41results about How to "Realize overcurrent protection function" patented technology

The invention discloses a compact type insulated gate bipolar transistor (IGBT) module driving unit. The compact type IGBT module driving unit comprises a power board, a driving core board and a driving adaptive board, wherein a control protection circuit is arranged on the driving core board, a driving circuit is arranged on the driving adaptive board, and the power board, the driving core board and the driving adaptive board are connected in sequence through a cable or connecting terminals. According to the compact type IGBT module driving unit, a power module is independently arranged, core circuits of control protection and the like of an IGBT module are placed in the driving core board, the driving circuit is placed in the adaptive board, and only a corresponding module adaptive board needs to be changed so as to correspond to IGBT modules of different manufacturers and different model numbers. The core board can be connected with module adaptive boards of various model numbers, so that the aim of being in common use is achieved. A temperature measurement circuit, an electric current measurement circuit and a control protection circuit are designed to be in the same driving core board, wherein the temperature measurement circuit, the electric current measurement circuit and the control protection circuit are arranged in a dispersed mode, so that compactibility is achieved. Optional functions such as overheating protection, short pulse suppression and weak light protection are arranged, so that flexible smart configuration is achieved.

The invention relates to novel automatic cleaning equipment for zinc-silver batteries. The novel automatic cleaning equipment for the zinc-silver batteries comprises boric acid water flushing module used for flushing away dirt on the surfaces of the batteries, a grabbing and transferring module used for transferring the batteries from one station to the next station, a clear water rinsing module used for flushing away residual dirt and boric acid, a brush washing module used for assisting in washing, a water-blowing air-drying module used for blowing away residual water on the surfaces of the batteries, a sponge wiping module used for wiping the surfaces of the batteries, a drying module used for drying the batteries, and an electrical module used for providing working control commands and power for all the other modules. According to the novel automatic cleaning equipment for the zinc-silver batteries, circuits and electrical connection are modular, sectional design according to functions is achieved on the aspect of structural design, and automation and intellectualization of a system are achieved; an alarm function is achieved through a human-computer interaction interface and an indicator light; and full-automatic cleaning of the zinc-silver batteries can be achieved efficiently and rapidly, the cleaning effect is good, and the safety performance is high.

The invention discloses an IGBT (Insulated Gate Bipolar Translator) short circuit protection detection circuit based on a driving chip. The detection circuit comprises an isolated driving circuit, wherein the isolated driving circuit comprises an isolated driving chip and a second resistor; the output pin of the isolated driving chip is connected with one end of the second resistor; the other endof the second resistor is connected with the base of an IGBT to be detected; the isolated driving chip further comprises an input pin and an overcurrent detection pin DESAT; the input pin is connected with a PWM (Pulse-Width Modulation) driving signal of a host; the overcurrent detection circuit comprises a first resistor, a first voltage regulator tube and a first diode; the overcurrent detection pin DESAT is connected with one end of the first resistor and the cathode of the first voltage regulator tube respectively; the other end of the first resistor is connected with a positive power supply; the anode of the first voltage regulator tube is connected with the cathode of the first diode; and the anode of the first diode is connected with the collector of an IGBT to be detected. The detection circuit has high IGBT short circuit protection reliability, a simple structure and high portability.

The utility model discloses a method of program download which is provided with the interface terminal of joint test action group (JTAG). The method comprises the pre-set function on the download equipment when the power is on as well as the following procedures, namely, to equip and ascertain the working voltage of the JTAG interface terminal and the operating level of the JTAG interface, to make the download equipment supply power for the terminal, to initialize the terminal, to set the processor of the terminal in motion, to set the memory of the terminal into the regular read and write condition, to complete the download of the plug-in and to download the program code. The utility model can not only realize the program download, but reduce the high cost of emulator as well.

The invention discloses a fault protection device for a flexible DC (Direct Current) transmission system of a wind power plant and belongs to the technical field of wind power generation. The device comprises a current limiting and smoothing device, a buffer protector, a main loop switch, an unloading loop, an unloading switch and a power diode. One end of the current limiting and smoothing device is connected with a DC output end of a sending end station and the other end is respectively connected with the buffer protector and the unloading loop; the other end of the buffer protector is connected with the main loop switch; the other end of the main loop switch is respectively connected with a DC transmission line and the diode; the other end of the unloading loop is respectively connected with the unloading switch and the power diode; and the other end of the unloading switch is earthed. The fault protection device is capable of protecting the wind power plant when over-current and over-voltage faults and voltage fluctuations occur in the DC transmission line at any wind velocities; the fault protection device has the advantages of being low in cost, less in loss, high in cost performance and the like; and the reliable and safe operation of the flexible DC transmission system of the wind power plant is ensured.

The invention relates to an overcurrent protection device for medium-frequency asynchronous motors. Input ends of two relays are connected into two phases of a three-phase power source AC together, and output ends of the two relays are connected into a motor M and opposite to each other. Another phase in the three-phase power source AC is connected into the motor M through a sampling end of a current transformer L, a sensing end of the current transformer L is connected with a sampling resistor R and a positive electrode of a voltage comparator S after passing a rectifying diode P, sources of N-channel MOS (metal oxide semiconductor) transistors are connected with the power source, drains are respectively connected with the two relays, and grids are respectively connected with a control wire of the motor M and an anode of a thyristor J. A gate of the thyristor J is connected with an output end of the voltage comparator S. The overcurrent protection device for medium-frequency asynchronous motors realizes the overcurrent protection function for medium-frequency asynchronous motors, and is applicable to various medium-frequency asynchronous motors different in specifications and operating environments by adjusting parameters of components, low in operating limits and long in service life.

