JPS59201642A - No instantaneous stop switching circuit of energizing line - 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 a switch circuit that switches energized lines in any phase without momentary interruption, and particularly relates to a switch circuit that switches a current-carrying line in any phase 33 without momentary interruption. .

G, ), etc.; hereinafter referred to as "backup power supply". ] and a system bypass circuit (a standby energized line that directly sends power from the standby power source to the load) without stopping the power supply to the load in the event of a failure or inspection of the power supply system including the inverter device that is operating synchronously. The present invention relates to an Ill-interruptionless switching circuit that performs switching in any phase without momentary interruption.

Technology for Blue Conventional uninterruptible power supply systems to which computers, communication stations, etc. are connected as loads generally use constant frequency and constant voltage power supplies equipped with an impark device. When performing maintenance and inspection, it is necessary to directly send the standby power supply voltage via a bypass circuit (standby energized line) without stopping the power supply to the load.

Therefore, one of the static switches △CSW> installed on the current-carrying line is forcibly extinguished to turn off the constant-frequency constant-voltage power supply (
Hereinafter referred to as F main power supply]. ) and instantaneously set the other static switch (ΔC3W) to 1, thereby performing instantaneous switching to the bypass circuit.

Figure 1 shows an example of the configuration of a conventional power supply system that is equipped with the above-mentioned forced arc extinguishing circuit and performs instantaneous interruption switching of the energized line. In the figure, 1 is a constant frequency constant voltage power supply (main power supply). , 2 is the main energized line, 3 is the static switch <△CSW> unit 1 equipped with a forced extinguishing circuit, 4 is the input terminal to which the backup power supply voltage is applied, 5 is the backup energized line, and 6 is the opening/closing of the backup energized line. 7 is a load connection terminal of the power supply system, and 8 is a load.

The switch unit 3 has inductance with diodes D1 to D4 and thyristors T111 to T113.

The static switch 6 includes a resistor Th4. It is constructed with 15 rivers. Thyristors Th+ to Ths are all opened by a control signal from a static switch gate control circuit (ΔC3W-GC; not shown).

FIG. 2' is an explanatory diagram of the operation of Cyrisk at the time of switching the energized line in the power supply system. When main power supply 1 is operating in 1 mode, thyristor Th+, T112 (on,
The lower circuits 113 to T1) 5 are in an off state, and power is supplied to the load 8 via the main energizing line 2. Time 1-
Suppose that it becomes necessary to switch to the backup N line 5 at x (for example, due to a failure at λ), an arc-extinguishing pulse is applied to iris 7-113 k, thyristors Th + and Th 2 are turned off, and thyristor 12 is turned off. T114. T115 is turned on by 1 to Rikapulse, the main power supply 1 connected to the main energizing line 2 is disconnected from the corner shift 8, and a backup power source is provided to the load via the auxiliary energizing line 5.

In this way, there is almost no switching of the energized line! 4 of static switch unit 3 equipped with a forced arc extinguishing circuit! The +7 configuration was complicated, had many parts, and was expensive.

On the other hand, there is a system19 in which switching is performed using a static switch that does not require a forced arc-extinguishing circuit.In this method, after turning off the static switch of the main energized line, when the AC voltage passes through zero, This is a so-called zero-cross switching operation in which the static switch's sirisk is turned on, and depending on the phase of the AC voltage at the time when a failure occurs in the constant frequency constant voltage power supply (main power supply), switching of the current-carrying line may take a considerable amount of time. This causes a time delay and is not suitable for power supply systems for loads that require non-instantaneous switching.

DISCLOSURE OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems. ! JL's objective is to provide a non-instantaneous switching circuit for energized lines configured using static switches that do not use forced arc-extinguishing circuits, and in particular, constant frequency constant voltage power supplies that operate synchronously with other power sources (standby power sources). An object of the present invention is to provide an uninterruptible switching circuit suitable for switching energized lines in the event of a failure in an uninterruptible power supply system equipped with a main power supply including an impark device.

In order to achieve the above object, the instantaneous uninterruptible switching circuit of the present invention includes first and second static switches installed in the current-carrying line between the main power source and the standby power source, respectively. ,
A nine-load current waveform detection circuit including a current transformer provided between the first static switch and the load, a current direction detection signal from the load current waveform detection circuit, a switching command signal from the logic sequence circuit, etc. are input. and a static switch control circuit for generating switching control signals for the first and second static switches.

The non-instantaneous switching circuit of the present invention, which is constructed with 4fa, does not require a forced arc-extinguishing circuit, and can be configured by, for example, two circuits connected in parallel in opposite directions.
A simple built-in static switch can be used,
Moreover, since the switching control uses the current direction detection signal g, for example, if the constant frequency constant voltage power supply (main power supply) fails, the switching to the synchronized pre-fiifi power supply is performed immediately. Effects such as completely eliminating the influence of load can also be obtained.

Best mode for carrying out the invention Hereinafter, the present invention will be explained in detail by way of examples.

