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833 results about "Rectifier diodes" patented technology

A rectifier is an electrical device composed of one or more diodes that converts alternating current (AC) to direct current (DC). A diode is like a one-way valve that allows an electrical current to flow in only one direction. This process is called rectification. A rectifier can take the shape...

LED retrofit lamp with shunt capacitors across rectifier diodes for use with a ballast

The invention relates to LED replacement lamp suitable for operation with a high frequency fluorescent lamp ballast, comprising—a LED load (LS) comprising a series arrangement of LEDs,—a first lamp end circuit comprising—a first lamp pin (LP1) and a second lamp pin (LP2) for connection to a first lamp connection terminal comprised in the high frequency fluorescent lamp ballast,—a first rectifier (D1-D4; D1,D2) equipped with at least one input terminal coupled to the second lamp pin and with first and second output terminals coupled to respective ends of the LED load, the first rectifier comprising at least two diodes, one of which is shunted by a first capacitor (C1),—a second lamp end circuit comprising—a third lamp pin (LP3) and a fourth lamp pin (LP4) for connection to a second lamp connection terminal comprised in the high frequency fluorescent lamp ballast,—a second rectifier (D5-D8, D5, D6) equipped with at least one input terminal coupled to the fourth lamp pin and with first and second output terminals coupled to respective ends of the LED load, the second rectifier comprising at least two diodes, one of which is shunted by a second capacitor (C2), wherein the first capacitor and the second capacitor form a series arrangement coupled between the second lamp pin and the fourth lamp pin.
Owner:SIGNIFY HLDG BV

Single-circuit output flyback converter controlled in current mode

The invention relates to a single-circuit output flyback converter controlled in a current mode. The single-circuit output flyback converter comprises an alternating current input source, wherein the alternating current input source inputs direct current to a first buffer circuit through an input filter capacitor after passing through a rectifier bridge circuit; the first buffer circuit is connected in parallel to a primary winding of a transformer, the primary winding is connected with the drain electrode of a switching tube, and a secondary winding is respectively connected with an output rectifier diode and the input end of a first absorption circuit and is connected to a control chip through a chip power supply circuit; the output end of the output rectifier diode is connected to a three-terminal voltage-stabilizing circuit through an output filter capacitor after being connected in parallel with the output end of the first absorption circuit; a second buffer circuit is connected in parallel between the source electrode and the drain electrode of the switching tube, and the grid electrode and the source electrode are respectively connected with the control chip through a sampling resistor; the compensation end of the control chip is connected with the output end of an isolating circuit, the input end of the insolating circuit is connected in parallel with the output filter capacitor, and the other input end of the isolating circuit is connected with the three-terminal voltage-stabilizing circuit which outputs voltage-stabilizing direct current; and a second absorption circuit is arranged in the three-terminal voltage-stabilizing circuit.
Owner:BEIJING STATE GRID PURUI EXTRA HIGH VOLTAGE POWER TRANSMISSION TECH CO LTD

Temperature Compensation Circuit of Rectifier Diode in Flyback Converter

The invention discloses a rectifier diode temperature compensation circuit in a flyback converter, which mainly solves the problem that as the temperature rises, the forward voltage drop of the secondary side rectifier diode of the primary side feedback flyback converter is decreased to cause the increase of the output voltage of the flyback converter. The circuit comprises a temperature monitoring module, a temperature compensation module and an overtemperature protection module; the temperature monitoring module monitors the change of temperature, and respectively outputs two routes of current changing along with the temperature to the temperature compensation module and the overtemperature protection module; the temperature compensation module adds the generated compensation value intothe feedback voltage of the flyback converter, and outputs the compensated feedback voltage; and the overtemperature protection module carries out overtemperature protection by way of current comparison. The circuit not only can compensate the change of the forward voltage drop of the secondary side rectifier diode of the flyback converter as the temperature changes, but also can provide overtemperature protection for the flyback converter, moreover, the circuit structure is simple, and the circuit can be used in the designs of AC/DC (alternating current-to-direct current) conversion controller chips adopting the primary side feedback control technology.
Owner:XIDIAN UNIV

Induction excitation type mixed excitation brushless synchronous motor

The invention relates to an induction excitation type mixed excitation brushless synchronous motor which structurally comprises a stator and a rotor. The stator comprises a stator core, an armature stator winding and a stator excitation winding, wherein the armature stator winding and the stator excitation winding are arranged in a stator groove. The rotor comprises a rotor core, permanent magnets, a plurality of rotor excitation windings, rectifier diodes and a rotary shaft, wherein the plurality of rotor excitation windings are independent from one another and short-circuited through the diodes respectively. The permanent magnets are arranged on the rotor, and the number of the permanent magnets can be determined as various forms according to an excitation requirement. When direct current is led into the stator excitation winding, constant magnetic fields are built in air gaps. When the rotary shaft rotates at the synchronous speed, excitation current of pulse vibration is inducted on the rotor windings, the size of air gap magnetic fields is changed, and output voltage of the motor is controlled by changing current intensity in the stator excitation winding. The induction excitation type mixed excitation brushless synchronous motor has the advantage of being free of brush slip ring, requiring no exciters, being simple in structure and achieving brushless excitation of the rotor excitation mixed excitation motor.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Active clamping forward-flyback converter

