AT312105B - Trigger circuit - Google Patents
Trigger circuitInfo
- Publication number
- AT312105B AT312105B AT674971A AT674971A AT312105B AT 312105 B AT312105 B AT 312105B AT 674971 A AT674971 A AT 674971A AT 674971 A AT674971 A AT 674971A AT 312105 B AT312105 B AT 312105B
- Authority
- AT
- Austria
- Prior art keywords
- trigger element
- voltage
- circuit
- trigger circuit
- auxiliary voltage
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/35—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region
- H03K3/352—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region the devices being thyristors
- H03K3/3525—Anode gate thyristors or programmable unijunction transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
- H03K17/725—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for ac voltages or currents
Landscapes
- Power Conversion In General (AREA)
Description
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EMI1.1
4), bei der ein Hilfsspannungsanschluss des Triggerelementes über mindestens einen Längswiderstand und einen Querkondensator mit der Hilfsspannung verbunden ist. Eine solche Schaltung ist schon aus der USA-Patentschrift Nr. 3, 514, 672 bekannt. Hiebei ist der Querkondensator ein zur Spannungsstabilisierung diendender Filter- bzw. Glättungskondensator, der ein verfrühtes Zünden eines mit seinem Steueranschluss an einem sich stetig aufladenden Kondensator eines RC-Kreises liegenden UJT verhindert. Auch bei der Erfindung liegt im allgemeinen, wie die Zeichnungen zeigen, am Steueranschluss-E bzw. A--des Triggerelementes ein RC-Ladekreis-RI Ct-. Dieser kann, wie in Fig. 3 gezeigt, an einen Spannungsteiler-RRs-mit z.
B. licht-, temperatur- oder feuchtigkeitsabhängigen Widerständen angeschlossen sein. Ist z. B.--Rs--ein lichtabhängiger Widerstand, so ergibt die Schaltung nach Fig. 3 einen kontaktlosen Dämmerungsschalter, mit einem Triac Tr, dessen Steuerschaltung aus der Gleichspannung + Ub gespeist ist. Fig. 4 zeigt eine Triggerschaltung für Wechselspannung mit einem PUT als Triggerelement und einem von diesem gesteuerten Thyristor Thy.
Die Erfindung stellt und löst die Aufgabe, bei Schaltungen der beschriebenen Art eine Hysterese, nämlich durch das Ansprechen eine Begünstigung eines weiteren Ansprechens zu erzielen. Erfindungsgemäss wird dies in der Weise erreicht, dass die aus dem Längswiderstand und dem Querkondensator bestehende Stufe zur Herabsetzung der Spannung am Hilfsspannungsanschluss im Ansprechzustand des dreipoligen Triggerelementes dient ; das in Rede stehende RC-Glied dient also nicht zur Spannungsstabilisierung am Hilfsspannungsanschluss des Triggerelementes. Beim Ansprechen des Triggerelementes, also z. B. während der Entladung des Kondensators
EMI1.2
Die Schaltung nach Fig. 4 kann als kontaktloses Wechselspannungsmessrelais dienen. Hier ergibt die Erfindung ein von elektromechanischen Relais her bekanntes Halte- bzw. Rückfallverhältnis. Auf die Löschung des Thyristors Thy soll hier nicht eingegangen werden.
Der Widerstand-R-in Fig. 2 und der Widerstand-R'-in Fig. 4 sind zur Strombegrenzung erforderlich. Der Widerstand--R'--liegt im Querzweig in Reihe mit dem Querkondensator --C2--.
Die erfindungsgemässe Triggerschaltung kann nicht nur zum Zünden von Ventilen (Thyristoren, Triacs) sondern auch zur Impulssteuerung anderer Schaltungen verwendet werden.
PATENTANSPRÜCHE :
1. Triggerschaltung mit einem dreipoligen Triggerelement, insbesondere einem Unijunktiontransistor oder einem programmierbaren Unijunktiontransistor, bei der ein Hilfsspannungsanschluss des Triggerelementes über mindestens einen Längswiderstand und einen Querkondensator mit einer Hilfsspannung verbunden ist,
EMI1.3
bestehende Stufe zur Herabsetzung der Spannung am Hilfsspannungsanschluss im Ansprechzustand des dreipoligen Triggerelementes dient.
EMI1.4
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
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EMI1.1
4), in which an auxiliary voltage connection of the trigger element is connected to the auxiliary voltage via at least one series resistor and a shunt capacitor. Such a circuit is already known from US Pat. No. 3,514,672. The shunt capacitor is a filter or smoothing capacitor which serves to stabilize the voltage and prevents premature ignition of a UJT connected to a continuously charging capacitor of an RC circuit. In the invention, too, as the drawings show, there is generally an RC charging circuit -RI Ct- at the control connection-E or A-of the trigger element. This can, as shown in Fig. 3, to a voltage divider RRs with z.
B. light, temperature or humidity-dependent resistors be connected. Is z. B. - Rs - a light-dependent resistor, the circuit according to Fig. 3 results in a contactless twilight switch, with a triac Tr, whose control circuit is fed from the DC voltage + Ub. 4 shows a trigger circuit for alternating voltage with a PUT as the trigger element and a thyristor Thy controlled by this.
The invention provides and solves the problem of achieving a hysteresis in circuits of the type described, namely to favor a further response by responding. According to the invention, this is achieved in such a way that the stage consisting of the series resistor and the cross capacitor serves to reduce the voltage at the auxiliary voltage connection in the response state of the three-pole trigger element; the RC element in question is therefore not used for voltage stabilization at the auxiliary voltage connection of the trigger element. When the trigger element responds, e.g. B. during the discharge of the capacitor
EMI1.2
The circuit according to FIG. 4 can serve as a contactless AC voltage measuring relay. Here, the invention results in a hold or dropout ratio known from electromechanical relays. The deletion of the thyristor Thy will not be discussed here.
The resistor-R- in Fig. 2 and the resistor-R'- in Fig. 4 are required to limit the current. The resistor - R '- lies in the shunt arm in series with the shunt capacitor --C2--.
The trigger circuit according to the invention can be used not only for igniting valves (thyristors, triacs) but also for pulse control of other circuits.
PATENT CLAIMS:
1. Trigger circuit with a three-pole trigger element, in particular a uni-function transistor or a programmable uni-function transistor, in which an auxiliary voltage connection of the trigger element is connected to an auxiliary voltage via at least one series resistor and a shunt capacitor,
EMI1.3
The existing stage is used to reduce the voltage at the auxiliary voltage connection in the response state of the three-pole trigger element.
EMI1.4
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT674971A AT312105B (en) | 1971-08-03 | 1971-08-03 | Trigger circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT674971A AT312105B (en) | 1971-08-03 | 1971-08-03 | Trigger circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT312105B true AT312105B (en) | 1973-12-27 |
Family
ID=3589380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT674971A AT312105B (en) | 1971-08-03 | 1971-08-03 | Trigger circuit |
Country Status (1)
| Country | Link |
|---|---|
| AT (1) | AT312105B (en) |
-
1971
- 1971-08-03 AT AT674971A patent/AT312105B/en not_active IP Right Cessation
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ELJ | Ceased due to non-payment of the annual fee |