Information acquisition device and information acquisition method for pulsating voltage

Patent metadata

Field	Value
Publication number	US-12399200-B2
Application number	US-202318390320-A
Country	US
Kind code	B2
Filing date	Dec 20, 2023
Priority date	Nov 1, 2023
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

The present invention provides an information acquisition device and method for a pulsating voltage. The device uses a signal isolation circuit to receive a switch-controlling voltage of a motor driver and outputs a logic voltage. When a signal processing module receives the logic voltage from the signal isolation circuit, the signal processing module starts a counter and determines whether a rising or falling edge is present in the logic voltage. When determining that a first rising edge, a first falling edge, and a second rising edge are respectively present in the logic voltage, the signal processing module respectively stores a value of the counter as a first counter value, a second counter value, and a third counter value, and proceeds to calculate a voltage duty cycle of a motor-switching period based on the counter values. The present invention calculates the voltage duty cycle with improved accuracy.

First claim

What is claimed is:

1. An information acquisition device for a pulsating voltage, comprising:
a signal isolation circuit, utilized for receiving a switch-controlling voltage of a motor driver, and outputting a logic voltage based on the switch-controlling voltage of the motor driver; and
a signal processing module, electrically connected to the signal isolation circuit; wherein when the signal processing module receives the logic voltage from the signal isolation circuit, the signal processing module starts a counter, and determines whether a rising edge or a falling edge is present in the logic voltage;
wherein when the signal processing module determines that the rising edge is present in the logic voltage for a first time, the signal processing module stores a value of the counter as a first counter value;
wherein when the signal processing module determines that the falling edge is present in the logic voltage for a first time, the signal processing module stores the value of the counter as a second counter value, then resets the counter and starts the counter again;
wherein when the signal processing module determines that the rising edge is present in the logic voltage for a second time, the signal processing module stores the value of the counter as a third counter value;
wherein the signal processing module then calculates a voltage duty cycle of a motor-switching period based on the first counter value, the second counter value, and the third counter value.

2. The information acquisition device as claimed in claim 1 , wherein the signal processing module uses the following formula for calculating the voltage duty cycle:

D
=

2
⁢

(

C
2

-

C
1

)

2
⁢

C
2

+

C
3

-

C
1

wherein D represents the voltage duty cycle, C 1 represents the first counter value, C 2 represents the second counter value, and C 3 represents the third counter value.

3. The information acquisition device as claimed in claim 1 , wherein the signal processing module is utilized to receive a carrier voltage of a converter of the motor driver;
wherein the carrier voltage is periodic, and the signal processing module detects a maximum carrier voltage from the carrier voltage and proceeds to calculate an averaged voltage value needed for a motor model by multiplying the voltage duty cycle by the maximum carrier voltage.

4. The information acquisition device as claimed in claim 1 , wherein the signal isolation circuit stores an upper voltage threshold and a lower voltage threshold, with the upper voltage threshold being greater than the lower voltage threshold;
wherein when the switch-controlling voltage received by the signal isolation circuit is between the upper voltage threshold and the lower voltage threshold, the signal isolation circuit outputs the logic voltage that has been noise-filtered to the signal processing module.

5. The information acquisition device as claimed in claim 1 , further comprising:
a voltage divider, electrically connected to the signal isolation circuit; wherein when the voltage divider receives a motor-switch voltage from a converter of the motor driver, the voltage divider divides the motor-switch voltage into the switch-controlling voltage of a lower voltage value, and the voltage divider outputs the switch-controlling voltage to the signal isolation circuit.

6. The information acquisition device as claimed in claim 1 , wherein the signal processing module is an enhanced capture module within a digital signal processor.

7. An information acquisition method for a pulsating voltage, executed by a signal processing module, and comprising the following steps:
when receiving a logic voltage from a signal isolation circuit, starting a counter, and determining whether a rising edge or a falling edge is present in the logic voltage;
when determining that the rising edge is present in the logic voltage for a first time, storing a value of the counter as a first counter value;
when determining that the falling edge is present in the logic voltage for a first time, storing the value of the counter as a second counter value, then resetting the counter and starting the counter again;
when determining that the rising edge is present in the logic voltage for a second time, storing the value of the counter as a third counter value; and
calculating a voltage duty cycle of a motor-switching period based on the first counter value, the second counter value, and the third counter value.

8. The information acquisition method as claimed in claim 7 , wherein the step of calculating the voltage duty cycle of the motor-switching period based on the first counter value, the second counter value, and the third counter value uses the following formula to calculate the voltage duty cycle:

D
=

2
⁢

(

C
2

-

C
1

)

2
⁢

C
2

+

C
3

-

C
1

wherein D represents the voltage duty cycle, C 1 represents the first counter value, C 2 represents the second counter value, and C 3 represents the third counter value.

9. The information acquisition method as claimed in claim 8 , further comprising the following steps:
receiving a carrier voltage from a converter of a motor driver, wherein the carrier voltage is periodic;
detecting a maximum carrier voltage from the carrier voltage; and
calculating an averaged voltage value needed for a motor model by multiplying the voltage duty cycle by the maximum carrier voltage.

10. The information acquisition method as claimed in claim 7 , wherein the signal isolation circuit stores an upper voltage threshold and a lower voltage threshold, with the upper voltage threshold being greater than the lower voltage threshold;
wherein when a switch-controlling voltage received by the signal isolation circuit is between the upper voltage threshold and

Assignees

• Univ Nat Taiwan

Inventors

• Chen Yaow-Ming
• Chang Chia-Chou
• Chen Zhen-Jia

Classifications

• G01R19/003

  Measuring mean values of current or voltage during a given time interval · CPC title

• G01R19/0053 Primary

  Noise discrimination; Analog sampling; Measuring transients (measuring characteristics of individual pulses G01R29/02; digital sampling G01R19/2509; measuring noise figure G01R29/26) · CPC title

• G01R31/343

  in operation · CPC title

• G01R19/2509

  Details concerning sampling, digitizing or waveform capturing · CPC title

• G01R19/255 Primary

  using analogue/digital converters of the type with counting of pulses during a period of time proportional to voltage or current, delivered by a pulse generator with fixed frequency · CPC title