35results about How to "Effective shutdown" patented technology

The invention relates to a half bridge inverter for dragging a plurality of motors with asynchronism and realizing the rotor frequency control system, comprising a motor group, a rectifier group, a current limiter group, a chopper group, an isolator group, a current limiting smoothing device, a power capacitor, a half bridge inverter, a speed feedback apparatus, a current feedback apparatus, an excitation transformer, an excitation contactor, a control contactor, a switching contactor, a driver, a microprocessor, a A/D convertor and a signal processer, which adopts an invert control theory, the CPU technology and a three phasezero line circuit, works orderly through the PWM signal control chopper output by the driver, further dragging a plurality of motors for real-time online control, realizes the operation of the crane, the fan or the water pump, characterized by simple circuit, small volume, good performance price ratio, high reliability, energy saving and safe operation and the like.

The invention relates to an intelligent speed-limiting cut-off valve. The intelligent speed-limiting cut-off valve mainly comprises a hydraulic valve core, a valve body, a return spring, a proportional electromagnet, a valve front pressure sensor, a valve rear pressure sensor, a speed-limiting cut-off controller and other parts. The valve uses the valve front pressure, valve rear pressure and a proportional electromagnet control signal to calculate and measure the flow rate of a valve port. When the flow rate exceeds a set value, the speed-limiting cut-off controller quickly and stably closesthe valve port and cuts off an oil path through two control modes of pressure control and flow control successively. The intelligent speed-limiting cut-off valve can be applied to occasions such as engineering machinery, hydraulic elevators and hydraulic lifting platforms and can prevent accidents such as overspeed falling caused by pipeline rupture of vertical loads.

The invention provides a direct current circuit breaker of a mixed switching device. The direct current circuit breaker consists of a first mechanical switch (K1), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a first full-controlled switch device (S1), a second full-controlled switch device (S2), a third full-controlled switch device (S3), a fourth full-controlled switch device (S4), a fifth full-controlled switch device (S5), a sixth full-controlled switch device (S6), a seventh full-controlled switch device (S7), an eighth full-controlled switch device (S8), a first half-controlled switch device (T1), a second half-controlled switch device (T2) and a first light arrester (Z1). By controlling turning on and turning off of the full-controlled switch devices and the half-controlled switch devices, rapid turning on and turning off of fault current of a direct current power grid are achieved.

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.

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 belongs to the technical field of power supplies and discloses a high-voltage high-power supply discharging device comprising an auxiliary power supply, a control switch, a switch circuit and a bleeder resistor, wherein one end of the control switch is connected to the auxiliary power supply; the other end of the control switch is connected to the switch circuit; the on/off state ofthe switch circuit is controlled by the voltage change of the auxiliary power supply; one end of the bleeder resistor is connected to the positive terminal of a bus; the other end of the bleeder resistor is connected to the negative pole of the bus through the switch circuit; the bleeder resistor is connected in parallel with the bus when the switch circuit is switched on; high voltage on the busof the power supply is released by the bleeder resistor; and the bleeder resistor is disconnected from the bus when the switch circuit is switched off. The high-voltage high-power supply discharging device can quickly and safely discharge the high voltage on the bus when a high-voltage high-power supply is powered off, and automatically cuts off a discharge circuit when the high-voltage high-powersupply recovers power supply, without affecting the normal operation of the high-voltage high-power supply.

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 discloses a voltage type collision detection circuit. The circuit comprises a collision signal generator, a collision signal processing circuit and a microprocessor which are connected in sequence. The collision signal processing circuit comprises a switching circuit, a voltage division circuit and a comparison circuit which are connected in sequence, the switching circuit comprisesa first resistor and a transistor, one end of the first resistor is coupled with the collision signal generator, the other end of the first resistor is coupled with a grid electrode of the transistor,the voltage division circuit comprises a second resistor and a third resistor, one end of the second resistor is coupled with a positive electrode of a first power source, and the other end of the second resistor is coupled with one end of the third resistor and a drain electrode of the transistor. The comparison circuit comprises a comparator. The normal phase end of the comparator is coupled with the other end of the second resistor, the output end of the comparator is coupled with the microprocessor, and a positive electrode of the comparator is coupled with a positive electrode of a second power source. By means of the voltage type collision detection circuit, effective turn-off of the transistor can be ensured, and potential system power losses or device damage can be avoided.

The invention discloses a drive and control circuit of a large-power gate-turn-off thyristor (GTO), and belongs to the technical field of the drive and control of the large-power controllable thyristor. The drive and control circuit is divided into two parts: a logic control circuit and an energy output circuit; the two parts realize the reliable electric isolation from the providing of the powerenergy and the output of a control signal; and meanwhile, the logic control of the drive and control circuit is realized through an analog circuit, the code programming demand is unnecessary, and theelectromagnetic interference resistance of the drive and control circuit is greatly increased; and meanwhile; the logic control circuit can realize the smooth switch and seamless connection of variousenergy units of the energy output circuit at different switch-on/off stages through the precise cooperation of various control units; and finally, the drive and control circuit can safely and reliably drive and control the GTO, and realize the DC current with the highest switch-on and switch-off amplitude of 3500A.

