490 results about "Snubber" patented technology

A control device (100) for controlling a number N, with N ≥ 1, of actuators (200) for actuating N optical elements of an optical system, comprising a control node (K2) coupling to the actuator (200) for providing a control voltage (V2) for the actuator (200), an amplifier (110) configured to receive a supply voltage (V1) provided at an input node (K1) and to provide an output voltage (V3) at an output node (K3), wherein the amplifier (110) comprises a plurality M, with M ≥ 2, of current sources (111, 112) comprising at least one charge-controlled current source (112) and a holding capacitor (113) for maintaining the level of the provided output voltage (V3), and a buffer coupled between the output node (K3) and the control node (K2). (120), which is designed to,to decouple the control node (K2) from the output node (K3) and to provide the control voltage (V2) for the actuator (200) based on the level of the output voltage (V3) of the holding capacitor (113).

A two-transistor flyback topology in which a portion of leakage inductance energy in the transformer is extracted and used to obtain zero voltage switching on both switching elements in any operating conditions, and in which a third low power switch eliminates parasitic oscillations and allows an operation at a determined frequency. In this topology, there are no switching losses and there are no spikes or glitches in any switching node, eliminating the need for snubbers. This topology is an “ideal two transistor flyback topology.”

This disclosure describes a non-dissipative snubber circuit configured to boost a voltage applied to a load after the load's impedance rises rapidly. The voltage boost can thereby cause more rapid current ramping after a decrease in power delivery to the load which results from the load impedance rise. In particular, the snubber can comprise a combination of a capacitive element, two inductive elements, and three switches, where a duty cycle of two of the three switches controls the voltage boost. The snubber can be arranged between a DC power supply and a switching circuit configured to generate a pulsed waveform for provision to the load.

The invention relates to a closing buffer of a vacuum circuit breaker. The closing buffer comprises phase columns, a cross beam, a spring operating mechanism and a bracket, the three phase columns are arranged at the top end of the cross beam in parallel, and the top end of the support is connected to the lower surface of the cross beam and used for supporting the cross beam. The spring operating mechanism is mounted on the lower surface of the cross beam, and the spring operating mechanism is linked with the vacuum arc extinguish chamber in the phase column through a transmission module; through specially designed guiding and spring contact force values, functional requirements of guiding and contact pressure providing are realized. A closing buffer is additionally arranged in the spring contact, damping of a rigid closing point is increased through the buffer, energy of collision bounce of the rigid closing point is absorbed, and therefore bounce is restrained.

The invention relates to the technical field of transformers, in particular to a power electronic transformer with a shielding structure, which mainly comprises a transformer body, a radiator is fixedly mounted on the side surface of the transformer body, a cooling fan is fixedly mounted at the end part of the radiator, and a weak current box is fixedly mounted at the end part of the transformer body. Double oil mist separation is achieved through the deoiler, one is that spiral ascending airflow is formed through guiding of the jet pipe, oil mist in gas is removed according to the centrifugal demisting principle, and the other is that residual oil mist in the gas is secondarily intercepted through the filter element pipe, so that the oil mist in respiratory airflow can be effectively removed, the oil mist interception efficiency is remarkably improved, and the oil mist separation efficiency is greatly improved. Meanwhile, the elastic membrane of the buffer can absorb sudden pressure change of the oil conservator through elastic deformation, so that the pressure fluctuation amplitude is reduced when the load changes suddenly, pulverization or structural damage of the drying agent caused by strong airflow impact is avoided, it is ensured that the moisture absorption drying agent is always in a clean and stable working environment, and the efficient dehumidification capacity is maintained.

The present disclosure relates to a solid insulated switch using a semiconductor; comprising a main circuit unit connected between systems on both sides thereof, and which has a first semiconductor and a second semiconductor arranged in a series; a snubber circuit having a capacitor and a resistor arranged in a series, one end connected in parallel to the front end of the first semiconductor switch, and the other end connected in parallel to the rear end of the second semiconductor switch; a freewheeling circuit, having a diode and a resistor arranged in a series, one end connected to a common contact between the first semiconductor switch and the second semiconductor switch, and the other end connected to the ground; and a mechanical switch for ensuring physical insulation after fault current interruption.

