179results about How to "Stable power supply voltage" patented technology

The invention discloses a voltage detection and power failure protection device, which is used for keeping the voltage stability of a load. The device comprises a voltage detection module, a voltage stabilization circuit module, an energy storage and power supply module, a control module, a switch module and a power supply switching voltage stabilization module, wherein the switch module comprises a second switch and a third switch; a power supply is connected with one end of each of the second switch, the energy storage and power supply module and the voltage detection module; the other end of the second switch is connected with one end of the voltage stabilization circuit module; the other end of the energy storage and power supply module is connected with one end of the third switch; the other end of each of the voltage stabilization circuit module and the third switch is connected with the load by the power supply switching voltage stabilization module; and the control module is connected with the second switch, the third switch, the voltage detection module and the power supply switching voltage stabilization module. The voltage detection and power failure protection device provided by the invention can keep the power supply voltage stability of the load when the output of the power supply is instable, and may not cause voltage fluctuations of the load, thereby meeting the requirements of a user on the voltage stability of the load.

A front end module having a multilayered structure is provided. The front end module includes a transmitter, a receiver, and a duplex unit. A ground layer is provided with an ground pattern having a plurality of separated blocks on a surface of a substrate of the front end module.

The invention relates to a dc cophase power supply device of a railway traction based on symmetric transformation of three-phase serial voltage sources. The full three-phase input voltages are divided into a plurality of independent lower voltages to form power units, thereby recombined adjusting resource is formed. A single-phase ac output is formed by serial superposition after the rectification-energy storage filter-inversion transformation of each power unit, a negative sequence current is eliminated, the power factor is improved and the harmonic wave is eliminated by using multiple principles of the input and the output. The device can realize the cophase power supply of a railway traction, make fully use of the capacity of the circuit and device, reduce the damage to the power supply system from the reactive current and harmonic wave, decrease the loss, reduce the pollution to the environment, greatly improve the reliability of train and reduce the operation, management and maintenance cost. The device is convenient to apply, and is suitable for requirement of high speed and overloading development.

The invention discloses a set-top box and a switching power supply circuit thereof. The set top box comprises a mainboard circuit and a switching power supply circuit used for providing DC supply voltage to the mainboard circuit, wherein the switching power supply circuit comprises a voltage sampling feedback circuit used for detecting the supply voltage on the mainboard circuit and outputting a feedback signal according to the detected voltage, and a switching power supply feed circuit used for automatically regulating the DC supply voltage output to the mainboard circuit according to the received feedback signal. As the voltage sampling feedback circuit detects the supply voltage on the mainboard circuit, the feedback signal is output to the switching power supply feed circuit and the switching power supply feed circuit automatically regulates the output voltage according to the feedback signal, the stability of the supply voltage on the mainboard circuit is guaranteed.

A semiconductor device is proposed in which signal delay due to compensation capacitance elements in peripheral circuit element regions is eliminated. The semiconductor device includes: a first region including memory cells; a second region 10 including a functional circuit; cell capacitors formed in the first region; and compensation capacitance elements 36 to 38 formed in the second region 10, wherein the compensation capacitance elements 36 to 38 each include a lower electrode 36, a capacitance insulating film 37, and an upper electrode 38, the lower electrode 36, capacitance insulating film 37, and upper electrode 38 being the same as those of the cell capacitors, and wherein the compensation capacitance elements are formed over an upper layer of the second region 10 excluding upper layer portions of drain diffusion layers 44, 46 or gate electrodes 32 of transistors in the functional circuit.

An object of the present invention is to provide an electrode catalyst which is excellent in catalyst performance compared with a conventional electrode catalyst. It is also an object of the present invention to provide an electrode composition for fuel cell and a polymer electrolyte fuel cell using the electrode catalyst. The fuel cell electrode catalyst of the present invention is characterized in that a catalyst component is supported on a carrier having a specific feature.

