35results about How to "Extended off time" patented technology

The invention discloses a high-broadband envelope line tracking power supply and a control method therefor. The power supply comprises a step wave voltage generation circuit, a control circuit and an A type linear amplifier, wherein the step wave voltage generation circuit consists of n series units connected in series; each series unit consists of m voltage generation circuit units connected in series; according to the method, n groups of m fitted pulse signals within a changing period are selected based on timing sequence; the rising edges of the m fitted pulse signals in any one group are allocated to one group of control signals independently, namely the rising edges are used as the rising edges of the group of control signals; the falling edges of the m fitted pulse signals in any one group are allocated to one group of control signals independently, namely the falling edges are used as the falling edges of the group of control signals; and the switch-on and switch-off time of a switching tube can be effectively expanded in a high-broadband envelope line tracking condition to ensure full switch-on and full switch-off, so as to improve the switching performance and the working reliability of the switching tube in the high-frequency operation and to realize actual high-broadband envelope line tracking.

The invention discloses an IGBT (Insulated Gate Bipolar Translator) power device applied at low power and a manufacturing method thereof. The method comprises the following steps: performing semiconductor impurity injection or diffusion operation on the front side of a silicon substrate; performing corroding treatment on the front side which is subjected to the semiconductor impurity injection or diffusion operation; performing P type ion injection on the back side of the silicon substrate to form a P region; forming a groove on the back side of the silicon substrate; performing N type ion injection on the surface of the groove to form an N region; performing diffusion operation on the P region and the N region; performing an outer layer encapsulating treatment on the silicon substrate. The method has the advantages that by means of groove formation, P type ion injection and N type ion injection on the surface of the groove under the condition of not influencing the voltage endurance capability of the device, the switch-on / off time of a low-voltage IGBT can be prolonged respectively, extremely low startup voltage drop and rapid reverse switch-off recovery are realized.

The invention provides a switch control circuit, a switch circuit and a constant off-time control method. When the on-time of the auxiliary tube reaches the constant off-time, it is detected whether the inductor current is less than the command current; The turn-off time; until the inductor current is less than the command current or less than a certain threshold of the command current, the main tube is turned on and the auxiliary tube is turned off; when the main tube is turned on and the auxiliary tube is turned off, it is detected in real time whether the inductor current exceeds the command current. Then the auxiliary pipe is turned on, and the supervisor is turned off again. The purpose of the present invention is to provide a switch control circuit, a switch circuit and a constant off-time control method, the purpose of which is to realize the voltage stabilization control of the output voltage, thereby realizing the voltage conversion with a smaller duty cycle.

The invention discloses an electro-hydraulic emergency shutdown system for testing procedures, which is characterized by comprising: a plurality of remote control button boxes, which are connected in parallel through multi-core cables; and an electric control panel, which is connected with the plurality of remote control button boxes in parallel. A control button box is connected, and the electric control panel has a data communication interface; a solenoid valve box, which is connected with the electric control panel; an induction gas line, one end of which is connected with the solenoid valve box; a hydraulic control panel, It is connected with the other end of the induction gas line. The invention also discloses a control method for an electro-hydraulic emergency shutdown system used in a testing process. The electro-hydraulic emergency shutdown system is controlled by bus control or signal input to isolate the surface testing process from the testing wellbore, and electrical signals are used to control the electro-hydraulic emergency shutdown system. The control method shortens the response time of the shutdown system.

The invention discloses a rail conveying system for a biochemical analyzer. The rail conveying system comprises a first bracket, wherein the first bracket is provided with a conveying belt assembly and a limit baffle mechanism. The limit baffle mechanism is arranged at the sample outlet end of the conveying belt assembly; the limit baffle mechanism is used for restricting the sample rack on the sample outlet end of the conveying belt assembly; the first bracket is further provided with a pushing mechanism. The pushing mechanism is used for urging the sample rack on the sample outlet end of the conveying belt assembly away from the conveying belt assembly. The rail conveying system can be set horizontally in the biochemical analyzer to realize the butt joint with the longitudinal rail in the biochemical analyzer, so that the buffer amount of the sample rack can be greatly increased on the premise of not increasing the length of the biochemical analyzer.

The invention discloses an LED thyristor phase control dimmer, a method for eliminating flicker and a circuit thereof, wherein the circuit includes a rectification module and a flicker eliminating control module. The anti-flicker control module compares the magnitude of the phase adjustment value of two adjacent rectification cycles, and by prolonging the off time of the LED light string in the rectification cycle with a small phase adjustment value, the LED light string in the rectification cycle with a small phase adjustment value The turn-off time in is consistent with the turn-off time in the rectification cycle with a large phase adjustment value; thus, the turn-on time of the LED light strings in adjacent rectification cycles is the same, eliminating stroboscopic flicker.

