91results about How to "Improve transient response characteristics" patented technology

The invention relates to a low dropout linear voltage regulator (LDO) without an off-chip capacitor for improving transient response and increasing power supply rejection ratio (PSRR). The LDO without the off-chip capacitor comprises an error amplifier, a reference voltage source module, a power adjusting tube, an NMC Miller's compensating circuit, a PSRR enhanced network and a transient response intensifier circuit. According to the LDO without the off-chip capacitor, the NMC compensation technique is used for meeting the system stability requirement; a second-stage gm improved circuit of the amplifier is used for increasing the charging and discharging currents to the grid of the power tube; a slew rate intensifier circuit is introduced, needed currents can be provided for a load when the load of the LDO is subjected to step hopping from small to large, and thus the transient response capacity of the LDO is improved under the double actions. In addition, the PSRR enhanced network is additionally arranged to be used for controlling the PSRR feedback factors beta of the system, an original zero point is pushed to the position with higher frequency, and therefore the PSRR characteristic of the system is improved. The LDO without the off-chip capacitor is improved on the aspect of transient response and the aspect of PSRR.

A current detection circuit of the present invention has a switching device 1; an auxiliary switching device 2; an offset voltage source comprising an offset resistor device 7 and a current source circuit 8; a compensation circuit, comprising a differential amplifier 4 and a compensation transistor 5, for adjusting the output current of the auxiliary switching device 2 so that the potential obtained by subtracting the voltage drop across the offset resistor device 7 from the output potential of the auxiliary device 1 is equal to the output potential of the auxiliary switching device 2, being configured that the detection level of the current flowing in the switching device 1 is shifted by an offset amount.

The invention discloses a direct current (DC) / DC converter controlled in a digital mode and an efficiency optimization method of the DC / DC converter. The DC / DC converter comprises two parts, namely a power-level circuit and a control unit, the primary level of the power-level circuit comprises a full bridge inversion circuit composed of four groups of switching field-effect tubes Q1, Q2, Q3 and Q 4, an input end of the full bridge inversion circuit is connected with DC high voltage, an output end of the full bridge inversion circuit is connected with a primary winding of a high-frequency transformer, output of a secondary winding of the high-frequency transformer is rectified and filtered and then connected with DC low voltage output, the secondary level adopts a synchronous rectifier composed of two field-effect tubes Q5 and Q6 to lower the conduction loss of the secondary level, and high-precision pulse-width modulation (HRPWM) output of the control unit passes through a driving circuit and is connected with grid electrodes of the field-effect tubes from Q1 to Q6. The DC / DC converter controlled in a digital mode and the efficiency optimization method of the DC / DC converter achieves digital control of the DC / DC converter, meanwhile, the self-adaptive synchronous rectifier optimizes a dead time, and therefore higher conversion efficiency is achieved.

Disclosed is a semiconductor integrated circuit for regulator including: a control transistor; a voltage divider circuit generating a feedback voltage proportional to an output voltage; a control circuit controlling the control transistor based on difference between the feedback voltage and a reference voltage; and a terminal through which an output voltage switching control signal is received, and being configured to switch the output voltage into a first voltage or into a second voltage lower than the first voltage, by varying division ratio in the voltage divider circuit in response to the signal. The semiconductor integrated circuit further includes: a discharging transistor between the output terminal and the ground; and a circuit outputting a signal for keeping the discharging transistor turned on over a period from change of the signal to fall of the output voltage from the first voltage down to the second voltage.

Provided is a voltage regulator that is capable of improving a transient response characteristic while suppressing current consumption. A fluctuating output voltage is detected without increasing the current consumption of a differential amplifier, and a phase compensation resistor (60) is temporarily short-circuited, to thereby decrease a time constant determined by a parasitic capacitance of an output transistor (40) and the phase compensation resistor (60) to improve the transient response characteristic. Alternatively, a voltage divider circuit (50) is short-circuited to temporarily increase the current consumption and correct the output voltage, with the result that the current consumption during a normal operation is relatively low, and the transient response characteristic is improved by increasing a current only during a transient response.

