A low-power voltage-frequency adjustable inverter sine wave signal source

Abstract

The invention is a low-power voltage-frequency adjustable inverter sinusoidal signal source, which is mainly composed of a signal source controller, an inverter circuit, a digital power amplifier circuit, an overcurrent protection circuit, a voltage feedback circuit and a DC power supply; the inverter circuit adopts 12-bit serial DA converter, the DA converter receives the serial control signal sent by the signal source controller, and generates a controllable DC voltage signal of corresponding amplitude; the DC voltage signal is connected to the analog switch, and the control terminal of the switch is controlled by the signal source The controller generates a frequency-controlled square-wave signal for control, and outputs a square-wave voltage signal with the same frequency as the control signal and a controllable voltage amplitude. The invention has the following remarkable advantages: wide output voltage range, adjustable from 2 to 115V; wide output frequency range, adjustable from 360 to 10000Hz; closed-loop control for output voltage, which can reach 2% accuracy under load conditions; compact circuit devices, Small size; high output power, 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 ...

AI Technical Summary

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

Images