JP3571571B2 - Power supply for disaster prevention control panel - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power supply device for a disaster prevention monitoring control panel that switches to power supply from a battery at the time of a power outage and continues monitoring for an abnormality such as a fire.
[0002]
[Prior art]
Conventionally, in this kind of disaster prevention monitoring control panel, a power supply system is divided into a plurality of systems, and a power supply circuit using a switching regulator or the like is provided for each system to supply power.
[0003]
FIG. 5 is an example of a conventional power supply device, in which power is supplied to two systems, an internal system and an external system, in which power supply circuits (power supply: PS) 100a and 100b are provided for each system. The AC input of the AC power supply 102 is converted into a DC voltage of, for example, 24 volts and supplied to each system.
[0004]
A battery 103 is provided for backup at the time of a power failure, and the power is supplied by switching to the battery 103 upon detection of the power failure. Therefore, the switching relay contacts nv1 and nv2 of the relays NV1 and NV2 have the a side connected to the battery 103 and the b side connected to the outputs of the power supply circuits 100a and 100b.
[0005]
The battery 103 is constantly charged by stepping down the AC voltage from the commercial AC power supply 102 with the transformer 108 and rectifying it with the charging circuit 109.
[0006]
The relays NV1 and NV2 are controlled by voltage detection circuits 104a and 104b and voltage detection switch circuits 105a and 105b. When a power failure occurs in the commercial AC power supply 102, the power supply voltage from the power supply circuits 100a and 100b decreases, and the voltage detection circuits 104a and 104b turn off the voltage detection switch circuits 105a and 105b when the voltage drops below a predetermined set voltage. The relays NV1 and NV2 are restored. For this reason, the switching relay contacts nv1 and nv2 are switched to the illustrated “a” side to supply power from the battery 103.
[0007]
For battery testing, battery test switching circuits 106a and 106b and test switch circuits 107a and 107b are provided for each system. When the CPU issues a test instruction to the battery test circuits 106a and 106b, the test switch circuits 107a and 107b are turned off, the relays NV1 and NV2 are restored, and the switching relay contacts nv1 and nv2 are switched to the a side. , And a battery test is performed to determine whether the power supply from the battery can be performed normally for a specified time.
[0008]
[Problems to be solved by the invention]
However, in such a conventional power supply device, the large-capacity capacitors C1 and C2 are connected from the power supply circuits 100a and 100b to the output section of the power supply line to the load or the power supply device, thereby supplying power. When the load is light, there is a problem that the switching of the power supply to the battery when the commercial AC power supply fails is delayed.
[0009]
That is, since the large-capacity capacitors C1 and C2 are connected to the power supply line, when the load for supplying power is light, the power supply voltage is slowed down by the capacitors C1 and C2 at the time of a power failure, and thereby the relays NV1 and NV1 Switching of NV2 is delayed. Therefore, the detection accuracy of the voltage detection circuit must be increased, and there is a problem that the circuit becomes complicated.
[0010]
In particular, since the number of loads connected to the outside, for example, the number of district sound devices and smoke prevention devices is determined by the size of the building, such a problem is likely to occur when the number of connections is reduced.
[0011]
The present invention has been made in view of such a conventional problem, and even when a large-capacity capacitor is connected to a power supply line, switching to power supply from a battery at the time of a power failure or the like is easy. It is an object of the present invention to provide a power supply device for a disaster prevention monitoring control panel which can be quickly operated.
[0012]
[Means for Solving the Problems]
To achieve this object, the present invention is configured as follows. First, a power supply device for a disaster prevention monitoring control panel of the present invention includes a transformer for converting an AC input voltage from a commercial AC power supply into a predetermined voltage and inputting the converted voltage to a charging circuit, a battery charged by a rectified output voltage of the charging circuit, and a commercial power supply. A power supply circuit for converting an AC input voltage from an AC power supply into a predetermined DC power supply voltage and supplying the load to a load, and a power supply provided on an output side of the power supply circuit and switching between power supply by the power supply circuit and power supply by a battery The switching relay and the DC power supply voltage from the power supply circuit are monitored, and when the voltage is higher than the predetermined voltage, the power supply switching relay is activated to switch to the power supply from the power supply circuit, and when the voltage is lower than the predetermined voltage. And a DC power monitoring circuit for restoring the power switching relay and switching to power supply from the battery.
