DE3228001C2 - Circuit arrangement for potential-free transmission of analog signals in converters - Google Patents
Circuit arrangement for potential-free transmission of analog signals in convertersInfo
- Publication number
- DE3228001C2 DE3228001C2 DE19823228001 DE3228001A DE3228001C2 DE 3228001 C2 DE3228001 C2 DE 3228001C2 DE 19823228001 DE19823228001 DE 19823228001 DE 3228001 A DE3228001 A DE 3228001A DE 3228001 C2 DE3228001 C2 DE 3228001C2
- Authority
- DE
- Germany
- Prior art keywords
- voltage
- signals
- emitting diodes
- comparators
- light
- 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.)
- Expired
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
- 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
- H02M7/5387—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 bridge configuration
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Pulse Circuits (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
Zur potentialfreien Übertragung zumindest zweier analoger Signale vom Leistungsteil eines Umrichters auf den Steuerungsteil bei möglichst geringem Stromverbrauch ist eine Schaltungsanordnung mit Opto-Kopplern (4) vorgesehen. Die Leuchtdioden (8, 9) der Opto-Koppler (4) sind dabei in Reihe geschaltet und je zu übertragendem Signal (U ↓1, U ↓2) durch einen von einem Komparator (2, 3) gesteuerten Schalter (11, 12) überbrückbar. Den Komparatoren (2, 3) wird jeweils ein zu übertragendes Signal (U ↓1, U ↓2) und als Vergleichsspannung eine von einem gemeinsamen Sägezahngenerator (1) erzeugte lineare Sägezahnspannung zugeführt, wobei eines der zu übertragenden Signale gleichzeitig der Energieversorgung der Leuchtdioden, der Komparatoren und des Sägezahngenerators dient. Im Takte der durch die Komparatoren (2, 3) geschlossenen Schalter (11, 12) geben die Leucht dioden (8, 9) pulsbreitenmodulierte Signale ab. Die Fotoelemente (13, 14) der Opto-Koppler steuern aufgrund dieser Signale als Analogschalter verwendete, an eine gemeinsame Referenzspannungsquelle (16) gelegte CMOS-Gatter (5, 15) mit nachgeschalteten Tiefpaßfiltern (6, 7), an deren Ausgängen die übertragenden Signale (U ↓1Δ, U ↓2Δ) zur Verfügung stehen.A circuit arrangement with opto-couplers (4) is provided for the potential-free transmission of at least two analog signals from the power section of a converter to the control section with the lowest possible power consumption. The light-emitting diodes (8, 9) of the opto-couplers (4) are connected in series and depending on the signal to be transmitted (U ↓ 1, U ↓ 2) by a switch (11, 12) controlled by a comparator (2, 3) bridgeable. The comparators (2, 3) are each supplied with a signal to be transmitted (U ↓ 1, U ↓ 2) and, as a comparison voltage, a linear sawtooth voltage generated by a common sawtooth generator (1), with one of the signals to be transmitted simultaneously supplying energy to the light emitting diodes, the comparators and the sawtooth generator are used. At the rate of the switches (11, 12) closed by the comparators (2, 3), the light-emitting diodes (8, 9) emit pulse-width-modulated signals. Based on these signals, the photo elements (13, 14) of the opto-couplers control CMOS gates (5, 15) with downstream low-pass filters (6, 7) that are used as analog switches and are connected to a common reference voltage source (16) (U ↓ 1Δ, U ↓ 2Δ) are available.
Description
Um die Restweliigkeit bei möglichst kleiner Übertragungsverzögerung gering zu l/alten, sind Tiefpaßfilter 6, 7 vorgesehen, die den Gattern 5,15 nachgeschaltet sind. Als Tiefpaßfilter können z. B. Butterworth-Filter zweiter oder höherer Ordnung verwendet werden.About the residual ripple with the smallest possible transmission delay low to 1 / old, low-pass filters 6, 7 are provided, which are connected downstream of the gates 5, 15. As a low-pass filter, for. B. Butterworth filters of second or higher order can be used.
Durch Mittelwertbildung der durch das Schalten der Gatter 5, 15 hervorgerufenen pulsbreitenmodulierten Rechtecksignale liegen an den Ausgängen der Tiefpaßfilter 6,7 auf OV bezogene Gleichspannungssignale V1, If-,, die in gewünschter Weise den hohen Gleichspannungssignalen Uu U2 proportional sind.By averaging the pulse-width-modulated square-wave signals caused by switching gates 5, 15, DC voltage signals V 1 , If- related to OV are present at the outputs of low-pass filters 6, 7, which are proportional to the high DC voltage signals U and U 2 in the desired manner.
