Solar air-conditioning system having charging, controlling and H-bridge inversion functions

Abstract

The invention discloses a solar air-conditioning system having charging, controlling and H-bridge inversion functions. The solar air-conditioning system is composed of a solar battery, a solar controller, a storage battery, and a variable-frequency air conditioner. The solar controller consists of a charging circuit, a control circuit, a lightning prevention circuit, and a discharging circuit. The variable-frequency air conditioner includes an inverter circuit. The control circuit consists of a thirty-first diode, a thirty-second diode, a thirty-third diode, a thirty-fourth voltage-regulator tube, a thirty-seventh voltage-regulator tube, a thirty-second resistor, a thirty-first MOS tube, and an integrated voltage-regulating chip. The inverter circuit includes a fifty-first IGBT tube, a fifty-second IGBT tube, a fifty-third MOS tube, a fifty-fourth MOS tube, a fifty-first diode, a fifty-second diode, a fifty-third diode, a fifty-fourth diode, a fifty-first resistor, and a fifty-second resistor. According to the invention, a lightning prevention effect is good; the system security is improved; the system having low cost and high reliability can be installed conveniently; the system has the excellent self-starting capability; an endless loop state is avoided; and no matter whether the load is in an under-loading working state or a full-load working sate, the efficiency is high.

Description

technical field [0001] The invention relates to the field of solar air conditioning, in particular to a solar air conditioning system with charging, 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] In addition, when there are several consecutive rainy days, the power of the battery is not enough to maintain the work of the powered equipment, which will affect the normal operation of the powered equipment. To solve this problem, the capacity of the battery and solar panels can be increased , so it is i...

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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