CN203352724U - SCART interface module level control circuit and audio/video device - Google Patents
SCART interface module level control circuit and audio/video device Download PDFInfo
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- CN203352724U CN203352724U CN2013203370618U CN201320337061U CN203352724U CN 203352724 U CN203352724 U CN 203352724U CN 2013203370618 U CN2013203370618 U CN 2013203370618U CN 201320337061 U CN201320337061 U CN 201320337061U CN 203352724 U CN203352724 U CN 203352724U
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Abstract
The utility model provides an SCART interface module level control circuit and an audio/video device. The circuit is connected between a main chip and at least an SCART interface module connected with the audio/video device, and is characterized in that the circuit comprises a switch square signal terminal, a boost module and a control module, wherein the switch square signal terminal is connected with the boost module and used for supplying the boost module with a boost drive; the boost module is used for boosting an input voltage of a first power supply according to the boost drive and supplying the SCART interface module with a drive voltage; and the control module is used for controlling level switching of the SCART interface module according to control signals of the main chip. With the SCART interface module level control circuit, the drive voltage required by the SCART interface module can be provided by a low-voltage power device, and the level switching of the SCART interface module by the control module is ensured.
Description
Technical field
The utility model relates to the video equipment field, relates in particular to a kind of SCART interface module level control circuit and audio & video equipment.
Background technology
SCART(Syndicat des Constructeursd'Appareils Radior é cepteurs et T é l é viseurs) interface is a kind of audio-video interface of special use, owing to thering is good versatility and transfer of data, be widely used in audio & video equipment, in audio & video equipments such as European Region television set, satellite set top boxs, require mandatory adoption SCART interface module.Standard SCART interface module consists of 21 pins, difference transmission of audio signal, vision signal, control signal, data-signal and ground wire, wherein the 8th pin is that function is selected pin, be used for controlling the aspect ration of SCART television set receiver, video and the AV/TV switching of television signal input, define high, medium and low three kinds of level, be used for switching different mode of operations.When function selects pin voltage to be 0-2V, be switched to the TV pattern, when function selects pin voltage to be 4.5-7V, be switched to AV aspect ration 16:9 pattern, when function selects pin voltage to be 9.5-12V, be switched to AV aspect ration 4:3 pattern, the audio & video equipment of employing SCART interface module must need to possess the handoff functionality of these three kinds of level.
From the above, the SCART function selector circuit adopts the input of 12V voltage, for the low voltage electric power system circuit, itself there is no the 12V voltage source, and needing provides the 12V voltage source to the SCART interface module separately, causes cost to increase.
Summary of the invention
In view of this, need to provide a kind of SCART interface module level control circuit and audio & video equipment, can provide the driving voltage of SCART interface module to low-tension supply equipment, realize that the level of SCART interface module is controlled.
The utility model provides a kind of SCART interface module level control circuit, is connected between the SCART interface module of master chip and at least one connection audio & video equipment, and this circuit comprises switching square wave signal end, boost module, control module;
Described switching square wave signal end, connect described boost module, for the driving of boosting of described boost module is provided;
Described boost module, for according to the described driving of boosting, the input voltage of the first power supply being boosted, provide the driving voltage of described SCART interface module;
Described control module, control the switching of described SCART interface module level for the control signal according to described master chip.
Preferably, described boost module comprises: the first diode, the second diode, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity;
The common port of described the first diode connects described switching square wave signal end by described the first electric capacity, and positive pole connects described the first power supply, reaches the negative pole that connects described the first diode by described the 3rd electric capacity, and negative pole connects the positive pole of described the second diode;
The common port of described the second diode connects described switching square wave signal end by described the second electric capacity, the anodal negative pole that connects described the first diode, and connects the negative pole of described the second diode by described the 4th electric capacity, and negative pole connects described control module.
Preferably, described control module comprises: the first triode, the second triode, the 3rd triode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance;
The base stage of described the first triode connects the first universal input of described master chip/output interface by described the first resistance, grounded emitter, and collector electrode connects described boost module by described the 3rd resistance, the 4th resistance of serial connection;
The base stage of described the second triode connects the second universal input of described master chip/output interface by described the second resistance, grounded emitter, collector electrode connect described the 3rd triode base stage, and described the 3rd resistance, the 4th resistance between;
The base stage of described the 3rd triode connects the collector electrode of described the second triode, and emitter connects described SCART interface module, and connects described boost module, grounded collector by described the 5th resistance.
