Intelligent power components, vehicle IPD performance improvement demand rise

If you want to achieve lower on-resistance and higher heat dissipation capacity, you want to trade off at the center, especially with the current trend of IPDs miniaturization, it is increasingly difficult to achieve low on-resistance and high heat dissipation capacity. Good on-off resistance characteristics enable IPDs to play a more effective role in applications where startup failures may occur through low loss technologies and new manufacturing processes, further reducing loss values, ensuring heat dissipation, and greatly improving device reliability and scalability.

In previous ECUs, most relays were used as switching elements in the drive circuit, and then the mechanical relays began to switch to semiconductor switches. And this trend soon swept through all the applications of the vehicle, especially in motor and heater control applications.

Intelligent Power Device, IPD, Intelligent Power Device, which is a monolithic power IC, the power of the output phase is integrated on a single AVS1ACP08 chip. MOSFET or IGBT and a circuit that controls the output phase. IPD has the characteristics of compact, light weight, high power, not restricted by contact wear, so as to form a highly reliable system with self-protection function, which has a broad application space in automotive electronics.

High voltage and low voltage IPDs

The so-called intelligent power element can replace the manual to complete complex power control, so it is endowed with intelligent characteristics. Common protection functions include undervoltage protection, overvoltage protection, overcurrent protection, short-circuit protection, and overheating protection. In addition, some intelligent power equipment has output voltage overshot protection, transient current limit, soft start and maximum input power limit protection circuit, which can greatly improve the stability and reliability of the system. According to the data given by ROM, the current IPD industrial market size has reached about 218 million dollars, the automobile market demand is also growing, the annual growth rate of more than 730 million dollars.

Ipds can also be divided into high pressure and low pressure, automotive, industrial low pressure. Ipds are divided into high side and low side, high side and high side. The IPD switch is located between the power supply and the load, with a low edge. The IPD is located between the load and GND. Low voltage IPD works normally, over current work, heat off state, open state will have different operating truth value. When an anomaly is detected, the IPD diagnostic function drives the DIAG terminal to a high or low level. In the case of overcurrent protection, heat shutdown or open-circuit load detection trip, an abnormal signal will be sent. MCU or logic circuit processing and diagnosis of input and output signals can identify the abnormal situation in the middle of the IPD.

The high voltage IPD is dedicated to driving the BLDC motor, and the high voltage IPD Hall effect sensor and a controller receive the control signal through the Hall effect device IC. Grid drive high voltage side device IC This voltage requires a high voltage equivalent to the sum of the high voltage supply and grid source voltage. Since the low voltage side control signal cannot directly drive the high side pole drive IC, the high voltage IPD requires a level conversion driver IC control signal to be transmitted from the low voltage circuit to the high voltage circuit. IDP and high-voltage compatible small patch packaging can further reduce the installation area, such as Toshiba's smart power high-voltage IPD series used SSOP30 and HSSOP31 packaging, this series of high-voltage packaging IPD also uses a new high breakdown voltage. The SOI process further reduces losses.

IPD low resistance and high heat dissipation

As with other power devices, IPD on-resistance and heat dissipation are mutually dependent. If you want to achieve lower on-resistance and higher heat dissipation capacity, you want to trade off at the center, especially with the current trend of IPDs miniaturization, it is increasingly difficult to achieve low on-resistance and high heat dissipation capacity.

More recently, ROM has developed the 40V8 for on-board electronic systems, such as engine control units and transmission control units, PLCS, etc., for industrial equipment, with a single and dual channel output IPD that can withstand pressure through the exclusive TDACC process which achieves a good balance of on-resistance and heat dissipation.

Romm's process can integrate grooved MOS and CMOS in the same chip, which helps to reduce on-off resistance, and TDACC technology enables the IPD product to have a thermally dispersed active clamping circuit. In short, in normal operation, TDACC, when active clamp function is in effect, enables the flow of current channels to achieve low on-resistance, TDACC is controlled by circuits, the number of working grids is reduced, thus achieving high heat dissipation. In terms of packaging, Rohm developed solid materials according to the heat dissipation requirements of power devices to ensure packaging. IPD has good heat dissipation performance.

Summary

Good on-off resistance characteristics enable IPDs to play a more effective role in applications where startup failures may occur through low loss technologies and new manufacturing processes, further reducing loss values, ensuring heat dissipation, and greatly improving device reliability and scalability. IPD is applied in automotive electronics to improve the protection performance of vehicle equipment.