49 results about "Braking chopper" patented technology

Provided is an electric vehicle driving device which consumes regenerative energy at a brake resistor, wherein a harmonic component produced by a brake chopper switching circuit can be reduced. A plurality of brake chopper switching circuits (3) are provided in parallel for each inverter (6). Harmonic components produced by the brake chopper switching circuits (3) are reduced by mutually changingthe phase or frequency of the carrier triangular wave of each of the switching circuits (3).

The present invention provides an efficient operation utilizing regenerative energy, and also provides a maintenance-saving and low-cost vehicle control unit and a vehicle provided with the vehicle control unit. A vehicle control unit includes an ac motor (7) for driving a vehicle, an inverter (6) for converting a direct current into an alternating current of variable voltage and variable frequency to drive the ac motor (7), a brake chopper (4) formed by a series circuit consisting of a resistor (401) and a switching element (402) connected to the direct current side of the inverter (6), and an electricity storage device (5) connected to the direct current side of the inverter (6). Thereby, regenerative energy can be stored and utilized effectively. Also, when the electricity storage amount exceeds the upper limit, the regenerative energy can be consumed by the brake chopper (4), so that a mechanical brake (10) need not be used, and thereby the maintenance can be reduced.

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.

[PROBLEMS] To provide an electric car control apparatus capable of consuming a regenerative energy of a DC feeding circuit without providing any electric double layer capacitor or any brake chopper for the DC feeding circuit. [MEANS FOR SOLVING PROBLEMS] An electric car control apparatus has an AC electric motor for driving the electric car and also has a voltage-variable, frequency-variable inverter for controlling the AC electric motor. The electric car control apparatus further has an auxiliary power supply apparatus connected to a DC feeding circuit and still further has a load control means for controlling a load connected to the auxiliary power supply apparatus.; The load control means receives, from the voltage-variable, frequency-variable inverter, an inverter status signal representative of an operating status thereof and controls the load in accordance with the inverter status signal. Moreover, the electric car control apparatus has a detecting means for detecting DC feeding information representative of a DC feeding status of the DC feeding circuit. The load control means controls the load in accordance with the DC feeding information.

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.

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.

[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.

The invention relates to a non-track electric vehicle over-potential protecting method and relative device, which arranges a composite electric vehicle over-potential protector in present protecting circuit, that uses a protective lock and a chopper control to protect, and uses brake chopper, hardware controlled chopper and protective lock to realize three-stage over-potential protection. The first stage is brake chopper protection, the second stage is hardware controlled chopper protection and the third stage is protective lock protection. The electric vehicle over-potential protective main circuit is connected with a chopper tube controlled by an inverter control system in the main circuit, while the cathode of the chopper tube is serially connected with a brake resistance, and the inverter control system and the anode of chopper tube are serially connected with a protective lock control system serially connected on the anode circuit between a potential sensitive resistance and a capacitor.

A method for controlling brake resistors and a brake chopper, the number of brake resistors being two or more and the brake resistors being connected in series with switches to be controlled, the series connection being connected between a positive and a negative rail of a DC voltage intermediate circuit, the method comprising the step of determining a magnitude for a voltage of the DC intermediate circuit; and determining a first voltage limit and a second voltage limit. The method further comprises the steps of switching brake resistors to the intermediate circuit in a periodically alternating manner, each switch being switched during a switching period and the on-period of each switch in a switching period being responsive to the magnitude of the voltage in the DC voltage intermediate circuit when the voltage is above the first predetermined limit and below the second predetermined limit.

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.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 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.

A method for controlling brake resistors and a brake chopper, the number of brake resistors being two or more and the brake resistors being connected in series with switches to be controlled, the series connection being connected between a positive and a negative rail of a DC voltage intermediate circuit, the method comprising the step of determining a magnitude for a voltage of the DC intermediate circuit; and determining a first voltage limit and a second voltage limit. The method further comprises the steps of switching brake resistors to the intermediate circuit in a periodically alternating manner, each switch being switched during a switching period and the on-period of each switch in a switching period being responsive to the magnitude of the voltage in the DC voltage intermediate circuit when the voltage is above the first predetermined limit and below the second predetermined limit.

