11 results about "Phase reversal" patented technology

The invention discloses an audio amplification system based on phase reversal double-class-D power amplifier low power stress. The audio amplification system comprises a signal receiving and decoding module, an operational amplifier module, a double-group class-D power amplifier module, a filtering output module and a power supply module for supplying power to each module, which are connected with one another, a first operational amplifier unit in the operational amplifier module is configured to perform in-phase amplification on the analog audio signal; the second operational amplifier unit is configured to perform inverting amplification on the input signal; a first D-type power amplifier unit in a double-group D-type power amplifier module receives an in-phase signal and outputs an in-phase PWM (Pulse Width Modulation) power signal, and a second D-type power amplifier unit receives an inverted signal and outputs an inverted PWM power signal; and the first D-type power amplifier unit and the second D-type power amplifier unit work based on driving signals with opposite phases, so that peak current drawn from the power supply module is staggered or complementary in time to reduce instantaneous current stress and voltage fluctuation of the power supply module. The same audio output power is realized through ingenious signal phase management on the premise that the power supply cost is not increased or even reduced.

The present invention provides a single-phase grounding fault detection system and method for a distribution network. The system comprises: two synchronous signal sources, one at each end of a fault line, which simultaneously and synchronously inject a high-voltage signal with a completely identical voltage waveform into the fault line at both ends of the fault phase under GNSS time reference control; because the current reference direction is from one signal source toward the other, the current phases of the fault lines on both sides of the fault point are opposite; and a synchronous detector, which determines the grounding fault point by detecting the current phase reversal point on the fault line under GNSS time reference control. The single-phase grounding fault detection system and method for a distribution network provided by the present invention can effectively solve the problem of difficulty in determining the amplitude detection threshold and frequent misjudgments in existing detection processes.

The invention discloses a high-voltage power-on reset circuit, and the circuit comprises a band-gap reference module which generates a preset reference voltage; the sampling module is used for sampling power supply voltage and outputting a power-on reset signal; the phase reversal module is used for performing phase reversal processing on the sampling voltage and outputting a phase reversal power-on reset signal; the comparator is used for comparing a preset reference voltage with the reverse-phase power-on reset signal and outputting a power-on reset control signal; and the power-on reset module outputs a reset signal under the control of the power-on reset control signal so as to complete power-on reset. The comparator is used for comparing the preset reference voltage with the anti-phase power-on reset signal and outputting the power-on reset control signal to control the power-on reset module to complete power-on reset; a voltage-limiting diode is added to a gate-source electrode of a high-voltage MOS tube in the power-on reset module, and positive and negative electrode voltages of the diode are controlled to protect the high-voltage MOS tube; the high-voltage power-on reset circuit is simple in structure and small in occupied chip area.

The embodiment of the invention provides an inversion suppression circuit and an operational amplifier. The inversion suppression circuit comprises an inversion decision circuit which is connected with the operational amplifier input stage and is used for comparing an operational amplifier input signal with the ground and outputting a first control signal and a second control signal; when the positive phase input signal of the operational amplifier is smaller than the ground, the first control signal is a first logic level, and the second control signal is a second logic level. When the negative phase input signal of the operational amplifier is smaller than the ground, the second control signal is the first logic level and the first control signal is the second logic level. According to the invention, the phase inversion suppression effect is improved.

The embodiment of the invention provides an operational amplifier phase inversion suppression circuit which comprises a comparison module and a phase control module, the input end of the comparison module is used for being connected with the normal-phase input voltage and the inverted-phase input voltage of an operational amplifier, and when the normal-phase input voltage is smaller than the detection voltage, the phase control module is used for controlling the phase inversion of the operational amplifier. The comparison module outputs a first comparison signal; when the inverted input voltage is smaller than the detection voltage, the comparison module outputs a second comparison signal; the input end of the phase control module is used for being connected with the output end of the comparison module, the output end of the phase control module is connected with a target port of the operational amplifier, and when the phase control module receives the first comparison signal, a first control signal is output to the target port; controlling the output end of the operational amplifier to keep low level; and when the phase control module receives the second comparison signal, a second control signal is output to the target port, and the output end of the operational amplifier is controlled to keep high level. The phase reversal suppression effect of the operational amplifier is achieved.

