Anti-electromagnetic interference drive circuit with double inverters

Abstract

The invention discloses an anti-electromagnetic interference drive circuit with double inverters. The drive circuit comprises the first inverter (NOT1), wherein the output end of the first inverter (NOT1) is connected to an IO interface of a DSP, and the output end of the first inverter (NOT1) is connected with the input end of the second inverter (NOT2), and the output end of the second inverter (NOT2) is connected with a switch component; the output end of the first inverter (NOT1) and the output end of the second inverter (NOT2) are connected with a first pull-up resistor (R2) and a second pull-up resistor (R3) respectively, and both the first pull-up resistor (R2) and the second pull-up resistor (R3) are connected with a power source (VCC). The anti-electromagnetic interference drive circuit can play a role of efficient EMI resistance, so that the purpose of preventing an MOS or an IGBT from being switched on and switched off accidentally can be achieved, in addition, the circuit structure is simple, the cost is low, and the needed size is small.

Description

technical field [0001] The invention relates to an anti-electromagnetic interference circuit, in particular to an anti-electromagnetic interference driving circuit applied to a double inverter in a photovoltaic inverter. Background technique [0002] There is usually a drive circuit inside the photovoltaic inverter, which is used to control the on and off of the switching components. The driving signal of the driving circuit is sent by the IO port of the DSP. Generally, the driving circuit is required to send out the driving signal according to the IO port of the DSP during the working process, and accurately control the opening and closing of the switching components to achieve the requirements of the machine. function; however, due to the overlap of high and low voltage or high and low frequency signals inside the photovoltaic inverter, or the layout is not reasonable, the driving signal sent by the IO port of the DSP will be interfered, resulting in the inability to corre...

AI Technical Summary

Problems solved by technology

The driving signal of the driving circuit is sent by the IO port of the DSP. Generally, the driving circuit is required to send out the driving signal according to the IO port of the DSP during the working process, and accurately control the opening and closing of the switching components to achieve the requirements of the machine. function; however, due to the overlap of high and low voltage or high and low frequency signals inside the photovoltaic inverter, or the layout is not reasonable, the driving signal sent by the IO port of the DSP will be interfered, resulting in the inability to correctly control the opening of the switching components and turn off, resulting in damage to switching components or false conduction

Although some of the existing anti-electromagnetic interference drive circuits have achieved the effect of anti-EMI electromagnetic interference, the circuit is complex, the cost of the components used is high, and the required PCB volume is relatively large

Images