35results about How to "Effective shutdown" patented technology

The invention relates to a preparation method for an alcohol-substituted two-dimensional layered germane. Under the shielding of nitrogen or inert gas, CaGe<2> is dispersed into acetonitrile, ultrapure water and iodoethanol or iodopropanol are added for reaction under a dark condition, and stirring is carried out under room temperature for 5 to 10 days; the product is washed respectively by usingdeionized water and isopropanol and dried under room temperature and vacuum for 8 to 24 hours, and thereby the ethyl alcohol- or propyl alcohol-substituted two-dimensional layered germane is obtained.According to the alcohol-substituted two-dimensional layered germane prepared by the invention, the two-dimensional layered germane is a direct-band gap semiconductor, and the optical band gap rangeis between 1.8 eV and 1.9 eV. Compared with pure germane (band gap value: 1.56 eV), the alcohol-substituted two-dimensional layered germane is greatly improved, and is expected to effectively turn offa device in terms of application in field effect transistors.

A method for controlling stalling of a milling drum during reversing of a milling machine includes sensing the oil pressure on a working oil way connected with a working port (D) for reversing oil-taking of a walking hydraulic motor (5) of the milling machine; and when the oil pressure is equal to or larger than a preset oil pressure value, controlling a reversing valve corresponding to at least one of a hydraulic clutch (2) and a milling drum driving belt tensioning cylinder (1) of the milling machine to reverse so as to enable at least one of the hydraulic clutch and the milling drum driving belt tensioning cylinder to relieve pressure. In addition, the invention further provides a device for achieving the method and the milling machine comprising the device. According to the method and the device, reversing signals can be obtained without a mechanical input mode, reliability and safety are greatly improved through the oil pressure sensing mode, the operation is reliable, performances are stable, and the device is not easy to damage and long in service life.

The invention discloses a voltage type collision detection circuit, comprising: a collision signal generator, a collision signal processing circuit and a microprocessor connected in sequence; the collision signal processing circuit comprises a switch circuit, a voltage divider circuit and a comparison circuit connected in sequence; The switch circuit includes: a first resistor and a transistor, one end of the first resistor is coupled to the collision signal generator, and the other end of the first resistor is coupled to the gate of the transistor; the voltage divider circuit includes: a second resistor and a third resistor, One end of the second resistor is coupled to the positive electrode of the first power supply, and the other end of the second resistor is coupled to one end of the third resistor and the drain of the transistor, respectively; the comparison circuit includes: a comparator, the non-inverting end of the comparator is connected to the first The other ends of the two resistors are coupled, the output end of the comparator is coupled to the microprocessor, and the positive electrode of the comparator is coupled to the positive electrode of the second power supply. The present invention can ensure that the transistor is effectively turned off, and avoid potential system power consumption or device damage.

The invention relates to an ultrahigh pressure pulse silicon rectifier stack, belonging to the technical field of high-frequency rectification. The ultrahigh pressure pulse silicon rectifier stack comprises a plurality of diode layers connected in series, and each diode layer comprises a plurality of diodes which are connected in parallel between an upper metal plate and a lower metal plate, and a voltage-sharing capacitor is also connected in parallel between every two diode layers. The ultrahigh pressure pulse silicon rectifier stack can realize the effectively cutoff of bursting pulses of 300kV or lower than 300kV within 100ns, thereby obstructing inverse voltage; and in addition, the ultrahigh pressure pulse silicon rectifier stack can work at the frequency of 10MHz and lower than 10MHz, thereby solving the problem of high-voltage and high-frequency rectification.

The invention relates to an electronic technology, and particularly relates to an SCR (Semiconductor Control Rectifier) shut-off device with latching resistant capability. When an ESD (Electronic Static Discharge) pulse is additionally added, an RC (Remote Control) trigger circuit provides a high potential for grid voltage to start an NMOS (N-channel Metal Oxide Semiconductor), so that an SCR is effectively started, and the purpose of current leakage is achieved; after the current of the ESD pulse leaks, the RC trigger circuit provides a low potential for the grid voltage to start a PMOS (P-channel Metal Oxide Semiconductor), the gain of a parasitic NPN transistor is reduced, the condition of latching effect can not be met, and the SCR is effectively shut off, so that the latching effect is prevented from being generated under an electrifying condition. The SCR shut-off device disclosed by the invention is especially suitable for SCR devices used for ESD protection.

