11results about How to "Guaranteed sampling accuracy" patented technology

The application relates to the technical field of switch driving, in particular to a current sampling circuit for a high-side switch driving circuit, a chip and electronic equipment. The current sampling circuit comprises a second transistor, a third transistor, an operational amplifier and a voltage clamping circuit. The operational amplifier is used to work in a linear amplification state, so that the second electrode of the high-side switch tube and the second electrode of the second transistor are in a virtual short state. The voltage clamping circuit is used to collect a first voltage on the second electrode of the high-side switch tube, and output a voltage clamping signal when the first voltage is greater than a preset second voltage. The voltage clamping signal is used to clamp the voltage difference between the first electrode and the second electrode of the high-side switch tube to a preset third voltage. In this way, when the load current of the branch where the high-side switch tube is located is small, the offset voltage can be negligible compared with the third voltage, so as to reduce the influence of the offset voltage on the load current and ensure the sampling accuracy of the load current.

The utility model discloses a powder sampling device and a chemical vapor deposition system comprising the same, and relates to the technical field of sampling devices.The powder sampling device specifically comprises a sampling pipe, a gas-solid separation assembly and a sample bin, the sampling pipe is connected to the gas-solid separation assembly through a connecting gas pipe, and the gas-solid separation assembly is connected to the sample bin through a connecting gas pipe; the sample bin is connected to the gas-solid separation assembly through a material guide pipe; at least one sampling hole is formed in the sampling pipe at equal intervals, and a two-way valve is arranged at the sampling hole; or, the sampling tube is telescopic; or the sampling pipe is provided with two or more sampling pipelines with different lengths in parallel. The powder sampling device disclosed by the utility model is suitable for sampling the running state of the high-temperature furnace, can go deep into the furnace body, realizes on-line sampling of incapable sites in the furnace body, ensures the accuracy of a sampled sample, realizes monitoring of product quality in a powder production process, greatly improves the production efficiency of a production line, and improves the quality of a produced product.

This application provides a control method for a multi-channel selector for fuel cell voltage monitoring. When switching battery channels using at least one single-cell two-channel selection module, the equivalent output impedance of the channel to be switched is determined based on the current input impedance and historical internal resistance. Based on this equivalent output impedance, the target capacitance value and target capacitance level of the holding capacitor in the signal holder are determined. The holding capacitor is adjusted to the target capacitance level, and the charging current during charging and discharging is adjusted according to the target capacitance level. The actual charging and discharging time constant is determined based on the equivalent output impedance and the target capacitance value. The equivalent damping resistance of the signal holder is adjusted based on the actual charging and discharging time constant and the maximum charging and discharging time constant to match the maximum charging and discharging time constant. Through the above technical solution, precise control of the multi-channel selector is achieved.

The invention provides a control method of a multi-channel selector for fuel cell voltage inspection, and the method comprises the steps: determining the equivalent output impedance of a to-be-switched channel based on the input impedance and historical internal resistance at the current moment under the condition that cell channel switching is carried out through at least one single-cell two-channel selection module; based on the equivalent output impedance, determining a target capacitance value and a target capacitance gear of a holding capacitor in the signal holder, adjusting the holding capacitor to the target capacitance gear, and adjusting a charging current in a charging and discharging process according to the target capacitance gear; determining an actual charging and discharging time constant according to the equivalent output impedance and the target capacitance value; adjusting the equivalent damping resistance of the signal holder according to the actual charging and discharging time constant and the maximum charging and discharging time constant, so that the actual charging and discharging time constant is matched with the maximum charging and discharging time constant; by means of the technical scheme, accurate control over the multi-channel selector is achieved.

The embodiment of the application relates to the technical field of vehicles, and discloses a voltage sampling circuit, an operating method and device of the voltage sampling circuit, and a vehicle, a shunt, a voltage collection chip and a voltage regulating device. The shunt is used for being connected in series with a to-be-measured battery group. The voltage collection chip is connected with a first end of the shunt through a first sampling pin and connected with a second end of the shunt through a second sampling pin. The voltage regulating device is connected between the first end of the shunt and the first sampling pin of the voltage collection chip, and / or connected between the second end of the shunt and the second sampling pin of the voltage collection chip. The voltage regulating device is used for receiving a first differential voltage generated at two ends of the shunt, attenuating the first differential voltage, and outputting a second differential voltage. In this way, the influence of common-mode interference on current collection accuracy in the battery pulse heating process can be inhibited.

The invention relates to a current detection resistor and a manufacturing method thereof. The current detection resistor comprises a resistor disc, two cooling fins and an insulating sleeve, two electrode parts are arranged at the two ends of the resistor disc, each cooling fin comprises a connecting part, a transition part and a tilting part which are connected in sequence, the connecting part is attached to the single electrode part, the two cooling fins are separated, and the insulating sleeve is arranged between the two cooling fins. The middle part of the resistor disc and the transition parts and the upwarp parts of the two radiating fins are completely wrapped by the insulating sleeve; and the upwarp parts are closer to the outer wall of the insulating sleeve than the connecting parts. When the current detection resistor is used, the tilting part is separated from the resistor disc by a certain distance, so that the two surfaces of the tilting part have effective heat dissipation areas and can dissipate heat to the material of the insulating sleeve, and the upper surface of the tilting part is closer to the outer wall of the insulating sleeve, so that the heat can be quickly dissipated, and the current detection resistor can bear higher power under the same volume. The manufacturing method comprises the steps of raw material preparation, raw material bonding, in-mold injection molding and film coating. The current detection resistor is simple in structure, easy to install, low in cost and suitable for batch production.

