Abstract: An iron core structure in a transformer which can show different leakage inductance values between primary and secondary windings includes an iron core, and the primary and secondary windings. A first core member of the iron core includes first and second side legs on either side of a first center leg, a second core member butted against the first includes third and fourth side legs on either side of a second center leg. The primary winding is arranged on the center leg, and the secondary winding is arranged on the side legs. The first and third side legs define a gap therebetween, there is a second gap defined between second and fourth side legs. Effective magnetic resistance of the side legs is increased, the primary and secondary windings show different leakage inductance values, and can meet diversified needs of power stage control circuits.

Abstract: A power control system with automatic balancing between dual inputs of power includes a first power supply, a second power supply, a power supply, a second power supply, a plurality of first power supply units and a plurality of second power supply units. The first power supply unit includes a first switch unit, and the second power supply unit includes a second switch unit. When the first power supply is powered off, the second power supply is switched through the first switch unit to power the first power supply unit. When the second power supply is powered off, the first power supply is switched through the second switch unit to power the second power supply unit. The power control system disclosed improves power usage and efficiency of the power supplies.

Abstract: A mobile advertisement device for playing back advertisements and advertisement types according to the current crown-sourcing structure information includes a driving module, an image capturing module, a processing module, and a display module. The driving module drives the mobile advertisement device to move. The image capturing module captures a plurality of images. The processing module processes the images to obtain crown-sourcing structure information. The display module plays back certain advertisements or advertisements at certain frequencies according to the crown-sourcing structure information. An advertisement playback system and method are also provided.

Abstract: A road traffic alarm and warning device, moveably mounted to an enclosure of a car and configured to notify a traffic obstacle and coupled to a main controller, includes a first communication unit configured to couple to the main controller and send out a control signal. An operation unit is configured to receive the control signal and output a driving signal according to the control signal and a driving unit is configured to receive the driving signal and move as required driving the alarm device to move out of the enclosure and into action. An alarm system with the alarm device is further disclosed.

Abstract: A rectification circuit includes a first input terminal, a first switch, an energy storage circuit, a first diode, a filtering circuit connected in series and in order to ground, a second diode, and a controller. Two opposite terminals of the second diode are connected to a first node between the first diode and the filtering circuit and a second node between the first switch and the energy storage circuit. The controller transmits control signals to the first switch and the second switch to control conductivities of the first switch and the second switch.

Abstract: A maximum power point tracking (MPPT) system and method applied to a photovoltaic (PV) device includes an MPPT device and a temperature control device within a load module. The MPPT system includes a control unit, a detection unit, and a determination unit and a first command to increase power to the temperature control device and the detection unit detects output power before the command and output power after the command. The determination unit determines whether the second output power is greater than the first output power. The control unit repeats the first command to the temperature control device when the second output power is greater than the first output power.

Abstract: A direct current (DC) to alternating current (AC) converter circuit without magnetic components includes a controller, a first DC power supply, a second DC power supply, a first electronic switch, a second electronic switch, a first output terminal, and a second output terminal. The controller controls the first electronic switch and the second electronic switch to turn on and off, to coordinate the outputs of positive and negative voltages from the first output terminal and the second output terminal to present and output an AC voltage. A cycle of the AC is equal to a cycle of a main power supply, and an average of an absolute value of a voltage of the AC is equal to an average of an absolute value of a voltage of the main power supply.

Abstract: A resonance frequency adjusting circuit in electronic communication with a power supply and a load connected to the power supply includes a first LC filter, a capacitor, a switch, and a frequency detecting and control module. The first LC filter circuit is electrically connected between the power supply and the load. The switch is electrically connected between the capacitor and ground. The frequency detecting and control module detects a current transient frequency of the load, compares the current transient frequency with a first resonance frequency of the first LC filter circuit, and controls the switch to turn on/off according to the comparison.

Abstract: A power system for supplying direct current (DC) voltage to a load requiring same includes a main power supply outputting a first alternating current (AC) power, an auxiliary power supply outputting a first DC power directly, and a bidirectional power factor correction device. When the bidirectional power factor correction determines that the first DC power is more than a rate power of the load, the auxiliary power supply outputs only a first part of the first DC power to the load, and outputs a second part to the bidirectional power factor correction. The bidirectional power factor correction converts the second part into a second DC power, and redirects the second DC power into the main power supply. The first part of the first DC power output allowed into the load equals to the rated power of the load.

Abstract: A rectifier circuit includes a three-phase alternating current (AC) voltage, a first rectifier unit, a second rectifier unit, a third rectifier unit, a first voltage output terminal, a second voltage output terminal, a first energy storing circuit and a second energy storing circuit. The three-phase AC voltage generates a first AC voltage, a second AC voltage, and a third AC voltage, and outputs them to the first rectifier circuit, a second rectifier circuit, and a third rectifier circuit correspondingly. The first energy storing circuit and the second storing circuit are connected in series and are coupled between the first voltage output terminal and the second voltage output terminal, to drive a load. In a positive period of each AC voltage, the second energy storing circuit is charged by each rectifier unit. In a negative period of each AC voltage, the first energy storing circuit is charged by each rectifier unit.

