ABB for high-voltage inverter IGCT silicon controlled 5SHY4045L0006 3BHB030310R0001

Description

5SHY4045L0006 The experimental setup adopts three-phase inverter, which is powered by AC mains through half wave rectifier. Although the system can use up to 800 V DC bus voltage, the DC bus voltage in this example is 320 V. In normal operation, the 0.5 HP induction motor is driven by an open-loop V/Hz control. IGBT adopts 1200V, 30 AIRG7PH46UDPBF provided by International Rectifier. ADSP-CM408F Cortex with ADI as controller ®- M4F mixed signal processor. Use isolated type Σ-Δ The AD7403 modulator measures the phase current and uses ADuM4135 to realize isolated grid drive (it is a magnetic isolated grid driver product, with 5SHY4045L0006 integrated desaturation detection, Miller clamping and other IGBT protection functions). Short circuit test shall be conducted between motor phases or between motor phases and negative DC bus by manual switch. Short circuit to ground is not tested in this example.

The controller and power panel are shown in Figure 5. They are ADSP-CM408FEZ kit of ADI ® 6 and EV-MCS-ISOINVEP-Z isolated inverter platform.
In the experimental hardware, IGBT over-current and short-circuit protection is realized by various methods. They are:
DC bus current detection (direct fault of inverter)
Motor phase current detection (motor winding fault)
Grid driver desaturation detection (all faults)
For DC bus current detection circuit, a small filter must be added to avoid false triggering, because DC bus current is intermittent due to potential high noise current. With 3 μ RC filter with s time constant. After the overcurrent is detected, the rest of the delay related to IGBT shutdown is through the jump response time in the operational amplifier, comparator, signal isolator, ADSP-CM408F, and the propagation delay of the grid driver. This adds an additional 0.4 μ s. The total time delay from fault to shutdown is 3.4 μ S — Short circuit time constant much lower than that of many IGBTs. Similar timing is also applicable to motor phase current detection using integrated overload detection sinc filter on AD7403 and ADSP-CM408F processors. The adopted time constant is 3 μ The sinc filter around s works well. In this case, the reason for the remaining system delay will only be that the jump signal is internally routed to the PWM unit and there is a grid driver propagation delay, because the overload sinc filter is an internal component of the processor. With the response time of current detection circuit or fast digital filter, no matter what method is used, the ultra short propagation delay of ADuM4135 in both cases is very important to achieve effective fast overcurrent protection. Figure 6 shows the delay between the hardware jump signal, PWM output signal and the actual gate emitter waveform of the IGBT above one of the inverter arms. As can be seen in the figure, the total delay after IGBT starts to shut down is about 100 ns.

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