3.6 V DC input 45 V AC output with 100mA (current Pulse) ?

[shahidmehboob]

Hello,
Can anyone help me how to do this circuit which Components i can use?
Which kind of transformer I need or if i need to use Boost converter?
INPUT: 3.6 V DC
OUTPUT: 45 V AC with 100mA (current Pulse) ?


THanks everyone

 

[rahdirs]

Hello,
OUTPUT: 45 V AC with 100mA (current Pulse) ?

Is o/p 45 V AC a typo ????
Then don't you need to use an inverter to change DC to AC

 

[shahidmehboob]

Is o/p 45 V AC a typo ????
Then don't you need to use an inverter to change DC to AC

lets say its DC so we need to use DC DC converter. but one problem is if we use 555 to generate current pulse of our desired frequency vlotage drops up to 1. 2 or 1.8 volts.
if i use 3.7V battery and generate a pulse of 2khz and use Dc Dc converter i think i can get the desired result but the problem how to generate pulse with out loses?

Thanks

 

[rahdirs]

where are you getting the voltage drop,can u post the schematic or at least blue-print of what you're trying to do ??

 

[tpetar]

lets say its DC so we need to use DC DC converter. but one problem is if we use 555 to generate current pulse of our desired frequency vlotage drops up to 1. 2 or 1.8 volts.
if i use 3.7V battery and generate a pulse of 2khz and use Dc Dc converter i think i can get the desired result but the problem how to generate pulse with out loses?

Thanks

2KHz is too low, you need much higher frequency 100KHz, 500KHz, 700KHz,....



See MC34063 solution:

Here is link to calculator:
**broken link removed**



In this configuration you must use external switching transistor!
Ipk (current peak) is higher then 1,5A.

If you have big voltage drop on load, then you use small battery for that job. Use higher capacity battery or newer. Phone Li-Po batteries are great for manz projects, they are cheap and reliable, almost always on declared capacity (original batteries, not chinese battery products from street).



Also search other products of other manufacturers with higher efficiency, usually products on 500KHz and higher. Start from Microchip and TI ICs.


MCP1650
**broken link removed**

Output Power Capability Over 5 Watts
560/440 Output Current (mA)
Output Voltage Capability From 3.3V to Over 100V
750 kHz Gated Oscillator Switching Frequency
Adaptable Duty Cycle for Battery or Wide-Input, Voltage-Range Applications
Input Voltage Range: 2.0V to 5.5V
Capable of SEPIC® and Flyback Topologies
Shutdown Control with IQ < 0.1 µA (Typical)
Low Operating Quiescent Current: IQ = 120 µA
Voltage Feedback Tolerance (0.6%, Typical)
Popular MSOP-8 Package
Peak Current Limit Feature
Two Undervoltage Lockout (UVLO) Options: 2.0V or 2.55V
Operating Temperature Range: -40°C to +125°C

Microchip AN980 - Designing a Boost-Switching Regulator with the MCP1650
http://ww1.microchip.com/downloads/en/appnotes/00980a.pdf


MCP1653
**broken link removed**




Best regards,
Peter

:wink:

 

[shahidmehboob]

Thanx Peter for your brief answer. I really appreciate it.

I need current pulse maximum 2khz and less then 2Khz. later i will control the frequency and intensity of current. So output i desire is a pulse with not more then 100mA on 500ohm load at 2khz maximum. thats why i wanted to use 555 timer ic but there is a loss in switching of around 1.8v. should i use directly two transistors for this purpose? how it will work like i know how to connect but it wasnt working i was trying in proteous.
voltage should be step up after a pulse or before a pulse? is there anyway that i could step up and control frequency using one ic by switching between the resistors?

Thanx for help


Shahid

 

[tpetar]

Hi Shahid,

This is not simple job, 2KHz is too slow. Use suggested or similar IC from my previous post. Design should be efficient or battery will get hard job.



Best regards,
Peter

;-)

 

[shahidmehboob]

Peter,
Is it possible if i use two transistors for switching. It will give me 2Khz easily right. Then i give this 2Khz to step up converter to get high voltage and low current with the same frequency?

Or is it more suitable to use transformer and use AC output?

Thanx...

Best regards

Shahid