If you can't put one large cap in then perhaps a bunch of smaller ones?

Look at inductors for your power storage, they seem to be "denser" in 
terms of joules per cubic centimeter (and heavier, but thats not your 
problem :->)

Given the racket a typical hair dryer makes i doubt a 50/60hz hum would 
be noticed in a DC motor drive.


Mauricio Jancic wrote:
> The volume is high, aprox. 30K units/month. 
> The application is a hairdryer, and space is critical. They can't even put a
> 35x45 capacitor we were considering.
>
> The LV supply is relatively easy to solve. The problem is the HV supply with
> the high current requirements and the required ripple. What I'm trying to
> avoid somehow is the large capacitor.
>
> Regards,
>
>   
>> -----Original Message-----
>> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
>> Behalf Of Apptech
>> Sent: Thursday, January 31, 2008 01:50
>> To: Microcontroller discussion list - Public.
>> Subject: Re: [EE] Cheap power supply
>>
>>     
>>>  I'm trying to find a solution for a power supply. It will
>>> supply power to
>>> an appliance, so it should be as inexpensive as possible.
>>> It will also have
>>> to be as small as possible since the design department
>>> says I have no more
>>> room to play with :)
>>>
>>>  The requirements are:
>>>
>>> Vout1: 100Vdc 3A continuous and 10A peak (<5sec) to drive
>>> a DC motor
>>> (unregulated)
>>>
>>> Vout2: 12~15V 15mA continuous to drive some mosfets
>>>
>>> Vout3: 5V 15mA for a PIC
>>>
>>>
>>> Ideally, it will be for 100~240 Vac input voltage,
>>> preferably but not
>>> mandatory with automatic voltage selection.
>>>
>>> A transformer is not viable, since there is no room for
>>> it.
>>>       
>> You MUST say what sort of voolume you have available.
>>
>> Who says that there is no room for a transformer.
>>
>> The LV supplies require about 300 mW of power - extremely
>> small.
>>
>> Is the HV supply acceptable as is?
>>
>> Why not use an eg TO92 sized or surface mount voltage
>> regulator?
>>
>>
>>         Russell
>>
>>
>>
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>>     
>
>   

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