专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

111. 发明专利

GB9419248D0 Switched mode power supply circuit 未知
公开(公告)号：GB9419248D0
公开(公告)日：1994-11-09
申请号：GB9419248
申请日：1994-09-23
申请人： CEGELEC IND CONTROLS LTD
IPC分类号： H02J3/48 , H02M7/48 , H02M7/493
摘要： A power supply circuit operating in switched-mode comprises a plurality of switching devices 12 connected to a common output 26 each to provide an output current to a common load. An arrangement 22, 21 is provided to ensure that the output current provided by each of the switching devices is shared such that at the maximum rating of the power supply each switching device contributes current substantially equivalent to its maximum current rating so that no switching device is overloaded. Many applications of the power supply are described, such as speed control of a motor. Control is by means of PWM 16a and current sensor 24 may be a Hall effect device.

112. 发明专利

CA1308435C PEAK POWER SHAVING APPARATUS AND METHOD 未知
公开(公告)号：CA1308435C
公开(公告)日：1992-10-06
申请号：CA553438
申请日：1987-12-03
申请人： CATERPILLAR INC
发明人： ALENDUFF PHILLIP D , CRUMP RICHARD A , PORTER GREGORY J
IPC分类号： H02J9/08 , H02J3/38 , H02J3/46 , H02J3/48 , H02P9/00 , F02D29/06 , H02J3/40
摘要： Electrical Utility Peak Shaving Apparatus and Method Utility charges associated with peak electrical power demands constitute an increasing portion of utility bills associated with large commercial consumers of electricity. The instant invention provides an apparatus for reducing the peak electrical demand of a predetermined user operational unit from an electrical power distribution network by controllably operating at least one secondary electrical generator associated with the operational unit in parallel with the utility power distribution network. The secondary electrical generator includes a switch for connecting the generator in parallel with the utility network in response to receiving a transfer command signal. A transducer senses the actual peak power demand of the operational unit from the utility network and produces a demand signal having a value responsive to the sensed actual peak power demand. A memory element controllably stores a plurality of control parameters including a demand setpoint value. A logic device controllably produces the transfer command signal and connects the secondary electrical generator in parallel with the utility distribution network in response to the value of the demand signal exceeding the value of the demand setpoint. The logic device controls the secondary electrical generator to produce only the amount of power necessary to maintain the demand signal at or below the demand setpoint value.

113. 发明专利

SU1637671A3 DEVICE FOR AUTOMATIC CONTROL OF CAPACITOR BANK REACTIVE POWER 未知
公开(公告)号：SU1637671A3
公开(公告)日：1991-03-23
申请号：SU4499220
申请日：1988-10-06
申请人： KOROTEEV BORIS E
发明人： KOROTEEV BORIS E
IPC分类号： G05F1/70 , H02J3/48

114. 发明专利

AU7288887A PEAK POWER SHAVING APPARATUS AND METHOD 未知
公开(公告)号：AU7288887A
公开(公告)日：1988-06-30
申请号：AU7288887
申请日：1987-03-23
申请人： CATERPILLAR INC
发明人： ALENDUFF PHILLIP D , CRUMP RICHARD A , PORTER GREGORY J
IPC分类号： H02J9/08 , H02J3/38 , H02J3/46 , H02J3/48 , H02P9/00 , H02J3/40 , F02D29/06 , F02N11/06 , G06F15/46
摘要： The apparatus reduces the peak electrical demand of a predetermined user operational unit (18) from an electrical power distribution network (14) by controllably operating at least one secondary electrical generator (24) associated with the operational unit (18) in parallel with the utility network (14). A transducer (20) senses the actual peak power demand of the operational unit (18) from the utility network (14) and produces a demand signal having a value responsive to the sensed actual peak power demand. A memory element (40) controllably stores a plurality of control parameters including a demand setpoint value. A logic device (36) controllably produces the transfer command signal and connects the generator (24) in parallel with the utility network (14) in response to the value of the demand signal exceeding the value of the demand setpoint. The logic device (36) controls the generator (24) to produce only the amount of power necessary to maintain the demand signal at or below the demand setpoint value.

115. 发明专利

IT1100986B 未知
公开(公告)号：IT1100986B
公开(公告)日：1985-09-28
申请号：IT2908378
申请日：1978-10-25
申请人： WESTINGHOUSE ELECTRIC CORP
IPC分类号： H02J3/00 , F02C9/00 , F02C9/42 , H02J3/48 , H02P9/04 , F01D
摘要： A control system for multiple gas turbine-generator units 12 comprises a local control computer 14 which computes a maximum permissible output for each gas turbine-generator unit independently as a dynamic function of combustor shell pressure and exhaust temperature in that unit and the output thus obtained is transmitted to a central control 16. Load demands calculated for each unit are dispatched from the central control to individual local control arrangements 18 which respond to control their respective gas turbine- generators in a manner not to exceed the respective maximum output. Each turbine control 14 sets its generator output at a preset level which is modified by load change signals from the central control 16 and each control 14 operates its turbine fuel control to satisfy the load demand.

