JPH05135290A - Wireless transmitter for burglar preventing sensor - Google Patents

Abstract

PURPOSE:To prolong the life of the battery of a wireless transmitter for a sensor of a normally-closing contact type. CONSTITUTION:A sensor circuit part S is constituted by connecting a current detecting circuit 1 to a normally-closing type operation contact SW of the contact type burglar preventing sensor in series. A pulse generating circuit part 2 supplies the sensor circuit part S with the intermittent pulse signal of prescribed cycle as a monitoring signal and a discrimination part 3 detects a current variation generated in a current detecting circuit 1 in accordance with variation of an operation contact SW to discriminate the information transmission of the burglar preventing sensor so as to operate a wireless transmission part when information transmission is discriminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a wireless transmitter for a security sensor, which is added to a contact-type security sensor and transmits a warning signal of the security sensor as a radio signal.

[0002]

2. Description of the Related Art Recently, a wireless transmitter 10 as shown in FIG. 14 has been added to a contact type security sensor having a magnet attached to a window or the like and provided with an operation contact for opening / closing according to the opening / closing position of the window.
When 0 is added and the wireless security system issues a warning signal, the wireless transmitter 100 sends a weak radio signal to the wireless receiver 101 to monitor the open / closed state of the window. It has arrived.

FIG. 15 shows such a wireless crime prevention system in which a signal processing unit 200 is added to a normally closed contact type crime prevention sensor SW, and the signal processing unit 200 composed of a one-chip microcomputer is used for crime prevention. Resistance element 20 that constitutes the operating contact SW of the sensor and the current detection circuit 1
1, the sensor circuit section S is additionally connected, and the change in the current generated in the current detection circuit 1 is discriminated according to the operation of the operation contact SW, so that the operation of the security sensor can be confirmed. Then, the driving power from the battery E is input to such a signal processing unit via the power input terminal VDD, and a control signal necessary for each unit of the wireless transmission unit 300 is sent to the one-chip microcomputer. The radio signals are output from the antennas 300a and 300b. However, according to such a wireless transmitter, when the security sensor having the normally closed operation contact SW is used, the sensor circuit unit S is constantly supplied with current from the power source Vo during monitoring. , The current consumption in the signal processing unit is increased, and the life of the battery E is shortened,
It is a factor that reduces the reliability of the wireless security system.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been developed in view of such circumstances, and a wireless transmitter for a contact type security sensor according to the present invention reduces current consumption during monitoring, and a security system due to battery exhaustion. It is intended to improve the deterioration of reliability.

[0005]

A wireless transmitter for a security sensor according to the present invention proposed to achieve the above object includes a wireless transmitter for a security sensor having the following configuration. That is, all of the wireless transmitters for crime prevention sensors proposed in claims 1 to 4 are used by connecting a crime prevention sensor having a normally-closed contact type operation contact, and in claim 1, the crime prevention The sensor circuit unit including the operating contact of the sensor is configured to reduce the current consumption by outputting a pulse signal of a predetermined cycle at the time of monitoring.
A pulse generator circuit unit that supplies a pulse signal of a predetermined cycle to the sensor circuit unit, and a determination unit that detects a change in the current that occurs in the current detection circuit during monitoring and determines whether or not a crime prevention sensor has issued a warning 1 It is built in the chip microcomputer. The present invention proposed in claim 3 proposes a wireless transmitter for a crime prevention sensor, which has a determination unit for performing a soft processing on a current change generated in a current detection circuit at the time of monitoring to determine an alarm. Further, in claim 4, there is proposed a wireless transmitter for a crime prevention sensor, which is configured to drive a one-chip microcomputer with a low-frequency reference clock during monitoring and with a high-frequency reference clock during data transmission after a determination is made.

