DC-DC converter with active return flow lockout and method for operating DC-DC converter

• Main Authors: KOVATCHEV EMIL, STOEGER CHRISTIAN
• Format: Patent
• Language: Chinese; English
• Published: 24.04.2018
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The disclosure relates to a DC-DC converter (10) in which a first coil terminal (11') is connected with an input terminal (11) and a second coil terminal (12') is connected, on the one hand, via a rectification switch (22) to an output terminal (12) and, on the other hand, via a control switch (23) to a ground potential (17) and a control circuit (29) is configured to switch in successive switching cycles in each case in a regulating phase (39) the rectification switch (22) to be electrically blocking and the control switch (23) to be electrically conducting, and in a rectifying phase (40) toswitch the control switch (23) to be electrically blocking. A measuring component (26) generates a measurement signal (35) which signals a current intensity of a coil current (24), and a comparator circuit (43) compares the measurement signal (35) with a threshold value (S2) and the control circuit (29) keeps the rectification switch (22) electrically blocking in the rectifying phase (40) and conducts the coil current (24