215results about How to "Suppress overshoot" patented technology

To obtain a switching regulator which, when a load suddenly decreases, suppresses overshoot of output voltage without oscillating the output voltage is provided, even if being a current mode switching regulator, the present invention provides a semiconductor device for a switching regulator for converting input direct current voltage input from a direct current power supply to set direct current output voltage and outputting the output voltage from an output terminal, including: an overvoltage protection circuit for: comparing a target voltage with the output voltage at the output terminal; and making the output terminal in a discharge state when the output voltage exceeds the target voltage.

An impulse arc welding control method comprises: repeating electrifying using the electrifying of peak current of in peak period and the electrifying of background current in background period as impulse period; controlling the arc length in the manner that the welding voltage value (Vw) is approximately equal to the set voltage value (Vs); making the arc length to vary periodically by making the set voltage value (Vs) to vary synchronistically with the switching signal (Stc); making the impulse parameter (Ps) to vary synchronistically with the switching signal (Stc); and changing the sending speed (Fs) from the time the switching signal (Stc) varying starts to the time arc length (La) transition varying approximately converges. Thus, the major varying of arc force make the shake movement of the bath becomes more intensive to improve the air bubble reducing effect. Consequently, the air bubble reducing effect is improved in the impulse arc welding method with arc length varied periodically.

In hydraulic pressure control apparatus and method for a continuously variable transmission, a line pressure of the continuously variable transmission is developed with a working oil supplied from an oil pump as an original pressure, and a command pressure is set to develop a line pressure target value of the target value in such a manner that the command pressure is maintained at a predetermined small value for a constant time and, thereafter, the value of the command pressure is raised up to the target value when a shift range of the continuously variable transmission is switched from a neutral range to a running range, the command pressure being raised at a rate lower than a step input to suppress an overshoot developed in the actual line pressure.

A power control IC has a switching control circuit of a fixed on-period type which generates an output voltage from an input voltage by driving a coil by turning on and off an output transistor according to a result of comparison between a feedback voltage and a reference voltage, and a quieting circuit which forcibly turns on the output transistor by ignoring the result of comparison when, after an on-timing of the output transistor, a predetermined threshold time elapses without the next on-timing coming.

The invention discloses a speed and current double closed-loop control system and method for a permanent magnet synchronous linear motor. The method comprises the steps of: designing a permanent magnet synchronous linear motor vector control system; designing a fuzzy adaptive sliding-mode speed controller; designing a nonlinear disturbance observation; designing a d-axis fuzzy PID controller; designing a q-axis fuzzy PID controller; obtaining a desired q-axis current reference value as an input of the q-axis fuzzy PID controller according to the designed nonlinear disturbance observer and thedesigned fuzzy adaptive sliding-mode speed controller; setting a d-axis reference current value as 0, and using the id obtained by subtracting park transform from 0 as the input of the d-axis fuzzy PID controller; after the processing by the d-axis fuzzy PID controller and the q-axis fuzzy PID controller, obtaining the ud, uq of the vector control system, and finally outputting the current operating driving voltage of the permanent magnet synchronous linear motor by the anti-park transformation and SVPWM modulation through the vector control and an inverter. The method enhances the robustnessof the system.

The invention discloses a soft starting control method of a dual-active bridge DC converter applied to an intelligent power distribution network. According to the soft starting control method, a primary-side full bridge is unlocked, a secondary-side full bridge and closed-loop control of an external shift phase angle are shunted, the primary-side full bridge employs chopping control, a switch tubeQ3 and a switch tube Q4 are complementarily conducted at a duty ratio of 50%, the switch tube Q3 and the switch tube Q4 employs variable-duty ratio control, and the period of each switch is increasedat a certain step; when a secondary-side voltage is raised enough to drive the switch tubes and the duty ratios of a switch tube Q1 and a switch tube Q2 both are increased to 0.99, the secondary-sidefull bridge and the closed-loop control of the external shift phase angle are unlocked; and when an output voltage reaches a rated value, a load is switched, the output voltage is stable, and the starting process is completed. By the soft starting control method, the current overshoot of the dual-active bridge DC converter during the starting process is effectively prevented, the positive and negative symmetry of the current is ensured, the current-resistant requirement of the switch tubes is reduced, the cost is reduced, a magnetic biasing phenomenon of a transformer is prevented, and the capacity, the volume and the cost of the transformer are reduced.

