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11. 发明授权

US3562611A Static switching controllers for effecting repetitive connection to and disconnection from an inductive load of a dc source 失效
标题翻译：静态切换控制器，用于对直流电源的电感负载进行重复连接和断开连接
公开(公告)号：US3562611A
公开(公告)日：1971-02-09
申请号：US3562611D
申请日：1969-05-05
申请人： SEVCON ENG LTD
发明人： GURWICZ DAVID
IPC分类号： H02M3/135 , H02P7/29 , H02K23/08 , H02P5/06
CPC分类号： H02P7/29 , H02M3/135
摘要： Static switching controller using a thyristor to connect a DC source to a load there being provided control means to render the thyristor conducting, a commutating capacitor adapted to be charged from the source and to reverse bias the thyristor to terminate conduction thereof and means for preventing decay of the charge on the capacitor to a level below that required to commutate the thyristor, there being further provided a unidirectional load shunting current path which in the interval between successive periods of conduction of the thyristor operates to permit charging of the capacitor to a relatively high voltage level.

12. 发明授权

US3365640A Control means for electrical apparatus 失效
标题翻译：电气设备控制装置
公开(公告)号：US3365640A
公开(公告)日：1968-01-23
申请号：US39919864
申请日：1964-09-25
申请人： SEVCON ENG LTD
发明人： DAVID GURWICZ ISAAC
IPC分类号： B60L11/18 , H02P7/29
CPC分类号： B60L11/1805 , H02P7/29 , Y02T10/646 , Y02T10/648 , Y02T10/7005 , Y10S388/917
摘要： 1,048,997. Control of D.C. motors. SEVCON ENGINEERING CO. Sept. 23, 1964 [Oct. 5, 1963], No. 39300/63. Heading H2J. Relates to a control system for a batteryoperated motor as described in Specification 950,734 comprising a controlled rectifier pulse generator including capacitor C, and means for adjusting the pulse frequency and thereby the power applied to the motor, the current flow being maintained during the interpulse periods. A controlled rectifier SCR 3 is provided for stopping the inductive effect of the battery reducing the stored charge in the capacitor and thereby preventing turn-off of the controlled rectifier in the pulse generator. When the main current-carrying rectifier SCR 2 is switched off, capacitor C charges through rectifier SCB 1 to the peak voltage of the battery. When the battery returns to its normal open-circuit voltage, the capacitor is unable to discharge through diode D 1 since rectifier SCR 3 is blocked, the capacitor retaining the increased charge. Firing of rectifier SCR 2 discharges the capacitor C through rectifier SCR 2 , inductor L, and rectifier SCR 3 , the latter being fired by transistor TR 1 at the same instant as the rectifier SCR 2 is fired. Contactor SC short-circuits the pulse generator and connects the motor directly to the battery. Resistor R 5 and diode D 4 are connectible between the battery and the gate of the rectifier SCR 3 to ensure that the rectifier is in a condition for firing when the contactor opens. A connection including diode D 6 is provided between the anode of rectifier SCR 3 and the firing electrode of rectifier SCR 2 to ensure that the latter is not fired prematurely after opening of the contactor SC.

13. 发明授权

US3648151A Chopper circuit 失效
标题翻译： CHOPPER电路
公开(公告)号：US3648151A
公开(公告)日：1972-03-07
申请号：US3648151D
申请日：1969-08-07
申请人： SEVCON ENG LTD
发明人： GURWICZ DAVID
IPC分类号： H02P7/29 , H02M7/44
CPC分类号： H02P7/29 , Y10S388/919
摘要： A variable mark-space ratio pulse controller in which a main thyristor for controlling the supply of direct current to a load is commutated by discharge of a capacitor occuring immediately on reversal of the charge thereon so that the use of a separate thyristor which is turned on to pass discharge current from the commutating capacitor to commutate the main thyristor is avoided.
摘要翻译：一种可变标记空间比脉冲控制器，其中用于控制对负载的直流电供应的主晶闸管通过在其上反转电荷而立即发生电容器的放电而换向，以便使用单独的晶闸管导通避免了从换向电容器放电电流，使主晶闸管换向。

