JPH01270729A - Rush current suppressing system - Google Patents

Abstract

PURPOSE:To alleviate the load of a common section of a power source and a power supply passage by closing the passages to power sources at intervals equal to protecting time. CONSTITUTION:In sequence closing circuits 4, counting means 300 starts counting when a start signal is input out of the circuit, and detects the lapse of a protecting time exceeding a period of time that a rush current is continued when a voltage from a power source 100 is applied to a load 200. Power supply passage setting means 400 closes a power supply passage 2 to the load 200 until the lapse of the protecting time is detected by the means 300. Further, starting means 500 transmits a start signal to other sequence closing circuit of following means connected to its own circuit when the means 300 detects the lapse of the protecting time. Thus, since the passages to the power sources are closed at intervals equal to the protecting time, it can prevent the rush currents of the power supply currents from superposing onto the power sources.

Description

[Detailed Description of the Invention] [Summary] Regarding an inrush current suppression method in a power supply system that supplies power from a power supply to multiple loads, the present invention aims to suppress as much as possible the inrush current that flows out from the power supply when power supply starts. , A sequence input circuit is installed in each power supply path connecting the power supply and each load, and each sequence input circuit starts timing when a start signal is input from outside the circuit, and when power is applied to the load. a timer for detecting the elapse of a predetermined protection time that exceeds the time during which the inrush current continues for m; A power supply path setting means that closes a power supply path to a corresponding load, and a timer means that transmits a start signal to other subsequent sequence input circuits connected to the own circuit when the timer detects that the protection time has elapsed. In addition, a current limiting resistor is inserted in the power supply path connecting the sequence input circuit and the load for a predetermined period of time that exceeds the duration of the inrush current when power is applied. The configuration is such that an inrush current suppression circuit is provided.

[Industrial application field]

The present invention relates to an inrush current suppression method in a power supply system that supplies power from a power source to a plurality of loads.

For example, in an electronic exchange or the like that uses multiple types of DC voltages, multiple sets of power supply devices are used that receive commercial power and generate the required DC voltages.

Furthermore, in large-scale electronic exchanges and the like, multiple sets of power supplies as described above are installed in a distributed manner.

In this type of power supply system, when starting power supply,
A transient current that is warmer than the supply current in steady state,
That is, an inrush current occurs immediately after the start, placing an excessive burden on the power supply system and the power supply path.

[Conventional technology]

FIG. 6 is a diagram showing an example of a conventional power supply device connection state, FIG. 7 is a diagram showing an example of a conventional multiple power supply device connection state, and FIG. 8 is a diagram showing an inrush current generation situation in FIG. It is a figure which illustrates.

In FIG. 6, a power supply device 3 is connected to a power supply system 1 having a commercial power supply 11 and a switch 12 via a power supply line 2. In FIG.

A capacitor or a transformer is connected to the power receiving circuit of the power supply device 3, and at time 1. When the switch 12 is turned on at The transient time T is determined by the time constant of . After , it decays to a steady value.

Note that the maximum value of the rush current reaches about ten times the steady current value.

Furthermore, as shown in FIG. 7, the power supply system 1 includes a plurality of power supply devices 3-
1 to 3-n are connected, when switch I2 in power supply system 1 is turned on, the rush current of each power supply device 3-1 to 3-n is superimposed from power supply system 1 to power supply path 2. It will leak out.

[Problem to be solved by the invention]

As is clear from the above description, in a conventional power supply connection state, when power supply starts, a rush current that is warmer than the steady current flows out, placing an excessive burden on the power supply system and the power supply path.

In particular, when a plurality of power supply devices are fed in parallel, there is a problem in that the inrush currents of each power supply device are superimposed and have a large effect.

An object of the present invention is to suppress as much as possible the inrush current flowing out from the power supply when power supply starts.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, 100 is a power supply, 200 is a load, and 2 is a power supply path connecting the power supply 100 and each load 200, forming a power supply system.

Reference numeral 4 denotes a sequence input circuit provided in the power supply line 2 that connects the power supply 100 and each load 200 according to the present invention.

Reference numeral 300 denotes a clock means provided in the sequence input circuit 4 according to the present invention.

400 is a power supply path setting means provided in the sequence input circuit 4 according to the present invention.

500 is a starting means provided in the sequence input circuit 4 according to the present invention.

5 is a sequence pitcher circuit 4 according to the invention according to claim 2.
This is an inrush current suppression circuit provided in the power supply line 2 connecting the load 200 and the load 200.

[Effect]

In each sequence input circuit 4, the clocking means 300:
Starts timing when a start signal is input from outside the circuit,
The elapse of a protection time determined to exceed the time during which an inrush current continues for m when the power source 100 is applied to the load 200 is detected.

