Wolfspeed Kit-crd-cil17n-bm User manual

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

USER GUIDE PRD-07123

KIT-CRD-CIL17N-BM

WOLFSPEED BM HALF-BRIDGE MODULE®

DYNAMIC EVALUATION BOARD USER GUIDE

半桥模块动态评估板用户指南

ハーフブリッジモジュール動的評価ボードユーザーガイド

User Guide

Wolfspeed Power Applications

Wolfspeed, Inc.

4600 Silicon Drive

Durham, NC 27703, USA

沃孚半导体有限责任公司

4600 Silicon Drive

Durham, NC 27703, USA

クリー株式会社

4600 Silicon Drive

Durham, NC 27703, USA

This document is prepared as a user guide to install and operate Wolfspeed® evaluation hardware.

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

All parts of this user guide are provided in English, and the Cautions are provided in English, Mandarin, and

Japanese. If the end user of this board is not fluent in any of these languages, it is your responsibility to ensure

that they understand the terms and conditions described in this document, including without limitation the

hazards of and safe operating conditions for this board.

本文件中的所有内容均以英文书写，“注意”部分的内容以英文、中文和日语书写。作为本板子的终端用

户，即使您不熟悉上述任何一种语言，您也应当确保正确理解本文件中的条款与条件，包括且不限于本板

子的危险隐患以及安全操作条款。

当書類のすべての内容は英語で書きます。「注意点」の内容は英語、中国語、また日本語で書きます。

当ボードの端末使用者は上記の言語が一つでもわからないなら、当端末使用者は当書類の条約と条件が

理解できるのを確保すべきです。そして、当ボードの危険や安全に使用する条件を含み、また限りませ

ん。

Note: This Wolfspeed-designed evaluation hardware for Wolfspeed®components is a fragile, high-voltage, high-

temperature power electronics system that is meant to be used as an evaluation tool in a lab setting and to be

handled and operated by highly qualified technicians or engineers. When this hardware is not in use, it should

be stored in an area that has a storage temperature ranging from -40° Celsius to 105° Celsius. If this hardware is

transported, to avoid any damage to electronic components, special care should be taken during transportation

to avoid damaging the board or its fragile components and the board should be transported carefully in an

electrostatic discharge (ESD) bag, or with ESD or shorting protection that is the same as, or similar to, the

protection that is or would be used by Wolfspeed when shipping this hardware. Please contact Wolfspeed at

https://forum.wolfspeed.com/ if you have any questions about the protection of this hardware during

transportation. The hardware does not contain any hazardous substances, is not designed to meet any

industrial, technical, or safety standards or classifications, and is not a production-qualified assembly.

本样机（易碎、高压、高温电力电子系统）由Wolfspeed为评估其功率半导体产品而设计，用以作为在实

验室环境下由专业的技术人员或工程师处理和使用的评估工具。本样机不使用时，应存储在-40oC~105oC

温度范围的区域内；如需运输样机，运输过程中应该特别小心，避免损坏电路板等易碎组件。如果您对此

硬件在运输之中的保护有任何疑问，请联系https://forum.wolfspeed.com/。样机应放置在防静电包装袋内

谨慎运输，避免损坏电子组件。本样机不含任何有害物质，但其设计不符合任何工业、技术或安全标准或

分类，也不是可用于生产的组件。

このクリーのコンポーネント用評価ハードウェアは壊れやすい高電圧の高温パワーエレクトロニクスシステムで

あり、ラボ環境での評価ツールとして使用され、優秀な技術者やエンジニアによって処理され、操作されることを

意図している。ハードウェアが使用されていない場合、保管温度が-40℃から105℃の範囲に保管してください。

このハードウェアを輸送する場合は、輸送中にボードまたはその壊れやすいコンポーネントに損傷を与えないよ

う特別な注意を払う必要がある。また電子部品の損傷を避けるためにボードを静電気放電（ESD）袋に静置して

慎重に輸送するべき。ハードウエアの輸送中の保護について質問があれば、https://forum.wolfspeed.com/に

連絡してください。ハードウェアには危険物質が含まれていないが、工業的、技術的、安全性の基準または分類

に適合するように設計されておらず、生産適格組立品でもない。

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

CAUTION

PLEASE CAREFULLY REVIEW THE FOLLOWING PAGES, AS THEY CONTAIN IMPORTANT

INFORMATION REGARDING THE HAZARDS AND SAFE OPERATING REQUIREMENTS

RELATED TO THE HANDLING AND USE OF THIS BOARD.