The invention discloses a low-power-consumption small-area on-chip temperature sensor based on an MOS tube and a method thereof. Comprising a temperature sensing circuit and an analog-to-digital conversion circuit which are connected with each other, the temperature sensing circuit is used for generating a voltage signal related to the temperature and outputting the voltage signal to the analog-to-digital conversion circuit to achieve digital quantization of the temperature, and the output end of a CTAT branch is connected to the input end of a switched capacitor amplifier through a buffer. The output end of the switched capacitor amplifier is connected to the non-inverting input end of the comparator, the output end of the PTAT branch is connected to the inverting input end of the comparator, the output end of the comparator is connected with the input end of the successive approximation logic unit, and the output end of the successive approximation logic unit is connected to the switched capacitor amplifier. According to the temperature sensing circuit structure, the problem of power supply sensitivity existing when voltage is generated is effectively solved, reference signals do not need to be additionally generated in the quantization process, and the problem of error accumulation is avoided.

The invention discloses an electromagnetic repulsion switch with three opening modes. The electromagnetic repulsion switch comprises an arc extinguish chamber shell, a static contact, a moving contact, a corrugated pipe, a transmission rod, an electromagnetic repulsion mechanism, a bistable spring retainer and a hydraulic buffer. Wherein the electromagnetic repulsion mechanism is composed of an opening coil, a moving coil, a closing coil and discharging circuits thereof, the discharging circuit of each group of coils comprises a discharging capacitor, a thyristor and a fly-wheel diode, the upper end and the lower end of the discharging circuit are respectively connected with leads on the outer side and the inner side of each coil, and the discharging circuits are mutually independent. According to the electromagnetic repulsion switch provided by the invention, the corresponding thyristors can be controlled to switch different opening modes according to working conditions, so that the stress and charging and discharging requirements of the electromagnetic repulsion switch under a constant-speed opening working condition are reduced, and meanwhile, a single-capacitor constant-speed driving mode and a double-capacitor rapid driving mode can be used as a backup scheme or a rapid reclosing scheme; and the reliability and the mechanical life of the electromagnetic repulsion switch are obviously improved, so that the application range of the electromagnetic repulsion switch is wider.

A triple-active bridge (TAB) converter and methods to optimize the same is disclosed. The TAB converter includes a high-frequency three-winding transformer and three active full bridges, each coupled to the high-frequency transformer through a different passive network. The converter also includes a centralized controller providing gating pulses to semiconductor switches within the active full bridges, a power pulsating buffer (PPB) configured to reduce capacitor requirements on the DC port, and an unfolder stage to convert rectified AC voltage to a pure sine wave. The centralized controller may optimize performance by varying at least one of a switching frequency, a duty cycle of bridge voltages, and a phase shift between bridge voltages. The PPB may include a buck active power decoupler with a half-bridge, inductor, and capacitors, and also a primary full bridge and a power transfer impedance block.

Circuits and methods are provided for an input hysteresis buffer that includes a voltage limiting unit, a voltage detecting unit connected to the voltage limiting unit, and a supply tracking bias unit connected to the voltage detecting unit. The voltage liming unit comprises a first voltage limiting unit and a second voltage limiting unit. The voltage detecting unit comprises a first voltage detecting unit configured to detect the presence of a first threshold voltage in an input signal, and a second voltage detecting unit configured to detect the presence of a second threshold voltage in the input signal. The supply tracking bias unit is configured to supply a control signal to the voltage detecting unit.

