48 results about "Braking chopper" patented technology

The invention relates to a metro traction inversion chopping power unit. The metro traction inversion chopping power unit comprises a radiator, seven IGBT (insulated gate bipolar transistor) devices, seven IGBT configuration plates, four IGBT driver boards, a diode device, six absorption capacitors and composite busbars; According to the invention, a braking chopper circuit and an inverter circuit are centralized to one power unit, and share only one set of heat pipe radiator, so that the occupied area of vehicle space is reduced; the composite busbars are used as main circuit busbars, so that the electric clearances and absorption circuit accessories between the busbars as well as between the busbars and a support framework are reduced, the size of a power unit is reduced, and the reliability is increased; through the adoption of the laminated structure, the IGBT driver board components are all mounted on the outer side of a module, so that the replacing and maintenance are convenient. According to the metro traction inversion chopping power unit, the size of the entire power unit is reduced, the space is saved, and the maintenance efficiency is improved; therefore, the utilization ratio of a subway train is increased, and the operation cost is reduced.

A power failure section can be accurately detected without depending on a loaded state and application of voltage to the overhead power line can be stopped in a short time when a power failure is detected. An electric car controller includes an overhead power line voltage detector (11), a band-pass filter for detecting a ripple component included in the detected overhead power line voltage, a comparator-1 for comparing the level of the detected ripple component with a predetermined reference value Vref1, a rheotome control circuit (16) and a rheotome (3) which judge that a power failure has occurred if the ripple component is judged to be smaller than the reference value Vref1 based on a comparison result obtained by the comparator-1 and disconnect the overhead power line (1) from a VVVF inverter (6), a second comparator-2 for comparing the level of the ripple component with a reference value Vref2 larger than the reference value Vref1, and a brake chopper (8) and a brake chopper control circuit (17) which operate if the ripple component is judged to be smaller than the reference value Vref2 based on the comparison result obtained by the comparator-2 to suppress the increase of the overhead power line voltage.

The invention concerns an installation constituting a railway propulsion chain, characterized in that it comprises, sequentially arranged, in the power electrical circuit, between a power transformer powered by a catenary and an electric motor of said vehicle, said catenary being capable of supplying a plurality of voltages, alternating or direct, said electrical circuit comprising a plurality of contact switches for selecting a given catenary voltage, at least one of the following elements: a controlled rectifier bridge (A1, A2), preferably a single-phase bridge with forced switching; a substantially reactive input filter (A3), preferably comprising at least a capacitance and/or at least an induction coil; a braking chopper capable of including also a clipping function (B); a multiphase and multilevel static converter (C1, C2, C3), preferably three-phase; electronic components, preferably IGBT power semiconductors for each element, each element belonging to at least an elementary power arm of the modular circuit diagram.

A method of controlling a brake chopper and a control arrangement, the brake chopper being connected between the positive and the negative rails of an intermediate voltage circuit feeding an inverter bridge, wherein current measurement means are arranged between a DC voltage source and the brake chopper and adapted to measure DC current flowing in the intermediate voltage circuit, which method comprises steps of forming with the inverter bridge an output voltage to a load connected to the output of the inverter bridge, determining a time instant when the DC current of the intermediate circuit is sampled, and preventing the use of the brake chopper at the determined time instant.

The invention relates to a wind-driven generator set variable-pitch system power grid fluctuation protection method. The method includes the following steps that: a wind power generation control system reads power grid AB line and BC line voltage which is detected by a converter and sends the voltage to a variable-pitch system through CANopen; the variable-pitch system receives the power grid AB line and BC line voltage sent by the wind power generation control system and judges the state of a power grid according to a set line voltage fault threshold value and fault delay time; when the power grid AB line and BC line voltage sent by the converter fails or communication between the variable-pitch system and the wind power generation control system is interrupted, the variable-pitch system detects bus-bar voltage through a driver and calculates energy switched onto a braking resistor in a period when a braking chopper is switched in, and the variable-pitch system indirectly judges the state of the power grid according to the set fault threshold value and fault delay time; if the variable-pitch system detects that the power grid is in abnormal state, a main power source contactor is switched off, so that the variable-pitch system can be disconnected from the power grid, and a backup power source executes emergency propeller feathering; and after the propeller feathering is completed, the variable-pitch system continues to detect the state of the power grid, after the power grid recovers normal power supply, the system operates normally.

[Problem] To propose a control apparatus for an electric train, in which the regenerative energy of a DC power feed circuit can be consumed without disposing the brake chopper or electric-double-layer capacitor of the DC power feed circuit.

[Means] A control apparatus for an electric train according to this invention includes an AC electric motor which drives the electric train, and a variable-voltage variable-frequency inverter which controls the AC electric motor, and further includes an auxiliary power source device connected to a DC power feed circuit, and load control means for controlling a load connected to the auxiliary power source device, wherein the load control means receives an inverter state signal representative of an operation state of the variable-voltage variable-frequency inverter from the it, and the load control means controls the load in accordance with the inverter state signal. Besides, the control apparatus for the electric train includes detection means for detecting DC power feed information representative of the DC power feed state of the DC power feed circuit, and the load control means controls the load in accordance with the DC power feed information.

