Low-power voltage-frequency adjustable inverted sine wave signal source

Abstract

The invention relates to a low-power voltage-frequency adjustable inverted sine wave signal source, which is mainly composed of a signal source controller, an inverting circuit, a digital power amplification circuit, an overcurrent protection circuit, a voltage feedback circuit and a DC power supply, wherein the inverting circuit adopts a 12-bit serial DA converter, and the DA converter receives aserial control signal sent by the signal source controller and generates a controllable DC voltage signal with corresponding amplitude; the DC voltage signal is connected to an analog switch, and a control end of the switch is controlled by a frequency control square-wave signal generated by the signal source controller and outputs a square-wave voltage signal with the same frequency as the control signal and controllable voltage amplitude. The low-power voltage-frequency adjustable inverted sine wave signal source has the remarkable advantages that the output voltage is wide in range and canbe adjusted within 2-115V; the output frequency is wide in range and can be adjusted within 360-10000Hz; the output voltage adopts closed-loop control, and the precision can reach up to 2% under an on-load condition; the circuit devices are compact, and the size is small; and the output power is high and can reach up to 5W.

Description

technical field [0001] The invention relates to the field of low-power AC inverter power supplies, in particular to a low-power voltage-frequency adjustable inverter sine wave signal source. Background technique [0002] The low-power voltage-frequency adjustable inverter sine signal source is a low-power sine wave signal source, which is mainly used in sensor testing equipment such as auto-alignment machines, resolvers, LVDT sensors, RVDT sensors, etc., to provide sine waves for testing signal source. This type of inverter power supply is used to provide sine wave signals of required voltage and frequency during sensor testing, and the signal power requirements generally do not exceed 5W. [0003] At present, the self-aligning machine and the resolver belong to the shaft angle measurement sensor, the voltage range of the excitation power supply is 2~110V, and the frequency range is 400~10000Hz; the LVDT sensor and the RVDT sensor belong to the displacement sensor, and the ...

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Problems solved by technology

[0004] At present, this kind of sine wave signal source is mostly implemented by DC power inverter, but because the sine signal source has a wide voltage range, a large frequency range, and high voltage control accuracy, it is necessary to design a suitable voltage and frequency adjustable inverter circuit, digital power Amplifying circuit, output isolation transformer with filtering function and output signal sampling feedback circuit with high measurement accuracy, to meet the design index requirements of this type of sine wave signal source

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