JP2900094B2 - Wireless transmitter for security sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a wireless transmitter for a security sensor which transmits an alarm signal of the security sensor as a radio signal in addition to a contact type security sensor.

[0002]

2. Description of the Related Art Recently, a wireless transmitter 10 as shown in FIG. 14 has been attached to a contact-type security sensor having a magnet attached to a window or the like and provided with operating contacts that open and close according to the open / close position of the window.
With the addition of 0, a wireless security system in which a weak radio signal is transmitted from the wireless transmitter 100 to the wireless receiver 101 when the security sensor issues an alarm to monitor the open / close state of the window has been developed and used. It has come.

FIG. 15 shows a wireless security system in which a signal processing unit 200 is added to a normally closed contact type security sensor SW. The signal processing unit 200, which is composed of a one-chip microcomputer, has a security function. The operating contact SW of the sensor and the resistance element 20 constituting the current detection circuit 1
1, the sensor circuit unit S is additionally connected, and a change in current generated in the current detection circuit 1 according to the operation of the operation contact SW is determined, so that the operation of the security sensor can be confirmed. The driving power from the battery E is input to the signal processing unit via the power input terminal VDD, and a control signal necessary for each unit of the wireless transmission unit 300 is transmitted to the one-chip microcomputer. , And output a radio signal from the antennas 300a and 300b. However, according to such a wireless transmitter, when a security sensor having a normally closed operation contact SW is used, a current is constantly supplied from the power supply Vo to the sensor circuit unit S during monitoring. , The current consumption in the signal processing unit increases, and the life of the battery E decreases,
This is a factor that reduces the reliability of wireless security systems.

[0004]

SUMMARY 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 provides a security system for running out of batteries. This is to improve the decrease in 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, the wireless transmitter for a security sensor proposed in claim 1 is used by connecting a security sensor having a normally closed contact type operation contact, and a sensor circuit unit including the operation contact of the security sensor. In monitoring, the current consumption is reduced by outputting a pulse signal of a predetermined period at the time of monitoring, and the discriminator is monitored at a low frequency reference clock at the time of monitoring, and at the time of data transmission after the alarm determination, at a high frequency reference clock. There has been proposed a wireless transmitter for a security sensor that is driven.

On the other hand, claims 2 to 5 propose a security transmitter wireless transmitter having an input mode setting switch for selecting and setting the type of the security sensor to be connected. A wireless transmitter for a security sensor has been proposed in which a monitoring signal to be supplied is switched and changed by 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 unit at a predetermined period during monitoring, and when the normally open contact type security sensor is connected by the input mode setting switch, At the time of monitoring, a constant level signal is supplied to the sensor circuit unit. In addition, in the case where the security sensor set by the input mode setting switch 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 during monitoring. However, the determination unit that determines the presence / absence of an alert based on a change in current of the current detection circuit switches and executes a different determination program according to the type of the security sensor set by the input mode setting switch to determine the alert. Configuration. In the present invention proposed in claim 5, the signal processing section of the wireless transmitter for security sensor proposed in claims 2 to 4 is configured by a one-chip microcomputer.

[0007]

According to the wireless sensor transmitter for security sensor of the present invention, the following effects are obtained. That is, claim 1
In the present invention proposed in the above, since the monitoring signal supplied to the sensor circuit unit at the time of monitoring is a pulse signal, even when a normally closed contact type security sensor is connected, the current consumption of the battery is reduced, At the time of monitoring, the low-frequency reference clock circuit consuming a small amount of current is operated, and the high-frequency reference clock circuit, which is necessary for data transmission and consumes a large amount of current only at the time of alarm determination, is operated, so that the overall current consumption is reduced. In the present invention proposed in claims 2 to 5, the monitoring signal supplied to the sensor circuit unit at the time of monitoring is automatically switched and changed according to the type of the security sensor to be connected. Further, in the present invention proposed in claim 3 in particular, when the connected security sensor uses a normally open contact as an operating contact, a signal of a certain level is supplied, and during monitoring, a sensor circuit unit is provided. Current does not flow through the device, the current consumption is further reduced. On the other hand, when the connected security sensor uses a normally-closed contact as the operating contact, an intermittent pulse signal is supplied, so that the current consumption is significantly reduced as compared with the conventional sensor that uses a constant level signal. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 4 are views for explaining a normally-closed contact type wireless transmitter for a security sensor. FIG. 1 is a block diagram showing an internal configuration of a signal processing unit which is a main part of a normally-closed contact type wireless transmitter for a security sensor. The signal processing unit A includes a pulse generation circuit unit 2, a determination unit 3, a power supply circuit 5,
An operation contact SW of a security sensor is connected to the pulse generation circuit section 2. A current detection circuit 1 composed of a resistance element having one end connected to ground is connected in series to the operation contact SW. 1 is connected to the determination unit 3. The sensor circuit section S is configured by connecting a normally closed type operation contact SW of the security sensor and the current detection circuit 1 in series, and the power supply circuit 5 includes a battery E provided outside the signal processing section A.
More drive power is supplied. The pulse generation circuit unit 2 is operated by a CPU built in the signal processing unit A,
An 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 unit S, while the discriminating unit 3 detects a change in current generated in the current detection circuit 1 and emits a signal from the security sensor. When the alarm is detected, the data necessary for the alarm notification is transmitted to the wireless transmission unit 6, the wireless transmission unit 6 is operated, and the radio signals are transmitted from the antennas 6a and 6b. It is configured to transmit in the form.

