The present disclosure relates to a power conversion system comprising a transformer comprising first, second, and third inductive coupling elements, a first power supply arranged to provide a voltage across the first coupling element, a second power supply arranged to provide a voltage across the second coupling el...

A method and a control system for a multiphase-phase inverter system, the control system comprising an electric current detection circuit and a processor, wherein each phase of an electrical cycle is separated into a plurality of sections, inputs from the electric current detection circuit are received, each input i...

A method for controlling the temperature of a first semiconductor device on an inverter module of a drive configured to drive an electrical machine is disclosed. The method comprises calculating at least one harmonic component of at least one power loss of at least the first semiconductor device; using the at least ...

Method and tool for assisting alignment of one or more pin headers on a PCB are disclosed. Method comprises placing the pin header (10) on a (PCB) (20) such that the pins (16) on a first side of a collar (12) engage the surface of the PCB (20). A removable tool (30) exerts a force on the pins (16) causing the collar...

A method of controlling a switching frequency of an inverter, the method comprising the steps of: measuring a signal indicative of a temperature variable at a first switching frequency to determine a measured temperature variable; comparing the measured temperature variable to a first threshold; determining if the m...

The present disclosure relates to a plate for use with a heatsink. The plate is adapted to engage with the heatsink and a fan subassembly, and comprises a first substantially planar section which is adapted to engage with the heatsink and a second substantially planar section which is adapted to engage with the fan ...

A power converter system comprises an electrical load, a power converter having a variable frequency output connected to the load, a controller operably connected to control the output of the power converter, means for producing a signal indicative of a load current, means for deriving a value of switching frequency...

A control module for use within a control network, the control module comprising: interface circuitry for enabling communication with an external device; communication means configured to communicate with the external device over the control network by communication with the interface circuitry; coupling means confi...

A method of controlling a power output of an inverter (12) is provided, comprising measuring an output current (IA) of the inverter (12), determining a difference between the output current (IA) and a reference current (IA*), and controlling a reference input voltage (VDC*) of the inverter (12) as a function of the ...

A circuit for an electrical load comprises a passive transformer, the secondary of which is connected to power cells for each phase according to the transformer tappings. Each power cell comprises a low cost but efficient power factor correction circuit to produce lower harmonics on the transformer. ...

A device is provided in which messages are received from a backplane through backplane connectors. Switching circuitry identifies which messages received from the backplane are intended for the operational circuitry of the device and interprets the input/output protocol of such messages while returning messages not...

A turn-on drive circuit for a power transistor comprising a first circuit comprising a resistor and capacitor in parallel and a second circuit comprising a resistor, the second circuit being in series in the drive path with the first circuit. A turn-off drive circuit for a power transistor comprising a first circuit...

A ground fault detection circuit comprising a fuse and a fuse detect circuit. The fuse and the fuse detect circuit are arranged to be coupled in parallel between a reference point and a second point of a monitored circuit for which ground faults are to be detected. The fuse detect circuit is further arranged to dete...

An apparatus for detecting an arc on a circuit having a solar panel assembly is arranged to determine that an output of the solar panel assembly is below a threshold value and is therefore indicative of an arc on the circuit.

A method for configuring a drive to control the operation of a pump in a sewage system is disclosed. The method comprises measuring at least one parameter of the sewage system; using the measurement of the at least on parameter to create an algorithm for the drive to control the operation of the pump; and configurin...

Apparatus for preventing output of an input signal is disclosed, which comprises a signal control unit comprising a buffering unit having an input and an output, the buffering unit arranged to receive an input signal and pass the input signal to the output when the buffering unit is powered. A negative power supply ...

A circuit is arranged to detect a voltage imbalance indicative of component failure and, upon such detection, convey an optical signal to indicate that a component appears to have failed.

A method, apparatus, computer readable medium, and system for synchronising a power source with a three-phase electricity grid for the power source to supply electricity to the electricity grid is disclosed.  The method comprises operating a first switching unit to disconnect a power source from an interfacing circu...

A demountable electrical panel comprises a spring under tension that is easily assembled by being laid to rest in a recess in a mounting plate put under tension to make electrical contact with a circuit board when the device is assembled.

