31 results about "Negative inductance" patented technology

The invention relates to the field of electronics, more particularly to the wire bonds incorporated into an integrated circuit package such as a quad flat pack, a ball grid array or hybrid style module. The present invention takes the normally undesirable wire bond inductance and uses it in an operational circuit where positive inductance is required. The circuit in which the wire bond inductance is used is located primarily in the integrated circuit die housed in the integrated circuit package, but may also include off-die components. In one example, a wire bond is used as the required series inductance in a discrete circuit impedance inverter which consists of two shunt-to-ground negative inductances and one series positive inductance. One of the negative inductances is located on-die, while the other is located off-die.

A differential circuit topology that produces a tunable floating negative inductance, negative capacitance, negative resistance / conductance, or a combination of the three. These circuits are commonly referred to as “non-Foster circuits.” The disclosed embodiments of the circuits comprises two differential pairs of transistors that are cross-coupled, a load immittance, multiple current sources, two Common-Mode FeedBack (CMFB) networks, at least one tunable (variable) resistance, and two terminals across which the desired immittance is present. The disclosed embodiments of the circuits may be configured as either a Negative Impedance Inverter (NII) or a Negative Impedance Converter (NIC) and as either Open-Circuit-Stable (OCS) and Short-Circuit-Stable (SCS).

The invention relates to an Electromagnetic Interference (EMI) filter circuit (Fa) for suppressing a Line Conducted Interference (LCI) signal. The EMI filter circuit (Fa) comprises a filter inductance (Lo) to carry a supply current (Isup) between a supply voltage (Vsup) and a load (L). The EMI filter circuit (Fa) further comprises an active circuit (Ca), arranged in parallel with the filter inductance (Lo). The active circuit (Ca) comprises a sensing circuit (Mm) to sense the LCI signal and further comprises a suppressing circuit (Ms) to suppress the LCI signal. In an embodiment of the active EMI filter circuit (Fa), the active circuit (Ca) comprises a negative inductance generating circuit to create a negative inductance value. Selecting the negative inductance generating circuit to create an inductance value (Lca) larger than the inductance value of the filter inductance (Lo) creates a resulting inductance (Lr) which is higher compared to the inductance value of the filter inductance (Lo). In one embodiment, the negative inductance generating circuit comprises a negative impedance converter.

An inductor structure comprising a substrate and a planar conductor structure on a surface of the substrate, and methods for fabricating an inductor structure. The planar conductor structure may comprise a vertical stack of three or more multilayer films. Each multilayer film may comprise a first layer of a first metal, defining a first vertical thickness, and a second layer of a second metal, defining a second vertical thickness. The metals and thicknesses are chosen such that the inductor exhibits a negative electrical self-inductance when an electrical signal is transmitted from a first contact point to a second contact point.

This antenna array includes at least one primary antenna, at least one secondary antenna and at least one load coupled to a secondary antenna. The load includes two separate components, a first component being a resistor and a second component being selected from an inductor or a capacitor. The antenna array can include one or more of the following characteristic features, taken into consideration individually or in accordance with any technically possible combinations: the first component has negative resistance; the second component has negative inductance or a negative capacitance; at least one load has an adjustable impedance. The antenna array may be used in a system, such as a vehicle, a terminal, a mobile telephone, a wireless network access point, a base station, or a radio frequency excitation probe.

The invention provides an inverter virtual impedance vector diagram analysis method. The size and nature of output impedance at the fundamental frequency of an inverter are analyzed under different types of virtual impedances added. By introducing virtual impedance, the size and nature of the original output impedance of an inverter can be changed, and an inverter output impedance can be acquired as needed. A virtual impedance module is added on the basis of the original voltage and current double-closed-loop feedback control system. The adopted current feedback is inductive current feedback. Thus, the change in output impedance at the fundamental frequency of an inverter under five conditions, namely, adding virtual positive inductance, adding virtual negative inductance, adding virtual positive resistance, adding virtual negative resistance, and adding virtual complex impedance composed of virtual positive resistance and virtual negative inductance, can be analyzed and verified based on a vector diagram and a corresponding Bode diagram.