Further, the power supply line setting means 400 closes the power supply line 2 to the corresponding load 200 at a predetermined time until the time measurement means 300 detects the passage of the protection time.

Furthermore, when the timer 300 detects that the protection time has elapsed, the activation means 500 transmits an activation signal to another subsequent sequence input circuit 4 connected to its own circuit.

Note that in the power supply system, the power source 100 is
Means for inputting a start signal when the power supply 100 is applied is provided, and timing is started simultaneously with the application of the power supply 100.

The inrush current suppression circuit 5 inserts a current limiting resistor into the power supply path 2 for a predetermined period of time that exceeds the duration of the inrush current after the power supply 100 is applied.

Therefore, according to the invention described in claim 1, since the power supply paths to each power supply device are closed at intervals equal to the protection time, it is possible to prevent the inrush currents of the power supply currents to overlap with each other. , the burden on the common parts of the power supply and power supply path is reduced.

Further, according to the second aspect of the present invention, by providing the inrush current suppression circuit between the sequence input circuit and the power supply device, the instantaneous value of the inrush current is significantly suppressed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing an inrush current suppression method according to an embodiment of the present invention, FIG. 3 is a diagram illustrating the power-on process in FIG. 2, and FIG. 4 is a diagram illustrating the inrush current suppression method in FIG. 2. 5 is a diagram illustrating a circuit, and FIG. 5 is a diagram illustrating a power-on process in FIG. 4. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 2, as the power supply 100 in FIG.
A power supply system 1 comprising a commercial power source 11 and a switch 12 is shown, and a power supply device 3 is shown as a load 200 in FIG.

Further, in the sequence input circuit 4, a timer relay 41 is provided as the time measurement means 300 in FIG.
A power relay 42 is provided as the power supply path setting means 400 in FIG. 1, and control relays 43 and 44 are provided as the starting means 500 in FIG.

In Figure 2, the power supply system is configured such that power is supplied from a power supply system 1 to three sets of power supply devices 3 (individual power supply devices are referred to as 3-1, 3-2 and 3-3, hereinafter the same). System 1
A sequence input circuit 4 is provided in each power supply path 2 that connects the power supply device 3 and each power supply device 3 . Note that in FIG. 2, only the configurations of the sequence input circuits 4-1 and 4-2 are shown, and the configuration of the sequence input circuit 4-3 is omitted. 3 will be explained assuming that it has the same configuration as the sequence input circuits 4-1 and 4-2.

Start signal transmission terminals 48-1 and 49-1 provided in the sequence input circuit 4-1 and the sequence input circuit 4-
Starting signal receiving terminals 46-2 and 47- provided in 2
2 are connected to the start signal transmitting terminals 48-2 and 49-2 provided in the sequence input circuit 4-2, and start signal receiving terminals 46-3 and 47- provided in the sequence input circuit 4-3. However, the sequence starting circuit 4-1, as the specific sequence starting circuit 4 in the invention according to claim 2, sends a start signal to the timer 300 when a power supply of 1°O is applied. As a means for inputting the activation signal, activation signal receiving terminals 46-1 and 47-1 are directly connected externally.

In FIGS. 2 and 3, the switch 12 of the power supply system 1
is not turned on, each sequence input circuit 4
-1 to 4-3, each timer relay 41, power relay 42, and control relay 43 and 44 are all in a restored state, and the power supply line connecting the power supply system 1 and each power supply device 3-1 to 3-3 2 is the contact point 421 and 4 of the power relay 42
It is opened by 22.

In this state, when the switch 12 is turned on at time t11, only the timer relay 41-1 in the sequence input circuit 4-1 whose activation signal receiving terminals 46 and 47 are short-circuited is connected to the power supply line 2 and the transformer 45. -1 to the commercial power supply 11, and after a predetermined operating time TI as the protection time has elapsed, at time 1. □, contact 4
11-1 is closed.

Note that the operating time T is set to be sufficiently longer than the transient time T for the inrush current to continue w1 when the power supply device 3 starts supplying power.

When contact 411-1 is closed, power relay 42-1 is connected to commercial power supply 11 via feed line 2 and transformer 45-1 and operates at time t13, closing contacts 421-1 and 422-1. conclude.

By closing the contacts 421-1 and 422-1, the power supply path 2 between the power supply system 1 and the power supply device 3-1 is closed, and the power supply path 2 from the commercial power supply 11 to the contacts 421-1 and 422-1 is closed.
A power supply current (2) is started to be supplied to the power supply device 3-1 via the power supply device 3-1.

When the power supply device 3-1 receives power, the sequence input circuit 4-
The control relay 43-1 in 1 operates, and the contact 431-1
and 432-1 are closed.

