375 results about "Voltage clamp" patented technology

The invention discloses a slew rate enhancement circuit of an operational amplifier, which comprises a comparison module used for comparing a positive input voltage and a negative input voltage of the operational amplifier and generating a first comparison signal and a second comparison signal according to a comparison result; the slew rate enhancing module is used for enhancing the slew rate of the falling edge of the output voltage of the operational amplifier according to the first comparison signal and enhancing the slew rate of the rising edge of the output voltage of the operational amplifier according to the second comparison signal; the common-mode feedback module is used for clamping the common-mode voltage of the first comparison signal and the common-mode voltage of the second comparison signal to a reference voltage when the operational amplifier is in a steady state, so that the slew rate enhancing module is in a closed state; therefore, the slew rate of the output voltage of the operational amplifier can be quickly enhanced when the operational amplifier has large step signal output, so that the output of the operational amplifier is quickly responded and established.

The utility model discloses a lightning protection circuit and a power converter, and relates to the technical field of power electronics. According to the lightning protection circuit, for the condition that a capacitor parallel branch in a bus capacitor circuit comprises a first capacitor, a second capacitor and an inductor, and the first capacitor is connected with the inductor in series and then connected with the second capacitor in parallel, a lightning protection device is arranged to be connected with the inductor in parallel; in the lightning stroke process, the voltage at the two ends of the inductor exceeds the action voltage of the lightning protection device, so that the lightning protection device is broken down, and the voltage at the two ends of the inductor is clamped at the voltage drop after the lightning protection device is broken down, so that overlarge voltage cannot be formed on the second capacitor; therefore, the problem of voltage oscillation caused by current backflow at the lightning stroke moment can be weakened, the voltage stress borne by a corresponding power device in a post-stage circuit is reduced, and the corresponding power device is effectively protected.

The invention discloses a negative voltage clamping circuit and method. The negative voltage clamping circuit comprises a current mirroring module which is used for providing a reference current Iref and generating a corresponding reference current according to a preset current proportion mirroring; the voltage detection module is connected with the current mirror module and the negative voltage input end of the chip and is used for detecting the voltage VS of the negative voltage input end; and the clamping control module is connected with the current mirroring module and the voltage detection module, and the clamping control module is configured to be switched on when the voltage VS of the negative voltage input end exceeds a preset clamping threshold value and clamp the voltage VS of the negative voltage input end within a preset range. According to the negative voltage clamping circuit, the change of the negative voltage input end can be monitored in real time, it is ensured that the clamping control module responds rapidly when the voltage exceeds a threshold value, the negative voltage is limited within a safe range, circuit damage or performance reduction caused by too low voltage is avoided, and therefore the stability and reliability of a chip are improved.

In one example, a circuit includes a first transistor having a first terminal coupled to a first supply voltage source, a second transistor coupled between a second terminal of the first transistor and a ground terminal, and a voltage clamp circuit coupled between the first supply voltage source and the ground terminal. The circuit may further include a first switch coupled between a control terminal of the first transistor and a second supply voltage source, the first switch having a control terminal coupled to the second terminal of the first transistor, a second switch coupled between a control terminal of the second transistor and the second supply voltage source, the second switch having a control terminal coupled to the ground terminal, and a filter coupled between the control terminal of the second transistor and the ground terminal.

The utility model provides a protection circuit and a vehicle power utilization system, and relates to the technical field of electronic circuits. The protection circuit comprises a voltage clamping unit, a voltage comparison unit and a first switch unit, wherein one end of the voltage clamping unit is connected with a power supply input end, the other end of the voltage clamping unit is connected with a first input end of the voltage comparison unit, and the voltage clamping unit is used for clamping the voltage of the power supply input end to a first voltage and outputting the first voltage to the voltage comparison unit; the second input end of the voltage comparison unit is connected with a preset voltage reference point, the output end of the voltage comparison unit is connected with the control end of the first switch unit, and the voltage comparison unit is used for turning off the first switch unit when the first voltage is larger than the voltage input by the preset voltage reference point; the first end of the first switch unit is connected with the power input end, and the second end of the first switch unit is connected with the voltage output end. Therefore, when a load throwing event occurs, high voltage is clamped, overvoltage protection is realized, and damage to electric equipment is avoided.