The signal processing section A having such a configuration can be constituted by a one-chip microcomputer, and FIG. 2 shows the internal configuration of the security transmitter wireless transmitter in that case. Next, referring to FIG. 2, the configuration of the wireless transmitter for security sensor of the present invention will be described.
The signal processing section A is composed of a one-chip microcomputer. The signal processing section A includes the above-described pulse generating circuit section 2 and the discriminating section 3, and the monitoring signal from the pulse generating circuit section 2 outputs Po1. The terminal and the output of the current detection circuit 1 are input to the determination unit 3 via the Po2 input terminal.
Also, a battery E is connected to the VDD terminal, and a power supply voltage is supplied from the battery E, and a drive signal is output from the signal output terminal S to the oscillation circuit 61 and the multiplier circuit 62 to the wireless transmission unit 6, Necessary alarm data is transmitted from the D terminal. Here, the alarm data is composed of, for example, 32-bit digital data.
The ID code of the wireless transmitter in the data of the bit,
An alarm signal is included. When the wireless transmission unit 6 is operated, drive signals are alternately output from the antenna terminals ANT1 and ANT2 to the polarization diversity antennas 6a and 6b, and the one-chip signal processing unit A
Has a main clock generation circuit MC for generating a high-frequency reference clock required for data transmission by the CPU. 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.
It is.

In the present invention, when monitoring the wireless transmitter, the sub-clock generation circuit SC is operated to supply a pulse signal of a predetermined period to the sensor circuit unit S. When it is determined, the main clock generation circuit MC is operated, and the CP in the signal processing unit A is activated.
U executes a control program necessary for transmitting alarm data. In such a wireless transmitter according to the present invention, when monitoring the wireless transmitter, a pulse signal of a predetermined period is output from the output terminal Po1. At this time, since the signal output terminal S does not output a drive signal, the wireless transmitter 6
Is not activated. Therefore, as shown in FIG. 4, the sensor current Is flows intermittently only when the pulse signal is supplied as shown in FIG. 4. When the information is determined, the main clock generation circuit MC is driven in addition to the output of the pulse signal of the predetermined period from the output terminal Po1, 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 in FIG. 3 are flow charts showing the alarm discriminating operation in the signal processing section of the wireless transmitter for security sensor of the present invention shown in FIG. 2, and FIG. 4) is a time chart showing the operation of each unit of the signal processing unit in accordance with a change 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 emits an alarm and the operation contact SW is opened, the pulse signal to be detected by the discriminating section 3 is interrupted, and the discriminating section 3 receives the pulse signal from the input terminal Po2. Every time the program is executed, a program for resetting a timer whose preset time is set to a predetermined time T in advance is executed. If it is determined that the pulse signal is interrupted only during the preset time T, the security sensor issues an alarm. Can be determined (step 1 in FIG. 3).
00-105).

According to the present invention, the ratio between the current t1 flowing through the sensor circuit section S and the pulse period t2 when monitoring the operation contact SW of the normally closed contact type security sensor is closed is set to 1:10. Then, 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 at the time of monitoring is remarkably reduced. Figure 5
FIG. 13 illustrates a wireless transmitter for a security sensor to which either a normally-closed or normally-open security sensor can be connected.

