43results about How to "Protect the circuit" patented technology

A system comprising a measurement device and a handheld device is disclosed, the system adapted to withstand, detect, record, and display heat cycle event counts. The measurement device comprises a sensor for measuring and a heat cycle detection unit. The heat cycle detection unit comprises a temperature or pressure responsive element, a detection module, data interface, and data memory. The handheld device comprises a screen, a button, a communication circuit, and a processing system. The communication circuit is configured to communicate with the measurement device and a computing device and the processing system is configured to receive non-measurement information from the measurement device, display the received information on the screen, and cycle the received information displayed on the screen based on an actuation of the button, wherein the handheld device is used to display a heat sterilization cycle count of the measurement device.

The invention provides a control method of an electronic cigarette. The electronic cigarette comprises an atomization device and a battery device, wherein the atomization device comprises a liquid guide element and a heating element; the battery device comprises a wetting detection module, a control module, a storage module, a switch module and a power source module. The control method comprises the following steps: the wetting detection module detects a relevant physical quantity X and feeds back the relevant physical quantity X to the control module; the control module calculates according to corresponding relation data of relevant physical quantity X and wetting degree Q prestored in the storage module, so as to obtain the wetting degree Q; the control module judges the size relation of the wetting degree Q and a first threshold Q1; if Q is greater than or equal to Q1, the electronic cigarette operates continuously, and if Q is less than Q1, the control module sends a standby command to the switch module; the switch module disconnects the electronic connection between the power source module and the heating element. The invention further provides the electronic cigarette for applying the control method.

A device for real-time shutdown protection of high-voltage fast pulse signals, the pulse signal generator (1) generates a control signal for high-voltage fast pulse generation, controls the pulse power supply (2) to generate high-voltage fast pulses, and acts on the experimental chamber (3) , the discharge current of the experimental cavity (3) is introduced into the current measurement sensor (4), and the voltage signal on the current measurement sensor (4) is connected to a measurement channel of the digital oscilloscope (5), as the trigger source of the oscilloscope, a suitable trigger level. Once the medium breaks down, the discharge current is too large, and the voltage signal on the current measurement sensor (4) is enough to trigger the oscilloscope (5), then the trigger feedback port of the oscilloscope (5) will immediately output a TTL logic signal, which passes through the signal The conversion circuit (6) performs processing, outputs a signal conforming to the shutdown signal interface standard of the pulse signal generator, and turns it off, thereby playing a protective role. The time delay of the present invention can be controlled within 10 μs.

The invention discloses a novel mobile wall-mounted frequency converter case comprising a frequency converter case body. Convenient lubrication limiting sliding devices are fixedly connected to four corners of the outer wall of one side, away from a case door, of the frequency converter case body; and the frequency converter case body is connected with a wall-mounted track by the convenient lubrication limiting sliding devices. A brake support plate is fixedly connected to the outer wall of the bottom of the wall-mounted track; and the outer wall of one side, away from the frequency convertercase body, of the wall-mounted track is fixedly connected with the wall surface. The invention relates to the technical field of related frequency converter equipment. The novel mobile wall-mounted frequency converter case is suitable for indoor factory rooms with high dust and indoor humidity. The frequency converter case can be mounted on the wall and can move up and down automatically, so thatthe frequency converter case can be stored at a high altitude, so that the space utilization rate is increased; and the dust accumulation amount and the moisture degree inside the frequency convertercase can be reduced.

