TWI427564B - Fire alarm - Google Patents

Description

Alarm Field of invention

The present invention relates to an alarm device that is installed in a house and can be used to detect a fire smoke by a battery drive.

The application is based on Japanese Patent Application No. 2007-188055, the contents of which are incorporated herein by reference.

Background of the invention

Residential fire alarms are well-known conventional alarms (photoelectric smoke sensors) that detect fires when the indoor smoke concentration exceeds a predetermined value and cause the alarm display to flash, while notifying the nearby fires by sounding an alarm Alarm function.

The above-mentioned residential alarms operate with a lithium battery as a power source, and ensure that once the battery is installed, the battery can be monitored without changing the battery for seven years.

The above-mentioned alarm device has a battery voltage of, for example, 3 volts, which is lower in the voltage of the illuminating driving LED, so that the boosting circuit boosts the battery voltage to, for example, 6 volts to make the LED emit light. Thereby, even if the microsecond light is emitted for a short period of time, the LED can emit a sufficient amount of light to obtain the scattered light which has flowed into the smoke detecting chamber.

Fig. 5 is a functional area diagram showing the light-emitting drive circuit and the MPU of the conventional alarm device. The light-emitting drive circuit 100 shown in the figure is provided with a constant voltage circuit 104 in addition to the battery 102, and charges a capacitor having a larger capacity to a certain voltage. The capacitor 106 is connected in series with a capacitor 110 and a resistor 111 having a large capacity via a switching element 108 such as a transistor or an FET, and further connected to a resistor 112 in a parallel relationship with the tandem circuit including the switching element 108 and the capacitor 110. . With the above connection structure, a charge pump circuit is constructed. The secondary side of the capacitor 110 is connected to the LED 116 of the light-emitting element via the switching element 114.

The battery 102 can charge the capacitor 110 to a constant voltage via the resistor 11 with the switching elements 108, 114 turned off. Secondly, if a fire detection cycle such as once every 10 seconds has elapsed, the switching element 108 is activated by the MPU 118, and the capacitor 106 is connected in series to the capacitor 110 to boost the voltage by a factor of two. At the same time, the MPU 118 will activate the switching element 114 and apply a voltage boosted by the series connection of the capacitors 106, 110 to the LED 116 to cause it to illuminate.

Light from LED 116 will scatter by colliding with smoke particles that have flowed into the smoke detection space. The scattered light is received by the photodiode 120 of the light receiving element and converted into a weak received light signal, and amplified by the optical amplifying circuit 122 in synchronization with the light emitting driving, and then input to the MPU 118, and then converted into light receiving data by AD conversion. . When the light receiving data exceeds a predetermined degree of fire, the alarm output circuit 124 is operated to generate a fire alarm.

Figure 6 is a diagram showing the functional area of the illumination driving circuit and the MPU of the other alarms. The light-emitting drive circuit 100 is not provided with a constant voltage circuit, and the battery 102 is charged with a certain voltage by the battery 102. The capacitor 126 is connected in series with the capacitor 130 having a small capacity via the switching element 128, and further connected to the reverse current preventing diode 132 in parallel with the tandem circuit of the switching element 128 and the capacitor 130. Further, a switching element 134 is connected in series with the capacitor 130.

On the secondary side of the capacitor 130, a capacitor 138 having a large capacity is connected via the reverse current preventing diode 136, and the LED 116 of the light-emitting element is connected via the switching element 140 and the constant voltage circuit 142.

The battery 102 can charge the capacitor 130 having a small capacity via the reverse current preventing diode 132 in a state where the switching element 128 is turned off and the switching element 134 is activated. Then, the MPU 118 switches the switching element 128 to start, and switches the switching element 134 to off, and then connects the capacitor 130 to the capacitor 126 in series, and repeats the countercurrent prevention diode 136 by the boosted voltage. The charging operation of the capacitor 138 having a larger capacity. Next, if the fire detection period has been once every 10 seconds, the switching element 140 is activated, and the boosted voltage is applied to the LED 116 to cause it to emit light.

As described above, by repeating the charging by the capacitor 130 having a small capacity, the amount of movement of each charge can be suppressed, and the capacity of the switching elements 128, 134 can be reduced. Further, the constant voltage circuit 142 is operated only during the light-emitting operation.

