Author Topic: Interesting self-oscillating half-bridge article  (Read 579 times)

Offline profdc9

  • High Voltage Engineer
  • ****
  • Posts: 262
  • Karma: +14/-0
    • View Profile
Interesting self-oscillating half-bridge article
« on: December 27, 2020, 05:45:41 PM »
I found this interesting self-oscillating half-bridge article

Bal, G., Oncu, S., & Ozbas, E. (2013). Self-Oscillated Induction Heater for Absorption Cooler. Elektronika Ir Elektrotechnika, 19(10), 45-48. https://doi.org/10.5755/j01.eee.19.10.5894

https://eejournal.ktu.lt/index.php/elt/article/view/5894

It uses a gate drive transformer in series with the load to drive the gates of the half bridge, with the two upper and lower gates being driven in opposite phases.  An inductor Lss (see figure 1) is included so that the oscillation frequency is somewhat higher than the resonance frequency, achieving ZVS.

It looks like a particularly simple setup for a self-oscillating half bridge.  If anyone has experience with this perhaps they could comment?

Offline davekni

  • High Voltage Expert
  • ******
  • Posts: 1178
  • Karma: +57/-0
  • Physicist, engineer (electronic), and hobbiest
    • View Profile
Re: Interesting self-oscillating half-bridge article
« Reply #1 on: December 27, 2020, 08:53:32 PM »
First time I've seen that circuit implemented with IGBTs.  I've used it in both half and full bridges with BJTs.  For BJTs, that simple circuit is convenient.  CT ratio defines the forced-beta.  With a 10:1 CT, base current is always 10% of collector current.  I've heard that some CFLs use the BJT version.
David Knierim

Offline profdc9

  • High Voltage Engineer
  • ****
  • Posts: 262
  • Karma: +14/-0
    • View Profile
Re: Interesting self-oscillating half-bridge article
« Reply #2 on: January 01, 2021, 08:19:33 PM »
For a full-bridge version of this, does one do the obvious thing and just feed the two halves of the bridge with opposite phases of the gate transformer?  And is the current limited in the circuit mostly by shifting the oscillation frequency to be further above resonance, as it does not appear that a series inductor with the load can be used to limit the current because the resonance frequency and therefore oscillation frequency will shift down accordingly?

First time I've seen that circuit implemented with IGBTs.  I've used it in both half and full bridges with BJTs.  For BJTs, that simple circuit is convenient.  CT ratio defines the forced-beta.  With a 10:1 CT, base current is always 10% of collector current.  I've heard that some CFLs use the BJT version.

Offline davekni

  • High Voltage Expert
  • ******
  • Posts: 1178
  • Karma: +57/-0
  • Physicist, engineer (electronic), and hobbiest
    • View Profile
Re: Interesting self-oscillating half-bridge article
« Reply #3 on: January 02, 2021, 01:08:54 AM »
"R" of the induction coil is the only current limiting.  It is a series-resonant circuit.  A high-Q load will draw high current.

Yes, I think adding two more GDT windings is all it would take for this design.  (For the BJT version, another CT is needed, with primaries in series.  That is because BJTs are current-driven.  Two more windings on the same core would make equal Vbe, which won't necessarily insure sufficiently-equal base currents.  I've built full-bridge BJT bridges like this, but not even a half-bridge using IGBTs, yet.)
David Knierim

High Voltage Forum

Re: Interesting self-oscillating half-bridge article
« Reply #3 on: January 02, 2021, 01:08:54 AM »

 


