Buck-boost power led driver using pic microcontroller

I decided to demonstrate one solution that might be basic electronics for some, but still many dont know about. Bonus is also that dedicated switcher controller ics typically have a builtin mosfet or a builtin gate driver, able. The ideal waveforms of a twoswitch buckboost converter operating in buckboost mode and ccm are shown in figure 3. Buck converter using pic microcontroller and ir2110, in this article you will learn everything you need to design a buck converter. The default constant current output mode is buckboost, but with a simple change in wiring this driver can run in boostonly mode as well. The switching power supply design ensures efficient power transfer between the system battery and the. Pdf cuk converter as a led lamp driver researchgate. This project is designed and simulated and a prototype is.

The application, as shown, can be connected to operate as a buckboost converter or a boost converter. One traditional lowcost way of driving led in electrical applications uses a resistor in series with the led device. Analog devices stepup boost led drivers provide current control of multiple leds and support for high brightness led lighting, large format led backlighting, cameraenabled smart devices, and a range of related applications. Pic16f877a microcontroller is used to generate pulse width modulation using pic microcontroller. In a microcontroller based solution, you have the flexibility of using the same hardware for charging different batteries and making only slight changes in the software.

Reason fo use or not use a microcontroller to drive a buck. The circuit is based on a buck topology switching power supply using the onchip comparator peripheral within the pic12f675 pic r microcontroller buck boost led driver using the pic16f785 mcu this application note presents the design equations, schematics and source code for a 5. Also, the developers can design smaller solutions using less pcb area and achieve lower bill of material costs. As its name implies, it is a direct path to the led, just like old incandescent flashlights. Analog devices buckboost led drivers allow led bias when the input voltage is either above or below the led voltage. Buckboost mode can supply output voltage lower and higher than the input voltage. Design and implementation of dc to dc buckboost converter. Pdf design and implementation of a microcontroller based. An1047 buckboost led driver using the pic16f785 mcu 326kb. This proof of concept design is a solar dcdc buckboost power supply for battery charging and led drive. Which i have done and will show you at the end of this instructable.

Basically in dc to dc buck boost converter system, fly back smps is used to for power supply at certain frequency to supply voltage to control circuitry and driver circuitry respectively. Buckboost power led driver using pic microcontroller by ab rahman mohd taufik get pdf 3 mb. The onchip op amp of pic16f785 is used to amplify the voltage across the current sensing resistor. Buckboost power led driver using pic microcontroller core. Microcontroller based mppt buckboost converter using 555.

Wall mount 12w phihong 12v output 24w phihong 12v output 36w mean well 12v output desktop 1890w mean well gst series 120w phihong 12v output enclosed or caged 35350w mean well lrs series. Buck converter using pic microcontroller and ir2110. Nothing compared to say a 20w incandescent which will dissipate 1519w, but still quite a lot. Circuit diagram of buck boost converter is shown below. The pic16f785 makes a great choice for this application because it combines a mcu with many onchip analog peripherals. In this project, i will be designing a power led driver using pic microcontroller and also buckboost converter. Searching using led driver 2a gives better results. A simplified schematic of a buckboost converter is shown in figure 2. The demand of solar energy has increased rapidly in this decade. Microcontroller based mppt buckboost converter using 555 timer. Automotive aecq100 qualified constantcurrent led drive 50 v supply 53.

Buckboost buckboost click on the link below to see our highly integrated solutions optimized for nonisolated offline power supplies. I bought a 4 led panel from a surplus store that runs on 6 volts 0. A simple method that can be used to drive an led is to install a resistor in, variablecurrent dimming is not the most efficient way to set the led brightness level. A long time ago i promised i would do a topic to explain to the interested layman the difference between linear, buck, boost and direct drive drivers. The pic16f785 makes a great choice for this application because it combines a mcu with many on. Buckboost power led driver using pic microcontroller mohd taufik, ab rahman 2008 buckboost power led driver using pic microcontroller. Battery charger including ferroelectric, 4v, 6v, 12v, 14v, 24v battery charging, nickelcadmium nickelmetal hydride batteries battery charger, solar panels, wind generators. Microcontroller based bidirectional buckboost converter. Boost buck voltage lm2577s lm2596s dcdc step up down. Diodes d 1 andd 2 are the antiparallel body diodes of power. The pic microcontroller is used as a main controller for providing constant current to the led. Design and implementation of a microcontroller based buck boost converter as a smooth starter for permanent magnet motor.