The invention discloses an active clamping forward-flyback converter, which is provided with a primary side clamping resonant circuit comprising a series branch consisting of a clamping switching tube and a primary side clamping capacitor, wherein the series branch is connected with an original-level winding of the primary side of an isolation transformer in parallel or is connected in serial between a start end of the original-level winding of the primary side of the isolation transformer and a negative terminal of a direct current power supply; and a contravariant switching tube works in a ZVS state, and a secondary rectification circuit is one of a forward-flyback working rectification loop and a flyback working rectification loop. The active clamping forward-flyback converter can enter two different operation modes to achieve a large adjustment range of input and output voltages, reduce reverse steady-state voltages and reverse recovery resonance voltage spikes of a primary side switching tube and a secondary rectifier diode and the voltage stress and the switching loss of the primary side switching tube, and improve the efficiency. The active clamping forward-flyback converter is particularly suitable to be widely applied in the occasions with a very wide input voltage fluctuation range and a wide and high output voltage, in which semiconductors cannot withstand high voltages.
Owner:SANTAK ELECTRONICS SHENZHEN

Super-wide output voltage range charger based on LLC topology and control method

ActiveCN104467443AAchieve zero voltage turn-onReduce turn-on lossDc-dc conversionMobile unit charging stationsMOSFETNew energy
The invention discloses a super-wide output voltage range charger based on LLC topology and a control method. The super-wide output voltage range charger comprises an LLC resonant converter and a control circuit. The LLC resonant converter comprises a switch network composed of an MOSFET full-bridge conversion circuit, the input end of the switch network is connected with the input end of a power source, the output end of the switch network is connected with the input end of a resonant network, the output end of the resonant network is connected with a leakage inductor of a transformer, and a secondary side coil of the transformer is connected with a rectifying and filtering network; the control circuit comprises a control unit, the control unit controls MOS tubes of the MOSFET full-bridge conversion circuit to be connected or disconnected according to received signals at the input end and the output end of the LLC resonant converter, and therefore the LLC resonant converter can achieve no-voltage connection of a primary side switch tube and no-current disconnection of a secondary side rectifying diode within a full voltage range. The super-wide output voltage range charger is wide in output voltage, free of limitation of the input voltage range of a charged object and capable of charging various new energy electric vehicles.
Owner:SHANDONG LUNENG SOFTWARE TECH

Totem-pole bridgeless power factor correction circuit

The invention discloses a totem-pole bridgeless power factor correction circuit which comprises a switching tube series branch and a rectifier diode series branch, and also comprises two series diodes and two parallel diodes, wherein the switching tube series branch is provided with a first switching tube and a second switching tube, the rectifier diode series branch is provided with a first rectifier diode and a second rectifier diode, the two series diodes are respectively serially connected between the first switching tube and a negative busbar and between the second switching tube and a positive busbar, the two parallel diodes are respectively connected in parallel between a common terminal of the first switching tube and the positive busbar and between the common terminal of the second switching tube and the negative busbar, wherein reverse recovery time of the parallel diodes corresponding to the first switching tube is less than that of the first switching tube, and reverse recovery time of the parallel diodes corresponding to the second switching tube is less than that of the second switching tube. Because reverse recovery characteristics of the parallel diodes are better, a reverse recovery current is smaller without damaging the totem-pole bridgeless power factor correction (PFC) circuit working in a CCM (Coincident-Current Memory) mode.
Owner:EMERSON NETWORK POWER ENERGY SYST NORTH AMERICA

Sectional type switch reluctance motor

The invention discloses a sectional type switch reluctance motor, belonging to the field of magnetic circuit components. The sectional type switch reluctance motor comprises a main shaft, at least two sections of stators, at least two sections of rotors and magnetic isolating plates arranged on the main shaft, wherein each section of the stators and each section of the rotors are respectively provided with magnetic isolating plates, and each section of the stators and each section of the rotors are uniformly distributed around 360 degrees in the axial direction respectively. Stator poles of each phase of each section of the stators are respectively connected in series and are connected with a one-way guide circuit; the one-way guide circuit comprises four rectifier diodes, energy storage capacitors, main control thyristor switches and guide thyristor switches which are connected in series two by two; series circuits of each stator pole are mutually connected in parallel; one ends of the series circuits are respectively connected with the main control thyristor switches and guide thyristor switches; and the middles of two series circuits of the rectifier diodes are respectively connected with two output ends of the alternative current. By utilizing the sectional type switch reluctance motor, output torque pulse can be effectively reduced, and by guiding the induced current among the sections, the energy consumption efficiency of a system is improved, the impact of the induced current to the components is reduced, and the service life of the system is prolonged.
Owner:费赛恩流体技术(合肥)有限公司
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