Abstract: A source supply circuit includes a main supply circuit for supplying a first directional current (DC) voltage, a solar supply circuit converting solar energy into electronic energy, an energy storing circuit for storing the energy generated both by the main supply circuit and the solar supply circuit, and a power regulator. The solar supply circuit further includes a current detector for detecting a current of the solar supply circuit, and a voltage detector for detecting a voltage of the solar supply circuit. The power regulator calculates an output power of the solar supply circuit according to the detected current and the detected voltage and adjusts the output power of the main supply circuit to make the solar supply circuit output a maximum power.

Abstract: In a method for dynamically regulating solar power using a computing device, the computing device connects to one or more switches, and each of the switches connects to a load device. A first power of solar energy sourced from a solar cell is calculated according to a first voltage and a first current of the solar energy, and a second power of the solar energy according to the second voltage and the second current of the solar energy sourced from the solar cell. At least one load device is switched from a power supply to the solar cell through a switch if the first power is greater than the second power, and at least one load device is switched from the solar cell to the power supply through the switch if the first power is not greater than the second power.

Abstract: A rectifier circuit includes a first alternating current (AC) voltage input terminal, a second AC voltage input terminal, a signal generating circuit, a first energy generating circuit, a second energy generating circuit, a third energy generating circuit, a first output terminal, and a second output terminal The first and second AC voltage input terminals receive an AC voltage. The signal generating circuit generates control signals. The first energy storing circuit is charged by the AC voltage. In a positive period of the AC voltage, the first energy storing circuit discharges to the second energy storing circuit.

Abstract: A rectifier circuit includes a three-phase AC power supply and a first rectifier unit. The three-phase AC power supply comprises a first AC voltage output terminal and a common terminal The three-phase AC power supply generates a first, a second, and a third AC voltage and outputs the AC voltages through output terminals and the common terminal The common terminal is grounded. The first rectifier unit converts each of the AC voltages into a first, second, and third DC voltage for independently powering separate loads. The first rectifier unit includes a grounded terminal connected to the common terminal to ground via a same conductive wire.

Abstract: A rectification circuit includes a first input terminal, a first switch, an energy storage circuit, a first diode, a filtering circuit connected in series and in order to ground, a second diode, and a controller. Two opposite terminals of the second diode are connected to a first node between the first diode and the filtering circuit and a second node between the first switch and the energy storage circuit. The controller transmits control signals to the first switch and the second switch to control conductivities of the first switch and the second switch.

Abstract: A power supply system includes a power supply unit, a number of electrical loads and a sequence circuit. The power supply unit provides power for the electrical loads through the sequence circuit. When any one of the electrical loads fails the sequence circuit will record the failure, shut down and lock the power supply unit to prevent the power supply unit from powering the electrical loads.

Abstract: A voltage conversion circuit includes a power source, at least one first capacitor, and a voltage convertor. The power source is for providing power for the voltage conversion circuit. The at least one first capacitors are electrically connected to the power source in parallel. The voltage convertor includes at least one group of first input pins, at least one group of second input pins, and at least one output pin that outputs converted voltage of the power to a load. The first and second group of input pins are respectively arranged on different edges of the voltage convertor, the power source and the at least one first capacitors are selectively electrically connected to one of the group of the first and second input pins and are arranged beside a corresponding edge of the voltage convertor.

Abstract: A resonance frequency adjusting circuit in electronic communication with a power supply and a load connected to the power supply includes a first LC filter, a capacitor, a switch, and a frequency detecting and control module. The first LC filter circuit is electrically connected between the power supply and the load. The switch is electrically connected between the capacitor and ground. The frequency detecting and control module detects a current transient frequency of the load, compares the current transient frequency with a first resonance frequency of the first LC filter circuit, and controls the switch to turn on/off according to the comparison.

Abstract: A power supply control system includes a power supply unit, a timing sequence controller, at least one converting circuit, and a power managing controller. The power supply unit provides a direct current input voltage. The timing sequence controller is powered by the power supply unit. The at least one converting circuit converts the input voltage into a direct current working voltage. The managing controller includes a detection unit detecting a voltage value of the output port, a comparison unit for comparing the voltage value of the output port with a value of the input voltage, and a control unit switching off the power supply unit when the voltage value of the output port is equal to value of the input voltage.

Abstract: A power protection circuit includes a fuse, a plurality of voltage converters, and controller. The fuse is electrically connected to a power source to transfer electric energy. The controller controls the fuse and the voltage converters, and the voltage converters are selectably electrically connected to or disconnected from the power source through the fuse. When the output voltage of a voltage converter exceeds a predetermined voltage of the voltage converter, the controller blows the fuse to the voltage converters. Hence, a computer cannot be restarted immediately before troubleshooting and replacement of the blown fuse, which can protect the voltage converters and the adjacent components in the computer due to direct reboot.