[Patent Document 1] JP-A-2007-011828

[Patent Document 2] JP-A-2006-350412

[Patent Document 3] JP-A-2007-179367

[Patent Document 4] Shikaiping 05-008696

However, the above-described conventional light-emitting drive circuit for a residential alarm has the following problems.

First, the light-emitting drive circuit 100 shown in FIG. 5 is required to provide the constant voltage circuit 104, and the current consumption of the constant voltage circuit 104 also has a problem of shortening the battery life. Further, in order to perform the boosting operation, two switching elements such as a transistor capable of circulating a large current are required, and there is also a problem that the cost is increased.

Further, in the light-emitting drive circuit 100 shown in Fig. 6, the constant voltage circuit 142 does not have a constant current consumption, and the capacitor 130 used for boosting has a small capacity. Therefore, the switching elements 128 and 134 used for boosting can be small. The transistor. However, since the boosting operation is performed by the reverse operation of the switching elements 128 and 134, the excess base current will flow through the transistor, and the operating current of the MPU 118 will also flow during the boosting operation, so that the life of the battery 102 is shortened. problem. Further, the reverse flow prevention of the capacitor 130 prevents the diode 136 from being provided, so that the number of parts is increased and the cost is increased.

The present invention has been devised in view of the above problems, and an object of the present invention is to provide an alarm device which can reduce the current consumption and extend the life of the battery while reducing the number of components and cost, even if it is necessary to increase the light emission.

The present invention has attained the above object in order to solve the above problems, and employs the following method.

That is, (1) the alarm device of the present invention includes: a light-emitting portion; a battery power source; and a booster circuit that can boost a voltage of the battery power source to generate a boosted voltage; and the light-emission control unit can control the booster circuit. When the boosted voltage is obtained, the boosted voltage is supplied to the light-emitting portion so as to be intermittently driven to emit light; and the light-receiving portion can receive scattered light that is scattered by the light from the light-emitting portion due to smoke; and the conversion circuit can The light receiving signal from the light receiving unit is converted into light receiving data; the fire detecting unit detects the fire based on the light receiving data from the converting circuit; and the alarm unit can issue an alarm based on the fire detecting signal from the fire detecting unit; a voltage circuit capable of generating a reference voltage relative to the booster circuit and the conversion circuit; and a clock circuit for outputting a clock signal for operating the booster circuit, the light-emitting control unit, and the conversion circuit; a processing circuit for realizing the functions of the light emission control unit and the fire detection unit, and the boosting power , The conversion circuit, the reference voltage circuit, the clock circuit, each control circuit portion of the circuit line disposed on the integrated circuit has been packaged.

(2) The control circuit corresponding to the clock circuit of the present invention may further include: a clock generation circuit that outputs a low-speed clock signal and a high-speed clock signal; and a switching mechanism that selects the low-speed clock signal or the high-speed clock signal; and The control unit may select and output the high-speed clock signal to the switching mechanism when the test mode is set, and select a low-speed clock for the switching mechanism when the non-test mode is set.

(3) The control circuit corresponding to the clock circuit of the present invention may further include: a first switching unit that turns on or off the clock signal supplied from the clock circuit to the processing circuit; and the second switching unit may The clock signal supplied to the boosting circuit by the clock circuit is turned on or off; the boost setting timer can set the operating time of the boosting circuit; and the sleep setting timer can set the sleep time of the processing circuit; The control unit activates the second switching unit while the first switching unit is turned off, and stops the supply of the clock signal to the processing circuit, and supplies the clock signal to the boosting circuit to operate the clock signal. The boost setting timer monitors the passage of the boost setting time; and the processing control unit turns off the second switching unit and stops supplying the boosting circuit when the boost setting time of the boost setting timer elapses In the state of the clock signal, the first switching unit is activated to supply the clock signal to the processing circuit. And the sleep control unit may stop the supply of the clock signal when the operation of the processing circuit is completed, stop the supply of the clock signal, and start the sleep setting timer to monitor the sleep setting time. When the sleep setting time elapses, the process shifts to the processing of the boosting control unit.

(4) The control circuit may include a control register including a first control bit and a second control bit corresponding to the first switching unit and the second switching unit, and corresponding to the first control bit. And the bit setting and the bit reset of the second control bit, the structure of the supply and stop of the clock signal can be controlled by starting or closing the first switching unit and the second switching unit.

(5) The booster circuit unit may input the reference voltage output from the reference voltage circuit to generate a boost voltage of about twice.