[0013]
According to the present invention, such a power supply device for a disaster prevention monitoring control panel monitors an AC output voltage from a transformer, and when the voltage is higher than a predetermined set voltage, activates a power supply switching relay to supply power by a power supply circuit. And an AC power supply monitoring circuit for restoring the power supply switching relay and switching to power supply from the battery when the voltage is lower than a predetermined set voltage.
[0014]
Here, the DC power supply monitoring circuit includes a DC voltage detection circuit that outputs a voltage detection signal according to a case where the DC power supply voltage from the power supply circuit is higher and lower than a predetermined set voltage, and a DC power supply voltage that is higher than a predetermined setting voltage. A first voltage detection switch circuit that is turned on by a voltage detection signal from a DC voltage detection circuit when the voltage is higher than the voltage, and is turned off by a voltage detection signal when the voltage is lower than a predetermined set voltage.
[0015]
The AC power supply monitoring circuit includes an AC voltage detection circuit that outputs an AC voltage detection signal according to a case where the AC output power supply voltage from the transformer is higher and lower than a predetermined set voltage; A second voltage detection switch circuit that is turned on by a voltage detection signal from an AC voltage detection circuit when the voltage is high and turned off by a voltage detection signal when the voltage is low with respect to a predetermined set voltage.
[0016]
Then, the first voltage detection switch circuit and the second voltage detection switch circuit are connected in series to the power supply switching relay, and when one of the switch circuits is turned off, the power supply switching relay is restored to switch to the power supply from the battery.
[0017]
According to such a power supply device of the present invention, the AC output voltage of the battery charging transformer is constantly monitored, and when the AC output voltage becomes equal to or lower than the set voltage, the power supply switching relay in the operating state is restored to restore the battery. Even if the DC power supply monitoring circuit has a delay in detecting a voltage drop at light load due to a large-capacitance condenser on the output side, it switches to the power supply from the battery immediately by monitoring the AC output voltage. be able to.
[0018]
Further, when the power supply device of the disaster prevention monitoring control panel according to the present invention has a plurality of power supply systems, a power supply circuit and a power supply switching relay are provided for each of the plurality of power supply systems, and the DC power supply monitoring circuit includes a plurality of power supply systems. A plurality of DC voltage detection circuits are provided for each circuit and output a voltage detection signal according to a case where the power supply voltage is higher and lower than a predetermined setting voltage, and all of the detection signals by the plurality of DC voltage detection circuits are predetermined. When the voltage is higher than the set voltage, the plurality of power supply switching relays are operated collectively to switch to the power supply from each power supply circuit, and when any of the detection signals is lower than the predetermined set voltage, A switching control circuit for switching to power supply from a battery by collectively restoring the power switching relay.
[0019]
More specifically, the switching control circuit is turned on by a voltage detection signal from the DC voltage detection circuit when the DC power supply voltage is higher than a predetermined set voltage, and turned off by a voltage detection signal when the DC power supply voltage is lower than a predetermined voltage. A series switch circuit in which one voltage detection switch circuit is connected in series, a relay drive circuit in which a plurality of power supply switching relays are connected in parallel, and a photocoupler connected in parallel with the relay drive circuit and transmitting a power supply state signal indicating a power supply switching state to the CPU And a test switch circuit that is turned on and off in response to a battery test instruction from the CPU. The series switch circuit, the relay drive circuit, and the test switch circuit are connected in series, and at least one of the plurality of switch circuits is turned off. Thus, a plurality of power supply switching relays are collectively restored.
[0020]
The plurality of DC voltage detection circuits include a comparator, and the comparator outputs a switch-on voltage detection signal when the DC power supply voltage exceeds a first threshold voltage. It has a hysteresis detection characteristic of outputting a switch-off voltage detection signal when the voltage falls below a low second threshold voltage.
[0021]
For this reason, a single circuit is used for a circuit that sends a state signal indicating a power supply switching state to the CPU for a plurality of power supply systems and a battery switching test circuit that switches a power supply switching relay for a battery test or the like according to an instruction from the CPU. When the number of power supply systems is increased, only a power supply circuit, a voltage detection circuit, a voltage detection switch circuit, and a power supply switching relay need to be added. Even if the number of power supply systems increases, the circuit can be easily changed without drastically changing the circuit.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a circuit block diagram of an embodiment of a power supply device for a disaster prevention monitoring control panel according to the present invention.
