10 results about "Dead time compensation" patented technology

The application discloses a kind of bridge arm dead time compensation method, comprising: bridge arm dead time acquisition and calibration;Read current capture value;Obtain compensation deviation;Calculate compensation value;Read the duty cycle of each phase captured by MCU, the output of each phase at corresponding K-2 moment on the duty cycle obtained;Judge whether the duty cycle of each phase captured is zero;If it is zero, compensation is not needed;If it is not zero, subtract the PWM capture value of the phase K period from the PWM output value of the phase k-2 period saved, then add the specified compensation calibration correction value, to calculate the dead time compensation value of the phase;The PWM output value of the desired certain phase is added to the compensation deviation of the phase after measurement calibration to obtain the output value after compensation, and the maximum and minimum of the output value after compensation are limited according to the design rule.The present application realizes dead time compensation based on actual duty cycle back sampling to reduce the torque fluctuation of brushless motor, and can meet the torque fluctuation requirement of brushless motor control.

The present invention relates to a method, system and device for suppressing non-linear errors in the dead time of pulse width modulation. The method includes: obtaining delay characteristic data and PWM signal parameters of a switching device in a target circuit, and performing initialization parameter configuration to obtain initial configuration parameters; obtaining real-time current data of the target circuit, comparing and compensating it with the initial configuration parameters to obtain a dynamic compensation interval; obtaining the actual conduction state of the switching device, adjusting the dead time according to the dynamic compensation interval for the actual conduction state to obtain a critical safety dead time value; performing duty cycle correction based on the critical safety dead time value and the dynamic compensation interval to obtain a directional compensation amount; verifying the waveform harmonic distortion degree and dynamic response of the directional compensation amount and the initial configuration parameters to obtain a dead time compensation control strategy. The present invention can more accurately evaluate the dead time requirements under actual working conditions and improve the accuracy of dead time compensation.

Method for dead-time compensation in a converter (9) with at least one phase for the power supply of an electric drive (8), wherein the converter (9) has a control loop (1) for the current of the at least one phase and an observer (12) operating in parallel to the control loop (1), by which an observer actual value (13) for the current is calculated on the basis of an observer model (11) without the occurrence of a dead time, and to compensate the disturbance variable (10) caused by the dead time in the control loop (1), a compensation value for the control is formed from a control deviation (14) multiplied by a gain coefficient value (K), wherein the control deviation (14) consists of the difference between the actual current value of the control loop (1) and the observer actual value (13) of the current, characterized in that the gain coefficient value (K) depends on the control deviation (14) in a characteristic curve (16).

The invention relates to an energy storage converter harmonic wave and double frequency suppression method. By sampling the inductive current output by the DC / AC converter, dead time compensation is carried out, low-order harmonics in the output voltage can be reduced, and the quality of output electric energy is improved. Band elimination filtering is performed on voltage sampling feedback of the DC / DC converter, so that the output DC capacitor of the DC / DC converter bears frequency doubling power, the power fluctuation of an energy storage element is reduced, the service life of the energy storage element can be prolonged, the loss of the energy storage converter is reduced, and the performance and the power density of the energy storage converter are improved.

The invention discloses a control method of a dual-active bridge converter, a controller, a power supply, a device and a medium. The method comprises the following steps: acquiring an input voltage, an output voltage, a switching period and a turn ratio of a transformer; determining an input-output voltage ratio of the dual-active bridge converter; calculating to obtain a transmission power per unit value of the dual-active bridge converter; calculating to obtain an initial phase shift value of the dual-active bridge converter; setting the dead zone time of the dual-active bridge converter; compensating the initial phase shift value to obtain a target phase shift value; and generating a driving signal based on the target phase shift value to control the primary side full-bridge circuit and the secondary side full-bridge circuit. According to the method, non-ideal factors are fully considered, the problem of voltage abnormity during light-load or zero-power transmission is effectively avoided through dead-zone compensation, the reliability and control precision of the system are improved, the control logic of bidirectional power flow is simplified, and the method has high engineering practical value. The dual-active bridge converter is suitable for various types of dual-active bridge converters, and the application scene is wide.

The present invention relates to a standstill auto-tuning method for a motor, comprising the steps of: a) calculating a prediction error by using a voltage command, current input to the motor, and a computed coefficient vector; b) computing a coefficient vector of a next cycle by using the calculated prediction error; c) computing each of the dead time compensation time and motor parameters by using the coefficient vector acquired in step b); and d) calculating a compensation voltage command by applying the computed dead time compensation time to the voltage command.

The invention relates to the field of servo control, and provides a method and a device for determining a dead time compensation value of an inverter. The method comprises the following steps: determining a three-phase current instruction in a current control loop of the servo system and an actually measured dead zone characteristic curve corresponding to an inverter in the servo system; determining a dead-zone time compensation value of the inverter based on the three-phase current instruction and the actually measured dead-zone characteristic curve; and determining a dead-zone compensation coefficient, and determining a final dead-zone time compensation value based on the dead-zone compensation coefficient and the dead-zone time compensation value. According to the method and the device, the error compensation phenomenon can be avoided to the greatest extent, and the accuracy of dead time compensation is effectively improved.

A method for operating an inverter for a brushless direct current (BLDC) motor includes: driving a high-side switch to conduct current between a DC high node and an output node connected to the BLDC motor for a conducting period in each of a plurality of operating periods; driving a low-side switch to a conducting state after a dead time following the conducting period and to conduct current between the output node and a DC low node; receiving a duty cycle command; determining a matched duty cycle representing the conducting period as part of an operating period; determining a duty cycle difference signal as a difference between an initial duty cycle based on the duty cycle command and the matched duty cycle; and determining a feedback duty cycle offset signal based on the duty cycle difference signal.The adjusted duty cycle is calculated based on the feedback duty cycle offset signal.

The invention discloses a motor inverter dead time adaptive adjustment method for suppressing electromagnetic vibration noise, and relates to the technical field of motor vibration noise control, and the method comprises the steps: constructing an error voltage model based on dead time; according to the current rotating speed of the motor, adopting an error voltage model to obtain current harmonics in the phase current; radial electromagnetic force is obtained according to the current harmonics and correspondingly generated air gap flux density; determining a vibration response amplitude according to the radial electromagnetic force amplitude, and comparing the vibration response amplitude with a preset vibration threshold; and when the vibration response amplitude is greater than the vibration threshold, determining a target dead zone time and a dead zone compensation amount according to different current rotating speeds of the motor so as to adjust the dead zone of the inverter. The dead time and the dead time compensation amount of the inverter are adaptively adjusted according to the operation conditions, and the problems of current harmonics, electromagnetic force fluctuation and increase of electromagnetic vibration amplitude caused by fixed dead time of the inverter under different operation conditions are solved.

A method of operating an inverter for a brushless direct current (BLDC) motor includes driving a high side switch in each of a plurality of operating cycles to conduct current between a DC high node and an output node connected to the BLDC motor and for a conduction cycle; driving a low side switch to an on state after a dead time after the on period to conduct current between the output node and a DC low node; receiving a duty cycle command; determining, as part of an operating period, an adjusted duty cycle representing the on-period; determining a duty cycle difference signal as a difference between an initial duty cycle based on the duty cycle command and the adjusted duty cycle; and determining a feedback duty offset signal based on the duty difference signal. The adjusted duty cycle is calculated based on the feedback duty cycle offset signal.