JP2584678Y2 - Door lock detection circuit - Google Patents

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door lock detection circuit for detecting a signal from a door lock sensor in a door lock alarm device.

2. Description of the Related Art Conventionally, in a security device for dwelling units for managing security information of dwelling units, a door-locking alarm device which detects an open / closed state of a door or a window and generates an alarm has been used. In the door lock alarm device, various door lock detection circuits are used to detect the open / close state of the door lock sensor. FIG. 2 shows a block diagram of a security device for dwelling units using a conventional door lock detection circuit. In the figure, the signal from the fire sensor 201 is the fire detection circuit 2
05, and is output to the port P1 of the central processing unit (CPU) 208 as a fire detection signal. A signal from the gas sensor 202 is detected by a gas detection circuit 206, and is used as a gas detection signal in the port P2 of the CPU 208.
Is output to On the other hand, signals from the off-type door-locking sensor 203 that is closed when set and open when activated and the signal from the on-type door-locking sensor 204 that is open when set and closed when activated are detected by a door-locking detection circuit 207, and a door-locking detection signal. Is output to the port P3 of the CPU 208. The CPU 208 includes the detection circuits 205, 206, 2
In response to the detection signal from the counter 07, different signals are output from the port P4 to the alarm sound generation circuit 209, and the corresponding indicators of the alarm indicator lamp circuit 212 having a plurality of indicators from the ports P5 to P7 are turned on. Drive. The alarm sound generation circuit 209 outputs an alarm sound corresponding to the signal from the CPU 208 to the amplifier circuit 210. The amplification circuit 210 amplifies the input signal and drives the speaker 211. Accordingly, an alarm sound corresponding to the sensors 201 to 204 that have detected the abnormal state of the door closing is emitted from the speaker 211, and the corresponding indicator light is turned on. Next, the operation of the door closing detection circuit 207 will be described. When the door-locking alarm state setting switch 324 is switched from the setting release terminal 3 side to the setting terminal 2 side and set to the alarm state, current flows from the power supply VCC through the path of the resistor 312, the LED 322, and the ground potential, and the LED 322 is turned on. I do. Thus, it is notified that the alert state has been set. Also capacitor 3
A current for charging the capacitor 323 flows through the path of the resistor 23, the resistor 310, the base and the emitter of the transistor 321, and the transistor 321 is biased. When the transistor 321 is biased, a current flows through the path of the power supply VCC, the transistor 319, the resistor 309, and the transistor 321 and a voltage is applied to the nodes of the resistors 303 and 307. The bias current of the transistor 321 stops flowing when the charging of the capacitor 323 is completed, and the transistor 321 is turned off. Therefore, no voltage is applied to the nodes of the resistors 303 and 307.
When the ON-type door-locking sensor 204 is closed in a state where the charging current to the capacitor 323 stops flowing, the current is changed to the power supply VCC, the transistor 318, and the resistor 30.
3, flows through the resistor 307, the resistor 304, the terminal M, the ON-type door-locking sensor 204, and the ground. As a result, the transistor 318 is biased, and the power supply VCC, the transistor 3
18, a door closing detection signal is transmitted to the port P3 of the CPU 208 via the resistor 314. Further, a current flows through a path of the power supply VCC, the transistor 318, the diode 317, the resistor 305, the transistor 320, and the ground. As a result, an operation holding circuit formed by the transistors 318 and 320 is formed, and the door-locking detection signal is continuously transmitted to the CPU 208 even when the ON-type door-locking sensor 204 is opened. To release the holding state, the switch 324 is turned to the terminal 3 side, and power supply to the circuit such as the transistor 318 is cut off, so that the transistors 318 and 320 are released. When the switch 324 is connected to the terminal 2 side and the charging current to the capacitor 323 stops flowing and the off-type door-locking sensor 203 is activated and becomes open, the current is reduced to the power supply VCC, the resistor 301, and the diode 31.
6, flows through the path of the resistor 305, the resistor 306, and the ground. This biases transistor 320, thus
Transistor 318 is also biased. As a result, as in the case of the operation of the ON-type door-locking sensor 204, a holding circuit formed by the transistors 318 and 320 is formed.
The door closing detection signal is continuously transmitted to the port P3 of the PU 208. When the door closing detection signal is transmitted to the port P3 of the CPU 208, the CPU 208 generates an alarm sound indicating that the door closing detection signal has been input to the port P3.
The alarm sound generation circuit 209 is controlled. The amplification circuit 210
The alarm sound from the alarm sound generation circuit 209 is amplified, and the alarm sound is sounded from the speaker 211. Further, the CPU 208 controls the alarm indicator light circuit 212 to blink the door-locking alarm indicator. Alarm sound generation circuit 209 and alarm indicator circuit 21
2 operates while the alarm signal continues to be input to the port P3 of the CPU 208. Switch 324 to terminal 3
By switching to the side, the holding operation of the door closing detection circuit 207 is released, and the blinking of the alarm sound / indicating light stops.

