104 results about "Diode bridge" patented technology

There is provided an electric shaver having (a) a main body that includes a shaver head and a first pair of contacts through which a first voltage is provided, and (b) a cap that is installable on the main body in a first orientation or a second orientation, and when installed on the main body covers the shaver head. The cap has (1) a second pair of contacts that engage the first pair of contacts when the cap is installed on the main body, to receive the first voltage, and (2) a circuit having (i) a diode bridge that receives the first voltage via the second pair of contacts, and provides a second voltage of proper polarity for utilization by other components of the circuit, and (ii) an ultraviolet (UV) light source that utilizes the second voltage, and when ON, emits UV light that irradiates the shaver head.

A power converter (100) for converting multi-phase AC grid input power (GIV, GIC) to DC output power. For allowing efficient, cost-effective, easy installable, and reliable power supply to a DC power consumer with high power requirements, it includes at least one phase block (106A, 106B), each having at least two separate converter single-phase string arrangements (1), each of them including an individual active rectifier portion (10), including a H-bridge with semiconductor switches (12), for rectifying single-phase AC input power (SInV, SInC) to intermediate DC power and an individual DC / DC converter (20). The latter includes an inverter portion (30), having a H-bridge with semiconductor switches (32), for inverting the intermediate DC power to first intermediate AC power (PAC1) with an elevated frequency (f1), a transformer (40, 240) for transforming the first intermediate AC power (PAC1) to second intermediate AC power (PAC2, PAC2A, PAC2B), and a passive diode rectifier (50, 150, 250), including a diode bridge (51), for rectifying the second intermediate AC power (PAC2, PAC2A, PAC2B). The disclosure further discloses a hydrogen production facility (200) with an electrolyzer stack (20) and such a power converter (100).

A three-level power factor rectifier includes a diode bridge arm, a bridge arm assembly, an input inductor, a capacitor bank, and a controller. The first bridge arm includes a first switch, a second switch, a third switch, and a fourth switch connected in series and in sequence. When the controller determines that a loading is less than a load threshold, the controller controls the three-level power factor rectifier entering a burst mode. In the burst sleep period, when a voltage value of an AC power source is greater than a first threshold, the first switch and the second switch are turned off; when the voltage value is less than a second threshold, the third switch and the fourth switch are turned on. When entering the burst period from the burst sleep period, the controller turns on the second switch and the third switch for a specific time period.

The invention discloses a bidirectional power electronic switch, a hybrid DC circuit breaker and a control method. The bidirectional power electronic switch comprises a diode bridge module, a buffer circuit, a voltage limiting circuit and an impedance adjusting circuit. The impedance adjusting circuit is connected in parallel with two ends of the diode bridge module; the buffer circuit is connected in parallel with a breaking electronic switch in the diode bridge module; the voltage limiting circuit is connected in parallel with two ends of the breaking electronic switch; the diode bridge module controls the breaking electronic switch to switch current according to a breaking instruction of the power system; when the breaking electronic switch is locked, the buffer circuit suppresses the voltage and current changes of the breaking electronic switch in the switching process, the voltage limiting circuit limits the overvoltage level of the breaking electronic switch, and the impedance adjusting circuit reduces the oscillation frequency. The impedance adjusting circuit reduces the oscillation frequency, reduces the requirement for the reverse recovery speed of the diode, reduces the stress of the diode bridge type module, and enables a conventional common diode to be not liable to be damaged.

