732 results about "Filter capacitor" patented technology

The present invention relates to a magnetic resonance system and a gradient amplifier filter for a magnetic resonance system. The filter includes a plurality of non-magnetic core inductors and a printed circuit board having a multilayer structure, a plurality of filter capacitors being formed in a plurality of regions of the printed circuit board, respectively, wherein each non-magnetic core inductor is provided on the printed circuit board and spanning two of the plurality of filter capacitors.

The invention discloses an isolation type split-phase inverter circuit and a control method thereof. The isolation type split-phase inverter circuit comprises an isolation DC / DC module circuit and a power frequency rectification module circuit. The isolation DC / DC module circuit comprises an input-side full bridge, a three-end transformer and two output-side circuits, an input-side winding of the three-end transformer is connected with a midpoint of a bridge arm of the input-side full bridge, and the input-side full bridge is connected with a filter capacitor C1 in parallel; two output side windings of the three-end transformer are respectively connected with corresponding output circuits through a resonance network circuit, the two output circuits are connected to a power frequency rectification module circuit through filter capacitors C4 and C5, and the negative electrode of the first output circuit and the positive electrode of the second output circuit are connected to form an interface N; the power frequency rectification module circuit comprises a rectification full-bridge circuit, and an interface L1 and an interface L2 are obtained after rectification. Through cooperative control of direct transmission of integrated topology and voltage signals, a complex parameter matching algorithm is not needed, breakthrough in structure simplification, energy conversion efficiency, control convenience, cost control and safety is achieved, and the method is suitable for various power conversion scenes.

The utility model discloses an anti-thunder filtering electric connector, which comprises a metal shell, an input end contact element, a filtering capacitor, an output end lead, a transient suppression diode and a printed board, and is characterized in that the filtering capacitor is a plate-type capacitor which is arranged in the metal shell; the plurality of input end contacts respectively pass through a plurality of inner electrode through holes of the plate-type capacitor and a plurality of corresponding through holes on the printed board, the plurality of transient suppression diodes are respectively installed on the printed board, and one ends of the transient suppression diodes are respectively in conductive connection with the plurality of input end contacts. The other ends of the plurality of transient suppression diodes are respectively and conductively connected with the inner wall of the metal shell, and the inner ends of the plurality of input end contacts are respectively and conductively connected with the inner ends of the plurality of output end leads. The utility model has the functions of filtering, lightning protection and electric connection at the same time, the product integration level is very high, the volume and the weight are reduced, a lightning protection circuit module does not need to be added in a post-stage circuit module during application, the design and the production of the whole machine are facilitated, and the production efficiency of the whole machine is improved.

The invention relates to a converter soft start method based on mode seamless switching, which belongs to the technical field of converter soft start, and comprises the following steps: a converter adopts a network following / network construction hybrid control structure; after the converter receives a starting instruction, voltage and frequency are automatically constructed in a network construction control mode, and a filter capacitor is pre-charged; performing amplitude and phase angle pre-synchronization on the voltage of the output port of the converter and the voltage of the power grid based on a pre-synchronization strategy; and switching the converter from a network construction control mode to a network following control mode to complete soft start. According to the method, the pre-charging requirement of the alternating current capacitor is met, and soft-start smooth grid-connected operation of the converter is realized through a pre-synchronization strategy.

