CN104038248B - A kind of improved vehicle-carried intercom - Google Patents
A kind of improved vehicle-carried intercom Download PDFInfo
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- CN104038248B CN104038248B CN201410279177.XA CN201410279177A CN104038248B CN 104038248 B CN104038248 B CN 104038248B CN 201410279177 A CN201410279177 A CN 201410279177A CN 104038248 B CN104038248 B CN 104038248B
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Abstract
The invention discloses a kind of antijamming capability strong, the improved vehicle-carried intercom that reliability is high, performance is remarkable, it comprises main frame and hand miaow, and main frame comprises aluminum alloy casing and is arranged at the host circuit in aluminum alloy casing; Host circuit comprises pcb board and is arranged at the circuit part on pcb board, and circuit part comprises antenna port, low pass filter, transceiving radio frequency switch, transmitter unit, receiving element, VCO and PLL frequency synthesizer unit, audio frequency and Signaling Processing Unit, audio-frequency power amplifier unit, loud speaker, APC automated power control unit, display unit, microprocessor, D/A processor, power subsystem and grounding system.The present invention adopts multiple electromagnetic shielding in power input line, antenna adapter, loud speaker etc. and suppresses radio frequency interference measure; effectively to reduce on automobile various electromagnetic interference to the impact of Vehicular intercom; reduce the impact of various radio frequency interference, and there is the function such as overvoltage protection, temperature control protection.
Description
Technical field
The present invention relates to Vehicular intercom, what be specifically related to is that a kind of antijamming capability is strong, the improved vehicle-carried intercom that reliability is high, performance is remarkable.
Background technology
Vehicular intercom distance, networking application is apart from farther, and being therefore widely used in multiple industries such as communications and transportation, social service trades, disaster relief and rescue, forest fire protection, emergency communication, is a kind of important wireless communication facility.
On automobile, electromagnetic environment is complicated, the serviceability of extreme influence Vehicular intercom and experience, and the electromagnetic environment of different automobile is also not quite similar.Electromagnetic interference generally comprises the interference signal that automobile engine produces, the interference signal that electronic equipment on automobile produces, the signal that the less radio-frequency that Vehicular intercom is sent out by antenna terminal feeds back, and from the external interference signals that power input line conduction comes, various interference signal is transmitted to Vehicular intercom through power input line and disturbs it normally to work above, produces unnecessary noise; The Radio Frequency Interfere that Vehicular intercom self produces in addition also can conduct the normal work of the electronic equipment on interference automobile through power input line.
Existing Vehicular intercom automobile power source input electromagnetic interference suppresses, usually the both positive and negative polarity end received on circuit board at power input line carries out, the cabling of i.e. both positive and negative polarity input is on circuit boards connected in series magnetic bead, but magnetic bead is because its size limits magnetic flux size, thorough not for High-frequency Interference inhibition, cause and Vehicular intercom is still disturbed.
The radio-frequency power of Vehicular intercom is large, very easily cause the circuit of various radio frequency interference self, particularly when antenna mismatch time, in actual use, antenna damage mismatch causes reflection power large, and the situation of interference Vehicular intercom and damage final power pipe often has generation.
Vehicle power supply voltage fluctuation is larger, the too high Vehicular intercom that causes of frequent power input voltage damages, the rated voltage of Vehicular intercom is 13.8V, and the battery voltage of truck is 24V, do not do the step-down of 24V to 13.8V when often occurring being used in truck, directly 24V is connected on Vehicular intercom and causes Vehicular intercom to burn out.
Summary of the invention
The object of this invention is to provide a kind of improved vehicle-carried intercom, it effectively can reduce various electromagnetic interference on automobile and radio frequency interference, ensures that call between Vehicular intercom is clear and optimizes various radio-frequency (RF) index.
Another object of the present invention is to provide a kind of improved vehicle-carried intercom, and it effectively can improve the dependable with function of Vehicular intercom, improves user satisfaction.
