48results about How to "Increase input current" patented technology

The invention relates to an electric energy feedback type electronic load. The input end of the electronic load employs a large-current single-channel access mode. A main circuit mainly comprises a DC/DC conversion circuit, a DC/AC inverter circuit, and an AC filter output circuit, wherein the DC/DC conversion circuit employs a phase-shifted full-bridge circuit to achieve the control of DC input, and boosts DC input voltage. In order to adapt to large-current input, a switching device is formed by parallel connection of a plurality of MOSFETs. The DC/DC conversion circuit is connected with the DC/AC inverter circuit through a DC bus. The DC/AC inverter circuit employs a single-phase full-bridge inverter circuit to control AC output current so as to stabilize the voltage of the DC bus and feeds the AC current back to a power network by a unit power factor. The DC/AC inverter circuit employs an IGBT module as a power device. The AC filter circuit can employ an LC low-pass filter circuit so as to eliminate the higher harmonic waves in the output current of the DC/AC inverter circuit and improve the quality of grid-connected electric energy.

The invention provides an LED drive chip capable of improving the thyristor dimmer compatibility and a circuit. The chip is connected with a peripheral circuit including a thyristor dimmer and an input current sampling resistor. The chip comprises a hysteresis comparator, a transconductance module, a first NMOS tube, a first PMOS tube, a second PMOS tube, a second NMOS tube, a compensation capacitor, an isolation capacitor, a first comparator and a drive module. According to the invention, the input current is increased without directly pulling down the bus voltage Vin; a part where the input current is increased is used as a part of output current; compared with the figure 1 in the prior art, the chip has remarkably improved efficiency, and particularly in the case of small output current, the efficiency is remarkably improved; and in addition, the cost is reduced without using a high voltage MOS tube and additionally increasing chip pins.

The invention discloses a series composite structure double-frequency and multi-amplitude piezoelectric ultrasonic transducer applied to a thermal ultrasonic wire bonding and sealing process of an integrated circuit chip. The transducer is composed of two sets of double-ended radiating piezoelectric oscillators and two two-stage mechanical variable-amplitude poles with different amplification factors. The transducer can work at the frequency near the frequency of 60 kHz or 120 kHz and has three driving modes. Under simple harmonic excitation signals with the same frequency, the transducer canobtain multiple amplitude outputs to meet the different requirements of the wire bonding process of the integrated circuit chip and improve the bonding connection efficiency and reliability. Meanwhile, clamping mechanisms of the composite structure ultrasonic transducer adopt flexible flange clamping mechanisms formed by circular arc hinges, the influence of the clamping rack disturbance torque onthe ultrasonic transmission efficiency in the axial ultrasonic transmission process of the variable-amplitude pole can be effectively lowered, and the utilization rate of ultrasonic energy is increased.

The invention provides a mower. The mower comprises a storage battery, a current control device, a controller and mowing equipment, wherein the storage battery is electrically connected with the mowing equipment through the current control device; the mowing equipment comprises a driving motor, and the driving motor comprises a rotation speed sensor which is arranged on an output shaft of the driving motor; the rotation speed sensor is connected with the current control device through the controller; the controller is used for obtaining a rotation speed value of the rotation speed sensor, and when the rotation speed value is smaller than a preset rotation speed threshold value, the output current of the current control device is increased. The mower has the advantages that the mowing efficiency is high, the output power of the mower can be intelligently adjusted, the rotation speed of the driving motor is adjusted, the waste of energy is avoided, and the energy-saving and environment-friendly effects are realized.

The invention discloses a power factor correction circuit. The circuit comprises a PFC pre-circuit including the AC input, a rectifier circuit and a filter capacitor; a PFC master circuit connected with the PFC pre-circuit; a master control circuit with an output end connected with the PFC master circuit; a feedback circuit with the output end connected with the input end of the master control circuit; and a compensation circuit with the output end connected with the feedback circuit and used for outputting a compensation signal in each preset interval so as to improve the input current of thePFC master circuit through the feedback circuit, wherein each preset interval is the input voltage zero-cross time quantum of the AC input, each preset interval is in periodical change, and the period is same as the period of the input voltage. By applying the scheme disclosed by the invention, the current abnormity caused by the filter capacitor is avoided when the input AC voltage is near the zero-cross, and the power factor and the total harmonic content of the switch power supply satisfy the requirement. The invention further provides power supply equipment with the corresponding effect.

