12results about How to "Reliable shutdown" patented technology

The invention relates to a direct-current circuit breaker based on a thyristor and an on-off method of the direct-current circuit breaker, and belongs to the technical field of direct-current middle-high voltage power system fault protection. The direct-current circuit breaker comprises a main switch branch, a current transfer branch, a voltage-limiting energy consumption branch and a pulse commutation loop, the direct-current circuit breaker is connected with a power system in series, and the main switch branch is connected with the current transfer branch. Two nodes connected in series are respectively marked as Q1 and Q2, the main switch branch and the voltage-limiting energy consumption branch are connected in parallel through the Q1 and Q2, one ends of secondary sides of two high-frequency transformers in the pulse commutation loop are respectively connected to the Q1 and Q2, and the other ends of the secondary sides of the two high-frequency transformers in the pulse commutation loop are respectively connected to two ends of the current transfer branch. The problem that in the prior art, a large number of pulse charging and discharging loops are configured for meeting the fault large-current breaking requirement, and consequently the size and cost are increased is effectively solved.

A kind of high reliability anti-reverse connection circuit suitable for redundant dual controller, increase high side MOS gate auxiliary circuit and sensor low side MOS control circuit.When power is connected, auxiliary circuit does not work;When power is reversed, triode T1, T2 is turned on, and then the gate voltage of MOS Q1, Q2 is pulled to the GND of reverse connection, so that the gate-source voltage of Q1, Q2 is lower than threshold value, to ensure the reliable and stable turn-off of MOS on power bus, at the same time, the gate voltage of MOS Q3, Q4 is also pulled to the GND of reverse connection, so that the gate-source voltage of Q3, Q4 is lower than threshold value, to ensure the reliable and stable turn-off of MOS on sensor ground wire.Diode D1 and D2 realize that this part of circuit does not conduct when power is connected, and only works when power is reversed, resistance RH and RL provide base bias voltage of triode and play the role of current limiting.This application realizes the high reliability anti-reverse protection of redundant dual controller system and external common ground sensor through the distributed configuration of high and low side MOS on the input end of automobile main load power supply and the backflow end of sensor ground wire and the design of targeted auxiliary circuit, and the anti-reverse circuit design scheme suitable for redundant dual controller can effectively realize the high reliability anti-reverse protection.

The utility model discloses an isolation driving power supply circuit comprising a DC power supply, a first MOS tube, a second MOS tube, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a first diode, a second diode, a voltage-regulator tube and a transformer. One end of the secondary side of the transformer is connected with the positive electrode of the second diode, and the negative electrode is connected with one end of the third capacitor; the other end of the secondary side of the transformer is also connected with one end of a fourth capacitor and one end of a fifth capacitor, the other end of the fourth capacitor is connected with the cathode of a voltage-regulator tube, the other end of the fifth capacitor is connected with the anode of the voltage-regulator tube and the anode of a first diode, and the cathode of the first diode is connected with one end of the secondary side of the transformer; the two ends of the third capacitor are used for being connected with a first IGBT drive circuit, and the two ends of the fourth capacitor are used for being connected with a second IGBT drive circuit.

This invention provides a high-voltage, high-capacity autotransformer, comprising: a supporting capacitor, an energy buffer bridge arm, and a converter valve assembly. The supporting capacitor forms part of the power transmission loop; the energy buffer bridge arm realizes the main power transmission and forms another part of the power transmission loop; the transformer commutation is achieved by controlling the number of bridge arm sub-modules engaged in the energy buffer bridge arm and the trigger signal of the converter valve assembly. The invention also provides a commutation operation method and a control method for this transformer. This invention realizes energy transfer from the low-voltage side to the high-voltage side, improves transformer efficiency, and achieves energy balance in the energy buffer bridge arm; by controlling the number of energy buffer bridge arm sub-modules engaged, reliable shut-off and near-zero voltage conduction of the converter valve are achieved, while providing two closed-loop modes: DC voltage and power control. This invention realizes a high-voltage, high-capacity DC transformer, and by using a semi-controlled converter valve, reduces device costs.

The invention relates to an integrated high-voltage semiconductor device structure and a manufacturing method thereof. The device comprises an N-type epitaxial layer on an N-type substrate, drain electrode metal is arranged on the back surface of the N-type epitaxial layer, the structure of the device is divided into an M1 device region, an M2 device region and an isolation region, P-type columns are arranged in the N-type epitaxial layer, and a P-type body region is arranged above the P-type columns and is connected with N-type and P-type source electrodes with different doping; an M2 device region is provided with a threshold adjustment region, and the surface of the device is covered with a gate oxide layer and a polycrystalline silicon gate; the dielectric layers are respectively distributed in each region; the M1 source electrode metal and the M2 source electrode metal are connected with the source electrode of the P-type body region; the isolation region is provided with a diode, anode metal is connected with an N-type source electrode, cathode metal is connected with a P-type source electrode, or second grid polycrystalline silicon is arranged and is respectively connected with heavily-doped N-type polycrystalline silicon, heavily-doped P-type polycrystalline silicon and cathode and anode metal. According to the invention, the loss of circuit topology is reduced, and the system efficiency and integration are improved.

