Commonly Used Inverter Temperature Detection Circuit

Jun. 10, 2019

Here is Rigid Pcb Manufacturer talking about Commonly used inverter temperature detection circuit. 

If you have any idea about Embedded Active Components Pcb, welcome to contact us and discuss.

The temperature detection circuit of common IGBT modules is mostly caused by the internal or external temperature sensor of the module (mostly a negative temperature coefficient thermistor), and a voltage divider circuit of +5V is formed in series with the resistor, thereby converting the temperature change signal into a voltage signal. Directly or after being processed by a voltage follower, it is sent to the MCU pin. The detection signal is an analog voltage signal.

Rigid Pcb Manufacturer

The module temperature detection circuit of the low-power inverter is composed of a temperature sensor and a 555 time-base circuit to form a multi-stable (also called multi-vibrator) circuit. The low-level width of the 3-pin output pulse represents a temperature signal. The temperature detection signal is obtained by D-A conversion of the subsequent stage circuit (MCU).

C37, C38 charging time is determined by R2, D32, the time constant is small, corresponding to the high-level width of the 3-pin output pulse; the discharge time of C37, C38 is determined by the parallel value of RT, R3, the time constant is large, corresponding to 3 The low-level width of the pin output pulse.