Preferably, described boost module also comprises: the 6th resistance, the 5th electric capacity;
The negative pole of described the second diode is respectively by described the 6th resistance, described the 5th capacity earth.
Preferably, described the first diode, described the second diode adopt BAV99.
Preferably, the emitter of described the 3rd triode connects described SCART interface module and comprises: the emitter of described the 3rd triode connects described SCART interface module by described the 3rd diode.
Preferably, described SCART interface module level control circuit connects described SCART interface module, comprising: described boost module connect described SCART interface module in order to switch the signal switch terminal of described audio & video equipment signal input mode and display mode.
Preferably, the input voltage of described the first power supply is 5V, and described driving voltage is 12V, described switching square wave signal end input 5V square-wave signal.
The utility model also provides a kind of audio & video equipment, comprises master chip and at least one SCART interface module, is connected with the described SCART interface module of above-mentioned any one level control circuit between described master chip and described SCART interface module.
Due to this SCART interface module level control circuit and there is the audio & video equipment of this circuit, comprised boost module, realized that low-tension supply equipment provides required driving voltage to the SCART interface module, thereby guaranteed control module to the SCART interface module the level switching, solved the problem of the required driving voltage of low voltage electric power system SCART interface module with low cost.
The accompanying drawing explanation
The module diagram of a kind of SCART interface module level control circuit that Fig. 1 provides for the utility model embodiment;
A kind of SCART interface module level control circuit figure that Fig. 2 provides for the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Please refer to Fig. 1, the module diagram of a kind of SCART interface module level control circuit that Fig. 1 provides for the utility model embodiment.As shown in the figure, SCART interface module level control circuit 100, be connected in master chip 101 and and connect between the SCART interface module 102 of audio & video equipment, SCART interface module level control circuit 100 comprises switching square wave signal end 110, boost module 120, control module 130;
Switching square wave signal end 110, connect boost module 120, for the driving of boosting of boost module 120 is provided;
Because this SCART interface module level control circuit 100 has comprised boost module 120, realized that low-tension supply equipment provides required driving voltage to SCART interface module 102, thereby guaranteed the level switching of 130 pairs of SCART interface modules 102 of control module, with low cost, solved the problem that low voltage electric power system does not possess the required driving voltage of SCART interface module.
A kind of SCART interface module level control circuit figure that Fig. 2 provides for the utility model embodiment, as shown in the figure, SCART interface module level control circuit comprises: switching square wave signal end 210, boost module 220, control module 230;
Switching square wave signal end SW 210, connect boost module 220, for the driving of boosting of boost module 220 is provided;
Boost module 220, for according to boosting of switching square wave signal end SW 210, driving the input voltage of the first power supply is boosted, provide the driving voltage of SCART interface module;
In this embodiment, will with the SCART interface module in order to switch the signal switch terminal of audio & video equipment signal input mode and display mode, function selects pin SCART_FUNC to be illustrated.
Control module 230, control the switching of SCART interface module 102 level for the control signal according to master chip.
Input 5V square-wave signal illustrates as 5V, driving voltage as 12V, switching square wave signal end SW will to take the input voltage of the first power supply in this embodiment.
As preferred embodiment, further, boost module 220 comprises: diode D1, diode D2, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4.In this preferred embodiment, diode D1, D2 adopt BAV99 to be illustrated, and wherein, the common port 3 of diode D1 is by the first capacitor C 1 connecting valve square-wave signal end SW, positive pole 1 connects the first power supply 5V, reaches the negative pole that connects diode D1 by capacitor C 3, the positive pole of negative pole connection diode D2.The common port 3 of diode D2 is by capacitor C 2 connecting valve square-wave signal end SW, the negative pole of cathode connecting diode D1, and connects the negative pole of diode D2 by capacitor C 4, negative pole link control module 230.
Control module 230 comprises: triode Q1, triode Q2, triode Q3, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5.The base stage of triode Q1 connects the first universal input of master chip/output interface (General Purpose Input Output by resistance R 1, GPIO, below will adopt the GPIO1 statement), grounded emitter, collector electrode connects boost module 220 by resistance R 3, the resistance R 4 of serial connection.The base stage of triode Q2 connects the second universal input of master chips/output interface (following will adopt the GPIO2 statement) by resistance R 2, and grounded emitter, reaches between resistance R 3, resistance R 4 base stage of collector electrode connecting triode Q3.The collector electrode of the base stage connecting triode Q2 of triode Q3, emitter connects the function of SCART interface module and selects pin SCART_FUNC, reaches by resistance R 5 connection boost modules 220, grounded collector.