FIG. 5 is a block diagram showing the 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 configuration is such that a monitoring signal generation circuit section 2a is provided in place of the pulse generation circuit section 2, and the portions corresponding to FIGS. 1 and 2 are denoted by the same reference numerals and description thereof will be omitted. In the present invention, the input mode setting switch 7
Is provided, and if the type of the security sensor to be connected is selected and set, a monitoring signal having a different pattern is output from the monitoring signal generation circuit unit 2a to the sensor circuit unit S. As the pattern type of such a monitoring signal, those proposed in claims 3 and 4 are appropriately adopted.

That is, in the wireless transmitter proposed in claim 3, when the normally closed contact type security sensor is connected by the input mode setting switch 7, an intermittent pulse of a predetermined period is supplied to the sensor circuit S during monitoring. When a normally open contact type security sensor is connected by the input mode setting switch 7, a signal of a certain level is supplied to the sensor circuit section S during monitoring. On the other hand, in the case where the security sensor set by the input mode setting switch 7 is a normally closed contact type or a normally open contact type, the intermittent pulse signal of a predetermined period is supplied to the sensor circuit unit S during monitoring. The determination unit 3 that determines the presence or absence of an alarm based on a change in current of the current detection circuit 1 switches and executes a different determination program according to the type of the security sensor set by the input mode setting switch 7. The alert is determined.

In the present invention, if the security sensor to be connected has a normally-closed operating contact, setting the input mode setting switch 7 to the NC type enables the monitoring signal generating circuit section. An intermittent pulse signal is supplied to the sensor circuit unit S from the predetermined period from 2a. If 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 constant level signal is supplied from the monitoring signal generation circuit 2a to the sensor circuit S (step 2 in FIG. 7).
00-202). Then, when the input mode setting switch 7 is set to the NC type, the discriminating unit 3 performs the alarm discrimination when a predetermined number of pulse signals to be detected by the current detecting circuit 1 are lost. Step 300 in FIG.
305 and a) to d) of FIG. 11 explain the basic operation in this case, and the discriminating unit 3 sets the time equivalent to the absence of a predetermined number of pulses when setting the timer time. It is defined as a set time T. If the current detection circuit 1 detects a pulse signal within this set time,
The normally closed contact type security sensor determines that no alarm is issued, and conversely, if the current detection circuit 1 does not detect a pulse signal within this set time T, it determines that an 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 performs the alarm discrimination when the current detecting circuit 1 detects a rising signal for a predetermined time. Steps 400 to 402 in FIG. 9 and a) to FIG.
d) illustrates an example of the operation in this case. The discriminating 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) When it is detected, it is determined that an alarm is issued.

In claim 4, the invention proposed is:
Regardless of whether the security 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 unit S during monitoring. The discriminating unit 3 for discriminating the presence or absence of an alarm based on a change in the current of the circuit 1 switches and executes a different judgment program according to the type of the security sensor set by the input mode setting switch 7 to determine the alarm. ing. In such a configuration, since the sensor circuit section S is configured to supply an intermittent pulse signal regardless of the type of the sensor, the control program can be simplified.

The operation when a normally closed contact type security sensor is connected is the same as that shown in FIGS.
The operation when the normally open contact type security sensor is connected will be described. FIG. 10 is a time chart showing the discriminating operation of the discriminating unit 3, and FIGS. In FIG. 13, Io indicates a current level required for the operation of the signal processing unit B, and Ia indicates a current level consumed in the signal processing unit B for intermittently outputting a pulse signal. In such a configuration, the monitoring signal generation circuit 2
a, when a pulse signal is supplied to the sensor circuit unit S from the a, the number of pulses generated in the current detection circuit is counted,
When the count value reaches a predetermined number, the alarm of the normally open contact type security sensor is determined.

[0019]

According to the wireless transmitter for security sensor of the present invention, the following effects can be obtained. That is, in the present invention proposed in claim 1, the intermittent pulse signal is supplied to the sensor circuit unit at the time of monitoring, so that the current consumption of the battery is reduced even when the normally closed contact type security sensor is connected. Not only can the battery capacity be reduced in size, so that the battery can be reduced in size and extend the life, but also troublesome maintenance due to running out of the battery can be reduced. According to the present invention proposed in claims 2 and 3, the monitoring signal supplied to the sensor circuit unit at the time of monitoring is automatically switched and changed according to the type of the security sensor to be connected. According to the present invention, when the connected security sensor uses a normally open contact as an operating contact, current does not flow through the sensor circuit during monitoring, so current consumption is further reduced, and the connected security sensor is connected. Is a normally closed contact as an operating contact, an intermittent pulse signal is supplied to the sensor circuit, and current consumption is significantly reduced as compared with the conventional one.

