CN204145476U - A kind of switching mode remote-control receiving circuit - Google Patents

Abstract

A kind of switching mode remote-control receiving circuit, belong to electronic technology field, by radio frequency reception demodulator circuit, escape circuit, interlock circuit, performance element, decoding block forms jointly, the output of radio frequency reception demodulator circuit connects the input of decoding block, decoding block has four outputs, connect with the input of escape circuit for become code control end, what connect with performance element is last output, all the other two export connection interlock circuit, wherein 6 connections of decoding code block 8 bit code position are fixed code, another two become variation code, in an initial condition, receive and transmit for the first time, become code control end and produce High voltage output, start escape circuit, form the conversion of two variation codes, receiving transmits for the second time just starts performance element, interlock circuit starts when receiving mistake and making multidigit output be high, locking executive circuit and escape circuit, form the uniqueness exported, can how several variation codes by the method for this measure, more be conducive to promoting the difficulty cracked.

Description

A kind of switching mode remote-control receiving circuit

Technical field

Belong to electronic technology field.

Background technology

Namely telecontrol engineering is far distance controlled technology, is divided into coding techniques and decoding technique, coding in coding techniques i.e. radiating circuit is integrated, coding techniques occupies very important position in remote control product, and its direct relation the superiority-inferiority of product, from present technical merit, present coding integrated circuit, be higher gears take rolling code as the kind of representative, the advantage of this adhesive integrated circuit is that coding is complicated, cracks difficulty, but price, technical difficulty is large simultaneously.Another kind of is the coding being encoded to three kinds of states, as 2262 with the coding integrated circuit kind of representative, this kind of integrated advantage is that price is low, so the product made has very large price competitiveness, wide market, but shortcoming due to simple close pole of encoding not high, so can not be widely used in the higher product of requirement.If change a kind of method of thinking, thorough change fixed code kind crack an edition ability, this possibility exists, the thinking of this innovation is exactly macroscopically from other side, increase the restriction requirement of launching and receiving, the existence that this restriction requires, certainly greatly can improve the ability of cracking, and restriction requires more, obviously cracks difficulty larger.Our unit once have developed the transmitting Decision Making of Line Schemes of multiple change code, increase the restraining factors of launching, thus launch a kind of code thread having multiple restraining factors, improve the level of confidentiality degree of coding to a great extent, but also need the receiving lines of decoding to coordinate with it, just can become a complete entirety, if receive the uniqueness accomplishing to export, validity sometimes, this extremely has meaning to lifting level of confidentiality degree, but such reception needs relevant technical support, so be in now in the middle of research.

Summary of the invention

Main purpose of the present utility model proposes to launch with single ripple dicode the change code receiving circuit matched, realize the reception that radiating portion sends twice change code, launch for research dicode and create better condition, four kinds of functions can be produced: one is the signal that can receive two kinds of codes after enforcement, two is receive to have sequential, first signal unique for the first time can only be received, then second time signal could be received, three is unique property with output, four is validity sometimes when receiving, owing to adding four kinds of important restrictions, so significantly increase the difficulty cracking decoding, improve the performance of remote control product all sidedly.

The measure that this patent proposes is:

1, a kind of switching mode remote-control receiving circuit is made up of jointly radio frequency reception demodulator circuit, escape circuit, interlock circuit, performance element, decoding block.

Wherein: the output of radio frequency reception demodulator circuit connects the input of decoding block, and decoding block has four output, connect with the input of escape circuit for become code control end, what connect with performance element is last output, all the other two output connection interlock circuits.

Wherein 6 connections of decoding code block 8 bit code position are fixed code, and another two become change code end, namely change code.

Escape circuit: become the control end connecting the first analog switch after code controls termination current-limiting resistance, the control end of the first analog switch is the input of escape circuit, the input termination power of the first analog switch, first variation code of the output termination decoding block of the first analog switch, first variation code connects an earth resistance to ground wire, the output of control termination first analog switch of the second analog switch, the input end grounding line of the second analog switch, the output termination second of the second analog switch changes code, and the second variation code connects a source resistance to power supply.

