High-speed air duct IPM solution recommendation

As a household appliance, the design of high-speed hair dryers must comply with safety regulations, so a variety of safety designs have emerged. Some use MOS + pre-driver + safety capacitors, while some directly use IPM + safety capacitors to make them more reliable. The methods are different and the costs are slightly different, but the purpose is the same, to meet safety requirements.

1. The role of IPM devices

IPM and Intelligent Powr Module, intelligent power module. It not only integrates power switch devices and drive circuits, but also has built-in fault detection circuits such as overvoltage, overcurrent and overheating, and can send detection signals to CPU or DSP for interrupt processing. It is composed of high-speed and low-power consumption tube cores, optimized gate-level drive circuits and fast protection circuits. Even if a load accident or improper use occurs, the IPM itself will not be damaged. IPM generally uses IGBT as a power switch element, and has an integrated structure with built-in current sensors and drive circuits.

The IPM module is a device that integrates peripheral circuits into a power module. IPM has won an increasingly large market with its high reliability and easy use. It is especially suitable for frequency converters and various inverter power supplies for driving motors. It is widely used in AC motor variable frequency speed regulation and DC motor chopper speed regulation, metallurgical machinery, electric traction, servo drive, variable frequency home appliances and various high-performance power supplies (such as UPS, induction heating, welding machines, active compensation, DC-DC, etc.), industrial electrical automation and other fields. It has a broad market and is a very ideal power electronic device.

2. Characteristics of IPM

1) Fast switching speed. The IGBT chips in the IPM are all high-speed, and the drive circuit is close to the IGBT chip, with a small drive delay, so the IPM has a fast switching speed and low loss.

2) Low power consumption. The IGBT inside the IPM has a low on-state voltage and a fast switching speed, so the IPM consumes little power.

3) Fast overcurrent protection. The IPM detects the IGBT current in real time. When a severe overload or direct short circuit occurs, the IGBT will be soft-turned off and a fault signal will be sent out.

4) Overheat protection: A temperature sensor is installed on the insulating substrate close to the IGBT. When the substrate is overheated, the internal control circuit of the IPM will cut off the gate drive and will not respond to the input control signal.

5) Bridge arm to tube interlocking. On the bridge arms connected in series, the drive signals of the upper and lower bridge arms are interlocked, effectively preventing the upper and lower arms from being turned on at the same time.

6) Strong anti-interference ability. Optimized gate-level driver and IGBT integration, reasonable layout, no external drive line.

7) Drive power undervoltage protection. When it is lower than the drive control power supply (usually 15V), the drive capability will be insufficient and conduction damage will increase. IPM automatically detects the drive power supply, and when it is lower than a certain value for more than 10?s, the drive signal will be cut off.

8) IPM has built-in related peripheral circuits, which shortens development time and speeds up product launch.

9) No anti-static measures are required.

10) The number of components is greatly reduced and the volume is correspondingly small.

3. Compared with the MOS tube solution, the high-speed air duct designed with IPM module has more uniform surface heat dissipation with discrete IGBT and FRD, which is not easy to cause heat accumulation. The industry standard package shape and process compatible with various PCB substrates provide an economical and efficient solution. The solution integrates IPM, rectifier bridge, bus voltage sampling circuit, phase voltage sampling circuit, current sampling, pre-charge circuit, relay output, power supply circuit, etc.

IPM integrates logic, control, detection and protection circuits, which is easy to use. It not only reduces the size of the system and development time, but also greatly enhances the reliability of the system, and adapts to the development direction of today's power devices - modularization, compounding and power integrated circuits.