JPH0216291Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention includes first and second contacts 17a and 17b that detect power outages and open phases of three-phase alternating current and turn on the contacts;
and a third contact 10a that is turned on during normal operation, and a power outage/open phase detection circuit 60 that generates an “L” level detection signal intermittently at a constant cycle during a single phase out during a power outage, A storage battery 42 is connected in parallel via a rectifier 41 to the secondary side of a step-down transformer 40 whose primary input is any two wires of the three-phase alternating current, and an open contact 43a, a display contact 43b, and a connection contact 43c.
A first circuit has an input contact 43d and connects the input contact 43d and the open contact 43a, a second circuit connects the input contact 43d and the display contact 43b, and connects the input contact 43d and the connection contact 43c. The positive electrode of the storage battery 42 is connected to the input contact 43d of a changeover switch 43 which has a third circuit that allows each circuit to be switched freely, and the other end of the load resistor 44 connected to the display contact 43b is grounded. A series circuit consisting of a display element 46 for displaying the state of charge of the storage battery is connected in parallel to the load resistor 44, and a connection contact 43c of the changeover switch 43 is connected to the third contact 10a, the current limiting resistor 47, and a display for confirming normal display. It is like an inverter oscillation circuit that connects a normal display circuit 49 configured in a series circuit with an element 48, and grounds the other end of the normal display circuit 49, and alternately lights up two display elements 50a and 50b for displaying an abnormality. An oscillation circuit 51 is connected to the connection contact 43c via the first contact 17a, and a programmable unijunction transistor 53, the second contact 17b and the buzzer 5 are connected to each other.
A series circuit consisting of a ringing device such as 4 and a switch element 55 which is turned on and off by the oscillation circuit 51 is connected in parallel to the normality display circuit 49, and a programmable
An NO-type stop switch 56 is connected between the anode A and the cathode K of the union transistor 53.
At the same time, a bias resistor 57 is inserted between the cathode and the ground, and the power failure/open phase detection circuit 6
The present invention relates to a power outage/open phase display circuit which inputs a detection signal generated by 0 to the gate G of the programmable disjunction transistor 53 to turn on the programmable disjunction transistor 53. The aim is to detect power outages and phase loss in three-phase AC, and to notify the outside world of power failures and phase loss, as well as to display normal operation and the state of charge of the storage battery used to drive the circuit. To provide display circuits.

The present invention will be explained in detail with reference to the drawings. The attached drawings show one embodiment of the invention. First, the power failure/open phase detection circuit 60 that drives the circuit of the present invention will be explained. That is, the three-phase alternating current of each electric circuit 21a, 21b, 21c is step-down rectified by the step-down resistors 22a, 22b, 22c and the rectifier 1a to become a pulsating voltage, and this pulsating voltage has its DC component cut by the Zener diode 2. Thereafter, the voltage is divided by the voltage dividing resistors 3 and 4 and inputted to the positive phase input terminal of the comparator 8. Further, the pulsating current voltage is stepped down by a diode 23 and a resistor 24, divided by voltage dividing resistors 4 and 5, and inputted to the negative phase input terminal of the comparator 8. Note that 1b, 1c, and 1d are resistors, Zener diodes, and capacitors that smooth and stabilize the pulsating voltage to obtain a DC voltage, respectively.
5 and 26 are stabilizing capacitors. When the three-phase AC power supply is normal, the positive phase input terminal voltage is always higher than the negative phase input terminal voltage, so the comparator 8 is turned off and the capacitor 11b is connected to the resistor 11.
When the terminal voltage of the capacitor 11b charged through the capacitor 11b increases (the voltage at the point in the figure) and becomes larger than the voltage divided by the voltage dividing resistors 26a and 26b, the programmable unification Transistor 9 (hereinafter referred to as PUT9) becomes conductive. At this time, the electric charge charged in the capacitor 11b flows through the reset coil 10 of the latching relay, which will be described later.
The NO type third contact 10a is turned on. PUT
Since the capacitor 9 returns to off when the charge on the capacitor 11b disappears, the reset coil 10 is periodically energized.

Next, when the three-phase alternating current has an open phase, voltages having opposite phases are periodically input to the positive and negative phase terminals of the comparator 8, and the output of the comparator 8 is periodically turned on. At this time, the terminal voltage (voltage at the point) of the capacitor 11b becomes almost zero, and this zero voltage is compared with the reference voltage obtained by dividing the resistors 29a and 29b by the comparator 12.
2 is turned off, and the terminal voltage of the capacitor 13b charged via the resistor 13a becomes the comparator 14.
This terminal voltage is input to voltage dividing resistors 26a, 2
When the voltage becomes larger than the reference voltage obtained by dividing the voltage by voltage 6b, the comparator 14 is turned on. At that time, if the gate G voltage of the programmable union transistor 16 (hereinafter referred to as PUT16) becomes equal to or less than the anode A voltage determined by the Zener voltage of the Zener diode 18, the PUT
16 is turned on, discharging capacitors 20, 1
9 is discharged through the set coil 17 of the latching relay, and first and second contacts 17a and 17b, which will be described later, are turned on. When the charge in capacitors 19 and 20 disappears, PUT16
returns to the off state and the PUT 16 turns on and off periodically, but if there is a power outage, the PUT 16 only changes sporadically from off to on. Therefore, different detection signals can be taken out from the gate G (point in the figure) of the PUT 16 at the time of phase loss and power outage. In addition, 15a and 15b are voltage dividing resistors, 3
0 and 31 are current limiting resistors, respectively, and 32 and 33 are diodes, respectively.

