WO1990000835A1 - Signal conditioning device - Google Patents

Signal conditioning device Download PDF

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Publication number
WO1990000835A1
WO1990000835A1 PCT/GB1989/000764 GB8900764W WO9000835A1 WO 1990000835 A1 WO1990000835 A1 WO 1990000835A1 GB 8900764 W GB8900764 W GB 8900764W WO 9000835 A1 WO9000835 A1 WO 9000835A1
Authority
WO
WIPO (PCT)
Prior art keywords
resistance
led
nodes
reactive
electric
Prior art date
Application number
PCT/GB1989/000764
Other languages
French (fr)
Inventor
Vivian Jude Amourgam
Original Assignee
Vivian Jude Amourgam
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vivian Jude Amourgam filed Critical Vivian Jude Amourgam
Publication of WO1990000835A1 publication Critical patent/WO1990000835A1/en

Links

Classifications

    • 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
    • H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
    • H03K17/795—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors
    • H03K17/7955—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors using phototransistors
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/257—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M5/2573—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with control circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/30—Modifications for providing a predetermined threshold before switching
    • H03K17/305—Modifications for providing a predetermined threshold before switching in thyristor switches

Definitions

  • This invention relates to a signal conditioning device fo electric-reactively driving in a practical manner a family o semiconductor devices commonly known as LIGHT EMITTING DIODES (hereinafter referred to as LED's), by means of an alternatin current and voltage, (hereinafter referred to as a.c. or a.c. power sources, or the mains), and operating with electrica pressures of upto 250 Volts.
  • a.c. or a.c. power sources hereinafter referred to as a.c. power sources, or the mains
  • a signal conditioning device to operate at a.c. voltages of upto 250 Volts and comprising a triac, two zener diodes, a suppression type 250 V a.c. capacitor, three resistances and a metal oxide varistor suppression device configured and arranged in accordance with figure 1.
  • An LED contained within an opto coupler device which is a semiconductor device which contains an LED and a light sensitive circiut electrically isolated from the LED.
  • the light sensitive circuit reacts accordingly to the active or passive state of the LED.
  • An LED which contains within its body an integrated circuit which is inserted to innovate control of the active or passive state of the LED, commonly known as flashing LED's.
  • An LED which, as above, is a flashing LED but which also incorporates within its body a second independent, LED, usually operating at a different electromagnetic radiation wavelength, (a different colour).
  • the second LED may or may not have common electrical connection points with the first flashing LED. Both LED's may operate concurrently.
  • a tricolour LED comprising of two LED's operating independently and at different wavelengths and contained within the same body and where both LED's may operate
  • the two LED's may or may not have a common electrical connection point.
  • circuits which surround and interact electrically and optically with the signal conditioning device.
  • Substitute sub-circuits which may be introduced into the existing sub-circuits of the signal conditioning device.
  • Figure 1 shows the signal conditioning circuit with electrical nodes A, B, C, D & E.
  • the sub-circuit formed by the bounding nodes A, B & C comprise the triac, the two zener diodes and the resistance Rl which will henceforth be referred to as sub-circuit No. 1.
  • Figure la. and lb. show alternative sub-circuits which may b inserted in place of sub-circuit No. 1 in figure 1.
  • the electrical nodes A, B & C are shown whic denote their connections to similarly lettered electrical node in figure 1 when substituted for sub-circuit No. 1.
  • Figure 2 shows the basic connection to an optocoupler device. Electrical nodes D & E denote the connection points to similarly labelled electrical nodes at the signal conditioning device in figure 1.
  • Figure 3 shows the basic connection to a single flashing LED with a built in integrated circuit to cause the device to oscillate between its various states.
  • Electrical nodes D & E denote the connection points to similarly labelled electrical nodes at the signal conditioning device in figure 1.
  • Figure 4 shows the basic connection to a flashing LED which in addition to a built in integrated circuit also contains a second LED within its body.
  • Electrical nodes D & E denote the connection points to similarly labelled electrical nodes at the signal conditioning device in figure 1.
  • Electrical nodes D" & E" denote the connection points to similarly positioned electrical nodes as those shown in the signal conditioning device in figure 1 but in a second signal conditioning device.
  • Figure 5 shows the basic connection to a tricolour LED.
  • Electrical nodes D & E denote the connection points to similarly labelled electrical nodes at the signal conditioning device in figure 1.
  • Electrical nodes D" & E" denote the connection points to similarly positioned electrical nodes as those shown in the signal conditioning device in figure 1 but in a second signal conditioning device.
  • Figure 6 shows the basic connection to an ordinary LED. Electrical nodes D & E denote the connection points to similarly labelled electrical nodes at the signal conditioning device in figure 1.
  • Figure 7 shows the basic connection to an audible alarm unit. Electrical nodes F, G & H denote the connection points t similarly labelled electrical nodes at the opto-couple connection diagram in figure 2.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Led Devices (AREA)

