JP5858034B2 - Uninterruptible power system - Google Patents

Description

  The present invention relates to an uninterruptible power supply suitable for being applied to a device that needs to prevent the occurrence of a power failure during operation of the device, such as a solder device.

  Most devices take some measures against power outages that occur during operation. In many cases, an uninterruptible power supply is provided as a countermeasure against a power failure accident in a soldering device used when mounting electronic components on a printed circuit board.

  Documents 1 to 3 are known as uninterruptible power supplies. The uninterruptible power supply disclosed in Patent Document 1 is connected between an AC power supply and a load as shown in FIG. This uninterruptible power supply device has a switching device 14, and the AC voltage on the input side is directly supplied via the bypass 15, while the converter 16 converts the input AC voltage into a DC voltage and then the capacitor 16. The charged voltage is reconverted into an AC voltage by the inverter 13. This reconverted AC voltage is supplied to the switching device 14 described above.

  When an AC voltage is supplied to the input side, the input side AC voltage itself is supplied to the load 3 because it is switched to the bypass 15 side. During a power failure, the switching circuit operates and the charged AC voltage is supplied to the load 3. As a result, even if a power failure occurs, the load 3 can be operated.

  The uninterruptible power supply device disclosed in Patent Document 2, particularly the uninterruptible power supply device disclosed in FIG. The bypass circuit 55 and the switching circuit 54 in Patent Document 2 correspond to the bypass path 15 and the switching device 14 in Patent Document 1, respectively, and the circuit 51 in Patent Document 2 is a circuit system from the converter 12 to the inverter 13 in Patent Document 1. It corresponds to.

  Further, the uninterruptible power supply apparatus disclosed in FIG. 1 of Patent Document 3 is also provided with a bypass path and a changeover switch, both of which correspond to the bypass path 15 and the switching apparatus 14 of Patent Document 1.

JP-A-9-215345 Japanese Patent No. 2793264 WO2008-126820

  The uninterruptible power supply devices disclosed in Patent Documents 1 to 3 use the precharged voltage when the input AC voltage is cut off, so that the drive voltage is supplied in the same way as during normal operation even during a power failure. We are trying to make it uninterruptible. For this purpose, a power supply path used during normal operation (a bypass path for the input AC voltage) and a power supply path used during a power failure (path using the charging voltage) are provided one by one.

  If for some reason this uninterruptible power supply causes a trouble and an abnormal situation occurs in which the operating voltage is not output from the uninterruptible power supply despite the normal drive voltage being supplied from the input AC source, There is no way to deal with it, and the same abnormal condition as a power outage will occur.

  If this trouble is explained using, for example, Patent Document 1, when the switching device 14 does not operate normally and is still switched to the inverter 13 side, the circuit system from the converter 12 to the inverter 13 is changed. There may be a case where an abnormality occurs and a normal conversion voltage cannot be obtained. In this case, an abnormal state occurs in which the load 3 cannot be operated even though a power failure has not occurred.

  Therefore, the present invention solves such a conventional problem so that the drive voltage from the input AC source can be normally supplied to the load side even when an abnormal state occurs in the uninterruptible power supply itself. An uninterruptible power supply is proposed.

In the present invention to solve the problems described above, through a charging circuit for charging by rectifying an input AC voltage, an inverter for reconverting the charging voltage into an AC voltage, the charging circuit the input AC voltage is in the normal Succoth without supplying the load side with normal during bypass passage, and the uninterruptible power supply unit at the time of power failure and a first switching circuit for supplying to the load side an alternating voltage the reconverted as an output voltage,
An abnormal-time bypass for supplying the input AC voltage to the load ;
The output voltage from the UPS unit, that consists of a second switching circuit for switching between the input AC voltage from the abnormal bypass passage based on the detection output of the output voltage from the uninterruptible power supply unit Features.

According to the configuration of the present invention, when the output voltage (the AC voltage obtained by reconverting the input AC voltage or the charging voltage) is not output from the uninterruptible power supply unit in spite of the uninterruptible state, it is connected to the input AC source side. It described abnormality bypass path side to the switching circuit that is provided a double bypass path to be switched, at the time of normal supplies an input AC voltage itself to the load side, if the abnormal state to an uninterruptible power supply unit itself occurs will be supplied successfully to the load side via the abnormality bypass the driving voltage from the input AC source (input AC voltage).