Method of cooling devices generating heat is described, which includes monitoring temperature and automatically operating cooling means at a first rate if the monitored temperature rises above a first temperature threshold and automatically at a second increased rate if it rises above a second temperature threshold....

There is provided a motor drive comprising: a temperature sensor arranged to sense a temperature of the drive; a braking resistor; switching means arranged when activated to cause current to flow to the braking resistor; and controlling means arranged to activate the switching means when the sensed temperature falls...

An apparatus is provided comprising an enclosure for enclosing a printed circuit board (PCB). The PCB has a tab extending therefrom. The enclosure comprises first and second portions, one of which includes a recess arranged to receive the tab of the PCB.

An adapter is provided for adapting a Secure Digital (SD) card for use with a Smart Card reader. The adapter comprises an improved Smart Card with a memory device physically connected thereto. A controller may also be provided for use with the Smart Card reader, the controller being configured to identify whether a ...

An energy bypass circuit for connection between an energy source and a capacitance has first and second relays, a switch, and a resistance. The relays are operable so as to have a first state in which the energy source is not connected to the capacitance, a second state in which the energy source is connected to th...

A circuit for self-diagnosis and control comprising a plurality of processing devices each having a voltage supply, the processing devices being arranged to communicate with one another and being arranged to be electrically isolated from each processing device having a different voltage supply. Fig.1 ...

A damage limitation method for use with a device having a rectifier circuit and a soft-start circuit coupled to an input of the rectifier circuit, the soft-start circuit having: a resistive element for passing current between a source and the rectifier circuit, and a switch operable to allow current passing between ...

A fail-safe interface, to an inverter, the interface comprising a safe and reliable enable function is provided by way of discrete components with well-defined failure modes. The interface does not require complex circuits or architecture nor electro-mechanical devices that are inherently unreliable, have a short li...

A clamp for a choke is provided, the clamp comprising a component configured to hold a choke and at least one electrical connector receiving element for receiving one or more electrical connectors of a choke. The clamp is fitted to the choke and then the assembly is fitted into a device, such as a chassis. ...

There is described an electronic assembly comprising a structure and a printed circuit board (PCB) connected to. the structure to form a duct. The PCB has a first side arranged to receive one or more heat-generating components, and a second side. The PCB comprises one or more apertures formed therein. The electronic...

Embodiments of the present invention relate to an a method, apparatus and computer program product for controlling the operation of a drive unit comprising a plurality of switching modules arranged to receive a DC electricity supply and generate an AC electricity supply for driving a load from the received DC electr...

An apparatus for connecting two or more circuit boards, the apparatus comprising: a first circuit board comprising a first surface and a second surface, the second surface having a first conductive pad; a second circuit board comprising a third surface and a fourth surface, the third surface having a second conducti...

The present disclosure relates to a method of determining an offset between a detector and a point on a motor, the movement of the point on the motor being impeded in at least one direction. In particular, this disclosure relates to a method of determining a commutation offset for an encoder that works in conjunctio...

A method for controlling the temperature of a component is disclosed. The component is part of a drive configured to drive an electrical machine via an electrically conductive member. The method comprises determining a value of an attribute of the electrically conductive member; configuring a model to calculate the ...

The present disclosure relates to a power conversion system comprising a transformer comprising first, second, and third inductive coupling elements, a first power supply arranged to provide a voltage across the first coupling element, a second power supply arranged to provide a voltage across the second coupling el...

A method for communicating between devices in a network, the network including first and second nodes, the method comprising transmitting a message from the first node to the second node, wherein the message comprises a data content portion and an identifying portion, wherein the identifying portion includes a first...

A control device, a control method and system for controlling switching in/out of execution device in a system having plurality of execution devices in parallel, are disclosed. A group of execution devices perform predetermined operations on an execution object. The control device comprises feedback unit configured ...

There is provided a method of controlling a power output of an inverter drive (22) operably connected via an electrical machine (16) to a component (18). The component (18) is arranged during operation to generate a variable force having one or more periodic frequency components. The method comprises determining the...

There is provided a method and control system for reducing noise in a power converter by controlling a switching device in the power converter according to a modulation scheme. The switching device couples a direct current (DC) source to provide an alternating current (AC) output at a particular switching frequency....

A device for use with a printed circuit board, PCB, the device being arranged to electrically connect to a component on the PCB and comprising a first layer having a first hole therethrough and a second layer having a second hole therethrough, the second hole arranged to receive a connector to connect the device to ...

