68results about How to "High voltage accuracy" patented technology

The invention discloses a reference voltage regulating circuit of an integrated circuit. A reference voltage system of the integrated circuit comprises an LDO module, a regulation module and a regulation control module. The regulation module comprises a first-stage calibration and regulation module and a second-stage calculation and regulation module. The regulation control module is connected with an off-chip program control module, a regulation control signal is generated according to a calibration signal provided by the program control module, the first-stage calibration and regulation module conducts first-stage calibration on reference voltage of the integrated circuit according to the regulation control signal, the second-stage calibration and regulation module conducts second-stage calibration on the basis of first-stage calibration according to the regulation control signal, the reference voltage is regulated to preset reference voltage, and accordingly the voltage range and precision of reference voltage regulation are effectively improved through two stages of calibration. The invention further discloses a reference voltage regulation system of the integrated circuit. The reference voltage regulating system comprises the reference voltage regulation circuit and the off-chip program control module.

An embodiment of the present invention may seek to match the generator and grid voltages before the powerplant machine reaches the grid matching speed during the start-up process. An embodiment of the present invention may provide a predictive algorithm, or the like, to control the acceleration rate of the powerplant machine to target a particular phase angle differential between the powerplant machine and the grid when the powerplant machine reaches the grid matching speed. Here, the phase angle difference may be targeted such that a generator breaker may be closed immediately after the powerplant machine accelerates beyond the grid matching speed. This may avoid the generator experiencing a phase angle differential, which may add to the power transient associated with the generator breaker closure.

The invention provides a high-precision and wide-current-range current mirror. The high-precision and wide-current-range current mirror comprises a reference current input part, a current gear judgment and control logic and an image current output part. The reference current input part and the image current output part are connected with the current gear judgment and control logic. The high-precision and wide-current-range current mirror has the advantages that the current mirror capable of working in a linear area in a current gear switching mode is adopted, a current mirror circuit is improved, the VDS voltage precision is improved, accordingly, the current mirror image precision is improved, and the current mirror image range is widened.

Improved voltage stiffness in the output voltage of an inverter used for a motor drive is obtained by a minor voltage feedback loop connecting the output of the inverter to a three-phase input in a vector domain.

The invention discloses a frequency measuring system for a universal voltage input power frequency signal. The system consists of a signal conditioning circuit, an isolation operational amplification circuit, a lowpass filtering circuit, a comparator circuit and a digital signal processor, wherein the signal conditioning circuit is designed by adopting a universal circuit, an alternating current power frequency signal is suitable for a voltage range from 1V to 250V, thus meeting most application occasions of a power system, the isolation operational amplification circuit is used for isolating strong current signals from weak current signals and replacing the traditional transformer components, the lowpass filtering circuit and the comparator circuit are matched with the isolation operational amplification circuit for changing alternating current signals into direct current signals, and signals output by the comparator circuit do not need to be subjected to signal isolation and can be directly connected to the digital signal processor for finishing frequency calculation. The method has the characteristics of simple circuit, small size, little phase delay and the like.

The invention discloses a thermal battery positive electrode material and a preparation method thereof. Tungsten (molybdenum) metal ions are used as a positive electrode material of an electron acceptor; the main components of the positive electrode material comprise tungsten (molybdenum) sulfide, an additive, an electronic conductive agent, an ion conductive agent and a binder; through steps of ahigh-temperature roasting process, a vacuum-atmosphere replacement roasting process, an additive passivation treatment process, a mechanical activation roasting process, a crushing, sieving and packaging process and the like, the contents of volatile and decomposed impurities are reduced, the stability of the positive electrode material is improved, and the battery safety is improved. The positive electrode material disclosed by the invention is good in thermal stability, high in material utilization rate, small in self-discharge, large in output capacity and long in working time, and is an ideal positive electrode material of a high-capacity long-time thermal battery.

The invention relates to a high-capacity unified power quality conditioner based on a chain structure and a control method of the high-capacity unified power quality conditioner. A three-phase three-wire system series-and-parallel structure is adopted in the high-capacity unified power quality conditioner. The high-capacity unified power quality conditioner comprises a series type voltage source converter and a parallel type voltage source converter, wherein the series type voltage source converter and the parallel type voltage source converter are connected through a common direct-current bus, single-phase H-bridge cascade structures are adopted in the series type voltage source converter, the H-bridge cascade structure of each phase is connected to an alternating-current side power grid through a series capacitor, single-phase H-bridge chain link structures are adopted in the parallel side converter, a back-to-back structure is formed by the single-phase H-bridge chain link structures and H-bridge chain links of the series type voltage source converter, and each H-bridge chain link of the parallel side converter is connected to a direct-current side power grid through the secondary side of a single-phase multi-winding transformer. The invention further provides the control method of the high-capacity unified power quality conditioner. According to the high-capacity unified power quality conditioner, a series side transformer is omitted, short-circuit impedance of a loop is reduced, voltage accuracy of open-loop control is improved, performance of the high-capacity unified power quality conditioner is improved, and the problem that the instantaneous inrush current phenomenon happens when voltage drop of the series side happens is solved.