警告

请认真阅读以下内容，因为其中包含了处理和使用本板子有关的危险隐患和安全操作要求

方面的重要信息。

警告

ボードの使用、危険の対応、そして安全に操作する要求などの大切な情報を含むので、

以下の内容をよく読んでください。

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

CAUTION

DO NOT TOUCH THE BOARD WHEN IT IS ENERGIZED AND ALLOW THE BULK CAPACITORS TO

COMPLETELY DISCHARGE PRIOR TO HANDLING THE BOARD. THERE CAN BE VERY HIGH

VOLTAGES PRESENT ON THIS EVALUATION BOARD WHEN CONNECTED TO AN ELECTRICAL

SOURCE, AND SOME COMPONENTS ON THIS BOARD CAN REACH TEMPERATURES ABOVE

50˚ CELSIUS. FURTHER, THESE CONDITIONS WILL CONTINUE FOR A SHORT TIME AFTER

THE ELECTRICAL SOURCE IS DISCONNECTED UNTIL THE BULK CAPACITORS ARE FULLY

DISCHARGED.

Please ensure that appropriate safety procedures are followed when operating this board,

as any of the following can occur if you handle or use this board without following proper

safety precautions:

●Death

●Serious injury

●Electrocution

●Electrical shock

●Electrical burns

●Severe heat burns

You must read this document in its entirety before operating this board. It is not necessary for

you to touch the board while it is energized. All test and measurement probes or attachments

must be attached before the board is energized. You must never leave this board unattended

or handle it when energized, and you must always ensure that all bulk capacitors have

completely discharged prior to handling the board. Do not change the devices to be tested until

the board is disconnected from the electrical source and the bulk capacitors have fully

discharged.

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

警告

请勿在通电情况下接触板子，在操作板子前应使大容量电容器的电荷完全释放。接通电源后，

该评估板上通常会存在危险的高电压，板子上一些组件的温度可能超过 50 摄氏度。此外，移

除电源后，上述情况可能会短时持续，直至大容量电容器电量完全释放。

操作板子时应确保遵守正确的安全规程，否则可能会出现下列危险：

●死亡

●严重伤害

●触电

●电击

●电灼伤

●严重的热烧伤

请在操作本板子前完整阅读本文件。通电时禁止接触板子。所有测试与测量探针或附件必须在

板子通电前连接。通电时，禁止使板子处于无人看护状态，且禁止操作板子。必须确保在操作

板子前，大容量电容器已释放了所有电量。只有在切断板子电源，且大容量电容器完全放电后，

才可更换待测试器件。

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

警告

通電している時、ボードに接触するのは禁止です。ボードを処分する前に、大容量のコンデ

ンサーで電力を完全に釈放すべきです。通電してから、ボードにひどく高い電圧が存在して

いる可能性があります。ボードのモジュールの温度は 50 度以上になるかもしれません。また、

電源を切った後、上記の状況がしばらく持続する可能性がありますので、大容量のコンデン

サーで電力を完全に釈放するまで待ってください。

ボードを操作するとき、正確な安全ルールを守るのを確保すべきです。さもないと、以下の

危険がある可能性があります:

●死亡

●重症

●感電

●電撃

●電気の火傷

●厳しい火傷

当ボードを操作する前に、完全に当書類をよく読んでください。通電している時にボードに

接触する必要がありません。通電する前に必ずすべての試験用のプローブあるいはアクセサ

リーをつないでください。通電している時に無人監視やボードを操作するのは禁止です。ボ

ードを操作する前に、大容量のコンデンサーで電力を完全に釈放するのを必ず確保してくだ

さい。ボードの電源を切った後、また大容量のコンデンサーで電力を完全に釈放した後、試

験設備を取り換えることができます。

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

CONTENTS

Contents ..................................................................................................................................... 7

