32 results about "Trigger transformer" patented technology

This invention relates to a synchronous rectifier for LLC resonant converter. This method allows simple drive method for the synchronous rectifier MOSFETS by using the transformer secondary winding voltage and one-shot vibrator. The synchronous rectifier MOSFETs are turned on by being triggered to the transformer secondary side winding voltage and turned off after predetermined time set by one shot vibrator. The predetermined time is set by the resonant period of the resonant network.

The invention discloses a power transformer winding fault simulation test method and belongs to the field of power transformer winding fault simulation test. The method comprises the following steps that: the high-voltage side of a universal power transformer is connected with an alternating current power supply through a voltage regulator, a resistor for limiting magnetizing rush current is connected in series between the voltage regulator and an electric switch; a bypass switch is connected in parallel at two ends of the resistor; the low-voltage side of the universal power transformer is connected with the low-voltage side of a tested power transformer provided with a winding fault; the high-voltage side of the tested power transformer is in short circuit; the voltage regulator is regulated, so that the tested power transformer acquires different required testing current; and a vibration signal on the surface of an oil tank of the tested transformer is acquired through a vibration sensor, and a current signal which reflects load of the tested transformer is measured through a current sensor so as to be processed and analyzed by a computer. The requirement of the power transformer winding fault simulation test on the power capacity is reduced, the method is easy in operation and readily available in parameters and has universality on similar transformers.

Lasers capable of lasing at at least two wavelengths are provided having a lasing medium which is capable of lasing at a first wavelength and at a second wavelength. An output coupler is positioned along a longitudinal axis at a first end of the lasing medium and a first mirror, movable beam block shutter and second mirror are positioned sequentially along the longitudinal axis of the lasing medium at a second end of the lasing medium. The first mirror is highly reflective at a first wavelength, and the second mirror is highly reflective at a second wavelength while being transparent at the first wavelength. The beam block shutter is movable between a first position along the longitudinal axis of the lasing medium and between the first and second mirrors and a second position away from the longitudinal axis of the lasing medium. Also provided are laser workstations having two lasers driven by a single electronics drive system in which a single energy storage network is connected to a first laser pump chamber operative to excite a first laser medium and connected to a second laser pump chamber operative to excite a second laser medium. In certain embodiments, a switch connects the single energy storage network to a secondary winding of a high voltage trigger transformer, which is itself connected to the laser pump chambers. These high voltage trigger transformer serve to selectively ionize the excitation source in one of the laser pump chambers such that when the switch is closed, energy from the energy storage network will flow through the pump chamber whose excitation source(s) has been previously ionized. In other embodiments, the single energy storage network is connected to the excitation sources via active semiconductor switches that permit the release of portions of energy stored in the single energy storage network to one of the lasers, leaving additional energy to be immediately or rapidly released to the excitation source of the first or another laser. Also provided are methods of treating skin having a skin problem using multiple wavelengths of laser energy.

The invention, which belongs to the electric switch field, discloses a trigger energy saving apparatus and a thyristor switch, and especially a trigger energy saving apparatus applied in a thyristor switch trigger loop triggered by a transformer and the thyristor switch which comprises the trigger energy saving apparatus. In the invention, the trigger energy saving apparatus triggers the thyristor to be conducted only under a condition that voltage values across two ends of a thyristor are greater than the value of a thyristor conduction voltage drop. A thyristor trigger control signal is immediately closed after the thyristor conducts so that energy consumption of triggering signals can be substantially reduced, temperature rise of a control circuit can be reduced and reliability of the control circuit can be raised. In the thyristor switch comprising the trigger energy saving apparatus, because of the low energy consumption of the thyristor trigger drive, a pulse signal frequency and pulse signal duty cycle of the trigger transformer can be raised, or rectification is performed on an output signal of the trigger transformer and capacitive stored energy is given to a thyristor control terminal through the trigger energy saving apparatus. The thyristor switch possesses the following advantages of low trigger energy consumption, good conduction linearity, little harmonic wave amount and high reliability.

