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01/01/2005
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International Rectifier’s die-on-leadframe (DOL) power packaging technology has been designed to meet the technical challenges of electro-hydraulic power steering (EHPS) and electric power steering (EPS).
For example, EPS is an enabling technology for four-wheel steering systems and improved stability control. However, limitations in electrical efficiency, the availability of current on the vehicle bus and torque ripple which affects steering feel have all delayed its implementation into higher curb weight vehicles.
The DOL concept, for which patents are pending, is said to deliver exceptionally low package inductance and resistance by minimising the number of material layers to improve performance while reducing the number of interconnections. Lower thermal resistance allows for higher current capabilities with smaller die sizes and lower torque ripple.
For medium to high power applications, IR researchers say DOL offers better electrical conductivity and increased thermal performance than alternative methods using insulted metal substrate (IMS), direct-bonded copper (DBC) to a ceramic substrate, thick film substrates or PCB-based modules which primarily use discrete power devices.
A DOL power module includes silicon devices directly soldered to a copper leadframe within an injection-moulded shell. The internal components are connected directly to outside terminals.
The first IR devices to use DOL technology are IR11867-E02 rated at 120A and IR11867-E01 (rated at 160A). They are targeted directly at EPS and EHPS applications.
Alternator regulator is first to use LIN
IR has also developed an alternator-regulator for future generations of vehicles that is controlled via the low speed, low-cost LIN (local interconnect network) communication bus.
The LIN interface provides a simplified method of reliably achieving the bi-directional communication required for maximum alternator performance in an intelligent charging system. The LIN serial interface is used by the engine control unit to transmit charging voltage setpoint from 10.7V to 16V, load response control ramp and cut-off speed and the field excitation limit. The voltage set-point command can also disable the field driver for a momentary no-output condition.
Signals transmitted to the ECU from the regulator include field excitation duty cycle, current or temperature (customer-defined) and the fault status.
Transmitted fault codes provide unique indication for mechanical, electrical, temperature, communication and timeout errors. In addition, the LIN-controlled alternator-regulator includes short-circuit protection, EMI and ESD suppression and consumes less than 200µA standby current.
The IR LIN-controlled alternator regulator is assembled using thick-film hybrid technology for reliable high temperature operation and excellent parametric stability over the entire operating temperature range of –40ºC to +150ºC.
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Author
Roger bishop
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Copyright European Automotive Design.
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