To achieve these goals, the present invention adopts following technical scheme:
A kind of improved vehicle-carried intercom, comprise main frame and hand miaow, described main frame comprises aluminum alloy casing and is arranged at the host circuit in aluminum alloy casing; Described host circuit comprises pcb board and is arranged at the circuit part on pcb board, and circuit part comprises antenna port, low pass filter, transceiving radio frequency switch, transmitter unit, receiving element, VCO and PLL frequency synthesizer unit, audio frequency and Signaling Processing Unit, audio-frequency power amplifier unit, loud speaker, APC automated power control unit, display unit, microprocessor, D/A processor, power subsystem and grounding system;
The positive and negative power supply input line of described power subsystem is coated with at least two ferrite beads respectively;
Described antenna port has antenna adapter, and described aluminum alloy casing offers installing hole, and described antenna adapter to be arranged in this installing hole and to coordinate screwed lock on described aluminum alloy casing by a ring flange; Described sky switches through one end that joint stretches in described aluminum alloy casing and is arranged with ground sleeve, this ground sleeve has two ground strips, these two ground strips be divided into described antenna adapter respective end both sides and respectively by screwed lock on circuit board earth mat Copper Foil, a grounding pin on described antenna adapter and described ground sleeve weld together, and circuit board earth mat Copper Foil to be connected with described aluminum alloy casing by the described grounding pin of described ground sleeve, described antenna adapter, described ring flange and the screw for locking described ring flange and to be formed altogether;
Described loud speaker is coated with Anti-magnetic cap;
The input of described APC automated power control unit is connected to the signal feedback end of described low pass filter, the output of described APC automated power control unit is connected to the control end of transmitter unit, and the output of described microprocessor is connected to the control end of described APC automated power control unit through described D/A converter.
Described transmitter unit has promotion power tube and final power amplifier tube, described promotion power tube, described final power amplifier tube and described VCO and PLL frequency synthesizer unit all good earths on described pcb board; And described promotion power tube is covered with screening cover, described final power amplifier tube is covered with the silver-plated upper cover of fine copper; Be arranged with mask frame outside VCO circuit part in described VCO and PLL frequency synthesizer unit, it is covered with radome.
Described transceiving radio frequency switch adopts Toshiba's high-performance radio-frequency switching diode, and model is JDP2S12CR.
The circuit part of described host circuit also comprises temperature control protected location; described temperature control protected location has negative temperature coefficient resister and heat transfer temperature-control circuit; described negative temperature coefficient resister is installed on the position near the final power amplifier tube of described transmitter unit on described pcb board; described negative temperature coefficient resister is connected to the input of described heat transfer temperature-control circuit, and the output of described heat transfer temperature-control circuit is connected to the control end of described APC automated power control unit.
LCD back lighting drive circuit in described display unit adopts constant-current drive circuit.
Described power subsystem after two-stage voltage stabilizing for described microprocessor provides working power; And the voltage detecting input of described microprocessor is connected with voltage detecting circuit, the Energy control output of described microprocessor is connected with the switching circuit of the complete machine electric power loop being switched on or switched off described power subsystem.
The keyboard lockout switch of described hand miaow and DTMF locking switch all adopt mechanical switch and are all arranged at the front of described hand miaow.
The PTT button of described hand miaow comprises PTT key shell and flexure strip, described PTT key shell has and stretches into the inner and fore-set of the emission switch of corresponding described hand miaow of described hand miaow, one end of described flexure strip is fixed in described hand miaow, and the other end is free end and correspondence is stretched between the emission switch of described fore-set and described hand miaow; Along the corresponding setting in edge with described pcb board corresponding site in one end of described PTT key shell, and leave the spacing gap controlling described PTT key shell pressing quantity between the two.
The spacing pad of elastic buffer is folded with between the interior edge of described PTT key shell and the respective side edge edge of described pcb board.
