IRPT5051

The IRPT5051C POWIRTRAIN provides the complete power conversion function for a 15hp (11kW) variable frequency AC motor controller. It contains a 3-phase input rectifier, DC link capacitor, 3-phase IGBT inverter, isolated gate drive circuits, shutdown protection, isolated trip and current feedback signals, and capacitor pre-charge function. Terminal blocks fitted to the POWIRTRAIN allow for end-user input and output connections.

Output power is pulse-width modulated (PWM) 3-phase, variable frequency, variable voltage controlled by externally generated user-provided PWM logic input signals, which control the inverter stage IGBT switching. The PWM input signal terminals and the output feedback signals are optically isolated from the power circuit.

Figure 1 is a block diagram of the IRPT5051C POWIRTRAIN within an AC motor control system. Figure 4 shows the functions and architecture of the IRPT5051C.

The IRPT5051C combines a lower Insulated Metal Substrate (IMS) power board, containing the power semiconductors and a thermistor, with the Driver-Plus Board. The power assembly is designed to be mounted to a heat sink. Figure 2 shows the IRPT5051A power assembly.

The Driver-Plus Board interfaces electrically to the IRPT5051A power assembly via soldered connector pins. All external connections to the POWIRTRAIN are made to terminal blocks on the Driver-Plus Board (figure 3.)