Bidirectional DC converter, control method therefor, and control module thereof, and storage medium

Patent metadata

Field	Value
Publication number	US-12244232-B2
Application number	US-202118013497-A
Country	US
Kind code	B2
Filing date	Jun 28, 2021
Priority date	Jun 29, 2020
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

Disclosed are a control method for a bidirectional DC converter, a control module for a bidirectional DC converter, a bidirectional DC converter, and a non-transitory computer-readable storage medium. The control method includes: determining an operating mode of the bidirectional DC converter according to an input voltage and an output voltage; respectively determining a duty cycle of a drive signal of the first switch transistor, a duty cycle of a drive signal of the second switch transistor, a duty cycle of a drive signal of the third switch transistor, and a duty cycle of a drive signal of the fourth switch transistor according to the operating mode of the bidirectional DC converter; and providing drive signals to gates of the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor respectively.

First claim

What is claimed is:

1. A control method for a bidirectional DC converter, the bidirectional DC converter comprising at least one power conversion unit, the power conversion unit comprising a first bridge arm, a second bridge arm and an inductor, the first bridge arm comprising a first switch transistor and a second switch transistor, a first electrode of the first switch transistor being electrically connected to a positive electrode of an input terminal of the bidirectional DC converter, a second electrode of the first switch transistor being electrically connected to a first electrode of the second switch transistor, a second electrode of the second switch transistor being electrically connected to a negative electrode of the input terminal of the bidirectional DC converter, the second bridge arm comprising a third switch transistor and a fourth switch transistor, a first electrode of the third switch transistor being electrically connected to a negative electrode of an output terminal of the bidirectional DC converter, a second electrode of the third switch transistor being electrically connected to a first electrode of the fourth switch transistor, a second electrode of the fourth switch transistor being electrically connected to a positive electrode of the output terminal of the bidirectional DC converter, a first terminal of the inductor being electrically connected to the second electrode of the first switch transistor, and a second terminal of the inductor being electrically connected to the first electrode of the fourth switch transistor; the control method comprising:
determining an operating mode of the bidirectional DC converter according to an input voltage and an output voltage;
respectively determining a duty cycle of a drive signal of the first switch transistor, a duty cycle of a drive signal of the second switch transistor, a duty cycle of a drive signal of the third switch transistor, and a duty cycle of a drive signal of the fourth switch transistor according to the operating mode of the bidirectional DC converter; and
providing the drive signal to a gate of the first switch transistor according to the determined duty cycle of the drive signal of the first switch transistor, providing the drive signal to a gate of the second switch transistor according to the determined duty cycle of the drive signal of the second switch transistor, providing the drive signal to a gate of the third switch transistor according to the determined duty cycle of the drive signal of the third switch transistor, and providing the drive signal to a gate of the fourth switch transistor according to the determined duty cycle of the drive signal of the fourth switch transistor; wherein the duty cycle of the drive signal of the first switch transistor, the duty cycle of the drive signal of the second switch transistor, the duty cycle of the drive signal of the third switch transistor, and the duty cycle of the drive signal of the fourth switch transistor between the operating mode of the bidirectional DC converter satisfy a following relationship:
in response to the bidirectional DC converter operating in a Buck mode, a maximum value of the duty cycle of the drive signal of the first switch transistor is a first duty cycle threshold;
in response to the bidirectional DC converter operating in a Boost mode, a minimum value of the duty cycle of the drive signal of the third switch transistor is a second duty cycle threshold; and
in response to the bidirectional DC converter operating in a Buck/Boost mode, the duty cycle of the drive signal of the first switch transistor is a constant value, a differential between the first duty cycle threshold and the constant value does not exceed a predetermined differential, and the duty cycle of the drive signal of the third switch transistor satisfies:
1− D 11 /K 1< D 2 <1 −D 11 /K 2, where:

D 11 represents the constant value;
K1 represents a Buck coefficient of the bidirectional DC converter, 0.9≤K1<1; and
K2 represents a Boost coefficient of the bidirectional DC converter, 1<K2<1.1.

2. The control method of claim 1 , wherein the predetermined differential satisfies a following relation:
0<Δ≤0.05,

wherein Δ represents the predetermined differential.

3. The control method of claim 1 , wherein the determining an operating mode of the bidirectional DC converter according to an input voltage and an output voltage comprises:
sampling the input voltage and the output voltage respectively;
comparing the sampled input voltage with the sampled output voltage;
in response to Vo≤K1×Vin, determining the operating mode of the bidirectional DC converter to be the Buck mode;
in response to K1×Vin≤Vo≤K2×Vin, determining the operating mode of the bidirectional DC converter to be the Buck/Boost mode; and
in response to K2×Vin≤Vo, determining the operating mode of the bidirectional DC converter to be the Boost mode.

4. The control method of claim 3 , wherein in the determining an operating mode of the bidirectional DC converter according to an input voltage and an output voltage,
in response to the operating mode of the bidirectional DC converter being switched from the Buck mode to the Buck/Boost mode, determining the operating mode of the bidirectional DC converter to be the Buck mode in response to Vo<K1′×Vin, wherein K1′ represents a first hysteresis determination coefficient, and 0<K1′<K1; and
in response to the operating mode of the bidirectional DC converter being switched from the Boost mode to the Buck/Boost mode, determining the operating mode of the bidirectional DC converter to be the Buck/Boost mode in response to Vo<K2′×Vin, wherein K2′ represents a second hysteresis determination coefficient, and 1<K2′<K2.

5. The control method according to claim 1 , wherein the first duty cycle threshold is equal to K1, and the second duty cycle threshold satisfies a following relation:
D 2min =1−1/ K 2;

wherein, D 2min represents the second duty cycle threshold.

6. The control method according to claim 1 , wherein in response to the bidirectional DC converter operating in the Buck/Boost mode, the duty cycle of the drive signal of the third switch transistor satisfies a following formula:
Vo=(D 11 ×Vin)/(1−D 2 ), wherein D 2 represents the duty cycle of the drive signal of the third switch transistor, and D 11 represents the constant value.

7. A control module for a bidirectional DC converter, the bidirectional DC converter comprising at least one power conversion unit, the power conversion unit comprising a first bridge arm, a second bridge arm and an inductor, the first bridge arm comprising a first switch transistor and a second switch transistor, a first electrode of the first switch transistor being electrically connected to a positive electrode of an input terminal of the bidirectional DC converter, a second electrode of the first switch transistor being electrically connected to a first electrode of the second switch transistor, a second electrode of the second switch transistor being electrically connected to a negative electrode of the input terminal of the bidirectional DC converter, the second bridge arm comprising a third switch transistor and a fourth switch transistor, a first electrode of the third switch transistor being electrically connected to a negative electrode of an output terminal of the bidirectional DC converter, a second electrode of the third switch transistor being electrically connected to a first electrode of the fourth switch transistor, a second electrode of the fourth switch transistor being electrically connected to a positive electrode of the output terminal of the bidirectional DC converter, a first terminal of the inductor being electrically connected to the second electrode of the first sw

Assignees

• Zte Corp

Inventors

• Zhou Jianping
• Wang Qia
• Liu Mingming
• Lin Guoxian
• E Ben
• Cui Yulong

Classifications

• H02M1/08

  Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters · CPC title

• H02M1/0003

  Details of control, feedback or regulation circuits · CPC title

• H02M3/1584

  with a plurality of power processing stages connected in parallel · CPC title

• Y02B70/10

  Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes · CPC title

• H02M1/088

  for the simultaneous control of series or parallel connected semiconductor devices · CPC title