176 results about "Current constant" patented technology

The invention discloses a flow chemistry intelligent experiment platform which comprises a direct-current constant-voltage power supply, a PC, a main control board, an electric energy metering module, a temperature control module, an electromagnetic valve, a stepping motor, a flow chemistry unit and an image sensor. The PC is provided with a webpage operation end, a control instruction is transmitted to the main control board through the gigabit Ethernet, and the main control board adopts a hardware architecture of FPGA and ARM co-processing and can accurately control devices such as an electromagnetic valve and a stepping motor to carry out experiments according to set reaction conditions; and in the reaction process, images acquired by the sensor and experimental data such as temperature, pressure, pH and the like are synchronously transmitted to the PC through the main control board to be displayed, analyzed and stored. The device provides maximum flexibility for the flowing chemical reaction, realizes integrated control of various reaction conditions such as temperature, pressure, pH and flow velocity, has the advantages of reasonable structure, high degree of freedom, good interactive experience and the like, and is suitable for various scenes such as classroom experiment teaching, student exploration experiment, college laboratory scientific research and the like.

The invention relates to the technical field of wireless charging, in particular to a constant-current and constant-voltage wireless electric energy transmission method and a constant-current and constant-voltage wireless electric energy transmission system. Obtaining the charging current of the next iteration based on the battery end voltage of each iteration in the constant current charging state, the actual output power of the electric energy transmitting end of each iteration, the charging current of each iteration and the equivalent line resistance; when an iteration cut-off condition is satisfied, obtaining a target charging current in a constant current charging state; based on the target charging current, a preset standard current and the internal resistance of the battery, obtaining a voltage compensation amount caused by the change of the charging current; the target switching voltage is obtained according to the voltage compensation amount and the preset standard switching voltage, the constant current charging state can be switched to the next charging state according to the target switching voltage, effective, timely and reliable switching of the constant current is ensured, and then the wireless charging efficiency and safety are ensured.

The invention discloses a high-field impedance spectroscopy measurement method, system and device for a piezoelectric material and a medium, and relates to the technical field of high-field impedance spectroscopy measurement, and the method comprises the steps: loading a sweep frequency signal generated by a signal generator to the piezoelectric material in a high field, and reading a current signal and a current signal amplitude of the piezoelectric material; comparing the read current signal amplitude with a set current constant value, changing the voltage value of the sweep frequency signal according to a set voltage change step length when the current signal amplitude is out of an error range, and outputting the sweep frequency signal of the current frequency; and obtaining a final current signal of the piezoelectric material through the sweep frequency signal of the current frequency, fitting the final current signal to obtain an admittance circle diagram, and measuring the strong field impedance spectrum of the piezoelectric material according to the admittance circle diagram. Corresponding operation and judgment are carried out according to the relation between the current amplitude and the set current error range and the current constant value, and it is guaranteed that the measured current is kept constant all the time.

The invention relates to the technical field of battery charging control, in particular to a charging control method and system for electronic equipment. The method comprises the following steps: counting each historical charging process in a historical database under a constant current charging process, dividing the historical charging process into historical time periods through time period division, and analyzing a comprehensive evaluation coefficient of each historical time period under a current constant current value; for the real-time charging process, the time period similar weight of each historical time period for the real-time time period can be determined in a time period matching mode, the optimal degree of the real-time time period for each constant current value can be determined by performing weighted fusion on the comprehensive evaluation coefficients, and then the charging current in the current real-time time period is determined. According to the invention, data comparison is carried out through big data analysis and a data collaborative filtering mode, dynamic adjustment of the constant current in the charging process of the electronic equipment is realized, and on the basis of ensuring the charging efficiency, the charging safety is improved, and the cycle life of the battery is prolonged.

