725 results about "Auxiliary circuit" patented technology

The invention belongs to the field of driving circuits of gallium nitride (GaN) power devices in motor driving or power electronic conversion, and discloses a design method of a three-level active driving circuit for restraining bridge arm crosstalk of a GaN device, and the method comprises the steps that a circuit is connected in a bridge type topological structure, and the bridge type topological structure comprises an upper bridge arm and a lower bridge arm which are the same in structure; the upper bridge arm and the lower bridge arm are both divided into two parts, namely a traditional driving circuit and an auxiliary circuit, and the auxiliary circuit is divided into a negative voltage self-recovery circuit and a crosstalk suppression circuit. According to the invention, a negative voltage self-recovery circuit and a crosstalk suppression circuit are formed by using the output and reverse conduction characteristics of the charge pump and the auxiliary GaN device. The advantages of the two methods are combined, the defects of a traditional method are effectively overcome, the turn-off speed is increased, the turn-off loss is reduced, and the positive and negative crosstalk is reduced while the turn-on speed is hardly influenced and the reverse turn-on loss is not additionally increased. The overall design is flexible, efficient and reliable.

The invention discloses a manufacturing method of a high-precision bearing type rigid-flexible combined circuit board, a forming line is designed in a processing process board, the manufacturing method comprises the following steps: manufacturing a flexible board comprising a flexible area and a rigid combined area, taking a rigid copper-clad plate, and manufacturing a circuit pattern, the circuit pattern comprises an auxiliary circuit pattern corresponding to a bonding pad pattern of the flexible board, a first groove body is manufactured on the outline of the flexible area, a first connecting position is arranged between the first groove body and the auxiliary area, a second groove body is manufactured on the outline of the rigid combination area, a second connecting position is arranged between the second groove body and the auxiliary area, a rigid bearing plate is formed, the flexible plate and the rigid bearing plate are pressed and formed, and the high-precision bearing type rigid-flexible combined circuit board is formed. The flexible plate and the rigid bearing plate are manufactured independently, the rigid bearing plate is manufactured according to the forming line to form the groove body, then overall pressing is conducted, the flexible plate is formed through laser cutting, the problems of pulling, tearing and the like of the flexible plate caused by milling forming of the overall plate body are effectively solved, and the machining quality and reliability are improved.

The present invention relates to a functional unit of a low-voltage complete set of equipment guided and positioned through a sliding groove, including a unit chamber and a unit assembly within the unit chamber. There is a guide rail device on each of the left and right sides of the unit assembly. The guide rail device includes a sliding groove and at least two sliding members arranged front and rear and embedded in the sliding groove. The sliding members and the sliding groove are respectively located at the bottom of the unit assembly and on the unit chamber floor plate of the unit chamber. The sliding groove includes a forward movement stroke segment and a rear connection stroke segment distributed front and rear. The rear connection stroke segment is used to cooperate with the rear sliding member to guide the unit assembly in the connection stroke. The fitting clearance between the forward movement stroke segment and the sliding member > the fitting clearance between the rear connection stroke segment and the sliding member. The beneficial effects are as follows: The sliding groove type guide rail device can effectively ensure the correct alignment and insertion of the main and auxiliary circuit connectors during the displacement operation of the functional unit, and ensure more reliable main circuit connection performance; at the same time, the structure is simple, with few parts and low cost.

A switched capacitor converter includes an auxiliary circuit, a first branch and a second branch, the auxiliary circuit is connected between the first branch and the second branch, all power transistors of the first branch and the second branch are primary power transistors, and the auxiliary circuit transfers a charge or electric charges on one of the first branch and the second branch to another of the first branch and the second branch during a dead time when the primary power transistors are turned off, so as to the primary power transistors turn on at zero voltage and reduce a switching loss.