[Brief description of the 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 according to the present invention.

FIG. 3 is a flowchart illustrating an alert determination operation in a determination unit.

FIG. 4 is a time chart showing the operation of the 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 according to 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 an operation of setting a monitoring signal in the wireless transmitter for a contact-type security sensor of the present invention having an input mode setting switch.

FIG. 8 is a flow chart 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 flowchart showing the alarm determination operation of the 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 flowchart showing the alarm determination operation of the 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 contact type security sensor wireless transmitter 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 a 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 security sensor.

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

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G08B 13/00-15/02 G08B 23/00-31/00

Claims (5)

(57) [Claims] 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, an alarm signal is transmitted from the wireless transmission unit in the form of a radio signal. In a wireless transmitter for a security sensor with a built-in battery, which is configured to output a signal, a sensor circuit section configured by connecting a current detection circuit in series to the normally closed operating contact of the contact type security sensor, and a monitoring signal to this sensor circuit section A pulse generating circuit for supplying an intermittent pulse signal as a predetermined period, and detecting a change in current generated in a current detection circuit in accordance with a change in the operation contact to determine an alarm of the security sensor, and And a signal processing unit including a determination unit that operates
For example, the signal processing unit, when operated wireless transmission unit
High frequency reference clock for data transmission by CPU
Main clock generation circuit that generates lock and monitoring
A low frequency reference clock for operating the pulse generation circuit
And a sub-clock generation circuit for generating a lock.
During the above monitoring , only the sub clock generation circuit is driven.
Then, the above-mentioned pulse generation circuit section is operated, and the sensor circuit is operated.
When a pulse signal of a predetermined cycle is supplied to the unit and power is supplied, while the determination unit determines that the security sensor is
Switch to driving of the main clock generation circuit and
Security sensor with a wireless transmitter
Jares transmitter. 2. A configuration in which a current detection circuit is connected in series to the operating contact of the security sensor, and when a change in current generated in the current detection circuit is detected, an alarm signal is output from the wireless transmission section in the form of a radio signal. An input mode setting switch that selects and sets the type of security sensor to be connected from the normally closed contact type or the normally open contact type in the wireless transmitter for security sensor with a built-in battery A monitoring signal generation circuit unit that outputs a monitoring signal according to the security sensor, and a change in current generated in the current detection circuit according to a change in the operating contact of the connected security sensor is detected, and the alarm from the security sensor is determined. A wireless transmitter for a security sensor, comprising: a determination unit that operates the wireless transmission unit. 3. When the input mode setting switch is a normally closed contact type security sensor, the monitor signal generating circuit outputs an intermittent pulse signal in a predetermined cycle, while the discriminating unit outputs the current detecting circuit. When a predetermined number of pulse signals to be detected by the sensor are lost, the alarm is determined, and if the input mode setting switch is a normally open contact type security sensor, the monitoring signal generation circuit section 3. The contact-type security sensor according to claim 2 , wherein a signal of a constant level is output, and said discriminating unit discriminates an alert when a signal of a predetermined level is detected by said current detection circuit for a predetermined time. Wireless transmitter. 4. When the input mode setting switch is a normally closed contact type security sensor, the monitor signal generating circuit outputs an intermittent pulse signal in a predetermined cycle, and the discriminating unit outputs the current detecting circuit. When a predetermined number of pulse signals to be detected are lost, the alarm is determined, and the monitor signal generation circuit unit is configured such that when the input mode setting switch is a normally open contact type security sensor, 3. The configuration according to claim 2 , wherein the monitor signal generation circuit outputs an intermittent pulse signal in a predetermined cycle, while the discriminator discriminates an alarm when a predetermined number of pulse signals are detected by the current detection circuit. A wireless transmitter for the contact-type security sensor according to the description. 5. A said monitor signal generating circuit, are incorporated into one-chip microcomputer in which an discriminating unit constituting the signal processing unit, according to claim which is configured to receive a power supply from the battery
The wireless transmitter for a security sensor according to 2 or 3 or 4 .