JPH0612481B2 - Infrared reception control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared reception control device for remotely receiving an infrared signal and turning on / off a load operation according to the content of the control signal.

2. Description of the Related Art Conventional reception control devices of this type turn on / off the operation of a load according to the contents of an infrared control signal from an external transmission device,
Until the new control signal is received, the load is kept on / off based on the contents of the previous control signal.

Problems to be Solved by the Invention In the conventional configuration, if the external transmitter is always normal, the operation of the load remotely controlled by it is stable,
And safe, but if the external transmitter is turned off, no new infrared signal will be transmitted anymore, and as a result, the load's operation will continue to its previous state and lose its control function. In some cases, it becomes unsafe operation,
Alternatively, it consumes unnecessary power. In addition, there is a problem that the same state occurs when the transmitting device fails and cannot transmit a normal infrared signal.

Means for Solving the Problems In order to solve this conventional problem, the infrared receiving device of the present invention is designed so that when an infrared signal from an external transmitting device is received periodically (for example, every 2 minutes). , The operating state of the load is turned on / off according to the control signal, and if the predetermined value cannot be received for a predetermined time (for example, 6 minutes), the load is forcibly turned off regardless of the operating state up to that point. It intends to configure the means to do.

Action Even if the operation of the external transmitter is stopped (power is turned off or the device is stopped due to a failure, etc.) by the above-described means, the reception controller that depends on the transmitter is then set to a certain output state (especially on). It acts to prevent dangerous or wasteful power consumption in the situation.

Embodiment An infrared reception control device according to the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings.

FIG. 1 is a circuit configuration diagram of an infrared reception control device of the present invention. In the figure, 1 is a plug for connecting to a commercial power supply, 2 is a protective fuse, 3 is a DC power supply circuit,
Generates DC power supply voltages Vcc and V _NR . Reference numeral 4 is a control unit (here, a microcomputer), 5 is equipment identifying means for identifying the type of equipment, 6 is a signal from the equipment identifying means 5, and a pulse signal Sp is input, and its pulse train is An input determination unit that determines whether or not the value is a predetermined value, 7 is a signal output unit that issues a control output signal Sc to the outside of the control unit 4 in response to a signal from the input determination unit, 8 is an initialization unit, and 9 is a time counting unit. When the input determination section 6 determines that the normal pulse signal Sp has been received, the initialization means 8 issues an output to the timer 9 and resets the counting time of the timer 9 to the initial value. Reference numeral 10 is a forced-off means, which detects that the timer 9 has counted up to a predetermined time, and then controls the output operation of the signal output unit 7 so that the control output signal Sc is turned off regardless of the signal of the input determination unit 6. To control.

Reference numeral 11 is a receiver for receiving an infrared signal Si from the outside, 1
Reference numeral 2 denotes a light receiving element (two), and the receiving unit 11 selects and demodulates a signal modulated at a predetermined carrier frequency in the infrared signal, and outputs it to the control unit 4 as a pulse signal Sp.

Reference numeral 13 is a changeover switch (mode selecting means), which is a contact
(a), (b), (c), and when the contact (a) is selected, a high level device selection signal Sn is issued to the device identification means 5 of the control unit 4. In the case of the contact point (b) (as in the case of the contact point (c)), the device selection signal Sn is at the low level. This signal S
By setting n to high and low, for example, the control target devices become a ventilation fan and a humidifier, respectively. Reference numeral 14 is a switch means, which includes resistors 15 and 16, a transistor 17, a relay 18, a contact 19 of the relay 18, a resistor 20, and a display element 2.
It consists of 1. The input signal is the control output signal Sc and a signal S _H to the high level when the changeover switch 13 is selected to contact (c). This signal _SH is a continuous ON signal, and when it is at a high level, the relay 18 is turned on and its contact 19 is closed regardless of the control output signal Sc. If the continuous ON signal _SH is not at high level, the control output signal S
The relay 18 is turned on / off according to c. Display element 21
Turns on and off in synchronization with the on / off operation of the relay 18.

Reference numeral 22 denotes an output outlet, which energizes a load connected to the contact 19 of the relay 18 when the contact 19 is closed.

Next, the pulse signal Sp is received by the receiving unit 11 and is received.
Is determined by the input determination unit 6 of the control unit 4 to be a normal value for the pulse train.
It is given in the format shown. In the figure, H is a header for indicating the start of transmission, D is 8-bit device control data (D0 to D7), C is a 5-bit control instruction, is a D-bit inverted signal, and is a C-inverted bit. It is a signal.
And are provided for error detection. Bits Dφ to D7 of D are provided corresponding to eight kinds of devices, respectively. Now, in FIG. 1, among them, D0 (humidifier) and D
₁ (ventilation fan) is used, and D2 to D7 are unused.
Each bit of the device control data D has two values of high and low, and it is defined to specify ON when the target device is high and OFF when the target device is low. Further, the control instruction C is composed of a specific 5-bit code, and if the 5 bits are C0 to C4, specific 5 bits, for example, "01000" are assigned.