Performance element is made up of with executive circuit isolation resistance, isolation diac: one end of isolation resistance is connected last output, and the other end of isolation resistance is connected together with the positive pole of isolation diac, and the negative pole of isolation diac connects executive circuit.

The positive pole of performance element first locking diode connects the positive pole of isolation diac, and the negative pole of performance element first locking diode connects and becomes code control end.

Interlock circuit by or gate diode or gate resistor, triode, collector resistance, locking diode form:

3rd output exports with the 4th the positive pole meeting or gate diode respectively, or the negative pole of gate diode is connected together even or connects the base stage of triode after gate resistor, collector resistance is connected between the collector electrode of triode and power supply, the collector electrode of triode connects the negative pole of two locking diodes, the positive pole of a locking diode and performance element second locking diode connects the positive pole of isolation diac, and the positive pole of another locking diode and escape circuit locking diode connects the base stage of control valve.

2, decoding block used is transient state type.

3, analog switch is integrated circuit.

4, with escape circuit, 8 bit codes of decoding block are made variation code.

This measure is explained as follows further:

One, sketch the cardinal principle of single ripple dicode transmitting that our unit for the previous period develops: in 8 bit codes of coding integrated package, wherein 6 is fixed code, all the other two is variation code, when launching, launch two subcategory numbers.Transmitter code is 6 fixed code wherein for the first time, and the first subcategory number of the variation code of two, and the code that second time is launched is 6 constant fixed code, and the coded signal after the variation of two variation codes.And receive and also will receive twice signal, be once 6 fixed code and the first subcategory number of variation code, second time is the coded signal after 6 fixed code change with variation code.

In the utility model, one subcategory number of launching the first variation code is 0, code after first variation code variation is 1, one subcategory number of the second variation code is 1, second variation code variation after code be 0, so receive first variation code a subcategory number be 0, first variation code variation after code be 1, second variation code is once the code after the 1, second variation code variation is 0.

Two, 8 bit codes of decoding block variation code can be made with the escape circuit of this measure: often increase an analog switch and convert a bit code, also multi-position code can be controlled with an analog switch.In this measure, only control two bit codes.

In this measure 1, produce the line construction of twice decoding: corresponding with 8 bit code lines in decoding block and radiating portion integrated package of encoding.6 bit codes have wherein connected into fixed code (37 in Fig. 2).All the other two bit codes become the change code end of a kind of reception twice signal, and when initial condition, in receiving unit, the first variation code initial condition code bit that is a subcategory number presents is the stationary state of 0, second variation code initial condition is 1, and the first variation code just produced after receiving signal in decoding becomes 1, second, and to change code be the state of 0.Its decoding is integrated with four outputs, wherein first output connects with escape circuit, be and become code control, directly control to become code, the second output connects with performance element, is last output, direct output decoded result, 3rd and the 4th exports and is connected interlock circuit, produce multidigit when exporting, and directly locking becomes code and execution at garbled-reception or when cracking code bit.

Three, escape circuit realiration becomes the reason of code: when become code control end no-output into zero time, the control end no-voltage of the first analog switch, now the first analog switch is off state, it exports no-voltage, and the first variation code presents low level because there being earth resistance, i.e. 0 state, the control end of the second analog switch is connected in the output of the first analog switch, therefore the control end of the second analog switch also no-voltage, in disconnecting shape, but because the second variation code has connect source resistance, so what present is high-order, i.e. 1 state, output is had in time high-order when becoming code control end, first analog switch demand working, because input termination power supply, so it is high-order that the first change code end also equals to have connect power supply, i.e. 1 state, and second analog switch is because control end has had high pressure in connecting, but the input termination of the second analog switch ground wire, therefore second becomes code end and is also equal to and has connect ground wire, it is 0 state, thus form the conversion becoming code.

Four, this measure can produce four kinds of functions after implementing: one is to receive change coded signal, two is receive to have sequential, first signal unique for the first time can only be received, then second time signal could be received, three is unique property with output, four is validity sometimes when receiving, owing to adding four kinds of important restrictions, so significantly increase the difficulty having cracked and decoded.