Abstract

A circuit comprising the device which is able to condition and act upon the various forms and types of sinusoidal or quasi-sinusoidal a.c. signals and power sources with electrical pressures of up to 250 Volts applied at its input and is essential as a precursor circuit to enable those aforementioned a.c. signals and power sources combined with circuits for electric-reactively driving LED devices to operate in a practical and useful manner. Figure 1 depicts the basic circuit.

Description

This invention relates to a signal conditioning device fo electric-reactively driving in a practical manner a family o semiconductor devices commonly known as LIGHT EMITTING DIODES (hereinafter referred to as LED's), by means of an alternatin current and voltage, (hereinafter referred to as a.c. or a.c. power sources, or the mains), and operating with electrica pressures of upto 250 Volts.
If electric-reactive fed LED devices are to be driven in practical manner from a.c. sources then it is important t provide a device which is able to condition and act upon the various forms and types of a.c. signals and power sources which may present themselves as inputs with the eventual aim of driving LED devices in an electric-reactive manner.
According to the present invention there is provided a signal conditioning device to operate at a.c. voltages of upto 250 Volts and comprising a triac, two zener diodes, a suppression type 250 V a.c. capacitor, three resistances and a metal oxide varistor suppression device configured and arranged in accordance with figure 1.
The various types of LED devices for which the present invention operates upon are as described as follows:
1. An LED contained within an opto coupler device, which is a semiconductor device which contains an LED and a light sensitive circiut electrically isolated from the LED. The light sensitive circuit reacts accordingly to the active or passive state of the LED.
2. An LED which contains within its body an integrated circuit which is inserted to innovate control of the active or passive state of the LED, commonly known as flashing LED's.
3. An LED which, as above, is a flashing LED but which also incorporates within its body a second independent, LED, usually operating at a different electromagnetic radiation wavelength, (a different colour). The second LED may or may not have common electrical connection points with the first flashing LED. Both LED's may operate concurrently.
4. A tricolour LED comprising of two LED's operating independently and at different wavelengths and contained within the same body and where both LED's may operate
" concurrently. The two LED's may or may not have a common electrical connection point.
5. Ordinary LED's of various brightness.
6. LED's similar in construction to 1 to 5 above but operating at various different wavelengths
According to the present invention the salient points of th various circuits described are as follows:
1. The circuits which surround and interact electrically and optically with the signal conditioning device.
2. The identification of critical connection points or nodes.
3. The orientation and bias of certain key components.
4. Substitute sub-circuits which may be introduced into the existing sub-circuits of the signal conditioning device.
The specific embodiment of the invention will now be described by way of conventional circut-t diagrams where for each circuit a description of its function is given in addition to its inter-connection, direct or indirectly through another circuit, to the signal conditioning device.
Figure 1 shows the signal conditioning circuit with electrical nodes A, B, C, D & E. The sub-circuit formed by the bounding nodes A, B & C comprise the triac, the two zener diodes and the resistance Rl which will henceforth be referred to as sub-circuit No. 1." Figure la. and lb. show alternative sub-circuits which may b inserted in place of sub-circuit No. 1 in figure 1. In bot figures la. and lb. the electrical nodes A, B & C are shown whic denote their connections to similarly lettered electrical node in figure 1 when substituted for sub-circuit No. 1.
Figure 2 shows the basic connection to an optocoupler device. Electrical nodes D & E denote the connection points to similarly labelled electrical nodes at the signal conditioning device in figure 1.
Figure 3 shows the basic connection to a single flashing LED with a built in integrated circuit to cause the device to oscillate between its various states. Electrical nodes D & E denote the connection points to similarly labelled electrical nodes at the signal conditioning device in figure 1.
Figure 4 shows the basic connection to a flashing LED which in addition to a built in integrated circuit also contains a second LED within its body. Electrical nodes D & E denote the connection points to similarly labelled electrical nodes at the signal conditioning device in figure 1. Electrical nodes D" & E" denote the connection points to similarly positioned electrical nodes as those shown in the signal conditioning device in figure 1 but in a second signal conditioning device.
Figure 5 shows the basic connection to a tricolour LED. Electrical nodes D & E denote the connection points to similarly labelled electrical nodes at the signal conditioning device in figure 1. Electrical nodes D" & E" denote the connection points to similarly positioned electrical nodes as those shown in the signal conditioning device in figure 1 but in a second signal conditioning device.
Figure 6 shows the basic connection to an ordinary LED. Electrical nodes D & E denote the connection points to similarly labelled electrical nodes at the signal conditioning device in figure 1. Figure 7 shows the basic connection to an audible alarm unit. Electrical nodes F, G & H denote the connection points t similarly labelled electrical nodes at the opto-couple connection diagram in figure 2.

