“The power supply system of household appliances usually requires high efficiency, stable performance and low power consumption. Therefore, the relationship between the three main characteristics of saturation voltage drop, switching speed and safe operating area needs to be adjusted. IPM has these technical characteristics. There are gate drive control circuit fault detection and various protection circuits inside the IPM, and IGBT chips with current sensors are used. The internal fault protection circuit is used to detect faults such as overcurrent, overheating and undervoltage.
“
The power supply system of household appliances usually requires high efficiency, stable performance and low power consumption. Therefore, the relationship between the three main characteristics of saturation voltage drop, switching speed and safe operating area needs to be adjusted. IPM has these technical characteristics. There are gate drive control circuit fault detection and various protection circuits inside the IPM, and IGBT chips with current sensors are used. The internal fault protection circuit is used to detect faults such as overcurrent, overheating and undervoltage. When an abnormal operating state occurs, the IPM will automatically shut down and send a fault signal to the control board through the photoelectric sensor of the drive interface.
Internal composition of IPM:
The IPM has built-in drive and protection circuits to prevent systems from interfering with each other or outdated damage to the power chip. As long as a protection circuit is active, the gate drive circuit of the IGBT is turned off, and a fault signal is generated at the same time. It adopts the fault detection and shutdown method to make maximum use of the capacity of the power chip.
1) Short circuit protection:
When the load is short-circuited or the system controller has a shoot-through phenomenon due to mutual interference, the short-circuit protection circuit in the IPM will turn off the IGBT. When the current flowing through the IGBT exceeds the current disconnection threshold (SC), it starts to turn off immediately and generates a fault signal.
2) Over current protection:
If the current in the IGBT exceeds the overcurrent turn-off threshold (OC) for a duration greater than toff(oc), the IGBT turns off. A typical value of toff(oc) is 10 μs. When the current is above OC but the duration is less than toff(oc), the overcurrent protection circuit does not work. The IPM uses an IGBT with a current sensor to detect the actual current of the device.
3) Control power supply under voltage lockout:
The internal control circuit is powered by a 15V DC power supply. For whatever reason, as long as the supply voltage falls below the undervoltage shutdown threshold (UV), the IPM turns off and a fault signal is generated. When the duration of the small glitch interference voltage is less than the specified delay time tduv, the control circuit is not affected, and the under-voltage lockout protection circuit does not operate. The tduv value is about 10 μs. To resume normal operation, the supply voltage must exceed the undervoltage reset threshold (UVr). During the power-on and power-off of the control power supply, the under-voltage lockout protection circuit may work. This is a normal phenomenon. All the system controller program needs to consider is the pulse width of the generated fault output signal.
4) Overheat protection:
A temperature sensor is installed on the insulating substrate close to the IGBT chip. When the temperature of the substrate exceeds the overheating cut-off threshold (OT), the protection circuit in the IPM will stop the gate drive and will not respond to the control input signal until the source of overheating is eliminated. When the temperature drops below the overheat reset threshold (OTr) and the control input is at a high level (off state), the power chip will resume work, and resume normal operation when the next low level input signal (on state) comes.
Widely used in DC motor speed regulation, AC voltage regulation, industrial heating and temperature regulation, industrial electrical automation, various electrical control and power supplies for various purposes (electroplating, temperature regulation, excitation, dimming, etc.).
The Links: 6MBP30RTB060-50 FZ3600R17KE3_S1