14. 发明授权

US3629681A Circuits for controlled battery chargers 失效
标题翻译：用于控制电池充电器的电路
公开(公告)号：US3629681A
公开(公告)日：1971-12-21
申请号：US3629681D
申请日：1970-04-08
申请人： SEVCON ENG LTD
发明人： GURWICZ DAVID
IPC分类号： H02J7/02 , H02J7/10
CPC分类号： H02J7/022
摘要： The illustrated embodiment of the invention is a circuit for a controlled battery charger comprising for connection with a source of rectified AC supply a series circuit including a semiconductor switch and having inductance and in parallel with the semiconductor switch a unidirectional conduction device in series with connections to which can be connected a battery to be charged the voltage of the battery exceeding the rectified AC supply voltage, control circuit means being provided to control the frequency of switching of the semiconductor switch whereby, in operation, during conduction of the semiconductor switch electrical energy is stored in the series circuit containing the switch as the current therethrough grows inductively while energy so stored is supplied to the battery in the intervals between conducting periods of the switch.

15. 发明专利

GB1271497A IMPROVEMENTS IN OR RELATING TO BATTERY DISCHARGE INDICATORS 未知
公开(公告)号：GB1271497A
公开(公告)日：1972-04-19
申请号：GB2363668
申请日：1968-05-17
申请人： SEVCON ENG LTD
发明人： GURWICZ DAVID
IPC分类号： G01R31/36 , H01M10/48
摘要： 1,271,497. Preventing over discharge of batteries. SEVCON ENG. Ltd. 30 April, 1969 [17 May, 1968], No. 23636/68. Heading H2H. [Also in Division G1] A battery discharge indicator incorporates a battery voltage sensing circuit which responds to the fall of battery voltage below a predetermined value to actuate an indicator, the system incorporating a switch which is actuated by a magnetic field generated by the battery current when this is above a given value so as to prevent actuation of the indicator. This ensures that the indicator will not be operated during temporary voltage drops due to heavy surge currents. In one arrangement (Fig. 1) a determined proportion of the voltage of battery 4 being monitored is tapped from resistor 15 and applied to one transistor 9 of an emitter coupled pair 7, 9. The other transistor 7 has a standard voltage from a Zener diode 1 applied to its base. Any changes due to temperature effects in the base-emitter voltage of 9 are compensated by similar changes at 7. If the battery voltage falls below a predetermined level, transistor 9 is switched off, current through the winding 13 ceases, and a pair of reed relay switch contacts controlled by the winding open. If however, there is a high current surge in the battery circuit to the load 6, a large field is produced in the winding 21 to hold the contacts closed. The contacts are used to control the operation of an indicator. In a second embodiment (Fig. 2) fall of the battery voltage is used to set a relaxation oscillator into operation. A proportion of the battery voltage is applied to the base of a transistor (37) whose emitter is normally held at the potential across a capacitor (43) charged from a Zener diode circuit (45). When the base voltage falls below the emitter, the transistor conducts and switches on a second (39) coupled back to the first so that the capacitor discharges and eventually prevents the first transistor conducting again. These oscillations are amplified and applied to a warning lamp (57). Heavy current flow in the battery circuit is used to operate a pair of contacts (61) across the warning lamp so that it is by-passed under surge current conditions. The first arrangement may be incorporated in a battery operated fork lift truck, operation of the contacts preventing the lift circuit from being operated.

