Electronics Projects, ATmega16 Digital Laboratory power supply IR2153 SMPS LT3081 L4970 article
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0-30V 0-6A Adjustable Laboratory power supply LCD Display ATmega16 controlled The basic involvement of the entire laboratory resources. Ac mains voltage 230V is transformed into two equal dc voltage 35V and also on the two voltage with a value of 5V for various polaritách. To a voltage of 35V is connected part of the Active cooling. All these strains lead to Regulatory blocks 1 and 2. You have the task to stabilize the input voltage and vary its size depending on the set value of the output voltage. They also contain the function of restricting the output current. Both of these electrical variables are set by using part of the Digital management.
Power branch with a voltage of 35 V In this branch of the Network part of the source will be transmitted power to achieve values up to 490W, and therefore he was elected a switching power source type in the involvement of polomost (see. chapter 1.2.9). The switching of the power transistors is controlled by a smps circuit IR2153
This simple smps circuit can switch the power transistors connected to the inputs of the HI and LO when the voltage of 600v. But thanks to a stabilizing diode connected to pin VCC voltage of 15.6 V. Pins RT and CT is used for connection of external RC article, which with the internal circuitry of the IR2153
The task of the regulatory block is the stabilization and regulation of voltage and current. In order to achieve high efficiency, but at the same time and the speed of reaction to the change in the connected load, is the control block consists of two parts – switching and linear. The core of the switching section is an integrated circuit L4970 and the linear part of the circuit of the LT3081.
IR2153 Smps Circuit Laboratory power supply
The main control circuit is a 8 bit microcontroller ATmega16 from Atmel. In his holster conceals processor, 16 kB Flash, 1 kB SRAM, 512 B of EEPROM, four 8-bit ports, one 16 and two 8-bit counters, analog comparator, eight 10-bit a/D converters and other peripherals
digital lab power supply circuit pcb schematic all files alternative links: atmega16-digital-laboratory-power-supply-ir2153-smps-lt3081-l4970.rar alternative link2