JPH02224596A - Wireless remote control signal receiver - Google Patents

Abstract

PURPOSE:To make a remote control signal receptible immediately after application of power supply and to reduce the power consumption at a reception circuit by providing a rapid charging means comprising plural transistors(TRs), diodes and a voltage division circuit. CONSTITUTION:A transistor TR 5 is driven to be turned on by a power switch signal and a voltage of a battery 4 is applied to a reception circuit for a prescribed time. Then TRs 6a, 6b, 6c in a rapid charging means 6 are turned on by a rapid charging means drive signal and a voltage of the battery 4 is applied to a power supply stabilizing capacitor C1 and the capacitor C1 is charged rapidly up to a voltage of the battery 4 nearly. Moreover, a voltage of the battery 4 is generated at a collector of the TR 6b through the turning-on of the TR 6c and the voltage is divided by resistors 6d, 6e and fed to a gain setting capacitor C4 via a diode 6i and charged rapidly up to the voltage based on the divided voltage. Similarly, since the detection capacitor C3 is rapidly charged, a remote control signal is immediately received after application of power thereby reducing the power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wireless remote control signal receiver, and more particularly to a receiver that shortens the rise time from power-on to becoming ready for reception.

(Prior Art) In wireless remote control systems widely used in TVs, audio systems, etc., power is constantly applied to the remote control receiver (hereinafter referred to as receiver) that receives remote control signals transmitted from a remote control transmitter. The entire receiver is in operation.

However, when a battery is used as a power source for the receiver, it is not desirable to keep the entire receiver in constant operation because it shortens the life of the battery. Therefore, it is possible to intermittently apply power to the receiving circuit (the circuit that amplifies, detects, and shapes the waveform of the received remote control signal) that consumes a large amount of power in the receiver, and keeps the receiving circuit in an operating state for a short period of time. Proposals have been made to reduce power consumption (see, for example, Japanese Patent Laid-Open No. 62-269427).

In this case, the time for supplying power to the receiving circuit is equal to the sum of the rising time of the receiving circuit (the time from when power is applied until it is ready to receive remote control signals) and the receiving time of the remote control signal. or larger.

The rise time of a receiving circuit varies depending on the configuration of the receiving circuit, but is approximately determined by the time required for charging various capacitors provided in the receiving circuit to a predetermined voltage value.

For example, as shown in FIG. 5, in a conventional infrared remote control receiver RCV in which a receiving circuit 101 is configured using a receiving preamplifier integrated circuit (hereinafter referred to as receiving IC) 102,
The rise time from when the switching transistor 103 is turned on and the voltage of the battery 104 is applied to the receiving circuit 101 until the receiving circuit 102 can stably receive the infrared remote control signal received by the light receiving diode 105 is as follows. , a power supply stabilizing capacitor Cl0I connected to the power supply terminal Vcc of the reception IC 102, a capacitor ClO2 connected to the amplifier gain setting terminal IN- via a resistor, and a capacitor ClO3 connected to the detection capacitor connection terminal Cd are predetermined. This rise time is approximately determined by the time it takes to charge to the voltage value of
That's about it.

In FIG. 5, reference numeral 106 is a reception cycle control and reception data processing circuit (referred to as reception control/processing circuit) composed of a one-chip microcomputer or the like, and this reception control/processing circuit 106 and the switching transistor 103 These constitute a power supply switch means for turning on and off the power supply to the receiving circuit 101.

(Problem to be Solved by the Invention) Therefore, as shown in FIG. 6, with respect to the rise time t3 of the receiving circuit 101, the amount of data transmitted from the remote control transmitter (not shown) is relatively small, and the remote control signal cannot be received. If the time tR required to do this is much shorter (for example, several ff1S or less), the power consumption until the receiving circuit 101 reaches a stable operating state will be lower than the power required to actually receive the remote control signal. However, there was a strong need to improve the rise time of the receiving circuit.

The present invention has been made to solve these problems, and provides a remote control receiver that can receive remote control signals immediately after power is applied, thereby reducing power consumption in the receiving circuit. With the goal.