The invention discloses a phase-reconfigurable ultra-wideband three-dimensional frequency selective surface and application, and belongs to the technical field of reconfigurable frequency selective surfaces, the surface comprises M columns of units, and N units in each column are simultaneously controlled by a signal provided by an external control circuit; each basic unit comprises a slot line layer, an Ro4003C dielectric layer, a microstrip line layer and a metal through hole used for energy transmission between the slot line layer and the microstrip line layer. The Pin diodes are introduced between the slot line rings on the slot line layer to serve as reconfigurable devices, symmetrical phase reversal of current is achieved, 1-Bit regulation and control are conducted on the phase of transmission waves, control is accurate, and the switching speed is high. According to the invention, ultra-wideband frequency selection can be realized for incident electromagnetic waves with an incident angle in a range of 0-60 degrees, two working states with a phase difference of 180 degrees are realized in a passband, and meanwhile, the ultra-wideband frequency selection filter has the advantages of low insertion loss and high phase precision, and can be widely applied to dynamic regulation and control of space electromagnetic waves of a new-generation radio subsystem.

This invention discloses a method and system for metering unsteady-state harmonic energy based on dynamic mirror extension, relating to the field of energy metering technology. The method extracts the instantaneous frequency of the unsteady-state harmonic signal through Hilbert transform, calculates the optimal reversal point spacing, and sets reversal points only at integer multiples of the optimal reversal point spacing. This solves the problem of phase reversal point distortion caused by the frequency variation of unsteady-state harmonic extrema in traditional mirror extension, effectively suppressing the endpoint effect, improving the signal-to-noise ratio of the extension segment, and enhancing the accuracy of energy metering.

The invention provides a current register and a control method thereof, and an image sensor, and the current register comprises a transmission module which is used for obtaining a signal current; the operation register module comprises a first register transistor, a second register transistor and a switch control unit; by controlling the state of the switch control unit, the first register transistor and the second register transistor perform phase inversion, addition, subtraction or multiplication on the signal current to obtain a result current, and the result current is stored. According to the invention, through only one operation register module, phase reversal, addition, subtraction and accumulation operations can be realized, and positive and negative currents can be stored, so that the circuit complexity is greatly reduced while the operation function is ensured, the circuit area consumption is further reduced, the integration level is improved, the hardware cost is saved, and the cost is reduced. The problem that an existing current register is large in area overhead is solved.

The invention discloses an audio differential output method and device and electronic equipment. The method comprises the following steps: receiving dual-channel audio data, wherein the dual-channel audio data comprises first channel data and second channel data; performing sound mixing processing on the first sound channel data and the second sound channel data to generate a target signal; performing phase reversal processing on the target signal to obtain a phase reversal signal of the target signal; outputting a target signal to a first sound channel output port of an audio codec, and outputting the inverted signal to a second sound channel output port of the audio codec; and performing audio output in a differential mode based on the target signal and the inverted signal through a load electrically coupled between the first channel output port and the second channel output port. In the invention, through a pure software processing mode, a differential output function is realized on the audio codec which only supports single-ended output, and extra hardware cost is reduced.

The invention discloses a sensor and method for removing strong electromagnetic noise interference based on traveling wave directivity, and belongs to the technical field of partial discharge signal detection. According to the method for removing the strong electromagnetic noise interference based on the traveling wave directivity, the first electric field signal and the first magnetic field signal are obtained through filtering, the first magnetic field signal is expanded according to the preset proportion and then subjected to phase reversal, the second magnetic field signal is obtained, and finally the second magnetic field signal and the first electric field signal are superposed. The problem that partial discharge signals are submerged due to strong electromagnetic noise interference is ingeniously solved, the detection performance in a complex electromagnetic environment is improved, partial discharge detection in the strong electromagnetic noise interference environment can be achieved, weak partial discharge signals can be extracted in an auxiliary mode, and the implementation mode is simple and efficient.

Amplifier, comprising: a bootstrap circuit (210) for improving the linearity of the amplifier; and a feedforward control circuit (216) for modifying a voltage of the bootstrap circuit in response to a change in an input signal, the feedforward control circuit comprising a capacitor (218), wherein modifying the voltage prevents a phase reversal condition of the amplifier by forward biasing a collector-base junction of an input transistor (212), wherein the pre-control circuit (216) comprises a plurality of diodes (224, 226) that cooperate with the capacitor (218) to maintain the base-collector voltage of the input transistor (212).