A testing device for a semiconductor integrated circuit of the present invention includes a differential amplifier array module and tester which determine whether an output voltage of a liquid crystal driver LSI is at a proper level and an expected value voltage generator which generates an expected value voltage in accordance with expected value data to output it to the differential amplifier array module. The expected value voltage generator produces expected value data by interpolation in accordance with incoming expected value data fewer in number than the expected value voltage to be generated, so as to be equal in number to the expected value voltage. This makes it possible to carry out an extremely short time and highly accurate test for output voltages of a device under test (liquid crystal driver LSI).

A charging method of a secondary battery having plural cells includes: connecting the plural cells in series and conducting constant current charging by a first power source; measuring voltages of the plural cells; and connecting the plural cells in parallel and conducting constant voltage charging by a second power source, a voltage of which is lower than a voltage of the first power source, in the case where a measured voltage difference among the plural cells is smaller than a specified value.

The invention provides a single battery being capable of resisting overloading and high-spinning and being high in capacity. A preparation method includes the steps of: successively tightly laminatinga nickel square-mesh net, a graphite sheet, positive powder, insulation powder, a negative pole sheet and a current collector; surrounding and compacting the outer rings of the insulation powder andthe negative pole sheet by a current blocking ring which is produced by mixing and pulping MgO and asbestos according to mass ratio of 2:1 and punching the mixture into a ring; the insulation powder is a mixture of LiCl-LiBr-LiF ternary eutectic substance and MgO according to the mass ratio of 1:1-1:1.5, wherein the mixture is compressed to form an insulation layer being 0.4-0.6 mm in thickness; the positive powder is a CoS2 / FeS2 mixture according to the mass ratio of 1:1, wherein the positive powder also contains insulation powder accounting for 15-18% by mass of the positive powder and lithium oxide accounting for 2-5% by mass of the positive powder. The single battery has strong anti-severe environment capability, can output stable voltage and is high in specific energy, and also satisfies the demand of resisting overloading and high-spinning and being long in service life.

A feeding technique for a storage unit is provided, in which power can be supplied from an optimum power source depending on an operation mode of a cache memory, the stable switching of feeding paths can be performed, and the feeding with high voltage accuracy and small voltage variation can be achieved. For its achievement, the feeding system in the RAID system including a hard disk drive, a disk adaptor, a channel adaptor, and a cache memory is provided. The feeding system includes a DC-DC power source to supply, to the cache memory, the voltage for a normal operation mode in which the data is written / read to / from the cache memory, and a DC-DC power source to supply, to the cache memory, the voltage for a backup operation mode in which the data stored in the cache memory is retained, and the power sources are switched during the feeding depending on the operation mode of the cache memory.

The invention provides a converter feedback control circuit and a converter comprising the converter feedback control circuit. The feedback control circuit comprises n sub-feedback units and a weighing arithmetical unit, and n is a natural number and greater than 1; each sub-feedback unit comprises a feedback input end and a disturbing signal end; the weighing arithmetical unit comprises n signalinput ends and a signal output end, and each sub-feedback unit is used for collecting output voltage of the converter corresponding to each circuit and outputting sampling voltage to each corresponding signal input end of the weighing arithmetical unit; the weighing arithmetical unit is used for carrying out weighted sum on each sampling voltage and outputting feedback control quantity to a control end of a main power circuit unit. The feedback control circuit adopts common ground connection of the weighing arithmetical unit and transformer input primary side and an isolated feedback mode, sothat stable voltage output is respectively achieved among multiple isolated circuits, improves voltage accuracy and load regulation of each circuit of multiple mutual isolated circuit output of the converter, and reduces ripple wave noise output by a secondary circuit.

An electronic device of a source driver in an LCD device, for enhancing accuracy of voltage outputted to an equivalent capacitor of a panel of the LCD device, includes a first node, a second node, an output unit, a first charge sharing switch, a second charge sharing switch, a first precharge switch, and a second precharge switch. The electronic device only uses two precharge switches to implement the precharge function and can decrease the current limiting resistor for enhancing the output voltage accuracy and decrease the charge time of the equivalent capacitor.