By closing contact 431-1, control relay 44-1 is connected to commercial power supply 11 via power supply line 2 and transformer 45-1, and operates at time t14, opening contact 441-1 and starting the timer. While restoring relay 41-1, contact 4
42-1 and start signal transmission terminals 48-1 and 4.
9-1 is short-circuited and transmitted as a start signal to the sequence input circuit 4-2.

Note that even after the timer relay 41-1 is restored, the power relay 42-1 continues to connect to the commercial power supply 1 through the contact 432-1.
1 and continues operation, and the control relays 43-. 1
and 44-1 also continue to operate.

On the other hand, in the sequence input circuit 4-2, at time t1
4, the start signal transmitted from the sequence input circuit 4-1 short-circuits the start signal receiving terminals 46-2 and 47-2, and the timer relay 41-2 in the sequence input circuit 4-2 is supplied with power. It is connected to commercial power supply 11 via line 2 and transformer 45-2.

Thereafter, by the same process as in the sequence input circuit 4-1, after the timer relay 41-2 has elapsed the operating time T1, the time t is reached. Then, power relay 42-2 operates at time tts, and contacts 421-2 and 422-2
By closing, the power supply line 2 between the power supply system 1 and the power supply device 3-2 is closed, and the power supply line 2 from the commercial power supply 11 to the contact 421 is closed.
-2 and 422-2, power supply current ■° is started to be supplied to the power supply device 3-2.

When the power supply device 3-2 receives power, the sequence input circuit 4-
The control relay 43-2 in 2 operates, and then the control relay 44-1 operates at time tz4, opening the contact 441-2 to restore the timer relay 41-2, and opening the contact 442-2. , thereby short-circuiting the start signal transmission terminals 48-2 and 49-2, and transmitting the start signal to the sequence input circuit 4-3 as a start signal.

On the other hand, in the sequence input circuit 4-3, the time tz
The start signal transmitted from the sequence input circuit 4-2 to a causes the start signal receiving terminals 46-3 and 47-3 to be short-circuited. In the process, the timer relay 41-3 in the sequence input circuit 4-3 operates at time t3t after the operation time T, and then the power relay 42
-3 operates at time t33, and power supply system 1 and power supply device 3-3
The power supply line 2 between the two is closed, and the power supply current (2) is started to be supplied from the commercial power supply 11 to the power supply device 3-3.

In the above process, from the power supply system 1, as shown in Fig. 3 (
, the power supply current l supplied to the power supply device 3-1 starts flowing out from time t13, and after the inrush current continues for m during the transient time T0, it decays to a steady value, and at a time point after the operation time T from time L13. Power supply current from Lt3 to power supply device 3-1■
The power supply current I7'+ (which is superimposed on the steady value) and supplied to the power supply device 3-2 starts flowing out, and after the inrush current continues for a transient time T, it attenuates to the steady value and starts operating from time t23. At time T, from later point in time t!3, the power supply current ■ is superimposed on the power supply current I to the power supply device 3-1 and the power supply current ■ to the power supply device 3-2 (both steady values) and is supplied to the power supply device 3-2. starts to flow out, and after the inrush current continues for a transient time To, it attenuates to a steady value.

Therefore, the steady-state values of the power supply current (■) for each power supply device 3-1 to 3-3 are sequentially superimposed, but the duration of the inrush current is different from the operating time T, and the inrush current is superimposed. There is no risk of leakage.

The inrush currents generated after each time point tll, tg2, and t0 have the same instantaneous value as shown in FIG. By inserting the inrush current suppression circuit 5 as shown in the figure, the inrush current is suppressed as shown in FIG.

In FIGS. 4 and 5, when the feed line 2 is not closed in the corresponding sequence input circuit 4, a current limiting resistor 51 is inserted in series with the feed line 2.

In this state, when the power supply line 2 is closed by the sequence input circuit 4 corresponding to the time point t, the current limiting resistor 5 in the inrush current suppression circuit 5 is connected from the power supply system 1 (not shown) to the power supply line 2 and the current limiting resistor 5 in the inrush current suppression circuit 5.
1 and the transformer 56, the power supply device 3 is supplied with a current I
starts supplying power, and during the transient time T0, the inrush current as shown in FIG. 8
The value is suppressed to a significantly lower value than when the power supply device 3 is directly connected to the power supply system 1 as shown in the figure.

At the start of power supply, the timer relay 52 connected to the power supply path 2 via the transformer 56 starts operating, and after a predetermined operating time T, ° has elapsed, operates at time t2,
Contact 521 is closed.

Note that the operating time T is the transient time T during which the inrush current continues.
It is set sufficiently longer than 0.