The invention provides a transient enhancement buffer and a gamma voltage generation system, and the transient enhancement buffer comprises an input module, an output module and a transient enhancement module which are sequentially connected. The input module is used for acquiring an amplified signal; the transient enhancement module generates a pull-up coupling signal and a pull-down coupling signal based on the fluctuation of the output signal; and the output module performs coupling enhancement on the amplified signal through the pull-up coupling signal and the pull-down coupling signal, so that the stability of the output signal is improved. Meanwhile, the gamma voltage generating system comprises an amplitude adjusting device, a region dividing device, a linear output device, a high-nonlinearity output device and a low-nonlinearity output device, the maximum and minimum values of the voltage are determined through the amplitude adjusting device, and voltage values of three regions are output through the linear output device, the high-nonlinearity output device and the low-nonlinearity output device. Therefore, the output voltage value is highly overlapped with the actual voltage value distribution of the gamma voltage, so that the accuracy is improved.

The invention discloses a bidirectional power electronic switch, a hybrid DC circuit breaker and a control method. The bidirectional power electronic switch comprises a diode bridge module, a buffer circuit, a voltage limiting circuit and an impedance adjusting circuit. The impedance adjusting circuit is connected in parallel with two ends of the diode bridge module; the buffer circuit is connected in parallel with a breaking electronic switch in the diode bridge module; the voltage limiting circuit is connected in parallel with two ends of the breaking electronic switch; the diode bridge module controls the breaking electronic switch to switch current according to a breaking instruction of the power system; when the breaking electronic switch is locked, the buffer circuit suppresses the voltage and current changes of the breaking electronic switch in the switching process, the voltage limiting circuit limits the overvoltage level of the breaking electronic switch, and the impedance adjusting circuit reduces the oscillation frequency. The impedance adjusting circuit reduces the oscillation frequency, reduces the requirement for the reverse recovery speed of the diode, reduces the stress of the diode bridge type module, and enables a conventional common diode to be not liable to be damaged.

A power semiconductor circuit is provided for clamping the voltage across the circuit during a fault. The circuit may include a power semiconductor switch, a clamping branch coupled in parallel with the power semiconductor switch, a snubber branch coupled in parallel with the power semiconductor switch and the clamping branch, and an isolation switch coupled in series with the power semiconductor switch. The clamping branch may include a first capacitor and a surge arrester coupled in parallel with a first resistor. The first capacitor may be coupled in series with the surge arrester and the first resistor. The snubber branch may include a second capacitor, a plurality of resistors, and a diode.

The invention relates to a buffer and an integrated circuit. The buffer includes: an operational amplifier; the first end of the voltage-voltage feedback network is coupled to the positive phase / negative phase input end of the operational amplifier; the first end of the isolation resistor is coupled to the output end of the buffer; the first group of switches and the second group of switches are controlled to be closed when the first capacitive load is driven, the second group of switches are disconnected when the second capacitive load is driven, and the first group of switches are disconnected and the second group of switches are closed when the second capacitive load is driven; in the first load, the output end of the operational amplifier is coupled to the output end of the buffer through at least one switch in the first group of switches, and the second end of the voltage-voltage feedback network is coupled to the output end of the buffer through at least one switch in the first group of switches. In the second load, the output end of the operational amplifier is coupled to the second end of the isolation resistor through at least one switch in the second group of switches, and the second end of the voltage-voltage feedback network is coupled to the output end of the operational amplifier through at least one switch in the second group of switches.

Each of stages of a gate driver includes a first pull-up control circuit applying a previous carry signal to a first control node, a buffer circuit outputting a gate clock signal, and a pull-down circuit outputting a second low voltage. The first pull-up control circuit includes a fourth-first transistor including a control electrode connected to a previous carry input node, a first electrode connected to the previous carry input node, and a second electrode connected to a second control node, a fourth-second transistor including a control electrode connected to the previous carry input node, a first electrode connected to the second control node, and a second electrode connected to the first control node, a first inter-node capacitor connected between the previous carry input node and the second control node, and a second inter-node capacitor connected between the second control node and the first control node.

