Constant-current current-limiting inverter

Abstract

The invention discloses a constant-current current-limiting inverter. The constant-current current-limiting inverter comprises a voltage booster, an H-bridge circuit, a sampling module, a comparison module and an MCU. The voltage booster is used for increasing the voltage of direct current. The H-bridge circuit is provided with a rectifier filter device and used for converting the direct current output by the voltage booster into alternating current. The sampling module is used for conducting current sampling on the alternating current output by the H-bridge circuit and rectifying the alternating current into a voltage value signal IS which corresponds to voltage of the output end of the H-bridge circuit and is constant in direction. A maximum threshold value and a minimum threshold value are set for the comparison module, and the comparison module judges whether the voltage output by the H-bridge circuit is between the maximum threshold value and the minimum threshold value according to the voltage value signal IS. The MCU controls the H-bridge circuit to be on or off according to output of the comparison module. The constant-current current-limiting inverter has the advantages that the situation that starting power of the H-bridge circuit is affected due to changes in performance of short-circuit protection and overload protection is avoided, the structure is simple, the cost is low, the development cycle is short, the current output is stable, and the constant-current current-limiting inverter can be applied to high-power electrical appliances.

Description

technical field [0001] The invention relates to a power converter, in particular to a constant-current current-limiting inverter. Background technique [0002] The inverter is a device that converts DC power into AC power. According to the control method, the existing inverters can be divided into open-loop control inverters based on 8-bit MCU, and complex multi-closed-loop control inverters based on DSP. There are two types of inverters; DSP multi-change control type inverter, the control process is complex, the output is stable, and the startup ability is strong, but its implementation process is complex, the development cycle is long, and the cost is relatively high; 8-bit MCU is used as the inverse of the core control IC. The inverter is simple to implement and has low cost, but when it is used in high-power electrical appliances, if a large current is to be output normally, the short-circuit protection and overload protection of the inverter will be seriously degraded. ...

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Problems solved by technology

[0002] The inverter is a device that converts DC power into AC power. According to the control method, the existing inverters can be divided into open-loop control inverters based on 8-bit MCU, and complex multi-closed-loop control inverters based on DSP. There are two kinds of inverters; DSP multi-change control inverter has complex control process, stable output, and strong start-up ability, but its implementation process is complicated, the development cycle is long, and the cost is relatively high; 8-bit MCU is used as the inverter of the core control IC. The inverter is simple to implement and low in cost, but when it is used in high-power electrical appliances, if it needs to output a large current normally, the short-circuit protection and overload protection of the inverter will be severely degraded. short-circuit protection, overload protection and other performance of the transformer, it will seriously affect the normal output of current

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