CN1061877A - Transmitter " uninterruptedly " broadcasting (work) digital-control circuit - Google Patents

Transmitter " uninterruptedly " broadcasting (work) digital-control circuit Download PDF

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CN1061877A
CN1061877A CN 91108227 CN91108227A CN1061877A CN 1061877 A CN1061877 A CN 1061877A CN 91108227 CN91108227 CN 91108227 CN 91108227 A CN91108227 A CN 91108227A CN 1061877 A CN1061877 A CN 1061877A
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input
circuit
uninterruptedly
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level
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CN1022365C (en
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钱柏良
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Abstract

The invention discloses a kind of transmitter " uninterruptedly " broadcasting (work) digital-control circuit, belong to automatic electric-level control and protective circuit in broadcasting, TV, communication, radar and the similar transmitter.This circuit is mainly compared by input, and nominal level forms, and addition is amplified, and " uninterruptedly " program formation, diverter switch and failure alarm circuit are formed.When (N-1) of transmitter individual radio-frequency power composite circuit successively or several interrupt rf power signal when output simultaneously, the present invention makes transmitted power level suitably reduce one by one automatically with extremely low cost and keeps new level steady; Guarantee not fault branch trouble free service; The newspaper of reporting to the police simultaneously shows maintenance and adheres to " uninterruptedly " broadcasting (work).

Description

Transmitter " uninterruptedly " broadcasting (work) digital-control circuit
The invention discloses transmitter and broadcast (work) digital-control circuit with " uninterruptedly ".It belongs to automatic electric-level control and protective circuit in broadcasting, TV, communication, radar and the similar transmitter thereof.
Present high power solid state frequency-modulated broadcast transmitter and similar transmitters thereof are because the radio frequency output function of radio frequency semiconductor high power device can not satisfy the instructions for use of current high power transmitter, so adopt the multi-channel rf power synthetic technique to satisfy the requirement of RF high power output usually.
General transmitter is steady for keeping forward radio frequency power output level, and often adopting the application number that is disclosed on common monocycle automatic level control circuit or July 4 nineteen ninety on the Chinese patent communique is 89105437.5 " double ring automatic power level control circuit for transmitter ".Adopt the solid-state high power amplifier of N road power complex RF (calling " high power amplifier " in the following text) block diagram of double ring automatic power level control circuit S to see accompanying drawing 1 at present.S has comprised two forward power coupler GO 2, transmit the transmission line l of the direct current automatic electric-level control signal of first and second loop 1, l 2, dual-loop control circuit SK and variable gain radio frequency amplifier (or variable radio frequency attenuator that can be automatically controlled) Gn+1 that can be automatically controlled form.Low level radiofrequency signal Vln imports Gn+1, and the low level output radiofrequency signal after it is controlled is divided into the N road by N way RF power distributor F after RF excited power amplifier Gn+2 is amplified to enough power levels, and they are respectively through the synthetic branch road radio-frequency (RF) power amplification G of N road power 1, G 2, G nBe amplified into N way RF power combiner He, the high power RF signal after it is synthesized is through filter Lo filtering, again through GO 2Arrive antenna TX and broadcast, broadcast power P o.
The operation principle of S is to work as GO 2S automatically made the forward level of RF signals of Gn+1 output reduce when middle forward transmitted radio-frequency power Po increased; And S automatically makes the level of RF signals of Gn+1 output increase when Po reduces, thereby Po is increased.So because the effect of automatic electric-level control, Po is tending towards held stationary.Two automatic electric-level control loops are arranged: the second control loop automatic disconnection when the first control loop operate as normal in S; And as the first control loop l 1Second control loop was connected automatically when the direct-current control voltage of transmission interrupted (by short circuit or open circuit),
Adopting the major defect of the high power amplifier existence of N road power complex RF of monocycle or double ring automatic power level control circuit at present in the transmitter is when certain synthetic branch road power amplifier, n road for example takes place to cause direct current supply voltage interruption, extremely expensive radio frequency semiconductor high power valve or the components and parts of other circuit to damage, input or output line lG such as DC power supply blown fuse etc. 1, lG 2, 1Gn and lG ' 1, lG ' 2, lG ' nShort circuit or when opening circuit etc., power synthetic branch road in n road interrupts rf power signal output, so Po reduces.Right because automatic electric-level control action is tending towards making the Po level steadily on original power level again, the forward power output P that power synthetic branch road power amplifier in former cause N road is undertaken jointly 0Must must increase by the output radio frequency power level of the synthetic branch road power amplifier of (N-1) individual power now; The radio frequency that adds this moment F and each branch road power amplifier inputs or outputs impedance mismatching and voltage standing wave ratio reason such as may degenerate, and the output radio frequency power level of the synthetic branch road power amplifier of (N-1) individual power of fault does not more become to increasing.So interrupting radio frequency power output because of various reasons, certain synthetic branch road power amplifier makes P 0The radio frequency of the remaining synthetic branch road power amplifier of not fault is partly led the working direct current of stopping high power device when reducing must increase.In adopting the synthetic high power amplifier of multichannel power, a synthetic way of interrupting radio frequency output is many more, and it is bigger that the working direct current recruitment of the RF high power device of the synthetic branch road power amplifier of remaining not fault also becomes thereupon.The high power amplifier of homophase power composite solid state of N=2 in the frequency-modulated broadcast transmitter is exported if certain synthetic branch road power amplifier interrupts radio frequency, because of the automatic electric-level control action is tending towards making P in this way 0Steadily, so remaining unique that intact road synthetic branch road power amplifier output radio frequency power level is tending towards doubling at least, obviously its working direct current surge that causes radio-frequency power device this moment because of blasting may cause the radio frequency semiconductor high power device of the synthetic branch road power amplifier in this expensive road impaired in addition burn in, also may cause among the He uneven radio-frequency power absorption resistance because of cross thermal resistance value change very cause burn fully may.The extremely expensive high power amplifier of whole power complex RF of final technology at present may be badly damaged very to cause and wrack and complete machine takes place break.
