Abstract: A redundant power supply apparatus includes at least two power inlets, at least two power supply units, and a common component. Each power inlet is connected to an AC power source. Each power supply unit has an input side and the at least two power supply units having a common output side, each input side is connected to the power inlet, and each power supply unit is configured to convert the AC power source into a DC power source. The common component is connected at the common output side and configured to receive DC power sources. Accordingly, the redundant power supply apparatus is provided to improve reliability of redundant operations between multiple external power sources without using mechanical switches.

Abstract: An irregularity detection device for a power switch determines if a temperature-dependent resistance on a current path of the power switch is abnormal according to if a voltage on the current path is greater than or equal to a configuration value when the power switch is turned on, and generates an irregularity alarm associated with the power switch based on the determination result.

Abstract: A power supply has a power factor correction (PFC) circuit and a DC to DC conversion circuit. A DC to DC controller of the DC to DC conversion circuit acquires zero-crossing information and load information from the PFC circuit through a communication protocol, and performs a low-frequency compensation on a control command using a table-mapping means, thereby resolving the issues of higher controller complexity, changes of entire response characteristics and cost increase in conventional compensation technique.

Abstract: A universal power supply system allows each board mounted DC power module or each AC/DC power supply device therein having identical dimensions and appearance to further have a specification setting circuit. When the board mounted DC power module or the AC/DC power supply device is plugged in a backboard module, the specification setting terminal outputs a specification identification signal to a monitoring circuit of the backboard module. As built in with a specification mapping table, the monitoring circuit can compare the specification identification signal to find a model number corresponding to the signal, and automatically sets a critical current value or critical power value of each board mounted DC power module for over-current protection or over-power protection. Accordingly, the universal power supply system can be adapted to different board mounted DC power modules or AC/DC power supply devices without redesigning the backboard module.

Abstract: A redundant power system has a first power supply and a second power supply. The first power supply has a first controller with a first communication port and a first I/O port and has a normal mode, a master mode and a slave mode. An external device can send a mode setting command to the first controller through the first communication port. The first I/O port is set as an input port or an output port according to the mode executed by the first controller, wherein the output port is for indicating a power providing status of one power supply and the input port is for determining a power providing status of the other power supply. The power supplies can provide an appropriate power to a server according to the modes executed by the two controllers.

Abstract: The present invention relates to a power supply with output protection and a control method of the power supply. The invention mainly provides a pre-protection value lower than a default over-current protection value. When a present output current of the power supply is higher than or equal to the pre-protection value and is lower than the over-current protection value, the method firstly determines whether the power supply has abnormal conditions. When the power supply has abnormal conditions, the method can automatically provide or stop providing a working voltage to a load. When the present output current is further higher than or equal to the over-current protection value, the method takes an over-current protection action. By multi-level monitoring of the current values, the invention properly provides an over-current protection.

Abstract: An AC backup power system controls a power supply to selectively connect to a primary AC power source or a backup AC power source through a switching module. The switching module is controlled by a monitoring module. The monitoring module has a power monitoring unit, a first circuit switch, a second circuit switch, and a first processor. When the power monitoring unit detects an interruption of primary AC current, the first circuit switch that is normally closed is immediately turned off. The first processor then drives the switching module to connect to the backup AC power source. Once the backup AC power source reaches the zero-crossing point, the second circuit switch is turned on so that the backup AC power source provides power to the power supply. The power supply receives power at the zero-crossing point to avoid problems of sparks and coke deposition.

Abstract: A redundant power system has a first power supply and a second power supply. The first power supply has a first controller with a first communication port and a first I/O port and has a normal mode, a master mode and a slave mode. An external device can send a mode setting command to the first controller through the first communication port. The first I/O port is set as an input port or an output port according to the mode executed by the first controller, wherein the output port is for indicating a power providing status of one power supply and the input port is for determining a power providing status of the other power supply. The power supplies can provide an appropriate power to a server according to the modes executed by the two controllers.

Abstract: A switching power supply with a resonant converter has an AC to DC converter and a DC to DC converter. The AC to DC converter converts an inputted AC power into a DC power. The DC to DC converter has a resonant converter determining a current operating state according to waveforms of a transformer voltage and a driving signal actually measured and further controlling a switching frequency of the resonant converter to approach or to be equal to a resonant frequency for operational efficiency enhancement. Accordingly, the failure to accurately calculate a resonant frequency beforehand can be solved and the issue of accurately keeping the switching frequency consistent with the resonant frequency can be tackled.

Abstract: A multi-mode current-allocating device serves to control the DC to DC converter in each power supply device of a distributive power supply system. The multi-mode current-allocating device has an active current-sharing control circuit, a current-allocating bypass circuit, and a droop current sharing control circuit to be selectively operated under an active current-sharing mode, a current-allocating mode or a droop current-sharing mode according to the factors of the type of input power of each power supply device, the state of system load, and the system reliability so as to maintain the power supply efficiency of entire power supply system and reduce unnecessary power loss.

