JPS5822547A - No-break power source device - 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] TECHNICAL FIELD The present invention relates to an improvement of an uninterruptible power source device.

Generally, an uninterruptible power supply device is configured as shown in the block diagram shown in Figure 1, and uses a DC power source such as a battery or an AC power source in the main system as the main power source PS, and an AC power source in a separate system as a backup. Used as AC power supply, main power supply P
A switch S1, s that alternately turns on the output of an AC stabilized power supply R (hereinafter referred to as a current power supply) PE, such as a switching inverter, whose input is S, and the backup AC power supply AC.
.

It is designed to be selectively switched and connected to the load on the output OUT side.

In addition, a control unit CT is provided for the AC power supply PE.]
, thereby driving the switches St, S, and
Based on the outputs of the backup AC power supply AC and the AC power supply PE, the operation of the AC power supply PK is kept in synchronization with the backup intercurrent power supply AC, and the output voltage of the AC power supply PE is maintained at a specified value. .

Note that the AC power supply PE has better voltage fluctuations than the backup AC power supply AC, so the switch IT is generally off and the switch S2 is on at all times, and the AC power supply PE supplies power to the load. However, if a power outage occurs in the output of the multi-AC power supply PE for some reason, switch S! is on, switch S2 is off,
Power is supplied to the load from the backup AC power supply AC, and the AC power supply 1i! j [In response to the recovery of the output of PE, switch 81 is turned off, switch S1 is turned on, and power is supplied from the AC power supply PE again. Therefore, power is not supplied to the load in an uninterrupted state. This makes it possible to operate the load stably.

However, if the waveform of the valley in FIG. 1 is shown as a timing chart in FIG. 2, the drive signal (a), (
In response to the change in b), switch 81 is turned off and switch S2 is turned off.
When the AC power supply P switches on simultaneously and instantaneously,
Since Σ suddenly changes from the previous no-load state to the loaded state, p,
The load voltage (C) once decreases and then reaches the specified value, resulting in fluctuations in the load voltage (C) and, in extreme cases, a drawback that the operation of the load becomes unstable.

As a countermeasure for this, when switching switch S1+8m, turn on both at the same time for a certain period of time, and
Although a method has been proposed for supplying load current from both C and the AC power supply PE to prevent fluctuations in the load voltage, this method complicates the configuration of the control unit CT;
This results in drawbacks such as the overall cost.

The present invention has the purpose of fundamentally solving the drawbacks of the conventional art, and has the purpose of differentiating the output of a voltage detector that detects the output voltage of an AC power supply and the drive signal for switching the switch to the AC power supply side. A variable phase shifter, which phase-shifts the output of a synchronous oscillator that synchronizes the operation of the AC power supply with respect to the backup AC power supply and supplies it to the AC power supply, is controlled by the added output, and the AC power supply is The present invention provides an extremely effective uninterruptible power supply device that suppresses load voltage fluctuations when the load suddenly becomes high.

Hereinafter, the present invention will be explained in detail with reference to FIG. 3 and subsequent figures showing embodiments.

FIG. 3 is a block diagram showing the configuration, and FIG. 4 is a tying chart showing the waveforms of each part in FIG.
C is provided with a synchronous oscillator SYG, and the preliminary current transformer AC
and the output of the AC power supply PK are input, and after detecting the phase difference between the two, a control signal is sent to the backup AC power supply AC to put the AC power supply PE into a synchronous operation state, and this output is varied. The phase shifter VP8 shifts the phase by a predetermined amount according to the output of the adder ADD, and supplies the phase shift to the AC power supply PE, thereby synchronizing the operation of the AC power supply PK with the backup AC power supply AC. , the output voltage of the power supply PE is controlled. On the other hand, a voltage detector VDT using a comparator or the like detects the output voltage of the AC power supply PR, determines the difference voltage from the reference voltage, and also detects the output voltage of the AC power supply PR. s1. s.

A drive circuit D that sends drive signals (a) t (b) to
There is an RV and its switch 8. The differential amount MDKF differentiates the drive signal (b) for the differential output, and a differential output is generated.