The single-phase bidirectional single-stage isolation matrix converter comprises a pre-stage circuit and a post-stage circuit, and the pre-stage circuit comprises an LC filter on the power grid side, a pre-stage single-phase matrix conversion circuit and an LLC resonance circuit with a high-frequency transformer; the post-stage circuit comprises a post-stage conversion circuit and an output filter capacitor; the front-stage single-phase matrix conversion circuit comprises four bidirectional switch assemblies of a full-bridge structure. Each bidirectional switch assembly comprises two unidirectional controllable MOS tubes which are reversely connected in series, one end of each bidirectional switch assembly is connected to an L line or an N line of a power grid, and the other end of each bidirectional switch assembly is connected to the LLC resonance circuit. The rear-stage conversion circuit comprises a bidirectional MOS (Metal Oxide Semiconductor) tube bridge circuit and three high-frequency transformer secondary windings which are in triangular connection or star connection; and two end points of each secondary winding are respectively connected to the upper MOS tube and the lower MOS tube of the corresponding bridge arm and then are connected to output positive and negative ends. The converter has the advantages of high power density, low current harmonic, high power factor and the like, and is small in size, strong in anti-interference capability, wide in buck-boost range, and safe and reliable in commutation.

The invention relates to the technical field of Internet of Things, in particular to a circuit for simultaneously converting UART (Universal Asynchronous Receiver / Transmitter) to multi-path different level communication, which comprises a double-USB input module, a power supply processing module, a USB-UART core conversion module and a multi-path level conversion module, the double-USB input module comprises an MINI-USB interface J6 and a USB-B interface J8, VBUS pins of the two interfaces are connected in parallel through a Schottky diode and then output to the power supply processing module, and data differential pair pins are connected in parallel and then connected to the USB-UART core conversion module; and the power supply processing module comprises an LDO (Low Dropout Regulator) voltage stabilizing chip and a filter capacitor, and is used for converting 5V voltage output by the double-USB input module into 3.3 V stable voltage. The circuit design that the UART is connected with various different levels for communication is adopted, the tool integration technology is achieved, the design that the two USB ports are connected in parallel is adopted, the compatibility of the USB data line can be effectively improved, the demands of customers are met, and the technical difficulty that one UART bus is connected with multiple USB ports is broken through.

The invention discloses a frequency quasi-independent controllable double-frequency electrically small rectification circuit, and belongs to the field of radio frequency energy collection. The rectifying circuit comprises a double-frequency matching network, a blocking capacitor, two Schottky diodes, a filter capacitor and a resistive load. The dual-frequency matching network is composed of a capacitor, an inductor and a microstrip line and used for achieving impedance matching of two working frequency points and achieving quasi-independent regulation and control of the positions of the two frequency points by adjusting the value of the inductor and the length of the microstrip line. And the microstrip line is bent for five times so as to realize the miniaturization of the overall structure of the circuit. The blocking capacitor is used for blocking a direct current component and avoiding energy feedback; the two Schottky diodes are used for converting a radio frequency signal into direct current energy; the filter capacitor is used for improving the smoothness of output direct current energy and improving the energy conversion efficiency. The device is compact in structure, adjustable in frequency point position and suitable for a dual-band radio frequency energy collection scene.

The invention relates to a single-stage AC-DC converter and a control circuit. The single-stage AC-DC converter comprises a filter, an input rectifier, a filter capacitor Cin, a first switch bridge arm, a second switch bridge arm, a capacitor Cb, an inductor Lb, a resonant cavity formed by a resonant inductor Lr and a resonant capacitor Cr, a transformer T, an output rectifier and an output capacitor Co. According to the invention, a traditional two-stage AC-DC converter and a control circuit are simplified. Compared with a single-stage AC-DC converter in the prior art, the problem that the current of a resonant cavity is too large can be solved only by adding one inductor, meanwhile, the control strategy is simple, the frequency range conversion of a switching tube is small, and soft switching of the switching tube is easy to achieve, so that high efficiency is easy to obtain, input current can be corrected to achieve a high power factor, and the power factor is high. And the output voltage ripple is small, and the method has remarkable engineering application value and market prospect.

