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1. 发明专利

GB650369A Improvements relating to stand-by electrical power-supply systems 未知
公开(公告)号：GB650369A
公开(公告)日：1951-02-21
申请号：GB2903948
申请日：1948-11-09
申请人： HAROLD MARTIN HARMER , FREDERICK JOHN COOK , MESSRS HARMER AND SIMMONS LTD
IPC分类号： H02J9/06
摘要： 650,369. Stand-by supply systems; automatic control of voltage. HARMER, H. M., and COOK, F. J. [Class 38 (iv)] A condenser Cl is alternately switched across a stand-by battery B and a D.C. load LD to maintain the voltage across the latter upon conditions of failure, or low voltage, of a normal supply source, which may comprise a transformer T, rectifier WB1 and smoothing filter C2, SL1, SL2, SC. Switching is effected by a balanced armature power relay PR under the control of a sensitive relay SR having a winding O responsive to the load voltage and which normally provides a flux balancing that due to further windings M, N excited from the battery through constant current means, such as a barretter BR. The condenser C1 is thus normally maintained on charge from the battery over rectifier W1, the upper of the change-over contacts S1, S2 of relay PR, a locking winding P of relay SR and an inductor L1. The function of the last is to prevent the flow of charge, or discharge, current whilst relay PR is changing over, thereby avoiding wear on its contacts. Upon fall of load voltage, windings M, N overcome winding O of relay SR, which changes over to contacts and reverses the excitation of the winding Q of relay PR. Contacts- S1, S2 of the last relay change over, in consequence, and condenser C1 discharges through inductor L1 into the load circuit and temporarily raises its voltage, the discharge current passing through locking winding P of relay SR to delay the return of its contacts to their initial position by the voltage rise. This, however, eventually occurs, followed by change-over of relay PR and recharging of the condenser. After a time, dependent upon the capacity of the condenser and the value of the load, the voltage falls (unless restored by the normal source) to a value at which relay SR again actuates and the cycle repeats. The inductor L1 is loaded by a rectifier bridge WB2 connected to the load circuit to prevent excessive voltage rise on the condenser, when supplying the load, due to the oscillatory nature of the discharge circuit. The condenser charges, dur ng standby operation, to a voltage equal to about twice that of the battery and this voltage is maintained during normal operation by a winding X (or transformer T) and a rectifier W3. A number of condensers may replace the single condenser C1, these being charged in parallel and discharged in series, or vice versa, according to the voltage of the battery in relation to that normally required by the load. The electromagnetic relays may be replaced by electronic relays. Relay SR may also serve to start up further stand-by plant upon failure of the main source, the condenser discharge system only supplying the load during the interim period. Specification 493,362 is referred to.

2. 发明专利

GB834022A Improvements relating to the charging of secondary batteries 未知
公开(公告)号：GB834022A
公开(公告)日：1960-05-04
申请号：GB2275956
申请日：1956-07-23
申请人： HAROLD MARTIN HARMER , FREDERICK JOHN COOK
IPC分类号： H02J7/00
摘要： 834,022. Battery charging systems. HARMER, H. M., and COOK, F. J. Oct. 18, 1957 [July 23, 1956], No. 22759(56. Class 38 (4). An apparatus for charging a multi-cell battery without large variations in the terminal voltage comprises a charger C1 connected across the whole battery and supplying the mean current of a load X and a second charger C2 connected to one or a small number of cells in sequence through a stepping switch comprising a ratchet R and a pawl T operated by a coil M energized by normally closed contacts F of a relay G, F. The connections to the battery are changed by arms P, N and contacts K. Additional contacts E, operated by an extension U of the pawl, and H operated by a slowrelease relay coil D step the mechanism over an off contact L to which may be connected a counting device. The charger C2 may be of the constant-voltage type, with the coil G in series, or a constant-current or combined type with the coil G connected across its terminals. Each cell may be provided with a catalytic converter to recombine the gases produced by electrolysis. To increase the charging rate of C1 after a mains failure, the charger C1 and load X may be switched normally or automatically across part of the battery, a rectifier being connected across the switch to preserve continuity of current flow during changeover.