This disclosure presents an embodiment of a power supply device for a submarine data center. One specific embodiment of the power supply device includes a pre-stage voltage regulator / conversion component, a post-stage DC-DC converter component, and a combined protection circuit. The pre-stage voltage regulator / conversion component includes several parallel single-group voltage regulator branches, each branch connected in series with a varistor and a color-coded resistor. A thin-film capacitor is connected in parallel to the output terminal of the pre-stage voltage regulator / conversion component. The post-stage DC-DC converter component, electrically connected to the pre-stage voltage regulator / conversion component, includes at least two sets of full-bridge DC synchronous rectifier circuits. The combined protection circuit includes a pre-stage combined protection circuit, a post-stage active voltage clamping circuit connected in parallel to the output side of the post-stage DC-DC converter component, and a rectifier diode bridge connected between the constant current input port and the pre-stage voltage regulator / conversion component. The pre-stage combined protection circuit is connected in series to the input side of the rectifier diode bridge. By connecting multiple voltage regulator branches in parallel and combining them with the combined protection circuit, ripple is reduced. This embodiment can improve the power supply stability of the power supply device.

The invention relates to an illumination device for illuminating a space exposed to ionising radiation, the device comprising: a power supply circuit having an input for receiving alternating current from a mains electricity grid and an output suitable for delivering a direct current in response to receiving the alternating current, the power supply circuit comprising a diode bridge, and an illumination circuit (50) connected to the output of the power supply circuit, the illumination circuit comprising: a plurality of light-emitting diodes (51) connected in series, a plurality of Zener diodes (52), each connected in parallel with one or more light-emitting diodes of the plurality of light-emitting diodes and at least one resistor (53) connected in series with the plurality of light-emitting diodes, wherein a cumulative nominal supply voltage of the plurality of light-emitting diodes connected in series is adapted to a nominal voltage of the mains electricity grid.

The invention provides an active static var generator in an interleaved parallel form, and relates to the technical field of integrated circuits, and the active static var generator comprises a first three-level topology module which comprises a first three-level topology circuit and a second three-level topology circuit which are connected in parallel between a bus positive electrode and a bus negative electrode, the midpoint of a first switching tube bridge arm of the first three-level topological circuit is coupled with the second end of the first inductor, and the midpoint of a second switching tube bridge arm of the second three-level topological circuit is coupled with the second end of the second inductor. The midpoint of a first diode bridge arm of the first three-level topological circuit and the midpoint of a second diode bridge arm of the second three-level topological circuit are both coupled with the null line connecting end, and the first capacitor is coupled between the first live line connecting end and the second end coupled with the null line connecting end. The first end of the first inductor and the first end of the second inductor are both coupled with the first live wire connecting end, and the problem that the performance is poor in the scene of ultrahigh frequency response, extreme ripple suppression or multi-module flexible expansion is solved.

An electric motor drive device includes: a three-phase diode bridge which rectifies and converts a three-phase AC voltage into a DC voltage; an electrolytic capacitor which smooths a DC voltage; a DC reactor provided between the three-phase diode bridge and the electrolytic capacitor; an inverter which converts a DC voltage smoothed by the electrolytic capacitor into an AC voltage and outputs the AC voltage to a motor; a voltage detecting unit which detects a DC voltage output from the three-phase diode bridge; and an inverter control unit which detects an imbalanced state of the three-phase AC voltage on the basis of a DC voltage value which is a detection value of the DC voltage obtained by the voltage detecting unit, and controls the inverter on the basis of a detection result of the imbalanced state.

Various examples in accordance with the present disclosure provide a stable RF amplitude detector. Some embodiments include a diode bridge circuit comprising a plurality of diodes, wherein at least a portion of the plurality of diodes are biased together and configured to rectify a positive peak of an RF input and a negative peak of the RF input. Some embodiments include a differential amplifier circuit comprising a plurality of differential amplifiers. The differential amplifier circuit may be configured to: (a) compare the positive peak of the RF input rectified by the diode bridge circuit to a positive DC setpoint input, (b) compare the negative peak of the RF input rectified by the diode bridge circuit to a negative DC setpoint input, and (c) output an error value.