The invention relates to the field of transformer temperature rise tests, in particular to a temperature rise test method for a for large transformer. According to the temperature rise test method for the large transformer, a temperature rise test is conducted on a product to be tested by connecting a power-frequency power generation set, a reactive compensation capacitor, an intermediate transformer, a temporary intermediate transformer, a standard-voltage transformer for a power analyzer, a standard-current transformer for the power analyzer, a standard-voltage transformer for monitoring, a sleeve type current transformer for monitoring, an effective voltmeter for monitoring, an ampere meter for monitoring and the power analyzer to the product to be tested after the power-frequency power generation set, the reactive compensation capacitor, the intermediate transformer, the temporary intermediate transformer, the standard-voltage transformer for the power analyzer, the standard-current transformer for the power analyzer, the standard-voltage transformer for monitoring, the sleeve type current transformer for monitoring, the effective voltmeter for monitoring, the ampere meter for monitoring and the power analyzer are connected according to a certain sequence, or directly connecting the power-frequency power generation set, the reactive compensation capacitor, the intermediate transformer, the temporary intermediate transformer, the standard-voltage transformer for the power analyzer, the standard-current transformer for the power analyzer, the standard-voltage transformer for monitoring, the sleeve type current transformer for monitoring, the effective voltmeter for monitoring, the ampere meter for monitoring and the power analyzer to the product to be tested. According to the temperature rise test method for the large transformer, the structure of a test circuit is simple, operation is easy, the accuracy degree is high, and the method is suitable for the test items such as load tests or temperature rise tests of low-voltage and large-capacity power transformers with voltages equal to or higher than 20kV-35kV and capacities equal to or higher than 50000 KVA, and low-voltage and large-capacity special transformers.

The invention discloses a transformer bushing dielectric loss live detection method and system based on transient voltage disturbance. The method comprises the steps of collecting and obtaining electromagnetic transient voltage signals generated by a system connected with a to-be-tested transformer; processing the collected electromagnetic transient voltage signals and obtaining effective electromagnetic transient voltage signal data in a preset frequency range; collecting and obtaining a transformer bushing leakage current when transient voltage disturbance occurs; and computing bushing insulation dissipation factors under different frequencies through utilization of the obtained effective electromagnetic transient voltage signal data and leakage current, thereby finishing bushing dielectric loss live detection of the to-be-tested transformer. According to the method and the system, the transient voltage signals at a position of a guide rod of a transformer bushing inlet is collectedand the transient voltage signals are taken as excitation sources of a transformer bushing insulation dielectric response test, so the live detection of an insulation state of a bushing can be realized, and manpower and time cost when conventional uncharged detection of the insulation state is carried out can be reduced.

This invention relates to harmonic vibration test facilities of partial discharge detection of dry-type transformer. This invention includes three-phase power source of 380V 50Hz, frequency conversion power source, intermedial transformer, high voltage filter, high voltage measure equipment, compensator, sampling device of partial discharge signal, measure equipment of partial discharge. Compared with existing technique, this invention has enough experiment capacity. And the invention is easy to carry.

To prevent a transformer such as a trigger transformer from becoming unable to perform transformation as designed due to short circuits caused by leakage of an insulating wax or the like even when the temperature of the transformer becomes high, a sealed chamber is formed in an outer bobbin which accommodates a secondary winding by a sealing member and the sealed chamber is filled with an insulating wax.

The invention discloses a hand basin with an automatic adjustment drainer. The hand basin with the automatic adjustment drainer structurally comprises a hanging plate and a hanging basin body. The hand basin with the automatic adjustment drainer has the beneficial effects the amount of water in the hanging basin body is sensed through a pressing plate, so that a transformer and a hydraulic press are triggered to work through water pressure, then a supporting rod is pushed to ascend, when the supporting rod ascends, a blade and a baffle are driven to rotationally ascend, and the blade cuts up hair entering a sewer pipe in a rotating process, so that the hair is prevented from blocking the sewer pipe, meanwhile, the water in the hand basin can be prevented from overflowing and wetting clothes, sewage diversion does not need to be manually carried out as well, and the pressing plate is pressed manually, so that the transformer is driven to drive the hydraulic press to work, the hanging basin body can be manually adjusted under the condition of insufficient water pressure, flow guiding of a small amount of sewage is completed, the condition that the baffle is automatically opened due to the fact that water flow impacts the pressing plate is avoided, the hanging basin is more convenient to use, and the hanging basin body can be preferably assisted to be used through the drainer.

