JPH07175982A - Fire sensor - Google Patents

Abstract

PURPOSE:To attain the processing with low power consumption even with the use of a high speed MPU. CONSTITUTION:A signal processing MPU 9b operated at a comparatively high speed has the active mode and the stop mode and receives a voltage proportional to a resistance of a thermister TH in the active mode and processes the voltage signal and outputs processing data to a receiver and a repeater. A transmission processing MPU 9a counts polling pulses on sensor lines S,SC to monitor a call to its own address and sets the MPU 9b to the active mode only while a call is received.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector for detecting fire data such as temperature and smoke density by an MPU (microprocessor), and more particularly to detecting a call from a receiver or a repeater and returning the detected data. Fire detector.

[0002]

2. Description of the Related Art Conventionally, in this type of fire detector, power is supplied from a receiver or a repeater, and one MPU detects the temperature and the smoke concentration in response to a call from the receiver or the repeater. It is configured to send back the detection data together with.

[0003]

However, in the conventional fire detector, since all the processing in the detector is performed by one MPU, if a high-speed MPU is used to increase the processing speed, high-speed Since the MPU consumes a lot of power, power is wasted in the normal monitoring state,
Further, the battery for driving the receiver, the terminal device, the bell and the like does not become small at the time of power failure, so that there is a problem that the receiver cannot be made compact. This problem is 1
It becomes remarkable as the number of sensors connected to one sensor line increases.

In view of such conventional problems, an object of the present invention is to provide a fire detector capable of increasing the processing speed with low power consumption.

[0005]

In order to achieve this object, the present invention provides an operation mode for capturing and processing fire data such as temperature and smoke density at a relatively high processing speed, and an operation stop for stopping the processing. A first MPU having a mode and a second MPU that sets the first MPU to the operation mode or the operation stop mode at a relatively low processing speed are provided.

The present invention also sets the first MPU in the operation mode only while the second MPU is calling from the receiver or the repeater, and the first MPU captures fire data in the operation mode and processes the fire data. However, the processed data is returned to the receiver or the repeater.

[0007]

In the present invention, the processing speed can be increased by the relatively high speed first MPU, and the operation stop mode is set when the relatively high speed first MPU does not need to operate. It is possible to realize low power consumption. Also, the second MPU, which has a relatively slow processing speed, sets the first MPU in the operation mode only while the receiver or the repeater is calling and captures and processes the fire data, and processes the processed data to the receiver or the receiver. Since a reply is sent to the repeater, when multiple sensors are connected to one sensor line and communication is performed with the receiver or repeater in a polling manner
Only the first MPU of the two sensors is set to the operation mode, and thus low power consumption can be realized.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an analog type heat detector as an embodiment of the fire detector according to the present invention. In FIG. 1, a rectifier circuit 1 is connected to a repeater or receiver (not shown) via a sensor line composed of a signal line S and a common line SC, and a DC power supply voltage is supplied from the repeater or receiver. At the same time, a calling signal as described later is applied. One or more sensors are connected to the sensor lines S and SC.

The DC voltage supplied via the sensor lines S and SC is depolarized by the rectifier circuit 1 and then the noise is absorbed by the noise absorption circuit 2. Next, the constant voltage circuit 4a generates a constant voltage of + 10V for an analog circuit, and the constant voltage circuit 4b generates a constant voltage of + 5V for a control circuit such as an MPU. Further, a response signal to the calling signal from the repeater or the receiver is generated by the response signal circuit 3 as a current, and is returned via the noise absorption circuit 2 and the rectification circuit 1.

The voltage detection circuit 5 turns on the current switches 6a and 6b when the output voltage of the constant voltage circuit 4a exceeds a predetermined value when the sensor rises. Constant voltage circuit 4a
Is supplied to the constant current circuit 7 and the series circuit of the thermistor TH having a negative characteristic and the A / D reference voltage circuit 8 via the current switch 6a, and the output voltage of the constant voltage circuit 4b is supplied to the current switch 6b. Transmission processing MPU (1) 9
a and MPU for signal processing that performs temperature detection, signal output, etc.
(2) It is supplied to 9b. Here, as an example, the MPU 9a for transmission processing has a master clock of 400 KHz, and the MPU 9b for signal processing has 2 MHz.

A voltage VTH corresponding to the resistance value of the thermistor TH
Is taken in by the signal processing MPU 9b, and the reference value RE for the A / D conversion scale by the A / D reference voltage circuit 8 is obtained.
A / D conversion is performed based on F. Further, the constant current circuit 7 applies variable constant currents I _open , I _LOW , and I _High (I _open <I _LOW <I _High ) to the thermistor TH by the control of the signal processing MPU 9b, and the MPU 9b has a three-step current range. Is configured to detect temperature.