1, the principle of two kinds of coded signals can be received:

(1), receive the first subcategory number of sending of radiating portion principle: as shown in Figure 2, in an initial condition, change code control end (7 in Fig. 2) Non voltage output of decoding block, the control end no-voltage of the first analog switch (28 in Fig. 2) is existed, its switch is in disconnecting shape, i.e. input also output open circuit, the first variation code that first analog switch connects is because connect earth resistance (29 in Fig. 2), so the first variation code presents is 0 state, and the control end of the second analog switch (30 in Fig. 2) is connected in the output of the first analog switch, so the second analog switch is also disconnect shape, but because the second variation code has connect source resistance (32 in Fig. 2), so the second variation code presents is 1 state, be consistent with the variation code of radiating portion, now not only can receive 6 fixed code, also a coded signal of variation code can be received.

(2), receive the second subcategory number of sending of radiating portion principle: after receiving the first signal sent, at this moment encode integrated circuit change code control end (7 in Fig. 2) export 1 signal, first analog switch is connected, its input also output is connected, due to the input termination power supply of the first analog switch, therefore the first variation code also equals to have connect power supply is 1 signal, the output of the first analog switch is in high-order, the second analog switch is caused also to be turned on by the disconnect, but the input of the second analog switch is earth connection, therefore the output of the second analog switch connect second variation code also for earth connection is 0 state.After changing with the variation code launched, code is identical, so can receive the different coded signal of second time.

The analog switch used in measure 1 is CD4066, and there are 4 independently analog switches inside, and the crosstalk of each switch room is very little, and representative value is-50dB.When control end adds high level, switch conduction, conduction impedance is lower, and in addition, conduction impedance is substantially constant in whole input reference signal.Eliminate the change of switching transistor threshold voltage with input signal, therefore within the scope of whole working signal, conduction impedance is lower.Compared with single channel switch, there is input signal peak voltage ranges and equal supply voltage and the advantage such as conduction impedance is more stable in input reference signal.The switch cut-off when control end adds low level.During bilateral analog switch conducting, conducting resistance is tens ohm; During analog switch cut-off, present very high impedance, can open circuit be become.Bilateral analog switch can transmission of digital signals and analog signal, and the upper limiting frequency of the analog signal that can transmit is 40MHz.

Analog switch is a kind of three-stable state circuit, and it according to the level of gating end, can determine the state of input end and output.When elected go side is in strobe state, the state of output depends on the state of input end; When elected go side is in cut-off state, then no matter input end's level how, output is all high-impedance state.Analog switch possess low in energy consumption, speed fast, mechanical contact, volume are little and the feature such as long service life.

2, receive the sequential that has that twice change code must have successively to limit and principle: because the first initial condition becoming code end of decoding block is 0, second initial condition becoming code end is 1, so the first variation code one subcategory number only having radiating portion to send is 0, when one subcategory number of the second variation code is 1, launching and receiving code could be corresponding, the last output of decoding block just has output, thus cause decoding block variation code just to have the new code of secondary, and this new code could coincide with transmitting, the last output making decoding block connect performance element just has high-order output.If launching what first send is quadratic code 1 signal of the first variation code, although the initial condition of the second variation code of decoding block is 1, but because code bit is different, therefore can not normally receive, and the first variation code of decoding block is also in 0 signal under initial condition, also cannot receive, so the last output connecting performance element does not have output.More than analyze, if cracker is first the second subcategory number crack code, but because the first subcategory number is not opened, becoming code control end is low level, and performance element first locking diode (18 in Fig. 2) works, to performance element clamper, only have after the first subcategory number is opened, could receive the second subcategory number, two subcategory numbers correctly just can have last output, namely the output of decoding block connection performance element has voltage, could start performance element.

3, there is the principle of benefit that bit line uniquely receives and formation: in this measure, add interlock function, its benefit is when criminal is when cracking, and the bit line determined is wrong, then therefore cannot crack completely without output.Its reason one only has to become code bit line correctly, and what second time just may be had to receive is correct, otherwise can not normal reception.Two is that the bit line only exported to rear class exports correctly, last output is just had when two subcategory numbers are correct, three is if when multidigit output has output or receives mistake simultaneously, because the base input end of triode becomes or door, form interlocking, as can be seen from Figure 2, the current collection very low level of triode, second clamp diode (16 in Fig. 2) of performance element, the clamp diode (17 in Fig. 2) of escape circuit work, formation performance element, escape circuit clamper carried out to performance element, escape circuit, so cannot start.