It is a principal part block diagram which shows an example of the uninterruptible power supply which concerns on this invention. It is a block diagram which shows the state at the time of abnormality of the uninterruptible power supply which concerns on this invention. It is a state transition diagram of the relay at the time of normal and abnormal of an uninterruptible power supply, and at the time of a power failure of an AC source.

  Subsequently, an example of the uninterruptible power supply according to the present invention will be described with reference to the drawings. In FIG. 1, an uninterruptible power supply 110 is connected between an input AC source (AC power supply) 100 and a load (solder device or the like) 150. An example of the input AC source 100 is AC 200V. As shown in the figure, the uninterruptible power supply 110 includes an uninterruptible power supply 110A and an abnormal-time bypass path 110B connected to the input AC source side. The configuration of the uninterruptible power supply 110A will be described.

  The uninterruptible power supply unit 110A has a pair of input terminals a and b to which the input AC source 100 is connected, and a pair of output terminals c and d to which the load 150 is connected. When the input AC voltage supplied via the power switch 101 is removed from the input AC voltage by the noise filter (NF) 104 and then passes through the input terminal a (branch point p). This is supplied to the first switching circuit 103 via the bypass 102.

  In this example, a relay switch is used as the first switching circuit 103. The relay switch includes a first relay circuit 103B and a first changeover switch 103A, and an input AC voltage is supplied to the contact e side of the first changeover switch 103A. The first relay circuit 103B is operated by the input AC voltage supplied to the terminals a (branch points p) and b, and is switched to the contact e side while the first relay circuit 103B is operating (FIG. 1). When the input AC voltage disappears, the broken line is switched to the contact f side, and automatically returns as shown by the solid line in FIG.

  On the other hand, the input AC voltage that has passed through the noise filter 104 and the input terminal a is also supplied to the charging system. In this example, the rectified DC voltage rectified by the converter (rectifier circuit) 105 is reconverted to an AC voltage by the inverter 106, and then supplied to the other contact f side of the first changeover switch 103A described above. Is done. The reconverted AC voltage is used in the event of a power failure of the input AC source 100, details of which will be described later.

  The rectified DC voltage is supplied to the charging circuit 120 through the first diode 108 for preventing backflow and charged. As is well known, the charging circuit 120 includes a charging diode and a capacitor, and charging is performed until the capacitor has a predetermined DC value.

  The charging voltage is used as a substitute for the power failure of the input AC source 100, and is supplied to the inverter 106 via the second reverse current blocking diode 121 and has the same frequency and voltage value as the input AC voltage. Converted to AC voltage.

  Since the first switching circuit 103 exists, the output voltage from the first switching circuit 103 (first switching switch 103A) of the uninterruptible power supply 110A (the output voltage from the output terminal c) is normal. An input AC voltage passing through the bypass 102 or an AC voltage obtained by reconverting the charging voltage is obtained.

As the changeover switch 107, for example, a mechanical interlocking switch that is turned on / off in conjunction with the on / off of the power switch (power switch) 101 can be used.
Next, the abnormal time bypass path 110B provided in the uninterruptible power supply 110 will be described. The abnormal-time bypass path 110B includes a second switching circuit 125 provided on the output terminal c side and a third switching circuit 130 provided on the input AC voltage path side.

  As the second and third switching circuits 125 and 130, relay switches are used in this example. Accordingly, the second switching circuit 125 is configured by the switching switch (second switching switch) 125A and the second relay circuit 125B as described above, and the third switching circuit 130 is also configured by the third switching switch 130A. And a third relay circuit 130B that controls switching. As shown in the figure, the third changeover switch 130A is a 1-circuit 1-contact type open / close switch.

  The second relay circuit 125B functions as detection means for detecting the output voltage of the output terminals c and d, and the energization state of the second relay circuit 125B is controlled by the presence or absence of the output voltage.

  In this abnormal bypass path 110B, the third changeover switch 130A is supplied with the input AC voltage via the power switch 101 and the noise filter 104, and the third relay circuit 130B itself is also driven by this input AC voltage. It is made to operate.

  The input AC voltage, which is the output of the third changeover switch 130A, is supplied to the other contact h of the second changeover switch 125A. As a drive source for the second relay circuit 125B provided therein, The output voltage obtained on the g side, that is, the output terminals c and e of the uninterruptible power supply 110A is used. The second relay circuit 125B functions as a means for detecting the output voltage obtained at the output terminals c and d.

  The second changeover switch 125A is switched to the contact g side when the second relay circuit 125B is in an operating state, that is, in a state where the output voltage is being output (shown in FIG. 1 as a broken line). On the other hand, the third changeover switch 130 </ b> A is switched in conjunction with the power switch 101. When the power switch 101 is turned on, the third relay circuit 130B is energized and the third changeover switch 130A is turned on (the state shown in the broken line).