In Fig. 2 ist der in Fig. 1 mit 1 bezeichnete Sägezahngenerator im einzelnen abgebildet. Der Sägezahngenerator weist einen Komparator NlA auf, der aus einer mit + angedeuteten Gleichspannungsquelle gespeist wird. Diese Gleichspannungsquelle ist die in Fig. 1 mit 10 bezeichnete Versorgung, die aus dem hohen Gleichspannungs-Analogsignal U1 über den Widerstand R und die Reihenschaltung der Leuchtdioden 8, 9 gespeist wird.The sawtooth generator designated by 1 in FIG. 1 is shown in detail in FIG. The sawtooth generator has a comparator N1A, which is fed from a DC voltage source indicated by +. This DC voltage source is the supply designated 10 in FIG. 1 , which is fed from the high DC voltage analog signal U 1 via the resistor R and the series connection of the light-emitting diodes 8, 9.
An den invertierenden Eingang des Komparators /VL4 ist ein Kondensator Ci gegen O-Potentia! angeschlossen, der über eine Diode V7 aus einuf Stromquelle, die aus einem Transistor H9, Dioden V4, V5 und Widerständen RT, RS gebildet ist, aufgeladen werden kann.At the inverting input of the comparator / VL4 is a capacitor Ci against O-Potentia! connected, which can be charged via a diode V7 from a current source, which is formed from a transistor H9, diodes V4, V5 and resistors RT, RS .
Der Kondensator Ci ist über eine Diode V9 über eine Stromsenke, die aus einem Transistor K20, Dioden KIl, VM und einem Widerstand RVb gebildet ist und an den Ausgang des Komparators NlA angeschlossen ist, entladbar.The capacitor Ci can be discharged via a diode V9 via a current sink which is formed from a transistor K20, diodes KIl, VM and a resistor RVb and is connected to the output of the comparator NlA .
Der nicht invertierende Eingang des Komparators NlA ist über eine Diode VS sowie Zener-Dioden V13, V15 mit dem O-Potential verbunden. Der nicht invertierende Eingang des Komparators NlA liegt ferner über einen ohmschen Widerstand RIl an dem potentialmäßig auch die Komparatoren 2, 3 festlegenden Verbindungspunkt zwischen den Zener-Dioden K13 und V15. Der Zener-Diode V15 ist ein Kondensator Cl parallelgeschaltet. The non-inverting input of the comparator NlA is connected to the 0 potential via a diode VS and Zener diodes V13, V15. The non-inverting input of the comparator NlA is also connected via an ohmic resistor RIl to the connection point between the Zener diodes K13 and V15, which also defines the comparators 2, 3 in terms of potential. The Zener diode V15 is a capacitor C1 connected in parallel.
Die Basis des Transistors K20 der Stromsenke liegt über einen Widerstand R9 am Potentialabschluß +, den Anodenanschluß einer Diode V6 an dem Veibindungspunkt zwischen dem Transistor H9 der Stromquelle und der Diode Vl sowie den Kathodenanschluß einer Diode KlO am nichtinvertierenden Eingang des Komparators NlA. The base of the transistor K20 of the current sink is connected to the potential terminal + via a resistor R9 , the anode connection of a diode V6 to the connection point between the transistor H9 of the current source and the diode Vl and the cathode connection of a diode KlO to the non-inverting input of the comparator NlA.
Der Sägezahngenerator arbeitet wie folgt: Nach dem Aufbau der Versorgungsspannung sei der Kondensator C3 zunächst völlig entladen, d. h. der invertierende Eingang des Komparators NlA liegt auf 0-Potential. Der nicht invertierende Eingang des Komparators NlA hat dagegen ein Potential, das der Z-Spannung der Zener-Dioden K13 und K15 sowie der Schwellenspannung der Diode VS entspricht. Der Ausgang des Kornparators NlA ist daher inaktiv.The sawtooth generator works as follows: After the supply voltage has been built up, let the capacitor C3 initially be completely discharged, ie the inverting input of the comparator NlA is at 0 potential. The non-inverting input of the comparator NlA , on the other hand, has a potential which corresponds to the Z-voltage of the Zener diodes K13 and K15 and the threshold voltage of the diode VS. The output of the comparator NlA is therefore inactive.
