JPS63202135A - Receiver - Google Patents

Abstract

PURPOSE:To save power without causing hindrance to signal reception by interrupting power to a reception section, setting the power supply period to a time capable of being receiving a signal of the reception section and switching the signal into consecutive power feeding after the signal reception. CONSTITUTION:A switching circuit 6 is conductive at a time t1 and nonconductive at a time t2 to repeat the switching, and power is supplied intermittently by a reception section 4 while the time t1 is used as a power supply period. In receiving an infrared ray signal L, a photodetection section 34 executes the power supply control program from the front ridge after the arrival of a reception signal Vr at the feeding time t1 by a control section 18 to generate the 2nd switching signal SW2. As a result, the reception section 4 is in the feeding state after a prescribed time t3 from the reception of the reception signal Vr and kept to the consecutive operating state. Since the power consumption is saved, the capacity of the power supply 2 is reduced.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a receiving device with reduced power loss.

[Conventional technology]

Receiving devices such as whistle sensors that use sound such as whistling as a signal transmission medium, and remote control devices that use infrared rays as a signal transmission medium, have a receiving section that receives the transmitted signal, and a receiving section that reads necessary data from the signal received by the receiving section. It is equipped with a control section.

The receiving section includes a signal converting section that converts light and sound into electrical signals,
The amplification section includes an amplification section that amplifies a received signal, and the amplification section is configured with an amplification element such as a transistor.

[Problem that the invention seeks to solve]

In such a receiving device, the amplifier section has the function of amplifying the incoming signal, although it consumes considerable power.
It is necessary to maintain power supply at all times, and in order to cope with such power consumption, the power supply capacity is increased.

Additionally, in order to reduce power consumption, it may be possible to selectively supply power between circuit sections, but this would require a startup circuit section to perform selective startup and overall startup as needed. It is necessary to constantly supply power to the startup circuit, which impedes power saving.

Therefore, the present invention aims to save power by changing the form of power supply.

[Means for solving problems]

As shown in FIG. 1, the receiving device of the present invention includes a switching means (switching circuit 6) for supplying power to or stopping the power supply to a receiving section 4 that receives a signal (for example, an infrared signal L), and Power is intermittently supplied to the receiving section 4 by switching the switching means with the operating time during which the receiver can receive the signal as the power supply time (tI), and when the receiving section 4 receives the signal, the switching means The controller 18 includes a controller 18 that stops switching and continuously supplies power to the receiver 4 for a certain period of time (t).

[For production]

In the receiving device of the present invention, power is supplied intermittently to the receiving unit 4, which consumes the most power, and the power supply interval is set to a time (t,) at which the received signal can be recognized, and the power is supplied according to the received signal. The intermittent power supply is changed to continuous power supply for a certain period of time (t3) to avoid any problem in signal reception.

〔Example〕

FIG. 1 shows an embodiment of a receiving device of the present invention.

This receiving device uses a battery or the like as a driving power source 2, and a switching circuit 6 is installed between the driving power source 2 and a receiving section 4 for receiving signals as a switching means for controlling power supply to the receiving section 4. ing.

The switching circuit 6 includes, for example, a transistor 8 and a resistor 10, and has a first circuit for controlling the power supplied from the control section 18 to the base of the transistor 8 via the resistor 12 and diodes 14, 16. A switching operation is performed by the switching signal SWI and the second switching signal SW2.

As shown in FIG. 2, the control unit 18 includes, for example, a central processing unit (CPU) 20 that performs arithmetic processing and signal input/output processing according to a predetermined program, and an input unit 22 that takes in signals.
and an output unit 24 that takes out signals as calculation results, a read-only memory element (ROM) 26 that stores calculation processing programs and fixed data, and a writable and readable memory that stores various data necessary for calculations and calculation results. It is composed of an element (RAM) 28, and uses an oscillation element 30 to generate a clock pulse CLK.

Therefore, the control unit 18, according to the power supply control program,
For example, the first switching signal S shown at A in FIG.
Form a WI. This switching signal SW1 is applied to the base of transistor 8 through diode 14 and resistor 12, and turns transistor 8 on and off alternately. By the way, the minimum operating time of the receiving section 4 capable of receiving signals is a unique value determined by the function of the receiving section 4 and the form of the signal in one system, so the switching signal SWI is determined by the operating time or Power supply time that meets the demand for significantly reducing power consumption 1. and a power supply cutoff time t2 in which the power supply is cut off are alternately repeated.

As a result, the switching circuit 6 is activated at time 1. It becomes conductive at time t2, becomes non-conductive at time t2, repeats the switching operation, and power is intermittently supplied to the receiving section 4 with time L1 as a power supply period.

In such a power feeding state, the amplifying section 32 of the receiving section 4 repeats the operating state and receives signals.

