153 results about "High input" patented technology

Technologies are provided to calculate a logarithm of an input current to a logarithmic transimpedance amplifier device at a particular temperature. The logarithm of the current is calculated in digital domain based on sampling of analog signals that are internal to the logarithmic transimpedance amplifier device. The sampling can be performed, in some cases, by an analog-to-digital converter device integrated into the logarithmic transimpedance amplifier device. The calculation in digital domain is performed by one or more processor external to the logarithmic transimpedance amplifier device. The calculation includes a determination of a temperature compensation factor based on an internal analog signal indicative of temperature of the logarithmic transimpedance amplifier device. The temperature compensation factor permits removing temperature dependence from a logarithmic output voltage originating from the input current. Operating in the digital domain permits applying corrections that account for residual leakage current and an emitter-resistance correction at high input currents.

The invention relates to an anti-radiation D flip-flop based on interconnection line crosstalk calculation. The anti-radiation D flip-flop comprises a cascade structure of a master latch module and a slave latch module, the primary latch module converts an input signal into a dual-node redundant signal through a first interconnection line crosstalk circuit (CC1), and logic storage of triggering high output only by dual high input is realized by capacitive coupling of L1-L3 and L2-L3; the slave latch module generates redundant signals L4 / L5 through a second interconnection line crosstalk circuit, and error correction is carried out on CC2 output and direct transmission signals in combination with a Muller C unit. The D flip-flop only needs 16 transistors with the minimum size, and the number of the transistors is reduced by 67% compared with that of a traditional TMR; asynchronous reset is supported, and the L3 / L6 is forced to be charged to a high level during reset; the capacitive coupling strength is controlled through metal layer wiring, and the reliability of a spaceflight electronic system in a radiation environment is remarkably improved.

The low-frequency electromagnetic wave has the characteristics of high penetrability and low signal attenuation, and can be widely applied to the fields of underground communication, underwater communication and the like. Most existing low-frequency transmitting antennas are electrically small antennas, have the problems of large size, complex equipment, short transmission distance and the like, and are difficult to meet actual requirements. The invention relates to a high-power pulse low-frequency antenna based on a Tesla coil. The high-power pulse low-frequency antenna is a high-power pulse transmitting antenna composed of a solid-state double-resonance Tesla circuit, a transformer, a primary coil and a secondary coil. The antenna adopts a high-voltage pulse generated by a Tesla circuit for feeding, and meanwhile, a transformer type impedance matching network is combined, so that the feed power is maximized. The radiation coil selects a primary and secondary nested coupling structure, the working frequency is accurately adjusted to be the output frequency of the Tesla circuit by respectively connecting resonant capacitors in series to the primary and secondary coils, and effective amplification of radiation signals is realized based on a magnetic coupling effect. The size of the coil is in the sub-cubic meter level and is within one thousandth of the working wavelength. Aiming at the antenna design difficulty in long-wave communication, the antenna has the advantages of high input power, long-distance transmission and small physical size, and has potential application value in the fields of cross-medium communication, emergency management communication and the like.

A voltage selector includes a first input terminal for receiving a first input voltage, a second input terminal for receiving a second input voltage, an output terminal, a main select circuit and a reference circuit. The main select circuit includes a select unit for outputting a higher input voltage as an output voltage to the output terminal, and an auxiliary unit for pulling up the output voltage to the first input voltage according to a reference voltage when the first input voltage equals to the second input voltage. The reference circuit pulls up the reference voltage according to a higher one of the first input voltage and the second input voltage, and pulls down the reference voltage when the first input voltage equals to the second input voltage and the output voltage is lower than the first input voltage by a threshold voltage.

