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 provides a charging method and device integrating quick-charging rules and USB charging rules, and relates to the technical field of charging. The method includes the steps that when the charging device is connected with an external power supply and detects that a portable device is connected, the charging device identifies the category of the power supply and charges the portable device according to Qualcomm Quick Charge or USB Battery Charging rules, and when it is detected that circulating currents between the charging device and the portable device are small, namely the portable device has been charged, the external power supply charges a built-in battery of the charging device according to the Qualcomm Quick Charge or USB Battery Charging rules; when the charging device is connected with the external power supply and it is not detected that the portable device is connected, the external power supply is controlled to charge the built-in battery in the charging device according to the Qualcomm Quick Charge or USB Battery Charging rules; when the charging device is not connected with the external power supply and it is detected that the portable device is connected, the built-in battery in the charging device charges the portable device according to the USB Battery Charging rules.

The invention discloses a light-emitting diode (LED) lamp control circuit having a key element overvoltage protection function and characteristics of simplicity in structure, reliability in control and low cost. The LED lamp control circuit comprises an LED light source load (6), a rectifying circuit (4) which converts an alternating current into a direct current, and a constant current circuit (7) which stabilizes the voltage and the current of the LED light source load (6), wherein the LED light source load (6) comprises at least one group of a plurality of LEDs which are connected with one another in series; the constant current circuit (7) comprises at least one group of constant current source devices; each group of constant current source devices comprise at least one depletion mode field effect transistor; a drain of each depletion mode field effect transistor is a contact; a source and a grid of each depletion mode field effect transistor are short-circuited to form another contact; and each group of the constant current source devices are parallelly connected with a first zener diode with a special voltage of which a voltage stabilization operating point is 20 to 80-volt direct current. The LED lamp control circuit can be applied in the field of LED lighting circuits.

The invention relates to water glasses, in particular to safe hydrogen-rich water glass. The water glass comprises a water glass base, a water glass barrel and a water glass lid, wherein the water glass base comprises an electrolytic bath, a hydrogen dissolving device, solid activated carbon and a one-way dredging membrane; the electrolytic bath comprises a negative electrode, an ionic membrane, a positive electrode and an electrolytic bath controller; the negative electrode and the positive electrode which are contacted with drinking water are inlaid on the upper and lower sides of the ionic membrane, thus, an electrolytic bath core assembly is formed and mounted at the upper part of the water glass base through the one-way dredging membrane; the electrolytic bath core assembly is further connected with the electrolytic bath controller; the solid activated carbon is arranged below the electrolytic bath core assembly; the hydrogen dissolving device in connection control with a hydrogen dissolving device controller is arranged above the electrolytic bath core assembly; the water glass base and the water glass barrel are connected through a threaded structure; a filter element mounted on a filter element support is arranged in the water glass barrel. The safety of the quality of produced hydrogen-rich water bodies can be guaranteed and the safety in the risk aspect during usage can also be guaranteed.

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.

The invention relates to a direct-current voltage balancing plate for a modular active filter. The direct-current voltage balancing plate comprises a first voltage balancing resistor, a second voltage balancing resistor, a first signal conversion resistor, a second signal conversion resistor and a comparator, wherein the first voltage balancing resistor and the second voltage balancing resistor have the same resistance and are connected in series; the two ends and the serially-connecting points of the first voltage balancing resistor and the second voltage balancing resistor are respectively connected with the two ends and the midpoint of each serially-connected branch in the active filter; each serially-connected branch is formed by connecting even capacitors in series; the first signal conversion resistor and the second signal conversion resistor are respectively connected at the two ends of the first voltage balancing resistor and an output port of the direct-current voltage balancing plate; the positive end of the comparator is connected with the connecting end of the first voltage balancing resistor and the first signal conversion resistor, and the negative end of the comparator is connected with an external reference voltage; the output end of the comparator is connected with the output port of the direct-current voltage balancing plate; the output port of the direct-current voltage balancing plate is also connected with a control plate. Besides the function of balancing the voltages of the capacitors in the modular active filter, the direct-current voltage balancing plate for the modular active filter also has the functions of direct-current high-voltage signal conversion and over-voltage protection of direct-current voltage.