The invention discloses a dual-channel voltage clamping circuit, a chip and electronic equipment, and the dual-channel voltage clamping circuit comprises a first voltage clamping circuit which is connected with a to-be-clamped position and is used for clamping the voltage of the to-be-clamped position to a positive voltage clamping value when the voltage of an input signal is in a first voltage range, and a second voltage clamping circuit which is connected with the to-be-clamped position and is used for clamping the voltage of the to-be-clamped position to a negative voltage clamping value when the voltage of the input signal is in a second voltage range; the second voltage clamping circuit is connected with the to-be-clamped position and used for clamping the voltage of the to-be-clamped position to a negative voltage clamping value when the voltage of the input signal is in a second voltage range; wherein the voltage in the first voltage range is greater than the voltage in the second voltage range, and wherein the negative voltage clamp value is full amplitude adjustable. According to the dual-channel voltage clamping circuit, at least the negative voltage clamping value can be flexibly adjusted to meet different requirements, positive and negative voltage clamping is achieved through dual channels, the positive and negative voltage clamping does not affect each other, and the accuracy of the positive and negative voltage clamping is ensured.

The present invention discloses a level conversion circuit and chip for converting an input signal in a first voltage domain into an output signal in a second voltage domain. The level conversion circuit includes: a switch unit including a first MOS transistor and a second MOS transistor, wherein the control end of the first MOS transistor and the control end of the second MOS transistor are both connected to a bias voltage; an input unit operating in the first voltage domain and connected to the second end of the first MOS transistor and the second end of the second MOS transistor; a conversion unit operating in the second voltage domain and connected to the first end of the first MOS transistor and the first end of the second MOS transistor; an output unit operating in the second voltage domain; and a clamping unit connected between the switch unit and a first low voltage. In a first state, the first high voltage is not powered off and the clamping unit is disconnected. In a second state, the first high voltage is powered off and the clamping unit is turned on to clamp the driving voltage to the second low voltage. The present invention reduces chip area and avoids power consumption caused by the DC current brought by the pull-down element.

The invention provides a method and device for increasing the rated current breaking frequency of a direct-current solid-state circuit breaker and application of the method and device, and aims to solve the problem that the breaking frequency of an existing direct-current solid-state circuit breaker is limited due to over-temperature damage caused by performance degradation after multiple current impacts of a piezoresistor and difficult measurement of the junction temperature of a power device. The system comprises a junction temperature prediction module based on a physical information neural network, an auxiliary energy absorption module and a power device voltage clamping module. The junction temperature prediction module is used for accurately predicting the junction temperature of the power device in real time by fusing a physical thermal model and a neural network; the voltage clamping module suppresses turn-off overvoltage; and the auxiliary energy absorption module is started when the junction temperature is close to the limit to absorb residual energy. According to the design, turn-off energy is reasonably distributed, the impact frequency and strength of the piezoresistor are reduced, the service life of the piezoresistor is remarkably prolonged (for example, the service life is prolonged by about 10 times under the impact of 200A), then the rated breaking frequency of the solid-state circuit breaker is greatly increased, and the solid-state circuit breaker is low in cost, high in reliability and suitable for scenes such as a direct-current power grid.

The invention relates to the technical field of off-grid renewable energy hydrogen production, and discloses an off-grid alkaline hydrogen production system and a power adaptive distribution and safety control method thereof, the off-grid alkaline hydrogen production system comprises a renewable energy power supply unit, a parallel electrolytic cell module, a gas-liquid treatment system and a main controller; in the Faraday hydrogen production mode, the bubble volume is compressed by adjusting the operation pressure so as to modulate the impedance characteristic of the electrolytic cell, and the energy efficiency is improved in cooperation with current control; and in the non-Faraday polarization hot standby mode, the voltage of the rectifier cabinet is controlled to be clamped to a non-gassing polarization interval, and liquid level plugging is constructed in the U-shaped communicating pipeline according to the fluid statics principle. The system is further provided with a transient buffering strategy based on the pneumatic capacity, and pressure attenuation is delayed through the gas dead zone volume when power is suddenly reduced. The problems of hydrogen production efficiency optimization, low-power safe hot standby and mechanical protection under wide power fluctuation are effectively solved.

