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Registered Member #3964
Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
Hi Mr. Black,
Great build! Great Coil!
Few suggestions: 1. I watched the video, and I heard squeals of the buck... do you know the freq of your PWM? It should be above 20 khz where humans cannot hear anymore. Can you increase it? 2. 350 Vdc is your ramp peak or DC before buck peak? You may want to increase effective inverter impedance 3. I use 10mf on my 24v rails with 1 amp 24v transformer.. I had no problems with it.
Registered Member #3960
Joined: Mon Jun 20 2011, 06:27AM
Location: Wuhan Hubei China
Posts: 33
zrg wrote ...
To properly drive a double H-bridge of 50B60 at 350-400 kHz you may need at least 24V 3A power supply, no matter the driver schematics. And yes, additional power supply capacitors may be necessary in any case.
It may have to be replaced by SMPS, which can provide a greater power.
Registered Member #3960
Joined: Mon Jun 20 2011, 06:27AM
Location: Wuhan Hubei China
Posts: 33
zzz_julian_zzz wrote ...
Hi Mr. Black,
Great build! Great Coil!
Few suggestions: 1. I watched the video, and I heard squeals of the buck... do you know the freq of your PWM? It should be above 20 khz where humans cannot hear anymore. Can you increase it? 2. 350 Vdc is your ramp peak or DC before buck peak? You may want to increase effective inverter impedance 3. I use 10mf on my 24v rails with 1 amp 24v transformer.. I had no problems with it.
Hi Julian Thank you for your compliment I answer these questions. 1：I used the frequency of PWM in 10KHz.So you can hear some squeals. 2：Yes.because the MMC capacity is fixed, the impedance is relatively large. 350V is the BUCK input voltage. 3.So, big 10MF capacity!. I think I should make some changes on the PCB in order to adapt to such a large package.
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