76results about How to "High output voltage accuracy" patented technology

In an in-vehicle mount electronic controller, a constant-voltage power supply generates a high-precision small-capacity 5V output voltage Vad, a low-precision large-capacity 5V output voltage Vif and a low-precision large-capacity 3.3V output voltage Vcp, and also generates at least one of a low-precision small-capacity 2.8V output voltage Vup and a high-precision small-capacity 3.3V output voltage Vsb. A judgment signal input circuit logically combines comparison results of divided voltages of the above output voltages Vif, Vcp, Vup and Vsb with a divided voltage of the output voltage Vad as a reference voltage, and inputs relative voltage information ER2, ER3, ER4 and ER5 to a microprocessor. The microprocessor comprehensively judges the output voltages containing the comparison reference voltage, and reports abnormality or saves abnormality occurrence information.

The invention discloses a delayer control transfer circuit and a power supply system. The circuit includes a PMOS transistor and an NMOS transistor connected in series between a voltage input terminal and an earthling terminal, a first divider resistance series, a comparator and a logic controller connected in series between a voltage output terminal and the earthling terminal, wherein an output terminal of the comparator is connected to an input terminal of the logic controller, and two output terminals of the logic controller are respectively connected to the grids of the PMOS transistor and the NMOS transistor. The circuit also includes a negative feedback unit which is connected between the voltage output terminal and the input terminal of the comparator and used for negative feedbackcontrol of the output voltage of the delayed control transfer circuit and the clamping the output voltage to be a predetermined reference voltage. The invention also provides the power supply system.By the method and the system in the invention, the output voltage error of delayed BUCK is removed.

The invention relates to an intelligent gateway and a method. The intelligent gateway comprises an ARM11 processor, a zigbee wireless transmitting and receiving module, an interface module, a storage module and a power supply module, wherein the ARM11 processor is connected with the zigbee wireless transmitting and receiving module, the interface module, the storage module and the power supply module in sequence. Compared with the prior art, the intelligent gateway has the advantages of being low in power consumption and cost, and reliable in communication quality.

The present application discloses a control method and a control device for parallel inverters. The method comprises: receiving a feedback signal Vmg reflecting load voltage and a voltage reference signal Vref to generate a command signal P_set reflecting active power and a command signal Q_set reflecting reactive power; taking the command signal P_set reflecting active power as the first offset of an active power-output voltage frequency curve (P-F) of an inverter unit, and taking the command signal Q_set reflecting reactive power as the second offset of an reactive power-output voltage amplitude curve (Q-V) of the inverter unit; transversely translating the curve (P-F) of the inverter unit according to the first offset, transversely translating the curve (Q-V) of the inverter unit according to the second offset, and adjusting the load voltage of the inverter system by means of adjusted output voltage frequency and output voltage amplitude of the inverter unit.

The invention discloses a digital voltage regulating module with the high fractional load efficiency and the high dynamic characteristic. The digital voltage regulating module comprises a direct-current voltage source, a voltage output end, a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a first inductor, a second inductor and a DSC. A main circuit adopts an interlaced BUCK topology circuit and a main switching tube Q1 is conducted with a main switching tube Q3 by being interlaced with the main switching tube Q3 in 180 degrees. Thus, output current ripples are greatly reduced, the ripple frequency of output currents is increased to be two times that of original output currents and the output filter inductance and the output capacitance can be greatly reduced as the ripple frequency is increased. Thus, the dynamic responding speed of a VRM is improved. In addition, in the time of fraction load, two synchronization rectifier tubes Q2, Q4 are switched off, so that inductance currents are continued through a current continuing diode D2s and a fly-wheel diode Ds4. Thus, a single-phase BUCK circuit can work under a DCM mode, switching losses of the switching tubes and magnetic core losses are greatly reduced and the fraction load efficiency of the VRM is greatly improved.

The invention provides a fast response circuit and a dynamic process detection method of a switching power supply. By adopting the fast response circuit and the dynamic process detection method, high output voltage accuracy in a secondary feedback control mode and fast dynamic response speed can be obtained. According to the detection method, the dynamic process when output load changes suddenly can be fast detected, acts can be adopted before secondary voltage negative feedback, output voltage can be adjusted timely, and therefore the dynamic response speed as fast as the primary feedback can be obtained.