On the other hand, in claims 5 to 8, a wireless transmitter for a security sensor is proposed, which has an input mode setting switch for selectively setting the type of the security sensor to be connected. A wireless transmitter for a security sensor is proposed, in which a monitoring signal to be supplied is configured to be switched and switched between a normally closed contact type security sensor and a normally open contact type security sensor.
When the normally closed contact type security sensor is connected by the input mode setting switch, an intermittent pulse is supplied to the sensor circuit section at a predetermined cycle during monitoring, and when the normally open contact type security sensor is connected by the input mode setting switch, At the time of monitoring, the sensor circuit unit is configured to be supplied with a signal of a constant level. Further, in claim 7, regardless of whether the crime prevention sensor set by the input mode setting switch is a normally closed contact type or a normally open contact type, an intermittent pulse signal having a predetermined cycle is supplied to the sensor circuit unit during monitoring. However, the determination unit that determines the presence / absence of an alarm based on the current change of the current detection circuit switches the execution of different determination programs according to the type of crime prevention sensor set by the input mode setting switch to determine the alarm. It is configured to do. The present invention proposed in claim 8 is such that the signal processing unit of the wireless transmitter for a crime prevention sensor proposed in claim 5 is configured by a one-chip microcomputer.

[0007]

The wireless transmitter for a security sensor of the present invention has the following actions. That is, claim 1
According to the present invention proposed in any one of claims 4 to 4, since the monitoring signal supplied to the sensor circuit unit at the time of monitoring is a pulse signal, the current consumption of the battery is reduced even when the normally closed contact type security sensor is connected. .. Particularly, in the invention proposed in claim 4, the low frequency reference clock circuit which consumes a small amount of current is activated during monitoring, and the high frequency reference clock circuit which consumes a large amount of current and is required for data transmission only at the time of alarm determination. Therefore, the current consumption as a whole is reduced. According to the present invention proposed in claims 5 to 8, the monitoring signal supplied to the sensor circuit portion during monitoring is automatically changed according to the type of the security sensor to be connected.
Further, particularly in the present invention proposed in claim 6, when the connected crime prevention sensor uses a normally open type contact as an operation contact, a signal of a constant level is supplied, and the sensor circuit unit at the time of monitoring. Since no current flows through the device, the current consumption is further reduced. On the other hand, if the connected security sensor uses a normally closed contact as an operating contact, an intermittent pulse signal is supplied, so the current consumption is significantly reduced compared to the conventional one in which a constant level signal was sent. ..

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 are views for explaining a normally closed contact type wireless transmitter for a crime prevention sensor. FIG. 1 is a block diagram showing an internal configuration of a signal processing unit which is a main part of a wireless transmitter for a security sensor of a normally closed contact type. The signal processing unit A includes a pulse generating circuit unit 2, a discriminating unit 3, and a power supply circuit 5.
The pulse generation circuit section 2 is connected to the operation contact SW of the security sensor, and the operation contact SW is connected in series with the current detection circuit 1 composed of a resistance element whose one end is grounded. 1 is connected to the determination unit 3. The sensor circuit section S is configured by connecting the normally closed operation contact SW of the security sensor and the current detection circuit 1 in series, and the power supply circuit 5 is a battery E provided outside the signal processing section A.
More drive power is being supplied. The pulse generation circuit section 2 is operated by the CPU incorporated in the signal processing section A,
While the intermittent pulse signal (voltage) of a predetermined cycle is supplied as a monitoring signal to the operation contact SW of the security sensor of the sensor circuit section S, the discrimination section 3 detects the current change occurring in the current detection circuit 1 and outputs the security sensor. When the alarm is detected and the alarm is determined, the data necessary for alarm notification is sent to the wireless transmission unit 6, the wireless transmission unit 6 is operated, and the radio signals of the antennas 6a and 6b are transmitted. It is configured to send in the form.

