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Read the latest magazines about Astable and discover magazines on Yumpu. com. Download scientific diagram | Multivibrateur monostable à amplificateur opérationnel. from publication: Electronique des impulsions | | ResearchGate, the . Cours: Multivibrateur astable. Un multivibrateur est un montage qui permet de produire un signale périodique non sinusoïdale ; en particulier un multivibrateur .

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It is an object of the present invention to reduce detection error of zero-phase current. A control device of a motor in which a winding is independently connected for each phase, the control device including: Ripple power having a first variation range is input into a DC link DC power supply lines.

Buffer power is provided and received between the DC link and a power buffer circuit, so that the DC link outputs DC power having a second variation range smaller than the first variation range. An inverter receives the DC power as an input, and outputs AC power to a motor. A power control unit controls the power buffer circuit and the inverter on the basis of a compensation rate that sets the second variation range.

Meaning of “multitâche” in the French dictionary

A compensation rate setting unit performs a setting in which the compensation rate when a rotational speed of the motor belongs to any of a plurality of first predetermined ranges is higher than the compensation rate when the rotational speed belongs to a second predetermined range other than the plurality of first predetermined ranges.

A method includes controlling a miltivibrateur power output to an electric machine during a transient event. Controlling the first power output includes measuring values of the first power output provided to the electric machine during the transient event, receiving an estimated speed input of the electric machine, determining adjustment commands to compensate the first power output for the transient event of the electric machine, generating switch commands for gate drives of a variable frequency drive VFD based at least in part on the adjustment commands, and modifying mltivibrateur first power output during the transient event based on the switch commands.

A power conversion device may include a first inverter to which one end of each phase winding of a motor is coupled, a second inverter to which the other end of each phase winding is coupled, and a switch circuit having at least one of a first switch element that switches between connection and disconnection of the first inverter to and from a ground, a first protection circuit being coupled in parallel to the first switch element, and a second switch element that switches between connection and disconnection of the second inverter to and from the ground, a second protection circuit being coupled in parallel to the second switch element.

An anomaly diagnosing device diagnoses an anomaly in a single motor driven multivibraheur multiple motor drive units. The multiple motor drive units supply AC currents to multiple multi-phase windings of the motor to drive the motor.

The anomaly diagnosing device includes: A diagnosis method for diagnosing a state of a motor includes an application step in which a voltage is applied to the motor on the basis of a non-rotating voltage signal that causes a rotation speed of the motor to become 0, and a measurement step in which a current supplied to the motor, to which the voltage has been applied, is measured. The diagnosis method includes a calculation step in which an electrical characteristic of the motor is calculated on the basis of the current of the motor measured by the measurement step, and a determination step in which an abnormality of the motor is determined on the basis of the electrical characteristic of dour motor calculated by the calculation step and a parameter related to the non-rotating voltage signal.

A control device capable of continuously operating an electric motor even when an abnormality occurs in a fan. The control device includes: A roof mount system supports a solar panel above a roof and includes a base positioned on the roof and a first fastener connected to the base and extending away from the roof and moveable along the base in a direction generally parallel to the roof. A first clamp supports a bottom surface of a solar panel frame and adjusts the height of the solar panel above the roof by moving the first clamp along a first fastener in a direction perpendicular to the roof.

Multiibrateur second clamp is connected to a second fastener and moves with respect to the first clamp perpendicular to the roof. The solar panel is clamped between the first clamp and the second clamp portion. A protrusion mkltivibrateur from the first or second clamp to form an electrical bond between the solar panel frame and the respective first or second clamp.

A mount for support of a component on a surface is provided.

Les Trois Physiciens – Henri Abraham – Éditions Rue d’Ulm

A base includes a bottom adapted to be supported on the surface, a circuit component, and a data pathway extending from the circuit component. A compressible component is mounted above the base and in electrical contact with the data kultivibrateur of the base, the compressible component having an uncompressed state in which the circuit component is not electrically accessible through the compressible component, and a compressed state in which a data pathway is formed through the compressible component multivirateur that the data pathway of the base is electrically accessible through the compressible component.

The compressible component is adapted to transition from the uncompressed state to the compressed state in response to a lag bolt passing through the compressible component and base and applying sufficient downward pressure to secure the base to the surface.

