CN219534405U

CN219534405U - Acceleration starting circuit under short wave motor electron tube filament state

Info

Publication number: CN219534405U
Application number: CN202320430670.1U
Authority: CN
Inventors: 李翔
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-03-09
Filing date: 2023-03-09
Publication date: 2023-08-15
Anticipated expiration: 2033-03-09

Abstract

The utility model discloses an acceleration starting circuit of a short-wave motor electronic tube IN a filament state, wherein the positive electrode of a direct-current power supply is connected with the positive electrode DC+ end of a single-way delay relay and the positive electrode IN+ end of a trigger signal, 24V power is provided for the single-way delay relay, the negative electrode of the direct-current power supply is connected with a switch S1, the other end of the switch S1 is connected with the negative electrode DC-end of the single-way delay relay and the negative electrode IN-end of the trigger signal, the trigger signal is provided for the single-way delay relay when the switch S1 is closed, the COM end of the single-way delay relay is connected with a normally open contact KT101:67 of the energizing delay relay, the NO end of the normally open contact KT101:68 of the energizing delay relay is connected with a filament preheating completion relay K9, and the filament preheating completion relay K9 is grounded. The problem that the transmitter is stopped for a long time due to external electric flashover or interruption in normal broadcasting of the transmitter is solved.

Description

Acceleration starting circuit under short wave motor electron tube filament state

Technical Field

The utility model relates to the technical field of transmitters, in particular to an acceleration starting circuit under the state of a short-wave motor tube filament.

Background

At present, a large-power short-wave transmitter uses a large-sized electron tube, the filament current of the large-sized electron tube can reach hundreds of amperes, and meanwhile, the cold state (room temperature) and the hot state (working time) of the filament resistance are greatly different, so that the filament voltage of the electron tube must be uniformly and slowly boosted to a rated value from the beginning in order to protect the service life of the large-power electron tube. After the filament of the high-power shortwave transmitter electron tube is powered on, the electron tube can be biased, curtain grid voltage and screen voltage after the filament is preheated for 6 minutes, and the transmitter can work normally.

However, in the normal broadcasting process of the short wave transmitter, the filament is dropped from the transmitter electron tube due to the external electric flashover or interruption, and the long-time broadcasting stop is caused due to the overlong preheating time of the filament of the transmitter, so that the long-time broadcasting stop of the transmitter is absolutely not allowed in the broadcasting process of the broadcasting station.

Therefore, how to provide an accelerating starting circuit under the filament state of a short-wave electron tube is a problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the utility model provides an acceleration starting circuit of a short wave transmitter electronic tube filament, which solves the problem that the transmitter is stopped for a long time due to the fact that the transmitter electronic tube filament is electrically flashed or interrupted in the broadcasting process of the transmitter.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

an acceleration start circuit in a short wave electron tube filament state, comprising: the positive pole of the direct current power supply is connected with the positive pole DC+ end of the single-way delay relay and the positive pole IN+ end of the trigger signal, the negative pole of the direct current power supply is connected with the switch S1, the other end of the switch S1 is connected with the negative pole DC-end of the single-way delay relay and the negative pole IN-end of the trigger signal, when the switch S1 is closed, the trigger signal is provided for the single-way delay relay, the single-way delay relay COM is connected with the normally open contact KT101:67 of the energizing delay relay, the normally open contact NO of the single-way delay relay is connected with the normally open contact KT101:68 of the energizing delay relay, the normally open contact KT101:68 of the energizing delay relay is connected with the filament preheating completion relay K9, and the filament preheating completion relay K9 is grounded.

Preferably, the direct current power supply is 24V.

Preferably, the delay time of the one-way delay relay is 40 seconds.

Preferably, the switch S1 of the accelerating start circuit is opened in the state of the lamp filament after broadcasting

Compared with the prior art, the utility model discloses an accelerating starting circuit under the state of the filament of the short wave transmitter electronic tube, reduces the preheating delay time of the filament time relay of the short wave transmitter electronic tube, and solves the problem that the external electric flashover or interruption causes long-time outage of the transmitter in the broadcasting process of the transmitter.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an accelerating start circuit in a filament state of a short-wave motor tube according to the present utility model.

