11results about How to "Achieve shutdown" patented technology

The invention discloses an overload protection method for an audio power amplifier, and relates to the field of audio power amplifiers. According to the invention, the instantaneous output amplitude signal of the power amplifier is divided by the preset overload threshold impedance to obtain the reference current dynamically changing along with the signal, and the actual output current is compared with the reference current in real time, so that the protection criterion is converted from a fixed current threshold to an adaptive impedance threshold; therefore, real-time identification and turn-off of a low-impedance abnormal load are realized, and normal output of a high-peak-factor audio signal is compatible.

This invention discloses an infrared receiver, comprising a photodiode chip, a transistor chip, a resistor, a chip carrier, and a package. The photodiode chip, transistor chip, and resistor are fixed on the top of the chip carrier, and the package surrounds the top of the chip carrier. The bottom of the chip carrier extends out of the package and is provided with a control pin, a collector pin, and an emitter pin. The photodiode chip and the transistor chip are electrically connected. The resistor is connected across the two electrodes of the photodiode chip, and the transistor chip is electrically connected to the control pin, the collector pin, and the emitter pin, respectively. This infrared receiver retains the characteristics of photodiodes, such as a large detection angle, fast response speed, and low temperature drift, while also enabling signal amplification, facilitating control, having short interconnections between components, strong anti-interference capability, and a high signal-to-noise ratio.

The present disclosure provides a freeze protection method of a condensing fan, which can be applied to the technical field of air conditioning system control. The freeze protection method of the condensing fan comprises: collecting the temperature outside a train carriage by using a fresh air temperature sensor arranged at a fresh air outlet of an air conditioning system; collecting the temperature inside the train carriage by using a return air temperature sensor arranged at a return air outlet of the air conditioning system; adjusting the state of a freeze protection switch to an open state when the temperature outside the train carriage does not exceed a first predetermined temperature threshold; adjusting the state of the freeze protection switch to a closed state when the temperature outside the train carriage exceeds the first predetermined temperature threshold; determining the working state of the freeze protection switch according to the temperature outside the train carriage, the temperature inside the train carriage and the state feedback signal of the freeze protection switch; and performing freeze protection on the condensing fan set according to the working state. The present disclosure also provides an air conditioning system and a train.

The application belongs to the technical field of integrated circuits, and discloses a temperature-approximate-independent current reference circuit, which comprises a starting module, a reference current generating module and an output current generating module. The input end of the reference current generating module is connected with the starting module, and a feedback signal is applied to the starting circuit module. The input end of the output current generating module is connected with the output end of the reference current generating module. On the basis of the reference current output, the reference current can be amplified or reduced by one or several groups of current mirrors, so as to obtain one or several groups of temperature-approximate-independent output currents. The application can work in a wide voltage range and output a temperature-approximate-independent current.

This invention relates to the field of electronic circuit technology, and more particularly to an intrinsically safe power supply circuit with high current output, comprising a power input circuit, an output protection circuit, an overvoltage protection circuit, an overcurrent protection circuit, and a current sampling circuit. The power input circuit limits the overall operating power of the power supply circuit, providing first-level voltage and current limiting protection. The current sampling circuit provides second-level current limiting protection. When either the overvoltage or overcurrent protection value exceeds a set value, the corresponding operational amplifier outputs a high level, which can turn on the thyristor in the output protection circuit, providing third-level protection. The overvoltage, overcurrent, and output protection circuits can limit the output to a safe value, allowing the load to operate continuously. In the event of overvoltage, overcurrent, or short circuit at the load side, the circuit can be instantly shut down with low instantaneous energy, resulting in superior safety.

The application discloses a low dropout linear regulator circuit which is mutually started with a bandgap reference circuit, and comprises a pre-starting circuit, an operational amplifier, a first NMOS transistor, and a bandgap reference circuit; the same-phase input end of the operational amplifier is connected with the output end of the pre-starting circuit; the gate of the first NMOS transistor is connected with the output end of the operational amplifier, and the source thereof is communicated with the input end of the bandgap reference circuit, so that an initial output voltage is generated to pre-start the bandgap reference circuit; the output end of the bandgap reference circuit is communicated with the pre-starting circuit, and after pre-starting, the LDO circuit is restarted to obtain a final output voltage, and the mutual starting of the LDO circuit and the bandgap reference circuit is realized. The application solves the problems that the traditional LDO circuit cannot provide stable bias current by itself, and the load capacity and transient response performance of the traditional bandgap reference type LDO circuit are poor, adopts a special mutual starting mechanism, simplifies the pre-starting and shutdown mechanism, improves the load capacity and transient response performance of the LDO circuit, guarantees the stable output voltage, and ensures the normal work of other modules of the system.