The way that may solve present technological deficiency usually is to adopt more the radio frequency of high power capacity partly to lead high power valve, and this just causes the synthetic high power amplifier of this power expensive more; Increase synthetic way N of power as much as possible, but this is huge with equipment, cost increases to cost greatly; When several (comprising some), synthetic branch road power amplifier interrupted rf power signal output; manage to introduce one with the similar and opposite automatic control voltage of high standing wave automatic protection functions with the automatic electric-level control action; force this moment forward power output Po to reduce, the working direct current of the semiconductor high power valve of remaining intact synthetic branch road power amplifier thereby be positioned at safety value.May cause low frequency modulations phenomenon because of forward and reverse automatic electric-level control action exists simultaneously right this moment, and the complete machine performance index reduce, for example may a kind of squeak of uppick when FM broadcasting; When several (comprising some), synthetic branch road power amplifier interrupted rf power signal output; because the working direct current of the remaining intact branch road power amplifier of the existence of automatic electric-level control action must increase, adopt the guard method meeting of overcurrent fusing fuse or semi-closure power supply to interrupt broadcasting (work).……
Main purpose of the present invention is for adopting the solid-state frequency-modulated broadcast transmitter of high power and other broadcasting of composition Technology of Frequency Power, TV, communication, radar and similar transmitters provide single portion transmitter (calling " unit " in the following text) to realize the digital-control circuit that " uninterruptedly " broadcasting (work) function is used, thereby with utmost point low cost exempted unit because of certain (several or one by one several, N-1 at most) existence that is tending towards forward power output homeostatic process because of the control of complete machine automatic electric-level when the synthetic branch road of power interrupts rf power signal output causes radio frequency semiconductor high power device blasting expensive in the intact synthetic branch road power amplifier of residue and the uneven radio-frequency power absorption resistance in the high power combiner is overheated or disconnected mutually overheated impaired even burn, vicious circle and the possibility that finally causes the synthetic high power amplifier of extremely expensive power to be badly damaged even thoroughly to burn and interrupt simultaneously broadcasting (work).
Another object of the present invention is a basic principle of the present invention with two bad or the monocycle automatic level control function is compatible mutually: when certain (several or one by one several, N-1 at most) when the synthetic branch road of power interrupts radio-frequency power output the present invention make transmitting power with the certain magnitude in every rank (for example approximate 50% automatically with digital control scheme, therefore possible transmitting power is Po, approximate Po/2, approximate Po/4 ..., but also variable.) reduce or reduce one by one; the working direct current of guaranteeing or guarantee one by one to remain the radio frequency semiconductor high power device of the synthetic branch road of the power that does not interrupt the radio frequency output signal has remained automatic level control function when being positioned at the place of safety automatically; thereby keep or keep successively steady by the new transmitted power level that suitably reduces automatically; under the standard that continues original all the other performance index of maintenance complete machine, adhere to " uninterruptedly " broadcasting (work) (when transmitting power reduced by half approximately, operating distance shrank 30% approximately).
Another purpose of the present invention is that " uninterruptedly " broadcasting (work) digital-control circuit that provides by basic principle of the present invention is compatible mutually with the high standing wave automatic protection circuit of multichannel.
