JPS59153470A - Output voltage variation preventing device for inverter power source - Google Patents

Abstract

PURPOSE:To effectively prevent the variation in the output power source when power is supplied to a load by switching to a battery in emergency by providing a period circuit which operates an inverter in synchronization with a commercial power source. CONSTITUTION:A commercial power source 1 is connected through a transformer 2, a rectifier 4, a coil 5, and a changeover switch 8 to an inverter 9, and the output of the inverter 9 is supplied through a transformer 3 to a load. A period circuit 20 which operates the inverter 9 in synchronization with the power source 1 is provided, a battery 7 is switched in emergency to supply the power to the load. In this case, the oscillating frequency of the inverter 9 is allowed to coincide with the frequency of the power source 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an IF device for preventing output voltage fluctuations of an impark power supply device, and is capable of preventing changes in output voltage with a simple configuration.

Figure 1 shows the entire impark power supply system for produced rice, +11 is AC power supply, +21 +31 is transformer, (4) is rectifier circuit, (5) is coil, +61/f, capacitor, +71
1-j battery - (8) is a changeover switch, (9) is an impark section, ]]0) is its oscillation circuit. Normally, the commercial power supply 11) is fully rectified through the transformer (2) and the rectifier circuit (4), smoothed by a smoothing circuit consisting of a coil (5) and a capacitor (6), and then the changeover switch (8) is fully operated. to operate the impark section (9) and fully supply power to the load. In an emergency (during a power outage), the changeover switch (8) will switch to the battery (
7), the oscillation circuit (]0) which oscillates at the same frequency as the commercial power supply fi+ causes the impark section (9) to fully operate, and continues to supply power to the load through L7.

If the frequency of the commercial power supply 11) and the oscillation frequency of the impark section (9) are slightly different from each other, the impark section (9) operates at peaks and valleys of ripples after smoothing the commercial power supply fi+. Therefore, the phenomenon that the output voltage fluctuates appears.

In other words, as shown in Figure 2, when the Vc inverter input voltage mermaid impark section (9) operates and when it operates at point B, a difference occurs in the input current waveforms as shown in A'' and Bo. , which leads to fluctuations in the output voltage.This is because even if the oscillation frequency of the impark section (9) is fixed, the frequency of the commercial power supply [11] may shift, and the output voltage will be output at the frequency of the difference. There is a problem if the voltage fluctuates.

As a countermeasure to completely prevent this, the invert part (9
), the operating power supply is completely direct current, i.e., commercial power supply to
Perfect rectification and smoothing from DC power supply? Although it is best to provide the same, it is uneconomical as the circuit configuration becomes complicated.

The present invention 1.1 solves all of these conventional problems, and its characteristics are that the commercial power supply is fully rectified, smoothed and operated at full impark, and in an emergency it can be switched to the battery to handle the load. In an impark power supply that supplies all power to the impark section, is the impark section synchronized with the commercial power supply? The point is that a periodic circuit for operation is provided.

Hereinafter, if the present invention is explained according to the fully illustrated embodiments, the sixth
In the figure, +II] is an oscillation circuit, which is a 693216MHz oscillator (crystal oscillation') (12+
And frequency deposit! /23 frequency divider 03), a D-type flip 70 tube (14+051), and an AND gate (
16), an OR gate (1η), and a frequency divider (18) that divides the frequency into 2/212.
) is a periodic circuit, as shown in Fig. 4, which includes a diode bridge 1211, a smoothing circuit (2z, a phase detection full line slope with an amplifier), a comparator circuit 24), a Zener diode, and a voltage frequency conversion circuit. 127128+ and D type 7
Lip 70 knob 1291 list and AND gate 1311'
321, OR gate 1331, and NAND gate (3
41135] 1313] and NOT game) 4971
Fun short multi-by break (381
, a battery (39), and a comparison circuit section.

Next, the entire operation will be explained. The output (6, 96) of the oscillator (12)
216MHz) f frequency divider 03) to 3'23 (491
, 52KH2), D-type 7 rip 70g (I slope (15) and AND gate (10) create a narrow pulse signal that has the output frequency of the divider 0, and OR this pulse signal. Further (C/
The frequency is divided into 212 and the impark section (9) is operated.
07 operation signal S is obtained.