According to the contact mechanism, the contact system and the DC contactor of the utility model, the auxiliary moving contact module moves with the moving part transmission member and the moving contact bridge on the transmission member in an interlocking manner, the dimension chain is short, and the movement stroke is stable and reliable; as the reed is in interlocking fit with the transmission piece and the movable contact bridge through the base, the transmission piece can push the base to enable the movable contact bridge and the reed to synchronously perform disconnection motion, and inevitable disconnection can be ensured through larger main spring counterforce even if the reed is adhered to the auxiliary static contact, so that the on-off states of the main contact and the auxiliary loop are ensured to be consistent.

The utility model discloses a grounding detection device for an auxiliary circuit of a railway locomotive. The grounding detection device comprises a plurality of loads, an A / D converter, a judging device and a plurality of current detectors, the input end of each current detector is connected with the shell of the corresponding load and is used for acquiring the grounding current leaked from the shell of the load; the input end of the A / D converter is connected with the output end of the current detector, and the A / D converter is used for converting the grounding current into a digital signal from an electric signal; the judger is connected with the output end of the A / D converter and comprises comparators in one-to-one correspondence with the A / D converter, each comparator is internally provided with a threshold value, the comparators are all compared with the corresponding digital signals, when the input digital signals are not larger than the threshold values, the comparators output first signals, and when the input digital signals are larger than the threshold values, the comparators output second signals. And the comparator outputs a second signal so as to simplify the process of ground fault detection and improve the easiness of load detection.

The invention relates to a power conversion module, a control method and a power conversion system, a bridging branch is arranged between a first power unit and a second power unit, the bridging branch comprises a resonant capacitor and a switch unit which are electrically connected, the resonant inductor is connected between the midpoints of the first bridge arm and the second bridge arm or is connected in series with the resonant capacitor. By controlling the on-off of the bridging branch, the current opposite to the power grid is generated on the branch connecting the first bridge arm and the second bridge arm, so that the soft switching of the switching tube of the power conversion module is realized with a small number of auxiliary circuits, and the working efficiency of the system is favorably improved.

The invention discloses a magnetic bearing rotor state monitoring device based on a flexible detection lantern ring. The rotor motion state monitoring device is composed of a magnetic suspension bearing system, the flexible detection lantern ring, an emitting electrode iron core, an emitting coil, a support, frequency sweeping equipment and the like. A rotor of the magnetic suspension bearing system is sleeved with a flexible detection lantern ring, a PI flexible material is used as a base layer of the flexible detection lantern ring, a temperature sensor, an acceleration sensor and a strain sensor are arranged in the flexible detection lantern ring to collect data so as to measure data of strain, torsion, amplitude and temperature of the rotor, and the flexible detection lantern ring is charged by adopting a wireless charging technology. And finally, sensor signals are transmitted at different frequencies through an oscillating circuit and an antenna accessory circuit in the sensor matching circuit, and are transmitted to frequency sweeping equipment for frequency sweeping receiving processing. The device solves the problem that related important data of a rotor mode cannot be directly measured in real time, so that a control strategy is changed immediately when the rotor reaches a critical rotating speed, and stable operation of a magnetic bearing system is maintained.

The invention relates to the technical field of electrochemical energy storage, and discloses an energy storage battery charging and discharging safety protection system which comprises an auxiliary loop used for cooling a battery module in a battery pack, a refrigerant flowing through the auxiliary loop and a control module used for controlling starting of the auxiliary loop. The auxiliary loop comprises a composite direct cooling plate which is positioned above a battery module in the battery pack and is used for dissipating heat and cooling the battery module; the composite direct cooling plate comprises at least two layers of direct cooling plates which are attached to each other; the control module is further used for controlling a refrigerant to flow through the direct cooling plate of the corresponding layer according to different heat dissipation requirements of the upper part of the battery cell, and the refrigerant flows through the composite direct cooling plate through the auxiliary loop to dissipate heat and cool the battery module. The invention can ensure uniform temperature distribution in the battery cell, ensure the charging and discharging efficiency, prolong the service life and prevent thermal runaway.