A voltage regulator having good transient response characteristics and maintaining stable operation is provided. The voltage regulator includes: a first MOS transistor having a gate terminal connected to an output terminal of the differential amplifier circuit; a first constant current source provided between the first MOS transistor and a ground terminal; an output MOS transistor having a gate terminal connected to a drain terminal of the first MOS transistor via a phase compensation circuit; a second MOS transistor having a gate terminal to which an output of the differential amplifier circuit is input and a drain terminal connected to the gate terminal of the output MOS transistor; and a second constant current source provided between the second MOS transistor and a ground terminal.

The invention relates to a switch power source technology, and discloses a transient response enhancement control circuit used for a switch power source. According to the technical scheme, the transient response enhancement control circuit used for the switch power source comprises a frequency divider module, a storage module and a comparator module. The frequency divider module is connected with driving signals of a high-end power tube of the switch power source and used for generating control signals according to the driving signals to control the storage module. The storage module is connected with a feedback current, and collects and stores the maximum value of the feedback current of the previous period under the control of the control signals. The comparator module is connected with the storage module and compares an instantaneous value of feedback voltage with the maximum value, when the instantaneous value of the feedback voltage is larger than the maximum value, the output signals of the comparator module turn over, and the high-end power tube of the switch power source is turned off. The transient response enhancement control circuit used for the switch power source effectively overcomes the defect that when the switch power source jumps into a light-load state from a heavy-load state, transient response is poor.

The invention provides an electric-assistance variable nozzle turbocharging system, and belongs to the technical field of turbochargers. The electric-assistance variable nozzle turbocharging system and the control method thereof aim at enabling a motor and a turbine variable nozzle ring to be coordinated through the influences of the motor and the turbine variable nozzle ring on performance of an engine. A diesel engine cylinder is directly connected between a gas inlet branch pipe and an exhaust branch pipe of the system. A gas inlet pipe is connected to the gas inlet branch pipe. An exhaust pipe is connected to the exhaust branch pipe. An intercooler is installed on the gas inlet pipe. An electric-assistance variable nozzle turbocharger is installed at an inlet of the gas inlet pipe and an outlet of the exhaust pipe. According to the electric-assistance variable nozzle turbocharging system and the control method, the high-speed motor is controlled on the basis of the air-fuel ratio of a diesel engine and the state of a storage battery, the gas inflow amount of the cylinder can be effectively and rapidly regulated so as to be matched with the changes of the oil spray amount, coordinated synchronization of oil and gas is achieved, it is ensured that the diesel engine keeps an appropriate air-fuel ratio value under various working conditions, and meanwhile it is ensured that the battery works in a high-efficiency area.

Systems and methods for controlling compressor inlet flow in a turbocharger of an engine are described. In one example, a method for controlling a compressor inlet flow of an engine turbocharger system comprises: directing air from a high pressure source to an inlet upstream of a compressor wheel via a conduit coupled to the inlet and the high pressure source, where the conduit is obliquely coupled to the inlet.

A plant control device according to the present invention includes a feedback controller and a reference governor. The feedback controller is configured to determine a control input of a plant by feedback control so as to bring an output value of a control amount of the plant close to a target value. The reference governor is configured to calculate a future predicted value of a specific state quantity of the plant by using a model of a closed loop system including the plant and the feedback controller, and correct the target value that is given to the feedback controller based on the predicted value of the specific state quantity and a constraint that is imposed on the specific state quantity.

An output device includes an output transistor that outputs an output current, a first driver that drives the output transistor so that a feedback voltage of an output voltage of the output transistor is in agreement with a reference voltage, an RC circuit that has a capacitor connected to the ground and a resistor connected in series to the capacitor, and a second driver that drives the output transistor to increase the output current when a potential difference between ends of the resistor, generated by the feedback voltage supplied between ends of the RC circuit, is increased by a decrease of the output voltage.