Last purpose of the present invention be when certain (several or one by one several, at most [N-1) individual] when the synthetic branch road of power interrupts radio-frequency power output, the digital-control circuit of making of the principle of the invention will overhaul and " uninterruptedly " broadcasting (work) with mode alarms such as sound, light, number or gauge outfit indications, till the synthetic branch road of N power all interrupts rf power signal output.
Described transmitter " uninterruptedly " broadcasting (work) digital-control circuit mainly by input comparison, nominal level forms, " uninterruptedly " program forms, diverter switch and failure alarm circuit are formed, and finish unit " uninterruptedly " with double ring automatic power level control circuit (accompanying drawing 2) or common monocycle automatic level control circuit (accompanying drawing 3) and broadcast the automatic electric-level of (work) and control and defencive function.
For better illustrating basic principle of the present invention, unit " uninterruptedly " frequency-modulated broadcast transmitter of getting the high effect of three road homophase radio-frequency power composite solid states is for for example to describe in detail.For adopting two the road or be identical more than its basic principle of unit " uninterruptedly " frequency-modulated broadcast transmitter of the high power amplifier of three way RF power composite solid states.Basic functional principle of the present invention is applicable to other broadcasting, TV, communication, radar and similar emitter too.
The present invention will be described in more detail below in conjunction with accompanying drawing.
Accompanying drawing 1 is the common N road power complex RF solid high power discharge block diagram that present technology adopts double ring automatic power level control circuit;
Accompanying drawing 2 is electric theory diagrams of finishing unit " uninterruptedly " broadcasting (work) digital-control circuit with double ring automatic power level control circuit;
Accompanying drawing 3 is electric theory diagrams of finishing unit " uninterruptedly " broadcasting (work) digital-control circuit with the monocycle automatic level control circuit;
Accompanying drawing 4 is electric principle sketches of one of specific embodiments of three way RF power composite solid states high power amplifier FM broadcasting units " uninterruptedly " broadcast numerical control circuit.
Accompanying drawing 5 is electric principle sketches of the simple and easy practical digital-control circuit of the high power amplifier units of four way RF power composite solid states " uninterruptedly " broadcasting usefulness.
Explain the present invention with reference to accompanying drawing 4.
The input comparison circuit comprises: three in-phase voltage comparators.V DC1～V DC3Be respectively and the synthetic relevant direct-current control voltage of branch road power amplifier forward output power levels of three way RF powers, they are transfused to the input of three road in-phase voltage comparators respectively and draw end.Capacitor C 101, resistance R 101～R 102, R 107～ 108And voltage comparison amplifier M 1Constitute first via in-phase voltage comparator; Capacitor C 102, resistance R 103～R 104, R 107～R 108And voltage comparison amplifier M 2Constitute the second road in-phase voltage comparator; Capacitor C 103, resistance R 105～R 106, R 107～R 108And voltage comparison amplifier M 3Constitute Third Road in-phase voltage comparator.C 101, R 101, R 102The public end that draws link V DC1Input draw end, C 101And R 101Other end ground connection all, R 102The other end connect M 1In-phase input end; C 102, R 103, R 104The public end that draws connect V DC2Input draw end, C 102And R 103Other end ground connection all, R 104The other end connect M 2In-phase input end; Form comparison reference voltage V R1The potential-divider network resistance R 107, R 108The public end that draws link M simultaneously 1～M 3Inverting input, R 107The lead-in wire of another termination supply voltage+Vcc, R 108Other end ground connection.M 1Output port link the resistance R that subordinate's first nominal level forms circuit 109Input draw end; M 2Output second nominal level that links subordinate form the resistance R of circuit 112Input draw end; M 3Output the 3rd nominal level that links subordinate form the resistance R of circuit 115Input draw end.
Nominal level forms circuit and comprises: divider resistance R 109, R 110First nominal level that constitutes forms circuit; Divider resistance R 112, R 113Second nominal level that constitutes forms circuit; Divider resistance R 115, R 116The 3rd nominal level that constitutes forms circuit.R 109, R 110publicly draw the input resistance R that end links subordinate's addition amplifier 111Input draw end.R 112, R 113publicly draw the input resistance R that end links subordinate's addition amplifier 114Input draw end.R 115, R 116publicly draw the input resistance R that end links subordinate's addition amplifier 117Input draw end.
The addition amplifying circuit comprises: input resistance R 111, R 114, R 117, the resistance R of major decision addition amplification quantity 118, R 119With amplifier M 4R 111, R 114, R 117The public end that draws link M 4The in-phase input end mouth, R 118And R 119Public drawing of connecting of mutual knot terminate to M 4Anti-phase input draw end, R 119The other end and M 4Output draw the end be connected M 4Output port and subordinate's " end " program two input resistance R forming circuit 123, R 124The public end company of knot mutually of drawing of input.
