179 results about "External resistor" patented technology

The invention relates to the technical field of current signal processing, and discloses a bidirectional current detection method for a POWER tube, and the method comprises the steps: carrying out the signal processing of a bidirectional current signal of the POWER tube through a POWER detection part and a common-mode component current conversion unit, and obtaining a POWER detection signal and a common-mode component signal; a POWER detection signal is processed through a detection signal processing module to obtain a conversion current signal, the conversion current signal and a common-mode component signal are subjected to differential synthesis through a differential current synthesis unit to generate a feedback current signal, and the feedback current signal is transmitted to an external resistor Rext to generate a mapping voltage signal. According to the method, the bidirectional current signal of the POWER tube can be accurately detected, the voltage signal in proportion to the intensity of the current signal is generated, the accuracy and stability of the signal are improved through differential synthesis processing, intensity display of the current signal of the POWER tube is achieved, and the problem that in the prior art, the cost is high due to the fact that an external resistor is adopted for detecting a circuit is solved.

The invention discloses a sensor array acquisition system for detecting gas, and relates to the field of gas sensors. The sensor array acquisition system for detecting gas comprises a gas sensor array, a signal conditioning circuit, an analog-to-digital conversion module, a control module and a power supply module. According to the sensor array acquisition system for detecting the gas, the voltage follower circuit with high input impedance is adopted, so that the problem of attenuation during signal acquisition of a high-impedance sensor is effectively solved, and the signal acquisition precision is improved. Through the adjustable direct-current bias circuit and the differential amplification circuit, the dynamic adjustment of the measurement range is realized, the gas detection requirements of different concentration ranges can be met, and hardware does not need to be replaced. A constant-current driving chip is adopted to control a sensor heating circuit, heating current can be accurately set by adjusting external resistance, it is ensured that the sensor works at the optimal temperature, and the stability and response speed of the sensor are improved.

A semiconductor memory device includes an external resistor in a board, and a plurality of memory dies mounted on the board and that are designated as a master die and slave dies. The memory dies are commonly connected to the external resistor. The master die performs a first impedance calibration operation and outputs a first done signal indicating completion of the first impedance calibration operation to the slave dies through a first impedance pad. Each of the slave dies includes a second impedance pad, and receives the first done signal through the second impedance pad, generates an identification signal based on the first done signal, performs a second impedance calibration operation sequentially with respect to the other slave dies based on the identification signal, and outputs a second done signal indicating completion of the second impedance calibration operation through the second impedance pad.

The invention discloses a sediment microbial fuel cell sensor and method for monitoring methane emission. The sediment microbial fuel cell sensor comprises an anode, an external resistor, a reference electrode, a reference electrode chamber, a data collector and a monitoring terminal, the anode is buried in wetland bottom mud and is connected in series with the external resistor and the reference electrode; the reference electrode chamber floats in overlying water of wetland bottom mud, the reference electrode chamber is of a hollow cylindrical structure with an open bottom and a sealed top, the bottom of the reference electrode chamber is isolated from the overlying water by adopting a proton exchange membrane, an electrolyte solution is filled in the reference electrode chamber, and the reference electrode penetrates through the top of the reference electrode chamber and is inserted into the electrolyte solution; the external resistor is connected in parallel with a data collector, and the data collector sends collected electric signals to a monitoring terminal. Based on existing researches, the number of electrogenic bacteria in soil and the number of methanogens are found to have high correlation, so that the voltage of the sediment microbial fuel cell can be used as a monitoring index for monitoring the methane emission flux of the methanogens.

The invention provides a low-trigger and high-maintenance silicon controlled rectifier and a manufacturing method thereof. A first N + injection region and a first P + injection region are arranged in a first N well, a third N + injection region and a second P + injection region are arranged in a first P well, and the second N + injection region is arranged between the first N well and the first P well; three electrodes corresponding to the first N + injection region, the first P + injection region and the second N + injection region are connected together to form a silicon controlled rectifier anode, and two electrodes corresponding to the third N + injection region and the second P + injection region are connected together to form a silicon controlled rectifier cathode; the first grid electrode is arranged on the surface of the first P well and connected with the cathode of the silicon controlled rectifier through an external resistor. And the external resistor, the second N + injection region and the side capacitor of the grid form an RC path, so that the effects of reducing the trigger voltage and improving the maintaining voltage are achieved.

