A parameter optimization method of snubber circuit of thyristor under pulse current working condition

Wei Tong; Hua Li; Peng Fu; Kun Wang; Ul Hassan Mahmood; Zhiquan Song

doi:10.11884/HPLPB202032.190280

Journals >High Power Laser and Particle Beams >Volume 32 >Issue 2 >Page 025015 > Article

High Power Laser and Particle Beams
Vol. 32, Issue 2, 025015 (2020)

A parameter optimization method of snubber circuit of thyristor under pulse current working condition

Wei Tong^1,1,2,2, Hua Li^1,1, Peng Fu^1,1, Kun Wang^1,1,2,2..., Ul Hassan Mahmood^1,1 and Zhiquan Song^1,1,*|Show fewer author(s)

Author Affiliations

¹Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

²Science Island Branch, University of Science and Technology of China, Hefei 230026, China

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DOI: 10.11884/HPLPB202032.190280 Cite this Article

Wei Tong, Hua Li, Peng Fu, Kun Wang, Ul Hassan Mahmood, Zhiquan Song. A parameter optimization method of snubber circuit of thyristor under pulse current working condition[J]. High Power Laser and Particle Beams, 2020, 32(2): 025015 Copy Citation Text

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Fig. 1. Simplified commutation diagram of quench protection system (QPS)

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Fig. 2. Exponential function model指数型模型波形图

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Fig. 3. Test circuit for thyristor reverse recovery characteristic脉冲工况下晶闸管测试实验电路图

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Fig. 4. Equivalent circuit diagram of snubber circuit during the reverse recovery process

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Fig. 5. Peak value of V_dmax under various set of R_s and C_s.

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Fig. 6. Peak value of dV_d/dt under various set of R_s and C_s

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Fig. 7. Peak value of dV_d/dt as a function of R_s

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Fig. 8. Peak value of V_d as a function of R_s and C_s

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Fig. 9. Comparison of reverse recovery current and voltage waveforms

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charge voltage/V	I_p/A	I_RM/A	di/dt/ (A·µs⁻¹)	Q_rr/µC
1 000	6 622	895	37.10	8 057.3
1 500	9 935	967	50.96	8 412.8
2 000	13 250	1 100	76.54	9 049.2
2 500	16 560	1 206	97.41	9 568.7
3 000	19 880	1 330	121.22	10 153.0
3 500	23 190	1 402	135.97	10 505.4
4 000	26 500	1 523	160.26	11 076.2
4 500	29 810	1 627	179.44	11 517.1
5 000	33 160	1 738	198.98	11 962.4
5 500	36 480	1 846	221.88	12 471.5
6 000	39 790	1 915	238.76	12 849.6
6 500	43 090	2 014	256.90	13 244.7
7 000	46 380	2 132	279.01	13 715.9
7 500	49 880	2 230	298.37	14 122.1

Table 1. Specific characteristics of thyristor during reverse recovery process

symbol	parameter	value
L/µH	external inductance	25
V_dRM, V_RRM/V	max. repetitive peak forward and reverse blocking voltage of chosen thyristor	5 200
dV_d/dt_crit/(V·µs^－1)	critical rate of rise of commutating voltage of chosen thyristor(di/dt=500 A/µs, T_vj=125 ℃)	3 000
I_RM/A	peak value of reverse recovery current (di/dt=500 A/µs, T_vj=125 ℃)	1 825.7
N_S	thyristor series number	2

Table 2. Design specification of RC snubber circuit for QPS in LSTF

symbol	parameter	value
R_s/Ω	Snubber Resistance	11.3
C_s/μF	Snubber Capacitance	0.8
V_dmax/V	Maximum Reverse Recovery Voltage	6 210
(dV_d/dt)_max/(V·μs⁻¹)	Maximum V_d change rate	3 600

Table 3. The optimum R_s, C_s and corresponding circuit parameters

	optimum parameters	Practical parameters
I_RM /A)	1 815	1 835
(di/dt)₀/(A·s^－1)	309×10⁶	307×10⁶
v_dmax/V	6 168	6 960
(dV_d/dt)_max /(V·µs^－1)	3 598	6 285

Table 4. Comparison of electrical parameters

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