CN217216549U - Medium-wave full-band transmitter control system - Google Patents
Medium-wave full-band transmitter control system Download PDFInfo
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- CN217216549U CN217216549U CN202220896002.3U CN202220896002U CN217216549U CN 217216549 U CN217216549 U CN 217216549U CN 202220896002 U CN202220896002 U CN 202220896002U CN 217216549 U CN217216549 U CN 217216549U
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The utility model discloses a medium-wave full-frequency-band transmitter control system, which comprises a control unit, an excitation unit and a tuning unit which are connected in sequence, wherein the control unit is connected with the tuning unit, the control unit is used for being connected with an upper computer, and controls the excitation unit to generate excitation signals according to the signal output control signals of the upper computer, and controls the tuning unit to carry out resonance matching on the excitation signals; the excitation unit is used for selecting a set frequency signal or an external excitation signal as an excitation signal to be sent to the transmitter according to the external excitation signal; the tuning unit is used for selecting needed circuit parameters according to the second control signal of the control unit to form a resonant frequency circuit and tuning and outputting the excitation signal. By setting the frequency, the full-band excitation signal is obtained, the intermediate-frequency full-band broadcasting is realized, the cost is reduced, and the time required by frequency conversion is saved.
Description
Technical Field
The utility model belongs to the technical field of the medium wave transmission technique and specifically relates to a full frequency channel transmitter control system of medium wave is related to.
Background
The frequency range of medium wave broadcasting is 531kHz-1602kHz, domestic medium wave transmitting systems are in a single-machine fixed-frequency broadcasting mode, one device can only realize broadcasting at a single frequency, only a few stations adopt a single-machine double-frequency technology and are in a switch switching mode, although some parameters realize fixed-point setting switching of servo tuning, the device can only meet the preset state, and in order to realize the medium wave full-frequency range broadcasting task, the device can only realize the medium wave full-frequency range broadcasting task by consuming multiple hardware resources by multiple devices, so that the cost is wasted, the occupied area is large, the maintenance is inconvenient, and the requirement of the full-frequency range cannot be met.
Based on the fact that the existing medium wave transmitting system broadcasts according to the prefabricated single frequency, when the broadcasting frequency needs to be changed, the frequency changing work is complex, corresponding technical parameters needing to be changed are more, the requirement on the technical level of operators is high, the time needed for frequency changing is relatively long, and sometimes, 1-2 days are needed for changing the frequency once. With the market demand, the full band switching technology will become the development trend in the future.
Therefore, how to implement the medium-band full-band broadcasting and reduce the time required for frequency conversion is a problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a full frequency channel transmitter control system of medium wave, on the basis of single-frequency medium wave transmitter, improve, increase control, carry out the frequency by the host computer and set for, select between frequency and the outer frequency signal that swashs, carry out the plastic to excitation signal and enlarge, obtain radiofrequency signal, tuning circuit selects box-like resonance parameter according to radiofrequency signal frequency, carry out the resonance to radiofrequency signal and match, realize the broadcast of the full wave band of intermediate frequency, and reduce cost practices thrift the frequency conversion required time.
The above technical scheme of the utility model can be realized through following technical scheme to the purpose:
a control system of a medium-wave full-band transmitter comprises a control unit, an excitation unit and a tuning unit which are sequentially connected, wherein the control unit is connected with the tuning unit and is used for being connected with an upper computer, outputting a control signal according to a signal of the upper computer, controlling the excitation unit to generate an excitation signal and controlling the tuning unit to perform resonance matching on the excitation signal; the excitation unit is used for selecting a set frequency signal or an external excitation signal as an excitation signal to send to the transmitter according to the external excitation signal; the tuning unit is used for selecting needed circuit parameters according to the second control signal of the control unit to form a resonant frequency circuit and tuning and outputting the excitation signal.
The utility model discloses further set up to: the control unit is controlled by a PLC and is used for setting frequency according to the instruction of an upper computer and carrying out corresponding operation according to the current state of the transmitter when the set frequency is effective frequency; if the current state of the transmitter is a high-voltage state, prohibiting signal switching, and controlling whether the high voltage of the transmitter is cut off or not according to whether a high-voltage instruction needs to be cut off or not; and when the current state of the transmitter is a non-high-voltage state, outputting a frequency switching control signal to the excitation unit, and switching and selecting the external excitation signal and the set frequency signal.