Introduction ............................................................................................................................... 8

Evaluation Boards Contents .................................................................................................... 10

Current and Voltage Sensing ................................................................................................... 13

CVR Cabling and Termination .............................................................................................. 14

Inductor .................................................................................................................................... 14

Power Supply ........................................................................................................................... 15

Gate Driver................................................................................................................................ 19

Voltage Sensing .................................................................................................................... 19

Revision History........................................................................................................................ 19

IMPORTANT NOTES.................................................................................................................. 20

Purposes and Use..................................................................................................................... 20

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

INTRODUCTION

This document describes in detail a clamped inductive load (CIL) test fixture designed to accurately measure the

voltage and current waveforms of a Wolfspeed BM power module, shown below in Figure 1, under an inductive

load switching event. This enables the calculation of switching loss energies under precise test conditions to

dynamically evaluate the module and facilitate in-module comparisons and power electronic system design.

During a CIL switching event, the voltage across and the current through a switch position are simultaneously

present. Multiplying these two waveforms point-by-point results in a time-domain function of the instantaneous

power in units of Watts (W). The instantaneous power has large peaks two times per switching period at the turn-

on and turn-off events. The instantaneous power can then be integrated using built-in oscilloscope MATH tools

or waveform data and post processing to determine the total energy lost in Joules (J) during a given switching

event.

FIGURE 1: WOLFSPEED SILICON CARBIDE (SIC) BM3 HALF-BRIDGE MODULE.

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

There are two types of switching events: actively switched (MOSFET) and forced commutation (antiparallel

diode). The test fixtures to measure both events are given below in Figure 2 and Figure 3, respectively. Q1 and

Q2 represent the respective switch positions of the Wolfspeed BM half-bridge power module. Likewise, D1 and

D2 represent the antiparallel diodes of each switch position (the intrinsic body diode or external Schottky Diode

depending on the module variant). For both tests, film capacitors (CBulk) are used for bulk energy storage to

provide the needed energy transfer to the inductor (L) for the switching event, while high-frequency capacitors

(CHF) are used to provide a low-inductance switching loop. For MOSFET switching measurements in Figure 2, the

inductor is connected across the upper switch position of the module from the midpoint to the positive bus rail

while Q1 is held off and Q2 is pulsed; for diode switching measurements in Figure 3, the inductor is connected

across the lower switch position of the module to the negative bus rail while Q1 is pulsed and Q2 is held off.

FIGURE 2: CIL TEST FIXTURE USED TO MEASURE THE SWITCHING LOSS OF MOSFET Q2 (LOW-SIDE)

FIGURE 3: CIL TEST FIXTURE USED TO MEASURE THE SWITCHING LOSS OF ANTIPARALLEL DIODE D21

1Note: When Schottky diodes are present the “reverse recovery energy” is capacitive energy dissipated in the junction and

will dissipate heat through its respective thermal path.

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

EVALUATION BOARD CONTENTS

CAUTION

IT IS NOT NECESSARY FOR YOU TO TOUCH THE BOARD WHILE IT IS ENERGIZED. WHEN DEVICES

ARE BEING ATTACHED FOR TESTING, THE BOARD MUST BE DISCONNECTED FROM THE

ELECTRICAL SOURCE AND ALL BULK CAPACITORS MUCH BE FULLY DISCHARGED.

SOME COMPONENTS ON THE BOARD REACH TEMPERATURES ABOVE 50⁰ CELSIUS. THESE

CONDITIONS WILL CONTINUE AFTER THE ELECTRICAL SOURCE IS DISCONNECTED UNTIL THE

BULK CAPACITORS ARE FULLY DISCHARGED. DO NOT TOUCH THE BOARD WHEN IT IS ENERGIZED

AND ALLOW THE BULK CAPACITORS TO COMPLETELY DISCHARGE PRIOR TO HANDLING THE

BOARD.

PLEASE ENSURE THAT APPROPRIATE SAFETY PROCEDURES ARE FOLLOWED WHEN OPERATING

THIS BOARD AS SERIOUS INJURY, INCLUDING DEATH BY ELECTROCUTION OR SERIOUS INJURY BY

ELECTRICAL SHOCK OR ELECTRICAL BURNS, CAN OCCUR IF YOU DO NOT FOLLOW PROPER SAFETY

PRECAUTIONS.