Next, the power failure/open phase indicating circuit of the present invention will be explained. A three-pole connector 6 is connected via a rectifier 41 and a current-limiting resistor 61 to the secondary side of a step-down transformer 40 whose primary input is any two wires 21a, 21b of three-phase AC.
2 is connected, and the storage battery 42 is connected to the step-down transformer 46 and the changeover switch 43 to be described later by the connector 62.
It can be freely connected to. If each pole of the connector 62 is now in a connected state, the storage battery 42 is in a charging state, and this charging voltage (that is, the positive electrode of the storage battery 42) is applied to the input terminal 43d of the changeover switch 43 such as the slide switch. be done. This changeover switch 43 has the open contact 43a and the display contact 4.
3b, a connecting contact 43c, and an input contact 43d, and furthermore, an input contact 43d and an open contact 43a.
, a second circuit that connects the input contact 43d and the display contact 43b, and a third circuit that connects the input contact 43d and the connection contact 43c. It is said to be switchable. Therefore, if this power outage/open phase display circuit is not used for a long period of time, by setting the changeover switch 43 to the first circuit, the storage battery 42 will not be consumed at all and its capacity can be maintained for a long period of time. Also, display contact 43
A load resistor 44 is connected to b, and this load resistor 4
The other end of 4 is grounded. On the other hand, load resistance 4
4 is connected in parallel with a series circuit of a resistor 45 and a yellow light emitting diode which is a display element 46 for displaying the charging state of the storage battery.
It is possible to check the state of charge of the storage battery 42 by flowing a large current from the storage battery 42 through the load resistor 44, and if the storage battery 42 has sufficient capacity, the yellow light emitting diode will light up, indicating that there is no abnormality in the storage battery 42. shows. Even when the storage battery 42 is being charged, if (current-limiting resistor 61≫load resistor 44) holds true, correct display can be expected.

When set to the third circuit of the changeover switch 43,
During normal operation, the charging voltage of the storage battery 42 is determined by a normality display circuit consisting of a series circuit of the NO type third contact 10a of the latching relay, a current limiting resistor 47, and a green light emitting diode which is a display element 48 for normal display confirmation. 49 to light up the green light emitting diode. This light-emitting diode turns off when the storage battery 42 is not connected properly, has a failure (shock), or is insufficiently charged, and lights up only when there is no power outage or open phase and is in normal operation. Show that something is true. Furthermore, connection contact 43
oscillation circuit 5 composed of two inverters
1, and the charging voltage of the storage battery 42 is also supplied to this oscillation circuit 51. The first contact 17a of the latching relay is turned on due to a phase loss or a power failure, and the two abnormality display elements 50 connected to the oscillation circuit 51 via the inverter circuit 52 and inverters 63 and 64 are turned on.
Red light emitting diodes a and 50b are lit alternately. Therefore, since the lighting of the display elements 50a and 50b moves, identification is easy even if the person is far away or the surroundings are bright. 65 is a current limiting resistor. The normality display circuit 49 includes a programmable union transistor 53 (hereinafter referred to as PUT 53), a second contact 17b of a latching relay, a ringing device such as a buzzer 54, and a switch element 55 composed of a transistor in series. The circuits are connected in parallel, and the base of the transistor is connected to the oscillation circuit 51 via a base resistor 66 and an inverter 63.
This transistor is turned on and off by the output of the oscillation circuit 51. and,
The gate G of PUT53 is connected to the
It is connected to the gate G (center point in the figure) of PUT16, and as mentioned above, this gate G voltage changes intermittently during a phase failure, and changes sporadically during a power outage. PUT during phase loss
If the bias resistor 68 is adjusted so that the gate G of PUT 53 obtains an "L" level detection signal, the gate G of PUT 53 will be lower than the anode A voltage during a phase outage, and PUT 53 will be turned on and the bias resistor 57 will be turned on. A voltage is applied to. If the second contact 17b is turned on before or after that, a voltage is applied to the buzzer 54. At this time, the buzzer 54 is activated by turning on and off the transistor using the oscillation circuit 51.
can be made to flicker.

