7results about How to "Reliable shutdown" patented technology

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.

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.

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 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.