The invention provides a group control method of a multiplexed output module power supply with a low crossed adjusting rate. In a control process of the method, an multiplexed output is divided into 2-3 groups and a controller is arranged for each group to respectively control an output of each group; in a grouping process, one or more paths of outputs with the similar output power or in the same working mode are divided into one group; and when one group contains two paths of the outputs or more, weighting feedback is carried out. The group control method is characterized in that the outputs with the similar output power or in the same working mode are combined into a transformer to reduce the height of the transformer and reduce the leakage inductance of the transformer. Different groups can relatively independently carry out closed ring control or multi-path weighting feedback control so that the voltage precision and the crossed adjusting rate of the multiplexed output are improved.

The invention discloses a solar multifunctional bus station convenient for people. The solar multifunctional bus station comprises a DSP microcontroller, a serial port communication circuit and a solar photovoltaic array. The input end of the DSP microcontroller is connected with a wireless receiving module, a temperature sensor and a voltage and current detection circuit, and the output end of the DSP microprocessor is connected with a display and a storage battery charge and discharge protection circuit; the input end of the storage battery charge and discharge protection circuit is connected with a DC / DC conversion circuit, and the output end of the storage battery charge and discharge protection circuit is connected with a storage battery; the output end of the storage battery is connected with an LED illumination part and a voltage conversion circuit; and the output end of the voltage conversion circuit is connected with a first USB interface circuit, a second USB interface circuit and a third USB interface circuit. According to the invention, the solar multifunctional bus station convenient for people is novel in design, is clean and environmental friendly, has the functions of displaying the distance between each bus and a local station and rapidly charging a mobile phone by use of a solar storage battery in case of an emergency, and is complete in functions and high in practicality.

The invention discloses an avalanche photo diode (APD) bias voltage adjustment circuit based on negative voltage adjustment. The circuit includes a pixel outside bias voltage generating module and a pixel inside bias voltage adjustment module. The pixel outside bias voltage generating module uses a first operational amplifier and a second operational amplifier to clamp source voltages of a secondPMOS tube and a fourth PMOS tube to stepping voltage and 0V. The pixel inside bias voltage adjustment module uses a first current mirror unit and a first PMOS tube in the pixel outside bias voltage generating module to form a proportional current mirror structure, different proportions of mirroring are realized through controlling switches, and thus floating ground voltage is adjusted to an integer multiple of the stepping voltage. The pixel inside bias voltage adjustment module uses a second current mirror unit and a third PMOS tube in the pixel outside bias voltage generating module to forma current mirror structure, the floating ground voltage is clamped to 0V when all the switches in the first current mirror unit are turned off, and stepping adjustment of APD bias voltage is realized.A manner of negative voltage adjustment is adopted to expand an adjustment range of the APD bias voltage, and improvement of detection sensitivity of an APD array is facilitated.

The invention relates to an over-voltage protection circuit. The circuit comprises a constant-current protection module, a reference voltage module, a comparison module, and an on / off control module.The first input end of the comparison module is connected with an input power supply. The input end of the constant-current protection module is connected with the input power supply. The output end of the constant-current protection module is connected with the input end of the reference voltage module. The output end of the reference voltage module is connected with the second input end of the comparison module. The output end of the comparison module is connected with the controlled end of the on-off control module. The on-off control module controls whether the input power supply suppliespower to a load circuit or not. The constant-current protection module is used for carrying out the constant-current power supply on the reference voltage module and performing the over-voltage protection on the reference voltage module. The reference voltage module is used for providing a stable reference voltage for the second input end of the comparison module. The comparison module is used forcomparing a voltage input by the first input end with the reference voltage, and then outputting a control signal for controlling the on-off state of the on / off control module. The over-voltage protection circuit is wide in voltage application range, fast in response speed and high in voltage precision.

The invention discloses the application of tungsten-molybdenum sulfide in a thermal battery. A thermal battery electrochemical system taking the tungsten-molybdenum sulfide as a positive electrode andmetal lithium and lithium alloy as a negative electrode is adopted, the positive electrode reaction is that tungsten (molybdenum) metal ions receive electrons and are reduced into metal tungsten (molybdenum), and the negative electrode is changed into lithium ions in the mode that free-state lithium loses electrons. Tungsten-molybdenum sulfide is used as a positive electrode; the decomposition temperature of the tungsten-molybdenum sulfide material is high; in the long-time high-temperature discharge process, the self-discharge of a positive electrode material is small, the material utilization rate is high and is 10% or above higher than that of an iron-cobalt-nickel disulfide positive electrode, in the long-time discharge process, the battery discharge is stable, the voltage fluctuationis far less than that of a thermal battery system of the iron-cobalt-nickel-sulfur positive electrode, and the tungsten-molybdenum sulfide is very suitable for a high-voltage-precision component integration system.

