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About andre_teprom

Basic Information

Date of Birth
June 24, 1968 (50)
Areas of Interest
Area of specialization:
Digital Signal Processing, Microcontrollers, Power Electronics, PCB Routing / Layout / SImulation
Optional Info
Biography:
Electronic engineer
Graduated at UFRJ (Brazil) on 1997
Location:
Brazil
Interests:
Woman, Money, Power
Occupation:
Sleep

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Recent Entries

Routine for handling 7-seg display on CCS

by andre_teprom on 17th October 2018 at 20:11
The following function may be useful for those who are starting in the microcontroller's world and wish to implement applications using 7-segment display with the CCS compiler in PIC platform. I've used long time ago:

Code:
void Display7seg ( char value )
   {
   char pin=0 ;
   while ( pin< 8 ) 
       {
       if ( SEGMENTCHARS[value ] & ( FIRST_SEGMENT >> pin) ) 
         output_high ( DISPLAY_PINS[pin] ) ;
       else

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Estimating the cost required to resize a 60Hz transformer to comply with 50Hz

by andre_teprom on 7th February 2015 at 16:40
It is a common concern of technicians to adapt equipment manufactured on countries whose frequency of electric public mains differs from its local, so that a modification becomes necessary, but depending on the size of equipment, the cost of the transformer may be the largest when compared to the other devices, and the following study can help determine the feasibility of conducting such a change. Obviously, this also determine if the power sizing is adequate to the load consumption.

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Sizing transformers for AC voltage stabilizers employing series topology

by andre_teprom on 25th June 2014 at 21:58
This article is intended to be a quick guide on calculation of transformers used in AC voltage stabilizers which employes series topology. Such model is rarely used in low power equipments due to the relatively more complex control system required for drive the switching devices, but is specially suitable for employing at high power equipments, on what the weight of a conventional transformer (multi-taped) would be prohibitive, besides the fact that it reaches better resolution in the output compared

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Power Modules: alternative way for mounting

by andre_teprom on 22nd February 2014 at 14:33
Equipments such as Inverters and Rectifiers employ power modules as IGBTs, MOSFETs and TRIACs based on compact packages (modules). These components are mounted just above heat sink structure, and unlike PCB based packages, offer the possibility for assemble adopting an alternative approach.

Basically consists of replacing each wiring connection for a metal plate (eg copper), and obviously, in order to achieve proper stacking, it is required to use a sheet of insulating material (eg

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C program for rotating bitmap characters ( 90 degree )

by andre_teprom on 9th January 2014 at 01:32
When dealing with displays which haven´t character pattern at desired size, we need to insert character maps in the code program. Once draw entire table is a task somewhat painful, the next step is take a search on the Web for some available map file.

However, after find it and put the map on the code, not rarely we realize that these characters were not drawn in the direction which the panel will be positioned, and we will need to make rotation for +/- 90 degrees, what means:

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