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4hv.org :: Forums :: Tesla Coils
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A Small QCWDRSSTC

1 2 
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Mr.Black
Sat Jul 23 2016, 06:53PM Print
Mr.Black Registered Member #3960 Joined: Mon Jun 20 2011, 06:27AM
Location: Wuhan Hubei China
Posts: 33
I built a QCWDRSSTC idea is from a few years ago, at that time saw the QCWDRSSTC STEVE WARD, shocked at such a small coil can produce such a huge arc. amazed
Last month, have more free time, he began building QCWDRSSTC plan.
In the beginning, I needed a viable option selected.
I made reference to Gaoguangyan's UD2.7, redesigned UVLO section.
Because in China it is difficult to buy LM8385, so changed to use the LM311 comparator circuit configuration. cheesey
For the same reason, I will IFD95 DLR1150 changed to fiber optic receiver, it is often used to transmit signals of the elevator system.
Compared with HFBR2414, its anti-interference ability is poor, need to make EMC shielding measures.
Another change is the addition of an interrupt signal inverting input selection, I passed a jumper to select reverse phase interrupt signal, so that the driving circuit is adapted to BNC or twisted pair signal input.
As the modifications for UD2.7C, I put a new circuit named UD2.8A.

1469298965 3960 FT0 Ud28a

Here]qdriver2.8a.pdf[/file] PDF format schematics
I used to draw altiumDesigner10.0 the PCB, and the factory proofing.

1469298507 3960 FT0 3cb11fbf5c359c12fe21e1312f024732

1469298706 3960 FT0 3987fcae24cb68204d04b2a9172bb0cd

Thanks STEVE and Gaoguangyan sharing of their design so I learned a lot. angry
-
I use 50B60PD1 in the full bridge, and the use of four CBB22 capacitor connected in parallel bus.

1469298864 3960 FT0 Qq20160721135441

Put them together, there is the following effect.

1469299109 3960 FT0 Qq20160721135211


1469299128 3960 FT0 Qq20160721135320

data:
The arc length of about 1.1 ~ 1.2m
BUS voltage:Ramp 10-350V
ONtime:14.5mS
OCD set:160A running in 140~150A.
Video sharing in youtube, using my Iphone5S record, unfortunately, drop-frame is still very serious.




I can get this arc feeling very happy, but I do not know why the arc is not straight,but from the same arc shape and branches fork.
I run my system at 380KHz, the longest arc frequency of 320KHz, according to the general theory, the higher the frequency, the more direct the arc, but it seems the results of my experiment is not the case. suprised
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woodchuck
Sun Jul 24 2016, 04:17AM
woodchuck Registered Member #39190 Joined: Sat Oct 26 2013, 09:15AM
Location: Boise National Forest
Posts: 65
Looks great! Great build quality, too.
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Mr.Black
Sun Jul 24 2016, 05:21AM
Mr.Black Registered Member #3960 Joined: Mon Jun 20 2011, 06:27AM
Location: Wuhan Hubei China
Posts: 33
woodchuck wrote ...

Looks great! Great build quality, too.
thanks! tongue
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Mr.Black
Sun Jul 24 2016, 08:10AM
Mr.Black Registered Member #3960 Joined: Mon Jun 20 2011, 06:27AM
Location: Wuhan Hubei China
Posts: 33
Introduce my interrupt circuit.
It uses a STM8S103K4T6 microcontroller TIM2 & TIM3 generate modulated PWM waveform, the fundamental frequency of 10.0KHz.
The offtime by TIM4 control.
Its frequency 16.0MHz reference oscillator 16 by the frequency division obtained.
So stability is very close to pure hardware circuit in actual use has been very good results.
1469346995 3960 FT177382 11722aac366375237cb6cf9e707235a7

You can see in the picture on the left is using a charging cable T4056 program, which can be built-in rechargeable lithium battery, the price of this module is very cheap, just as 2.3RMB, about 0.3USD. But the function is perfect.

1469347175 3960 FT177382 E57fd6edbdcaac7b37ca9e9863b65b78

Interrupt internal structure is very simple circuit uses 4.2V cell phone lithium battery as a power source, UMT3608 module will boost battery voltage to a constant 5V. STM8 ADC in the way resources are allocated to lithium batteries, as low voltage alarm. The switch is connected to ensure that the plug-in interface when charging, disconnect the power supply circuit to prevent charging circuit with low voltage detection mutually interfering.
-
The core of the program lies in the following functions:
typedef struct {
  
  uint  S_ontime;   //per100us 10-250(1ms-25ms)<*100> 
  uint  S_offtime;   //pr100ms  2-50(0.2s-5s)</10> 
  uint  S_top;      //top(%)10~200(5%-100%)</2>
  uint  S_scale;    //scale = rise/rise+fall time 10~190(5%-95%)</2>
  