The electric power storage device of an electric power storage system includes plural electric power storage bodies and a switching relay. The switching relay is capable of being switched between a first state where the plural electric power storage bodies are connected in series, and a second state where the plural electric power storage bodies are connected in parallel. The switching relay allows each of the plural electric power storage bodies to be electrically disconnected from the rest of the electric power storage bodies. The control unit controls the switching relay into the all-off state where the plural electric power storage bodies are electrically disconnected from each other, when the main relay is in an opened state.

The invention discloses a boost power supply controller for a carrying spacecraft. The boost power supply controller at least comprises M boost circuits and a bus filter unit, wherein the M boost circuits are used for converting output voltages of N storage batteries into required voltages; M is a natural number greater than 1; an output positive terminal of each storage battery is connected with a battery bus bar through a battery input relay; each battery bus bar is electrically connected with an input positive terminal of at least one boost circuit; a positive power output terminal for of each boost circuit is connected with a same bus bar; negative power input and output terminals of all boost circuits all are electrically connected with a negative bus bar; the bus filter unit is used for filtering a high-frequency signal and a low-frequency signal on a bus; the bus filter unit comprises a hall sensor, a bus high-frequency capacitor and a bus low-frequency capacitor, which are sequentially connected with one another; the hall sensor is used for detecting a current between the bus bar and the positive terminal of the bus high-frequency filter capacitor; and the bus low-frequency capacitor is electrically connected with each load power supply interface through each load output relay.

An electronic device of a source driver in an LCD device, for enhancing accuracy of voltage outputted to an equivalent capacitor of a panel of the LCD device, includes a first node, a second node, an output unit, a first charge sharing switch, a second charge sharing switch, a first precharge switch, and a second precharge switch. The electronic device only uses two precharge switches to implement the precharge function and can decrease the current limiting resistor for enhancing the output voltage accuracy and decrease the charge time of the equivalent capacitor.

The invention discloses a radio frequency high-voltage output amplitude automatic control system and method. The system comprises an industrial personal computer, a digital radio frequency signal generation module, a radio frequency high-voltage resonance circuit, a radio frequency current detection circuit, a radio frequency voltage detection circuit, a resonance boosting current detection circuit and an oscilloscope board card; the industrial personal computer, the digital radio frequency signal generation module and the radio frequency high-voltage resonance circuit are connected in sequence; an output end of the radio frequency high-voltage resonance circuit is connected with the radio frequency current detection circuit and the radio frequency voltage detection circuit, the radio frequency current detection circuit and the radio frequency voltage detection circuit are connected with the oscilloscope board card, and a current value and voltage value of an output signal of the radiofrequency high-voltage resonance circuit are measured through the oscilloscope board card; the oscilloscope board card is connected with the industrial personal computer, and the industrial personalcomputer reads the current value and voltage value of the output signal of the radio frequency high-voltage resonance circuit measured by the oscilloscope board card. The radio frequency high-voltageoutput amplitude automatic control system and method have the advantages that any output voltage can be acquired, the stability of the output voltage amplitude is high, the voltage precision is high,the response to voltage stabilization is fast, and the capacity of resisting disturbance is strong.

The invention provides a semiconductor storage device which can restrain the uneven high voltage applied to the storage unit and can provide the high voltage with high precision. The semiconductor storage device includes a storage unit array (23), a Y decoder circuit (21), a X decoder circuit (22), a sense amplifier circuit (24), a Y gate circuit (25), a high voltage generating circuit (2), a high voltage regulator circuit (30), and a voltage adjusting circuit (30A). The voltage modifying data for adjusting the potential of the anode of a zener diode (25) so as to adjust the high voltage applied to the storage unit array (23) is written into the storage unit array (23). The voltage modifying data is used to adjust voltage by the voltage adjusting circuit (30A).

The invention provides a preparation method of a zinc oxide piezoresistor ceramic chip. The method comprises the following steps of: carrying out burdening, mixing, grinding and granulating treatment on a zinc oxide piezoresistor raw material to form ceramic powder; pressing the ceramic powder into green bodies with different shapes through a press, arranging the green bodies into a burning pot, carrying out rubber discharging and sintering to obtain a zinc oxide piezoresistor ceramic body; carrying out cutting through a cutting device to form the zinc oxide piezoresistor ceramic chip; and carrying out surface electrode coating, pin pressing, welding and surface packaging treatment on the cut zinc oxide piezoresistor ceramic chip. By the preparation method of the zinc oxide piezoresistor ceramic chip provided by the invention, the work efficiency is greatly improved; and the product quality is improved.