FIG. 3 is a block diagram showing the configuration of an embodiment of an uninterruptible power supply system including an uninterruptible switching circuit according to the present invention. In the figures, the same reference numeral 8 as in the previous section indicates the same or equivalent parts. A constant frequency and constant voltage power supply (main power supply) 1 includes a semiconductor switching element (for example, Zyristor, 1
- inverter device 1 configured with a transistor, etc.)
1, a gate controller h roll circuit 12 that controls the semiconductor switching elements, a protection circuit 13 that detects a failure in the inverter device 11 and takes measures, and a power supply section and a backup power source of the inverter device (not shown). It is equipped with a circuit that synchronizes with the 30 is a first static switch which, like the second static switch 6, has two thyristors l-h 11. 117 are connected in parallel in opposite directions.

14 inputs the output signal from the protection circuit 13 and connects the energized line 2
Determine whether it is necessary to switch and 5...i and turn it off? Logic sequence circuit that generates command A8, 15 (J 1st and 2nd
The static switch control circuit 16 is a load current waveform detection circuit including a current transformer provided on the main current carrying line 2.

The static switch control circuit 15 inputs a switching command signal from the logic sequence circuit 14 and a current direction detection signal from the load current waveform detection circuit 1G, and controls the first and second static switches 30 and 6.
The switching control signal of 13 1 is illuminated.

FIG. 4 shows a'3('
FIG. 3 is an explanatory diagram of the operation of the thyristor when switching the energized line.

When the main power supply 1 is operating normally, the thyristor Th of the first static switch 30.

T117 is on, T117 of the second static switch 6 is in the off state, and power is supplied to the load via the main conductive line 2. When the switching control signal is issued from the smartphone switch control circuit 15 (time Tx), the Cyrisk Th4 or T1]5 is turned off depending on the current direction of the load current at that time. Either one of them is immediately turned on, and the power to the load is switched to J: which is supplied from the backup power supply via the backup energizing line 5. And Sairisk T1
14. Among Th s, the one that was not ONL yet,
Time I when the AC voltage connected to the load turns zero
To ), it is triggered by a control signal from the control circuit 15 and turns on.

Therefore, at time Tx, when the main power supply 1 is disconnected from the load 8 by the static switch 30, the static switch 6 starts operating, and the preliminary power supply voltage applied to the input terminal 4 without momentary interruption is applied to the preliminary energized line. 5 to a load 8.

That is, as soon as the main power supply 1 stops (time Tx), synchronized AC voltage is supplied to the load 8 via the preliminary energization line 5.

As explained above, the non-instantaneous switching circuit for energized lines of the present invention uses an extremely simple study switch that does not require a forced extinguishing circuit, and uses a very simple study switch that does not require a forced extinguishing circuit. Can be switched.

[Brief explanation of drawings]

Figure 1 is a professional X-ray diagram showing an example of the configuration of a power supply system that uses a conventional non-instantaneous switching circuit; An explanatory diagram, FIG. 3 is a rib block diagram showing an embodiment of a power supply system equipped with a non-instantaneous switching circuit for energized lines according to the present invention,
FIG. 4 is an explanatory diagram of the operation of the thyristor when switching the energized line in the power supply system shown in FIG.
...Main energizing line, 3...Static switch unit, 4...
...Input terminal, 5...Preliminary energized line, 6...Static switch, 8...
iA hook, 11... Inverter device, 13-... Protection circuit, 14... Logic sequence circuit, 15...
...Static switch control circuit, 16...
- Load current waveform detection circuit, 30... Static switch. Applicant Nihon Denki Seiki Co., Ltd. Agent Masu 11 Takeo Figure 1 Figure 2 Tx n-ta

Claims (2)

[Claims] (1) A fixed-frequency power supply line that directly transmits power from a commercial frequency power source or rotating power source (hereinafter referred to as "standby power source") to the load, and an inverter device that operates in synchronization with the standby power source. The above-mentioned open power line is connected to an uninterruptible power supply system that includes a voltage power supply device (hereinafter referred to as "main power supply"), a main current-carrying line that sends the output of the main power supply to the load, and a protection circuit for preventing accidents of the inverter device. A non-instantaneous switching circuit for the main energized line and a second static switch provided on the main energized line and the auxiliary energized line, a control circuit for the static switch, and a switch provided on the main energized line. The static switch control circuit is constructed by drawing a current waveform detection circuit and a logic sequence circuit that inputs the output signal from the protection circuit, determines whether or not to switch the energized line, and generates a switching command signal. inputs the current direction detection signal from the rectangular tube current waveform detection circuit and the switching command signal from the logic sequence circuit to generate switching control signals for the first and second study switches. Features a non-instantaneous switching circuit for energized lines. (2) The first and second static switches each include two thyristors (Th 6 , TIT 7 and Th4.Tl1s) connected in parallel in opposite directions, and the static switch control circuit The generated switching control signal turns off the conduction of the first static switch Thyrisk (Thb, T117) and at the same time turns off the conduction of the Thyrisk (Thb, T117) of the second static switch.
The outpost of the current-carrying line according to claim 1, which turns on one of h4 or h5) and turns on the other side risk when the load current waveform becomes zero potential. 11i switching circuit.