Direct-current booster circuit suitable for micro power inversion

Abstract

The invention relates to a direct-current booster circuit suitable for micro power inversion, which comprises two symmetrical push-pull circuits, a rectifier and filter circuit and a PWM generating and voltage stabilizing control circuit. Output results of the two symmetrical push-pull circuits are superposed to generate 380V alternating current; the rectifier and filter circuit rectifies and filters the 380V alternating current to generate 330V direct current; and a second resistor (R2) and a third resistor (R3) in the PWM generating and voltage stabilizing control circuit perform voltage partition on the 330V direct current generated by the rectifier and filter circuit, the partial voltage is compared with a reference voltage stabilized by a voltage stabilizing tube (D1) through a comparator (U1) to output high and low levels, the high and low levels are added to the reverse input end of a differential amplifier (U3) of a PWM controller (U2) through a diode (D2) and an optical coupler (U4), and the stable reference voltage is connected to the positive input end of the differential amplifier (U3). The circuit of the invention has the advantages of simple structure, high conversion efficiency by adopting a booster mode of superposing two groups of push-pull circuits compared with a common fly-back circuit, low parameter requirement for devices and lower production cost.

Description

technical field The invention relates to a DC boost circuit, in particular to a DC boost circuit suitable for micro-power inverter. Background technique Photovoltaic (PV) cells generate direct current, which is stored in the battery by the controller. The battery voltage will fluctuate around 12V with the change of power. Most household appliances require AC 220V power supply, and have high requirements on the amplitude and waveform quality of AC. Traditional inverter devices generally adopt the method of inverting first and then boosting voltage, which has high cost, complicated circuit, difficult debugging and poor waveform quality. The high-frequency inverter device is a device that converts the DC power of the battery into a stable 330V DC power through a DC boost, and then converts it into a 50HZ, 220V AC power through an inverter circuit. The circuit is relatively simple, the cost is low, the digital control method is adopted, the debugging is simple, and the wavefo...

AI Technical Summary

Problems solved by technology

Traditional inverter devices generally adopt the method of inverting first and then boosting voltage, which has high cost, complex circuit, difficult debugging and poor waveform quality

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