" uninterruptedly " program forms circuit and comprises: two buffering input resistance R 123, R 124, amplifier M 5And M 6And formation comparison reference voltage V R2, V R3Three resistance R of resistance pressure-dividing network 120～R 122R 123Output draw end and be attached to M 5In-phase input end, R 124Output draw end and be attached to M 6Inverting input, R 120, R 121The public end that draws link M 5Inverting input, R 121, R 122With the fault alarm amplifier M of subordinate 7Homophase input resistance R 126The public end that draws link M 6In-phase input end.M 5Output port link the diverter switch SW of subordinate 3Control input draw end 203 and warning circuit M 7Anti-phase input resistance R 125Input draw end; M 6Output port link thereafter another diverter switch SW 4Control input draw end 206.
Switching switch circuit comprises: but electric-controlled switch SW 3And SW 4Drawing end 203,206 is respectively SW 3, SW 4Automatically controlled input draw end; SW 3Signal input, output port be respectively 201 and 202; SW 4Signal input, output port be respectively 204,205; Draw the first automatic electric-level control loop direct-current control voltage Vl that end 201 links SK 1Input lead l 1; Draw end 202 and receive the input CONTROLLED POTENTIAL device W of the first automatic electric-level control loop of SK 1Input draw end, W 1The center draw the buffer amplifier A that end is still linked former SK 4In-phase input end.SW 4Signal input draw the second automatic electric-level control loop direct-current control voltage Vl that end 204 is linked SK 2Input lead l 2, output is drawn end 205 and is linked second automatic electric-level control loop input CONTROLLED POTENTIAL device W 2The center draw the end with amplifier A 5The public end that draws of in-phase input end mouth.
Failure alarm circuit comprises: input resistance R 125～R 126, amplifier M 7, the output current limiting resistance R 127, LED.R 125An end link M 5Output port, other end limit is to M 7The inverting input mouth; R 126An end link R 121, R 122Public drawing on the end, the other end links M 7The in-phase input end mouth; R 127Be serially connected with M 7Output port and the anode of LED between, the minus earth of LED.
Below in conjunction with the accompanying drawing 4 electric principle of system specifics work of the present invention more.Make high level that (approaching+as Vcc) to represent with symbol H, low-voltage (OV) is represented with symbol L.
1, three synthetic branch roads of radio-frequency power all do not interrupt rf power signal output.
V DC1～V DC3All greater than the first comparison reference voltage V R1, M 1～M 3Output voltage V 1～V 3Be the H level, first to the 3rd nominal level circuit output nominal level V 10～V 30Be the high value of suitable nominal.If M 4Output voltage be V 4, by R 120～R 122Second and third comparison reference voltage of determining is respectively V R2And V R3Then as long as the correct resistance R of selecting major decision to strengthen the circuit amplification quantity mutually 118, R 119Just can obtain V 4＞V R2＞V R3So, M 5Be output as the H level, SW 3Connect; M 6Output V 6Be L level, SW 4Disconnect.So first loop of SK is connected, its inner automatic disconnection second loop.As long as W 1Regulate properly, transmitter will be broadcast with full power Po level equalization.Owing to V this moment 5＞V R3So, M 7Output voltage V 7Be the L level, LED extinguishes state (LED that also can increase green light or other coloured light is working properly to show).
2, there is any one to interrupt rf power signal output in three synthetic branch roads of radio-frequency power.
V DC1～V DC3In should have one mutually less than V R1, V 1～V 3In should have one mutually for the L level, V 10～V 30In should have one mutually for OV.Circuit design gets V this moment R2＞V 4＞V R3So, V 5Be L level, SW 3Disconnect; V 6Also be the L level, SW 4Also disconnect.So first loop of SK is cut off, this moment, its inside possessed the function of automatic connection first loop.Adjust W 2The power output that broadcast this moment suitably reduces, and for example near Po/2, adjusting principle is to make the working direct current of the radio frequency semiconductor high power valve of the synthetic branch road of power that does not interrupt radio-frequency power output this moment be positioned at safety value.Though because the existence of the second automatic electric-level control action of SK is stable so this of approximate Po/2 broadcast power level equally, other performance specification of complete machine should be able to be satisfied equally during this fail operation state.Therefore V time the again 5＜V R3So, V 7Be the H level, the luminous warning of LED, bright degree is by R 127Adjust.
3, three synthetic branch roads of radio-frequency power have any two to interrupt rf power signal output successively or simultaneously.