The invention discloses a dual-frequency compatible constant-current constant-voltage wireless charging system and a parameter tuning method thereof.The whole wireless charging system comprises a transmitting end and a receiving end, and the transmitting end comprises a direct-current voltage source Vdc, a high-frequency full-bridge inverter circuit, a primary side resonance compensation network and a transmitting coil Lp which are sequentially connected; and the receiving end comprises a receiving coil Ls, a secondary side resonance compensation network, a full-bridge rectification filter circuit and a direct-current load Ro which are connected in sequence. According to the invention, the hybrid compensation network is constructed in the system and parameter tuning is carried out on the hybrid compensation network, so that the resonant operation conditions of the system under two different frequencies can be met under the condition that inherent parameters of the system are not changed or complex control and additional devices are not used; on the basis, constant-current and constant-voltage hybrid wireless charging and input impedance zero-phase-angle operation can be achieved only through switching control over the two resonant frequencies, and the technical advantages of being high in efficiency, low in cost and easy to achieve are achieved.

The invention relates to a process for shortening capacity grading time of a lithium battery, which belongs to the field of polymer lithium ion batteries, and comprises the following steps: S1, first charging: adopting a stepped charging mode; s2, second-step discharging: changing low-current constant-current discharging into a large-current discharging and low-current discharging stacked processing step; and S3, third charging: firstly, 0.5 C constant current charging is performed for a specified time, then 0.2 C constant current discharging is performed for a small period of time, the battery voltage falling speed is increased, and finally the shipment voltages of the two working steps are consistent. According to the process for shortening the capacity grading time of the lithium battery, in order to ensure the consistency of the voltage of a shipment battery cell, a charging and discharging mode is adopted in a charging and discharging step, constant-current charging is firstly carried out to a certain value higher than the shipment voltage, then constant-current discharging is carried out for a small period of time, the battery voltage falling speed is increased, the time of a constant-voltage stage can be greatly shortened through the operation, and therefore the charging efficiency is improved; according to the invention, the stack processing step of large-current constant-current discharge and small-current constant-current discharge is adopted, so that the discharge time is shortened, and the capacity grading efficiency is improved.

The utility model discloses an intelligent charging and discharging system, and belongs to the technical field of charging and discharging. Comprising a main control module, the system comprises a temperature sensor module, a heat dissipation assembly, a first charging and discharging management module, a second charging and discharging management module, a third charging and discharging management module, an auxiliary power supply monitoring module, a touch screen module, a switch assembly, a data storage module, an external communication interface module, a fourth charging and discharging management module, an auxiliary power supply module and an external power supply module. A first constant-current constant-voltage output module, a second constant-current constant-voltage output module, a portable charger and an electronic load module; the storage battery can be charged and discharged, the charging and discharging working conditions of the storage battery can be automatically monitored, online monitoring maintenance and data recording, storage and transmission of charging and discharging of the storage battery can be achieved, and the single storage battery can be monitored. The anti-reverse connection charging control circuit can prevent the battery from being damaged by reverse connection, protect equipment from being damaged, and prevent safety accidents caused by current backflow.

The utility model relates to a low-temperature-drift high-precision constant current circuit and constant current source system, the constant current circuit comprises a digital-to-analog conversion chip, a filter circuit, a push-pull driving circuit and an output control circuit, and the output end of the digital-to-analog conversion chip is connected with the first input end of the filter circuit; the output end of the filter circuit is connected with one end of the push-pull drive circuit; the other end of the push-pull driving circuit is connected with the output control circuit; the other end of the output control circuit is connected with the second input end of the filter circuit; the output control circuit comprises a plurality of field effect transistors and a plurality of sampling resistors; the field effect transistors are connected in parallel, and the sampling resistors are connected in parallel. The constant current source system comprises a thermoelectric cooler control circuit; the thermoelectric cooler control circuit comprises a power supply circuit, a drive circuit chip and a current constant circuit. The output end of the drive circuit chip is connected with one end of the current constant circuit, and the other end is connected with the input end of the power supply circuit. The problem that power supply stability is affected due to element power consumption and element resistance drift along with temperature is solved.