3. 发明专利

GB574428A Improvements in or relating to electric current converting systems comprising vibratory relays 未知
公开(公告)号：GB574428A
公开(公告)日：1946-01-04
申请号：GB1924843
申请日：1943-11-18
申请人： HAROLD MARTIN HARMER , FREDERICK JOHN COOK
IPC分类号： H02M7/62
摘要： 574,428. Converting. HARMER, H.M., and COOK, F. J. Nov. 18, 1943, No. 19248. [Class 38 (ii)] [Also in Group XXXVII] In a converting arrangement of the vibrating switch type, use is made of a plurality of vibratory relays of the kind in which frequency varies with amplitude, one relay controlling the frequency of the others. In the arrangement shown, two relays VA, VB have their associated drive coils DA, DB so connected and arranged that the relays operate at the same frequency, but with a 90 degree phase displacement, the relay VB short-circuiting the drive coil DA when it is attracted by its own coil DB whilst the relay VA short-circuits the drive coil DB after release by short-circuiting of its drive coil DA. Thus, the two transformers TA, TB are energized with a 90 degree phase displacement and their outputs when rectified by rectifiers RA, RB overlap to produce a substantially steady D.C. Modifications in which the drive coils are energized through separate contacts associated with the vibratory elements, and in which the rectifiers RA, RB are replaced - by additional contacts on the relays are described. Specification 554,712 is referred to.

4. 发明专利

GB668641A Improvements relating to voltage-regulating arrangements 未知
公开(公告)号：GB668641A
公开(公告)日：1952-03-19
申请号：GB1426049
申请日：1949-05-27
申请人： HAROLD MARTIN HARMER , FREDERICK JOHN COOK
IPC分类号： G05F1/32 , H03F9/02
摘要： 668,641. Automatic voltage control systems; converters. HARMER, H. M., and COOK, F. J. Aug. 28, 1950 [May 27, 1949], No. 14260/49. Classes 38 (ii) and 38 (iv). In a system of the type described in Specification 621,203, wherein a load voltage Vr derived from an A.C. supply Vs is regulated by an inductive/capacity circuit L, C, and one element e.g. C, of which is connected in parallel with the load R and a saturable core reactor L1 to compensate for variations of the A.C. supply and the load current by reason of the variation of the relative phase displacements of the voltage components, a magnetic amplifier a, b, c which derives variable bias from the load R is arranged to provide a bias .W which not only facilitates closer regulation but also compensates for slow changes such as the ageing of the rectifiers and changes of temperature and frequency. The biasing current in W is'dependent upon the difference between two A.C. biases, one in windings b being constant and the other c being dependent on the output voltage Vr. If when the output voltage is a minimum these biases are equal and the variable bias is greater when output is a maximum, variations of output voltages provide amplified biasing for inductance L1 through transformer W, L2. A barretter B is connected in series with windings b to maintain the current in those windings constant irrespective of variations of the load voltage Vr and a resistance Rt of zero temperature coefficient is connected in parallel with windings c so as to maintain the ratio of currents in the windings constant irrespective of temperature changes. The main A.C. exciting windings a of the amplifier are supplied from a transformer T and the biasing winding W is supplied via rectifier M and further biasing windings d on the amplifier which prevents the amplifier from " inverting " and thus ensures stability about the operating point of balance. The resistance Rc is provided so as to adjust the amplifier within the working range of the regulator. The magnetic amplifier may be applied to the regulating arrangements described in Specifications 515,207, 524,565, 554,467, 555,004 and 637,663. Constant current for the windings b may be also obtained by the arrangements described in Specifications 637,518, 637,664. The effect of the windings d may also be produced by a rectifier connected between the windings b, c or by a resistance across windings b connected in series with the rectifier M. The Provisional Specification also states that permanent magnets may be used in place of windings b. Specification 493,362 also is referred to.

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