The ringing signal transmitted from the repeater or receiver is detected by the ringing detecting circuit 10 via the sensor lines S, SC, the rectifying circuit 1 and the noise absorbing circuit 2, and the detected signal is the MPU 9a for transmission processing. Applied to. The address setting circuit 11 is composed of, for example, a DIP switch or the like, and the address of this sensor is set in advance.
When the power is turned on from the constant voltage circuit 4b, the PU 9a is initialized and then reads this address. Similarly, the model setting circuit 13 is also configured by a DIP switch or the like, and a type code indicating a heat detector or a smoke detector is preset, and the signal processing MPU 9b is initialized when the power is turned on from the constant voltage circuit 4b. After that, this type code is read and then the mode is changed to the stop mode.

1 from the repeater or receiver to this sensor
The calling signal of the frame is, for example, as shown in FIG. 3, a reset pulse RST sent at the beginning and the sensor lines S and SC.
It is composed of a plurality of polling pulses P sequentially sent at a predetermined interval according to the number of the above sensors, and a response signal is returned from each sensor during each polling pulse P. The width of the reset pulse RST is set to be longer than that of the polling pulse P, and the sensor line S,
The address counters in the MPU 9a for transmission processing of all the sensors on the SC are reset.

Then, the address counter counts the polling pulse P following the reset pulse RST, and when the count number and the address set via the address setting circuit 11 match, the transmission processing MPU 9a calls itself. Identify and / ST as detailed in Figure 2
The signal processing MPU 9b is activated via the OPC generation circuit 12 (“/” is used for an inverted signal).

Here, the signal processing MPU 9b receives the input port / S when the input signal of the input port D0 is at the low level.
When the input signal of TOPC becomes low level, it transits from the stop mode to the active mode, and the input port D
When the input signal of 0 goes high, the active mode is switched to the stop mode. Explaining in detail with reference to FIGS. 2 and 3, first, when the transmission processing MPU 9a identifies a call addressed to itself, it becomes an active signal which becomes a low level until polling detection of the next address (D2 output in the figure, the same applies hereinafter. ) From the output port D2 / STOPC generation circuit 12 and MPU for signal processing
9b input port D0, then ports D4, D
The outputs of 3 and D6 are generated in this order and applied to the input ports D1, D2, and D3 of the signal processing MPU 9b, respectively.

In the / STOPC generation circuit 12, as shown in FIG. 2, when the D2 output of the transmission processing MPU 9a becomes low level, the base-ground voltage Vc of the transistor Q14-1 and the voltage Vr across the resistor R47 become Vc <. It becomes Vr, the transistor Q11 is turned off, and the output signal / STO
PC goes low. At the same time, the charging circuit of the resistor R45, the diode D6-2 and the capacitor C21 starts to operate, the charging voltage of the capacitor C21 rises, and Vc>
When it becomes Vr, the transistor Q11 is turned on and the output signal / STOPC becomes high level. Therefore, at the rising edge of this output signal / STOPC, the signal processing MPU
9b shifts from the stop mode to the active mode.

Here, when the processing for polling of this sensor is completed, the D2 output of the transmission processing MPU 9a becomes high level. However, if the diode D6-2 is not provided, the residual voltage of the capacitor C21 causes the transistor Q to be turned on.
The base voltage of 14-1 becomes higher than the collector voltage, and as a result, the base current of the transistor Q11 stops flowing, the transistor Q11 is turned off again, and the output signal / S
TOPC goes low. Therefore, the diode D6
-2 is provided so that the output signal / STOPC does not go to the low level even if the D2 output of the transmission processing MPU 9a goes to the high level.

The operation of the transmission processing MPU 9a will be described with reference to the flowchart shown in FIG. First, as described above, when the power is turned on from the constant voltage circuit 4b, the address is read after being initialized, and the standby state is set. Then, when the reset pulse RST is received, the address counter is reset, and the polling pulse P is counted to monitor its own address (step S1). When the self address is identified, the D2 output is set to the low level to output the / STOPC generation circuit 1
2 is operated to shift the signal processing MPU 9b from the stop mode to the active mode (step S2).

Then, when a fire is detected, a timing signal for outputting a fire bit from the signal processing MPU 9b is output from the output port D4 (step S3),
Next, a timing signal for outputting the temperature data from the signal processing MPU 9b is output from the output port D3 (step S4), and then the type data is output to the signal processing M.
A timing signal for output from the PU 9b is output from the output port D6 (step S5).