A first impedance calibration part configured to perform a first impedance calibration operation of generating a first impedance calibration code set for adjusting an impedance of a first terminating resistor to a first target value, with reference to an external resistor having a first resistance value. A second impedance calibration part configured to perform a second impedance calibration operation of generating a second impedance calibration code set for adjusting an impedance of a second terminating resistor to a second target value, with reference to a reference resistance unit, a resistance value of which is set to a second resistance value according to a part of the first impedance calibration code set.

A calibration operation determines a resistance of a sense resistor in a POE system. A voltage measurement is taken with a first current flowing through the sense resistor. A second voltage measurement is taken with a second current flowing through the resistor. A resistance value of the sense resistor is determined based on a voltage difference between the first and second voltage measurements and a current difference between the first current and the second currents.

The utility model provides a constant current source generation circuit, a row driving circuit, a driving chip, a display panel and a device. The constant current source generation circuit comprises a reference current generation unit used for switching an adjustment mode of a reference current according to a control signal, and generating and outputting the reference current with an adjustable current value according to the determined adjustment mode, the adjustment mode comprising determining the reference current according to a reference voltage and an external resistor or determining the reference current according to a built-in current source; the driving unit comprises a first current mirror group, is connected with the reference current generating unit and is used for outputting driving voltage and bias voltage of the first current mirror group; and the channel current output unit comprises a second current mirror group, the first current mirror group and the second current mirror group are matched to form a current mirror, the driving voltage and the bias voltage are provided for the second current mirror group, and the current mirror is used for carrying out mirror image processing on the reference current so as to output constant current source channel current. According to the invention, the current value adjusting range of the constant current source channel current is improved.

The invention relates to the technical field of engines, in particular to an anti-knock ignition system of a hydrogen internal combustion engine, a control method and device of the anti-knock ignition system, a storage medium and electronic equipment. The system comprises an ignition coil, an external resistor and a spark plug, wherein the external resistor is connected to the secondary end of the ignition coil in parallel and close to the side where the spark plug is located; the control method comprises the steps of obtaining a current ignition advance angle; calculating a current knock index; whether the knock index is smaller than a current knock index threshold value or not is judged, if not, the ignition advance angle is adjusted according to a preset updating path, and the preset updating path is jointly determined according to the ignition advance angle, the knock index, the knock index threshold value and the adjusting coefficient; and if yes, the current ignition advance angle is kept, and an ignition control signal is sent according to the current ignition advance angle. Compared with the prior art, the method has the advantages that the risk of secondary discharge of the ignition coil is reduced, and engine knock suppression under all working conditions is achieved.

According to the constant-current control circuit with charge pump type overvoltage protection and the LED constant-current drive circuit provided by the invention, the overvoltage detection circuit is connected with the external resistor to realize output overvoltage protection setting, so that a special output voltage detection and conversion circuit is avoided, the circuit is simplified, and the cost is reduced; besides, a charge pump circuit is also added, so that the constant-current control circuit can continuously adjust the output current to realize constant-voltage control when reaching a set overvoltage protection point, thereby remarkably improving the working stability in an overvoltage protection state.

The invention discloses a constructed wetland microbial fuel cell coupled photocatalytic system for treating fluorine-containing caprylic acid wastewater, and relates to a constructed wetland microbial fuel cell coupled photocatalytic system. The invention aims to solve the problem that CW-MFC and photocatalysis are not combined to improve the removal rate of PFOA at present. The device comprises a reactor shell, a bottom filler layer, an anode region, a middle filler layer, a cathode region, wetland plants and an outer resistor, the bottom packing layer, the anode region, the middle packing layer and the cathode region are sequentially overlapped in the reactor shell from bottom to top, the cathode region loaded with a photocatalyst is connected with the anode region through an external resistor to form a circuit, a water inlet is formed in the lower part of the reactor shell, and a water outlet is formed in the upper part of the reactor shell. And the roots of the wetland plants penetrate through the cathode region and are planted in the middle filler layer. The invention belongs to the technical field of perfluorinated compound pollution remediation.

A battery self-discharge testing method, system and apparatus. According to the method, during determination of a voltage drop of a battery, the battery is connected in parallel to an external resistor with specific resistance for a certain duration, and then self-discharge testing of the battery is completed on the basis of a voltage drop result after the parallel connection. Therefore, the effect of accelerating a battery discharge process by reducing the parallel connection resistance of a circuit, so as to shorten a battery voltage drop acquisition duration is achieved. Therefore, the problem in the related art of long battery self-discharge testing time caused by a battery needing to undergo long time standing to achieve the measurement of a reliable voltage drop when the battery has a large capacity or a testing instrument has a low precision standard is alleviated.