The signal processing unit A having such a configuration can be configured by a one-chip microcomputer, and FIG. 2 shows an internal configuration of the wireless transmitter for a security sensor in that case. Next, referring to FIG. 2, the structure of the wireless transmitter for the security sensor of the present invention will be described.
The signal processing unit A is composed of a one-chip microcomputer, and the signal processing unit A includes the pulse generation circuit unit 2 and the discrimination unit 3 described above, and the monitoring signal from the pulse generation circuit unit 2 outputs Po1. The output of the terminal / current detection circuit 1 is input to the determination unit 3 via the Po2 input terminal.
Further, a battery E is connected to the VDD terminal and a power supply voltage is supplied from the battery E, and the wireless transmitter 6 outputs a drive signal from the signal output terminal S to the oscillation circuit 61 and the multiplication circuit 62. The necessary alarm data is transmitted from the D terminal. Here, the report data is composed of, for example, 32-bit digital data.
In the bit data, the ID code of the wireless transmitter,
The alarm signal is included. When the wireless transmission unit 6 is operated, the driving signals are alternately output from the antenna terminals ANT1 and ANT2 to the polarization diversity antennas 6a and 6b.
In order to perform these signal processing, the main clock generating circuit MC for generating the high frequency reference clock necessary for data transmission by the CPU is provided. Note that SC is a sub clock generation circuit SC that generates a low-frequency reference clock for supplying a pulse signal of a predetermined cycle to the sensor circuit unit S.
Is.

According to the present invention, when the wireless transmitter is monitored, the sub-clock generating circuit SC is operated because the pulse signal of the predetermined cycle is supplied to the sensor circuit section S, but the discriminating section 3 notifies the security sensor of the alarm. When the determination is made, the main clock generation circuit MC is activated and the CP in the signal processing unit A is
U executes the control program necessary for transmitting the report data. In such a wireless transmitter of the present invention, when the wireless transmitter is monitored, a pulse signal of a predetermined cycle is output from the output terminal Po1, and the signal output terminal S does not output a drive signal at this time, so the wireless transmitter 6
Is not activated. Therefore, as for the current consumption of the battery E, as shown in FIG. 4, the sensor current Is flows intermittently only when the pulse signal is supplied, but the operation contact SW of the security sensor is opened and the discrimination unit 3 generates the current. When the information is discriminated, in addition to the output of the pulse signal of the predetermined cycle from the output terminal Po1, the main clock generating circuit MC is driven, and the wireless transmission unit 6 is operated by the drive signal generated from the signal output terminal S. Therefore, the current consumption of the battery E increases as indicated by Iw in FIG.

Steps 100 to 105 of FIG. 3 are flow charts showing the alerting discrimination operation in the signal processing section of the wireless transmitter for a security sensor of the present invention shown in FIG. ) Is a time chart showing the operation of each unit of the signal processing unit in association with changes in the current consumption of the battery. As shown in these figures, when the wireless transmitter of the present invention is in the monitoring state, a pulse signal of a predetermined cycle is output from the output terminal Po1,
At this time, the operation contact SW of the security sensor is closed (O
N), a pulse signal is generated at the input terminal Po2. Therefore, in such a sensor circuit section S, when the security sensor issues a warning and the operation contact SW opens, the pulse signal to be detected by the determination section 3 is interrupted, so the determination section 3 receives the pulse signal from the input terminal Po2. Each time it is executed, if a program that resets the timer that sets the preset time to the predetermined time T is executed, and if it is determined that the pulse signal has been interrupted only during the preset time T, the crime prevention sensor issues a warning. Can be determined (step 1 in FIG. 3)
00-105).

According to the present invention as described above, the ratio of the current t1 flowing through the sensor circuit portion S to the pulse period t2 at the time of monitoring that the operation contact SW of the normally closed contact type security sensor is closed is set to 1:10. By doing so, the sensor current Is can be suppressed to 1/10 as compared with the conventional normally-closed contact type security sensor, and the standby current during monitoring is significantly reduced. Figure 5
FIG. 13 illustrates a wireless transmitter for a security sensor to which either a normally closed security sensor or a normally open security sensor can be connected.