The invention provides a switching regulator which makes the output voltage not in the oscillating state in the current way to restrain the overshoot of the output voltage in the condition of load reducing sharply. The semiconductor device of the invention converts the input DC voltage input from the DC power as the given DC output voltage and is used for the switching regulator output from the output terminal, which has a overvoltage protection protective circuit for comparing the object voltage and the output voltage on the output terminal. When the output voltage is larger than the object voltage, the output terminal is in the discharging state.

A fuel cell system performs feedback control with respect to a reactive gas supplying apparatus based on a proportional obtained by multiplying a deviation of an actual flow quantity from a target value of a reactive gas supplied to the fuel cell from the reactive gas supplying apparatus by a proportional gain and an integral term obtained by multiplying the deviation by an integration gain to perform time integration in such a manner that the actual flow quantity coincides with the target value, and changes an update arithmetic operation of the integral term in accordance with a value of the deviation.

A power supply circuit that includes a voltage conversion circuit (CONY) for outputting an output voltage to an output voltage terminal, the output voltage being stepped up or stepped down from an input voltage (VIN) presented to an input voltage terminal, an output capacitor (COUT) coupled to the output voltage terminal, and a charge extraction circuit for extracting the charge of the output capacitor (COUT). Quick response to overshoot of VOUT generated by a sudden reduction in load current (ILOAD) is afforded, and overshoot is minimized.

The invention discloses an LDO circuit which comprises an overshoot restraining circuit and an LDO body circuit. The overshoot restraining circuit comprises a current comparator, a second PMOS tube, a first resistor, a first capacitor and a third PMOS tube. The current comparator compares the tail current of a differential amplifier of the LDO body circuit with the image current of a first active load. In the power-on process, the current comparator outputs a low level and makes the second PMOS tube powered on through the characteristic that the tail current is established earlier than the current of the first active load, the first capacitor is charged after the second PMOS tube is powered on, the grid voltage of the third PMOS tube is raised later than the supply voltage so that the third PMOS can be powered on, the grid voltage of the first PMOS tube at the output end of the LDO body circuit is changed together with the supply voltage after the third PMOS is powered on, and therefore the overshoot of the LDO output voltage in the power-on process is eliminated.

A circuit for lighting a semiconductor light source is provided. The circuit includes: a switching regulator including a switching element and configured to generate a drive current for the semiconductor light source using the switching element; and a control circuit configured to control on-off of the switching element such that the magnitude of the drive current comes close to a targeted value. The control circuit includes: a comparator configured to compare the magnitude of the drive current with the targeted value; an up / down counter configured to count a digital value in a counting-up direction or counting-down direction, based on a comparison result of the comparator; a digital-to-analog converter configured to convert the counted digital value into an analog signal; and a drive circuit configured to control on / off of the switching element based on the analog signal.

The invention discloses a special no-weighing starting torque compensation algorithm for an elevator and a debugging method. The algorithm comprises the following steps that 1) a first set of PI parameters is used for performing the speed ring control with a given speed as 0 on a system before switching off; 2) an elevator moving threshold is set; when the movement of the elevator does not exceed the elevator moving threshold, the first set of PI parameters is always kept until the torque compensation is finished; when the movement of the elevator exceeds the elevator moving threshold, P in the first set of PI parameters of a PI controller is increased, and I is decreased to obtain a second set of PI parameters; the speed ring control with the given speed as 0 is continued until the condition of opposite speed direction and displacement beginning direction is generated; and the second set of PI parameters is adjusted back to the original first set of PI parameters; and 3) a maximum displacement and a maximum speed in the starting torque compensation process are recorded and displayed in a control system menu.