Fig. 2 is a circuit diagram of a lamp filament when the accelerating startup circuit provided by the utility model is applied to a short wave transmitter.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 2, during normal broadcasting operation of the transmitter, the filament of the transmitter is lost due to an external electric flashover or interruption, and the transmitter cannot operate normally. The operator rapidly closes the transmitter filament power-on switch S2, three alternating current inputs L1 and three alternating current inputs L4 are connected with three alternating currents 50Hz380VL1, three alternating current inputs L2 are connected with three alternating currents 50Hz380VL2, and three alternating current inputs L3 are connected with three alternating currents 50Hz380VL3. Three alternating current inputs L1, L2 and L3 are connected to a main contact of a first-gear alternating current contactor KM102 of a transmitter filament, three alternating current inputs L1, L2 and L3 are connected to a main contact of a second-gear alternating current contactor KM101 of the transmitter filament, wherein three alternating current inputs L4 are respectively connected to a control coil A1 end of the alternating current contactor KM102 and an electrifying delay relay KT102:2. The control coil A2 end of the alternating-current contactor KM102, the control coil A2 end of the alternating-current contactor KM101, the energizing delay relay KT102:7 and the energizing delay relay KT101:7 are connected with a zero line N. The alternating-current contactor KM102 and the electrifying delay relay KT102 work, a filament is electrified for one section, three alternating-current inputs L1, L2 and L3 are added to the primary of the final-stage filament transformer of the transmitter after being divided by resistors R1, R2 and R3, and the primary of the final-stage filament transformer of the transmitter is pushed. The setting time of the energizing delay relay KT102 is 20 seconds, which is the energizing time of a section of the transmitter filament, after 20 seconds, a section of the normally open contact KT102:67 of the energizing delay relay KT102 is closed, and the energizing of a section of the filament is completed. The second section of the filament starts to be powered on, three alternating current inputs L4 are respectively connected with a control coil A1 of an alternating current contactor KM101 and a second section of the tube filament power-on delay relay KT101:2, the alternating current contactor KM101 and the power-on delay relay KT101 work, and the three alternating current inputs L1, L2 and L3 span resistors R1, R2 and R3 and are directly added to the primary of a final-stage filament transformer of the transmitter to push the primary of the filament transformer of the stage. The power-on delay relay KT101 starts timing, the lamp filament preheating completion relay K9:2 is connected with direct current +24V, the lamp filament preheating completion relay K9:7 is grounded, after 6 minutes, the normally open contact KT101:67 of the power-on delay relay KT101, the normally open contact KT101:68 of the power-on delay relay KT101 are closed, the lamp filament preheating completion relay K9 works, the normally open contact K9:5 of the lamp filament preheating completion relay K9, the K9:6 is closed, one +24V is output, a transmitter monitoring system judges whether the lamp filament preheating of the transmitter is completed according to the presence or absence of 24V, the fact that the lamp filament preheating of the transmitter is completed is indicated by the presence or absence of 24V, and the transmitter works normally. At this point the transmitter is broadcasting and the 6 minute off-air time is absolutely intolerable. During normal broadcasting operation of the transmitter, the filament of the transmitter is broken due to external electric flashover or interruption, at the moment, the cathode of the filament of the electron tube is still in a thermal state, and after the transmitter is powered off and powered on again, the cathode of the electron tube does not need to be preheated.

The embodiment of the utility model discloses an acceleration starting circuit under the state of a short wave transmitter electronic tube filament, which is shown IN figure 1, wherein the anode of a 24V direct current power supply is connected with the anode DC+ end of a single-way delay relay and the anode IN+ end of a trigger signal, 24V power supply is provided for the single-way delay relay, the cathode of the transmitter 24V direct current power supply is connected with a switch S1, the other end of the switch S1 is connected with the cathode DC-end of the single-way delay relay and the cathode IN-end of the trigger signal, and the trigger signal is provided for the single-way delay relay when the switch S1 is closed. The output end COM end of the one-way delay relay is a public end, the NO end is a normally open contact, and the NC end is a normally closed contact. The 24V direct current is connected with normally open contacts KT101:67 of the electric delay relay, the COM end of the single-way delay relay is connected with normally open contacts KT101:67 of the electric delay relay at the same time, the normally open contacts NO of the single-way delay relay are connected with normally open contacts KT101:68 of the electric delay relay, the normally open contacts KT101:68 of the electric delay relay are connected with a relay K9:2 after filament preheating is completed, and the relay K9:7 is grounded. When the acceleration starting circuit switch S1 is closed in the state of the lamp filament of the electron tube and a trigger signal is provided for the single-way delay relay, the normally open contact NO end of the single-way delay relay is attracted after 40 seconds, the transmitter filament preheating relay K9 works, the normally open contact K9 of the filament preheating completion relay K9 is 5:6, the K9:6 is closed, one +24V is output, and the transmitter monitoring system judges that the preheating of the transmitter filament is completed according to 24V. At this time, the transmitter is biased, the curtain voltage is applied, and the screen voltage is applied, so that the transmitter can work normally. After broadcasting is finished, the accelerating starting circuit switch S1 is turned on under the state of the lamp filament. According to the utility model, the problem of long-time off-broadcasting of the transmitter is solved through the normally open interfaces KT101:67 and KT101:68 of the single-way delay relay short-circuit filament two-section power-on delay relay KT 101.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An accelerating start circuit in a short wave electron tube filament state, comprising: the positive pole of the direct current power supply is connected with the positive pole DC+ end of the single-way delay relay and the positive pole IN+ end of the trigger signal, the negative pole of the direct current power supply is connected with the switch S1, the other end of the switch S1 is connected with the negative pole DC-end of the single-way delay relay and the negative pole IN-end of the trigger signal, when the switch S1 is closed, the trigger signal is provided for the single-way delay relay, the single-way delay relay COM is connected with the normally open contact KT101:67 of the energizing delay relay, the normally open contact NO of the single-way delay relay is connected with the normally open contact KT101:68 of the energizing delay relay, the normally open contact KT101:68 of the energizing delay relay is connected with the filament preheating completion relay K9, and the filament preheating completion relay K9 is grounded.

2. The short-wave electron tube filament state acceleration start circuit of claim 1, wherein the direct current power supply is 24V.

3. The short-wave motor tube filament state acceleration start circuit of claim 1, wherein the delay time of the single-path delay relay is 40 seconds.

4. The accelerating start circuit in a filament state of a short wave transmitter electronic tube according to claim 1, wherein the switch S1 is turned on after the broadcasting is finished.