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

警告

通电时不必接触板子。连接器件进行测试时，必须切断板子电源，且大容量电容器必须

释放完所有电荷。

板子上一些组件的温度可能超过

摄氏度。移除电源后，上述情况可能会短暂持续，

直至大容量电容器完全释放电荷。通电时禁止触摸板子，应在大容量电容器完全释放电

荷后，再操作电路板。

请确保在操作电路板时已经遵守了正确的安全规程，否则可能会造成严重伤害，包括触

电死亡、电击伤害、或电灼伤。

警告

通電している時にボードに接触する必要がありません。設備をつないで試験する時、

必ずボードの電源を切ってください。また、大容量のコンデンサーで電力を完全に釈

放してください。

ボードのモジュールの温度は

度以上になるかもしれません。電源を切った後、上

記の状況がしばらく持続する可能性がありますので、大容量のコンデンサーで電力を

完全に釈放するまで待ってください。通電している時にボードに接触するのは禁止で

す。大容量のコンデンサーで電力をまだ完全に釈放していない時、ボードを操作しな

いでください。

ボードを操作している時、正確な安全ルールを守っているのを確保してください。さ

もなければ、感電、電撃、厳しい火傷などの死傷が出る可能性があります。

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

Inductor

Connections

Bulk Capacitors

with HF on bottom

4-layer board to

provide low inductance

power planes

CVR

BM Module

Connections

Inductor midpoint

connection

The evaluation board, shown in Figure 4, contains most of the relevant components shown in each test

configuration above and provides several important features when characterizing the dynamic performance of

the Wolfspeed BM power module. These features consist of bulk capacitors, high-frequency capacitors, a high

bandwidth current measurement via a current viewing resistor (CVR), and Kelvin measurement points for high-

frequency drain-source voltage measurement. A list of the components utilized for testing is given below in Table

FIGURE 4: EVALUATION BOARD

TABLE 1: KIT-CRD-CIL17N-BM BILL OF MATERIALS

Item QTY Description Manufacturer Part Number

2 µF, 1.5 kV, Bulk Capacitor KEMET C4AQSBW5220A3NJ

2 30

047 µF, 1.5 kV, High-Frequency Capacitors TDK B32022B3473M000

3 1

5 mΩ, 400 MHz, Current Viewing Resistor T&M Research W-2-0025-4FC

Screw Terminals, 10

-32 Keystone 8196

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

CURRENT AND VOLTAGE SENSING

The current sensor utilized in this setup is a W Series Bar Strap Type, flat cable input CVR from T&M Research (W-

2-0025-4FC), shown in Figure 5. Note that the phenolic insulator has been shortened to be flush with the resistor

base. It has a bandpass of 400 MHz and a rise time of 2 ns. The large width and flat bolt-on structure allows it to

be placed in the high-frequency loop of the power module without introducing excessive parasitic inductance.

Since the CVR is connected to the grounded oscilloscope, the polarity of the CVR must be addressed by

connecting the case side of the CVR to the negative terminal of the module. This establishes a low-impedance

ground connection via the CVR’s BNC with a coaxial cable connected to the oscilloscope and terminated into

50 Ω. The coaxial cable should be constructed of high-quality materials. The actual measurement taken is the

voltage drop across the CVR; therefore, the channel attenuation can be set to 1/CVR(Ω) to get the direct current

measurement. Furthermore, since the negative terminal of the module has been established as ground, with the

case of the CVR connected at this point, the measured current is negative and should be inverted using the

oscilloscope’s MATH function to set the proper polarity.

A high-bandwidth oscilloscope is required to adequately capture the fast-switching transitions of SiC MOSFETs.

Before completing a CIL test, the oscilloscope and probes need to be compensated and deskewed.

Compensating the voltage probe ensures that the parasitics of the probe do not cause the measured step

responses to artificially appear under- or over-damped. Failure to compensate probes can result in differences

in energy loss calculations, rise and fall times, and peak overshoots. Deskewing probes ensure that the channels

and probes are synchronized in the time domain. Shifting waveforms in time, even by a few nanoseconds, can

significantly impact overall switching loss calculations.