The invention discloses an automatic solid and liquid sampling device for a production line, which relates to the technical field of sampling equipment and comprises a rack assembly, a swing arm moving assembly and a balance assembly. The rack assembly comprises a base, a stand column and a driving piece. The swing arm moving assembly comprises a first main arm, a second main arm, a swing part, a receiving hopper and an unloading part. One end of the swinging part away from the second main arm is connected with the driving part; the balance assembly comprises balance rod sets. The driving part rotates to drive the swing part to swing towards or away from the stand column, so that the receiving hopper is driven to move towards or away from the stand column, receiving or discharging operation is conducted after the receiving hopper moves, the levelness of the receiving port during receiving is kept through the balance rod set, sampling precision is guaranteed, manual sampling is completely replaced, and the sampling precision is high; direct contact between personnel and operation equipment is avoided, safety risks are remarkably reduced, the intrinsic safety level of a production line is improved, production efficiency is remarkably improved, and labor cost is reduced.

The utility model discloses a drilling and soil sampling device for soil detection, which relates to the technical field of soil detection and comprises a fixing plate and an adjusting plate, the surface of the fixing plate is in threaded connection with at least three adjusting threaded rods, and the bottoms of the three adjusting threaded rods are fixedly connected with rotating hand wheels. Spherical blocks are fixedly connected to the top ends of the three adjusting threaded rods, rotating blocks are fixedly connected to the positions, corresponding to the spherical blocks, of the bottom of the adjusting plate, the spherical blocks are rotatably connected to the interior of the rotating blocks, a sampling assembly is arranged in the middle of the upper surface of the adjusting plate, and a clamping assembly is arranged on the outer side of the upper surface of the adjusting plate. The bottom of the fixing plate is fixedly connected with three height adjusting assemblies. The device has the advantages that the sampling assembly can be kept in a parallel state relative to the ground, so that the sampling depth change caused by inclination of the device during sampling can be avoided, and the condition of soil at a specific layer can be accurately reflected during sampling each time.

The utility model relates to sampling device technical field discloses a new energy automobile gearbox lubricating oil sampling device, including base, the base inside fixedly connected with sampling bottle, the sampling bottle top is provided with connecting assembly, the sampling bottle top is provided with sealing assembly, the connecting assembly includes the first connecting ring fixedly connected in the sampling bottle top, the first connecting ring inside fixedly connected with spring, spring one end fixedly connected with the limit board, the limit board top abuts on the mounting sleeve, the mounting sleeve side wall is opposite and has been set up to install the groove, the mounting sleeve bottom is set up to have the sliding slot, the first connecting ring top abuts on the second connecting ring, in the utility model, through the structural setting of connecting assembly, have solved the sampling bottle and the oil pipe fixed connection assembly in the prior art, when the sampling bottle or the oil pipe is damaged, the problem that the damaged component cannot be separated from the device whole quickly.

The invention provides a voltage control and detection circuit, a power conversion device and a charging pile, and belongs to the technical field of circuits. A detection voltage output by an operational amplifier circuit in the voltage control and detection circuit can reflect an error between a reference voltage and an output partial voltage, so that a control circuit realizes closed-loop control of the output voltage of the DC / DC conversion circuit based on the detection voltage. Moreover, the detection voltage can reflect the magnitude of the ripple voltage in the output voltage, so that the control circuit achieves ripple suppression of the output voltage. The voltage control and detection circuit has abundant functions, and can effectively avoid increasing the structural complexity and cost of the power conversion device. Moreover, the operational amplification circuit has a proportional amplification function and can amplify the voltage difference between the reference voltage and the output divided voltage, so that the sampling precision of the voltage can be ensured even if a high-resolution ADC (Analog to Digital Converter) is not used. Therefore, the dependence on the high-resolution ADC is effectively reduced.

The utility model relates to the field of soil sampling, in particular to an environmental soil sampler which adopts the technical scheme that the environmental soil sampler comprises a fixed table and an outer cylinder, a first spiral blade is mounted on the outer wall of the lower end of the outer cylinder, a sampling rod is mounted in an inner cavity of the outer cylinder, a drill bit is mounted at the lower end of the sampling rod, and a protection component is mounted at the lower end of the fixed table and positioned outside the outer cylinder; the utility model has the beneficial effects that when the whole outer cylinder is rotated to drill into the ground, the bottom of the outer cylinder firstly drills into the ground through the drill bit, after the required depth is drilled, the rotation of the outer cylinder can be stopped, then the sampling rod is rotated to descend and extend out of the outer cylinder, and when the sampling rod descends, the drill bit is driven to synchronously move, so that the drill bit is separated from the bottom of the outer cylinder; along with the movement of the sampling rod, the sampling rod drills through a second spiral blade on the surface, so that a sampling hole in the surface of the lower end of the sampling rod leaks out, and when the sampling hole leaks out, soil at the bottom of the outer cylinder enters the sampling rod through the sampling hole, so that the sampling precision is ensured.