(Means for Solving the Problems) In order to solve the above problems, the wireless remote control signal receiver according to the present invention uses a capacitor that takes a long time from application of power to reach the voltage necessary for reception operation in the remote control signal reception circuit. It is characterized by being equipped with a quick charging means for rapidly charging the battery.

(Function) At the same time as voltage is applied to the remote control signal receiving circuit, the aforementioned capacitor is rapidly charged by the quick charging circuit,
The voltage required for reception operation is reached in a short time. Therefore, the remote control signal receiving circuit becomes in a stable receiving state in a short time.

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram of a wireless remote control signal receiver according to the present invention.

In the figure, 1 is a wireless remote control signal receiver (hereinafter referred to as receiver) that uses infrared rays;
, a remote control signal receiving circuit (hereinafter referred to as the receiving circuit) 2, a receiving cycle control/received data processing circuit (hereinafter referred to as the receiving control/processing circuit) 3, a battery 4, and a switching transistor (hereinafter referred to as the receiving circuit) for supplying power to the receiving circuit 2. (denoted as TR)5.
It is composed of a quick charging means 6.

The receiving circuit 2 includes a receiving preamplifier integrated circuit (hereinafter referred to as receiving IC) 20 and its peripheral circuit components.

The reception IC 20 has an amplifier, a limiter, a bandpass filter (BPF), a detection circuit, a waveform shaping circuit, etc. built into a single chip to amplify the infrared remote control signal received by the light receiving diode 7, and has Vcc.

GND is a power supply and GND terminal, IN+ is an input terminal for a remote control signal, and OUT is an output terminal after detection.

The power supply terminal Vcc of the reception IC20 is connected to the capacitor C1.
, and is connected to the collector of the switching transistor 5 via a power supply stabilizing circuit 21 consisting of a resistor R1.

A band pass filter (BPF) is connected to the frequency setting terminal fO.
) is connected to the center frequency setting resistor R2, and the integrating capacitor C2 is connected to the integrating capacitor terminal Ci of the detection output.
However, the detection capacitor C is connected to the detection capacitor terminal Cd.
3 are connected to each other. Amplifier gain setting terminal I
N- has a gain setting resistor R3 and a capacitor C.
4 series circuits are connected. The output terminal OUT of the reception circuit 2 is pulled up by a resistor R4 and connected to the input terminal IN of the reception control/processing circuit 3.

The reception control/processing circuit 3 is, for example, a low power consumption C-
It consists of a MOS 1-chip microcomputer, etc. Vcc and GND of the reception control/processing circuit 3 are the power supply and GND terminals, IN is the input terminal for the output signal of the reception circuit,
OUT'T is an output terminal for driving a controlled device (not shown) based on the signal input from the IN terminal, pow
C is an output terminal for a power switch signal that controls power supply to the receiving circuit, and CHRG is an output terminal for driving the quick charging means 6.

The output terminal powc of the power switch signal is connected to the base resistor R.
5 to the base of TR5, and a resistor R6 is connected between the base and emitter of TR5.

The quick charging means 6 includes TR6a, TR6a, which performs a switching operation based on a signal from the quick charge drive output terminal CHRG.
TR6b and TR6c which are driven by and perform switching operation, and a resistor a connected to the collector of TR6c.
d, 6e and 6f.

6g, two sets of voltage divider circuits, diodes 6h, 6i, and each TR6a, 6b, 6c for applying the voltage divided by the voltage divider circuits in the forward direction to the detection capacitor C3 and the gain setting capacitor C4, respectively. , base-emitter resistances 6j to 6o, and diodes sp and eq inserted between the collector of TR 6a and the base of each TR 6b and 8c.

The emitters of TR6b and 6c are connected to the positive terminal of battery 4, and the collector of TR8b is connected to capacitor C1 of power supply stabilization circuit 21.

In addition, the constants of the resistors 6d to 6g constituting the two sets of voltage dividing circuits are the same as those of the respective capacitors C4 and C at the rapid charging time t2, which will be described later.
The voltage No. 3 is set so that the receiving circuit 2 is in a stable receiving state.

FIG. 2 shows the powc terminal of the reception control/processing circuit 3.

5 is a time chart showing the output signal waveform of the CHRG terminal and the operation of the receiver.