The invention relates to the technical field of power management, in particular to an LDO (low dropout regulator) circuit with a wide input voltage range, which comprises a pre-voltage-stabilizing module, a band-gap reference module, an error amplification module, a voltage-stabilizing control module and a power tube, the pre-voltage-stabilizing module is used for preprocessing a wide-range input voltage into a stable low power supply voltage; the band-gap reference module is used for converting the low power supply voltage into a reference voltage; the error amplification module is used for amplifying the difference value between the reference voltage and the feedback voltage of the output circuit into a high-gain and low-noise control signal; the control signal drives the power tube after being compensated and buffered by the voltage stabilization control module, and the power tube converts the wide input voltage into an LDO output signal. Only one LDO main body circuit is adopted, the wide input voltage range can be achieved, high input voltage can be adapted, low input voltage can also be adapted, the use number of components of an LDO chip is reduced, and the occupied area of the chip is greatly reduced.

The utility model relates to the technical field of power electronics, in particular to a power circuit for an electrostatic probe system and the electrostatic probe system.The electrostatic probe system comprises an electrostatic probe, an electrostatic probe driving device and the power circuit, and the power circuit comprises a plurality of DC / DC converters which are input in parallel and output in series; the power supply is connected between the power supply and the electrostatic probe driving device; a higher input current requirement is met through parallel input, and low-voltage input and high-voltage output are realized through a series output mode so as to meet a high-voltage requirement required by an electrostatic probe system. And the plurality of time delay circuits are in one-to-one correspondence with the plurality of DC / DC converters, the input ends of the time delay circuits are connected to a power supply, the output ends of the time delay circuits are respectively connected to the time delay enabling ends of the DC / DC converters, and the time delay circuits are used for carrying out peak shifting starting on the plurality of DC / DC converters. Stable starting of the power supply circuit is ensured, and large current impact generated by parallel input is prevented.

A novel frequency tunable bi-directional phased array processing consisting of variable phase shifting and amplitude adjustment which employs a vector modulator and active combiner and splitter is proposed. Advantages of the proposed bi-directional a phased array processing includes the following 1) compact size; 2) high efficiency; 3) reduced passive trace loss and power consumption; 4) active current combining; 5) high input-output isolation; 6) high resolution and precise gain control and unequal combining or splitting; 7) phase-invariant amplifier design; 8) high accuracy and high-resolution phase shifter; 9) frequency tunability, within a small frequency range and / or a large frequency range; and 10) optimal unequal combining or splitting.

Embodiments herein describe a voltage regulator with at least one power stage (or phase) that includes circuitry for providing an efficiency mode for low power situations. For example, when an output voltage and current of the power stage is below a threshold, the voltage regulator can switch to the efficiency mode (e.g., a high efficiency mode (HEM)). When in the efficiency mode, the power stage can use a first, lower input voltage to perform pulse width modulation (PWM). However, when in a high power mode, the power stage can use a second, higher input voltage to PWM. For example, the power stage can include one or more switches for switching between the first and second input voltages to use in the different modes of operation.

A lavalier microphone has improved dynamic range. The lavalier microphone incorporates a pair of microphone transducer elements into the same housing or attached housings, with one of the microphone transducer elements being more sensitive to acoustic input than the other. The voltage signals from the respective transducer elements are processed and combined, resulting in a digital output audio signal with improved signal to noise both at lower and higher input acoustic levels.

The invention discloses a reconfigurable charge pump circuit applied to a radio frequency energy acquisition system. The reconfigurable charge pump circuit comprises a charge pump clock generation module, a multi-stage charge pump, a field effect transistor switch module, an intermediate node voltage detection module and an output voltage stabilization module, dC voltages of the radio frequency rectifier under different input power conditions are received, the DC voltages are boosted into output signals of the multi-stage charge pump through the multi-stage charge pump, and power is supplied to subsequent loads through the output voltage stabilization module; the intermediate node voltage detection module detects the node voltage between the first two stages of charge pumps and the second two stages of charge pumps, and generates different enable signals to control the field effect transistor switch module according to whether the node voltage exceeds a threshold value or not, so that switching of the charge pumps in different working stages is realized, and reconfiguration is realized. According to the invention, stable output voltage can be obtained under the conditions of low input voltage and high input voltage, good output performance is shown, and the circuit is very suitable for the condition of input power fluctuation of a radio frequency energy acquisition system.