The application discloses a current detection circuit, an alternating current load device control system and a detection system. The circuit comprises a first optoelectronic coupler, a diode bridge circuit and a diode series circuit. The first port of the first optoelectronic coupler is connected with the first port of the diode series circuit, and the second port of the first optoelectronic coupler is connected with the second port of the diode series circuit. The first port of the diode bridge circuit is connected with the first port of the diode series circuit, and the second port of the diode bridge circuit is connected with the second port of the diode series circuit. The diode bridge circuit is used for realizing bidirectional flow of alternating current. The diode series circuit is used for collecting the voltage of a device to be detected. The application solves the technical problem that the load working state is only judged by detecting the output end voltage in the prior art, and thus the detection is inaccurate.

The invention provides a diode high-voltage direct-current line offshore wind power transmission system, and belongs to the technical field of power transmission and distribution of power systems, and the system comprises a wind power generation module which comprises a direct-drive permanent magnet synchronous generator, a generator-side converter and a power grid-side converter; the high-voltage direct-current power transmission module comprises a rectifier and an inverter, the rectifier of the high-voltage direct-current power transmission module is a diode bridge, and the inverter is a modular multilevel converter; a generator side converter of the wind power generation module is used for stabilizing DC voltage, and a power grid side converter is used for controlling offshore AC voltage and frequency; the generator side converter adopts a double closed-loop vector control strategy; the power grid side converter adopts an internal control strategy; the inverter adopts a control strategy of an internal control loop and an external control loop. The wind power plant high-voltage direct-current power transmission system can realize maximum power point tracking.

The invention provides a power conversion device which comprises a direct current conversion circuit and a controller, and the direct current conversion circuit comprises a diode bridge arm, a switch tube bridge arm and a clamping capacitor. The diode bridge arm and the switch tube bridge arm are connected in series between the positive direct current bus and the negative direct current bus, and the clamping capacitor is connected between the midpoint of the diode bridge arm and the midpoint of the switch tube bridge arm. The switching period of the DC conversion circuit comprises continuous first to fourth time periods. The controller controls one switching tube in the switching tube bridge arm to be switched on and the other switching tube to be switched off in a first time period; in the second time period, the switching tube bridge arm is controlled to be switched on; in a third time period, one switching tube in the switching tube bridge arm is controlled to be switched off, and the other switching tube is controlled to be switched on; and in the fourth time period, the switching tube bridge arm is controlled to be switched off. The sum of the duration of the first time period and the duration of the third time period is larger than 0 and smaller than 50% of the switching period. And the capacitance value of the clamping capacitor can be effectively reduced.

Reliable device for automatically switching off a cooking appliance when the user is absent from the cooking area for an extended period of time, characterized in that it comprises: 3 ultrasonic sensors (CM), 1 gas flow detector (DG), 1 gas solenoid valve (VE), 1 buzzer (Bz), 1 power relay (19), 5 switching relays (29, 39, 60, 49, 59), 1 microcontroller (6), 1 current transformer (18), 1 diode bridge (16), 1 voltage transformer (17), 1 battery charging circuit (27), 1 12V battery (20), resistors and 2 capacitors (C21, C22), 2 changeover switches (C1, C2), 1 push button (S1) and transistors, etc.). The aforementioned elements work together to automatically shut off the gas supply between the household gas connection (gas cylinder) and the gas oven, and between the 220V mains supply and the electric hob, when the user is absent from the cooking area or in front of their cooking appliance for an extended period of time.

