Wide-band excitation signal generator

Abstract

The invention provides a wide-band excitation signal generator, and relates to the field of electronic signal devices. A frequency control word is set through a data interface bus, the working frequency of a DDS generator is configured in a CPLD logic control module, variable-frequency sine wave is output through a DA interface after phase accumulation of signals generated by the DDS generator is carried out according to the set frequency control word, sine wave signals enter a conditioning circuit module for conditioning and filtering, and finally, the sine wave signals pass through a power amplifier circuit module, and excitation signals at a preset frequency are output. According to an isolating and conditioning circuit designed in the invention, a first amplifier improves the signal-to-noise ratio and plays a buffer role, an isolating operational amplifier ensures that the output signals are not affected by common-mode voltage and eliminates electromagnetic interference caused by common ground, and a second operational amplifier improves the output ability. In short, the power amplifier circuit improves the reliability of the system, and makes the system work more stably.

Description

technical field [0001] The invention relates to electronic signal devices, in particular excitation signal generator devices. Background technique [0002] The excitation signal generator is usually used as the test excitation signal source of the resolver, which can generate a high voltage and high current power signal, and its function is to generate a power sine wave with a certain frequency and stable amplitude. The generation methods of traditional excitation signal sources are mostly analog methods or dedicated integrated chips. Although the circuit implementation is relatively simple, the signal frequency generated is single, so that a resolver with a certain frequency can only use an excitation signal generator with a certain frequency, resulting in signal generators There are many categories and poor compatibility, and the signal accuracy, control flexibility, and technical indicators sometimes cannot meet the needs of modern technology. With the improvement of tec...

AI Technical Summary

Problems solved by technology

Although this method can generate multiple frequencies and types of waveform signals at the same time, the signal generation is directly restored by the high-speed DAC chip, and the generated signal power is far from meeting the test excitation signal requirements in the resolver.

In addition, the high-voltage circuit in the excitation signal generator will interfere with the low-voltage control circuit, resulting in system instability. At the same time, the high-voltage and high-current inductive load may generate instantaneous overshoot signals when powering on and off, making the system easy to damage. low reliability

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