The present invention provides a DC electric drive device and an electric device comprising the DC electric drive device. The DC electric drive device comprises a DC motor, a DC power supply, an instruction sending part, an output sensor, a controller, a driver and a chopper. The device is characterized in that the DC motor is provided with 2j mutually independent armature winding branches wound up by m windings, 2j*m commutator segments connected with the windings, and 2j mutually independent electric brushes connected with the chopper and in contact with the commutator segments. The chopper is a half-bridge chopper and comprises j mutually independent chopper units. The DC power supply comprises j mutually independent power supply units. Each power supply unit is connected with one chopper unit in the one-to-one correspondence manner. Each chopper unit is correspondingly connected with one electric brush through a current output line so as to power on the armature winding branch connected with the above electric brush, wherein j and m being a positive integer not less than 2.

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.

A voltage supply device includes at least one intermediate circuit that has at least one intermediate circuit capacitor, at least one power converter, wherein the power converter is connected to the connections of the intermediate circuit such that the power converter can be supplied with electrical energy from the intermediate circuit capacitor, and includes at least one braking chopper that is connected to the connections of the intermediate circuit capacitor such that electrical energy from the intermediate circuit capacitor can be converted into thermal energy by the braking chopper, where the power converter is equipped with at least one semiconductor switch that is clocked at a higher rate, in particular based on SiC, while the braking chopper is equipped with at least one semiconductor switch that is clocked at a lower rate, in particular based on Si.

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.

The invention relates to the technical field of converters, in particular to a traction-auxiliary converter for an internal combustion locomotive and a converter cabinet, and aims at solving the technical problems that an existing internal combustion AC transmission locomotive is low in integration level, poor in energy conservation and emission reduction effect and large in occupied locomotive space. The traction-auxiliary converter comprises a rectifier electrically connected with a main generator, the rectifier is connected with an intermediate direct-current loop; a grounding detection module, a manual discharge module, a brake chopper and an inverter group which are connected in parallel are arranged in the intermediate direct-current loop, the brake chopper is provided with a chopperbrake resistor, and the inverter group comprises an auxiliary fixed-frequency inverter, an auxiliary variable-frequency inverter and three traction inverters which are connected in parallel. The converter cabinet comprises two groups of converters, the auxiliary fixed-frequency inverters of the two groups of traction-auxiliary converters are electrically connected through a fixed-frequency expansion loop, and the auxiliary variable-frequency inverters of the two groups of traction-auxiliary converters are electrically connected through a variable-frequency expansion loop.

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.

An electrical circuit for a power converter is described. The circuit has been provided with several semiconductor switches and capacitors used for operating the power converter. A brake resistance for lowering energy is provided and is connected to the semiconductor switches provided without the need for an additional switch. The operation of the power converter and the current flowing through the brake resistance can be controlled by means of the existing semiconductor switches.

The invention concerns multistage power switching electronic device for reducing undesirable harmonics amplitudes generated in said device, in particular in the form of beats, comprising at least an input filter (1), a rheostatic braking chopper (2) including at least two switches (Fr1, Fr2) and mutlilevel static converter (4) including at least four switches in series (T1, T2, T3, T4). The invention is characterised in that the oscillator (4) is directly attached to the chopper (2) providing a connection by their midpoint (X = X') and it comprises a variable random frequency pulse generator controlling the switches of said chopper (2).

The invention relates to a metro traction inverter chopper power unit, which is composed of a radiator, seven IGBT devices, seven IGBT configuration boards, four IGBT drive boards, diode devices, six absorption capacitors and composite busbars. The invention concentrates the brake chopper circuit and the inverter circuit on one power unit, shares a set of heat pipe radiators, and reduces the space occupied by the vehicle. The main circuit busbar adopts composite busbar, which reduces the electrical gap between the busbars, between the busbar and the supporting frame, and absorbs circuit accessories, reduces the volume of the power unit, and increases the reliability. The stacked structure is adopted, and the IBGT drive board components are uniformly installed on the outside of the module, which is convenient for replacement and maintenance. The invention reduces the volume of the entire power unit, saves space, improves maintenance efficiency, further improves the utilization rate of subway trains, and saves operating costs.