The invention discloses a combine test bed for an electric power steering (EPS) system. The combine test bed comprises a bed body, a power steering system installed above the bed body and a load simulator installed below the bed body, the power steering system comprises a steering wheel, a steering input shaft connected with the steering wheel and a steering output shaft connected with the steering input shaft, the steering input shaft is connected with a torque sensor, and the torque sensor detects the value of torque of the steering wheel, the load simulator comprises a gear and rack type direction machine connected with the steering output shaft, and the direction machine is driven by a brushless motor. According to the combine test bed, data transmission is conducted through a wireless communication module according to a Bluetooth wireless communication protocol, no transmission communication line is needed, and stability of EPS transmission signals is guaranteed; multiple vehicle types can be simulated on the same test bed; EPS is not limited by occasions, transmission signals are stable, and service life is long.

According to an aspect of the present invention, there is provided a power tool including: a motor; a driving circuit that supplies an electric power from a power supply to the motor; a control part that sets a target rotation number for the motor in accordance with a mode selected from a plurality of modes, each mode having a corresponding target rotation number; and a voltage detecting circuit that detects a voltage of the power supply, wherein the target rotation number is varied based on the detected voltage.

The invention relates to a DC power supply controlled by an energy closed loop, comprising a main circuit and a control circuit. The main circuit is a standard Buck circuit. The control circuit comprises: Inductance Current Detection Circuit, capacitance voltage detection circuit, output current detection circuit, Circuit for calculate energy storage of desired capacitance, an expected inductanceenergy storage calculation circuit, an expected load energy consumption calculation circuit, an expected total energy calculation circuit, an actual inductance energy storage calculation circuit, an actual capacitance energy storage calculation circuit, an actual load energy consumption calculation circuit, a load identification circuit, an actual total energy calculation circuit, an operation circuit, a controller circuit, and a PWM signal circuit. As that invention weaken the sensitivity of the dynamic performance of the output of the power supply to the value of the control parameter, the complexity of the controller parameter design is reduce, and the overshoot and oscillation phenomena of the voltage and the current are restrained, at the same time, the optimization of the dynamic adjustment time is realized.

An igniter is not provided with a depression IGBT and is configured such that a distance between a main IGBT and a sense IGBT is equal to or greater than 100 μm and equal to or less than 700 μm and preferably equal to or greater than 100 μm and equal to or less than 200 μm. The igniter is controlled such that, before the overcurrent of the main IGBT reaches a predetermined upper limit, a sense current of the sense IGBT is saturated. Therefore, it is possible to provide the igniter which has a small size and prevents the overshoot of a collector current of the main IGBT when a current is limited and an internal combustion engine ignition apparatus which includes the igniter, has a small size, and prevents an ignition error.

The invention disclosed a DAC (Digital-to-Analog Converter) technology based novel soft start circuit and a soft start method thereof. The novel soft start circuit comprises a clock generation module, a digital signal generator, a binary switch, an R-2R trapezoidal resistance network and a soft start end control module. According to the novel soft start circuit disclosed by the invention, a soft start voltage with a rising trend from gentle to steep and then from steep to gentle is generated by adopting the clock generation module on the basis of the DAC technology; a quiescent current of a numerical part circuit is zero, and integral power consumption is controlled within 2n W, and therefore, energy is greatly saved and the requirements of development are met; the electrifying overshoot of an inductive current is inhibited within 1.3 A in the process of soft start, and therefore the requirements of a system are met; the rising process of an output voltage is stable, and therefore, oscillation is prevented from appearing and needed voltage values are fast and stably reached; the response time of a power management IC (Integrated Circuit) in a start stage is furthest shortened and controlled at about 200 microseconds; and the response speed of the integral system is greatly increased, and therefore a circuit is more suitable for a high-speed work environment.