* Recent Topics and Posts

post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
Today at 01:06:02 AM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
Today at 12:44:31 AM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
Today at 12:41:33 AM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
Today at 12:11:13 AM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 13, 2021, 11:52:11 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 13, 2021, 11:38:44 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 13, 2021, 10:26:51 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 13, 2021, 09:57:56 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 13, 2021, 09:29:08 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 13, 2021, 08:53:25 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 13, 2021, 07:22:05 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 13, 2021, 07:02:28 PM
post Re: HFSSTC with fixed crystal-controlled frequency
[Solid State Tesla Coils (SSTC)]
Steve Ward
June 13, 2021, 06:25:20 PM
post First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 13, 2021, 02:48:59 PM
post OpenTheremin v3 loosing calibration after minutes
[Electronic Circuits]
gianpaolo
June 13, 2021, 12:00:09 PM
post Re: What is the guidence on SpaceX rockets based on ? PID's?
[General Chat]
Mads Barnkob
June 12, 2021, 07:28:03 PM
post Re: Rocket engine questions
[General Chat]
klugesmith
June 12, 2021, 07:23:12 PM
post Re: Rocket engine questions
[General Chat]
rikkitikkitavi
June 12, 2021, 12:24:06 PM
post Re: Nice PC Board Tesla
[Solid State Tesla Coils (SSTC)]
Da_Stier
June 12, 2021, 10:06:18 AM
post Re: Rocket engine questions
[General Chat]
plasma
June 12, 2021, 10:01:29 AM
post Re: Nice PC Board Tesla
[Solid State Tesla Coils (SSTC)]
Twospoons
June 12, 2021, 08:47:08 AM
post Re: What is the guidence on SpaceX rockets based on ? PID's?
[General Chat]
Patrick
June 12, 2021, 07:03:10 AM
post Re: Complications in the design of the first DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
PEDRO HENRIQUE
June 12, 2021, 06:42:56 AM
post Re: Nice PC Board Tesla
[Solid State Tesla Coils (SSTC)]
davekni
June 12, 2021, 04:20:53 AM
post Re: SKM100 Mini DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Willsmith001
June 11, 2021, 11:08:24 PM
post Re: How much propagation delay is too much propagation delay
[General Chat]
Willsmith001
June 11, 2021, 11:07:00 PM
post Re: Nice PC Board Tesla
[Solid State Tesla Coils (SSTC)]
Da_Stier
June 11, 2021, 12:33:55 PM
post Re: Nice PC Board Tesla
[Solid State Tesla Coils (SSTC)]
futurist
June 11, 2021, 12:03:24 PM
post Re: How much propagation delay is too much propagation delay
[General Chat]
davekni
June 11, 2021, 06:47:52 AM
post Re: How much propagation delay is too much propagation delay
[General Chat]
Power-Max
June 11, 2021, 06:32:02 AM
post Re: How much propagation delay is too much propagation delay
[General Chat]
davekni
June 11, 2021, 05:16:03 AM
post Re: SKM100 Mini DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 11, 2021, 04:53:50 AM
post Re: Why are SGT50T65FD1PN soo cheap on lcsc?
[General Chat]
Hydron
June 10, 2021, 11:51:17 PM
post Re: Rocket engine questions
[General Chat]
MRMILSTAR
June 10, 2021, 09:52:59 PM
post Re: Rocket engine questions
[General Chat]
Patrick
June 10, 2021, 09:16:25 PM
post Re: Why are SGT50T65FD1PN soo cheap on lcsc?
[General Chat]
Weston
June 10, 2021, 08:19:40 PM
post Fujifilm PMT module PMT12A, reverse engineering
[Detection, Counting and Measurements]
Mads Barnkob
June 10, 2021, 08:05:27 PM
post Nice PC Board Tesla
[Solid State Tesla Coils (SSTC)]
alan sailer
June 10, 2021, 07:46:12 PM
post Re: Is it possible to go fully CW with a DRSSRC?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Uspring
June 10, 2021, 06:31:40 PM
post Re: Why are SGT50T65FD1PN soo cheap on lcsc?
[General Chat]
rikkitikkitavi
June 10, 2021, 02:12:07 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
T3sl4co1l
June 10, 2021, 05:14:41 AM
post How much propagation delay is too much propagation delay
[General Chat]
Power-Max
June 10, 2021, 05:10:24 AM
post Re: Why are SGT50T65FD1PN soo cheap on lcsc?
[General Chat]
Power-Max
June 10, 2021, 04:50:34 AM
post Re: SKM100 Mini DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
June 10, 2021, 01:36:31 AM
post Re: Why are SGT50T65FD1PN soo cheap on lcsc?
[General Chat]
Steve Ward
June 09, 2021, 09:15:22 PM
post Re: Is it possible to go fully CW with a DRSSRC?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Power-Max
June 09, 2021, 08:02:15 PM
post Re: Complications in the design of the first DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
PEDRO HENRIQUE
June 09, 2021, 07:17:27 PM
post Re: Analog HFBR amplifier
[Electronic Circuits]
Max
June 09, 2021, 06:58:33 PM
post Aisler PCB Manufacturer
[Printed Circuit Board]
Max
June 09, 2021, 06:58:12 PM
post [WTS] (US) Large Ferrite U and E Cores, assorted types
[Sell / Buy / Trade]
Steve Ward
June 09, 2021, 05:44:06 PM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
SimplePortal 2.3.6 © 2008-2014, SimplePortal