The utility model discloses further set up to: the control unit sets frequency in a BCD code mode and controls the oscillator to output a set frequency signal; when the current state of the transmitter is a non-high-voltage state, the control unit searches corresponding tuning parameters according to the frequency of the excitation signal, controls the tuning unit to perform resonance matching on the excitation signal, and outputs a resonance excitation signal.
The utility model discloses further set up to: the tuning unit comprises a preceding stage tuning module, a modulation power amplifier module, a power synthesis module and a rear stage tuning module which are sequentially connected, the control unit is respectively connected with the preceding stage tuning module and the rear stage tuning module, and the preceding stage tuning module controls preceding stage parameter selection and is used for matching excitation signal frequency in a large-range resonance mode; the post-stage tuning module controls the parameter selection of the final stage and is used for matching the frequency of the excitation signal in a small-range resonance mode; the modulation power amplification module is used for amplifying the resonance excitation signal output by the front-stage tuning module, and the power synthesis module is used for synthesizing the power of the modulation power amplification unit.
The utility model discloses further set up to: the modulation power amplification module comprises a modulation transformer and a modulation amplification circuit which are sequentially connected, wherein the secondary side of the modulation transformer is used for pushing the modulation amplification circuit, and the modulation amplification circuit further amplifies the excitation signal.
The utility model discloses further set up to: the front tuning module comprises a front amplifying circuit and a front tuning circuit which are sequentially connected, wherein the input of the front amplifying circuit is connected with the output of the excitation unit and is used for amplifying the excitation signal to obtain a front amplifying signal, and the front tuning circuit is used for filtering and resonant matching the front amplifying signal to obtain a front tuning signal.
The utility model discloses further set up to: the pre-stage amplifying circuit comprises a pre-stage first transformer, a pre-stage first buffer circuit, an emitter follower amplifying circuit, a pre-stage second transformer, a pre-stage second amplifying circuit and a pre-stage third transformer which are sequentially connected, wherein after the excitation signal is superposed with direct current bias voltage by the secondary side of the pre-stage first transformer, the excitation signal is shaped by the pre-stage first buffer circuit and then output to obtain a radio frequency signal; the radio frequency amplification circuit comprises a single-ended push-pull emitter follower circuit and is used for following a radio frequency signal; the first-stage second transformer is a pulse transformer, and the first-stage second amplifying circuit comprises a half-bridge amplifying circuit and is used for amplifying a secondary signal of the first-stage second transformer in an upper half cycle and a lower half cycle respectively; and the front-stage third transformer is connected with one output end of the front-stage second amplifying circuit and is used for sampling current.
The utility model discloses further set up to: the excitation signal is a sinusoidal signal and the radio frequency signal is a square wave signal.
The utility model discloses further set up to: the excitation unit comprises a set frequency amplification module, an external excitation signal amplification module, a switching module and an output module, wherein the input of the set frequency amplification module is connected with the control unit, and the output of the set frequency amplification module is connected with the switching module; the switching module is respectively connected with the set frequency amplification module, the external excitation signal amplification module, the switching module and the output module, and is used for selecting between the set frequency signal and the external excitation frequency signal according to the size of the external excitation signal, taking a selection result as an excitation signal, and the output module is used for outputting the excitation signal.
The utility model discloses further set up to: the set frequency amplifying module comprises a set frequency signal generating circuit and a set frequency amplifying circuit which are sequentially connected, wherein the input of the set frequency signal generating circuit is connected with the control circuit and is used for generating a set frequency signal according to the set frequency, and the set frequency amplifying circuit is used for amplifying the set frequency signal; the external excitation signal amplification module comprises an external excitation signal isolation amplification circuit and is used for amplifying the external excitation signal; the switching circuit comprises a detection control circuit and a switch, the input of the detection control circuit is connected with the output of the external excitation signal isolation amplifying circuit, and the switch is controlled to act according to the size of the external excitation signal.