An adaptor is provided for use with the heat sink,said heat sink comprising a base for contacting a heat source and a plurality of protrusions extending from said base. The adaptor itself comprises a base and a structure projecting therefrom. The structure is arranged to mate with one or more protrusions on the heat...

A method of controlling an electrical power supply to a load, wherein said load has an associated power threshold, is provided. The method comprises using a first electrical power source to generate a first amount of power for supply to the load, wherein said first electrical power source comprises a renewable sourc...

A method arranged to control a motor for driving a load is disclosed. The motor and load form at least a part of a system and the motor comprises a stator arranged to produce a varying magnetic field responsive to an applied AC voltage and a rotor arranged to rotate responsive to the varying magnetic field produced ...

A method and apparatus to monitor the condition of an apparatus (e.g a variable speed drive), the apparatus comprising: a processor, a plurality of devices and a plurality of temperature sensors, each sensor associated with a device, the processor being arranged in use to: determine, for each of a plurality of senso...

A semiconductor device driving unit to supply a drive signal to a gate of a semiconductor switching device, the semiconductor device driving unit comprising: a plurality of gate impedance circuits selectably connectable to the gate of the semiconductor switching device; and a selector to select one or more of the ga...

A method for setting-up a module of a modular industrial control system so that the module is easily integrated into the modular system is disclosed along with a method for setting-up a modular industrial control system for connecting a new module to the modular industrial control system, a module for forming part o...

A mounting latch for mounting a device to a rail is provided. The mounting latch comprises: a moveable actuator having a profile; a latch mechanism comprising first and second opposed rail engaging members, at least one of the members having a face for causing the member to yield against bias means when the latch me...

A method is provided for determining a value for an electrical output of a converter of renewable energy. The method comprises obtaining a signal representing the electrical output of the converter wherein that electrical output has an initial value. The method further comprises applying a pulse signal to the signal...

This disclosure relates to a method, apparatus, system and computer program product for controlling a motor at low operational speed. A method for controlling a motor at low operational speed, wherein the motor comprises a magnetic rotor 20 and a stator 10 arranged to produce a magnetic field responsive to an applie...

There is provided a first, connecting printed circuit board (PCB) and a second, receiving PCB and a method for connecting the first and second PCBs. The first PCB has three projections or prongs extending from the main body of the PCB. The second"PCB has three holes into which the prongs of the first PCB can be inse...

A drive apparatus is provided which comprising a ducting piece coupled to a drive comprises an air vent. The base of the ducting piece is open to receive exhaust gases from the drive and the ducting piece then diverts these gases horizontally. A system may be provided comprises a plurality of such apparatuses, with ...

A circuit for monitoring the operation of an electric motor comprises means for deriving a motor signal indicative of a relatively low frequency characteristic of the motor commutation current (for example the back EMF ripple) by rejecting the high frequency components which are mainly the result of the commutation ...

A rectifier circuit comprising an AC input, at least one thyristor coupled to the AC input, a DC bus driven by the at least one thyristor, a controller arranged to: derive a first current in the DC bus. derive a maximum current demand on the DC bus, and provide a trigger signal to the at least one thyristor based on...

Conducting emission suppression in a power circuit for an electric motor comprises a negative temperature co-efficient resistor and capacitor connecting one of the power lines to ground. The NTC resistor is self-stabilising so that changes in the load current are automatically compensated for.

A power supply arranged to charge a smoothing capacitance via a resistive element for soft-starting in the event that one or more conditions for normal operation are not complied with is arranged to detect that a voltage across at least part of the smoothing capacitance exceeds an excess voltage threshold and, respo...

A mount for supporting a housing of electrical equipment comprises a rectangular frame and a floating strut which rests on the frame to sub-divide the aperture into smaller spaces each for a housing. The frame of the strut engages a gasket on the housing to seal each side of the frame from the other. Multiple housin...

The invention relates to an enclosure 100 for a drive unit. The enclosure 100 has a plurality of faces and is arranged to house components. A first face of said plurality of faces comprises an outer portion and at least one recessed portion. A first projection is provided projecting from a recessed portion of the fi...

