3300V Amantys Power Drive™ Technical Manual SP000005 Important The information contained herein is intended exclusively for qualified engineers who are experienced with, and trained in, working with high voltage apparatus which involves risk to life. Strict compliance with all relevant safety regulations for the target application is essential. Any handling of electronic devices is subject to the general specifications for protecting electrostatic sensitive devices according to international standard IEC 747-1, Chapter IX or European standard EN 100015 (i.e. the workplace, tool, operating environment, etc. must comply with these standards). Failure to comply may lead to the product becoming damaged. Technical Support For technical support please visit www.amantys.com. For IGBT module data refer to the manufacturer’s data sheet. For Amantys Power Drive / IGBT module specific data, please visit www.amantys.com/docs. Quality Control The gate drive is manufactured according to ISO9001:2000 quality standards. Product Customisation Contact Amantys Ltd to discuss any product customisation requirements. Legal Disclaimer This document describes devices but cannot promise to deliver any specific characteristics. No warranty or guarantee is given - either expressly or implicitly - regarding delivery, performance or suitability. Amantys Limited reserves the right to make modifications to its technical data and product specifications at any time and without prior notice. The general terms and conditions of delivery of Amantys Limited apply. Amantys Power Drive™, Amantys Power Insight™, and Amantys® are trademarks of Amantys Limited. Revision Table Version 01 02 Comments First issue Eng. update Page 2 of 12 AMA_AN33AA1_UM_02_14 Approver Mark Snook Robin Lyle PRELIMINARY Release Date May 2012 January 2014 © Amantys Ltd SP000005 v02g 3300V Amantys Power Drive Technical Manual www.amantys.com Contents Overview Installation Technical Description Input / Output Interface Control Logic IGBT Protection Features Gate Drive Circuit Voltage Isolation Gate Drive Protection Features 3 4 7 8 9 9 11 12 12 The 3300V Amantys Power Drive is a compact, high performance, single channel gate drive for high-power IGBT modules. It drives all leading manufacturer’s modules and fits within the footprint of the 140x190mm package popular in high power converters. This document describes how to install and connect the gate drive module. The document also provides a high-level technical description. Overview The Amantys Power Drive is a single circuit board that is designed to control 3300V IGBT modules with current ratings of 1200A and 1500A. The gate drive features a fibre-optic interface, an integrated DC/DC power supply, gate drive circuits and protection circuits. The Amantys Power Drive is constructed from commercially available, off-the-shelf components. The gate drive fits within the footprint of the IGBT module, eliminating the need for external mechanical protection. The 3300V Amantys Power Drive is one of a family of IGBT gate drives with various voltage and current ratings. Members of the family can be customised for specific customer requirements, © Amantys Ltd SP000005 v02g PRELIMINARY Page 3 of 12 AMA_AN33AA1_UM_02_14 3300V Amantys Power Drive Technical Manual www.amantys.com Installation Installation of the Amantys Power Drive module is a two-stage process: Mount the gate drive on the chosen IGBT module Make the control and DC power connections WARNING: High voltage equipment - For use by trained personnel only. Failure to observe electrical shock precautions while the equipment is in operation may result in personal injury, electrical shock damage to, or destruction of components of this equipment. WARNING: The gate drive includes a current source which delivers approximately 3mA into the collector of the IGBT module for desaturation protection purposes. This current is generated from an 80V voltage source. Care should be taken when the gate drive is powered, but not switching, as any DC link capacitors may be slowly charged. Care should also be taken when handling a powered gate drive as 80V is present on the board. CAUTION: When handling the gate drive and the IGBT module, observe all electro-static precautions. If these precautions are not taken, permanent damage to the components may result. NOTE: Refer to the 3300V Amantys Power Drive Data Sheet (SP000003) for specifications and characteristics. Page 4 of 12 AMA_AN33AA1_UM_02_14 PRELIMINARY © Amantys Ltd SP000005 v02g 3300V Amantys Power Drive Technical Manual www.amantys.com Use the following procedure to install the gate drive onto the IGBT module: Attach the gate drive board to the IGBT module using three screws. Part Description: Socket Head, Cap Screw, M4 x 8, Stainless Steel; M4 spring washers Check the IGBT technical information; a torque value for the fixing screws may be recommended. If no value is recommended, use 2.0 N-m maximum. © Amantys Ltd SP000005 