EP0181909A1 - Circuit for producing, transferring between different voltage circuits and stabilizing an alternating current - Google Patents
Circuit for producing, transferring between different voltage circuits and stabilizing an alternating currentInfo
- Publication number
- EP0181909A1 EP0181909A1 EP19850902621 EP85902621A EP0181909A1 EP 0181909 A1 EP0181909 A1 EP 0181909A1 EP 19850902621 EP19850902621 EP 19850902621 EP 85902621 A EP85902621 A EP 85902621A EP 0181909 A1 EP0181909 A1 EP 0181909A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- input
- circuit
- output
- chopper
- inverter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/538—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration
- H02M7/53803—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration with automatic control of output voltage or current
- H02M7/53806—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration with automatic control of output voltage or current in a push-pull configuration of the parallel type
Definitions
- the invention relates to a circuit arrangement for generating, stabilizing and transmitting alternating current between circuits with different voltages, this circuit arrangement being provided with a chopper chopping a DC voltage, a current detector, a Pilter circuit, a self-oscillating semiconductor inverter and a control circuit.
- the effective value of the current is set from a pre-stabilized voltage by changing the resistance.
- Modern electronic circuits can measure the real effective Value of the real current and by feedback of which a practically perfect solution is formed in the unit performing the regulation.
- the circuits belonging to the first group are characterized by a simple, rosy design, a low puncture frequency characteristic of 50 or 100 Hz - and a low cost level.
- a disadvantage of these solutions is that they can be implemented with relatively large geometrical masses and weights, are also low in efficiency, the setting of the effective value of the alternating current is lengthy and requires laborious adjustment work, and does not always meet the requirements for accuracy .
- the functional frequency can be increased in the kHz range, which leads to a reduction in dimensions and weight and the accuracy that can be achieved depends on the quality parameters - and therefore on the price - of the circuit units used.
- the efficiency can be increased significantly by using the switching mode control.
- a disadvantage of this solution is that the measurement of the effective value of the real current is in most cases carried out in a secondary circuit, the potential of which deviates significantly from the potential of the control unit, and the measured value is passed on to the place of processing by bridging a large voltage difference is. This increases the price and the complexity of the circuit significantly.
- the invention relates to a circuit arrangement which meets these requirements.
- the invention is based on the knowledge that the change in the ratio between the mean value of the input current and the effective value of the output current of a self-oscillating inverter circuit which generates a square-wave voltage and which feeds a consumer with an ohmic-inductive character by means of a suitable change in the self-oscillation frequency sequence under an arbitrarily small one , can be held according to certain value. This ensures the possibility of mapping a signal proportional to the effective value of the output current on the control loop potential.
- the effective value of the output aroma is realized by comparing the mean value of the input current of the inverter with a set target value and by changing the DC input voltage of the inverter.
- the DC input voltage is changed by means of the chopper operating synchronously with the inverter, the switching ratio of which is determined by a controller connection.
- the regulator circuit generates a signal which depends on the deviation of the setpoint from the mean value of the input atom of the inverter.
- a current detector and filter circuit were inserted between the chopper and the inverter.
- the synchronous operation of the chopper and the inverter is advantageous because it can reduce the additional error resulting from the non-ideal square wave voltage shape. With asynchronous puncture, the amplitude symmetry of the square waves can namely output voltage of the inverter cannot be secured.
- Fig. 1 shows an embodiment of the circuit arrangement according to the invention.
- Fig. 2 shows a preferred embodiment of the circuit arrangement according to the invention.
- an unstabilized DC voltage which changes between given limits, reaches an input of a chopper 2, the point frequency of which is determined by a signal connected to its synchronization input 4, while its switching ratio is determined by a signal connected to its control input 3.
- a self-oscillating inverter 7 supplies the alternating current for a circuit whose potential deviates from the direct voltage 1, and via its synchronous signal output 8 the signal determining the puncturing frequency of the chopper 2, which is led to the synchronization input 4 of the chopper 2.
- a current detector 5 and a filter circuit 6 are arranged between the chopper 2 and the inverter 7.
- the current detector 5 generates at its output 13 a signal proportional to the output current of the chopper 2 for an input 10 of a regulator circuit 9, to the other input 11 of which a current reference signal 14 is connected.
- An output 12 of the regulator circuit 9 is connected to the control input 3 of the chopper 2 and uses it to determine the switching ratio of the chopper 2.
- the exemplary embodiment of the circuit arrangement according to the invention stabilizes the effective value of the alternating current generated by the inverter 7 such that, depending on the deviation of the output current of the chopper 2 measured by means of the current detector 5 from the current reference signal 14 by means of the regulator circuit 9, the output current of the chopper 2 is kept at a constant value.
- the filter circuit 6 connected between the chopper 2 and the inverter 7 ensures that a smoothed DC voltage reaches the input of the inverter 7.