V DC1～V DC3In should be arranged less than V two whiles mutually R1So V 1～V 3In have corresponding two for the L level; V 10～V 30In also should have one mutually for the L level, have only one to be the nominal high level.Should make V this moment when circuit design was suitable R2＞V R3＞V 4So, V 5Be L level, V 6Be the H level.SW correspondingly 3Disconnect SW 4Connect.First loop of SK is cut off, and its inside makes second loop connect automatically.Be short-circuit condition because of drawing end 204 and 205 right this moment, i.e. resistance R SKInput draw the end and W 3Center output draw end by short circuit, the automatic electric-level control voltage of second loop increases.Because the intrinsic reverse control action of automatic level control circuit, so complete machine is broadcast new power level (the adjustment R that power will be forced to drop to from the level of approximate Po/2 automatically approximate Po/4 SK, W 1Relation obtains) on, adjust principle this moment and should make the working direct current of the radio frequency semiconductor high power valve of the synthetic branch road of power that does not interrupt radio-frequency power output be positioned at safety value equally.At the second automatic electric-level control loop of the SK of this fail operation state still in action, be stably too so this of approximate Po/4 broadcast power level, the main performance standard keeps too.Obviously LED is at this moment luminous warning too.
4, three synthetic branch roads of radio-frequency power all interrupt rf power signal output:
V DC1～V DC3Be OV, all less than V R1V 1～V 3Be L level (OV), V 10～V 03All be OV also, so V 4=OV.So V R2＞V R3＞V 4, V 5Be L level, V 6Be H level, V 7Be the H level.SW 3Disconnect; SW 4Connection, the loop of SK remain connection; The luminous warning of LED.Right therefore the time three synthetic branch roads of power all interrupt rf power signal output, it must be zero that complete machine is broadcast power, complete machine just is forced to break fully by this.
In circuit shown in the accompanying drawing 4, if, for example establish the Third Road input port and be connected to greater than V with in its three input ports any one R1(i.e. fixing V DC3＞V R1) direct current high potential lead-in wire on, then this circuit can directly be broadcasted as " uninterruptedly " of the high power amplifier transmitter of radio-frequency power composite solid state that adopts N=2 and be used digital-control circuit.
Circuit shown in the accompanying drawing 5 can be used as N=4 the high power amplifier transmitter of radio-frequency power composite solid state " uninterruptedly " broadcasting usefulness simple and easy practical digital-control circuit.It is to have increased by the four tunnel input comparison circuit (capacitor C on accompanying drawing 4 bases 104, resistance R 128～R 129, resistance R 107, R 108, amplifier M 8Form.V DC4Input draw end and link C 104, R 128, R 129The public end that draws, C 104, R 129Other end ground connection all, R 128The other end link M 8In-phase input end, M 8Inverting input link R 107, R 108The public end that draws.M 8Output draw end and connect R 130One draw end, R 130, R 132The public end that draws link R 131One draw end, R 131Another draw end and link M 4In-phase input end), the accurate level forming circuit (resistance R of the 4th road sign 130, R 132Form) and subsequent the input addition resistance R of addition amplifying circuit 131, and corresponding change simultaneously big R shown in the accompanying drawing 4 118～R 119, R 120～R 122Resistance forms.Obviously in the loop any one the road or identical with the operation principle of accompanying drawing 4 during the synthetic branch road interrupt power signal output of any two way RF powers simultaneously, transmitter should be able to be finished the also warning of " uninterruptedly " broadcasting (work) function well.
Simple and easy practical design method is to copy accompanying drawing 4 circuit design methods to increase corresponding input comparison circuit number and nominal level to form the input addition resistance number of circuit number and subsequent addition amplifying circuit and corresponding change R simultaneously when N＞4 118, R 119And R 120～R 122Resistance get final product.Because from the practical viewpoint N of engineering road any one the road or when the synthetic branch road of any two way RF powers interrupts radio frequency output simultaneously, the emission function is finished " uninterruptedly " well and is broadcasted (work) function and can satisfy practicality and required.
Certainly if will be in N=2 or N 〉=4 o'clock press accompanying drawing 2; the design spirit of accompanying drawing 4; according to when certain (several or one by one several; N-1 at most) when interrupting rf power signal output, the synthetic branch road of radio-frequency power make forward direction transmission power P o reduce or reduce one by one (reporting to the police simultaneously) automatically with the certain magnitude in every rank (for example near 50% magnitude) with digital control scheme; the working direct current of guaranteeing or guarantee one by one to remain the radio frequency semiconductor high power device of the synthetic branch road costliness of the power that does not interrupt the radio frequency power output signal remains automatic level control function when being positioned at the place of safety automatically, adheres to that it also is complete feasible that principle till " uninterruptedly " broadcasting (work) is when N radio-frequency power synthesizes branch road and all interrupt rf power signal designs.
