. Author manuscript; available in PMC: 2021 Apr 14.

Published in final edited form as: IEEE Trans Biomed Eng. 2020 Sep 18;PP:10.1109/TBME.2020.3024902. doi: 10.1109/TBME.2020.3024902

Table I. Key Components of the PTMS.

Component	Assignment	Nominal Rating	Part Number	Manufacturer
T	Step-up transformer	Output: 1 kV,10 A Class-E insulation	Custom manufactured	Eastern Transformers, UK
Rectifier	Full bridge diode rectifier	1200 V, Ultrafast recovery diode I_FRM ^a = 600 A	STTH9012TV1	STMicroelectronics
R_DC	Charging resistor	2x 47 Ω, thick-film on steel 2.5 kV, 1.5 kW (parallel)	WDBR1-47RKT	TT ELECTRONICS
C_DC	Energy storage	10000 μF, 500 VDC Aluminum capacitor	ALS70A103NT500	KEMET Electronics
Q1-Q4	IGBT power switch	1.2 kV I_CRM ^b = 1.8 kA Q_G = 3.45 µC	SEMiX603GB12E4p	Semikron
D	Free-wheeling diode (included in the IGBT module)	1.2 kV I_FRM ^c = 1.8 kA	SEMiX603GB12E4p	Semikron
C	Snubber capacitor	2 µF, Polypropylene film capacitor	205PPA122K	Illinois Capacitor
R	Snubber resistor	1Ω, non-Inductive film resistor	AP821 1R F	Arcol
Scale 2+ driver core	Gate driver core	VGE_on= 15 V, VGE_off= -8 V, I_G = 6A.	2SC0106T2A1-12	Power Integrations
R_E	Emitter resistor	500 mΩ,	AP821 R5 J	Arcol
L	Stimulation coil	15.5 µH	D70 Remote Coil	Magstim
ctrl	Digital controller	PWM generation resolution: 10 ns	MicroLabBox, includes Power PC Dual Core 2 GHz processor, DS1202, DS1302 I/O	dSPACE

^a)

Repetitive peak forward current, tp = 5 µs, F= 5 kHz square

^b)

Peak current value at collector output during pulse operation.

^C)

Repetitive peak forward current of the free-wheeling diode.