A method and apparatus for determining the total external voltage of a relay, and a vehicle and a storage medium. The method is applied to a BMS comprising relays (104, 105). The BMS comprises a reference source (103) and a plurality of voltage-dividing resistors, wherein the relays (104, 105) are connected to the plurality of voltage-dividing resistors (106, 107, 108, 109) in series, the reference source (103) is used for clamping a voltage of a central contact of the plurality of voltage-dividing resistors (106, 107, 108, 109) to a first voltage value, and voltage-dividing resistors located on two sides of the central contact have equal resistance values. The method comprises: determining a second voltage value of voltage-dividing resistors (106, 107), which are located on a positive electrode side of a central contact, and a third voltage value of voltage-dividing resistors (108, 109), which are located on a negative electrode side of the central contact; and determining the total external voltage value of a relay on the basis of a first voltage value, the second voltage value and the third voltage value.

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 the technical field of isolation driving chips, and provides a common-mode rejection circuit, an isolation transmission circuit and a motor driving circuit. The common-mode rejection circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a first resistor, a second resistor, a first clamping circuit and a second clamping circuit. The first clamping circuit is coupled between the power supply voltage of the receiver and a common node of the first end of the first transistor and the first end of the second transistor, and is used for clamping the voltage on the first common node; the second clamping circuit is coupled between a common node of the first end of the third transistor and the first end of the fourth transistor and the reference ground of the receiver, and is used for clamping the voltage on a second common node. According to the invention, the common-mode transient interference can be effectively suppressed in the isolation transmission circuit, and the system reliability is improved.

A short-circuit protection circuit of a half-bridge driving chip relates to the field of short-circuit protection and integrated circuit design, and comprises a pre-driving module for generating a high-side signal and a low-side signal; the half-bridge module is driven, a high-side MOS receives a high-side signal, and a low-side MOS receives a low-side signal; the gate source hardware clamping module is used for carrying out voltage clamping on the high-side MOS when over-current of the over-ground short circuit of the high-side MOS is detected; the phase voltage short-circuit protection module is used for controlling the overcurrent time when the high-side MOS short circuit is over-current, and sending a fault signal to the logic module when detecting that the high / low-side MOS short circuit is over-current; the bus over-current protection module is used for sending a fault signal to the logic module when bus over-current is detected; and the logic module judges whether the short-circuit protection circuit enters a protection state according to the fault signal. According to the invention, the response speed and the protection mechanism are intelligently switched in real time in different overcurrent fault scenes through the three-stage protection circuit, and the circuit has the characteristics of high sensitivity, fast response speed and strong anti-interference capability.

The embodiment of the invention provides an electronic data destruction system, which comprises the following steps of: covering and erasing stored data to generate a logic destruction state; the main storage power line and / or the key control chip are / is burnt out in a voltage clamping and / or current fusing mode through the self-destruction circuit. By means of logic erasing and physical destroying, data destroying is thorough and irreversible, a data reconstruction path is thoroughly blocked, and irrecoverability of data is fundamentally ensured.

The utility model discloses a level conversion circuit, a chip and a display driving device. The level conversion circuit comprises an input signal processing unit which is coupled with an enable signal and an input signal, during the effective level period of the enable signal, the input signal processing unit provides a first control signal and a second control signal which are opposite in phase, and the overturning of the first control signal and the second control signal follows the overturning of the input signal; the enabling unit is coupled with the enabling signal and provides the clamping voltage during the invalid level period of the enabling signal; the conversion unit is coupled with the first control signal and the second control signal during the effective level period of the enable signal so as to convert the input signal of the first power domain into the output signal of the second power domain; or a clamp voltage is coupled during the invalid level period of the enable signal to clamp the output signal to the clamp voltage, and the voltage value of the clamp voltage falls into the second power domain. Start-stop control of the level conversion circuit is achieved through the enabling unit, and product use scenes can be expanded.

