JPH024090B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a latching relay drive circuit that simultaneously drives a large number of latching relays whose contact states are switched by short-time excitation.

FIG. 1 shows a conventional example of a latching relay drive circuit using a so-called remote control relay in which the contacts are reversed in response to the direction of energization to the relay coil and the state of the contacts is maintained after energization is stopped. Generally 1
When a large number of latching relays 1 are connected to a remote control transformer 5, each remote control transformer 5 has a current capacity limit. , or the number of latching relays 1 that can be turned off is limited, for example, to a maximum of 14 latching relays. Therefore, in the conventional example shown in FIG. 1, in series with each latching relay 1,
A remote control selector switch 6 is connected, which consists of a series-parallel circuit of diodes arranged in antiparallel and an on or off switch connected in series to each diode, and can be turned on or off all at once, and can be driven at once. A diode 7 is connected in series to each latching relay 1 by connecting an anode for batch ON and a cathode for batch OFF to the latching relays 1 that constitute a relay group for each number of relays. The cathodes or anodes of diodes 7 corresponding to the respective latching relays 1 are connected in common, and first to Nth on and off switches 8 and 9 are connected in series to these, respectively. Therefore, in the conventional example circuit shown in FIG.
When trying to turn on or off the latching relays 1 all at once, turn on or off switches 8 or 9 one after the other to avoid exceeding the current capacity of the remote control transformer 5. There was a problem in that it was necessary to manually turn on each device one by one, and that it was cumbersome to perform a batch operation.

The present invention has been provided in view of the above-mentioned points, and it is an object of the present invention to provide a latching relay drive circuit that can drive a latching relay with a simple operation without exceeding the power supply current capacity. This is the purpose.

An embodiment of the present invention will be described in detail below with reference to the drawings.
FIG. 2 shows a circuit according to an embodiment of the present invention, which is similar to the conventional example described above in that remote control relays are used as the latching relays 1, and a remote control selector switch 6 is connected in series to the latching relays 1. be. According to the present invention, one of the AC ends of the diode bridge 2 is further connected in series with the latching relay 1, and the other of these AC ends is connected to the latching relay 1 in series.
A relay that is connected in common to each diode bridge 2 corresponding to the latching relay 1 that constitutes the relay group as described above, has the same configuration as the remote control selector switch 6, and whose contacts are for on and off.
Current direction switching circuit 1 consisting of contacts R ₁ and R ₂
0 and the above common connection end is connected in series. Furthermore, a thyristor 3 is connected between the DC ends of the diode bridge 2 for each of the relay groups,
The base of the transistor 11 that controls the gate input of the thyristor 3 is controlled by each output terminal output of the inverter 12. That is, the thyristor 3 and the transistor 11 constitute a switch element, and in order to operate the thyristor 3, which is a unidirectional switch element, as a bidirectional switch element, a diode bridge 2 is used.
is used. 4 is a distribution circuit, which is composed of, for example, a counter with a decoder;
Q ₁ every time the clock is input to the clock input terminal C
The output level of each output terminal of _Q6 is set to be high level for a certain period of time, and the inverter 12 inverts the output of each output terminal of the distribution circuit 4 and inputs it to the base of the transistor 11.
Reference numeral 13 denotes a clock generation circuit which inputs a signal synchronized with the zero-cross point of the power supply voltage waveform to the first flip-flop 14, and divides this output by the second flip-flop 15, and outputs the Q output to the clock of the distribution circuit 4. It is set as input. 1
6 and 17 are switches for turning on and turning off all at once, and these switches 16 or 17
When turned on, the corresponding relay R ₁ or R ₂ is energized, the contact R ₁ or R ₂ (NO side) corresponding to each relay R ₁ or R ₂ is closed, and the distribution circuit 4 starts operating. At the same time, the current direction switching circuit 10 selectively controls batch on or batch off.

FIG. 3 shows a time chart of the circuit centering on the distribution circuit 4 of the embodiment circuit of FIG. 2. When the switch 16 or 17 is turned on as shown in FIG. is reset and starts its operation, and starts inputting the clock as shown in FIG. Therefore, the distribution circuit 4
Output signals as shown in d to i in the figure are generated at the outputs of Q ₁ , Q ₂ ...Q ₆ , respectively, and for example, signals as shown in j to l in the figure are generated in outputs 1 to 3 of the inverter 12. These j~l
This signal is input to the transistor 11, and each group of latching relays 1 is sequentially excited for a short period of time. FIG. 4 shows a time chart of the clock generation circuit 13. For a full-wave rectified waveform as shown in FIG. 4a, a signal as shown in FIG. 4B is input to the S input terminal of the first flip-flop 14. A signal as shown in c in the figure is obtained as the Q output of the second flip-flop which uses the Q output of the first flip-flop 14 as the C input.
The signal shown in FIG. 2c becomes the clock for the distribution circuit 4. Thus, such a clock generation circuit 1
By using 3, the trigger timing and time length of thyristor 3 will be synchronized with the commercial power frequency, and latching relay 1 will be reliably turned on or off when thyristor 3 becomes conductive. .

As described above, the present invention assigns a plurality of latching relays to one of a plurality of relay groups, connects the latching relays in each relay group in parallel, and energizes the relay coil for each relay group. A plurality of switch elements to be turned on and off are connected in series to each relay group, and a series circuit between each relay group and each switch element is connected to each relay group for step-down voltage through a current direction switching circuit that selects the direction of energization to each relay group. A distribution circuit is connected between both ends of the secondary winding of the remote control transformer to control each of the above switch elements to be turned on sequentially for a fixed period of time, and each relay group is energized sequentially for a fixed period of time. Therefore, by setting the number of latching relays belonging to each relay group to a value that does not exceed the current capacity of the remote control transformer even when energized at once, all latching relays can be operated at once. By sequentially energizing each relay group when turning on or off, there is an advantage that a number of latching relays exceeding the current capacity limit of the remote control transformer can be collectively controlled. In addition, we have a distribution circuit that sequentially turns on each switch element for a fixed period of time, so with just one operation, each switch element turns on in sequence, and the contacts of each latching relay are simultaneously turned on. It can be set to on or off automatically, which has the effect of simplifying the operation compared to the conventional configuration.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a conventional example, Fig. 2 is a circuit diagram of an embodiment of the present invention, Fig. 3 is a time chart of the distribution circuit portion of the above, and Fig. 4 is a time chart of the clock generation circuit portion of the same. 1 is a latching relay, 2 is a diode bridge, 3 is a thyristor, and 4 is a distribution circuit.

[Claims]

1 Installation of grid electrodes using a grid electrode frame with a split structure in which a large number of grid electrodes are arranged at predetermined intervals between a pair of connecting bands so as to be perpendicular to the longitudinal direction of the grid electrodes. In this method, when fixing this grid electrode frame to a glass substrate, a low melting point glass layer is formed corresponding to a position on the glass substrate where the grid electrode is to be fixed, and a low melting point glass layer is formed on each of the grid electrodes. A low-temperature curing heat-resistant adhesive is applied to each end portion facing the layer, a holding plate glass is placed on these heat-resistant adhesives, and then both end portions of each of the grid electrodes are held down by the holding plate glass. Each of the grid electrodes is fixed in advance with the adhesive, and then the adhesive is bonded to the low melting point glass layer on the glass substrate together with the holding plate glass, and the low melting point glass layer is thermoset, thereby forming each grid electrode. A method for attaching a grid electrode, characterized by fixing it on a glass substrate.