Solar air-conditioning system with control and H-bridge inversion circuit

Abstract

The invention discloses a solar air-conditioning system with control and H-bridge inversion circuits. The solar air-conditioning system comprises a solar cell, a solar controller, a storage battery and a variable frequency air conditioner, wherein the solar controller comprises a charging circuit, a control circuit, a lightning protection circuit and a discharging circuit; the variable frequency air conditioner comprises an inversion circuit; the control circuit comprises diodes from the thirty-first to the thirty-third, a thirty-fourth voltage-stabilizing tube, a thirty-seventh voltage-stabilizing tube, a thirty-second resistor, a thirty-first MOS transistor and an integrated voltage-stabilizing chip; the inversion circuit comprises a fifty-first IGBT, a fifty-second IGBT, a fifty-third MOS transistor, a fifty-fourth MOS transistor, diodes from the fifty-first to the fifty-fourth, a fifty-first resistor and a fifty-second resistor. The solar air-conditioning system can effective prevent lightning, improves safety performance of the system, has good self-starting capability, avoids the occurrence of an endless loop state, and has high efficiency no matter a load is in light load operation or full load operation.

Description

technical field [0001] The invention relates to the field of solar air conditioning, in particular to a solar air conditioning system with control and H-bridge inverter. Background technique [0002] The solar air conditioning system is composed of solar cells, controllers, storage batteries and inverter air conditioners. The existing solar air-conditioning system has the following defects: the lightning protection measures of the controller are not effective, which affects the safety performance of the system; the capacity and self-discharge of multiple single batteries of the battery are inevitably inconsistent, which affects the life of the battery. [0003] At the same time, the traditional solar control circuit adopts the method of battery single power supply and low voltage disconnection. In this way, there will be an infinite loop: if the power supply voltage of the battery is lower than the set voltage of the disconnect function, the solar control circuit will be di...

AI Technical Summary

Problems solved by technology

The existing solar air-conditioning system has the following defects: the lightning protection measures of the controller are not effective, which affects the safety performance of the system; the capacity and self-discharge of multiple single batteries of the battery are inevitably inconsistent, which affects the life of the battery

The existing problems are as follows: 1. When IGBT tubes are used, due to the nonlinear characteristics of the IGBT tube conduction voltage drop, the conduction voltage drop of the IGBT tube will not increase significantly with the increase of the conduction current. , the inverter conversion efficiency is higher; on the contrary, due to the nonlinear characteristics of the IGBT conduction voltage drop, the conduction voltage drop of the IGBT tube will not decrease significantly with the decrease of the conduction current. Inverter conversion efficiency is relatively low

On the other hand, due to the low switching frequency of the IGBT tube, the frequency characteristics of the H-bridge inverter circuit composed of the IGBT tube are not ideal.

2. When the MOS tube is used, the frequency characteristic is improved, but because the conduction voltage drop of the MOS tube is linear, the conduction voltage drop of the MOS tube will increase significantly with the increase of the conduction current. When working at full load , the inverter conversion efficiency is low; on the contrary, the conduction voltage drop of the MOS tube will also decrease significantly with the decrease of the conduction current, and the inverter conversion efficiency is relatively high at light load

3. The inverter efficiency will change with the power of the previous DC source

In photovoltaic power generation inverters or wind power generation inverters, the shortcomings of this circuit appear more prominently

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