JPS59153471A - Output voltage variation preventing device for inverter power source - Google Patents

Abstract

PURPOSE:To stabilize the output with a simple circuit configuration by bringing the output phase of a frequency divider which produces an output to an inverter in coincidence with that of a commercial power source. CONSTITUTION:The output of an oscillator having a crystal vibrator 15 and NOT gates 16, 17, etc. is frequency-divided by a frequency divider 19, and fed through a NOT circuit 28 to an inverter. The output of the divider 19 and the output of a commercial power source 11 are phase-detected by an AND gate 23, and a transistor 24 is controlled ON or OFF by the output. When the phases of the outputs of the power source 11 and the divider 19 coincide, a reset pulse is applied to the divider 19, which always produces an output waveform synchronized with the power source 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an output voltage fluctuation prevention device for an impark power supply device, which operates an impark section in synchronization with a commercial power supply,
The purpose is to prevent changes 11j in the output voltage.

Figure 1 shows a conventional impark power supply device, where 11) is an AC power supply, +21 to +31 are transformers, (4) is a rectifier circuit, (5) is a coil, (6) is a capacitor, (7) is a battery, (8) is a changeover switch, (9) is an impark section, and (1o) is its oscillation circuit. Usually commercial power supply fi
+ operates the impark section (9) via the transformer (2) and supplies power to the load. In an emergency (power outage), the sword switch (8) switches to the battery (7), and the oscillation circuit (1) oscillates at the same frequency as the commercial power supply t11.
0), the inverter section (9) is operated to continue supplying power to the load.

However, if the frequency of commercial power supply +11 and the oscillation frequency of impark #i9+ differ slightly, the impark section (9) operates at the peaks and troughs of the ripple after smoothing of the commercial power supply (1), so the output A phenomenon in which the voltage fluctuates appears.

That is, as shown in Fig. 2, there is a difference between the input current waveforms KA' and B' between the case where the impark section (9) operates at point A of the impark input voltage and the case where it operates at point 8 of the impark input voltage. occurs, leading to fluctuations in the output voltage. This is because even if the oscillation frequency of the temporary λ impark section (9) is fixed17, the frequency of the commercial power supply il+ may shift, so as a measure to completely prevent rain, the impark section (9) is ), it is best to make the operating power supply completely direct current, that is, to make it completely rectified and smoothed from the commercial power supply (1), or to provide a direct current power supply.
This is uneconomical as the circuit configuration becomes complicated.

The present invention solves these conventional problems, and its characteristics are that the commercial power supply is fully rectified and smoothed, the inverter section is fully operated, and in an emergency, the battery VC is switched to supply power to the load. In the Guhiinberg power supply system, a frequency divider divides the original oscillation to obtain the same frequency as the commercial power supply and supplies it to the impark section, and a phase detector detects the phase between the commercial power supply and the output of the divider. The circuit is the runner-up, as it includes a reset pulse forming circuit that outputs a reset pulse to the divider to reset it when the commercial power supply and the output of the divider are in phase.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment.
The figure is a circuit diagram showing one embodiment of the present invention, and each part a
-h waveforms are shown in Figure 4 a-hvC dogs.