The invention discloses a welding machine chopper circuit control method and device based on multistage power regulation, and relates to the related field of chopper control, and the method comprises the steps: determining a circuit topology structure which comprises a main circuit topology and an auxiliary circuit topology based on chopper control; the dual-drive control module is supervised and trained based on hybrid modulation of the duty ratio and the switching frequency; receiving a welding task and determining a frequency modulation sequence; dividing multi-stage power features and mining a Markov frequency modulation chain; the combined digital signal processor and the programmable controller construct a control loop; and receiving a frequency modulation sequence and a precursor control signal, executing a chopping frequency modulation control decision and signal conversion based on a control loop, and performing chopping circuit control response. The technical problem that the welding process is unstable due to the fact that the control precision of an existing chopper circuit of the welding machine is insufficient is solved, and the technical effect of improving the control precision and stability of the welding process is achieved.

Disclosed is a quantum circuit for implementing multi-controlled NOT gates with N control qubits. A quantum circuit for implementing multi-controlled NOT gates with N control qubits according to one embodiment of the present disclosure may include a first auxiliary circuit that corresponds to one or more initial layers of a plurality of layers and performs a controlled NOT operation on a target qubit based on an Nth control qubit from among the N control qubits and a first auxiliary qubit initialized to a |+> state, a quantum gate group that corresponds to the plurality of layers and performs controlled NOT operation on the first auxiliary qubit based on first to (N−1)th control qubits, and a second auxiliary circuit that corresponds one or more last layers of the plurality of layers and performs controlled NOT operation on the target qubit based on the Nth control qubit and the first auxiliary qubit.

The embodiment of the invention provides an optical detection circuit, a wireless communication base station, a system and a signal processing method, relates to the technical field of wireless communication, and is used for improving the rollback efficiency of the optical detection circuit. The optical detection circuit comprises a main circuit and an auxiliary circuit, the main circuit is conducted, the auxiliary circuit is conducted under the control of the power amplifier when the power is larger than a set value, the turn-on voltage effect similar to that of a triode can be achieved, and the output power of the optical detection circuit is improved. An impedance modulation network is adopted to carry out output load modulation on the optical detector in the main path and the optical detector in the auxiliary path, so that dynamic load conversion from a backoff point to a maximum output point is realized, and the main path optical detector and the auxiliary path optical detector can maintain relatively high output efficiency in an interval between the maximum power point and the backoff point; therefore, the purpose of improving the backspacing efficiency of the optical detection circuit is achieved.

The invention discloses a method for realizing capacitor voltage balance of a four-level energy storage converter under a low modulation ratio condition, and the method comprises the steps: converting a space vector diagram of the four-level energy storage converter under an alpha-beta coordinate system into a g-h coordinate system at a low modulation ratio, and obtaining three nearest vectors for synthesizing a reference voltage vector Vref and duty ratios of the three nearest vectors; therefore, the sector judgment process is simplified, and the calculation process of the duty ratio acted by the basic voltage vector is reduced. Then, according to the small triangle where the reference voltage vector Vref is located and the duty ratio of the action of the three vectors for synthesizing the reference voltage vector Vref, a five-segment type modulation synthesis mode and a seven-segment type modulation synthesis mode are adopted, and a switch sequence corresponding to each small sector is obtained; and finally, the switching sequence corresponding to the small sector is evaluated through the target function, and the switching sequence when the target function is the minimum value is selected as the optimal switching sequence by using comparison operation. And capacitor voltage balance of the four-level energy storage converter is realized. The technical problem that an existing additional auxiliary circuit balancing method is poor in practicability can be solved.