Be familiar with just being understood that the present invention can expand to and the electronic level of dicyclo after the operation principle of accompanying drawing 4, control loop has multiple different connected mode.For example the switch of diverter switch draws end and only is connected with the first automatic electric-level control loop, provides all " uninterruptedly " broadcasting (work) function and constant " backup " function that it designed in double ring automatic power level control circuit originally of second loop; Perhaps first control loop is finished outside first automatic level control function, " uninterruptedly " broadcasting (work) function is finished in the part, the synthetic branch road power amplifier of a power interrupt radio frequency when exporting " uninterruptedly " program change into and do not disconnect first control loop and the automatic electric-level control action of first control loop is weakened.Certainly also to make corresponding modification for the design of its " uninterruptedly " program of above-mentioned these specific embodiments.……
Accompanying drawing 3 shows the present invention and also can expand to common monocycle automatic electric-level control (comprising the automatic electric-level control that realizes by DC power supply voltage or its working direct current of control radio frequency semiconductor function) circuit and be connected, finish the controlled function of unit " uninterruptedly " broadcasting (work) together, as long as the automatic electric-level control action that weakens the monocycle automatic level control circuit respectively by required " uninterruptedly " program (for example, monocycle direct current automatic electric-level control voltage is propped up way N according to synthetic power do the distribution of respective steps formula, import the direct-current control voltage input of monocycle automatic electric-level control loop then by " uninterruptedly " program respectively).Can realize unit " uninterruptedly " broadcasting (work) function equally.
Basic principle of the present invention is equally applicable to that non-homophase power is synthetic, the synthetic way N of different radio frequency power.For accompanying drawing 2～accompanying drawing 5, the design of circuit also can change or increase and decrease.As V DC1～V DCnLevel itself more stable and suitable or carried out the specific aim design in the parts outside circuit provided by the invention or adjusted, then input relatively and nominal level formation circuit one or both of all may save, even failure alarm circuit also can save.So the simplest transmitter, " uninterruptedly " broadcasting (work) function are counted circuit and are comprised that addition is amplified, " uninterruptedly " program forms switching switch circuit.V DC1～V DCnThe output of direct corresponding input addition amplifying circuit is drawn input that end and " uninterruptedly " program form circuit and is drawn the end knot and connect, end and diverter switch are drawn in the output that " uninterruptedly " program forms circuit automatically controlled draw hold link to each other, the switch of diverter switch draws and holds the corresponding end that draws of linking automatic level control circuit.Can make anti-phase input connection into as long as circuit design permits some homophase input to connect, anti-phase input connects variable more homophase input and connects,
Diverter switch integrated or branch treasure spare or their combination.They are diode, triode, field effect transistor, controllable silicon, relay, photoelectric coupled device and their combination or integrated formed diverter switch that can be automatically controlled.
Type of alarm of the present invention also can change sound, other coloured light, digital demonstration into, the gauge outfit purport is shown or their compound mode.
Basic functional principle of the present invention is not touched the high standing wave automatic protection functions of multichannel, so the high standing wave automatic protection functions of the compatible multichannel of the present invention circuit.
Owing to be provided with the previous imformation memory element of dc control signal in automatic level control circuit, thereby the transient process of " uninterruptedly " Automatic Program switching moment also is very mild.
The present invention with extremely low cost realized the synthetic single portion transmitter of common employing radio-frequency power because of certain (several or one by one several, N-1 at most) when interrupting radiofrequency signal output, the synthetic branch road of power adheres to " uninterruptedly " broadcasting (work) function, exempt the possibility that the radio frequency semiconductor high power device of the synthetic branch road effect costliness of power that residue do not interrupt the radio frequency power output signal damages even burns because of blasting simultaneously; Also avoided such as the overheated impaired resistance of the uneven radio-frequency power absorption resistance of the power combiner same period increase in addition burn may; Greatly reduce unit and finish the possibility of interrupting broadcasting (work) because of power complex RF power amplifier fault; The complete machine overall with band operating characteristic of transmitter is still good; And it is, also well compatible with the high standing wave automatic protection functions of multichannel with monocycle or dicyclo automatic level control function compatibility; Transmitted power level is steady, and other performance index also well keep.Thereby the present invention can be used as transmitter " uninterruptedly " broadcasting (work) digital-control circuit and protective circuit in broadcasting, TV, communication, radar and the similar transmitter thereof.

Claims (6)

1, a kind of can with monocycle or double ring automatic power level control circuit good combination; with the high vswr protection automatic circuit of multichannel compatibility, mainly comparison, nominal level form, addition is amplified, " uninterruptedly " program forms by importing, diverter switch and failure alarm circuit are formed to be used to adopt the high power amplifier transmitter of N way RF power composite solid state " uninterruptedly " broadcasting (work) digital-control circuit to it is characterized in that digital-control circuit.