The reception control/processing circuit 3 determines the duration time 10 (second
With a period t1 that is the same as or shorter than that in Figure a), the duration to
pow the power switch signal for a much shorter time t2 than
The output of the quick charging means drive signal (second
C) in the figure is configured to be output to the CHRG terminal.

Next, the operation of this embodiment will be explained.

TR5 is driven to the on state by the power switch signal shown in FIG. 2, and the voltage of the battery 4 is applied to the receiving circuit 2 during time t2 (FIG. 2d).

Furthermore, C) the quick charging means drive signal (second
As shown in FIG. C), TR8a is turned on for time t3, and TR6b and TR6c are also turned on for time t3.

When TR6b turns on, the power supply stabilizing capacitor C
The voltage of the battery 4 is applied to the capacitor C1, and this capacitor C1 is rapidly charged to approximately the voltage of the battery 4 (FIG. 2e).

When TR6c turns on, the voltage of the battery 4 is generated on the collector side of TR6b, and this voltage is divided by the resistors 6d and 6e and applied to the gain setting capacitor C4 via the diode 61. Resistance ad, 6e
is rapidly charged to a voltage based on the voltage divided by (
Figure 2 f).

Similarly, the voltage divided by resistors 6f and 6g is applied to diode 6.
h to the detection capacitor C3, and this capacitor C3 is rapidly charged (Fig. 2g).

As described above, the voltage of the battery 4 is applied to the receiving circuit 2, and the capacitors CI, C4, and C3 are rapidly charged to bring the receiving circuit 2 into a stable receiving state, so the voltage is applied as shown in the second diagram. Reception output can be obtained in a short time from

The reception control/processing circuit 3 determines the content of the remote control signal based on the cycle and pattern of the remote control signal received by the reception circuit 2, and outputs a signal to the output terminal OUT to drive a controlled device (not shown). This output is used to perform remote control operations. In this embodiment, the number of output terminals OUT is one, but a plurality of output terminals may be provided as necessary.

Moreover, since this embodiment is a method of asynchronously and intermittently receiving remote control signals (FIG. 2 a) transmitted from a remote control transmitter (not shown), a series of remote control signals including, for example, equipment codes and command codes or control codes, etc. When transmitting and receiving signals, the receiver does not necessarily receive the first code in the series. Therefore, the remote control transmitter transmits a series of remote control signals with the same content for a predetermined duration (see FIG.
0), it is necessary to repeat the transmission multiple times. The receiver temporarily stores the received code, etc., and then performs processing to determine the contents of the command, etc.

Next, another embodiment of the quick charging means will be described with reference to FIG.

FIG. 3 is a block diagram of a receiver 10 equipped with a quick charging means 60 different from the quick charging means 6 shown in FIG. 1, and the differences from FIG. 1 are as follows.

The power supply stabilizing circuit of the receiving circuit 2 is composed of only the capacitor C1, and the quick charging circuit for this capacitor C1 is omitted.

The quick charging means 60 turns on the TR 60c based on a time constant set by the resistor 60a and the capacitor 60b, and applies the voltage divided by the resistors 60d and 60e to the diode 6.
Capacitors C3 and C4 through 0h and 60i, respectively.
The emitter of TR60c is connected to the collector of TR5. Note that the series circuit of the diode 60f and the resistor Bog is for discharging the charge of the capacitor 60a through the receiving circuit 2 when the TR5 is turned off. Further, the resistor 60j is for pulling up the base of the transistor 60c.

With the above configuration, the pow of the reception control/processing circuit 3 is
The c terminal output (power switch signal) becomes L level, and T
When R5 is turned on and the voltage of battery 4 is applied to the receiving circuit, the emitter base of TR60c-resistor 60
The base current flows through the route of the a-capacitor Bob for a certain period of time, and TR60c is in an on state for a certain period of time. TR6
When 0c is turned on, the voltage of the Vcc power supply increases to the resistance 60d.

The voltage is divided by 60e, and the divided voltage is passed through diode 60h.
, 60i to each capacitor C4, C3,
Each capacitor C4, C3 is rapidly charged.

Therefore, the receiving circuit 2 can be brought into a stable operating state immediately after power is supplied.

Next, other embodiments of the present invention will be described.