The invention discloses a domestic high-power IGBT rectification system and method, and relates to the technical field of IGBT rectification, and the method comprises the steps: constructing an active front-end rectification main circuit; a direct current side hybrid harmonic modulation auxiliary circuit is integrated; performing multiple delay signal elimination operation on the sampled signal, filtering out a harmonic interference signal, and locking the frequency and phase of the fundamental voltage of the power grid through a phase-locked loop; establishing a control structure of a voltage outer loop and a current inner loop, generating an instruction amplitude of a grid-side active current and an ideal sinusoidal current reference waveform, and controlling an IGBT in an active front-end rectification main circuit in real time; real-time fast Fourier transform analysis is carried out on the actual input current of the grid side, and residual harmonic components are identified; and feedback management of regenerated energy is realized. The invention provides a fused high-adaptability active front-end IGBT (Insulated Gate Bipolar Translator) rectification method and system which can stably operate under the condition of power grid voltage distortion and realize deep harmonic suppression and efficient energy bidirectional flow.

The utility model relates to a control circuit of an electric toothbrush, which is low in cost, small in size and light in weight and has the functions of quick charging and current backflow prevention. The control circuit is composed of a circuit board, a battery, a motor and connecting pieces among the circuit board, the battery and the motor. The circuit board is composed of a power interface module, a battery management module, a motor driving module, a central controller and a man-machine interaction module, the battery management module and the motor driving module are both main loops formed by discrete components and necessary auxiliary circuits, and the work of the battery management module and the motor driving module is controlled by the central controller. And the battery management module is an STEP-DOWN type switching power supply circuit provided with a battery voltage feedback circuit and a charging current feedback circuit. The STEP-DOWN type switching power supply circuit is composed of an input energy storage capacitor, a main transistor, a driving circuit of the main transistor, a fly-wheel diode, an inductor and an output energy storage capacitor. And the control electrode of the main transistor is directly connected to the central controller or is connected to the central controller through a charging driving circuit.

The invention provides a quick oil return method of a heat pump system, which comprises the following steps of: before a compressor is started, judging whether refrigerant deposition exists or not according to environment temperature and shutdown duration; if refrigerant deposition exists, an auxiliary electronic expansion valve control program is started, and if refrigerant deposition does not exist, a heat pump is started according to a normal program; an auxiliary road electronic expansion valve control program is started, the exhaust superheat degree is judged and compared with a monitoring reference threshold value, and whether control is conducted according to the exhaust superheat degree or the injection superheat degree or not is determined; meanwhile, the exhaust superheat degree is compared with a plurality of pressure threshold values, the injection superheat degree is compared with a plurality of temperature threshold values, and the opening degree of an auxiliary road electronic expansion valve is determined; and determining that the temperature, pressure and exhaust superheat degree of the compressor are within normal ranges, determining that the flow rate of the refrigerant is stable, unlocking a control program of an auxiliary electronic expansion valve, quitting a quick oil return mode, and recovering to an automatic control mode of the heat pump. Reliable operation of the compressor is ensured, and the product reliability is greatly improved.

A bidirectional crosstalk suppression driving circuit suitable for a wide bandgap power semiconductor device comprises a push-pull circuit and a crosstalk suppression auxiliary circuit, the push-pull circuit is connected with the crosstalk suppression auxiliary circuit, and the crosstalk suppression auxiliary circuit is connected with a grid electrode and a source electrode of the power semiconductor device. The push-pull circuit is used for generating a driving voltage signal to drive a power semiconductor device. When the power semiconductor device is subjected to positive crosstalk, positive voltage is generated through a negative voltage capacitor in the crosstalk suppression auxiliary circuit, and the influence of negative overvoltage generated on a driving resistor when the positive crosstalk occurs is reduced; when the power semiconductor device is subjected to negative crosstalk, gate equivalent driving impedance is reduced through an RD auxiliary branch in the crosstalk suppression auxiliary circuit, and reverse overvoltage caused by negative crosstalk is reduced. The circuit has compatibility and economical efficiency, and is simple in structure and easy to operate. The method is of great significance in improving the turn-on and turn-off reliability of a power semiconductor device and guaranteeing stable operation of a system.