A control system includes a current sensor and one or more processors. The current sensor is configured to be disposed onboard a vehicle and to monitor a measured current conducted into a resistor leg of the vehicle. The resistor leg has a braking chopper and one or more resistive elements, and is connected with a traction bus of the vehicle. The one or more processors are configured to receive the measured current from the current sensor and, in response to the measured current differing from an expected current through the resistor leg, the one or more processors are configured to generate a control signal configured to one or more of increase an engine speed of an engine of the vehicle, increase cooling to the one or more resistive elements of the resistor leg, restrict movement of the vehicle, or schedule maintenance for the resistor leg.

A frequency converter assembly comprising a direct-voltage circuit and brake chopper means, the direct-voltage circuit including a first branch (DC+) and a second branch (DC−), and the brake chopper means including a first terminal (BRK+), a second terminal (BRK−), a brake chopper switch (S1) and control means (2). The brake chopper switch (S1) is arranged in its closed position to provide a braking connection, in which the first branch (DC+) is electrically connected to the first terminal (BRK+) and the second branch (DC−) is electrically connected to the second terminal (BRK−). The assembly is provided with a first operating state where the control means (2) are arranged to control the brake chopper switch (S1) selectively to the closed position and the open position in response to the desired power supply direction of the direct-voltage circuit. The assembly is further provided with a second operating state where the control means (2) are arranged to maintain the brake chopper switch (S1) continuously in the closed position.

The invention relates to a brake chopper composite busbar. With the brake chopper composite busbar adopted, problems such as large stray inductance of a main loop, poor circuit reliability, inconvenient installation, bloated structure, large occupied space and high design cost in the prior art can be solved. The brake chopper composite busbar of the invention includes an L-shaped flat O busbar, an L-shaped flat N busbar and an L-shaped flat P busbar which are stacked together; high-insulation strength materials are arranged between adjacent busbars; the O busbar is provided with an O connecting portion and O wiring terminals; the N busbar is provided with an N connecting portion and N wiring terminals; and the P busbar is provided with a P connecting portion and P wiring terminals. According to the brake chopper composite busbar of the invention, the stacked composite busbars are adopted to replace cables, copper bars or hot-compress busbars to perform electrical connection, and therefore, the complexity of previous wring can be lowered, and layout can be simple, and quality is more reliable; the size and weight of a system can be reduced, and repair and maintenance of a main circuit can be facilitated; and loop inductance can be reduced, and an IGBT can work safely and reliably, and the reliability of products can be greatly enhanced.

An electrodynamic brake system for a track-bound vehicle powered by a power line (10, 100) comprises: a current collector (11) for connecting the electrodynamic brake system to the power line (10, 100); a DC link (18) provided with a braking chopper (30), the DC link (18) being powered by the power line (10, 100) through the current collector (11); a static converter (20) operable in a rectifier mode and an inverter mode, the static converter (20) having DC terminals (19) connected to the DC link (18) and AC terminals, wherein electric current flows between the DC link (18) and the DC terminals (19) of the static converter (18) in an inverter direction when the static converter (18) operates in the inverter mode; an induction machine (22) operable as induction motor and in the alternator mode, the induction machine being mechanically linkable to a wheel axle (23) and electrically connected to the AC terminals of the static converter (20); a static converter control unit (36) for controlling the static converter (20) such that the static converter (20) operates in the rectifier mode and the induction machine (22) operates in the alternator mode to feed power back to the DC link (18) in response to an emergency braking signal, and an electrodynamic brake supervision unit (36) for shutting off the static converter (20) to isolate the induction machine (22) from the DC link (18) upon detection of a motoring condition during emergency braking.

The invention belongs to hoists and control technologies thereof, and provides a mine emergency lifting driving system which mainly comprises a standby emergency power supply, a group of change-over switches, a three-phase rectifier transformer, a rectifier, an inverter, a brake chopper, a brake resistor and the like. A control system in lifting electric control equipment is combined without changing lifting host equipment, so that the requirement of emergency lifting is met under the condition of 'double stop' of grid power or serious failure of a frequency conversion system in the lifting electric control equipment, and emergency lifting power is reserved for mine lifting, particularly cage lifting, mancar lifting, bucket lifting and the like for transporting personnel. When a fault occurs, passengers trapped in a shaft can be safely evacuated to a well mouth (ground) in a short time, a safety channel is provided for underground personnel or emergency rescue personnel and materials needing emergency evacuation, and the safety and the reliability of mine lifting are improved; and meanwhile, the equipment investment and the operation and maintenance cost are low, and the social and economic benefits are obvious.

A motor driver for driving a motor is disclosed. The motor driver has a first power bus, a first switching device coupled between the first power bus and a first terminal of the motor, a second power bus, a second switching device coupled between the second power bus and a second terminal of the motor, and an integrated braking chopper coupled between the first and second power buses. The integrated braking chopper is configured to dissipate an extra power generated by the motor.