The invention discloses a high-stability and low-power-consumption on-chip OSC circuit comprising a charge and discharge circuit and a control circuit. As for the charge and discharge circuit, charge and discharge of a capacitor are performed by a current source, and charge and discharge of the capacitor are controlled by a switching tube. As for the control circuit, the level state outputted by the charge and discharge circuit is converted to generate the final output signal of an oscillator, and the output signal of the oscillator controls on/off of the switching tube in the charge and discharge circuit. The circuit is simple in structure and low in power consumption so that the oscillation output function can be realized; as for the current source, current mirroring is performed by a cascode current mirror so that the stability of the generated current I1 and I2 is high, and the oscillation frequency of the OSC circuit is enabled to be stable; and an NMOS transistor M13 is a decoupling capacitor so that the power voltage can be stabilized, the generated current is enabled to be stable, the stability of the oscillation frequency of the OSC circuit can also be enhanced and the noise is low. The comparator and the control part in the prior art are omitted, and a phase inverter, a two-input NOR gate and an RS trigger are adopted so that chip area occupation is small.

Disclosed a conversion device for a quick charger, comprising an input end, a voltage regulator module, a recognition module, a control module and an output end, wherein, the voltage regulator module receives a power voltage through the input end to stabilize a voltage, and outputs the power voltage after voltage stabilization to the recognition module and the control module; the control module reads a conversion voltage of the output end, and produces a conversion signal group according to the conversion voltage to output to the recognition module; and the recognition module produces a handshake signal and a voltage recognition signal according to the conversion signal, and outputs through the input end. Through the device and method, equipment that are not quickly charged may also be charged by the quick charger, so that an application scope of the quick charger is expanded.

A power supply method for an alternating-direct current locomotive upon unpowered conveying is characterized in that a power supply device for an alternating-direct current locomotive is disposed on the locomotive, a locomotive battery is used to provide exciting power for a traction motor through an exciting chopper module of the power supply device, the traction motor enters power generation state to power a locomotive load, and after the traction motor enters the power generation state, the exciting chopper module uses the power generated by the traction motor to continuously provide exciting power for the traction motor. After the traction motor enters the power generation state, the power generated by the traction motor is used to provide exciting power for the traction motor, and itis ensured that in the power generation process, the exciting power is continuously supplied so that the traction motor can generate power continuously and stably; by monitoring, in real time, speed of the traction motor, voltage and current of two ends of a traction motor armature and output current of the exciting chopper module, the magnitude of exciting current output by the exciting chopper module can be adjusted according to monitored values to ensure that power generated by the traction motor has stable voltage.

A lighting fixture for visible light communication is configured to modulate light intensity of a light source (11) comprising a light-emitting device (2) to superpose a communication signal on illumination light. The lighting fixture includes: a power supply circuit (3) configured to control light output of the light source (11) based on a dimming signal; a switch device (Q1) for modulating an output current from the power supply circuit (3) to the light source (11); an impedance element (Rx); a communication circuit (4); and an ON circuit (6). The communication circuit (4) is configured to supply a modulation signal to a side of the switch device (Q1) to superpose the communication signal on the illumination light. The ON circuit (6) is configured to turn on the switch device (Q1) by supply power from the power supply circuit (3) when the communication circuit (4) is inactivated.

The invention discloses card getting self-help service equipment and a card getting method. The equipment comprises an equipment box, an industrial personnel computer, a touch control display, a mass card storage transmission mechanism, a card feeding/discharging transmission mechanism, a first step motor, a connection transmission mechanism, a card cabin, a card taking protection device and a card storing/getting angle regulating device, wherein the industrial personnel computer, the mass card storage transmission mechanism, the card feeding/discharging transmission mechanism, the first step motor, the connection transmission mechanism, the card cabin, the card taking protection device and the card storing/getting angle regulating device are all arranged in the equipment box; the touch control display is arranged on the equipment box; a card discharging opening is formed in the equipment box; the card cabin comprises a plurality of lines of clamp grooves; a plurality of card grooves in each line of clamp grooves are all upwards inclined; an angle being 10 to 30 degrees is formed between the clamp groove and the horizontal surface. The card getting self-help service equipment solves the self-help card getting problem of a user. In the card storing and getting processes, the problems that the card is not stored in the proper position, and the clamping of the card is difficult since the preserved safe distance exists are solved.

