CN2293159Y - High sensitive infrared receiving device - Google Patents

Abstract

The utility model relates to a high-sensitivity infrared receiving device. The position occupied by a circuit board part of the utility model is equal to the position occupied by a special infrared receiving and amplifying IC; compared with the receiving range of the existing infrared receiving device, the receiving range of the utility model is increased by more than one time. The utility model is characterized in that the input terminal and the output terminal of a frequency-selecting amplifying diode are respectively connected with a capacitor to be connected with a resistor whose one end enters into ground together; the input terminal and the output terminal of a triode are connected with another resistor. The device adopts generally universal device combination, and has the advantages of low cost, stable operation and simple adjustment; the utility model has an ideal threshold for receiving an infrared main frequency band; the utility model is convenient to develop nondirectional electric appliances in infrared remote-control series, and simultaneously brings convenience for the arrangement of multi-path infrared frequency-selecting receiving devices.

Description

High sensitivity infrared receiver

The utility model relates to a kind of infrared receiving device, and particularly a kind of being applicable to receives lower simple and easy, the low-power consumption of modulating frequency, high sensitivity infrared receiver.

The receiving system of existing infrared remote control, general two classes that all make up or join a little electrons device composition with special-purpose amplification circuit with electronic devices and components; When this device cooperates with the infrared controller of general transmitting power, the short and stronger defective of directivity of command range is arranged, can not satisfy user's needs of control arbitrarily; The infrared receiving terminal that integrates infrared reception, amplification, detection, shaping pulse that extensively adopts when near, though the advantage that volume is little, easy for installation and receiving sensitivity is high is arranged, but its cost is high slightly, and the defective of interference free performance difference is arranged mostly, uncomfortable reception as simple instruction control; And the infrared reception basic frequency of above-mentioned infrared receiving device is too wide, as is placed in the small household electrical appliance of controlling as single signalizing activity, is subject to the interference of other household electrical appliances infrared controller of user.

The purpose of this utility model is to propose one and simple and easy, the low-power consumption of cheap general-purpose device, highly sensitive, high anti-interference infrared receiving device; It is compared with the infrared receiving device of existing integrated circuit combination, and controllable distance doubles above.

The purpose of this utility model is to realize like this; Put infrared signal amplifying circuit more than the secondary at infrared receiving tube signal conveys end, behind simple and easy amplitude limit, amplify main circuit by the frequency-selecting that transistor and accessory are formed; The feature that electrically connects that main circuit is amplified in this frequency-selecting is: this frequency-selecting amplifying triode input (base stage) end is respectively contacted with output (the integrated utmost point) end behind the electric capacity, the resistance of going into ground with one one end joins (signal input part of this contact double as selective frequency amplifier circuit) altogether, again at the input of this a triode resistance in parallel with output; This output is the signal output part of selective frequency amplifier circuit; Behind known detection, filtering, signal pulse shaper circuit, the infrared modulated pulse signal is restored; Its basic principle is: the signal that is received by infrared receiving tube, behind multistage amplification and amplitude limit, the infrared signal level that receives is equated with the noise level that prime (infrared receiving tube and preposition amplifier tube) amplifier tube produces, select amplification by follow-up selective frequency amplifier circuit handle and noise with the signal of level again, for filtering in short-term backbone disturb and disturb, the long chi C filter road circuit of base when the frequency-selecting amplifying signal must be provided with after detection with audio-frequency noise; In the signal transformation circuit, the signal that disposes any way as far as possible amplifies or Schmidt's negative circuit in the pulse of back level, so as to its stability of further raising, thereby realizes the purpose of this utility model.

It is low that cost of the present utility model uses application-specific integrated circuit (ASIC), and its wiring board part is taken up an area of and also believed and equating that integrated circuit makes up.Because adopt such scheme, its infrared reception dominant frequency bandwidth threshold is about about 20% of centre frequency, it had both adapted to the tranmitting frequency drift of general simple and easy infrared transmitter, and the infrared frequency-selecting receiving system of multichannel can be set again simultaneously; The utility model such as adapted 3V power supply, the average about 50MA's of operating current is infrared to penetrate controller, places indoorly, is one to overlap direction-free infrared remote-control device.

Below in conjunction with the embodiment accompanying drawing, the utility model is described in further detail.

Fig. 1 is the utility model first embodiment, the infrared emission controller circuitry schematic diagram of " infrared remote control position controlled rotary antenna ".