This is ideal in cases such as a single cell lithiumion liion battery driving a single led where the input voltage can vary from 4. Sometimes there is a control chip and transistor to create modes high, low. The driver i designed is a buck converter only, as buck boost are more difficult to design. Power supplies allow you to power your led and driver from a wall outlet or other source. The led driver circuit using buckboost converters drives the cathode terminal of led strings to illuminate leds. In control circuit pic 16f877a controller is used and programming of this controller is done. Every now and then someone asks on different forums if there is an way to control cheap lm2596 modules with an arduino or another microcontroller. The buckboost converter is especially useful for battery applications. Mohd taufik, ab rahman 2008 buckboost power led driver using pic microcontroller.

Singlestage, high power factor led drivercontroller with. I am using a cree xml led datasheet here, its the 240lm neutral white model, part number. It seems to me that the buckboost topology with an lnk409eg or lnk419eg is the most simple and economical. This is due to the low forward voltage drop which leads to higher efficiency. The reason for me to design such a driver is to provide an efficient solution to the old method using a resistor in series to limit the current through the power led because by. The luxdrive a011 series flexblock is a dualmode boosting led power solution for driving highbrightness leds. Buckboost power led driver using pic microcontroller. Boost current regulators for led stmicroelectronics. Analysis of the proposed bidirectional buckboost converter 2.

If i were to design around a buckboost topology, id probably use a dedicated led controller ic. Basic calculation of an inverting buckboost power stage. The output voltage v o m of the traditional buckboost converter is given by 1 v o m. Although this driving scheme is simple and inexpensive, it suffers several disadvantages. In the existing system dcdc buck converter 1011 is used as a smooth starter for a dc permanent magnet motor 1. Members of this portfolio include i2ccompatible programming interfaces, with compact, high efficiency features suited to.

Find the right led drivers and led driver ics from maxim integrated portfolio of led driver products covering the full range of efficient switchmode topologies stepdown, stepup, sepic as well as some linear led drivers. How to design an efficient noninverting buckboost converter. Electronics projects, microchip led lighting applications design guide led projects, microchip projects, microcontroller projects, microchip produced by pic microcontrollers, led drivers, led control ics prepared for the sample application, designer notes. Buckboost led drivers rohm offers a broad lineup of led drivers, such as acdc, dcac, and constant current types optimized for a variety of applications, including lighting, backlighting, camera flash, displays, and automotive systems. Reason fo use or not use a microcontroller to drive a buck dcdc regulated converter. An1066 xx miwi wireless networking protocol stack 604kb. Stephen bowling microchip, microchip technology inc. The buckboost converter the buckboost converter is used when the supply voltage may be above or below the required output voltage.

Boost current regulators for led 10 buck current regulators for led 21 flash led supply 1 led array drivers 26 led matrix drivers 4 linear current regulators 6 offline led drivers 11 hvled 7 lighting ics 9 ballast control ics for fluorescent lamps 5 digital power control drivers 4 linear voltage regulators 87. The buckboost topology is also known as a flyback or inverting regulator. Im currently looking to design a driver for a single highpower led that can be brightness controlled and turned onoff via a pc. An1229 class b safety software library for pic mcus and dspic dscs. The circuit diagram of the proposed bidirectional converter bdc is given in fig. This confirms that the twoswitch buckboost converter performs a noninverting conversion. Pic16f1509 solar powered led security lamp proof of. Understanding the difference between linear, buck, boost. This application note presents the design equations, schematics and source code for a 5.

Design and implementation of a microcontroller based. The design consists of 3 primary functions controlled by the pic16f1509. Browse other questions tagged microcontroller pic led pwm driver or ask your own question. Analysis of an led lighting circuit using a hybrid buck. An1047 buckboost led driver using the pic16f785 mcu author. However, efficiency suffers at higher output voltage, so boost mode should be used when you need higher output voltage than input.