This invention relates to the field of pulse circuit technology and discloses a high-efficiency AC power line zero-crossing detection chip, including a path selection module, a signal processing module, and a driving module. The path selection module switches the charging circuit according to the potential of the internal power supply capacitor. The signal processing module uses a feedback loop to adjust the switching level of the sampling branch and generate a zero-crossing trigger pulse signal. The driving module responds to the zero-crossing trigger pulse signal by segmentally turning on the internal power supply capacitor and the external energy supply capacitor in the initial and subsequent stages of the zero-crossing point. This invention solves the contradiction between the ultra-high input impedance sampling environment and the driving strength through a controlled hysteresis window and a segmented current injection mechanism, suppresses signal jitter, improves the timing accuracy of zero-crossing detection, and effectively reduces the static power consumption of the system.

The air conditioner comprises a refrigerant circulation loop, a condensation temperature sensor, a PFC circuit and a controller, and the controller is configured to obtain the current effective value, the voltage peak value, the condensation temperature, the compressor operation frequency and the actual bus voltage value of alternating current input voltage; determining a bus coefficient according to the current effective value and the voltage peak value, or determining a target coefficient according to the current effective value, the voltage peak value, the condensation temperature and the compressor operation frequency; determining a target bus voltage value according to the product of the voltage peak value and the target coefficient; and generating a voltage control instruction according to the target bus voltage value and the actual bus voltage value, and outputting the voltage control instruction to the PFC circuit, so that the PFC circuit controls the on-off state of an internal switching tube based on the voltage control instruction, and the actual bus voltage value reaches the target bus voltage value. The overhigh bus voltage caused by the adoption of the fixed bus voltage under the condition of light load or high input voltage is avoided, and unnecessary switching loss is inhibited.

The utility model provides an auxiliary power supply starting circuit with high input voltage, a switching power supply and electronic equipment. The circuit comprises a pre-starting circuit and a pre-charging circuit, the pre-charging circuit comprises a constant current charging circuit, an energy storage circuit and a protection circuit. The constant current charging circuit comprises a first NMOS tube and a first resistor. The input end of the pre-starting circuit is electrically connected with an input power supply, and the output end is electrically connected with the input end of the protection circuit; a first output end of the protection circuit is electrically connected with a grid electrode of the first NMOS tube, and a second output end of the protection circuit is electrically connected with a second end of the first resistor; the drain electrode of the first NMOS tube is electrically connected with an input power supply, and the source electrode is electrically connected with the first end of the first resistor; the first end of the energy storage circuit is electrically connected with the second end of the first resistor and the power supply end of the power supply control chip, and the second end is grounded. According to the auxiliary power supply starting circuit with the high input voltage, the constant-current charging circuit can be started through the pre-starting circuit to charge the energy storage circuit, and rapid starting of the auxiliary power supply is achieved.

The utility model discloses a charging and downloading integrated cabinet and a seismic exploration system, and belongs to the field of seismic exploration. The charging and downloading integrated cabinet comprises a signal source assembly and a plurality of interface circuit boards. Each interface circuit board is provided with a voltage following circuit, and the voltage following circuits are connected between the signal interface end of the signal source assembly and the seismic exploration node instrument. The voltage follower circuit has the characteristics of high input impedance and low output impedance, so that under the action of the voltage follower circuit, the acquisition test signal sent by the signal source assembly can be normally transmitted to the seismic exploration node instrument through the voltage follower circuit; in addition, it can be ensured that the abnormal voltage of the circuit station does not affect the signal source assembly, so that the signal source assembly can send a normal acquisition test signal to perform acquisition index test on other normal seismic exploration node instruments.

This application discloses a multi-inductor multi-output DC-DC voltage converter and its control method. The converter includes several basic unit modules and a charge redistribution module. The basic unit modules are connected in series and all are connected to the charge redistribution module. The method includes: based on the input voltage signal, and using the basic unit modules, sequentially and alternately magnetizing and demagnetizing a first inductor within a complete cycle to obtain the load-side output current and load-side output voltage; obtaining the first flying capacitor current and combining it with the load-side output current and load-side output voltage; and adjusting the inductor current based on the charge redistribution module to output the adjusted inductor current. The embodiments of this application enhance the ability to support higher input voltages and more output channels while reducing external components, thereby improving system conversion efficiency. This application can be widely applied to integrated circuit design technology.