}Slope_param_info;
/*global struct info*/
Slope_param_info SPARAMINFO ={100,2,200,180};
/* CUT LINE */
void Reload_Slope_Table(Slope_param_info SPF_info)
{
  static uint S_risetime,S_falltime;
  static float Ua,Fa;
    S_risetime=(uint)(SPF_info.S_ontime*SPF_info.S_scale/200);//(100uS)
    S_falltime =(uint)(SPF_info.S_ontime-S_risetime);//(100uS)
    Ua=(float)(SPF_info.S_top/S_risetime);//bit
    Fa=(float)(SPF_info.S_top/S_falltime);//bit
  for(uint i=1;i<250;i++)
    {
       if(i<S_risetime)
        {
           if((SPF_info.S_top-Slope_Table[i-1])<Ua)
            {
              Slope_Table[i]=SPF_info.S_top;
            }
           else
              Slope_Table[i]=(uint)(Slope_Table[i-1]+Ua);
        }
       if(i>=S_risetime)
        {
           if(Slope_Table[i-1]<Fa)
            {
              Slope_Table[i]=0;
              goto end_table;
            }
           else
              Slope_Table[i]=(uint)(Slope_Table[i-1]-Fa);
        }
    }
    end_table:
    return ;
}
The core of the program lies in the following functions:
The code is very simple, the structure of the four parameters of the sawtooth abstraction, void Reload_Slope_Table (Slope_param_info SPF_info) function put the sawtooth waveform data into 250 points, stored in Slope_Table [250] a weft array.
In TIM2 update interrupt, load Slope_Table [250] can be achieved sawtooth modulation PWM output.
By HFBR-1414 fiber optic transmission signal to a control terminal BUCK, third-order RC low-pass filter is reduced to a sawtooth signal into the TL494 comparison.
Resulting in a full-bridge BUS change ramp waveform.
-
Thus completing the BUS modulation QCWDRSSTC tongue
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rabbit
Sun Jul 24 2016, 08:40AM
rabbit Registered Member #58835 Joined: Mon Apr 04 2016, 12:06PM
Location:
Posts: 3
The effect can be , but why STEVE WARD circuit diagram added some useless part。。。
Also too full bridge materials
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Mr.Black
Sun Jul 24 2016, 10:25AM
Mr.Black Registered Member #3960 Joined: Mon Jun 20 2011, 06:27AM
Location: Wuhan Hubei China
Posts: 33
rabbit wrote ...

The effect can be , but why STEVE WARD circuit diagram added some useless part。。。
Also too full bridge materials
Oh, I think I have to explain.
QCWDRSSTC running, Ontime very long. FDD8424 powered only by 2200uF filter capacitor supply.
In a short period of time, for example: 10mS, LM7824 can quickly filter capacitor to charge.
Since the GDT will consume power, so the filter capacitor is likely to decline to IGBT linear amplification area. Example 10V.
Indeed C-E of IGBT gate drive voltage and voltage drop are related, the driving voltage is too low will result in abnormal heat or fail, so the threshold is set at 18V.
Role LM311 circuit part is that when 24V bus dropped to about 18V, off interrupt signal.
Thus ensuring the drive circuit does not generate an exception.
On the other hand, the DRSSTC operation in the event of abnormal power failure, UD2.8 by 220V AC mains supply, this circuit can be quickly cut off the output GDT within a very short period of time after the power failure, rather than GDT output voltage slowly decreased from 24V to 0. BUS in parallel because the large capacitance, it may kill the IGBT. wink
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rabbit
Sun Jul 24 2016, 11:01AM
rabbit Registered Member #58835 Joined: Mon Apr 04 2016, 12:06PM
Location:
Posts: 3
If this part of the circuit to play a role, then it shows that your power supply is not enough to drive enough power to drive IGBT. In this case, even if there is this part of the circuit, but also can not solve the problem, only to prevent the problem of your design. If the transformer is powered by a large enough power at the beginning of the design, the drive voltage will not be too low. This part of the circuit or not to play the role of.
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Mr.Black
Sun Jul 24 2016, 12:58PM
Mr.Black Registered Member #3960 Joined: Mon Jun 20 2011, 06:27AM
Location: Wuhan Hubei China
Posts: 33
rabbit wrote ...

If this part of the circuit to play a role, then it shows that your power supply is not enough to drive enough power to drive IGBT. In this case, even if there is this part of the circuit, but also can not solve the problem, only to prevent the problem of your design. If the transformer is powered by a large enough power at the beginning of the design, the drive voltage will not be too low. This part of the circuit or not to play the role of.
IGBT drivers need is a large pulse power.
May need to do is to increase the capacitance, which is a a tradeoff.
I do not think so, increase the power capacity is the best way to solve the problem. .
Another point in ud2.7c UVLO circuit design proved to be effective, you think this is a failure of the design?
A contrary view, I think the UVLO circuit design is a preventive measures.
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rabbit
Sun Jul 24 2016, 05:01PM
rabbit Registered Member #58835 Joined: Mon Apr 04 2016, 12:06PM
Location:
Posts: 3
Perhaps you are right, but I think that if the power supply part of the design is strong enough, the use of this part of the circuit will be very small
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zrg
Mon Jul 25 2016, 01:15PM
zrg Registered Member #4762 Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
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.
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