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Inverters and Drives from TDK - Hero Banner

Inverters & Drives from TDK

Mixed Media - Conversion

Conversion

At the conversion stage of a variable frequency drive, the DC voltage is converted into an AC voltage at a given but variable voltage and frequency to drive the motor. The conversion circuit typically consists of IGBTs as a full bridge made of discrete semiconductors or supplied in a semiconductor module. Here, snubber capacitors are needed to reduce the overshoots when conducting semiconductors are switched off. Gate-drive transformers are used to switch the IGBT on and off and current-sense transformers are used to measure the current.

Snubber Capacitors - Table

Snubber capacitors

Product Type	Series	Technical Data	Datasheet	Features Overview
Snubber Capacitors	B3265x Series with 2 pin	Medium Power MKP Film Capacitor Rated Capacitance: 1 nF … 8.2 uF Rated Voltage: 250 … 2000 V DC Rated Voltage: 160 … 1000 V AC	Download	High pulse strength and high contact reliability Very low inductance Mechanical stability Wound capacitor technology with internal series connection
Snubber Capacitors	B32656/8S	MKP Snubber Capacitor Rated Capacitance: 68 nF … 5.6 uF Rated Voltage: 850 … 2000 V DC Rated Voltage: 450 … 800 V AC	Download	High pulse strength and high contact reliability Very Low ESL & ESR Thermal & Mechanical stability Wound capacitor technology with internal series connection
Snubber Capacitors	B32686S	MFP Snubber capacitor Rated Capacitance: 22 nF … 680 nF Rated Voltage: 1000 … 2000 V DC Rated Voltage: 400 … 500 V AC	Download	Maximum pulse handling capability together with the maximum ripple current and frequency Very Low ESL & ESR Thermal & Mechanical stability Wound capacitor technology with internal series connection
Snubber Capacitors	CeraLink - LP Series	Capacitance: 0.25µF … 1µF Rated voltage: 500 … 900 V DC (IGBT Rated: 650 … 1300 VDC) Low Profile series	Download	High Capacitance density Low ESL and ESR Low losses at high frequencies and high temperatures High current rating High operating and peak temperatures Ideal for fast-switching semicons (SiC, GaN) LP series qualified based on AEC-Q200 Supports miniaturisation on system level

NTC Thermistors - Table

NTC thermistors

Product Type	Series	Technical Data	Datasheet	Features Overview
NTC	B57860S	Operating Temperature -40°C to +150°C Resistance Accuracy ±3% at nominal temperature Rated resistance at +25 °C: 5 … 85 kΩ UL approval on request	Datasheet	NTC chip connection using standard semiconductor manufacturing processes NTC chip with termination on top and bottom side (silver or gold metallization) Resistance accuracy of ±3% at nominal temperature (eg. 100°C) Category temperature up to 150 °C

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Inverters and drives brochure

Avnet Abacus offers a comprehensive portfolio of EPCOS and TDK branded products for state-of-the-art inverter and drive design

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Right Rail Card Dark - Protection

Protection

Thermistors acting as inrush current limiters are a low cost solution to this problem whilst input varistors are used to provide surge protection against voltage spikes on the input.

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Right Rail Card Dark - Input Filtering

Input filtering

EMC input filter requirements include limitation of conducted and radiated emissions, immunity to transients and surges on the power lines, and immunity to levels of external electromagnetic radiation and electrostatic discharge.

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Right Rail Card Dark - Rectification

Rectification

Each AC input phase is rectified by 3 diodes (top diode in the positive direction and the low side diode of the other two phases) so that the peak of the negative half cycle appears positive.

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Right Rail Card Dark - DC-Link

DC-Link

A DC-link capacitor is fitted at this point to provide a low impedance path for high frequency switching currents and to provide energy storage.

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Right Rail Card Dark - Thermal Management

Thermal management

In a drive, the heatsink’s role is to cool the semiconductors and DC link capacitors and prevent overheating.

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Right Rail Card Dark - Driver and Controller

Driver and controller

The Control and Feedback stages analyse signals from the current sensors mounted at the motor output, measure the temperature of sensors and control the driver for the conversion semiconductors.

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Right Rail Card Dark - Output Filtering

Output filtering

The output stage of a drive takes a three-phase AC output with variable frequency and amplitude for fine speed and torque control and filters it to minimise EMI and provide reliable operation of the power converter and load.

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