Delta Electronics (shanghai) Co., Ltd

Delta Electronics, Inc.

Kai Dong

Bing Fan

Yucai Zhao

Liangsong Che

Junlai Huang

Jinfa Zhang

Tao Wei

Yichao Wang

Hongming Li

Jin-Fa Zhang

Shuai-Lin Du

Yuesen Guo

Mingjuan Zhang

Shuailin Du

Yuhua Hu

Donglin Fu

Jun Yang

Peter Mantovanelli Barbosa

Zhongwei Ke

Yong Huang

Hai-Jun Yang

Yuri Panov

Zhong-Wei Ke

Kunpeng Wang

Yihua Chang

Yi-Chao Wang

Li Zhu

Dongyu Wang

Weibo Sun

In the present disclosure, the multi-level AC/DC conversion circuit and the multi-level DC/DC conversion circuit calculate the duty ratio of synchronous rectification switch according to the input voltage, the output voltage, the interval time of turning on the main switch, the switching cycle and the duty ratio of main switch, thereby eliminating the need for additional zero-current detecting function or zero-crossing detection circuit in conventional AC/DC conversion circuits. Accordingly, for the multi-level AC/DC conversion circuit and the multi-level DC/DC conversion circuit of the present disclosure, the cost is reduced, and the reliability is enhanced.

Multi-level AC/DC conversion circuit, multi-level DC/DC conversion circuit and control methods thereof

A multi-level conversion circuit and a control method for flying capacitor voltage thereof are provided. In the multi-level conversion circuit, each flying capacitor is connected between a common connection node of the lower switches connected therewith and a common connection node of the upper switches connected therewith. When the conversion circuit works in a DCM, the control method includes steps of: (a) determining the main switch and synchronous rectification switch of the lower and upper switches; (b) acquiring an adjustment value corresponding to each flying capacitor; and (c) adjusting a duty ratio of the main switch according to the adjustment value corresponding to the flying capacitor connected therewith, wherein the adjustment trend of the duty ratio under D<(N−2)/(N−1) is opposite to that under (N−2)/(N−1)<D≤1, and D is the duty ratio before the adjustment.

Multi-level conversion circuit and control method for flying capacitor voltage thereof

Electrical connector

A high-density power supply includes a shell, a fan, a PFC module, a DC-DC module and a main board. The shell has a first air passage and a second air passage arranged side by side. The fan is arranged on an inner side or an outer side of the shell. The PFC module includes a PFC inductor arranged in the first air passage, and the PFC inductor faces directly to the fan. The DC-DC module is arranged in the first air passage. The DC-DC module includes at least one DC-DC conversion circuit, each of the DC-DC conversion circuits includes a first PCB and a transformer magnetic core, a transformer winding and power components arranged on the first PCB. The main board is arranged within the shell. The PFC inductor and the at least one DC-DC conversion circuit are electrically connected with the main board, respectively.

High-density power supply

A totem pole power factor correction circuit includes a detection module and a control unit. The detection module includes a first detection resistor and a first detection circuit. After a voltage difference between the two terminals of the first detection resistor is detected by the first detection circuit, an output voltage is generated. The control unit determines the operating state of the totem pole power factor correction circuit according to the output voltage. If the totem pole power factor correction circuit is in the normal working state, and the totem pole power factor correction circuit is in a steady state or the output power (or the input voltage) is increased or decreased, the control unit controls the on/off states of the corresponding switches in the totem pole power factor correction circuit according to the output voltage.

Totem pole power factor correction circuit

Dual input power supply

Power supply with dual inputs

A power supply device is disclosed and includes a housing, a power board, an output terminal and a DCDC conversion module. The housing includes an accommodation space, and a first opening of a rear plate in communication with the accommodation space. The power board disposed in parallel to the lower plate is at least partially accommodated in the accommodation space, and a peripheral edge is disposed adjacent to the rear plate. The output terminal is disposed in parallel to the lower plate, and passes through the first opening of the rear plate. The DCDC conversion module is accommodated in the accommodation space and includes a primary circuit, a transformer and a secondary circuit. The transformer and the secondary circuit are arranged on the power board in sequence. The secondary circuit is arranged on part of the power board existing the peripheral edge and electrically connected to the output terminal.

Power supply device

A totem pole power factor correction circuit is provided. The detection module in the totem pole power factor correction circuit includes a detection resistor and a detection circuit. If the output voltage outputted by the detection circuit is greater than or equal to an upper limit voltage threshold or lower than or equal to a lower limit voltage threshold, at least a third switch and a fourth switch are turned off under control of the control unit. Consequently, the totem pole power factor correction circuit can be protected. Under this circumstance, the protecting measure can be taken immediately. Consequently, the possibility of causing damage of the totem pole power factor correction circuit will be minimized. In other words, the performance of the totem pole power factor correction circuit is enhanced.

The present application provides a power supply system for supplying power to network device, comprising power supply module, housing, and stereoscopic accommodating space therebetween. The power supply module without a fan comprises: a primary circuit comprising at least one primary switch and configured to receive AC input voltage and convert the AC input voltage into a first voltage; a transformer comprising primary and secondary windings and configured to convert the first voltage into a second voltage, the primary winding is coupled to the primary circuit; and a secondary circuit comprising at least one secondary switch and configured to convert the second voltage into a DC output voltage for the network device, the secondary circuit is coupled to the secondary winding, the secondary switch adopts SMT package, and power density of the power supply module is 60 W/inchor more. The stereoscopic accommodating space is filled with liquid coolant for cooling.

Power supply system for supplying power to network device

Growing community of inventors

Shanghai, China

Kai Dong