According to the alarm device of the present invention, a processing circuit, a boosting circuit, and a reference voltage circuit that realize the functions of the light-emitting control unit and the fire detecting unit by execution of the program can be provided on the integrated circuit, and the boost voltage can be used to emit light. The external circuitry of the drive is reduced to the necessary minimum. Therefore, according to the present invention, the number of parts and the cost can be reduced.

Further, when a booster circuit is provided in the integrated circuit, a circuit such as a bipolar transistor that does not flow excess base current can be used as the switching element used for the boosting operation. Therefore, according to the present invention, current consumption can be reduced and battery life can be prolonged.

Further, when the boosting circuit operates, the clock supply of the processing circuit is stopped, and when the processing circuit operates, the clock supply of the boosting circuit is stopped, and further, the processing is stopped during the lighting neutral time of a fire detection period such as a 10-second period. The clock is supplied to both the circuit and the booster circuit to form a sleep state. With the above configuration, the current consumption of the integrated circuit can be greatly reduced, and the battery life can be prolonged.

In particular, the operation of the booster circuit, which is performed by stopping the clock supply of the processing circuit, can be boosted with a very small current consumption if the low-speed clock is used to slowly boost, for example, for a period of nearly 300 milliseconds. Therefore, according to the present invention, the current consumption can be greatly reduced as a whole of the integrated circuit, and the battery life can be prolonged.

Further, the booster circuit provided in the integrated circuit can be boosted by inputting a reference voltage from a reference voltage circuit capable of generating a reference voltage of the AD conversion circuit also provided in the integrated circuit. Therefore, according to the present invention, it is possible to easily generate a stable boost voltage without providing a constant voltage circuit.

Further, in the inspection step of the manufacturing stage or the like, the high-speed clock can be selected by external setting, so that the operation of the inspection step can be speeded up, and the work time required for the inspection can be shortened.

Simple illustration

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit block diagram showing an embodiment of an alarm device of the present invention.

Fig. 2 is a circuit block diagram showing the control logic circuit provided in the integrated circuit of the above embodiment.

Fig. 3 is a timing chart showing the fire monitoring control of the above embodiment.

Figure 4 is a flow chart of the above fire monitoring control.

Figure 5 is a circuit block diagram showing a conventional alarm including a conventional constant voltage circuit and an illumination driving circuit.

Fig. 6 is a circuit block diagram showing a conventional alarm device for boosting a capacitor having a smaller charge capacity.

The best form for implementing the invention

Fig. 1 is a circuit block diagram showing an embodiment of a residential alarm (photoelectric smoke sensor) of the present invention. As shown in the figure, the alarm device of this embodiment includes an integrated circuit 10. The integrated circuit 10 is connected to an external circuit.

The integrated circuit 10 is provided with a power supply circuit 12, an MPU 14 having a function of a processing circuit, a boosting circuit 20 capable of generating a boosted voltage for driving light, an AD conversion circuit 22, a reference voltage circuit 24, a control logic circuit 25, Clock circuit 26.

The clock circuit 26 is provided with a clock generating circuit 28 that can generate two types of clock signals of the low speed clock CLK1 and the high speed clock CLK2, and a multiplexer (switching mechanism MUX) 30 that can switch between the output low speed clock CLK1 and the high speed clock CLK2.

The MPU 14 is a so-called single-chip computer. The busbar of the MPU 14 is provided with a RAM, a ROM, and a face portion, and the function of the program can realize the functions of the fire monitoring control unit 16 and the light emission control unit 18.

The booster circuit 20 provided in the integrated circuit 10 is externally connected to a capacitor 34 used for boosting. Further, the reference voltage circuit 24 is externally connected to a capacitor 36 required to stabilize the reference voltage.

The integrated circuit 10 is connected to a battery 38 used as a power source as an external circuit. The battery 38 is used such as a lithium battery or the like. A power supply capacitor 40 is connected to the battery 38.

A boost holding capacitor 42 is provided to charge the boosted voltage output from the booster circuit 20. In addition to the boost holding capacitor 42, a light-emitting drive switch 44 is provided. Further, an LED 46 constituting the light-emitting portion is provided in series with the light-emitting drive switch 44.

The illuminating drive switch 44 can be activated by the illuminating control unit 18 of the MPU 14 in a short time period such as a predetermined lighting period T0 (for example, T0=10 second interval), and supplies the boosted circuit 20 to the LED 46. The boosted booster holds the boosted voltage of the capacitor 42 to cause it to emit light.

