CN204719965U - A kind of USB turns 38kHz modulated infrared light communication interface circuit - Google Patents
A kind of USB turns 38kHz modulated infrared light communication interface circuit Download PDFInfo
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Abstract
The utility model relates to interface circuit design field, particularly relates to a kind of USB and turns 38kHz modulated infrared light communication interface circuit.Transmitting-receiving control module is increased between control chip and infrared receiving module, transmit pin and the Received signal strength pin of control chip are Low level effective, when be in transmit time, control chip provides high level to the input end of the first Sheffer stroke gate, then the output terminal of the first Sheffer stroke gate is low level, the output terminal of the first Sheffer stroke gate is connected with an input end of the second Sheffer stroke gate, another input end of second Sheffer stroke gate is connected with infrared receiving module, no matter infrared receiving module exports any signal, the output terminal of the second Sheffer stroke gate exports and is high level, then the Received signal strength pin of control chip is invalid, shielded signal receives, after having transmitted, the high level that control chip provides has been converted to low level, and now the Received signal strength pin of control chip is effectively, and start signal receives, thus realizes transmitting-receiving control.
Description
Technical field
The utility model relates to interface circuit design field, particularly relates to a kind of USB and turns 38kHz modulated infrared light communication interface circuit.
Background technology
Modulated infrared light communication interface is the universal data interface of multifunctional electric energy meter.USB turns 38kHz modulated infrared light communication interface, with the carrier frequency of 38kHz ± 1kHz, carry out carrier communication to the signal that speed is 1200BPS, is widely used in state's net and communicates with the intelligent electric meter of south net.
In traditional modulated infrared light communication interface, the square wave of 38kHz produces with single-chip microcomputer, or high-frequency crystal oscillator is produced by repeatedly frequency division.When adopting single-chip microcomputer, scheme implements more complicated, takies pcb board area large, also wants burning program, is subject to the EMC interference of environment for use, and with high costs.When adopting high-frequency crystal oscillator, frequency dividing circuit is complicated, and take pcb board area large, crystal oscillator is in use easily vibrated in addition falls damage.(this is all unsuitable for realizing in the communication head of industry spot small size)
In traditional modulated infrared light communication interface, if do not receive and dispatch control, when infrared signal is launched, receiving loop can indistinguishably receive together with the light signal returned by copy reading table itself sending out light signal, and upload to host computer by USB, then the analysis realized receiving data by host computer is extracted, and the modulated infrared light communication interface versatility realized like this is undesirable.But the transmitting-receiving control of photosignal is realized by single-chip microcomputer, need again software and hardware to coordinate, cost compare is high.
In addition, when single-chip microcomputer receives photosignal, because photosignal speed is fast, immediately cannot screens the signal rate sended over and make conversion again, correct response can only be made to single-rate signal, the application simultaneously meeting multiple different rates cannot be accomplished.
Utility model content
Technical problem to be solved in the utility model is: provide a kind of USB to turn 38kHz modulated infrared light communication interface circuit, adopts simple circuit structure, realizes transmitting-receiving and controls, be applicable in the communication head in little space, and have good versatility.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of USB turns 38kHz modulated infrared light communication interface circuit, comprises 38kHz carrier generating circuit, carrier modulation circuit, infrared transmission module, infrared receiving module, transmitting-receiving control module, control chip and USB interface;
Described 38kHz carrier generating circuit is connected with carrier modulation circuit;
Described control chip is respectively with carrier modulation circuit with receive and dispatch control module and be connected;
Described carrier modulation circuit is connected with infrared transmission module;
Described transmitting-receiving control module is connected with infrared receiving module;
Described transmitting-receiving control module comprises the first resistance, the second resistance, the first Sheffer stroke gate and the second Sheffer stroke gate;
One end of described first resistance is connected with control chip; The other end of described first resistance is connected with two input ends of the first Sheffer stroke gate respectively;
The output terminal of described first Sheffer stroke gate is connected with an input end of the second Sheffer stroke gate; Another input end of described second Sheffer stroke gate is connected with infrared receiving module;
The output terminal of described second Sheffer stroke gate is connected with control chip by the second resistance;
Described control chip is connected with USB interface.