The invention belongs to the technical field of three-phase alternating current / direct current converters, and particularly relates to a SWISS rectifier control method and system for achieving phase compensation and reducing input current harmonics, and the method comprises the steps: obtaining power grid synchronization information through sampling three-phase power grid voltage in real time and carrying out phase locking and coordinate transformation; a d-axis current reference value is generated by adopting a single PI control loop, and a q-axis compensation current is calculated in combination with feedforward compensation based on filter capacitor parameters; an input current reference value is generated through reverse Park conversion and voltage sorting, and after the direct current side inductive current is subjected to power frequency period synchronous moving average filtering, the direct current side inductive current is directly compared with the current reference value to generate a PWM driving signal. The system only needs to collect direct-current side inductance and three-phase power grid voltage, and a grid-side current sensor is not needed. According to the invention, the control structure is simplified, the power factor is improved, and input current harmonics and hardware cost are reduced.

A single-stage isolation type three-phase Cuk rectification circuit comprises a three-phase AC power supply in star connection, three bridgeless isolation type Cuk rectification circuit bridge arm modules with the same structure, an output filter capacitor Co and a load RL. The input ends of the three bridgeless isolation type Cuk rectifier circuit bridge arm modules are line voltages of a three-phase alternating current power supply, and are uab, ubc and uca respectively; the output ends of the three bridgeless isolation type Cuk rectifier circuit bridge arm modules are connected in parallel, and the parallel output ends are connected in parallel with the output filter capacitor Co; and the output filter capacitor Co is connected in parallel with the load RL. The converter has the functions of buck-boost output, power factor correction and electrical isolation, meanwhile, each Cuk rectification circuit bridge arm is of a bridgeless structure, input and output current is continuous, the power factor is high, efficiency is high, positive wide-range output voltage is achieved, the current stress of a switching device is small, and the converter has rich application scenes.

The invention provides a parameter design method for a multi-voltage rectification LCC converter, and the method comprises the steps: building a voltage precise mathematical model of a resonant cavity parallel capacitor through employing a fundamental wave equivalent method based on the condition that output capacitors of the multi-voltage rectification LCC converter and a multi-voltage rectifier participate in resonance; the gain of the voltage-multiplying LCC resonant converter is modeled through a voltage accurate mathematical model of a resonant cavity shunt capacitor; determining the number of rectifier bridges, the turn ratio of a transformer and the capacitance value of a rectification voltage-multiplying capacitor according to the voltage of the parallel capacitor of the resonant cavity and the gain of the voltage-multiplying LCC resonant converter; and determining values of the resonant cavity series-parallel capacitor and the resonant cavity inductor according to the capacitance value of the rectification voltage-multiplying capacitor. According to the method, analysis and calculation of the output filter capacitance are incorporated into parameter design of accurate modeling, a scheme for selecting the number of the voltage doubling rectifier bridges is given, and the size can be reduced and economic benefits can be increased under the condition that working condition requirements are met.

The invention discloses a low-ripple closed-loop negative-voltage charge pump circuit in the technical field of analog integrated circuits, and the circuit comprises a charge pump closed-loop modulation circuit, the output end of the charge pump closed-loop modulation circuit is connected with the low-ripple negative-voltage charge pump circuit, and the low-ripple negative-voltage charge pump circuit is used for receiving positive power supply voltage input and outputting negative power supply voltage; the low-ripple negative-voltage charge pump circuit comprises a charge pump module, the first end of the charge pump module is connected with the first end of the positive power supply filter capacitor and the output end of the charge pump closed-loop modulation circuit, and the charge pump module outputs an output signal through the first end. By fixing the switching frequency of the low-ripple closed-loop negative-voltage charge pump circuit, the influence of switching noise on the system is reduced without repeatedly starting and stopping or changing the switching frequency of the charge pump, meanwhile, the size of a positive power supply is adjusted in a closed-loop mode through a negative feedback loop, and the voltage of the positive power supply of the charge pump is dynamically compensated. And the output voltage excursion of the traditional charge pump under large current is reduced.

