Abstract: The present invention relates to a preparation and purification method for cationic quaternary ammonium salt of sodium hyaluronate in homogeneous medium. By adding a homogeneous solvent and a sodium hyaluronate solid to a vessel, heating the vessel until the contents are dissolved to form a homogeneous system, adding an aqueous solution of 2,3-epoxypropyltrimethylammonium chloride (GTA) to the homogeneous system, then adding a base catalyst, and stirring at a preset temperature to carry out a graft reaction, a graft product is obtained wherein 2,3-epoxypropyltrimethylammonium chloride is grafted to the oxygen atom of the hydroxymethyl group of sodium hyaluronate. By using the method, a graft product wherein 2,3-epoxypropyltrimethylammonium chloride is grafted to the oxygen atom of the hydroxymethyl group of sodium hyaluronate is obtained. Addition of salts is avoided during the reaction, a grafting yield up to 0.69 is obtained, and coagulation occurred to the product is effectively solved.

Abstract: The present disclosure relates to a mosquito-killing lamp, including a shell. The shell is provided with a fan, an air inlet, an air outlet, a manual operation open-close mechanism, and an installation cavity and a mosquito storage cavity that are cut through. The air inlet, the installation cavity, the mosquito storage cavity, and the air outlet constitute an air duct; mosquitoes enter the mosquito storage cavity from the air inlet when the manual operation open-close mechanism is in opened state, and mosquitoes are prevented from flying from the mosquito storage cavity to the installation cavity when the manual operation open-close mechanism is in the closed state. The present disclosure has the advantages that mosquitoes fly out hardly, and the mosquito-killing effect is better.

Abstract: The present invention relates to a mosquito killer, including a mounting base and a mosquito-killing bat unit, wherein the mosquito-killing bat unit, a handle portion and a movably arranged locking piece; and when a mosquito-killing portion of the mosquito-killing bat unit is inserted into an accommodating cavity of the mounting base, the mounting base drives a locking piece to move and unlock the handle portion, and the handle portion may be turned over to one side of the mounting base. By adoption of the above solution, when the mosquito-killing bat unit is arranged on the mounting base or is used singly, the handle portion of the mosquito-killing bat unit may be turned over for storage.

Abstract: A charge wake-up circuit for a battery management system (“BMS”) for an electric vehicle, the circuit including a charging plug connection circuit, a comparator circuit, and a DC wake-up circuit. The charge wake-up circuit monitors the state of the charger after the BMS turns off. If the charger charges the battery pack after the BMS turns off, the BMS will be started by the charge wake-up circuit and continue to monitor the battery pack. If the charger is off-line, the BMS will maintain the low-power state to prevent the automotive lead-acid battery from over-discharging.

Abstract: A charge wake-up circuit for Battery Management System (BMS). The circuit includes the charge-discharge module and charge detection module. The charge-discharge module contains Charger W, load R1, first switch K1, second switch K2, battery E, charge MOSFET M1 and discharge MOSFET M2. The charge detection module contains inductance L 1, first diode D1, second diode D2, first resistor R2, second resistor R3, third resistor R4, fourth resistor R5, fifth resistor R6, sixth resistor R7, seventh resistor RS, first capacitor C1, second capacitor C2, third capacitor C3, first transistor Q1, second transistor Q2 and photocoupler U.

Abstract: This invention involves a battery short-circuit protection circuit installed in a battery-load circuit. In the battery-load circuit, there is a battery and a load RL. The battery and RL form a circuit. The two ends of the battery are positive discharge end P+ and negative discharge end P?, respectively. The battery short-circuit protection circuit is in series with the battery-load circuit. The battery short-circuit protection circuit includes a charge-discharge circuit, a current amplifier circuit, and a current comparator circuit. The charge-discharge circuit includes MOS transistors and a sampling resistor. The current amplifier circuit includes a signal conditioning circuit and a current amplifier. The current comparator circuit includes a current comparator, a current reference circuit for short-circuit protection consisting, a MOS transistor, a diode, a resistor, and an optronics relay.

Abstract: A charge wake-up circuit for a battery management system (“BMS”) for an electric vehicle, the circuit including a charging plug connection circuit, a comparator circuit, and a DC wake-up circuit. The charge wake-up circuit monitors the state of the charger after the BMS turns off. If the charger charges the battery pack after the BMS turns off, the BMS will be started by the charge wake-up circuit and continue to monitor the battery pack. If the charger is off-line, the BMS will maintain the low-power state to prevent the automotive lead-acid battery from over-discharging.

Abstract: This invention involves a battery short-circuit protection circuit installed in a battery-load circuit. In the battery-load circuit, there is a battery and a load RL. The battery and RL form a circuit. The two ends of the battery are positive discharge end P+ and negative discharge end P?, respectively. The battery short-circuit protection circuit is in series with the battery-load circuit. The battery short-circuit protection circuit includes a charge-discharge circuit, a current amplifier circuit, and a current comparator circuit. The charge-discharge circuit includes MOS transistors and a sampling resistor. The current amplifier circuit includes a signal conditioning circuit and a current amplifier. The current comparator circuit includes a current comparator, a current reference circuit for short-circuit protection consisting, a MOS transistor, a diode, a resistor, and an optronics relay.