The invention relates to an equipotential mask capacitor type voltage transformer. The equipotential mask capacitor type voltage transformer comprises a capacitor voltage divider and an electromagnetic unit. The electromagnetic unit comprises a compensation electric reactor that is connected with the output end of the capacitor voltage divider, and an intermediate transformer whose primary winding is connected with the compensation electric reactor. The secondary winding of the intermediate transformer comprises a main secondary winding and a surplus winding. The surplus winding is connected in parallel with an iron magnetic resonance damper. In the equipotential mask capacitor type voltage transformer, the iron magnetic resonance damper is able to inhibit the overvoltage of iron magnetic resonance effectively, and is able to improve the transient response property of the iron magnetic resonance damper greatly.

A static var compensator controlling device for improving the system transient stability is characterized by comprising a measurement module, an AC analogy quantity input module, a state space transition module, a control module, a state space reverse transition module, a thyristor trigger and control module and a SVC (Static Var Compensator) device module.

A digital control switching power supply unit converts an input voltage into a desired output voltage using a digitally controlled pulse width modulation (PWM) signal according to a switching cycle. The power supply unit includes an analog-to-digital converter (ADC). The ADC converts a result of a comparison between an output voltage and a reference voltage to a digital signal during a conversion cycle. The ADC includes a circuit for outputting a phase difference between a switching cycle and the conversion cycle, and a delay circuit. The delay circuit generates a delay output current based on a result of the comparison and the phase difference and determines the conversion time delay according to the delay output current. The delay circuit also generates a delay reference current based on the reference voltage and the phase difference and determining the duration of the conversion cycle according to the delay reference current.

Systems and methods for controlling compressor inlet flow in a turbocharger of an engine are described. In one example, a method for controlling a compressor inlet flow of an engine turbocharger system includes: directing air from a high pressure source to an inlet upstream of a compressor wheel via a conduit coupled to the inlet and the high pressure source, where the conduit is obliquely coupled to the inlet.

The invention relates to an air inlet pipe of an integrated intercooler, comprising a transition pipe 1, an upper side air inlet cavity 2, an intercooler 3 and a lower side air inlet cavity 4, wherein an inlet of the transition pipe 1 is connected with an outlet of a compressor; an outlet of the transition pipe 1 is connected with an inlet of the upper side air inlet cavity 2; and the intercooler 3 is embedded between the upper side air inlet cavity 2 and the lower side air inlet cavity 4. After being pressurized by the compressor, external fresh air enters the upper side air inlet cavity 2 from the outlet of the compressor through the transition pipe 1, enters the intercooler 3 for cooling, and finally enters an air cylinder of an engine for combustion through an air inlet manifold of the lower side air inlet cavity 4. With the adoption of the air inlet pipe of the integrated intercooler disclosed by the invention, not only can an arrangement space be saved, the length of a pipeline from an outlet of the compressor and an inlet of an air inlet path be greatly reduced, the working properties of a supercharged diesel engine be improved, and the quality of the engine be reduced; but also the volume of an air inlet system is reduced, the air inlet uniformity is improved, and the transient response property of the engine is improved. Pressure fluctuation inside the air inlet manifold is less due to the voltage stabilization and filtering effect of an intercooler core, so that the air inlet pipe of the integrated intercooler is more beneficial to improving an air inlet filling amount and an air inlet vortex quality.

The invention discloses a device for improving transient response of a natural gas engine and further discloses a response method of the device. The device comprises a gas inlet header pipe, a normalgas supplying channel, a fuel gas supplying pipe and a fuel gas spraying valve. The normal gas supplying channel further communicates with a transient response gas supplying channel. The device further comprises an accelerator position sensor used for detecting the opening degree of an accelerator pedal and a rotating speed sensor used for detecting the rotating speed of the engine. The normal gassupplying channel, the transient response gas supplying channel, the accelerator position sensor and the rotating speed sensor are connected to an electronic control unit (ECU) of the engine. Fuel gas is supplied to the engine through the normal gas supplying channel, when it is judged that the ECU needs to conduct transient response according to all detecting parameters, and the fuel gas is supplied through the transient response gas supplying channel; and meanwhile an anti-surging valve is opened to discharge air, air supplying is improved, the air inlet amount of the engine is increased quickly within a short time, and the transient response property of the engine is improved.