A charging system including an on-board charger (OBC), a wake-up auxiliary circuit, and a battery management system (BMS). The on-board charger is provided with a charging input port and a charging output port. The wake-up auxiliary circuit includes a first diode having a positive electrode electrically connected to the charging output port, and a second diode having a positive electrode electrically connected to a direct current (DC) charging vehicle interface, negative electrodes of the first and second diodes are electrically connected to a same port of the BMS. The first diode is configured to transmit an alternating current (AC) charging wake-up signal emitted by an AC charging pile, which signal is configured to awaken the BMS upon AC charging. The second diode is configured to transmit a DC charging wake-up signal emitted by a DC charging pile, which signal is configured to awaken the BMS upon DC charging.

The invention provides a control method of a heat pump system, which comprises the following steps of: determining a control parameter for a main electronic expansion valve 8 based on a working parameter in combination with a current value of a compressor 1, and determining a control parameter for an auxiliary electronic expansion valve 4 based on the working parameter in combination with the current value of the compressor 1 and the opening degree of the main electronic expansion valve 8. The problems that due to the fact that the target return air superheat degree is set unreasonably, the opening degree of a main path electronic expansion valve is too large, the auxiliary path flow is small, the heating capacity is poor, or compressor exhaust high temperature protection shutdown is generated under the high pressure ratio are solved. The problems that due to the fact that the target return air superheat degree is set unreasonably, the opening degree of a main path electronic expansion valve is too small, too much refrigerants are accumulated in a condenser, the compressor exhaust pressure is too high, and shutdown is protected, or due to the fact that the auxiliary path flow is too large, the compressor works in a heavy load mode, the compressor current is too high, and shutdown is protected are solved. The fault shutdown probability and the maintenance rate of a unit are greatly reduced, and the product reliability is improved.

The utility model discloses a power supply circuit of a rail locomotive, which belongs to the field of rail locomotives and comprises a power storage battery, charging devices, a main circuit and an auxiliary circuit. The first charging device is connected with the first power storage battery, the first power storage battery supplies power to the first traction inversion module, the second traction inversion module and the first auxiliary inversion module, the second charging device is connected with the second power storage battery, and the second power storage battery supplies power to the third traction inversion module, the fourth traction inversion module and the second auxiliary inversion module. The first auxiliary inversion module is connected with the second auxiliary inversion module through an equalization contactor KM6. According to the utility model, the two auxiliary inversion modules are standby for each other, so that the redundancy is good; the balancing contactor of the auxiliary loop can solve the problem that the electric quantity of two independent systems is unbalanced; braking working condition electric energy is fed back to the power storage battery, and the energy utilization rate is high.

The invention provides a voltage regulation firmware upgrading method, a server, electronic equipment and a storage medium, and can be applied to the technical field of computer application. The method comprises the steps that under the condition that a server power supply is turned off, an auxiliary circuit related to voltage regulation firmware to be upgraded is set to be in a turn-off state in response to a detected auxiliary power-off command from a substrate management controller, so that under the condition that the substrate management controller detects that the auxiliary circuit is turned off, the auxiliary circuit related to the voltage regulation firmware to be upgraded is turned off; upgrading the to-be-upgraded voltage regulation firmware to obtain upgraded voltage regulation firmware; and in response to detection of an auxiliary power-on command from the substrate management controller, setting the auxiliary circuit to be in an on state so as to operate the upgraded voltage regulation firmware.

The utility model relates to a mounting device for an electric curtain, which comprises a mounting rail, a first connecting rod, a second connecting rod and a connecting rod, the driving device is mounted at the first end of the mounting rail; the power supply device comprises a power supply box and a detachable power supply bag, the power supply box is mounted at the second end of the mounting track, the power supply bag is detachably mounted in the power supply box, an auxiliary circuit board is mounted in the power supply box, a power supply port and a first splicing port are formed in the auxiliary circuit board, and a second splicing port connected with the first splicing port in an inserted mode is formed in the power supply bag; the power supply device and the driving device are arranged at the two ends of the mounting track respectively, the power supply device is convenient to assemble and replace, a power pack in the power supply device is of a detachable mounting structure, and people can replace the power pack conveniently. The power supply port is exposed on the power supply box of the power supply device and can be electrically connected with an external power supply, so that the selection of power supply modes is more diversified.

