102 results about "Constant current source" patented technology

Provided are a suspension system and an active force control method, relating to the technical field of suspensions. The suspension system comprises a first constant flow source (401), a second constant flow source (402), a first damping valve (403), a second damping valve (404), a shock absorber (405), and a liquid container (406). The shock absorber (405) comprises a first liquid cavity (4051) and a second liquid cavity (4052) separated by a piston. The first constant flow source (401) and the second constant flow source (402) are used for outputting liquid at a constant flow rate. The liquid container (406) is used for storing or replenishing liquid flowing in the system. An outlet of the first constant flow source (401) is connected to a first end of the first damping valve (403) and the first liquid cavity (4051). A second end of the first damping valve (403) is connected to the liquid container (406), and the liquid container (406) is connected to an inlet of the first constant flow source (401). An outlet of the second constant flow source (402) is connected to a first end of the second damping valve (404) and the second liquid cavity (4052). A second end of the second damping valve (404) is connected to the liquid container (406), and the liquid container (406) is connected to an inlet of the second constant flow source (402). A suspension system having a high operating bandwidth without additionally significantly increasing unsprung mass can be implemented.

The present application relates to the technical field of optical coupling, and particularly relates to a constant current optical coupling isolation circuit based on a depletion mode MOSFET; through the cooperation of a reverse protection module, a self-bias constant current module and a response enhancement module, super-wide voltage input, low power consumption and high-speed dynamic response are realized in the circuit, to a certain extent, the inherent technical contradiction that the traditional resistance current limiting scheme cannot simultaneously consider reliable conduction and low power consumption under wide voltage, and the slow response of high CTR optical coupling is solved, the structure is extremely simple and the reliability is high, a self-bias constant current source based on a depletion mode MOSFET is adopted, only one resistor is needed to realize relatively accurate constant current output in a super-wide input range of 9.6V to 400V, replacing the current limiting resistor with huge power consumption under high voltage or the active constant current source with complex circuit in the traditional scheme, and the power consumption under high voltage application is reduced; the technical problem that the existing resistance current limiting scheme is limited in widening the input voltage range of the optical coupling is solved.

This invention relates to the field of inverter technology, and particularly to a heterogeneous power device hybrid inverter and its space vector modulation method. The heterogeneous power device hybrid inverter provided in this invention includes a first constant current source, a second constant current source, a main power inverter module, a secondary power inverter module, and a capacitive reactance module. The first constant current source is connected to the main power inverter module to provide current to the main power inverter module. The main power inverter module includes multiple silicon-based insulated-gate bipolar transistors (SBMTs) as main switching transistors, and the main power inverter module is connected to the capacitive reactance module. The second constant current source is connected to the secondary power inverter module to provide current to the secondary power inverter module. The secondary power inverter module includes multiple silicon carbide-based metal-oxide-semiconductor field-effect transistors (MOSFETs) as secondary switching transistors, and the secondary power inverter module is connected to the capacitive reactance module. The heterogeneous power device hybrid inverter and its space vector modulation method provided by this invention can balance high inverter frequency and low switching losses.

This invention provides a liquid leak detection system, including a host computer and detection nodes that are communicatively and electrically connected to the host computer. The host computer sends instructions to the detection nodes and receives detection data transmitted by the detection nodes. Each detection node includes a control system and detection lines; the detection lines include five cables arranged in parallel: the first and second cables are power lines used to supply power to the detection nodes and transmit data; the third cable is a detection wire with a braided sheath; the fourth cable is a rubber conductor with resistance; and the fifth cable is an insulated conductor. The control system includes a controller, a constant current source unit, and a constant voltage source unit electrically connected to the controller. The constant current source unit and the constant voltage source unit can be switched arbitrarily to achieve different detection functions. The liquid leak detection system and method provided by this invention have a simple system structure, long detection distance, high accuracy, and can simultaneously detect multiple areas.