After adopting such scheme, the follow-on Vehicular intercom of the present invention, by being coated with at least two ferrite beads respectively in the positive and negative power supply input line of power subsystem, its magnetic flux is large, good inhibitory action is had to high-frequency electromagnetic interference, can the effective various high-frequency electromagnetic interference sound come from the conduction of automobile power source input line of filtering, actual use can't hear the interference sound transmitted from automobile engine etc. substantially; And, in the present invention, effective grounding is carried out to antenna adapter, radio frequency interference can be suppressed well, ensure that the call between Vehicular intercom is clear; The present invention is coated with Anti-magnetic cap on a speaker, by basic for whole loud speaker closed shield, effectively prevents the work of influence of magnetic field Vehicular intercom and the overall performance of loudspeaker.APC automatic power control circuitry in the present invention can when changed power particularly antenna mismatch protect Vehicular intercom, reduce radio frequency interference.Owing to adopting above-mentioned electromagnetic shielding and suppressing radio frequency interference measure, improved vehicle-carried intercommunication function of the present invention is well applicable to the electromagnetic environment of various complexity and suppresses radio frequency interference, ensures that call between Vehicular intercom is clear and optimizes various radio-frequency (RF) index.
In the present invention, promote power tube, final power amplifier tube and VCO and PLL frequency synthesizer unit all good earths on pcb board; And promotion power tube is covered with radiating shield case, the end face of final power amplifier tube is covered with the silver-plated radiating shield case of fine copper, mask frame is arranged with outside VCO circuit part in VCO and PLL frequency synthesizer unit, it is covered with radome, suppresses various electromagnetism and radio frequency interference better further.
In the present invention, transceiving radio frequency switch adopts Toshiba's high-performance radio-frequency switching diode, and model is JDP2S12CR.This radio-frequency (RF) switch diode has extremely low radio frequency conducting resistance, low reflection electric capacity and high-isolation, the significant increase radio-frequency performance of Vehicular intercom.
In the present invention, host circuit is provided with temperature control protected location, and it effectively can control the temperature of Vehicular intercom, avoids the overheated Vehicular intercom that causes to damage, and improves reliability and the useful life of Vehicular intercom.
In existing Vehicular intercom, the LCD back lighting drive circuit in display unit adopts constant voltage mode to drive, and backlight illumination can not regulate controlled.In the present invention, LCD back lighting drive circuit in display unit adopts constant-current drive circuit, and current constant mode drives the advantage of backlight to be backlight illumination controlled variable, the impact of device consistency difference is little, ensure good even back degree, and useful life and the reliability of device can be improved, be easy to see clearly frequency and the machine current operating state of display on LCD.
In the present invention, power subsystem for microprocessor provides working power, effectively prevents instantaneous pressure from damaging microprocessor, improves the reliability and stability of complete machine after two-stage voltage stabilizing.And the voltage detecting input of microprocessor is connected with voltage detecting circuit, the Energy control output of microprocessor is connected with the switching circuit of the complete machine electric power loop being switched on or switched off power subsystem.When input supply voltage is too high time, the Energy control output of microprocessor, by the power supply of the complete machine electric power loop of deenergization unit, realizes overvoltage protection, does not damage, improve reliability when ensureing Vehicular intercom input too high voltages.
In the present invention, the keyboard lockout switch of hand miaow and DTMF locking switch all adopt mechanical switch and are all arranged at the front of hand miaow, and driver is easy to the operating state identifying that hand miaow is current, effectively ensures keyboard not misoperation and driving safety.
In the present invention, PTT press-key structure adopts PTT key shell and flexure strip to coordinate, and in one end of PTT key shell along and the edge of described pcb board corresponding site between leave spacing gap, such that PTT button operation comfortableness is good, good springiness, reliability are high.Further, in PTT key shell along and described pcb board respective side edge along between be folded with the spacing pad of elastic buffer, improve PTT button operation comfortableness, elasticity and reliability especially.
