Power_electronics Features

New Developments in RET Technology - Feb/March 2021
Resistor-Equipped Transistors (RETs) also known as digital transistors or pre-bias transistors offer many benefits, including saving space, reducing manufacturing costs and increased...
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Power Electronics Europe News
Resolver sensor interface is integrated for accuracy

Claimed to be the industry’s first resolver sensor interface with integrated power supply, exciter amplifier and functional safety features, the PGA411-Q1 is capable of simultaneously exciting the resolver sensor coil and calculating the angle and velocity of a rotating motor shaft without the external components required by competitive solutions. The converter’s architecture can help designers increase system accuracy and stability for end equipment like hybrid electric vehicle/electric vehicle (HEV/EV) traction inverters, electric power steering, integrated start-stop generators, industrial alternating current (AC) servo motor control and robotic arm control.

The bill of materials and PCB space is reduced by up to 50%, with the elimination of at least 10 external and passive components. Its integrated exciter amplifier, high-voltage boost power supply with short protection, and programmable fault detection thresholds and filters allows the converter to support a range of 4.0 to 7.0Vrms resolver sensors and often to eliminate the need for external circuitry, says the company.

The integrated built-in self-test performs an analogue and logic component self-check automatically upon start-up, enabling enhanced latent fault coverage. The self-test and diagnostics are claimed to largely eliminate the need for external protection and enable engineers to develop systems that meet Automotive Safety Integrity Level (ASIL) D functional safety certification for ISO 26262.

The architecture provides over-voltage, under-voltage and thermal protections, including separation of the high-current and high-voltage blocks from other parts of the device, which are susceptible to damage. The analogue front end’s integrated comparators remove the need for an external ADC, which reduces the effects of quantization noise on the input signals from the sensor.

The converter can be paired with the company’s C2000 F28379 microcontrollers and DesignDRIVE Position Manager technology for functional safety redundancy. The converter is available in a 64pin thermally enhanced TQFP PowerPad package. An evaluation module is also available.



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