Compared with the prior art, the beneficial technical effects of this application do:
1. the control circuit is arranged and connected with the upper computer, frequency parameters are set according to the set frequency of the upper computer, set frequency signals with corresponding frequencies are generated, and generation of signals with different frequencies of medium-wave full frequency is achieved;
2. furthermore, the radio frequency signal is amplified and output by shaping the excitation signal, and the electrical parameter of the radio frequency signal is detected, so that the real-time monitoring of the radio frequency signal is realized;
3. furthermore, the radio frequency signal is amplified and subjected to frequency resonance matching by arranging the tuning unit, so that the resonance frequency of the tuning circuit is consistent with the frequency of the radio frequency signal, and the maximum efficiency transmission of the radio frequency signal is realized.
Drawings
FIG. 1 is a schematic diagram of a control circuit configuration according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an excitation unit configuration according to an embodiment of the present application;
FIG. 3 is a block diagram of a pre-amplifier circuit according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a pre-tuned circuit configuration according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a modulation power amplifier module according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an excitation signal amplifying module according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a set frequency amplification module according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a switch control circuit according to an embodiment of the present application;
FIG. 9 is a schematic diagram of an output module according to an embodiment of the present application;
FIG. 10 is a schematic diagram of a front portion of a pre-amplifier circuit according to an embodiment of the present application;
FIG. 11 is a schematic diagram of a portion of a preceding stage amplifier circuit according to an embodiment of the present disclosure;
fig. 12 is a schematic structural diagram of a modulation power amplifier module according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides a full frequency channel transmitter control system of medium wave, as shown in fig. 1, including the control unit who connects gradually, excitation unit, tuning unit, control unit is used for being connected with the host computer, receives the frequency information of setting for of host computer, sets for the frequency setting, control excitation unit switches between setting for frequency signal and external excitation signal, control tuning unit enlargies radio frequency signal, selects suitable circuit parameter, carries out the resonance with radio frequency signal and matches to realize the medium wave and broadcast.
The control unit is controlled by a PLC (programmable logic controller), the positions of the dial switches are controlled in a BCD (binary-coded decimal) code mode according to the set frequency, and different dial positions of the plurality of dial switches are arranged and correspond to different set frequencies.
The control unit also judges the set frequency, and when the set frequency belongs to the range of the medium wave frequency band, the set frequency is considered as the effective frequency, otherwise, the set frequency is the ineffective frequency.
When the set frequency is the effective frequency, detecting and judging the state of the transmitter, and carrying out corresponding operation according to the current state of the transmitter; if the current state of the transmitter is a high-voltage state, the signal switching is forbidden and the high-voltage state switching frequency is prompted, at the moment, whether a high-voltage cutting instruction is received or not is detected, if the upper computer gives the high-voltage cutting instruction, the control unit forwards the high-voltage cutting instruction to the transmitter, the transmitter executes high-voltage cutting action, and if the upper computer gives a high-voltage non-cutting instruction, the control unit does not perform any operation;
the control unit detects the state of the transmitter, switches frequency signals when detecting that the current state of the transmitter is a non-high-voltage state, outputs frequency switching control signals to the excitation unit, and switches and selects external excitation signals and set frequency signals to achieve switching between full-band frequency signals.
As shown in fig. 2, the excitation unit includes a set frequency amplification module, an external excitation signal amplification module, a switching module, and an output module, wherein an input of the set frequency amplification module is connected to the control unit, and an output of the set frequency amplification module is connected to the switching module; the switching module is respectively connected with the set frequency amplification module, the external excitation signal amplification module and the output module and is used for selecting between the set frequency signal and the external excitation frequency signal, taking a selection result as an excitation signal, and the output module is used for outputting the excitation signal.
The set frequency signal generating circuit comprises a BCD code frequency divider and an oscillator which are connected in sequence and used for generating a set frequency signal according to a set frequency.
The set frequency amplifying circuit is used for amplifying the set frequency signal.
The external excitation signal amplification module comprises an external excitation signal isolation and amplification circuit and is used for isolating and amplifying the external excitation signal to obtain an amplified external excitation signal.
The switching circuit comprises a detection control circuit and a switch, the input of the detection control circuit is connected with the output of the external excitation signal isolation amplifying circuit, the switch is controlled to act according to the amplified external excitation signal, and switching is carried out between the external excitation signal and the set frequency signal.
If the external excitation signal meets the requirement, the amplified external excitation signal controls the detection control circuit to output, controls the selector switch to open the external excitation signal channel, and closes the set frequency signal channel to output the external excitation signal; if the size of the external excitation signal is smaller than the requirement, the amplified external excitation signal controls the change-over switch to turn off the external excitation signal channel, and the set frequency signal channel is opened to output the set frequency signal.