The invention discloses a staggered parallel high-stability modularized direct-current current-stabilized power supply system, which belongs to the technical field of variable flow in the power industry. The conventional redundancy technology for a voltage type power supply system is applied to a current type power supply system. The conventional staggered parallel connection technology is improved and applied to a current type power supply system. Self-verification synchronization technology is adopted, so that correct transceiving of each module of the system can be ensured, the influence of transmission time delay of the system on a synchronizing signal is minimized, each module of the system can receive the synchronizing signal and staggered parallel connection of the system is realized truly. When a plurality of power supply modules run in parallel, output total current can reach thousands accuracy effect, the size of a filtering device is reduced and transient response characteristic of the system is enhanced.

The invention provides a flexible structure three-dimensional form inversion method based on PSD optical measurement. The relative displacement of a feature point of a flexible structure is measured by utilizing a laser position sensor PSD, and meanwhile, a gyroscope is used for measurement and integration to obtain a corresponding structure rotation angle, so that the displacement is corrected; by using structural modal vibration type information obtained by pre-analysis of a finite element or a test method, the three-dimensional form of the whole flexible structure is obtained through vibration type superposition inversion. Compared with a traditional form inversion method based on optical fiber or other optical measurement means, the method has the advantages that the number of measuring points is small, the measuring frequency band is wide, distribution is easy, and an inverse algorithm is simple.

Disclosed is a two-level adjustable supercharged diesel engine variable-altitude supercharging pressure self-adaptive adjusting control method. A diesel engine ECU is combined with a real-time monitored accelerator pedal position, diesel engine rotation speed and altitude to inquire about variable-altitude diesel engine torque MAP, and expected torque of the current working condition is obtained.A torque and gas intake flow corresponding curve is inquired about through the expected torque, and the expected gas inflow quantity of a two-level supercharging system is obtained. According to the expected gas inflow quantity, a high and low pressure level supercharger pressure gas characteristic MAP graph is inquired about, total pressure of the two-level supercharging system is obtained, an NMPC supercharging pressure controller calculates open degrees of a bypass valve at high and low pressure levels according to the difference of the expected pressure and actual pressure, the diesel engine ECU controls the change of the open degree of a blade, and thus the actual supercharging pressure is equal to the expected supercharging pressure. Two-level adjustable supercharged diesel engine supercharging pressure variable-altitude self-adaption can be achieved through the two-level adjustable supercharged diesel engine variable-altitude supercharging pressure self-adaptive adjusting control method, the diesel engine high-altitude transient response characteristic and acceleration characteristic are promoted, and the influences of altitude increasing on power performance and economy ofthe diesel engine are effectively relieved.

The invention discloses a power control system of a hybrid heavy duty truck with a super capacitor. The system comprises an engine, a generator, a rectifier, an inverter, a motor controller and a motor which are sequentially connected, a storage battery and a first bidirectional DC-DC converter which are sequentially connected, a super capacitor and a second bidirectional DC-DC converter which aresequentially connected, a battery capacitance control unit, a signal acquisition unit, a triaxial gyroscope, a GPS positioning device and a power controller. Based on the control system, the invention further discloses a power control method of the hybrid heavy duty truck with the super capacitor, the road conditions on which heavy duty trucks frequently travel are related to super capacitor charging and discharging, so that the reasonable power matching is realized, the power performance, fuel economy and emission performance of the hybrid heavy duty truck are improved, the service life of the storage battery is prolonged, the energy recovery and utilization are realized, and the energy is fully saved.