In Fig. 6, a 60 Hz commercial power source (1) is full-wave rectified by a transformer (via a rectifier circuit θ3), and a transistor (14) converts the frequency 12, which is twice the frequency of the commercial power source (11).
Create a rectangular wave a1 (0Hz). On the other hand, a crystal oscillator (15j
An oscillation circuit (1
8) When obtaining 60Hz, use Kero 932T6MHz,
To obtain 50Hz, use 3.2768MHz and 3MHz
Perform z-order primary oscillation, and use fL as a branching device (19).
Divide the frequency by 15 to obtain an output twice the desired frequency. The drive circuit of the impark section uses a two-phase split circuit using a flip 70 tube and a NAND gate, so
It may be twice the target frequency. (20) t211 is D
With the type frig 70, the rectangular wave a obtained from the commercial power supply (11) is sent to the D terminal of the 7 rip 70 plug (20), and the output of the oscillation circuit is connected to the CK of the 7 rip 70 plug (20+ +2]1).
While inputting to the respective terminals, the Q output of the flip 70 knob (20) is input to the D terminal of the 70 flip 70 knob t211.
, by sending the Q output together with the vCNAND gate 2,
In synchronization with the rise of the square wave a from the commercial power supply (11),
Create a reset pulse fk with a width equal to the period of the original oscillation. Phase detection is performed by taking the AND condition of the rectangle ia obtained from the commercial power supply (11) and the output of the branching unit (19) using an AND gate. Then, on the right side (R
If there is a 180° phase difference between the two, as in the case of Tensui), then it is considered that they are synchronized, and if there is a VC as shown by the L arrow, the output C of the ANDNO gate will have a period of level ■ ( , the transistor (24) is turned on, the capacitor (2f51f) is discharged, and the transistor (2G) U is in the off state -it, so the output g of the NOR gate 1271 is always at the L level, and the reset pulse f is outputted. First, the output (120Hz) obtained by dividing the original oscillation is NOT
The first signal is outputted through the gate 281 and sent to the impark section. If synchronization is assumed, the output of the ANDNO gate will be at level 17 as shown by the R arrow in Figure 4, the capacitor □□□ will be fully charged, and the pace current of the transistor will flow, so the transistor f2
61f”j is turned on and NAND is applied to the NOR gate by η
The reset pulse f from t2Z is applied to the frequency divider (I9
) to the R3 terminal of the commercial power supply (11) every cycle.
An output waveform with twice the frequency can be obtained in synchronization with . The output waveform is phase-detected again by the ANDNO gate, the reset pulse f is turned on and off, and feedback control is applied to obtain an output waveform that is always synchronized with the commercial power supply CII).

In an emergency (during a power outage), the reset pulse f that was output in synchronization with the commercial power supply (11) disappears, and the original oscillation is split and output as it is, so a continuous and stable output waveform can be obtained. . When the commercial power supply (11) is turned on again, the phase matches the output of the branching unit (19).

That is, the output waveform by the original oscillation continues until zn, and once they match, an output waveform synchronized with the commercial power supply (11) is sent out by the reset pulse f according to normal operation. Specifically, commercial frequency 60.5 R2, original oscillation branch output 6
0Hz, the difference [ ], 5Hz, that is, 2se
The phase is synchronized once in the cycle c, but since the processing (phase detection) is actually twice the commercial frequency, the maximum time I S
Be sure to synchronize with the commercial frequency within EC.

Also, while synchronized at 1, it follows the original oscillation.

According to the present invention, the operation of the impark section can be reliably synchronized with the commercial power supply, and a reset pulse is not output in an emergency, and the operation is always performed using the frequency divided from the original oscillation. The control signal can be sent to the impark section without interruption. Furthermore, when the power is restored, the oscillation continues as long as the phase with the commercial power supply matches, and once the phase matches, the normal operation can be continued in synchronization with the commercial power supply.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional example, FIG. 2 is a waveform diagram thereof, FIG. 6 is a circuit diagram showing an embodiment of the present invention, and FIG. 1 is a waveform diagram thereof. [1...Commercial power supply, (18)...Oscillation circuit, (19)
... Frequency divider, (20) t211 ... D type 7 rig 7
0g, )...AND gate (phase detection circuit). Patent Applicant Ikeda Electric Co., Ltd. Agent Patent Attorney Yasu 1) Toshio! beast! :W:1
Fig. 1 Fig. 3 Fig. 5 Fig. 2 Fig. 4 1 L---i---R ,, rT71-1 Place -ITTI -, -, Mouth, -
, --8----Nini----Lord--------
-,l-,,,,-,,-,,,,,1,,-,-,
l -,, 1-7-------g------
−−−−−−−−−−−−−−−−−−−−−−−7−
−−−−−−h]−−−Knee “Knee, −,, −[T
l , -, -2 Tl -, -, -, - Procedural amendment (voluntary) April 16, 1980] ・Indication of If'l 1982 Patent request' + 28142 ke 2 Name of invention Inverter @ source device output fluctuation prevention device 3'f city 1
[Ruru-1 1.Relationship with f'l Patent applicant Ike〆 Denki Ikeda's machine bed type company, 1st generation ■ Koto The 577 -j Ru0

Claims (1)

[Claims] l In the impark power supply system @, which rectifies and smoothes the commercial power supply to operate the impark section and switches to the battery in an emergency to supply power to the load, the original oscillation is divided to produce the same frequency as the commercial power supply. A phase detection circuit detects the phase between the commercial power supply and the output of the divider, and a reset pulse is sent to the divider when the phase of the commercial power supply and the output of the divider match. An output type pressure change "I prevention device" for an impark power supply device, characterized in that it is equipped with a reset pulse forming circuit that outputs and resets.