12results about How to "Reduce output voltage" patented technology

The invention relates to an Ethernet power supply, which is used for being coupled with load equipment. The Ethernet power supply comprises a power supply device, an output control circuit, a path control circuit and a control module, when the output control circuit detects that the load device is not coupled to the output end of the Ethernet power supply, the path control circuit breaks the power supply path from the output end to the control module, and the output control circuit adjusts the output voltage to a first voltage, so that the control module enters a forbidden state. When the output control circuit detects that the load device is coupled to the output terminal, the path control circuit short-circuits the power supply path, and the output control circuit adjusts the output voltage to the second voltage, so that the control module enters an enabled state. The invention also relates to a step-down control circuit and a control method of the Ethernet power supply.

The utility model relates to oil field casing drilling, in particular to a sensor for casing screwing-on measurement, and aims to solve the problem that the error correction result is inaccurate due to the temperature difference between the placement position of a temperature sensor and the patch position of a strain gauge and the self measurement error of the temperature sensor. According to the utility model, through the arrangement of the PCB groove, the radio frequency antenna groove and the battery hole, the number of turns of thread rotation in the threaded connection process of casing drilling equipment and the torque generated during thread matching can be monitored at the same time, and the quality of threaded connection between equipment can be ensured more effectively. And the design of a Wheatstone bridge temperature compensation circuit can be completed according to the sensitivity of the negative temperature coefficient of the strain gauge and the resistance change of the positive temperature coefficient. Through the feedback mechanism of the compensation circuit, the reduction of the output voltage of the strain gauge Wheatstone bridge circuit caused by the temperature can be effectively compensated.

The invention provides an analog quantity safety barrier circuit, a safety barrier system and an industrial cabinet. The analog quantity safety barrier circuit comprises a safety side circuit and a danger side circuit which are electrically isolated through transformers, the danger side circuit comprises a first signal coupling unit and a second signal coupling unit, and the input ends of the first signal coupling unit and the second signal coupling unit receive signals from a safety side through corresponding signal transformers respectively; the input ends of the first rectifying and filtering unit and the second rectifying and filtering unit are correspondingly connected to the output ends of the first signal coupling unit and the second signal coupling unit respectively, and the power supply ends receive energy from the safety side through corresponding power supply transformers respectively; and the series boosting unit is configured to take the direct-current output voltage of the first rectifying and filtering unit as the reference ground potential of the second rectifying and filtering unit, so that the output voltages of the first rectifying and filtering unit and the second rectifying and filtering unit are connected in series and superposed to form a composite power supply for supplying power to a dangerous-side field transmitter. According to the analog quantity safety barrier circuit, the power consumption of the analog quantity safety barrier circuit can be reduced.

The embodiment of the utility model provides an inverter adopting an electromagnetic compatibility design, and the inverter comprises an input side electromagnetic interference filtering module of which the input end is connected with a DC input interface; the input end of the power supply switching unit is connected with the output end of the input side electromagnetic interference filtering module; the input end of the common mode inductor is connected with the output end of the power supply switching unit; the input end of the inversion unit is connected with the output end of the common mode inductor unit; and the input end of the alternating-current inductor-capacitor-inductor filtering module is connected with the output end of the inversion unit, and the output end of the alternating-current inductor-capacitor-inductor filtering module is connected with an alternating-current load interface.

The invention provides a modular energy-taking power supply, a sub-module and a modular multilevel converter. The modular energy-taking power supply can comprise a control module, a plurality of isolation modules and a plurality of voltage-sharing modules. The plurality of isolation modules are connected with the plurality of voltage-sharing modules in a one-to-one correspondence manner. The control module is used for sending a control signal to each isolation module. The isolation module is used for reducing the input voltage and providing the output voltage for the control system. The voltage-sharing module is used for providing input voltage for the isolation module. The size of the energy-taking power supply is greatly reduced, the power density of the energy-taking power supply is increased, and the heat dissipation speed is increased. According to the invention, the plurality of voltage-sharing modules are connected in series for voltage division, so that normal operation of the sub-modules can be maintained under the condition that a single power supply loop fails, the modular energy-taking power supply can adapt to higher working voltage, the sub-modules are prevented from using expensive power devices, and the cost of the sub-modules is reduced.

The application relates to a linear voltage stabilizer, which comprises a stabilizer input end, a stabilizer output end, a voltage stabilizing circuit and a low-resistance circuit. The stabilizer input end is used for connecting a voltage, the voltage stabilizing circuit is connected with the stabilizer input end and the low-resistance circuit, the low-resistance circuit is connected with the stabilizer output end, and the low-resistance circuit is used for reducing the output resistance of the linear voltage stabilizer. The output voltage is stabilized through the voltage stabilizing circuit, the output resistance is reduced through the low-resistance circuit, the output voltage ripple is reduced, and the purpose of improving the stability of the circuit can be achieved.