Disclosed in the present invention is a five-level bidirectional inverter, comprising a controller and a bidirectional inverter circuit. The bidirectional inverter circuit comprises a direct current (DC), an alternating current (AC) filter capacitor Cf, an AC, a high-frequency vertical bridge arm, a power-frequency vertical bridge arm, a high-frequency horizontal bridge arm, and two DC filter capacitors. The high-frequency vertical bridge arm and the power-frequency vertical bridge arm are both formed by connecting two power switching transistors in series; the high-frequency horizontal bridge arm is formed by connecting two power switching transistors back-to-back in series; two ends of the high-frequency vertical bridge arm and two ends of the power-frequency vertical bridge arm are respectively connected to positive and negative electrodes of the DC; and the controller controls the bidirectional inverter circuit to work in an off-grid inverter mode, a grid-connected inverter mode or a rectification mode. In the present invention, the output voltage is at five levels, and the output equivalent frequency is four times the switching frequency, thereby improving the conversion efficiency of the inverter, reducing the output voltage or current harmonics, and reducing the volume of filter inductors; and the modulation method in the present invention is simple, so that the design of the controller can be simplified.

The invention discloses a transient response enhancement method and circuit applied to a DC-DC converter, and belongs to the technical field of integrated circuits and power supplies. The method comprises the steps that the current of a filter capacitor is detected through a parallel RC detection circuit, a voltage signal VCCS is generated, peak value and valley value sampling is carried out, and whether a load jumps or not is judged; if load jump occurs, an extra discharge path is opened to extract current IM while the high / low-side power tube is controlled to charge and discharge, and charge and discharge time is adjusted to realize charge balance; and judging a steady state and resetting according to a VCCS sampling difference value of adjacent periods. The circuit comprises a load jump detection module and a transient response control module. According to the invention, the detection delay is shortened, the overshoot / undershoot voltage and the recovery time are reduced, no extra off-chip device is needed, and the transient response performance of the DC-DC converter is improved.

The invention discloses a box-type substation measurement and control system and method with a filter capacitor, and relates to the field of power monitoring. The objective of the invention is to solve the problems of poor filtering adaptability, single state monitoring dimension, high protection logic misjudgment rate, low service life prediction precision and low remote operation and maintenance efficiency in the prior art. The system comprises a self-adaptive filtering module, a multi-dimensional measurement and control module, an intelligent central control module, a hierarchical protection module, a dual-mode communication module and a local interaction module. According to the method, through multi-dimensional parameter acquisition, dynamic harmonic impedance matching and switching instruction generation, multi-sensor double-layer fusion diagnosis, multi-physics field aging prediction, three-level protection execution, data uploading and local interaction, organic fusion of dynamic harmonic treatment, multi-dimensional state perception, edge intelligent diagnosis and mechanism driving prediction is realized. The method is high in filtering adaptive capacity, comprehensive in monitoring, reliable in protection and efficient in operation and maintenance, the fault positioning precision reaches the branch level, conversion from passive response to active adaptation and early intervention can be achieved, and the method is suitable for a modern power distribution net box type transformer substation containing a distributed power supply.

The invention relates to the field of direct-current energy taking, in particular to a steel rail potential direct-current energy taking device and method applied to subway sensor power supply. In order to solve the problems of sensor power supply in a subway direct-current power supply system, for example, cable laying is difficult, battery maintenance cost is high, and environment energy collection is limited, the device utilizes steel rail potential to carry out efficient energy collection. The device comprises a main power module and a control module, wherein the main power module comprises a rectifier bridge, a double-MOSFET structure, a voltage-stabilizing filter capacitor Cbus and an energy collector; and the control module executes a maximum power point tracking strategy through the voltage measurement interface and the grid control interface. The strategy comprises a periodic open-circuit voltage acquisition stage, an optimal voltage regulation stage and a voltage holding stage, the input voltage is stabilized at 1 / 2 of the open-circuit voltage by controlling the on-off state of the double MOSFETs, and the Cbus voltage is dynamically maintained to fluctuate around the optimal reference voltage by + / -5%. Stable and efficient power supply is realized, and the maintenance cost is reduced.

