49results about How to "Control output voltage" patented technology

The invention provides a rotating speed control method and device of a brushless DC fan, the brushless DC fan and a refrigerator. The rotating speed control method of the brushless DC fan comprises the following steps: detecting the real-time rotating speed of the brushless DC fan; comparing the real-time rotating speed with a target rotating speed; adjusting the current duty ratio of the driving voltage of the brushless DC fan according to the comparison result, so as to adjust the real-time rotating speed to be matched with the target rotating speed. According to the technical scheme, the rotating speed control method of the brushless DC fan has the advantages that the duty ratio of the driving voltage of the fan can be accurately controlled, thus the output voltage of the fan can be accurately controlled, and as a result, the accurate control of the rotating sped of the fan is realized, and the noise of the refrigerator is minimized.

The invention provides a locomotive traction converter which comprises a traction conversion cabinet, wherein a rectifier, a middle direct-current circuit and a traction inverter are fixedly arranged in the traction conversion cabinet, the output end of the rectifier is electrically connected with the input end of the middle direct-current circuit, and the output end of the middle direct-current circuit is electrically connected with the input end of the traction inverter. The locomotive traction converter further comprises an auxiliary converter, wherein the input end of the auxiliary converter is electrically connected with the output end of the middle direct-current circuit, and the auxiliary converter and the traction inverter are connected in parallel. The traction inverter and the auxiliary converter are integrated into the same traction conversion cabinet so that space occupation is reduced. Simultaneously, a circuit connection wire between the middle direct-current circuit and the auxiliary converter is shortened so that electromagnetic interference of external electrical elements on the locomotive traction converter is reduced.

The invention relates to a power supply control device for a power amplifier tube and a power-on and power-off control method thereof. The device comprises an MCU (Microprogrammed Control Unit) module, a temperature sampling module, a voltage DAC (Digital to Analog Converter) module, a power supply module and a drain electrode power supply control module; the MCU module is user for controlling the drain electrode power supply of the power amplifier tube and the negative voltage power supply of a grid in a unified mode, and the grid voltage can be conveniently, quickly and dynamically adjusted through the control of the negative voltage power supply of the grid, so that self-adapted dynamic adjustment under different working temperatures is realized, and correctness and reliability for power-on and power-off sequence of the power amplifier tube are ensured through the combination of the control of the grid power supply, thus the power amplifier tube can be better protected from being burnt by incorrect power-on and power-off timing sequence, the power-on and power-off control timing sequence of the power amplifier tube is met, the power amplifier tube is always at a good working condition, and the reliability of power amplification system is promoted. According to the power supply control device for the power amplifier tube, the correctness and reliability for power-on and power-off sequence of the power amplifier tube are ensured, and the reliability of the whole power amplification system is directly promoted.

The invention discloses a high-temperature high-pressure vacuumizing test device and an operating method thereof. The high-temperature high-pressure vacuumizing test device comprises a vessel holder (3), a console (4), a stander (1) for installing the vessel holder (3) and the console (4) and an interface (2), wherein a test vessel (6) which is used for arranging a test sample (5) and provided with a sealing cover is arranged in the vessel holder (3), and the high-temperature high-pressure vacuumizing test device also comprises a pressure system, a temperature system and a vacuum pump (8); the pressure system is arranged in the console (4), and the pressure system is communicated with the test vessel (6) to adjust the pressure value in the test vessel (6); the temperature system consists of a part which is arranged in the console (4) and a part which is arranged in an inner cavity of the test vessel (6), and the two parts of the temperature system are communicated with each other to adjust the temperature value in the test vessel (6); the vacuum pump (9) is arranged on the stander. The high-temperature high-pressure vacuumizing test device integrates the temperature system, the pressure system and the vacuumizing system.

An overvoltage protection circuit and method and a piece of electronic equipment provided by the invention relate to the technical field of overvoltage protection. The overvoltage protection circuit comprises a first impedance unit, a second impedance unit, a third impedance unit and a switch unit. A first end of the second impedance unit is connected with a second end of the first impedance unit.A first end of the third impedance unit is connected with the first end of the second impedance unit. A first end of the switch unit is connected with a second end of the third impedance unit, and asecond end of the switch unit is connected with a second end of the second impedance unit. When the voltage difference between the two ends of the second impedance unit acquired is greater than a preset value, the switch unit is switched on in order to reduce the voltage difference between the two ends of the second impedance unit through shunting of the third impedance unit and to reduce the voltage value of electrical energy output through the overvoltage protection circuit. Through the method, the problem in the prior art that the electrical circuit cannot work normally or the measurement accuracy of the output voltage of the power supply is affected due to the action of the overvoltage protection circuit can be solved.

