US 12,244,232 B2
Bidirectional DC converter, control method therefor, and control module thereof, and storage medium
Jianping Zhou, Shenzhen (CN); Qia Wang, Shenzhen (CN); Mingming Liu, Shenzhen (CN); Guoxian Lin, Shenzhen (CN); Ben E, Shenzhen (CN); and Yulong Cui, Shenzhen (CN)
Assigned to ZTE Corporation, Shenzhen (CN)
Appl. No. 18/013,497
Filed by ZTE Corporation, Shenzhen (CN)
PCT Filed Jun. 28, 2021, PCT No. PCT/CN2021/102783
§ 371(c)(1), (2) Date Dec. 28, 2022,
PCT Pub. No. WO2022/001966, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 202010605231.0 (CN), filed on Jun. 29, 2020.
Prior Publication US 2023/0344353 A1, Oct. 26, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/08 (2006.01)
CPC H02M 3/1586 (2021.05) [H02M 1/08 (2013.01)] 15 Claims
OG exemplary drawing
 
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−D11/K1<D2<1−D11/K2, where:
D11 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.