In the door lock detection circuit 207 described above, the open / close state of the off type door lock sensor 203 and the ON type door lock sensor 204 is checked by the switch 3.
24 is connected to the terminal 2 side, and there is a problem that it can be performed only when the door closing detection circuit 207 is set to the operating state. Further, even when the switch 324 is set to the terminal 2 side and the state of the off-type door-locking sensor 203 and the state of the on-type door-locking sensor 204 are to be checked, there is a problem that the state cannot be checked unless a delay time for preventing false alarm has elapsed. Was. Furthermore, if the user tries to go out after checking the states of the off-type door-tightening sensor 203 and the on-type door-tightening sensor 204, an alarm sounds when the door is opened or closed since the delay time has already passed. The present invention has been made to solve the above-described problem, and has as its object to provide a door-locking detection circuit that can constantly check the state of a door-locking sensor regardless of whether a door-locking alarm is set.

The door lock detection circuit of the present invention interrupts a signal from an ON-type door lock sensor or an OFF-type door lock sensor for a predetermined period of time at the time of alarm setting, and shuts off the output of the detection signal. Detects the signal from the sensor, keeps the detection state, outputs the detection signal, emits an alarm sound, and switches the first control signal to the setting release side terminal or the alarm setting side terminal in the door closing detection circuit that turns on the indicator light A first switch circuit that supplies a signal, a second switch circuit that closes and outputs a detection signal in response to a closing signal from an ON-type door-locking sensor or an open signal from an OFF-type door-locking sensor, and a setting release terminal. A third switch circuit that is connected to output a second control signal for closing and closing the detection signal in response to the first control signal; A display circuit that is connected and driven based on the detection signal when the second and third switch circuits are in the closed state; and a display circuit that opens in response to the second control signal and shuts off the detection signal from the second switch circuit. And a four-switch circuit.

When the first switch circuit is connected to the setting release side, the third switch circuit is directly controlled by the first control signal, and the second switch circuit outputs a detection signal indicating the open / close state of each sensor. Output to drive the display circuit. At this time, no detection signal is output from the fourth switch circuit. When the first switch circuit is connected to the alert setting side, a detection signal is output from the second switch circuit within a predetermined time, thereby driving the display circuit. No detection signal is output. After a lapse of a predetermined time, the signal is output from the fourth switch circuit.