Accompanying drawing explanation
Fig. 1 is circuitry theory diagram of the present invention;
Fig. 2 is the schematic block circuit diagram of display unit in Fig. 1;
Fig. 3 is the physical circuit figure of the back lighting constant-current drive circuit in Fig. 2 in display unit;
Fig. 4 is the local circuit theory diagram of power subsystem in Fig. 1;
Fig. 5 is the physical circuit figure of Fig. 4;
Fig. 6 is the vertical view (omission upper cover) of main frame in the present invention;
Fig. 7 is the vertical view (omitting upper cover and circuit board) of main frame in the present invention;
Fig. 8 is the rearview of main frame in the present invention;
Fig. 9 is the Facad structure schematic diagram of hand miaow in the present invention;
Figure 10 is the structural representation of the PPT button of hand miaow in the present invention.
Embodiment
A modification of the present invention type Vehicular intercom, comprise main frame 100 and hand miaow 200, as shown in Figure 6, Figure 7, the host circuit that described main frame comprises aluminum alloy casing 101 and is arranged in aluminum alloy casing 101, the circuit part that described host circuit comprises pcb board 102 and is arranged on pcb board 102.As shown in Figure 1, the circuit part of host circuit comprises antenna port 1, low pass filter 2, transceiving radio frequency switch 3, receiving element 4, audio frequency and Signaling Processing Unit 5, audio-frequency power amplifier unit 6, loud speaker 7, APC automated power control unit 8, transmitter unit 9, VCO and PLL frequency synthesizer unit 10, microprocessor 11, display unit 12, D/A converter 13, power subsystem 14, grounding system 15 and temperature control protected location 16.As shown in Figure 9, Figure 10, hand miaow 200 comprises shell 201 and is arranged at the hand miaow circuit in shell 201, the circuit part that hand miaow circuit comprises pcb board 202 and is arranged on pcb board 202.As shown in Figure 1, the circuit part of hand miaow circuit comprises hand miaow unit 17 and microphone 18.
In the present invention, the basic circuit framework of host circuit and hand miaow circuit is the known technology of this area, does not do detailed expansion at this.Main improvement of the present invention is that the details to each parts of Vehicular intercom carry out is improved, to improve the performance of Vehicular intercom.Specific as follows:
As shown in Fig. 4, Fig. 5, Fig. 6, the positive and negative power supply input line of power subsystem 14 is coated with respectively at least two high-quality ferrite beads 141.The specification of ferrite bead is for 588 Vehicular intercoms, and the ferrite bead size adopted is 4mm in the outer 8mmxD of H8mmxD, will adjust for the quantity of different Vehicular intercom ferrite beads and size according to actual interference situation.Ferrite bead magnetic flux is large, good inhibitory action is had to high-frequency electromagnetic interference, the present invention is all at least coated with the ferrite bead of 2 high-qualitys on positive pole and negative power supply input line, various electromagnetic interference signal effectively can be prevented to be transmitted to by power line the normal work that Vehicular intercom disturbs it, to realize effectively suppressing the interference of various high-frequency electromagnetic.
Antenna port 1 has antenna adapter, as shown in Fig. 6, Fig. 7, Fig. 8, aluminum alloy casing 101 offers installing hole, and antenna adapter 1a to be arranged in this installing hole and to coordinate screwed lock on described aluminum alloy casing 101 by a ring flange 1b.It switches through one end that joint 1a stretches in described aluminum alloy casing 101 and is arranged with ground sleeve 1c, this ground sleeve 1c has two ground strip 1d, 1e, two brace 1d, the respective end of 1e is by linking together with the connecting portion that both are integrally connected, this connecting portion is centered around outside the respective end of antenna adapter 1a, two ground strip 1d, 1e be divided into described antenna adapter 1a respective end both sides and respectively by screwed lock in circuit board earth mat Copper Foil (not shown), a grounding pin 1f on described antenna adapter 1a and described ground sleeve 1c welds together, circuit board earth mat Copper Foil is by ground sleeve 1c, grounding pin 1f, ring flange 1b and being connected with described aluminum alloy casing 101 for the screw of latching flange dish 1b is formed altogether.