FIG. 5 is a block diagram showing an internal configuration of the signal processing unit corresponding to FIG. 1, and FIG. 6 is a configuration diagram of an internal circuit in which the signal processing unit B is constituted by a one-chip microcomputer. The pulse signal generating circuit section 2 is replaced with a supervisory signal generating circuit section 2a. The parts corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals and their description is omitted. In the present invention, the input mode setting switch 7
Is provided and the type of the security sensor to be connected is selected and set, the monitoring signal generating circuit section 2a outputs monitoring signals of different patterns to the sensor circuit section S. As the pattern type of such a supervisory signal, those proposed in claims 6 and 7 are appropriately adopted.

That is, in the wireless transmitter proposed in claim 6, when the normally closed contact type security sensor is connected by the input mode setting switch 7, the sensor circuit section S is supplied with an intermittent pulse of a predetermined cycle during monitoring. Then, when the normally open contact type security sensor is connected by the input mode setting switch 7, a signal of a constant level is supplied to the sensor circuit section S during monitoring. On the other hand, in claim 7, regardless of whether the crime prevention sensor set by the input mode setting switch 7 is a normally closed contact type or a normally open contact type, an intermittent pulse signal of a predetermined cycle is sent to the sensor circuit section S during monitoring. However, the discriminating unit 3 for discriminating the presence / absence of the alarm based on the current change of the current detection circuit 1 switches and executes different determination programs depending on the type of the security sensor set by the input mode setting switch 7. It is designed to discriminate between reports.

In the present invention as described above, when the security sensor to be connected has a normally closed type operating contact, if the input mode setting switch 7 is set to NC type, the supervisory signal generating circuit section is provided. When the sensor circuit section S is supplied with an intermittent pulse signal of a predetermined cycle from 2a and the security sensor to be connected has a normally open type operation contact, the input mode setting switch 7 is set to NO type. if,
A signal of a constant level is supplied from the monitoring signal generation circuit section 2a to the sensor circuit section S (step 2 in FIG. 7).
00-202). When the input mode setting switch 7 is set to the NC type, the determining unit 3 performs the alarm determination when a predetermined number of pulse signals to be detected by the current detecting circuit 1 are missing. Step 300 of FIG.
˜305 and a) to d) of FIG. 11 describe the basic operation in this case, and the determination unit 3 determines the time equivalent to the lack of a predetermined number of pulses when setting the time of the timer. It is defined as a set time T, and if the current detection circuit 1 detects a pulse signal within this set time,
The normally-closed contact type security sensor determines that the alarm has not been issued, and conversely, if the current detection circuit 1 does not detect a pulse signal within the set time T, it determines that the alarm has been issued.

On the other hand, when the input mode setting switch 7 is set to the NO type, the discriminating section 3 makes a report discrimination when the current detecting circuit 1 detects the rising signal for a predetermined time. Steps 400 to 402 in FIG. 9 and a) to FIG.
FIG. 3D) illustrates an example of the operation in this case. The determination unit 3 constantly monitors the current detection circuit 1 and the current detection circuit outputs a rising signal for a predetermined time T ′ (for example, 100 m).
sec) It is determined that the alarm was issued when it was detected.

In claim 7, the proposed invention is
Regardless of whether the crime prevention sensor set by the input mode setting switch 7 is a normally closed contact type or a normally open contact type, an intermittent pulse signal of a predetermined cycle is supplied to the sensor circuit section S during monitoring, but current detection is performed. The discriminating unit 3 for discriminating the presence / absence of an alarm based on a change in the current of the circuit 1 has a configuration for discriminating an alarm by executing different determination programs depending on the type of the security sensor set by the input mode setting switch 7. ing. With such a configuration, the control circuit can be simplified because the sensor circuit section S is configured to supply the intermittent pulse signal regardless of the type of the sensor.