Phase detection circuit c) Compares the phase of the power output R of the commercial power supply il+ and the output waveform of the branching unit (+81).Power output R
When the phase of the operation signal S is more advanced, the phase difference portion becomes H level in the phase detection circuit 123), and the signal is integrated through all internal amplifiers to obtain one DC voltage. The output voltage is VC
Cut everything below V2 of C, and install a voltage-frequency conversion circuit (27
Enter 1. The free lag flop '2911 (equipment) 1 and the AND game) '311 output a narrow pulse at a frequency corresponding to the voltage. In addition, when the phase of the power supply output R is ahead (in other words, after the comparator circuit (241) performs all DC inversion amplification, the Zener diode (26) cuts the output voltage VCC below 'A?', and the voltage-frequency Conversion circuit '281 i'c addition - its output All multi-pipe rake (outputs with constant pulse width at 3~.OR gate α power is the logical sum of the output signals from AND gate (1G) and OR gate 133) The output frequency of the AND gate (16) is controlled in the direction of subtraction or addition according to the phase difference.Therefore, a signal synchronized with the commercial power source fil is always obtained as the operation signal S.

During a power outage, the output voltage level taken from the commercial power supply (1) by the comparator circuit (40) is the reference voltage Vre of the battery (39).
When it becomes less than f, all power outages are detected, and at this time, the comparison circuit (
The output of 401 becomes I, level, AND gate '3Z
The output of the oscillator (12) is set to kL, and the operating output S of the oscillator (12), which is completely frequency-divided, is outputted.

When the output of the comparator circuit (40) returns to 1, the output of the comparator circuit (40) becomes H and all phase detection is performed again, and all control of the operating signal S is performed. Zener diode (25) +
26! ' must be selected.

According to the present invention, since the periodic circuit FIII is provided in which the impark section is fully operated in synchronization with the commercial power supply, when switching to the battery in an emergency to supply power to the load, the oscillation frequency of the impark section is applied to the commercial power supply. It is possible to reliably prevent fluctuations in the output power by matching the frequency of the output power. Furthermore, there is no need to complete rectification and smoothing from a commercial power supply or to install a DC power supply in all stages, and the circuit configuration is simple, making it extremely economical.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a conventional example, Fig. 2 is a waveform diagram for explaining the operation of the conventional example, and Fig. 6 is an embodiment of the present invention. The circuit diagram shown in FIG. 4 is a circuit diagram of the same main part. fil...Commercial power supply, (9)...Impark section, ri0
)...Synchronous circuit. Procedural amendment (self-motivated) April 1981, 120 1 ・I'f71 indication 1982 [Patent Application No. 28+U] 2 issued
Name: Inverter power supply device output voltage change IgIj prevention device 3U
liif:46zui) 1 river with Xi'l, f.
111111 notification no l l visit (1'ili iE<a
<7) l l (t)
fu erasure 7, amendment answer fil The scope of claims of the F3A specification is revised as per the attached sheet. (2) Details latent f! ; Change “problem” on page 2, line 19 to “
"That's a problem," he corrected. (3) Page 3, line 10, page 3, line 18 and 6
On the 8th line of the page, "periodic circuit" is corrected to "synchronous circuit". (4) Correct "Switch to battery power in case of emergency" in lines 8 to 9 of the same paragraph 6 to read "in normal situations." 2, allowed jk ice range 1. Open power supply? In the MVC inverter power supply system, which operates the inverter section smoothly and switches to the battery in an emergency to fully supply power to the load, a synchronous circuit gold film that operates the inverter section in synchronization with the main power source. Output voltage fluctuation prevention device for inverter power supply equipment with all features.

Claims (1)

[Claims] 1. In an impark power supply device that rectifies and smoothes commercial power to operate the impark section, and in an emergency switches to a battery to supply power to the load, the period at which the impark unit operates in synchronization with the commercial power source. The output type 71 of the impark power supply device is characterized by all stages of the circuit: fluctuation prevention device.