Loud speaker 7 is coated with Anti-magnetic cap 71, by basic for whole loud speaker 7 closed shield, effectively prevents the work of influence of magnetic field Vehicular intercom and the overall performance of loud speaker 7.
The input of APC automated power control unit 8 is connected to the signal feedback end of low pass filter 2, the output of described APC automated power control unit 8 is connected to the control end of transmitter unit, and the output of described microprocessor 11 is connected to the control end of described APC automated power control unit 8 through D/A converter 13.The changed power that APC automated power control unit 8 is exported by the non-stage power amplifier detecting transmitter unit 9; and generate corresponding voltage; feed back to automated power control unit 8 and compare through the reference voltage that D/A converter 13 is changed from microprocessor 11; obtain a result and control the driving amplifier of transmitter unit 9 and non-stage power amplifier; make the power stage that transmitting keeps stable; thus can when changed power particularly antenna mismatch protect Vehicular intercom, reduce radio frequency interference.
Described transmitter unit 9 has promotion power tube and final power amplifier tube, and described promotion power tube, described final power amplifier tube and described VCO and PLL frequency synthesizer unit 10 be good earth on described pcb board 102 all; And as shown in Figure 6, described promotion power tube being covered with radiating shield case 9a, the end face of described final power amplifier tube is covered with the silver-plated radiating shield case 9b of fine copper; Be arranged with mask frame outside VCO circuit part in described VCO and PLL frequency synthesizer unit, mask frame be covered with screening cover 10a.
Particularly, the bottom surface (source electrode) of described final power amplifier tube is attached on the silver-plated ground connection base of a fine copper, end face is covered with the silver-plated radiating shield case 9b of fine copper, the installation site described pcb board 102 corresponding to described final power amplifier tube offers through hole, cooling platform is fixed with below this through hole, described ground connection base to be embedded in described through hole and to be stacked and placed on this cooling platform, four angles described pcb board 102 corresponding to described radiating shield case 9b are respectively arranged with ground pad, this four grounded pad welds together with four angles of described radiating shield case 9b are corresponding respectively, during installation, by bolt, radiating shield case 9b, ground connection base and cooling platform are locked together, thus make the source electrode of final power amplifier tube carry out reliable ground by radiating shield case 9b, ground connection base and bolt, achieve source electrode and pcb board 102 and form good earth-return altogether.The source pad of described promotion power tube is directly welded on the ground pad of pcb board 102.
The mask frame of VCO circuit part, the size shape of screening cover 10a and radiating shield case 9a according to the distribution of the physical circuit of different Vehicular intercom take corresponding form fit it.The silver-plated radiating shield case 9b of fine copper carries out mating it according to the profile of the final power amplifier tube of correspondence.
Described promotion power tube, described final power amplifier tube and described VCO and PLL frequency synthesizer unit 10 are taked good grounding measures and coordinate electromagnetic shielding, various electromagnetism and radio frequency interference can well be suppressed, be suitable for the electromagnetic environment of various complexity, ensure that the call between Vehicular intercom is clear.
In the present invention, transceiving radio frequency switch 3 adopts Toshiba's high-performance radio-frequency switching diode, and model is JDP2S12CR.This switching diode has extremely low radio frequency conducting resistance, low reflection electric capacity and high-isolation, the significant increase radio-frequency performance of Vehicular intercom.
Microphone 18 adopts independent grounding mode, effectively reduces outside noise interference.
To the disturbed condition of display circuit, display unit 12 can determine that whether on the circuit board earth mat Copper Foil of display unit, increasing multiple grounding elastic part is pressed onto on aluminum alloy casing according to radio frequency, thus realize the connection strengthening display unit circuit earth mat, the anti-radio frequency interference ability of display unit circuit can be improved after increasing ground strip.