[0023]
In FIG. 1, three AC power supply circuits 1a, 1b, and 1c are provided for a commercial AC power supply 2 in this embodiment. DC power is individually supplied to each of the smoke exhausting external units 2.
[0024]
For example, a switching regulator is used as the power supply circuits 1a to 1c. The power supply circuits 1a to 1c receive a commercial AC voltage, convert the AC voltage into a predetermined DC power supply voltage, and output the converted DC power supply voltage. Here, the power supply circuit 1a for supplying power to the inside of the disaster prevention monitoring control panel supplies 24V DC, and the power supply circuits 1b and 1c for supplying power to the outside 1 and the outside 2 for area sound and smoke prevention are, for example, Supply DC 26.4V.
[0025]
1 is provided with a battery 3 for backing up the power supply when the commercial AC power supply 2 fails. The battery 3 inputs an AC power supply voltage from the commercial AC power supply 2 to the transformer 8, converts the AC power supply voltage to a predetermined AC output voltage VAC, for example, AC56V, rectifies it by the charging circuit 9, and constantly charges the battery 3.
[0026]
In order to switch to the power supply of the battery 3 at the time of a power failure, three power supply switching relays NV1, NV2, and NV3 are provided corresponding to the respective power supply systems from the power supply circuits 1a to 1c. The power switching relays NV1, NV2, and NV3 have switching relay contacts nv1, nv2, and nv3. The a side is connected to the battery 3, the b side is connected to the output from the power supply circuits 1a to 1c, and the switching contacts are connected to the inside. , External 1 and external 2 are connected to the power supply line on the load side.
[0027]
As will be described later, the power supply switching relays NV1 to NV3 are based on the supply of AC power from the commercial AC power supply 2 and when the power supply circuits 1a to 1c are normally supplying the DC power supply voltage. All the switches are operated, and the switching relay contacts nv1 to nv3 are switched to the b side to supply the DC power supply voltage from the power supply circuits 1a to 1c to the inside, the outside 1 and the outside 2, respectively.
[0028]
On the other hand, when the power supply voltage from the power supply circuits 1a to 1c is cut off due to a power failure or the like, the power supply switching relays NV1 to NV3 are restored, and the switching relay contacts nv1 to nv3 are switched to the a side so that the power supply from the battery 3 is released. Switch to supply.
[0029]
Such switching control of the operation and restoration of the power supply switching relays NV1 to NV3 is performed by a DC power supply monitoring circuit including DC voltage detection circuits 4a, 4b, 4c and first voltage detection switch circuits 5a, 5b, 5c .
[0030]
The DC voltage detection circuits 4a to 4c input the DC output voltages of the power supply circuits 1a to 1c to built-in comparators and compare the DC output voltages . The voltage detection switch circuits 5a to 5c are turned on. When the DC power supply voltage is lower than a predetermined set voltage, the DC voltage detection signal is set to L level, and the first voltage detection switch circuits 5a to 5c are turned off.
[0031]
In this embodiment, the comparators provided in the DC voltage detection circuits 4a to 4c have hysteresis characteristics. Here, assuming that the power supply voltage for the inside of the power supply circuit 1a is DC 24V and the power supply voltage for the outside 1 and the outside 2 for the district sound and smoke prevention by the power supply circuits 1b and 1c is 26.4V DC, the DC voltage detection is performed. Two threshold voltages Vth1 and Vth2 are set in the comparators provided in the circuits 4a to 4c.
[0032]
This threshold voltage is Vth1 = 16V, Vth2 = 23V in the case of the DC voltage detection circuit 4a monitoring DC24V, and Vth1 = 19V, Vth2 = 25V in the case of the DC voltage detection circuits 4b and 4c monitoring DC26.4V. ing.
[0033]
FIG. 2 shows the hysteresis characteristics of the comparators provided in the DC voltage detection circuits 4a to 4c in FIG. Two threshold voltages Vth1 and Vth2 are set for the input power supply voltage shown on the horizontal axis, and the comparator generates an L level output or an H level output according to the input power supply voltage.