The beneficial effects of the utility model are: between control chip and infrared receiving module, increase transmitting-receiving control module, transmit pin and the Received signal strength pin of described control chip are Low level effective, when be in transmit time, control chip provides high level to the input end of the first Sheffer stroke gate, now the output terminal of the first Sheffer stroke gate is low level, the output terminal of the first Sheffer stroke gate is connected with an input end of the second Sheffer stroke gate, another input end of second Sheffer stroke gate is connected with infrared receiving module, no matter infrared receiving module exports any signal, the output terminal of the second Sheffer stroke gate exports and is high level, now the Received signal strength pin of control chip is invalid, shielded signal receives, after having transmitted, the high level that control chip provides has been converted to low level, and now the Received signal strength pin of control chip is effectively, and namely start signal receives, thus realizes transmitting-receiving control.The transmitting-receiving control module that the utility model provides only adopts two Sheffer stroke gates and two resistance just can realize transmitting-receiving and controls, and circuit structure is simple, low cost.
Accompanying drawing explanation
Fig. 1 is the structured flowchart that a kind of USB of the utility model embodiment turns 38kHz modulated infrared light communication interface circuit;
Fig. 2 is the circuit connection diagram that a kind of USB of the utility model embodiment turns 38kHz modulated infrared light communication interface circuit;
Label declaration:
10,38kHz carrier generating circuit; 20, carrier modulation circuit; 30, infrared transmission module; 40, infrared receiving module; 50, control module is received and dispatched; 60, control chip; 70, USB interface.
Embodiment
By describing technology contents of the present utility model in detail, realized object and effect, accompanying drawing is coordinated to be explained below in conjunction with embodiment.
The design of the utility model most critical is: between control chip and infrared receiving module, increase transmitting-receiving control module, adopt two Sheffer stroke gates and two resistance, realizes transmitting-receiving and controls.
Please refer to Fig. 1-2, a kind of USB that the utility model provides turns 38kHz modulated infrared light communication interface circuit, comprises 38kHz carrier generating circuit 10, carrier modulation circuit 20, infrared transmission module 30, infrared receiving module 40, transmitting-receiving control module 50, control chip 60 and USB interface 70;
Described 38kHz carrier generating circuit 10 is connected with carrier modulation circuit 20;
Described control chip 60 is respectively with carrier modulation circuit 20 with receive and dispatch control module 50 and be connected;
Described carrier modulation circuit 20 is connected with infrared transmission module 30;
Described transmitting-receiving control module 50 is connected with infrared receiving module 40;
Described transmitting-receiving control module 50 comprises the first resistance (R7 in Fig. 2), the second resistance (R8 in Fig. 2), the first Sheffer stroke gate (U2D in Fig. 2) and the second Sheffer stroke gate (U2A in Fig. 2);
One end of described first resistance is connected with control chip (the U1 CP2104 in Fig. 2); The other end of described first resistance is connected with two input ends of the first Sheffer stroke gate respectively;
The output terminal of described first Sheffer stroke gate is connected with an input end of the second Sheffer stroke gate; Another input end of described second Sheffer stroke gate is connected with infrared receiving module;
The output terminal of described second Sheffer stroke gate is connected with control chip by the second resistance;
Described control chip 60 is connected with USB interface 70 (J1 in Fig. 2).
From foregoing description, the beneficial effects of the utility model are: between control chip and infrared receiving module, increase transmitting-receiving control module, transmit pin and the Received signal strength pin of described control chip are Low level effective, when be in transmit time, control chip provides high level to the input end of the first Sheffer stroke gate, now the output terminal of the first Sheffer stroke gate is low level, the output terminal of the first Sheffer stroke gate is connected with an input end of the second Sheffer stroke gate, another input end of second Sheffer stroke gate is connected with infrared receiving module, no matter infrared receiving module exports any signal, the output terminal of the second Sheffer stroke gate exports and is high level, now the Received signal strength pin of control chip is invalid, shielded signal receives, after having transmitted, the high level that control chip provides has been converted to low level, and now the Received signal strength pin of control chip is effectively, and namely start signal receives, thus realizes transmitting-receiving control.