Temperature control protected location 16 has negative temperature coefficient resister 161 and heat transfer temperature-control circuit 162; described negative temperature coefficient resister 161 is installed on the position near the final power amplifier tube of transmitter unit 9 on described pcb board 102; described negative temperature coefficient resister 161 is connected to the input of described heat transfer temperature-control circuit 162, and the output of described heat transfer temperature-control circuit 162 is connected to the control end of described APC automated power control unit 8.Temperature control protected location 16 effectively can control the temperature of Vehicular intercom, avoids the overheated Vehicular intercom that causes to damage, and improves reliability and the useful life of Vehicular intercom.
In existing Vehicular intercom, the LCD illumination driving circuit of display unit adopts constant voltage mode to drive, and backlight illumination can not regulate controlled.As shown in Figure 2 and Figure 3, in the present invention, the LCD illumination driving circuit of display unit 12 adopts constant-current drive circuit, current constant mode drives the advantage of backlight to be backlight illumination controlled variable, the impact of device consistency difference is little, ensure good even back degree, and useful life and the reliability of device can be improved, be easy to see clearly frequency and the machine current operating state of display on LCD.And circuit LED illumination color has three kinds of colors optional in employing Fig. 3.LCD liquid crystal display drive circuit U3 adopts Shanghai Belling to control and drive IC BL55076 or BL55077, this IC adopt bidirectional two-line formula serial bus communication, and driving force is strong, and peripheral components is few.
As shown in Figure 4, Figure 5, described power subsystem 14 after two-stage voltage stabilizing for described microprocessor 11 provides working power.The 5M power supply being supplied to microprocessor 11 (U2) supplies by after two-stage voltage stabilizing circuit (U1 and D4) voltage stabilizing, when the power is turned on, the power supply of 13.8V input manages (D4) voltage stabilizing by second 5.6V voltage stabilizing two again through the voltage stabilizing of a low-power consumption high voltage bearing 5V three terminal regulator (U1), prevent pulsed high pressure from damaging microprocessor, power supply supplies microprocessor use after voltage stabilizing, and this 5M power supply keeps normal output always.Microprocessor 11 adopts dual voltage stabilizing (pressurizer U1 and voltage-stabiliser tube D4) protective circuit; effectively prevent instantaneous pressure from damaging microprocessor; improve the reliability and stability of complete machine; pressurizer U1 selects high voltage bearing CE6275A50 or the HT7550-1 chip of low-power consumption; the high withstand voltage pressurizer shutdown electric current of CE6275A50 or HT7550-1 low-power consumption is less than 10mA, avoids long-time automobile not use and is exhausted by on-vehicle battery.Power subsystem 14 is also provided with overvoltage protection and detects; the voltage detecting input (P03) of microprocessor U2 is connected with voltage detecting circuit, and the Energy control output (P20) of microprocessor U2 is connected with the switching circuit (Q103, Q100) of the complete machine electric power loop being switched on or switched off power subsystem 14.During work; when the voltage of 16.5V or higher is provided to feed cable; this voltage is by divider resistance R14, R15, R16 dividing potential drop; voltage after dividing potential drop is input to the voltage detecting input of microprocessor U2 through resistance R13, and voltage stabilizing didoe D2 has protection microprocessor voltage detecting input can not damage its port effect because the vehicle power supply voltage of input is too high.Whether microprocessor U2 detects the voltage that inputs higher than preset value, when then judging that Vehicular intercom input voltage is too high higher than preset value, the Energy control output of microprocessor U2 exports control signal makes switching tube Q100 close, power supply disconnects, Vehicular intercom cannot be started shooting work, thus making when input supply voltage is much higher than rated voltage 13.8V, Vehicular intercom can not produce damage because input voltage is too high, reliability and stability are better than like product.
As shown in Figure 9, the keyboard lockout switch 203 of hand miaow 200 and DTMF locking switch 204 all adopt mechanical switch and are all arranged at the front of hand miaow 200.Driver is easy to the operating state identifying that hand miaow is current, effectively ensures keyboard not misoperation and driving safety.