A converter (100, 200) for transferring power from a medium voltage side (MV) to a low voltage side (LV) or vice-versa is provided. The converter (100, 200) comprises an AC / DC converter stage (CS) configured to be connected to a three-phase medium-voltage AC power source (va, vb, vc) at the medium voltage side, the AC / DC converter stage (CS) having three AC input terminals (A, B, C) for the respective AC phases of the medium-voltage AC power source (va, vb, vc), and having a positive voltage output (P) and a negative voltage output (N); a DC link (DCL) comprising at least one first DC / DC converter and at least one second DC / DC converter, wherein input sides of the at least one first and second DC / DC converters (OC1, OC2, OC3, OC4) are connected in series between the positive output (P) and the negative output (N) of the AC / DC converter stage (CS), with a midpoint (M) between the at least one first DC / DC converter (OC1, OC2) and the at least one second DC / DC converter (OC3, OC4); wherein output sides of the at least one first and second DC / DC converters (OC 1, OC2, OC3, OC4) are connected in parallel to provide a low voltage (Vout) to low-voltage output terminals on the low voltage side; three switchable branches (BR1, BR2, BR3), each of the switchable branches (BR1, BR2, BR3) comprising a bi-directional switch circuit between a respective one of the three AC input terminals (A, B, C) and a common star point (S); a regulating circuit comprising either at least one voltage-source-type full-bridge circuit (CL1, CL2) including a DC / DC stage, in particular a DC / DC converter including an isolation transformer, the at least one voltage-source-type full-bridge circuit (CL1, CL2) connected, on its input side, between the star point (S) and the midpoint (M) and, on its output side, to the low-voltage output terminals; or at least one first full-bridge circuit between cathode connections of a diode bridge in the AC / DC converter stage and the positive output (P), and at least one second full-bridge circuit connected between anode connections of the diode bridge and the negative output (N); and a controller configured to control the first and second DC / DC converters, the bi-directional switch circuits, and the regulating circuit such that a current (ipm) between the positive voltage output (P) and the midpoint (M) essentially equals a maximum phase current (imax) of the phase in which the phase voltage at the point in time of performing the control is the highest among the three AC phases, and such that a current (imn) between the midpoint (M) and the negative voltage output (N) essentially equals a minimum phase current (imin) of the phase in which the phase voltage at the point in time of performing the control is the lowest among the three AC phases.

A drive circuit 100 comprises: an oscillation circuit 20 that is connected to a first and a second input terminal 11, 12 into which an input signal is input, and that outputs, in response to the input signal, a first and a second signal which have opposite phases from one another; and an isolated drive circuit 40 that is electrically connected to the oscillation circuit 20. The isolated drive circuit 40 includes a first input end 41 into which the first signal is input, a second input end 42 into which the second signal is input, an isolated circuit 44 which has a first and a second capacitor C1, C2, a diode bridge DB which rectifies a signal input thereto by the isolated circuit 44, a control circuit 44 which is connected to the diode bridge DB, and a first and a second output end 45, 46 which are each connected to the control circuit 44.

The invention provides a multi-port hybrid direct-current circuit breaker and a control method and device thereof. The circuit breaker comprises a through-flow branch, a transfer branch, an energy consumption branch and an isolation branch. A quick mechanical switch is mounted on the through-flow branch; the transfer branch is connected in series with a plurality of one-way on-off sub-modules, and each one-way on-off sub-module is internally provided with a power electronic switch and is provided with a buffer branch; a plurality of groups of first overvoltage protection elements are connected in series and in parallel on the energy consumption branch; the isolation branch is connected in series with a plurality of power electronic devices and is connected in parallel with an energy storage unit. According to the structure, the control strategy is improved, the requirement for the transfer branch is reduced, the transfer branch does not need to have the two-way breaking capacity and only has the one-way breaking capacity, the requirement for removing faults of the circuit breaker under the full working condition can be met, an anti-parallel diode structure or a diode bridge arm module does not need to be arranged, the corresponding cost is saved, and the working efficiency is improved. And the problems of stray inductance increase and the like caused by the increase of commutation paths are also reduced.

A technique for a thyristor converter (100) for transferring power from an alternating current, AC, voltage input to a direct current, DC, voltage output, a method (600) for controlling the 5thyristor converter and a system (500) of thyristor converters is provided. The thyristor converter comprises a thyristor unit (10) that comprises a rectifier with at least two pulses, in particular with six pulses with thyristors, the thyristor unit comprising an input (12), a diode bridge (14) being coupled to the input of the thyristor unit, and a summing snubber unit (16). The summing snubber unit comprises a capacitor (18) being coupled via the diode bridge to the input of the thyristor unit, a resistor (20) being coupled to the capacitor in parallel, and a switching device (22) being coupled to the resistor in series. The thyristor converter further comprises a control unit (24), the control unit being configured to pulsingly activate the switching device in response to a control signal (27).