Claims

1. A signal conditioning device to operate at a.c. voltages o upto 250 Volts and comprising a triac, two zener diodes, suppression type 250 V a.c. capacitor, three resistances an a metal oxide varistor suppression device configured an arranged in accordance with figure 1.
2. A signal conditioning device as claimed in claim 1 wherei the breakdown voltage of the zener diodes depicted in figur
1 may range from 2 Volts to 250 Volts and rated upto 2,50 Watts or the zener diodes may be substituted for othe diodes using the zener principle and such diodes a Epitaxial reference diodes or Silicon planer zener diodes o Encapsulated alloy junction silicon planer reference diode all with similar breakdown voltages and power rating and/or the connection of the zener diodes shown in figure are anode connected to anode and the combination remai connected to one end of the resistance Rl and the gat connection of the triac.
3. A signal conditioning device as claimed in claim 1 or clai
2 wherein the relative positions of the resistance Rl an the two zener diode combination are reversedJ and/or th connections of MTl and MT2, with respect to the triac, ar inversed.
4. A signal conditioning device as claimed in claim 1 or clai 2 or claim 3 wherein the relative positions of th resistance R2 and the capacitor Cl are reversed* and/or th capacitor Cl may be short-circuited or the resistance R may be short-circuited.
5. A signal conditioning device as claimed in claim 1 or clai 2 or claim 3 or claim 4 wherein the relative positions o the resistance R3 the metal oxide varistor are reversed.
6. A signal conditioning device as claimed in claim 1 wherei the circuit described in figure la is substituted for the triac, the two 'zener diode combination and the resistance Rl in the circuit described in figure 1 and the means of th substitution being where the nodes A, B & C described i figure la are connected to the nodes A,B & C described i figure 1 and the breakdown voltage of the zener diode depicted in figure la may range from 2 Volts to 250 Volt and rated upto 2,500 Watts or the zener diodes may b substituted for other diodes using the zener principle an such diodes as Epitaxial reference diodes or Silicon plane zener diodes or Encapsulated alloy junction silicon plane reference diodes all with similar breakdown voltages an power ratings.
7. A signal conditioning device as claimed in claim 6 wherei referring to figure la the zener diode Z3 has its cathod connected to the gate terminal of thyristor TY2 and th zener diode Z4 has. its anode connected to the gate termina of thyristor TYl; and/or a separate resistance is supplied t be connected between node C and zener diode Z3 and separate resistance is supplied to be connected between nod C and zener diode Z4 or if the resistance R5 is left i place then the connection of the two separate resistance being to one side of R5 instead of node C;or a separat resistance is supplied to be connected between the gat terminal of thyristor TY2 and zener diode Z3 and a seperat resistance is supplied to be- connected between the gat terminal of thyristor TYl and zener diode Z4 with or withou the resistance R5 left in place; and/or- the relativ positions of nodes A & B as shown in figure la are reversed
8. A signal conditioning device as claimed in claim 1 wherei the circuit described in figure lb is substituted for th triac, the two zener diode combination and the resistance R in the circuit described in figure 1 and the means -of th substitution being where the nodes A, B & C described i figure lb are connected to the nodes A,B & C described i figure 1 and the breakdown voltage of the zener diode depicted in figure lb may range from 2 Volts to 250 Volt and rated upto 2,500 Watts or the zener diodes may b substituted for other diodes using the zener principle an such diodes as Epitaxial reference diodes or Silicon plane zener diodes or Encapsulated alloy junction silicon plan reference diodes all with similar breakdown voltages a power ratings.
9. A signal conditioning device as claimed in claim 8 where referring to figure lb the relative positions of the zen diode Z5 and the zener diode Z6 are reversed; and/or separate resistance is supplied to be connected between no C and zener diode Z5 and a separate resistance is suppli to be connected between node C and zener diode Z6 or if t resistance R4 is left in place then the connection of t two separate resistances being to one side of R4 instead node C or a separate resistance is supplied to connected between node L and zener diode Z5 and a separa resistance is supplied to be connected between node K a zener diode Z6 with or without the resistance R4 left i place; and/or the relative positions of nodes A & B as sho in figure lb are reversed.
