34 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.

Lasers capable of lasing 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 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 rigid solid state modulation switch module and a combinational circuit thereof. The switch module comprises a trigger transformer and at least two switching device assemblies, wherein the trigger transformer is provided with at least two secondary windings; each switching device assembly comprises an electronic switching circuit, a solid state switching device, a static state voltage equalizing circuit and a dynamic state voltage equalizing circuit, the two input ends of the electronic switching circuit are respectively connected with both ends of the corresponding secondary winding, the high-voltage end of the two output ends of the electronic switching circuit is connected with a grid electrode of the solid state switching device, the low-voltage end of the two output ends of the electronic switching circuit is connected with a source electrode of the solid state switching device, both the static state voltage equalizing circuit and the dynamic state voltage equalizing circuit are connected between the source electrode and a drain electrode of the solid switching device in parallel, and the electronic switching circuit is used for forming positive and negative pulse trigger signals which flow through the first stage of the trigger transformer into trigger pulse of the solid state switching device. The invention further discloses the combinational circuit formed in a way that a plurality of the modules are connected in series or in parallel or the plurality of the modules are connected in series and in parallel.

The invention discloses a novel magnetic shielding air-core transformer coupling bridge type solid state fault current limiter. The fault current limiter comprises an air-core transformer provided with a high temperature superconducting magnetic shielding barrel or winding, a rectifier bridge circuit and a direct current inductor. Compared with fault current limiters in prior art, the fault current limiter has the advantages that the size is small, the structure is compact, during a normal operation, due to a magnetic shielding effect of the superconducting magnetic shielding barrel, the impedance is extremely low, the influence of the impedance on a system can be completely ignored, when a fault happens, an automatic response is achieved, a high current-limiting impedance is inserted to limit the current rapidly, restoring time is short, and the improvement of system dynamic stability is facilitated.

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. The novel shock wave trigger circuit comprises a trigger transformer, a power transformer, a bridge rectifier, a silicon controlled rectifier, a photoelectric coupler, a resistor, a capacitor, a silicon controlled rectifier, a diode and the like, wherein the photoelectric coupler isolates a trigger signal from a post-stage high-voltage part, and a trigger pulse signal controls the silicon controlled rectifier to be conducted through the photoelectric coupler, so that trigger high voltage is generated. Compared with the prior art, the novel shock wave trigger circuit has the beneficial effects that the silicon controlled rectifier is adopted for controlling the trigger transformer, then trigger high voltage is generated, the trigger pulse is stable and reliable, no trigger leakage occurs, no continuous trigger occurs, a circuit is simple, the trigger is stable, and the novel shock wave trigger circuit is used for an in-vitro shock wave lithotripter.

The present invention provides a ballast capable of eliminating lighting failures and reducing insulation resistance, and a projector equipped with the ballast. The ballast has a trigger transformer (4), and a trigger transformer drive circuit (5) that supplies an excitation current to the primary coil of the trigger transformer (4) at the start of lighting, and the trigger transformer (4) supplies the high-pressure discharge lamp The electrode (73) (base end electrode) and electrode (75) (front end electrode) of (7) apply the opposite voltage of polarity, and, make the absolute value of the voltage applied on the electrode (75) be greater than that applied to the electrode (73) ) the absolute value of the voltage on.

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 present invention belongs to the technical field of electrical control, and relates to a discharge control circuit of a pulse apparatus and particularly relates to a silicon bidirectional switch (SBS)-based self-triggered discharge control circuit. The circuit is based on an SBS. Partial pressures of a resistor R1 and a resistor R2 are set through a turning voltage of the silicon bidirectional switch. When the voltage of the resistor R2 reaches the turning voltage of the silicon bidirectional switch, Q1 of the silicon bidirectional switch is connected instantly, the silicon bidirectional switch triggers Q2 to be connected, a primary level of a trigger transformer T1 is triggered, a secondary level senses a corresponding pulse, a thyristor Q3 is triggered to be connected, and then discharge output is completed. The circuit can realize self-triggered discharge without using a control signal of a front end circuit. The SBS (silicon bidirectional switch) is combined with controllable silicon, and a certain value of resistor and capacitor are configured, so that the self-triggered discharge circuit is formed. The SBS-based self-triggered discharge control circuit can adjust energy storage voltage accurately, uses a semiconductor part, and has a long service life, high reliability, and high anti-interference capability. The present invention provides a novel discharge control circuit for the pulse apparatus.

The invention discloses a high radiofrequency spark protector. The high radiofrequency spark protector comprises a spark protector body, wherein the spark protector body comprises a spark protection trigger circuit, the spark protection trigger circuit comprises a low voltage transformer, a low voltage rectification module, a trigger transformer, a high voltage transformer, a high voltage rectification module and a triode module. The high radiofrequency spark protector is simple to install, adopts a complete sealed structure for the spark protector body, enhances durability, and can be normally used in places under harsh environment. The spark protection trigger circuit in the high radiofrequency spark protector not only is simple in structure, but also is high in sensitivity, and prolongsprotection time, and if an upper mold plate and a lower mold plate directly communicate with each other and a spark phenomenon occurs when high radiofrequency is used for processing a belt, the highradiofrequency spark protector can enable an oscillating electronic tube to stop oscillating and cut off a main power source at the moment of striking sparks, protects a mold and a conveying belt, andreduces loss to the minimum.

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.