CA2515944A1

CA2515944A1 - Process and circuit arrangement for igniting a gas stream

Info

Publication number: CA2515944A1
Application number: CA002515944A
Authority: CA
Inventors: Barbara Happe; Juergen Blank
Original assignee: Individual
Current assignee: Maxitrol GmbH and Co KG
Priority date: 2003-02-13
Filing date: 2004-02-12
Publication date: 2004-08-26
Anticipated expiration: 2024-02-12
Also published as: DK1592923T3; WO2004072555A1; AR043183A1; ES2366088T3; CA2515944C; TWI308204B; KR101050934B1; DE10305928B3; PT1592923E; AU2004211492B2; DE502004012469D1; EP1592923B1; PL207731B1; ATE508329T1; EP1592923A1; SI1592923T1; TW200506285A; CN1748109A; JP2006517646A; PL378019A1

Abstract

The invention relates to a method and a circuit for igniting a gas flow in a fully automatic manner. The aim of the invention is to maintain the necessary current consumption so low that an integratable voltage source can be used. To this end, once an electronic control unit has been activated, a thermoelectric safety pilot valve (2) is opened by an electromagnet which is temporarily excited by a rush of current, is maintained in the open position by a safety pilot magnet (6) by means of a holding current provided by a voltage source (10), and the escaping gas is ignited. Once a thermoelectric couple (4) is provided for the necessary holding current, the voltage source (10) is switched off. In the event of damage, the method is automatically interrupted.

Claims

1. Process for igniting a gas stream, characterised by the fact that by means of an electronic control unit and after activating it to ignite the gas stream a. a transverter is activated, which generates a higher voltage from a direct current supplied from an electricity source (10), b. a storage capacitor (C1) and an ignition capacitor (C2), serving to provide the ignition voltage (C2) by means of the higher voltage, are charged.
c. an essentially familiar ignition locking magnet (6) activated by a holding current provided by the electricity source (10), while at the same time an electric circuit that exists between the ignition locking magnet (6) and a thermocouple (4) that can be influenced by the gas flame is interrupted via a relay (17).
d. the storage capacitor (C1) is abruptly discharged via a circuit element, generating a surge of current, which briefly energises an electromagnet (5), to open an essentially familiar ignition locking valve (2) and at the same time attach anchor (3) of the ignition locking magnet (6), while the anchor (3) is held in this position after attachment because of the ignition locking magnet (6) activated by the holding current, e. a pilot light is generated in a familiar fashion to ignite the outflowing gas via an ignition electrode (9) connected with the ignition capacitor (C2) via an ignition transformer, f. further ignition procedures are initiated, whereby .cndot. the ignition capacitor (C2) is re-charged, .angle. after charging a new pilot light is generated, g. after a prescribed period of time ignition is terminated.
h. the holding current flowing from the electricity source (10) to the ignition locking magnet (6) is interrupted and the circuit between the ignition locking magnet (6) and the thermocouple is closed via the relay (17).

2. Processes to ignite a gas stream in accordance with patent claim 1, characterised by the fact that after being activated to ignite the gas stream the electronic control unit carries out a check to determine whether a gas flame is alight, aborting the ignition procedure if the information is positive.

3. Processes to ignite a gas stream in accordance with one of the patent claims 1 or 2, characterised by the fact that a. the existence of thermal electromagnetic force is measured and further ignition procedures are initiated if it is lacking, insofar as .cndot. the ignition capacitor (C2) is re-charged, .cndot. after charging a new pilot light is generated, whereas if there is a thermal electromagnetic force ignition is terminated, b. the holding current flowing from the electricity source (10) to the ignition locking magnet (6) is interrupted and the circuit between the ignition locking magnet (6) and the thermocouple is closed via the relay (17) as soon as the thermoelectric current calculated from the existing thermal electromagnetic force is sufficient to hold the anchor (3) on the ignition locking magnet (6).

4. Processes to ignite a gas stream in accordance with one of the patent claims 1 to 3, characterised by the fact that the storage capacitor (C1) and the ignition capacitor (C2) are charged via transverters assigned to each of them respectively.

