Pure sine wave inverter with high-frequency chopper current sampling and isolating function

Abstract

The invention discloses a pure sine wave inverter with a high-frequency chopper current sampling and isolating function. The pure sine wave inverter comprises the components of a power input module, an input isolating module, a PWM modulation module, a transformation / rectification / filtering module, an SPWM driving module, an LC filtering module, a sine wave generator, an MCU and a current sampling module. The sine wave generator comprises a first reverse blocking IGBT, a second reverse blocking IGBT, a third freewheeling tube, a fourth freewheeling tube, a sixteenth resistor, a first inductor, a sixth filtering capacitor and a load. The current sampling module comprises a first shunting MOS tube, a second sampling MOS tube, a third sampling MOS tube, a fourth sampling MOS tube, a sampling resistor, a first control resistor and a second control resistor. The pure sine wave inverter has advantages of preventing signal interference, ensuring high accuracy of data which are acquired by an instrument, prolonging service life, reducing weight, realizing relatively convenient mounting, realizing no use range limitation, and realizing sampling on a plurality of current values.

Description

technical field [0001] The invention relates to the field of inverters, in particular to a pure sine wave inverter with the function of sampling and isolating high-frequency chopping current. 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] At present, most of the energy-saving methods of lighting savers on the market are SCR phase-cuttin...

AI Technical Summary

Problems solved by technology

Usually, the current sampling can only have one sampling value

Because only one kind of current can be sampled, there is only one kind of current value that it can detect, and it is not convenient to realize the sampling detection of multiple current values.

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