The invention discloses an LDO (Low Dropout Regulator) circuit based on current feedback, which comprises a transconductance amplifier for amplifying reference voltage into current and inputting the current into a positive phase input end of an error transresistance amplifier; the error transimpedance amplifier, the buffer, the second PMOS transistor, the first PMOS transistor and the current-current feedback network form an error current feedback loop, the negative phase input end of the error transimpedance amplifier receives feedback current from the current-current feedback network, and the output end of the error transimpedance amplifier outputs error voltage; the buffer receives the error voltage output by the error trans-impedance amplifier, generates a buffer stage output voltage and drives the second PMOS tube to generate an output voltage; the first PMOS transistor is used for detecting fluctuation of output voltage, if the output voltage fluctuates, current flowing through the first PMOS transistor changes, the current-current feedback network generates feedback current according to the current change of the first PMOS transistor, the feedback current is input to the negative phase input end of the error trans-impedance amplifier, and fluctuation of the output voltage is counteracted.

The invention relates to the technical field of emergency protection circuits, and provides an EEG pre-amplification circuit and brain-computer interface equipment. The buffers are connected in parallel, and the corresponding input ends of the buffers are connected with the electrode sensors; the buffer is a four-channel unity gain buffer; the input end of the electrostatic protection diode array is connected with the positive electrode and the negative electrode of a preset power supply, and the input end is further connected between the corresponding input ends of the buffers and the electrode sensor; the first filtering capacitor is connected with the first voltage stabilizing capacitor in parallel, the second filtering capacitor is connected with the second voltage stabilizing capacitor in parallel, the input ends of the first filtering capacitor and the first voltage stabilizing capacitor are connected with the positive electrode of a preset power supply, and the input ends of the first filtering capacitor and the first voltage stabilizing capacitor are connected with a preset grounding end; the input ends of the first filtering capacitor and the first voltage stabilizing capacitor are connected with the negative electrode of the preset power supply, and the input ends are connected with the preset grounding end, so that the power supply noise corresponding to the preset power supply is minimized.

A current measurement system, comprising a plurality of parallel sensing circuits, each sensing circuit configured to measure a respective range of voltage corresponding to a current through a load, wherein each sensing circuit is triggered to initiate measurement of a voltage across the load in response to a buffer current through a common buffer reaching a respective threshold, a buffer circuit for inputting a virtual ground voltage or a virtual ground current to the load and to the plurality of parallel sensing circuits, the virtual ground voltage corresponding to the voltage across the load or the current through the load, and a processor coupled to the plurality of parallel sensing circuits, wherein the processor is configured to combine data representing voltage measurements from the plurality of parallel sensing circuits to determine the current through the load.

A micro-electrical-mechanical system (MEMS) piezoelectric autofocus actuator includes: a fixed stage that is stationary; a moving stage that is movable along a travel direction (Z-axis); a motion control system coupling the fixed stage to the moving stage and including motion control springs; piezoelectric bending elements configured to deform the motion control system and thereby control a precise position of the moving stage relative to the fixed stage; and integrated piezoelectric motion stops that are actuatable to restrict out-of-plane motion of the moving stage along the travel direction (Z-axis). In another example, a MEMS piezoelectric autofocus actuator includes integrated motion limiting snubbers configured to limit in-plane motion of the moving stage; integrated motion stoppers configured to restrict out-of-plane motion of the moving stage along the travel direction (Z-axis); and assembled motion stoppers disposed in assembly slots and configured to restrict out-of-plane motion of the moving stage along the travel direction (Z-axis).

According to the buffer output control circuit, the buffer output control method and the LDO circuit applying the buffer output control circuit, the second control signal generation circuit and the second transistor are arranged, and in the dropout state, the second control signal generation circuit generates the high-level second control signal based on the error amplification signal to control the second transistor to be switched on; the potential of the control end of the power tube is pulled down to the ground, the problem of voltage loss on the control end of the power tube in the prior art is avoided, the power tube can be completely conducted in the state, the output voltage changes along with the input voltage, the voltage difference between the output voltage and the input voltage is small, and then the system loss can be reduced; and compared with the prior art, the power tube with a smaller area can be adopted to realize the same technical index. When the output voltage is in a voltage stabilization state, the second control signal generation circuit generates a low-level second control signal based on the error amplification signal to control the second transistor to be turned off, namely, in the state, the buffer output control circuit does not affect the work of the power tube.

