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公开(公告)号：US3833848A
公开(公告)日：1974-09-03
申请号：US22145272
申请日：1972-01-27
Applicant: DANFOSS AS
Inventor： PETERSEN T
Abstract: The invention relates to a D.C.-fed regulated direct current voltage supply for feeding an inverted converter connected to a three phase motor. The voltage supply has current sensing means to which is connected voltage regulating means. The voltage regulating means is responsive to a maximum predetermined current value to reduce the voltage to prevent the current from exceeding the predetermined value. The voltage regulating means includes an SCR or equivalent which is opened and closed by impulses. The open and/or closed periods are of varying duration to prevent the current from exceeding the predetermined value.
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公开(公告)号：DK123500B
公开(公告)日：1972-06-26
申请号：DK602569
申请日：1969-11-14
Applicant: DANFOSS AS
Inventor： PETERSEN T
Abstract: 1,229,362. Electrical assemblies. DANFOSS A.S. 7 Nov., 1969 [14 Nov., 1968], No. 54705/69. Heading H1B. Electrical apparatus comprises a power section 2, at least part of which is accommodated in a container 1 of insulating cooling fluid 4, and an associated control section 11, 12, 13, 17, 21, 22, the top of the container being covered by an insulating plate 7 containing connection orifices (28) (Fig. 2, not shown) and having a metal coating 5 deposited at least in the vicinity of each of these orifices, the orifices being sealed by the introduction of connecting elements (26) and by solder (54) (Fig. 4, not shown) joining the connecting elements to the metal coating (7). A metal screening plate 8, alone or in conjunction with the insulating plate, supports the power section. The metal coating 5 on the underside of the insulating plate 7 constitute components of a printed circuit which is used to connect the switching elements, control section and the power section. A number of the connecting elements may be arranged in a row (42) (Fig. 3, not shown) and may project through a common hole (30) (Fig. 2, not shown) in the metal screening plate.
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公开(公告)号：CA934816A
公开(公告)日：1973-10-02
申请号：CA41077
申请日：1969-01-24
Applicant: DANFOSS AS
Inventor： PETERSEN T , JENSEN A
IPC: H02K20060101 , H02M5/45 , H02P20060101 , H02P27/06
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公开(公告)号：SE356859B
公开(公告)日：1973-06-04
申请号：SE1157868
申请日：1968-08-28
Applicant: DANFOSS AS
Inventor： JENSEN A , PETERSEN T
Abstract: 1,202,466. Control of A.C. motors. DANFOSS A/S. 20 Aug., 1968 [29 Aug., 1967], No. No. 39716/68. Heading H2J. [Also in Division H3] Crossovers between a constant amplitude, variable frequency waveform R, Fig. 4, and a constant and higher frequency, at least parttriangular, variable slope waveform e are sensed by a comparator (11, Fig. 1, not shown), which triggers a square wave generator to produce a width-modulated waveform g R suitable for motor control. The variable frequency waveform R is one of the three phase outputs R, S, T of an oscillator (2) each of which outputs is fed through a resistance (7), which may be variable, to a respective comparator (11) which also receives through a resistance 8, also optionally variable, the output e of an oscillator (1) producing the higher frequency waveform. The resulting square waves, g R , g s , g T are used to control a three-phase motor. A single D.C. signal (B) varies directly the frequency of the wafeforms R, S. T. and varies inversely the slope of the waveform e; and the square waves g R , g s , g T each have an average value whose magnitude is inversely proportional to the slope of e, and whose frequency of variation is directly proportional to the frequency of the waveforms R, S, T. Thus a motor controlled by the square waves has its speed varied at constant torque by the single control voltage (B). Each comparator 11 may include a subtractor and a high amplification null detector; or it may be a Schmitt trigger. In modifications, the control D.C. (B, Fig. 5, not shown) directly controls the oscillator (2), and inversely controls (at 29) a square wave (from 3c) which is then integrated (at 31) to give the variable slope signal e which is fed as before to the comparators (6). A slope detector (33, Fig. 6, not shown) may he added to this arrangement. Alternatively, the D.C. bias (B, Fig. 7, not shown) may be applied to directly control (at 34) the amplitude of the square waves (from 30) which are again integrated (at 31) and applied to the comparators (b), the slope detector (33) in this case providing the conttol signal (B 1 ), inversely proportional to the D.C. control signal (B), for the oscillator (2). The slope detector (Fig. 5, not shown) has a transistor (35) whose base receives the signal e and whose emitter receives the signal e without the square pulses 28 on the peaks. The transistor (35) and a complementary transistor (36) conduct for the period of each pulse (28), the widths of which vary with the slope of the waveform e. The output of the transistor (36) is smoothed and applied to an emitter follower transistor (42) which provides the (B 1 ) signal inversely proportional to (B).