In this case, since transmitted infrared rays are used as a signal transmission medium, the receiving section 4 is equipped with a light receiving section 34 that receives an infrared signal from a transmitting section (not shown). As shown in Figure B, it is composed of intermittent pulse modulated waves. Therefore, the light receiving section 34 uses a light receiving diode 36 as a signal converting means for converting the infrared signal into an electric signal, receives the infrared signal, converts it into an electric signal, and applies it to the amplification section 32. The amplifying section 32 performs waveform shaping and amplification of this received signal, and finally generates a pulsed received signal 2 shown in C in FIG.
Add to the control section 18. The amplification section 32 constitutes a circuit for waveform shaping and amplification of the received signal, so it is the section that consumes the largest amount of power.

Incidentally, the CI shown in C in FIG. If the power supply state to the receiving unit 4 is interrupted by the switching signal SWI after the first received signal v, recognized from the infrared signal received by the infrared signal V4, the necessary signal reception cannot be performed. It turns out.

Therefore, the control unit 18 starts from the arrival of the received signal V at the power feeding time t, executes the power feeding control program from the leading edge of the received signal V, and generates the second switching signal SW2. This switching signal S W z passes from the leading edge of the first received signal V, , as shown in D in FIG. 3, through C2 in C in FIG. , is kept at the L level continuously for a certain period of time t3 until the end of , and is released after the reception signal V, , of C1 arrives. Therefore, this switching signal SW
z is applied to the base of the transistor 8 of the switching circuit 6 via the diode 16 and the resistor 12, and makes the transistor 8 continuously conductive in the L level section. As a result, the receiving section 4 enters the power supply state at a certain time t3 after receiving the received signal (2), and is continuously maintained in the operating state. At this time, the control unit 18 reads necessary data from the captured reception signal V, and outputs the data D. The uT is output to a decoder (not shown).

Then, after the second switching signal SW2 is released, only the first switching signal SW + remains,
As shown in FIG. 3E, the base of the transistor 8 of the switching circuit 6 is connected to a first switching signal SW when no signal is being received, and a second switching signal SW when a signal is being received.
The switching signal SW by the switching circuit SWz of
(=SW, +SW,), and as a result, as shown in F in FIG.
Intermittent power supply is performed, with the power supply state being in the power supply state at 9, t, and the power supply being cut off at 1t.

In this way, if the power supply period is minimized to the necessary minimum for the receiving section 4, especially for the amplifier section 32 which consumes a large amount of power,
Since power consumption can be reduced, the capacity of the power source 2 can be reduced, and if the power source 2 is configured with a battery, its consumption can be suppressed and its life can be extended.

FIG. 4 shows the first switching signal SW in the control unit 18.
A program for obtaining I is shown below.

Clock pulse CLK representing time t in step S1
Set the count setting value NI in the RAM 28, step S,
The clock pulse CLK is counted.

Assuming that the count value is N, the count value N and the count setting value N1 are compared in step S, and it is determined whether or not N ``'' N +. If N<Nl (NO), the process moves to step S4, generates an L output, returns to step SZ, and continues counting the clock pulses CLK. In addition, if N = N + (YES), step S
, and after canceling the count setting value N1, the count setting value N2 is set.

Then, proceeding to step S, the clock pulse CLK
is counted, and in step S, the count value N and the count setting value N2 are compared to determine whether N=N2.
If <N2 (NO), the process moves to step S, where an H output is generated, and then returns to step S6, where m consecutive counting of clock pulses CLK is performed. Also, N=
If it is N (YES), the process moves to step S to generate an L output, and returns to step SI to set the count setting value N.

By executing such a program, the first switching signal SWl shown at A in FIG. 3 is obtained.

If a receiving device that divides power supply in this way is used in a transmitting/receiving system such as a whistle sensor, a batch identification system, or a remote control, power saving can be achieved. Can perform time movements.

Further, in the embodiment, the time t3 of the second switching signal S W z is set on the program, but by controlling it with a timer, it is possible to reduce the transmission power in a 7-yard system, etc. can.

Although the embodiments have been described using infrared signals as an example of a signal transmission medium, the receiving device of the present invention can also be used when audio, radio waves, etc. are used as a signal transmission medium, and the switching circuit 6 Although described as an independent circuit, the same effect can be obtained even if it is integrated with the power supply 2 or the receiving section 4.

〔Effect of the invention〕

According to this invention, the power supply to the receiver is intermittent, the power supply period is set to a time during which the receiver can receive the signal, and after the signal is received, the power supply is switched to continuous power supply, so that there is no problem with signal reception. , power saving can be achieved.

[Brief explanation of the drawing]

1 is a block diagram showing an embodiment of the receiving device of the present invention, FIG. 2 is a block diagram showing a specific configuration of the control section of the receiving device shown in FIG. 1, and FIG. 3 is the same as that shown in FIG. 1. FIG. 4 is a flowchart showing a program for forming the first switching signal shown in FIG. 3. 4... Receiving section 6... Switching circuit (switching means) 18.
・Control unit

Claims (1)

[Scope of Claims] Switching means for supplying power to or disconnecting power from a receiving section that receives a signal; and switching means for switching the switching means by setting an operation time during which the receiving section can receive the signal as a power supply time. a control unit that intermittently supplies power to the receiving unit by causing the receiver to receive the signal, and when the receiving unit receives the signal, stops switching of the switching means to continuously supply power to the receiving unit for a certain period of time; A receiving device equipped with