- the input current of the filter circuit 6 represents a direct current, the size of which corresponds to the mean value of the input current of the inverter 7 and at the same time represents the output current of the inverter 7.
- the circuit arrangement thus keeps the input current of the inverter 7 at a constant value.
- the circuit arrangement according to the invention stabilizes the effective value of the alternating current transmitted between circuits with different voltages, with accuracy depending on the choice of the self-oscillation frequency.
- the circuit arrangement according to the invention is also suitable for power regulation.
- the inverter 7 consists of a timer circuit 17 fed with a stabilized voltage 20, a first transistor 15, a second transistor 16, a transformer 18 with a primary winding with a single-phase center tap, and a summing amplifier 19.
- the timer circuit 17, the first transistor 15 and the second transistor 16 form a known one Multivibrator.
- the primary center point output of the transformer 18 with a center tap is connected to the input voltage of the inverter 7, while the two primary winding ends are each led to the collectors of the transistors 15, 16.
- the secondary winding outputs of transformer 18 form the AC output of the circuit.
- the summing amplifier 19 sums the base voltages of the transistors 15, 16, and the output of the summing amplifier 19 forms the synchronous signal output 3 of the inverter 7.
- the chopper 2 is provided with a chopper circuit 22 known per se and a comparator 21.
- the supply of the timer circuit securing the self-oscillation frequency of the inverter 7 and the base current of the transistors with a separately stabilized voltage has the advantage that the base currents of the transistors are not secured by the input of the inverter and thus do not flow via the current detector. In the opposite case, this would lead to an additional error. As a result of the puncture principle of the astable multivibrator, the sum of the base voltages gives the
- Transistors approximately a triangular oscillation, the repetition frequency of which is twice the self-oscillation frequency. This reaches the non-inverting input of the comparator 21 and thus simultaneously secures the voltage required for pulse width modulation of the chopper circuit 22.
- the non-inverting input of the comparator 21 is connected to the output 12 of the regulator circuit 9, while the output of the comparator 21 is connected to a logic control input 23 of the chopper circuit 22.
- the chopper 2 functions symmetrically in every half period of the output voltage of the inverter, thereby ensuring the amplitude symmetry of the output voltage of the inverter 7 and thus the elimination of the additional errors.
- the circuit arrangement according to the invention is provided with the following advantageous properties:
- the circuit arrangement according to the invention has a simple structure, good efficiency, can be realized with small dimensions and is inexpensive.
Abstract
Circuit pour produire, transférer entre des circuits de tension différente et stabiliser un courant alternatif, comportant un échantillonneur (2) doté d'une entrée de synchronisation (4) et d'une entrée de régulation (3), un détecteur de courant (5), un circuit de filtre (6), un inverseur (7) auto-hétérodyne produisant une tension carrée et doté d'une sortie de signal synchrone (8) et un circuit de réglage (9). La caractéristique de la présente invention est qu'une tension continue (1) se modifiant dans des limites déterminées est appliquée via l'échantillonneur (2), le détecteur de courant (5) et le circuit de filtre (6) à une entrée de l'inverseur auto-hétérodyne (7) dont la sortie de signal synchrone (8) est amenée à l'entrée de synchronisation (4) de l'échantillonneur (2). Une sortie (13) du détecteur de courant (5) fournissant un signal proportionnel à la moyenne de courant se raccorde à une entrée (10) du circuit de réglage (9), alors qu'un signal de référence (14) déterminant la valeur du courant est amené à l'autre entrée du circuit de réglage (9). La sortie du circuit de réglage (9) est reliée à l'entrée de régulation (3) de l'échantillonneur (2). La sortie de l'inverseur (7) forme simultanément la sortie de courant alternatif du circuit.Circuit for producing, transferring between circuits of different voltage and stabilizing an alternating current, comprising a sampler (2) provided with a synchronization input (4) and a regulation input (3), a current detector (5 ), a filter circuit (6), an auto-heterodyne inverter (7) producing a square voltage and provided with a synchronous signal output (8) and an adjustment circuit (9). The characteristic of the present invention is that a direct voltage (1) modifying within determined limits is applied via the sampler (2), the current detector (5) and the filter circuit (6) to an input of the auto-heterodyne inverter (7) whose synchronous signal output (8) is brought to the synchronization input (4) of the sampler (2). An output (13) of the current detector (5) providing a signal proportional to the average current is connected to an input (10) of the adjustment circuit (9), while a reference signal (14) determining the value current is supplied to the other input of the adjustment circuit (9). The output of the control circuit (9) is connected to the control input (3) of the sampler (2). The output of the inverter (7) simultaneously forms the alternating current output of the circuit.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HU181684 | 1984-05-10 | ||