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公开(公告)号：SE352496B
公开(公告)日：1972-12-27
申请号：SE84669
申请日：1969-01-22
Applicant: DANFOSS AS
Inventor： JENSEN A , PETERSEN T
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Patent Agency Ranking
公开(公告)号：SE351090B
公开(公告)日：1972-11-13
申请号：SE98169
申请日：1969-01-24
Applicant: DANFOSS AS
Inventor： JENSEN A , PETERSEN T
IPC: H02M1/08 , H02M7/515 , H02M7/525 , H03K3/351 , H03K4/94 , H03K5/01 , H03K5/153 , H03K5/1536 , H03K17/723
Abstract: 1,249,186. D.C. to A.C. converters. DANFOSS A.S. 6 Jan., 1969 [26 Jan., 1968], No. 728/69. Heading H2F. A three-phase bridge inverter (Fig. 1) having a common quenching rectifier E7, is controlled by an arrangement as shown in Fig. 2, wherein a 3-phase square waveform generator 8 produces outputs T, S, R at the required inverter output frequency, each half-wave of the outputs being used to send a train of h, f pulses to fire a respective one of the rectifiers E1-E6 by means of firing pulse circuits 13, 14, 15. In addition the square waveforms T, S, R, are summated, differentiated and rectified in a unit 12 (detailed Fig. 3, not shown) to produce from the leading and trailing edges of the resulting square waveform d at three times the inverter frequency a train e of quenching spikes at 6 times the inverter output frequency. The quenching pulses fire E7 (which is extinguished immediately afterwards by means not described) to turn OFF all conducting rectifiers. A main rectifier is fired again immediately after its quenching if its proper conduction period is not ended, a train of H.F. impulses being sent during the firing periods for rectifiers E1 to E6 as illustrated in Figs. 5f to 5l (not shown). Firing pulse units for main rectifiers.-A relaxation oscillator-R4, C1, L1 and unijunction transistor Tr3 (Fig. 4)-produces oscillations, e.g. 10-100 kc./s., which are passed by leads 16, 17 to firing pulse units 13, 14, 15. In unit 13, for example, as shown, when a positive half-wave from generator 8 output T is received at terminal 18, a current can flow only through diode D4, NPN transistor Tr5 and the primary of a transformer T3, and a train of high-frequency firing pulses are applied to rectifier E1 from output 1 during the whole of half-wave period. When a negative half-wave is received at 18 current flows through diode D3, PNP transistor Tr4 and the primary of transformer T2 producing firing pulses from output 2 to E2. Diodes D5, D6 ensure pulses of one polarity only at the outputs 1, 2. Control waveform generator.-The generator 8 (one unit of which is detailed, Figs. 6, 7, not shown) comprises a ring counter arrangement formed by a loop of three similar units 9, 10, 11 (Fig. 2) each of which integrates the square wave output of the preceding unit to form a constant amplitude trapezoidal signal from which is produced a constant amplitude square waveform output. The three outputs T, S, R are thereby relatively displaced by 120 degrees. By altering the amplitude of the square wave signals the frequency can be altered, e.g. proportional to the inverter output voltage, whereby a motor powered by the inverter maintains a constant magnetization independent of speed.
