Solar air conditioner system having charging, control and H-bridge inversion

Abstract

The invention discloses a solar air conditioner system having charging, control and H-bridge inversion. The air conditioner 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 prevention circuit and a discharging circuit, the variable frequency air conditioner comprises an inversion circuit, the inversion circuit comprises a fiftieth-first IGBT (Insulated Gate Bipolar Transistor) tube, a fiftieth-second IGBT tube, a fiftieth-third MOS (Metal Oxide Semiconductor) tube, a fiftieth-fourth MOS tube, a fiftieth-first diode, a fiftieth-second diode, a fiftieth-third diode, a fiftieth-fourth diode, a fiftieth-first resistor and a fiftieth-second resistor. By the solar air conditioner system, lightning can be effectively prevented, the safety performance of the system is improved, the activity of the storage battery can be ensured as well as the storage battery is charged, the service lifetime of the storage battery can be prolonged, the charging efficiency of the storage battery can be improved, the power utilization time of the storage battery is prolonged, the solar air conditioner system has favorable automatic-starting capability, an infinite loop state is prevented, and relatively high efficiency is achieved no matter whether a load works in a light-load or heavy-load condition.

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 , but the co...

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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