CN202939434U

CN202939434U - Infrared wake-up receiving circuit

Info

Publication number: CN202939434U
Application number: CN 201220568647
Authority: CN
Inventors: 曾招辉; 李家诚; 宋锡强
Original assignee: Holley Technology Co Ltd
Current assignee: Holley Technology Co Ltd
Priority date: 2012-10-31
Filing date: 2012-10-31
Publication date: 2013-05-15
Anticipated expiration: 2022-10-31

Abstract

The utility model discloses an infrared wake-up receiving circuit. Equipment in the prior art which carries out data transmission in an infrared signal mode has relatively large power consumption and easily generates wrong wake-up situations because of light interference on a receiver caused by an incandescent lamp, an energy saving lamp or sunshine light. The infrared wake-up receiving circuit comprises a control center and a receiver which are mutually connected, the control center controls a switch of the receiver and is connected with a pre-processing circuit, the pre-processing circuit comprises a photosensitive control circuit and an electronic switch, and the electronic switch is connected with the control center and transmits control signals. The pre-processing circuit carries out processing of wake-up signals; passive wake-up signal receiving is changed into active judging to determine whether a wake-up signal exists; no further need of timed active start of the receiver is controlled; power consumption can be further saved effectively, moreover, wrong reading of the wake-up signals can be further reduced.

Description

A kind of infrared receiving circuit that wakes up

Technical field

The utility model relates to the electronic circuit technology field, specifically refers to a kind of receiving circuit that is waken up by infrared signal.

Background technology

for convenience of staff's copy reading ammeter data, a lot of ammeters all adopt in the mode of infrared signal and carry out the data transmission, in existing ammeter with infrared copy reading data circuit, all generally to wake single-chip microcomputer work up by the 38KHZ signal that receiver (for example model is the infrared receiving tube of HM638R) reception infrared palm machine sends over, and then carried out the transmission of data by receiver, this working method needs single-chip microcomputer initiatively to open receiver to have judged whether wake-up signal, therefore, under sleep state, the program of solidifying in single-chip microcomputer need to remove to open receiver every 1S or 2S.Above-mentioned working method, not only power consumption is larger, and receiver is easy to be caused false wake-up by the interference of the light of incandescent lamp, electricity-saving lamp, sunshine.

The utility model content

The utility model provides a kind of infrared receiving circuit that wakes up, can carry out pre-service to judge whether that initiatively needing to open receiver transmits, and has saved power consumption, and can reduce the false wake-up probability by infrared wake-up signal in this circuit.

In order to solve the problems of the technologies described above, the utility model adopts following technical scheme: a kind of infrared receiving circuit that wakes up, comprise interconnective control center and receiver, described control center controls the switch of receiver, described control center has connected pre-process circuit, described pre-process circuit comprises photosensitive control circuit and electronic switch, and described photosensitive control circuit is controlled the switch of electronic switch, and described electronic switch connects described control center and pipage control signal.Directly do not receive by receiver the wake-up signal that infrared palm machine sends over, but first judge whether wake-up signal from infrared palm machine by photosensitive control circuit, wake control center up if wake-up signal is arranged have electronic switch to send out control signal, and then the unlatching receiver begins data reading system.

As further improvement of the utility model and optimization, can take following measure:

Described photosensitive control circuit has comprised a phototriode, the base stage of described phototriode is receiving end, collector has connected direct supply, emitter has connected the input negative terminal of comparer on the one hand successively through an electric capacity I, on the other hand through a resistance III ground connection, the input anode of described comparer connects direct supply through a resistance I on the one hand, and through a resistance VI ground connection, the output terminal of described comparer has connected the input end of electronic switch on the other hand.When phototriode did not receive wake-up signal, the positive end signal of the input in the differential input end of comparer was greater than the signal of input negative terminal, and its output terminal output high level can't the unlocking electronic switch; When phototriode receives wake-up signal, the conducting of photosensitive reception triode, the positive end signal of the input in the differential input end of comparer less than the input negative terminal signal, its output terminal output low level, the unlocking electronic switch wakes control center up.

Described electric capacity I is connected in series a resistance II with the input negative terminal of comparer, and described resistance II is less than the resistance I.

The tie point of described electric capacity I and resistance II connects direct supply through a resistance V on the other hand on the one hand through a resistance IV ground connection.

Described electronic switch is a positive-negative-positive triode, and the base stage of described positive-negative-positive triode connects the output terminal of described comparer, and emitter has connected direct supply, and the one side of collector is as the control signal output terminal, on the other hand through a resistance VII ground connection.

Described direct supply advances an electric capacity II ground connection, and the input negative terminal of described comparer is through an electric capacity III ground connection, and the output terminal of described comparer advances an electric capacity IV ground connection.

Described control center has comprised a single-chip microcomputer.

Described receiver is infrared reception triode.

After adopting technique scheme, the utlity model has following advantage: before the read-write of receiver turn-on data, there is pre-process circuit that wake-up signal is processed, become the wake-up signal that judged whether of active by passive reception wake-up signal, control needn't be more regularly initiatively open receiver, can effectively save power consumption, can also reduce wake-up signal simultaneously and misread.

Description of drawings

Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:

Fig. 1 is the utility model structured flowchart;

Fig. 2 is the concrete connection layout of the pre-process circuit in the utility model.