The invention relates to the technical field of oil-immersed transformers, and discloses a winding mechanism for a concentric winding of an oil-immersed transformer and application of the winding mechanism. The winding mechanism comprises an iron core, wherein the top of the iron core is fixedly connected with a mercury box; an extrusion plate is connected into the mercury box in a sliding manner;the bottom of the extrusion plate is fixedly connected with a force storage rod; the side face of the force storage rod is in engaged connection with a bearing wheel; the surface of the bearing wheelis connected with a screw in a meshed mode; the side face of the screw is connected with a rotating shaft in a meshed mode; the side face of the force storage rod is slidably connected with an extrusion rod; the right side of the extrusion rod is rotatably connected with a driving wheel; a meshing rod is arranged on the side face of the driving wheel in a penetrating mode; and a conical shaft isarranged below the driving wheel. According to the winding mechanism for the concentric winding of the oil-immersed transformer and the application of the winding mechanism, through cooperative use ofthe mercury box and a cutting frame, the effect of automatically compensating leaked electric energy for a load when the magnetic flux leakage phenomenon affects work of the transformer is achieved.

The invention discloses an LED drive power source self-discharge method and a circuit module applicable to alternating-current dimmers. The LED drive power source self-discharge method applicable to alternating-current dimmers comprises the following steps: adjusting the switching frequency and duty ratio of a main switching device, and generating an additional load current on the input side of an LED drive circuit to meet the need of a dimmer for the holding current. According to the invention, the switching frequency of the main switching device is increased to enable the LED drive circuit to generate a certain current on the input side to meet the need of the dimmer, without increasing the power on the output side. The LED drive power source self-discharge method and the circuit module of the invention are applicable to a variety of power electronic topologies including boosting, bucking, forward activation and reverse activation.

The invention discloses a multi-ridge type semiconductor laser capable of reducing inter-bridge crosstalk and a preparation method thereof. The multi-ridge type semiconductor laser comprises a substrate and an epitaxial structure including a lower limit layer, a lower waveguide layer, an active layer, an upper waveguide layer, an upper limit layer and the like. The epitaxial structure includes a plurality of ridge portions; each ridge portion reaches the space below the active layer from the top of the epitaxial layer; and gaps among the ridge portions are filled with high-resistance low-thermal-conductivity low-refractive-index materials, so that active regions of all ridge portions are isolated mutually. And then ohmic contact electrodes are arranged at the upper parts of the ridge portions in a one-to-one correspondence manner and are provided with top electrodes for connection. With the multi-ridge type semiconductor laser, the mutual independence of electricity and light between the ridge portions is realized; and the thermal crosstalk among the ridges is reduced effectively. Therefore, a solution idea is provided for obtaining a high power laser.

The invention provides a power supply of a 5G communication base station with high driving power. The power supply for the 5G communication base station comprises a PFC circuit connected with power supply equipment, the PFC circuit comprises a power amplification module, the power amplification module drives two MOS transistors to be conducted through an IC chip so as to increase input current, and a power factor value is effectively improved on the premise of controlling cost.

The present invention provides a laser power automatic control system. The system comprises a PIN tube configured to detect the backlight of the laser, wherein the PIN tube is installed at the side of the laser and is connected in parallel with an operational amplifier; the output end of the operational amplifier is connected with the negative end of a comparator, and the positive end of the comparator is connected with a direct current reference voltage branch which is a current-limiting resistor arranged between the grounding and the high level with reference voltage; the center tap of the current-limiting resistor is connected with the positive end of the comparator, and the output end of the comparator is connected with a central control unit; and the laser is further connected with a switch power supply convertor, the central control unit includes an ADC convertor and a DAC convertor, and the pin of the DAC convertor of the central control unit is connected with the feedback voltage pin of the switch power supply convertor. The laser power automatic control system is simple in structure and can automatically control the power of the laser to allow the output power of the laser to keep basic constant.

