JP2011200103A5

JP2011200103A5 -

Info

Publication number: JP2011200103A5
Application number: JP2010285896A
Authority: JP
Filing date: 2010-12-22
Publication date: 2013-04-04

Claims

Power switching that has a plurality of series circuits in which a DC terminal for receiving DC power, a switching element that acts as an upper arm, and a switching element that acts as a lower arm are connected in series and receives DC power and outputs AC power A circuit, an AC terminal for outputting AC power, a driver circuit for controlling a switching operation of a switching element included in the power switching circuit, and a control circuit for controlling the driver circuit,
In the power switching circuit, a plurality of the series circuits are respectively connected in parallel to the DC terminal, and an alternating current generated at a connection portion between the switching element acting as the upper arm and the switching element acting as the lower arm A voltage is applied to the AC terminal,
The control circuit generates a signal for controlling the switching operation of the switching element by a PWM method in one operation region where the frequency of the AC power to be output is low, and supplies the signal to the driver circuit.
The control circuit performs a switching operation of the switching element at a timing based on a phase of the AC power to be output in an operation region where the frequency of the AC power to be output is higher than the operation region of the first. Generating a signal to control and supplying it to the driver circuit;
The power conversion device, wherein the driver circuit controls a switching operation of the switching element based on a signal from the control signal.

In the state where the switching operation of the switching element is controlled at a timing based on the phase of the AC power to be output in the power conversion device according to claim 1.
The power switching circuit generates three-phase AC power having a U phase, a V phase, and a W phase,
In order to generate an AC voltage between the phases, the driver circuit supplies a signal indicating switching timing based on π based on the phase angle of the AC voltage from zero to the power switching circuit, and from the phase angle of zero A power converter that supplies a signal representing the same switching timing as the switching timing based on π to the power switching circuit at a phase angle of π to 2π.

In the state where the switching operation of the switching element is controlled at a timing based on the phase of the AC power to be output in the power conversion device according to claim 1.
In the first harmonic removal control in which there are a plurality of types of harmonics to be removed, the control circuit outputs a first signal for controlling a switching operation per half cycle of an AC waveform determined based on the harmonics to be removed. Generated and supplied to the driver circuit,
The control circuit performs switching operation per half cycle of an AC waveform determined based on the harmonics to be removed in the second harmonic removal control in which the types of harmonics to be removed are larger than those in the first harmonic removal control. A second signal to be controlled is generated and supplied to the driver circuit;
Due to the control of the driver circuit, the power switching circuit switches the number of switching times per half cycle of the second harmonic elimination control more than the number of switching times per half cycle by the first harmonic elimination control. An electric power converter characterized by performing an operation.

A three-phase full-bridge type power conversion means provided with switching elements for the upper arm and the lower arm, and a controller that outputs a drive signal to the switching elements of each phase are supplied from a DC power source. A power converter that converts a voltage into an output voltage shifted by 2π / 3 rad in electrical angle by a switching operation of the switching element according to the drive signal, and supplies the output voltage to a three-phase AC motor,
A first period in which the upper arm switching element and the lower arm switching element are turned on in different phases to supply current from the DC power source to the motor; and the upper arm switching element in all phases Alternatively, an HM control mode in which any one of the switching elements for the lower arm is turned on and a second period in which torque is maintained with energy stored in the motor is alternately formed according to an electrical angle;
A sine wave PWM control mode in which the switching element is turned on in accordance with a pulse width determined based on a comparison result between the sine wave command signal and the carrier wave and current is supplied from the DC power supply to the motor;
Is switched based on a predetermined condition.

The power conversion device according to claim 4,
A power converter that switches between the HM control mode and the sine wave PWM control mode based on a rotation speed of the motor.

The power conversion device according to claim 4 or 5,
The HM control mode further includes a rectangular wave control mode in which the switching element of each phase is turned on and off once for each rotation of the motor.

The power conversion device according to claim 6, wherein
In the HM control mode, the harmonic component of the alternating current flowing through the motor is set to a desired value by changing at least one of the electrical angle position forming the first period and the length of the first period. Change
A power conversion device that shifts to the rectangular wave control mode by a change in the harmonic component.

In the power converter device according to any one of claims 4 to 7,
Transient current compensation means for outputting a compensation pulse for compensating a transient current generated in an alternating current flowing through the motor;
The power converter according to claim 1, wherein the transient current compensation means outputs the compensation pulse when switching between the HM control mode and the sine wave PWM control mode.

The power conversion device according to claim 8, wherein
The transient current compensation means outputs the compensation pulse when a predetermined condition is satisfied instead of or in addition to the switching between the HM control mode and the sine wave PWM control mode. Power conversion device.

In the power converter device as described in any one of Claims 4-9,
Determining means for determining whether or not the rotation state of the motor can be detected;
Chopper control for outputting a predetermined one-phase chopper control signal for alternately forming the first period and the second period in each phase regardless of the electrical angle based on the determination result by the determination means. And a power converter.

The power conversion device according to claim 10,
The period of the one-phase chopper control signal is determined according to the inductance of the motor.