The present invention discloses a device with a variable potential multi-field plate structure, including a drain electrode, a source electrode, a gate electrode, a plurality of resistors and a plurality of field plates, the number of the resistors being equal to the number of the field plates, the plurality of field plates comprising a first field plate and a remaining field plate, the first field plate being connected to the gate electrode, and the remaining being the remaining field plates; the remaining field plates being connected between the source electrode and the drain electrode or between the gate electrode and the drain electrode through a resistor; the resistor being an external resistor, the gate electrode or source electrode, the remaining field plate, and the drain electrode being respectively connected to different potential ends of the series-connected external resistor. The device of the present invention has a variable multi-potential in which the field plate can self-gradiently match the drain electrode potential; the problem of dielectric layer breakdown reliability failure caused by high electric field and the problem of dielectric layer charge capture caused by high electric field strength are solved.

There are provided an apparatus and method for performing impedance control (ZQ) calibration without a ZQ pin and an external resistor. The apparatus includes an output driver circuit connected to a signal pin interfacing with an external device; a register control word (RCW) configured to store an output driver impedance parameter related to a pull-up output voltage (VOH) condition of the signal pin; and a ZQ calibration circuit connected to the signal pin and configured to perform calibration using a VOH target level of the signal pin and control a termination resistance of the signal pin.

To measure the temperature of an electromagnetic induction type angle detector without requiring complex calculations or external resistors.SOLUTION: The electromagnetic induction type angle and temperature detection system includes: an electromagnetic induction type angle detector (10) including a rotor and a stator around which an excitation winding (11), an output winding (12), and a detection winding (13) are wound; an excitation signal generation unit (110) for supplying an excitation signal to the excitation winding (11); an angle conversion unit (120) for obtaining a rotation angle of the rotor by processing an output signal obtained from the output winding (12); a measurement unit (130) for measuring a correlation between a detection signal obtained from the detection winding (13) and the excitation signal; and a temperature calculation unit (150) for calculating the temperature of the electromagnetic induction type angle detector (10) on the basis of the correlation, the detection winding (13) being wound around the stator so as to be magnetically coupled with the excitation winding (11).SELECTED DRAWING: Figure 1

This invention provides a pulse voltage regulation circuit, comprising: a pulse control module and a reference voltage regulation module; the pulse control module is used to generate a set of M switching control signals according to the number of continuously input pulse signals; the reference voltage regulation module is connected to the output terminal of the pulse control module and is used to select a resistor voltage division ratio according to the M switching control signals, and to divide the bandgap voltage according to the selected resistor voltage division ratio to generate a reference voltage output; wherein, M = 2 N N is an integer greater than or equal to 1. The pulse voltage regulation circuit provided by this invention solves the problem of existing voltage regulation schemes adjusting the output voltage by changing the resistance value of external resistors.

To provide a digital input module that can switch voltage for contact detection with a simple configuration.SOLUTION: In a digital input module, when voltage for contact detection is applied to an external input terminal to which an external resistor is connected in parallel with an external device, contact detection is performed on the basis of dark current flowing in external wiring. A first power supply unit for applying the voltage for contact detection is configured to be capable of switching the voltage for contact detection on the basis of a setting signal.SELECTED DRAWING: Figure 1

The invention discloses an adjustable high-voltage output low-ripple switching power supply which comprises an input filter circuit, a VCC power supply circuit, a PWM controller, a main power circuit, a high-frequency transformer, a linear voltage regulation circuit, an output rectification filter, an output voltage regulation circuit and an output auxiliary source reference circuit. The method for realizing low-ripple high-voltage adjustable output and controlling the voltage and current slew rate of an external N-channel MOSFET switch comprises the steps of independently setting the voltage slew rate and the current slew rate, setting the voltage slew rate through an external capacitor and setting the current slew rate through an external resistor. The high-voltage adjustable output is realized, the output ripple is reduced, the voltage regulation rate is improved, the EMI (Electro-Magnetic Interference) performance is optimized, the high-frequency harmonic power is reduced, the efficiency loss is reduced, and the problem that the traditional switching power supply cannot realize high-voltage, adjustable and low-ripple output at the same time is solved.

