53results about How to "Stable static operating point" patented technology

The invention discloses a local discharging sensor combining a graphene diaphragm with a micro optical fiber interference cavity and a detection method based thereon. The local discharging sensor comprises a tunable laser device (1), a laser device wavelength control module (2), an optical fiber circulator (3), monomode optical fiber (4), the micro optical fiber interference cavity (5), a photoelectric detector (6), a signal line (7), a filter (8) and a data collection card (9). A multilayer graphene membrane is adopted, so that detection sensitivity of the sensor is improved; on the basis ofstructure optimization design of the multilayer graphene membrane, the multilayer graphene membrane is enabled to adapt to local discharging detection frequency band requirements; a polyimide coatingis adopted to prolong service life of the multilayer graphene membrane; femtosecond laser is adopted to process the micro optical fiber interference cavity inside optical fiber, and a static-state working point is stabilized on the basis of laser device wavelength control. On the basis of optimization design of a detection device mounting mode, original working environment of electrical equipmentis unaffected during mounting of the local discharging sensor.

The invention discloses an audio power amplification system based on a ripple suppression circuit, which is characterized in that it is mainly composed of a preamplifier circuit, a triode VT2, a current limiter, and the positive pole is connected with the preamplifier circuit, and the negative pole is connected with the current limiter. Capacitor C3 connected to the input terminal, resistor R5 connected to the collector of the triode VT2 at one end and grounded at the other end, a ripple suppression circuit connected to the emitter of the transistor VT2, a power amplifier circuit connected to the ripple suppression circuit, and positive pole It is composed of a capacitor C4 connected to the preamplifier circuit, and the negative electrode is connected to the power amplifier circuit. The invention can filter the ripple voltage, thereby reducing the electromagnetic noise of the system and improving the stability of the system.

The invention discloses a 5.8 GHz single transistor microwave motion sensor. The 5.8 GHz single transistor microwave motion sensor includes a circuit board and a microwave movement sensor circuit disposed on the circuit board, wherein the microwave sensor circuit includes an oscillating mixing unit and a signal transceiver unit, the oscillating mixing unit and the signal transceiver unit are respectively disposed on a circuit layer and an antenna layer of the multi-layer circuit board, the oscillating mixing unit is a triode, the signal transceiver unit is a microstrip transceiver antenna, thetriode is disposed on the circuit layer, and the microstrip transceiver antenna is disposed on the antenna layer. The 5.8 GHz single transistor microwave motion sensor is advantaged in that one transistor is utilized to complete signal transmission, reception and frequency conversion, functions of a traditional 5.8 GHz microwave motion sensor needing more than two transistors are achieved, the single microstrip antenna is utilized to form signal transmission and reception, the circuit is made to be more simplified, cost is lower, and the 5.8 GHz single transistor microwave motion sensor is easy to promote and apply.

The invention discloses a linearized bias circuit and a radio frequency power amplifier, and belongs to the technical field of radio frequency power amplifiers. The radio frequency power amplifier comprises a linearized bias circuit and a radio frequency amplifier unit circuit. The linearized bias circuit is electrically connected with the radio frequency amplifier unit circuit; by improving the circuit structure and introducing the structure of the current mirror, temperature compensation is carried out for the problem of heating under high power, the temperature drift of a static working point is inhibited, and the problem of poor high-power output linearity of the power amplifier is solved while the area of the bias circuit is not excessively increased.

The invention discloses a high-performance signal processing system for a cruising device based on a multiple self-sensing technology. The high-performance signal processing system mainly comprises a processing chip U, an infrared camera WS, a field effect transistor MOS1, a triode VT3, a polar capacitor C8, a synchronizing signal regulation circuit, a differential amplification circuit, an image signal preprocessing circuit, an output signal amplification circuit which is respectively connected with a PIUT pin of the processing chip U and an emitting electrode of the triode VT3, and the like. According to the high-performance signal processing system disclosed by the invention, a low-frequency interference signal in image signals can be eliminated or suppressed, and phases and frequencies of image data signals also can be amplified, so that an image signal processing effect of the high-performance signal processing system disclosed by the invention is improved, and accuracy of the image data signals received by a satellite positioning system is effectively ensured.

