Dead-time voltage compensation apparatus and dead-time voltage compensation method

Patent metadata

Field	Value
Publication number	US-10666131-B2
Application number	US-201816211551-A
Country	US
Kind code	B2
Filing date	Dec 6, 2018
Priority date	Oct 17, 2018
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

A dead-time voltage compensation apparatus and a dead-time voltage compensation method are provided. The method includes: converting a DC voltage of an input end of a single-phase DC-AC inverter into a unipolar AC voltage; calculating first to third current values based on a first inductor current value of a inductor, calculating first voltage compensation amounts of a first dead-time and a third dead-time of an AC voltage and a second inductor current value of the AC voltage based on polarities of the first to third current values, calculating fourth to sixth current values based on the second inductor current value, calculating second voltage compensation amounts of a second dead-time and a fourth dead-time of the AC voltage based on polarities of the fourth to sixth current values, and compensating a control reference signal of a processor based on the first and second voltage compensation amounts.

First claim

What is claimed is:

1. A dead-time voltage compensation apparatus, comprising: a single-phase DC-AC inverter having an input end, a first switching module, a second switching module and an inductor, wherein the first switching module and the second switching module convert a DC voltage of the input end into a unipolar AC voltage; and a processor connected to the single-phase DC-AC inverter and configured for calculating a first current value, a second current value and a third current value based on a first inductor current value of the inductor, calculating voltage compensation amounts of a first dead-time and a third dead-time of an AC voltage and a second inductor current value of the inductor based on polarities of the first current value, the second current value and the third current value, calculating a fourth current value, a fifth current value and a sixth current value based on the second inductor current value of the inductor, calculating voltage compensation amounts of a second dead-time and a fourth dead-time of the AC voltage based on polarities of the fourth current value, the fifth current value and the sixth current value, and compensating a control reference signal of the processor based on the voltage compensation amounts of the first dead-time, the second dead-time, the third dead-time and the fourth dead-time of the AC voltage, wherein during the first dead-time, the AC voltage is greater than zero and from a standard value to a high level value of the AC voltage; during the second dead-time, the AC voltage is greater than zero and from the high level value to the standard value of the AC voltage; during the third dead-time, the AC voltage is less than zero and from the standard value to a low level value of the AC voltage; and during the fourth dead-time, the AC voltage is less than zero and from the low level value to the standard value of the AC voltage, and wherein the first inductor current value and the second inductor current value of the inductor are actual signals, and the first current value to the sixth current value are derived values.

2. The dead-time voltage compensation apparatus of claim 1 , further comprising a sensor connected to the inductor of the single-phase DC-AC inverter and configured for sensing an inductor current of the inductor.

3. The dead-time voltage compensation apparatus of claim 1 , further comprising a sensor connected to the input end of the single-phase DC-AC inverter and configured for sensing a DC voltage at the input end.

4. The dead-time voltage compensation apparatus of claim 1 , further comprising a sensor connected to an output end of the single-phase DC-AC inverter and configured for sensing an output voltage at the output end.

5. The dead-time voltage compensation apparatus of claim 1 , wherein the processor comprises an output voltage controller configured for generating a control signal based on an output voltage of the single-phase DC-AC inverter and a command corresponding to the output voltage.

6. The dead-time voltage compensation apparatus of claim 5 , wherein the processor further comprises an output current controller configured for generating the control reference signal based on the control signal from the output voltage controller and an inductor current from the inductor of the single-phase DC-AC inverter.

7. The dead-time voltage compensation apparatus of claim 6 , wherein the processor further comprises a dead-time voltage compensator configured for generating the voltage compensation amounts of the first dead-time, the second dead-time, the third dead-time and the fourth dead-time of the AC voltage based on the inductor current, the DC voltage and the output voltage from the single-phase DC-AC inverter.

8. The dead-time voltage compensation apparatus of claim 7 , wherein the processor further comprises an adder configured for generating a compensated control reference signal based on the control reference signal from the output current controller and the voltage compensation amounts of the first dead-time, the second dead-time, the third dead-time and the fourth dead-time of the AC voltage from the dead-time voltage compensator.

9. The dead-time voltage compensation apparatus of claim 8 , wherein the processor further comprises a triangular wave generator configured for generating a triangular wave and an inverter configured for changing the compensated control reference signal to an inverted compensated control reference signal.

10. The dead-time voltage compensation apparatus of claim 9 , wherein the processor further comprises a first comparator configured for comparing positions of the compensated control reference signal and the triangular wave and a first dead-time generator configured for generating a dead-time to a first switch and a second switch of the single-phase DC-AC inverter based on the positions between the compensated control reference signal and the triangular wave relatively.

11. The dead-time voltage compensation apparatus of claim 10 , wherein the processor further comprises a second comparator configured for positions of the inverted compensated control reference signal and the triangular wave and a second dead-time generator configured for generating a dead-time to a third switch and a fourth switch of the single-phase DC-AC inverter based on the positions between the inverted compensated control reference signal and the triangular wave relatively.

12. A dead-time voltage compensation method, comprising: converting a DC voltage of an input end of a single-phase DC-AC inverter into a unipolar AC voltage by using a first switching module and a second switching module of the single-phase DC-AC inverter; calculating, by using a processor, a first current value, a second current value and a third current value based on a first inductor current value of an inductor of the single-phase DC-AC inverter, and calculating voltage compensation amounts of a first dead-time and a third dead-time of an AC voltage and a second inductor current value of the inductor based on polarities of the first current value, the second current value and the third current value; calculating, by using the processor, a fourth current value, a fifth current value and a sixth current value based on the second inductor current value of the inductor, and calculating voltage compensation amounts of a second dead-time and a fourth dead-time of the AC voltage based on polarities of the fourth current value, the fifth current value and the sixth current value; and compensating, by using the processor, a control reference signal of the processor based on the voltage compensation amounts of the first dead-time, the second dead-time, the third dead-time and the fourth dead-time of the AC voltage, wherein during the first dead-time, the AC voltage is greater than zero and from a standard value to a high level value of the AC voltage; during the second dead-time, the AC voltage is greater than zero and from the high level value to the standard value of the AC voltage; during the third dead-time, the AC voltage is less than zero and from the standard value to a low level value of the AC voltage; and during the fourth dead-time, the AC voltage is less than zero and from the low level value to the standard value of the AC voltage, and wherein the first inductor current value and the second inductor current value of the inductor are actual signals, and the first current value to the sixth current value are derived values.

13. The dead-time voltage compensation method of claim 12 , further comprising calculating, by using the processor, the first current value, the second current value and the third current value at the first dead-t

Assignees

• Ind Tech Res Inst

Inventors

• Konishi Yoshihiro
• Ho Yeh-Hsiang

Classifications

• H02M7/5395

  by pulse-width modulation · CPC title

• H02M7/53871 Primary

  with automatic control of output voltage or current · CPC title

• H02M7/53873

  with digital control · CPC title

• H02M1/12

  Arrangements for reducing harmonics from AC input or output · CPC title

• H02M1/38 Primary

  Means for preventing simultaneous conduction of switches · CPC title