178 results about "Bleeder resistor" patented technology

Improved electro-optic devices are provided which may be in the configuration of variable transmittance windows, variable transmittance eyeglasses, variable transmittance light filters and displays and other devices wherein the transmittance of light therethrough automatically varies as a function of light impinging thereon. The electro-optic devices include a self-erasing electro-optic medium, and the transmittance of light through such medium varies as a function of electrical signals applied thereto through the agency of at least one photovoltaic cell, enclosed within the electro-optic device, and obviating the necessity of providing external drive voltage or external bleeder resistors or external wiring. In addition, a method and apparatus are provided for making such electro-optic devices.

A switching power supply control-circuit according to the present invention uses bleeding resistors to charge a start-up capacitor and discharge an EMI filter. No extra discharge device is needed to accelerate the discharge of the input capacitor, since the start-up capacitor is charged up by the AC input source. A latch circuit of the power supply can be quickly reset after the AC input source is shut off. After the control-circuit begins to operate, the auxiliary winding of the transformer will power the control-circuit. To further reduce power consumption, the auxiliary winding generates a bias voltage to enable line-voltage detection. This allows the power supply to perform line-voltage detection and startup, without having to connect resistors or transistors to the input capacitor.

The invention relates to an automobile insulation resistance detection circuit and method, and the circuit comprises a negative bleeder resistor, a positive bleeder resistor, a first sampling resistor, a second sampling resistor, a third sampling resistor, a fourth sampling resistor, a fifth sampling resistor, a sixth sampling resistor, a negative switch, and a positive switch. One end of the negative bleeder resistor is connected with the negative electrode of a detected battery, and the other end of the negative bleeder resistor is grounded. One end of the positive bleeder resistor is connected with the positive electrode of the detected battery, and the other end is grounded. One end of the first sampling resistor is connected with the negative electrode, and the other end of the sampling resistor is connected with one end of the negative switch. The other end of the negative switch is connected with one end of the second sampling resistor, and the other end of the second sampling resistor is grounded. One end of the third sampling resistor is connected with the positive electrode, and the other end of the third sampling resistor is connected with one end of the positive switch. The other end of the positive switch is connected with one end of the fourth sampling resistor, and the other end of the fourth sampling resistor is grounded. One end of the fifth sampling resistor is connected with the positive electrode, and the other end of the fifth sampling resistor is connected with one end of the sixth sampling resistor. The other end of the sixth sampling resistor is connected with the negative electrode. According to the scheme of the invention, the circuit can improve the detection precision of insulation resistance.

This invention relates to a circuit for speeding up the stabilized low voltage difference linear regulator output voltage based on a circuit composed of an output tube, an error amplifier, a primary standard voltage source, a resistor bleeder network and a load including reference voltage output by said primary voltage source and a feed back voltage output by the network characterizing that said resistor bleeder network is composed of four serial bleeder resistors used in providing three feed back voltages, namely, a first feed back voltage, a second voltage and a third feed back voltage, which utilizes the instant controlled current to speed up the discharge to the grating capacitance of the MPX and the discharge of the output capacitor so as to improve the instant response of LDO greatly.

An exciter system for the field of a synchronous generator excitation is provided. The exciter system includes an AC power source; a three-phase thyristor bridge having six legs, the three-phase bridge being connectable with the AC power source, and being adapted to provide a variable DC voltage output; a thyristor in each of the six legs of the three-phase bridge, wherein the thyristors provide a path for a device current; and a three-phase AC line filter series, including series resistive and capacitive elements across each phase of the AC power source and a plurality of bleed resistors, wherein at least one bleed resistor is connected to each AC input connection of the filter.

In a DC power supply or a battery charger, plural output filter capacitors remain highly charged after the load is removed and the converter is turned off. A transistor connected across the capacitors is non-conductive during normal power supply operation and a bleed resistor connecting the transistor to the output capacitors is not in the circuit during normal power supply operation. When the power supply is turned off and the load is removed, the transistor is automatically rendered conductive with the removal of the pulsed output of the power supply's power transformer to the transistor, with the energy stored in the capacitors safely and quickly discharged to the output return via the bleed resistor which is placed in circuit by the conducting transistor.

Provided is a discharge loop for power supply and the active control circuit thereof for actively regulating the discharging operation of the discharge loop of the power supply. The inventive active control circuit is able to disallow the current to flow through the bleeder resistor of the discharge loop to cause power loss when the input power of the power supply is applying, and provide a fast discharge path for the bleeder resistor to expedite the discharging operation when the input power of the power supply is interrupted. Therefore, the inventive active control circuit is able to reduce the power loss of the power supply and enhance the power efficiency of the power supply.