The invention provides a transmission noise suppressing structure and a wiring board capable of suppressing a transmission noise transferred through a power supply line, stabilizing a power supply voltage, and reducing signal transmission line cross talk transmitted through the power supply line or a ground layer without being affected by a resistive layer. A transmission noise suppressing structure includes a power supply line and a signal transmission line arranged apart from each other on the same surface; a ground layer arranged apart from the power supply line and the signal transmission line; and a resistive layer arranged apart from the power supply line and the ground layer. The resistive layer has an area (I) which faces the power supply line and an area (II) which does not face the power supply line. The resistive layer and the signal transmission line are apart from each other.

The invention discloses a sliding mode control method of a step-down direct current converter based on an exponential power reaching law. The method comprises the following steps of (1) establishing astep-down direct current converter system model under a time-varying disturbance effect, initializing a system state and a control parameter, and converting into a disturbed model of the step-down direct current converter; (2) designing an unknown input observer to estimate a time-varying disturbance existing in a step-down direct current converter system; and (3) designing a sliding mode controller based on the unknown input observer and the improved exponential power reaching law, and making the step-down direct current converter system output a stable power voltage. By using the control method, composite control of the time-varying disturbance problem in the system is realized, and control precision and anti-interference performance of the system are improved. And compared with ordinary sliding mode control, by using the method of the invention, an output voltage error convergence time speed is fast, and the improved exponential power reaching law has a faster reaching rate and shorter reaching time, and output chattering is restrained.

The invention provides a master-slave type leading load compensation voltage stabilizer which is applied to a circuit of an internal memory buffer; the master-slave type leading load compensation voltage stabilizer comprises a voltage stabilization unit, a master-slave type output stage, a master control unit and an output stage control unit, wherein the voltage stabilization unit is provided with an input end used for receiving reference voltage and feedback voltage, and an output end used for generating regulation voltage; the master-slave type output stage comprises a master output stage and a plurality of slave output stages; the master control unit is used for monitoring the working condition of a circuit load in the internal memory buffer and providing the working information of the circuit load in advance under the condition that the working condition of the circuit load is changed; and the output stage control unit is connected with the master control unit and is used for generating enable signals which respectively correspond to the plurality of slave output stages so as to open and close the plurality of slave output stages according to the working information of the circuit load that is provided in advance, so that the output supply voltage is maintained to be stable. Compared with the prior art, the opening number of the output stages can be controlled in a self-adaptive way according to the working condition of the circuit load, so that the output supply voltage is maintained to be stable, and the performances and the work stability of the circuit load are improved.

The invention relates to a device and method for graphite electric hot plate temperature control. A master controller module is respectively connected with a temperature collecting module, a temperature control module, a key module, a display module, a warning module and a power module. The power module is further connected with the temperature collecting module, the temperature control module, the key module, the display module and the warning module. The temperature collecting module comprises an anti-interference auxiliary circuit which offers stable supply voltage and reference voltage to a temperature measuring signal adjusting amplifying chip. Two power sources are designed for the power module and the power module offers power to the temperature control module and other modules. On the basis of the PWM technology, the sectional type digital PID algorithm and the integral saturation resistant PID algorithm are adopted so that the temperature control over a graphite electric hot plate can be achieved; a relay is prevented from being frequently turned on and turned off according to the sectional type digital PID algorithm, so that the service life of the relay is prolonged; damage caused by integral saturation is overcome through the integral saturation resistant PID algorithm, so that the temperature control balance time is shortened.