FIGURE 5: T&M RESEARCH W-2-0025-4FC 2.5 mΩCVR

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

CVR Cabling and Termination

Although the CVR provides a high-quality measurement, it is also important to pair this with a high-quality

coaxial cable for the BNC connection on the CVR. This is even more important if low-resistance CVRs are utilized,

such as the one provided with this kit.

The use of low-loss coaxial cables with high-quality shields and dielectrics is recommended. High-quality cables

improve measurement performance by reducing sensitivity to external stray fields. For a direct BNC

measurement between the CVR and oscilloscope, a cable of similar performance to the Mini-Circuits® 141-24BM+

is recommended. It features a low loss and excellent return loss with high-frequency coverage. It is long enough

to enable measurement without requiring the oscilloscope to be placed extremely close to the test setup and is

hand-formable to reduce strain on cabling while still being capable of tight bends.

For even higher-quality measurement, a triple-shielded coaxial cable, such as the Mini-Circuits CBL-2FT-SMSM+

may be utilized. This cable is not as flexible or convenient but does provide an extremely high-quality

measurement. Unfortunately, this family of precision test cables does not have an option for BNC connectors;

only SMA connectors are available. Thus, an additional SMA-BNC adapter, such as the Mini-Circuits SF-BM50+, is

required on both ends of the cable to interface between the CVR and oscilloscope BNC connectors.

The oscilloscope channel used to measure the CVR’s voltage should also be properly configured. If directly using

a 50 Ω coaxial cable between the CVR and oscilloscope, the oscilloscope termination should be set to 50 Ω to

improve measurement accuracy. In an alternative configuration, an external feed-thru 50 Ω terminator, such as

the Tektronix® 011-0049-02, may be plugged between the coaxial cable and the oscilloscope BNC connector with

the oscilloscope termination set to 1 MΩ. This enables a similar level of accuracy but provides additional

protection for the oscilloscope channel as permissible voltage ranges are typically larger for a 1 MΩ termination.

INDUCTOR

The inductor utilized for testing Wolfspeed BM power modules should be sized to allow enough pulse resolution

(5-30 µs depending on bus voltage) to be able to reach switched current levels in the needed range (50-1060 A)

without running into bandwidth or time resolution issues of the chosen controller that actuates the gate signals.

Furthermore, shorter pulse durations keep the oscilloscope’s measurement time range small enough (<50 µs) to

achieve the highest sample rate. The oscilloscope has a limited buffer size, so a large inductor may result in a

reduced sample rate due to available memory. Keeping the current pulses short also minimizes the needed on-

board bulk energy storage and limits self-heating of the die due to long conduction periods. An air-core inductor

can be utilized to prevent saturation and should be shielded to prevent the magnetic field from coupling into

any sensitive measurement or control signals.

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

POWER SUPPLY

CAUTION

IT IS NOT NECESSARY FOR YOU TO TOUCH THE BOARD WHILE IT IS ENERGIZED. WHEN DEVICES

ARE BEING ATTACHED FOR TESTING, THE BOARD MUST BE DISCONNECTED FROM THE

ELECTRICAL SOURCE AND ALL BULK CAPACITORS MUCH BE FULLY DISCHARGED.

SOME COMPONENTS ON THE BOARD REACH TEMPERATURES ABOVE 50⁰ CELSIUS. THESE

CONDITIONS WILL CONTINUE AFTER THE ELECTRICAL SOURCE IS DISCONNECTED UNTIL THE

BULK CAPACITORS ARE FULLY DISCHARGED. DO NOT TOUCH THE BOARD WHEN IT IS ENERGIZED

AND ALLOW THE BULK CAPACITORS TO COMPLETELY DISCHARGE PRIOR TO HANDLING THE

BOARD.

PLEASE ENSURE THAT APPROPRIATE SAFETY PROCEDURES ARE FOLLOWED WHEN OPERATING

THIS BOARD AS SERIOUS INJURY, INCLUDING DEATH BY ELECTROCUTION OR SERIOUS INJURY BY

ELECTRICAL SHOCK OR ELECTRICAL BURNS, CAN OCCUR IF YOU DO NOT FOLLOW PROPER SAFETY

PRECAUTIONS.