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 phase-controlled reactive power dynamic compensation device and a compensation method thereof. The device includes a control and detection circuit, a compensation capacitor, and a compensation transformer; the secondary winding of the compensation transformer is connected to the bus bar after being connected in series with the capacitor, and the two ends of the primary winding are respectively connected to different phase lines or neutral lines of the bus bar through several selection switches ;By controlling the on-off of the selector switch, the primary winding is selectively applied with the same phase voltage, out-of-phase phase voltage, or line voltage connected to the secondary winding; the combination of the multiple selector switches forms multiple compensation gears bit. This device comprehensively applies out-of-phase phase voltage, in-phase phase voltage and line voltage on the input coil of the primary winding of the compensation transformer, and adjusts the transformation ratio to compensate the secondary output. The structure is simple but it is easy to realize dynamic compensation. High efficiency and good compensation effect. The compensation device and method of the present invention are applicable to all voltage levels of the existing power grid and various occasions such as substations and electrified railways.

The invention discloses a primary battery type trace oxygen analyzer. An electrolytic cell is connected with a primary battery in series, and a detection gas circuit is in parallel connected with a bypass pressure regulator after entering into a channel; when the gas flows through a bypass gas circuit, a gas circuit is washed, stabilizing pressure needed by the detection gas circuit is produced, and the surplus gas in the bypass is discharged by a vent nozzle. The electrolytic cell is provided with a matched water storing and replenishing device, and a liquid level of an alkaline liquor in the electrolytic cell is controlled in a specified marked line. The primary battery and the electrolytic cell can regularly work for a long time. A gas outlet of the primary battery is connected with a micro-motion safety device in series, and the gas is exhausted from the gas outlet to prevent the alkali liquor from staining and damaging a detection gas circuit system due to unexpected backstreaming when the pressure at the gas outlet of the primary battery is excessive. With the adoption of the primary battery type trace oxygen analyzer, the trace oxygen in various industrial gas can be quickly detected, the industrial gas on line detection is carried out, multiple other trace oxygen analyzers are simultaneously detected when the primary battery type trace oxygen analyzer is used as an calibration instrument, and the oxygen standard gas in the range of 2-50PPMv is checked and compared; and the primary battery type trace oxygen analyzer has the effects of convenient and quick to use, and the comparison result is accurate and reliable.

The invention discloses a protective automatic irrigation control system based on a voltage compensation circuit, which is characterized in that: a control chip U3, a diode D2, a detection probe Q1, a detection probe Q2, and a P The resistor R2 between the electrodes is composed of. The present invention adopts the A6210 integrated chip as the control chip, and combines the logic gate to control the water pump. Compared with the traditional control system using mechanical switches to control, the present invention has a lower error rate and can control the work of the water pump more accurately. The invention can compensate the voltage drop caused by wires or resistance, so that the working voltage of the invention is more stable.

The invention provides a micropressure steam valve of an electric rice cooker. The micropressure steam valve comprises an upper valve shell, a lower valve shell and a counterweight, wherein the lower valve shell is fastened with the upper valve shell, and the counterweight is arranged in a space formed by the upper valve shell and the lower valve shell. The top of the upper valve shell is provided with an exhaust hole, the bottom of the lower valve shell extends upwardly to form a step-shaped upright, the lower end of the upright is hollowed to form air inlet ends, and the air inlet ends upwardly extend to penetrate a step of the upright to form air inlet holes. The counterweight sleeves the upper end of the upright. The invention further provides the electric rice cooker. The inside of the electric rice cooker is kept in a micropressure state through the micropressure steam valve according to structural design, steam generated by boiling liquid in the electric rice cooker is discharged in time, most steam is liquefied and flows back in the steam valve, and temperature of the discharged steam is reduced. The micropressure steam valve has an overpressure protection function and is capable of avoiding too high pressure of the steam in the electric rice cooker. The electric rice cooker with the micropressure steam valve is safe, energy saving and capable of meeting requirements of modern life.

The invention discloses an intelligent exhausting system capable of isolating back-stage interference. The intelligent exhausting system is characterized by comprising a power supply module, a temperature sensor U1, a fan M, a processing chip U2, a resistor R11 which is connected between a pin 2 and a pin 4 of the processing chip U2 in series, a resistor R10 which is connected between a VOUT pin of the temperature sensor U1 and a pin 1 of the processing chip U2 in series, and a capacitor C7 with one end connected with the VOUT pin of the temperature sensor U1 and the other end connected with aGND pin of the temperature sensor U1 and the like. According to the intelligent exhausting system disclosed by the invention, a wind speed of the fan can be automatically adjusted according the temperature in a workshop, so that the temperature in the workshop is intelligently reduced; the intelligent exhausting system is simple in structure and high in intelligent degree and is suitable for being widely used. The intelligent exhausting system has an over-voltage protection function, and damages caused by high voltage on the system are avoided.