The invention discloses a high-voltage cable single-end grounding system resistor live-line detection method, which belongs to the technical field of high-voltage cable grounding system detection, and comprises the following steps: simultaneously arranging measurement clamps in a three-phase grounding loop of a high-voltage cable metal sheath; any two-phase grounding loop is selected as an injection loop, and a direct current constant current source is injected into the injection loop; measuring a direct-current voltage between the third-phase grounding loop which is not injected into the direct-current constant-current source after the multi-stage filtering processing and any phase injection loop by using a measuring clamp; and based on the current value injected into the direct current constant current source and the direct current voltage between the third-phase grounding loop and any phase injection loop, calculating the resistance value of the third-phase grounding loop which is not injected into the direct current constant current source. According to the method, the resistance value of each phase grounding loop can be accurately measured in the running state of the high-voltage cable.

The embodiment of the invention discloses a pump laser aging test system and electronic equipment. The aging test system comprises a light path monitoring system, a liquid cooling heat dissipation system, an electrical control system, a test system and a cabinet body, the optical path monitoring system is used for monitoring a monitoring index of the pump laser in real time to obtain monitoring index data; the test system is used for monitoring the monitoring index data and controlling the electrical control system according to a monitoring result; the electrical control system supplies power to the pump laser through the constant-current and constant-voltage direct-current power supply and performs on-off control on the constant-current and constant-voltage direct-current power supply according to a control instruction sent by the upper computer; and the liquid cooling heat dissipation system is used for performing temperature control on the aging process of the pump laser. The optical path monitoring system monitors multi-dimensional monitoring indexes such as the optical power and the spectrum of the pump laser in real time, it is guaranteed that the aging state of the pump laser is accurately evaluated, various parameters such as the temperature, the current and the voltage of a pump cover plate are covered, and different test requirements can be met.

The invention discloses a novel sodium ion battery and a formation method thereof, and belongs to the technical field of sodium ion batteries. A formation method of a novel sodium-ion battery comprises the following steps: S1, placing the sodium-ion battery in a constant-temperature environment, and charging the sodium-ion battery to 0.5 V through a first constant current to obtain a first formation stage battery; s2, charging the battery in the first formation stage to 3.8 V through a second constant current, and then converting into constant-voltage charging until the charging current is reduced to 0.02 C, so as to obtain a battery in a second formation stage; s3, standing the battery in the second formation stage to obtain a battery after standing; s4, the battery after standing is discharged to 1.0 V through a third current in a constant-current mode and then charged to 3.8 V through a fourth current in a constant-current mode, and a third formation stage battery is obtained; and S5, carrying out charge-discharge circulation on the battery in the third formation stage until the formation is finished. The formation method of the sodium-ion battery can improve the electrochemical performance of the sodium-ion battery.

The application discloses a constant-current constant-voltage converter integrated with a clamping and auxiliary power supply and a starting method thereof, and belongs to the field of power conversion, comprising a main converter and a regenerative clamping circuit; the main converter comprises an inverse resistance H-bridge, a main inductor, a main transformer, an inverse direction H-bridge and a main capacitor; the regenerative clamping circuit comprises a diode clamping circuit, a clamping capacitor and a feedback circuit. The inverse resistance H-bridge of the main converter has at least two bridge arms which are respectively formed by series connection of inverse direction switching devices and diodes, and the series connection points are respectively connected with the anode and cathode of two diodes of the diode clamping circuit; the other two bridge arm connection points of the inverse resistance H-bridge of the main converter are connected with the midpoint of the diode half-bridge of the clamping circuit, so that the passage of the clamping current and the charging current of the current source is provided. The circuit structure provided by the application can not only effectively inhibit the voltage peak of the inverse resistance bridge arm, but also provide an auxiliary power supply for the driving circuit of the inverse resistance bridge arm.