16. 发明专利

CH520440A Halbleiterschaltungsanordnung zum wiederkehrenden Anschalten einer induktiven Last an eine und Abschalten der induktiven Last von einer Gleichstromquelle 未知
公开(公告)号：CH520440A
公开(公告)日：1972-03-15
申请号：CH725369
申请日：1969-05-09
申请人： SEVCON ENG LTD
发明人： DAVID GURWICZ
IPC分类号： H02M3/135 , H02P7/29 , H02P7/28 , H02P13/04

17. 发明专利

GB1263262A IMPROVEMENTS IN COMMUTATION CIRCUITS 未知
公开(公告)号：GB1263262A
公开(公告)日：1972-02-09
申请号：GB4148871
申请日：1968-02-06
申请人： SEVCON ENG LTD , RANSOMES SIMS & JEFFERIES LTD
发明人： GURWICZ DAVID , SLOAN ALBERT EVERETT
IPC分类号： H02M1/06 , H02P7/29 , H03K17/723
摘要： 1,263,262. S.C.R. circuits. SEVCON ENG. Ltd., and RANSOMES SIMS & JEFFERIES Ltd. 5 Feb., 1969 [6 Feb., 1968], No. 41488/71. Heading H3T. [Also in Divison H2] The subject-matter of this Specification is identical with that described in Specification 1,263,261 but the claims are concerned with a circuit for simultaneously commutating a plurality of semi-conductor switching devices. As shown, closure of switch 23 charges capacitor 18, which is reverse charged when a pulse from a master oscillator triggers thyristor 22. The supply of pulses to the gates of main thyristors 4, 5, from the master oscillator by way of delay circuits causes current-flow through motors 1, 2, until thyristor 17 is fired by a signal from a pulse-width regulating circuit whereupon thyristors 4, 5, are commutated. The capacitor 18 is discharged through the battery and then forward charged in excess of the battery voltage through the motors, diodes 15, 19, inductor 16 and the thyristor 17. The latter then becomes non-conductive and the cycle is repeated by firing thyristor 22. A bridge network of thyristors may be provided in series with an inductor for charging the commutating capacitor which is connected in the bridge. Pairs of thyristors in pairs of opposed arms are rendered conductive in sequence whereby the capacitor is alternately forward charged and then presented to the main thyristors with its polarity appropriate for commutation, Fig. 7 (not shown). In another arrangement the commutating capacitor is charged through the secondary winding of a transformer. A thyristor then connects the positive plate of the capacitor to the negative side of the battery, the primary winding of the transformer presenting a high impedance at this stage. As the capacitor plate which is connected to the transformer primary winding is driven negative, the main thyristors are commutated simultaneously, Fig. 8 (not shown). In a further embodiment, the capacitor is charged through a first inductor and a thyristor to a level above the supply potential. The capacitor is then reverse charged by a second inductor in series with another thyristor and in shunt with the capacitor. At the end of a fixed period, the first thyristor is rendered conductive to commutate the main thyristors, Fig. 9 (not shown).

18. 发明专利

FR2091258A5 未知
公开(公告)号：FR2091258A5
公开(公告)日：1972-01-14
申请号：FR7116255
申请日：1971-05-05
申请人： SEVCON ENG LTD , MOLYNEUX LINDSAY
IPC分类号： G01N29/024 , H01M6/50 , H01M10/48 , G01N29/00 , H01M45/00
摘要： Apparatus for detecting the evolution of gas, particularly from electric storage cells during charging of the cells, comprises a tube, inlet means for supplying the evolved gas to the tube, and electronic sensing means for detecting changes in the velocity of sound in the tube due to changes in the composition rate of evolution of the gas. In the described embodiment the sensing means consists of a transmitter mounted in the tube and emitting a series of sound pulses, a receiver in the tube spaced from the transmitter, and an electronic circuit for measuring the transit time of sound pulses travelling from the transmitter to the receiver through the gas in the tube.