An electric power steering apparatus is provided, which includes a steering torque sensor for detecting steering torque exerted on a steering system, a motor for exerting assist steering torque on the steering system, a motor current sensor for detecting drive current of the motor, a target current setting section for determining target current to be supplied for the motor based on the steering torque, a feedback control section for executing feedback control based on a deviation between the target current and the drive current of motor and a feedforward control section for executing feedforward control based on the target current. The apparatus has a feature that gain of the feedforward control is adapted to be greater as the speed of a vehicle increases.

A boiling refrigerant type cooling system to suppress overshoot upon start of heat generation and realize stable start of boiling. In the boiling refrigerant type cooling system, a metal boiling heat transfer unit has a base in thermal contact with a heat generating body. The boiling heat transfer unit is in contact with a liquid refrigerant. The boiling heat transfer unit has plural parallel tunnels communicating with the outside via holes or gaps under its surface, a groove deeper than a tunnel diameter formed through all the tunnels in an orthogonal direction to the tunnels, and a cover plate on the groove.

To provide a capacity control valve for a variable displacement compressor of a Pd-Ps differential pressure-controlled type, which suppresses overshooting of the differential pressure between the discharge pressure Pd and the suction pressure Ps which can occur when the differential pressure is changed in response to a stepwise change in the solenoid current. The capacity control valve includes a valve section having a Pd-Pc valve for control of the flow rate of refrigerant flowing from a discharge chamber to a crankcase and a Pc-Ps valve for control of the flow rate of refrigerant flowing from the crankcase to a suction chamber operating in a manner interlocked with the Pd-Pc valve. A spool valve element is provided on a valve element of the Pc-Ps valve, whereby in a stroke region where the Pd-Pc valve is toward the fully-closed position, refrigerant is allowed to pass through the clearance between the spool valve element and the valve hole of the Pc-Ps valve, to cause the Pc-Ps valve to have a characteristic that the opening area thereof does not change in response to a change in stroke. This makes it possible to suppress sharp changes in the pressure Pc in the crankcase due to the existence of the clearance, even if the solenoid current is stepwise sharply changed.

Electric motor control is based on a target energization amount calculated using a braking operation member operation amount. A state quantity is acquired as an actual value, indicating an actual actuation state of a movable member located in a power transmission path from the electric motor to a friction member. Using the operation amount, it is determined whether or not inertia compensation control is necessary, which compensates for the inertia influence of a brake actuator during electric motor deceleration. “A target value corresponding to the actual value” is determined as a reference value, which is calculated based on the operation amount at a time when inertia compensation control is necessary. Based on the actual and reference values, “an inertia compensation energization amount for decreasing the target energization amount to compensate for the influence of inertia” is calculated, and the target energization amount is adjusted using the inertia compensation energization amount.

The invention discloses a method for inhibiting the overshoot of LDO output voltage, relates to the technical field of semiconductor integrated circuits, and solves the technical problem that a largecapacitor is required to be used for inhibiting the overshoot of LDO output voltage. According to the method, the output voltage of an LDO is acquired in real time through a voltage acquisition module, and the output voltage is converted into a feedback signal which can linearly change along with the output voltage; an output voltage control module is used for generating a control signal for representing the change of the output voltage based on the feedback signal, and the control signal is used for adjusting the control end of the LDO so as to inhibit overshoot voltage when the output voltage of the LDO contains the overshoot voltage. The invention also discloses a method for inhibiting the overshoot of LDO output voltage. According to the method and the system, the overshoot phenomenonof LDO output voltage can be effectively inhibited, the whole LDO does not need to adopt a large capacitor, the chip area is saved, meanwhile, the whole power consumption of the LDO for inhibiting voltage overshoot is small, and the energy is saved.

