JPH0619401B2 - How to check the operation of the solenoid for optical switches - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is intended to improve the accuracy of means for confirming the reliability of an optical switch used in an optical fiber communication line network. It measures and monitors the electrical characteristics of the optical switch solenoid in use.

[Conventional technology]

An optical switch used in an optical fiber communication line network has two solenoids, a fitting pin pulling solenoid and a switching solenoid.

This optical switch is built into the working core wire, but the installation location may be under hot and humid environmental conditions, and it will be necessary to operate the optical switch 10 years or more after the installation. Therefore, it is important to confirm the operation of the solenoid before operating the optical switch.

[Problems to be Solved by the Invention]

As mentioned above, the optical switch is continuously used by being incorporated in the working core wire, but it is often after a long time since the installation that the optical switch actually needs to be operated, and The operating time is also very short. If it is operated continuously, aging deterioration can be determined by a tester or the like using an optical pulse, but it is difficult to confirm the reliability of the optical switch because of the above-mentioned usage conditions. Further, when it becomes necessary to operate the optical switch, it is necessary to simultaneously operate the two solenoids so that the optical switch is switched within a short time of 20 ms in a state where the optical switch is incorporated in the working core wire, which has a large communication capacity. This is a condition that an optical switch used for an optical fiber communication line should have.

In order to solve the above problems, the present invention measures the electrical characteristics of a solenoid by supplying a small current from the low-voltage DC power supply to the solenoid so that the solenoid does not operate, and confirms its normal operation. It is an object of the present invention to provide a method for confirming the operation of a solenoid for an optical switch, which is also provided with a means for activating the solenoid by the discharge current of a capacitor charged by a high voltage DC power supply when the switch needs to be activated.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention includes a low voltage DC power supply 1 and a high voltage DC power supply 2, and a switch 3 is provided at a ground side terminal.
An optical switch solenoid provided with is excited by the low voltage DC power supply 1 via a diode, a voltage applied to the optical switch solenoid and a reference voltage are input to a comparison circuit, and an output signal thereof is sent to a CPU. To measure the electrical characteristics of the optical switch solenoid, and when it is necessary to operate the optical switch solenoid, an output signal from the CPU is provided for the ground side terminal of the optical switch solenoid. The switch 3 is turned off, the switch 4 provided between the power source side terminal of the optical switch solenoid and the positive side terminal of the capacitor connected to the high-voltage DC power source 2 is turned on, and the optical switch solenoid is further turned on. By turning on the transistor connected to the ground side terminal of the It is an operation confirmation method of a solenoid for an optical switch with a means for actuating the solenoid for an optical switch by the discharge of the capacitor being charged Te.

[Action]

A low-voltage DC power supply that supplies a minute current that does not activate the solenoid is applied to the solenoid, the solenoid applied voltage is compared with a preset reference voltage in a comparison circuit, and the result is output to the CPU.

The capacitor is charged by the high voltage DC power supply, and C
The transistor is turned on by the output signal from PU to discharge.

The discharge current allows the solenoid to operate only once, but the solenoid is not operated only by the current supplied from the high-voltage DC power supply.

〔Example〕

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

FIG. 1 shows a specific circuit of a method for confirming the operation of a solenoid for an optical switch according to the present invention, which is a circuit for measuring the electrical characteristics of the solenoid and a circuit for operating the solenoid for switching the optical switch. It is composed by.

In order to measure the electrical characteristics of the solenoid 6, it is essential that a minute current that does not activate the solenoid 6 be passed through the solenoid 6, and a low voltage DC power supply 1 (5 V in this embodiment) equipped with a resistor 13 and a diode 14 is required. ) Applies a low voltage to the solenoid 6 via the diode 11.

Since the ground side terminal of the solenoid 6 is grounded via the switch 3, this solenoid applied voltage is input to the negative terminal of the comparison circuit 7 via the resistor 12.

Since the reference voltage is set in advance by the variable resistor 5 and this reference voltage is given to the plus terminal of the comparison circuit 7, the output signal of the comparison circuit 7 is "L" when the solenoid applied voltage is lower than the reference voltage. Is input to the CPU 8. That is, it indicates that the solenoid is normal.