4, the principle of twice receiving code validity sometimes: be the transient state type selected because decoding integrated circuit exports, so criminal can not be allowed to crack the more time, also be that the first subcategory number cracks successfully, second subcategory number must provide in the very short time, otherwise invalid, must will restart two subcategory numbers.

After the invention process, after coordinating with the radiating portion applied for before our unit, below outstanding feature:

1, the character of coding integrated circuit is improved, realize the reception that radiating portion sends twice change code, just output is had after must receiving two subcategory numbers after receiving circuit decoding, thus there is the very high anti-ability of cracking, signal transmission is accurate, and keeping cheap advantage, the product making it make possesses the very large market competitiveness.

2, owing to increasing interlocking portions, this reception defines the function of quadruple constraint, substantially increases and cracks difficulty, but but can reliably receive.

If 3 with the combination again of rolling code circuit, it decodes difficulty is superpower, because rolling code is the coding of a class character, and in this measure, dicode transmitting is the coding of a class character, two kinds of coded combinations of different nature are larger than a kind of code breaks difficulty of character.

4, the dicode receiving lines of this measure receives reliable.

Its reason is that the decoding block fixed code in the present invention conforms to completely with the fixed code of radiating portion.Variation code is also also formulated according to the variation code launched, and have followed the rule of this kind of encoding and decoding block completely.Another very important reason is, what the decoding in receiving lines in the present invention realized is " tracking system ", that is to say that just automatically become the code needed for second time, twice receiving course is not disorderly, onside after receiving first change code.

5, crack very difficult: mainly contain three reasons, one is to have twice different code could realize decoding, just has output.Two is that different code needed for twice has timing requirements, can not be disorderly, 3rd major reason is, the requirement that this twice different change codes is also necessary free when launching, because the integrated output of the coding adopted in the present invention is the transient state output type adopted, in other words after receiving signal, its output can only remain a transient state high position, will disappear after blink.If criminal, after correct code is made in exploration in first time, want that within the very of short duration time, feel out the correct code of second time is more obviously very difficult.Also be that criminal wants to crack the present invention must by three passes: one is must twice different dicode, and two is also must have sequential, and three is also must be limited within the very short time just can complete, and therefore adopts " the barcode scanning instrument " of crime to crack and hardly may.From meaning in a certain respect, higher than rolling code, because crack rolling code in theory, there is certain probability in this level of confidentiality, and just this probability is very low, very low, and the present invention is because exist the above-mentioned three elements that crack, this crack probability just may be lower.

6, circuit is reliable, and one is that circuit is simplified.Two analog switches possess low in energy consumption, speed fast, mechanical contact, volume are little and the feature such as long service life.

7, produce easily, one be need not be valuable equipment and instrument, two is that technology is simple, and three are that circuit is simplified and component requirements used is low, so can produce very high first-pass yield, very applicable minuscule-type-enterprise produces.

8, can how several variation codes by the method for this measure, be more conducive to promoting the difficulty cracked.

Accompanying drawing explanation

Fig. 1 is a kind of total measure figure of switching mode remote-control receiving circuit.

In figure: 1, radio frequency reception demodulator circuit (as superregenerative reception demodulating unit, or beat reception demodulating unit); 2, decoding block; 3, interlock circuit; 4, the 4th of decoding block the export; 5, the 3rd of decoding block the export; 6, the last output of decoding block; 7, the change code control end of decoding block; 8, performance element; 9, escape circuit; 10, the first variation code; 11, the second variation code.

Fig. 2 is the practical circuit diagram of this measure relative section.