[0034]
When the input power supply voltage increases from 0 V, it does not rise to the H level even when it reaches the first threshold voltage Vth1, and when it reaches the higher threshold voltage Vth2, the comparator output rises to the H level. After the output of the comparator rises to the H level, it does not fall to the L level even if the power supply voltage falls below the higher threshold voltage Vth2, and rises to the L level when the power supply voltage falls below the lower threshold voltage Vth1. Go down. Thus, the comparator output has a hysteresis characteristic with respect to the input of the power supply voltage.
[0035]
Referring again to FIG. 1, three first voltage detection switch circuits 5a to 5c that are turned on and off by voltage detection signals from the DC voltage detection circuits 4a to 4c are connected in series. A parallel circuit of power supply switching relays NV1 to NV3 is connected in series.
[0036]
Further, a light emitting element 10 of a photocoupler for sending a power switching state to a control CPU is connected in parallel to the power switching relays NV1 to NV3. Further, a test switch circuit 7 is connected in series to a parallel circuit of the power supply switching relays NV1 to NV3. The test switch circuit 7 is turned on and off by an output of the battery switching test circuit 6 which operates in response to a battery test instruction from the CPU. Normally, the test switch circuit 7 is on, and when the CPU issues a battery test instruction to the battery switching test circuit 6, the test switch circuit 7 is turned off.
[0037]
According to the present invention, such a DC power supply monitoring circuit is provided with an AC power supply monitoring circuit on the side of the transformer 8 and the charging circuit 9 provided for the battery 3. This AC power supply monitoring circuit includes an AC voltage detection circuit 12 and a second voltage detection switch circuit 13.
[0038]
The AC voltage detection circuit 12 receives, for example, AC56V output from the transformer 8, detects whether the voltage is higher or lower than a predetermined voltage, outputs a voltage detection signal to the second voltage detection switch circuit 13, and turns on and off. I do. Specifically, the AC voltage detection circuit 12 rectifies and smoothes the AC output voltage AC56V from the transformer 8 to convert it to a DC voltage, and then detects the voltage by a comparator similar to the DC voltage detection circuits 4a to 4c.
[0039]
For example, the AC output voltage AC56V from the transformer 8 becomes DC26.4V by performing rectification and smoothing to DC similarly to the rectified output by the charging circuit 9, so that two comparators, Vth1 = 25V and Vth2 = 42V, are set in the comparator. , A change in the AC output voltage AC37V output from the transformer 8 is substantially detected by the hysteresis characteristic.
[0040]
The second voltage detection switch circuit 13 is connected in series with the first voltage detection switch circuits 5a to 5c on the DC power supply monitoring circuit side, and is also connected to the battery by recovery of the power supply switching relays NV1 to NV3 according to the voltage detection signal of the AC voltage detection circuit 12. 3 can be switched to power supply.
[0041]
Further, an integration circuit 11 is provided on the DC power supply monitoring circuit side, and voltage detection signals from DC voltage detection circuits 4b and 4c provided in a power supply system for the area 1 and the area 2 serving as the outside 1 and the outside 2 for smoke prevention. To suppress the fluctuation due to the instantaneous interruption of the power supply voltage or the like, so that the first voltage detection switch circuits 5b and 5c do not malfunction.
[0042]
FIG. 3 is a time chart of the operation of the power supply circuit 1b, the DC voltage detection circuit 4b, and the integration circuit 11, which are the power supply system of the outside 1 in FIG.
[0043]
Assuming that the DC power supply voltage VDC from the power supply circuit 1b is momentarily interrupted as shown in FIG. 3A, the comparator of the DC voltage detection circuit 4b responds to the threshold values Vth1 and Vth2 as shown in FIG. A voltage detection signal which instantaneously falls to the L level and rises to the H level again is output.
[0044]
This voltage detection signal is input to the integration circuit 11, and since the integration circuit has a sufficient time constant for the instantaneous interruption time, the fluctuation of the voltage detection signal is suppressed, and the integration output as shown in FIG. You. Therefore, the first voltage detection switch circuit 5b does not turn off due to an instantaneous interruption of the power supply voltage, and can stably maintain the on state. The same applies to the instantaneous interruption in the DC power supply voltage of the external device 2 for supplying power for smoke emission control.
