Resonant Protection Kit for Power Supply

The kit using novel method can avoid the harmonic resonance phenomenon, especially for power factor correcting capacitor. This is a more economic way to protect power capacitor. The kit built-in microprocessor with FFT algorithm can calculate effectively over-current amplitude, which shall be converted by the voltage crossing the terminal of power capacitor, and no CT shall be required. The easy-to-install design of this technique, regardless with the current/voltage rating, is flexible and suitable to all of protecting power capacitor application.

Backup Display for UPS

A novel calculating method is built inside the microprocessor to display remaining backup time on the front panel of UPS. The remaining backup time display on the front panel shall be refreshed at real time according to UPS load condition. Especially, the patented technique also developed the self-learning mode; hence the microprocessor can automatically correct the real capacity of various batteries.

Interconnecting Device for a Battery

The interconnecting device provides convenient and safe connection between battery post and remote monitoring (or measuring) equipment. The terminals mounted on the interconnecting device are easy and quick to plug-in and draw-out the cables connected the remote monitoring equipment, without the dangerous and complicated operation of releasing/fastening the battery post screw. A fuse is mounted inside the interconnecting device to avoid the damage caused by the short circuit in the lines from battery terminal to remote monitoring equipment.

Control Module for a Fan Filter Unit

High-Tech manufacturers such as semiconductor factories and wafer plants have installed a great quality of fan filters in clean rooms. In order to control fans on/off and detect the operational status of fans, the fan filter control units shall be adapted. The fan control module employing this patented technique provides an special design warning signal, which displays abnormal fan motor status and shall be kept inside memory circuit until people reset it manually.

Active Harmonic Suppression Equipment and Control Method Therefor

The active harmonic suppression equipment provides the expected compensating current, which is injected into the power feeder to cancel the harmonics current generated by the nonlinear load. Then, the current of utility is nearly sinusoidal. The patented active harmonic suppression technique is capable of smaller ripple current, lower power loss, and lighter weight than that of conventional active electric power filters.

Hybird Switch Module for an AC Power Capacitor

This invention is a hybrid switch module for power capacitor. It includes a control circuit, a thyristor switch and an electromagnetic switch. Because the capacitor is energized when the capacitor voltage is zero, there is no inrush current. Employing inventive control process method, the arcing phenomenon shall not happen at the electromagnetic switch inside the hybrid switch module. Here are advantages of un-disturbing power system and prolonging the life electromagnetic switch, adapting this inventive technique to control power capacitor on/off.

DC/DC Boost Converter and Control Method Therefor

A dc/dc step-up regulator with the unique structure, which performs high efficiency and wide input voltage range, can provide a stable dc voltage at its output terminal. The electronic switch of the regulator using PWM technology will automatically start to operate, when the input voltage drops lower than the default level. It is suitable to be applied on ride-through backup power systems such like UPS and DC Bank for ASD. In order to keep the continuously running of power supply system or motor when the input voltage downs, the regulator delivers the stable dc power to the input terminals of inverter inside UPS or ASD. The input source of the regulator may be rectifier or battery.

Multi-battery Monitoring Kit

A multi-battery monitoring kit mainly includes a data-collecting/analyzing unit, a plurality of data-accessing modules and a plurality of sensing modules. The data-collecting/analyzing unit adapted master-free technique can play either mater or slave unit, according to system figuration requirement. The high speed scanning design is perfected especially for the battery monitoring application of extreme high-rate current discharge within the short time. It shall perform perfectly and never lose the important data even on some ride-through backup power systems such like UPS and DC Bank for ASD.

Control Method for Parallel-connected Power Converters

The invention is related to a power converter control method and more particularly applied in a parallel-connected operation, thereby automatically balancing the load current distribution among power converters and reducing the total harmonic distortion of output voltage under the nonlinear load. This method does not use the communication of distribution current signals among the parallel-connected power converters and does not require extra hardware component, so it will substantially increase the reliability of inverter operation in parallel mode.

Hybird Reactive Power Compensation Device-I

The invention is related to a hybrid reactive power compensation device including a passive type reactive power compensator and an active type reactive power compensator serially connected thereto, which are adapted to supply a linearly adjustable reactive power within a predetermined range in the distribution power system. Moreover, the active type reactive power compensator provids with a serial-connected virtual harmonic damping, and thereby it can avoid the power resonance generated between the passive type reactive power compensator and the reactance of power system that may cause destruction of the reactive power compensation device itself and adjacent power facilities.

Hybird Reactive Power Compensation Device-II

The invention is related to a hybrid reactive power compensation device including a passive type reactive power compensator and an active type reactive power compensator serially connected thereto, which are adapted to supply a linearly adjustable reactive power within a predetermined range in the distribution power system. Moreover, the active type reactive power compensator adjusts a current flowing through the passive type reactive power compensator to be approximated as a sinusoidal waveform, and thereby it can avoid the power resonance generated between the passive type reactive power compensator and the reactance of power system that may cause destruction of the reactive power compensation device itself and adjacent power facilities.