In addition, the detection power (c) of the voltage detector VDT and the differential output (d) of the differentiator circuit DEF are added by an adder ADD, and are also given as a control input to the variable phase shifter vps. Voltage detector VDT or variable phase shifter vPS
A control loop is formed for maintaining the output voltage of the AC power supply RPE and the AC power supply RPE at a specified value.

Therefore, as shown in FIG. 4, the drive signal (b) is generated at the same time as the drive signal (a) disappears, and the switch S1 is turned off.
When the switch S2 is turned on at the same time and the relationship between the two switches to the AC power supply PE @, the output voltage of the AC power supply PE decreases and the detection power of the voltage detector VDT (c) When the output voltage gradually reaches the specified value due to the action of the control loop, the detection power (c) also recovers.

Then, depending on the leading edge of the drive signal (b), the differentiating circuit DID
F generates a differential output (d), which has a waveform that compensates for the decrease in the detected force (Q), so the adder ADD adds the Ryokawa forces (C) and (d) and then performs a variable phase shift. When applied to VPS, its output immediately compensates for the drop in output voltage, the output voltage of AC power supply PH does not drop, the load voltage (-) does not change at all in the waveform, and at the same time the voltage No fluctuations will occur.

That is, by setting the output voltage of the AC power supply PE to rise in accordance with the rise in the output of the adder ADD, the output voltage is forced to rise due to the differential output (d), and the output voltage suddenly increases. It is possible to completely compensate for the output voltage drop under load conditions.

Note that the differential output (d) may have a waveform that offsets the decrease in the output voltage, and this condition can be achieved by selecting the time constant of the differentiating circuit DEF.

In addition, as the variable phase shifter vps, an AC power supply device PE
When using a switching inverter, a triangular wave etc. is generated in synchronization with the output of the synchronous oscillator SYG, the high level side of the triangular wave etc. is extracted by the threshold level corresponding to the control input, and the extracted triangular wave etc. is used. , one that controls the flow time of switching elements in a switching inverter is suitable.

The configuration of the phase shifter, variable phase shifter P8, voltage detector VDT, etc. can be arbitrarily selected according to the conditions, and the switches S, , S,
For this purpose, a high-speed semiconductor switching element or an electric switching device may be used depending on the characteristics of the load with respect to the instantaneous power outage time. If the differential output (d) is generated, the present invention can be modified in various ways, such as preventing an increase in output voltage when the AC power supply PE suddenly becomes unloaded.

As is clear from the above description, according to the present invention, load voltage fluctuation does not occur when the load is switched to the AC power supply side, and the load can be operated stably.
Since the structure is simple and inexpensive, it exhibits remarkable effects as an uninterruptible power source device for various uses.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional example, FIG. 2 is a timing chart showing waveforms of each part in FIG. 1, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIG. 4 is a block diagram showing each part in FIG. 3. 3 is a timing chart showing waveforms of FIG. ps-@φ also main power supply, AC116, - standby AC power supply, P
E... Yu-AC stabilized power supply, sl, s.・・・Switch, BYG ・・・轡synchronous oscillator, v
ps -...Horimachi phase shifter, VDT-1...voltage detector, DEF--...differentiation circuit, ADD--...adder, (b) φ...drive signal. Patent applicant: Kyosan Seisakusho Co., Ltd. Agent Masaki Yamakawa (1 person) Engraving of the drawings (no changes to the contents) Figure 1 Figure 2 Figure 3; dl Showa year Month Date Commissioner of the Japan Patent Office 57.1 .29
1. Review of the case display and 6 years patent application No. 1z03'? Anonymous No. 2, Title of the Invention Unaccompanied Cloud Almanac Device 3, Person Making Amendment

Claims (1)

[Claims] It has an AC stabilized power supply device that receives the main power source as input and performs synchronized operation with a backup AC power source, and a switch that selectively switches between the output of the AC stabilized power supply device and the backup AC power source and connects it to a load. In the uninterruptible intermittent power supply device, a variable phase shifter that phase-shifts the output of a synchronous oscillator that synchronizes the operation of the AC stabilized power supply with respect to the backup AC power supply and supplies the AC stabilized power supply to the AC stabilized power supply; An uninterruptible power source device comprising: a voltage detector that detects the output voltage of the variable phase shifter; and an adder that adds the output of the SUI detector and provides it as a control input to the variable phase shifter. .