JPS63202198A - Sending system for system start/stop signal - Google Patents

Abstract

PURPOSE:To prevent malfunction or destruction of memory content information of a load side by sending a start/stop signal after an output switch is turned on and a stable output voltage is supervised without sending the start/stop signal as soon as a power switch is applied in case of supplying power to an electronic exchange. CONSTITUTION:Applying a power switch 3, supervising circuits 5, 6 supervise an output voltage of aline feeding system and a central processing feeding system and when the output voltage reaches a stable region, a diode side of a photocoupler at a sequence circuit 2 is driven to make the transistor side of the photocoupler in a start/stop circuit 4 conductive. Thus, a system start/stop signal is sent to the load side. In case of applying the output switch by the monitor circuits 5, 6, since the rush current flowing time caused in a capacitive load is masked by throwing the output switch, the drooping state of the output to the central processing system is not caused regardless of the start signal being sent.

Description

[Detailed Description of the Invention] [Summary] In a power supply device that supplies line system voltage and central processing system voltage to an electronic exchange, when supplying power to the electronic exchange, a system start/stop signal is generated at the same time as the power switch is turned on. Instead, after monitoring the output switch ON and stability of the output voltage, a system start/stop signal is sent to the electronic exchange.

[Industrial application field]

The present invention relates to a power supply device that supplies line system voltage and central processing system voltage to an electronic exchange.In particular, when the electronic exchange is turned on, the line system voltage (-48V or -24V) and central processing system voltage (generally logic circuit Two or more types of DC voltages (+5V) are required.

A power supply device that supplies this type of DC voltage needs to notify the electronic switching system of the state of the output voltage supplied to the central processing system when the power is turned on.

[Conventional technology]

A conventional system start/stop signal system is shown in Fig. 3. In the figure, 1 indicates an A C/DC eliminator power supply as a power supply device, which includes a rectifier circuit section 11, a power conversion circuit section 12,
14, consisting of smoothing circuit parts 13 and 15, which inputs commercial power from the AC power supply 10, converts it to direct current by the rectifier circuit part 11, superimposes it on the oscillator in the power conversion circuit part and converts it into voltage, and from the smoothing circuit part 13 -24V is supplied to the line power supply system via the sequence circuit section 2. Further, +5V is supplied to the central processing system from the smoothing circuit section 15. Also Batt
is an auxiliary power source in case of AC power outage.

By turning on the output switch 3, the auxiliary contact 7 of the sequence circuit section 2 is opened, the diode side 8 of the photocoupler is energized, the transistor side 9 of the photocoupler of the system start/stop circuit 4 is conductive, and the system side is started. Ta. That is, in conjunction with turning on the switch 3, a system activation signal is immediately sent out. At this time, when the output switch 3 is turned on, a rush current flows due to the capacitive load on the load side, and the output voltage drops momentarily. This is due to the overcurrent caused by the above rush current when the output switch is turned on.
The overcurrent detection circuits (not shown) provided at 2 and 14 operate to control the duty ratio of the drive signal to be small, reduce the ON width of the transistor for oscillator O8, and lower the output voltage. This is to make it happen. When the current returns to normal, the duty ratio also returns to normal, and by repeating on and off, the voltage returns to normal.

For the above reasons, when an overcurrent rushes in, the output voltage +5V from the smoothing circuit section 15 also drops instantaneously. Therefore, even though the system side is activated, the output voltage of +5V is lowered, which causes malfunction of the electronic exchanger on the load side.

[Problem that the invention seeks to solve]

Therefore, in the present invention, a logic circuit such as a memory in the control system is required to prevent the load-side electronic exchange from malfunctioning even if the output voltage momentarily drops due to the rush current caused by the capacitive load on the load side when the output voltage is turned on. After the output voltage becomes stable, a system start/stop signal is sent to the load side.

[Means for solving problems]

FIG. 1 is a diagram showing the principle of the present invention.