v02g PRELIMINARY Page 5 of 12 AMA_AN33AA1_UM_02_14 3300V Amantys Power Drive Technical Manual www.amantys.com Connect the 15V DC power supply. Part Description (fitted): Connector: ERNI 214012, 4 pin, male, 1.27 mm pitch (Not shown on image above) Description Voltage Pins Zero volts Supply Voltage 0V VDC 1 and 4 2 and 3 Connect the fibre-optic control cables. Part Description (fitted): Fibre-optic receiver, Avago, HFBR-2522ETZ Fibre-optic transmitter, Avago, HFBR-1522ETZ The gate drive is now ready to be put into service. Page 6 of 12 AMA_AN33AA1_UM_02_14 PRELIMINARY © Amantys Ltd SP000005 v02g 3300V Amantys Power Drive Technical Manual www.amantys.com Technical Description NOTE: Refer to the 3300V Amantys Power Drive Data Sheet (SP000003) for specifications and characteristics. The gate drive is used to control high-power and high-voltage IGBT modules. The gate drive is fully equipped with safety and protection features, including short circuit protection (desaturation detection), over-voltage and supply under-voltage protection. A block diagram of the gate drive is shown below. The major functional blocks are described in the remainder of this section. Gate Drive Block Diagram © Amantys Ltd SP000005 v02g PRELIMINARY Page 7 of 12 AMA_AN33AA1_UM_02_14 3300V Amantys Power Drive Technical Manual www.amantys.com Input / Output Interface In normal operation, under non-fault conditions, the state of the gate is controlled by the input (or receive) optical fibre connection. If light is received at the fibre-optic input, the IGBT will be ON. Conversely, if the light is off, the IGBT will be OFF. A change in state must last for at least 400ns before it will be acted on and acknowledged. Changes in state lasting less than 400ns are ignored. When a change in the receive state is detected an acknowledge signal is sent via the output (or transmit) optical fibre connection. The transmit light will normally be on; the acknowledge signal is an off pulse (typically 600ns wide) delivered typically 600ns after the change in receive state is detected. Control Timing Diagram The output connection is also used to signal a fault with the IGBT or the gate drive. When a fault occurs, the output light is turned off for the duration of the fault. Indicated faults include: Short circuit in the IGBT or associated power circuits Gate drive supply undervoltage No connection between gate drive and IGBT Page 8 of 12 AMA_AN33AA1_UM_02_14 PRELIMINARY © Amantys Ltd SP000005 v02g 3300V Amantys Power Drive Technical Manual www.amantys.com Control Logic The control logic coordinates the operation of the gate drive including the interfaces, IGBT drive circuit, protection features, and event timings. Configuration The gate drive is factory configured for the specific IGBT type with which it is to be used. The configuration of the gate resistances that are used to optimise the switching performance of the IGBT is implemented through the control logic configuration. The clamping voltage of the VCE clamp is configured in hardware; see VCE Clamp, page 10. IGBT Protection Features Gate Drive Supply Undervoltage Protection Under-voltage protection of the gate drive is provided to prevent operation of the IGBT at low input voltage and protect the IGBT module from damage due to high on-state losses resulting from low gate voltage. If the driver supply voltage, normally +15V, ±0.5V, drops below 12.9V, the IGBT will be turned off, the gate driver disabled and a fault is indicated via the fibre-optic output to the central controller. The IGBT will remain off until the supply voltage exceeds 13.5V. Gate Drive Voltage Monitor The voltages generated by the DC/DC converter are constantly monitored. If any of the voltages fall below their preset thresholds, an error will be raised and the IGBT will be switched off. IGBT Short Circuit Protection Short circuit protection of the IGBT is achieved by monitoring the IGBT for desaturation. The collector-emitter voltage (VCE) is monitored at switch-on and during the on time. If a shortcircuit (desaturation) is detected, an error is signalled on the output (transmit) fibre-optic. The conditions for the detection of the IGBT module desaturation are as follows. At switch on, VCE is checked after 8.5µs. If the Vce voltage has not fallen below 59V an error (type 1 short circuit) is flagged by the control logic. If VCE rises above 59V during the on period, a desaturation event will be detected (type 2 short circuit). NOTE. Short circuit types Type 1: The IGBT turns on into an existing short circuit. Type 2: The short circuit occurs while the IGBT is turned on Two-Level Mode: The response to a desaturation event depends on the configuration in the control logic. In a 2-level configuration (for use in 2-level converters), the IGBT will be turned off automatically by the gate driver and a fault signal indicated on the output optical fibre. The IGBT gate will be held low (at -15V) and switching will be inhibited for one