The invention relates to an ultraviolet flash xenon lamp integration module special for an analytical instrument, comprising a flash xenon lamp, a driving power supply and a control circuit. The ultraviolet flash xenon lamp integration module is characterized in that the flash xenon lamp and the driving power supply thereof and the control circuit are integrated into a small-sized module; an imported Hamamatsu flash xenon lamp L4646 is adopted as the flash xenon lamp and has the advantages of high accuracy, good stability, and the like; parts, i.e. an SG3524 power supply chip, a high-frequency transformer, and the like, are adopted as the circuit part of the high-voltage driving power supply and have feedback design so as to ensure that power supply output ripples are less than 0.05 percent; and an imported trigger transformer ZS1052AC of a PerkinElmer company is adopted as a high-voltage trigger circuit and has good trigger accuracy consistency so as to ensure the accuracy of the flash intensity of the flash xenon lamp. The invention has the advantages of small size, long service life, high precision, adjustable internal light intensity and internal/external trigger functions, can be integrated into the analytical instrument and meet the requirements of the analytical instrument (in particular an on-line monitoring instrument) on an ultraviolet light source and is suitable for the ultraviolet flash xenon lamps of various analytical instruments.

The invention relates to a novel shock wave trigger circuit, including a trigger transformer, a power transformer, a bridge rectifier, a silicon controlled rectifier, a photoelectric coupler, a resistor, a capacitor, a silicon controlled rectifier and a diode, etc. In the part, the trigger pulse signal controls the conduction of the thyristor through the photocoupler to generate a trigger high voltage. Compared with the prior art, the beneficial effect of the present invention lies in that the trigger transformer is controlled by a silicon controlled rectifier to generate a trigger high voltage, the trigger pulse is stable and reliable, there is no leakage or burst, the circuit is simple, the trigger is stable, and it is used for extracorporeal shock wave breaking stone machine.

The invention discloses a simplified controllable rectifying device, comprising a full-bridge rectifier, a controllable silicon and a resistance, wherein the input end of the full-bridge rectifier isconnected with an external power supply, one output end thereof is grounded, and the other output end thereof is serially connected with the controllable silicon, and then the two output ends are respectively connected with two ends of the resistance. The simplified controllable rectifying device has simple structure and only adopts one piece of the controllable silicon, the triggering is simple,and a triggered transformer is simplified.

The invention relates to a high voltage lead angle error influence testing device and a testing method thereof. The device comprises a voltage regulator, a test transformer, a standard transformer, an equipotential shielded capacitor voltage transformer (CVT) test sample and a high voltage lead, wherein the primary side of the test transformer is connected with the voltage regulator, one end of the secondary side is grounded, and the other end of the secondary side is connected with one end of a current limiting resistor R; the other end of the current limiting resistor R is respectively connected with the primary side of the standard voltage transformer and the primary side of the equipotential shielded capacitor voltage transformer test sample; the secondary side of the standard voltage transformer and the secondary side of the equipotential shielded capacitor voltage transformer test sample are both connected with a transformer calibrator; and an angle is formed between the high voltage lead and the axis of the equipotential shielded capacitor voltage transformer test sample. Conditions of different high voltage lead connection modes can be simulated successfully, the accuracy of the CVT in the conditions is verified to still achieve requirements of a high-precision accuracy grade, and in the above conditions, the generated error changes are smaller than those of a CVT with a traditional structure.

The invention discloses a thyristor triggering system based on an isolated power supply and a method thereof. The thyristor triggering system based on the isolated power supply comprises at least onetriggering circuit, the triggering circuit comprises a power supply end Vin+ and a power supply end Vin-, an isolation power supply 1, a high-speed optocoupler 1 and a thyristor 1, the power supply end Vin+ and the power supply end Vin- are electrically connected with the input end of the isolation power supply 1 independently, and the isolation power supply 1 comprises an output end V1+ and an output end V1- which are isolated. According to the thyristor triggering system based on the isolated power supply and the method thereof, the isolated power supply and the high-speed optocoupler are used for replacing a triggering transformer, the size is smaller, and the cost is lower; and the continuous current triggering mode can be rapidly conducted during current reversing, and the pulse arraymode can be conducted only after a pulse low-level time; and the control logic is simpler and can be realized by one common GPIO port.

The invention relates to a bi-stable three phases AC relay that belongs to basic electric component especially relay. The technology problem is to supply a bi-stable three phases AC relay that is small volume and contact credibility. It is made up of control circuit, coil assembly, magnetic steel assembly, contact system and basic crust. Its feature is that the control circuit adopts striking transformer, silicon controlled rectifier, thick film integration module constituted by resistances that is embedded in the one end of the base crust next to coil assembly and the two ends of the relay coil is separately connected to the neutral line and phase conductor of AC power supply, driving rod that is set in the middle of the three couple main contacts and connected to the keyway of the containing body of magnetic steel assembly. The invention is suited for bi-stable three phases AC relay.