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公开(公告)号：SE350886B
公开(公告)日：1972-11-06
申请号：SE1157768
申请日：1968-08-28
Applicant: DANFOSS AS
Inventor： JENSEN A , PETERSEN T
IPC: H02M1/08
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公开(公告)号：NO129716B
公开(公告)日：1974-05-13
申请号：NO495370
申请日：1970-12-24
Applicant: DANFOSS AS
Inventor： PETERSEN T , HENRIKSEN N
Abstract: The invention relates to a reverse voltage circuit for thyristors which has particular application to an inverter circuit. The basic circuit includes a thyristor, a first diode, and a transformer having the primary winding thereof in series relation to the diode. The first diode and the transformer primary winding are in parallel relation to the thyristor with the diode being antiparallel relative to the thyristor. The transformer secondary winding and a second diode are in series and a D.C. voltage source biases the second diode in a counter direction relative to the secondary winding. With this circuit higher reverse voltages are obtained having relatively lengthy durations to effect switching off of a thyristor in a satisfactory manner.
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公开(公告)号：SE363548B
公开(公告)日：1974-01-21
申请号：SE1760970
申请日：1970-12-28
Applicant: DANFOSS AS
Inventor： PETERSEN T , HENRIKSEN N
Abstract: The invention relates to a reverse voltage circuit for thyristors which has particular application to an inverter circuit. The basic circuit includes a thyristor, a first diode, and a transformer having the primary winding thereof in series relation to the diode. The first diode and the transformer primary winding are in parallel relation to the thyristor with the diode being antiparallel relative to the thyristor. The transformer secondary winding and a second diode are in series and a D.C. voltage source biases the second diode in a counter direction relative to the secondary winding. With this circuit higher reverse voltages are obtained having relatively lengthy durations to effect switching off of a thyristor in a satisfactory manner.
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公开(公告)号：SE339043B
公开(公告)日：1971-09-27
申请号：SE1157668
申请日：1968-08-28
Applicant: DANFOSS AS
Inventor： JENSEN A , PETERSEN T
Abstract: 1,250,195. D.C. to A.C. static inverters. DANFOSS A.S. 13 Aug., 1968 [29 Aug., 1967], No. 38615/68. Heading H2F. In a D.C./A.C. inverter, it is arranged that commutating capacitors C1, C2, Fig. 3, are always charged up before their associated load rectifiers ES2, ES4 are fired. Thyristors ES1, ES3 are first fired sequentially to charge up the commutating capacitors C1, C2, via R2 and R1 respectively, in preparation for subsequently effecting the turn-off of load current thyristors ES2, ES4. Thyristor ES2 is then fired and passes load current via a blocking diode E2 and choke L3 to an output point W. At the same time the charge on C1 is reversed by current flowing through ES2, diode El and a choke L1, and in addition ES1 is blocked. C2 also receives a supplementary charge, which will offset any leakage, by current flowing from L3 by way of diode E5 so long as thyristor ES3 remains conducting. ES1 is then fired whereby C1 discharges to turn off ES2. Thus a positive half wave of square waveform has been passed to the output phase terminal from the centre tap of L3. Immediately thereafter the load thyristor ES4 is fired and it passes, via diode E5, a negative half wave to the output terminal, a sequence as for ES2 being repeated. If the load is inductive, current continues to flow in the same direction after the conducting load thyristor is blocked. This current will flow through freewheel diodes E6 and E8 or E3, E 7 as the case may be, until it is reversed when the other load thyristor conducts. The firing pulse circuit as shown in Fig. 1, produces square waveforms b, b 1 in antiphase, from a null detector 1, which are differentiated at 4, 9 and fed to impulse transformers 10, 13 to produce firing pulses i 1 , i 2 for the quenching thyristors ES1, ES3. In addition, delayed pulses Z 1 , Z 2 to fire the load thyristors ES2, ES4 are derived from b, b 1 by first passing b, b 1 through delay circuits 5, 8 before differentiating at 6, 9.
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