The present application relates to a kind of portable parallel thyristor quick pairing measuring instrument and method, belong to power electronic equipment maintenance tool and method technical field.The technical scheme of the present application is: reference thyristor is installed in reference thyristor measuring fixture (1), connects reference thyristor measurement circuit;Thyristor to be measured is installed in thyristor to be measured measuring fixture (2), connects thyristor to be measured measurement circuit;The output end of common constant-current source circuit (3) is simultaneously connected reference thyristor and thyristor to be measured;Comparison type indicating module (4) is connected between reference thyristor measurement circuit and thyristor to be measured measurement circuit, synchronous trigger circuit (5) is connected reference thyristor and thyristor to be measured, and reference thyristor and thyristor to be measured are triggered synchronously.The beneficial effects of the present application are: effectively guarantee the scientificity and accuracy of pairing screening, simple structure, low cost, convenient operation.

The present application discloses a battery system and a power supply system. The battery system comprises a processing circuit, a constant current source and a plurality of battery packs; each battery pack comprises at least one sampling resistor; the sampling resistors of all the battery packs are connected in series across the constant current source; voltages across the constant current source can directly reflect corresponding voltage protection values when different numbers of battery packs are connected in series; the processing circuit is connected across the constant current source, and uses the voltage across the constant current source as a voltage protection value to compare same with a voltage after the plurality of battery packs are connected in series. According to the battery system provided by the present application, the voltage protection value is directly represented by means of the voltage across the constant current source, and there is no need for an installation worker to open a switch box on site to adjust the voltage protection value by means of a DIP switch, thereby achieving convenience and rapidness, improving the safety, and reducing personnel costs.

Disclosed is an H-bridge control circuit for an electro-stimulation therapeutic instrument for neuromodulation. The H-bridge control circuit includes an H-bridge circuit and a constant current source, where the H-bridge circuit includes a first positive channel metal oxide semiconductor (PMOS) transistor, a second PMOS transistor, a first negative channel metal oxide semiconductor (NMOS) transistor and a second NMOS transistor. Corresponding switching diodes are additionally arranged between the first PMOS transistor and a load and between the second PMOS transistor and the load to avoid an influence of safety of the therapeutic instrument by discharging charges during an interval of stimulation; and moreover, a resistance-capacitance (RC) circuit is additionally arranged between the first PMOS transistor, the second PMOS transistor and a control device such that connection and disconnection of the PMOS transistor can be controlled.

The utility model aims at providing a kind of high-efficient real-time constant-temperature control measuring device of constant temperature control and monitoring provided by simulation heat source.It is provided that the utility model includes heating unit, control unit and temperature acquisition unit, the control unit includes processor and heating control module connected by electric signal, the temperature acquisition unit acquires the temperature data of the heating unit and is connected with the processor by electric signal, the heating control module includes two-way control module, controllable power output module, controllable constant-current source module and current acquisition module, one output of the two-way control module is connected to the controllable power output module, another output of the two-way control module is connected with the controllable constant-current source module, the output of the controllable power output module is connected with the controllable constant-current source module, and the controllable constant-current source module is electrically connected with the heating unit.The utility model is applied to the technical field of temperature test.

The utility model relates to electronic circuit technical field, concretely relates to an adjustable constant current source drive circuit, in the drive circuit, when the second input end of adjusting circuit receives voltage signal, current sampling circuit perceives the current of load and forms voltage difference at both ends, feedback circuit gathers voltage difference and forms feedback signal input to adjusting circuit, and adjusting circuit exports adjusting signal according to feedback signal and received voltage signal, and the process of adjusting signal and feedback signal, gathering voltage difference, repeatedly perceiving current is repeated until feedback signal and voltage signal are consistent, and load current reaches stable value. The adjustable constant current source drive circuit provided by the utility model embodiment, through the setting of current sampling circuit, feedback circuit, adjusting circuit and control circuit, not only realizes the closed loop control and accurate adjustment of load current, and through double -end sampling, avoids the problem of system power supply noise and unstable influence introduced by single -end sampling.

