Pure sine wave inverter with multi-current signal isolation function

Abstract

The invention discloses a pure sine wave inverter with multi-current signal isolation function, which includes a power input module, an input isolation module, a PWM modulation module, a transformer rectification filter module, an SPWM drive module, an LC filter module, and a sine wave generator. device, MCU, voltage sampling module, current sampling module and display module; the current sampling module includes a first shunt MOS tube, a second sampling MOS tube, a third sampling MOS tube, a fourth sampling MOS tube, a sampling resistor, and a first control resistor and the second control resistor; the voltage sampling module includes a rectification circuit, a voltage comparison circuit, a photocoupler, a voltage conversion circuit and a smoothing filter circuit connected in sequence. The pure sine wave inverter with multi-current signal isolation function of the present invention can avoid signal interference, ensure the accuracy of instrument data collection, realize sampling and detection of various current values, effectively isolate control signals and voltage sampling signals, and improve Sampling precision.

Description

technical field [0001] The invention relates to the field of inverters, in particular to a pure sine wave inverter with multi-current signal isolation function. Background technique [0002] An inverter is a device that converts direct current into alternating current. At present, a modified sine wave inverter is used, which is composed of a low-voltage drive control circuit, a pulse width modulation output drive circuit, and an input-output protection circuit. However, this When the waveform generated by the modified sine wave inverter is used for precision instruments, there is no isolation and the signal interference is large, resulting in inaccurate data collection, especially in some medical equipment and military equipment, which have relatively high precision requirements , even a slight disturbance can have serious consequences. [0003] In an integrated circuit, especially in an analog integrated circuit, in order to detect a large current, due to requirements such...

AI Technical Summary

Problems solved by technology

[0005] However, in the existing voltage sampling circuit, the voltage division method is usually used for sampling, and the variables to be sampled are directly sampled, and the control signal of the single-chip microcomputer is not effectively isolated from the voltage sampling signal, thereby affecting the control accuracy. The problem of large sampling errors

Images