摘要:
A power drive apparatus is provided. The apparatus includes a first switch having a first plurality of power devices arranged in a back to back configuration within adjacent stacked rows of the first switch. The apparatus includes a second switch having a second plurality of power devices arranged in a back to back configuration within adjacent stacked rows of the second switch. A bus is shared with the first switch and the second switch. The apparatus includes a control drive device coupled to a gate of each power device of the first plurality of power devices and each power device of the second plurality of power devices.
摘要:
We describe a system for controlling very large numbers of power semiconductor switching devices (132) to switch in synchronisation. The devices are high power devices, for example carrying hundreds of amps and/or voltages of the order of kilovolts. In outline the system comprises a coordinating control system (110, 120), which communicates with a plurality of switching device controllers (130) to control the devices into a plurality of states including a fully-off state, a saturated-on state, and at least one intermediate state between the fully-off and saturated-on states, synchronising the devices in the at least one intermediate state during switching.
摘要:
We describe a controller (130) for controlling a power semiconductor switching device (132) into a selected one of a plurality of states, the states including a fully-off state, a saturated-on state, and at least one intermediate state. The switching device controller includes a voltage sense input (142) to sense a voltage on the device; a current sense input (current feedback) to sense a current passing through the device; a negative feedback control circuit (138) coupled to the sense inputs, a control output (136) to provide to the power semiconductor switching device a drive signal with a response dependent on one or more adjustable parameters; and a circuit controller (140) to control the adjustable parameters responsive to state command data, to control the switching device into a selected state, in particular by controlling an effective resistance of the device. Preferred intermediate states include an active low current state and an active low voltage state.
摘要:
A housing (1) for a power semiconductor, providing a compartment (2) for installation of a power semiconductor (3), and comprising a first and a second terminal (4 A, 4B). The terminals (4A, 4B) are for connection of a power semiconductor (3) installed in the compartment, and for leading current to and from the compartment, The housing comprises a contact mechanism (6, 7, 8, 9, 10) for bypassing the compartment, the contact mechanism comprising at least one movable contact (7) arranged for electrically connecting the first and second terminal (4A, 4B), the at least one movable contact (7) being movable between a disconnected first position and a connected second position, in which second position the movable contact (7) connects the terminals (4A, 4B). The contact mechanism further comprising a bypass actuator (8) arranged inside the compartment and provided for transforming a pressure from an exploding semiconductor into motion, the bypass actuator (8) is operatively connected to the movable contact (7) and arranged to move the movable contact (7) from the first to the second position when subjected the pressure of an exploding semiconductor.
摘要:
It is presented a gate control circuit comprising: a main gate unit arranged to supply, via a plurality of main gate unit outputs, a gate signal to respective gates of a plurality of power switches, for controlling a main current; and an auxiliary gate unit comprising an optical power converter for converting incoming optical power to an auxiliary electrical gate signal. The auxiliary gate unit is arranged to, when a failure occurs in one of the plurality of power switches, provide the auxiliary electrical gate signal to respective gates of any of the plurality of power switches still being in operation. A corresponding power module and method are also presented.
摘要:
A method for the dynamic load-balancing of series- and/or parallel-wired power semiconductor circuits (S1...S4) is disclosed. Individual switching signals (iG1, iG2) for the power semiconductor circuits (S1...S4) are generated, whereby a synchronous sampling timepoint (tsj) with system-wide validity is determined independently for each power semiconductor circuit (S1...S4) based on a synchronous event (es) in the whole circuit (1, 4). Error signals between actual values (ai), simultaneously measured at the sampling timepoint (tsj) and given set values (as) of an asynchronous state variable (a(t)) for the power semiconductor circuit (S1...S4), are reduced in the same or subsequent switching cycle. Alternatively, error signals between actual time values (tai) and set time values (tas) are minimised, whereby the set time values (tai) are measured on a global given threshold value ( epsilon a), for an asynchronous state variable (a(t)) for the power semiconductor circuit (S1...S4), being exceeded. Execution examples include: shifting the sampling timepoint (tsj) by a global set time interval ( DELTA t0), set value determination locally or globally, for example by means of averaging actual values (ai, tai), additional balancing of the gradients of asynchronous state variables (a(t)). Absence of a central sampling command, improves switching synchronisation, shortens switching time and reduces dynamic switching losses.
摘要:
A method for voltage balancing series-connected power switching devices (IGBTs) each connected in parallel with a respective diverter having controllable impedance to controllably conduct current diverted from the associated power switching device, the method comprising the step of controlling each diverter to follow a series of at least two successively higher impedance states during an OFF period of the power switching devices. The series of impedance states for each diverter comprises a first impedance and then a second, higher impedance, the first impedance occurring in response to an indication of a start of the OFF period. The first impedance state preferably occurs during a tail current of the power switching device in parallel with the respective diverter and the second or later impedance state during a leakage current of that power switching device.
摘要:
A circuit breaker and method of controlling Direct Current is disclosed. The circuit breaker has a primary conduction path comprising a positive temperature coefficient (PTC) device with a positive temperature coefficient of resistance and a mechanical switch is connected in series with the PTC device. There is a secondary conduction path with a semiconductor switch arranged in parallel with the PTC device. The PTC device is arranged to commutate current to the secondary conduction path in response to an increase in current through the primary conduction path. The semiconductor switch device is controllable to break current flow through the secondary conduction path.