The invention provides an image sensor, a control method thereof and electronic equipment, the image sensor comprises a pixel array and a voltage clamping circuit coupled to an output bit line of a pixel unit, the voltage clamping circuit comprises a starting control module used for providing starting voltage; the control end of the voltage transfer module receives the transfer voltage and is used for generating clamping voltage based on the transfer voltage, the first end receives the starting voltage, and the second end outputs the clamping voltage; and the control end of the output module receives the output control signal, and the output module is used for outputting the received clamping voltage to an output bit line. By improving the structure of the image sensor and designing the voltage clamping circuit corresponding to the output bit line, the transfer voltage provided by the control end can be converted into the clamping voltage to the output bit line, the structural design can be simplified, the clamping control precision can be improved, and the image sensor can be applied to the field of image sensors. In addition, different clamp voltages can be controlled in different operation stages of the image sensor, the control flexibility is improved, and the final imaging quality is provided.

In a switch system, a voltage clamping element is connected to a semiconductor switch in parallel. An active clamping circuit is connected between a control terminal and a first main terminal of the semiconductor switch. The active clamping circuit includes a first diode, a second diode, and a control switch. A second anode of the second diode is connected to a first anode of the first diode. The control switch is connected between the first anode of the first diode and the control terminal of the semiconductor switch. A second control unit controls the control switch. A breakdown voltage of the first diode is smaller than a clamp voltage of the voltage clamping element.

Provided is a power source control device for a DC / DC converter including a high-side transistor, a low-side transistor, and an inductor, the power source control device including a first error amplifier configured to receive a first reference voltage and a feedback voltage based on an output voltage of the DC / DC converter, a second error amplifier configured to receive an output of the first error amplifier and a signal indicating information regarding a current flowing through the inductor, a first comparator configured to receive an output of the second error amplifier and a ramp voltage, a switching control unit configured to perform switching control of the high-side transistor and the low-side transistor according to an output of the first comparator, and a clamp circuit configured to clamp a second amplifier output voltage outputted from the second error amplifier, to a predetermined clamp voltage.

The application provides a driving method of an inverter bridge, a driving circuit, a servo driver and a motor device. In the driving method of the inverter bridge, voltage vector output time and dead time are set, so that a power switch tube of a jth bridge arm is kept in a conduction state in two adjacent voltage vector output times before switching, the power switch tubes kept in the conduction state are changed in turn and staggeredly, in each dead time, two other power switch tubes kept in the conduction state in a previous voltage vector output time are switched off, the corresponding switching bridge arm and winding complete resonance work, the end voltage of the power switch tube to be turned on is clamped to zero potential, zero voltage conduction is realized, a soft switching mode is formed, and the switching loss is reduced and the power conversion efficiency is improved.

The invention provides a protection device of a switching power supply and a control method thereof. The protection device comprises a protection circuit and a control module, the protection circuit comprises a charging circuit, a voltage clamping circuit and a switching circuit. The charging circuit is used for charging based on input electric signals of the switching power supply; the voltage clamping circuit is used for clamping the voltage of the output end of the charging circuit to a first voltage when the driving signal of the switching power supply is at a low level; the switching circuit is used for outputting a protection signal to the control module when the voltage at the output end of the charging circuit is greater than a first preset voltage threshold; the first voltage is smaller than a first preset voltage threshold; the first preset voltage threshold value is the maximum voltage reached by the voltage of the output end of the charging circuit within the first preset time; the control module stops outputting the driving signal based on the protection signal. The protection device of the switching power supply can avoid the saturation problem of a magnetic device caused by an overlarge duty ratio, and improves the safety of a circuit.

