40results about How to "With overvoltage protection function" patented technology

The present invention belongs to the technical field of power electronics, in particular to an IGBT drive and protection circuit which can effectively realize power-down protection and can not be switched on by mistake. The IGBT drive and protection circuit comprises a common-emitter amplifying circuit, and a push-pull drive circuit and IGBT, wherein the common-emitter amplifying circuit is provided with a PWM signal input terminal for amplifying PWM signals, and the push-pull drive circuit is provided with a VDD power supply input terminal for receiving power from a VDD power supply. An NPN triode is connected between the common-emitter amplifying circuit and the PWM signal input terminal. The PWM signal input terminal is led out from the emitter; a base electrode of the terminal is provided with a VCC power supply input terminal through a resistor for receiving power from a VCC power supply; and a collecting electrode of the terminal is connected with the VDD power supply input terminal through a resistor. The IGBT drive and protection circuit has functions of power-down protection, gate protection and overvoltage protection for collecting electrodes, and is stable and reliable.

The invention discloses a hardware-in-loop test platform for a new energy vehicle power battery management system. A battery cell simulation unit of the hardware-in-loop test platform is used for sending battery cell electrical failure mode configuration information to a battery cell electrical failure injection unit under the control of a computer; the battery cell electrical failure injection unit is used for inputting the battery cell electrical failure mode configuration information into a measured BMS controller so that the measured BMS controller is used for carrying out a correspondingbattery cell electrical failure mode test; an I/O signal electrical failure injection unit is used for inputting I/O signal failure configuration information into the measured BMS controller under thecontrol of the computer so that the measured BMS controller is used for carrying out a corresponding I/O signal failure test of the measured BMS controller. Complete hardware-in-loop automated testing, including full-function testing of a main board and a slave board, of the battery management system can be realized, so that the reliability of the battery management system is improved.

The invention provides a control circuit of a low-voltage reactive compensation device. The control circuit of the low-voltage reactive compensation device comprises a control module, a power supply module, an HCI (Human-Computer Interaction) module, a collection module, a data storage module, a communication module, a switching control circuit, a zero passage switching module and a protection alarm module, wherein the control module is respectively connected with the power supply module, the HCI module, the collection module, the data storage module, the communication module, the switching control circuit and the protection alarm module, and the switching control circuit is sequentially connected with the zero passage switching module and a capacitor. A distribution network system is partitioned according to a voltage value and a reactive power value, the existing nine-zone diagram is improved, and a reactive compensation device can be compensated by a controller according to the improved nine-zone diagram. According to the control circuit disclosed by the invention, the problem that frequent switching is easy to cause in the traditional nine-zone diagram control is overcome, and the control circuit has the advantages that the cost is low, the application is flexible, and the fast and accurate switching of the capacitor can be realized.

The invention relates to an intelligent-control multifunctional multi-type energy-storage-battery quick charging system. The system is composed of a main circuit and subcircuits. The main circuit comprises a single chip microcomputer, a voltage input circuit, a power source circuit, an oscillating circuit, a keyboard input and display alarm circuit, a signal collection processing circuit and a signal output circuit, wherein the power source circuit is further connected with the subcircuits. Compared with the prior art, the system has the advantages that the functions of leakage detection, heat management, battery equalization management, alarm reminding, surplus capacity calculation, discharger power, SOC, SOH and DOD state reporting are achieved for batteries; the system has the functions of overvoltage protection, battery heat management and the like; corresponding charging methods are designed for different types of energy storage batteries, so that all types of the energy storage batteries can be charged under the optimal charging methods; the function of controlling the maximum output power and other functions can further be achieved for electric cars and the system further has the advantages of being simple in device, small in size, light in weight, quick in reaction speed, low in cost, long in service life and the like.

A high temperature high pressure enclosed counteraction apparatus applied in chemical analyzing instrument and counteraction the method thereof. The apparatus is characterized in that: it comprises a counteraction pool, a compacting and fixing mechanism, an excess-temperature protecting device and a temperature sensor; the compacting and fixing mechanism includes a compaction knob, an inner knob, a spring, a pressure head, a fixing part, a guide rod, an upper portion high pressure electromagnetic valve, a lower portion high pressure electromagnetic valve, a fixed supporting side plate and a transparent protective cover; wherein, the compaction knob, the inner knob, the spring, the pressure head, the fixing part, the guide rod and the upper portion high pressure electromagnetic valve compose an upper compaction mechanism; the fixed supporting side plate and the transparent protective cover compose a central coupling and supporting mechanism; and the lower portion high pressure electromagnetic valve composes a lower counteraction pool pedestal.

The invention discloses a voltage peak control circuit applied to a DC-DC converter. The voltage peak control circuit comprises a DC power supply, a DC-DC chopper circuit, a filter capacitor, an RS trigger, a clock module, a drive module, a comparator and a voltage division module, wherein the circuit is a closed-loop control scheme; an output voltage is compared with a given reference by detecting the output voltage; and on or off of a switch tube in the DC-DC chopper circuit is controlled by the RS trigger, so that control on the voltage peak is achieved. The voltage peak control circuit disclosed by the invention is simple and clear in structure and convenient to control; compared with a PID control, a complicated parameter calculation process is not needed; the dynamic characteristics of the voltage are good; the response speed is high; the regulating time is short; and in addition, the voltage peak control circuit also has an overvoltage protection function.