The invention discloses a highly-stable signal processing system for a sewage discharging network monitoring device based on big data. The highly-stable signal processing system is mainly formed by a processing chip U, a triode VT2, a polar capacitor C6, a polar capacitor C7, a signal bandwidth regulation circuit, a differential amplification circuit, a second-order lowpass filtering circuit, and a frequency error correcting circuit connected with a CS tube pin, a G tube pin and an OUT tube pin of the processing chip U. The differential amplification circuit is serially connected between a CLK tube pipe of the processing chip U and the frequency error correcting circuit. Low-frequency interference signals of the processing chip can be eliminated or prohibited; frequency point of the signal after anti-interference process can be amplified, so the signal can be more stable; phase positions of multi-carrier wave signals of data signals, and frequency errors can be corrected, so signal processing effect can be improved; and accuracy of sewage data information acquired from a data processing center can be effectively guaranteed.

A computer signal compensation circuit includes signal input circuitry, Operational Amplifier Calibration Circuit and Regulated Filter Circuit, the signal input circuit receives an analog signal froman input terminal of a signal transmission channel for signal received by a computer control terminal, the operational amplifier calibration circuit receives the output signal of the signal input circuit in two ways, within a noninverting input of an input op amp AR1, the other input transistor Q2, in a switching circuit composed of a transistor Q3 and a transistor Q9, at the same time, an operational amplify AR3 is designed to input the signal into a voltage stabilize filter circuit after comparing and processing the signals, at last, that voltage stabilize filter circuit adopts a voltage stabilizing circuit composed of a transistor Q6 and a voltage stabilizing tube D3, At the same time, a Pi-filter circuit composed of inductor L3, capacitor C6 and capacitor C7 is designed, which can automatically calibrate the analog signal in the signal transmission channel of computer control terminal, and improve the stability and efficiency of signal transmission.

The invention discloses a power grid energy-saving constant current drive control system based on emitter coupled amplification. The system is composed of an EMI single-phase filter, a silicon controlled rectifier, a boosting type power factor correcting circuit, a single-phase high-frequency frequency converter, a sampling protection circuit connected with the single-phase high-frequency frequency converter, a single-chip microcomputer, a band-pass filtering low-distortion oscillating circuit and a boosting type constant current driving circuit. The system is characterized in that an emitter coupled amplification circuit is also connected between the sampling protection circuit and the single-chip microcomputer in series; the boosting type constant current driving circuit is adopted, has the functions of under-voltage locking protection, over-voltage protection and over-temperature protection, has extremely high driving stability, and can effectively improve the accuracy of the control system; meanwhile, the emitter coupled amplification circuit is adopted and has a stable quiescent operating point, stable output current and high input resistance, and the energy-saving effect of the system is effectively improved.

The invention discloses a high-linearity radio frequency power amplifier. The power amplifier comprises an input matching circuit, a pre-stage amplifying circuit, a first linearization biasing circuit, a first inter-stage matching circuit, an intermediate-stage amplifying circuit, a second linearization biasing circuit, a second inter-stage matching circuit, a power-stage amplifying circuit, a third linearization biasing circuit, an output matching circuit and the pre-stage amplifying circuit, wherein the intermediate-stage amplification circuit and the power-stage amplification circuit respectively adopt A-class amplification structures, source degeneration inductors are respectively arranged in the intermediate-stage amplification circuit and the power-stage amplification circuit, and the pre-stage amplification circuit, the intermediate-stage amplification circuit and the power-stage amplification circuit respectively utilize the internal source degeneration inductors to carry out feedback so as to expand a linear working area; the first linearization bias circuit, the second linearization bias circuit and the third linearization bias circuit are active bias circuits designed based on a PMOS tube and an NMOS tube respectively; the advantages of the invention are that the gain is high while the linearity is higher.