The tuning unit comprises a preceding stage tuning module, a modulation power amplifier module, a power synthesis module and a rear stage tuning module which are sequentially connected, the control unit is respectively connected with the preceding stage tuning module and the rear stage tuning module, and the preceding stage tuning module controls preceding stage parameter selection and is used for matching excitation signal frequency in a large-range resonance mode; the post-stage tuning module controls the parameter selection of the final stage and is used for matching the frequency of the excitation signal in a small-range resonance mode; the modulation power amplifier module is used for amplifying the resonance excitation signal output by the preceding stage tuning module, and the power synthesis module is used for synthesizing the power of the modulation power amplifier unit.
The front tuning module comprises a front amplifying circuit and a front tuning circuit which are sequentially connected, wherein the input of the front amplifying circuit is connected with the output of the excitation unit and is used for amplifying the excitation signal to obtain a front amplifying signal, and the front tuning circuit is used for filtering and resonant matching the front amplifying signal to obtain a front tuning signal.
As shown in fig. 3, the preceding stage amplifying circuit includes a preceding stage first transformer T3, a preceding stage buffer circuit N3, an emitter follower amplifying circuit, a preceding stage second transformer T4, preceding stage second amplifying circuits V9 and V10, and a preceding stage third transformer T5, which are connected in sequence, and the excitation signal is superimposed with a dc bias by the secondary stage of the preceding stage first transformer T3, and then output after being shaped and buffered by the preceding stage buffer circuit, so as to obtain a buffered radio frequency signal; the emitter follower amplifying circuit comprises a single-ended push-pull emitter follower circuit and is used for carrying out follower amplification on the radio-frequency signal; the front stage second transformer T4 is a pulse transformer.
As shown in fig. 4, the front-stage tuning circuit includes a filter circuit, the filter circuit is composed of a first tunable capacitor, a first tunable inductor L1 and a primary stage of a front-stage tuning transformer, which are connected in series, and filters an amplified signal output from the front-stage amplifying circuit, and after the amplified signal is output from the front-stage tuning transformer, the amplified signal is output after current sampling by the front-stage tuning output transformer, and a second tunable inductor L2 is connected in parallel to an output position, and functions to match the front-stage tuning output with the input of the modulation power amplifier. The capacitance of the first tunable capacitor, the inductance of the first tunable inductor L1, and the inductance of the second tunable inductor L2 can be adjusted by the control unit to make the output of the first tunable capacitor resonate in the working band. The radio frequency output of the front stage tuning circuit is used for modulating the input of the power amplifier.
As shown in fig. 5, the modulation power amplifier module includes a modulation transformer T7 and a modulation amplifying circuit, which are connected in sequence, the modulation transformer T7 is used for amplifying the excitation signal, and the modulation amplifying circuit further amplifies the excitation signal.
The modulation transformer T6 is used for isolation, and the modulation transformer T9 is used for isolation and output of the radio frequency signal.
In an embodiment of the present application, as shown in fig. 6, the external excitation signal amplifying module is configured to couple the external excitation signal in an isolated manner through a first transformer T1, and transmit the external excitation signal to the external excitation signal amplifying circuit, where the external excitation signal amplifying circuit includes an NPN transistor V1 and a peripheral resistor R3/R4/R6, the resistors R3/R4 are connected in series, a connection point of the resistors is used for setting a base potential of the transistor V1, and the resistor R6 is used for current limiting of a collector of the transistor V1.
The output of the external excitation signal amplifying circuit is inverted by an inverter N1A, and then outputs an A signal to the detection control circuit, on the one hand, to one input end of a switch N2A, on the other hand, and the control end of the switch N2A is controlled by a B signal.
As shown in fig. 7, the set frequency signal is generated by the oscillator G1, passes through the set frequency amplifying circuit, and then is amplified twice to be output to an input terminal of the switch N2B.
The set frequency amplifying circuit comprises an NPN triode V2 and a peripheral resistor R8/R9/R10/R11, wherein the resistor R8/R9 are connected in series, the connection point of the resistor R8/R9 is used for setting the base electrode potential of a triode V2, the resistor R10 is used for limiting the collector electrode of a triode V2, and the resistor R11 is used for improving the emitter electrode voltage of a triode V2.
