77results 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 provides a switching mode power source which comprises a rectification filter (1), a controller (2), a switching tube (3) and a transformer (4), wherein a primary coil (41) of the transformer (4) is connected to one end of the switching tube (3), the other end of the switching tube (3) is connected to the current detection end of the controller (2), the output end of the rectification filter (1) is connected to the power source input end of the controller (2), and the drive waveform output end of the controller (2) is connected to the control end of the switching tube (3). The controller (2) is used for outputting a drive waveform according to the input feedback voltage to control the on-off of the switching tube (3) so as to stabilize voltage or current which is output by asecondary coil (42). An auxiliary coil (43) of the transformer (4) is connected to the voltage input end of the controller (2) to input feedback voltage. Because a method of feeding back voltage fromthe auxiliary coil is adopted, the switching mode power source provided by the invention has the advantages of simple circuit and good loop stability.

The constant voltage power source circuit which generates a predetermined constant voltage output Vcc by the use of power supplied from an in-vehicle battery via a power switch has a power transistor and an output voltage adjustment circuit. The output voltage adjustment circuit has a reference voltage generation circuit, a comparison amplification circuit, a resistance circuit network, and a nonvolatile second data memory selecting any of a plurality of on / off elements provided in the resistance circuit network and producing electric continuity of the selected on / off element. The constant voltage output Vcc is measured by an externally connected high accuracy voltmeter in the dispatch adjustment stage to be read out and stored via a serially connected external tool. Output voltage correction data are stored in the second data memory in such a manner as to set the external measurement voltage as a target voltage.

A resonant capacitor and an inductor are connected in series between a primary winding of a transformer and a second switching element. A first rectifying and smoothing circuit including a first rectifier switching element and a capacitor rectifies and smoothes a voltage generated in a first secondary winding of the transformer, and takes out a first output voltage. A second rectifying and smoothing circuit including a second rectifier switching element and a capacitor rectifies and smoothes a voltage generated in a second secondary winding of the transformer, and takes out a second output voltage. A control circuit controls an on-time of a first switching element and an on-time of the second switching element in accordance with the first output voltage and the second output voltage, respectively.

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 Pset reflecting active power and a command signal Qset reflecting reactive power; taking the command signal Pset 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 Qset 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.

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 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.

Each of unit blocks (UB1, UB2) is provided with an output circuit (20) including a serial circuit of FETs (21) and (22). A power supply circuit (1b) can operate in a first mode for generating an output voltage (Vo) using only one of the output circuits (20) or in a second mode for generating the output voltage (Vo) using two output circuits (20) by synchronous / parallel driving. When switching from the first mode to the second mode, start of the synchronous / parallel driving from a state where the FET (22) on the low voltage side is turned on is inhibited (start of the synchronous / parallel driving is waited until the FET (21) on the high voltage side is turned on).

The present invention discloses a charging system on the basis of secondary control and a secondary control device thereof. The charging system comprises: a transformer; a rectifying device; a secondary rectification switch tube and a secondary synchronous rectification auxiliary chip which is used for controlling the start and the stop of the secondary rectification switch tube and allowing a suddenly changed voltage to be enlarged by controlling the secondary rectification switch tube when the changing of the peak current of the secondary rectification switch tube is detected, a line drop compensating signal being generated when the enlarged suddenly changed voltage is fed back to an auxiliary winding; a primary control chip and a primary switch tube, the primary control chip being configured to generate a line drop compensating current when the line drop compensating signal is acquired and being configured to control the primary switch tube to compensate the output voltage of the system according to the line drop compensating current and the voltage and the feedback voltage detected at the voltage detection end. The charging system on the basis of secondary control is able to realize the compensation of the output voltage of the charging system through real time detection of the output current of the charging system on the basis of the secondary control, therefore the precision of the output voltage is greatly improved.

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.

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.

A high-voltage constant-voltage signal source includes a PWM pulse width modulation unit, a pulse transformer, a voltage doubler rectification unit, a feedback unit, a discharge unit and related control circuits. The invention has the advantages of small size, light weight, low power consumption, high precision, etc., and simultaneously has a strong load capacity of 20 GΩ and a low voltage sink value. The main function is to use 15V low voltage to provide a constant voltage source of 500V or 1000V for the motor insulation detection device, so as to meet the requirements of the low-voltage motor insulation automatic monitoring and protection device.