The invention provides a data center power distribution system and method, the system includes a power distribution unit, an energy storage battery, a photovoltaic polar plate set and an oil engine, the overall design efficiency is high, energy conservation and emission reduction are achieved, and operation and maintenance are easy. The energy storage battery and the photovoltaic polar plate groupform a photovoltaic system, renewable energy sources are utilized by being connected into the photovoltaic system, electric power energy consumption is reduced, meanwhile, the occupied area is small,and the application scene of a data center is met. The energy storage battery is adopted to store electric energy collected by photovoltaic in the daytime, and the electric energy is used as a backuppower supply of a data center. According to the invention, access of photovoltaic equipment and an energy storage battery can be satisfied, output of 240VDC direct current and 220VAC alternating current can be provided, power is supplied to an IT load and an air conditioner at the same time, and the efficiency of a power distribution system is improved.

The present invention uses simple method to realize the controlling of the output electric tension in the control device of the alternating current voltage when the capacity of the equipment is not increased. Connect in parallel the single-phase two-wire system input terminals R1, S1 to one end and the other end of the autotransformer TR1 with center tapping, connect the input end S1 with output end S2 with pin cord c1, it includes a primary winding P whose one end is connected to one end of the autotransformer TR1, a transformer TR2 which do magnetic coupling to the primary winding P and is connected to the secondary winding S between the input end R1 and the output end R2; and a switch which switches the connecting objects of the other end of the primary winding P with any end in one end of the autotransformer, the tap, or the other end.

The invention belongs to the field of electronic communication and relates to a wireless energy transmission method, in particular to a wireless energy transmission method of an adaptive variable receiving coil. When the TX coil is fixed, the method of the invention controls the output voltage and improves the transmission efficiency by changing the area size of the RX coil in real time. While stabilizing the output of sufficient power, the method can avoid damage to the circuit board and improve the electromagnetic compatibility. Moreover, the method can reduce the voltage stabilizing chip inthe RX, thereby further improving the overall transmission efficiency. While stabilizing the output of sufficient power, the method can avoid damage to the circuit board and improve the electromagnetic compatibility. Moreover, the method can reduce the voltage stabilizing chip in the RX, thereby further improving the overall transmission efficiency.

The invention provides a continuous pressurizing device. The continuous pressurizing device comprises a barrel (6), piezoelectric ceramics (4) which is arranged inside the barrel (6), a slide block (3) which is arranged inside the barrel (6) and pressed on the upper surface of the piezoelectric ceramics (4) and a counter-jacking anvil (1), wherein the outer side wall of the slide block slides up and down along the inner side wall of the barrel (6); and a part of the counter-jacking anvil (1) is arranged inside the barrel (6) and pressed on the upper surface of the slide block (3). The continuous pressurizing device can continuously and precisely pressurize a sample to be tested.

The invention provides an electric welder arc striking device, which is a high-frequency sine wave controlled alternating-current or direct-current electric welder arc striking device with low requirement for contact resistance of a welded workpiece and high controlled arc striking sensitivity. The electric welder arc striking device consists of a voltage-stabilizing power supply circuit, a high-frequency sine wave generating circuit and an identification circuit. The controlled arc striking device consists of a voltage-stabilizing power supply, the high-frequency sine wave generating circuit and the identification circuit. The turn-on of a main power supply of an electric welder is controlled at the same time of controlling arc striking, and the main power supply is immediately and automatically turned off in 0.8 to 1 second after an operator stops welding, so the idle consumption of the electric welder is reduced, and the operator can get rid of body shock hazard caused by no load voltage in severe condition places such as double-layer bottom of a ship or high-altitude operation. The arc striking device is applicable to various alternating-current transformer welders, silicon controlled direct-current welders, silicon rectifying welders, alternating-current and direct-current two-purpose welders, carbon gouging machines, arc cutting machines and the like.