HU181684A HU190567B (en) | 1984-05-10 | 1984-05-10 | Circuit arrangement for generating alternating current, for transferring thereof between circuits with different voltage and for stabilizing thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0181909A1 true EP0181909A1 (en) | 1986-05-28 |
Family
ID=10956333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19850902621 Withdrawn EP0181909A1 (en) | 1984-05-10 | 1985-05-09 | Circuit for producing, transferring between different voltage circuits and stabilizing an alternating current |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0181909A1 (en) |
JP (1) | JPS61502161A (en) |
DD (1) | DD233898A1 (en) |
HU (1) | HU190567B (en) |
WO (1) | WO1985005508A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4755696A (en) * | 1987-06-25 | 1988-07-05 | Delco Electronics Corporation | CMOS binary threshold comparator |
US4962323A (en) * | 1989-07-12 | 1990-10-09 | National Semiconductor Corporation | High speed auto zero comparator |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1127611A (en) * | 1955-06-08 | 1956-12-20 | Process for painting, lacquering or varnishing rattan piths and apparatus for carrying out this process | |
NL135266C (en) * | 1960-06-29 | |||
US3402301A (en) * | 1964-11-04 | 1968-09-17 | Robert F. Gibb | Load responsive inverter |
DE1930643A1 (en) * | 1969-06-18 | 1971-01-07 | Siemens Ag | Circuit arrangement for keeping the discharge current from gas discharge tubes, in particular gas lasers, constant |
US3775702A (en) * | 1972-03-16 | 1973-11-27 | North Electric Co | Transistor inverter circuit for supplying constant current output |
DE2621763A1 (en) * | 1976-05-15 | 1977-11-24 | Olympia Werke Ag | Blocking transformer power pack operation - controls differential amplifier input voltages by different variables with amplifier output voltage control |
FR2380666A1 (en) * | 1977-02-14 | 1978-09-08 | Cii Honeywell Bull | CUTOUT CONTROL SYSTEM FOR CONVERTER IN A CONTINUOUS POWER SUPPLY |
CA1120600A (en) * | 1977-09-23 | 1982-03-23 | Heikki K.J. Kanerva | Procedure for regulating and stabilizing the intensity level of the radiation of an x-ray source and an x-ray source where this procedure is used |
JPS6024664B2 (en) * | 1978-07-07 | 1985-06-14 | ソニー株式会社 | Switching type power supply circuit |
DE2944334A1 (en) * | 1979-11-02 | 1981-05-14 | Siemens AG, 1000 Berlin und 8000 München | Electric traction vehicle control circuit - uses pulse control system for thyristor bridge circuit between asynchronous machine and current collector |
DE3008312C2 (en) * | 1980-03-04 | 1985-04-25 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Two-point current controller |
GB2098367B (en) * | 1981-05-08 | 1985-03-06 | Marconi Co Ltd | A controllable power source |
AT372228B (en) * | 1981-07-27 | 1983-09-12 | Karcagi Altalanos Tech | DC-CHOPPER CIRCUIT ARRANGEMENT WITH A THYRISTOR, IN PARTICULAR FOR POWERING A DC-MOTOR |
DE3130410A1 (en) * | 1981-07-31 | 1983-02-17 | Siemens AG, 1000 Berlin und 8000 München | Analog/digital telecommunications system |
JPS58141599U (en) * | 1982-03-18 | 1983-09-24 | 株式会社 モリタ製作所 | Medical X-ray irradiation power supply device |
-
1984
- 1984-05-10 HU HU181684A patent/HU190567B/en not_active IP Right Cessation
-
1985
- 1985-05-09 JP JP50215685A patent/JPS61502161A/en active Pending
- 1985-05-09 EP EP19850902621 patent/EP0181909A1/en not_active Withdrawn
- 1985-05-09 WO PCT/HU1985/000029 patent/WO1985005508A1/en not_active Application Discontinuation
- 1985-05-10 DD DD27620585A patent/DD233898A1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO8505508A1 * |
Also Published As
Publication number | Publication date |
---|---|
HUT37307A (en) | 1985-11-28 |
WO1985005508A1 (en) | 1985-12-05 |
JPS61502161A (en) | 1986-09-25 |
DD233898A1 (en) | 1986-03-12 |
HU190567B (en) | 1986-09-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19851216 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR NL |
|
17Q | First examination report despatched |
Effective date: 19870901 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19880312 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HERMANN, IMRE Inventor name: MUSTO, FERENC Inventor name: ARELDT, GYOERGY Inventor name: MAGYAR, PETER Inventor name: GAJASZ, ZOLTAN Inventor name: SZASZ, KAROLY Inventor name: VARJASI, ISTVAN Inventor name: KARPATI, ATTILA Inventor name: IPSITS, IMRE Inventor name: HUSZTI, GYOERGY Inventor name: TUSCHAK, ROBERT Inventor name: FARKAS, ISTVAN |