NPWM PATENT FREE DOWNLOAD

At block the PWM generation module uses this measured duty ratio and duration to alter the duty ratios and durations of the output PWM cycle for the non-leading output PWM signals - so as to match the leading output PWM cycle Here, the forced commutation signal FC is a pulse identical in shape with the self-commutation signal SC. At every generation of the self-commutation signal SC, the self-commutation signal SC is first received and surely selected as the commutation signal CS by the selection circuit 71 , likewise the above-described Embodiment 1. Here, the self-commutation signal SC is a rectangular pulse with a constant, short pulse width. The waveform generator includes pulse width modulator which inputs the VA signal and the VPWM signal which is a triangular wave used as a reference input to all of the pulse width modulator circuits and output from the phase detector and VCO circuit For example, the period of the phase current is equal to 6 times of the short period TA of the forced commutation signal FC, and the duration of increase or decrease of the phase current is equal to A constant amount of the V-phase current Iv flows in the sink direction.

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The obstruction to the accurate detection of the zero crossing obstructs improvement in the reliability of the paent control, and, in particular, obstructs an increase in the torque produced in the sensorless motor. Accordingly, three output signals IC 1IC 2and IC 3 of the current comparing section 13 indicate the differences between the output current I of the output circuit 3 and the desired values of the three phase currents Iu, Iv, and Iw, respectively. Synchronous driving method for inductive load and synchronous controller for h-bridge circuit.

Thus the discontinuity will occur earlier and become better centered around the zero crossing. Furthermore, ripples caused by the PWM control have to be reliably masked since they reduce the accuracy of the zero crossing detection.

System and method for transient-based motor speed estimation with transient excitation. A sensorless motor driving method according to a first aspect of the present invention comprises the steps of:. A prescalar signal is output from the prescalar counter circuit and input to the RCEN generator Accordingly, for purposes of the following description, assertions of the SYNC signal indicating the frame timing serve as synchronization events to which the PWM signal generator is synchronized.

Furthermore, the levels of the increasing torque instruction TQ 1 and the decreasing torque instruction TQ 2 may be continuously changed. The system of claim 14wherein: These are phase detector enable signals. It will be recognized that some or all of the Figures are schematic representations for purposes of illustration and do not necessarily depict the actual relative sizes or locations of the elements shown.

Accordingly, the zero crossing detection is hardly maintained with high accuracy.

Control device for new energy automobile motor with remote data monitoring function and method thereof. Especially at the zero crossing, the rotor position agrees with either of six positions predetermined at intervals of 60 degrees pxtent electrical angles; 0, 60,and degrees in FIG.

Phase-shift detection device, motor drive device, brushless motor, and phase-shift detection method. Accordingly, the waveform of the phase currents Iu, Iv, and Iw are established, based on the patrnt interval T 2 of the self-commutation signal SC.

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In npdm energization phase, the BEMF Vu, Vv, or Vw causes a zero crossing at the non-energized motor coil, that is, the motor pahent to which the output circuit 3 does not apply the driving voltage. The electric vehicle as claimed in claim 7, said motor control means, wherein said control module has an interrupt nesting. The pre-drive circuit 2 changes the power transistor under the on-off control at every reception of the energization phase switching signal CP, and thereby, changes the states of the phase currents Iu, Iv, and Iw in order of I—VI shown in FIG.

Thereby, the rising rate of the phase current is maintained more than a constant rate at the switching between the energization phases. The position signal generation circuit activates the BEMF detection signal DZC in patdnt with the rising edge of the pulse having a fixed number of the position signal PS, for example, the pulse No.

As described above, the sampling module can refresh the sample parameters with each input PWM cycle or with every Xth input PWM cycle, or the sampling module can refresh the sample parameters in response to a stimulus event, such as expiration of a timer or generation of an interrupt.

Still, the class control is similar to that of Fig. Preferably, the control circuit can control the mode of operation of the power amplifier in response to at least one of: The energization control and the following changes of energization state in the energization phases III and V are similar to the above-described energization control and changes of energization state in the energization phase I.

Preferably, the control circuit 4 operates as a common-mode control.

CN103904974A - Motor control device of electric car - Google Patents

Thereby, the motor echo noises are suppressed since the phase currents are controlled to be shaped into a gentle waveform. The range of this control is limited and the efficiency of the class-S modulator is of concern as the total efficiency will depend pahent it. The PWM disable period is established at the constant period immediately before the zero crossing patnet as described above, in the sensorless motor driving device according to Embodiment 1 of the present invention.

In parent embodiment, the first signal generation unit is to initiate generation of a PWM cycle for the first set of intermediate PWM signals responsive to an assertion of a first signal and the first signal generation unit is to assert a second signal responsive to completing generation of the PWM cycle for the first set, the second signal generation unit is to initiate generation of a PWM cycle for the second set of intermediate PWM signals responsive to the assertion of the second signal and the second signal generation unit is to assert a third signal responsive to completing generation of the PWM cycle for the second set, and the third signal generation unit is to initiate generation of a PWM cycle for the third set of intermediate PWM signals responsive to the assertion of the third signal and the third signal generation unit is to assert the first signal responsive to completing generation of the PWM cycle for the third set.

In the conventional sensorless motor driving device, the position-detection mask signal MZC is maintained active for the predetermined time at every switching between the energization phases, that is, every generation of the commutation signal CS. In particular, there is a high possibility that the period of the first signal is much shorter than the actual period of the rotor rotation.

Npwm patent download

Such solutions are possible to integrate on-chip, but a large chip area is required to implement resonant loads with integrated inductors and capacitors.

Using the BEMF, the detection of the rotor position is performed without a position sensor. As a result, the zero crossing detection is maintained with high accuracy, regardless of the revolving speed of the rotor.