FIG. 4 is a circuit diagram of a receiver in which the receiving circuit is composed of individual parts.

The receiver 70 shown in FIG. 4 is an operational amplifier ICI.

A receiving circuit 80 consisting of a two-stage configuration of IC2, a quick charging means 90, and a receiving control/processing circuit 3 having the same configuration as in FIG. Battery 4. It is composed of TR5.

The receiving circuit 80 is a general amplifier circuit, and only the portions related to the present invention will be described. A vCC power supply is applied to the light receiving diode 7 via a resistor 80a, and the output of the light receiving diode 7 is input to the first stage operational amplifier ICI via a coupling capacitor 80b.

TR5 is activated by the powc terminal output of the reception control/processing circuit 3.
is turned on and power supply Vcc is applied to the receiving circuit 80, the normal receiving state will not be achieved until the voltage value across the coupling capacitor aob reaches a steady state. is turned on for a certain period of time to charge the coupling capacitor 80b through the input resistor 80d without going through the feedback resistor 80c of the first stage operational amplifier ICI, thereby shortening the rise time.

Note that 90b in the quick charging means 90 is C1 (switching transistor (TR) for driving the TR 90a based on the output of the RG terminal, 90c).

90d, 90e, and 90f are each TR90a.

These are the base resistance and base-emitter resistance of 90b.

Although all of the embodiments have described wireless remote control signal receivers that use infrared rays, a configuration that uses quick charging means to shorten the rise time of the receiver is a remote control that uses ultrasonic waves or weak electric field radio waves. It can also be applied to signal receivers.

In addition to the switching means, the quick charging means may also be configured to charge each capacitor using a constant current circuit or the like.Furthermore, the voltage of the capacitor is detected by a voltage detection circuit and charging is started when the voltage of the capacitor reaches a predetermined voltage value. It may be configured to stop.

(Effects of the Invention) As explained above, the wireless remote control signal receiver according to the present invention intermittently supplies power to the receiving circuit, and is equipped with a quick charging means to maintain the voltage required for receiving operation from power application. Since the configuration is configured to quickly charge a capacitor that takes a long time to reach, the rise time of the receiving circuit can be significantly shortened.

Since the rise time of the receiving circuit has been shortened, the time required to supply power to the receiving circuit is approximately the time required to receive the remote control signal, and conventionally the power is supplied until the receiving circuit reaches a stable receiving state. It is possible to significantly reduce the amount of power consumed, and it is possible to operate the receiver for a long period of time on battery power or to downsize the receiver by using a small capacity battery.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram of a wireless remote control signal receiver according to the present invention, FIG. 2 is a time chart showing the operation of the receiver, and FIG. 3 is a receiver equipped with quick charging means different from that in FIG. 1. 4 is a block diagram of a receiver in which the receiving circuit is composed of individual parts, Figure 5 is a block diagram of a conventional wireless remote control signal receiver, and Figure 6 is a block diagram of the receiver shown in Figure 5. 3 is a time chart showing the operation of FIG. In addition, in the drawing, 1, 10.70 is a wireless remote control signal receiver (receiver), 2.80 is a remote control signal receiving circuit (reception circuit), and 3 is a reception cycle control/reception data processing circuit (reception control/processing circuit). ), 4 is a battery, 5 is a transistor (TR) constituting a power supply switch means, 6, 60 .
90 is a quick charging means, 7 is a light receiving diode, 20 is a receiving preamplifier integrated circuit (receiving IC), CI is a capacitor for stabilizing the Vcc power supply, C3 is a detection capacitor,
C4 is a capacitor for setting an amplifier gain, POWC is an output terminal for a power switch signal, and CHRG is a quick charging means drive output terminal.

Claims (1)

[Claims] In a wireless remote control signal receiver that intermittently receives remote control signals by controlling power supply to a remote control signal receiving circuit that performs amplification and detection of wireless remote control signals using a power supply switch means, this wireless remote control signal receiver is , comprising a quick charging means for quickly charging a capacitor that takes a long time from application of power to reach the voltage necessary for reception operation in the remote control signal receiving circuit, and starts supplying power to the remote control signal receiving circuit. A wireless remote control signal receiver characterized by shortening the rise time from start to stable reception.