The embodiment of the invention provides a noise shaping circuit and an analog-to-digital converter, which can be applied to the technical field of integrated circuits. The noise shaping circuit comprises a plurality of switches, a first capacitor, a second capacitor and a buffer connected between the first capacitor and the second capacitor, the plurality of switches are configured to respond to a switch control signal and alternatively enable one of the first capacitor and the second capacitor to serve as an integrating capacitor to be connected to the analog signal input end, so that the integrating capacitor provides an integrating voltage for the buffer based on a margin voltage provided by the analog signal input end and a capacitor voltage stored in the integrating capacitor; the other one of the first capacitor and the second capacitor is used as a storage capacitor, and the integral voltage flowing through the buffer is received and stored; the integrating capacitor is configured to output an integrating voltage to the output end of the noise shaping circuit, so that the digital logic circuit performs analog-to-digital conversion on the integrating voltage to obtain a margin voltage and provide the margin voltage to the analog signal input end.

The invention relates to a load capacitance optimization method and system based on dichotomy and dynamic variable control. When load capacitance reduction processing is carried out on each load capacitance violation signal line, the method comprises the following steps: extracting load capacitance basic characteristics of the load capacitance violation signal line, and determining load capacitance formation characteristics of the load capacitance violation signal line based on the extracted load capacitance basic characteristics, and selecting a buffer insertion state corresponding to a load capacitance forming characteristic based on the load capacitance forming characteristic of the current load capacitance violation signal line, and performing buffer insertion processing on the current load capacitance violation signal line based on the selected buffer insertion state. According to the method, the forming state of the heavy-load capacitor can be accurately positioned, the buffer is inserted and arranged according to the forming state of the heavy-load capacitor, and the risks of time sequence violation, wiring congestion and power consumption exceeding are avoided while the load capacitance is reduced.

The invention discloses an LDO (Low Dropout Regulator) with a load transient response enhancement circuit and electronic equipment, and belongs to the technical field of integrated circuits. The circuit comprises an error amplifier, a buffer, a power tube, a feedback circuit, a compensation circuit and an LTRE module. The output end EAO of the error amplifier is connected with the grid electrode of the power tube through the buffer, the error amplifier compares reference voltage with feedback voltage, an EAO signal adjusts the conduction degree of the power tube, and the output voltage of the LDO is kept stable; the compensation circuit comprises an NMOS tube and a capacitor. The grid of the NMOS tube is connected with the input end of the buffer, the drain is connected with one end of the capacitor, and the source is grounded; the other end of the capacitor is connected with the EAO; one end of a delay circuit in the LTRE module is connected with the input end of the buffer, and the other end of the delay circuit is connected with the grid electrode of the NMOS tube, so that the grid electrode voltage is delayed to rise when the buffer voltage rises. The circuit has the advantages of low working voltage, low voltage drop and low static power consumption, and the transient response can be enhanced when the load current is increased or decreased.

The invention belongs to the field of integrated circuits, and provides an input buffer with a quiescent operating point not affected by the outside, which comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a first operational amplifier, a second operational amplifier and a third operational amplifier, the output ends of the first operational amplifier and the second operational amplifier are respectively connected with the non-inverting input end and the inverting input end of the second operational amplifier; and the positive phase input ends of the first operational amplifier and the second operational amplifier are clamped at a preset voltage value. Through the connection mode of the first operational amplifier, the second operational amplifier and the third operational amplifier, the voltage difference of the input end of the third operational amplifier is clamped on the preset voltage value, the external input influence is isolated, and the stability of a quiescent working point is ensured.

The application discloses a kind of electrical equipment performance comprehensive test device, including comprehensive test box and walking base, the top of the walking base is fixedly connected with support, the top of the support is rotatably connected with suspension frame, and the rotating axis of the suspension frame and comprehensive test box is horizontal.The application is provided with support, suspension frame, top protection trigger frame and side protection trigger frame, wherein the comprehensive test box is hung at the free end of the suspension frame, the top of the support is rotatably connected with the suspension frame, the side protection trigger frame is arranged on the two sides of the comprehensive test box, and the top protection trigger frame is arranged on the top, then the clutch control group and the winding buffer are arranged on the support, when the left and right sides or the top of the comprehensive test box is impacted, the suspension frame will swing down to drive the comprehensive test box to buffer subsidence, away from the impact area, the setting has impact displacement self-protection function, which greatly improves the self-protection performance of the comprehensive test box.

