5results 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.

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 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 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.