The application provides a four-wire temperature acquisition and self-checking circuit, which comprises a constant current source generation circuit, a constant current source detection circuit, a first operational amplifier conditioning circuit, a second operational amplifier conditioning circuit, a four-wire temperature acquisition unit and an ADC data conversion and communication control unit; the ADC data conversion and communication control unit comprises an ADC conversion chip A3 for outputting and inputting a reference voltage VREF; the constant current I_TEMP output by the constant current source generation circuit flows through the sampling resistor R10 and the four-wire temperature acquisition unit, and the voltage generated across the sampling resistor R10 is input to the constant current source detection circuit to output the voltage TEMP_V to the ADC conversion chip A3; when the I_TEMP flows through the four-wire temperature measuring element RT in the four-wire temperature acquisition unit, the voltage generated across the four-wire temperature measuring element RT is input to the first operational amplifier conditioning circuit and the second operational amplifier conditioning circuit respectively, and then the stable voltages TEMP_VA and TEMP_VB are output to the ADC conversion chip A3 respectively. The application can improve the temperature measuring precision and the accuracy of detecting the voltages of the circuits, and ensure the normal operation of the system in the case of one-side fault.

This disclosure provides a BUCK chip and its adaptive dead-time circuit and dead-time acquisition method. The adaptive dead-time circuit includes an upper-side dead-time control branch and a lower-side dead-time control branch. The upper-side dead-time control branch includes a first sample-and-hold circuit, a first constant current source, a first current superposition node, a first timing capacitor, and a first inverter. The first inverter is used to output an upper-side turn-on signal when the voltage on the first timing capacitor reaches its flip-flop threshold. The lower-side dead-time control branch includes a second sample-and-hold circuit, a second constant current source, a second current superposition node, a second timing capacitor, and a second inverter. The second inverter is used to output a lower-side turn-on signal when the voltage on the second timing capacitor reaches its flip-flop threshold. When the load current of the BUCK chip increases, at least one of the first characteristic current and the second characteristic current increases to shorten the corresponding fixed dead-time.

This invention discloses a non-invasive real-time monitoring and intervention system for preventing and treating lower extremity deep vein thrombosis (DVT). It is characterized by comprising an impedance monitoring module, a microcurrent stimulation module, and a data analysis and display module. The impedance monitoring module is connected to the data analysis and display module and includes an impedance measurement circuit and a ring-shaped flexible electrode patch. The ring-shaped flexible electrode patch employs a ring-shaped multi-electrode array composed of multiple sets of electrodes, with current injected into the distal electrodes and voltage difference detected at the proximal electrodes. The impedance monitoring module measures changes in lower extremity impedance through the ring-shaped multi-electrode array. The microcurrent stimulation module is connected to the data analysis and display module and uses a constant current source output. The data analysis and display module includes a main controller and a display. The main controller combines a machine learning model to predict DVT risk, achieving closed-loop control. This invention exhibits good stability, achieving non-invasive, real-time, continuous monitoring and active intervention, overcoming the shortcomings of existing monitoring and prevention technologies.

The application provides a sensor parameter detection method and device of a resistance fabric and a medium, and relates to data processing technology. The method comprises the following steps: when a sensor of a target resistance fabric is a series resistance fabric sensor, a constant current source is applied to the target resistance fabric, a target output voltage of the target resistance fabric is obtained, an initial series curvature change of a target bending part of a hose is determined based on the target output voltage of the target resistance fabric, when a bending type of the target bending part is radial single-point deformation, the initial series curvature change is taken as a target series curvature change, when the bending type of the target bending part is axial single-edge deformation, an initial bending angle is determined based on the initial series curvature change, and the target series curvature change is determined based on an axial series-parallel correction value corresponding to the initial series curvature change and the initial bending angle, so that the prediction accuracy of the target series curvature change is improved.

This application discloses a signal calibration system for a plasma etching machine. The system includes a constant current source device, an electronic load instrument, and a host computer. A target constant current output unit in the constant current source device is communicatively connected to both the host computer and the electronic load instrument. The host computer is also communicatively connected to the electronic load instrument. The host computer sequentially sends M2 current output commands to the target constant current output unit. The target constant current output unit outputs a corresponding second driving current, which flows through the electronic load instrument to generate an output voltage. The target constant current output unit detects this output voltage and generates a voltage register value. The electronic load instrument detects the output voltage and outputs the measured voltage. When the measured voltage reaches the calibration voltage, the host computer generates a second mapping table based on the measured voltage and the voltage register value, and sends the second mapping table to the target constant current output unit. This signal calibration system uses the electronic load instrument as a calibration reference, improving calibration accuracy.