Abstract: A power supply system has a housing and a front panel. The housing has multiple power supply slots disposed on a rear of the housing for mounting multiple power supplies respectively. The front panel has multiple peak portions and multiple valley portions arranged alternately to form a multi-dimensional space. Each peak portion has a first inclined wall for mounting multiple terminal holders, and has a second inclined wall for forming a heat dissipating structure. Electric power is input into the server power supply system via the terminal holder and is transformed and transmitted to the power supplies. With the terminal holders and the heat dissipating structures disposed on the peak portions of the front panel, space of the front of the housing can be utilize efficiently and heat dissipating efficiency to the server power supply system is also improved.

Abstract: A transformer has two magnetic cores, at least one primary winding unit mounted in the magnetic cores, at least one secondary winding unit mounted in the magnetic cores and two rectifying circuit boards externally mounted beside the magnetic cores. An AC voltage output from the secondary winding unit is transmitted to and rectified by the rectifying circuit board. Therefore, the size of the transformer is compact, and heat energy generated by electronic elements mounted on the rectifying circuit board is effectively dissipated to maintain normal operation of the transformer. Further, since the transmission path from the secondary winding unit to the rectifying circuit board is short, energy loss is reasonably reduced when the transformer is operated under a high frequency situation or a larger current mode.

Abstract: A full bridge phase shifted power supply with synchronous rectification and current doubler and method for dynamically adjusting delay parameters thereof mainly have multiple delay parameter combinations respectively varying with multiple loads and embedded in a controller of the power supply. The delay parameter combinations serve to determine driving waveforms of two rectification switches of a synchronous rectification and current doubler circuit of the power supply. When the load of the power supply varies, the controller dynamically performs a corresponding delay parameter combination so as to vary the driving waveforms of the rectification switches of the synchronous rectification and current doubler circuit and enhance the operating efficiency of the power supply.

Abstract: An AC backup power system controls a power supply to selectively connect to a primary AC power source or a backup AC power source through a switching module. The switching module is controlled by a monitoring module. The monitoring module has a power monitoring unit, a first circuit switch, a second circuit switch, and a first processor. When the power monitoring unit detects an interruption of primary AC current, the first circuit switch that is normally closed is immediately turned off. The first processor then drives the switching module to connect to the backup AC power source. Once the backup AC power source reaches the zero-crossing point, the second circuit switch is turned on so that the backup AC power source provides power to the power supply. The power supply receives power at the zero-crossing point to avoid problems of sparks and coke deposition.

Abstract: A universal power supply system allows each board mounted DC power module or each AC/DC power supply device therein having identical dimensions and appearance to further have a specification setting circuit. When the board mounted DC power module or the AC/DC power supply device is plugged in a backboard module, the specification setting terminal outputs a specification identification signal to a monitoring circuit of the backboard module. As built in with a specification mapping table, the monitoring circuit can compare the specification identification signal to find a model number corresponding to the signal, and automatically sets a critical current value or critical power value of each board mounted DC power module for over-current protection or over-power protection. Accordingly, the universal power supply system can be adapted to different board mounted DC power modules or AC/DC power supply devices without redesigning the backboard module.

Abstract: A power factor control circuit has a power factor controller that determines if the power factor control circuit is operated at a continuous current mode (CCM) or a discrete current mode (DCM), and outputs PWM signals corresponding to the present current mode. A duty cycle of the PWM signals is equal to a sum of a feed-forward control parameter and a current compensation parameter. The current compensation parameter contains a difference value between a reference current and an inductor current in the power factor control circuit. Accordingly, a switching power supply circuit can acquire the PWM signals corresponding to the present current mode to effectively resolve the issue of harmonic distortion.

Abstract: The present invention discloses a compact server power supply having high power density has a casing, a main printed circuit board, a sub-printed circuit board, a power supplying circuit, a power output terminal set and a fan. The power supplying circuit has a primary side circuit unit, a transformer and a secondary side circuit unit. Electric elements of the primary and secondary side circuit units and the transformer are soldered on the main printed circuit board except parts of the electric elements of the secondary side circuit unit are soldered on the sub-printed circuit board. The sub-printed circuit board is vertically mounted and soldered on the main printed circuit board, so the length of the main printed circuit board is shortened to implement the server power supply having a compact size and high power density.

Abstract: The present invention relates to a power supply with output protection and a control method of the power supply. The invention mainly provides a pre-protection value lower than a default over-current protection value. When a present output current of the power supply is higher than or equal to the pre-protection value and is lower than the over-current protection value, the method firstly determines whether the power supply has abnormal conditions. When the power supply has abnormal conditions, the method can automatically provide or stop providing a working voltage to a load. When the present output current is further higher than or equal to the over-current protection value, the method takes an over-current protection action. By multi-level monitoring of the current values, the invention properly provides an over-current protection.

Abstract: A cable clip has a body and a fastener. The body has two supporting arms and a connecting arm. Each supporting arm has two ends. The connecting arm is formed between corresponding ends of the supporting arms. The fastener is mounted pivotally on the connecting arm of the body and has a through hole and multiple side surfaces. Distances from the through hole to the side surfaces of the fastener are different. Then, rotating the fastener adjusts the side surfaces abutting a plug to different plugs in different sizes.