JPS58190232A - Power source instantaneous disconnection detector 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] 1) Technical Field of the Invention A power supply instantaneous power interruption detection circuit, particularly a key I-key device that receives alternating current as an input, detects an instantaneous alternating current power interruption state and detects (
(b) Relates to a power supply interruption detection circuit that notifies the cough device of the instantaneous interruption recovery state when recovery occurs.

2) Prior art and problems The conventional 011OIW4 disconnection detection circuit determines that the power has been momentarily interrupted when the AC input falls below a certain reference level.
When the AC input exceeds the reference level, the K11l disconnection recovery state is notified to the device. However, the circuit that presets the reference level to be detected and compares the reference level with the AC input to detect whether it is above or below the reference level generally has to be installed outside the power supply. There was a problem in that the circuit itself became extremely large and complex.

3) Object of the Invention The object of the present invention is to provide a small 4-noise converter that forms 9-noise waves in synchronization with AC input to the AC power source 11 of the device, thereby making it possible to create a compact device that can be installed inside the device. The purpose of this invention is to provide a simple power interruption detection circuit.

4) Structure of the Invention Therefore, according to the present invention, a device is provided between an AC power source and a device that receives the AC power source as input, and detects a momentary interruption of the chain AC power source and notifies the device of recovery from the instantaneous interruption. 11L# In the instantaneous power failure detection circuit, the number of pulses is connected to the power supply, and the pulse conversion unit that is connected to the power supply and generates a pulse wave in synchronization with the skeleton wave, and one period of the pulse wave synchronized with the alternating current wave. A retrigger type monostable pulse wave generator that generates a pulse wave that is longer and has a width shorter than one cycle, and generates a pulse wave that has enough S to notify the above device of recovery from a power interruption. The monostable multipigrator is connected in sequence, and the retrigger type monostable multipigrator detects the momentary interruption of the stain source and power recovery, and the monostable multipigrator is triggered by the pulse wave generated when the power is restored. A power supply instantaneous interruption detection circuit is provided in which a power supply instantaneous interruption recovery signal is sent out.

5) Embodiment of the Invention FIG. 1 is a block diagram of a power supply interruption detection circuit according to the present invention. The circuit shown in Figure 1 supplies the output of the father current input current #AC to the mother pulse converter 1 to generate a mother pulse wave synchronized with the AC waveform, and after this pulse wave is no longer generated, it remains constant. When the re-trigger type monostable multi-paddle igrator 2 stops oscillating after a period of time, an instantaneous power interruption is detected, and the I-Russ converter 1 generates a dulse wave again to convert the re-trigger type monostable multi-pig igrator. 2 oscillates again, and at the same time as that oscillation, it becomes monostable! Luchi pie! When the regulator 3 is triggered, an AC input instantaneous interruption recovery signal is sent out.

- The 4 pulse converter 1 includes a light emitting diode D1. D! and a phototransistor Tr1. which is connected in parallel to the drive power supply V corresponding to each diode. T
It has r2k. Since the light emitting diodes 01eDl are connected with opposite polarities, the AC input from the Il source AC passes through only one of DlsDl, and accordingly the corresponding phototransistor "r + e Tr2
conducts and supplies a 9 pulse wave synchronized with the AC input to the retrigger type monostable multipigrator 2.

Re) The IJ f-type monostable multipiler 2 is biased by the same DC power supply VK as the Dulse converter 1, and is triggered once by the /l pulse wave from the Dulse converter 1 and oscillates. When triggered, it has the function of extending the oscillation time of the pulse width w*i determined by the external C3 and R shown in FIG. 1 from this re-trigger input as the starting point. Therefore, the retrigger type monostable multipigrator 2 outputs a continuous wave at least while being supplied with a pulse wave from the converter l.

In this example, the retrigger type monostable! The output pulse width W of the lute pipe grator 2 is set by Cm e so that Tl<W<2T, where TI is the period of the pulse wave of the converter 1.
It is set by R1.

Monostable multipigrator 3 is a normal one, and is retrigger type main stable! The output of the multipilator 20 is reversed at the rise of the arm pulse wave, that is, the 4-way wave, and cs + I
It is designed to oscillate only for a certain period of time determined by LS.

Next, the operation of the circuit of FIG. 1 configured as described above will be explained with reference to the waveform diagram of FIG. 2.

When an AC wave input having a positive waveform shown in Fig. 11g2 (-) is supplied from the power supply module C to the base pulse converter 1 at time t1, it intersects with the negative part of Fig. 2 (,). Current is arrow α
The light flows in the direction of , turning on the light emitting diode p1 and turning off the light emitting diode D3. Therefore, when only the diode D1 emits light, the corresponding phototransistor Tr1 is exposed to light, and its base and emitter are forward biased, and the transistor Tr1 is turned on. The potential at point b is the DC power supply vKIfP when Trl is off, but when it is on, the current flowing through the resistor lowers the potential at point b, as shown in Figure 2 (b
), an A pulse wave P1 having a period T1 corresponding to the time when the AC input becomes negative is generated. Upon the rise of the first notarth wave Pl from the tortoise converter 1, the f-type monostable multipigrator 2 oscillates.