If the solenoid resistance increases for some reason, the voltage applied to the solenoid becomes higher than the reference voltage, so that the output signal of the comparison circuit 7 becomes "H", and the CPU 8 can detect the abnormality of the solenoid 6 by receiving this signal.

When operating the solenoid 6 to switch the optical switch, the solenoid 6 is activated by an output signal from the CPU 8.
Turn off the grounding switch 3 from ON to the solenoid 6
Switch 4 provided between the power supply side terminal of the capacitor and the positive side terminal of the capacitor 10 connected to the high voltage DC power supply 2
Is switched from OFF to ON.

As a result, C is applied to the gate terminal of the transistor 9 (FET).
The transistor 9 is turned on by applying a voltage from the PU 8.

The capacitor 10 is charged by a high voltage DC power supply (24 V in this embodiment) via a resistor 15 and a diode 16, but is turned on by a transistor 9 to discharge through a circuit constituted by a switch 4, a solenoid 6 and a transistor 9. . The capacitor 1
It is assumed that the capacity of 0 has a discharge current sufficient to surely operate the solenoid 6 once, but the resistance value of the resistor 15 is large so that the solenoid 6 is not operated by the current from the high voltage DC power supply 2. To do.

The resistors, diodes, switches, transistors, comparison circuits, capacitors, variable resistors and C that make up the circuits described above.
The PU is a general-purpose product that can be easily procured, and it is possible to combine the means for measuring the electrical characteristics of the solenoid and the means for operating the solenoid with a compact circuit configuration.

〔The invention's effect〕

As described above, the method for confirming the operation of the solenoid for an optical switch according to the present invention is a circuit for comparing a voltage applied to the solenoid with a preset reference voltage by supplying a minute current that does not activate the solenoid from a low voltage power source. It is possible to measure the electrical characteristics of the solenoid at all times because it is based on the comparison by the above, and when it is necessary to switch the optical switch, the electrical characteristics of the solenoid can be reconfirmed before switching. Therefore, even when the optical switch incorporated in the optical fiber communication line network is installed and switched over a long period of time, it can be implemented with sufficient reliability.

Further, since a signal for operating the solenoid in a short time by the discharge current of the capacitor charged by the high voltage DC power source can be output from the CPU for measuring the electrical characteristics of the solenoid, the circuit for performing the above-mentioned two means can be provided. It can be made compact.

Moreover, since all the circuit components may be general-purpose products, low cost and highly reliable ones can be used.

That is, the method for confirming the operation of the optical fiber solenoid according to the present invention is a method which is excellent in economy and reliability.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a method for confirming the operation of an optical switch solenoid according to an embodiment of the present invention. 1 ... Low-voltage DC power supply, 2 ... High-voltage DC power supply, 3, 4 ... Switch, 5 ... Variable resistance, 6 ... Solenoid, 7 ... Comparison circuit, 8 ... Micro computer, 9 ... Transistor, 10 ... Capacitor.

Claims (1)

[Claims] 1. An optical switch solenoid having a low-voltage DC power supply (1) and a high-voltage DC power supply (2) respectively supplied through a resistor and a diode, and a switch (3) at a ground side terminal, through the diode. Output from the comparator circuit that is excited by the low-voltage DC power source (1), inputs the voltage applied to the optical switch solenoid to the negative terminal via the resistor, and inputs the reference voltage preset by the variable resistor to the positive terminal. A means for measuring the electrical characteristics of the optical switch solenoid by sending a signal to the CPU, and a grounding side of the optical switch solenoid in response to an output signal from the CPU when operating the optical switch solenoid. The switch (3) provided on the terminal is turned off and the power supply side terminal of the optical switch solenoid and the high voltage By turning on the switch (4) provided between the positive side terminals of the capacitor connected to the piezoelectric power source (2), and further turning on the transistor connected to the ground side terminal of the optical switch solenoid. Means for discharging the capacitor charged by the high-voltage DC power supply (2) through the optical switch solenoid and the transistor, and activating the optical switch solenoid by the discharge current. How to check the operation of the solenoid for the optical switch.