The invention discloses an on-load voltage regulation switch special for a power distribution transformer. The switch comprises a stepping motor, a gearbox, a ball screw, a linear guide rail, a time sequence rack, an insulation support, a connection piece, a bolt type needle bearing, a selective switch assembly and a changeover switch assembly. By the on-load voltage regulation switch, the problem that the on-load voltage regulation switch of the power distribution transformer in the prior art is needed to be periodically maintained during achieving on-load voltage regulation is solved, and the problems of complicated switch and high cost of an on-load tap switch in the prior art are simultaneously solved; by integrated connection of a ball nut of the ball screw, the linear guide and the time sequence rack to drive the selective switch assembly and the changeover switch assembly, the structure is simplified, and the cost is reduced; on the basis that the shape and the volume of the power distribution transformer are not changed, frequent voltage adjustment of the power distribution transformer under a load condition is achieved, the power supply voltage is stabilized, and the loss is reduced; and meanwhile, the lifetime cycle of the on-load voltage regulation switch is equivalent to the lifetime cycle of a transformer body of the power distribution transformer, maintenance is not needed within lifetime period of the on-load voltage regulation switch, and the on-load voltage regulation reliability of the power distribution transformer is improved.

An integrated circuit current regulator that compensates for variation in current required based on the switching activity of the integrated circuit. A first embodiment incorporates a voltage controlled on-chip bypass circuit with a scaling unit to divide an input voltage into n fractional voltages and an on-chip voltage monitor to compare a fraction of the on-chip supply voltage with a reference voltage and control a corresponding on-chip power supply bypass. At least one bypass resistor per comparator is switched between the supply voltage and ground potential according to the output signal of the corresponding comparator to dampen power supply noise. The value of the by-pass resistance R increases with decreasing on-chip supply voltage and decreases with increasing supply voltage. A resistance as a function of supply voltage R(Vdd) characteristic is realized to reduce or eliminate mid-frequency power supply noise, caused by on-chip switching activity variations while minimizing additional on-chip power dissipation.

The invention discloses double-layer card-issuing equipment and a card-issuing method. The equipment comprises an equipment box, an industrial control computer, a touch display, a batch card inlet transmission mechanism, a card outlet transmission mechanism, a transit transmission mechanism, a card storage/taking-out angle adjustment device, two card storerooms and two sets of card taking-out protection devices; the touch display is arranged at the front of the equipment box, the batch card inlet transmission mechanism, the card outlet transmission mechanism, the transit transmission mechanism, the card storage/taking-out angle adjustment device, the two card storerooms and the two sets of card taking-out protection devices are all arranged in the equipment box, a card outlet is formed in the position, corresponding to the card outlet transmission mechanism, of the front of the equipment box, the two card storerooms are opposite, each card storeroom comprises multiple rows of card slots, and a plurality of card slots in each row of card slots are all tilted upwards. The double-layer card-issuing equipment is reasonable in structure design, under the condition that the volume of the equipment does not need to be changed, the card storage capacity is obviously increased, and the problems are solved that in the prior art, the card storage capacity is less, and in order to increase the card storage capacity, the volume of the equipment must be increased or the number of equipment must be increased.

The invention discloses a cathode protection data automatic acquisition system based on a wireless sensor network. The system is based on a radio frequency transceiver CC1110, adopts a time division multiplexing working mode, and mainly comprises a solar power supply module, a power circuit, the radio frequency transceiver CC1110, a down link and an up link, wherein the solar power supply module is connected with a radio frequency single chip processor; the input end of the radio frequency single chip processor is connected with a data acquisition module; the output end of the radio frequency single chip processor is connected with an impedance conversion circuit; the output end and the input end of the impedance conversion circuit are respectively connected with the input end and the output end of the first radio frequency switch; the output end of a first radio frequency switch is connected with the down link; the output end of the down link is connected with a second radio frequency switch; the output end of the second radio frequency switch is connected with a transceiver antenna; the other output end is connected with the up link; the up link is connected with the first radio frequency switch; a switch control output end of the radio frequency single chip processor is connected with the first radio frequency switch and the second radio frequency switch. The automatic acquisition system can implement automatic data acquisition, transmission and timed monitoring.