The invention discloses an electric spring energy assimilation system. The invention improves the current electric spring structure to adapt to the grid structure of the same end with source and load.An alternating current side of a first single-phase inverter is connected in series with a wide voltage load. A direct current side of the first single-phase inverter is connected with a direct current bus through a bidirectional isolated power electronic transformer. New energy power generation equipment is assembled on the direct current bus, so that an isolated back-to-back structure of the same end with source and load is formed. Under a condition that the power generation power of a distributed new energy power supply is not affected, the alternating current bus voltage is regulated by the wide voltage load, the safe and reliable operation is achieved. An isolated power electronic transformer is arranged between the first single-phase inverter and the grid-connected converter to be isolated. The circuit can be protected, the control program is simplified, and the control of the direct current voltage of the first single-phase inverter is realized. Technical problem that in a weaknetwork environment at the same end with source and load, new energy assimilation is insufficient , which is very prone to occur a high voltage table problem and is hardly solved economically and effectively can be solved.

The invention belongs to the field of household appliances, and especially relates to an anti-loosening safety socket. The anti-loosening safety socket comprises a socket body, and at least one pair of slots is arranged in the seat body. An elastic reed is arranged in each slot; an inductance coil is fixedly connected in the slot; one end of the inductance coil is electrically connected with a conductive plate; the conductive plate and the inductance coil are electrically connected in series to the circuit of the elastic reed; the inductance coil and the elastic reed are arranged at the upperend and the lower end of the conductive plate respectively, a chute is formed in the side wall of the socket body, the inner bottom face of the chute is communicated with the multiple slots, a protection block is connected into the chute in a sliding mode, and a containing groove is formed in the inner bottom face of the chute. The inductance coil is connected to the circuit of the elastic reed inseries, when the pin is connected with the elastic reed, the inductance coil can generate an inductance phenomenon, so that the current on the circuit is gradually increased, the impact on an electric appliance caused by sudden increase of the current in the circuit can be effectively avoided, and the electric appliance is protected.

An electronic device includes a monitoring unit that monitors a voltage of a first terminal that receives power supplied from a power supply apparatus, and a control unit that performs control so as to stop the power supply from the power supply apparatus if a voltage variation per unit time of the first terminal is not less than a first predetermined value or the voltage of the first terminal is not less than a second predetermined value.

An electrostatic discharge (ESD) power clamp circuit including a RC-delay element coupled to a plurality of serialized inverter elements with a power clamp element and an ESD-triggered keeper device coupled to the plurality of inverters. During negative mode ESD events, the ESD-triggered keeper device is activated and assists the power clamp element to pull up and strongly conduct current to protect the circuit. Additionally, a method of ESD protection in a circuit is provided. The method includes coupling a RC-delay element to an input of a plurality of serialized inverter elements, coupling an output of the plurality of serialized inverters with an ESD-triggered keeper device and a power clamp element, triggering the ESD-triggered keeper device to turn on during negative ESD events and conducting current by the power clamp element with assistance of the ESD-triggered keeper device to protect the circuit as a result of negative ESD events.

The invention discloses a centrifuge frequency-converting control circuit and a control method thereof. The centrifuge frequency-converting control circuit comprises a variable frequency power supply circuit and a power frequency power supply circuit. The variable frequency power supply circuit comprises a frequency converter and the power input end of the frequency converter is connected with a power frequency three-phase power supply via the normally-opened switch of a contactor KM6. The power output end of the frequency converter is used for powering up a centrifuge via the normally-opened switch of a contactor KM5. The frequency converter is also connected with the normally-opened switch of a relay KA1. The power frequency power supply circuit comprises a normally-opened switch of a contactor KM7 and an FR fuse. The coil power supply circuit of the contactor KM6 and the contactor KM5 is connected in series with the normally-opened switch of a relay KA5 and the normally-closed switch of the contactor KM7. The coil power supply circuit of the contactor KM7 is connected in series with the normally-opened switch of a relay KA6 and the normally-closed switch of the contactor KM5. The relay KA1, the relay KA5, the relay KA6 and the frequency converter are controlled by a PLC. The centrifuge frequency-converting control circuit is small in start-up current, and the impact to the power grid is avoided. Meanwhile, the service life of an electric motor is prolonged. Moreover, the circuit is simple in structure, reliable in operation and strong in overload capability.