The invention discloses a low-voltage micro-grid inverter control system based on virtual impedance and virtual power supply. The control system is divided into a droop controller, a virtual controller, and a voltage / current double-loop controller; by improving the droop parameters, a virtual inverter capable of simulating The droop controller with power supply function uses fractional order PID to track and control the droop controller voltage; by analyzing the relationship between virtual negative inductance and micro-source reactive power sharing, determine the value of virtual negative inductance required for accurate reactive power sharing , realize the virtual impedance in the virtual controller, feed back the voltage drop of the virtual controller to the droop controller, and participate in the fractional-order PID tracking control of the virtual power supply voltage; use the fractional-order PID to track the inverter voltage in the voltage / current dual-loop controller Control, according to the transfer function of the filter to determine the filter parameters in the controller, using the differential genetic algorithm to optimize the parameters of the fractional order PID controller. The invention can ensure the power decoupling of the low-voltage micro-grid and improve the effect of equal sharing of reactive power.

A low pass filter includes a first inductor, a second inductor magnetic-field-coupled to the first inductor, a third inductor, and a first capacitor. The first inductor is electrically connected between a first port and an intermediate node, being a node to which the second inductor is electrically connected, between the first inductor and the second port. The second inductor is electrically connected between the intermediate node and a ground terminal. The third inductor is electrically connected between the intermediate node and the second port, and a first parallel resonant circuit is defined by the third inductor and the first capacitor. The first inductor and the second inductor are coupled to each other in such a relationship that a negative inductance is generated between the intermediate node and the third inductor due to magnetic field coupling between the first inductor and the second inductor.

The present application discloses a rectifier and a control method and control system thereof, including: determining an error between a DC voltage output by the rectifier and a DC reference voltage, and determining an expected resistance value to be simulated at a port of the rectifier based on the error; The grid current at the input end and the simulated harmonic impedance determine the harmonic compensation voltage for compensating harmonics; through the estimated value of the equivalent inductance of the rectifier, determine the simulated negative inductance of the rectifier port, and determine the negative inductance through the negative inductance. The inductance voltage drop compensation value used to compensate the inductance voltage drop of the rectifier; according to the expected resistance value, harmonic compensation voltage and inductance voltage drop compensation value, determine the current required voltage reference value of the rectifier port to modulate the PWM pulse and carry out Drive control of the rectifier. By applying the solution of the present application, when there is no grid voltage sensor, the current harmonics of the rectifier are effectively reduced, and a high power factor is achieved.

The invention provides an inverter control method without a grid voltage sensor. The inverter control method includes two parts: analog negative resistance control and stabilization control based on analog negative inductance. The analog negative resistance control is used to realize the power transmission of the inverter to the grid while ensuring that the output current of the inverter remains sinusoidal. The stabilization control based on the analog negative inductance is used to make up for the unstable pole caused by the analog negative resistance control, so as to realize the safe and stable operation of the inverter. In addition, this method only samples the output current of the inverter, which improves the reliability of the system and reduces the sensor cost. At the same time, the method is simple to control and has a small amount of calculation, so it is suitable for practical applications.

The invention provides a low-voltage micro-grid distributed control method and system based on adaptive virtual impedance. The method comprises the following steps: generating adaptive virtual resistance by using a product of a ratio of active power output by a local inverter and voltage magnitude and a virtual impedance coefficient; determining virtual negative inductance according to an inductive reactance part of equivalent output impedance of the local inverter, so that the equivalent output impedance of the local inverter has a resistance property; obtaining the adaptive virtual impedanceaccording to the complex accumulation of the adaptive virtual resistance and the virtual negative inductance; according to a dq-axis current component of the adaptive virtual impedance and local inverter outlet three-phase current, generating dq-axis virtual voltage; and using the dq-axis virtual voltage to compensate a voltage reference value obtained by resistance droop control to obtain finalreference voltage.

A power supply according to the present disclosure includes: a step-down circuit which has at least one pair of positive / negative step-down switching elements; at least one pair of positive / negative inductors to which voltage is applied via the step-down switching element, and one pair of positive / negative output capacitors which are connected in series and charged by electrical current passing through the inductor, and steps down input voltage and then outputs; an inverse-conversion circuit which has a plurality of inverse-conversion switching elements, and inverse-converts output voltage of the step-down circuit into alternating current; and a control circuit which controls switching of the plurality of step-down switching elements so that the output voltage of the step-down circuit becomes a desired voltage.