45 results about "Stress protection" patented technology

A circuit for protection of a transceiver input includes an input transistor and a first resistor connected between the drain of the input transistor and an input node. A plurality of reverse-biased diodes connected between a supply voltage and the input node. An output node is connected to the source of the input transistor. A first forward-biased diode connected between the power supply and the plurality of reverse-biased transistors. A second forward-biased diode and a second resistor are connected between the first forward biased transistor and the gate of the input transistor. A pre-driver circuit includes first and second transistors forming a differential pair and driven by a differential input voltage. A third transistor is connected between sources of the first and second transistors and ground. First and second resistors are connected to drains of the first and second transistors, respectively. A fourth transistor is connected between a power supply voltage and the first and second resistors. Fifth and a sixth transistors are connected in series between the power supply voltage and the first and second resistors, wherein a node between the fifth and second transistors is connected to a gate of the fourth transistor.

One embodiment of the invention relates to a circuit for over-stress protection. The circuit includes a temperature rate sensor configured to monitor the temperature of a semiconductor device during a first state. The circuit is further configured to selectively switch the semiconductor device from the first state to a second state if the temperature increases at a rate that has a predetermined relationship with a temperature rate function. Other methods and systems are also disclosed.

One embodiment of the invention relates to a circuit for over-stress protection. The circuit includes a temperature rate sensor configured to monitor the temperature of a semiconductor device during a first state. The circuit is further configured to selectively switch the semiconductor device from the first state to a second state if the temperature increases at a rate that has a predetermined relationship with a temperature rate function. Other methods and systems are also disclosed.

A helicopter having a helicopter turbine engine disposed therein includes an over-stress protection system. The over-stress protection system includes a computer for storing data and an input such as a keyboard for inputting a safe temperature profile for starting the turbine engine. A temperature sensor is provided for measuring the actual turbine outlet temperature during the start up of the helicopter turbine engine. The actual engine temperature is then compared with the safe engine temperature profile and water and / or alcohol is injected into the engine when an actual temperature exceeds the safe temperature. The use of a ground based tank for use during start up and an airborne tank for in flight use are also disclosed.

The invention provides a double-door escape door lock which comprises a lock groove, electromagnet, a touch switch, a strip-shaped door lever and a door lever mounting body, wherein one end of the strip-shaped door lever is articulated with the door lever mounting body, and the other end thereof is provided with an electromagnet absorbing plate; the electromagnet and the touch switch are respectively installed in the lock groove; an absorbing end of the electromagnet is arranged correspondingly to one side of the electromagnet absorbing plate; the touch switch is arranged correspondingly to one side of the electromagnet absorbing plate; the touch switch is connected in an electromagnet power supply circuit; the lock groove is internally provided with a stress protection clip which is provided with a concave-arc-shaped inner side wall; and the concave-arc-shaped inner side wall is arranged correspondingly to the strip-shaped door lever. The door lock has the advantages of simple structure, ingenious design, convenient use, firm locking, convenient and fast opening of a door, safety and reliability.

The invention discloses a high-reliability image sensor packaging structure with a stress protection structure and belongs to the field of image sensor packaging. The high-reliability image sensor packaging structure comprises a cover plate, a wafer, an image sensing area, welding discs, bonding glue, a passivation layer, a metal layer and a solder mask layer, a cavity structure is formed on the front of the cover plate, the wafer comprises a wafer front and a wafer back, both the image sensing area and the welding discs are distributed on the wafer front, the welding discs are distributed around the image sensing area and realize breakover, the bonding glue is positioned between the cover plate and the wafer and bonds the same together, and the passivation layer, the metal layer and the solder mask layer are sequentially formed on the back of the wafer. Breakover between the welding discs on the front of the wafer and solder balls on the back of the wafer is realized through a redistribution line layer formed by the above structure. Thickness of the packaging structure is lowered, stress in the metal layer is reduced, cutting process yield is increased, and packaging reliability is improved.

A helicopter having a helicopter turbine engine disposed therein includes an over-stress protection system. The over-stress protection system includes a computer for storing data and an input such as a keyboard for inputting a safe temperature profile for starting the turbine engine. A temperature sensor is provided for measuring the actual turbine outlet temperature during the start up of the helicopter turbine engine. The actual engine temperature is then compared with the safe engine temperature profile and water and / or alcohol is injected into the engine when an actual temperature exceeds the safe temperature. The use of a ground based tank for use during start up and an airborne tank for in flight use are also disclosed.

The invention relates to the field of spoke production equipment, in particular to a spoke thread rolling machine. The spoke thread rolling machine mainly consists of a main motor, a first belt wheel, a main shaft, a differential mechanism, a feeding groove, a small motor, a sliding block, an aligning mechanism, a static tooth plate seat and a thread rolling plate, wherein the main shaft is horizontally arranged; the first belt wheel is connected with one end of the main shaft, and is connected with the main motor; the other end of the main shaft is connected with the sliding block; the thread rolling plate is arranged on the upper end surface of the sliding block; the feeding groove is arranged above the main shaft; one side of the feeding groove is connected with the small motor; the aligning mechanism is arranged on the other side of the feeding groove; the static tooth plate seat is arranged on the other side of the aligning mechanism. Through the adoption of the structure, the main shaft can be subjected to stress protection by utilization of a differential motor, so that the overall service life of the thread rolling machine can be prolonged; the position of a spoke to be subjected to thread rolling can be adjusted by utilization of the aligning mechanism, so that the position accuracy can be ensured, the quality of a thread rolling finished product can be improved, and the finished product yield can be improved.