The invention relates to a magnetic powder clutch step-less speed regulation device, which comprises a power input axle, a speed-detecting sensor, a magnetic powder clutch, a power output axle, and a control part. Wherein, the power input and output axles are individually mounted at two sides of magnetic powder clutch, while they are mounted with speed-detecting sensors; the control part comprises a power amplifier, a control unit, and a display and button box; the magnetic powder clutch is connected to the power amplifier; the speed-detecting sensor is connected to the control unit; the control unit via using the speed-detecting sensor to detect the rotational speeds of power input and output axles to set the input current of magnetic powder clutch to adjust the output torque of magnetic powder clutch, to step-less regulate the rotational speed of power output axle.

The invention discloses a device for 1600 A electric energy meter detection based on parallel CTs. The device includes a computer, a voltage source, a current source, a booster, a first converter, a second converter, a standard meter, an error calculation unit, a detected electric energy meter and a first transformer, a second transformer, a third transformer and a fourth transformer which are connected in parallel. The detected electric energy meter includes a first calibrated meter, a second calibrated meter and a third calibrated meter which are connected in parallel. The device of the invention adopts a mode of parallel CTs, that is, the first transformer, the second transformer, the third transformer and the fourth transformer are connected in parallel, to increase output current without increasing input current. The maximum output current of the device is 1600 A, and the device can realize verification requirements of multiple different types and different meters.

The invention discloses an automobile exhaust emission purification device convenient to disassemble and assemble, and belongs to the field of automobiles. The automobile exhaust emission purification device convenient to disassemble and assemble comprises an exhaust pipe and a purification pipe, wherein external threads are arranged on the outer wall of the left end of the purification pipe, the outer wall of the external threads is sleeved with a threaded sleeve, the left end of the purification pipe is fixedly connected with a plurality of trapezoidal clamping plates distributed circumferentially, and a containing groove is formed in the inner wall of the right end of the purification pipe; and an annular sleeve is arranged in the containing groove, a first filter plate and a second filter plate are fixedly installed in the annular sleeve, the right end of the purification pipe is rotationally connected with an exhaust sleeve matched with the left end of the purification pipe, the exhaust sleeve is connected with the purification pipe through a positioning mechanism, and a power-assisted exhaust device is arranged in the exhaust sleeve. According to the invention, tail gas of an automobile is purified through the double filter plates, so that a good purification effect is achieved; and the exhaust capacity of the exhaust pipe can be effectively improved through the arranged power-assisted exhaust device, so that resistance of the filter plates to the exhaust pipe is reduced.

The invention relates to a push-pull signal power amplification circuit and system. The push-pull signal power amplification circuit comprises a PWM-MAP push-pull power amplification circuit and a PWM-MAN push-pull power amplification circuit. The PWM-MAP push-pull power amplification circuit comprises a first differential conversion module, a first bootstrap amplification module electrically connected with the first differential conversion module, a first H half-bridge module electrically connected with the first differential conversion module and the first bootstrap amplification module, and a first resistance power amplification module; the PWM-MAN push-pull power amplification circuit comprises a second differential conversion module, a second bootstrap amplification module electrically connected with the second differential conversion module, a second H half-bridge module electrically connected with the second differential conversion module and the second bootstrap amplification module, and a second resistance power amplification module; therefore, the system does not need to depend on an inherent circuit of a traditional power amplifier, power amplification can be carried out on the PWM push-pull signal, the noise interference resistance is high, and the sound quality requirement for amplification of vehicle-mounted audio equipment can be met.

The invention provides a terminal and a charging method, and relates to the field of communication technology. The terminal is provided with charging ports to meet the requirement of rapid charging of the terminal. The terminal comprises a battery, a power management chip and at least two charging ports, the charging ports are connected to the power management chip, and the power management chip manages charging of the battery. The charging method suitable for the terminal comprises that when certain charging port starts working, the power management chip detects the amount of the working charging ports; when the detected amount of the working charging port is greater than 1, the power management chip determines the input current of the battery according to the total input current of the working charging port; and the battery is charged via the determined input current. Technical schemes provided by the invention are suitable for the charging process of the terminal.