Der Kondensator Ci wird über die Diode K7 aus der Stromquelle mit dem Transistor V19 aufgeladen, bis der invertierende Eingang des Komparators .VlA positiver wird als der nicht invertierende; dadurch geht der Aus- «o gang des Komparators aktiv auf O-Potential, Über die 'Diode V6 sowie die Dioden KIl und K12 wird dann der aus dem Transistor K19 getriebene Strom nach O-Potential abgeleitet. Gleichzeitig wird der Kondensator Ci über die Diode K9 und die Stromsenke mit dem Transistör K20 linear entladen. Der nicht invertierende Eingang des Komparators Λ/.1Λ liegt während dieser Zeit mittels des Widerstands RIl auf der Z-Spannung der Zener-Diode K15. Unterschreitet die Spannung an dem Kondensator Ci diese Spannung, so wird der Ausgang des Komparators NlA inaktiv und die Aufladung des Kondensators Ci erfolgt aufs Neue.The capacitor Ci is charged via the diode K7 from the current source with the transistor V19 until the inverting input of the comparator .VlA is more positive than the non-inverting; As a result, the output of the comparator goes actively to 0 potential. The current driven from transistor K19 is then diverted to 0 potential via diode V6 and diodes K11 and K12. At the same time, the capacitor Ci is linearly discharged via the diode K9 and the current sink with the transistor K20. The non-inverting input of the comparator Λ / .1Λ is during this time by means of the resistor RIl on the Z-voltage of the Zener diode K15. If the voltage at the capacitor Ci falls below this voltage, the output of the comparator NlA becomes inactive and the capacitor Ci is charged again.
Am Kondensator Ci steht also eine Sägezahnspannung zur Verfugung, deren Amplitude durch die Z-Spannung der Zener-Diode K13 und die Schwellenspannung der Diode VS sowie durch die Verzögerungszeit des Komparators NlA bestimmt wird. Diese Sägezahnspannung wird über die Leitung 16 den Komparatoren 2 und 3 zugeführt.A sawtooth voltage is therefore available at the capacitor Ci , the amplitude of which is determined by the Z voltage of the Zener diode K13 and the threshold voltage of the diode VS as well as by the delay time of the comparator NlA . This sawtooth voltage is fed to the comparators 2 and 3 via the line 16.
Um eine durch die Ansprechverzögerungszeit des Komparators NlA bedingte Unterentladung des Kondensators Ci und einen daraus resultierenden Offsetfehler klein zu halten, wird die Entladezeit möglichst groß gegenüber der Aufladezeit gewährt.In order to keep an underdischarge of the capacitor Ci caused by the response delay time of the comparator NlA and a resulting offset error small, the discharge time is granted as long as possible compared to the charge time.
Hierzu I Blatt ZeichnungenFor this purpose I sheet drawings
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19823228001 DE3228001C2 (en) | 1982-07-24 | 1982-07-24 | Circuit arrangement for potential-free transmission of analog signals in converters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19823228001 DE3228001C2 (en) | 1982-07-24 | 1982-07-24 | Circuit arrangement for potential-free transmission of analog signals in converters |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3228001A1 DE3228001A1 (en) | 1984-01-26 |
DE3228001C2 true DE3228001C2 (en) | 1986-11-13 |
Family
ID=6169439
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19823228001 Expired DE3228001C2 (en) | 1982-07-24 | 1982-07-24 | Circuit arrangement for potential-free transmission of analog signals in converters |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3228001C2 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2632380C3 (en) * | 1976-07-19 | 1982-09-09 | Danfoss A/S, 6430 Nordborg | Protection circuit arrangement for an inverter |
DE2714627A1 (en) * | 1977-03-30 | 1978-10-12 | Licentia Gmbh | Monitoring circuit detecting current flowing in thyristor - operates by measuring voltage drop between gate and cathode of thyristor |
-
1982
- 1982-07-24 DE DE19823228001 patent/DE3228001C2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE3228001A1 (en) | 1984-01-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
8125 | Change of the main classification |
Ipc: H02P 13/16 |
|
8125 | Change of the main classification |
Ipc: H02M 1/00 |
|
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8320 | Willingness to grant licences declared (paragraph 23) | ||
8339 | Ceased/non-payment of the annual fee |