The invention discloses a conveying device for luggage. The conveying device for the luggage comprises a locking screw plate, a partition plate, an uphill plate, a draw-bar box protection device, a connector, a conveying belt, a connecting shaft, a supporting plate and supporting columns, wherein the draw-bar box protection device is provided with a mechanical fixing device, a triggering startingdevice, a screw connecting device, a limiting device, an electromagnet device and a stress protection device. The conveying device for the luggage has the beneficial effects that through the arrangeddraw-bar box protection device, when a draw-bar box is conveyed by the conveying device, the draw-bar box is placed in the protection device to fix and limit the draw-bar box, and the damage caused byfriction between the surface of the draw-bar box and the conveying device is prevented; the stress protection device is arranged in the conveying device to limit a telescopic rod of the draw-bar box,the telescopic rod is prevented from lengthening during transportation, the transportation efficiency of the conveying device is improved, and the probability of draw-bar box damage is reduced.

The invention provides a double-door escape door lock which comprises a lock groove, electromagnet, a touch switch, a strip-shaped door lever and a door lever mounting body, wherein one end of the strip-shaped door lever is articulated with the door lever mounting body, and the other end thereof is provided with an electromagnet absorbing plate; the electromagnet and the touch switch are respectively installed in the lock groove; an absorbing end of the electromagnet is arranged correspondingly to one side of the electromagnet absorbing plate; the touch switch is arranged correspondingly to one side of the electromagnet absorbing plate; the touch switch is connected in an electromagnet power supply circuit; the lock groove is internally provided with a stress protection clip which is provided with a concave-arc-shaped inner side wall; and the concave-arc-shaped inner side wall is arranged correspondingly to the strip-shaped door lever. The door lock has the advantages of simple structure, ingenious design, convenient use, firm locking, convenient and fast opening of a door, safety and reliability.

A circuit for protection of a transceiver input includes an input transistor and a first resistor connected between the drain of the input transistor and an input node. A plurality of reverse-biased diodes connected between a supply voltage and the input node. An output node is connected to the source of the input transistor. A first forward-biased diode connected between the power supply and the plurality of reverse-biased transistors. A second forward-biased diode and a second resistor are connected between the first forward biased transistor and the gate of the input transistor. A pre-driver circuit includes first and second transistors forming a differential pair and driven by a differential input voltage. A third transistor is connected between sources of the first and second transistors and ground. First and second resistors are connected to drains of the first and second transistors, respectively. A fourth transistor is connected between a power supply voltage and the first and second resistors. Fifth and a sixth transistors are connected in series between the power supply voltage and the first and second resistors, wherein a node between the fifth and second transistors is connected to a gate of the fourth transistor.

The embodiment of the invention discloses a pressure motion protection method of a breast X-ray machine. The method includes the steps that current pressure output by a drive mechanism of a drive pressure application device of the breast X-ray machine is collected; a current maximum pressure protection value corresponding to the current pressure is determined according to a mapping relation between the pressure and the maximum pressure protection value, wherein the current maximum pressure protection value is smaller than or equal to a final maximum pressure protection value; drive control parameters are calculated according to the current maximum pressure protection value; the drive mechanism is controlled to output pressure which is not larger than the current maximum pressure protection value according to the drive control parameters. The embodiment of the invention further discloses a pressure motion protection device of the breast X-ray machine and a breast X-ray machine system. By the adoption of the technical scheme, damage to detected patients can be reduced or avoided.

The invention discloses a digital non-electric-quantity protection method for an oil-immersed transformer based on pressure characteristics. The method comprises the following steps: firstly, when theoil-immersed transformer runs, acquiring a pressure instantaneous value P(t) at an installation position of a pressure sensor of the protected oil-immersed transformer in real time, and starting a pressure relay when the pressure instantaneous value P(t) is greater than a pressure relay starting threshold value Pst; secondly, adopting different action strategies according to the pressure instantaneous value P(t): when the pressure instantaneous value P(t) is greater than a protection action No. 2 threshold value Pth_2, determining that a serious fault occurs in the oil-immersed transformer, instantaneously performing pressure protection, and tripping off a circuit breaker; when the pressure instantaneous value P(t) is greater than a protection action No.1 threshold value Pth_1 and less than the protection action No.2 threshold value Pth_2, continuing to judge whether P(t+delta(t)) is still greater than the Pth_1 or not after time delay delta(t), determining that the fault is an internal fault if the requirement is met, performing the pressure protection and tripping off the circuit breaker; otherwise, performing no operation of the pressure protection. The method can effectively distinguish the internal fault and the external disturbance state of the transformer, and improves the pressure protection reliability.