The utility model discloses a reactor shutdown system and a reactor pressure vessel pressure stabilizing system. The reactor shutdown system comprises a reactor pressure vessel, a storage tank, a high-pressure gas cylinder group and a pipeline, a cadmium nitrate solution is stored in the storage tank; high-pressure nitrogen is stored in the high-pressure gas cylinder group; the high-pressure gas cylinder group, the storage tank and the reactor pressure vessel are sequentially communicated through a pipeline; according to the utility model, the cadmium nitrate solution in the storage tank is pushed into the reactor pressure vessel by using the high-pressure nitrogen in the high-pressure gas cylinder group, so as to realize shutdown of the reactor pressure vessel; a passive injection mode is adopted, so that the reliability of the system is improved, a reactor shutdown system can still be executed under the condition that a power supply is completely lost, the diversified requirements of the reactor shutdown system means are met, and the reliability of the system is improved; a novel injection material is used, existing pipelines in the system are utilized, a large number of devices are reduced, and the requirement for spatial arrangement is reduced.

The application relates to a direct-acting electromagnetic valve and an assembling method thereof, the direct-acting electromagnetic valve comprising an electromagnetic assembly and a valve body assembly, the electromagnetic assembly comprising a shell, a circuit board, a circuit board protection cover, an inner support, a coil framework, an electromagnetic coil, two wiring terminals, a static iron core, a moving iron core, a moving iron core spring and a coil cover; two lead wires of the electromagnetic coil are respectively electrically connected with the two wiring terminals, and the two wiring terminals are inserted and welded on the circuit board. In the application, the two lead wires of the electromagnetic coil are respectively electrically connected with the two wiring terminals, then the circuit board is inserted into the two wiring terminals in an inserted mode, and the electrical connection between the lead wires and the circuit board is completed; since the circuit board does not need to be turned over to weld the lead wires, the lead wires do not need to be designed to be relatively long, the wiring is more neat, the lead wires do not need to be wound from the side of the circuit board, and the situation that the insulating paint on the lead wires is abraded does not exist, so the technical problems in the prior art are well solved.

The utility model discloses a rocker switch for a high-power dust collector, which is characterized in that a dustproof linkage piece is clamped with a rocker button to form a first physical barrier to prevent dust from entering the rocker switch from a gap of the button, and a partition plate between a linkage inner cavity and a transmission outer cavity is provided with a boss part and an inclined table part to form a barrier type sealing structure. The boss part blocks large-particle dust, the inclined table part guides the dust to two sides, direct invasion paths are reduced, the dustproof structure does not sacrifice operation flexibility, when the seesaw button is pressed downwards, the linkage column drives the conductive assembly to be switched on and off through the coping assembly, quick response is ensured, meanwhile, dust is prevented from being brought into the interior in the operation process, and the service life of the seesaw button is prolonged. Moreover, the dustproof linkage member is directly connected with the rocker button through a clamping structure, and the hinge columns at the two sides of the dustproof linkage member cooperate with the hinge holes of the housing, thereby achieving the quick positioning, integrating the dustproof function into the internal structure of the switch, reducing the number of accessories, and reducing the assembly complexity.

The application provides a CLLC resonant converter soft-start device and method, which comprises a primary side and a secondary side coupled through a transformer, the primary side comprises a first H-bridge; the secondary side comprises a second H-bridge, the opposite switch tubes S1 and S4, S3 and S2 on the first H-bridge are pulsed with the same pulse respectively, and the upper and lower switch tubes on the same bridge arm are alternately conducted; the second H-bridge is uncontrolled rectification, and no driving signal is applied on the corresponding switch tube; the duty cycles of the pulse signal and the complementary pulse signal on the first H-bridge are asymmetrically changed; the pulse signal is the pulse through the switch tube S1 and the switch tube S4; the second pulse is the pulse through the switch tube S3 and the switch tube S2; the current overcurrent during starting is inhibited, the purpose of smoothly establishing the output voltage is achieved, the ZVS opening characteristic is achieved, and the ZCS closing of half of the diodes on the rectification side is always ensured, and the high-frequency oscillation of the resonant current caused by the participation of the parasitic capacitor in the resonance can be avoided.

The utility model provides a novel switch control circuit, it includes switch control end, voltage division circuit formed by resistance R1, R2 series connection, 12V direct current power supply, power output end, P channel field effect tube Q1 and NPN type triode Q2, the grid of field effect tube Q1 is connected with the collector of triode Q2 through resistance R3, the source of field effect tube Q1 is connected with 12V direct current power supply, the drain of field effect tube Q1 is connected with power output end, resistance R1, R2 are connected between 12V direct current power supply and ground in proper order, switch control end is connected with the connecting point of resistance R1, R2, and is connected with the base of triode Q2 through resistance R4, the collector of triode Q2 is still connected with 12V direct current power supply through resistance R5, the emitter of triode Q2 is grounded. The novel switch control circuit of the utility model can connect two different circuit modules directly.