The utility model discloses an aerosol forming device, the aerosol forming device comprises a microwave generation module and a microwave amplification module, the microwave amplification module comprises a power amplifier and a filter, the power amplifier is used for performing power amplification on microwave signals generated by the microwave generation module, and the filter is connected with the output end of the power amplifier. The filter comprises a plurality of filtering units used for suppressing different subharmonic signals respectively, each filtering unit comprises a filtering microstrip line and a filtering capacitor, the filtering microstrip lines in the filtering units are sequentially connected end to end to form an output end microstrip line, and the output end microstrip line is connected with the filtering capacitor. And the filter capacitor in each filter unit is connected between the output end of the filter microstrip line and the ground. According to the technical scheme, the additional efficiency of the power amplifier can be improved, and the power amplifier is smaller in size and lower in cost.

The utility model relates to a MOS tube circuit, especially a kind of wide voltage input protection circuit for the voltage lifting of MOS tube, comprising: power input end, for receiving input voltage in wide voltage range;Filtering capacitor C1 is connected with the power input end;Floating ground circuit, including voltage stabilizing diode D1 and voltage dividing resistor R1, the cathode of voltage stabilizing diode D1 is connected with the power input end, the anode of voltage stabilizing diode D1 is connected with filtering capacitor C1 and voltage dividing resistor R1, the anode of voltage stabilizing diode D1 is as floating ground GND_D, voltage dividing resistor R1 is connected with base circuit GND, to make the anode of voltage stabilizing diode as the reference ground of PMOS tube gate control signal.The utility model provides a kind of wide voltage input protection circuit for the voltage lifting of MOS tube through floating ground circuit, significantly improves MOS tube circuit power adaptability and operating reliability.

The application provides an integrated Boost voltage increasing module structure, which comprises a high-voltage plug-in, a fast charging socket, a battery socket and an integrated module; the fast charging socket and the battery socket are fixedly connected with a fast charging copper bar; the integrated module is connected with the high-voltage plug-in; the fast charging socket and the battery socket are both connected with the integrated module; and the integrated module comprises a filtering assembly. By using the integrated module, the Boost structure is highly integrated, the material is saved, the space occupied by the voltage increasing module is reduced, the installation and dismounting are convenient, the heat dissipation performance is good, the filtering effect is good, the vehicle space is saved, the wire harness wiring length and complexity of the whole vehicle are saved, the current is subjected to two-stage filtering treatment by using the filtering assembly, the interference signal is reduced, the filtering assembly structure is highly integrated, the copper bar and the filtering plate are connected, the filtering capacitor is directly connected with the power supply and the ground through the copper wire laid in the circuit board, the structure design is ingenious and complex, and thus the area occupied by the voltage increasing module is small.

Disclosed in the present invention is a filter circuit. A first PCB layer consists of a power line, a power interface, a second filter capacitor, and a first filter capacitor; the power line comprises a power supply network and a GND network; the second PCB layer is provided with a conductor plane; the power interface is connected to the GND network and is further connected to the conductor plane; the GND network, the second filter capacitor, and the conductor plane are sequentially connected; the power supply network, the first filter capacitor, and the conductor plane are sequentially connected. The circuit design of the circuit structure and the overall layout design idea in the present invention have a good suppression effect on common-mode noise, differential mode noise, radiation noise and conduction noise.