[0045]
The DC voltage detection circuit 4a for detecting the power supply voltage for supplying power to the inside of the disaster prevention monitoring control panel is relatively stable because power is not supplied to the outside, and there is no possibility of an instantaneous interruption. For this reason, the voltage is supplied directly to the first voltage detection switch circuit 5a without passing through the integration circuit 11, but may be passed through the integration circuit 11 if there is a possibility of a momentary interruption.
[0046]
As the first voltage detection switch circuits 5a to 5c, the second voltage detection switch circuit 13, and the test switch 7, appropriate switch circuits such as relays, transistors, and thyristors can be used.
[0047]
Further, in this embodiment, relatively large-capacity capacitors C1, C2, and C3 are connected to the output-side lines of the internal, external 1, and external 2 power supply systems. Even if the supply of the DC power supply from 1c is cut off, the DC power supply voltage gradually decreases due to the backup of the capacitors C1 to C3. The degree of the decrease in the DC power supply voltage becomes slower at a light load in which the supply current to each load is small.
[0048]
Next, the operation of the embodiment of FIG. 1 will be described. When a power switch provided on the disaster prevention monitoring control panel is turned on, an AC power supply voltage is input from the commercial AC power supply 2, and the power supply circuits 1a to 1c operate, and a predetermined DC power is supplied to the internal, external 1 and external 2 respectively. Supply power supply voltage.
[0049]
When the DC voltage detection circuits 4a to 4c exceed the higher threshold Vth2 of the comparator with respect to the output of the DC power supply voltage, the voltage detection signal is set to the H level, and the first voltage detection switch circuits 5a to 5c are turned on. At the same time, a predetermined AC output voltage is obtained from the transformer 8 by power supply from the commercial AC power supply 2, and charging of the battery 3 is started by rectification by the charging circuit 9.
[0050]
At this time, the AC voltage detection circuit 12 sets the voltage detection signal to the H level when the DC voltage corresponding to the AC output voltage of the transformer 8 exceeds the threshold value Vth2, and turns on the second voltage detection switch circuit 13.
[0051]
Here, since the test switch circuit 7 is in the ON state, the power supply switching relays NV1 to NV3 connected in parallel are operated collectively, and the switching relay contacts nv1 to nv3 are switched to the b side, and the power supply circuits 1a to 1c Are supplied to the internal, external 1 and external 2 systems.
[0052]
In such a normal power supply state, for example, when a power failure occurs in the commercial AC power supply 2, the output voltages of the power supply circuits 1a to 1c are cut off, but the capacitors C1 to C3 provided on the output side of the power supply line are turned off. , The input voltage to the DC voltage circuits 4a to 4c gradually decreases.
[0053]
On the other hand, the AC output voltage from the transformer 8 is cut off at the same time as the power failure, so that the voltage detection signal from the AC voltage detection circuit 12 falls from the H level to the L level immediately after the power failure, and the second voltage detection switch circuit 13 Turn off. For this reason, the power supply switching relays NV1 to NV3 connected in parallel are restored at the same time, and the switching relay contacts nv1 to nv3 are switched to the “a” side, thereby switching to the power supply from the battery 3.
[0054]
As described above, even if the power supply from the power supply circuits 1a to 1c to the battery 3 is switched, the power supply to the internal, external 1, and external 2 is momentarily interrupted, and the large-capacity capacitors C1, C2, and C3 are backed up. There is no effect on each load.
[0055]
FIG. 4 is a time chart of the output of the transformer output voltage VAC, the DC power supply voltage VDC, the DC voltage detection circuit 4b, and the output of the AC voltage detection circuit 12 when the commercial AC power supply fails.
[0056]
As shown in FIG. 4A, when the commercial AC power supply 2 experiences a power failure, the transformer output voltage VAC immediately drops to 0V. On the other hand, as shown in FIG. 4B, for example, the DC power supply voltage VDC of the power supply line from the power supply circuit 1b to the outside 1 is gradually reduced by the capacitor C2.
[0057]
At this time, according to the present invention, since the AC voltage detection circuit 12 for detecting the output voltage of the transformer 8 is provided, as shown in FIG. By falling to the L level and turning off the second voltage detection switch circuit 13, the power supply switching relays NV1 to NV3 are restored and the power supply from the battery is switched.