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

警告

通电时不必接触板子。连接器件进行测试时，必须切断板子电源，且大容量电容器必须

释放完所有电荷。

板子上一些组件的温度可能超过

摄氏度。移除电源后，上述情况可能会短暂持续，

直至大容量电容器完全释放电荷。通电时禁止触摸板子，应在大容量电容器完全释放电

荷后，再操作电路板。

请确保在操作电路板时已经遵守了正确的安全规程，否则可能会造成严重伤害，包括触

电死亡、电击伤害、或电灼伤。

警告

通電している時にボードに接触する必要がありません。設備をつないで試験する時、

必ずボードの電源を切ってください。また、大容量のコンデンサーで電力を完全に釈

放してください。

ボードのモジュールの温度は

度以上になるかもしれません。電源を切った後、上

記の状況がしばらく持続する可能性がありますので、大容量のコンデンサーで電力を

完全に釈放するまで待ってください。通電している時にボードに接触するのは禁止で

す。大容量のコンデンサーで電力をまだ完全に釈放していない時、ボードを操作しな

いでください。

ボードを操作している時、正確な安全ルールを守っているのを確保してください。さ

もなければ、感電、電撃、厳しい火傷などの死傷が出る可能性があります。

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

The suggested high-voltage power supply utilized is a 2 kV, 150 mA, non-isolated supply from Glassman High

Voltage® (PS/FR2P150). This provides a low-cost solution that inherently does not have a large amount of energy

storage. However, since it is non-isolated, high-voltage relays are needed to open the ground loops formed due

to the measurement circuitry and to charge/discharge the bulk energy storage. If ground loops are not properly

removed, the resulting measurements will be significantly impacted. For safety, normally-closed relays should

be used in case of a loss of control power. Furthermore, a large bleed-off resistance is connected directly across

the bulk capacitors on the evaluation board PCB to slowly discharge the energy storage to a safe level. Three

relays are used to create the three operating states required to complete a CIL test: CHARGE, TEST and

DISCHARGE. Each operating state is further explained below. The CIL test fixture schematic with the addition of

the high-voltage power supply and high-voltage relays is given for each respective operating state in Figure 7,

Figure 8, and Figure 9.

Note that the test fixture schematic shown is for MOSFET switching analysis, but it is also applicable to body

diode switching analysis where the inductor is connected across Q2.

FIGURE 6: GLASSMAN HIGH VOLTAGE PS/FR2P150 NON-ISOLATED POWER SUPPLY

CHARGE– Relay 1 and Relay 3 are CLOSED to enable charging of the bus bulk capacitors. A ground loop is formed

via the non-isolated power supply return and ground reference established by the oscilloscope. Once the bus is

charged, the transition to the TEST state can be made.

FIGURE 7: CIL TEST FIXTURE SCHEMATIC DURING THE CHARGE STATE

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

TEST – All relays are OPEN, removing the ground loop and referencing the test circuit to the established ground

connection made via the oscilloscope. The CIL test can then be performed. Once the test is complete, the

transition to the DISCHARGE state can be made, or the transition to the CHARGE state can be made to perform

additional testing without discharging the bus capacitors.

FIGURE 8: CIL TEST FIXTURE SCHEMATIC DURING THE TEST STATE.

DISCHARGE – In the final state, all relays are CLOSED to discharge the dc bus bulk capacitors and output

capacitance of the high-voltage power supply via the Discharge Resistor. Proper sizing of the Discharge Resistor

should be considered in terms of power dissipation and the time required to discharge.

FIGURE 9: CIL TEST FIXTURE SCHEMATIC DURING THE DISCHARGE STATE

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

GATE DRIVER

The companion BM gate driver (CGD1700HB2P-BM) is shown below in Figure 10. It is a direct mount, dual-

channel isolated gate driver that is optimized for Wolfspeed’s BM3 half-bridge power module. For input/output

connections and other general information regarding the use or functionality of the gate driver, please refer to

the CGD1700HB2P-BM datasheet.