The invention belongs to the field of wireless electric energy transmission, and discloses a three-coil structure constant-current constant-voltage type wireless electric energy transmission system suitable for an office table, the system comprises an electric energy sending unit, a relay unit and a receiving unit, and the relay unit forms a series resonance network through a relay coil L2 and a relay series compensation capacitor C2; the receiving unit consists of a receiving coil L3, a receiving end compensation network, a rectifier D and a battery load R; the input end of the rectifier D is connected with the receiving coil L3, a constant current mode compensation capacitor C3CC and a constant voltage mode compensation capacitor C3CV which can be switched through a switch S are connected in series between the rectifier D and the receiving coil L3, and the output end of the rectifier is connected with a battery load R. The system can realize constant-current and constant-voltage output characteristics meeting battery charging requirements when the equivalent impedance of the battery is changed, and can ensure that the inverter realizes zero-phase-angle switching operation when the equivalent impedance of the battery is changed and the system is subjected to position offset.

The application provides a method for evaluating internal resistance performance of a lithium ion battery. The method comprises the following steps: S1: performing a charge-discharge cycle test on the lithium ion battery to be tested, the charging process is constant-current constant-voltage charging, and the discharging process is constant-current discharging; and S2: evaluating the internal resistance performance of the lithium ion battery to be tested by taking the growth rate of the constant-voltage charging capacity ratio in the xth cycle as B x (B x =(A x -A1) / A1*100%, A x =C 2x / C 1x *100%). The application takes the change rate of the constant-voltage charging capacity ratio in the charging process of the lithium ion battery as the internal resistance growth rate of the material, can continuously monitor the internal resistance change in the cycle process of the battery, and can accurately judge the internal resistance growth rate of different materials. The method is simple and convenient. That is, the method provided by the application has the advantages of short period, low cost, simplicity and convenience, and is suitable for evaluating and screening multiple materials in the material research and development stage.

The invention relates to the technical field of electronic circuits, and discloses a driving circuit, a key and an electronic device, the driving circuit comprises a control module and a first constant current module; the control module is connected with the first constant current module, the first constant current module is further connected with the power supply and the piezoelectric ceramic, and the power supply is further connected with the power supply load; the power supply is used for supplying power to power supply load output power supply current and outputting charging current to the first constant current module; the control module is used for outputting a charging signal to the first constant current module; and the first constant current module is used for keeping the charging current constant according to the charging signal, and transmitting the constant charging current to the piezoelectric ceramic for charging so as to reduce the fluctuation of the power supply current. Compared with the prior art, when the piezoelectric ceramic is charged, the constant charging current is adopted, so that reduction of the current transmitted to the power supply load by the power supply is reduced, the power supply stability of the power supply is improved, and the influence on the work of other devices is reduced.

The handheld low-power-consumption small alternating current constant current source comprises a power supply control module, an SPWM driving feedback module, a man-machine interaction module and an external mutual inductor test module, can generate 0-1A alternating current, has the overall power consumption within 50mW, can be powered by two No.5 dry batteries, can also be externally connected with a 5V power supply through a TYPE-C interface, and can be used for testing the power consumption of the power supply. One single-chip microcomputer is used for completing the functions of SPWM waveform calculation, current constant current feedback, mutual inductor parameter measurement, key pressing, display and the like.

The utility model relates to the technical field of chargers, and discloses a constant-current constant-voltage output control circuit, which comprises a reference voltage unit, a constant-voltage control unit and a constant-current control unit, the constant voltage control unit and the constant current control unit output corresponding voltage feedback signals or current feedback signals according to the output voltage of the charger and the reference voltage. And the duty ratio of a PWM control circuit of the charger is adjusted through the voltage feedback signal or the current feedback signal so as to stabilize the output voltage value or the current value of the charger. The constant-voltage and constant-current control circuit is simple in structure, constant-voltage and constant-current control of charging of the charger can be realized without using a single chip microcomputer, the production cost of the charger can be reduced, and the complicated mounting process and burning process of the single chip microcomputer can be saved, so that the production efficiency of the charger can be improved.