In figure: 1, radio frequency reception demodulator circuit (as superregenerative reception demodulating unit, or beat reception demodulating unit); 2, decoding block; 4, the 4th of decoding block the export; 5, the 3rd of decoding block the export; 6, the last output of decoding block; 7, the change code control end of decoding block; 10, the first variation code; 11, the second variation code; 12, the 4th export or gate diode; 13, the 3rd export or gate diode; 15, isolation resistance; 16, performance element second clamp diode; 17, the clamp diode of escape circuit; 18, the first clamp diode of performance element; 19, diac is isolated; 20, executive circuit; 22, current-limiting resistance; 25 or gate resistor; 26, collector resistance; 27, the triode in interlock circuit; 28, the first analog switch; 29, the first variation code earth resistance; 30 second variation codes; 32, the second variation code source resistance; 37, the fixed code of decoding block.

Embodiment

Fig. 1 and Fig. 2 describes the concrete a kind of mode implemented jointly.

1, select element: wherein decoding block selects 2272, face fit type diode all selected by all diodes, and analog switch is CD4066.

2, weld: weld by Fig. 2.

3, adjustment and detection:

(1), can the Function detection of automatic changing code bit line: when launching first time signal, can reliable reception: the change code control end surveying decoding block with universal instrument has high-order output.

(2), twice signal receiving function detects: after receiving the first signal, secondary signal of fasting ejection very much, at this moment the last output of decoding block has high-order output.Have voltage to export when having universal instrument to survey this, if when adopting oscilloscope, display screen has high-order reaction.

(3) Received signal strength whether sequential, is detected: last output universal instrument or oscilloscope being received decoding block, if first launch secondary signal, now the last output of decoding block is without high pressure, if there is high pressure, explanation analog switch damages, or the clamp diode of escape circuit connects instead.

(4) whether reliably interlock circuit, is detected: the positive pole surveying performance element diac with universal instrument, when multidigit output has output simultaneously, diac positive pole answers no-voltage, otherwise explanation or gate diode do not weld, or triode damages, or clamp diode is bad.

(5), detect whether decoding block is non-interlocking type: first output and second of universal instrument or oscilloscope being received decoding block exports to be observed, and after receiving signal, signal can disappear within the time of short duration, otherwise should change the model of decoding block.

Claims (4)

1. a switching mode remote-control receiving circuit, is characterized in that: be jointly made up of radio frequency reception demodulator circuit, escape circuit, interlock circuit, performance element, decoding block;

Wherein: the output of radio frequency reception demodulator circuit connects the input of decoding block, and decoding block has four output, connect with the input of escape circuit for become code control end, what connect with performance element is last output, all the other two output connection interlock circuits;

Wherein 6 connections of decoding code block 8 bit code position are fixed code, and another two become change code end, namely change code;

Escape circuit: become the control end connecting the first analog switch after code controls termination current-limiting resistance, the control end of the first analog switch is the input of escape circuit, the input termination power of the first analog switch, first variation code of the output termination decoding block of the first analog switch, first variation code connects an earth resistance to ground wire, the output of control termination first analog switch of the second analog switch, the input end grounding line of the second analog switch, the output termination second of the second analog switch changes code, and the second variation code connects a source resistance to power supply;

Performance element is made up of with executive circuit isolation resistance, isolation diac: one end of isolation resistance is connected last output, and the other end of isolation resistance is connected together with the positive pole of isolation diac, and the negative pole of isolation diac connects executive circuit;

The positive pole of performance element first locking diode connects the positive pole of isolation diac, and the negative pole of performance element first locking diode connects and becomes code control end;

Interlock circuit by or gate diode or gate resistor, triode, collector resistance, locking diode form:

3rd output exports with the 4th the positive pole meeting or gate diode respectively, or the negative pole of gate diode is connected together even or connects the base stage of triode after gate resistor, collector resistance is connected between the collector electrode of triode and power supply, the collector electrode of triode connects the negative pole of two locking diodes, the positive pole of a locking diode and performance element second locking diode connects the positive pole of isolation diac, and the positive pole of another locking diode and escape circuit locking diode connects the base stage of control valve.

2. a kind of switching mode remote-control receiving circuit according to claim 1, is characterized in that: decoding block used is transient state type.

3. a kind of switching mode remote-control receiving circuit according to claim 1, is characterized in that: analog switch is integrated circuit.

4. a kind of switching mode remote-control receiving circuit according to claim 1, is characterized in that: with escape circuit, 8 bit codes of decoding block are made variation code.