NTC Thermistor for Inverter

The Rise of Inverter Market Demand

Since the "United Nations Framework Convention on Climate Change" was proposed in 1992, it was proposed again in the 75th session of the United Nations General Assembly, striving to achieve carbon neutrality by 2060. At present, countries are developing new energy one after another, among which photovoltaic power generation is the most popular and convenient, which makes the demand for inverters show explosive growth

In the conversion circuit of the power supply mode (such as AC→DC, DC→AC), this kind of violent fluctuation of electric energy is the surge impact in electricity, which is an unavoidable objective phenomenon in the circuit work. It affects the power load in the circuit. The impact damage is also real. NTC power type thermistor in the inverter, due to its negative temperature characteristics, can be used to suppress the impact of transient surge current. Protect critical power components and loads to increase service life.

Huge turn-on peaks and turn-off peaks will inevitably occur on the D pole and S pole. Actual tests and theoretical calculations show that the value of this switch peak current (or voltage) will be the maximum value of the switch tube operating current (or voltage). Several times to dozens of times, it is one of the main reasons for the frequent damage of the switch tube.

When the circuit is working, under the action of the PWM pulse, the switch tubes G1~G6 will be turned on or off in turn in a certain order. At this time, the D poles or S poles of these switch tubes will withstand extremely high current spikes. The greater the conversion power of the circuit, the greater the energy fluctuation range. This peak impact strength is greater. At this time, on these key nodes, choose an NTC power type thermistor with appropriate parameters in series, which can absorb most of the high-frequency peak currents that appear at this time, and effectively protect the life of the key switch tubes on the inverter bridge.

In the same way, when the switch tubes are turned on in turn, the energy poured into the transmitter is also fluctuating violently. It is also a very good choice to properly connect an NTC thermistor at point P or Q in the figure. The anti-surge design, which can not only reduce the impact of the peak on the transmitter when the inverter bridge is turned on and off, but also effectively reduce the impact of the surge peak on the transmitter when the output terminal is connected or disconnected from the load.

The power type NTC thermistor for inverters of APEX company, the corresponding specification is MF73, there are many specifications and models to choose from according to the power, and the steady-state current is 2A ~ 80A. The power type NTC thermistor produced by APEX has strong ability to suppress surge current, high maximum capacitance, large B value, small residual resistance and low power consumption.

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