The invention discloses an output amplification stage temperature-controlled intelligent exhaust system, which is characterized in that it includes a power supply module, a temperature sensor U1, a fan M, a field effect tube Q4, a field effect tube Q5, and a front-end processing unit connected to the temperature sensor U1 Circuit, the capacitor C8 connected in series between the gate and drain of the field effect transistor Q4, the resistor R10 connected in parallel with the capacitor C8, the positive electrode is connected to the source of the field effect transistor Q4, and the negative electrode is connected to the GND pin of the temperature sensor U1 Connected polarity capacitor C7 and so on. The invention can automatically adjust the wind speed of the fan according to the temperature in the workshop, so as to intelligently cool down the temperature in the workshop, has a simple structure, high intelligence, and is suitable for wide use. The invention has the function of overvoltage protection to avoid damage to the system caused by high voltage.

The invention discloses a numerical-control direct-current current source. Voltage is provided by a D/A (digital to analog) conversion module, and is directly outputted by a power operational amplifying module, the outputted current is sampled for feedback control, the outputted current can range from several milliamperes to several amperes, the accuracy can reach 1 per mill, and the bidirectional current output can be realized. In addition, the numerical-control direct-current current source also has an overvoltage protection function and an outputted current and voltage measuring and displaying function.

The invention discloses a signal amplification type automatic irrigation control system based on a protective circuit. The signal amplification type automatic irrigation control system is characterized in that the system is mainly composed of a control chip U3, a diode D2, a detection probe Q1, a detection probe Q2, a resistor R2,the protective circuit, a resistor R1 and the like, wherein the resistor R2 is connected between the detection probe Q1 and a P pole of the diode D2 in series, the protective circuit is connected with a VIN pin of the control chip U3, and the resistor R1 is connected between the detection probe Q1 and the protective circuit in series. By the adoption of the signal amplification type automatic irrigation control system, a current signal output to the control chip can be amplified and thus can be well recognized by the control chip, and a precise control signal is output, so that the accuracy of control over a water pump can be improved greatly.

The invention discloses an intelligent LED lamp. The intelligent LED lamp comprises a lamp chamber and a waterproof cavity, wherein the waterproof cavity is formed behind the lamp chamber, a PCB (printed circuit board) is arranged on the inner side of the lamp chamber, and a plurality of LED beads are mounted on the PCB; a cooling cup wraps the lamp chamber, a platform at the rear end of the cooling cup is in contacted connection with the PCB, and a plurality of cooling fins are arranged in the circumferential direction of the cooling cup; a lens module is arranged in the lamp chamber. Scattered light beams of the plurality of LED beads can form parallel light by means of the lens module, the remote directional irradiation effect is realized, the application range of the LED projection lamp is expanded, a traditional high-power projection lamp is replaced, and energy consumption is reduced; a desiccant bag is arranged in the waterproof cavity and used for absorbing vapor in the waterproof cavity, a drive power supply is enabled to work in a dry environment, and the service life of the LED projection lamp is prolonged; meanwhile, a circuit has an overvoltage protection function, so that the intelligent LED lamp can be applied to regions with poorer power grid environment.

The invention discloses a temperature-compensated combustible gas detection and alarm system based on alarm protection, which is characterized in that it is mainly composed of a control chip U3, a triode VT1, a gas sensor Q, and a P pole connected to the 2Y pin of the control chip U3, The N pole is composed of a diode D7 connected to the base of the triode VT1, etc. The present invention sends out an alarm sound when the concentration of combustible gas is too high, its sensitivity is high, and it can effectively play a warning role; meanwhile, the present invention can adjust the alarm threshold value according to different environments, so as to meet the needs of use in different environments.

The invention discloses a fastening type sand box cover. The fastening type sand box cover comprises a cover body, the middle of the top of the cover body is provided with an overpressure protection device, which is fixedly connected with the cover body through an overpressure protection seat, inside the overpressure protection seat forms an exhaust channel, one end of the exhaust channel is communicated with the atmosphere, the other end of the exhaust channel is connected with a predischarging port, inside the exhaust channel is provided with an adjusting piece which is movably connected with one end of a pressure maintaining base through a spring, the other end of the pressure maintaining base is fixedly connected with a first sealing ring through a snap spring, and the first sealing ring can be in contact with the inner surface of a pressure maintaining mounting base to block the exhaust channel and the predischarging port or separated from the inner surface of the pressure maintaining mounting base to communicate the exhaust channel and the predischarging port. The fastening type sand box cover solves the problems that an existing sand box is large in operation space and failsto relieve pressure due abnormally excessive large internal pressure and the cover of the existing box is easy to slip off.

The invention discloses a double-isolation power amplifier circuit which comprises an optocoupler isolation circuit, a logic control circuit, an H-bridge drive circuit, an H-bridge circuit, a power circuit and an overvoltage and overcurrent protection circuit. The optocoupler isolation circuit is connected with the input end of the H-bridge drive circuit through the logic control circuit. The output end of the H-bridge drive circuit is connected with the H-bridge circuit; the power supply circuit is connected with the H-bridge drive circuit and the H-bridge circuit. And the output end of the H-bridge circuit is connected with the overvoltage and overcurrent protection circuit. The motor positive end and the motor negative end of the H-bridge circuit adopt two freewheeling modes of diode upward freewheeling and diode downward freewheeling at the same time, so that the motor voltage can be prevented from exceeding the power supply voltage; in the H-bridge circuit, a capacitor and a resistor are connected in series for follow current voltage stabilization, the influence of power supply fluctuation and an external magnetic field on motor operation indexes can be prevented, and the circuit reliability and the circuit stability are improved.