AUTOMATIC GENERATOR OF SIGNAL FOR INITIAL SETTING OF MICROPROCESSOR CONTROL SYSTEM OF CONVERTER Russian patent published in 1998 - IPC

FIELD: digital control systems for uninterruptable power supply and for electric supply lines which redundant sources are power supplies with wide dynamic range of output voltage. SUBSTANCE: device is designed as standard microprocessor control system where microprocessor is set to initial state by RESET signal and peripheral devices are controlled by microprocessor signals which are transmitted through data and address buses. Goal of invention is achieved by introduced comparator, two voltage dividers, controlled gate, NAND gates and 2-AND-NOT gates. Input of comparator is connected to difference between required voltage and part of non-stabilized power supply. Output signal of comparator controls gate which is connected in parallel to capacitor of serial RC circuit which is connected to stabilized power supply which outputs signal to input of NAND gate which generated high level RESET signal. Low level RESET signal is generated by second NAND gate which input receives signal from output of first NAND gate. RESET signal and one signal from output of NAND gate at output of selector of peripheral devices are sent to first 2-AND-NOT gate. RESET signal and one signal from NAND gate at output of microprocessor for control of peripheral devices are sent to second 2-AND-NOT gate. Signals from 2-AND-NOT gates are sent to corresponding chips of peripheral devices. EFFECT: increased reliability of digital control system in voltage drop and recovery modes. 2 dwg