A method to connect a direct current power (DC) source to a universal alternating current (AC) load can include an energy storage device configured to output a fixed voltage in a range of 84-135 volts (for 120 volt based systems) or 180-264 volts (for a 230 volt based systems). The universal AC load has input comprising a diode bridge followed by a storage capacitor. The unregulated DC source can be connected to the universal AC load by a switch that is turned on (closed) and off (open) with a low-frequency signal (e.g., 90 and 135 Hz) and a duty cycle between 80% and 98%. A sensor and inductor can be added to protect from excessive currents.

An electrical circuit (10, 40) comprising: a direct current power supply (12); an electrical load (14); and an insulation fault detection device (15, 41), arranged in parallel with the load (14), comprising: a voltage divider bridge; a diode bridge (23); and a comparator (34) comparing an output voltage of the diode bridge and a reference voltage (Vcons).

A system is provided that includes a diode bridge for rectifying an AC input voltage. A main switching power converter converts a rectified input voltage of the diode bridge to an output voltage. The flyback converter is coupled to the pre-bridge node or the post-bridge node to receive an input voltage that is converted to a supply voltage for the controller integrated circuit. The controller integrated circuit regulates both the output voltage and the supply voltage.

In accordance with at least on aspect of this disclosure, a system, includes, a DC voltage input configured to provide AC voltage to a load, and a converter operatively connected between the voltage input and the load, configured to convert a DC voltage from the DC voltage input to the AC voltage. In embodiments, the converter can include a first inverter stage operatively connected between the voltage input and a diode bridge, for example, configured to connect one or more intermediate voltage levels to the load. The converter can include a second inverter stage operatively connected between the diode bridge and the load, and an interconnect switching module disposed at the second inverter stage operatively connected to control an output level of the converter at the load.

The present invention provides a broadband passive doubler, comprising: a double-sided microwave circuit board, a first input suspension microstrip line, a second input suspension microstrip line, an input short-circuit line, a diode bridge stack, a first output suspension microstrip line, a second output suspension microstrip line, a first output short-circuit line and a second output short-circuit line; the first input suspension microstrip line and the first output suspension microstrip line are arranged on the front side of the double-sided microwave circuit board and connected to the diode bridge stack; the second input suspension microstrip line and the second output suspension microstrip line are arranged on the reverse side of the double-sided microwave circuit board and connected to the diode bridge stack; the diode bridge stack runs through the double-sided microwave circuit board; the input short-circuit line, the first output short-circuit line and the second output short-circuit line are all connected to the diode bridge stack, so as to better match the input and output suspension strip lines with the diode bridge stack. The broadband passive doubler provided by the present invention has a small size, low frequency multiplication loss and a wide operating frequency bandwidth.

Electrical circuit (10, 40) comprising: a DC power supply (12); an electrical load (14); and an insulation fault detection device (15, 41), arranged in parallel with the load (14), comprising: a voltage divider; a diode bridge (23); and a comparator (34) comparing a voltage at the output of the diode bridge and a setpoint voltage (Vcons). Figure 1

A motor driver device (100) comprises a first diode bridge (10); a first capacitor (3); an inverter (30) which drives a motor (2); a first relay (40) which switches a connection between the first diode bridge (10) and the inverter (30) and a single-phase AC power source (1); an inrush current limiting thermistor (60) which allows an inrush current flow when power is switched on; a second relay (50) which switches a connection between the inrush current limiting thermistor (60) and the single-phase AC power source (1); a second diode bridge (20); a control microcomputer (5); a switching power supply circuit (4) which supplies power to the control microcomputer (5) based on the power supplied by the second diode bridge (20); and a driver-specific microcomputer (7) for the inverter.A half-wave rectifier circuit is configured using diodes contained in the second diode bridge, and a circuit which prevents reverse current flow is configured using other diodes of the second diode bridge.