Next, press the stop switch 56, such as a soft touch switch that can be driven externally, and shoot between the anode A and gate G of PUT53.
3 is turned off and the buzzer 54 stops. Here, when the phase is open, a detection signal is intermittently transmitted to the gate G of the PUT 53 via the bias resistor 68 at a constant cycle, so the buzzer 54 sounds again. On the other hand, in the event of a power outage, the detection signal is sporadic, so once the stop switch 56 is turned on and the PUT 53 is turned off, the buzzer 54 will not resume sounding, making it possible to differentiate between phase loss and power outage. In addition, 7
0 and 71 are a protective resistor and a capacitor, respectively, and 72 has one end connected to the storage battery 42 and the other end connected to the third,
This is a diode connected to the connection point between the fourth resistors 6 and 7 for setting a predetermined voltage.

Thus, in the present invention, the primary side is a step-down transformer connected to any two wires of three-phase alternating current, which constantly charges the storage battery, and connects the open contact and the input contact.
a second circuit connecting the circuit and the display contact and the input contact.
A third circuit that connects the circuit and the connection contact and the input contact.
A storage battery is connected to the input contact of a changeover switch having a circuit, a current-limiting resistor and a display element for displaying the charging state of the storage battery are connected in parallel to the display contact, and the first contact that turns on when normal and the display element for displaying the normal state are connected to the connection contact. Since the normal display circuit composed of a series circuit with the display element is connected and the above circuits can be switched freely, it is possible to display storage battery abnormalities such as failure of the storage battery, forgetting to install the storage battery, insufficient charging of the storage battery, etc. Moreover, the above-mentioned indication of insufficient charge of the storage battery can be performed even while the storage battery is being charged, which has the advantage of being convenient as there is no need to set up a special inspection process to detect abnormalities in the storage battery. An oscillation circuit that alternately lights up the two abnormality display display elements is connected to the connection contact through the first contact, so the two display elements will alternately light up in the event of a power outage or phase loss. It is easy to detect an abnormality even if the surroundings are bright or from a distance.Furthermore, the programmable unidirectional transistor, the second contact, the ringer, and the switch element turned on and off by the oscillation circuit are connected in series. Since it is connected in parallel to the normality display circuit and a low level detection signal is input to the gate of the programmable unidirectional transistor in the event of a power outage or phase loss, the programmable unidirectional transistor is Moreover, the switch element is periodically turned on and off by the oscillation circuit, so in the event of a power outage or phase loss, the display element lights up and a buzzer-like sounding device flickers to detect abnormalities. In addition, since a NO-type stop switch is inserted between the anode and gate of the programmable union transistor, turning on the stop switch during a power outage will cause the ringing device to start ringing. programmable unification in the event of a phase loss.
Since the detection signal is intermittently inputted to the gate of the transistor, the ringing of the ringing device cannot be stopped, so that it is possible to discriminate between open phase and power outage.

[Brief explanation of drawings]

The attached figure is a specific circuit diagram of an embodiment of the present invention, 17a, 17b, and 10a are first, second, and third contacts, respectively, 40 is a step-down transformer, 41 is a rectifier,
42 is a storage battery, 43 is a changeover switch, 43a, 4
3b, 43c, and 43d are respectively open contacts, display contacts, connection contacts, and input contacts; 44 is a load resistance; 45
46, 48, 50a, 50b are respective display elements, 47 is a current limiting resistor, 49 is a normal display circuit, 5
1 is an oscillation circuit, 52 is an inverter circuit, 53 is a programmable union transistor, A is an anode, K is a cathode, G is a gate,
54 is a buzzer, 55 is a switch element, 56 is a stop switch, 57 is a bias resistor, and 60 is a power failure/open phase detection circuit.

Claims (1)

[Scope of utility model registration request] It has first and second contacts that turn on when detecting a three-phase AC power outage and phase loss, and a third contact that turns on during normal operation. Equipped with a power outage/open phase detection circuit that generates an “L” level detection signal, a storage battery is connected in parallel via a rectifier to the secondary side of a step-down transformer whose primary input is any two wires of the three-phase AC. a first circuit that connects the input contact and the open contact, and a second circuit that connects the input contact and the display contact, and a second circuit that connects the input contact and the display contact; and a second circuit that connects the input contact and the display contact; The positive electrode of the storage battery is connected to the input contact of a changeover switch which has a third circuit connecting the contacts and each circuit can be switched freely, and the other end of the load resistor connected to the display contact is grounded to connect the resistor and the storage battery. A series circuit with a display element for displaying the state of charge was connected in parallel to the load resistor, and the connection contact of the changeover switch was configured with a series circuit of the third contact, a current-limiting resistor, and a display element for confirming normal display. A normal display circuit is connected, the other end of the normal display circuit is grounded, and an oscillation circuit such as an inverter oscillation circuit that alternately lights two display elements for displaying an abnormality is connected as described above through the first contact point. A programmable unification transistor connected to the contact, a series circuit consisting of the second contact, a ringing device such as a buzzer, and a switch element turned on and off by the oscillation circuit are connected in parallel to the normality display circuit, and a programmable・Between the anode and cathode of a unidirectional transistor
Inserting a NO-type stop switch and inserting a bias resistor between the cathode and ground, and inputting the detection signal generated by the power outage/open phase detection circuit to the gate of the programmable unidirectional transistor. A power outage/open phase display circuit that turns on a transistor.