FIG. 1 is a block diagram showing an embodiment of the present invention. The same parts as those in FIG. 2 are denoted by the same reference numerals. In FIG. 1, the door lock detection circuit 100 includes a terminal B,
Off-type door-locking sensor 203 at M and ground terminal C
And an on-type door locking sensor 204. The terminal M is connected to the base of the PNP transistor 129 as the second switch circuit, the resistor 103 and the resistor 104 via the resistor 101. The resistor 103 is connected to the power supply VCC. The resistor 104 is an NPN transistor 1
It is grounded via 30 collectors and emitters. The emitter of the transistor 129 is connected to the power supply VCC,
The collector is connected to the resistors 105 and 116 and the emitter of the PNP transistor 134. The resistance 105 is L as a display circuit for displaying the state of the door lock sensor.
It is connected to the anode of the diode 124 via the ED 136. The cathode of the diode 124 is connected to the resistor 106.
Is connected to the base of the transistor 130 as a holding circuit and the resistor 107 through the gate. Transistor 13
The emitter of 0 is grounded and the collector is connected to resistor 104. The other end of the resistor 107 is grounded. LE
The cathode of D136 is connected to the collector of the NPN transistor 131 as a third switch circuit and the cathode of the diode 126 via the anode and cathode of the diode 125. The emitter of the transistor 131 is grounded, and a parallel circuit of a resistor 110 and a capacitor 127 that holds the state of the transistor 131 when the switch 138 is switched is provided between the base and the ground. On the other hand, the terminal B is connected to the power supply Vcc via the resistor 102 and to the cathode of the diode 124 and the resistor 106 via the anode and cathode of the diode 123. The common terminal 1 of the door-locking alarm setting switch 138 as the first switch circuit is connected to the power supply VCC for generating the first control signal, and the setting release side terminal 3 is connected to the resistor 10.
8 and 109 are connected to the base of the transistor 131. The alert setting side terminal 2 is grounded via the resistor 111 and the anode and cathode of the door lock alert status display LED 137. The emitter of the PNP transistor 132 is connected to the power supply VCC, and the collector is connected to the junction of the resistor 108 and the resistor 109 via the capacitor 128 for keeping the operation of the transistor 131 immediately after the door closing alarm is set. The base of the transistor 132 is connected to the power supply VCC via the resistor 114 and the resistor 11
5 is connected to the collector of the NPN transistor 133. The emitter of the transistor 133 is grounded, the base is connected to the terminal 2 of the switch 138 via the resistor 112, and is grounded via the resistor 113. Transistors 132 and 133, resistors 109 and 11
2, 113, 114 and 115 and the capacitor 128 constitute a timed circuit. The base of the transistor 134 is connected to the collector of the NPN transistor 135 via the resistor 117. The base of the transistor 135 is connected to the power supply VCC through the resistors 121 and 120 and is grounded through the resistor 122. Resistors 120 and 1
The connection point 21 is connected to the anode of the diode 126. Transistors 134 and 135, diode 12
6, the resistors 116, 117, 120, 121, 122
This constitutes a fourth switch circuit. Transistor 134
Are grounded via resistors 118 and 119. From the connection point of the resistor 118 and the resistor 119, a door closing detection signal is output to the CPU 208. The operation of the door closing detection circuit 100 configured as described above will be described below.
Note that, as an initial state, the off-type door-locking sensor 203 and the on-type door-locking sensor 204 are in the state shown in the figure, and the switch 138 is also in the state connected to the terminal 3 as shown in the figure. In this state, switch 1
A current flows through the path of the resistor 38, the resistor 108, the resistor 109, the resistor 110, and the ground, and biases the transistor 131.
As a result, the collector voltage of the transistor 131 decreases, and the diode 125
A path for the transistor 131 and the ground is formed. In this state, when the ON-type door-locking sensor 204 is activated or closed, a current flows through the power supply VCC, the resistors 103 and 101, the terminal M, the ON-type door-locking sensor 204, and the ground to bias the transistor 129. This allows the power supply VCC,
A current also flows through the path of the transistor 129, the resistor 105, the LED 136, the diode 125, the transistor 131, and the ground, and the LED 136 is turned on.
04 operating state can be understood. If the ON type door lock sensor 204 is in the open state, the transistor 129 is not biased,
The LED 136 is turned off. On the other hand, when the off-type door-locking sensor 203 is in an operating state, that is, an open state, a current flows through a path of the power supply VCC, the resistor 102, the diode 123, the resistor 106, the resistor 107, and the ground, and the transistor 13
0 is biased. When the transistor 130 is biased, a current flows through the path of the power supply VCC, the resistors 103 and 104, the transistor 130, and the ground,
Is biased. As a result, the power supply VCC, the transistor 129, the resistor 105, the LED 136, the diode 12
5, a current also flows through the transistor 131 and the path of the ground L
The ED 136 lights up, and the operating state of the off-type door-locking sensor 203 is known. In this state, no alarm signal is output because the collector voltage of the transistor 129 is in a state where the transistor 134 is not biased. Here, the fact that the transistor 134 is not biased will be described. When the switch 138 is connected to the terminal 3 side, the transistor 131 is biased, so that the collector potential of the transistor 131 is the ground potential, and the transistor 131 generates a low level signal as the second control signal. . Therefore, the bias to the transistor 135 via the diode 126 is cut off, and as a result, the transistor 134 is also in an unbiased state. Switch 138
Is switched to the terminal 2 side, the power supply VCC, the resistor 11
1, the current flows through the LED 137 and the ground path, and the LED 1
37 lights up. Also, a current flows through the path of the power supply VCC, the resistor 112, the transistor 133, and the ground. As a result, the power supply VCC, the transistor 132, the resistor 11
5, a current flows also in the path of the transistor 133 and the ground. Since the transistor 132 is biased, the power supply VCC, the transistor 132, the capacitor 12
8, a current flows through the path of the resistor 109 and the transistor 131 to bias the transistor 131. This state is maintained only during the time when the charging current is flowing through the capacitor 128. This time is the dead time after the alert setting, that is, during this time, the transistor 131 is the same as when the switch 138 is connected to the terminal 3 side. When the charging current to the capacitor 128 stops flowing, the transistor 131 is no longer biased. At this time, when the ON-type door-locking sensor 204 is activated, that is, closed, the transistor 129 is biased. At this time, since the transistor 135 is biased by the power supply VCC, the resistor 120, the resistor 121, the transistor 135, and the ground, the transistor 134 is also biased. Thus, the collector voltage of the transistor 129 becomes the transistor 13
4. CPU 208 as a warning signal via resistor 118
Is transmitted to Further, the resistor 105, the LED 136, the diode 12
4, a current flows through the path of the resistor 106, the transistor 130, and the ground, and the transistor 130 is biased. Accordingly, the transistor 129 is also biased via the resistor 104, and a holding circuit including the transistor 129, the resistor 105, the diode 124, the resistor 106, the transistor 130, the resistor 104, and the transistor 129 is formed. Thus, the operation is maintained even if the ON-type door closing sensor 204 is returned to the open state. Off type door lock sensor 2
When 03 is operated, a holding circuit is formed in the same manner as above, and the same operation is performed. When the switch 138 is switched to the terminal 3 side, the transistor 131 is biased and the LED 1
36 and the current at the node between the diode 124 and the transistor 1
31, the bias of the transistor 130 is cut off, and the holding is released. As a result, no alarm signal is output. In the above embodiment, the transistor 132 and the capacitor 128 serve as a timed circuit for setting the dead time.
And a time constant circuit composed of a resistor 109 and the like.
A timer circuit using a digital circuit may be used, and a control signal may be supplied from the timer circuit to the base of the transistor 131 only for a predetermined time. According to the present embodiment, the state of the door-locking sensor can be known regardless of the presence or absence of the door-locking warning setting. Therefore, the state of the door-locking sensor can be grasped before setting. Further, since the detection circuit 100 does not perform a warning operation within a predetermined time (dead time) after the setting, an effect is obtained that a changeover switch or the like for setting or canceling the warning operation need not be provided outside the dwelling unit. .