Further, the negative pole of diode D2 can pass through dummy resistance R6 shunt capacitance C4 ground connection, reaches filter effect.
In this preferred embodiment, the function that the emitter of triode Q3 connects the SCART interface module by diode D3 is selected pin SCART_FUNC, can effectively play the effect of reverse-filling voltage.
Below with reference to Fig. 2, principle of the present utility model is illustrated.
Boost module 220 adopts the input of 5V power supply, 5V switching square wave signal driver, and when the level of switching square wave signal is 0, the 5V input voltage charges to capacitor C 1 by the 1-3 pin of diode D1, and voltage when C1 is full of electricity is 5-V
fM, when the level of switching square wave signal rises to 5V by 0, the voltage of capacitor C 1 end is added 5V on original basis, is 10-V
fM, 10-V now
fM3-2 pin by diode D1 charges to capacitor C 3, and now the voltage of capacitor C 3 becomes 10-2V
fM, when next switching square wave signal level becomes 0 by 5V, the voltage of capacitor C 3 ends charges to C2 by the 1-3 pin of diode D2, because C3 voltage has risen to 10-3V
fM, the voltage after the C2 charging is 10-3V
fM, when the switching square wave level rises to 5V again by 0, the voltage of C2 end becomes 15-3V
fM, now the power supply of C2 end, by the 3-2 pin charging of diode D2, charges to 15-4V
fM, the pressure drop V of BAV99 diode
fMget 0.7V, so the voltage after boosting is 15-0.7*4=12.2V, can meet the power drives of SCART interface module.
Control module 230 is controlled triode Q1 by GPIO1, the GPIO2 of master chip, and the conducting of Q2 and cut-off realize that the function of SCART interface module selects three kinds of required level, and the voltage of hypothesis after boosting is VCC herein, realizes that principle is as follows:
The base stage that controls triode Q1 as master chip GPIO1 is that low, that GPIO2 controls triode Q2 base stage is also when low, triode Q1, Q2 all end, triode Q2 collector voltage is VCC, now triode Q3 also ends, the Q3 emitter voltage is VCC, the voltage of the now SCART_FUNC pin of SCART interface module output is between 9.5-12V, and the function of SCART interface module is chosen as AV 4:3 pattern.
The base stage that controls triode Q1 as master chip GPIO1 be high, that GPIO2 controls triode Q2 base stage when hanging down, triode Q2 cut-off, triode Q1 conducting, triode Q2 collector voltage is that VCC is VCC/2 through resistance R 3, resistance R 4 dividing potential drops, now triode Q3 conducting, the about 6V of triode Q3 collector voltage left and right, the voltage of the now SCART_FUNC pin of SCART interface module output is between 4.5-7V, and the function of SCART interface module is chosen as AV 16:9 pattern.
The base stage that controls triode Q2 as master chip GPIO2 is high, triode Q2 has been conducting to ground, now, the conducting of triode Q1 whether on the level of triode Q2 collector electrode without impact, because triode Q2 collector electrode level is 0, triode Q3 conducting, now triode Q3 collector voltage is 0.7V, the voltage of the now SCART_FUNC pin of SCART interface module output is between 0-2V, and the function of SCART interface module is chosen as the TV pattern.
Above-mentioned control logic is as shown in the table:
| GPIO1 | GPIO2 | SCART_FUNC pin voltage value (V) | Function is selected |
| L/H | H | 0-2.0 | The TV pattern |
| H | L | 4.5-7.0 | AV 16:9 pattern |
| L | L | 9.5-12.0 | AV 4:3 pattern |
By the way, realized that low-tension supply equipment provides required driving voltage to the SCART interface module, thereby guaranteed the level switching of control module to the SCART interface module, with low cost, solved the problem that low voltage electric power system does not possess SCART interface module required driving voltage.And in above-mentioned preferred embodiment; utilize discrete device to realize that the low-voltage input provides three required level of SCART interface module to control; with respect to common DC-DC scheme required device, reduce; there is cost advantage; and control module has comprised diode D3; function with reverse-filling voltage protection, dependable performance, workable.