The invention discloses a wide dynamic range rectifier based on an automatic power distribution mechanism. The wide dynamic range rectifier comprises a high-power sub-rectifier and a low-power sub-rectifier, the high-power sub-rectifier comprises a high-power rectification trunk and a high-power rectification branch; the low-power sub-rectifier comprises a low-power rectification trunk and a low-power rectification branch; through the synergistic effect of a threshold switch control circuit and a tunable matching network arranged in a low-power rectification branch, the low-power rectification branch provides inductive impedance in a low-power state to compensate the inherent capacitive impedance of a low-power rectification diode, and presents a high-impedance state in a high-power state to turn off a low-power sub-rectifier. Therefore, the adverse effect of the low-power sub-rectifiers on the high-power sub-rectifiers is avoided while high-efficiency energy conversion in the low-power interval is ensured, and the overall rectification efficiency in the high-input power interval is remarkably improved.

This invention belongs to the field of random number generator technology, and relates to a true random number generator based on volatile memristors and a method for fabricating memristors. The method includes an entropy generation unit and a bit extraction unit. The entropy generation unit includes two or more volatile memristors connected in parallel, one end of which is connected to the input voltage, and the other end is connected in series with a load resistor and then grounded. The entropy generation unit exhibits spontaneous bistable switching behavior under high input voltage. The bit extraction unit includes a T flip-flop connected between the load resistor and the parallel volatile memristors, used to sample oscillation signals and generate a usable random bit stream. Its advantages are that it simplifies the circuit structure of the true random number generator, achieves a high random bit generation rate, and achieves extremely high energy efficiency.

The invention discloses a driving-stage power supply circuit, a control method and a switching power supply. The circuit comprises a bias current module, a sampling module, a current-to-voltage conversion module, a high-input-voltage power supply module and a low-input-voltage power supply module. And switching the low input voltage power supply module or the high input voltage power supply module to work according to the input voltage of the input end of the driving stage power supply circuit and a preset threshold voltage. The area of a switching tube in the high-input-voltage power supply module can be greatly reduced by adjusting the reference voltage through the sampling module, so that the chip cost is reduced, the switching of power supply modes can be realized by switching the low-input-voltage power supply module or the high-input-voltage power supply module, the wide input voltage range is finally realized, and the power supply efficiency is improved. The invention discloses a power supply structure with fast load transient response.

The invention relates to a high input impedance low power ADC. An electronic system is disclosed. An electronic system includes: an input transistor having a source configured to receive an analog input signal; a filter having an input coupled to an output node of the input transistor; an ADC having an input coupled to the output of the filter and an output configured to provide a digital signal representing an analog input signal; and a DAC having an input coupled to the output of the ADC and an output configured to provide a current to the source of the input transistor.

This invention discloses a voltage regulator circuit based on current feedback; it includes a sampling module, an adjustment module, and a feedback control module, specifically including high-voltage MOSFETs HV_PM1, HV_PM2, HV_PM3, and HV_NM1, constant-voltage MOSFETs NM1, NM2, NM3, and NM4, a Zener diode Z1, resistors R0, R1, and R3, and bias currents I1, I2, and I3. This invention operates when the input voltage is lower than the reverse breakdown voltage V of the Zener diode Z1. Z1 When the input voltage is high, the output voltage equals the input voltage, resulting in a small voltage drop. At high input voltages, the current flowing through the Zener diode Z1 is sampled, and the gate-source voltage difference of the MOSFET is adjusted via a feedback loop. This changes the on-resistance of the MOSFET, stabilizing the output voltage VOUT at the reverse breakdown voltage V0 of the Zener diode Z1. Z1 Approximately 5.5V.