This disclosure presents an embodiment of a power supply device for a submarine data center. One specific embodiment of the power supply device includes a pre-stage voltage regulator / conversion component, a post-stage DC-DC converter component, and a combined protection circuit. The pre-stage voltage regulator / conversion component includes several parallel single-group voltage regulator branches, each branch connected in series with a varistor and a color-coded resistor. A thin-film capacitor is connected in parallel to the output terminal of the pre-stage voltage regulator / conversion component. The post-stage DC-DC converter component, electrically connected to the pre-stage voltage regulator / conversion component, includes at least two sets of full-bridge DC synchronous rectifier circuits. The combined protection circuit includes a pre-stage combined protection circuit, a post-stage active voltage clamping circuit connected in parallel to the output side of the post-stage DC-DC converter component, and a rectifier diode bridge connected between the constant current input port and the pre-stage voltage regulator / conversion component. The pre-stage combined protection circuit is connected in series to the input side of the rectifier diode bridge. By connecting multiple voltage regulator branches in parallel and combining them with the combined protection circuit, ripple is reduced. This embodiment can improve the power supply stability of the power supply device.

The invention discloses a pulse wave signal detection-oriented transimpedance amplifier circuit with input voltage clamping and current offset functions, and relates to the technical field of integrated circuit design, the pulse wave signal detection-oriented transimpedance amplifier circuit comprises a pseudo-differential structure, a current offset module and a photosensitive diode, the pseudo-differential structure is composed of two independent operational amplifiers with double-end input and single-end output, the trans-impedance amplifier of a pseudo-differential structure composed of two independent operational amplifiers with double-end input and single-end output is used, the same voltage is connected to the same-direction input end of the trans-impedance amplifier, voltage clamping is carried out on double-end input, the differential mode precision and low-frequency stability of an input virtual site are improved, differential mode imbalance and flicker noise caused by operational amplifier mismatch are eliminated, and the stability of the trans-impedance amplifier is improved. The dynamic range of the pulse wave detection system is improved, and the pulse wave detection system has the advantages of high-precision and wide-range ambient light suppression effect, high circuit reliability, low circuit complexity, easy implementation, high loop stability, small area and low power consumption.

The invention relates to the technical field of circuit design, in particular to a cascade cross array, a data processing method and electronic equipment, the array comprises at least one first row line, at least one second row line and at least one column line, and memristive devices are arranged at cross nodes of the first row line and the second row line and the column line; the voltage input module comprises at least one output end, the output end is connected with the first row line, and the output end applies input voltage to the first row line; a trans-impedance amplifier and an analog-to-digital converter are arranged on the second row line, the trans-impedance amplifier is used for clamping the voltage of the second row line to 0V and converting the current of the second row line into voltage, and the analog-to-digital converter outputs the voltage of the trans-impedance amplifier. Therefore, the problems of high power consumption, high delay, incapability of introducing nonlinear transformation in calculation and the like when a voltage input module, an analog-to-digital converter and a trans-impedance amplifier are used for many times are solved.

The utility model provides a lightning protection filter circuit, a lightning protection filter system and electronic equipment. The lightning protection filter circuit comprises a first power line, a second power line and at least one lightning protection device, a first inductor is arranged on the first power line; the at least one lightning protection device comprises a first lightning protection device, one end of the first lightning protection device is connected with the first power line, and the other end is connected with the second power line; the first power line is provided with a first input end for inputting lightning signals, and one end of the first lightning protection device is connected between the first input end and the first inductor; according to the invention, the first lightning protection device can discharge current and clamp voltage in a protection voltage interval; however, since the first lightning protection device has a certain starting time, when a lightning signal invades from the first input end, the first inductor can generate a directional electromotive force and hinder current from passing, so that a certain lightning protection effect is achieved within the starting time of the first lightning protection device, and the lightning protection effect of the lightning protection filter circuit is improved.

The utility model discloses a passive adjustable voltage clamping circuit with a temperature protection function, which comprises an input positive end IN +, an input negative end IN-, a diode D1, a diode D2, a diode D3, a triode Q1, a field effect transistor Q2, a triode Q3, a controllable precise voltage stabilizing source N1, a temperature sensor RT1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a slide rheostat R8, the input positive end IN + and the input negative end IN-serve as input power sources, the clamping circuit works passively and can bear very high power, and the bearing power depends on the peak power of the field efficiency tube; the clamping voltage is adjustable, the voltage precision is high, the error is controlled below 1%, the field effect transistor Q2 has an over-temperature protection function, the circuit is prevented from being damaged due to thermal breakdown when external high voltage lasts for a long time, the circuit is simple, the circuit is composed of discrete components, the cost is low, implementation is easy, and the cost performance is high.

