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.
APF
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2
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.
APF
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3
Hybrid 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.
APF
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4
Hybrid 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.
APF
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Hybrid 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.
APF
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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.
APF
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7
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.
APF
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8
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.
APF
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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.
APF
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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.
APF
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11
Active Adjusting Device Having Alternating-Current
Load Character
An active adjusting device parallel-connects
with a load, and then connects to a power source capable of generating an AC current.
The active adjusting device comprises an energy-storing capacitance, an energy
converter, a high-frequency filter, and a control circuit. The energy-storing
capacitance provides a stable direct-current volage, and then the controlcircuit
detects the direct-current voltage ofr excuting a closed-circuit control so as
to stabilize the direct-current voltage, and to generate a detection current.
The detection current is used as a feedback control for generating a drive signal
to drive the energy converter so that the energy converter converts the direct-current
voltage through the high-frequency filter to generate a first current. The first
current parallet-connects with a second current generated from the load so that
the AC ccurrent coming from power source. Thus, the load character in relation
to the power source is considered as a resister character.
APF
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Bidirctional Active Power Conditioner
A bidirctional active power conditioner comprises
a DC terminal, a bidirctional DC/DC power converter, a DC/AC inverter and an AC
terminal. The DC terminal electrically connects to a DC source. The bidirctional
DC/DC power converter can produce a predetermined DC voltage or DC current by
controlling the high frequency pulse width modulation. The DC/AC inverter can
be operated under lower frequency so as to convert the expected DC voltage signal
or DC current signal to a predetermined AC voltage signal or AC current signal.
The AC terminal is electrically connected to a load, and the AC terminal can further
connects to an AC source. Accoudingly, the bidirctional active power conditioner
has the advantages including small installation size, simple control circuit,
high efficiency and low installation cost.
APF
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13
Active Power Filter
An active power filter apparatus comprises a
power capacitor, a power inverter, a filtering circuit, and a controller. The
controller controls the power inverter to be operated as a virtual fundamental
frequency resistor to compensate for the losses of the apparatus, or a virtual
fundamental frequency capacitor to compensate a load for fundamental frequency
reactive power. The controller also controls the power inverter such that the
power inverter can provide a specific order harmonic current proportional to the
load for attenuating such a specific order of harmonic current of the load, and
for selecting an attenuating ratio of such a specific order of harmonic current.
The control method utilizes a current control mode to control the apparatus to
provide a compensating currentand utilizes source current, a source voltage, and
a energy storage capacitor voltage to evaluate a reference signal of the compensating
current. The controller receives the two detected currents, including the rao
source current and the source current which is filtered its fundamental frequency
components. Accordingly, the compensating current can be further accurate.
APF
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Active Power Conditioner
An active power conditioner comprises a first
serial-connected power switch circuit, a second serial-connected power switch
circuit, and a third serial-connected power switch circuit. When a source voltage
varies, one of the second and third serial-connected power switch circuits of
the active power conditioner is actuated under higher frequency, and the other
two serial-connected power switch circuits are actuated under lower frequency.
Accrodingly, the active power conditioner can fix a voltage across a load without
using a power capacitor.
APF
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Modularized Active Power Filter
A modularized active power filter comprises
a control module and at least one power module. The control module can automatically
detect the installation numbers of the power modules being installed and control
each of the power modules such that all the power modules can jointly provide
a total compensation demanded capacity. The total compensation demanded capacity
equals to a required demanded capacity of a load. Accordingly, the active power
filter has the advantages of flexible installation module numbers, short maintenance
time, mass production, and reducing cost.
APF
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Item
Subject
Summary
Product
Type
Application
Area
1
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.
UPS
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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.
UPS
TW
3
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.
UPS
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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.
UPS
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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.
UPS
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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.
UPS
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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.
UPS
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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.
UPS
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9
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.
UPS
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Method For Determining State-of-Health of Battery
A method for determining state-of-health o batteries
comprises the steps of: providing data of discharge voltages and currents of a
battery; setting a predetermined time interval and an acceptable value of current
variation therein; analyzing voltage and current variations within the predetermined
time interval; recording the data o discharge voltages, discharge current and
the voltage and current variations thereof; comparing the discharge voltages and
the voltage variations thereof within the acceptable value of the current variation;
and outputting the results as a health index of the battery.
UPS
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UPS System Having a Function of Parallet Operation
A UPS system having a function of parallel operation includes
one or a plurality of UPS units. The UPS unit includes a DC/AC inverter and a
control circuit. The control circuit is used to control the DC/AC inverter, and
includes a voltage feedback control circuit and a current feedforward control
circuit. The voltage feedback control circuit further includes a voltage-regulating
circuit and a waveform-controlling circuit for controlling the amplitude and the
waveform of load voltage respectively. The current feedforward control circuit
detects an output current of the DC/AC inverter to retrieve its fundamental component
and harmonic component which are operated as a virtual fundamental resistor and
the virtual harmonic resistor. The virtual fundamental resistor and the virtual
harmonic resistor are serially connected to an output terminal of the DC/AC inverter
. Outputs of the voltage feedback control circuit and the current feedforward
control circuit are added to form modulation signal which is sent to a PWM circuit
to obtain drive singals of the DC/AC inverter.
UPS
CN
Item
Subject
Summary
Product
Type
Application
Area
1
Maximum Power Point Tracking Method and Tracker Thereof
for a Solar Power System
A maximum power point tracking method and a tracker thereof
for a solar power system comprises the steps of: connecting a DC/DC converter
to a solar cell; a controller acting the DC/DC converter as a power converter
with an active resistance characteristic for supplying power to a DC/AC converter
or a DC load; the maximum power point tracking circuit adjusting the DC/DC converter
in a direction for changing the active resistance; abserving a change in output
power o the solar cell; continuously adjusting the DC/DC converter in the same
direction for continuously adjusting the DC/DC converter in the same direction
for continuously changing the active resistance if receiving a positive change
in the output power o the solar cell, atlernatively, adjusting the DC/DC converter
in a reversed direction if receiving a negative change in the output power of
the solar cell; the maximum power point tracking circuit repeatedly adjusting
the DC/DC converter in the same or reversed direction for searching a maximum
power point of the power output of the solar cell, and successively adjusting
positions of the DC/DC converter to locate around the maximum power point.