A multifunctional purge valve special for a nuclear power station diesel engine comprises a valve body with the cross section of a T-shaped structure, a valve element body moving up and down is installed in the valve body in a matched mode, three channels are formed in the valve body, and openings of the channels include an inlet A, an outlet B and a bypass opening C; the top faces of the valve element body and the valve body are provided with valve decks in a matched mode at the same time, and air inlet channels are formed in the middles of the valve decks. A groove is formed in the middle of the upper portion of the valve body, a sliding rail is installed on the inner wall face of the groove, a protruding structure matched with the sliding rail is arranged on the upper portion of the valve element body, a vent hole is further formed in the protruding structure, the vent hole is communicated with the inner space of the groove, and meanwhile the vent hole is communicated with the air inlet channel. The air channel is communicated with the vent hole; the bottom of the valve element body is connected with the valve body through the reset spring, the efficient blowing function can be effectively achieved, meanwhile, the good sealing performance and operation convenience are achieved, and use is flexible and convenient.

This utility model discloses a manual / automatic triggering device, including a device body, a manual operating mechanism, and an automatic trigger. The manual operating mechanism includes a movable contact component and an operating end. The device body includes a limiting window and a slider. The slider is placed in the limiting window. The movable contact component and the operating end are connected by the slider. When the operating end slides, it causes the movable contact component to contact the automatic trigger, and the automatic trigger is activated. When the operating end slides, it causes the movable contact component to separate from the automatic trigger, and the automatic trigger is deactivated. The limiting window limits the slider, allowing the movable contact component to continuously trigger the automatic trigger.

The invention provides a voltage bleeder circuit suitable for positive and negative voltage output VCOM and a display driving chip, and the voltage bleeder circuit comprises a bleeder unit which is connected between the output end of the VCOM and a reference ground, and is used for discharging the positive voltage or the negative voltage of the output end of the VCOM to the reference ground in a bleeder mode; the control unit is connected to the control end of the discharge unit and is used for adaptively generating a grid control voltage according to the voltage polarity of the VCOM output end in a discharge mode so as to control the discharge unit to be conducted; wherein the discharge unit is in a turn-off state during normal work, and is turned on in response to grid control voltage in a discharge mode, so that self-adaptive discharge of positive voltage or negative voltage is realized. The voltage discharge circuit is low in cost, can rapidly and safely discharge the output voltage, protects the safety of devices, can be widely applied to various liquid crystal display driving chips, and has very high industrial practical value.

The utility model discloses a reel protection mechanism of an airport air conditioner hose winding and unwinding vehicle, and relates to the technical field of airport air conditioner hose winding and unwinding vehicles, the reel protection mechanism of the airport air conditioner hose winding and unwinding vehicle comprises a speed measuring gear and a rotating speed sensor which are integrally arranged on a vehicle body, and the rotating speed sensor is fixedly installed by facing teeth of the speed measuring gear through a support; a speed measuring gear wheel speed signal detected by the rotating speed sensor is transmitted to the programmable controller, the output end of the programmable controller is connected with the input end of the safety relay, the output end of the safety relay is connected with the input end of the contactor, and the output end of the contactor is connected with the input end of the motor power source. And the programmable controller controls the winding motor to start and stop through on-off of a motor power supply. The speed measuring gear and the rotating speed sensor are arranged to monitor the rotating speed condition of the winding disc, when it is monitored that the rotating speed is lower than a set threshold value, jamming is judged, a motor power source is cut off, it is ensured that the winding motor is reliably shut down when a fault occurs, and protection on the winding motor is achieved.

The invention discloses a normally-off diamond field effect transistor and a preparation method thereof, and relates to the field of semiconductor devices, the normally-off diamond field effect transistor comprises a diamond substrate, the surface of which is provided with a hydrogen terminal and forms a conducting channel formed by two-dimensional hole gas; a device isolation region surrounding the conductive channel; the source electrode and the drain electrode are arranged at the two ends of the conducting channel; the fixed charge regulation and control region is arranged between the source electrode and the drain electrode; a covering gate dielectric layer is arranged on the upper side of the fixed charge regulation and control region; the gate electrode is arranged above the gate dielectric layer; the method has the beneficial effects that the density of surface positive charges can be accurately controlled by regulating and controlling parameters of deposition processes such as corona discharge, so that the fine adjustment of the depletion degree of the two-dimensional hole gas is realized, and finally, the quantitative and controllable setting of the threshold voltage of the device is realized to meet the requirements of different circuit applications.

The invention provides a current turn-off device and a control method thereof. The current turn-off device comprises a first through-current branch which comprises at least two groups of mechanical switches and non-linear resistors which are connected in series and connected in parallel; a second through-flow branch; a first transfer branch; a second transfer branch; the energy consumption branch comprises a non-linear resistor or at least two non-linear resistors which are connected in series, the first through-current branch is connected with the first transfer branch in series to form a first bridge arm, the second through-current branch is connected with the energy consumption branch in series to form a second bridge arm, and the first bridge arm, the second bridge arm and the second transfer branch are connected in parallel; the electric reactor unit and the self-excitation module unit are connected in series in a parallel loop of the first bridge arm and the second transfer branch, and the electric reactor unit is connected in series in the first through-flow branch, the first transfer branch or the second transfer branch; and the self-excitation module unit is connected in series in the first through-flow branch, the first transfer branch or the second transfer branch.

The application provides a kind of photovoltaic system and switch-off device, the input side and output side of the switch-off device are respectively arranged at the two sides of the power transmission branch in the switch-off device, and at least one first switch tube and at least one second switch tube are arranged in series in the power transmission branch; although the body diode or anti-parallel diode of the first switch tube allows reverse current to flow into the positive electrode of the input side of the switch-off device, when the control unit detects that the output current of the switch-off device is the reverse current, the second switch tube is controlled to be disconnected to cut off the reverse current; when the group string is connected in parallel with the group string of different voltage, even if the reverse current occurs, it can be cut off in time, and finally the reliable switch-off under the communication control scheme is realized.