The present invention discloses a method and device for in-situ remediation of black and odorous water bodies by using a microbial fuel cell-aquatic plant. The steps are as follows: A. Bury an anode plate at a position below the sediment-water interface of the black and odorous water body; B. Pass the roots of the aquatic plants through the circular holes on the anode plate and root them in the sediment; C. Set a cathode plate at the water-air interface so that the cathode plate floats in the water surface and the cathode plate is exposed to the air; D. Connect the anode plate and the cathode plate with an external wire and an external resistor to form a current loop. The anode plate is located below the sediment-water interface. There are circular openings arranged in an equidistant array on the anode plate. The roots of the aquatic plants pass through the openings of the anode plate and penetrate into the sediment. The cathode plate floats at the overlying water-air interface. The anode plate and the cathode are connected in sequence through an external wire and an external resistor to form a current path. The method is simple, the operation is convenient, the structure is simple, which promotes the absorption of nutrients by aquatic plants, converts them into plant biomass, and improves the black and odorous and eutrophic state of the water body.

The invention provides a transformer residual magnetism detection method for improving direct current demagnetization, and belongs to the technical field of power equipment detection. The method comprises the following steps: demagnetizing a transformer iron core to eliminate an interference magnetic field, applying direct current excitation through a special winding to generate controllable preset residual magnetism, establishing a detection circuit in which a primary side winding is connected with an external resistor in series and a secondary side winding is open-circuited, and sequentially applying direct current small signal excitation with the same size and opposite directions, the method comprises the following steps: collecting forward and reverse transient current and voltage waveforms, comparing current change rate after filtering to judge the residual magnetism direction, solving the equivalent resistance of an iron core based on the waveform consistent with the residual magnetism direction, obtaining a detection result by combining the monotone fitting relationship between the resistance and residual magnetism, and finally assisting verification and calculating a relative error through an energy method. And if the error does not exceed 5%, it is determined that detection is effective, accurate and lossless detection of the magnitude and direction of the residual magnetism can be achieved, and detection reliability and engineering applicability are effectively improved.

A first impedance calibration part configured to perform a first impedance calibration operation of generating a first impedance calibration code set for adjusting an impedance of a first terminating resistor to a first target value, with reference to an external resistor having a first resistance value. A second impedance calibration part configured to perform a second impedance calibration operation of generating a second impedance calibration code set for adjusting an impedance of a second terminating resistor to a second target value, with reference to a reference resistance unit, a resistance value of which is set to a second resistance value according to a part of the first impedance calibration code set.

The invention belongs to the technical field of analog integrated circuit power management, and provides an adjustable dead time generating circuit for half-bridge driving topology. The circuit specifically comprises a voltage-to-current circuit (V-to-I), a transient enhancement circuit (TEC) and a dead time generation circuit. Different charging currents are obtained by adjusting the size of an off-chip resistor, the capacitor at the input end of the comparator is charged, and when the voltage on the capacitor reaches the reference voltage of the comparator, the output of the comparator is reversed, so that a short pulse is obtained. And adding the obtained short pulse and the input signal to obtain a control signal containing the dead time. Compared with a traditional structure, the half-bridge circuit has the advantages that the dead time in linear relation with the size of the off-chip resistance can be generated, high accuracy is achieved, the half-bridge circuit can have flexible dead time in different application scenes, and the reliability and efficiency of a system are ensured while performance requirements are met.

Techniques for controlling the programming current of a PCM-based AI device using an external resistor are provided. In one aspect, a PCM cell includes: a PCM stack, that has a bottom electrode; a heater disposed directly on the bottom electrode; a PCM unit including a first material disposed on the heater; a top electrode including a second material disposed on the PCM unit; and a resistor adjacent to the PCM stack, wherein the resistor includes a combination of the first material and the second material. A PCM device that includes at least one of the PCM cells, and a method of forming the PCM cell are also provided.

The invention provides a semiconductor memory device and a control method thereof, which can shorten the time of resistance-pull calibration processing when an external resistor is connected with a plurality of memory chips. A semiconductor memory device including a plurality of memory chips connected to a common external resistor through a calibration pad; and a control unit for performing pull-down calibration on one or more second memory chips different from a first memory chip among the plurality of memory chips during a period in which the pull-up calibration is performed on the first memory chip among the plurality of memory chips, and performing pull-down calibration on one or more second memory chips different from the first memory chip among the plurality of memory chips during a period in which the pull-up calibration is performed on the second memory chips. And performing pull-down calibration on the first memory chip.

