公开(公告)号：EP1186093A1

公开(公告)日：2002-03-13

申请号：EP00929016.4

申请日：2000-05-17

Applicant: Ascom Energy Systems AG

Inventor： KOLAR, Johann, W. ,  KORB, Wilhelm

IPC: H02M7/217

CPC classification number: H02M7/125 ,  H02M7/217

Abstract: The invention relates to a device for precharging the output capacitors in a three-phase three-level pulse rectifier system. According to the invention, a thyristor (18) is arranged in each phase between the input terminal (8) in the direction of flow, whereby said thyristor is connected to the anode of the free-wheeling diode (15) and a precharging branch (2) is connected parallel thereto. The circuit (3) which is used to control the thyristor (18) is activated when pre-charging is terminated; the reference voltage (30) is applied to the negative input (35) of the comparator (28). When an increase occurs in the potential profile which is present at the pick-off of the voltage divider (36) at the input (8) of the branch of the bridge, the voltage at the positive input (37) of the comparator is greater than the reference voltage (37) shortly before the line voltage (12) crosses zero and enters into positive values, whereby said increase triggers a changeover in the comparator output (29) or control of the thyristor (18), whereby control of the thyristor (18) is terminated once more when the average input potential of the branch of the bridge crosses 0.The thyristor (18) is thus ignited solely inside the half-wave of the line voltage during which it is required to for guidance.

公开(公告)号：EP1186093B1

公开(公告)日：2003-05-02

申请号：EP00929016.4

申请日：2000-05-17

Applicant: Ascom Energy Systems AG

Inventor： KOLAR, Johann, W. ,  KORB, Wilhelm

IPC: H02M7/217

CPC classification number: H02M7/125 ,  H02M7/217

Abstract: The invention relates to a device for precharging the output capacitors in a three-phase three-level pulse rectifier system. According to the invention, a thyristor (18) is arranged in each phase between the input terminal (8) in the direction of flow, whereby said thyristor is connected to the anode of the free-wheeling diode (15) and a precharging branch (2) is connected parallel thereto. The circuit (3) which is used to control the thyristor (18) is activated when pre-charging is terminated; the reference voltage (30) is applied to the negative input (35) of the comparator (28). When an increase occurs in the potential profile which is present at the pick-off of the voltage divider (36) at the input (8) of the branch of the bridge, the voltage at the positive input (37) of the comparator is greater than the reference voltage (37) shortly before the line voltage (12) crosses zero and enters into positive values, whereby said increase triggers a changeover in the comparator output (29) or control of the thyristor (18), whereby control of the thyristor (18) is terminated once more when the average input potential of the branch of the bridge crosses 0.The thyristor (18) is thus ignited solely inside the half-wave of the line voltage during which it is required to for guidance.

公开(公告)号：EP0958647B1

公开(公告)日：2001-07-18

申请号：EP98909431.3

申请日：1998-02-10

Applicant: Ascom Energy Systems AG

Inventor： KOLAR, Johann, W.

IPC: H02M1/12 ,  H02M7/217

CPC classification number: H02M1/4216 ,  Y02B70/126

Abstract: A device for transforming a three-phase voltage system (7) into a freely predeterminable, potential-independent direct voltage (8) has a primary circuit (2) and a secondary circuit (4). An inductance (9, 10, 11) at an input (15, 16, 17) of an associated bi-directional, bipolar electronic switch (18, 19, 20) is connected upstream of each phase of the primary circuit. The second inputs (21, 22, 23) of the switches are directly interconnected. A positive primary voltage bar (41) is supplied via diodes (38, 39, 40) and a negative primary voltage bar (45) is supplied via diodes (42, 43, 44). One end (24) of the primary winding (25) of a transformer (3) is connected to the line which interconnects the inputs (21, 22, 23) of the switches (18, 19, 20), and a power transistor (47) with an antiparallel diode (48) the collector or drain side of which lies at the positive primary voltage bar (41) is connected to the second clamp (46) of the primary winding (25). Another power transistor with an antiparallel diode (50) whose emitter or source side is connected to the negative primary voltage bar (45) branches off from the end (46) of the winding. The secondary winding (51) of the transformer (3) is designed at the input clamps (52, 53) of a monophase diode bridge (54) with a capacity (57) that smoothes the output voltage (8) arranged between the output clamps (55, 56), i.e. as a full bridge circuit.

公开(公告)号：EP1245074A1

公开(公告)日：2002-10-02

申请号：EP01900011.6

申请日：2001-01-05

Applicant: Ascom Energy Systems AG

Inventor： KOLAR, Johann, W.

IPC: H02M7/217 ,  H02M1/12

CPC classification number: H02M7/2173 ,  H02M2001/007

Abstract: The invention relates to a device (1) for converting a three-phase voltage system (20) into a constant voltage and is supported by an output condenser (5), having an output side star circuit (2) of filter condensers, a controllable alternating current bridge (3) and a bridge circuit (3) having a positive output, provided with a current shaping inductivity (4) connected to a step-up-converter diode (7) and a step-up-converter transistor (6). A constant voltage-constant voltage step-up-converter diode is integrated into the converter structure. The phase branches (8), (9), (10) of the bridge circuit (3) have identical structures and can be controlled in the conducting state by control circuits (12). Post filtration of switch frequency spectral components in a sinus-shaped procedure pertaining to the network current occurs resulting in distribution of the output inductivity (4) current to shaped phases or a pulse width modulation of the voltage at the input clamps (13), (14), (15) in order to generate a constant voltage via the output condenser (5) is executed. A constant voltage is achieved via the output condenser (5). In order to generate a system (19) output voltage which lies below the mean value of the maximal output voltage of the bridge circuit (3), the step-up-converter transistor (6) remains in a blocked state. The formation of a maximum achievable output voltage value occurs at full level control of the alternating current bridge (3) via a corresponding touch relationship of the step-up-converter transistor (6).