However, before Pigrator 2 falls, T
Because of the relationship 1<W, the AC input waveform ((1) in FIG. 2) becomes zero and the transistor Tr2 is turned off.・The second /# pulse wave PI with the same period TI as Pl is generated from the pulse converter 1 rises and is supplied to the vibrator 2, so the vibrator 2 sends out a continuous wave tube (Fig. 2 (@)).

When the AC input waveform becomes positive and *g flows in the direction of arrow β (Fig. 2 (b)), diode D is turned on, transistor Tr2 is turned on, and 1t flows through p resistor H.
A voltage drop occurs due to rIL, and the second pulse wave Pnt
(Fig. 2 (b)) e When the AC input becomes zero (Fig. 2 (a)), the third notarus wave P3 rises, and when it becomes negative, it falls. One pulse wave PI is generated.

During this time, for the same reason as mentioned above, the retrigger type monostable multipigrator 2Fi continuous wave is sent out (see Figure 2).
C)).

When the AC input is momentarily interrupted for a time τ1 (Fig. 2 (1))
, the potential at point b (Fig. 1) is equal to the potential of the DC power source V), and the output waveform of the pp-Russ converter l becomes a rectangular wave as shown by reference numeral P4 (Fig. 2 (b)). .

At the rising time t4 of the rectangular wave P4, the retrigger type stabilized vibrator 2 oscillates, but since the time W111 is longer than the output pulse width W, the vibrator 2Vi oscillates after the time W has passed from the time t4. Stop (Fig. 2(c)').

1. At time point 1, the instantaneous interruption of the AC input is recovered and 11tlL flows in the direction of arrow α, and the rectangular wave P4 falls, but at time point t @ trench, the notarus wave is not output from the notarus converter l (the (Fig. 2(b)) @However, when the AC input waveform becomes zero at t-, a Nollus wave PI is generated by the transformation s1, and a similar Dulse wave P is generated at the period TI (Fig. 2). (b)) @As long as the AC input is applied thereafter, the period TI's arm pulse 111 P @ + P-
...is formed by the Cajals transformation 111 and supplied to the retrigger monostable multivibrator 2, and the multivibrator 2 outputs a continuous wave in the same manner as the trigger operation by the Sars wave P1 + Pl + PIK described above (Fig. 2). (t
)), at the rising time t- of this continuous wave, the monostable multivibrator 3 is triggered and the circuit constant "M*
Outputs a pulse wave with a predetermined width determined by R1 (
Fig. 2(d)) @ That is, at a certain point, the instantaneous recovery is detected by the IJf type monostable multivibrator 2, and at the same time, the p momentary interruption recovery signal is generated by the monostable multivibrator 3. (Fig. 2 (e), (d)) @In addition, in the above-mentioned example, as shown in Fig. 2 (,), an instantaneous interruption occurs during the time τ1 during which the AC input is not applied to the pulse converter IK. However, it is also possible to create an instantaneous interruption state during the time τ1 when the AC input waveform is low, as shown in FIG. 3(1). In this case, a certain reference level is set for the AC input, and below that reference level, the phototransistor ``r1+Tr2'' is prevented from turning on when the reference level is below the reference level. ) generates a rectangular wave P4, and operates in the same manner as in the case of vibrators 2 and 3Fi in FIG.

6) Effects of the Invention According to the present invention, by providing a pulse converter that generates a nine-wave pulse wave in synchronization with an AC input, the AC input is momentarily interrupted while the square wave is not generated. Since it is possible to send an instantaneous interruption recovery signal when it is determined that the main pulse wave is generated, a small and simple one-source instantaneous interruption detection circuit that can be installed inside the AC power input side of the device is provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the instantaneous power interruption detection circuit according to the present invention #4, and FIGS. 2 and 3 are waveform diagrams of various parts of the circuit shown in FIG. 1. 1. Ridalus converter, 2. Retry type monostable multivibrator, 3. Monostable multivibrator. Patent Applicant: Fujitsu Limited Patent Attorney Akira Aoki Patent Attorney Kazuyuki Nishidate 1) Yukio Patent Attorney Akira Yamaguchi Figure 1 →-■ Figure 2, 6, “ Figure 3 (d)

Claims (1)

[Claims] Provided between an AC power source and a device that receives an AC power source as input,
In the instantaneous power interruption detection circuit that detects the instantaneous interruption of the AC power supply and notifies the above device of recovery from the instantaneous interruption, a power interruption detection circuit that is connected to the AC source and synchronizes with the AC wave to generate a nine-wave pulse wave. The converter is synchronized with the alternating current wave, has a width longer than one period and shorter than one period of the mother pulse wave, and generates a pulse wave.
IJ f-type monostable multipigrator, with enough width to notify the above device of recovery from power interruption! Monostable multipigulators that generate medium pulse waves are connected in sequence, and the above-mentioned retrigger type monostable multipigrator detects power interruption and power recovery. A power interruption detection circuit that triggers the grater to send out a power interruption recovery signal.