Hong Kong Applied Science and Technology Research Institute Company, Limited

Zte Corporation

Kun Wu

Ziyang Gao

Danting Xu

Minglu Xia

A power-converter module has a switching Printed Circuit Board (PCB) with power transistors that generate heat. Ground, an input power supply, and an output power supply to the power transistors connect through metal traces on the switching PCB directly to interposer heat sinks that are soldered between the switching PCB and a system PCB. The metal traces and interposer heat sinks carry both supply or ground currents and heat away from the power transistors. These power and ground currents continue from the interposer heat sinks to the system PCB through direct solder joints between the system PCB and the interposer heat sinks. An interposer PCB has a same thickness as the interposer heat sinks and carries control signals from the system PCB to the switching PCB, bypassing the interposer heat sinks. The interposer heat sinks have an interposer portion soldered between the PCBs and fins beyond the switching PCB footprint.

Power converter package with thermally enhanced interposers to cooling fins

An active filter reduces Electro-Magnetic Interference (EMI) created by current flowing through a power line. The active filter connects to the power line at a single node through a connection capacitor. A sense current flows through the connection capacitor when the power line current changes. This sense current is applied to a gain control circuit having cross-coupled PNP transistors that drive currents to both terminals of a variable capacitor. The variable capacitor converts these currents to a voltage that is injected back into the power line through the connection capacitor as an injected compensation voltage that compensates for the sensed current.

Active filter for electromagnetic interference (EMI) reduction using a single connection point and a negative impedance converter with cross-coupled transistors

A wireless power transmitter has electromagnets and a transmitter coil mounted on a moving plate. Current in the main DC circuit is switched into the electromagnets by transistors that control the amount and direction of current through the electromagnets to control the strength and polarity of electromagnetic fields generated by the electromagnets. A controller initially drives a high gate voltage onto transistors to cause the electromagnets on the transmitter to generate a maximum attractive force with magnets on the receiver, causing the moving plate to move the transmitter coil into closer alignment with the receiver coil. A power factor is measured on both receiver and transmitter to estimate the power transfer efficiency. The controller then reduces the gate voltage by a step size and the power factors are measured again. The gate voltage continues to be adjusted to optimize the power transfer efficiency until reaching a maxima.

Self-aligning wireless power transfer system that switches power current into aligning electromagnets

An active filter reduces Electro-Magnetic Interference (EMI) created by current flowing through a power line. The active filter connects to the power line at a single node through a connection capacitor. A sense current flows through the connection capacitor when the power line current changes. This sense current is applied to a non-inverting input of an op amp to drive a power amplifier circuit through a filter capacitor. The power amplifier circuit increases the current drive of the op amp to charge a transfer capacitor that converts the power amplifier output current to a transfer voltage. The transfer capacitor is connected to the connection capacitor so that the transfer voltage is injected back into the power line through the connection capacitor as an injected voltage that compensates for the sensed current. Op amp gain is adjustable by variable resistors that connect to the inverting input of the op amp.

Active filter for electromagnetic interference (EMI) reduction using a single connection point and a negative impedance converter

Example embodiment is a power converter that adopt a 3D structure to increase the power density and improve thermal performance. The power converter includes a bottom substrate and at least one side substrate. Both the bottom substrate and the side substrate are rigid. Each side substrate is connected with the bottom substrate by a flexible substrate and forms an angle with the bottom substrate. The bottom substrate is further electrically connected with a plurality of surface mounting devices which are rigid. The flexible substrate provides electrical connection between the bottom substrate and the side substrate.

Power converter

A method and a device for modifying and forwarding a message in a data communication network are described. The method includes: description information of a message head is extracted as message descriptor information, and message fragments except the message descriptor information are stored; a pre-stored message modification description table is searched for modification parameters used for a message modification according to the message descriptor information; a needed message modification action is determined according to the obtained modification parameters, and the message fragments with a requirement of modification are modified in groups according to the types of actions; and the message fragments are distributed and reassembled according to port numbers, the message fragments are re-spliced into a complete message, and the message is sent to an external interface in time sequence. By modifying a pre-stored message modification description table through an external interface to add, alter or delete message modification parameters, the method and the device provided herein meet the demands for different kinds of services, greatly decrease the workload of design and reduce maintenance time, cost and complexity.

Growing community of inventors

Shenzhen, China

Kun Wu