The utility model discloses a multipath isolation power supply voltage controller, relates to the multipath power supply control technology field, and comprises a gear selection module, a control module and a power supply module which are adaptively connected, the control module comprises a plurality of control units, the power supply module comprises a plurality of power supply units, and the power supply units are connected with the gear selection module. The plurality of control units are in one-to-one correspondence with the plurality of power supply units; the gear selection module is used for selecting a target gear from a plurality of preset power supply voltage gears, the control unit comprises a plurality of switch elements, and the plurality of switch elements in the control unit are in one-to-one correspondence with the plurality of power supply voltage gears; in any control unit, the switch element corresponding to the target gear is used for controlling the corresponding power supply unit in the power supply module to output the power supply voltage corresponding to the target gear. The multipath isolation power supply voltage controller provided by the utility model can synchronously adjust the output voltage of multipath power supplies, and has the technical characteristics of high reliability, simple operation and convenient maintenance.

This invention discloses a cholesteric liquid crystal display device and its driving method, belonging to the field of display technology. The device integrates a source switching module and an external driving module on a first substrate, respectively connected to the data leads of the driving chip, the external power supply, and the internal data lines. The driving method is executed by a timing control module. First, the external driving module is turned on to initialize the screen using an external high-voltage signal. Then, the system switches to the source switching module, using the low-voltage data signal from the driving chip and writing the image via time-division multiplexing. Finally, the display can be maintained by simultaneously turning off both modules to make the pixels float. This invention achieves safe switching of the driving source through structural innovation, effectively reducing the performance requirements of the driving chip, avoiding current backflow, and significantly reducing the number of chips used.

The invention discloses an inverter system and a direct current side ground short circuit protection method, and relates to the technical field of electronic power, the inverter system comprises a controller, an inverter, an alternating current side device and at least one direct current side device, the at least one direct current side device is connected with a direct current input side of the inverter through a bus capacitor, the alternating current output side of the inverter is connected with alternating current side equipment; the direct current side equipment comprises a direct current conversion module and a controller, and is used for controlling the direct current conversion module to reduce the output voltage of the direct current side equipment under the condition that the direct current input side of the inverter is short-circuited to the ground so as to reduce the voltage of the direct current side equipment for charging the bus capacitor; or the direct current side equipment comprises a bypass switch and a controller, and is used for controlling the bypass switch to be closed under the condition that the direct current input side of the inverter is short-circuited to the ground, so as to disconnect the charging path of the direct current side equipment to the bus capacitor. According to the invention, the overvoltage damage of the bus capacitor can be avoided at high efficiency and low cost when the direct current side is short-circuited to the ground.

The utility model discloses an HID filament lamp compatible with an inductive ballast, which comprises a driving circuit and a filament lamp bulb light bar, and is characterized in that the driving circuit comprises an input protection unit for overcurrent protection and is connected with the inductive ballast; the pre-stage resistance-capacitance voltage reduction unit is connected with the inductive ballast and is used for receiving the output constant power of the inductive ballast and adjusting the output constant power to reduce the voltage and the current; the filtering unit is connected between the output end of the input protection unit and the input end of the pre-stage resistance-capacitance voltage reduction unit and is used for inhibiting electromagnetic interference; the rear-stage voltage doubling rectifying unit is connected with the output end of the input protection unit and the output end of the front-stage resistance-capacitance voltage reduction unit and used for boosting voltage so as to reduce front-stage energy efficiency loss, and a filament lamp bulb light bar is connected to the output end of the rear-stage voltage doubling rectifying unit; the output discharging unit is connected in parallel with the output end of the rear-stage voltage doubling rectifying unit and is used for balancing the discharging current; the utility model has the advantages of realizing perfect compatibility with North America inductance ballasts, improving the energy efficiency and reducing the cost.

The utility model relates to circuit board technical field discloses a kind of standby power consumption devices of reducing circuit board, comprising: rectifier filter module, transformer, feedback adjustable resistance group, feedback regulation module and power supply module.The input end of rectifier filter module is connected with external power supply end, and the output end of rectifier filter module is connected with the primary coil of transformer;The output end of feedback regulation module is connected with the primary coil of rectifier filter module and transformer, and the primary coil of transformer is equipped with auxiliary winding voltage port;Feedback adjustable resistance group is connected with auxiliary winding voltage port and the input end of feedback regulation module;The secondary coil of transformer is connected with the input end of power supply module;When determining the current resistance of feedback adjustable resistance group, feedback regulation module adjusts the voltage of auxiliary winding voltage port, to reduce the power supply voltage output by power supply module, to reduce load power consumption, to reduce the standby power consumption of complete machine, facilitate to carry out the test of different power consumption demand, reduce test cost.

The application relates to a charging control method and device, equipment and a storage medium, and relates to the technical field of automobiles. The method comprises the following steps: when a vehicle battery is connected to a charging pile, it is determined that the step-down output voltage of an energy conversion device is reduced to a first charging voltage within a preset time length; the energy conversion device is controlled to be in a step-up mode, and the step-up output voltage is adjusted to be a first output voltage and the step-up output current is adjusted to be a first charging current; when the output current of the charging pile is determined, the output voltage of the charging pile is raised to a second output voltage, and when it is determined that the maximum rated voltage of the charging pile is less than a preset voltage, the vehicle battery is charged by the charging pile. Therefore, the vehicle battery can be charged in a step-up mode or a direct current mode based on the maximum rated voltage of the charging pile and the preset voltage, and the technical problems that the charging time is prolonged and the charging circuit needs to be switched multiple times when the maximum output capacity of the charging pile is directly used as a charging mode switching condition for charging mode switching are solved.