isolation module, the first driving module is connected with the MOS1, and the second driving module is connected with the MOS2. According to work parameters of the MOSs, proper MOS specifications are selected; a grid source total charge amount and switching time are determined, and driving currents are calculated; and according to loss of the driving circuit and the driving currents, a driver is selected so that the design of the large-power high-frequency excitation source driving circuit is completed. The driving circuit disclosed by the invention has a quite good high frequency characteristic, can be better adapted to a complex environment detected in a pipeline, and realizes high-frequency driving of an electromagnetic ultrasonic excitation source.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a high-power high-frequency excitation source drive circuit and a design method thereof. Background technique [0002] Since electromagnetic ultrasonic has many advantages such as non-contact, no coupling agent, easy online detection, low requirements on the detection environment, and convenient excitation of various types of ultrasonic waves, it can be used for detection of metal defects in pipelines and special occasions such as high temperature and high speed. Has a wide range of applications. The non-contact characteristics of electromagnetic ultrasound determine the important position of the excitation source used to excite the electromagnetic ultrasonic transducer. The electromagnetic ultrasonic excitation source adopts the DE class RF power amplifier technology, which is a kind of E-class converter working in ZVS. It is a technology formed while retaining the dual-...

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Problems solved by technology

[0003] At present, bootstrap capacitors are mostly used to drive the high-side MOS of DE power amplifiers, but the bootstrap capacitors will fail rapidly due to the increase in frequency, and do not have good high-frequency characteristics, especially when used in pipeline detection, except In addition to factors such as the volume of the excitation source, the heat dissipation and anti-interference ability of the circuit itself need to be considered, and this also increases the requirements for the design of the drive circuit.

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