187results about How to "Reduce the voltage value" patented technology

The present invention relates to a semiconductor memory with a volatile memory device, in particular a DRAM memory device, and with a non-volatile memory device. The volatile memory device is electrically coupled with the non-volatile memory device, and the non-volatile memory device has a polymer memory device adapted to be switched between two states of information.

A reader for an RFID system includes an internal power source, a signal generator for generating a detection signal containing analog data and an excitation signal, a transmitting antenna for transmitting the detection and excitation signals, and a receiving antenna for receiving a transponder data signal from a transponder containing digital data. Receiver electronics are coupled with the receiving antenna for conditioning the transponder data signal before reading the digital data. The reader further includes a single-chip microcontroller coupled with the internal power source and the receiver electronics. The single-chip microcontroller has an analog to digital converter to measure the declining power level of the internal power source and to acquire the analog data from the detection signal and the digital data from the transponder data signal. The single-chip microcontroller also includes a firmware and/or software-based demodulator for demodulating the transponder data signal to read the digital data.

A surface light source control device has a plane light source control circuit for setting a current amount to a plurality of diode arrays. The light source control circuit comprises a constant current circuit for holding currents respectively flowing in the plurality of diode arrays constant at the same current value; and a power supply voltage control loop for selecting a notable diode array with a minimum reference voltage, among reference voltages appearing at each terminal of the plurality of diode arrays, appeared thereon to select the minimum reference voltage by a voltage selection circuit and adjusting a common power supply voltage so that the reference voltage becomes a prescribed value.

The invention provides a lithium battery pack charging method. According to the lithium battery pack charging method, the diversity of single cells is gradually reduced by adopting four stages of a constant-current pre-charging mode, a constant-current equalizing charging mode, a constant-voltage current-reducing charging mode, and a constant-current trickle charging mode. The relatively poor single cell can be relatively fully charged, and the relatively good cell can be discharged in an equalizing manner by controlling the charging time and charging current of the single cell with a relatively poor performance so as to achieve the effect that the diversity of the single cells is well reduced. The cells can be recovered to a certain degree by stopping charging for a period of time in the constant voltage charging mode, the voltage of the relatively-high-voltage single cell is reduced to a certain degree, so that the charging time can be prolonged for the relatively low voltage cell, and finally the cell is charged with trickle with the minimum charging current. This period of the charging time is prolonged so that the relatively low voltage cell keeps to be changed for a long time. In the whole charging process, the diversity of the single cells is reduced by prolonging the charging time so as to achieve the effect that the cells are relatively fully charged, and the service life of a battery pack is relatively long.

The invention provides a driving method for an electro-optical apparatus, the electro-optical apparatus, and electronic equipment in which unevenness of luminance in the vertical direction can be controlled. A data signal is written to pixels in a first sub field SF1 and a non-data signal, having the same polarity as the data signal, and of the maximum voltage is written to the pixels in a second sub field SF2 in each frame. When proceeding from SF1 to SF2, variations in potential applied to each signal line can be decreased, and the amount of leakage of each pixel electrode potential is reduced. After having obtained a black display (in the case of a normally white mode) by writing the non-data signal, a data signal having the opposite polarity from the data signal in the previous frame is written to the pixels. Since a black display is in the stable area of a V-T curve of the liquid crystal, and variations in transmittance ratio can be small even when the voltage is varied to some extent, variations in transmittance rate of the liquid crystal at the each pixel, that is, unevenness of luminance when proceeding from the SF2 to the subsequent frame SF1 is small.

The invention provides a linear LED driving circuit used a score divider for adjusting voltage. The circuit includes a power circuit composed of a rectifying unit, an LED module and a current controller, and a serial-parallel score divider connected to the LED module and a voltage dividing controller connected to the serial-parallel score divider. The serial-parallel score divider includes a voltage dividing capacitor connected to the LED module in series. When discharging, the voltage dividing capacitor is connected between at least one LED unit and a grounding terminal of the LED module. Since voltage across the voltage dividing capacitor is equal to that across two ends of the LED unit, voltage value of the voltage dividing capacitor can be decided by controlling quantity of the LED units connected to the current controller in series. Input voltage can be reduced to an arbitrary score voltage dividing value suitable for LED quantity, so that the circuit can be suitable for different voltages.

The invention relates to an electric heat mat controller, which adopts the conductive resistor whose resistance value changes followed by the temperature as a heating wire for a temperature controller. Therefore, the invention can regulate the resistance value in direct proportion with the temperature so as to accurately control the temperature of the electric heat mat. The temperature controller further comprises a temperature compensating unit, a positive feedback circuit unit, a safety protective circuit unit and an error correction unit. The temperature measured by the temperature measuring unit is compensated so as to measure the heating temperature of the Thermal sensitive wire errorlessly. In addition, a temperature comparing unit can stably output control signal. When the heater and sensor are short-circuiting and the sensor senses the adequate industrial electricity, a high level measuring voltage is supplied to a temperature comparing unit so as to switch the output device to the closing status and cut off the heating electrical source to the heater. Further, the error generated by the member connecting with the sensor or temperature setting unit is eliminated manually.

An object is to provide an inverter device capable of detecting the welding of a switching device in early stages, and in summary, the inverter device is equipped with a parallel circuit of a charging circuit and a switch connected between a battery and an inverter module, and comprises a capacitor charged from the battery via the charging circuit; a resistor to discharge the capacitor; a serial circuit including resistors to detect a voltage after the switch; and a diode connected between a connection point of the serial circuit including the resistors on a positive line and a connection point of the capacitor, and directed forward to the capacitor side.