This disclosure relates to a charging method, apparatus, electronic device, and medium. The charging method includes: determining a target charging current for the battery; when the target charging current is greater than or equal to a first target current, simultaneously charging the battery using a first charging circuit and a second charging circuit; when the target charging current and the total output current are not the same, adjusting the first output current of the first charging circuit while keeping the second output current of the second charging circuit constant, wherein the total output current is the sum of the first and second output currents. By adjusting the total output current in a manner that adjusts the first output current while keeping the second output current constant, the adjustment of the first output current can prevent an imbalance in the electrical parameters of the second charging circuit from triggering charging protection, thereby improving the reliability of battery charging.

The present invention belongs to the field of ionizing radiation measurement, and discloses a portable micro-current constant current source device, which includes a spherical ionization chamber. The spherical ionization chamber includes a spherical metal shell and a collecting electrode located inside the spherical metal shell. The spherical metal shell is provided with a high-voltage electrode sealing interface. The outer side of the spherical metal shell is coated with an insulating coating. An incident window is opened at the bottom of the spherical metal shell. A radiation source box is provided at the bottom of the spherical metal shell. A radiation source facing the incident window is installed in the radiation source box. An F4 insulator is installed at the top of the spherical metal shell; the collecting electrode includes a first collecting ring, a second collecting ring and a current output terminal. The first collecting ring and the second collecting ring are connected at right angles. The top of the first collecting ring is connected to the current output terminal, and the current output terminal is led out from the center of the F4 insulator. This micro-current constant current source device can provide a stable current output.

The application relates to the technical field of power management, and discloses a configurable constant-current constant-voltage power supply system. The system comprises a voltage stabilizing unit, a current sampling unit, a voltage sampling unit, an analog-digital conversion unit and a processing unit. The current sampling unit converts output current into a voltage signal through a first resistor; the voltage sampling unit converts output voltage into a collectable voltage signal through a second resistor and a third resistor; the analog-digital conversion unit adopts two analog-digital converters to collect voltage signals of the first resistor and the third resistor respectively; the processing unit compares a constant-current value or a constant-voltage value set by a user and generates a control signal through a processing algorithm, and the output voltage of the voltage stabilizing unit is adjusted through a digital-analog converter. The application adopts a digital control scheme, a user can flexibly configure a working mode through software, has the advantages of high control precision, flexible parameter configuration and good stability, and is suitable for various application occasions requiring accurate current or voltage control.

The utility model discloses a battery charging constant-current constant-voltage circuit, which comprises a power interface, a constant-current circuit, a constant-voltage circuit and a battery pack, the power interface is used for being externally connected with a power supply; the constant current circuit is connected to the power interface and is used for limiting input current of an external power supply; the constant voltage circuit is connected to the constant current circuit and is used for stabilizing the output voltage and stabilizing the voltage within a rechargeable range of the battery pack; the battery pack is connected to the constant voltage circuit, is used for storing electric energy and carrying out charging and discharging management, and comprises a charging management circuit, a battery protection circuit and an electric quantity detection circuit. According to the scheme of the utility model, the thought that the current is set by the battery chip and the voltage is set by the voltage stabilizing source is ingeniously utilized, the power from the input source to the battery pack is effectively controlled, and a simple, applicable, reliable and flexible scheme is provided for application scenes in which small-power power supplies supply power to a system and continuously charge the system.

The invention provides a staged high-precision lithium battery pack equalization repair method in the technical field of lithium battery repair, which comprises the following steps of: S10, performing identity verification on equalization repair equipment through a visual interface; the method comprises the following steps of: acquiring input balance repair parameters including repair target voltage Vtarget, first repair current I1, second repair current I2, a repair voltage offset value Voffset and standing time T, and storing each balance repair parameter into a balance repair file, wherein the balance repair parameters comprise the repair target voltage Vtarget, the first repair current I1, the second repair current I2, the repair voltage offset value Voffset and the standing time T; step S20, collecting the initial open-circuit voltage Voc1 of each single battery cell by the equalization repair equipment, and when the Voc1 is less than Vtarget-Voffset, executing large-current constant-current charging; when Vtarget-Voffset is more than or equal to Vtarget and Voc1 is less than Vtarget, performing low-current constant-current charging; when Vtarget is larger than or equal to Vtarget and Voc1 is smaller than Vtarget + Voffset, low-current constant-current discharging is executed; when the Voc1 is larger than or equal to the sum of the Vtarget and the Voffset, large-current constant-current discharging is executed; and step S30, disconnecting the charging and discharging loop of each single cell to complete equalization repair. The method has the advantages that the precision and the safety of lithium battery pack equalization repair are greatly improved.