A Rankine cycle system includes: an evaporator for heating water with thermal energy of exhaust gas of an engine so as to generate steam; an expander for converting the thermal energy of the steam generated by the evaporator into mechanical energy; and a distribution device for manipulating the amount of water supplied to the evaporator in order to make the temperature of the steam supplied from the evaporator to the expander coincide with a target temperature. The distribution device controls a distribution ratio between the amount of water supplied to the entrance of the evaporator and the amount of water supplied to a portion partway along the evaporator, thereby suppressing an overshoot in the temperature of the gas-phase working medium due to a sudden increase in the thermal energy of the exhaust gas.

A filter device comprises a digital filter, a maximum / minimum detector circuit, and a limiter circuit. The digital filter includes unit delay elements chained together and having M stages (M is an integer equal to or larger than two) for shifting an n-bit (n is a positive integer) digital input signal; n multiplier circuits for multiplying output signals from the unit delay elements at the respective stages by predetermined filter coefficients, respectively; and adder circuits chained together and having (M−1) stages for summing output signals from the respective multiplier circuits to supply a filtered output signal. The maximum / minimum detector circuit detects a maximum value detection signal and a minimum value detection signal in the output signals supplied from the unit delay elements. The limiter circuit limits a minimum value of the filtered output signal based on the maximum value detection signal, and limits a minimum value of the filtered output signal based on the minimum value detection signal.

The invention relates to an underwater robot three-dimensional path visual tracking method. The invention belongs to the technical field of underwater robot three-dimensional path planning. Accordingto the method, a geodetic coordinate system, a carrier coordinate system and a curve coordinate system are established, a six-degree-of-freedom model of an underwater robot is established according tothe coordinate systems, a path tracking error model is established according to the established six-degree-of-freedom model of the underwater robot, and course angle deviation and submergence angle deviation are determined; three-dimensional path tracking is performed on the established six-degree-of-freedom model of the underwater robot by adopting a back-stepping sliding mode control method; and three-dimensional path tracking is trained by adopting a deep reinforcement learning method to complete three-dimensional path visual tracking of the underwater robot. According to the invention, the tracking error is continuous, and the path tracking stability is improved; an integral term is added into the conductivity of the sight method to introduce the influence of time; and a boundary reward function is added to accelerate the convergence of path tracking, the overshoot is reduced, and the precision is improved.

A valve timing control apparatus includes a phase varying mechanism arranged to vary a relative rotational phase of a cam shaft with respect to a crank shaft; a driving mechanism arranged to provide a driving force to the phase varying mechanism by energization; a control mechanism configured to control a current applied to the driving mechanism; and a phase angle sensing mechanism arranged to sense the relative rotational phase of the cam shaft with respect to the crank shaft, and to have a detection period longer than a control period of the control mechanism in accordance with an engine operating state. The control mechanism is configured to repeat increasing and decreasing of the current applied to the driving mechanism when the phase varying mechanism continuously varies the relative rotational phase of the cam shaft with respect to the crank shaft by a predetermined angle or more.

Provided is a voltage regulator that is low in current consumption and is capable of suppressing the occurrence of an excessive overshoot at an output terminal when a power supply voltage becomes high in a non-regulated state. The voltage regulator includes: an overshoot limiting circuit for detecting an occurrence of an overshoot in an output voltage and limiting a current of the output transistor; and a non-regulated state detection circuit for detecting a non-regulated state of the voltage regulator based on a voltage of an output terminal and a current flowing through the output transistor. The overshoot limiting circuit has an operating current controlled by a detection signal of the non-regulated state detection circuit.

When a voltage conversion operation is started, a control circuit (30) performs an operation to obtain a voltage command value for each control timing with setting a target voltage obtained based on a torque command value (TR) and a motor rotation number (MRN) as a final value, and controls a boost converter (12) so as to match an output voltage (Vm) with the voltage command value. The control circuit (30) has a prescribed threshold value set to be lower than the target voltage. The control circuit (30) controls the boost converter (12) with setting an absolute value of a rate of change between control timings to a first value until the voltage command value reaches the prescribed threshold value. When the voltage command value becomes at least the prescribed threshold value, the boost converter (12) is controlled with setting the absolute value of the rate of change to a second value smaller than the first value.