Since the operation when the normally closed contact type security sensor is connected is the same as that shown in FIGS. 8 and 11,
The operation when the normally-open contact type security sensor is connected will be described. FIG. 10 is a determination operation of the determination unit 3, and a) to d) of FIG. 13 are time charts illustrating the operation of each unit. In FIG. 13, Io indicates a current level necessary for the signal processing unit B to operate, and Ia indicates a current level consumed in the signal processing unit B for intermittently outputting the pulse signal. In such a configuration, the supervisory signal generation circuit unit 2
When a pulse signal is supplied from a to the sensor circuit section S, the number of pulses generated in the current detection circuit is counted,
When the count value reaches a predetermined number, it is determined that a normally open contact type security sensor is issued.

[0019]

The wireless transmitter for a security sensor of the present invention has the following effects. That is, in the present invention proposed in claims 1 to 4, since the intermittent pulse signal is supplied to the sensor circuit portion during monitoring, the current consumption of the battery is reduced even when the normally closed contact type security sensor is connected. Since the battery capacity can be made small, the battery life can be reduced and the troublesome maintenance due to running out of the battery can be reduced. In the present invention proposed in claims 5 to 8, the monitoring signal supplied to the sensor circuit portion during monitoring is automatically switched and changed according to the type of the crime prevention sensor to be connected, and in particular, it is proposed in claim 6. According to the present invention, when the connected security sensor uses a normally open contact as an operating contact, current does not flow in the sensor circuit portion during monitoring, so that current consumption is further reduced and the connected security sensor is connected. When the normally closed contact is used as the operating contact, an intermittent pulse signal is supplied to the sensor circuit portion, and the current consumption is significantly reduced as compared with the conventional one.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of a signal processing unit of a wireless transmitter for a normally closed contact type security sensor according to the present invention.

FIG. 2 is a block diagram showing an internal configuration of a wireless transmitter for a normally closed contact type security sensor of the present invention.

FIG. 3 is a flowchart showing a report determination operation in a determination unit.

FIG. 4 is a time chart showing an operation of a main part of the wireless transmitter for a normally closed contact type security sensor of the present invention.

FIG. 5 is a block diagram showing a main configuration of a signal processing unit of the wireless transmitter for a contact type security sensor of the present invention having an input mode setting switch.

FIG. 6 is a block diagram showing an internal configuration of a wireless transmitter for a contact type security sensor of the present invention having an input mode setting switch.

FIG. 7 is a flowchart showing a monitoring signal setting operation in the wireless transmitter for a contact type security sensor of the present invention having an input mode setting switch.

FIG. 8 is a flowchart showing an alarm determination operation of a determination unit when a normally closed contact type security sensor is connected to the contact type security sensor wireless transmitter of the present invention having an input mode setting switch.

FIG. 9 is a flow chart showing a report determination operation of a determination unit when a normally open contact type security sensor is connected to the contact type security sensor wireless transmitter of the present invention having an input mode setting switch.

FIG. 10 is a flow chart showing a report determination operation of a determination unit when a normally open contact type security sensor is connected to the contact type security sensor wireless transmitter of the present invention having an input mode setting switch.

FIG. 11 is a time chart showing a basic operation when a normally closed contact type security sensor is connected to the wireless transmitter for a contact type security sensor of the present invention having an input mode setting switch.

FIG. 12 is a time chart showing a basic operation when a normally open contact type security sensor is connected to the wireless transmitter for contact type security sensor of the present invention having an input mode setting switch.

FIG. 13 is a time chart showing a basic operation of another example when a normally open contact type security sensor is connected to the contact type security sensor wireless transmitter of the present invention having an input mode setting switch.

FIG. 14 is an explanatory diagram of a wireless transmitter for a crime prevention sensor.

FIG. 15 is a configuration diagram of an internal circuit of a conventional wireless transmitter for a security sensor.