According to the door-locking detection circuit of the present invention, the state of the door-locking sensor can be known even when the door-locking alarm setting is not set, so that the state of the door-locking sensor can be grasped before the alarm-locking setting.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a door closing detection circuit according to the present invention.

FIG. 2 shows a security device for a dwelling unit including a conventional door lock detection circuit.

[Explanation of symbols]

2 ・ ・ ・ Alarm setting side terminal 3 ・ ・ ・ Setting release side terminal 100 ・ ・ ・ door closing detection circuit 138 ・ ・ ・ Switch which constitutes the first switch circuit 129 ・ ・ ・ Transistor which constitutes the second switch circuit 131 ・ ・ ・· Transistors 134 and 135 constituting the third switch circuit · · · · Tarangista constituting the fourth switch circuit 136 · · · display circuit 203 · · · · off-type door-locking sensor 204 · · · · · ON-type door-locking sensor

Claims (1)

(57) [Scope of request for utility model registration] When an alert is set, an ON type door lock sensor (20) is set.
4) Alternatively, the output of the detection signal is interrupted by delaying the signal from the off-type door closing sensor (203) for a predetermined time, and after the predetermined time has passed, the signal from the sensor is detected, the detection state is maintained, and the detection signal is output. In the door-locking detection circuit that emits an alarm sound and turns on the indicator lamp, the first switch circuit (13) that switches and supplies the first control signal to the setting release terminal (3) or the alarm setting terminal (2).
8) and a second switch circuit (12) that closes and outputs a detection signal in response to a close signal from the ON-type door-locking sensor or an open signal from the OFF-type door-locking sensor.
9) a third switch circuit (131) that is connected to the setting release side terminal, outputs a second control signal for closing the detection signal and shutting off the detection signal in response to the first control signal; A display circuit (136) connected in series to the second and third switch circuits and driven based on the detection signal when the second and third switch circuits are in a closed state, and responsive to the second control signal. And a fourth switch circuit (134, 135) for shutting off the detection signal from the second switch circuit.