The invention discloses a direct current anti-reverse polarity circuit using an MOS (metal oxide semiconductor) tube. The direct current anti-reverse polarity circuit comprises a diode D1, a resistor R1, a voltage-regulator tube D2 and the MOS tube Q1, wherein the anode of the diode D1 is connected with an external power supply of a system, and the cathode of the diode D1 is connected with one end of the resistor R; the other end of the resistor R1 is connected with the cathode of the voltage-regulator tube D2 and the grid of the MOS tube Q1; the anode of the voltage-regulator tube D2 and the drain of the MOS tube Q1 are grounded; the source of the MOS tube Q1 is connected with the grounded end of the system. According to the direct current anti-reverse polarity circuit disclosed by the invention, by utilizing the turnon and turnoff characteristics of the MOS tube, a current loop is cut off after reverse polarity of input voltage, and the circuit protection goal is achieved.

The invention provides a method for realizing charging, a charger, a server and a system. The method comprises the following steps: a first communication connection is established between the chargerand the server; a second communication connection is established between the terminal and the server. Obtaining the state of the charger through the first communication connection and obtaining the battery charge information from the terminal through the second communication connection; A charging command or a power off command is sent to the charger according to the state of the charger and the battery charge message, and the charger performs charging or power off operation according to the charging command or power off command. The server judges whether the current terminal needs to be charged or powered off according to the battery power message of the received terminal and the state of the charger corresponding to the current terminal, thereby sending a charging or powering-off instruction to the charger, saving energy and protecting the terminal circuit.

The invention provides a wheel speed sensor interface control circuit for an active electronic brake system. The wheel speed sensor interface control circuit for the active electronic brake system comprises a power supply switch unit, a high side power supply unit, a control unit, a signal processing unit, a resistor and a low side power supply unit, wherein the power supply switch unit is accessed into a vehicle-mounted power supply; the high side power supply unit is electrically connected with an anode wiring terminal of a wheel speed sensor and the power supply switch unit; the control unit is electrically connected with the power supply switch unit and the high side power supply unit; the signal processing unit is connected between a cathode wiring terminal of the wheel speed sensor and the control unit; the resistor is connected between the cathode wiring terminal of the wheel speed sensor and the low side power supply unit; and the low side power supply unit is further electrically connected with the control unit. According to the wheel speed sensor interface control circuit for the active electronic brake system, the wheel speed sensor can be prevented from working under asevere working environment, the circuit where the wheel speed sensor is arranged is effectively protected, and therefore, the safety and reliability of systems such as ABS and ESC are guaranteed.

The invention provides a circuit capable of preventing reversal of current of operational amplifiers connected in series. The output end of the operational amplifier U1 is connected with the phase reversal end of the operational amplifier U2 through a resistor R3 and is used as one path of input of the operational amplifier U2. The resistor is connected between the two levels of operational amplifiers in series when the two levels of operational amplifiers are in cascade connection, so that the magnitude of reverse current is effectively limited, and the circuit is protected.

The invention discloses a BOOST direct-current boost short-circuit protection circuit. The BOOST direct-current boost short-circuit protection circuit comprises a BOOST module, a switch module connected with the BOOST module, a voltage detection module, a voltage amplitude limiting module, a current acquisition delay module and a state maintenance module, the voltage detection module is connectedwith the switch module and the voltage amplitude limiting module, the current acquisition delay module is connected with the voltage detection module and the state maintenance module. When the input voltage is equal to the output voltage, the switch module can be turned off, so that the output end has no voltage, and the risks of circuit protection, board explosion and combustion are avoided. Andwhen the load is short-circuited, the voltage amplitude limiting module can limit the amplitude of the peak voltage and then enter the BOOST module, so that the BOOST module is protected. And when theload is short-circuited, the BOOST module is closed, so that the BOOST module is protected. The state maintenance module can ensure that the BOOST module is at a low level continuously and is alwaysin a closed state when the output is in a continuous short circuit state.