Hybird Reactive Power Compensation Device-III

The invention is related to a hybrid reactive power compensation device including a passive type reactive power compensator and an active type reactive power compensator serially connected thereto, which are adapted to supply a linearly adjustable reactive power within a predetermined range in the distribution power system. The active type reactive power compensator adjusts a current flowing through the passive type reactive power compensator to be approximated as a sinusoidal waveform, and thereby it can avoid the power resonance generated between itself and the reactance of power system that may destroy the reactive power compensation device and adjacent power facilities.

Bi-Directional DC/DC Power Converter Having a Neutral Terminal

The invention is related to a bi-directional dc/dc power converter having a neutral terminal. The power converter can be operated as either a step-up converter or step-down converter. The two dc voltages with the same amplitude are serially connected to the neutral terminal to provide a double voltage at the output voltage terminal set. The power converter adapted between the dc source (such as battery) and the DC side of half-bridge inverter can overcome cost-effectively the single output terminal set problem of convenient boost converter.

Backup Power Supply System with a Null Transfer Time

The invention is related to a backup power supply system with a null transfer time. More particularly, the inventive technique is applied to a dc/ac power inverter for avoiding a short period of power interruption during the duration of the power transfer caused by the mechanical switch operation in the output terminal of the dc/ac power inverter. When power utility is normal, the inverter shall operate parallel link with power utility and keep zero current output as hot-standby mode. Once power utility down, the static switch shall block the connection between power utility and load, then inverter supplies power to load without any interruption. That shall be the best one of economic operation modes for backup power system such as UPS.

Switching Device for RS-232 Serial Port and USB Serial Port

The invention relates to an automatically switching device for RS-232 serial port and USB serial port. More particularly, the inventive technique achieved the special communication feature via both a RS-232 serial port and an USB serial port. A computer and peripherals thereof are able to communicate with the RS-232 serial port or the USB serial port. The simple and cheap microprocessor are mounted inside most of micro-UPS, the processor cannot offer two communication ports. This invention provided an economic solution way.

Power Converter of a Hybrid Power Filter

The technique is related to the power converter of hybrid power filter. This power converter is a bridge configuration, and it consists of a set of the power electronic devices and a dc capacitor. The salient point of this invention is that one line of the power feeder can connect to one of two dc capacitor voltage terminal without passing through connection point of the power electronic switch set. Hence, the number of the power electronic devices used in this invention is less than that used in the conventional power converter. Of course, this technique did a novel power converter of hybrid power filter, and resulted in cheaper cost about the converter.

Reactive Power Compensating Device

A reactive power compensating device applies a small capacitance of a power converter to an ac capacitor to avoid resonance caused by the ac capacitor or linearly adjust the reactive power compensation within a specific range. It is characterized in that the power converter adopts a small amount of power switches (bridge structure omitting one terminal), wherein one power compensating line un-controlled by power switch is directly connected to either of a positive or negative terminal disposed on a dc side of the power converter. Consequently, the reactive power compensating device has an advantage of employing a small amount of the power switches.

Three-Phase Three-Wire Active Power Filter

This three-phase three-wire active power filter consists of only two inverter bridge arms. The power converter has two dc terminals and two ac terminals. Each arm configures by two series connected power electronic devices. Arbitrary one phase un-controlled by power electronic device is directly connected to the arbitrary one of two dc terminals Hence, the number of power electronic devices used in the power converter can be reduced, and the hardware cost can be down.

Active Equipment for Harmonic Suppression

The active harmonic suppression equipment provides the expected compensating current, which is injected into the power feeder to cancel the harmonics current generated by the nonlinear load. Moreover, this equipment can be controlled to supply a fixed or variable reactive power.

Harmonic Suppressible AC/DC converter

A harmonic suppressible AC/DC converter is only adapted to detect an input current and an output DC voltage, which is proportional to the input current, to an input side of the AC/DC converter. The input side of the AC/DC converter acts as a virtual resistor with a linear resistance characteristic, thereby obtaining an input current with high power factors and low harmonic distortion. The AC/DC converter converts energy from a power source to a stabilized DC voltage to supply to a DC load.The input current with high power factors and low harmonic distortion can therefore be provided without detecting and AC volage of a power source. As voltage frequencies of the power source are changed, acting the AC/DC converter as the virtual resistor can synchronously change frequencies of the input current. Under these conditions of changes in voltage frequencies of the power source, the AC/DC converter can be normally operated to obtain the input current with high power factors and low harmonic distortion.