A signal transmission circuitry is a circuitry that transmits a signal from a first system on a transmission side to a second system on a reception side. The first system includes an inductor, a first current source controlled by a first switch, a second current source connected in series with the first current source via the inductor and controlled by a second switch, a third switch connected in parallel with the first current source and controlling connection with a ground point, and a fourth switch connected in parallel with the second current source and controlling connection with the ground point.

In certain aspects, a voltage buffer includes a first source follower having an input and an output, and a second source follower having an input and an output. The voltage buffer also includes a first transistor, wherein a drain of the first transistor is coupled to the output of the first source follower, and a first coupling capacitor coupled between a gate of the first transistor and the input of the second source follower. The voltage buffer also includes a second transistor, wherein a drain of the second transistor is coupled to the output of the second source follower, and a second coupling capacitor coupled between a gate of the second transistor and the input of the first source follower. The voltage buffer further includes a current source coupled to a source of the first transistor and a source of the second transistor.

According to one embodiment, an oscillation circuit includes: a ring oscillator; a first transistor having a gate terminal coupled to an output port of the ring oscillator and a drain terminal coupled to a first node; a second transistor having a drain terminal and a gate terminal that are both coupled to the first node; a third transistor having a gate terminal coupled to the first node and a drain terminal coupled to a second node; a fourth transistor having a gate terminal coupled to the first node and a drain terminal coupled to a third node; a fifth transistor having a drain terminal coupled to the second node and a source terminal coupled to the third node; and a voltage buffer having an input port coupled to the second node.

The utility model discloses a clutch detection tool comprising an installation clamp used for fixing a clutch to be detected, an overturning mechanism which is connected with the installation clamp and can drive the installation clamp to rotate, a driving mechanism, and a limiting mechanism which ensures that the center position of the clutch to be detected does not deviate after overturning. In a standby state, the mounting clamp is kept horizontal; the positioning mechanism is selected according to the model of the clutch to be tested, the clutch is fixed on the mounting fixture and vertically inserted into the mounting fixture, the clamping cylinder performs automatic clamping, quick positioning is facilitated, and the mounting fixture and the turnover mechanism are integrated together, so that the mounting time is shortened; the first limiting block in the limiting part can prevent the overturning mechanism from overturning excessively, and when the overturning mechanism collides with the first limiting block, the first buffer can reduce impact force and cooperate with the concentric bearing on the support, so that the clutch to be detected is prevented from deviating to the maximum extent, follow-up butt joint with the load shaft is ensured, the adjustment time is shortened, and the detection precision is ensured.

The invention belongs to the technical field of hoisting equipment, and particularly relates to an intelligent hoisting structure of mechanical electrical automation equipment, which comprises a chassis frame, a rotation driving mechanism, a translation assembly and a sling assembly, the chassis frame is connected with an arranged lower stand column through the rotation driving mechanism, the translation assembly is arranged between the lower stand column and an upper stand column, and the sling assembly is connected with the chassis frame through the rotation driving mechanism. A lifting adjusting mechanism matched with the lifting appliance assembly is arranged on the upper side of the upper stand column. According to the invention, a passive gravity center self-adaptive mechanism in which an inclined slide rail is matched with an inclined slide block is designed in the lifting appliance assembly. After the lifting appliance is connected with lifted equipment, the inclined sliding block automatically slides to the gravity center position of the system under the driving of a gravity component, so that a lifting point is accurately overlapped with the gravity center, and sliding impact is absorbed by the hydraulic buffer. The structure does not need complex transmission parts such as a motor lead screw and closed-loop control, and has the remarkable advantages of being simple in structure, high in reliability and low in maintenance cost.