JPH0454911B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a battery dead/removal detection circuit suitable for use in a power supply circuit, etc. that supplies power obtained from a primary battery used as a main power source to various parts of the circuit to drive the circuit. Regarding.

Among conventional crime prevention abnormality detectors, radiant energy detection devices installed on the walls and ceilings of rooms and corridors, for example, detect radiant energy ( For example, heat rays) are condensed onto a radiant energy detection sensor, and the output of the radiant energy detection sensor obtained at this time is filtered by a filter circuit. etc.), it is designed to detect and notify when an intrusion occurs.

By the way, such a radiant energy detection device will stop its detection function as described above if the electric wire supplying power to the device is cut off for some reason, so such a detection function cannot be used. When it is desired to maintain functionality at all times, it is considered desirable to supply power to the circuit using a battery. However, in this case, if this battery runs out or is removed, not only will the circuit no longer function properly, but if you are not aware of this, the output of this radiant energy detection device will be monitored. On the monitor side, there was a risk that it would be assumed that no intrusion of the heating element had occurred.
This is also a problem when the battery is used as a primary battery as a main power source without requiring an external power source, and since it is used as a main power source, it is necessary to keep power consumption as low as possible.

The object of the present invention is to provide a battery deadness/removal detection circuit that can reduce power consumption and reliably detect deadness or removal of a primary battery used as a main power source. 9
The power obtained by b is supplied to each part of the circuit via the power line 8, and is provided in a power supply circuit that drives each part of these circuits, and the power supply voltage from the primary battery input to this power supply circuit is In a dead battery/removal detection circuit that detects whether the battery is normal or not, the power supply voltage from the primary battery is compared with a predetermined set voltage, and if it is lower than the set voltage, it is grounded and the power supply voltage is abnormal. A power supply voltage detection circuit 16 that outputs a voltage down signal indicating that
and a first switching means 32 that turns off when the primary battery is removed or when the power supply voltage detection circuit outputs a voltage down signal, and turns on when the first switching means is in the off state. charging/discharging means 36, 39 that charge the power supply voltage from the primary battery and discharge it to the second switching unit when the primary battery is removed; a third switching means 2 that turns on and off based on the output indicating normality of the power supply voltage detection circuit;
1, 22, 24, and two sets of contacts connected between each input of the third switching means and the second switching means and the ground line 11, and the power source of the primary battery is The output of the third switching means during normal operation or the output of the charging/discharging means from the second switching means during abnormal operation connects one of the windings connected to each of the two sets of contacts, respectively. It is characterized by comprising a latch type relay circuit 25 which is driven to simultaneously switch the two sets of contacts and output either a signal indicating that the power supply voltage of the primary battery is normal or abnormal. .

An embodiment of the present invention will be described below with reference to the drawings.

First, before explaining the dead battery/removal detection circuit according to the present invention, a radiant energy detection device to which the present invention is applied will be briefly explained.

FIG. 1 is a perspective view showing an example of a condensing plate of a general radiant energy detection device. In this diagram,
Reference numeral 1 denotes a concave body constituting the base of the light condensing plate 2, and a plurality of concave reflecting mirrors 3 are provided on the inner surface of the concave body 1.
a to 3n are provided respectively. Concave reflector 3a
has a concave radius twice that of the concave body 1, and a radiant energy detection sensor 4 is provided on the reflection axis of this concave reflector 3a. Further, the concave reflecting mirrors 3b to 3n are configured similarly to the above-mentioned concave reflecting mirror 3a, and these concave reflecting mirrors 3
b~3n reflection axis is the radiant energy detection sensor 4
It intersects the reflection axis of the concave reflection mirror 3a at the top. In this way, in this condensing plate 2, the concave radius of the concave reflecting mirrors 3a to 3n is set to the concave body 1.
Each of these concave reflecting mirrors 3a to 3n
Since each of the areas has an independent warning area (light collection area), if the radiation energy from the moving heating element is collected by the light collection plate 2, this heating element will be able to The amount of heat rays collected on the radiant energy detection sensor 4 changes each time the light enters or exits the light area. Therefore, by detecting the output change of the radiant energy detection sensor 4 and using a filter to discriminate the frequency, it is possible to distinguish between a stationary heating element (for example, a lamp, a heater, etc.) and a moving heating element. can be identified.