The invention discloses a trench gate type insulated gate bipolar translator (IGBT) with a double-face diffusion residual layer and a manufacturing method thereof. The IGBT comprises an N-type base region, a P-type base region, a back P+ collector region, an N+ emitter region, a P+ emitter region, a gate oxide layer, an emitter, a gate electrode and a collector. The N-type base region is composed of an N+ diffusion residual layer, an N- drift region and an N+ buffer layer, wherein the N-type diffusion residual layer, the N- drift region and the N+ buffer layer are stacked up in sequence. The P-type base region is located on the N+ diffusion residual layer. Doping concentration gradually increases outwards from a boundary of the N- drift region with the N+ diffusion residual layer and the N+ buffer layer. The manufacturing method of the IGBT is characterized in that the non-uniform doped N+ layers are formed on the front face and the back face through one-time double-face high temperature deep junction diffusion at the same time, the N+ diffusion residual layer is formed on the front face of the N- drift region, so that the ion doping concentration of the N-type front face is improved, and a conductivity modulation effect is strengthened. The N+ buffer region on the back face can reduce breakover voltage drop of a device, and the turn-off time of the device is prolonged. The manufacturing method can reduce the steps of manufacturing the IGBT, and reduce the cost.

The invention discloses a transport system for a biochemical analyzer, comprising a sample feeding track, a forward track, a recovery track, a sub-track to be tested, an emergency sub-track and a return track; the sample feeding track, the forward track and the recovery track are parallel to each other Setting; said track to be tested, emergency track and return track are provided with at least one track; said track to be measured, emergency track and return track are set between the sample track and the forward track, and The sub-tracks to be tested, the emergency sub-tracks and the return sub-tracks are all perpendicular to the sample injection track and the forward track. The track conveying system can be arranged horizontally in the biochemical analyzer, and can be docked with the longitudinal track in the biochemical analyzer, so that the buffer capacity of the sample rack can be greatly increased without increasing the length of the biochemical analyzer.

The invention provides an insulated gate bipolar transistor, comprising a first base region, a second base region, an emitter region, a gate oxide layer, a buffer region, a first collector region, a second collector region and a third collector region . Wherein, the second base region, the emitter region and the gate oxide layer are sequentially arranged on one side of the first base region, and the buffer zone, the first collector region, the second collector region and the third collector region are sequentially arranged on the first the other side of the base. And the conductivity type of the second base region, the first collector region and the second collector region is opposite to that of the first base region, while the conductivity type of the emitter region, the buffer region and the third collector region are the same as those of the third collector region. The conductivity types of the first base regions are the same. The maximum thickness of the third collector region is equal to the maximum thickness of the second collector region, and the doping concentration of the buffer zone, the first collector region and the third collector region gradually increases to form a bipolar transistor structure.

The invention discloses a series IGBT voltage-sharing method and system based on an auxiliary voltage source. The method comprises the following steps: (1) detecting a port dynamic voltage of each series IGBT; (2) performing dynamic overvoltage diagnosis on the port dynamic voltage of each IGBT; (3) if a dynamic overvoltage exists, providing an emergency high-level signal for the gate of the IGBT;and (4) stopping providing the high-level signal for the gate of the IGBT, and providing a constant voltage for the gate of the IGBT through the auxiliary voltage source. The constant voltage is provided by the auxiliary voltage source, so that the turn-off time of the fault IGBT is prolonged; and the IGBT is turned off synchronously with other IGBTs, so that the purpose of voltage sharing of theseries IGBTs is achieved.

The invention discloses a switched capacitor type high-bandwidth envelope tracking power supply circuit, which includes a step wave voltage generating circuit and a class A linear amplifier, the step wave voltage generating circuit and the class A linear amplifier are connected in cascade, and the step wave voltage generating circuit The output is used as the input of a class A linear amplifier. The ladder wave voltage generating circuit is composed of n switched capacitor circuits with the same structure in series. The switching frequency of the switching tube in each switched capacitor circuit can achieve (1 / n):1 frequency reduction relative to the tracking signal frequency, and at the same time effectively expand The turn-on or turn-off time of the switch tube can be fully turned on or off to improve its working performance and reliability under high-bandwidth tracking conditions; compared with traditional methods, it can greatly reduce the number of power supplies and reduce the complexity of the circuit level and cost, and improve system efficiency.