Fig. 2 is the utility model first embodiment, and the machine circuit schematic diagram is sat in the indoor infrared reception of " infrared remote control position controlled rotary antenna ".

Fig. 3 is the utility model first embodiment, the antenna part circuit theory diagrams of " infrared remote control position controlled rotary antenna ".

Fig. 4 is the utility model second embodiment, the infrared emission controller circuitry schematic diagram of " TV remote adapter ".

Fig. 5 is the utility model second embodiment, the infrared reception station selector of the U channel circuit theory diagrams of " TV remote adapter ".

Fig. 6 is the utility model the 3rd embodiment, " high sensitivity infrared receiver " circuit theory diagrams.

Fig. 7 is 1 of Fig. 1: l outward appearance front view.

Fig. 8 is 1: 1 outside drawing of Fig. 2.

Fig. 9 is 4: 1 outside drawings of Fig. 3.

With reference to Fig. 1, by two inputs, four NAND gate integrated packages, current amplifier tube (T1) infrared transmitting tube (DE1), infrared emission indicator tube (DE2), and accessory is formed general known constant amplitude dominant frequency infrared emission main circuit, (SK1 or SK2) is arbitrary when turning to control button when control, and infrared transmitter work is connected in integrated package (IC1) power supply.

With reference to Fig. 2, signal by infrared receiving tube (DE3) reception, through three grades of (T2, T3, T4) infrared signal is amplified and diode (D1, D2) behind the amplitude limit, transporting to frequency-selecting amplifies, this frequency-selecting signal amplifies main circuit by triode transistor (T5), input capacitance (C1), feedback capacity (C2), feedback resistance (W2+R2) and phase shift resistance (R1) are formed, the frequency-selecting amplifying signal is by phase shift resistance (R1), the junction input of input capacitance (C1) and feedback capacity (C2), semifixed resistor (W1) is regulated for the signal input threshold, (W2) amplify output (collector electrode) voltage trim for frequency-selecting, frequency-selecting signal through amplifying is by diode (D3) detection, through (C3, C4, R3, R4) filter circuit, (R5) transports to resistance (T6 by resistance, T7) the pulse reproduction switching circuit of forming, this switching circuit engages with ac thyristor (DS1) the control utmost point through current-limiting resistance (R6), and its follow-up go to circuit all belongs to general known circuits.

This embodiment Fig. 1, the circuit working state of Fig. 2 is as follows: when Fig. 2 infrared receiving circuit is in quiescent operation, it is lower that master unit (T5) collector potential is amplified in frequency-selecting, and the series connection pressure drop of detector diode (D3) arranged, so the telecommunications of pulse reproduction switching circuit prime (T6) base terminal is lower than self by (R7, R8) the emitter current potential of dividing potential drop, (T6, T7) end, follow-up controllable silicon (DSI) thereby end, in pressing Fig. 1, turn to control button (SK1) or (SK2) time, infrared transmitter work, the infrared receiving device of Fig. 2 receives this signal and amplifies, frequency-selecting is amplified master unit (T5) collector electrode and is obtained amplitude higher signal level, this signal is by diode (D3) detection with by (C3, C4, R3, R4) behind the filter circuit of Zu Chenging, formation is higher than the potential value of above-mentioned pulse reproduction switching circuit (T6) amplifier tube emitter, (T6, T7) circuit thereby conducting, follow-up controllable silicon (DSI) conducting; Press in the receiving apparatus (Fig. 2) at the utility model, the numerical value of phase shift resistance (R1), feedback resistance (W2+R2), input capacitance (C1), feedback capacity (C2) determines the resonance frequency of this audio amplifier, the numerical value of its resistance and electric capacity is big more, and its frequency-selecting resonance frequency is just low more; The capacity ratio of input capacitance (C1) and feedback capacity (C2) should be selected for use between 1: 1 to 1: 5 and be advisable, and its Capacity Ratio is selected for use for a short time, frequency-selective amplifying stage frequency band broad, on the contrary then frequency-selecting amplification frequency band is narrower; The feedback resistance of selective frequency amplifier circuit (W2+R2) value is between 0.2M to 2M, and is too big as the resonance frequency amplitude of variation of finding the frequency-selecting amplification when regulating collector electrode (T5) static pressure magnitude of voltage (regulating W2), should suitably strengthen the resistance of (R2) in the feedback resistance; For guaranteeing the high sensitivity of infrared receiving device, level behind infrared receiving tube, must be provided with three grades with signal amplify.