The transmitting-receiving control module that the utility model provides only adopts two Sheffer stroke gates and two resistance just can realize transmitting-receiving and controls, and circuit structure is simple, low cost.
Further, described 38kHz carrier generating circuit comprises LMC555 clock chip (the U3 LMC555 in Fig. 2), the 3rd resistance (R1 in Fig. 2), the 4th resistance (R2 in Fig. 2), the first diode (the D1 LL4148 in Fig. 2), the second diode (the D2 LL4148 in Fig. 2), the first electric capacity (C5 in Fig. 2), the second electric capacity (C6 in Fig. 2) and the 3rd electric capacity (C7 in Fig. 2);
Described LMC555 clock chip comprises grounding pin (the 1st pin of U3), trigger pin (the 2nd pin of U3), output pin (the 3rd pin of U3), reset pin (the 4th pin of U3), control voltage pin (the 5th pin of U3), thresholding pin (the 6th pin of U3), electric discharge pin (the 7th pin of U3) and power pins (the 8th pin of U3);
Described grounding pin ground connection;
Described thresholding pin is by the first capacity earth;
Described control voltage pin is by the second capacity earth;
Described trigger pin is connected with the negative pole of the first diode, the positive pole of the second diode and thresholding pin respectively;
Described electric discharge pin is connected with one end of the positive pole of the first diode, one end of the 3rd resistance and the 4th resistance respectively;
The other end of described 4th resistance is connected with the negative pole of the second diode;
Another termination power of described 3rd resistance;
Described reset pin is connected with power pins; Described reset pin connects power supply; Described power pins is by the 3rd capacity earth;
Described output pin is connected with carrier modulation circuit.
Seen from the above description, U3 is the LMC555 chip of TI company: clock generator.By arranging R1, R2, D1, D2, C5, C6, C7 parameter, the output pin of clock generator is made to export the square-wave signal of 38kHz, LMC555 chip has the advantages such as ease for use, cheap price and good reliability, is still widely used in so far in the design of electronic circuit.
Further, described carrier modulation circuit comprises the 5th resistance (R9 in Fig. 2), the 3rd Sheffer stroke gate (U2B in Fig. 2) and the 4th Sheffer stroke gate (U2C in Fig. 2);
One end of described 5th resistance is connected with control chip, and the other end of described 5th resistance is connected with two input ends of the 3rd Sheffer stroke gate respectively;
The output terminal of described 3rd Sheffer stroke gate is connected with an input end of the 4th Sheffer stroke gate;
Described " described output pin is connected with carrier modulation circuit " is specially: the output pin of described LMC555 clock chip is connected with another input end of the 4th Sheffer stroke gate;
The output terminal of described 4th Sheffer stroke gate is connected with infrared transmission module.
Seen from the above description, only use two Sheffer stroke gates and a resistance to realize carrier modulation, circuit structure is simple.
Further, described infrared transmission module comprises the 6th resistance (R3 in Fig. 2), the 7th resistance (R4 in Fig. 2), the 8th resistance (R5 in Fig. 2), light emitting diode (the TX AT205 in Fig. 2) and triode (the Q1 LMBT3906LT1 in Fig. 2);
Described " output terminal of described 4th Sheffer stroke gate is connected with infrared transmission module " is specially: the output terminal of described 4th Sheffer stroke gate is connected with one end of the 6th resistance;
The other end of described 6th resistance is connected with one end of the 7th resistance and the base stage of triode respectively;
Another termination power of described 7th resistance;
The emitter of described triode connects power supply;
The collector of described triode is connected with the positive pole of light emitting diode;
The negative pole of described light emitting diode is by the 8th resistance eutral grounding.
Seen from the above description, launched by the signal after carrier modulation by R3, R4, R5, Q1, TX with the form of infrared light, realize infrared emission function, adopt universal elements, circuit structure is simple.