10. A practical a.c. electric-reactive fed LED within an opto coupler device incorporating the signal conditioning devic as claimed in claim 1 or claim 2 or claim 3 or claim 4 o claim 5 or claim 6 or claim 7 or claim 8 or claim 9 wherei referring to figure 2 the nodes D & E are .connected t similarly lettered nodes in figure 1 and where the circui described in figure 2 combine with the circuit described i figure 1 J and/or as modified with any of the claims through to 9 to form a practical a.c. electric-reactive fe LED within an opto-coupler device.
11. A practical a.c. electric-reactive fed LED within an opto coupler device as claimed in claim 10 wherein referring t figure 2 the relative position of C2 and R6 are reverse and/or the relative position of Dl and LED1 are reversed.
12. A practical a.c. electric-reactive fed LED within an opto coupler device as claimed in claim 10 or claim 11 wherei referring to figure 2 capacitor C3 can take any value fro the range of values possible which results, for the C3 & R combination, in a time constant range of between millisecond and 1,000 seconds where R7 can take any valu between 30 ohms and 10 million ohms and to operate withi the voltage range as set by the applied d.c. voltage acros nodes G & H; and/or where a resistance is placed between C3 node F then that resistance can take any value between 3 ohms and 10 million ohms; and/or where a resistance i placed between C3 & node H then that resistance can take an value between 30 ohms and 10 million ohms*and/or where an additional capacitor-resistance network is placed at th emitter terminal of the opto-coupler device then tha combination shall have a time constant range of anythin between 1 millisecond and 1,000 seconds;or referring t figure 2 C3 and R7 are removed and node H is connecte to the emitter terminal of the opto-coupler device and resistance is placed between node G and the collecto terminal of the opto-coupler device and a second resistanc is connected to the collector terminal of the opto-couple device and connected in series to a capacitor the other en of the capacitor being connected to node H and where node is now connected to the collector terminal of the opto coupler device and where the time constant of the capacito and second resistance, (that resistance which is in serie with the capacitor), is anything between 1 pico-second an 1,000 seconds. In the case where an opto-coupler device o the kind which has no defined "collector" and "emitter terminals, such as the GE HllFl, (RS No. 650-790), i employed in the circuit of figure 2 and where the outputs o the said device can be"considered as an analogue switch the the two outputs comprising the analogue switch can b considered in either configuration or manner as th eguivelant emitter and collector terminals in the context o this claim, (ie. either terminal can be the collector whil the remaining terminal becomes the emitter) .
13. A practical a.c. electric-reactive fed flashing LED devic incorporating the signal conditioning device as claimed i claim 1 or claim 2 or claim 3 or claim 4 or claim 5 o claim 6 or claim 7 or claim 8 or claim 9 wherein referrin to figure 3 the nodes D & E are connected to similarl lettered nodes in figure 1 and where the circuit describe in figure 3 combine with the circuit described in figure 1 and/or as modified with any of the claims 2 through to 9 to form a practical a.c. electric-reactive fed flashing LED device. Referring to figure 3 the device connected across the nodes I & J is an LED with a built in integrated circuit which causes the LED to flash on & off at a given frequency.
14. A practical a.c. electric-reactive fed flashing LED device as claimed in claim 13 wherein referring to figure 3 the connections of capacitor C4 are inversed the connections of the zener diode Z7 are inversed and the relative positions of the zener diode Z7 and the resistance R8 are reversed and the connections of both diodes D2 & D3 are inversed; and/or the relative positions the resistance R9 and the capacitor C5 are reversed.
15. A practical a.c. electric-reactive fed flashing LED with a second non flashing LED combined device incorporating the signal conditioning device as claimed in claim 1 or claim 2 or claim 3 or claim 4 or claim 5 or claim 6 or claim 7 or claim 8 or claim 9 wherein referring to figure 4 the nodes D & E are connected to similarly lettered nodes in figure lj and/or as modified with any of the claims 2 through to 9; and where the nodes D" & E" are connected to another, (second), similar signal conditioning device whose circuit is constructed identically to that circuit shown in figure 1; and/or as modified with any of the claims 2 through to 9 to form a practical a.c. electric-reactive fed flashing LED with a second non flashing LED combined device. Referring to figure 4 the device connected across the nodes N & P is an LED with a built in integrated circuit which causes the LED to flash on & off at a given frequency and the device connected across the nodes M & Q is the second non flashing LED built into the body of the first flashing LED.