That is, the pulse train shown in FIG. 2 is the device control data (D0
To D7) are 8-bit control commands C (C0 to C4) are 5-bit so-called 13-bit codes. Of these 13 bits, the control command C is only the above-mentioned specific 5-bit "01000". Used for.

The code of the control command C other than the above code prevents the device from malfunctioning even if it is specified for other uses, for example, an air conditioner other than the device or an infrared wireless remote control of AV equipment. On the contrary, on the contrary, the infrared signal of the control command C consisting of the specific 5 bits issued by this device does not affect the other. That is, the control command C has a specific 5-bit code and is distinguished from the code for remote control for other purposes.

Therefore, now when the changeover switch 13 is in the contact (a) state,
Since Sn = high, D1 (ventilation fan) is selected as the target device. At this time, the input determination unit 6 determines that the input pulse train has the format shown in FIG.
Is a specific value, the value D1 (high or low) is output to the signal output unit 7.

If the changeover switch 13 is in the state of the contact (b) (the same applies to the state of the contact (c)), Sn = low, which means that D0 (humidifier) is selected as the target device. , D0 (high or low) to the signal output unit 7.

Here, if the input pulse train does not follow the format shown in FIG. 2, or if there is an error in the error detection using, or if C is not a specific value, this pulse train has a predetermined value. Is considered not to have received an infrared signal, and as a result, the control output signal Sc is not changed.

Next, the initialization means 8 initializes the timer 9 when the external transmission device emits an infrared signal, for example, every 2 minutes or less and the input determination unit 6 determines that the pulse train has a predetermined value. To do. However, if this initialization is not performed for a predetermined time (for example, 6 minutes, that is, the number of times of reception is 3 or more under normal conditions), the forced output means 10 turns off the control output signal Sc. That is,
In addition to the operation of the external transmission device being stopped, if external noise makes it impossible to normally remotely control the load due to malfunction of the external transmission device or the receiving unit 11,
Even if the load is in the on state until then, it can be turned off after a predetermined time.

Next, FIG. 3 shows an external view of the embodiment shown in FIG. In the figure, 23 is a housing, 24 is an optical filter provided in front of the two light receiving elements of the receiving unit 11 (although they are provided toward the front surface and the lower surface in the figure),
Reference numeral 25 denotes a pair of plug blades of the plug 1, which are portions to be inserted into an outlet provided on the wall, and the device can be attached only by inserting into the outlet. Further, the pair of plug blades 25 has a structure capable of rotating at least 90 ° with respect to the main body of the plug 1. Reference numeral 26 is a rotation stopper, and the housing 23
When the rotation stopper 26 is removed from the housing 23, the pair of blades of the plug 1 can be rotated 90 ° upward in the drawing. In this state, an outlet for the extension power cord is inserted into the pair of plug blades 25, and the housing 23 is installed at an appropriate position on the wall by using a mounting bracket (not shown). it can. Therefore, it is effective when the outlet portion provided on the wall cannot be attached in terms of space or when the infrared signal cannot be normally received. Reference numeral 27 is a protrusion for stably holding the wall when it is inserted into a wall outlet.

As described above, the infrared reception control device of the present invention comprises the receiving unit, the control unit, and the switching means, and the control unit initializes the timer every time the pulse train from the receiving unit has a predetermined normal value. And a forced-off means for forcibly turning off the control output signal to the switch means when the timer reaches a predetermined time. If transmission stops, or if a malfunction occurs due to external noise in the receiver, it is prevented to keep the load particularly in the ON state in an uncontrollable state, and the load is reliably turned off after a certain period of time to avoid danger. The prevention and energy saving can be improved, and the effect can be expected to be great.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an infrared reception control device in an embodiment of the present invention, FIG. 2 is a format explanatory diagram of an infrared signal in FIG. 1, and FIG. 3 is an external view in FIG. 1 ... Plug, 3 ... DC power supply circuit, 4 ... Control section (microcomputer), 5 ... Device identification means, 6 ... Input determination section, 7 ... Signal output section, 8 ... Initialization means, 9 ...... Timer, 10 ...... Forced-off means, 11 ...... Reception part, 12 ...... Light receiving element, 13 ...... Changeover switch (mode selection means), 14 ...... Switch means, 18 ...... Relay, 21 ...... Display element , 22 ... Output outlet, Sc
...... Control output signal.

Claims (1)

[Claims] 1. A receiving unit for detecting an infrared signal and selecting / demodulating a signal modulated at a predetermined carrier frequency; and a pulse signal from the receiving unit, and when the pulse train has a predetermined value, The control unit emits a control output signal that is turned on or off according to the content, and a switch unit that turns on and off the power supply to the load according to the on / off state of the control output signal. A timer to count,
A means for initializing the timer when it is determined that the pulse train from the receiving unit has a predetermined value, and a forced off for turning off the control output signal when the timer reaches a predetermined time, regardless of the state until then. And an infrared ray reception control device including the means.