The utility model also provides a kind of audio & video equipment, comprises master chip and at least one SCART interface module, is connected with above-mentioned any one SCART interface module level control circuit between master chip and SCART interface module.
Because its principle is consistent with above-mentioned SCART interface module level control circuit principle, do not repeat them here.
Be understandable that, this audio & video equipment includes but not limited to Set Top Box, all-in-one.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (9)
1. a SCART interface module level control circuit, be connected between the SCART interface module of master chip and at least one connection audio & video equipment, it is characterized in that, described circuit comprises switching square wave signal end, boost module, control module;
Described switching square wave signal end, connect described boost module, for the driving of boosting of described boost module is provided;
Described boost module, for according to the described driving of boosting, the input voltage of the first power supply being boosted, provide the driving voltage of described SCART interface module;
Described control module, control the switching of described SCART interface module level for the control signal according to described master chip.
2. circuit as claimed in claim 1, is characterized in that, described boost module comprises: the first diode, the second diode, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity;
The common port of described the first diode connects described switching square wave signal end by described the first electric capacity, and positive pole connects described the first power supply, reaches the negative pole that connects described the first diode by described the 3rd electric capacity, and negative pole connects the positive pole of described the second diode;
The common port of described the second diode connects described switching square wave signal end by described the second electric capacity, the anodal negative pole that connects described the first diode, and connects the negative pole of described the second diode by described the 4th electric capacity, and negative pole connects described control module.
3. circuit as claimed in claim 1, is characterized in that, described control module comprises: the first triode, the second triode, the 3rd triode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance;
The base stage of described the first triode connects the first universal input of described master chip/output interface by described the first resistance, grounded emitter, and collector electrode connects described boost module by described the 3rd resistance, the 4th resistance of serial connection;
The base stage of described the second triode connects the second universal input of described master chip/output interface by described the second resistance, grounded emitter, collector electrode connect described the 3rd triode base stage, and described the 3rd resistance, the 4th resistance between;
The base stage of described the 3rd triode connects the collector electrode of described the second triode, and emitter connects described SCART interface module, and connects described boost module, grounded collector by described the 5th resistance.
4. circuit as claimed in claim 2, is characterized in that, described boost module also comprises: the 6th resistance, the 5th electric capacity;
The negative pole of described the second diode is respectively by described the 6th resistance, described the 5th capacity earth.
5. circuit as claimed in claim 4, is characterized in that, described the first diode, described the second diode adopt BAV99.
6. circuit as claimed in claim 3, is characterized in that, the emitter of described the 3rd triode connects described SCART interface module and comprises: the emitter of described the 3rd triode connects described SCART interface module by the 3rd diode.
7. circuit as described as claim 1 to 6 any one, it is characterized in that, described SCART interface module level control circuit connects described SCART interface module, comprising: described boost module connect described SCART interface module in order to switch the signal switch terminal of described audio & video equipment signal input mode and display mode.
8. circuit as claimed in claim 7, is characterized in that, the input voltage of described the first power supply is 5V, and described driving voltage is 12V, described switching square wave signal end input 5V square-wave signal.
9. an audio & video equipment, comprise master chip and at least one SCART interface module, it is characterized in that, between described master chip and described SCART interface module, is connected with as the described SCART interface module of claim 1-8 any one level control circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203370618U CN203352724U (en) | 2013-06-13 | 2013-06-13 | SCART interface module level control circuit and audio/video device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203370618U CN203352724U (en) | 2013-06-13 | 2013-06-13 | SCART interface module level control circuit and audio/video device |
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| CN203352724U true CN203352724U (en) | 2013-12-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105635904A (en) * | 2014-11-24 | 2016-06-01 | 天地融科技股份有限公司 | Universal audio adaption apparatus and electronic devices |
| CN105704616A (en) * | 2014-11-24 | 2016-06-22 | 天地融科技股份有限公司 | Universal audio adaption device and electronic device |
-
2013
- 2013-06-13 CN CN2013203370618U patent/CN203352724U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105635904A (en) * | 2014-11-24 | 2016-06-01 | 天地融科技股份有限公司 | Universal audio adaption apparatus and electronic devices |
| CN105704616A (en) * | 2014-11-24 | 2016-06-22 | 天地融科技股份有限公司 | Universal audio adaption device and electronic device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131218 Termination date: 20150613 |
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| EXPY | Termination of patent right or utility model |