16. A practical a.c. electric-reactive fed flashing LED with a second non flashing LED combined device as claimed in claim 15 wherein referring to figure 4 the connections of capacitor C12 are inversed the connections of the zener diode Z8 are inversed and the relative positions of the zener diode Z8 and the resistance RIO are reversed and the connections of both diodes D4 & D5 are inversed;and/or the relative positions the resistance Rll and the capacitor C6 are reversed; and/or the connections of D6 and LED 4 are inversed; and/or the relative positions of D6 and LED 4 are reversed;and/or the relative positions of the resistance R16 and capacitor Cll are reversed; and node M is connected to node P.
17. A practical a.c. electric-reactive fed tri colour LED device incorporating a signal conditioning device as claimed in claim 1 or claim 2 or claim 3 or claim 4 or claim 5 or claim 6 or claim 7 or claim 8 or claim 9 wherein referring to figure 5 the nodes D & E are connected to similarly lettered nodes in figure 1; and/or as modified with any of the claims 2 through to 9; and where the nodes D" & E" are connected to another, (second), similar signal conditioning device whose circuit is constructed identically to that circuit shown in figure 1;and/or as modified with any of the claims 2 through to 9; to form a practical a.c. electric-reactive fed tri colour LED device.
18. A practical a.c. electric-reactive fed tri colour LED device as claimed in claim 17 wherein referring to figure 5 the relative positions of the resistance R12 and the capacitor C7 are reversed;and/or the connections of the diode D7 and the LED 5 are inversed;and/or the relative positions of the diode D7 and the LED 5 are reversed;and/or the connections of the diode D8 and the LED 6 are inversed; and/or the relative positions of the diode D8 and the LED 6 are reversed; and/or the relative positions of the capacitor C8 and the resistance R13 are reversed.
19. A a practical a.c. electric-reactive fed LED device incorporating a signal conditioning device as claimed in claim 1 or claim 2 or claim 3 or claim 4 or claim 5 or claim 6 or claim 7 or claim 8 or claim 9 wherein referring to figure 6 the nodes D & E are connected to similarly lettered nodes'in 'figure 1 and where the circuit described in figure 6 combine with the circuit described in figure 1* and/or as modified with any of the claims 2 through to 9 to form a practical a.c. electric-reactive fed LED device.
20. A practical a.c. electric-reactive fed LED device as claimed in claim 19 wherein referring to figure 6 the relative positions of the resistance R15 and the capacitor CIO are reversed;and/or the connections of diode D9 and LED 7 are inversed;and/or the relative positions of diode D9 and LED 7 are reversed.
21. An audible alarm system incorporating a practical a.c. electric-reactive fed LED within an opto-coupler device as claimed in claim 10 or claim 11 or claim 12 wherein referring to figure 7 the nodes G, F & H are connected to similarly lettered nodes in figure 2 to form an audible alarm system
22. An audible alarm system as claimed in claim 21 wherein the case of where the node F in figure 2 having been shifted to the collector terminal of the opto-coupler device as claimed in claim 12 then the inverting buffer integrated circuit, as shown in figure 7 is short-circuited.
23. A signal conditioning device with an incorporated family of circuits for electric-reactive fed LED devices and an incorporated circuit for an audible alarm system and substantially as described herein with reference to figures 1-7 of the accompanying drawings.
NOMENCLATURE
A. In the context of the above claims the term ■-■"The connections of the "Z" are inversed" has the meaning depicted in figure 8 & 8a. Figure 8 shows the original connections of "Z" and figure 8a. shows the connections of "Z" after it has been inversed.
B. In the context of "the above claims the term "The relative positions of "X" and "Y" are reversed" has the meaning depicted in figure 9 & 9a. Figure 9 shows the original positions of "X" and "Y" and figure 9a. shows the positions of "X" and "Y" after reversal.
In the context of the above claims and the rest of this application the term "Electric-reactive" is to be interpreted in the Electrical Engineering or as defined in Physics manner, that is to say as one would discuss "real" power and "reactive" power. The word "electric" as used in the term "electric-reactive" merely serves to emphasise the use of the word "reactive" in the Electrical Engineering or Physics domain and to give the word "reactive" its Electrical Engineering or Physics meaning.
PCT/GB1989/000764 1988-07-08 1989-07-06 Signal conditioning device WO1990000835A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8816367.0 1988-07-08
GB8816367A GB2220533A (en) 1988-07-08 1988-07-08 Signal conditioning device