The present application relates to the technical field of wireless communication networks, and provides a low-channel EEG amplification circuit and a brain-computer interface device for behind-the-ear EEG signals, comprising: a dry electrode sensing module for acquiring EEG signals; a pre-active amplifier module comprising an operational amplifier circuit with high input impedance; an anti-aliasing filter module composed of a multi-order passive filter network and an active filter circuit in cascade, connected to the output end of the pre-active amplifier module, for filtering out high-frequency interference signals; a right leg drive feedback module comprising a programmable impedance adjustment circuit and a current limiting protection circuit, forming a closed-loop feedback loop with the pre-active amplifier module, and the output end of the right leg drive feedback module forming a current loop with the human body through a protective resistor; an analog-to-digital conversion module using an integrated low-power analog front-end chip; a wireless transmission module; and a power management module providing independent power supply to the analog front-end chip, the operational amplifier circuit, and the wireless transmission module.

The invention provides a high-voltage comparator, a chip and electronic equipment. The high-voltage comparator comprises a first PMOS tube, a second PMOS tube, a first current source, a clamping circuit and a load circuit, and the clamping circuit receives high-voltage power supply and is connected with the positive phase input end of the high-voltage comparator, the negative phase input end of the high-voltage comparator, the source electrode of the first PMOS tube and the source electrode of the second PMOS tube. The drain electrode of the first PMOS transistor and the drain electrode of the second PMOS transistor are connected with a load circuit so as to output a comparison result signal. The clamping circuit is configured to work when the voltage difference of input signals of the positive phase input end and the negative phase input end exceeds a preset voltage threshold value so as to enable the gate-source voltage of the first PMOS tube and the gate-source voltage of the second PMOS tube to be within a safe range. The invention has the advantages of high input impedance, support of high-voltage wide input range, simple structure, small consumption area, high comparison speed, no need of parasitic diode and the like.

The utility model relates to a laser receiving circuit for a laser communication system. The laser receiving circuit comprises a photodiode PD, a current mirror circuit, an operational amplifier module U1, a limiting amplifier module U2 and a voltage follower circuit, the photodiode PD, the current mirror circuit, the operational amplifier module U1 and the limiting amplifier module U2 are sequentially connected in series, and the voltage follower circuit is arranged at a third interface of the limiting amplifier module U2. The current mirror circuit provided by the utility model has the characteristics of high input impedance and low output impedance, and enhances the stability and consistency of current signals, thereby reducing the introduction of noise. And subsequent amplitude limiting amplification is carried out to ensure the high-frequency transmission quality of the signal. The utility model has the characteristics of high sensitivity, low noise, high signal amplification precision and the like, and is suitable for a high-speed optical communication system.

Various methods and circuits are presented for protecting a power amplifier (PA) from high input power. In one aspect, a protection circuit connected to a stage of the PA limits a current through the stage during high input power conditions. The current is limited by a current limiting circuit including a current generator connected to a current mirror. The current is limited to a high value based on a reference current generated by the current generator. In one aspect, the reference current is programmable or variable. In another aspect, the protection circuit includes a clamp that limits a low voltage at an output of the current limiting circuit. In another aspect, the protection circuit includes a precharge circuit that precharges the output of the current limiting circuit. In another aspect, a filter is embedded in the current limiting circuit.

The present invention relates to an electromagnetic pulse measurement device and method, and specifically to a magnetic field probe and electromagnetic pulse measurement method for electromagnetic pulse measurement. The method solves the technical problems that existing magnetic field probes are susceptible to interference, the differential signal output after integration has errors with the original signal, the secondary numerical integration calculation is inconvenient, or the method is not suitable for measuring fast-front pulse magnetic field signals. The magnetic field probe for electromagnetic pulse measurement provided by the present invention includes a coaxial cable with a gap, a shielding shell, and an integration circuit, a high input impedance amplifier circuit, and an electro-optical conversion circuit arranged in the shielding shell and connected in sequence. The output signal of the magnetic field probe is the original signal of the magnetic field waveform, avoiding the need for numerical integration to restore the magnetic field waveform to be measured in differential measurement. The coaxial cable with a gap is semicircular and includes an inner core and a shielding layer. An annular gap is provided circumferentially on the upper surface of the shielding layer. The two ends of the inner core are respectively connected to the integration circuit and a load resistor, and the method has a strong ability to resist electric field interference.