An ideal diode bridge controller is provided that includes gate drivers to connect to transistors of a bridge rectifier in which the transistors are arranged as high-side transistors and low-side transistors. The gate drivers alternately switch the transistors to cause the bridge rectifier to convert an input voltage of either of two polarities to an output voltage of one of the two polarities. The gate drivers include low-side gate drivers for the low-side transistors, and respective ones of the low-side gate drivers include linear drive circuitry and digital drive circuitry. The linear drive circuitry drives a respective low-side transistor to switch on and off based on forward current through the respective low-side transistor. The digital drive circuitry detects a reverse current through the respective low-side transistor, and causes the respective low-side transistor to switch off in response to the reverse current.

A method to connect a direct current power (DC) source to a universal alternating current (AC) load can include an energy storage device configured to output a fixed voltage in a range of 84-135 volts (for 120 volt based systems) or 180-264 volts (for a 230 volt based systems). The universal AC load has input comprising a diode bridge followed by a storage capacitor. The unregulated DC source can be connected to the universal AC load by a switch that is turned on (closed) and off (open) with a low-frequency signal (e.g., 90 and 135 Hz) and a duty cycle between 80% and 98%. A sensor and inductor can be added to protect from excessive currents.

An isolated SEPIC converter is provided with a power factor correction inductor coupled between an output node of a diode bridge and a terminal of a power switch transistor. When the power switch transistor is cycled off, the power factor correction inductor conducts a demagnetization current through a primary winding of a transformer to charge a bulk capacitor.

To detect a ground fault in the case where a capacitor is connected to an AC system via a current transformer and a rectification circuit.SOLUTION: A ground fault detection circuit comprises: a detection circuit that is provided to an AC system in each phase; and a determination circuit that determines a ground fault of the AC system by the detection circuit. The detection circuit includes: a current transformer that changes a current flowing in one phase line of the AC system; a diode bridge into which the current changed by the current transformer is input; and an output registration that is electrically connected to a first output end of the diode bridge. A second output end of each diode bridge is electrically connected to the output resistance of the detection circuit via a capacitor, and the determination circuit calculates an actual value of the output voltage generated by the output resistance of each detection circuit, and determines the ground fault of the AC system by using a difference of the actual value.SELECTED DRAWING: Figure 1

A method to connect a direct current power (DC) source to a universal alternating current (AC) load can include an energy storage device configured to output a fixed voltage in a range of 84-135 volts (for 120 volt based systems) or 180-264 volts (for a 230 volt based systems). The universal AC load has input comprising a diode bridge followed by a storage capacitor. The unregulated DC source can be connected to the universal AC load by a switch that is turned on (closed) and off (open) with a low-frequency signal (e.g., 90 and 135 Hz) and a duty cycle between 80% and 98%. A sensor and inductor can be added to protect from excessive currents.

A power conversion device (1) comprises a converter (220) with an interleave circuit configuration and a totem-pole type, the converter (220) comprising: three first legs (133a, 133c, 133e) that are legs constituted by switching elements (131a to 131f); a second leg (140) that is constituted by rectifier diodes (141a to 141d); and the same number of reactors (120a, 120c, 120e) as the number of the first legs (133a, 133c, 133e) to be used, the reactors (120a, 120c, 120e) being disposed among an AC power supply (110) and the first legs (133a, 133c, 133e). The first legs (133a, 133c, 133e) are included in an intelligent power module (130) for a three-phase inverter. The second leg (140) is constituted by a two-phase diode bridge module (142), a three-phase diode bridge module, or the rectifier diodes of a discrete component.