2766 results about "Voltage reduction" patented technology

A high output level is maintained in power supplies having multiple cells in each leg. Failed cells in any leg are bypassed to provide a current path through the respective leg. All of the unfailed cells are utilized while maintaining equal magnitude between phases and a balance phase relationship in the line-to-line output voltage. The invention may be utilized in conjunction with a peak voltage reduction circuit, and a by-pass switch.

A system, device, and method of providing information for a power distribution system is provided. In one embodiment, a method of using a device that receives power from the low voltage power of the power distribution system and experiences a power loss during a local power outage may perform the processes of monitoring a voltage of the low voltage power line, detecting a voltage reduction below a threshold voltage for a predetermined time period, storing information of the voltage reduction in a non-volatile memory prior to the power outage, and transmitting a notification to a remote computer system prior to the outage. The monitoring may comprise making a plurality of measurements of the voltage during a time interval and averaging the plurality of voltage measurements. In addition, the method may include transmitting an alert message upon power up after the outage to indicate a power restoration local to the device.

In an LCD pixel, the pixel voltage is usually reduced after a gate line signal has passed. To compensate for this voltage reduction, the voltage applied to the charge storage capacitor in the pixel is increased from Vcom to Vcom1 after the gate line signal has passed. Voltage adjustment can be achieved by using two switching elements connected to the second end of the charge storage capacitor. One is activated by the gate line signal so that the applied voltage is equal to Vcom, and the other is activated by the next gate line signal so that the applied is increased to Vcom1. In a transflective LCD panel or a color LCD panel, each pixel is divided into two or three sub-pixels, each sub-pixel having a separate charge storage capacitor, a similar Vcom change is applied to each of the charge storage capacitors in the pixel.

An electrical circuit for providing electrical power for use in powering electronic devices, such as monitors, televisions, white goods, data centers, and telecom circuit boards, is described herein. The electrical circuit includes a voltage reduction circuit and a rectifier circuit for delivering input power signal to the voltage reduction circuit. The voltage reduction circuit is configured to receive an input power signal and generate an output power signal at a lower voltage level. The rectifier circuit includes a full wave bridge rectifier coupled to the electrical power source, a Zener based charging circuit coupled to the full wave bridge rectifier, a voltage divider coupled to the Zener based charging circuit and the full wave bridge rectifier, and an output terminal coupled to the full wave bridge rectifier, the Zener based charging circuit, and the voltage divider for delivering the input power signal to the voltage reduction circuit.

An electrical circuit for providing electrical power for use in powering electronic devices, such as monitors, televisions, white goods, data centers, and telecom circuit boards, is described herein. The electrical circuit includes a voltage reduction circuit cell that includes a first capacitor, a second capacitor, a switching circuit, and a hold capacitor. The switching circuit includes a plurality of switching devices that are coupled to the first and the second capacitors for delivering power from an input terminal to an output terminal. The plurality of switching devices includes at least two switching devices that are coupled to ground. The voltage reduction circuit cell also includes a controller for operating the switching circuit in a plurality of operational modes to deliver an output power signal at a desired voltage level.

The invention discloses a rapid charging method and system for a portable power source. A communication recognition module is connected to a power adaptor or terminal electronic equipment for recognizing whether to support a large-current charging mode, an input mode control module and an output mode control module are connected with the communication recognition module simultaneously, and a charging input mode or a charging output mode is selected according to a recognition result of the communication recognition module, so that the portable power source is charged or the portable power source is used for charging the terminal electronic equipment. According to the method and the system, the input and output current can be intelligently selected and controlled, and 2-5A large current can be supplied to increase the charging speed and shorten the charging time; when the electronic equipment is charged, the voltage-reduction scheme is adopted to improve the charging efficiency; a monitoring confirmation module is additionally arranged, thus well ensuring the charging safety and preventing safety risk.

The invention discloses a switching apparatus of a UPS power supply. The apparatus comprises a commercial power supply module, an external power supply module, a cell power supply module, a cell charging module, a MCU control module, a switching control module and a host power supply output module. According to the apparatus of the invention, the MCU control module is used to monitor working states of the commercial power supply module, the external power supply module, the cell power supply module and the cell charging module in real time and synchronously carry out power-down waveform identification and peak value voltage detection. When the commercial power supply is performed, the host power supply output module is controlled to carry out voltage reduction on the commercial power so that the commercial power is converted into a reference power supply and is output. When the MCU control module determines that the commercial power is off through the power-down waveform identification and the peak value voltage detection, a switching instruction is output to the switching control module so that the switching among the commercial power supply module, the external power supply module and the cell power supply module is realized. Alternating current power down can be accurately identified in a short time and a switching signal is provided timely. A UPS multipath priority switching requirement is reached.

The invention discloses a method and a device for charging a battery. The method comprises the following steps: when a battery module is charged with constant current or constant voltage, detecting the temperature of each buttery cell in the battery module; when the temperature of any one of the battery cells is over a threshold, reducing the charging current, wherein the threshold is not higher than the critical temperature requiring charging voltage reduction prescriptive in a safety specification; and after a period of time, judging whether the temperature of the buttery has a downtrend, if the temperature of the battery has a downtrend, maintaining the charging current, and if the temperature of the battery has no downtrend, reducing the charging current continuously. According to the steps, the battery can be charged under the condition of taking account of security consideration and no loss of battery capacity.