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 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.

A special power source for home video cinema contains over voltage protector, remote control device, constant voltage device, noise-filter unit, self-locking electronic switch with the characteristic of soft connecting over voltage protector, remote control device, constant voltage device, noise-filfer unit self-locking electric switching in sequence to unify them as one part.

The invention is a correlation type optoelectronic switch which adopts two pairs of infrared light tubes changing-over and used for an occasion of a border detection or an end-of travel position detection, for example, an elevator running leveling locating detection and the like. With the help of being provided with two pairs of the infrared light tubes with a changing-over function, the service life of a transmitting tube is greatly improved and is characterized in that the antijamming capability is strong, the circuit is simple and the power dissipation is low. The changing-over type correlation trough type optoelectronic switch adopts various voltage regulator circuits and protective circuits so that the range of the voltage regulators is broad. Signal is output by a square-wave generator to drive an infrared emission module and the received signals are dynamically alternating-current couped to be given to a control output circuit so as to have a strong antijamming capability. The changing-over type correlation trough type optoelectronic switch is provided with two pairs of the infrared light tubes of A and B, when the infrared light is shielded, one pair of the infrared light tube which are worked originally (for example the pair of the infrared light tube A) stops working so that the other pair of the infrared light tube (for example the pair of the infrared light tube B) is switched to work. When the infrared light is not be shielded, the state remains as before. When the infrared light is shielded again, the working pair of the infrared light tube (for example the pair of infrared light tube B) is stopped working, and the pair of the infrared light tube A is switched to work.

The present invention provides a 200W LED drive power circuit, which includes a strip-shaped PCB substrate packaged with the LED drive power circuit. The LED drive power circuit includes an EMI filter rectifier circuit, a Boost circuit, a Buck circuit, and a load circuit. The EMI filter and rectifier circuit is connected to the AC power supply. The Boost circuit is used to receive the signal rectified by the EMI filter and rectifier circuit and output a DC high voltage signal. The Buck step-down circuit is used to reduce the DC high voltage signal to a constant voltage and output it to A load circuit; wherein, a chip power supply circuit is also provided between the Boost voltage boosting circuit and the Buck voltage reduction circuit for providing power to the voltage reduction chip of the Buck voltage reduction circuit. The power supply circuit of the present invention is simple in design, can realize stable constant current output, has overvoltage protection function, and the output current can be adjusted according to the current required by the actual LED; The lighting range can be expanded.

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 an alternating current noise-eliminating negative ion generator. The alternating current noise-eliminating negative ion generator is characterized by mainly comprising a transformer T2, a control chip U3, a triode VT1, a discharging terminal E, a potentiometer R3 and the like, wherein the potentiometer R3 is connected between the b end and the f2 end of a gas sensitive sensor. The alternating current noise-eliminating negative ion generator can generate negative ions automatically according to the concentration of harmful gas in a room, is very high in sensitivity and can effectively purify air in the room; meanwhile, the sensitivity can be adjusted according to needs, so that the generator can be applicable to different occasions; and in addition, the negative iongenerator has an overvoltage protection function and can cut off a power supply automatically in case of an overvoltage, thereby protecting electronic components from damage by the voltage.

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.

The invention provides a micropressure steam valve of an electric rice cooker. The micropressure steam valve comprises an upper valve shell, a lower valve shell and a counterweight, wherein the lower valve shell is fastened with the upper valve shell, and the counterweight is arranged in a space formed by the upper valve shell and the lower valve shell. The top of the upper valve shell is provided with an exhaust hole, the bottom of the lower valve shell extends upwardly to form a step-shaped upright, the lower end of the upright is hollowed to form air inlet ends, and the air inlet ends upwardly extend to penetrate a step of the upright to form air inlet holes. The counterweight sleeves the upper end of the upright. The invention further provides the electric rice cooker. The inside of the electric rice cooker is kept in a micropressure state through the micropressure steam valve according to structural design, steam generated by boiling liquid in the electric rice cooker is discharged in time, most steam is liquefied and flows back in the steam valve, and temperature of the discharged steam is reduced. The micropressure steam valve has an overpressure protection function and is capable of avoiding too high pressure of the steam in the electric rice cooker. The electric rice cooker with the micropressure steam valve is safe, energy saving and capable of meeting requirements of modern life.