[0058]
On the other hand, in the DC voltage circuit 4b of the power supply line to which the capacitor C1 is connected, the DC power supply voltage delayed from the power failure at the time t1 as shown in FIG. At time t2 below Vth1, the voltage detection signal is set to L level, and the first voltage detection switch circuit 5b is turned off.
[0059]
For this reason, in contrast to the conventional switching to the standby power supply by monitoring the DC power supply voltage, the switching to the standby power supply by monitoring the AC power supply of the present invention allows the power failure to occur almost without delay such as from time t1 to t2. At the same time, it is possible to switch to the power supply from the battery 3.
[0060]
On the other hand, when the DC output voltage is reduced or cut off due to, for example, a failure of the power supply circuit 1b instead of the power failure of the commercial AC power supply 2, the DC power supply voltage is slowly reduced by the capacitor C2 as shown in FIG. Then, the voltage detection signal from the DC voltage circuit 1b falls to the L level at a certain delay from the time of the power failure due to the failure, and the power supply from the battery 3 is switched.
[0061]
Further, when a battery test instruction accompanying the operation of the battery test switch is issued from the CPU, the battery switching test circuit 6 turns off the test switch circuit 7 in the ON state, thereby recovering the power supply switching relays NV1 to NV3 collectively. Then, the internal, external 1 and external 2 systems are switched to the power supply from the battery 3 and a battery test is performed to determine whether the power supply from the battery 3 can be performed normally for a specified time.
[0062]
Further, in the embodiment of FIG. 1, a plurality of DC power supply voltage supply systems are provided. In this case, a light emitting element 10 of a photocoupler for notifying a CPU of a power supply switching state, a battery switching for a battery test The test circuit 6 and the test switch circuit 7 are provided as a single common circuit without being provided for each system, and therefore all the circuits are provided independently for each system as in the conventional device of FIG. As compared with the case, the circuit configuration when the number of power supply systems is increased can be simplified, and the cost can be reduced.
[0063]
In the above embodiment, the case where the supply system of the DC power supply voltage is three is taken as an example. However, a single system may be used or an appropriate number of plural systems may be used. . Thus, even if the supply system of the DC power supply voltage increases, the circuit configuration of each system is the same, and the number of series connection of the first voltage detection switch circuits and the number of parallel connection of the power supply switching relay increase according to the number of systems. .
[0064]
In addition, the present invention is not limited to the above embodiments, includes appropriate modifications that do not impair the objects and advantages thereof, and is not limited by the numerical values shown in the above embodiments.
[0065]
【The invention's effect】
As described above, according to the present invention, the AC output voltage from the battery charging transformer is constantly monitored, and when the AC output voltage becomes equal to or lower than the set voltage, the activated power supply switching relay is restored. In order to switch to the power supply from the battery, a large-capacity capacitor is connected to the output side of the DC power supply monitoring circuit. It is possible to immediately switch to the power supply from the battery in response to the voltage drop, and a highly reliable battery power backup can be realized.
[0066]
When a plurality of power supply systems of DC power supply are provided, a circuit for sending a state signal indicating a power supply switching state to a control CPU for the number of power supply systems, a power supply switching relay for a battery test or the like according to an instruction from the CPU. The battery switching test circuit that switches the power supply to the battery side can be shared by a single circuit, and when the number of power supply systems is increased, the circuit configuration is significantly changed compared to the conventional device that provided all circuits for each power supply system It is not necessary and can be easily handled.