The invention discloses a novel electric vehicle driving system. The system comprises a voltage closed-loop PID regulator, a Z-source inverter and a three-phase motor which are connected in sequence, wherein the voltage closed-loop PID regulator is used for increasing the input voltage of the Z-source inverter and controlling the output voltage of the inverter by adding a direct-connection zero vector when the supply voltage of a direct-current voltage source is too low, and the Z-source inverter is used for converting direct current into alternating current required by the three-phase motor. According to the system, a voltage closed loop is additionally arranged in the electric vehicle driving system while a Z-source network is introduced to increase the input voltage of the inverter and control the output voltage of the inverter by adding the direct-connection zero vector when the supply voltage of a storage battery is too low, so that the output performance of a motor driving system is improved. According to the system, the acceleration performance and power performance of an electric vehicle can be effectively improved, the efficiency of the driving system can be improved, and cost is quite low.

The invention provides a wireless charging device for an electric vehicle and an output control method thereof. The wireless charging device comprises a transmitting end and a receiving end, wherein the transmitting end is connected with a work frequency power supply and consists of a work frequency rectifying unit, a power factor correction unit, an inversion unit, a transmitting coil unit, a first communication unit and a first control unit; and the receiving end is connected with a battery system of the electric vehicle and consists of a receiving coil unit, a load compensation unit, a high frequency rectifying and filtering unit, a BOOST transformation unit, a second communication unit and a second control unit. The output control method comprises the following steps of: carrying out power-on and power-off control on the output power by the transmitting end, and carrying out continuous closed-loop control on output voltage or current by the receiving end according to the requirements of a battery system. The transmitting coil unit and the receiving coil unit are mutually coupled to carry out wireless energy transmission, and the first communication unit and the second communication unit are communicated in a wireless way.

The invention discloses an overcharge preventing solar household electric lamp mainly solving the problems that in the prior art, overcharge is likely to happen and a storage battery is damaged when the solar energy is utilized for charging the storage battery. The solar electric lamp comprises a solar battery panel, a photovoltaic controller connected to the solar battery panel, the storage battery connected to the photovoltaic controller, a temperature sensor connected with the storage battery, a single-chip microcomputer connected with the temperature sensor, a storage battery switch connected with the single-chip microcomputer, and an electric lamp body connected with the storage battery. By means of the above scheme, controllable voltage outputting is achieved, the storage battery is protected against overcharge, meanwhile, storage battery damage due to the too high temperature can be prevented, and very high practical value and popularization value are achieved.

The invention discloses an optical module and an optical module LOS optimization method, and the optical module comprises an optical detector which is used for converting an optical signal into an electric signal. The limiting amplifier is provided with an LOS signal pin and is used for outputting a high level or a low level; the APD boost circuit comprises a control interface; the power supply interface is connected with the optical detector; and the output interface outputs a power signal of the optical signal. The MCU comprises a detection pin which is connected with the output interface and is used for receiving the power signal; the input pin is connected with the limiting amplifier and is used for receiving the high level or the low level; the adjusting pin is connected with the control interface, and a power signal monitoring value is set in the MCU; and when the operation judges that the power signal is smaller than the monitoring value, and the input pin receives a high level, the adjusting pin sends a signal to the control interface to supply the output voltage of the interface to rise, or the limiting adjusting pin sends a regulation signal to the limiting adjusting end to reduce the LOS threshold, and the LOS performance of the optical module is optimized.

A control device connected between power switch and output end of a voltage convertor comprises a comparator and a trigger circuit. The comparator comprises a positive input end connected in electricity to a reference voltage, a negative input end in electricity with output end of the voltage convertor and an output end connected in electricity with the power switch and a voltage source; and the trigger circuit comprises a resistance connected in electricity between the reference voltage and positive input end of the comparator and a feedback resistance as well as a feedback capacity connected in series between the positive input end and the output end.

A generator system arranged to respond to a variation in the load with a generous margin regardless of a change in the output of the generator or the engine due to degradation with the passage of time. The output current of the generator is rectified by a converter composed of thyristors in a bridge configuration of which the direct current output is converted by an inverter into an alternating current at a commercial frequency and connected to a load. The engine speed is controlled so that the conduction angle of the thyristors in the converter can be held at a target degree. As the target degree stays within a range smaller than the maximum limit, the generator runs with a margin, thus readily responding to a variation in the load. When the throttle opening is excessively opened, the target conduction angle is decreased to increase a target speed of the engine, hence inhibiting the engine from being overloaded and running at an excessive higher speed.