A DC motor drive (100) including power electronics (120) and control electronics (130). The power electronics (120) are arranged to receive a high voltage power supply and to controllably output that supply to a DC motor to controllably operate the motor. The control electronics (130) are arranged to receive a low v...

An electrical power generating system based on a photovoltaic cell array comprises means for monitoring the output of the array in order to determine whether the output is sufficient to sustain supply to a connected power network. The output of the array is monitored by sensing the voltage across a resistor connecte...

An apparatus (10) for protecting an electronic circuit from an airflow comprises a base (12) including a cover means for covering at leapt part of the electronic circuit. The apparatus further includes a guide means for guiding the airflow around the electronic circuit.

A drive unit for housing components of a drive system for an electrical machine, such as an electric motor, comprises a cabinet having opposed first and second relatively narrow faces and a wide face between them. An interface for inputting and deriving data is mounted on a bracket to the unit and faces in the same ...

An electronic component including one or more legs for attachment to a circuit board, wherein at least one of said legs includes a spring-acting kink, arranged so as to offers resilience to relative displacement between the end of said leg and the body of said component. The kink may be substantially S-shaped, Z-sha...

A sealing element (1) comprising, in cross-section, a body (7a) and a first sealing part (8a).The first sealing part (8a) providing a sealing face (12a), the first sealing part being connected to and angularly and resiliently displaceable relative to a first surface of the body (7a).

There is provided a fan guard for mounting on an electrically-operated axial-flow fan. The fan guard comprises a plurality of fasteners for extending into a plurality of respective holes on the fan and further comprises a projection projecting outwardly from the fan guard from a central support which, in use, is coi...

A method of managing recovery from an event in an electrical circuit leading to a loss of control of an inverter in the electrical circuit is disclosed, the method comprising sampling a parameter of operation before the event, monitoring for occurrence of the event, calculating an estimated value of the parameter at...

A method of reducing periodic disturbances in the feedback quantity of a controlled system is disclosed. The method includes receiving a feedback signal and repeatedly deriving respective magnitudes of harmonic components of the feedback signal to produce corresponding error signals. The error signals and harmonic c...

A capacitor bank comprising at least two series chains each comprising a plurality of capacitors, wherein the series chains are coupled in parallel at corresponding points; and a fusible link arranged to form at least part of each coupling; wherein the corresponding points of each chain that are coupled to one anoth...

A desaturation detection circuit for use between the desaturation detection input of an optocoupler and the output of a power switching device, the desaturation detection circuit comprising:a threshold setting element having an input and an output, the input for connection to the output of a power switching device v...

A method is disclosed for controlling at least four switching components of a multi-level converter. The method comprises receiving first and second control signals for controlling a dual-level inverter having two switching components, and processing the first and second received control signals to produce at least ...

An apparatus is provided for producing a compensated voltage output comprising at least one photovoltaic module biasing means connected in series with the at least one photovoltaic module. The biasing means is operable to generate a controllable bias voltage for modulating an output voltage of the at least one photo...

A method of controlling a current flowing through a component of a drive comprising the steps of: estimating the current flowing through a component; estimating the temperature of the component; comparing the estimated temperature with a desired maximum temperature for the component; and adjusting the current flowin...

A latch mechanism is provided comprising a latch and a cover arranged for attachment to the latch. The latch includes a latch body and a projection extending therefrom wherein, when the latch and cover are attached to one another, the projection extends from an inner surface of the cover. The latch mechanism further...

A voltage measurement is made between two points in a circuit. If the measured voltage exceeds a predetermined amount, a switch is operated to electrically connect the two points.

A method of driving a power conversion system is provided, the power conversion system comprising a DC source and an inverter configured to receive DC power from the DC source, the inverter comprising one or more AC terminals for supplying AC power at an output frequency and an inverter switching network comprising ...

An inverter circuit comprises an inverter which can be configurable for controlling the supply of mains current from a grid to an electric machine in a start-up mode whereby the machine drives the prime mover for initialisation. Thereafter the same inverter is reconfigurable as part of the circuit to supply reactive...

A fail-safe interface circuit arranged to provide an inverter enable input to drive an inverter, the circuit being supplied by a first voltage and comprising: a charge pump comprising a charge pump input and a charge pump output, the charge pump output being coupled to a circuit output; and a pulsed input arranged t...