Discharge the charge that requires discharge in the inverter device. [Solution] The inverter device comprises an inverter circuit and an inverter control unit. The inverter circuit comprises a DC terminal pair consisting of a first DC terminal and a second DC terminal, an AC terminal pair consisting of a plurality of AC terminals, a first capacitor and a second capacitor connected in series between the first DC terminal and the second DC terminal, and a plurality of switch elements connected between the DC terminal pair and the AC terminal pair in a predetermined connection pattern, each being made of semiconductors and having a parasitic diode. When the inverter control unit detects an interruption in the DC power input from the DC terminal pair, it controls the plurality of switch elements to turn on and off, clamping the voltage of the first capacitor with the reverse voltage of the parasitic diode of the switched element that is turned off, and clamping the voltage of the second capacitor with the reverse voltage of the parasitic diode of the switched element that is turned off.

The application provides a low-power bandgap reference circuit, a chip and a reference voltage generation method, and solves the problems of high power consumption and the need to use an operational amplifier and a resistor in the prior art bandgap reference, and comprises the following components connected in series: a positive temperature coefficient module comprising a first transistor, a second transistor and a first MOS tube, a difference between base-emitter voltages of the first transistor and the second transistor generating a positive temperature coefficient voltage on the first MOS tube; a clamping module comprising a first clamping MOS tube and a second clamping MOS tube, the clamping module being used to provide equal first clamping voltage and second clamping voltage; a negative temperature coefficient module comprising a first MOS tube and a second MOS tube, threshold voltages of the first MOS tube and the second MOS tube serving as a negative temperature coefficient voltage; a current mirror module proportionally copying a current of a branch in which the first transistor is located to a branch in which the negative temperature coefficient module is located and a branch in which the second transistor is located, and the negative temperature coefficient voltage and the positive temperature coefficient voltage being added together to serve as a reference voltage.

The application provides a method and device for improving the rated current breaking times of a direct-current solid-state circuit breaker and application thereof, and aims at the problem that the performance of an existing direct-current solid-state circuit breaker is degraded after multiple current impacts on a voltage-dependent resistor, the junction temperature of a power device is difficult to measure, and the breaking times are limited due to over-temperature damage, the application comprises a junction temperature prediction module based on a physical information neural network, an auxiliary energy absorption module and a power device voltage clamping module. The junction temperature prediction module accurately predicts the junction temperature of the power device in real time by fusing a physical thermal model and a neural network. The voltage clamping module suppresses the turn-off overvoltage. The auxiliary energy absorption module is started when the junction temperature is close to the limit, and absorbs the remaining energy. The design reasonably allocates the turn-off energy, reduces the impact times and intensity of the voltage-dependent resistor, significantly improves the service life (such as about 10 times under the impact of 200 A), and further greatly improves the rated breaking times of the solid-state circuit breaker, and is low in cost, high in reliability, and suitable for scenes such as a direct-current power grid.

The present invention discloses a control method, device, and apparatus based on a bridge circuit with series switches. Considering that when an auxiliary switch tube of an active voltage clamping circuit is turned on and a clamping capacitor is connected to a target bridge arm, the bridge arm voltage is equal to the sum of the voltage values ​​of the connected clamping capacitors, the present application controls the connection of the clamping capacitors within a dead time before the target bridge arm is turned on. Since the clamping capacitors discharge externally after connection, the greater the voltage of the clamping capacitors, the longer the time they are controlled to be connected to the target bridge arm. First, the voltage balance of each clamping capacitor is ensured. In addition, precisely because the clamping capacitors are connected for different lengths of time, the bridge arm voltage of the target bridge arm decreases in a step-like manner and drops to zero after the dead time ends, thereby reducing electromagnetic interference, reducing the requirements and volume of subsequent filter circuits, and facilitating stable and reliable operation of the circuit.