Title :
Research on large power computer controlled constant current power source technologies
Author :
Yinggang, Zhou ; Xue, Jiang ; Yangen, Xie
Author_Institution :
Inf. Coll., Shenyang Univ. of Technol., Shenyang, China
Abstract :
At present, the technology of the small current, low-power and high stability constant current source is more mature. However the technology of high current, high power and high stability computer controlled constant current power source is still in the exploratory stage. After studying the principles of the constant current source and the internal working principle about switching power supply chip L4970, this paper has designed a program of computer controlled constant current source based on the L4970A. The system consists of two parts, the constant current source module as well as the single-chip computer interface control module. The specific working principle and key circuits of the two parts were introduced in detail. After a long test, the constant current can output 0-10 A current by the computer-controlled, the accuracy of control is within 2 mA, the range of load voltage is 5.1-40 V and the efficiency of main loop conversion is up to 92.5%. The constant current source diode has been successfully applied to the heating power of test equipment, which is proved to be stable and reliable.
Keywords :
constant current sources; electronic engineering computing; microcontrollers; power supply circuits; switching circuits; L4970 chip; MCU; computer controlled constant current power source; constant current source diode; constant current source module; current 0 A to 10 A; high stability constant current power source; microcontrol unit; single-chip computer interface control module; switching power supply chip; test equipment; voltage 5.1 V to 40 V; Communication system control; Control systems; Diodes; Feedback circuits; Power supplies; Pulse width modulation; Resistors; Sampling methods; Stability; Voltage control; 485 Communication; Computer Controlled; Constant Current Power Source; L4970; STC MCU;
Conference_Titel :
Electronic Measurement & Instruments, 2009. ICEMI '09. 9th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-3863-1
Electronic_ISBN :
978-1-4244-3864-8
DOI :
10.1109/ICEMI.2009.5274502