As shown in Figure 10, the PTT button of hand miaow comprises PTT key shell 205 and elastic steel sheet 206, described PTT key shell 205 has and stretches into the inner and fore-set 208 of the emission switch 207 of corresponding described hand miaow of described hand miaow 200, the portion integral of described elastic steel sheet 206 forms two installing ring 206a, coordinate screw to be locked in described hand miaow 200 by the bottom of elastic steel sheet 206 by these two installing ring 206a, the upper end of elastic steel sheet 206 is free end and correspondence is stretched between the emission switch 207 of described fore-set 208 and described hand miaow; Along the corresponding setting in edge with described pcb board 202 corresponding site in one end of described PTT key shell 205, and leave the spacing gap 20a controlling described PTT key shell pressing quantity between the two.Made by said structure that PTT button operation comfortableness is good, good springiness, reliability are high.And in described PTT key shell 205 along and described pcb board 202 respective side edge along between be folded with the spacing pad 209 of elastic buffer, improve the operation comfort of PTT button, elasticity and reliability especially.
Claims (9)
1. an improved vehicle-carried intercom, comprises main frame and hand miaow, and described main frame comprises aluminum alloy casing and is arranged at the host circuit in aluminum alloy casing; Described host circuit comprises pcb board and is arranged at the circuit part on pcb board, and circuit part comprises antenna port, low pass filter, transceiving radio frequency switch, transmitter unit, receiving element, VCO and PLL frequency synthesizer unit, audio frequency and Signaling Processing Unit, audio-frequency power amplifier unit, loud speaker, APC automated power control unit, display unit, microprocessor, D/A processor, power subsystem and grounding system; It is characterized in that:
The positive and negative power supply input line of described power subsystem is coated with at least two ferrite beads respectively;
Described antenna port has antenna adapter, and described aluminum alloy casing offers installing hole, and described antenna adapter to be arranged in this installing hole and to coordinate screwed lock on described aluminum alloy casing by a ring flange; One end that described antenna adapter stretches in described aluminum alloy casing is arranged with ground sleeve, this ground sleeve has two ground strips, these two ground strips be divided into described antenna adapter respective end both sides and respectively by screwed lock on circuit board earth mat Copper Foil, a grounding pin on described antenna adapter and described ground sleeve weld together, and circuit board earth mat Copper Foil to be connected with described aluminum alloy casing by the described grounding pin of described ground sleeve, described antenna adapter, described ring flange and the screw for locking described ring flange and to be formed altogether;
Described loud speaker is coated with Anti-magnetic cap;
The input of described APC automated power control unit is connected to the signal feedback end of described low pass filter, the output of described APC automated power control unit is connected to the control end of transmitter unit, and the output of described microprocessor is connected to the control end of described APC automated power control unit through described D/A converter.
2. a kind of improved vehicle-carried intercom according to claim 1, it is characterized in that: described transmitter unit has promotion power tube and final power amplifier tube, described promotion power tube, described final power amplifier tube and described VCO and PLL frequency synthesizer unit all good earths on described pcb board; And described promotion power tube is covered with screening cover, described final power amplifier tube is covered with the silver-plated upper cover of fine copper; Be arranged with mask frame outside VCO circuit part in described VCO and PLL frequency synthesizer unit, it is covered with radome.
3. a kind of improved vehicle-carried intercom according to claim 1, is characterized in that: described transceiving radio frequency switch adopts Toshiba's high-performance radio-frequency switching diode, and model is JDP2S12CR.
4. a kind of improved vehicle-carried intercom according to claim 1, it is characterized in that: the circuit part of described host circuit also comprises temperature control protected location, described temperature control protected location has negative temperature coefficient resister and heat transfer temperature-control circuit, described negative temperature coefficient resister is installed on the position near the final power amplifier tube of described transmitter unit on described pcb board, described negative temperature coefficient resister is connected to the input of described heat transfer temperature-control circuit, the output of described heat transfer temperature-control circuit is connected to the control end of described APC automated power control unit.
5. a kind of improved vehicle-carried intercom according to claim 1, is characterized in that: the LCD back lighting drive circuit in described display unit adopts constant-current drive circuit.