A head gimbal assembly that includes a bleed resistor applied over a specified area of the reader, writer and ground leads in order to protect from ESD damage is disclosed. The present invention address the need for an ESD protection system that includes a consistent and secure connection with leads, that does not contaminate the drive environment and applies a consistent resistivity to both the reader and writer element by providing a head gimbal assembly with strategically placed bleed resistors that will protect the read element from transient charge produced any time during the fabrication, assembly, testing and shipment of the disc drive.

The invention discloses a direct-current side control method for a midline arm control model of a four bridge arm photovoltaic inverter. The midline arm control model comprises a photovoltaic direct-current input, a stabilized voltage capacitor, a direct-current booster circuit, two groups of inverter side storage capacitors, two equivalent bleeder resistors connected in series, a midline inductor and a midline arm. The invention discloses a direct-current side midpoint balance control method and a controller design method suitable for the midline arm control mode., wherein an average value of signals in a switching period of a midline arm switching function is used as a control variable; an H-infinity controller is designed by adopting an H-infinity control method; and the H infinite norm of the input midline current, measurement error, equivalent external disturbance, half of the sum of the output voltages of the two capacitors relative to a neutral point and midline arm midpoint voltage is minimum; and the invention provides implementation of a corresponding generalized controlled object, a controller structure and a corresponding weighting function selection method. The method can ensure that the stability of the direct-current side midpoint of the four bridge arm photovoltaic inverter still can be kept in high midline current.

A device for protecting superconducting magnet quench comprises a superconducting magnet and a quench protection circuit. When the device protects passive heating of the superconducting magnet, the superconducting magnet (2) composed of a plurality of superconducting coils (1) is divided into n segments, n being not smaller than 1. Each segment includes one or a plurality of superconducting coils (1). Each segment is parallelly connected with serially connected devices such as an electrifiable spring (3), a variable resistor (4), a quench trigger heater (5), a piecewise resistor (6) and a bidirectional protection diode (7). The whole superconducting magnet (2) is connected with a power supply (8) in parallel. When the device protect energy bleeding of the superconducting magnet, the quench protection circuit further comprises a bleeder resistor (14); after sequentially connected in series, an electrifiable spring (12), a variable resistor (13), the bleeder (14) and a bidirectional protection diode (15) are parallelly connected to two ends of the superconducting magnet.

The present invention provides a power apparatus, which includes a switch unit, a bleeder resistor, a filter, a rectifier, a power factor corrector, an output capacitor, a rectifying diode, a surge absorber, a main power supply, and a standby power supply. Moreover, the AC power charges to the output capacitor by means of the rectifying diode and the surge arrester, such that the standby power supply generates a standby power while the switch unit is off. Furthermore, the AC power charges to the output capacitor through the switch unit, the bleeder resistor, the filter, the rectifier and the power factor corrector, such that the main power supply generates a main power while the switch unit is on. The present invention further provides a method of supplying power.

The invention provides an active bleeder circuit of a motor controller for an electric car and a control method thereof. The active bleeder circuit has the advantages of high reliability, safe and high space utilization rate and the active bleeder circuit is convenient for maintenance. The active bleeder circuit comprises a motor controller and a support capacitor of the motor controller, wherein a negative terminal of the support capacitor is in a ground connection. The capacitor is in parallel connection with a series circuit formed by series connection of a first resistor and a second resistor, wherein the contact point of the first resistor and the second resistor is connected with a control terminal of a bleeder switch. A positive terminal of the support capacitor is connected with a current input terminal of the bleeder switch by a bleeder resistor, wherein a current output terminal of the bleeder switch is connected with a negative terminal of the support capacitor. The motor controller possesses a first signal output pin, wherein the first signal output pin is connected with a control terminal of a control switch by a first isolation drive circuit, and an output signal output terminal of the control switch is connected with the control terminal of the bleeder switch.

A method of making a piezoelectric fan includes using a portion of the fan blade material as the substrate for the electronic circuit. By this method a single material may serve as both the substrate for the electronic circuitry and as the fanning end of the fan blade. Flex circuitry, including elements such as bleed resistors, inductors, capacitors, DC to AC conversion, shielding, or even drive circuitry, may be used. The piezoelectric material used to power the fan blade may have a Curie temperature high enough to survive reflow soldering, thus allowing the fan to be surface mountable on an electronic device. The fan may include an interconnect to facilitate connecting the piezoelectric material to the electronic circuit of the fan, and to facilitate connecting the electronic circuit of the fan to the electrical system of an electronic device. The interconnect may also facilitate mechanically mounting the fan.