The invention provides an NMOS power tube gate driving module, a driving circuit and a switching power supply, and relates to the technical field of switching power supplies, and the NMOS power tube gate driving module is realized by adopting a transistor integrated circuit process. The internal circuit of the NMOS power tube gate driving module is simple, and the NMOS power tube gate driving module is suitable for a switching power supply driving circuit and a boost switching power supply. By quickly opening and closing the NMOS power tube, the problem of large opening and closing loss when the NMOS power tube is applied to a switching power supply chip is solved, and the NMOS power tube gate driving module has an over-current detection function and has the advantages of simple structure, low cost and high reliability.

The invention discloses an intelligent electric assisting turning controller for a cargo carrier. The intelligent electric assisting turning controller is characterized by comprising a microcontroller, a motor managing circuit, an outer power control circuit, a working state indicating circuit, a steering wheel sensor circuit, a central positioning sensor circuit, a power managing circuit, an EEPROM memory circuit and a host computer communication interface circuit, wherein the motor managing circuit, the outer power control circuit, the working state indicating circuit, the steering wheel sensor circuit, the center positioning sensor circuit, the power managing circuit, the EEPROM memory circuit and the host computer communication interface circuit are correspondingly connected with the microcontroller.

The invention discloses a multi-path synchronous control multifunctional vacuum circuit breaker, and the circuit breaker comprises a manual switch, an overcurrent protection mechanism, a plurality ofvacuum switch actuating mechanisms and a plurality of overcurrent triggering mechanisms; each vacuum switch actuating mechanism comprises a vacuum cavity, and a wire inlet end static contact, a wire outlet end static contact and a moving contact are arranged in each vacuum cavity; the moving contacts of the plurality of vacuum switch actuating mechanisms are driven by a manual switch and a drivingpiece of the overcurrent protection mechanism, the vacuum switch actuating mechanisms further comprise first permanent magnets which are arranged outside the vacuum cavity and can drive the moving contacts to move linearly through magnetic force, and the first permanent magnets are provided with magnet center holes. A driving piece of the manual switch and overcurrent protection mechanism is a rotating shaft, and the rotating shaft penetrates through magnet center holes of the first permanent magnets of the plurality of vacuum switch execution mechanisms. The rotating shaft is adopted as a driving part of the manual switch and the overcurrent protection mechanism, the occupied space is smaller, and miniaturization design and accurate control of the whole circuit breaker are facilitated.

The invention provides an overcurrent protection method of a PMSM driver, and belongs to the technical field of motor equipment. The method comprises the steps that 1) when a PMSM M operates normally, a microcontroller U uses an internal counter to detect and record time D between adjacent zero-crossing points of any two phases of currents in real time; 2) when overcurrent or other emergency state occurs in the PMSM M and the PMSM needs shutdown, the microcontroller U uses a current sensor L to detect current states of phases A, B and C, and control ON/OFF states of switch tubes Q1 to Q6; and 3) the connected switch tubes are switched off at time D2 from the moment that overcurrent or other emergency state occurs in the PMSM M and the PMSM needs shutdown, D2=3D/2-D1, and thus, overcurrent protection for the motor driver is realized. Thus, voltage pumping-up of a bus capacitor of the motor driver can be substantially reduced, lower than 10% of the original, and even eliminated, and the safety of the driver can be protected in emergency states as overcurrent.

An embodiment of the invention discloses an LED driving circuit compatible to different types of ballast. The LED driving circuit comprises two rectification circuits, a filter circuit, a high-voltage absorption circuit and an LED constant-current circuit. The filter circuit, the high-voltage absorption circuit and the LED constant-current circuit are sequentially arranged at output ends of the rectification circuits in a parallel connection manner, input ends of the filter circuit, the high-voltage absorption circuit and the LED constant-current circuit are connected with the output ends of the rectification circuits, and the rectification circuits are used for rectifying output or AC input of the electronic ballast and the inductance ballast; the filter circuit is used for filtering output of the rectification circuits; the high-voltage absorption circuit is used for absorbing high voltages when the high voltages are outputted by the electronic ballast; the LED constant-current circuit is used for providing constant-current voltages required when LED load works.

The invention discloses a battery management system with hybrid switching devices capable of being expanded in parallel. The battery management system comprises a bus control unit and a branch line control unit. The bus control unit comprises a main controller and a first switch module; the branch control unit comprises a battery module, a second switch module, a branch controller and a detection module; the branch line controller is connected with the main controller, and the branch line controller uploads acquired battery physical information to the main controller; and the main controller issues a control instruction to the branch line controller according to the acquired information. According to the invention, the main controller obtains the state and the signal of the branch line controller, carries out judgment through detecting the collected information, and controls the on-off state of the power supply main loop; meanwhile, the branch line controller can control the on-off state of the battery module through the second switch module according to the detected information so that the battery management system has double guarantees, and the safety is improved.

The invention discloses a clean and sanitary electric window which comprises a cover, a shutter sheet group, tracks, a motor and a reel pipe. The motor and the reel pipe are mounted in the cover, one end of the shutter sheet group is mounted on the reel pipe, a tail plate is arranged at the other end of the shutter sheet group, and the shutter sheet group comprises a plurality of shutter sheets which are hooked with one another; the tracks comprise inner tracks and outer tracks, the shutter sheet group is mounted in the inner tracks, and extension springs are arranged in the outer tracks. The clean and sanitary electric window has the advantages that effects of cleaning the window can be realized by the aid of roller shutter windows on the premise that work of the existing roller shutter windows is unaffected, accordingly, wastage of human resources can be reduced, the clean and sanitary electric window is safe and reliable, and high requirements of people can be met; high-gain operational amplifiers are used as voltage comparison elements for power supply circuits for the motor and electric telescopic rods and are combined with triodes, so that the clean and sanitary electric window has output voltage stabilization and over-current protection functions.