A photovoltaic PV module having bi-directional couplings is described. The bi-directional couplings include a first coupling mounted on a support frame under a first edge of the PV module and a second coupling mounted on the support frame under a second edge of the PV module. The PV module can be a keystone module and the bi-directional couplings of the keystone module can connect to respective couplings of several adjacent PV modules.

The bi-directional couplings can form male-to-female connections with the respective couplings to quickly combine the PV modules into a PV module assembly. The PV module assembly includes the bi-directionally connected PV modules supporting each other in both an x-direction and a y-direction. A light-concentrating, solar system, comprising: Since a twice-reflection structure is adopted, on one hand, the system can provide a higher light-concentration ratio; on the other hand, the height of the system can be reduced; and at the same time, a structural design of the system has better flexibility, so that a peripheral design, such as heat dissipation or heat energy utilization, of a photovoltaic panel can be performed more easily.

Power converter circuitry includes a direct current DC input comprising a first DC input node and a second DC input node, an alternating current AC output comprising a first AC output node coupled to the first DC input node and a second AC output node, a first boost switch coupled between the second DC input node and a boost intermediate node, a second boost switch coupled between the boost intermediate node and a common node, a boost inductor coupled between the boost intermediate node and the first DC input node, a link capacitor coupled between the second DC input node and the common node, a first half-bridge switch coupled between the second DC input node and a half-bridge intermediate node, a second half-bridge switch coupled between the half-bridge intermediate node and the common node, and a half-bridge inductor coupled between the half-bridge intermediate node and the second AC output node.


The photovoltaic installation comprising at least one photovoltaic module 1 and an electromechanical part capable of producing a non-parasitic electric arc of a duration less than or equal to a given arc extinction duration x when contacts in said part are opened, the method comprises the steps of detecting e 0 the appearance of an electric arc in a photovoltaic installation; triggering e 1 a timer to start timing from the moment t 0 of appearance of the electric arc; measuring e 3 at least one of the electric quantities of the group including a voltage vm of the at least one photovoltaic module and a current i produced by the installation at the end of the arc extinction duration starting from the moment t 0 of appearance of the arc; comparative testing e 4 ; e 5 in order to determine whether the measured electric quantity is equal to an open-circuit voltage voc of the photovoltaic module or to a zero current; and, if the test is negative, identifying a parasitic electric arc.

The invention relates to a method including the steps of measuring EO an electric current signal produced by the apparatus at a sampling rate no lower than 50 kHz, and, from the measured current signal, determining E 3 an initial value 10 of the current before the occurrence of an electric arc, determining E 5 current values Iarcj during the electric arc, evaluating E 6 arc voltage values from the current values determined during the arc and from the initial value of the current, integrating E 7 over time the product of the arc voltage values evaluated by the determined current values, in order to determine the energy of the arc.

A device comprises a platform constructed and arranged to be mounted to one or more solar array modules and one or more solar irradiance sensors on the platform configured to receive incident solar energy, the one or more solar irradiance sensors oriented on the platform so that the received incident solar energy is comparable to that received by the solar array modules, the one or more solar irradiance sensors providing solar irradiance signals in response to the incident solar energy.

A processor is on the platform, the processor configured to receive the solar irradiance signals and, in response, generating a performance reference metric based on the solar irradiance signals, the performance reference metric related to the expected performance of the one or more solar array modules to which the platform is mounted.

A transmitter is on the platform, the transmitter configured to periodically transmit the performance reference metric to a receiver. A solar cell monitoring device includes: A method for inspecting a solar cell and configured to inspect a peeling state of a three-dimensional pattern of the solar cell includes obliquely illuminating the three-dimensional pattern of the solar cell using a light beam.

An image of the solar cell is normally captured. An intensity of the light beam is increased to increase a contrast between the three-dimensional pattern and a shadow of the three-dimensional pattern in the image and increase a contrast between an ink pattern of the solar cell and the shadow in the image to overexpose the ink pattern in the image.

