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Registered Member #16018
Joined: Fri May 03 2013, 07:19PM
Location:
Posts: 53
I would like to know how to build one of the simplest but most powerful version of the half bridge flyback driver and I think dr dark current could help me because he has made a half bride before also I don't have an O-scope. Is the half bridge better than the zvs Thanks
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Hi, I used the IR2153 control IC, which is not really that great. A better way is to use an oscillator (eg. 4047), a gate driver (eg. a pair of UCC drivers) and a GDT. The half bridge driver has advantages and disadvantages over the "zvs" driver. Its advantage is that the transistors see only 1x Vin, the disadvantage is that the transistors need to switch the reactive current and there is no zero voltage switching (=large switching losses). Transistors in the "zvs", on the other hand, switch only the real input power, but see pi-times the input voltage.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Mr.Plasma-CRAZY wrote ...
i dont know to much about flybacks and i was wondering what gate driver and chip i could use also thanks for the reply.
If you are just driving a half-bridge or full-bridge open loop (i.e. no feedback), you can just use a 555 timer, TL494 PWM controller (a generic, easy to use PWM controller IC), or any other PWM type IC.
As far as gate driver goes, the more popular ones are the UCC37322 and UCC37321 which are 9A gate drivers.
Registered Member #3395
Joined: Thu Nov 04 2010, 08:42AM
Location: Christchurch, New Zealand
Posts: 193
Dr. Dark Current wrote ...
Hi, I used the IR2153 control IC, which is not really that great. A better way is to use an oscillator (eg. 4047), a gate driver (eg. a pair of UCC drivers) and a GDT. The half bridge driver has advantages and disadvantages over the "zvs" driver. Its advantage is that the transistors see only 1x Vin, the disadvantage is that the transistors need to switch the reactive current and there is no zero voltage switching (=large switching losses). Transistors in the "zvs", on the other hand, switch only the real input power, but see pi-times the input voltage.
Sorry to interrupt, but in the ZVS driver why do the transistors see pi times the input voltage? I know it's something to do in the waveform but my limited knowledge is stopping me... I've always wondered why the ZVS schematic said "use semiconductors with a VDS rating of almost 4x the supply voltage". I not sure how you could gain a voltage higher than the input voltage (apart from a voltage multiplier or similar).
Registered Member #4074
Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
Jozef C wrote ...
Sorry to interrupt, but in the ZVS driver why do the transistors see pi times the input voltage? I know it's something to do in the waveform but my limited knowledge is stopping me... I've always wondered why the ZVS schematic said "use semiconductors with a VDS rating of almost 4x the supply voltage". I not sure how you could gain a voltage higher than the input voltage (apart from a voltage multiplier or similar).
Don't quote me on this, but I think the higher voltage appears across the primary tank (primary coil and cap) due to resonant rise, since the transistors are switching at the circuit's resonant frequency.
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Half bridge flyback driver