The present application relates to a kind of test circuit of memristor, belong to the technical field of test of memristor.The present application discloses a kind of test circuit of memristor, including voltage source module 1, constant current source module 2, analog switch 3, sampling resistance 4, current-limiting judging module 5, memristor 6 and auxiliary measurement acquisition module 7, with the following advantages:(1) the test instrument of the test circuit of memristor is small and portable, can verify device immediately;(2) limiting current can reach microampere level, can reach smaller limiting current value, and can detect current value in real time;(3) the resistance range of detection is large, can cover most use scenarios, can be extended into two-end device IV curve measurement;(4) compared with large instrument, cost is lower.

The application discloses a simple and high-precision constant-temperature tank based on logarithmic operation, wherein a detecting element and a heating element are R1 and R2, R1, R2, R3 and R4 constitute a measuring bridge, P1 is used for adjusting the ratio of R3 and R4, the voltage of two opposite diagonal points A-B of the bridge enters operational amplifiers A1 and A2, A1 and A2 are in-phase outputs, and two diodes are connected to two opposite-phase terminals for correcting the nonlinearity of the temperature coefficient of the heating element, so that A1 and A2 each constitute a logarithmic amplifier with the diodes, the outputs of A1 and A2 control transistors TR3 and TR4 respectively, and then control the adjusting tubes TR1 and TR2 of a constant-current voltage stabilizer, the voltage Eo between the emitters of TR1 and TR2 is always kept unchanged, the current io passing through the bridge is also supplied by a constant-current source, and the constant-temperature tank dynamically maintains constant temperature.

Embodiments of the present disclosure provide a short-circuit recovery soft-start circuit and a voltage regulator circuit. The short-circuit recovery soft-start circuit comprises a first constant current source, an energy storage circuit, a first voltage comparison circuit, a short-circuit control circuit, and a pull-down circuit. The first constant current source provides a first constant current to the energy storage circuit via a first node. The energy storage circuit stores charges from the first constant current to generate a soft-start signal. The first voltage comparison circuit has a first input and a second input, and a first offset voltage between the first input and the second input. The first voltage comparison circuit generates a pull-down control signal. The pull-down control signal is at an active level when a voltage of the soft-start signal is greater than a sum of a feedback voltage and the first offset voltage. The short-circuit control circuit causes the pull-down control signal to be at an inactive level when a short-circuit indication signal is at the inactive level, and otherwise does not affect the pull-down control signal. The pull-down circuit pulls down the soft-start signal when the pull-down control signal is at the active level.

This invention provides a simulation test system and method for high-speed engine siphon operating conditions. The test system includes a test platform, a transmission module, a simulated engine rotor runout module, a siphon heating module, a control module, and a test module. The test module includes leads, a standard constant current source, and a voltage measurement module. It detects the electrical noise of each channel of the high-speed siphon rotor during rotation. The test method involves shorting each pair of channels to be tested at the rotating end of the high-speed siphon, and connecting the two shorted channels to the voltage measurement module at the static end to form a complete measurement loop. The reliability of the channels is evaluated by monitoring the voltage stability of this loop during rotation. By simulating rotor runout and high-temperature environment during aero-engine testing, the signal transmission stability of the high-speed siphon during use is verified, meeting the requirements for high-speed siphon signal transmission performance verification in aero-engine testing scenarios.

The application discloses a high-precision drain-source voltage detection circuit for synchronous rectification of an LLC resonant converter, one end of a drain-source off voltage blocking circuit is connected with a drain electrode of a synchronous rectification tube to be detected, the other end of the drain-source off voltage blocking circuit is connected with a cathode of a compensation diode, an anode of a clamping diode and a same-direction input end of an operational amplifier, one end of a first current-limiting resistor is connected with an anode of the compensation diode, the other end of the first current-limiting resistor is connected with a cathode of the clamping diode and a constant-current source circuit, one end of a first compensation resistor is connected with the anode of the compensation diode, the other end of the first compensation resistor is connected with a reverse input end of the operational amplifier, a cathode of a stabilizing tube is connected with the cathode of the clamping diode, an anode of the stabilizing tube is grounded, and an output end of the operational amplifier is used as a final output signal end; and the circuit can accurately detect the drain-source voltage of the LLC resonant converter.