The light emitted by the LED 46 emits light to collide with the smoke particles that have flowed into the smoke detecting portion (not shown) to generate scattered light. This scattered light is received by the photodiode 48 constituting the light receiving portion of the light receiving/amplifying circuit 50 externally connected to the integrated circuit 10 to form a light receiving current, and is amplified by the light receiving amplifying circuit 50. Further, a part of the light receiving amplifying circuit 50 may be provided in the integrated circuit 10.

The received light signal from the light-receiving amplifying circuit 50 is digitally converted into light-receiving data in the AD conversion circuit 22 of the integrated circuit 10, and is read by the MPU 14. The light receiving amplifying circuit 50 can be driven in synchronization with the light emission of the LED 46 by the switching of the light receiving synchronous switch 32 of the MPU 14, and amplify the light receiving current.

The fire monitoring control unit 16 provided in the MPU 14 can compare the light receiving data read from the AD conversion circuit 22 with a predetermined degree of fire, and if it exceeds the degree of fire, it is determined that a fire has occurred. Next, the alarm display lamp 52 using the LED shown on the right side of the LED 46 of Fig. 1 is blinked or lit, and the buzzer drive switch 56 is activated to sound an audible alarm by the buzzer 54.

The MPU 14 can activate the switching elements of the communication circuit 58 and, when the other terminals of the communication terminal 60 are connected, output a communication signal by circulating a communication current.

The outside of the integrated circuit 10 can be temporarily connected to the inspection switch 62 at the inspection step at the time of its manufacture. The check switch 62 is connected to the control logic circuit 25 of the integrated circuit 10. If the check switch 62 is activated, the control logic circuit 25 will output a selection control signal for the high speed clock CLK2 to the multiplexer 30. Thus, the multiplexer 30 selects the high speed clock CLK2 from the clock generating circuit 28, and supplies the high speed clock CLK2 to the MPU 14 and the boosting circuit 20 via the control logic circuit 25. Next, with respect to the operation of the normal low-speed clock CLK1, the high-speed operation of the MPU 14 and the booster circuit 20 can be checked in a short time.

The control logic circuit 25 provided in the integrated circuit 10 controls the supply and stop of the clock signals to the MPU 14 and the booster circuit 20. In the present embodiment, during the lighting period of T0=10 seconds, the boosting setting time T1 is first passed, and the control logic circuit 25 supplies the clock signal to the boosting circuit 20 while stopping the supply of the clock signal to the MPU 14. Next, the supply of the clock signal can operate the booster circuit 20 in the time T1 and sequentially charge the boosted voltage required to cause the boost holding capacitor 42 to emit light.

After the boosting operation in the boost setting time T1 is completed, the control logic circuit 25 stops supplying the clock signal to the boosting circuit 20, and switches to supply the clock signal to the MPU 14. Thereby, the MPU 14 can be operated to perform the following operations: the illumination control of the LED 46 of the illumination control unit 18; and the signal obtained by the optical diode 48 receiving the scattered light and then being optically amplified is converted into the received light data by the AD conversion circuit 22 and The fire monitoring control unit 16 compares the received light data with the degree of fire to detect whether or not the fire has occurred.

After the processing of the light emission control unit 18 and the fire monitoring control unit 16 is completed, the MPU 14 outputs a control signal to the control logic circuit 25. Next, the supply of the clock signal to the booster circuit 20 is stopped, and the supply of the clock signal to the MPU 14 is stopped, and the sleep mode in which the supply of the clock signals to the MPU 14 and the booster circuit 20 is stopped is entered.

The sleep mode described above will continue to be maintained by the timer monitoring during the sleep set time T2. Once the sleep set time T2 has elapsed, the control logic circuit 25 will begin to supply the clock signal to the boost circuit 20, and begin the processing of the next illumination drive cycle, and repeats.

2 is a circuit block diagram showing the MPU 14, the boosting circuit 20, the clock generating circuit 28, and the multiplexer 30 simultaneously with the details of the control logic circuit 25 of the present embodiment.

As shown in the above figure, the control logic circuit 25 includes a control register 64, a boost setting timer 72, a sleep setting timer 74, an OR gate 76, an inverter 78, and an AND gate 80 having a first gate switch function. The AND gate 82 of the second gate switch function.

The control register 64 is, for example, an 8-bit register, wherein any three bits are divided into an MPU clock control bit 66, a boost clock control bit 68, and a clock select bit 70.

The MPU clock control bit 66 and the boost clock control bit 68 of the control register 64 can be controlled by a boost setting timer 72, a sleep setting timer 74, an OR gate 76, and an inverter 78. Meta-set, bit reset.

The boost setting time T1 required for the boosting operation of the booster circuit 20 is set in the boost setting timer 72. Further, the sleep setting time T2 is set in the sleep setting timer 74. In the present embodiment, since the light-emission driving is intermittently performed with a certain period T0 = 10 seconds, the boost setting time T1 such as the boost setting timer 72 is set to about 300 msec. Further, the sleep setting time T2 of the sleep setting timer 74 is set to, for example, T2 = about 9.6 seconds. Therefore, the action time of the MPU 14 is approximately allocated to 100 milliseconds. Of course, the action time of the MPU 14 is different depending on the processing status at that time, and the change in a certain range is not affected by the control of the timer setting.

If the MPU clock control bit 66 of the control register 64 is set to bit 1, the permission state of the AND gate 80 is formed, and the clock signal selected by the multiplexer 30 can be supplied to the MPU 14 to operate.

Moreover, the boost clock control bit 68 of the control register 64 is also the same. If it is set to the bit 1, the permission state of the AND gate 82 is formed, and the booster circuit 20 can be supplied with the clock signal from the multiplexer 30. Let it perform the boosting action.

Fig. 3 is a timing chart showing the operation of the MPU 14 and the booster circuit 20, which are affected by the supply and stop of the clock signal by the control logic circuit 25 shown in Fig. 2. That is, (A) of Fig. 3 shows the operation of the MPU 14, the (B) of Fig. 3 shows the MPU clock control bit 66 of the control register 64, and (C) of Fig. 3 shows the control register 64. The boost clock controls bit 68. Further, (D) of FIG. 3 shows the boost setting timer 72, (E) of FIG. 3 shows the sleep setting timer 74, and (F) of FIG. 3 shows the operation of the booster circuit 20.

In Fig. 3, power is supplied to the MPU 14 at time t1. This power supply is actually installed when the battery is installed in the alarm device for the home.

Once the MPU 14 is operated by the power supply at time t1, the MPU clock control bit 66 of the control register 64 receives the bit 0 of the current boost setting timer 72 as the bit inverted by the inverter 78. The setting of 1 is in the permission state of the AND gate 80, and the multiplexer 30 selects the normal low speed clock CLK1 output from the clock generating circuit 28, and supplies the MPU 14 to operate.

By the operation of the MPU 14 at the above-mentioned time t1 to t2, the initial judgment and the initial setting can be performed, and the MPU can be placed in the work state.

At time t2, once the MPU 14 completes the self-determination and initial setting with the power-on, the MPU 14 outputs a setting signal to the boost setting timer 72 via the OR gate 76 to activate the boost setting timer 72.

The boost setting timer 72 is started by the MPU 14 and the timer output is raised from the previous level 0 to level 1. Second, the inverse conversion caused by the inverter 78 causes the MPU clock control bit 66 to be reset from the previous bit 1 to the bit 0, and the boost clock control bit 68 is set to the bit from the previous bit 0. 1.

Therefore, the AND gate 80 will be in the disabled state to stop supplying the clock signal to the MPU 14, and the AND gate 82 is in the permission state, and the supply of the clock signal to the booster circuit 20 is started.

The booster circuit 20 that receives the supply of the clock signal can input the reference voltage output from the reference voltage circuit 24 shown in FIG. 1 as the power supply voltage, and the boost transfer capacitor is used by the charge transfer operation of the externally connected capacitor 34. 42 performs sequential charging of the boosting voltage to generate a boosting voltage such as twice the reference voltage.

At time t3, if the boost setting timer 72 obtains the boost setting time T1 and the timing is reached, the output of the boost setting timer 72 will be reduced from the previous level 1 to the level 0, and the MPU clock control bit 66 is borrowed. Inverter 78 is set to bit 1, and boost clock control bit 68 is instead reset to bit 0.

Therefore, the AND gate 82 stops the supply of the clock signal to the booster circuit 20 and stops the boosting operation, while the AND gate 80 is in the permission state, and supplies the clock signal to the MPU 14 to operate it.

When the MPU 14 is supplied with the clock signal from the time t3, the light-emission control unit 18 shown in Fig. 1 can activate the light-emission drive switch 44 for a short period of time in the microsecond range, and supply the boost-holding for the LED 46. The boosted voltage held by the capacitor 42 causes it to emit light.

The light emitted by the LED 46 is scattered by the smoke particles that have flowed into the smoke detecting portion, and is received by the photodiode 48 to obtain a light receiving current. At this time, the MPU 14 temporarily activates the light receiving synchronous switch 32 in synchronization with the light emission driving, and supplies power to the light receiving amplifying circuit 50 to operate it. Thereby, the light-receiving amplifying circuit 50 can amplify the received light signal of the optical diode 48 and output it, and the received light signal is input to the AD conversion circuit 22 to be converted into light-receiving data, and stored in the MPU 14.

The fire monitoring control unit 16 of the MPU 14 compares the received light data read from the AD conversion circuit 22 with a predetermined degree of fire, and if it is below the fire level, the continuous processing is terminated. Next, at time t4 of FIG. 3, the MPU clock control bit 66 of the control register 64 provided in the control logic circuit 25 will be reset from bit 1 to bit 0, and the sleep setting timer 74 will be reset. Start it.

Thereby, both the MPU clock control bit 66 and the boost clock control bit 68 of the control register 64 can be made to bit 0, and the AND gates 80 and 82 are in a disabled state, and enter the pair MPU 14 and the booster circuit 20 Both sides stop supplying the sleep state of the clock signal.

Thereafter, if the sleep setting timer 74 is reached to the sleep set time T2 at time t5, the timer output is reduced from level 1 to level 0. Since the cause is the inverse conversion output, the boost setting timer 72 is set to the level 1 via the OR gate 76, and is reset and restarted from the time t5.

Once the boost set-up timer 72 is reset and then enabled, the boost clock control bit 68 is set to bit 1 and the AND gate 82 is asserted. Next, the booster circuit 20 is supplied with a clock signal, and the boosting operation is performed again during the boost set time T1.

Then, if the boost setting timer 72 is timed after the T1 time, the boost clock control bit 68 is reset to the bit 0 at time t6, and the MPU clock control bit 66 is set to the bit 1. As a result, the supply of the clock signal to the booster circuit 20 via the AND gate 82 will cease, and the supply of the clock signal to the MPU 14 via the AND gate 82 will begin. Then, in the time t6 to t7, the processing operation of the light emission control unit 18 and the fire monitoring control unit 16 by the MPU 14 in Fig. 1 is performed, and the predetermined period T0 is repeated.

Fig. 4 is a flow chart showing the fire monitoring control of the present embodiment, which will be described below with reference to Fig. 2.

In Fig. 4, the power is turned on, that is, once the power is supplied by the installation of the battery 38, the MPU start processing is executed in step S1.

Next, in step S2, the MPU 14 resets the MPU clock control bit 66 of the control register 64 to bit 0, and sets the boost clock control bit 68 to bit 1 in step S3. Further, in step S4, the boost setting timer 72 is reset and then activated.

Therefore, in step S5, the clock signal is supplied to the MPU 14 by the AND gate 80, and the clock signal is supplied to the booster circuit 20 by the AND gate 82, and the boosting operation of the booster circuit 20 is performed.

Next, in step S6, the timing of monitoring the boost setting timer 72 is reached until the timing of the boost setting time T1 is reached, and the process proceeds to step S7. In step S7, the MPU clock control bit 66 is set to bit 1, and the boost clock control bit 68 is reset to bit 0.

As a result, in step S8, the MPU 14 operates to perform lighting control and fire monitoring control. When the processing of the MPU 14 is completed in step S8, the MPU clock control bit 66 is reset to the bit 0 in step S9, whereby the supply of the clock signal to the MPU 14 by the AND gate 80 is stopped.

At the same time, in step S10, the reset sleep setting timer 74 is restarted. Thereby, in the set time T2 of the sleep setting timer, the supply of the clock signal to the MPU 14 and the boosting circuit 20 is stopped, and a sleep state in which power consumption can be suppressed is formed.

Next, in step S11, when it is determined that the timing of the boost setting timer 72 has expired, the process returns to step S3, and the boosting clock control bit 68 is set to bit 1, and the boosting operation of the boosting circuit 20 is started. Repeat the same process.

Further, as will be described with reference to Fig. 1, when the integrated circuit 10 is activated by the external connection check switch 62 at the inspection step of the manufacturing stage of the factory, the MPU 14 and the booster circuit 20 can be operated by the high-speed clock CLK2. .

That is, in the control logic circuit 25 of Fig. 2, once the check switch 62 of Fig. 1 is activated, the clock selection bit 70 of the control register 64 is set to be, for example, bit 1. When the bit 1 is set, the multiplexer 30 selects the high-speed clock CLK2 and the low-speed clock CLK1 output from the clock generating circuit 28, and outputs the high-speed clock CLK2.

Therefore, when the alarm of this embodiment is operated in the checking step, the high speed clock CLK2 selected by the multiplexer 30 is supplied to the boosting circuit 20 and the MPU 14. As a result, the predetermined period T0=10 seconds shown in the timing chart of FIG. 3 is switched to a shorter period due to the supply of the high-speed clock CLK2, and the boosting operation, the illuminating driving, and the fire monitoring control are repeated in a short period. The action.

The operation time at this time is a short period corresponding to a certain multiple of the high-speed clock CLK2 to the low-speed clock CLK1, and the inspection results can be obtained by executing each item in a short time for various inspection items performed in the inspection step.

After the inspection step is completed, the inspection switch 62 shown in Fig. 1 is opened by the external connection. After the check switch 62 is removed and opened, the clock select bit 70 of the control register 64 of FIG. 2 will be fixed to, for example, bit 0. Therefore, the multiplexer 30 will select the clock signal of the normal state of the low speed clock CLK1 of the output clock generating circuit 28.

Further, in the above embodiment, the reference voltage circuit 24 provided in the integrated circuit 10 of Fig. 1 can internally generate the reference voltage, but the reference voltage can also be selectively input from the outside by the register control. Generated by setting the voltage.

Moreover, the control logic circuit 25 shown in the above embodiment is only an example. Any circuit that can achieve the same function can be configured by a suitable circuit, and further, not limited to the logic circuit, can also be implemented by a firmware (control program). The form of function is realized.

Further, the present invention is not limited to the embodiments described above, and includes appropriate modifications without departing from the scope and advantages thereof. Further, the present invention is not limited only by the numerical values shown in the above embodiments.

Industry availability

According to the present invention, even if it is necessary to boost the light emission, the current consumption can be further reduced to extend the battery life while reducing the number of parts and cost.

10. . . Integrated circuit

12. . . Power circuit

14. . . MPU

16. . . Fire monitoring and control department

18. . . Illumination control unit

20. . . Boost circuit

twenty two. . . AD conversion circuit

twenty four. . . Reference voltage circuit

25. . . Control logic

26. . . Clock circuit

28. . . Clock generation circuit

30. . . Multiplexer

32. . . Optical synchronous switch

34. . . Capacitor

36. . . Capacitor

38. . . battery

40. . . Power supply capacitor

42. . . Boost holding capacitor

44. . . Illuminated drive switch

46. . . led

48. . . Light diode

50. . . Light-receiving circuit

52. . . Alarm display light

54. . . buzzer

56. . . Buzzer drive switch

58. . . Communication circuit

60. . . Communication terminal

62. . . Check switch

64. . . Control register

66. . . MPU clock control bit

68. . . Boost clock control bit

70. . . Clock selection bit

72. . . Boost setting timer

74. . . Sleep setting timer

76. . . OR gate

78. . . inverter

80. . . AND gate

82. . . AND gate

100. . . Illumination drive circuit

102. . . battery

104. . . Constant voltage circuit

106. . . Capacitor

108. . . Switching element

110. . . Capacitor

111. . . resistance

112. . . resistance

114. . . Switching element

116. . . led

118. . . MPU

120. . . Light diode

122. . . Light-receiving circuit

126. . . Capacitor

128. . . Switching element

130. . . Capacitor

132. . . Countercurrent prevention diode

134. . . Switching element

136. . . Countercurrent prevention diode

138. . . Capacitor

140. . . Switching element

142. . . Constant voltage circuit

CLK1. . . Low speed clock

CLK2. . . High speed clock

S1~S11. . . step

T0. . . Luminous period, certain period, predetermined period

T1. . . Boost set time

T2. . . Sleep setting time

T1~t7. . . time

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit block diagram showing an embodiment of an alarm device of the present invention.

Fig. 2 is a circuit block diagram showing the control logic circuit provided in the integrated circuit of the above embodiment.

Fig. 3 is a timing chart showing the fire monitoring control of the above embodiment.

Figure 4 is a flow chart of the above fire monitoring control.

Figure 5 is a circuit block diagram showing a conventional alarm including a conventional constant voltage circuit and an illumination driving circuit.

Fig. 6 is a circuit block diagram showing a conventional alarm device for boosting a capacitor having a smaller charge capacity.

10. . . Integrated circuit

12. . . Power circuit

14. . . MPU

16. . . Fire monitoring and control department

18. . . Illumination control unit

20. . . Boost circuit

twenty two. . . AD conversion circuit

twenty four. . . Reference voltage circuit

25. . . Control logic

26. . . Clock circuit

28. . . Clock generation circuit

30. . . Multiplexer

32. . . Optical synchronous switch

34. . . Capacitor

36. . . Capacitor

38. . . battery

40. . . Power supply capacitor

42. . . Boost holding capacitor

44. . . Illuminated drive switch

46. . . led

48. . . Light diode

50. . . Light-receiving circuit

52. . . Alarm display light

54. . . buzzer

56. . . Buzzer drive switch

58. . . Communication circuit

60. . . Communication terminal

62. . . Check switch

CLK1. . . Low speed clock

CLK2. . . High speed clock

Claims (5)

An alarm device includes: a light emitting portion; a battery power source; a boosting circuit that boosts a voltage of the battery power source to generate a boosting voltage; and an emission control unit that controls the boosting circuit to obtain the boosted voltage At the time point, the boosted voltage is supplied to the light-emitting portion to be intermittently driven to emit light; the light-receiving portion receives the scattered light that is scattered by the light from the light-emitting portion and is scattered by the smoke; and the conversion circuit can receive the light from the light-receiving portion The part of the received light signal is converted into light receiving data; the fire detecting unit detects the fire based on the light receiving data from the converting circuit; and the alarm unit outputs an alarm according to the fire detecting signal from the fire detecting unit; the reference voltage circuit can Generating a reference voltage corresponding to the booster circuit and the conversion circuit; and a clock circuit for outputting a clock signal for operating the booster circuit, the light-emitting control unit, and the conversion circuit; a processing circuit for the function of the light emission control unit and the fire detecting unit, the boosting circuit, Said conversion circuit, the reference voltage circuit, clock circuit and the control circuit section of each of the circuit lines is provided on the packaged integrated circuit. The alarm device of claim 1, wherein the control circuit corresponding to the clock circuit comprises: a clock generating circuit capable of outputting a low speed clock signal and a high speed clock signal; and a switching mechanism for selecting the low speed clock signal or the high speed clock signal. And a control unit that causes the switching mechanism to selectively output the high-speed clock signal when the test mode is set, and causes the switching mechanism to select and output a low-speed clock when the non-test mode is set. The alarm device of claim 1, wherein the control circuit corresponding to the processing circuit and the boosting circuit includes: a first switching unit that enables the clock signal supplied to the processing circuit by the clock circuit to be turned on or off The second switching unit may turn on or off the clock signal supplied from the clock circuit to the booster circuit; the boost setting timer may set an operation time of the booster circuit; and the sleep setting timer may set the foregoing a sleep control unit that can turn on the first switching unit and stop supplying the clock signal to the processing circuit, and activate the second switching unit to supply the clock signal to the boosting circuit. By operating the boost setting timer and monitoring the boost setting time, the processing control unit can turn off the second switching unit when the boost setting time of the boost setting timer elapses. Stopping the supply of the clock signal to the booster circuit, starting the first switching unit and processing the processing And the sleep control unit is configured to stop the supply of the clock signal when the operation of the processing circuit is completed, to stop the supply of the clock signal, and to activate the sleep setting timer to monitor the sleep setting. The passage of time passes to the processing of the boosting control unit when the sleep setting time elapses. The alarm device of claim 3, wherein the control circuit includes a control register, and the control register includes a first control bit and a second control bit corresponding to the first switching unit and the second switching unit. And the first switching unit and the second switching unit are activated or deactivated to control the clock signal according to the bit setting and the bit reset corresponding to the first control bit and the second control bit. Supply and stop. The alarm device of claim 1, wherein the booster circuit unit can input the reference voltage outputted by the reference voltage circuit to generate a boost voltage of about twice.