Abstract: A light source device includes a light guide plate, an optical adhesive, and a light source element. The light guide plate includes a light guide substrate and an enhancement layer. The light guide substrate has a light incident surface, a first surface, and a second surface. The first surface is opposite to the second surface, and the light incident surface extends between the first surface and the second surface. The enhancement layer is disposed on the light guide substrate. A thickness of the enhancement layer is from 1 micrometer to 25 micrometers and a first refractive index of the light guide substrate is greater than a second refractive index of the enhancement layer. The optical adhesive is interposed between the first surface of the light guide substrate and the optical adhesive. The light source element is disposed beside the light incident surface to emit light toward the light incident surface.

Abstract: A dual power switching system includes a first STS, a second STS, an inductive device, and a controller. The first STS is electrically coupled to a main power source, and the second STS is electrically coupled to a backup power source. When detecting that the main power source is abnormal, the controller detects a residual magnetic flux of the inductive device and calculates a magnetic flux difference between the predicted magnetic flux and the residual magnetic flux. When determining that an absolute value of the magnetic flux difference is less than or equal to a magnetic flux deviation value, the controller determines whether the output power meets a forced commutation condition. When determining that the output power meets the forced commutation condition, the controller turns on the second STS so that the first STS is forcibly turned off by the backup power source through the second STS.

Abstract: A ground fault detection apparatus is used to detect a ground fault of a three-phase UPS apparatus. The UPS apparatus includes a first filter circuit, an AC/DC conversion circuit, a DC bus, a DC/AC conversion circuit, and a second filter circuit coupled in sequence. The ground fault detection apparatus includes a detection circuit having a first detection end and a second detection end. The first detection end is coupled to the first filter circuit and the second filter circuit, and the second detection end is coupled to an equipment grounding point. The equipment grounding point is coupled to a neutral point of a three-phase power source, and the three-phase power source is coupled to the first filter circuit. The detection circuit indicates whether the UPS apparatus has a ground fault and a location where the ground fault occurs according to a detection voltage between the first detection end and the second detection end.

Abstract: A ground fault detection apparatus is used to detect a ground fault of a three-phase UPS apparatus. The UPS apparatus includes a first filter circuit, an AC/DC conversion circuit, a DC bus, a DC/AC conversion circuit, and a second filter circuit coupled in sequence. The ground fault detection apparatus includes a detection circuit having a first detection end and a second detection end. The first detection end is coupled to the first filter circuit and the second filter circuit, and the second detection end is coupled to an equipment grounding point. The equipment grounding point is coupled to a neutral point of a three-phase power source, and the three-phase power source is coupled to the first filter circuit. The detection circuit indicates whether the UPS apparatus has a ground fault and a location where the ground fault occurs according to a detection voltage between the first detection end and the second detection end.

Abstract: A detection circuit is electrically connected with a static transfer switch. The static transfer switch includes a silicon controlled rectifier. The detection circuit includes a high-pass filter, a low-pass filter, an absolute value circuit and a determination unit. After the high-pass filter filters off a low-frequency component of a terminal voltage between the first terminal and the second terminal of the static transfer switch, a first signal is generated. After a high-frequency component of the first signal is filtered off by the low-pass filter, a second signal is generated. The second signal is converted into an absolute value signal by the absolute value circuit. If no pulse signals are contained in the absolute value signal, the determination unit determines that the static transfer switch is in an abnormal on condition.

Abstract: A detection circuit is electrically connected with a static transfer switch. The static transfer switch includes a silicon controlled rectifier. The detection circuit includes a high-pass filter, a low-pass filter, an absolute value circuit and a determination unit. After the high-pass filter filters off a low-frequency component of a terminal voltage between the first terminal and the second terminal of the static transfer switch, a first signal is generated. After a high-frequency component of the first signal is filtered off by the low-pass filter, a second signal is generated. The second signal is converted into an absolute value signal by the absolute value circuit. If no pulse signals are contained in the absolute value signal, the determination unit determines that the static transfer switch is in an abnormal on condition.

Abstract: A protecting structure of an uninterruptible power supply prevents the uninterruptible power supply. The uninterruptible power supply device has a switch with a switching piece. The protecting structure includes a chassis, a sensor and a cover body. The chassis has an opening slot, the uninterruptible power supply device is installed in the chassis, and the switching piece is disposed corresponding to the opening slot. The sensor is provided on a side of the opening slot of the chassis and electrically connected with the uninterruptible power supply device. The cover body includes a cover plate and at least one blocking member connecting with the cover plate. The cover plate covers the opening slot, wherein the switching piece ejects the blocking member to expose the opening slot when the covered switching piece is switched from a first position to a second position.

Abstract: An uninterruptible power supply and method for controlling same are disclosed. The controlling method includes the steps of bypassing the first AC power to the output terminal via the bypass loop and the switch and converting a second AC power having a voltage, phase and frequency substantially equal to that of the first AC power by an inverter when the first AC power is normal; and switching the second AC power to the output terminal via the switch when the phase or frequency of the first AC power is changed so as to generate a difference value between the first AC power and the second AC power and the difference value is larger than a predetermined difference value.