The application provides a current frequency conversion circuit, a conversion method and an inertial navigation device. The circuit comprises a current frequency conversion unit and a control unit. The current frequency conversion unit comprises an integration circuit, an ADC sampling circuit, a switch circuit and a constant current source circuit. The control unit comprises an ADC acquisition module, a constant current source control module, a pulse counting module, a temperature acquisition module, a temperature compensation processing module, a digital signal to pulse module and a pulse output module. The ADC acquisition module is connected with the ADC sampling circuit, the constant current source control module and the pulse counting module respectively. The constant current source control module is connected with the switch circuit. The temperature compensation processing module is connected with the pulse counting module, the temperature acquisition module and the digital signal to pulse module respectively. The pulse output module is connected with the digital signal to pulse module and a driving circuit respectively. The technical scheme of the application solves the technical problem that the system without the serial bus hardware condition cannot apply the software compensation and the hardware compensation precision cannot meet the requirement in the prior art.

This invention discloses a multi-channel signal acquisition system suitable for SERF atomic gyroscopes, belonging to the field of quantum precision measurement and sensing technology. The system employs a PT1000 platinum resistance four-wire constant current source for temperature measurement, suppressing noise through low-pass and differential-mode filtering. The optical power signal is converted into a voltage signal via a photodetector and transimpedance amplifier. The gyroscope signal is amplified by transimpedance and differential amplification to improve the signal-to-noise ratio. Multiple signals are acquired in parallel by a 32-bit ADC chip ADS1263. After digital filtering and buffering of the data by an FPGA, the data is transmitted to a host computer at a rate of 480Mbps via a USB3320C chip. The power supply system adopts an LDO cascade and ferrite bead isolation design, providing low-ripple +5V and +3.3V voltages. This invention achieves high-precision synchronous acquisition of multi-channel signals, featuring low noise and high integration, providing important support for the research and application of SERF gyroscopes.

This invention provides a soft-start circuit, relating to the field of electronic and electrical technology. It includes a constant current source module that outputs a zero-temperature coefficient nA-level constant current; a constant current charging module that linearly charges a soft-start capacitor with a constant current, generating a linearly rising soft-start reference voltage; a feedback control module that clamps the output sampling voltage to the reference voltage through a negative feedback loop, ensuring a smooth rise in output voltage; a low-power logic control module that shuts down the constant current charging and feedback control modules after soft-start; and a gate drive module that drives the power devices to conduct. The advantages include using a zero-temperature coefficient nA-level current combined with negative feedback clamping to solve the problems of temperature drift, unstable charging slope, and low control accuracy in traditional RC structures; shutting down related modules after soft-start, combined with a low-current design to reduce static power consumption; and the ability to integrate the circuit on a standard process chip without external components, reducing system size and cost.

This application discloses a current source input converter based on a bidirectional Zener diode array; relating to the power supply field, it solves the problems of low efficiency, lack of redundancy protection, and high heat dissipation pressure of current source input converters. The bidirectional Zener diode array, in conjunction with a full-bridge rectifier circuit, enables the converter to adapt to any polarity of the input current. Regardless of the polarity of the constant current source, it can clamp and rectify it into a unidirectional DC bus voltage. The input terminals of the first DC / DC converter circuit and the second DC / DC converter circuit are connected in parallel, and their output terminals are also connected in parallel, forming a hot backup architecture with parallel input and parallel output. When one DC / DC converter circuit fails and stops working, the other continues to supply power to the load. The voltage regulation circuit detects the DC bus voltage and controls the conduction of the bypass current circuit to bypass excess current to ground. The bypass circuit diverts excess current, reducing the current flowing through the bidirectional Zener diode array and thus reducing the power consumption of the Zener diode array.