19. 发明专利

DE1763492A1 未知
公开(公告)号：DE1763492A1
公开(公告)日：1972-01-13
申请号：DE1763492
申请日：1968-06-11
申请人： SEVCON ENG LTD
发明人： GURWICZ DAVID
IPC分类号： H02P7/29 , H03K3/351 , H03K17/082 , H03K17/73 , G05F1/56
摘要： 1,227,138. Control of D.C. motors. SEVCON ENG. Ltd. 7 June, 1968 [14 June, 1967], No. 27413/67. Heading H2J. In a static switching controller of the type wherein a thyristor repetitively connects and disconnects a load and a D.C. source and wherein the thyristor is switched off by a commutating capacitor forwardly charged from the source, the mean current is limited by reducing the ratio of the conducting to non-conducting periods of the thyristor in response to the current passing therethrough at the instant of commutation, this limitation occurring if a voltage dependent on the current exceeds a predetermined value which in turn is dependent on the inductance of the source/load circuit. Fig. 1 shows the application of the invention to the control of a D.C. series traction motor 2 by a main thyristor 1, a commutating capacitor 5, a turn-off thyristor 6 and a reversal thyristor 7. The voltage across the thyristor 1 is sensed by a diodecapacitor-resistor circuit 20, 21, 22 which controls, via a Zener diode 24 and transistor 25, an oscillator 9 for firing the thyristors 1, 7 at a rate dependent on the setting of an adjustable resistor 15. If upon commutation of thyristor 1, the voltage across circuit members 20, 21 exceeds a predetermined value, the Zener diode 24 breaks down to make transistor 25 conductive and so hold the relaxation oscillator 9 in a quiescent condition until the voltage across the capacitor 21 has fallen to a value enabling members 24, 25 to revert to their original conditions. Thus the firing of thyristors 1, 7 is delayed to an extent dependent on the amplitude of the transient voltage occurring on commutation of thyristor 1. The circuit comprising members 20 ... 25 may be modified, Fig. 2 (not shown), to make the firing delay more directly dependent on the amplitude of the transient voltage and hence on the current through thyristor 1. In another embodiment, Fig. 3 (not shown), the load current is sensed by a current transformer whose output controls a relaxation oscillator for firing thyristors 1, 7 in a manner similar to that already described. The current transformer may be replaced by an impedance connected in the load circuit and supplying an A.C. amplifier. The embodiment shown in Fig. 4 uses the load current on commutation to control the firing of the turn-off thyristor 6, the arrangement being such that the voltage of the capacitor 5 is increased by the transient voltage and, if the latter exceeds a predetermined value, causes breakdown of a Zener diode 105 to advance the subsequent firing of the thyristor 6 and hence the subsequent commutation of the thyristor 1. The embodiment of Fig. 3 (not shown) may be modified to control the thyristor 6 to achieve the effect of the embodiment of Fig. 4.

20. 发明专利

GB1248053A IMPROVEMENTS IN OR RELATING TO CONTROL CIRCUITS FOR SWITCHING D.C. ELECTRICAL GENERATORS TO D.C. ELECTRICAL MOTORS 未知
公开(公告)号：GB1248053A
公开(公告)日：1971-09-29
申请号：GB2363768
申请日：1968-05-17
申请人： SEVCON ENG LTD
发明人： SLOAN ALBERT EVERETT , NIXON THOMAS
IPC分类号： H02P9/00
摘要： 1,248,053. Transistor oscillators. SEVCOM ENG. Ltd. 30 April, 1969 [17 May, 1968], No. 23637/68. Heading H3T. [Also in Division H2] A relaxation oscillator 70 operates when the potential at the junction of resistors 71, 73 is below a value determined by a Zener diode 77, to supply triggering pulses to a thyristor 39. In these circumstances transistors 81, 83 conduct and discharge capacitor 89 through transformer primary 85, whereupon they cut off until 89 is recharged through resistors 75, 87. Capacitor 79 is for smoothing purposes. The arrangement is used to connect a D.C. motor to a generator after the generator voltage has been reduced (see Division H2).

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