The invention provides steam ablation equipment. The steam ablation equipment comprises a handle, a heating part, a power module, an injection part and a first processing circuit, wherein a containing cavity and a nozzle connected to the containing cavity are formed in the handle, the heating part is arranged in the containing cavity, the power module is electrically connected to the heating part to supply power to the heating part and enable the heating part to emit heat, and the injection part is connected to the containing cavity to inject water into the containing cavity. The first processing circuit comprises a first control module, a voltage comparison module, a temperature comparison module and a protection logic processing module, wherein the voltage comparison module and the temperature comparison module are both electrically connected to the first side of the protection logic processing module, and the first side of the protection logic processing module is electrically connected with the first control module.

The invention discloses an emitter-coupled amplification-based energy-saving control system for a smart power grid. The emitter-coupled amplification-based energy-saving control system comprises an electro-magnetic interference (EMI) single-phase filter, a silicon controlled rectifier, a step-up power factor correction circuit, a single-phase high-frequency converter, a sampling protection circuit, a single chip microcomputer and a band-pass filtering low-distortion oscillating circuit, wherein the silicon controlled rectifier is connected with the EMI single-phase filter; the step-up power factor correction circuit is connected with the silicon controlled rectifier; the single-phase high-frequency converter is connected with the step-up power factor correction circuit; the sampling protection circuit is connected with the single-phase high-frequency converter; the single chip microcomputer is connected with the sampling protection circuit; the band-pass filtering low-distortion oscillating circuit is connected between the step-up power factor correction circuit and the sampling protection circuit in series; and the emitter coupled amplification-based energy-saving control system is characterized in that an emitter-coupled amplifying circuit is also connected between the single-phase high-frequency converter and the single chip microcomputer in series. By the emitter-coupled amplifying circuit, the circuit has the effects of stabilizing a static working point, stabilizing output current and increasing the input resistance of the circuit; and the energy-saving effect of the system is effectively improved.

The invention relates to an ultralow noise analogue amplifier for a three-dimensional resistivity acquisition system, which comprises two parts. The first part is a directly coupled voltage series negative feedback ultralow noise amplifier consisting of six transistors; the second part is a low noise amplifier consisting of three operational amplifiers; in the first part, an emitting electrode on the second stage provides bias currents for base electrodes on the first stage; when the bias currents are obtained, DC (Direct Current) negative feedback is introduced, so that a static working point of a circuit is more stable; a capacitor is added into a bias feedback circuit, so that an input impedance of an amplification circuit is greatly improved; the second part is formed by two in-phase input universal integrated operational amplifiers of which the performance parameters are highly consistent, adopts double-end signal input and single-end signal output, has a very high common mode rejection ratio and a very good effect on interference suppression on an electromagnetic field and can enable the measurement accuracy to reach below 0.1muV, so that weights of field transmitting equipment and receiving equipment can be greatly reduced and working efficiency of electrical prospecting is greatly improved.

The invention discloses a low-distortion power amplifier system based on a peak clipping circuit, which is characterized in that it mainly consists of a static bias circuit, a power amplifier circuit connected with the static bias circuit, the negative pole is connected with the static bias circuit, and the positive pole is used as Capacitor C1 at the input end of the power amplifier system, one end is connected to the negative pole of capacitor C1, the other end is grounded resistor R1, the negative pole is grounded, the positive pole is connected to the power amplifier circuit after resistor R10, and the capacitor C5 is connected to the power amplifier circuit. The composition of the peak clipping circuit. The invention has a stable static working point, thereby ensuring that the waveform of the amplified signal is the same as that of the signal before amplifying, avoiding signal distortion caused by signal distortion after amplifying, and greatly improving the quality of sound playback.