The application provides a resistance measurement circuit, a wafer temperature measurement system, a temperature measurement wafer and an assembling device thereof. Since the internal resistance of the voltage detection module is usually very large, the current flowing through the two connecting lines between the detection end of the voltage detection module and the thermistor temperature sensor is approximately equal to zero, so that the detection result of the voltage detection module is approximately equal to the voltage between the two pins of the thermistor temperature sensor. According to the connection relationship of the thermistor temperature sensor, the thermistor temperature sensor, the connecting line between the thermistor temperature sensor and the constant current source and the connecting line between the thermistor temperature sensor and the ground are connected in series, so that the current flowing through the thermistor temperature sensor is the output current of the constant current source. In summary, the resistance value of the thermistor temperature sensor determined by the controller according to the detection result of the voltage detection module and the output current of the constant current source is more accurate, thereby improving the measurement accuracy of the resistance value of the thermistor temperature sensor.

The application relates to the technical field of constant current sources, and provides a temperature-independent constant current source, which comprises a positive temperature current generating circuit, a negative temperature current generating circuit and a current summing circuit.The positive temperature current generating circuit comprises a first branch, a second branch and a first resistor, the structure of the first branch and the second branch is an asymmetric structure, and the current flowing through the first branch and the second branch generates a voltage difference on the first resistor, which is proportional to temperature, so as to generate a first current.The negative temperature current generating circuit comprises a transistor or a field effect transistor and a second resistor, and the emitter-base voltage or the gate-source voltage of the transistor or the field effect transistor is applied to the second resistor, so as to generate a second current.The current summing circuit comprises a first current mirror and a second current mirror, and the output current is the sum of the first current and the second current in a mirror ratio.The application has a simple overall structure and wide use conditions.

The application discloses a system and method for pre-adjusting zero of a motor rotor of a new energy vehicle, and relates to the technical field of new energy motor manufacturing. The system core comprises a PLC logic control unit, a relay isolation driving unit, an alternating current contactor execution unit, a high-precision adjustable constant current source unit and a rotor position detection unit, bidirectional communication is established between the PLC and the constant current source, the relay and the contactor are used to control the on-off of the power supply circuit and the phase sequence switching, and a double closed-loop control architecture is constructed in combination with real-time feedback of the rotor position, so that the full-process automation execution of rotor driving, position monitoring and zero calibration can be automatically completed without manual operation, the industry pain points of insufficient precision, poor universality, low production efficiency and weak operation reliability of the existing pre-adjusting zero system are solved, the pre-adjusting zero calibration precision and the equipment flexible adaptation capability are greatly improved, and the operation efficiency is improved, and the system is fully suitable for the large-scale and flexible mass production demand of new energy motors.

This invention relates to a sensor sampling device, method, terminal, and medium based on a constant current source, belonging to the field of vehicle sensor technology. It includes a control module, a sensor sensing element, and an external power supply. The control module comprises a main controller, a first-stage step-down circuit, a constant current source circuit, an internal pre-drive circuit, a first switch, a second switch, and a sampling circuit. By setting the first switch and the internal pre-drive circuit, this invention ensures that after power-on, the constant current source circuit reaches a constant output. Then, the first switch is opened, and the second switch is closed, allowing the constant current source circuit to provide a stable, constant current output to the sensor sensing element, thereby improving the sampling accuracy of the sensor sensing element.

This invention discloses a laser driving circuit. The circuit provides driving current to a laser output unit. The laser driving circuit includes a low-dropout linear regulator and a constant current source circuit. The low-dropout linear regulator, the laser output unit, and the constant current source circuit are connected in series to form a series circuit. The low-dropout linear regulator provides a stable voltage to the laser output unit, and the constant current source circuit stabilizes the current in the series circuit. This invention, by using a low-noise low-dropout linear regulator, provides a stable voltage to the laser output unit while reducing the impact of power supply noise on the driving current, thus enhancing the anti-interference capability of the laser driving circuit. By feeding back the output current of the laser output unit to the constant current source circuit, it enables a rapid response when the current changes, thereby ensuring the stability of the current in the series circuit and consequently guaranteeing the output stability of the laser output unit.