Polycrystalline silicon resistors are covered with a metal wiring connected to one of terminals of a resistor circuit in order to provide a stable resistor circuit, and a variation in resistance owing to a resultant potential difference between the metal wiring and the resistor is cancelled by gradually changing the length of low concentration impurity region and high concentration impurity region of the respective resistor that constitutes the resistor circuit.

The invention discloses a LDO (Low Dropout Regulator) with a wide input voltage range and a high power supply rejection ratio and belongs to the technical field of power electronics. The LDO comprisesan error amplifier, a power module, a pre-step-down module, a high voltage resistant module and a power supply rejection ratio enhancement module, wherein the pre-step-down circuit module is utilizedfor preprocessing an input voltage of the LDO to obtain a low power supply voltage used for supplying power to a low-voltage circuit part; power is supplied to the error amplifier and the high voltage resistant module so as to obtain a high power supply rejection ratio by utilizing the low power supply voltage, and the input voltage range of the LDO is widened by virtue of the high voltage resistant module; meanwhile, by utilizing the power supply rejection ratio enhancement module inside the LDO circuit, the power supply rejection ratio of the LDO at a high frequency end is further improved;finally the input voltage of the LDO is processed by utilizing the power module, a feedback voltage is obtained to control a positive input end of the error amplifier so as to obtain enough loop gainfor improving the output accuracy of the LDO, and the output voltage of the power module is a final output voltage of the LDO. The LDO disclosed by the invention is wide in input range, small in chipoccupied area and high in power supply rejection ratio.

The invention discloses an electric energy meter for an electric locomotive, which comprises a data recording and processing module, a power module, an electric energy metering module and an inductive measuring device, wherein the electric energy metering module is connected with an alternating-current electric wire. The power module is connected with the data recording and processing module, the electric energy metering module is connected with the data recording and processing module, and the inductive measuring device is connected between the alternating-current electric wire and the electric energy metering module. The electric energy meter avoids the impact of high voltage and high current coming down from a pantograph on the electric energy metering module, so that accuracy of electric energy metering data is ensured.

A challenge in outputting a voltage near the midpoint potential in a semiconductor switch which operates based on a low voltage power supply is to avoid a decrease in operation speed and a deterioration in accuracy of the output voltage which would be caused due to an increase in ON-resistance or occurrence of current leakage. Thus, a structure including a gray level generation circuit (100), an analog switch circuit (111) and a backgate voltage control circuit (122) is provided wherein the backgate voltage of each of an N-channel MOS transistor (112) and a P-channel MOS transistor (113) of the analog switch circuit (111) to which the voltage of the gray level generation circuit (100) is input is supplied from the backgate voltage control circuit (122) which has an equal structure as that of the gray level generation circuit(100).

A challenge in outputting a voltage near the midpoint potential in a semiconductor switch which operates based on a low voltage power supply is to avoid a decrease in operation speed and a deterioration in accuracy of the output voltage which would be caused due to an increase in ON-resistance or occurrence of current leakage. Thus, a structure including a gray level generation circuit, an analog switch circuit and a backgate voltage control circuit is provided wherein the backgate voltage of each of an N-channel MOS transistor and a P-channel MOS transistor of the analog switch circuit to which the voltage of the gray level generation circuit is input is supplied from the backgate voltage control circuit which has an equal structure as that of the gray level generation circuit.

The invention provides a four-channel electronic control system for controlling automobile lamp lighting. The four-channel electronic control system comprises a power conversion module, a microcontroller module, a switching module and a 5V voltage conversion module, wherein the power conversion module comprises DC-to-DC boost and buck modules; the boost module boosts battery voltage to stable voltage higher than the voltage of all lamp strings as input voltage of the buck module; the buck module converts output voltage of the boost module into the voltage of LED lamp strings and has a constant-current output function; different voltage of the lamp strings correspond to the same output current through adjusting the internal working frequency; and the microcontroller module has the functionsof setting working parameters of a main power control chip, responding to a lighting instruction given by an automobile body control module at a finished automobile end to control on and off of various lamp strings and monitoring components of the electronic control system and the temperature of an LED on a lamp panel. According to the four-channel electronic control system, four paths of lamp strings can be driven through two paths of output of the buck module, thereby reducing the cost and improving the integration level.