Provided is an apparatus and method for providing a voltage reduction for single-phase voltage regulator operation in a three-phase power system. The voltage regulator includes a plurality of tap positions selectable to adjust a voltage at a load to an in-band area. The method includes determining a measured voltage and current at the voltage regulator, determining a line voltage drop between the voltage regulator and the load if the measured voltage in the OOB area above the in-band area, and utilizing the measured voltage to lower the voltage at the load if there are no available taps. The method also includes utilizing the measured voltage less the line voltage drop to determine the tap change if there are available taps.

A switching voltage regulator and slope compensation method thereof are provided. The switching voltage regulator comprises an inductor coupled to a load; a pulse width modulation (PWM) unit comprising an output stage and generating a PWM driving signal to control the output stage, such that the inductor delivers an inductor current signal to the load; and a slope compensation unit outputting a slope compensation signal with a compensation slope proportional to a falling slope of the inductor current signal to the PWM unit according to the inductor current signal. The invention can perform excellent boosting, voltage reduction, and voltage transformation for the power supply.

The invention provides power-down retaining circuit and method and a power supply system. The circuit comprises an energy storage capacitor, a voltage reduction circuit and a voltage booster circuit, wherein the first input end and the second input end of the voltage reduction circuit are respectively connected with the anode and the canoed of an input power supply, the first output end and the second output end of the voltage reduction circuit are respectively connected with the anode and the canoed of the energy storage capacitor for reducing the input voltage of the input power supply when the input power supply is normal, the energy storage capacitor is charged by the output of the voltage reduction circuit, the first input end and the second input end of the voltage booster circuit are respectively connected with the anode and the canoed of the energy storage capacitor for boosting the energy storage voltage of the energy storage capacitor when the input power supply is powered down, and the energy storage capacitor is used for finishing a charging process by the reduced input voltage when the input power supply is normal and is also used for supplying power to an output load by the boosted energy storage voltage when the input power supply is powered down. The embodiment of the invention realizes a long period of power-down protection time when a low voltage is input.

Current source converter drives and common mode voltage reduction techniques are presented in which a space vector modulation zero vector for current source inverter (or rectifier) control is selected according to the switching state of the current source rectifier (or inverter) and according to the AC input power and the AC output power to control the output common mode voltage.

A de-icing, snow melting and warming system is taught which utilizes a heatsink (20) consisting of a number of board strips disposed in a planer array positioned within a building structure between its exterior and interior surface. The heatsink board strips have a gap (24) therebetween in which a heating cable (42) is positioned in a continuous serpentine manner and held in place with loop clamps (44). A gap filler (48) encases the heating cable including the enclosed gap forming a homogenous closure. A low voltage power transformer (54) is attached to electrical mains providing electrical voltage reduction to the heating cable of 30 volts or less, and controls and self diagnostics regulate the power and detect anomalies within the system.

The invention relates to an overvoltage and undervoltage protecting device which comprises an alternating current power interface, a voltage reduction transformer, a rectification filter circuit, a first sample circuit, a second sample circuit, a voltage reference circuit, an upper-limit voltage comparator, a lower-limit voltage comparator, an or circuit and a protection circuit; the alternating current power interface is connected to two ends of power equipment; a first junction of the alternating current power interface is connected with an input terminal of the rectification filter circuit through the voltage reduction transformer; the other input terminal of the rectification filter circuit is connected with a second junction of the alternating current power interface; when an input voltage accessing to the alternating current power interface excesses a normal scope, an output terminal of the voltage reference circuit is in short connected with the second junction of the alternating current power interface by the protection circuit in order that an overcurrent protector connected between an alternating current input and the power equipment trips off to cut off the connection between the alternating current input and the power equipment. The overvoltage and undervoltage protecting device of the invention can carry out overvoltage and undervoltage protection to the power equipment, effectively protect the equipment and prolong the life-span of the power equipment.

The invention relates to a lead and aluminum compound anode plate material and the preparing method, which belongs to the field of electrolysis technology. The invention adopts purified aluminum plate or aluminum alloy plate, purified lead or lead and silver alloy and copper electric conducting beam as raw materials. The invention later adopts acid corrosion operation to the purified aluminum plate or the aluminum alloy plate so as to remove an oxide film. And then the surface of the aluminum plate is plated with a layer of other metals such as Ag, Mg, Sr, Zn or Sn, and the processed purified aluminum plate or aluminum alloy is placed into a mould so as to be evenly poured with a purified lead or lead and silver alloy fluid to make out the lead and aluminum compound cathode plate blank. Finally, the lead and aluminum compound cathode plate blank is milled into the lead and aluminum compound cathode plate. The lead and aluminum compound anode plate has the advantages of fine electric conduction, possible groove voltage reduction, electric energy conservation and high intensity of the compound anode plate as well as impossible deformation.