The application discloses a battery test system and a test method, wherein the system comprises an alternating-current constant-current excitation source, a master control unit and a plurality of independently arranged acquisition board cards; the alternating-current constant-current excitation source is connected to the first and last ends of a measured loop formed by a plurality of measured battery cells connected in series, is used for applying the same alternating-current constant-current excitation signal to all the measured battery cells, and simultaneously outputs a synchronous reference signal consistent with the alternating-current constant-current excitation signal to the plurality of independently arranged acquisition board cards; each acquisition board card is connected to only the sensing end of the corresponding measured battery cell, processes the sensing signal between the two ends of the corresponding measured battery cell, so as to obtain measurement data; and each acquisition board card reports the measurement data to the master control unit through a CANFD bus, and the master control unit collects and uploads the measurement data to an upper computer. The application realizes parallel and synchronous alternating-current internal resistance and direct-current open-circuit voltage test of a plurality of single battery cells in a series battery cell group, and improves the consistency and test efficiency of battery test.

The utility model discloses a kind of constant-current constant-voltage switching valves, it is characterized by including by two three-way valve bodies The six-way valve body, import passage and two mirror image settings export passage set on three-way valve body, valve rod movably installed in six-way valve body, connecting rod mechanism in the mirror image settings of valve rod two sides and the cam for driving connecting rod mechanism to act and switching flow path installed on valve rod. The utility model is switched by mirror image settings export passage and the setting of connecting rod mechanism, in the rotation process of being driven by rotating valve rod two to drive cam, the action of connecting rod mechanism is made by the pushing of cam to connecting rod mechanism, to export passage is switched, in switching process, the flow area of medium does not change, so that medium pressure does not produce fluctuation when switching, while medium pressure does not change, medium flow also does not change, to realize constant current constant voltage in switching process.

The utility model discloses a DC-DC (direct current-direct current) constant-voltage constant-current boosting electric vehicle charger. The internal circuit comprises a DC input and detection circuit, an input MOSFET TTP switch circuit, a boost circuit, an output filter circuit, an output battery voltage detection circuit, an LDO step-down circuit, an RX / TX one-wire communication input and output circuit, an OTP over-temperature protection circuit, an MCU control circuit, an output voltage control circuit and an output current control circuit. According to the DC-DC direct-current constant-voltage constant-current boosting electric vehicle charger, the input MOSFET TTP switching circuit, the direct-current boosting circuit, the MCU control circuit, the output voltage control circuit and the output current control circuit are designed, so that a power supply charger can be used on a direct-current charging pile with lower output voltage to quickly charge a high-voltage battery pack with higher voltage; in addition, the charging efficiency is high, the working performance is stable, and the charger is safer.

The present disclosure provides a modified silicon-carbon laminated lithium battery and its formation method. In the above-mentioned formation method, a highly elastic three-dimensional conductive mesh is formed in the silicon-based negative electrode sheet of the modified silicon-carbon laminated lithium battery, and it is a polymer diaphragm; the modified silicon-carbon laminated lithium battery injected with liquid is sequentially subjected to a first stage of low-temperature, low-voltage, small-current constant-current charging operation, a second stage of low-temperature, medium-voltage, medium-current constant-current charging operation, a third stage of high-temperature, high-voltage, large-current constant-current charging operation, and a fourth stage of low-temperature, high-voltage, large-current constant-current discharge operation, and finally a room-temperature static operation. The above-mentioned method enables the polymer diaphragm to change with the temperature change of the formation process, and the added highly elastic three-dimensional conductive mesh can effectively suppress the expansion and peeling problem of the silicon-based negative electrode of the high-energy, high-rate laminated lithium battery during the formation process, and also increases the elastic modulus of the negative electrode active material layer, reduces expansion deformation, and improves the cycle performance and high-rate performance of the modified silicon-carbon laminated lithium battery.