Then, it is monitored whether or not the polling pulse of the next address is detected (step S6), and YES.
In this case, the D2 output is shifted to the high level to shift the signal processing MPU 9b from the active mode to the stop mode (step S7). Next, the operation of the signal processing MPU 9b in the active mode will be described with reference to the flowchart shown in FIG. First, as described above, when power is turned on from the constant voltage circuit 4b, the active mode is set, the initialized post-type data is read, and then the stop mode is entered. After that, when the mode is shifted to the active mode under the control of the transmission processing MPU 9a, the disconnection detection mode processing is executed first (step S11). In this disconnection detection mode, the current of the constant current circuit 7 is set to the disconnection detection current Iopen, the voltage VTH corresponding to the resistance value of the thermistor TH is taken in, and it is determined whether or not the voltage is equal to or higher than a predetermined voltage (step S12). In the case of, the thermistor TH judges that the wire is broken (step S13),
It proceeds to step S19.

On the other hand, if the thermistor TH is not disconnected, the range determination mode is entered (step S14), and the current of the constant current circuit 7 is set to the low range ILOW (step S15). Next, the voltage VTH corresponding to the resistance value of the thermistor TH is taken in to determine whether or not the voltage corresponds to 40 ° or more (step S16). If YES, the current of the constant current circuit 7 is set to the high range IHigh. Step S
From S17, the process proceeds to step S18. If NO, the current of the constant current circuit 7 is left as it is and the process proceeds to step S18.

Next, the voltage VTH corresponding to the resistance value of the thermistor TH is taken in, and when it is judged that there is a fire, a fire bit is output at the timing of the D4 output of the transmission processing MPU 9a, and then the D3 output of the transmission processing MPU 9a. Outputs temperature data at the timing, then MPU9 for transmission processing
The type data is output at the timing of D6 output of a (step S19).

Here, in the present embodiment, when it is determined that there is a disconnection, the disconnection information is returned to the repeater or the like by not outputting the type data. Next, the signal of the input port D0 is monitored (step S20), and when it goes to the high level, the stop mode is entered. Therefore, even if a high-speed signal processing MPU 9b is used,
Since it operates only when it receives a call by polling, it is possible to increase the processing speed with low power consumption for the entire sensor.

In the above embodiment, the MPU for signal processing is used.
Although 9b is configured to shift to the stop mode when the signal at the input port D0 becomes high level, it may be configured to automatically shift to the stop mode by a program after outputting the type data. In the above embodiment, the analog type heat detector using the thermistor TH has been described as an example. However, as in the photoelectric type or ionization type smoke detector, MP
It can also be applied to other fire detectors using U.

[0025]

As described above, according to the present invention, the first MPU having the operation mode in which the fire data such as the temperature and the smoke density is captured and processed at a relatively high processing speed, and the operation stop mode in which the processing is stopped. And a second MPU for setting the first MPU to the operation mode or the operation stop mode at a relatively low processing speed, the first MPU having a relatively high speed is provided.
The PU can increase the processing speed, and since the operation stop mode is set when the relatively high-speed first MPU does not need to operate, low power consumption can be realized.

The present invention also sets the first MPU in the operation mode only while the second MPU is calling from the receiver or the repeater, and the first MPU captures fire data in the operation mode and processes the fire data. However, since the processed data is returned to the receiver or repeater, if multiple sensors are connected to one sensor line and communication is performed with the receiver or repeater by polling, Only the first MPU of one of the sensors is set to the operation mode, and thus low power consumption can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a heat detector as an embodiment of a fire detector according to the present invention.

FIG. 2 is a / STOPC generation circuit of FIG. 1 and an M for transmission processing.
Circuit diagram showing in detail control signals between PU and signal processing MPU

FIG. 3 is a timing chart showing control signals between the transmission processing MPU and the signal processing MPU of FIG.

FIG. 4 is a flowchart for explaining the operation of the transmission processing MPU of FIG.

5 is a flowchart for explaining the operation of the signal processing MPU of FIG.

[Explanation of symbols]

 1: Rectifier circuit 2: Noise absorption circuit 3: Response signal circuit 4a, 4b: Constant voltage circuit 5: Voltage detection circuit 6a, 6b: Current switch 7: Constant current circuit 8: A / D reference voltage circuit 9a, 9b: MPU (Microprocessor) 10: Call detection circuit 11: Address setting circuit 12: / STOPC generation circuit 13: Model setting circuit TH: Thermistor D6-1, D6-2: Diode Q14-1, Q14-2, Q11: Transistor R45, R46, R47, R65, R66: Resistance

Claims (2)

[Claims] 1. A relatively high processing speed first MPU having an operation mode for capturing and processing fire data such as temperature and smoke concentration, and an operation stop mode for stopping the processing, and the first MPU A fire detector comprising: a second MPU having a relatively slow processing speed, which is set to an operation mode when it needs to operate, and set to an operation stop mode when it does not need to operate. 2. The fire detector according to claim 1, wherein the second MPU sets the first MPU in an operation mode only during a call from a receiver or a repeater, and the first MPU
The PU captures and processes fire data during the operating mode,
A fire detector characterized by returning processed data to a receiver or repeater.