The output of the set frequency amplifying circuit is transmitted to a first inverter circuit after being isolated by a capacitor C5, the first inverter circuit comprises an NPN triode V3 and a peripheral resistor R13/R14, the resistor R13 is used for setting the base potential of an NPN triode V3, the resistor R14 is used as a pull-up resistor and is connected with the collector of the triode V3, the collector of the triode V3 is used as the output end of the first inverter circuit, and the emitter of the triode V3 is grounded.
The second inverter circuit includes an inverter N1B, and a switch N2B has one end connected to the output of the inverter N1B and a control end controlled by the C signal.
The detection control circuit, as shown in fig. 8, includes a two-stage inverter circuit, which has the same structure and adopts a triode as a switching tube for inverting.
The second inverter circuit comprises an NPN triode V4 and a peripheral resistor R16/R17/R19, the resistor R16/R17 are connected in parallel, the connection point of the resistor R19 is used for setting the base potential of the triode V4, the resistor R19 is used as a pull-up resistor and connected with the collector of the triode V4, the emitter of the triode V4 is grounded, and the collector of the triode V4 is used as the output end of the second inverter circuit.
The signal A passes through a second inverter circuit and then outputs a change-over switch control signal C, and the signal A passes through a third-stage inverter circuit and then outputs a change-over switch control signal B. The switch control signal C is used to control the switch N2A, and the switch control signal B is used to control the switch N2B. The switch N2A/N2B is guaranteed to be opened alternately, and one of the set frequency signal and the external excitation signal is selected to be used as an output signal D of the switching circuit.
As shown in fig. 9, the output module includes an inverter N1C for inverting the output signal D and isolating it by a capacitor C10, and then inputting it to the primary side of a transformer T2 and inputting it to the secondary side of a transformer T2 to output the rf signal.
As shown in fig. 10 and 11, after the pre-stage amplifying circuit is isolated and coupled by a transformer T3, a direct-current bias voltage is superimposed on a sine wave high-frequency voltage of a secondary side of the transformer T3 and is connected to an input end of a buffer N3 through a resistor R32, VD6 and VD7 are clamp diodes, when the input voltage is particularly large, six buffers in N3 and N3 can be protected, three-stage shaping amplification is performed, and the output is square waves.
The excitation signal passes through a buffer N3, passes through a single-end push-pull emitter follower circuit, is output to be square wave, and is isolated and coupled to a radio frequency signal rectification circuit by a pulse transformer T4.
The single-end push-pull emitter follower circuit comprises an NPN triode V6, a PNP triode V7 and a peripheral resistor R35/R36/R37/R38, an emitter of a triode V6 is connected with an emitter of a triode V7 to serve as the output of the single-end push-pull emitter follower circuit, and the output of the single-end push-pull emitter follower circuit is connected with the primary side of a transformer T4.
The front-stage second amplifying circuit comprises two power amplifiers V9 and V10 and is used for amplifying two secondary signals of a second transformer T4, a half-bridge amplifying circuit is adopted, and excitation signals generated on the two amplifiers can be inverted signals by adjusting a bias voltage adjusting potentiometer; output via the input of the preceding third transformer T5, and the output of the preceding third transformer T5 is used for current sampling.
The secondary of the transformer T4 adopts a half-bridge type D amplifying circuit to respectively drive the gates of the power field effect transistors V9 and V10; in the upper half of the high frequency, V9 is on and V10 is off, and in the lower half, V9 is off and V10 is on.
Voltage-stabilizing tubes VD9/VD10 connected in series back to back are bridged between GS poles of the V9, so that transient overvoltage which possibly occurs between the GS poles due to transient state is limited, and a field-effect tube V9 is protected.
Similarly, a voltage regulator tube VD11/VD12 connected in series back to back is used for protecting the field effect tube V10.
The intermediate amplifier inhibiting circuit comprises an NPN triode V8 and a peripheral circuit, when the input of the intermediate amplifier inhibiting circuit is in a high level, the triode V8 is conducted, the input high-frequency voltage of N3 is short-circuited, the input of the single-end push-pull emitter follower circuit is 0, and no output exists.