[Brief description of the drawings]
FIG. 1 is a circuit block diagram showing an embodiment of a power supply device of a disaster prevention monitoring control panel according to the present invention. FIG. 2 is an explanatory diagram of a hysteresis characteristic of a voltage detection circuit of FIG. 1. FIG. Explanatory diagram of voltage fluctuation characteristics at the time of power failure [Fig. 4] Time chart of power supply switching operation at power failure [Fig. 5] Circuit block diagram of conventional device [Explanation of reference numerals]
1a to 1c: power supply circuit (PS1 to PS3)
2: commercial AC power supply 3: batteries 4a to 4c: DC voltage detection circuits 5a to 5c: first voltage detection switch circuit 6: battery switching test circuit 7: test switch circuit 8: transformer 9: charging circuit 10, light emitting element (CPU (For sending)
11: integration circuit 12: AC voltage detection circuit 13: second voltage detection switch circuit

Claims (4)

A transformer that converts an AC input voltage from a commercial AC power supply into a predetermined AC output voltage and supplies the AC output voltage to a charging circuit;
A battery charged by the rectified output voltage of the charging circuit;
A power supply circuit that converts an AC input voltage from a commercial AC power supply into a predetermined DC power supply voltage and supplies the load to a load;
A power supply switching relay provided on the output side of the power supply circuit, for switching power supply by the power supply circuit and power supply by the battery,
The DC power supply voltage from the power supply circuit is monitored, and when the voltage is higher than a predetermined set voltage, the power supply switching relay is operated to switch to the power supply from the power supply circuit. DC power monitoring circuit for restoring the power switching relay and switching to power supply from the battery,
In the power supply unit of the disaster prevention monitoring control panel equipped with
The AC output voltage from the transformer is monitored, and when the voltage is higher than a predetermined set voltage, the power switching relay is enabled to enable switching to the power supply from the power supply circuit. An AC power supply monitoring circuit for restoring the power supply switching relay and switching to power supply from the battery is provided ,
When having a plurality of power supply systems, the power supply circuit and a power supply switching relay are provided for each of the plurality of power supply systems,
The DC power monitoring circuit,
A plurality of DC voltage detection circuits provided for each of the plurality of power supply circuits, and output a voltage detection signal according to a case where the DC power supply voltage from the power supply circuit is higher or lower than a predetermined set voltage,
When all of the detection signals from the plurality of DC voltage detection circuits are higher than a predetermined set voltage, the plurality of power supply switching relays are collectively operated to switch to power supply from each of the power supply circuits, When any of the detection signals is lower than a predetermined set voltage, a switching control circuit that switches to power supply from the battery by collectively restoring the plurality of power switching relays,
Disaster monitoring control panel of the power supply apparatus characterized by comprising a. The power supply for a disaster prevention monitoring control panel according to claim 1,
The DC power monitoring circuit,
A voltage detection signal that is provided for each of the plurality of power supply circuits and is turned on by a voltage detection signal from the DC voltage detection circuit when the DC power supply voltage is higher than a predetermined set voltage; A plurality of first voltage detection switch circuits that are turned off by a signal;
With
The AC power supply monitoring circuit,
An AC voltage detection circuit that outputs an AC voltage detection signal according to a case where the AC output voltage from the transformer is higher or lower than a predetermined set voltage,
A second voltage detection switch circuit that is turned on by a voltage detection signal from the AC voltage detection circuit when the AC output voltage is higher than a predetermined set voltage, and is turned off by a voltage detection signal when the AC output voltage is lower than the predetermined set voltage;
With
The plurality of first voltage detection switch circuits and the second voltage detection switch circuits are connected in series to the power switching relay, and when any one of the switch circuits is turned off, the power switching relay is restored to switch to power supply from a battery. Power supply for disaster prevention monitoring and control panel. The power supply device for a disaster prevention monitoring control panel according to claim 2 ,
The switching control circuit,
A series connection in which a plurality of first voltage detection switch circuits, which are turned on by a voltage detection signal from the DC voltage detection circuit when the DC power supply voltage is higher than a predetermined set voltage and turned off by a voltage detection signal when the DC power supply voltage is low, are connected in series. A switch circuit;
A relay drive circuit in which the plurality of power supply switching relays are connected in parallel;
A light-emitting element of a photocoupler that is connected in parallel to the relay drive circuit and sends out a power state signal indicating a power switching state,
A test switch circuit that is turned on and off by a battery test instruction from the CPU;
With
Disaster prevention monitoring control , wherein the series switch circuit, the relay drive circuit, and the test switch circuit are connected in series, and when at least one of the plurality of switch circuits is turned off, the plurality of power supply switching relays are collectively restored. Panel power circuit. 2. The power supply unit for a disaster prevention monitoring control panel according to claim 1 , wherein the plurality of DC voltage detection circuits include a comparator, and the comparator detects the voltage for switching on when the power supply voltage exceeds a first threshold voltage. A signal for outputting a signal and then outputting a switch-off voltage detection signal when the power supply voltage falls below a second threshold voltage lower than the first threshold voltage. apparatus.

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