With reference to Fig. 3, this amplifying device, the antenna transfer all belongs to the known circuits of extensive employing, in the circuit, terminals (Z1, Z2, Z3, Z4) engage with the V-band and the U wave band pick-up dipole of television receiving antenna, link (OUT) engages with the link (T0) of Fig. 2 by a high frequency coaxial feeder line, and another link (TUV) of Fig. 2 engages with the aerial signal input jack of television receiver.

The antenna of this enforcement amplifies, turn to work as follows: when the controllable silicon among Fig. 2 (DS1) ends, the secondary cold junction of going the same way of power transformer (B) is gone into ground behind rectifier diode (D4), power supply output connects end (T0) and is output as the positive half wave power supply, its positivity half-wave power supply can only be used for Fig. 3 antenna amplification device part antenna amplifier tube (T8, T9) commutation supply voltage source by external high frequency coaxial feeder line; When above-mentioned controllable silicon (DSI) conducting, above-mentioned rectifier diode (D4) two ends are regarded as short circuit, should be output as ac power supply by (T0) end, negative pressure rectifying tube (D5) work among above-mentioned Fig. 3, its follow-up controllable silicon (DS2) conducting, the atomic type steer motor of AC synchronous pawl (M) running; Among Fig. 2, (SW) be mains switch, sit tractor driver's control and turn to button (SK3) that power supply indication (DE4), (DE5) are for turning to the work indication.

With reference to Fig. 4, Fig. 5, this embodiment is in the circuit of implementing more perfect " TV remote adapter ", with the utility model device, replace former infrared receiving device, become the TV remote adapter of high sensitivity infrared receiver, operation principle and Fig. 2 of this infrared receiving device are identical, and the circuit theory of this embodiment and outside drawing are with reference to " TV remote adapter " first embodiment (patent No.: 91230931.8)

With reference to Fig. 6, be the high sensitivity infrared receiver of circuit than simplification, its operation principle is also same as the previously described embodiments, the part of having any different slightly is that signal is after infrared receiving tube (DE11) transfers electric signal to, amplify through three grades of (T11, T12, T13) high powers, infrared signal equates with the noise level that prime produces, suitably select the bias current feedback resistance (R11) of second level signal amplifier tube (T13) for use in addition, both saved simple and easy amplitude limiter circuit, saved the input of the signal to frequency-selecting amplifying signal input partiting dc capacitor simultaneously again from (T13) collector electrode; The feedback current bias resistance that its frequency-selecting is amplified to circuit has adopted this adaptability that is this frequency-selecting amplifying device has the certain width frequency band of fixed resistance (R12) (to implement proof, as long as determined the numerical value of each input, output capacitance and feedback resistance, even the frequency of oscillation semifixed resistor in the infrared emission controller is also changed into fixed resistance, implement in batches also need not be aligned), output (G), quiet when reaching work for just, when receiving infrared signal, turn over and be zero potential, be situated between to such an extent that signal output part equates with general infrared amplifier integrated block.

With reference to Fig. 7, mould shell (1), turn to control button (2), infrared emission indication (3), infrared transmitting tube (4).

With reference to Fig. 8, mould lid (5), mould at the end (6), mould the end, cover seam (7), mains switch (8), infrared receiving window position (9), power supply with turn to indication position (10), sit the high-frequency line plug (13) that tractor driver's control turns to button (11), power plug wire (12), engages with the TV set aerial input, ventilation fenestra (14), high frequency coaxial line socket (15) place and sit the machine back, are (T0) ends among Fig. 2.

With reference to Fig. 9, television receiving antenna oscillator (16), director reflector (17), antenna holder (18), steering mechanism's overcoat (19), steering mechanism's loam cake (20), support bar (21), amplifying device box (22), fixed screw (23), high frequency axis plug (24).

Claims (3)

1, a kind of high sensitivity infrared receiver is made up of infrared reception, signal amplification, amplitude limit, detection, filtering, pulse signal shaping circuit; It is characterized in that: form frequency-selecting by transistor and attached part in addition and amplify main circuit, this frequency-selecting amplifying triode input is respectively connected with output behind the electric capacity, the resistance of going into ground with one one end joins altogether, again at this triode input and output, and resistance in parallel.

2, according to the described device of claim 1, it is characterized in that: the input capacitance (C1) of frequency-selecting amplification main circuit and the Capacity Ratio of feedback capacity (C2) are between 1: 1 to 1: 5.

3, device according to claim 1 is characterized in that: the feedback resistance of selective frequency amplifier circuit (W2+R2) value is between 0.2M to 2M.

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