The invention discloses an arc extinction device and method for a transmission and distribution line and relates to the technical field of protection of a power system. According to the technical scheme, an arc extinction mechanism is arranged at one side of a fixed insulator string, the arc extinction mechanism comprises an arc extinguisher, starting rods, an upper yoke plate and a lower yoke plate, the upper part of the insulator string is connected with the arc extinguisher, the arc extinguisher is connected with one end of the upper starting rod, and the lower part of the insulator stringis connected with one end of the lower starting rod. The arc extinction device has the beneficial effects that compared with an existing lightning protection gap, the device has the advantages of being capable of quenching power-flow current and guaranteeing that a line does not trip. Compared with a zinc-oxide arrester, the arc extinction device has the advantages of being switched off rapidly, having long service life, and being capable of cutting large industrial frequency current. Compared with an existing air-jet arc extinction lightning protection gap technology, the device has the advantages of being capable of cutting power-flow current timely and reliably, being reusable and having long service life.

The invention discloses an electronic atomization device and a control circuit for increasing the driving frequency of the electronic atomization device. The control circuit comprises a reverse control unit, a push-pull output unit and a power output unit, wherein the reverse control unit outputs control signals according to received PWM pulse signals, the push-pull output unit is controlled to realize the push-pull circuit to be conducted, driving waves are outputted, and power conversion of the whole circuit in the electronic atomization device is controlled. According to the control circuitdisclosed in the invention, the PWM pulses effectively cut off the power supply through high-level conduction low-level cutoff characteristics of a reverse switching transistor Q10A in the reverse control unit; and correspondingly, the push-pull output unit adopts an N-type switching transistor and a P-type switching transistor to form a symmetrical push-pull driving circuit, in alternate switching between the high level and the low level of the PWM pulses, the circuit conducted and turn-off delay cycle of the push-pull output unit is adjusted to 1 to 10 microseconds, the frequency cycle is greatly shortened, and the driving frequency is further enhanced.

The invention discloses a low-torque valve switching device and application. The low-torque valve switching device comprises a valve body, a valve cover, a valve core and a first stopping sheet, wherein the valve body and the valve cover form a valve cavity, openings are formed in the top, the left side and the right side of the valve cavity respectively, the valve core is located in the valve cavity, the valve core can rotate, and a horizontal through hole is formed in the valve core. A first groove is formed in the perpendicular direction of the horizontal through hole, and the arc-shaped first stopping sheet is located in the first groove. A second groove is formed in the perpendicular direction of the horizontal through hole of the valve core, the position of the second groove is opposite to that of the first groove, and a second stopping block is located in the second groove. The valve core further comprises a rotation shaft at the top, and the rotation shaft is located at an opening in the top of the valve cavity. The valve core is connected with a motor. The low-torque valve switching device can be used in low-power dissipation control valves, household calorimeters with valves and cold scales. The low-torque valve switching device is small in torque and easy to drive, effective switching-off of a valve is achieved by the arrangement of the stopping sheet, and the low-torque valve switching device is simple in structure, low in cost, strong in reliability, and applicable to long-distance control, electric control and large-scale application.

The invention discloses an efficient coupling output method of high-peak power laser for cleaning. In order to achieve the object, the laser adopts an MOPA structure (i.e., the laser generated by an oscillator is amplified by an amplifier and then output), and an oscillator resonant cavity of the laser adopts a dynamic asymmetric stable cavity, so that a better laser output mode can be guaranteed,higher power can be achieved, the offset sensitivity of a lens is low, the effective area of a crystal rod in the amplifier is filled with light spots, the extraction efficiency of the amplifier is improved, and the LD damage caused by overlarge laser light spots can be avoided.

The invention discloses a transformer isolation amplifier having chopped wave pulse signal clamping. The transformer isolation amplifier includes a power transformer and a signal isolation transformer, the power transformer provides a chopped wave pulse signal to control a chopper tube of the signal isolation transformer, a clamping circuit is arranged between the input end of the chopped wave pulse signal and the power transformer, and the clamping circuit enables high voltage of the input signal of the chopper tube to be larger than break-over voltage of the chopper tube and enables low voltage of the input signal of the chopper tube to be smaller than pinch-off voltage of the chopper tube. The transformer isolation amplifier utilizes clamping circuit to clamp the top or bottom of the chopped wave pulse signal of the signal isolation transformer, thereby enabling reliable turning-off and turning-on of the chopper tube of the signal isolation transformer, and improving accuracy of measurement.

The invention provides a protection circuit for a single-cell series lithium battery, including a battery pack; a detection module with a detection unit for sampling and comparing the voltages of corresponding batteries, and generating a discharge control signal when the sampling voltage is less than a preset minimum voltage; otherwise Generate a charge control signal; a discharge control module connected to the positive pole of the battery and the detection unit is used to generate a discharge shutdown signal according to the discharge control signal; a discharge switch module connected between the discharge control module and the negative terminal of the lowest battery cell is used to The discharge shutdown signal controls the discharge switch module to perform a shutdown operation; the charging control module connected to the positive pole of the battery and the detection unit is used to generate a charging shutdown signal according to the charging control signal; it is connected between the charging control module and the negative terminal of the lowest battery The charging switch module is used to control the charging switch module to perform a shutdown operation according to the charging shutdown signal. The invention solves the problem of many shortcomings in the existing multi-section lithium battery protection chip.