Determine if the three-dimensional pattern is peeling according to the shadow of the three-dimensional pattern in the image. A method, an apparatus, and a device for identifying a cell string fault in an optoelectronic system, where the method includes obtaining at least two groups of current-voltage I-V values of a first cell string in the optoelectronic system, performing fitting processing according to the at least two groups of I-V values using a predetermined physical string model to obtain at least one characteristic parameter of the first cell string, and comparing the at least one characteristic parameter with a pre-obtained standard characteristic parameter to determine whether the first cell string is faulty, or performing curve fitting processing on collected data using the physical string model.

Therefore, identifying the cell string fault in the optoelectronic system is not affected by inconsistency of environments, and processing efficiency and accuracy of string fault identification are effectively improved.

A voltage controlled oscillator VCOa method of designing a voltage controlled oscillator, and a design structure comprising a semiconductor substrate including a voltage controlled oscillator are disclosed.

In one embodiment, the VCO comprises an LC tank circuit for generating an oscillator output at an oscillator frequency, and an oscillator core including cross-coupled semiconductor devices to provide feedback to the tank circuit. The VCO further comprises a supply node, a tail node, and a noise by-pass circuit connected to the supply and tail nodes, in parallel with the tank circuit and the oscillator core.

The by-pass circuit forms a low-impedance path at a frequency approximately twice the oscillator frequency to at least partially immunize the oscillator core from external noise and to reduce noise contribution from the cross-coupled semiconductor devices. The invention disclosed fast start-up single-pin crystal oscillation apparatus and operation method thereof. The apparatus comprises a comparator, an envelope detector, a trigger, a crystal, a finite state machine, an amplifier gain module, a load capacitor module and a bias resistor.

Compared to prior arts, the invention uses a single-pin oscillator structure to remove two external load capacitors, reduces start-up time, increase negative resistance, reduce load capacitor, and uses fast start-up algorithm to make the oscillation circuit operating at optimal power-consumption.

A power amplifier circuit includes a transistor, a bias current source, and an adjustment circuit. The transistor amplifies an RF signal when supplied with a variable power supply voltage. The bias current source supplies a bias current to the base of the transistor through a first current path.

The adjustment circuit increases a current flowing from the bias current source to an input terminal of a matching circuit through a second current path as the variable power supply voltage decreases, and decreases the bias current flowing from the bias current source to the base of the transistor through the first current path as the current flowing from the bias current source to the input terminal through the second current path increases.

Fast envelope tracking systems are provided herein. In certain embodiments, an envelope tracking system for a power amplifier includes a switching regulator and a differential error amplifier configured to operate in combination with one another to generate a power amplifier supply voltage for the power amplifier based on an envelope of a radio frequency RF signal amplified by the power amplifier. The envelope tracking system further includes a differential envelope amplifier configured to amplify a differential envelope signal to generate a single-ended envelope signal that changes in relation to the envelope of the RF signal.

Additionally, the differential error amplifier generates an output current operable to adjust a voltage level of the power amplifier supply voltage based on comparing the single-ended envelope signal to a reference signal. Embodiments of circuits for use with an amplifier that includes multiple amplifier paths include a first circuit and a second circuit in parallel with the first circuit. The first circuit includes a first input coupled to a first power divider output, a first output coupled to a first amplifier path of the multiple amplifier paths, and a first adjustable phase shifter and a first attenuator series coupled between the first input and the first output.


The second circuit includes a second input coupled to a second power divider output, a second output coupled to a second amplifier path of the multiple amplifier paths, and a second adjustable phase shifter coupled between the second input and the second output.

A radio frequency RF front-end for a transmitter in a complementary metal-oxide-semiconductor CMOS includes a mixer based core that itself includes first and second input signals; an amplifier that amplifies the first signal and transmits a corresponding amplified first signal; an up-conversion mixer that receives the amplified first signal and the second signal through transistors, and mixes the amplified first signal and second signal and generates a radio frequency RF signal; and an antenna that receives the RF signal and transmits the signal from the front-end.

A multimode power amplifier module, a chip and a communication terminal. In the module, a control circuit sends a bias signal to a low-frequency power amplifier or a high-frequency power amplifier according to a baseband signal, so as to control the amplification of an accessed low-frequency radio frequency signal or a high-frequency radio frequency signal by the low-frequency power amplifier or the high-frequency power amplifier ; and a transceiving switch selects a corresponding operation mode to conduct transmission or receiving according to an operation mode selection signal.