The invention discloses an ion pump high-voltage power supply, and belongs to the technical field of power supplies and ion pumps. The ion pump high-voltage power supply comprises a square wave generation circuit, a forward inverter circuit, a voltage doubling circuit, a power supply management circuit and a high-voltage restart auxiliary circuit. The two voltage doubling circuits for generating positive and negative high voltages share one set of converter and transformer, so that the efficiency is improved, and the installation size is reduced; the output current of the high-voltage power supply is monitored in real time, the high voltage is closed when the current is lower than a set threshold value, and the high voltage is restarted after a period of time, so that the operation efficiency is further improved; compared with a scheme of increasing the capacity of a storage battery, the high-voltage power supply has the advantages that the cost of the system can be greatly reduced, experimental results show that the high-voltage power supply can continuously run for more than 30 days under the condition that only one 9V dry battery is used, and compared with the prior art, the endurance time of the high-voltage power supply is remarkably prolonged.

The invention discloses a self-commutation current converter, a control method and a control device thereof, and a high-voltage direct-current transmission system, the self-commutation current converter comprises a main circuit and an auxiliary circuit, the main circuit comprises a bridge arm circuit connected between an anode bus and a cathode bus, and the auxiliary circuit comprises an isolation circuit, a full-bridge circuit and a transfer circuit. According to the self-commutation current converter, under the condition that commutation of a bridge arm circuit of a main circuit is about to fail, a full-bridge circuit is controlled to provide commutation voltage, so that a transfer circuit and an isolation circuit are conducted to transfer current of the bridge arm circuit to an auxiliary circuit; and when the bridge arm circuit is recovered to be turned off, the full-bridge circuit is turned off to generate commutation voltage to transfer the current to another phase, so that self-commutation independent of alternating voltage is realized. The method does not need to depend on a power grid, has the self-commutation capability, can inhibit the commutation failure, and improves the reliability of high-voltage DC power transmission.

The utility model relates to a winding stretching type vehicle-mounted charger, which comprises a vehicle charger shell, a main circuit board and a winding assembly, wherein the main circuit board and the winding assembly are arranged in the vehicle charger shell. A winding cavity and a vehicle charging cavity are formed in the upper portion of the shell, the main circuit board is installed in the winding cavity, an auxiliary circuit board is arranged in the vehicle charging cavity, the winding assembly comprises a winding shaft, a volute spiral spring, a stretching line and an electric connection assembly, and the winding shaft is arranged in a top inner cavity in the direction perpendicular to the height direction of the vehicle charging shell. The wire spool is provided with a first spool surface and a second spool surface which are opposite to each other, the first spool surface is provided with the electric connection assembly, the volute spiral spring is mounted on the winding shaft, a charging wire is correspondingly and electrically connected with the main circuit board through the electric connection assembly, the electric connection wire is in reliable contact, and the main circuit board is mounted in the winding cavity and is tightly connected with the winding assembly. The overall structure is compact, space is saved, and disassembly and assembly are convenient. In addition, the circuit wiring structure in the whole structure is well-organized, the use safety and reliability are improved, and the service life of the product is prolonged.

The invention discloses a bypass inductor echelon current limiting topology and method for solid-state power distribution equipment, relates to the technical field of power electronic distribution, and is suitable for solid-state power controllers in the fields of aerospace, new energy automobiles and industrial automation. In order to solve the problems that when a large capacitive load is started, a current peak is likely to be generated to damage a device, and an existing current limiting scheme is low in efficiency or large in size, the topology comprises an input circuit, a main power circuit, an auxiliary circuit, a current limiting circuit, an absorption circuit and a load side circuit. According to the method, the auxiliary circuit switch tube is turned on in an echelon mode, and the main switch tube is turned on to complete starting after load voltage approaches power supply voltage and reaches a non-voltage-difference condition. According to the planar inductor integrated PCB, the size is reduced, the problem of long-term heating of a resistor is solved, the TVS overvoltage protection and RC anti-interference design are matched, the current peak is effectively restrained, the system efficiency and reliability are improved, and the high-power-density and differential-pressure-free starting requirements are met.