The invention relates to an air conditioner water pump control device and method. The control device comprises a main controller, an ultrasonic level gauge, a water pump and a water pump operation detection circuit. The ultrasonic level gauge internally comprises a relay, the output end of the water pump operation detection circuit is connected with the main controller, a first signal is output when the water pump is started up, and a second signal is output when the water pump is shut down; the live line input end of the water pump and the live line input end of the water pump operation detection circuit are both connected with a power live line through a normally-open contact of the relay, the zero line input end of the water pump and the zero line input end of the water pump operation detection circuit are both connected with a power zero line, and when the ultrasonic level gauge detects that the water level in a water collection disc exceeds a set threshold value, the relay is powered on; the main controller controls an air conditioner to be shut down according to the first signal when the water pump operates abnormally. The air conditioner water pump control device and methodare used for solving the problems that an existing air conditioner is short in service life and has poor reliability of controlling the water pump.

The invention discloses a manufacturing method of a high voltage silicon rectifier stack with low power consumption and quick switching and plastic packaging and the high voltage silicon rectifier stack. The manufacturing method disclosed by the invention comprises the steps of diode crystalline grain preparation, switch tube preparation, filling, welding, washing and packaging. By using differentcoefficients of thermal expansion and shape changes of crystalline grains and soldering lugs at high temperature, automatic pulling for the crystalline grains after welding can be realized without the need of aligning the crystalline grains in advance before welding, the air hole area is greatly reduced, the welding quality is improved, and the electrical yield of the crystalline grains after acid pickling of a mixed acid prepared from hydrofluoric acid, acetic acid, sulfuric acid and nitric acid in a volume ratio of 8.8: 13: 5.6: 9.2 is high. Measured data indicates that the forward voltageof the silicon rectifier stack cannot exceed 8 V when the backward voltage is 10000 V under the condition that other parameters are not influenced, and effective turning-off can be realized within extremely time of 17 ns, so that the high frequency rectification problem at high voltage and low power consumption is solved.

The invention provides a stepping power ultrasonic strong pulse anti-scaling and descaling device and a control method. The device adopts a control method in which one trigger main circuit corresponds to a group of transducer coils, so that the effect of ultrasonic pulse vibration is stronger. At the same time, two thyristor main circuits with different connection methods are triggered alternately, so that the two groups of coils of the transducer work alternately. , and adopts a step-by-step control method, which is used in anti-scaling and descaling equipment to obtain intermittent ultrasonic waves, so that the dynamic film formed by ultrasonic waves on equipment tubes and board walls will not be damaged due to the pause of ultrasonic waves, which is great for anti-scaling and descaling equipment It is beneficial, especially for equipment with fast fouling speed, the effect is obvious.

The invention provides a phase-locked loop frequency synthesizer comprising a phase detection discriminator and a charge pump, wherein the charge pump comprises an upper power supply and a lower powersupply; the phase-locked loop frequency synthesizer also comprises a first extended circuit and a second extended circuit; the first extended circuit provides a trigger signal for the second extendedcircuit according to the output of the phase detection discriminator; and the second extended circuit provides current together with the upper power supply and the lower power supply under the control of the trigger signal. The phase-locked loop frequency synthesizer broadens the lineal working area by extending the phase detection discriminator / the charge pump, achieves dynamic switch of the charge pump current in a locking process, and accelerates locking process.

The invention belongs to the technical field of hydraulics, and in particular relates to an adaptive buffering hydraulic speed-limiting cut-off device, system and method, aiming at solving the severe load shock and impact on the hydraulic system caused by the action of the existing machine-hydraulic speed-limiting cut-off valve. question. The hydraulic speed limiting cut-off device includes an accumulator and an adaptive cut-off valve. The adaptive cut-off valve includes a hydraulic valve body. The hydraulic valve body is provided with a main oil circuit chamber and a buffer oil circuit chamber arranged side by side. There is a cut-off valve core and an orifice A. The cut-off valve core is provided with a setting screw A, a return spring A, and two openings that communicate with its inner cavity and respectively lead to the main oil circuit chamber and the buffer oil circuit chamber. A self-adaptive valve core and an orifice B are arranged in the buffer oil circuit chamber, a setting screw B and a return spring B are arranged on the self-adaptive valve core, and the accumulator is connected with the buffer oil circuit chamber. The hydraulic speed limit cut-off device can make the load softly brake when the load falls over speed.

Embodiments of the present invention discloses a method of protection of an electronic device, the electronic device comprising a control switch controlling the output of the power supply, the method comprising: detecting whether an abnormal event occurs, if an abnormal event is detected, the control signal is generated to control the control switch, based on the control signal, the control switch disconnects the output path of the power supply. Accordingly, embodiments of the present invention also disclose an electronic device. Embodiment of the present invention may enable the electronic device to achieve an effective shutdown after an abnormality, eliminate the electronic device due to an abnormal event after the shutdown, the abnormal chip of the electronic device continues to energize the safety hazard.