In the figure, 1 is a power supply device, 2 is a sequence circuit, 3 is a power on switch, 4 is a start/stop circuit, 5 is a first output voltage monitoring circuit to the line system, and 6 is a second output voltage monitor circuit to the central processing system. The output voltage monitoring circuit is shown, and 5 and 6 are additional circuits of the present invention.

When the maintenance person turns on the power switch 3, the monitoring circuits 5 and 6
When the output voltage reaches a stable region, the diode side of the photocoupler in the sequence circuit 2 is driven, and the transistor side of the photocoupler in the start/stop circuit 4 becomes conductive. This allows the system to start
A stop signal is sent to the load side.

[Effect]

This monitoring circuit always masks the inrush current inflow time that occurs in the capacitive load when the output switch is turned on.
Even though the activation signal is being sent, the output voltage (+5 V) to the central processing system does not drop.

As for the operation within the monitoring circuit, a start signal is not sent out until the output voltage reaches a specified value, and when the output voltage reaches the specified value, the diode side of the photocoupler in the sequence circuit is energized and a start signal is sent out.

〔Example〕

An embodiment of the invention is shown in FIG. In the figure, 1 is AC
-DC eliminator power supply circuit, 2 is a sequence circuit, 3
is a power supply switch, 4 is a start/stop circuit, 5 is a first monitoring circuit (-24V monitoring circuit), and 6 is a second monitoring circuit (
+5v monitoring circuit), 7 is the switch auxiliary contact, 8 is the diode side of the photocoupler (light emitting side), 9 is the transistor side of the photocoupler (light receiving side), 10 is the AC power supply, 11 is the AC-
A rectifier circuit section of the DC eliminator power supply circuit, reference numerals 13 and 15 indicate a smoothing circuit section, and 12 and 14 indicate a power conversion circuit section.

Monitoring circuits 5 and 6 each include a transistor Ql for level monitoring.
and Q2, and operational amplifiers A1 and A2 for amplification.Until the output voltage reaches the specified value, operational amplifiers A1 and A
The output level of 2 is at H level, transistors Q1 and Q2 are in the on state, and the diode side 8 of the photocoupler
The base potential becomes L level and no activation signal is sent out. When the output voltage reaches the specified value, operational amplifiers Al and A2
The output level of moves from H level to L level, transistors Ql and Q2 are cut off, the diode side 8 of the photocoupler is energized, and the base potential of the diode driving transistor of the photocoupler moves from L level to H level. The transistor side 9 of the photocoupler becomes conductive. As a result, a start/stop signal is sent to the system side.

〔Effect of the invention〕

As described above, according to the present invention, by providing the output voltage monitoring circuit, it is possible to compensate for the sequence conditions of the output voltage and prevent the destruction of the memory content information or malfunction on the load side.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an embodiment of the present invention, and FIG. 3 is a diagram showing a conventional example. In the figure, 1 is a power supply device (AC-DC eliminator power supply circuit), 2 is a sequence circuit, 3 is a power supply switch, 4 is a start/stop circuit, and 5 is a first monitoring circuit (-24V
6 is a second monitoring circuit (+5V monitoring circuit),
7 is a switch auxiliary contact, 8 is a photocoupler side (light emitting side), 9 is a transistor side (light receiving side) of a photocoupler, IO is an AC power supply, 11 is a rectifier circuit section of an AC-DC eliminator power supply circuit, 13. 15 is a smoothing circuit section;
12 and 14 indicate power conversion circuit sections. Agent Patent Attorney Sada Igata − φ

Claims (1)

[Scope of Claims] In a power supply device that supplies line system voltage and central processing system voltage to an electronic exchange, an output signal is output to a start/stop circuit (4) that sends a system start/stop signal to the electronic exchange when the power is turned on. The first and second monitoring circuits (5) and (6) that monitor the output voltage are connected to the sequence circuit (2) that sends out the output voltage, and the output voltage supplied to the central processing system is stabilized when the power is turned on. After checking with the monitoring circuit, start/stop circuit (4
) is a system start/stop signal sending method characterized by sending a system start/stop signal to an electronic exchange.