An electrical circuit for providing electrical power for use in powering electronic devices, such as monitors, televisions, white goods, data centers, and telecom circuit boards, is described herein. The electrical circuit includes a voltage reduction circuit cell that includes a first capacitor, a second capacitor, a switching circuit, and a hold capacitor. The switching circuit includes a plurality of switching devices that are coupled to the first and the second capacitors for delivering power from an input terminal to an output terminal. The plurality of switching devices includes at least two switching devices that are coupled to ground. The voltage reduction circuit cell also includes a controller for operating the switching circuit in a plurality of operational modes to deliver an output power signal at a desired voltage level.

The invention discloses a hybrid rail grinding wagon, which is applied to operation of hybrid rail grinding trains in the field of large-sized track engineering. The hybrid rail grinding wagon comprises an internal-combustion engine driven power car, an electrically driven power car and more than one trailer, wherein a grinding device is mounted on each trailer. When the hybrid rail grinding wagon is operated in a power accessible area or tunnel area, power is taken from a contact system through a pantograph of the electrically driven power car, subjected to voltage reduction with a transformer, and subjected to rectification and inversion with an inverter to generate three-phase variable-frequency variable-voltage alternating current, which is supplied as power required by a tractor motor and the grinding devices. The hybrid rail grinding wagon switches to the internal-combustion engine and generator combined mode in the power inaccessible area, so that power required by travelling and the grinding devices of the hybrid rail grinding wagon is supplied. The technical problem that existing grinding wagons are low in operation and combustion efficiency, severe in emission pollution and high in use and maintenance cost is solved, and the hybrid rail grinding wagon can achieve full-section seamless operation in the power accessible or in accessible area and the tunnel area.

The invention discloses a circuit and a system for intelligent management of a battery pack. The circuit for intelligent management of the battery pack comprises more than two battery units, wherein battery units are connected in series, one pole of each of the battery units is electrically connected with one output port of a voltage-reduction and voltage-stabilizing circuit and one pole of a redundant battery unit through a third switch and a first switch sequentially, the third switch and the first switch are in series connection, and the other pole of each of the battery units is electrically connected with the other output port of the voltage-reduction and voltage-stabilizing circuit and the other pole of the redundant battery unit through a second switch. The system for intelligent management of the battery pack comprises the circuit for intelligent management of the battery pack. What's more, the first switch, the second switch and the third switch are controllable switches and are controlled by one control unit. By the aid of the circuit and the system, the effective management of the battery pack can be achieved, and particularly, the smooth switching balance and the efficient floating charging balance can be achieved.

Apparatus, devices, and methods for providing a voltage reduction capability in a welding power source for safety purposes. The resistive load and the output voltage of the welding power source output are monitored and compared to predefined or preselected threshold values to generate a load condition signal and an output voltage condition signal (e.g., logic signals). The load condition signal and the output voltage condition signal serve as inputs to a voltage reduction device control logic which generates control signals to enable and disable the input and output of the welding power source according to the defined control logic. As a result, an extra measure of safety in preventing electrical shock is provided to users of the welding power source during hazardous operating conditions.

The present invention relates to an LED lamp and a drive circuit thereof, wherein, the drive circuit comprises a rectifying unit, a voltage reduction unit, constant-current drive unit and an emergency unit. In the emergency unit, the base electrode of a triode is connected with the output of the voltage reduction unit through a first divider resistance while the emitter of the triode is grounded;a second divider resistance is connected between the base electrode and the emitter of the triode; the collector electrode of the triode is connected with the grid electrode of an MOS tube; the source electrode of the MOS tube is connected with the output of an emergency power supply while the drain electrode is connected with the power input of the constant-current drive unit; a pull-up resistoris connected between the grid electrode and the source electrode of the MOS tube; and the positive electrode of a blocking diode is connected with the output of the voltage reduction unit while the negative electrode is connected with the power input of the constant-current drive unit. The present invention can guarantee that the constant-current drive unit can output current for driving LEDs to work and light normally even though alternate current fails.

The invention relates to a light-dimmer driving circuit. The light-dimmer driving circuit comprises a power supply input module, a transformer, a current output driving module, a pulse width modulation (PWM) module, an input voltage sampling module, an output voltage sampling module and a control center, wherein the power supply input module is mainly used for rectification and filtering of an input voltage signal, the transformer is used for voltage reduction of the voltage signal output by the power supply input module, the current output driving module is used for driving of current output according to the voltage signal which is transformed, the PWM module is used for adjusting output power of the current output driving module according to a control signal in the control center, the input voltage sampling module is used for sampling of the input voltage signal and transmitting the input voltage signal to the control center, the output voltage sampling module is used for sampling of output voltage and transmitting the output voltage to the control center, and the control center is used for controlling a PWM signal according to an input voltage sampling signal, an output voltage sampling signal and an input current signal. According to the light-dimmer driving circuit, due to the fact that the control center is used for controlling the PWM signal according to the input voltage sampling signal, the output voltage sampling signal and the input current signal, the output power of the current output driving module is enabled to change evenly, flicker-free light adjusting is achieved, constant current output is achieved, and range of the light adjusting is wide.