Next, a description will be given of the main circuit of the radiant energy detection device based on the above-mentioned principle of detecting a moving heating element, and the battery dead/removal detection circuit of the present invention for detecting a power supply abnormality of the main circuit.

FIG. 2 is a diagram showing an example of a main circuit of a radiant energy detection device and an example of a dead battery/removal detection circuit according to the present invention. The main circuit and battery dead/removal detection circuit will be explained in sequence below with reference to this figure.

First, the main circuit 5 is connected to the light condensing plate 2 (see FIG. 1).
It is composed of a pyroelectric detector (radiant energy detection sensor) for detecting hot rays focused by a pyroelectric detector 4 and a processing circuit 6 that processes the output of this pyroelectric detector 4. 4 output change processing circuit 6
When the resulting signal is higher or lower than a predetermined reference voltage and the polarity is reversed, an alarm signal is sent to the monitor circuit indicating that a moving heating element has been detected.

Next, the battery dead/removal detection circuit 7 according to the present invention will be explained. In this battery dead/removal detection circuit 7, reference numeral 8 denotes a power line that supplies voltage obtained by the batteries 9a and 9b to various parts of the circuit, and one end of a capacitor 10 is connected to this power line 8. The capacitor 10 is for dropping the noise on the power supply line 8 to the ground line 11. The other end of the capacitor 10 is connected to the ground line 11 (grounded), and the one end of the capacitor 10 is connected to the resistor 12. connected to one end of the The other end of resistor 12 is variable resistor 1
3. It is grounded through resistors 14 and 15 in sequence, and the connection point between this resistor 12 and the variable resistor 13 is connected to the sliding terminal of the variable resistor 13, and the voltage detection circuit 16 ( The resistor 14 and the resistor 15 are connected to the terminal 16a of the power supply voltage detection circuit).
The connection point with the voltage detection circuit 16 is grounded via the capacitor 17, and is also connected to the terminal 16b of the voltage detection circuit 16. The voltage detection circuit 16 compares the reference voltage _Vf provided therein with the voltage _V1 applied to the terminal 16b, and depending on the comparison result, puts the terminal 16c in a flow state or in a grounded state. This voltage detection circuit 16
A terminal 16d is connected to the power supply line 8, a terminal 16e is grounded, and a terminal 16c is connected to the connection point between the resistor 18 and the capacitor 19. The resistor 18 has one end (the terminal not connected to the capacitor 19) connected to the power supply line 8, and the capacitor 19 has one end (the terminal not connected to the resistor 18) connected to the power supply line 8.
The connecting point of the resistor 18 and capacitor 19 is connected to the base of a transistor 21 via a resistor 20. The transistor 21 is turned on when the terminal 16c of the voltage detection circuit 16 is in a flow state, and the collector of the transistor 21 is connected to the collector of the transistor 22, and the emitter of the transistor 21 is connected to the collector of the transistor 22. connected to the base. This transistor 22 is the transistor 2
The collector of the transistor 22 is connected to the power supply line 8, and the emitter is grounded via a resistor 23.
Connected to the base of transistor 24. The transistor 24 drives a latch type relay circuit 25 based on the output of the transistor 22, and the emitter of the transistor 24 is grounded, and the collector is connected to the power supply line 8 via a winding 26. . Here, the winding 26 is for switching the switches 27 and 28 in the relay circuit 25, and the common terminal 27a of the switch 27 is grounded, and the terminal 27b of the switch 27 is connected to one end of the capacitor 30 via the coil 29. The terminal 27c of the switch 27 is connected to the base of the transistor 21.

Further, the connection point between the resistor 18 and the capacitor 19 is also connected to the base of a transistor 32 via a resistor 31. The transistor 32 is turned off when the terminal 16c of the voltage detection circuit 16 is grounded and when the power supply voltage is not supplied to the power supply line 8 (when the batteries 9a and 9b are removed). The emitter of the transistor 32 is grounded, and the collector is connected to the power supply line 8 via the resistor 33, the cathode of the diode 34, and the anode of the diode 34 in this order, and the connection between these resistors 33 and the diode 34 is The point is grounded via a resistor 35 and a capacitor 36 in this order. In this case, the capacitor 36 supplies power to the transistor 32 for a predetermined period when power supply voltage is no longer supplied to the power supply line. Further, the collector of the transistor 32 is also connected to the base of a transistor 37. The transistor 37 amplifies the output of the transistor 32;
The emitter of transistor 7 is grounded, and the collector is connected to the base of transistor 38. The transistor 38 drives the relay circuit 25 based on the output of the transistor 37, and the emitter of the transistor 38 is grounded via a capacitor 39, and the cathode of the diode 40 and the anode of the diode 40 are connected in sequence. The collector is connected to the power supply line 8 through the winding 4.
It is grounded via 1. The winding 41 switches the switches 27 and 28 in the relay circuit 25 in the opposite direction to the winding 26. When a drive current flows through the winding 41, the common terminal 28 of the switch 28
a and the terminal 28b are connected, and the common terminal 27a and the terminal 27b of the switch 27 are connected. Here, the common terminal 28a of this switch 28 is grounded, the terminal 28b is connected to the base of the transistor 37, and the terminal 28c is connected to the other end of the capacitor 30 via the coil 42. Also, this capacitor 30
The connection point between the capacitor 30 and the coil 29 is connected to the battery abnormal signal input terminal (not shown) on the monitor circuit side, and the connection point between the capacitor 30 and the coil 42 is connected to the battery normal signal input terminal (not shown) on the monitor circuit side. )It is connected to the.

As described above, in this embodiment, a battery abnormality detection circuit 43 for detecting an abnormality in the batteries 9a, 9b is constituted by the transistors 32, 37, 38, the switch 27, etc., and the transistors 21, 2
2, 24 and the switch 28 etc., the battery 9a,
When battery 9b is replaced and the voltage from these batteries 9a and 9b becomes normal, the battery abnormality detection circuit 43
Normal recovery circuit 44 for automatically resetting the
is configured.

Next, the operation of this embodiment with the above configuration will be explained in the third section.
This will be explained with reference to the waveform diagram shown in the figure.

First, when the batteries 9a and 9b are removed, the voltage of the power supply line 8 is zero as shown in FIG. 3A. Here, when the batteries 9a and 9b are set at time _t0 , the voltage of the power supply line 8 rises to + _Vn , and the power supply voltage is supplied to the terminal 16d of the voltage detection circuit 16 via this power supply line 8, and this voltage detection The reference voltage generation circuit in circuit 16 becomes operational. In this case, the voltage V ₁ applied to the terminal 16b (see FIG. 3B) is higher than the reference voltage V _f output by the reference voltage generation circuit, so the voltage detection circuit 16 puts the terminal 16c into a flow state. (See Figure 3 C). Also, at this time _t0 , charging of the capacitors (charging/discharging means) 36 and 39 is started due to the voltage rise of the power supply line 8, and power is supplied to the transistors 32 and 38, but in this case, the previous abnormality detection Switch 28 in operation
Since the common terminal 28a and the terminal 28b are connected, these transistors (first switching means) 32, 38 and transistor (second switching means) 37 maintain an off state.

Further, in parallel with the above-described operation, at time _t0 , the transistor (third switching means) 2
1, 22, and 24 are also supplied with power. Note that at this time, the capacitor 19 is not yet sufficiently charged and the voltage at the connection point between the capacitor 19 and the resistor 18 (see FIG. 3 D) is almost zero, so these transistors 21, 22, and 24 are It is in the off state. Next, a period _{T 0 (} this period T ₀ is a very short period) passes from time t 0 to time t ₁ , and when the voltage at the connection point between the capacitor 19 and the resistor 18 rises sufficiently, the Darlington connection is established. The transistors 21 and 22 turned on are turned on as shown in FIG. 3E, and the transistor 24 is turned on. As a result, this transistor 24
The drive current flows through the winding 26 through the switch 2
The common terminal 27a and the terminal 27c of the switch 28 are connected, and the ground voltage is supplied to the base of the transistor 21, and these transistors 21, 22, and 24 are turned off, and the common terminal 28a and the terminal 28c of the switch 28 are connected. is connected, and the ground voltage (battery normal signal) shown in FIG. 3H is supplied to the battery normal signal input terminal on the monitor side. In this case,
Since the base current is already flowing through the transistor 32, the switch 28 causes the transistor 37 to
Even if the base of transistor 3 is no longer grounded,
7 and 38 maintain the off state as shown in FIG. Therefore, after a sufficient period of time has elapsed since the batteries 9a and 9b were set (for example, at time t ₂ ),
In the transistors 21, 22, 24, 3
7 and 38 are in the off state, and only the transistor 32 is in the on state as shown in FIG.

Next, in such a state, if even one of the batteries 9a and 9b is removed at time _t3 , the transistor 32 will be turned off and the capacitor 36 will be turned off.
A current flows through the following path: -> resistor 35 -> resistor 33 -> base of transistor 37 -> emitter of transistor 37 -> ground point, transistor 37 is turned on, and transistor 38 is turned on by transistor 37. As a result, a driving current flows through the winding 41 through the path of capacitor 39 → transistor 38 → winding 41 → ground point, energizes this winding 41, and connects the common terminal 28 of switch 28.
a and the terminal 28b are connected, and the transistor 3
7 and 38 are turned off, the common terminal 27a and the terminal 27b of the switch 27 are connected, and the ground voltage (battery abnormality signal) shown in FIG. 3 is supplied to the battery abnormality signal input terminal on the monitor circuit side. . In addition,
At this time, transistors 21, 22, 2
4 maintains the off state as before time _t3 .

Next, at time _t4 , when the batteries 9a and 9b are set again, the operation is similar to that at time _t0 described above, at a point in time ( _time
t ₅ ), the switches 27 and 28 are switched, and the common terminal 27a and the terminal 27c of the switch 27 are switched.
At the same time, the common terminal 28a and the terminal 28c of the switch 28 are connected, and a battery normal signal is supplied to the monitor circuit side. Next, in this state, when the voltages of the batteries 9a and 9b decrease over time and the voltage _V1 applied to the terminal 16b becomes lower than the reference voltage _Vf at time _t6 , the voltage detection circuit 16 detects the voltage at the terminal 16c. is grounded to turn off the transistor 32. As a result, a base current flows through the transistor 37 via the positive electrode terminal of the battery 9a → power line 8 → diode 34 → resistor 33 → base of the transistor 37 → emitter of the transistor 37 → ground point (ground line 11), and the transistor When transistor 37 is turned on, base current is supplied to transistor 38 by transistor 37. As a result, the switches 27 and 28 are switched by the winding 41, and a battery abnormality signal is supplied to the monitor circuit.

In this way, in this battery dead/removal detection circuit, the voltage detection circuit 16 detects the batteries 9a and 9.
b is detected, and when these battery voltages are below a predetermined value (this predetermined value is a value determined by the reference voltage V _f and the voltage division ratio of the resistors 12 to 15), the transistors 37 and 38 are turned on. Since the switches 27 and 28 in the latch type relay circuit 25 are changed over when the battery voltage drops, it is possible to know this voltage drop, and also to know when the batteries 9a and 9b are removed. Sometimes capacitor 3
Since power is supplied to the transistors 37 and 38 by the batteries 6 and 39, it is possible to know even if these batteries are removed. In addition, in this case, in normal times, transistors 37, 38, 21, 22, and 24 are turned off, and only transistor 32, which detects voltage drop, is turned on, so power consumption in normal times can be kept low. .

Furthermore, in the above embodiment, in order to simplify the explanation, it is assumed that the output of the terminal 16c of the voltage detection circuit 16 changes by comparing the reference voltage _Vf and the voltage _V1 , but in reality, the output of the terminal 16a changes. The voltage applied to V ₂ and the voltage V ₁ as the reference voltage
By comparing with _Vf , hysteresis characteristics are given to the operation of the voltage detection circuit 16.

Furthermore, the same effect as in the above embodiment can be obtained by using a one-shot multivibrator in place of the transistors 21, 22 and transistor 32 shown in FIG. In this case, at least one of these multivibrators used in place of the transistor 32 is connected to the power supply line 8.
It goes without saying that even if the voltage of

Further, in the embodiment described above, the battery abnormality detection circuit 43 is reset using the normality recovery circuit 44, but for example, the battery normality recovery circuit is configured with a non-lock switch, and this non-lock switch can be manually operated. Winding 2 by operating
6 may be applied to return the battery abnormality detection circuit 43 to its normal state.

As explained above, the dead battery/removal detection circuit of the present invention uses a latch-type relay that mechanically maintains that state once it is energized and the contact is switched, and when the relay contact is switched. Only the second switching means and the third switching means are turned on, and normally only the first switching means is turned on and the other switching means are turned off, thus reducing the consumption of the battery used as the main power source. , the power consumption of the circuit is reduced to save power, and it is possible to reliably detect when the battery runs out or is removed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a condensing plate of a radiant energy detection device to which the dead battery/removal detection circuit according to the present invention is applied, and FIG. 2 shows the main circuit of this radiant energy detection device and its main circuit. FIG. 3 is a diagram showing an embodiment of the dead battery/removal detection circuit according to the invention. FIG. 3 is a waveform diagram for explaining the embodiment. 9a, 9b...Battery, 16...Voltage detection circuit (power supply voltage detection circuit), 21, 22, 24...Transistor (normality recovery circuit), 26...Winding (normality recovery circuit), 27...Switch (battery abnormality detection circuit) , 28
...Switch (normal return circuit), 32, 37, 38
...Transistor (battery abnormality detection circuit), 36,3
9... Capacitor, 41... Winding (battery abnormality detection circuit).

Claims (1)

[Scope of Claims] 1. Provided in a power supply circuit that supplies power obtained by the primary batteries 9a, 9b to each part of the circuit via the power supply line 8 and drives each part of these circuits,
In a battery dead/removal detection circuit that detects whether the power supply voltage from the primary battery input to the power supply circuit is normal or not, the power supply voltage from the primary battery is compared with a predetermined set voltage, A power supply voltage detection circuit 16 that outputs a voltage down signal indicating that the power supply voltage is abnormal by setting it to a grounded state when the voltage is lower than a set voltage.
and a first switching means 32 that turns off when the primary battery is removed or when the power supply voltage detection circuit outputs a voltage down signal, and turns on when the first switching means is in the off state. charging/discharging means 36, 39 that charge the power supply voltage from the primary battery and discharge it to the second switching unit when the primary battery is removed; a third switching means 2 that turns on and off based on the output indicating normality of the power supply voltage detection circuit;
1, 22, 24, and two sets of contacts connected between each input of the third switching means and the second switching means and the ground line 11, and the power source of the primary battery is The two sets of contacts are switched in conjunction with each other according to the output of the third switching means in a normal state or the output of the charging/discharging means from the second switching means in an abnormal state, and the power supply voltage of the primary battery is changed. A latch type relay circuit 25 that outputs either a signal indicating that the is normal or abnormal.
A dead battery/removal detection circuit characterized by comprising the following.