Pure sine wave inverter with high-frequency chopping, current sampling, voltage stabilizing and isolating functions

Abstract

The invention discloses a pure sine wave inverter with high-frequency chopping, current sampling, voltage stabilizing and isolating functions. The pure sine wave inverter comprises a power supply input module, an input isolation module, a PWM modulation module, a transforming, rectifying and filtering module, an SPWM drive module, an LC filter module, a sine wave generator, an MCU, a voltage sampling module and a current sampling module, wherein the sine wave generator comprises a first reverse-blocking IGBT, a second reverse-blocking IGBT, a third follow current tube, a fourth follow current tube, a 16th resistor, a first inductor and a sixth filter capacitor; and 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. By the pure sine wave inverter, signal interference can be avoided, the condition that an instrument accurately collects data is ensured, the service life can be prolonged, the weight can be reduced, installation is relatively convenient, the application range is not limited, sampling detection of various current values can be achieved, a control signal and a voltage sampling signal can be effectively isolated and the sampling accuracy is improved.

Description

technical field [0001] The invention relates to the field of inverters, in particular to a pure sine wave inverter with high-frequency chopper current sampling, voltage stabilization and isolation functions. 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 ...

AI Technical Summary

Problems solved by technology

[0006] 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

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