116. 发明专利

GB2012080B CONTROL SYSTEM FOR POWER SOURCES 未知
公开(公告)号：GB2012080B
公开(公告)日：1982-11-24
申请号：GB7847679
申请日：1978-12-08
申请人： SUNDSTRAND CORP
IPC分类号： H02J3/46 , G05B11/32 , H02J1/10 , H02J3/48 , G05B11/00 , G05B11/06 , G05B11/60 , H02J1/14 , H02J3/06
摘要： Control systems for controlling load division among plural power sources coupled in parallel and providing power to a common load using feedback techniques. Control systems for various types of plural power sources are disclosed, including DC generators, hydraulic variable displacement pumps and AC generators driven by a constant speed drive. The outputs of the individual power sources are responsive and proportional to individual input control signals. The magnitude of a power component common to all the power sources or frequency, if the power sources are AC generators driven by constant speed drives, is compared to a reference to provide an error signal. Individual sensors sense the magnitude of a variable power component from each power source and provide a signal proportional thereto. Individual signals representing the variable power component are combined with the error signal to provide the individual control signals for each power source.

117. 发明专利

BR8003131A 未知
公开(公告)号：BR8003131A
公开(公告)日：1980-12-23
申请号：BR8003131
申请日：1980-05-16
申请人： COHN N
发明人： COHN N
IPC分类号： H02J3/06 , H02J3/48
摘要： This invention introduces the concept that on an interconnected electric power system, the area-caused components of memory parameters system time deviation and the total inadvertent interchange of each constitutent control area are separable and measurable. Methods and means are disclosed for separating each of the components and determining its magnitude, utilizing known or measurable parameters, thereby providing new long-desired area memory parameters which are precise measures of the control performance of each area. The portion of system time deviation and the portion, designated primary inadvertent, of total area inadvertent interchange caused by an area's own regulating deficiencies, and the portion, designated secondary inadvertent, of total area inadvertent interchange caused by regulating deficiencies of each remote area, are identified. Certain of the components are then utilized in their respective areas to provide unilateral simultaneous corrective control of said area's component of system time deviation, said area's primary component of area inadvertent interchange, and the secondary inadvertent components of area in advertent interchange of all remote areas caused by the regulating deficiencies of said area, doing so more effectively, more equitably and more economically than is possible with prevailing conventional control techniques.

118. 发明专利

FR2414226A1 未知
公开(公告)号：FR2414226A1
公开(公告)日：1979-08-03
申请号：FR7900363
申请日：1979-01-08
申请人： SUNDSTRAND CORP
IPC分类号： H02J3/46 , G05B11/32 , H02J1/10 , H02J3/48 , G05F5/00 , F04B49/06 , H02P9/04
摘要： Control systems for controlling load division among plural power sources coupled in parallel and providing power to a common load using feedback techniques. Control systems for various types of plural power sources are disclosed, including DC generators, hydraulic variable displacement pumps and AC generators driven by a constant speed drive. The outputs of the individual power sources are responsive and proportional to individual input control signals. The magnitude of a power component common to all the power sources or frequency, if the power sources are AC generators driven by constant speed drives, is compared to a reference to provide an error signal. Individual sensors sense the magnitude of a variable power component from each power source and provide a signal proportional thereto. Individual signals representing the variable power component are combined with the error signal to provide the individual control signals for each power source.

119. 发明专利

AU2296677A LOAD BALANCING SYSTEM FOR UPS RECTIFIERS 未知
公开(公告)号：AU2296677A
公开(公告)日：1978-09-14
申请号：AU2296677
申请日：1977-03-07
申请人： WESTINGHOUSE ELECTRIC CORP
发明人： HULL ROBERT EDWARD , GEMP ROBERT STENSON
IPC分类号： G05F1/56 , H02J3/48 , H02J9/06 , H02M5/45 , H02M7/162 , H02J3/46 , H02J9/00 , H02P13/24 , H02M7/17

120. 发明专利

FR1596901A 未知
公开(公告)号：FR1596901A
公开(公告)日：1970-06-22
申请号：FR1596901D
申请日：1968-12-16
IPC分类号： H02J3/46 , H02J3/48
摘要： 1,176,750. Running alternators in parallel; synchronizing. SIEMENS A.G. 20 Dec., 1968 [20 Dec., 1967], No. 60849/68. Heading H2H. An electricity supply system wherein two or more alternators feed a single network, the alternators being driven by prime movers which are provided with control circuits so as to be controlled in dependence upon the frequency and power outputs of the alternators is further provided with means to ensure equal division of a common load between the alternators. Generating units A1, A2 are connected in parallel to a common bus-bar B so as to supply a load C. Each generating unit comprises an alternator F driven by a diesel engine D the fuel supply to which is controlled by a valve E which is itself controlled by the output signal from an amplifier G. The input signal to the amplifier G is derived from a transducer H which produces a signal representing the alternator r.p.m. or frequency, a device O giving a signal representing the real power output of the alternator. The signal from the device O is fed to a function generator P which produces an output signal inversely proportional to the input signal which output signal is compared with the signal from the transducer H in a comparator N. The output signal from the comparator N is used to control a motor L by way of a device M, the motor L driving a pick-up device K so as to produce a signal representing the desired characteristic of the alternator F, this latter signal being compared with the actual speed or frequency signal from the transducer H in a device J thereby controlling the amplifier G and the fuel valve E of the diesel D. In order to control the load division between the alternators F1, F2 (Fig. 2), the signals from the devices 01, 02 are fed to the function generators 31, 32 by way of variable gain amplifiers 21, 22 the gains of these amplifiers being controlled by the voltages which appear across similar impedances 61, 62 connected between the outputs of the devices 01, 02 and a common connection T. The amplifiers 21, 22 and the function generators 31, 32 preferably comprise transistors. In order to synchronize the units A1 or A2 (Fig.1) the switch S is moved to contact a and a signal representing the bus-bar frequency is fed to a terminal R. The control system then functions to control the valve E so as to bring the unit up to synchronous speed when the unit can then be switched to the bus-bar B.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式