When the contact 521 is closed, the power relay 53 is activated at time t3.
The contact 531 is closed to short-circuit the current limiting resistor 51, and the contact 532 is closed to short-circuit the control relay 5.
Operate 4.

Due to the short circuit of the current limiting resistor 51, the inrush current suppressing circuit 5
The losses in the feed line 2 within the range are significantly reduced, and the feed current I
The current value increases, but no inrush current occurs as at time tl.

On the other hand, when the contact 532 is closed, the control relay 54 is operated, and when the contact 541 is closed, the control relay 55 is operated.
operates and opens contact 551 to restore timer relay 52, but power relay 53 continues to operate through contact 542, and control relays 54 and 55 continue to operate.

As is clear from the above description, according to this embodiment, after the switch 12 is turned on, each power supply device 3-1 to 3-3
Since the power supply paths 2 are closed at intervals equal to the operating time T of the timer relay 41, the inrush current of the power supply current (■) to each power supply device 23-1 to 3-3 is prevented from being superimposed. be done.

Furthermore, by providing the inrush current suppression circuit 5 between the sequence input circuit 4 and the power supply device 3, the instantaneous value of the inrush current can be significantly suppressed.

Note that FIGS. 2 to 5 are only one embodiment of the present invention, and for example, the load 20 to which the power supply path setting means 400 corresponds
The time to close the power supply path 2 for 0 is determined by the timing means 100.
It is not limited to the time when the protection time has elapsed, and many deformations are considered immediately after the start of time measurement.
In either case, the effects of the present invention remain the same. Further, the configurations of the sequence input circuit 4 and the inrush current suppression circuit 5 are not limited to those shown in the drawings, and many other modifications may be considered, but the effects of the present invention remain the same in any case. Furthermore, it goes without saying that the power supply system to which the present invention is applied is not limited to that shown in the drawings.

〔Effect of the invention〕

As described above, according to the present invention, the power supply path for each power supply device is
Since they are closed at intervals equal to the protection time,
Inrush currents of power supply currents for each power supply device are prevented from being superimposed, and the burden on the common portion of the power supply and power supply path is reduced.

Further, according to the third aspect of the present invention, by providing the inrush current suppression circuit between the sequence input circuit and the power supply device, the instantaneous value of the inrush current is significantly suppressed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an inrush current suppression method according to an embodiment of the present invention, FIG. 3 is a diagram illustrating the power-on process in FIG. 2, and FIG. is a diagram illustrating the inrush current suppression circuit in FIG. 2, FIG. 5 is a diagram illustrating the power-on process in FIG. 4, FIG. 6 is a diagram illustrating an example of a conventional power supply device connection state, and FIG. FIG. 8 is a diagram illustrating an example of a state in which a plurality of conventional power supply devices are connected, and FIG. 8 is a diagram illustrating the inrush current generation situation in FIG. 6. In the figure, 1 is a power supply system, 2 is a power supply path, 3 is a power supply device,
4 is a sequence input circuit, 5 is an inrush current suppression circuit, 11
is a commercial power supply, 12 is a switch, 41 and 52 are timer relays, 42 and 53 are power relays, 43.44.
54 and 55 are control relays, 45 and 56 are transformers, 51 is a current limiting resistor, 411 to 551 are contacts,
100 is a power supply, 200 is a load, 300 is a timing means, 40
0 indicates a power supply path setting means, and 500 indicates a starting means. Kifuyuro's Desperate Z Act 1 Te 2 Figure 2 Leap Niwa t73 Rush-Incoming Power 2 Suppression 1st Loto Rod 4 g

Claims (2)

[Claims] (1) In a power supply system that supplies power from a power supply (100) to a plurality of loads (200) in parallel, each sequence input circuit ( 4), and in each sequence input circuit (4), when a start signal is input, time measurement is started and the load (4) is
200), a timer (300) for detecting the elapse of a predetermined protection time that exceeds the time during which an inrush current continues when the power source (100) is applied to the power supply (100); and the timer (300) starts timekeeping. a power supply path setting means (400) for closing the power supply path (2) to the corresponding load (200) at a predetermined time after detecting the elapse of the protection time; and the timekeeping means (300). ) detects the elapse of the protection time, a starting means (500) is provided for transmitting a starting signal to the other subsequent sequence input circuit (4) connected to the self-circuit. Inrush current suppression method. (2) In the inrush current suppression method according to claim 1, when the power source (100) is applied to the power supply path (2) connecting the sequence input circuit (4) and the load (200), the inrush current An inrush current suppression system characterized in that an inrush current suppression circuit (5) is provided which inserts a current limiting resistor into the power supply path (2) for a predetermined period of time that exceeds the duration of the inrush current suppression circuit (5).