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# Is it possible to boost 12 V to 1000 V? The 12 V input is coming from a battery.

I have an application where in I require 1000 V DC from a 12 V battery. Is there any fly back or multistage boost converter available to achieve this?

• Hi Getssy,

Thanks for reaching out with your question.

What is the output current of the 1000V rail? And is isolation required in the design?

Thanks,

Garrett
• In reply to Garrett Roecker:

Dear Garrett,

Thank you for your kind reply. Isolation is not mandatory requirement for the circuit. Its a low current application ( if possible a maximum of 1 A or so, if not mA should also be fine).
• In reply to Getssy prathiba:

Hi Getssy,

Before we can come up with a solution the output current needs to be defined. If the output current is 1A then this will be a difficult design.

Thanks,

Garrett
• In reply to Garrett Roecker:

Dear Garrett,

Could you please let me know what can be the maximum current possible with a standard design?

Best Regards,
Getssy

• In reply to Getssy prathiba:

Hi Getssy,

Assuming the output is 1A the average input current is going to be ~83A. To find reasonably sized components this would need to be a multi-phase design. Possibly 3 phases would work.

Can you please tell me what the application is? This is not a common application specification.

Thanks

Garrett
• In reply to Getssy prathiba:

Hello Getssy,

With such a high boost ratio there are typically several stages used.
Boost + charge pumps, flyback with stacked windings, multipled SEPIC, are some of the topologies used.
Output currents  for a high boost ratio are usually in the 10's of mA range, or lower.

Please see http://www.ti.com/tool/PMP30104  as an example.
A SEPIC converter is used to charge a load capacitor (up to 15000uF) up to 400V/420V (selectable).
The input voltage range is 15V +/-10% and the constant output charging current 80mA.
The multiplied SEPIC topology has several advantages compared to Boost + charge pump mainly thanks to reduce peak and RMS currents in the multiplier of the SEPIC.

http://www.ti.com/tool/PMP20212
This low current boost converter implements a voltage doubler which allows a high input-to-output boost ratio.
This design is low cost and requires an area of 16mm x 27mm.
More stages of voltage doubler can be added to increase Vout.

http://www.ti.com/tool/PMP20183
This boost converter implements a voltage tripler which allows a high input-to-output boost ratio.
The design is low cost and requires an area of less than 25mm x 25mm.

Finally, this PMP design is not public yet, however I will forward the details.
PMP20899 is a 6-8.4Vin and makes 1500Vout at 20mA.
It is a stacked flyback approach.
Schematic, BoM, Test Report are attached.

There is not an example of 12V to 1000V in our archives, however the 4 examples above show the possibilities.

Best Regards,

Ed Walker
Texas Instruments
Online Support - Systems & Tools

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