Organize and Share your Electronics the way you want. Sign-Up for a free account now. It takes only 30 seconds!

A DC DC Converter for 28 Volt SMA-Relay

A DC DC Converter for 28 Volt SMA-Relay

Although there already exist many websites about such stuff, another simple DC-DC converter is described here. The output voltage equals twice the input voltage minus the voltage drop across the diodes.
Capacitors: 10 uF/25V, Diodes: 1N4148 (or any other general purpose diode). The IC is an ICL7662 which is rated to have a maximum output voltage of 38.6 V at 20 V input. The ICL7660A may also be used but can take only 13.5 V input voltage.

The plot shows the switch-on behaviour. When 13.8 Volt is applied (upper, grey trace) it takes about 2 ms until the output reaches 24 Volt (green trace).

I use this DC-DC converter on several SMA relais since about 2 years now, none has failed so far. As a test, I put one converter on a 10 Hz square wave generator and let it switch a 24 V relais on/off a whole week (abt 6 million cycles). It survived this treatment as well.

Visit Here for more.

 

More Articles to Read

App note: Testing inductors at application frequencies
App note: Testing inductors at application frequencies
1968 Princeton Reverb Repairs
1968 Princeton Reverb Repairs
Skill Sunday: Power Over Ethernet for Arduino
Skill Sunday: Power Over Ethernet for Arduino
More on Color TFT Displays ~ The Big Ones — 240 X 320
More on Color TFT Displays ~ The Big Ones — 240 X 320
Magnetic Rotary Encoder
Magnetic Rotary Encoder
Vertical Pole Climbing Robot
Vertical Pole Climbing Robot
ESP8266 Weather Station Projects
ESP8266 Weather Station Projects
Single tube Lethal Nixie clock
Single tube Lethal Nixie clock
How to make a simple 1 watt audio amplifier (LM386 based)
How to make a simple 1 watt audio amplifier (LM386 based)
Flashing Binaries to DRA7xx Factory Boards Using Device Firmware Upgrade
Flashing Binaries to DRA7xx Factory Boards Using Device Firmware Upgrade

Top




Shares