JPS59194622A - Power source instantaneous detecting circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention detects when the output voltage of a power supply drops for a very short period of time. This invention relates to a power supply interruption detection circuit.

The form of supplying power to the conventional 'Tlt computer system is as follows:
It has become common for each system to have its own power supply equipment for multiple systems;
Currently, power is supplied directly from commercial power.

One of the major problems faced by adopting this type of power supply is that even if a failure occurs on the power supply side and the power supply stops, with a commercial power source, it is difficult to supply stable power to the load side. For this purpose, when a failure occurs, the power supply is switched to another power supply source, but the power supply is momentarily cut off due to the time delay K in this switching operation.

When a momentary power interruption occurs in a computer system, a drop in the output voltage of a DC power supply for a processing circuit that constitutes the computer occurs, that is, a momentary interruption of the output of the DC power source occurs. This lt4 disconnection may lead to a serious system failure depending on the instantaneous interruption time or the amount of output voltage drop. Therefore, it is necessary to perform processing such as restarting the computer system, which includes means for monitoring and detecting the presence or absence of a momentary power outage. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a power interruption detection circuit that detects when the output voltage of a power supply device drops for an extremely short period of time.

According to the present invention, a t# on/off state detection circuit, a current charging/discharging circuit, a magnetic memory relay, and a contact signal of the magnetic memory relay are capable of memorizing the contact open/close state when the power is turned on, even when the power is turned off. A power supply instantaneous interruption detection circuit including a sending means is obtained.

The present invention will be explained with reference to the drawings. FIG. 1 is a diagram showing a specific embodiment of the instantaneous power interruption detection circuit according to the present invention, and FIG.
The figure is a time chart for explaining the operation of the circuit. In FIG. 1, the monitored power supply E is input between terminals 11 and 12. The terminal 11 side is at ten potentials. Terminal 11
．． 12, a power on/off state detection circuit consisting of a relay IL L1, a charging circuit consisting of a diode D11 and a capacitor C, a diode D2 connected to the connection point of the diode D1 and the capacitor C, and a relay R1, 2 and relay RLI contact r7 and resistor R
1 are connected in series, and a circuit is connected to a circuit in which a resistor R2 and a relay FLL5 are connected in series.

Furthermore, the instantaneous power interruption detection circuit of the present invention has an additional circuit for controlling the relays R1, . . . , which is composed of a diode D3 and a resistor R9.

Terminals 21 and 22 are terminals for transmitting power interruption information and are connected to contacts r72 of relays R and L2.

ζ The operation of magnetic memory relays RL2, Rf, and 3 will now be explained. In FIG. 1, when a current flows from terminal a toward terminal a, relay RL2 becomes active and at the same time relay 'fLL3 becomes inactive.

As long as no current flows from the terminal to the terminal b', these conditions are reversed.

Next, the operation of the instantaneous power interruption detection circuit according to the present invention will be explained with reference to FIG. The figure is a time chart showing the circuit operation in each state in which the monitored power source E (hereinafter referred to as E) is turned off, turned on, and a momentary interruption occurs when turned on. In E, a low level solid line indicates a disconnected state, a high level indicates a closed state, and a dotted line indicates a momentary disconnection state. When terminal 13 is brought to ground potential and E is turned on at time t, relay RLL is turned on.
The contact rll that is active is opened. At the same time, a current flows to the capacitor C via the diode Di, and the potential e increases. The potential increases with a time constant determined by the circuit.

When an instantaneous interruption occurs at E between times ta and tb, as shown by the dotted line, relays R and 14 become inactive as shown by the dotted line, and when contact r11 is closed, relays R and L2 are transmitted from capacitor C. In the evening, current flows through diode D2 and drives relay L2, resulting in RL2 becoming active. Contact RL2 of 9.1 ftL2 is closed and transmits a power failure condition signal via terminals 21.22. It is sent as shown by the dotted line at rI12 in FIG.

As described above, since relays RLI and Rb2 are magnetic memory type relays, even if E is cut off at time t2, the closed state of contact rl12 is maintained as shown by the dotted line. When E is turned on at time t, the circuit operates as described above at time 1. The operation is the same as that in the closed state of E, but the closed state of contact r12 is maintained. The release of this closed state is time-based. This is done by removing the potential of the terminal 13 from the ground and increasing the potential. That is, in FIG. 1, from E to resistor R2 diode D3
The current flowing to the ground through
; diode D3 is turned off, and the current supplied from E flows through resistor R4, and relay RL3 is driven and becomes active. The momentary stain source interruption state is released.

As explained above, according to the present invention, a circuit is provided which has a circuit for detecting abnormal power supply/disconnection status, a current charging/discharging circuit, a magnetic memory type relay, and a means capable of transmitting contact signals of the magnetic memory type relay. By adopting this configuration, it is possible to obtain a simple and inexpensive power interruption detection circuit that maintains the entire power-off state even in a power-off state and can send out a power-off state signal. 0

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the configuration of the instantaneous power interruption configuration circuit according to the present invention, and FIG. 2 is a time chart for explaining the operation of the circuit ' shown in FIG. M1. In Fig. 1, il, 12.13, 21.22... terminal RIJ
, IIL2. Ordinary L3・・・・・・・・・Relay 1
)i, D2. i) β・・・・・・・・・・・・・・・
・・・・・・Gui, Ode C・・・－・・・・・・・・・
・－・・・・・・・・・・・・Capacitor correction, R2
・・・・・・・・・・・・・・・・・・・・・・・・
Resistance r7L, ri2・・・・・・・・・・・・・・・
・・・・・・Contact E・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・Monitored power source・・・・・・
・・・・・・・・・・・・・・・・・・・・・ Capacitor terminal voltage a, aXb, b ・・・・・・・・・
...Relay RL2. RLJ terminals in Figure 2: 1, 1213, t, 1. tb, tc ------- timings are shown respectively. 11th Patent Attorney Susumu Naika 3

Claims (1)

[Claims] It is equipped with a power on/off state detection circuit, a current charging/discharging circuit, a magnetic memory type relay that can memorize the contact open/close state in the power on state even when the power is turned off, and means for sending a contact signal of the magnetic memory type relay. A power supply interruption detection circuit characterized by: