CN101923769B - Remote control receiving circuit - Google Patents
Remote control receiving circuit Download PDFInfo
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- CN101923769B CN101923769B CN2009101080835A CN200910108083A CN101923769B CN 101923769 B CN101923769 B CN 101923769B CN 2009101080835 A CN2009101080835 A CN 2009101080835A CN 200910108083 A CN200910108083 A CN 200910108083A CN 101923769 B CN101923769 B CN 101923769B
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Abstract
The invention relates to a remote control receiving circuit. The remote control receiving circuit comprises a decoding circuit, a turning circuit and a switch drive circuit which are sequentially connected and also comprises a differential circuit which is connected between the decoding circuit and the turning circuit, wherein the differential circuit comprises a first capacitor and a first resistor; a capacitance value of the first capacitor is C, and a resistance value of the first resistor is R; one end of the first capacitor is connected with one end of the first resistor, and the other end of the first resistor is grounded; the other end of the first capacitor is connected with the decoding circuit, and an intersection of the first capacitor and the first resistor is connected with the turning circuit; and a time constant R*C of the differential circuit is larger than low-level interference time. By using the technical scheme of the invention, after the differential circuit is added into the remote control receiving circuit, an interference pulse signal of a coding circuit, which is generated by low-level interference when the signal is emitted, can be removed, the switch circuit has no malfunction and the stability of the remote control receiving circuit is improved.
Description
Technical field
The present invention relates to the electrical control field, more particularly, relate to a kind of remote-control receiving circuit.
Background technology
PT2262 and PT2272 are the general coding-decoding circuits of low-power consumption low price that a kind of CMOS technology is made.The coded signal that coding chip PT2262 sends by: address code, numeric data code, synchronous code are formed a complete code word, and the address code of setting and numeric data code are exported from 17 pin serials, can be used for the wireless remote control radiating circuit.After decoding chip PT2272 receives signal; After its address code was relatively checked through twice, the VT pin was just exported high level, and meanwhile corresponding data pin is also exported high level; If transmitting terminal presses & hold always; Its 17th pin is exported modulated serial data signal, and when 17 pin are the high frequency transmission circuit starting of oscillation of 315MHz between high period and launch the constant amplitude high-frequency signal, coding chip also can be launched continuously.When transmitter did not have button to press, PT2262 disconnected power supply, and its 17 pin is a low level, so the high frequency transmission circuit of 315MHz is not worked.
For remote control equipment, electromagnetic interference (EMI) is inevitable thing, normal generation misoperation under disturbing.For example, do not discharge (long by situation) if press the back at button, coding circuit always can transmit data frames; And decoding circuit has only and after receiving the proper data frame, just can keep high level always, and during this period, if certain Frame that coding circuit sends is disturbed; Decoding circuit is confiscated Frame and is thought that then button discharges; Output low level, and this moment, frame emission also sent, and after decoding circuit is received signal frame once more again, came back to high level; Therefore decoding circuit responds button twice, thereby causes misoperation to cause the flicker of lamp.
Summary of the invention
The technical matters that the present invention will solve is, can not eliminate interference to the above-mentioned remote-control receiving circuit of prior art, is prone to produce the defective of misoperation, and a kind of stable, jamproof remote-control receiving circuit is provided.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of remote-control receiving circuit; Comprise the decoding circuit, reverse circuit and the switch driving circuit that connect successively, also comprise the differentiating circuit (200) that is connected between said decoding circuit (100) and the said reverse circuit (300);
Said differentiating circuit (200) comprises first electric capacity and first resistance; The capacitance of said first electric capacity is C; The resistance of said first resistance is R, and an end of said first electric capacity connects an end of said first resistance, the other end ground connection of said first resistance; Another termination decoding circuit (100) of said first electric capacity, said first electric capacity is connected reverse circuit (300) with the joint of said first resistance;
The time that the time constant R of said differentiating circuit * C disturbs greater than low level.
In remote-control receiving circuit of the present invention, said differentiating circuit also comprises second resistance, and said second resistance is connected between said joint and the said reverse circuit.
In remote-control receiving circuit of the present invention, said differentiating circuit also comprises diode, and the positive pole of said diode connects said decoding circuit, and the negative pole of said diode connects the said first electric capacity other end.
In remote-control receiving circuit of the present invention, said differentiating circuit also comprises the negative pole that is connected said diode and the 3rd resistance between the ground.
In remote-control receiving circuit of the present invention, said decoding circuit comprises the integrated chip of model PT2272-M4; Said reverse circuit is a d type flip flop; Said switch driving circuit is metal-oxide-semiconductor or optocoupler.
In remote-control receiving circuit of the present invention, said d type flip flop is a double D trigger, and the quantity of said double D trigger is at least 1/2nd of load circuit quantity.
In remote-control receiving circuit of the present invention; Said switch driving circuit comprises triode, relay coil and relay switch; The base stage of said triode connects the signal output part of reverse circuit, its grounded emitter, an end of its collector connection relay coil; Another termination high level of said relay coil, said relay switch is connected in the load circuit.
In remote-control receiving circuit of the present invention, also comprise direct current regulation circuit, said direct current regulation circuit is decoding circuit, reverse circuit, switch driving circuit power supply.
The present invention also constructs a kind of remote-control receiving circuit, comprises decoding circuit, reverse circuit and switch driving circuit, and said decoding circuit is used for the receiving key control signal, and converts switch controlling signal into pulse triggering signal; Reverse circuit is used for converting said pulse triggering signal into drive signal; Switch driving circuit is used for the break-make according to said drive signal control load, also comprises differentiating circuit, and said differentiating circuit is used to remove the disturbing pulse trigger pip that low level undesired signal that said decoding circuit receives is generated.
In remote-control receiving circuit of the present invention, also comprise direct current regulation circuit, said direct current regulation circuit comprises reduction voltage circuit, rectification circuit and mu balanced circuit;
Said reduction voltage circuit is used for converting the High Level AC Voltage of input into low-voltage AC;
Said rectification circuit is used for converting the low-voltage AC of input into low-voltage DC;
Said mu balanced circuit is used to export DC voltage-stabilizing;
Said DC voltage-stabilizing electricity is used to decoding circuit, reverse circuit, switch driving circuit power supply
The technical scheme of embodiment of the present invention; After in remote-control receiving circuit, adding differentiating circuit; The high level saltus step that utilizes differentiating circuit only to extract coding circuit, differentiating circuit output low level then when coding circuit is kept high level always is when the of short duration low level of coding circuit output is disturbed; Differentiating circuit absorbs this interference through capacitance discharges; Therefore can remove coding circuit low level when transmitting and disturb the disturbing pulse signal that is produced, guarantee that on-off circuit can misoperation, improve remote-control receiving circuit stability.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the logic diagram of remote-control receiving circuit preferred embodiment of the present invention;
Fig. 2 is the circuit diagram of remote-control receiving circuit preferred embodiment of the present invention;
Fig. 3 (A) is the waveform synoptic diagram that undesired signal appears when transmitting in coding circuit;
The waveform synoptic diagram of undesired signal appears in Fig. 3 (B) when being decoding circuit reception signal;
Fig. 4 (A) is the waveform synoptic diagram of differentiating circuit input voltage;
Fig. 4 (B) is the waveform synoptic diagram of the differentiating circuit output voltage corresponding with Fig. 4 (A);
Fig. 5 (A) be differentiating circuit occur undesired signal 1,1 ' the input voltage waveform synoptic diagram;
Fig. 5 (B) the corresponding differentiating circuit output voltage waveforms synoptic diagram of undesired signal 1 occurs with Fig. 5 (A);
Fig. 5 (C) undesired signal 1 ' corresponding differentiating circuit output voltage waveforms synoptic diagram occurs with Fig. 5 (A).
Embodiment
Fig. 1 shows the logic diagram of remote-control receiving circuit preferred embodiment of the present invention; This circuit comprises decoding circuit 100, differentiating circuit 200, reverse circuit 300, switch driving circuit 400 and direct current regulation circuit 500; Decoding circuit 100 is used for the switch controlling signal of received code circuit (not shown), and converts switch controlling signal into pulse triggering signal; Differentiating circuit 200 is used to remove low level and disturbs the disturbing pulse signal that is produced; Pulse triggering signal after reverse circuit 300 will go to disturb converts drive signal into, and switch driving circuit 400 is used for the break-make according to said drive signal control load; Direct current regulation circuit 500 is used to decoding circuit 100, reverse circuit 300 and switch driving circuit 400 WV is provided.
Fig. 2 is the circuit diagram of remote-control receiving circuit shown in Figure 1.Load can be electric light, fan (not shown), in the present embodiment, 4 load branch is arranged.
1, decoding circuit
In the present embodiment, decoding circuit is selected to comprise that model is the integrated chip of PT2272-M4, is comprised that with its corresponding codes circuit model is the integrated chip of PT2262.Coding circuit has 4 buttons; Decoding circuit 100 has 4 road output terminal K1, K2, K3 and the K4 corresponding to 4 buttons, controls the switch of 4 loads respectively.Open when button clicks, close when clicking again.
In the following description of present embodiment; With being that example is elaborated only with the output terminal K1 of decoding circuit 100 corresponding differentiating circuit, reverse circuit, switch driving circuit; Differentiating circuit, reverse circuit, switch driving circuit that the output terminal K2 of decoding circuit 100, K3, K4 are corresponding respectively are identical with it, do not do at this and give unnecessary details.
2, differentiating circuit
Fig. 4 (A), Fig. 4 (B) are respectively the waveform synoptic diagram of differentiating circuit input voltage and output voltage; Shown in Fig. 4 (A); After decoding circuit receives the proper data frame, keep high level, promptly the input voltage Ui (t) of differentiating circuit is high level, for example 0-T, 2T-3T etc.; When not receiving the proper data frame, keep low level, promptly the input voltage Ui (t) of differentiating circuit is low level, for example T-2T, 3T-4T etc.
Shown in Fig. 4 (B); By low-voltage during to the high voltage saltus step, capacitor C 14 begins charging at differentiating circuit input voltage Ui (t), and differentiating circuit input voltage Ui (t) residual voltage partly is added on the resistance R 10; When charging is accomplished; When being t=R * C, charging is accomplished, and the output voltage U o of differentiating circuit (t) is 0; When input voltage Ui (t) by high voltage during to the low-voltage saltus step, capacitor C 14 begins discharge, sparking voltage flows to the earth through resistance R 10, accomplishes up to discharge, the output voltage of differentiating circuit is zero.The output waveform of differentiating circuit only reflects the sudden change part of importing waveform, promptly only extracts input signal by the saltus step of low level to high level, and in input output low level when keeping high level always.The width relevant with R * C (be the time constant of circuit, R is the resistance of resistance R 13, and C is the capacitance of capacitor C 15) of the waveform of sharp pulses of output, R * C is more little, and waveform of sharp pulses is narrow more, otherwise then wide.
Fig. 5 (A) for differentiating circuit occur undesired signal 1,1 ' the input voltage waveform synoptic diagram, undesired signal 1,1 ' respectively appears at t1-t2, t3-t4 constantly; Fig. 5 (B), Fig. 5 (C) be respectively differentiating circuit occur undesired signal 1,1 ' the output voltage waveforms synoptic diagram.In technical scheme of the present invention, the width that low level is disturbed, just the time interval of twice button has determined the time constant in the differentiating circuit, promptly R * C is greater than the time width of low level interference.
In Fig. 5 (B), when t=0,, keep low level because the voltage of capacitor C 14 can not suddenly change, the output voltage of differentiating circuit equals input voltage, is high level; At 0-t1 constantly, electric capacity begins charging, and residual voltage is added on the resistance R 10, and the output voltage of differentiating circuit begins gradually less than input voltage; When t1, low level undesired signal 1 occurs, because the voltage of capacitor C 14 can not suddenly change, capacitor C 14 becomes inverse electromotive force; When t1-t2, capacitor C 14 begins discharge, and sparking voltage flows to the earth through resistance R 10, the negative voltage that differentiating circuit output reduces gradually; At t2 constantly, end of interrupt, the input voltage saltus step of differentiating circuit is a high level, capacitor C 14 continues charging, but this moment capacitor C 14 voltage non-vanishing, thereby the output voltage of differentiating circuit is low level less than input voltage, therefore, disturbs to be invalid signals.
In Fig. 5 (C), low level undesired signal 1 ' appear at t3-t4 constantly, when t3, capacitor C 14 has been charged and has been finished, and voltage can not suddenly change, and capacitor C 14 becomes inverse electromotive force; At t3-t4 constantly, electric capacity begins discharge, and sparking voltage flows to the earth through resistance R 10, the negative voltage that differentiating circuit output reduces gradually; When t=t4, undesired signal 1 ' disappearance, the input voltage saltus step of differentiating circuit is a high level; Continue as capacitor C 14 chargings, but this moment, capacitor C 15 discharges did not finish, thereby the output voltage of differentiating circuit is less than input voltage; Be low level, therefore disturb to be invalid signals.
Synthesizing map 5 (A), Fig. 5 (B) and Fig. 5 (C) are owing to after in remote-control receiving circuit, having added differentiating circuit, make of short duration low level disturb and be invalid signals, thereby guaranteed that on-off circuit can misoperation.
3, reverse circuit and switch driving circuit
In Fig. 2, reverse circuit 300 can be selected d type flip flop IC1 for use, corresponding to 4 tunnel control channels, and preferred 2 double D triggers of d type flip flop; Switch driving circuit 400 can be selected triode Q1, relay coil and relay switch J1 for use.Decoding circuit output terminal K1 connects the 3rd pin (clock signal terminal) of d type flip flop; The 5th pin (signal input part) of d type flip flop connects its 2nd pin (reverse signal output terminal), and its first pin 1 (signal output part) connects the base stage of triode Q1, the grounded emitter of triode Q1 through resistance R 1; One end of its collector connecting relay coil; Another termination high level of relay coil, said high level can be the DC voltage-stabilizing electricity of direct current regulation circuit output, and relay switch J1 is connected in the load circuit.
When the pulse triggering signal after being removed interference was high level by low transition, when the rising edge of the clock signal terminal of d type flip flop IC1 arrived, the data output end of d type flip flop kept the level state the same with data input pin; And the data input pin connection is the reverse data output terminal; Therefore, upset when data output end arrives at the rising edge of clock signal terminal, promptly the 1st pin of d type flip flop changes level state; Comprise: become high level by low level, or become low level by high level.
When the 1st pin of d type flip flop IC1 is exported high level; Resistance R 1 plays the dividing potential drop effect and avoids high level to burn out triode; When remaining voltage after dividing potential drop during greater than the cut-in voltage of triode Q1; Triode Q1 conducting, thus relay coil gets the electric relay switch J1 closure that links to each other with load that makes, thus the load energising can be worked; In like manner, when the pulse triggering signal of signal receiving unit output is low level, first pin, 1 output low level of d type flip flop IC1, triode Q1 ends, thus relay coil J51 dead electricity makes relay switch J52 break off, thus the load outage quits work.
Only be the preferred embodiments of the present invention below, but the present invention is not limited only to this, trigger is optional JK flip-flop etc. also, the optional powerful metal-oxide-semiconductor of switch driving circuit, optocoupler etc.
4, direct current regulation circuit
Direct current regulation circuit 500 is used for changing electric main input into the DC voltage-stabilizing electricity, rectifier bridge, stabilivolt that this circuit comprises transformer T1, is made up of diode D1, D2, D3, D4.Transformer T1 converts the alternating current of 220V in the alternating current of 13V; The alternating current of 13V converts direct current into through behind the rectifier bridge; Said direct current is become the direct current of 12V by voltage stabilizing behind stabilivolt L7812; The direct current of 12V is used as the driving power of relay, the follow-up direct current that behind stabilivolt L7805, obtains 5V of the direct current of 12V, and the direct current of 5V is as the power supply of decoding circuit 100, reverse circuit 300.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (7)
1. remote-control receiving circuit; Comprise the decoding circuit (100), reverse circuit (300) and the switch driving circuit (400) that connect successively; Said decoding circuit is used to receive the switch controlling signal that comprises the low level interference; And convert switch controlling signal into pulse triggering signal, and it is characterized in that, also comprise the differentiating circuit (200) that is connected between said decoding circuit (100) and the said reverse circuit (400);
Said differentiating circuit (200) comprises first electric capacity, first resistance, second resistance and diode; The capacitance of said first electric capacity is C; The resistance of said first resistance is R; One end of said first electric capacity connects an end of said first resistance, the other end ground connection of said first resistance, and the positive pole of said diode connects said decoding circuit (100); The negative pole of said diode connects the said first electric capacity other end, and said first electric capacity is connected reverse circuit (300) with the joint of said first resistance through second resistance;
The time that the time constant R of said differentiating circuit * C disturbs greater than low level.
2. remote-control receiving circuit according to claim 1 is characterized in that, said differentiating circuit also comprises the negative pole that is connected said diode and the 3rd resistance between the ground.
3. remote-control receiving circuit according to claim 1 is characterized in that said decoding circuit comprises the integrated chip of model PT2272-M4; Said reverse circuit is a d type flip flop; Said switch driving circuit is metal-oxide-semiconductor or optocoupler.
4. remote-control receiving circuit according to claim 3 is characterized in that, said d type flip flop is a double D trigger, and the quantity of said double D trigger is at least 1/2nd of load circuit quantity.
5. remote-control receiving circuit according to claim 1; It is characterized in that said switch driving circuit comprises triode, relay coil and relay switch, the base stage of said triode connects the signal output part of reverse circuit (300); Its grounded emitter; One end of its collector connection relay coil, another termination high level of said relay coil, said relay switch is connected in the load circuit.
6. remote-control receiving circuit according to claim 1 is characterized in that, also comprises direct current regulation circuit (500), and said direct current regulation circuit is decoding circuit (100), reverse circuit (300), switch driving circuit (400) power supply.
7. remote-control receiving circuit according to claim 6 is characterized in that, also comprises direct current regulation circuit (500), and said direct current regulation circuit (500) comprises reduction voltage circuit, rectification circuit and the mu balanced circuit that connects successively;
Said reduction voltage circuit is used for converting the High Level AC Voltage of input into low-voltage AC;
Said rectification circuit is used for converting the low-voltage AC of input into low-voltage DC;
Said mu balanced circuit is used to export DC voltage-stabilizing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101080835A CN101923769B (en) | 2009-06-15 | 2009-06-15 | Remote control receiving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101080835A CN101923769B (en) | 2009-06-15 | 2009-06-15 | Remote control receiving circuit |
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| CN101923769A CN101923769A (en) | 2010-12-22 |
| CN101923769B true CN101923769B (en) | 2012-02-08 |
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| CN2009101080835A Active CN101923769B (en) | 2009-06-15 | 2009-06-15 | Remote control receiving circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106920375A (en) * | 2015-12-27 | 2017-07-04 | 重庆尊来科技有限责任公司 | A kind of four yards of automobile remote control receivers of double wave |
| CN109300437B (en) * | 2018-11-07 | 2020-11-24 | 深圳市国华光电科技有限公司 | An electrowetting display device driving method and system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2363198Y (en) * | 1999-03-04 | 2000-02-09 | 莫大奎 | Radio remote controlled ignitor for fireworks |
| CN2376694Y (en) * | 1999-01-12 | 2000-05-03 | 袁立知 | A remote control receiving device for household appliances |
| CN2502458Y (en) * | 2001-09-25 | 2002-07-24 | 朱鸿彪 | Remote control receiver |
| CN2729840Y (en) * | 2003-08-27 | 2005-09-28 | 程克学 | Lamp switch controlled by infrared remote-controller of domestic electrical equipment |
| CN201251847Y (en) * | 2007-05-17 | 2009-06-03 | 杨贵平 | Infrared remote-control switch of time identification code |
-
2009
- 2009-06-15 CN CN2009101080835A patent/CN101923769B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2376694Y (en) * | 1999-01-12 | 2000-05-03 | 袁立知 | A remote control receiving device for household appliances |
| CN2363198Y (en) * | 1999-03-04 | 2000-02-09 | 莫大奎 | Radio remote controlled ignitor for fireworks |
| CN2502458Y (en) * | 2001-09-25 | 2002-07-24 | 朱鸿彪 | Remote control receiver |
| CN2729840Y (en) * | 2003-08-27 | 2005-09-28 | 程克学 | Lamp switch controlled by infrared remote-controller of domestic electrical equipment |
| CN201251847Y (en) * | 2007-05-17 | 2009-06-03 | 杨贵平 | Infrared remote-control switch of time identification code |
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