second following a desaturation event to allow the IGBT chip temperatures to stabilise and protect the IGBT. The on time of the IGBT in a short circuit will be limited to less than 10µs. See the following figure for typical short circuit event waveforms. © Amantys Ltd SP000005 v02g PRELIMINARY Page 9 of 12 AMA_AN33AA1_UM_02_14 3300V Amantys Power Drive Technical Manual www.amantys.com Two-Level Mode Type 1 Short Circuit Waveforms and Timing Diagram Three-Level and Multilevel Modes: In three-level mode, for use in three level and multilevel converters, turning each IGBT on and off is the responsibility of a central controller; communication with the controller is via the receive and transmit fibre-optic links. If a desaturation is detected, the control logic will signal an error on the output fibre-optic (transmit) by turning the transmitter off. The state of the IGBT will not be changed by the driver until commanded to do so, on the input fibre-optic (receive) by the central controller. VCE Clamp VCE overshoots are controlled by the VCE clamp, which protects the IGBT from seeing an overvoltage at its terminals. The voltage clamp will begin to operate if VCE exceeds 2.3kV and will limit VCE to a maximum of 2.8kV. At turn-off, when the IGBT is switching, the dICE/dt (the rate of change of current over time) through the stray inductances in the circuit may cause a transient voltage overshoot across the IGBT collector - emitter terminals. The overshoot can cause damage to the IGBT if it exceeds the IGBT maximum collector to emitter voltage rating, VCE(max). Page 10 of 12 AMA_AN33AA1_UM_02_14 PRELIMINARY © Amantys Ltd SP000005 v02g 3300V Amantys Power Drive Technical Manual www.amantys.com The VCE clamp works by softening the IGBT turn-off by keeping VCE, and hence the IGBT, in its active region momentarily, in order to control the di/dt slope and limit the overshoot voltage. When the overshoot voltage decays the IGBT continues to turn off normally. The VCE clamp is a protection feature to prevent damage to the IGBT in the case of turn-off from very high collector-emitter current (ICE) or turn-off with a very high DC link voltage. CAUTION: If the gate drive VCE clamp operates on every cycle, damage to the clamp circuit may occur due to the repetitive activity. VGE Clamp A Transient Voltage Suppressor (TVS) between the gate and emitter protects the gate and prevents VGE rising above 20V. Gate-Emitter Clamp The Gate-Emitter clamp connects the gate and emitter through a low impedance path when the gate drive is unpowered or if a fault occurs in the gate drive circuit. This holds the IGBT off when the gate drive is unpowered and provides resilience to transients that could cause a spurious turn-on of the IGBT. Gate Drive Circuit The IGBT is driven through a combination of resistors determined by the factory set configuration of the control logic which is tailored to drive the matching IGBT in an optimal manner. The gate drive circuit drives the gate between -15V and a regulated +15V. © Amantys Ltd SP000005 v02g PRELIMINARY Page 11 of 12 AMA_AN33AA1_UM_02_14 3300V Amantys Power Drive Technical Manual www.amantys.com Voltage Isolation Power for the gate drive is supplied by an on-board DC/DC converter. The input voltage is +15VDC, ±0.5V. The converter provides galvanic isolation between 15V supply and the onboard voltages, thus preventing any possibility of damage to the circuits on the supply side of the gate drive. The gate control signals are similarly isolated by the use of fibre-optic links. The layout of the gate drive and the positioning of the components and gate terminals ensure that the creepage and clearance requirements are met; see 3300V Amantys Power Drive Data Sheet, SP000003, and as specified in the Railway Application Standards IEC 60077 and IEC 61287. The same standards also define this equipment as conforming to Pollution Degree 2 and Overvoltage Category 2. NOTE. Creepage is the shortest path between two conductive parts measured along the surface of the insulation. Clearance is the shortest distance between two conductive parts measured through air. Gate Drive Protection Features Power Supply Overcurrent Protection: If a short circuit in the secondary side of the power supply occurs, the DC/DC converter will shut down. The DC/DC converter will also shut down if the polarity of the supply is reversed. A resettable fuse is provided as a safety feature to protect against a primary side fault. When the fault condition ceases, the fuse will reset and conduct normally. Soft Start: A soft start capability protects the gate drive against excessive input current surge at start-up. For further information… Email: [email protected] Web: www.amantys.com Tel: +44 (0)1223 652 450 Page 12 of 12 AMA_AN33AA1_UM_02_14 Amantys Limited Platinum Building St John’s Innovation Park Cowley Road Cambridge, UK CB4 0WS PRELIMINARY © Amantys Ltd SP000005 v02g
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