PMID- 36850547
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20230228
LR  - 20230301
IS  - 1424-8220 (Electronic)
IS  - 1424-8220 (Linking)
VI  - 23
IP  - 4
DP  - 2023 Feb 9
TI  - A Nine-Level Inverter with Adjustable Turn-Off Time for Helicopter Transient 
      Electromagnetic Detection.
LID - 10.3390/s23041950 [doi]
LID - 1950
AB  - The current inverter is the core component of the helicopter transient 
      electromagnetic (HTEM) detection system. It should meet the concerns of low loss, 
      high power, and fast turn-OFF time. This article proposes a new circuit topology 
      based on nine-level inverter technology to overcome the drawbacks of typical PWM 
      (pulse width modulation) inverters, such as switching losses and harmonics. This 
      circuit topology overcomes the shortcomings of the traditional single constant 
      voltage clamp circuit in which the turn-OFF time is not adjustable. Using an 
      inverter with the proposed topology is able to avoid the complex PWM control 
      method and switching loss. In this way, the current rising edge and falling edge 
      of this inverter are also improved effectively. The proposed inverter has 
      adjustable turn-ON-time and turn-OFF time, which is significantly different from 
      the conventional single-clamp inverter. Through subsequent experiments, the 
      inverter proved to have the capability of generating trapezoidal current 
      waveforms. Moreover, by modifying the FPGA (Field Programmable Gate Array) 
      control program, three different turn-OFF times are achieved. The nine-level 
      inverter has a peak current of 1.5 A with an adjustable turn-OFF time from 129 mus 
      to 162 mus. Moreover, the switching frequency of the inverter is reduced from 10 
      kHz to below 100 Hz. The experimental results further demonstrate that it 
      achieves lower switching losses and more flexible transmission. Our work in this 
      article provides an efficient way to improve the performance of HTEM detection 
      systems.
FAU - Peng, Fengjiang
AU  - Peng F
AD  - School of Resources and Environment, University of Electronic Science and 
      Technology of China, Chengdu 611731, China.
FAU - Guo, Cheng
AU  - Guo C
AD  - School of Resources and Environment, University of Electronic Science and 
      Technology of China, Chengdu 611731, China.
FAU - Chang, Zhu
AU  - Chang Z
AD  - School of Resources and Environment, University of Electronic Science and 
      Technology of China, Chengdu 611731, China.
FAU - Yan, Zilong
AU  - Yan Z
AD  - School of Resources and Environment, University of Electronic Science and 
      Technology of China, Chengdu 611731, China.
FAU - Zhao, Qing
AU  - Zhao Q
AD  - School of Resources and Environment, University of Electronic Science and 
      Technology of China, Chengdu 611731, China.
FAU - Huang, Xiaoping
AU  - Huang X
AUID- ORCID: 0000-0002-1996-9335
AD  - School of Resources and Environment, University of Electronic Science and 
      Technology of China, Chengdu 611731, China.
LA  - eng
GR  - 2021YFG0369, 5700-202127198A-0-0-00/Key R D project of Sichuan Provincial 
      De-partment of science and technology (No. 2021YFG0369) and State Grid science 
      and technology project (No. 5700-202127198A-0-0-00)/
PT  - Journal Article
DEP - 20230209
PL  - Switzerland
TA  - Sensors (Basel)
JT  - Sensors (Basel, Switzerland)
JID - 101204366
SB  - IM
PMC - PMC9963804
OTO - NOTNLM
OT  - adjustable turn-OFF time
OT  - inverter
OT  - transient electromagnetic detection
COIS- The authors declare no conflict of interest.
EDAT- 2023/03/01 06:00
MHDA- 2023/03/01 06:01
PMCR- 2023/02/09
CRDT- 2023/02/28 01:17
PHST- 2022/12/02 00:00 [received]
PHST- 2023/01/01 00:00 [revised]
PHST- 2023/01/06 00:00 [accepted]
PHST- 2023/02/28 01:17 [entrez]
PHST- 2023/03/01 06:00 [pubmed]
PHST- 2023/03/01 06:01 [medline]
PHST- 2023/02/09 00:00 [pmc-release]
AID - s23041950 [pii]
AID - sensors-23-01950 [pii]
AID - 10.3390/s23041950 [doi]
PST - epublish
SO  - Sensors (Basel). 2023 Feb 9;23(4):1950. doi: 10.3390/s23041950.