The application discloses a current fixed value setting method and device and electronic equipment. The method comprises the following steps: determining a set of operation scenarios of a power distribution network, and determining a set of system gears of a flexible interconnected device in the power distribution network; determining the fault current amplitude of a directional overcurrent protection device in the power distribution network under different fault categories according to the set of operation scenarios and the set of system gears; determining the fault current boundary of the directional overcurrent protection device under different fault categories according to the fault current amplitude; and determining the current fixed value corresponding to the directional overcurrent protection device according to the fault current boundary and a preset safety factor. The application solves the technical problem of low reliability of current fixed value setting due to the fact that the directional overcurrent protection setting method in the related art usually determines the fault current boundary based on a single working condition or an experience margin, and does not consider the operation uncertainty of the power distribution network and the flexible interconnected regulation capacity.

The invention provides a controller, a control method and a system for stable high-voltage output of an electrostatic spray gun. The control method comprises a constant-power output mode and a micro-current output mode. Whether the target current value is smaller than a set threshold value or not is judged, and if not, a constant-power output mode is operated; if yes, running a micro-current output mode; the micro-current output mode is provided with an output current constant current control algorithm module, and a sine pulse width modulation module and a current sampling module which are electrically connected; the sine pulse width modulation module is in signal connection with a high-voltage output module of the spray gun; the current sampling module sends sampling information to the output current constant current control algorithm module, and the output current constant current control algorithm module outputs an execution signal to the sine pulse width modulation module according to the sampling information and a target current value. And the sinusoidal pulse width modulation module generates a first sinusoidal signal and sends the signal to the high-voltage output module. The invention relates to a micro-current output control method which can realize stable output.

The utility model relates to the technical field of chip overvoltage protection, and discloses a step-down constant-current constant-temperature chip overvoltage protection device, which comprises a circuit board, a step-down constant-current constant-temperature chip is arranged on the upper surface of the circuit board, a chip connector seat is arranged on the upper surface of the circuit board, and the chip connector seat is electrically connected with a voltmeter. According to the overvoltage protection device for the step-down constant-current constant-temperature chip, the sliding plate moves leftwards in the axis direction of the long plate of the C-shaped frame, and when the sliding plate moves leftwards, the contact pieces on the C-shaped frame can be driven to move rightwards, so that the two contact pieces move away from each other to disconnect the connection of the chip connector base; therefore, the voltage-reducing constant-current constant-temperature chip can obtain effective overvoltage protection, the use stability of the voltage-reducing constant-current constant-temperature chip is improved, and the problem that the voltage-reducing constant-current constant-temperature chip is easy to damage when working for a long time under a relatively high voltage is avoided.

The application discloses a constant-current constant-voltage circuit and an electronic load for the electronic load, and relates to the technical field of electronic loads. The constant-current constant-voltage circuit comprises an MCU, a DAC module, a first error amplifier, a plurality of constant-current loops, a power supply end and a first differential amplifier, the plurality of constant-current loops are connected in parallel, the voltage or the current of the plurality of parallel constant-current loops is controlled through the DAC module and the first error amplifier, and the originally parallel circuit of a plurality of small closed loops is changed into the architecture of controlling small closed loops by a large closed loop. The plurality of constant-current loops are connected to the ground through a sampling resistor, the precision and the noise will not be affected by the measured power supply and overcurrent, and the sampling precision is high. The constant-current constant-voltage circuit has strong scalability, the number of the parallel constant-current loops can be infinitely stacked in theory, and is particularly suitable for the case of high voltage and small current.