The invention provides an electricity storage device and method and a storage medium, and relates to the technical field of energy storage. The power storage device comprises an input power supply module, a central control module, a power storage module and a load module. The input power supply module is used for accessing an external power supply; the central control module is used for performing power judgment on the external power supply to obtain a power judgment result; the power storage module is used for carrying out storage and power conversion on the input electric energy provided by the external power supply according to the power judgment result to obtain power supply electric energy for supplying power to a load by output power; and the load module is used for consuming the power supply electric energy according to the output power. According to the invention, the problems of high input power demand and poor power supply electric energy quality of the existing power storage device are effectively solved.

The adaptive multi-mode PWM controller comprises a control core, a clock circuit, a PWM signal generation circuit, a feedback circuit, a power supply circuit, a protection circuit, a multi-mode circuit and a communication interface circuit, by setting a multi-mode circuit, the integrated circuit works in a QR mode of high input voltage under a normal load condition, works in a PFM mode and performs valley bottom switching to improve efficiency when the load is reduced, and works in a fixed frequency CCM mode under a low line input voltage when the integrated circuit is in a heavy load, so that higher conversion efficiency can be obtained in a whole load range. The off-line flyback converter is applicable to off-line flyback converters with high performance, low standby power consumption and low cost.

The invention discloses a broadband amplitude limiting module with low reflection after overvoltage. The broadband amplitude limiting module comprises an impedance matching circuit, a high-input impedance amplifying circuit and a low-frequency gain control circuit, wherein the impedance matching circuit is used for performing 50 omega termination matching between an input signal and the high input impedance amplification circuit, and in the high input impedance amplification circuit, a low and medium frequency signal fed back by the low frequency gain control circuit and a high frequency signal coupled by the high frequency coupling capacitor are synthesized and then input to the differential operation amplification circuit; therefore, the problem of reflection caused by overvoltage in the circuit is solved, and the waveform quality of a signal path is ensured.

The invention provides a hydraulic servo valve control system which comprises a single chip microcomputer used for conducting steady state control on the operation process of hydraulic equipment. The power supply voltage reduction module is used for connecting an external power supply and providing a stabilized power supply for system work; the servo valve output module is electrically connected with the single-chip microcomputer, and the AD sampling module is electrically connected with the single-chip microcomputer and used for preventing the single-chip microcomputer from being burnt due to too high input voltage; and the 485 communication module is connected with the single chip microcomputer and is used for receiving and sending data. Based on the STM32F030 single-chip microcomputer, digital quantity PI calculation real-time control is adopted, a traditional analog quantity control mode is replaced, remote communication is achieved through the 485 communication module, networking control can be achieved, and the system is more intelligent and user-friendly.

This invention relates to a biomedical front-end detection circuit with duty cycle adjustable positive feedback capacitor and a method for fixing the capacitance value of the positive feedback capacitor. The circuit includes a duty cycle adjustment signal generator, a fully differential gain circuit, a positive feedback capacitor loop, and a low-pass filter. The fully differential gain circuit amplifies physiological signals. The positive feedback capacitor loop is an array of positive feedback capacitors connected to the fully differential gain circuit, and the positive feedback capacitor array includes a high-order positive feedback capacitor and a low-order feedback capacitor. The low-pass filter circuit filters the high-frequency biological signals output by the fully differential gain circuit. The duty cycle adjustment signal generator generates a duty cycle adjustment signal and continuously adjusts the low-order feedback capacitor to generate the minimum equivalent capacitance value. The beneficial effect is that by adjusting the duty cycle of the positive feedback capacitor to obtain an adjustable minimum capacitance value, high gain and high input impedance calibration resolution are achieved.