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 semiconductor apparatus for power supply control includes the following. A voltage control transistor is connected between a voltage input terminal and an output terminal. A control circuit controls the voltage control transistor according to an output feedback voltage. A first external terminal is supplied with an output control signal to control output voltage is input. The control circuit further includes the following. A first error amplifier outputs a voltage according to an electric potential difference between a voltage divided by a first voltage dividing circuit which divides the output voltage of the output terminal and a predetermined reference voltage. An output changing circuit displaces the reference voltage input in the first error amplifier or the voltage divided by the first voltage dividing circuit according to a voltage input in the first external terminal to change the output voltage to a voltage according to the output control signal.

The present invention discloses an output voltage controlling circuit and a power supply provided with the same. The output voltage controlling circuit comprises an error elimination circuit, a comparator, a control logic circuit, a conduction timer and a drive circuit, wherein the two input ends of the error elimination circuit are respectively connected with a feedback voltage signal and a reference voltage signal and the two output ends of the error elimination circuit are respectively connected with the two positive input ends of the comparator; the two negative input ends of the comparator are respectively connected with the feedback voltage signal and the reference voltage signal, and the output end of the comparator is connected with the first input end of the control logic circuit; the output end of the control logic circuit is connected with the input end of the drive circuit, and the drive circuit outputs a switch tube controlling signal; and one end of the conduction timer is connected with the second input end of the control logic circuit, and the other end of the conduction timer is connected with the switch tube controlling signal. According to the output voltage controlling circuit and the power supply disclosed by the present invention, a feedback voltage average value and a reference voltage error are detected by the error elimination circuit, and reference voltage is dynamically regulated, so that the purposes of reducing the error and improving the accuracy of outputting the voltage in a mode of constant conduction time control are achieved.

A semiconductor device includes a base insulation film formed on a semiconductor substrate via another layer, a metal thin-film resistance formed on the base insulation film, and a laser beam interruption film of a metal material interposed between the semiconductor substrate and the base insulation film.

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.

A display device includes first and second voltage generation circuits each including a voltage circuit for outputting an internal voltage on the basis of a plurality of clocks, a sampling circuit for sampling an output signal from the voltage circuit, a monitoring circuit for comparing an output signal from the first sampling circuit with a predetermined voltage range and outputting a result, and a power supply generation circuit for generating a power supply voltage to be input to the voltage circuit on the basis of an output signal supplied from the monitoring circuit. The voltage circuit in the first voltage generation circuit is controlled on the basis of a level of the power supply voltage, and the voltage circuit in the second voltage generation circuit is controlled on the basis of periods of the clocks.

A dummy load control circuit is used between a first path output end and a second path output end of a flyback switching power supply circuit having two paths of outputs, and includes a first diode, a second diode, a first resistor, a second resistor, a dummy load device and a first switching tube; a positive electrode of the first diode is connected to a control end of the first switching tube through the first resistor, and a negative electrode of the first diode is connected to the first path output end; and a positive electrode of the second diode is connected with a low potential end of the first switching tube, a negative electrode of the second diode is connected with the control end of the first switching tube, the second resistor is connected to two ends of the second diode in parallel, and a high potential end of the first switching tube is connected to the first path output end through the dummy load device. Also disclosed is a flyback switching power supply circuit. The precision of auxiliary output voltage can be stabilized, and the standby power consumption is not affected.

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.

The invention provides a voltage comparator. The voltage comparator comprises a band-gap reference voltage power circuit and a comparison unit, wherein the band-gap reference voltage power circuit provides band-gap reference voltage; the first input end of the comparison unit receives the band-gap reference voltage, the second input end of the comparison unit is connected with target voltage, andthe output end of the comparison unit outputs a comparison result. The band-gap reference voltage power circuit comprises an operational amplifier, a third resistor, a first intermediate node, a second intermediate node, a sampling switch, a first capacitor, a filter, a reference voltage output end, a switch combination circuit, N bipolar transistors and a control circuit. In different time periods, the switch combination circuit enables the N bipolar transistors to be connected to the second intermediate node one by one, and the remaining bipolar transistors are connected to the first intermediate node in parallel; through rotation, mismatch between the bipolar transistors can be averaged, then higher output voltage precision can be realized, and the voltage comparator can output a more accurate comparison result.