Design of controllable current source, which will be used to control the brightness of the power LEDs. It is intended to use fifteen PWM outputs from Arduino for management of fifteen resources. This application will be used to calibrate...Electronics Projects, TPS92513 TL494 Power Led Driver Circuit "arduino projects, tl494 circuit, " Date 2019/08/08
Design of controllable current source, which will be used to control the brightness of the power LEDs. It is intended to use fifteen PWM outputs from Arduino for management of fifteen resources. This application will be used to calibrate the camera.
That’s why it is minimum ripple current through the LEDs is required. At the beginning of this work will be described Arduino and graphical environment Delphi 7. Using the application it will set the required values on the Arduino PWM outputs. Arduino is an electronic platform based on simple hardware and software and its communication with Microsoft Delphi application is described here.
Next, switching and linear current sources and their properties will be described. Current sources are sources that maintain a constant current. To control the current of the LEDs are predominantly They use LED drivers, so one concept is designed with an integrated switching power supply or LED driver TPS92513.
The aim of this work is to design and implement several concepts of controllable current sources with the least current ripple, comparison and selection of the most suitable circuit. Part of the work will be the basis for making these circuits, ie wiring diagrams and drawings printed circuit board. The proposed source will be used to control the brightness of diodes with different VA characteristics, therefore a switchable divider will be placed on the control input of each circuit to provide limitations current of 250 mA, 150 mA and 50 mA.
Schematic TL494 Power Led Driver Circuit
Schematic TPS92513 Power Led Driver Circuit
Lower ranges are used for larger ones distinction. The Arduino analog outputs have an eight-byte resolution, which is why we use it range 0 – 50 mA, where it is possible to adjust the current in steps of 0.2 mA. It is in the range of 0 – 250 mA step 1 mA. For comparison, a current source operating in linear mode, a current source operating will be proposed in switching mode and a switching power supply based on the above mentioned LED driver. All these circuits will be measured in all ranges and evaluated.