Abstract: A controlling method of uninterruptible power supply system comprising a first UPS and a second UPS for continuously providing power to a load is disclosed. The controlling method includes the steps of (a) determining if the first UPS is normal; (b) providing power to the load via the first UPS when the first UPS is normal and determining if the second UPS is normal when the first UPS is abnormal; and (c) providing power to the load through the second UPS when the second UPS is normal and providing the power to the load through a bypass route when the first UPS and the second UPS are both abnormal.

Abstract: Disclosed is an uninterruptible power supply including a switch connected between an external power source and a load, a power supply module connected to the external power source and the switch for receiving and converting an input power and supplying converted power to the load, a battery module connected to the power supply module for storing electric power or supplying electric power to the power supply module, a control module connected to the external power source and the battery module and powered by the external power source or the battery module for generating a control signal according to a specific operating status of the power supply module to manipulate the switch so as to supply power to the load through the power supply module or a bypass route, and a display panel connected to and powered through the control module for receiving and displaying system status information from the control module.

Abstract: An uninterruptible power supply and method for controlling same are disclosed. The controlling method includes the steps of bypassing the first AC power to the output terminal via the bypass loop and the switch and converting a second AC power having a voltage, phase and frequency substantially equal to that of the first AC power by an inverter when the first AC power is normal; and switching the second AC power to the output terminal via the switch when the phase or frequency of the first AC power is changed so as to generate a difference value between the first AC power and the second AC power and the difference value is larger than a predetermined difference value.

Abstract: A control method for a voltage boosting circuit adapted to be used in an uninterruptible power supply is proposed. The uninterruptible power supply includes a battery module and a voltage boosting circuit comprising a plurality of switch elements, in which the uninterruptible power supply is operating under a battery supply mode. The control method includes the following steps: detecting an output voltage of the battery module and a regulated predetermined output voltage of the voltage boosting circuit; and when the output voltage of the battery module is higher than the regulated predetermined output voltage of the voltage boosting circuit, sending a switching signal to regulate the switching operation of the switch elements of the voltage boosting circuit, so that the output voltage of the voltage boosting circuit is substantially equal to the output voltage of the battery module.

Abstract: Disclosed is an uninterruptible power supply including a switch connected between an external power source and a load, a power supply module connected to the external power source and the switch for receiving and converting an input power and supplying converted power to the load, a battery module connected to the power supply module for storing electric power or supplying electric power to the power supply module, a control module connected to the external power source and the battery module and powered by the external power source or the battery module for generating a control signal according to a specific operating status of the power supply module to manipulate the switch so as to supply power to the load through the power supply module or a bypass route, and a display panel connected to and powered through the control module for receiving and displaying system status information from the control module.

Abstract: Provided is a parallel uninterruptible power supply system including a first uninterruptible power supply and a second uninterruptible power supply connected in parallel with each other, and a connector interconnecting a first signal transmission line of the first uninterruptible power supply and a second signal transmission line of the second uninterruptible power supply. A first control module of the first uninterruptible power supply can directly receive data signal outputted from a second power supply module and a second battery module of the second uninterruptible power supply, and a second control module of the second uninterruptible power supply can directly receive data signal outputted from a first power supply module and a first battery module of first uninterruptible power supply, so that the first uninterruptible power supply and the second uninterruptible power supply can communicate directly with each other.

Abstract: An emergent power supply system capable of automatically balancing the input currents of a multiplicity of backup power supply modules therein is addressed.

Abstract: A control method for a voltage boosting circuit adapted to be used in an uninterruptible power supply is proposed. The uninterruptible power supply includes a battery module and a voltage boosting circuit comprising a plurality of switch elements, in which the uninterruptible power supply is operating under a battery supply mode. The control method includes the following steps: detecting an output voltage of the battery module and a regulated predetermined output voltage of the voltage boosting circuit; and when the output voltage of the battery module is higher than the regulated predetermined output voltage of the voltage boosting circuit, sending a switching signal to regulate the switching operation of the switch elements of the voltage boosting circuit, so that the output voltage of the voltage boosting circuit is substantially equal to the output voltage of the battery module.

Abstract: A battery ground fault detecting circuit applied to an uninterruptible power system is disclosed. The uninterruptible power system has a controller and is connected to a battery box having a ground terminal. The battery ground fault detecting circuit is employed for detecting whether a ground fault is occurred in a battery mounted in the battery box, so that the controller can execute a corresponding protection procedure.

Abstract: An emergent power supply system capable of automatically balancing the input currents of a multiplicity of backup power supply modules therein is addressed.

Abstract: A battery ground fault detecting circuit applied to an uninterruptible power system is disclosed. The uninterruptible power system has a controller and is connected to a battery box having a ground terminal. The battery ground fault detecting circuit is employed for detecting whether a ground fault is occurred in a battery mounted in the battery box, so that the controller can execute a corresponding protection procedure.