Connect the transmitter of N=3 " uninterruptedly " broadcasting (work) function digital-control circuit with the double ring automatic power level control circuit knot:
The input comparison circuit comprises: three in-phase voltage comparators.V D01～V D03End is drawn in the input that is transfused to three road in-phase voltage comparators respectively.Capacitor C 101, resistance R 101～R102, R107～R108 and voltage comparison amplifier M1 constitute first via in-phase voltage comparator; Capacitor C 102, resistance R 103～R104, R107～R108 and voltage comparison amplifier M2 constitute the second road in-phase voltage comparator; Capacitor C 103, resistance R 105～R106, R107～R108 and voltage comparison amplifier M3 constitute Third Road in-phase voltage comparator.The public end that draws of C101, R101, R102 links V D01Input draw end, the other end of C101 and R101 is ground connection all, the other end of R102 connects the in-phase input end of M1; The public end that draws of C102, R103, R104 links V DC2Input draw, the other end of C102 and R103 is ground connection all, the other end of R104 connects the in-phase input end of M2; Form comparison reference voltage V R1Potential-divider network resistance R 107, R108 public draw the inverting input that end links M1～M3 simultaneously, the lead-in wire of another termination of R107 supply voltage+Vcc, the other end ground connection of R108.The output port of M1 links the input of the resistance R 109 of subordinate's first nominal level formation circuit and draws end; Second nominal level of the output binding subordinate of M2 forms the input of the resistance R 112 of circuit and draws end; The 3rd nominal level of the output binding subordinate of M3 forms the input of the resistance R 115 of circuit and draws end;
Nominal level forms circuit and comprises: first nominal level that divider resistance R109, R110 constitute forms circuit; Second nominal level that divider resistance R112, R113 constitute forms circuit; The 3rd nominal level that divider resistance R115, R116 constitute forms circuit.End is drawn in the public input of drawing the input resistance R111 of end binding subordinate addition amplifier of R109, R110.End is drawn in the public input of drawing the input resistance R114 of end binding subordinate addition amplifier of R112, R113.End is drawn in the public input of drawing the input resistance R117 of end binding subordinate addition amplifier of R115, R116;
The addition amplifying circuit comprises: input resistance R111, R114, R117, the resistance R 118 of major decision addition amplification quantity, R119 and amplifier M4.The public in-phase input end mouth that draws end binding M4 of R111, R114, R117, R118 and R119 interlink publicly draw the anti-phase input that terminates to M4 and draw end, the other end of R119 and the output of M4 are drawn end and are connected, and the public end that draws of input that the output port of M4 and subordinate " uninterruptedly " program forms two input resistance R123, R124 of circuit is connected;
" uninterruptedly " program forms circuit and comprises: buffering input resistance R123, R124 on two, amplifier M5 and M6 and formation comparison reference voltage V R2, V R8Three resistance R 120～R122 of resistance pressure-dividing network.The in-phase input end that end is attached to M5 is drawn in the output of R123, the inverting input that end is attached to M6 is drawn in the output of R124, the common port of R120, R121 links the inverting input of M5, and the public end that draws of the homophase input resistance R126 of R121, R122 and the fault newspaper amplifier M7 of subordinate links M 6In-phase input end.The output port of M5 is linked the diverter switch SW of subordinate 3The control input input of drawing the anti-phase input resistance R125 of end 203 and warning circuit M7 draw end; The output port of M6 is linked another diverter switch SW thereafter 4Control input draw end 206;
Switching switch circuit comprises: but electric-controlled switch SW 3And SW 4Drawing end 203,206 is respectively that end is drawn in the automatically controlled input of SW3, SW4; SW 3Signal input, output port divide other 201 and 202; The signal input of SW4, output port are respectively 204,205; Draw end 201 and 202; The signal input of SW4, output port are respectively 204,205; Draw the first automatic electric-level control loop direct-current control voltage Vl that end 201 links SK 1Input lead l 1Draw end 202 and receive the input CONTROLLED POTENTIAL device W of the first automatic electric-level control loop of SK 1Input draw end.W 1The center draw the in-phase input end that end is still linked the buffer amplifier A4 of former SK.The input lead l2 that end 204 is linked the second automatic electric-level control loop direct-current control voltage Vl2 of SK is drawn in the signal input of SW4, and output is drawn end 205 and linked second automatic electric-level control loop input CONTROLLED POTENTIAL device W 2The center draw the public end that draws of end and the in-phase input end mouth of amplifier A5,
Failure alarm circuit comprises: input resistance R125 and R126 amplifier M7, output current limiting resistance R 127, LED.The end of R125 is linked the output port of M5, and the other end is linked the inverting input mouth of M7; The end of R126 is linked the public of R121, R122 and is drawn on the end, and the other end links M 7The in-phase input end mouth; R127 is serially connected with between the anode of the output port of M7 and LED, the LED minus earth.