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Publication Number Publication Date
WO1990000835A1 true WO1990000835A1 (en) 1990-01-25

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EP (1) EP0452321A1 (en)
AU (1) AU3877489A (en)
GB (1) GB2220533A (en)
WO (1) WO1990000835A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2252685A (en) * 1991-02-08 1992-08-12 Richard Dean Ledger Power supply circuit for indicator
GB9103786D0 (en) * 1991-02-22 1991-04-10 Energy Saving Services Energy saving unit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1568068A (en) * 1967-02-06 1969-05-23
US4052624A (en) * 1976-04-07 1977-10-04 General Electric Company Ramp and pedestal control circuit
EP0168840A2 (en) * 1984-07-20 1986-01-22 Om Ahuja Remote actuated switch

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1568068A (en) * 1967-02-06 1969-05-23
US4052624A (en) * 1976-04-07 1977-10-04 General Electric Company Ramp and pedestal control circuit
EP0168840A2 (en) * 1984-07-20 1986-01-22 Om Ahuja Remote actuated switch

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Toute l'Electronique, No. 478, November 1982 (Paris, FR), "Applications Speciales des Photo-Coupleurs", pages 48-56 see page 51, last paragraph - page 53, first paragraph; figure 15 *

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GB2220533A (en) 1990-01-10
EP0452321A1 (en) 1991-10-23
GB8816367D0 (en) 1988-08-10
AU3877489A (en) 1990-02-05

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