This application discloses an automatic calibration circuit and method for mismatch compensation current of a phase-locked loop (PLL) charge pump, relating to the field of integrated circuit technology. The calibration circuit includes: a frequency and phase detector, a charge pump, an XOR module, a filter capacitor, a digital-to-analog converter (DAC) module, and a digital logic state machine. The first output terminal of the frequency and phase detector is connected to the first input terminal of the charge pump and the first input terminal of the XOR module, respectively. The second output terminal of the frequency and phase detector is connected to the second input terminal of the charge pump and the second input terminal of the XOR module, respectively. The output terminal of the XOR module is connected to the first terminal of the filter capacitor and the input terminal of the DAC module, and the second terminal of the filter capacitor is grounded. The output terminal of the DAC module is connected to the input terminal of the digital logic state machine, and the output terminal of the digital logic state machine is connected to the third input terminal of the charge pump. The output terminal of the charge pump is used to connect to the input terminal of the low-pass filter in the PLL. This application can compensate for the mismatch current of the charge pump in real time.

The utility model discloses a bus safety window opening alarm, including main control circuit, detection module, alarm module and power module, and main control circuit adopts special alarm chip ATW51H. Detection module is connected through JP1, JP2 interface, and is connected in parallel 16V / 0.1muF filter capacitor C2 to filter out the spurious echo, the drive circuit of alarm module is two stage series connection structure, is composed of triode Q3, triode Q2 and transformer T1, can enhance the driving capacity and protect the element, and power module contains triode Q1, switch S1 and LED pilot lamp D1, realizes the power supply management and control and state indication. Special alarm chip pin connection is reasonable, and the stability is promoted with the cooperation of auxiliary resistance. The alarm aims at improving the accuracy of safety window opening state detection, driving reliability and operating stability, realizes real -time monitoring and reliable alarm.

This invention provides a switching power supply, an AC-DC circuit, an input voltage detection circuit, and a method. The first end of the secondary coil of a transformer is connected to the anode of a rectifier diode, and the cathode of the rectifier diode is connected to the positive terminal of a filter capacitor. The second end of the secondary coil of the transformer, the negative terminal of the filter capacitor, and the positive terminal of the sampling capacitor are all grounded. The cathode of the diode is connected to the first end of the secondary coil of the transformer, and the anode is connected to the negative terminal of the sampling capacitor. The negative terminal of the sampling capacitor is grounded sequentially through a third sampling resistor and a second sampling resistor. The common terminal of the third and second sampling resistors is connected to a voltage detection terminal and, through a first sampling resistor, to a reference voltage input terminal. A reference voltage is input to the reference voltage input terminal. The control unit detects the voltage at the voltage detection terminal and calculates the magnitude of the input AC voltage based on the relationship between the AC voltage and the voltage at the voltage detection terminal.

The invention relates to the technical field of inverters, and discloses a coupling inductor wide buck-boost leakage-current-free grid-connected inverter, which comprises a direct-current power supply, a first inverter circuit, a filter capacitor, a filter inductor, an alternating-current power supply, a detection circuit and a control circuit, the first inverter circuit comprises a first capacitor, a second capacitor, a first metal oxide semiconductor field effect transistor, a second metal oxide semiconductor field effect transistor, a first diode, a second diode, a third metal oxide semiconductor field effect transistor, a fourth metal oxide semiconductor field effect transistor, a first inductor and a second inductor; a third diode, a fourth diode, a fifth diode, a fifth metal oxide semiconductor field effect transistor and a sixth metal oxide semiconductor field effect transistor; a detection circuit; and a control circuit. According to the invention, the cost and the size are reduced, and the magnetic loss is reduced; common-mode leakage current is suppressed; the service life of the whole inverter is prolonged; and active and reactive current support can be provided for a power grid.

An input signal may be converted to a first PWM signal and a second PWM signal at a PWM controller circuit. The first PWM signal and the second signal output may drive a driver circuit. The driver circuit may receive a high voltage power supply from a boost converter or other power supply circuit. The driver circuit may include a high side device and a low side device. The output of the driver circuit may drive a filter circuit that includes a filter capacitor, an inductor, and a haptic actuator. The haptic actuator may generate a desired haptic response at the haptic actuator.