Further, described infrared receiving module comprises infrared remote receiver (RX in Fig. 2), the 9th resistance (R6 in Fig. 2), the 4th electric capacity (C8 in Fig. 2), the 5th electric capacity (C9 in Fig. 2) and the 5th Sheffer stroke gate (U4 in Fig. 2);
Described infrared remote receiver comprises output pin (the 1st pin of RX), grounding pin (the 2nd pin of RX) and power pins (the 3rd pin of RX);
The output pin of described infrared remote receiver is connected with an input end of the 5th Sheffer stroke gate;
Another input end of described 5th Sheffer stroke gate connects power supply by the 9th resistance;
Two input ends of described 5th Sheffer stroke gate are connected;
The grounding pin ground connection of described infrared remote receiver;
The power pins of described infrared remote receiver is connected with one end of power supply, the 4th electric capacity and one end of the 5th electric capacity respectively;
The other end ground connection of described 4th electric capacity; The other end ground connection of described 5th electric capacity;
Described " another input end of described second Sheffer stroke gate is connected with infrared receiving module " is specially: another input end of described second Sheffer stroke gate is connected with the output terminal of the 5th Sheffer stroke gate.
Seen from the above description, C8, C9 provide filtering and energy storage effect for RX infrared remote receiver, make it power supply and keep stable.The 38kHz infrared signal received is demodulated into general T TL level signal by RX.
The parameter of main components is as shown in table 1:
| Components and parts | Parameter | Components and parts | Parameter |
| R1 | 1.2KΩ | R2 | 1.2KΩ |
| R3 | 1.2KΩ | R4 | 10KΩ |
| R5 | 20Ω | R6 | 51Ω |
| R7 | 100Ω | R8 | 100Ω |
| R9 | 100Ω | C1 | 10μF |
| C2 | 0.1μF | C3 | 10μF |
| C4 | 4.7μF | C5 | 0.01μF |
| C6 | 0.1μF | C7 | 0.1μF |
| C8 | 0.1μF | C9 | 10μF |
| U1 | Model C P2104 | U2(A\B\C\D) | Model 74HC04 |
| U3 | Model LMC555 | U4 | Model 74HC04 |
Table 1
In the present embodiment, J1 is standard USB-A interface, provides standard access port for being connected with computing machine.
U1 is the CP2104 chip of SILICON ALBS company: USB turns UART bridge, can realize the conversion of level with minimum encapsulated space (4*4MM QFN), simultaneously with internal programmable space, can realize multiple dexterity application.
As Fig. 2 circuit connecting mode, C1, C2 realize filtering USB being inputted to 5V power supply, and C3 provides filtering, C4 enable U1 chip programming interface for U1 chip internal digital power.U1 chip signal output, only gets TX and RX as the transmission signal of infrared signal and Received signal strength.Wherein, the GPI02 pin of U1 chip, by inside programming, achieves a butt joint and regains the control on road.
U3 is the LMC555 chip of TI company: clock generator.By arranging R1, R2, D1, D2, C5, make it to export the square wave for 38kHz.
That is come by U1 conversion is transmitted, and low level is effective signal radiated.Transmit by U2B (Sheffer stroke gate) negate, then carry out carrier modulation by U2C (Sheffer stroke gate) with 38kHz square wave, finally export to infrared transmission module.Signal after carrier modulation is launched with the form of infrared light by R3, R4, R5, Q1, TX.
C8, C9 provide filtering and energy storage effect for RX infrared remote receiver, make it power supply and keep stable.The 38kHz infrared signal received is demodulated into general T TL level signal by RX.This signal sends to U1 to carry out level conversion, finally beams back computing machine with differential signal by USB interface after carrying out reception control by U4, U2D (Sheffer stroke gate), U2A (Sheffer stroke gate).
During RX Received signal strength, can indistinguishably the signal that itself sends also be received.So just there is internal loopback phenomenon.If upper computer software does not do respective handling, this system is cisco unity malfunction.Therefore this signal own will shield by this circuit, could realize the versatility of hardware.This chip of CP2104 can realize simple programming.By it is set to 485 patterns, realizes GPIO2 mouth and uprise level when transmitting, after having transmitted, at once it is become low level.The change of this level, by U2D (Sheffer stroke gate) negate, then realizes, when launching infrared signal, turning off receiving cable by U2A (Sheffer stroke gate); When launching infrared signal and completing, open receiving cable, realize the shielding that itself is transmitted.