The power supply device of the present invention supplies power individually to a plurality of disk drives by rendering a plurality of DC/DC converters redundant. One redundant power supply substrate is assigned to a plurality of normal power supply substrates. One redundant power supply substrate supports the outputs of a plurality of normal power supply substrates. The main DC/DC converters in the normal power supply substrate correspond with the subgroups on a one-for-one basis. The secondary DC/DC converters in the redundant power supply substrate each correspond with all of the respective subgroups and are able to supply power to a predetermined single disk drive among the respective disk drives in the subgroups for each of the subgroups.

According to a method of controlling the operation of a flash memory device including a number of memory blocks, a memory block of the memory blocks is first selected as a reference block. A program operation is performed on a memory cell included in the reference block. In order to check an operating characteristic of the reference block, a threshold voltage level of the programmed memory cell is read. Parameters for performing an operation of the flash memory device are determined based on the operating characteristic of the reference block. The parameters are stored in the reference block.

A controller operates a power supply in a discontinuous mode. While in the discontinuous mode, a monitor resource in the controller monitors current supplied by an inductor resource in the power supply to produce an output voltage to power a load. An adjustment value generator produces an adjustment value based on a magnitude of the current supplied to the load by the inductor resource. According to one configuration, the adjustment value equals the average inductor current multiplied by the load-line resistance value of the power supply. The controller produces an adjusted trigger threshold value by reducing a trigger threshold value by the adjustment value generated by the adjustment value generator. The adjusted trigger threshold value specifies a reduced threshold voltage at which the power supply controller turns ON a control switch in the power supply to increase an amount of current supplied by the inductor resource to the load.

A battery system includes: a battery configured to be charged or discharged; a temperature sensor configured to detect a temperature of the battery; a heater configured to warm the battery; a charger configured to supply electric power from an external power supply to the battery and the heater; a relay provided in a passage through which the electric power from the charger is supplied to the battery; and a controller configured to control operations of the charger and the relay. The controller is configured to supply predetermined electric power from the charger to the heater and turn off the relay so as not to supply the electric power from the charger to the battery in a case where an SOC of the battery is equal to or more than a threshold and the temperature of the battery is lower than a predetermined temperature.

The invention discloses a device for changing the charging efficacy or discharging efficiency of a battery according to the condition of the battery. A sensing unit is used in the device for sensing the condition of the chargeable battery and sending out an alarm signal when the condition of the battery meets a preset condition; then a control unit receives the alarm signal and reduce the discharging efficiency of the battery according to the alarm signal; or reduce the charging efficiency of the battery.

Provided is a bidirectional DC/DC converter which can control a boost voltage in a wide range. The DC/DC converter includes: three series circuits (3) formed by a first to a sixth switch (Q3 to Q8), each two of which are connected in series between a plus terminal and a minus terminal of a high voltage side; two transformers (1, 2) in which primary windings are connected in series and input terminals of the primary windings (T1LM, T1L, T2LM, T2L) are connected to connection points (K1 - K3) of the switching elements; and a seventh to a tenth switch (Q9 - Q12). The transformers have secondary windings, each of which is divided at the middle point (P1, P2). The middle points are connected to a minus terminal of a low voltage side. Respective terminals of the secondary windings (T1AM, T1B, T2AM, T2B) are connected to a plus terminal of the low voltage side by the seventh to the tenth switches (Q9 - Q12).

A 7-phase multistage linear induced electromagnetic propeller comprises a driving coil, an armature, pulse power supplies and a charger. The driving coil is formed by a plurality of double-pancakes which are coaxially arranged on an insulation skeleton and is divided into multiple stages. Each stage of the driving coil is externally connected to one group of the pulse power supplies. A single-phase power supply in one group of the pulse power supplies is formed by one pulse capacitor and one discharging switch. One charger charges the capacitors of all the pulse power supplies. The multistage driving coils are coaxially arranged on one insulating sleeve and are fixed. The armature is placed in a first stage driving coil. The armature forges ahead linearly in the driving coil under an electromagnetic force effect. The armature accelerates from the first stage driving coil. When the armature arrives at a position of a next stage driving coil, the pulse power supplies which are externally connected to the stage driving coil begin to discharge. And the armature continuously forges ahead.

The invention discloses a digitization inversion arc welding machine output pole short circuit automatic protection system which comprises an inversion main circuit, a feedback circuit, a single-chip microcomputer circuit and a pulse width modulation control circuit, wherein the inversion main circuit is used for providing current and voltage required for a welding machine, the feedback circuit is used for obtaining output voltage of the welding machine output pole, the single-chip microcomputer circuit sends switching signals according to feedback voltage of the feedback circuit, and the pulse width modulation control circuit controls the communication and disconnection of the output current and the output voltage of the inversion main circuit according to the switching signals. Due to the fact that the single-chip microcomputer and the pulse width modulation (PWM) control circuit control the output of the welding machine, damage, caused by short circuit, of the welding machine is avoided, and short-circuit failure is removed without the need of shutdown. The digitization inversion arc welding machine output pole short circuit automatic protection system is convenient to use, fast and safe.

A control unit for an electric machine. The control unit has a processing unit and a power output stage connected to the processing unit. The power output stage is connected to outputs of the control unit for stator coils of a stator of the electric machine. The processing unit is designed to supply current to the power output stage for generating a stator field, in particular a rotating magnetic field. The control unit comprises an electrical energy store, in particular an intermediate circuit capacitor or accumulator, connected to the power output stage. The control unit includes an input for a control signal, for example a temperature signal. The processing unit is preferably designed to actuate the power output stage as a function of the temperature signal such that the energy store can be heated by a current application pattern generated by the power output stage. The current application pattern corresponds to a stator field which cannot generate an effective torque or a rotary motion, such as a full revolution of a rotor of the electric machine.