The invention discloses two variable resistor Crowbar structures for the low-voltage ride-through of wind power generation and a method for realizing the variable resistor Crowbar structures. A parallel Crowbar structure comprises two or more than two Crowbars which are connected in parallel and have the very same structure. In a chopped Crowbar structure, two or more than two controllable devices are connected in parallel with an output loop of an uncontrolled bridge, wherein at least one controllable device is connected in series with a bleeder resistor. The method comprises the following steps of: detecting a three-phase grid voltage, a three-phase rotor current and a direct current bus voltage; converting the three-phase grid voltage and the three-phase rotor current to obtain a grid voltage and a rotor current under a two-phase stationary coordinate system, and computing amplitude values of the grid voltage and the rotor current; and by input of the amplitude values of the grid voltage and the rotor current and the direct current bus voltage, and by using a parallel Crowbar structure algorithm or a chopped Crowbar structure algorithm of the variable resistor Crowbar structures with corresponding structures, acquiring control signals of the Crowbars to control the on and off of the controllable devices of the Crowbars respectively.

The invention relates to the technical field of fuel cells, and especially relates to a fuel cell system bleeder circuit based on two-stage protection. The circuit comprises a fuel cell stack, a fuelcell boost DCDC module, a finished automobile high-voltage power distribution box PDU and a bleeding heater, the fuel cell boost DCDC module comprises a DCDC boost circuit, a DCDC input side main relay K2 and a DCDC output side main relay K5, the output end of the fuel cell stack is connected with the DCDC boost circuit through the K2; the DCDC boost circuit is connected with the input end of thefinished automobile high-voltage power distribution box PDU through the K5, the fuel cell boost DCDC module comprises a discharge relay K3 and a PTC power supply relay K7, the output end of the fuel cell stack is connected with the input end of the bleeding heater through the K3, and the K5 is connected with the input end of the bleading heater through the K7. A traditional bleeder resistor is omitted, a load PTC heater is directly utilized, and the boost DCDC space and cost are saved. And meanwhile, the requirement for rapid bleeding can be met, and the emergency shutdown time of a fuel cellsystem is saved.

An arm of a coating robot is used to prevent external leakage of a high voltage. A tank is installed on a robotic arm and contains water as an actuating liquid. The water is supplied to a paint cartridge by a pump controlled by a controller. The water sent from the pump under pressure is supplied to the paint cartridge by a conduit tube. A high voltage generator and a bleeder resistor are combined with the tank such that a high voltage generated by the high voltage generator is supplied to the electrostatic paint applicator via the water. For replenishment of water to the tank is attained by relatively connecting a nozzle in communication with a water source to a main pipe. While the high voltage generator generates a high voltage, the nozzle and the main pipe are kept disconnected to maintain electrical insulation between the nozzle and the main pipe.

The invention discloses a T-type three-level converter power module double-pulse test circuit and a test method, comprising: a T-type three-level converter power module; two ends of a DC source connected in parallel with a discharge resistor and a bus capacitor; the bus capacitor It consists of two series-connected DC support capacitors, and the connection of the two series-connected DC support capacitors is connected to one end of two IGBT tubes with different directions; the first DC support capacitor and the two ends of the first DC support capacitor are connected in parallel with the first absorption capacitor and the second absorbing capacitor; a DC source switch is set at the positive end of the DC source, and a discharge branch switch is set at the positive end of the bleeder resistor. The air core inductor is connected to both ends of the first IGBT tube or the fourth IGBT tube. This test method can test various commutation conditions of the power module, device switching time, overvoltage absorption effect of the absorbing circuit and drive short-circuit protection, and provides an effective test method for the development of T-type three-level converters .

The invention discloses an energy storage tram control system. The energy storage tram control system comprises a hydrogen-producing fuel cell, a super-capacitor and a bleeder resistor which is used for bleeding the super-capacitor when the super-capacitor is over-voltage, wherein the hydrogen-producing fuel cell is connected with the super-capacitor through a direct current chopper; the super-capacitor is connected with a traction motor of a vehicle through an inverter; the direct current chopper and the inverter are both connected with a controller; and the controller is used for controlling the super-capacitor to provide power to the traction motor and controlling the super-capacitor to absorb braking energy of the traction motor. As the energy storage tram control system disclosed by the invention drives the traction motor through the super-capacitor, the vehicle can obtain good acceleration performance, the bleeder resistor can be used for bleeding the super-capacitor when the super-capacitor is over-voltage, and the controller can feed back and absorb the braking energy in each vehicle braking process; therefore, the energy utilization efficiency is increased and energy is saved. The invention further discloses a tram including the energy storage tram control system.

