how can i get the higher voltage than power_supply ?

[qqmz]

now ,the power_supply is 3v in my circuit ,how can i get the 5v or 7.5v voltage , if i need to use a charge pump or other circuit structure? i do not have the experience related to this , expecting your advices!!!


thanks first!!!

 

[IanP]

Depending on current that you will require at the higher voltage level, you can use a charge pump such as for example: **broken link removed**
or you can build an inverter such as: http://www.aaroncake.net/circuits/6-12conv.htm (some values need to be changed in order to operate correctly of 3V)
Regards,
IanP

 

[Yun Lin]

Yes, the charge pump design can meet your requirement. And the current consumption is most important spec for the charge pump.

 

[carrier]

in the simplest way, you can build an oscilator such as 555 and drive a little transformer such as impulse choke core and with ratio of turn deliver the desire voltage at output.
if you still havea problem reply to upload circuit.

 

[layes2]

use L and c
and extra device

 

[jodokus]

If you need less than 100mA, use a switched capacitor circuit. They are made by linear technology, analog devices, national and others. For more current, you will need a switching regulator with a coil or transformer. Look at the same manufacturers for this.

 

[qqmz]

thanks for all your helps !!!

 

[jupally_kiran]

better prefer the other options than the charge pumps becoz designing of the charge pump at time is a bit difficult

 

[tsanlee]

You can think about these item

Charge Pump:
Low Nosie , light load ,Small Area

Boost PWM/PFM
Heavy Load ,Fast Load Transient (need inductor)

 

[bamdad]

Maybe some DC-DC converters which are available as black boxes suite the need.