5. Processes to ignite a gas stream in accordance with one of the patent claims 1 to 3, characterised by the tact that - from the direct current supplied from the electricity source (10) a higher voltage is generated, using a power oscillator (11) instead of the transverter, the storage capacitor (C1) is switched to the first stage (12) of a multiple cascade downstream of the power oscillator (11) and charged up to a prescribed higher DC voltage, the ignition capacitor (C2), which is connected by electrical conduction with the second stage (13) of the multiple cascade, is charged up to a prescribed higher DC voltage.

6. Processes to ignite a gas stream in accordance with patent claim 5, characterised by the fact that after reaching the prescribed higher DC
voltages the power oscillator (11) is switched off and then switched on again when further ignition procedures are initiated.

7. Processes to ignite a gas stream in accordance with one of the patent claims 1 to 6, characterised by the fact that the holding current supplied from electricity source (10) to hold the anchor (3) simultaneously flows through the ignition locking magnet (6) and the relay (17), and that at the time that the electric circuit between ignition locking magnet (6) and thermocouple (4) is closed by closing the relay (17) an additional current is briefly generated.

8. Processes to ignite a gas stream in accordance with one of the patent claims 1 to 6, characterised by the fact that the voltage of the holding current supplied to the ignition locking magnet (6) from electricity source (10) is transverted into the millivolt range.

9. Processes to ignite a gas stream in accordance with one or more of the patent claims 1 to 8, characterised by the fact that the existence of a thermal electromagnetic force is measured by an analogue amplifier (20).

10. Processes to ignite a gas stream in accordance with one or more of the patent claims 1 to 9, characterised by the fact that for safety purposes after a defined period of time has elapsed the energisation of the ignition locking magnet (6) via the electricity source (10) is inevitably interrupted by one or more safety cutoffs (18) connected in series and timed.

11. Processes to ignite a gas stream in accordance with patent claim 5 or 6, characterised by the fact that at the first ignition procedure following ignition procedures prior to charging the ignition capacitor (C2) the storage capacitor (C1) is disconnected from the cascade (12).

12. Circuit arrangement for carrying out the procedure for igniting a gas stream with - a transverter connected to an electricity source (10), - a storage capacitor (C1) (downstream from the transverter), which is connected to an electromagnet (5) to operate an essentially familiar ignition locking valve (2), and an ignition capacitor (C2), which is linked in a familiar fashion to a ignition electrode (9) via an ignition transformer, - an essentially familiar ignition locking magnet (6), which is connected via a relay (17) either to the electricity source (10) or a thermocouple (4), - at least one timed safety cutoff (18) located between the electricity source (10) and the ignition locking magnet (6), - an element for measuring the voltage of the thermocouple (4), whereby the elements to be triggered are connected to an electronic control unit via ports assigned top them.

13. Circuit arrangement for the electronic ignition of a gas stream in accordance with patent claim 12, characterised by the fact that the storage capacitor (C1) has an element assigned to it (14) to monitor and limit voltage and an transverter assigned to it also.

14. Circuit arrangement for the electronic ignition of a gas stream in accordance with patent claim 12, characterised by the fact that the ignition capacitor (C2) has an element assigned to it (14) to monitor and limit voltage and an transverter assigned to it also.

15. Circuit arrangement for the electronic ignition of a gas stream in accordance with patent claim 13 and/or 14, characterised by the fact that - instead of the transverter a power oscillator (11) is connected to the electricity source (10), - a cascade (12/13) is downstream from the power oscillator (11), - the element (14) is located after the cascade (12/13) for monitoring and limiting voltage.

16. Circuit arrangement for the electronic ignition of a gas stream in accordance with patent claim 13, characterised by the fact that the power oscillator (11) is developed from a CMOS circuit (15), which has at least four gates, which are either developed as NOR gates or NAND gates or simple negators, and of which at least one gate is upstream from the other parallel-connected gates, or of several CMOS circuits, a complementary field effect power stage (16) downstream from the gates, an LC resonant circuit (L1/C3) also downstream from these, and a link serving as a phase shifter (19).

17. Circuit arrangement for the electronic ignition of a gas stream in accordance with one or more of the patent claims 12-16, characterised by the fact that the element for measuring the voltage of the thermocouple (4) is an analogue amplifier (20).

18. Circuit arrangement for the electronic ignition of a gas stream in accordance with patent claim 17, characterised by the fact that the analogue amplifier (20) is an AC amplifier, downstream from a clocked voltage divider.