The invention discloses a floating grid modulator. As a leakage inductance peak adsorption unit is arranged between an isolating transformer and a pulse shaping driver module, the floating grid modulator can adsorb a leakage inductance peak in an output signal of the isolating transformer so as to avoid using a low-leakage inductance transformer with relatively complex preparation process, large volume and high cost; therefore, the cost and volume of the floating grid modulator can be conveniently reduced. An extra capacitor does not need to be connected with the outside of a main switch, and a large-resistance bleeder resistor R9 is combined with an inherent distributed capacitor in the main switch to maintain the conduction level of the main switch, so that the volume of the floating grid modulator is reduced. Signal driving is realized by using a driver IR2110, and the common conduction time of the main switch and a truncated switch tube is reduced by using the time delay characteristic of the device, so the circuit loss is reduced and the efficiency is improved.

The present invention discloses an insulation detection device with integrated multiple functions. The device comprises: a main controller, a power circuit, a high-voltage switching unit, an insulation detection circuit, a voltage and current sampling circuit, a metering chip, a built-in bleeder resistor, a bleeder control circuit, a LCD / LED display, a clock circuit, an EEPROM, a key, a battery circuit, a 485 communication circuit and a CAN communication circuit. A direct current bus between a charging module and a main relay of a charging pile and a PE line are accessed into the high-voltageswitching unit, and insulation state detection is performed by the insulation detection circuit; and the direct current bus of the charging pile after outputting the main relay is accessed into the voltage and current sampling circuit, and electric energy metering, battery voltage measurement and charging current measurement can be performed by employing the metering chip. The device provided by the invention can solve the problems that the internal structure of the charging pile is complex and the cost is high, so that the circuit integrates a direct current metering function, a bleeder function, a battery voltage detection function and an insulation detection function, and a battery optimization performance is completed.

The invention discloses an active control current-limiting system for fault current and a control method thereof. The active control current-limiting system comprises series DVR modules, DC-links and a parallel converter, wherein a series side is formed by a three-single-phase structure; each phase comprises an L, a C1 filter link, a series transformer T, one DVR module and one DC-link; an each DC-link comprises a current-limiting inductor L1, a bleeder resistor rf, a D5 and a bidirectional thyristor T3. LC filters are used for filtering out harmonic waves, and the input time of the bleeder resistors is controlled through regulating the duty ratios of controlled tubes T2, so that current is limited below a specific value. Stabilized capacitors C are connected between the three-single-phase series side and the PWM parallel converter in parallel; and the PWM parallel converter is formed by a three-phase full bridge. Improvement of the voltage quality of a power network system, governance of harmonic current and a short-circuit fault current limiting function can be achieved and the electric security is improved.

The invention relates to a soft start simulation method for a modular multi-level converter and belongs to the technical field of flexible power transmission and distribution of power systems and power electronics. An equivalent circuit of a modular multi-level converter is established at first, bridge arm equivalent modules replace MMC converter valve bridge arms of the multi-level converter, each bridge arm is equivalent to an equivalent module formed by connecting two serially connected diodes, a capacitor, a bleeder resistor and a controlled current source in parallel, the parameters of all elements in the bridge arm equivalent modules are set to enable the equivalent circuit model to have the same external properties as a detailed model, and the soft start process of the equivalent circuit of the configured modular multi-level converter is simulated. As the equivalent circuit is adopted to simulate the soft start process of the converter, the time required for simulating the soft start process of the converter is greatly shortened and the engineering design efficiency of the soft start resistor is improved.

