Huawei Technologies Co., Limited

Huawei Digital Power Technologies Co., Ltd.

Other

Qinghai Wang

Dan Yang

Yongfa Zhu

Jiebin Cheng

Zhengyan He

Yuliang Lu

Hongbo Zhang

Hongting Luo

Xiaosong Liu

Yu Ding

Shiqing Li

Yongjun Dai

Yangli Dai

Pingfang Yu

Qiong Ye

Fulong Guo

The converter includes a primary-side winding, a secondary-side winding, a resonant inductor, a resonant capacitor, and a noise suppression network. The primary-side winding and the secondary-side winding form a transformer. The noise suppression network is connected between a primary-side quiescent point and a secondary-side quiescent point. The primary-side quiescent point is a direct current stable potential at an input terminal of the DC/DC converter. The secondary-side quiescent point is a direct current stable potential at an output terminal of the DC/DC converter. A first parasitic capacitance between a first terminal of the primary-side winding and the secondary-side quiescent point is equal to a second parasitic capacitance between a second terminal of the primary-side winding and the secondary-side quiescent point. A suppression current is generated by the noise suppression network, and has a direction opposite to a direction of a total noise current generated by the resonant inductor.

DC/DC converter and communication power supply with common mode noise suppression

A transformer and a switch-mode power supply are provided. The transformer includes: a magnetic core structure; several windings that surround a same magnetic cylinder in the magnetic core structure in a stacked manner, where the several windings include at least one primary-side winding and at least one secondary-side winding; and an electromagnetic shielding layer that is disposed between at least two adjacent windings, where the two adjacent windings are a primary-side winding and a secondary-side winding, and the electromagnetic shielding layer is made of a magnetic material. The electromagnetic shielding layer of the transformer can suppress a noise current of the winding, to reduce noise.

Transformer and switch-mode power supply

Embodiments of the present disclosure disclose a power converter and a related system. The power converter includes a controller and a power conversion circuit. The power conversion circuit is configured to convert an input power of an input power supply into an output power of a load, where the input power supply is an external power supply connected to the power converter. The controller is configured to control on/off of the first switch element, to implement connection/disconnection between the input power supply and the inductive element; and control the unidirectional conduction circuit to be turned on before the first switch element is turned on in the power conversion cycle.

Power converter and related system

A self-adaptable recharger includes a control circuit connected to a power-supply circuit, a current-sampling circuit and a pulse-based recharge circuit. The control circuit includes a microprocessor. The pulse-based recharge circuit includes parallel recharge branches each under control of a pin of the microprocessor. The microprocessor receives voltage-related and current-related signals from each of the recharge branches and compares the same with basic data stored therein to determine the types of batteries. The microprocessor calculates time-related changes in the voltage-related and current-related signals and a voltage difference between positive and zero pulses to determine the recharge status and correct recharging curves accordingly. The microprocessor determines the highest recharge voltage, a positive slope of voltage, a zero gain of voltage, a negative gain of voltage and a capacity gain to determine an energy level in each of the batteries and stops the recharge when the battery is full.

Self-adaptable recharger

An interface circuit and a communication device are provided. The interface circuit includes a transformer unit, a protection unit, and an interface unit. A secondary side of the transformer unit is connected with a chip. A first terminal of the protection unit is electrically connected with a center tap of a primary side of the transformer unit, and a second terminal of the protection unit is grounded. A first access terminal of the interface unit is connected with a first port of the primary side of the transformer unit, a second access terminal of the interface unit is connected with a second port of the primary side of the transformer unit, and a third access terminal and a fourth access terminal of the interface unit are electrically connected with the first terminal of the protection unit respectively.

Interface circuit and communication device

Growing community of inventors

Shenzhen, China

Qinghai Wang