The resistor R31 is the first buffer DC bias voltage adjusting potentiometer in N3, and the adjustment of R31 can make the square wave output by the amplifier symmetrical.
The modulation power amplifier module, as shown in fig. 12, includes two high frequency input transformers T7/T8, 4 secondary of each transformer respectively pushing 4 fets.
Specifically, the first secondary T7-1 of the high frequency input transformer T7 pushes FET V15, the second secondary T7-2 pushes FET V16, the third secondary T7-3 pushes FET V17, and the fourth secondary T7-4 pushes FET V18.
When the field effect transistors V15 and V16 are switched on, the field effect transistors V17 and V18 are switched off; when the fets V15 and V16 are turned off, the fets V17 and V18 are turned on, and a high frequency signal input to the transformer T7 is applied to the primary side of the transformer T9.
The four secondary structures of the high-frequency input transformer T8 are the same, and are respectively a first secondary T8-1 pushing field effect transistor V11, a second secondary T8-2 pushing field effect transistor V12, a third secondary T8-3 pushing field effect transistor V13, and a fourth secondary T8-4 pushing field effect transistor V14.
When the field effect transistors V11 and V12 are switched on, the field effect transistors V13 and V14 are switched off; when the fets V11 and V12 are turned off, the fets V13 and V14 are turned on, and a high frequency signal input to the transformer T8 is applied to the other primary side of the transformer T9.
The primary output voltage of the transformer T9 is an amplified square wave, where V11, V12, V17, and V18 are in-phase, V13, V14, V15, and V16 are in-phase, and V11, V12, V17, and V18 are in anti-phase with V13, V14, V15, and V16, but all waveforms have equal amplitudes.
The transformer T9 is a high-frequency output transformer, the capacitor C29 is a DC blocking capacitor, when the amplifier is normal, the C29 is not active, and when the amplifier is in failure, such as a field effect tube DS short circuit, the C29 has the function of protecting other field effect tubes.
The primary of the transformer T9 synthesizes the output of the two high-frequency power amplifiers, the secondary output is still square wave, the square wave is filtered by the filter to remove harmonic wave and then becomes sine wave, the filter has the function of impedance transformation, the load impedance of the filter is the set value of the user, and the input impedance is about 30 omega. The output of the band-pass filter is sent to an impedance trimmer for adjusting the two variable inductors when the load impedance of the transmitter changes, so that the load impedance of the band-pass filter accurately reaches a nominal value.
A plurality of capacitance inductors are arranged in the tuning circuit, and different capacitance inductors are combined to obtain different band-pass filtering impedances.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model should be covered within the protection scope of the utility model.
Claims (10)
1. A control system of a medium-wave full-band transmitter is characterized by comprising a control unit, an excitation unit and a tuning unit which are sequentially connected, wherein the control unit is connected with the tuning unit and is used for being connected with an upper computer, outputting a control signal according to a signal of the upper computer, controlling the excitation unit to generate an excitation signal and controlling the tuning unit to perform resonance matching on the excitation signal; the excitation unit is used for selecting a set frequency signal or an external excitation signal as an excitation signal to be sent to the transmitter according to the external excitation signal; the tuning unit is used for selecting needed circuit parameters according to the second control signal of the control unit to form a resonant frequency circuit and tuning and outputting the excitation signal.
2. The system according to claim 1, wherein the control unit is controlled by a PLC, and is configured to perform frequency setting according to an instruction of an upper computer, and perform corresponding operations according to a current state of the transmitter when the set frequency is an effective frequency; if the current state of the transmitter is a high-voltage state, prohibiting signal switching, and controlling whether the high voltage of the transmitter is cut off or not according to whether a high-voltage instruction needs to be cut off or not; and when the current state of the transmitter is a non-high-voltage state, outputting a frequency switching control signal to the excitation unit, and switching and selecting the external excitation signal and the set frequency signal.
3. The system of claim 2, wherein the control unit performs frequency setting in the form of BCD code to control the oscillator to output the set frequency signal; when the current state of the transmitter is a non-high-voltage state, the control unit searches corresponding tuning parameters according to the frequency of the excitation signal, controls the tuning unit to perform resonance matching on the excitation signal, and outputs a resonance excitation signal.