[Explanation of symbols]

 A, B ... Signal processing unit S ... Sensor circuit unit 1 ... Current detection circuit 2 ... Pulse generation circuit unit 2a ... Monitoring signal generation circuit unit MC ... Main clock generation circuit SC ..Sub clock generation circuit 6 ... Wireless transmission unit

Claims (8)

[Claims] 1. A current detection circuit is connected in series to an operating contact of a normally closed contact type security sensor, and when a change in current generated in the current detection circuit is detected, a warning signal is transmitted from a wireless transmission unit in the form of a radio wave signal. In a wireless transmitter for a security sensor with a built-in battery that is configured to output, a sensor circuit section configured by connecting a current detection circuit in series to the normally closed operation contact of the contact type security sensor, and a monitoring signal to this sensor circuit section. As a pulse generation circuit section that supplies an intermittent pulse signal for a predetermined period, and a current change that occurs in a current detection circuit in response to a change in the operating contact is detected to determine the alarm of the security sensor, and the wireless transmission section. A wireless transmitter for a crime prevention sensor, which is configured to include a discrimination unit that activates. 2. The pulse generating circuit section and the discriminating section are built in a one-chip microcomputer which constitutes a signal processing section, and are configured to receive power supply from a battery.
Wireless transmitter for crime prevention sensor described in. 3. The pulse generation circuit section intermittently outputs a pulse signal of a predetermined cycle, and the discrimination section discriminates an alarm when a predetermined number of pulse signals to be detected by the current detection circuit are omitted. The wireless transmitter for a crime prevention sensor according to claim 1 or 2, which is configured to perform an operation. 4. The one-chip microcomputer comprises:
A main clock generation circuit for generating a high frequency reference clock for data transmission by the CPU when the wireless transmission unit is activated, and a sub clock for generating a low frequency reference clock for operating the pulse generation circuit unit during monitoring. 3. The security sensor according to claim 2, further comprising: a generation circuit, wherein the main clock generation circuit is not driven during monitoring, but is driven for data transmission when the determination unit determines an alarm. For wireless transmitter. 5. A configuration in which a current detection circuit is connected in series to an operation contact of a security sensor, and when a change in current generated in the current detection circuit is detected, a wireless transmission unit outputs a warning signal in the form of a radio wave signal. In the wireless transmitter for security sensor with built-in battery, which should be connected, the type of security sensor to be connected is selected from the normally closed contact type and the normally open contact type A monitoring signal generation circuit section that outputs a monitoring signal according to the security sensor, and a current change that occurs in the current detection circuit according to the change of the operating contact of the connected security sensor is detected and the alarm detection of the security sensor is determined, A wireless transmitter for a crime prevention sensor, which is configured to include a determination unit that operates the wireless transmission unit. 6. When the input mode setting switch is a normally closed contact type security sensor, the monitoring signal generating circuit section outputs an intermittent pulse signal of a predetermined cycle, while the judging section detects the current detecting circuit. When a predetermined number of pulse signals to be detected by the sensor are omitted, and the input mode setting switch is a normally open contact type security sensor, the monitoring signal generating circuit section is The contact-type crime prevention sensor according to claim 5, wherein while the signal of a constant level is output, the determination unit is configured to determine an alarm when a signal of a predetermined level is detected by the current detection circuit for a predetermined time. Wireless transmitter. 7. When the input mode setting switch is a normally closed contact type security sensor, the monitor signal generating circuit section outputs an intermittent pulse signal of a predetermined cycle, while the discriminating section outputs the current detecting circuit. When a predetermined number of pulse signals to be detected by the detection of the alarm is discriminated, and the monitoring signal generation circuit unit, if the input mode setting switch is a normally open contact type security sensor, The monitoring signal generating circuit section outputs an intermittent pulse signal of a predetermined cycle, while the discriminating section discriminates an alarm when a predetermined number of pulse signals are detected by the current detecting circuit. Wireless transmitter for the contact-type security sensor described. 8. The monitor signal generating circuit section and the discriminating section are built in a one-chip microcomputer constituting a signal processing section, and are configured to receive power supply from a battery. Wireless transmitter for crime prevention sensor.