The invention discloses a flexible direct current transmission system and a direct current fault processing method thereof. The system comprises ABC three-phase converter valves, wherein the converter valve of each phase is divided into an upper bridge arm and a lower bridge arm, and the upper bridge arm and the lower bridge arm are both respectively cascaded by a plurality of sub-modules; one side of a power transmission system formed by the ABC three-phase converter valves is connected to an alternating current network, and the other side of the power transmission system is connected to a direct current overhead line; a bleeder resistor R is connected between the power transmission system and the DC overhead line; through adding the bleeder resistor R and controlling the bleeder resistor to put into the system before a direct current breaker is opened, after the direct current breaker is opened, the resistance lasts for some time, and after the fault current is reduced to be lower than an overcurrent threshold value, the direct current bleeder resistor R is disconnected; the method provides an access to a circuit, and the current cannot flow into a capacitor through a diode. The system is simple in structure and the method is simple and effective, and a problem that a direct current fault processing process is easy to cause overvoltage of the capacitor voltage and diode overcurrent can be solved.

The invention discloses a power-off control method based on a full-power electricity-electricity hybrid fuel cell vehicle. The power-off control method comprises a normal shutdown power-off process, a safety fault power-off process and a self-fault emergency power-off process. The normal shutdown power-off process comprises the following steps that S1, a normal power-off instruction of the whole vehicle is identified; S2, whether an FCS shutdown instruction is issued or not is judged according to the SOC of the power battery; S3, a fuel cell system begins to reduce the load to idle speed power; S4, the fuel cell system is shut down for purging; S5, a step-up DCDC is safely discharged, and a machine is shut down after the residual electric quantity of the fuel cell is completely consumed; S6, discharging is conducted again through a bleeder resistor; S7, whether shutdown of the fuel cell system is completed or not is judged; S8, a hydrogen bottle valve is closed, and high-voltage discharge power-off is executed; and S9, low-voltage power-off is executed. According to the method, power-off is divided into three modes, power-off logic under different scene working conditions is realized, and the situation that the service life of the fuel cell system is affected due to the fact that the fuel cell system is damaged due to unreasonable logic is avoided.

The invention discloses a thin-film capacitor integrating EMC and discharge functions and a motor controller thereof. The thin-film capacitor comprises a capacitor shell with a top seal and a bottom opening, and a heat dissipation upper cover and a water cooling bottom plate which are arranged at the upper and lower ends of the capacitor shell. A heat conduction insulation pad, a laminated busbarand an X capacitor core roll are sequentially arranged in the capacitor shell from bottom to top. The laminated busbar is provided with an EMC module comprising a Y capacitor, a bleeder resistor and aPCB, the capacitor shell is filled with an epoxy packaging adhesive to package the X capacitor core roll and the EMC module, and the surface of the capacitor shell is provided with a magnetic ring for an input terminal of the laminated busbar to pass through. When the thin-film capacitor is installed in the motor controller shell, the top and the bottom of the thin-film capacitor are both provided with cooling designs, and the water channel heat dissipation surface of the motor controller shell and the air cooling heat dissipation surface of the controller upper cover can be used for double-surface cooling at the same time.

The invention discloses a supply apparatus and a power supply method. The supply apparatus comprises a switching unit, a bleeder resistor, a filter, a rectifier, a power factor corrector, an output capacitor, a rectifying diode, a surge absorber element, a main power supply unit and a standby power supply unit, wherein when the switching unit is switched off, AC (alternating current) mains electricity is used for charging the output capacitor by the rectifying diode and the surge absorber element so as to supply for the standby power supply unit and then the standby power supply unit generates a standby power supply; and when the switching unit is switched on, the AC mains electricity is used for charging the output capacitor by the switching unit, the bleeder resistor, the filter, the rectifier and the power factor corrector so as to supply for the main power supply unit and then the main power supply unit generates a main power supply. The supply apparatus can restrain surge currents effectively, reduce the standby power consumption and meet the energy-saving requirement.

The invention relates to a low-power consumption feedback circuit for a control chip of an AC-DC switching power supply. The feedback circuit comprises a resistor divider; a current limiting resistor for controlling the output current of the feedback end of the chip is connected in the resistor divider in series; a parallel branch consisting of a bleeder resistor and a bleeder switch which are connected in series is arranged on the current limiting resistor; the bleeder switch is controlled by a comparator; and a comparison signal is obtained from comparing a resonant signal with a reference voltage. In the invention, the resistance of the current limiting resistor is increased to reduce the output current of the feedback end of the control chip in an idle state, so as to reduce no-load loss. The resonant detection signal is skillfully multiplexed to indirectly detect an output voltage VO so as to cause the feedback end of the control chip to bleed when the VO shoots down, thereby preventing the response speed reduction of the control chip, which is caused by only increasing the current limiting resistor. By using the invention,the problem of large idle loss of the power is solved,and the feedback circuit has the advantages of simple circuit structure and low cost and is convneient to be integrated.