4. The control system of the medium-frequency full-band transmitter according to claim 1, wherein the tuning unit comprises a front-stage tuning module, a modulation power amplifier module, a power synthesis module and a rear-stage tuning module which are connected in sequence, the control unit is respectively connected with the front-stage tuning module and the rear-stage tuning module, and the front-stage tuning module controls the selection of front-stage parameters for resonant matching of excitation signal frequency in a large range; the post-stage tuning module controls the parameter selection of the final stage and is used for matching the frequency of the excitation signal in a small-range resonance mode; the modulation power amplifier module is used for amplifying the resonance excitation signal output by the preceding stage tuning module, and the power synthesis module is used for synthesizing the power of the modulation power amplifier unit.
5. The system according to claim 4, wherein the modulation power amplifier module comprises a modulation transformer and a modulation amplifier circuit connected in sequence, the secondary of the modulation transformer is used for driving the modulation amplifier circuit, and the modulation amplifier circuit further amplifies the excitation signal.
6. The system according to claim 4, wherein the pre-tuning module comprises a pre-amplifier circuit and a pre-tuning circuit connected in sequence, an input of the pre-amplifier circuit is connected to an output of the excitation unit for amplifying the excitation signal to obtain a pre-amplified signal, and the pre-tuning circuit filters and matches the pre-amplified signal with a resonant frequency to obtain a pre-tuned signal.
7. The system according to claim 6, wherein the pre-amplifier circuit comprises a pre-first transformer, a pre-first buffer circuit, a radio-follower amplifier circuit, a pre-second transformer, a pre-second amplifier circuit, and a pre-third transformer, which are connected in sequence, wherein the excitation signal is superposed with a dc bias voltage at a secondary side of the pre-first transformer, and then shaped by the pre-first buffer circuit and output to obtain a radio frequency signal; the radio frequency amplification circuit comprises a single-ended push-pull emitter follower circuit and is used for following a radio frequency signal; the first-stage second transformer is a pulse transformer, and the first-stage second amplifying circuit comprises a half-bridge amplifying circuit and is used for amplifying a secondary signal of the first-stage second transformer in an upper half cycle and a lower half cycle respectively; and the preceding stage third transformer is connected with one output end of the preceding stage second amplifying circuit and is used for sampling current.
8. The system of claim 7, wherein the excitation signal is a sinusoidal signal and the RF signal is a square wave signal.
9. The control system of the medium-wave full-band transmitter according to claim 1, wherein the excitation unit comprises a set frequency amplification module, an external excitation signal amplification module, a switching module and an output module, wherein the input of the set frequency amplification module is connected with the control unit, and the output of the set frequency amplification module is connected with the switching module; the switching module is respectively connected with the set frequency amplification module, the external excitation signal amplification module, the switching module and the output module, and is used for selecting between the set frequency signal and the external excitation frequency signal according to the size of the external excitation signal, taking a selection result as an excitation signal, and the output module is used for outputting the excitation signal.
10. The system according to claim 9, wherein the set frequency amplifying module comprises a set frequency signal generating circuit and a set frequency amplifying circuit connected in sequence, an input of the set frequency signal generating circuit is connected to the control circuit and is configured to generate a set frequency signal according to the set frequency, and the set frequency amplifying circuit is configured to amplify the set frequency signal; the external excitation signal amplification module comprises an external excitation signal isolation amplification circuit and is used for amplifying the external excitation signal; the switching circuit comprises a detection control circuit and a switch, the input of the detection control circuit is connected with the output of the external excitation signal isolation amplifying circuit, and the switch is controlled to act according to the size of the external excitation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220896002.3U CN217216549U (en) | 2022-04-18 | 2022-04-18 | Medium-wave full-band transmitter control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202220896002.3U CN217216549U (en) | 2022-04-18 | 2022-04-18 | Medium-wave full-band transmitter control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117895957A (en) * | 2024-03-18 | 2024-04-16 | 四川九洲电器集团有限责任公司 | Debugging method based on excitation signal and adjustable transmitter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117895957A (en) * | 2024-03-18 | 2024-04-16 | 四川九洲电器集团有限责任公司 | Debugging method based on excitation signal and adjustable transmitter |
| CN117895957B (en) * | 2024-03-18 | 2024-05-31 | 四川九洲电器集团有限责任公司 | Debugging method based on excitation signal and adjustable transmitter |
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