The invention relates to a LINK-JOINT asymmetric large delay matching unit based on a Schmitt trigger and application of the LINK-JOINT asymmetric large delay matching unit. The large delay matching unit comprises an input stage circuit used for realizing inversion and preliminary transmission of signals; an intermediate stage circuit for amplifying the signal and introducing a delay; the inverted proportional tube circuit is used for further increasing the delay time of the signal and realizing voltage following and amplification; the output stage circuit is used for outputting the processed signal; the auxiliary circuit provides a feedback mechanism, the input stage circuit, the intermediate stage circuit, the inverted proportional tube circuit and the output stage circuit are respectively provided with a pair of complementary PMOS (P-channel Metal Oxide Semiconductor) tubes and NMOS (N-channel Metal Oxide Semiconductor) tubes, the auxiliary circuit is provided with two NMOS tubes of which the sources are connected to the same line, an input signal I is connected with the input stage circuit, and an output signal O is connected with the output stage circuit. The large delay matching unit can be applied to an asynchronous self-clock control system of a Bluetooth chip, and the large delay matching unit can be used between nodes of a data path in a delay matching circuit module.

The utility model relates to the technical field of fuses, in particular to an active double-breaking fuse. The utility model discloses an active double-breaking fuse, which comprises a two-terminal electrode, a main loop, an auxiliary loop, a first controlled breaking mechanism and a second controlled breaking mechanism, the main loop and the auxiliary loop are arranged in parallel between the two-terminal electrode, a first melt is arranged in the main loop, a second melt is arranged in the auxiliary loop, and the second controlled breaking mechanism is arranged in the auxiliary loop. And the first controlled on-off mechanism and the second controlled on-off mechanism are used for receiving the excitation signal to act so as to respectively cut off the main loop and the auxiliary loop. According to the utility model, cut-off protection from low current to high current can be realized, the protection range is wide, the breaking speed is fast, the protection efficiency is high, and the reliability is high.

The application discloses a kind of low conduction resistance flatness analog switch structure of circuit design technical field, including CMOS transmission gate circuit and gate voltage adjusting circuit, CMOS transmission gate circuit includes transmission gate and auxiliary circuit, transmission gate and auxiliary circuit are electrically connected, CMOS transmission gate circuit is used for the signal transmission of main path;Gate voltage adjusting circuit is connected between the gate of PMOS pipe of CMOS transmission gate circuit and the gate of NMOS pipe.The whole input voltage range is handled by gate voltage adjusting circuit in the application, according to input voltage variation, output different slope gate control voltage, to reduce the conduction resistance variation of CMOS transmission gate, to reduce the purpose of conduction resistance flatness.

The invention provides a single-ended non-inductive noise-reduction push-pull LNA circuit, and the circuit comprises a first PMOS tube which is connected with a first current copy port in a grid electrode and is connected with a power input unit in a source electrode; the grid electrode of the first NMOS tube is connected with a second current copy port, the source electrode of the first NMOS tube is grounded, so that the first NMOS tube and the first PMOS tube form a push-pull amplification structure, a main circuit and an auxiliary circuit are connected between the drain electrode of the first PMOS tube and the drain electrode of the first NMOS tube, and the main circuit and the auxiliary circuit are connected through a first feedback resistor; drain current is divided into two paths and is converted into feedback voltage on the first feedback resistor; wherein two ends of the first feedback resistor are respectively connected with a radio frequency signal input end and a radio frequency signal output end, and the feedback voltage is fed back to grids of the first PMOS tube and the first NMOS tube so as to offset radio frequency noise. The circuit provided by the invention has the characteristics of low noise, small area, low power consumption, high gain and strong driving capability, and can be applied to various communication circuits.