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

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 invention discloses an intelligent power supply device for a power distribution automation terminal and a battery evaluation method. The device includes an AC input module, a communication module, a display module, an alarm module, a monitoring control module, a battery management module and a power output module. The monitoring The control module is respectively connected with the AC input module, the communication module, the display module, the alarm module, the battery management module, and the power output module, and the power output module is respectively connected with the AC input module and the battery management module; the AC input module, the communication module , alarm module, battery management module and power output module are all externally connected with wiring ports. Through the cooperation of the battery management module and the monitoring and control module, the present invention can realize a powerful battery management function, which is beneficial to the normal operation of the power distribution automation terminal, and through the cooperation of the monitoring and control module and the display module, it can realize the functions of event recording and searching.

The invention discloses an overcurrent protection circuit and a switching power supply chip, which are used to protect the power tube inside the switching power supply chip, including a reference current source module, an overcurrent detection module and an oscillator module; When the current of the power tube reaches the overcurrent protection point, the triode in the overcurrent detection module is turned on, and charges the energy storage capacitor in the oscillator module, increasing the charging current of the energy storage capacitor to make the energy storage capacitor The voltage of the energy storage capacitor accelerates to the preset value. When the voltage of the energy storage capacitor reaches the preset value, the rectangular wave output by the oscillator module turns to a high level, and the driving circuit module in the switching power supply chip receives this high level. After the power level signal is turned off, the power transistor inside the switching power supply chip is driven to be turned off to realize overcurrent protection. The invention is suitable for switching power supply chips using power triodes and power MOS tubes as switching tubes, and meets the overcurrent protection requirements of buck-type and boost-type switching power supply chips.

The invention discloses a method and system for detecting and suppressing the DC component of transformer current, belonging to the technical field of power supplies, including a sampling unit, a sampling conditioning circuit, a main control unit and a driving circuit, and solving the problem of suppressing DC based on the detected DC component of transformer current. The technical problem of the component can prevent the device from being damaged due to the saturation of the transformer. The present invention can omit the DC blocking capacitor connected in series in the transformer circuit in the prior art solution. Since the greater the power, the higher the volume and cost of the DC blocking capacitor, the current detection CT and detection The resistor has small volume and low cost, so the present invention has more advantages in product volume and cost.

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.

Provided is a controllable and adjustable space computer instruction power supply current-limiting protection circuit. When overcurrent comes, an output current regulating circuit is started to adjust a start voltage of an instruction power supply electronic switch, thereby realizing an over-current protection function for a space computer instruction power supply; when instruction load has fault or is short circuited, the output current of the instruction power supply can be limited within a safety range; by adjusting a current sampling circuit, overcurrent protection points can be set to meet different space computer load requirements; after over-current factors are eliminated, acquisition voltage on the current sampling circuit gets smaller, the instruction power supply electronic switch is allowed to restore to normal opening and closing autonomously, and function and performance of a space computer are not influenced, thereby ensuring that a drive circuit is not burnt out under the condition of short circuit of the spacecraft instruction load; and instruction power supply and instruction signals can be released synchronously, thereby preventing long-time power up of the power supply, preventing release of wrong instructions under an idle state and ensuring safety of the spacecraft instruction power supply link.

The invention provides an electric heating plug driving and protecting circuit of a diesel engine air inlet heating device. The circuit comprises a micro-controller, wherein a PWM output port of the micro-controller is in signal connection with the input end of a level conversion and over-current turn-off circuit; the output end of the level conversion and over-current turn-off circuit is in signal connection with the input end of the power drive circuit, the output ends of the power driving circuit are correspondingly in signal connection with an electric heating plug and a current sampling circuit; and the output ends of the current sampling circuits are correspondingly connected to the A / D input port of the micro-controller and the input end of an over-current detection circuit, and theoutput ends of the over-current detection circuit are in signal connection with an interrupt input port of the micro-controller and the input end of the level conversion and over-current turn-off circuit. According to the electric heating plug driving and protecting circuit of the diesel engine air inlet heating device, a software interrupt and hardware turn-off technology is adopted, so that when over-current occurs, the circuit can be reliably switched off, and the over-current protection function of the load is realized.

The invention discloses an intelligent electric power steering controller for cargo handling vehicles, which is characterized in that it includes a microcontroller, a motor management circuit, an external power supply control circuit, a working state indication circuit, a steering wheel sensor circuit, a center positioning sensor circuit, Power management circuit, EEPROM storage circuit, upper computer communication interface circuit, the motor management circuit, external power supply control circuit, working status indication circuit, steering wheel sensor circuit, center positioning sensor circuit, power management circuit, EEPROM storage circuit, upper computer The communication interface circuits are respectively connected with the microcontroller.

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 provides a laser power supply overcurrent protection circuit with a locking function, which relates to a power supply overcurrent protection circuit. The laser power supply overcurrent protection circuit is provided with a current sampling conversion circuit, a protection current rated value setting device, a comparing control circuit, a function transformation circuit and a loop current regulating tube, wherein the output end of the current sampling conversion circuit and the output end of the protection current rated value setting device are connected with the input end of thecomparing control circuit; the output end of the comparison result control signal of the comparing control circuit is connected with the input end of the function transformation circuit; the output end of the function transformation circuit is connected with the loop current regulating tube; and the loop current regulating tube is controlled to realize the safe and reliable overcurrent protectionfunction of purpose that the whole loop is in an indirectlynot switchinged off waydirectly, thereby achieving a safe and reliable overcurrent protection function. The invention can effectively realize the overcurrent protection function of the laser power supply driving current and can enable the driving current to be locked at the set rated value when the overcurrent occurs, thereby realizing the locking function of the laser power supply overcurrent protection circuit and avoiding the inconvenience caused brought by directly switching off the driving current in the commonusual overcurrent protection circuit.