A power amplification path is reused according to different modes, so that the power amplification path can be shared by different operation modes of a high and low frequency band with the adjustment of the control circuitthus simplifying the complexity in designing the power amplifier module, and reducing the cost of relevant design implementation. A method and system for digital pre-distortion of an input signal to compensate for non-linear operation of a power amplifier.

According to one aspect, some embodiments provide overlapping spline functions that are defined for two adjacent bins, where any two spline functions overlap in only one bin. Each spline function is computed as a function of one of an input signal envelope and a delayed signal envelope. According to another aspect, a tap weight evaluator includes a least mean squares, LMS, tap correlator updater configured to modulate a step size of an adaptation process to update each tap weight, the step size being modulated based on an approximate logarithm of the average power of the input to a tap weight computation.

An I-V conversion module includes: The current output type sensor is connected to an input end of the I-V transformation circuit through the pre-integral circuit. The charge transfer auxiliary circuit connects in parallel with the inverting amplifier. When both the pre-integral circuit and the charge transfer auxiliary circuit are open circuits, the pre-integral circuit pre-integrates the induction current output by the current output type sensor to store pre-integral charges.

When both pre-integral circuit and the charge transfer auxiliary circuit are closed circuits, the pre-integral charges are transferred to the I-V transformation circuit.

In these embodiments, both the time for establishing the I-V conversion module and power consumption can be reduced. High bandwidth envelope trackers are provided herein.

In certain embodiments, an envelope tracking system for a power amplifier includes a switching regulator that operates in combination with a high bandwidth amplifier to generate a power amplifier supply voltage for the power amplifier based on an envelope of a radio frequency RF signal amplified by the power amplifier. The high bandwidth amplifier includes an output that generates an output current for adjusting the power amplifier supply voltage, a first input that receives a reference signal, and a second input that receives an envelope signal indicating the envelope of the RF signal.

The second input has lower input impedance than the first input to provide a rapid transient response and high envelope tracking bandwidth. Various methods and systems are related to pulse-based automatic gain control. In one example, pulse-based automatic gain control AGC includes a variable gain amplifier VGA configured to amplify an analog input signal to generate an analog output signal based upon an amplification control signal; an integrate-and-fire IF sampler configured to generate a pulse train corresponding to the analog output signal; and a gain adjustment configured to generate the amplification control signal based upon a comparison of time between pulses of the pulse train to a reference time.

In another example, a method includes determining time between pulses of a pulse train corresponding to an analog output signal from a VGA; generating an amplification control signal based upon a comparison of the time between pulses of the pulse train to a reference time; and adjusting amplification of the VGA in response to the amplification control signal. Provided is a power amplification module that includes: The operation of the first amplification circuit is halted and the first signal passes through the feedback circuit and is outputted as the second signal at the time of a low power output mode.

This invention relates to analog phase shifters, and more particularly, to analog phase shifters for controlling the phase of an RF signal over a wide range of frequencies with nearly linear phase change. An exemplary phase shifter includes a front end high-low pass filter, a back-end high-low pass filter, and an all-pass filter coupled in series between the two high-low pass filters. At least one of the filters is tunable for controlling the phase of an input signal over a wide range of frequencies.

The high-low pass filter comprises low-pass filters as input and output interface for the high-low pass filter to facilitate impedance match for receiving and outputting RF signal.

In some examples, a delay apparatus includes a controllable delay line comprising a plurality of delay elements selectively connected in a signal path to vary a delay of a signal passing through the delay line, and a controllable phase shifter comprising reflective loads adjustable to vary a phase shift applied to the signal. An apparatus for a network matching switch is provided. The apparatus includes a primary winding, a first secondary winding, a second secondary winding and a plurality of matching network paths.

The primary winding is configured to generate a magnetic field based on an analog input signal. Multivibtateur first secondary winding is configured is inductively coupled to the primary winding. The second secondary winding is inductively coupled to the primary winding.

The plurality of matching network paths are coupled to the first multlvibrateur winding and the second secondary winding. An active path is selected from the plurality of matching network paths and provides power to an active load.