Because CP2104 is immediately be converted to Transistor-Transistor Logic level to the signal that USB sends, can be considered transparent transmission, therefore it can process different rates signal, meets the communication of multiple speed, improves the logical property done of product.
The utility model, with simple circuit, few device, achieves the transmission-receiving function of 38kHz modulated red external signal.Its reliability is high, highly versatile, can adapt to the transmitting-receiving of multiple speed, can complete the design of hardware and circuit structure, be convenient for carrying and engineer applied with very low cost and very little volume.
In sum, a kind of USB that the utility model provides turns 38kHz modulated infrared light communication interface circuit, transmitting-receiving control module is increased between control chip and infrared receiving module, transmit pin and the Received signal strength pin of described control chip are Low level effective, when be in transmit time, control chip provides high level to the input end of the first Sheffer stroke gate, now the output terminal of the first Sheffer stroke gate is low level, the output terminal of the first Sheffer stroke gate is connected with an input end of the second Sheffer stroke gate, another input end of second Sheffer stroke gate is connected with infrared receiving module, no matter infrared receiving module exports any signal, the output terminal of the second Sheffer stroke gate exports and is high level, now the Received signal strength pin of control chip is invalid, shielded signal receives, after having transmitted, the high level that control chip provides has been converted to low level, and now the Received signal strength pin of control chip is effectively, and namely start signal receives, thus realizes transmitting-receiving control.
The transmitting-receiving control module that the utility model provides only adopts two Sheffer stroke gates and two resistance just can realize transmitting-receiving and controls, and circuit structure is simple, low cost.Because CP2104 is immediately be converted to Transistor-Transistor Logic level to the signal that USB sends, can be considered transparent transmission, therefore it can process different rates signal, meets the communication of multiple speed, improves the logical property done of product.
The foregoing is only embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every equivalents utilizing the utility model instructions and accompanying drawing content to do; or be directly or indirectly used in relevant technical field, be all in like manner included in scope of patent protection of the present utility model.
Claims (5)
1. USB turns a 38kHz modulated infrared light communication interface circuit, it is characterized in that, comprises 38kHz carrier generating circuit, carrier modulation circuit, infrared transmission module, infrared receiving module, transmitting-receiving control module, control chip and USB interface;
Described 38kHz carrier generating circuit is connected with carrier modulation circuit;
Described control chip is respectively with carrier modulation circuit with receive and dispatch control module and be connected;
Described carrier modulation circuit is connected with infrared transmission module;
Described transmitting-receiving control module is connected with infrared receiving module;
Described transmitting-receiving control module comprises the first resistance, the second resistance, the first Sheffer stroke gate and the second Sheffer stroke gate;
One end of described first resistance is connected with control chip; The other end of described first resistance is connected with two input ends of the first Sheffer stroke gate respectively;
The output terminal of described first Sheffer stroke gate is connected with an input end of the second Sheffer stroke gate; Another input end of described second Sheffer stroke gate is connected with infrared receiving module;
The output terminal of described second Sheffer stroke gate is connected with control chip by the second resistance;
Described control chip is connected with USB interface.
2. a kind of USB according to claim 1 turns 38kHz modulated infrared light communication interface circuit, it is characterized in that, described 38kHz carrier generating circuit comprises LMC555 clock chip, the 3rd resistance, the 4th resistance, the first diode, the second diode, the first electric capacity, the second electric capacity and the 3rd electric capacity;
Described LMC555 clock chip comprises grounding pin, trigger pin, output pin, reset pin, control voltage pin, thresholding pin, electric discharge pin and power pins;
Described grounding pin ground connection;
Described thresholding pin is by the first capacity earth;
Described control voltage pin is by the second capacity earth;
Described trigger pin is connected with the negative pole of the first diode, the positive pole of the second diode and thresholding pin respectively;
Described electric discharge pin is connected with one end of the positive pole of the first diode, one end of the 3rd resistance and the 4th resistance respectively;
The other end of described 4th resistance is connected with the negative pole of the second diode;
Another termination power of described 3rd resistance;
Described reset pin is connected with power pins; Described reset pin connects power supply; Described power pins is by the 3rd capacity earth;
Described output pin is connected with carrier modulation circuit.