FIGURE 10:CGD1700HB2P-BM DUAL CHANNEL DIFFERENTIAL ISOLATED GATE DRIVER

Voltage Sensing

Test points are included on the evaluation board to facilitate measuring the Gate-Source voltage for all switch

positions. Standard test points for the Gate and Source terminals of all switch positions can be used with high-

bandwidth, isolated differential voltage probes. An MMCX connector is also provided for a high-frequency, low-

noise measurement with suitable probes such as the Tektronix TIVP1®.

REVISION HISTORY

TABLE 2: REVISION HISTORY

Date Revision Changes

Febuary 2023 Rev. 1 1st Issue

PRD-07123 REV. 1, February 2023 KIT-CRD-CIL17N-BM: CIL Evaluation Kit for Wolfspeed BM Module Users

are trademarks of Wolfspeed, Inc. Other trademarks, products, and company names are the property of their respective owners

and do not imply specific product and/or vendor endorsement, sponsorship, or association.

IMPORTANT NOTES

PURPOSES AND USE

Wolfspeed, Inc. (on behalf of itself and its affiliates, “Wolfspeed”) reserves the right in its sole discretion to make

corrections, enhancements, improvements, or other changes to the board or to discontinue the board.

THE BOARD DESCRIBED IS AN ENGINEERING TOOL INTENDED SOLELY FOR LABORATORY USE BY HIGHLY

QUALIFIED AND EXPERIENCED ELECTRICAL ENGINEERS TO EVALUATE THE PERFORMANCE OF WOLFSPEED

POWER SWITCHING DEVICES. THE BOARD SHOULD NOT BE USED AS ALL OR PART OF A FINISHED PRODUCT.

THIS BOARD IS NOT SUITABLE FOR SALE TO OR USE BY CONSUMERS AND CAN BE HIGHLY DANGEROUS IF NOT

USED PROPERLY. THIS BOARD IS NOT DESIGNED OR INTENDED TO BE INCORPORATED INTO ANY OTHER

PRODUCT FOR RESALE. THE USER SHOULD CAREFULLY REVIEW THE DOCUMENT TO WHICH THESE

NOTIFICATIONS ARE ATTACHED AND OTHER WRITTEN USER DOCUMENTATION THAT MAY BE PROVIDED BY

WOLFSPEED (TOGETHER, THE “DOCUMENTATION”) PRIOR TO USE. USE OF THIS BOARD IS AT THE USER’S SOLE

RISK.

OPERATION OF BOARD

It is important to operate the board within Wolfspeed’s recommended specifications and environmental

considerations as described in the Documentation. Exceeding specified ratings (such as input and output

voltage, current, power, or environmental ranges) may cause property damage. If you have questions about

these ratings, please contact Wolfspeed prior to connecting interface electronics (including input power and

intended loads). Any loads applied outside of a specified output range may result in adverse consequences,

including unintended or inaccurate evaluations or possible permanent damage to the board or its interfaced

electronics. Please consult the Documentation prior to connecting any load to the board. If you have any

questions about load specifications for the board, please contact Wolfspeed at forum.wolfspeed.com for

assistance.

Users should ensure that appropriate safety procedures are followed when working with the board as serious

injury, including death by electrocution or serious injury by electrical shock or electrical burns can occur if you

do not follow proper safety precautions. It is not necessary in proper operation for the user to touch the board

while it is energized. When devices are being attached to the board for testing, the board must be disconnected

from the electrical source and any bulk capacitors must be fully discharged. When the board is connected to an

electrical source and for a short time thereafter until board components are fully discharged, some board

components will be electrically charged and/or have temperatures greater than 50˚ Celsius. These components

may include bulk capacitors, connectors, linear regulators, switching transistors, heatsinks, resistors and SiC

diodes that can be identified using board schematic. Users should contact Wolfspeed for assistance if a board

schematic is not included in the Documentation or if users have questions about a board’s components. When

operating the board, users should be aware that these components will be hot and could electrocute or

electrically shock the user. As with all electronic evaluation tools, only qualified personnel knowledgeable in

handling electronic performance evaluation, measurement, and diagnostic tools should use the board.

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