A retinomorphic sensor is demonstrated employing organic semiconductors. The sensor produces an output voltage in response to changes in illumination, but zero output voltage under constant illumination. The device is stable for periods up to one hour, exhibits a decay constant tunable through choice of external resistor, with fastest response times below 10 μs.

This invention provides a threshold voltage adjustment circuit that allows for easy adjustment of the threshold voltage. [Solution] The threshold voltage adjustment circuit 10 includes a reference current circuit 20 and a transimpedance circuit 30. The reference current circuit 20 outputs a reference current formed on the substrate. The transimpedance circuit 30 has multiple resistors on the substrate and the threshold voltage V is expressed as a function of the combined resistance of the multiple resistors and external resistors and the reference current. TH Outputs.

The invention provides a simulation model and a simulation method of an LDMOS (Laterally Diffused Metal Oxide Semiconductor). The simulation model comprises a channel, a grid electrode, a source electrode, a drain electrode and a body region of the LDMOS, the leading-out end of the drain electrode is a drain end, and the leading-out end of the body region is a body end; an external resistor is connected between the drain terminal and the channel, and a voltage control current source is connected between the drain terminal and the body terminal; the anode of the voltage-controlled current source is connected with the drain terminal, and the cathode of the voltage-controlled current source is connected with the body terminal; the voltage-controlled current source is used for simulating the second peak characteristic of the characteristic curve of the current of the body region changing along with the voltage difference between the grid electrode and the source electrode. According to the method, the macro model of the external resistor is combined with the voltage control current source specially used for describing the secondary peak value of the current in the body region, the second higher current (secondary peak value) characteristic of the LDMOS is well described or simulated, and more accurate simulation reference can be provided for circuit designers.

According to the technical scheme, the DA conversion circuit with the high-precision reference voltage comprises a high-precision reference voltage chip with the model number of SW688 and a digital-to-analog conversion chip with the model number of SDA8412, and a first pin of the high-precision reference voltage chip is directly connected with the VREFH end of the digital-to-analog conversion chip without passing through any series resistor; the fifteenth pin of the high-precision reference voltage chip is directly connected with the VREFL end of the digital-to-analog conversion chip without passing through any series resistor. For a module which has completed design and production, the reference voltage precision can be adjusted by modifying a series resistor, so that ineffective re-design change is avoided, or instability caused by environmental factor change of reference voltage output correction by using external resistor adjustment is avoided.

The utility model relates to a photoelectric signal circuit for detecting air particulate matters, which comprises a photoelectric tube D4 and an operational amplifier U3A, the positive electrode of the photoelectric tube D4 is connected to the in-phase input end of the operational amplifier U3A, the negative electrode of the photoelectric tube D4 is connected to the inverting input end of the operational amplifier U3A, a capacitor C28 and a resistor R26 which are connected in parallel are bridged between the inverting input end and the output end of the operational amplifier U3A, and the capacitor C28 and the resistor R26 are connected in parallel. The output end of the operational amplifier U3A is further connected with a resistor R41 and a capacitor C44 which are connected in series and grounded, a resistor R33 is further externally connected between the positive electrode of the phototube D4 and the in-phase input end of the operational amplifier U3A, a resistor R39 and a capacitor C38 are further connected in parallel, and the resistor R39 and the capacitor C38 are connected in series. And the concentration or the diameter of the particulate matter can be obtained by processing the photoelectric signal.

The invention provides a multi-channel bridging discharging method, device and equipment and a storage medium, and the method comprises the steps: obtaining the electrical parameter data of the input end and the output end of each output channel of a charger, and generating a state parameter group through the joint analysis of the electrical parameter data and the remaining capacity of a battery; constructing a bridging path between the target energy supply channel and the target energy discharge channel according to the connection relationship between the state parameter group and the buck-boost circuit; and the electric energy of the battery is transmitted to the high-power external resistor for discharging by sending a pulse width modulation control signal to the buck-boost circuit of the bridge path. According to the invention, the internal heat consumption discharge mode of the charger is converted into high-power external resistor heating to consume electric energy, and the discharge efficiency can be effectively improved while the service life of the charger is protected.