2, the transmitter " uninterruptedly " that it is characterized in that can local reconfiguration expanding to N=2 according to the transmitter " uninterruptedly " of claim 1 broadcasting (work) digital-control circuit transmitter " uninterruptedly " of broadcasting (work) digital-control circuit: N=3 is broadcasted the V of (work) digital-control circuit DC1～V DC3Any tool of drawing in the end of three inputs be connected to greater than V VR1Direct current high potential lead-in wire on.
3, according to claim 1 transmitter " uninterruptedly " broadcasting (work) digital-control circuit, it is characterized in that being expanded and adapt to N=4,5,6 ... situation, increase the four tunnel input relatively and the 4th road sign transmitter " uninterruptedly " that can expand to N=4 after claiming the input addition resistance of level forming circuit and addition amplifying circuit broadcast (work) function digital-control circuit:
V DC4Input draw end and link C 104, R 128, R 129The public end that draws, C 104, R 129Other end ground connection all, R 128The other end link M 8In-phase input end, M 8Inverting input link R 107, R 108The public end that draws.M 8Output draw end and connect R 130One draw end, R 130, R 132The public end that draws link R 131One draw end, R 131Another draw end and link M 4The in-phase input end mouth.
4, transmitter according to claim 1 " uninterruptedly " broadcasting (work) digital-control circuit, it is characterized in that input is compared and nominal level forms one of circuit or the both may save, even failure alarm circuit also can save, so the simplest transmitter " uninterruptedly " broadcasting (work) digital-control circuit comprises that addition is amplified, the formation of " uninterruptedly " program, switching switch circuit: V DC1～V DC3The output that end, addition amplifying circuit are drawn in the input of the corresponding input addition of direct current amplifying circuit is drawn input that end and " uninterruptedly " program form circuit and is drawn the end knot and connect, and the output of " uninterruptedly " program formation circuit draws that end links to each other with the automatically controlled port of diverter switch, the switch of diverter switch draws and holds the corresponding end that draws of linking automatic level control circuit.
5, transmitter according to claim 1 " uninterruptedly " is broadcasted (work) digital-control circuit, and it is characterized in that being extended to double ring automatic power level control circuit has multiple different connected mode:
The switch of " diverter switch " draws end and only is connected with the first automatic electric-level control loop, provides all " uninterruptedly " broadcasting (work) and " backup " function of constant its original design in double ring automatic power level control circuit of second control loop.
6, transmitter according to claim 1 " uninterruptedly " broadcasting (work) digital-control circuit is characterized in that: the present invention also can expand to common monocycle automatic electric-level control (comprising the automatic electric-level control that realizes by DC power supply voltage or its working direct current of control radio frequency semiconductor power amplifier) circuit and be connected; Monocycle direct current automatic electric-level control voltage is propped up way N according to synthetic power do the distribution of respective steps formula, import the direct-current control voltage input of monocycle automatic electric-level control loop then by " uninterruptedly " program respectively.
CN 91108227 1991-11-09 1991-11-09 Numerically controlled non-interrupted operating circuit for broadcasting transmitter Expired - Fee Related CN1022365C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 91108227 CN1022365C (en) 1991-11-09 1991-11-09 Numerically controlled non-interrupted operating circuit for broadcasting transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 91108227 CN1022365C (en) 1991-11-09 1991-11-09 Numerically controlled non-interrupted operating circuit for broadcasting transmitter

Publications (2)

Publication Number Publication Date
CN1061877A true CN1061877A (en) 1992-06-10
CN1022365C CN1022365C (en) 1993-10-06

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Application Number Title Priority Date Filing Date
CN 91108227 Expired - Fee Related CN1022365C (en) 1991-11-09 1991-11-09 Numerically controlled non-interrupted operating circuit for broadcasting transmitter

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103546189A (en) * 2013-11-13 2014-01-29 苏州华士无线科技有限公司 Radio-frequency front end circuit and system
CN108259102A (en) * 2017-12-18 2018-07-06 东莞茂强电子科技有限公司 A kind of two-conductor line fire-fighting public address system for having fault alarm

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103546189A (en) * 2013-11-13 2014-01-29 苏州华士无线科技有限公司 Radio-frequency front end circuit and system
CN103546189B (en) * 2013-11-13 2016-04-13 苏州华士无线科技有限公司 Radio-frequency (RF) front-end circuit and system
CN108259102A (en) * 2017-12-18 2018-07-06 东莞茂强电子科技有限公司 A kind of two-conductor line fire-fighting public address system for having fault alarm

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CN1022365C (en) 1993-10-06

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