Embodiment

Referring to Fig. 1 and 2, a kind of infrared receiving circuit that wakes up comprises interconnective control center and receiver, and described control center controls the switch of receiver, and described control center has comprised a single-chip microcomputer, and described receiver is infrared reception triode.Described control center has connected pre-process circuit 1, described pre-process circuit 1 comprises photosensitive control circuit and electronic switch, described photosensitive control circuit is controlled the switch of electronic switch, and described electronic switch connects described control center and pipage control signal.Directly do not receive by receiver the wake-up signal that infrared palm machine sends over, but first judge whether wake-up signal from infrared palm machine by photosensitive control circuit, wake control center up if wake-up signal is arranged have electronic switch to send out control signal, and then the unlatching receiver begins data reading system.

Described photosensitive control circuit has comprised a phototriode Q1, the base stage of described phototriode Q1 is receiving end, collector has connected direct supply, emitter has connected the input negative terminal of comparer U1 on the one hand successively through an electric capacity I C1, on the other hand through a resistance III R3 ground connection, the input anode of described comparer connects direct supply through a resistance I R1 on the one hand, and through a resistance VI R6 ground connection, the output terminal of described comparer U1 has connected the input end of electronic switch on the other hand.Be connected in series a resistance II R2 between the input negative terminal of described electric capacity I C1 and comparer U1, described resistance II R2 is less than resistance I R1.The tie point of described electric capacity I C1 and resistance II R2 connects direct supply through a resistance V R5 on the other hand on the one hand through a resistance IV R4 ground connection.The resistance of resistance V R5 equals resistance I R1, and the resistance of resistance IV R4 is less than the resistance of resistance VI R6.

Described electronic switch is a positive-negative-positive triode Q2, the base stage of described positive-negative-positive triode Q2 connects the output terminal of described comparer U1, emitter has connected direct supply, and the one side of collector is as the control signal output terminal, on the other hand through a resistance VII R7 ground connection.

When phototriode does not receive wake-up signal, the positive end signal of input in the differential input end of comparer is greater than the signal of input negative terminal, its output terminal output high level, positive-negative-positive triode Q2 cut-off, single-chip microcomputer in control center send low level, do not trigger interruption, single-chip microcomputer keeps low power sleep mode; When phototriode receives wake-up signal, the conducting of photosensitive reception triode, the positive end signal of input in the differential input end of comparer is less than the signal of input negative terminal, its output terminal output low level, positive-negative-positive triode Q2 cut-off, the single-chip microcomputer in control center send high level, triggers to interrupt, wake single-chip microcomputer up and open infrared reception triode, carry out the operations such as infrared communication copy reading.

For filtering, described direct supply advances an electric capacity II C2 ground connection, and the input negative terminal of described comparer U1 is through an electric capacity III C3 ground connection, and the output terminal U1 of described comparer advances an electric capacity IV C4 ground connection.

Except above preferred embodiment, the utility model also has other embodiment, those skilled in the art can make various changes and distortion according to the utility model, only otherwise break away from spirit of the present utility model, all should belong to the defined scope of the utility model claims.

Claims

1. one kind infrared receiving circuit that wakes up, comprise interconnective control center and receiver, described control center controls the switch of receiver, it is characterized in that: described control center has connected pre-process circuit (1), described pre-process circuit (1) comprises photosensitive control circuit and electronic switch, described photosensitive control circuit is controlled the switch of electronic switch, and described electronic switch connects described control center and pipage control signal.

2. the infrared receiving circuit that wakes up according to claim 1, it is characterized in that: described photosensitive control circuit has comprised a phototriode (Q1), the base stage of described phototriode (Q1) is receiving end, collector has connected direct supply, emitter has connected the input negative terminal of comparer (U1) on the one hand successively through an electric capacity I (C1), on the other hand through resistance III (R3) ground connection, the input anode of described comparer connects direct supply through a resistance I (R1) on the one hand, on the other hand through resistance VI (R6) ground connection, the output terminal of described comparer (U1) has connected the input end of electronic switch.

3. the infrared receiving circuit that wakes up according to claim 2 is characterized in that: be connected in series a resistance II (R2) between the input negative terminal of described electric capacity I (C1) and comparer (U1), described resistance II (R2) is less than resistance I (R1).

4. the infrared receiving circuit that wakes up according to claim 3 is characterized in that: the tie point of described electric capacity I (C1) and resistance II (R2) connects direct supply through a resistance V (R5) on the other hand on the one hand through resistance IV (R4) ground connection.

5. the infrared receiving circuit that wakes up according to claim 2, it is characterized in that: described electronic switch is a positive-negative-positive triode (Q2), the base stage of described positive-negative-positive triode (Q2) connects the output terminal of described comparer (U1), emitter has connected direct supply, the one side of collector is as the control signal output terminal, on the other hand through resistance VII (R7) ground connection.

6. the described infrared receiving circuit that wakes up of according to claim 2 to 5 any one, it is characterized in that: described direct supply advances electric capacity II (C2) ground connection, the input negative terminal of described comparer (U1) is through electric capacity III (C3) ground connection, and the output terminal of described comparer (U1) advances electric capacity IV (C4) ground connection.

7. the infrared receiving circuit that wakes up according to claim 1, it is characterized in that: described control center has comprised a single-chip microcomputer.

8. according to claim 1 or 7 described infrared receiving circuits that wake up, it is characterized in that: described receiver is infrared reception triode.