6. a kind of improved vehicle-carried intercom according to claim 1, is characterized in that: described power subsystem after two-stage voltage stabilizing for described microprocessor provides working power; And the voltage detecting input of described microprocessor is connected with voltage detecting circuit, the Energy control output of described microprocessor is connected with the switching circuit of the complete machine electric power loop being switched on or switched off described power subsystem.
7. a kind of improved vehicle-carried intercom according to claim 1, is characterized in that: the keyboard lockout switch of described hand miaow and DTMF locking switch all adopt mechanical switch and be all arranged at the front of described hand miaow.
8. a kind of improved vehicle-carried intercom according to claim 1, it is characterized in that: the PTT button of described hand miaow comprises PTT key shell and flexure strip, described PTT key shell has and stretches into the inner and fore-set of the emission switch of corresponding described hand miaow of described hand miaow, one end of described flexure strip is fixed in described hand miaow, and the other end is free end and correspondence is stretched between the emission switch of described fore-set and described hand miaow; Along the corresponding setting in edge with described pcb board corresponding site in one end of described PTT key shell, and leave the spacing gap controlling described PTT key shell pressing quantity between the two.
9. a kind of improved vehicle-carried intercom according to claim 8, is characterized in that: be folded with the spacing pad of elastic buffer between the interior edge of described PTT key shell and the respective side edge edge of described pcb board.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510647826.1A CN105227206B (en) | 2014-06-20 | 2014-06-20 | A kind of novel on-vehicle intercom |
| CN201410279177.XA CN104038248B (en) | 2014-06-20 | 2014-06-20 | A kind of improved vehicle-carried intercom |
| CN201510647990.2A CN105187081B (en) | 2014-06-20 | 2014-06-20 | A kind of Vehicular intercom |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410279177.XA CN104038248B (en) | 2014-06-20 | 2014-06-20 | A kind of improved vehicle-carried intercom |
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| CN201510647826.1A Division CN105227206B (en) | 2014-06-20 | 2014-06-20 | A kind of novel on-vehicle intercom |
| CN201510647990.2A Division CN105187081B (en) | 2014-06-20 | 2014-06-20 | A kind of Vehicular intercom |
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| CN104038248A CN104038248A (en) | 2014-09-10 |
| CN104038248B true CN104038248B (en) | 2016-01-20 |
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| CN201510647826.1A Active CN105227206B (en) | 2014-06-20 | 2014-06-20 | A kind of novel on-vehicle intercom |
| CN201510647990.2A Active CN105187081B (en) | 2014-06-20 | 2014-06-20 | A kind of Vehicular intercom |
| CN201410279177.XA Active CN104038248B (en) | 2014-06-20 | 2014-06-20 | A kind of improved vehicle-carried intercom |
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| CN201510647826.1A Active CN105227206B (en) | 2014-06-20 | 2014-06-20 | A kind of novel on-vehicle intercom |
| CN201510647990.2A Active CN105187081B (en) | 2014-06-20 | 2014-06-20 | A kind of Vehicular intercom |
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| CN105763218A (en) * | 2016-04-13 | 2016-07-13 | 国家电网公司 | DMR data signal transfer circuit |
| CN106027106A (en) * | 2016-07-26 | 2016-10-12 | 泉州易沃得电子科技有限公司 | TDMR high-frequency anti-explosion anti-interference portable interphone |
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| CN106972268A (en) * | 2017-03-30 | 2017-07-21 | 广东欧珀移动通信有限公司 | Circuit board assemblies and electronic equipment |
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| CN203406862U (en) * | 2013-06-28 | 2014-01-22 | 杜晓智 | Vehicular-locating set wireless talk-back device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104038248A (en) | 2014-09-10 |
| CN105227206A (en) | 2016-01-06 |
| CN105187081A (en) | 2015-12-23 |
| CN105187081B (en) | 2018-03-27 |
| CN105227206B (en) | 2018-03-27 |
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