37results about How to "Reduce heat source" patented technology

The invention discloses a load driving device, comprising a voltage-stabilizing and current-stabilizing main circuit, a sampling unit and an output current controller, wherein the voltage-stabilizing and current-stabilizing main circuit is used for converting input voltage and providing electric energy for a post-stage load unit under the control of the output current controller, the sampling unit is connected with the output terminal of the voltage-stabilizing and current-stabilizing main circuit and is used for sampling output characteristic parameter of the voltage-stabilizing and current-stabilizing main circuit; and the output current controller is used for controlling a current-limiting point of the voltage-stabilizing and current-stabilizing main circuit, a steady state operating point of the voltage-stabilizing and current-stabilizing main circuit is determined according to regulating direction of the current-limiting point and variation of the output characteristic parameter of the voltage-stabilizing and current-stabilizing main circuit before and after being regulated, and the voltage-stabilizing and current-stabilizing main circuit is controlled to operate at the steady state operating point. The load driving device disclosed by the invention can improve reliability of a driver; meanwhile, complexity of the circuit can be reduced. The invention also discloses a control method and device.

Disclosed are an electric motor and an electric vehicle having the same. The electric motor includes a stator including a stator core and a stator coil wound around the stator core, a rotor disposed to be rotatable with respect to the stator, and a cooling unit configured to allow a cooling fluid to flow therein and disposed to be in contact with the stator to cool the stator, wherein an outer surface of the stator core includes grooves in which the cooling unit is inserted. Cooling performance can be enhanced by shortening a heat transmission path, and the cooling unit can be easily fabricated and coupled.

A load driving device and system, and a limiting point control method and device. The load driving device comprising: a voltage / current regulative main circuit placed under the control of an output current controller, for use in conducting a voltage conversion on an input voltage, and in supplying electric power to a subsequent load unit; a sampling unit connected to an output terminal of the main circuit, for use in sampling an output feature parameter of the main circuit; the output current controller, for use in controlling a limiting point of the main circuit, and on the basis of the adjustment direction of the limiting point and on changes of the output feature parameters of the main circuit before and after an adjustment, determining a steady working point for the main circuit, and controlling the main circuit to work at the steady working point. The load driving device and system enable an increase in driver reliability and a reduction in circuit complexity.

The invention relates to a preparation method of a spraying composition of influenza vaccine. The composition contains influenza virus antigens and drug-acceptable carriers which are chosen from interferon, ion exchange resins, human serum albumin or phosphate buffer.

A high-frequency half-wave rectifier system of low-harmonicity and high-efficiency, which mainly comprises: a current output device having an output end and a first flow-return end respectively at both ends, a rectifying module, a resonant tuning unit, a first node, a voltage regulator module, at least one load element, a grounding portion, and at least one flow-return path. By means of the above structure, a simple circuit configuration and appropriate capacitance value setting are used to control the duty cycle of the rectifying module to approximately 74 nanoseconds and adjust the output power and improve the AC to DC conversion efficiency for the rectifying module under the low electromagnetic interference condition.

The invention relates to a power supply source control device for aircraft, which belongs to the field of aviation electrics, and includes a casing, a generator arranged in the casing, an excitation control module, an excitation storage battery, a current-limiting insurance 5A, and a main control device arranged outside the casing ;The main control device includes battery interface, ground power interface, relay J1~relay J3 and bus bar; the coils of relay J1 and relay J2 are connected in parallel between the battery interface and ground, and the normally open contact J1‑1 of relay J1 is connected to the bus The bus bar is connected to the coil of the relay J3 and one of the power terminals of the bus bar is connected to the excitation control module through the excitation control protection switch K1; the excitation control module is connected to the corresponding pin of the generator, the excitation battery and the working indicator light L It is connected in series with the current-limiting fuse 5A and then connected to the power supply terminal of the excitation control module; the positive pole of the power supply of the generator is connected to the normally open contact J3-1 of the relay J3 through the switch S1. The invention has the advantages of low cost, high reliability, good heat dissipation and safety and stability.

The invention discloses glycopyrronium bromide injection and a preparation method thereof. The preparation method disclosed by the invention comprises the following steps of: (1), adding 50-90% of injection water into a preparation tank, adding sodium chloride, adding a pH adjusting agent after dissolving to adjust the pH value to 1.0-4.0, and then, diluting to total weight by adding injection water to obtain solution A; (2), adding glycopyrronium bromide into the solution A at the constant temperature of 30-40 DEG C, stirring till dissolving completely, crudely filtering in a filtrate tank through a milliporous filtration membrane which is 0.45 mu m, and finally filtering through a milliporous filtration membrane which is 0.22 mu m to obtain an intermediate product; (3), filling the filtrate tank into a neutral boron-silicon container, sealing, and sterilizing through steam at 115-121 DEG C for 8-30 min to obtain the glycopyrronium bromide injection. The glycopyrronium bromide injection disclosed by the invention has the characteristics of being good in stability, high in safety and the like.

The invention discloses a cutting frequency conversion control device for a cantilever-type coal mine heading machine and a control method of the cutting frequency conversion control device. The device comprises a pre-charging and switching unit, an input reactor, a rectifier, an intermediate DC loop, an inverter, a controller and a sensor unit, wherein the output end of the pre-charging and switching unit is used for supplying power to a heading motor of the cantilever-type coal mine heading machine sequentially through the input reactor, the rectifier, the intermediate DC loop and the inverter, and the output end of the controller is connected with a controlled end of the inverter. The method comprises the following steps of: judging whether regenerative braking is required or not, generating a negative torque closed-loop control quantity by taking the voltage of the intermediate DC loop as a feedback quantity when the regenerative braking is required, and outputting the negative torque closed-loop control quantity to the inverter so as to control a motor to consume regenerative energy. The cutting frequency conversion control device and the control method thereof have the advantages that the regenerative energy can be consumed in no need of a chopper circuit, the material cost can be saved, the installation space is reduced, the cooling of an electrical cabinet of a frequency converter is improved, and convenient construction is achieved.