The utility model discloses a converter system, and relates to the technical field of vehicle engineering. The converter system comprises a converter body formed by cascading a plurality of same basic power subunits, the input end of the converter body is used for being directly connected with a single-phase traction network, and the output end of the converter body is used for independently driving a plurality of traction motors. The output end of the converter body is provided with a three-phase output filter capacitor. According to the converter system, the basic power subunits are cascaded to form the converter main body, so that the current-carrying capability and the voltage endurance capability can be improved; and the output end of the converter main body is provided with a three-phase output filter capacitor, so that when the transformer main body outputs voltage to drive the traction motor, the torque ripple and electromagnetic noise of the traction motor can be reduced.

The application relates to the technical field of switching power supply, and discloses a bridge type low-stress passive soft switching boost power factor correction circuit, which comprises a direct current input power supply, a main power switching tube, an output filter capacitor and a coupling inductor comprising a primary side and a secondary side; a passive soft switching buffer network is connected to a main circuit of the circuit, the network comprises a diode full-bridge structure and a buffer capacitor, and the leakage inductance of the secondary side of the coupling inductor is connected between the midpoints of two bridge arms of the full-bridge structure; the application utilizes the ratio difference of the coupling inductor to generate a forward potential difference, drives the buffer capacitor to reversely charge to establish a negative voltage, and further provides a discharge circuit for the parasitic junction capacitance of the main power switching tube, so that zero voltage turn-on is realized, and high-frequency switching loss is reduced; meanwhile, the highest voltage stress of the semiconductor device is clamped in the range of the direct current output voltage through the potential restriction of the full-bridge network. The application does not need auxiliary active devices, and improves conversion efficiency and reliability while simplifying the system structure.

The invention provides a high-precision voltage-stabilizing constant-current power supply for continuous discharge of a CO2 laser, which relates to the technical field of high-voltage voltage-stabilizing constant-current power supplies and comprises a high-voltage direct-current voltage-stabilizing power supply and a high-impedance amplification loop. The high-voltage direct-current voltage-stabilized power supply is boosted by a transformer, rectified by a rectifier bridge and stabilized by a filter capacitor, and continuously adjustable high-voltage output of 0-30kV is provided; the high-impedance amplification loop is composed of an operational amplifier, a three-stage triode amplification circuit and an electronic tube, the output impedance reaches up to 650 megohms, and the high-impedance amplification loop has the excellent constant-current characteristic. The power supply can accurately adjust the output current in the range of 0-30mA, the current fluctuation is less than one thousandth, the power supply can continuously and stably operate for more than 18 hours, and the power supply is suitable for laser discharge control in a high-temperature and high-density plasma environment. According to the invention, high-precision output is realized by adopting common performance devices, the advantages of voltage resistance, overload resistance and cost are considered, and the problems of poor current stability and inconvenient adjustment of a traditional laser power supply are solved.

The application relates to an acoustic device and a wireless communication device. The acoustic device comprises an external terminal, a band-stop terminal and a band-pass terminal; a band-pass filter, one end of which is electrically connected to the band-pass terminal, and the other end of which is electrically connected to the external terminal; a band-stop filter, one end of which is electrically connected to the band-stop terminal, and the other end of which is electrically connected to the external terminal; and a filter capacitor, which is connected in parallel to the band-stop filter between the external terminal and the band-stop terminal. The application can effectively improve the insertion loss deterioration problem of the high-frequency band-pass part of the band-stop filter.

The application discloses a self-adaptive aviation power grid input filter capacitor simplification compensation method, which simplifies input filter capacitor current to be compensated, and uses a simplified triangular wave to approximate a cosine for compensation, so that the calculation amount is greatly simplified; and the method adaptively simplifies a triangular wave approximation compensation function with the change of an input frequency and an input voltage effective value, so that the calculation amount can be further simplified. The method fully considers the problem of small storage or weak calculation capacity of the current domestic digital controller, and has strong use value for the current aviation power source domestic substitution.