3. a kind of USB according to claim 2 turns 38kHz modulated infrared light communication interface circuit, it is characterized in that, described carrier modulation circuit comprises the 5th resistance, the 3rd Sheffer stroke gate and the 4th Sheffer stroke gate;
One end of described 5th resistance is connected with control chip, and the other end of described 5th resistance is connected with two input ends of the 3rd Sheffer stroke gate respectively;
The output terminal of described 3rd Sheffer stroke gate is connected with an input end of the 4th Sheffer stroke gate;
The structure that output pin is connected with carrier modulation circuit is specially: the output pin of described LMC555 clock chip is connected with another input end of the 4th Sheffer stroke gate;
The output terminal of described 4th Sheffer stroke gate is connected with infrared transmission module.
4. a kind of USB according to claim 3 turns 38kHz modulated infrared light communication interface circuit, it is characterized in that, described infrared transmission module comprises the 6th resistance, the 7th resistance, the 8th resistance, light emitting diode and triode;
The structure that the output terminal of the 4th Sheffer stroke gate is connected with infrared transmission module is specially: the output terminal of described 4th Sheffer stroke gate is connected with one end of the 6th resistance;
The other end of described 6th resistance is connected with one end of the 7th resistance and the base stage of triode respectively;
Another termination power of described 7th resistance;
The emitter of described triode connects power supply;
The collector of described triode is connected with the positive pole of light emitting diode;
The negative pole of described light emitting diode is by the 8th resistance eutral grounding.
5. a kind of USB according to claim 1 turns 38kHz modulated infrared light communication interface circuit, it is characterized in that, described infrared receiving module comprises infrared remote receiver, the 9th resistance, the 4th electric capacity, the 5th electric capacity and the 5th Sheffer stroke gate;
Described infrared remote receiver comprises output pin, grounding pin and power pins;
The output pin of described infrared remote receiver is connected with an input end of the 5th Sheffer stroke gate;
Another input end of described 5th Sheffer stroke gate connects power supply by the 9th resistance;
Two input ends of described 5th Sheffer stroke gate are connected;
The grounding pin ground connection of described infrared remote receiver;
The power pins of described infrared remote receiver is connected with one end of power supply, the 4th electric capacity and one end of the 5th electric capacity respectively;
The other end ground connection of described 4th electric capacity; The other end ground connection of described 5th electric capacity;
The structure that another input end of second Sheffer stroke gate is connected with infrared receiving module is specially: another input end of described second Sheffer stroke gate is connected with the output terminal of the 5th Sheffer stroke gate.
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| CN201520433606.4U CN204719965U (en) | 2015-06-23 | 2015-06-23 | A kind of USB turns 38kHz modulated infrared light communication interface circuit |
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| CN201520433606.4U CN204719965U (en) | 2015-06-23 | 2015-06-23 | A kind of USB turns 38kHz modulated infrared light communication interface circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106357342A (en) * | 2016-10-28 | 2017-01-25 | 成都力雅信息技术有限公司 | Data transmission device for bulk commodity transaction system |
| CN108877185A (en) * | 2018-08-24 | 2018-11-23 | 深圳和而泰小家电智能科技有限公司 | A bluetooth remote control method and circuit |
-
2015
- 2015-06-23 CN CN201520433606.4U patent/CN204719965U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106357342A (en) * | 2016-10-28 | 2017-01-25 | 成都力雅信息技术有限公司 | Data transmission device for bulk commodity transaction system |
| CN108877185A (en) * | 2018-08-24 | 2018-11-23 | 深圳和而泰小家电智能科技有限公司 | A bluetooth remote control method and circuit |
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Address after: 518000 Guangdong City, Nanshan District province high tech District, Southern District, software base, building 8, block A, floor 1, 9 Patentee after: Galaxy Power Group Co., Ltd Address before: Nanshan District Keyuan Road Shenzhen city Guangdong province 518000 No. 6 Science Park Arts crafts emporium room 701 Patentee before: Shenzhen Inhemeter Co., Ltd. |
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