Electric power converter and driving apparatus

Patent metadata

Field	Value
Publication number	US-10389245-B2
Application number	US-201615576330-A
Country	US
Kind code	B2
Filing date	Sep 15, 2016
Priority date	Sep 16, 2015
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

An electric power converter including an electric-power conversion circuit that performs bidirectional conversion of a voltage between a DC power source and a motor and outputs the voltage, a first voltage detector that detects an inter-terminal voltage at the DC power source side of the electric-power conversion unit, a second voltage detector that detects an inter-terminal voltage at the motor side of the electric-power conversion unit, and a controller. The controller includes a first calculator that calculates a main duty, based on a target voltage and the inter-terminal voltage at the motor side, and a second calculator that calculates a sub-duty, based on the main duty, the inter-terminal voltage at the motor side, and the inter-terminal voltage, at the DC power source side, detected by the second voltage detection unit. The controller calculates a duty amount for operating the electric-power conversion unit, based on the main duty and the sub-duty.

First claim

The invention claimed is:

1. An electric power converter comprising:
an electric-power conversion circuit that performs bidirectional transmission of electric power between a first terminal and a second terminal;
a first voltage detector that detects an inter-terminal voltage of the first terminal of the electric-power conversion circuit;
a second voltage detector that detects an inter-terminal voltage of the second terminal of the electric-power conversion circuit; and
a controller that controls operation of the electric-power conversion circuit,
wherein the controller includes
a first calculator that calculates a main duty amount, based on a difference between a predetermined target voltage and the inter-terminal voltage, of the second terminal, that is detected by the second voltage detector, and
a second calculator that calculates an estimation voltage value of the inter-terminal voltage of the first terminal, based on the main duty amount calculated by the first calculator and the inter-terminal voltage, of the second terminal, that is detected by the second voltage detector, and then calculates a sub-duty amount, based on the estimation voltage value and the inter-terminal voltage, of the first terminal, that is detected by the first voltage detector, and

wherein the controller calculates a duty amount for operating the electric-power conversion circuit, based on the main duty amount and the sub-duty amount.

2. The electric power converter according to claim 1 , wherein the second calculator calculates the sub-duty amount, by multiplying a difference value between the estimation voltage value and the inter-terminal voltage, of the first terminal, that is detected by the first voltage detector by a variable coefficient determined based on the inter-terminal voltage, of the second terminal, that is detected by the first voltage detector and the inter-terminal voltage, of the first terminal, that is detected by the second voltage detector.

3. The electric power converter according to claim 1 , wherein the second calculator has a limiter that applies limiter processing to the sub-duty amount to limit a variable range of the sub-duty amount.

4. The electric power converter according to claim 1 , further comprising a current detector that detects a current flowing in a reactor provided in the electric-power conversion circuit, wherein the second calculator calculates the sub-duty amount, based on the current detected by the current detector.

5. The electric power converter according to claim 1 , wherein the electric-power conversion circuit performs bidirectional transmission of electric power between the first terminal and the second terminal, by use of a multi-level converter.

6. An electric power converter comprising:
an electric-power conversion circuit that performs bidirectional transmission of electric power between a first terminal and a second terminal;
a first voltage detector that detects an inter-terminal voltage of the first terminal of the electric-power conversion circuit;
a second voltage detector that detects an inter-terminal voltage of the second terminal of the electric-power conversion circuit; and
a controller that controls operation of the electric-power conversion circuit,
wherein the controller includes
a first calculator that calculates a main duty amount, based on the difference between a predetermined target voltage and the inter-terminal voltage, of the second terminal, that is detected by the second voltage detector, and
a second calculator that calculates a duty amount estimation value, based on the main duty amount calculated by the first calculator, and then calculates the sub-duty amount, based on the duty amount estimation value, the inter-terminal voltage, of the first terminal, that is detected by the first voltage detector, and the inter-terminal voltage, of the second terminal, that is detected by the second voltage detector,

wherein the controller calculates a duty amount for operating the electric-power conversion circuit, based on the main duty amount and the sub-duty amount.

7. The electric power converter according to claim 6 , wherein the second calculator includes a limiter that applies limiter processing to the sub-duty amount to limit a variable range of the sub-duty amount.

8. The electric power converter according to claim 6 , further comprising a current detector that detects a current flowing in a reactor provided in the electric-power conversion circuit, wherein the second calculator calculates the sub-duty amount, based on the current detected by the current detector.

9. The electric power converter according to claim 6 , wherein the electric-power conversion circuit performs bidirectional transmission of electric power between the first terminal and the second terminal, by use of a multi-level converter.

10. A driving apparatus including a DC power source, a motor, and an electric power converter, a first terminal of which is connected with the DC power source and a second terminal of which is connected with the motor,
wherein the electric power converter includes
an electric-power conversion circuit that performs bidirectional transmission of electric power between the DC power source and the motor,
a first voltage detector that detects an inter-terminal voltage at the DC power source side of the electric-power conversion circuit,
a second voltage detector that detects an inter-terminal voltage at the motor side of the electric-power conversion circuit, and
a controller that controls conversion operation of the electric-power conversion circuit;

wherein the controller includes
a first calculator that calculates a main duty amount, based on a predetermined target voltage and the inter-terminal voltage, at the motor side, that is detected by the second voltage detector, and
a second calculator that calculates a sub-duty amount, based on the inter-terminal voltage, at the DC power source side, that is calculated from the main duty amount calculated by the first calculator and the inter-terminal voltage, at the motor side, that is detected by the second voltage detector and the inter-terminal voltage, at the DC power source side, that is detected by the first voltage detector, and

wherein the controller calculates a duty amount for operating the electric-power conversion circuit, based on the main duty amount and the sub-duty amount.

Assignees

• Mitsubishi Electric Corp

Inventors

• Uenaka Mai
• Ikeda Matahiko
• Kondo Ryota

Classifications

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H02J7/24

  using discharge tubes or semiconductor devices · CPC title

• H02M3/1588

  comprising at least one synchronous rectifier element (H02M3/1582, H02M3/1584 take precedence) · CPC title

• H02P27/06

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title

• H02M1/38

  Means for preventing simultaneous conduction of switches · CPC title