With the configuration described above, the input AC voltage (terminals b ′ and a ′) supplied to the first and third relay circuits 103B and 130B and the output voltage (terminal c ′) obtained from the second relay circuit 125B are: Further, it is also supplied to the control circuit 140.
The control circuit 140 controls the entire uninterruptible power supply unit 110A, and a display unit 142 is further connected to the control circuit 140, and the display state is controlled by the state of the input AC source or the like. Details will be described later.

  As the drive source for the first relay circuit 103B used in the first switching circuit 103, the input AC source obtained at the branch point p is used, but the output AC voltage itself (point q) of the power switch 101 is used. In this case, the input AC voltage obtained at the point q is also supplied to the control circuit 140. The operation of the uninterruptible power supply 110 configured as described above will be described with reference to FIG.

(Operation when the power is off)
FIG. 1 shows an off state of a power switch (power switch) 101. Since the power switch 101 is still off, the interlocking switch 107 is also off (shown by the solid line in FIG. 1).

  Since the power is not turned on, the first to third relays La to Lc are all in an off (deactivated) state, so that the drive voltage is not supplied to the load 150.

(Description of normal operation)
This will be described with reference to FIG. When the power switch 101 is turned on, the changeover switch 107 is also turned on (shown by a broken line in FIG. 1), and power supply to the uninterruptible power supply 110 is started, and the input AC voltage is normal through the noise filter (NF) 104. The voltage is applied to the bypass 102 and the converter 105, respectively. At this time, since the input AC voltage is also applied to the first relay circuit 103B via the power switch 101, the first changeover switch 103A is switched to the contact e side by energization of the first relay circuit 103B ( FIG. 1 shows a broken line). By this switching, the input AC voltage itself is output to the output terminals c and d of the uninterruptible power supply 110A.

Output terminal c, because the input AC voltage obtained in d will also be energized second relay circuit 125B and through the changeover switch 107, the second selector switch 125A is switched to the contact g side (FIG. A predetermined input AC voltage is supplied to the load 150, and the load 150 can be normally operated.

  Since the third relay circuit 130B is energized by turning on the power switch 101, the third changeover switch 130A is switched as shown by a broken line, but the second changeover switch 125A is on the contact g side. Since it is switched to (the broken line side), the input AC voltage is not supplied to the load 150 via the third changeover switch 130A.

  In this normal state, since the input AC voltage is supplied to the converter 105 via the noise filter 104, the input AC voltage is converted into a predetermined DC voltage by the action of the converter 105. This converted DC voltage is also supplied to the first changeover switch 103A via the inverter 106 at the subsequent stage, and is also supplied to the charging circuit 120 via the first backflow prevention diode 108. The charging constant of the charging circuit 120 is selected so as to satisfy the charging capacity required by the load 150.

  The output of the charging circuit 120 is supplied to the inverter 106 via the second reverse current blocking diode 121 and reconverted into a predetermined AC voltage. The predetermined AC voltage is an input frequency and voltage value required by the load 150, and the input frequency and voltage value are set by a signal from the control circuit 140 described above.

(Operation during power failure)
When a power failure occurs for some reason, the input AC voltage from the input AC source 100 is interrupted, so that the input AC voltage flowing through the normal bypass path 102 becomes zero and the energization to the first relay circuit 103B is stopped. Therefore, the first changeover switch 103A is automatically switched to the contact f side (shown by the solid line in FIG. 1). As a result, since a predetermined output voltage (charging voltage) is maintained at the output terminals c and d, the power feeding system to the load 150 is automatically switched to the charging circuit system, and the predetermined output is maintained even during a power failure. A voltage can be supplied to the load 150.

  Even during a power failure, the power switch 101 and the changeover switch 107 linked to the power switch 101 remain in the ON state. Therefore, when the power failure is restored, the operation mode is automatically switched to the normal operation mode described above.

  When the present invention is applied to a soldering device, when the capacity of the charging circuit is small, when the power supply system is switched to the system of the charging circuit 120, power is not supplied to the heater that requires a large capacity, It can be set as appropriate, for example, by executing control so as to supply power only to the transfer system for discharging the work in progress in the apparatus to the outside of the apparatus.

(Operation when abnormal)
An abnormal situation may occur in the uninterruptible power supply 110A. This will be described with reference to FIG. This abnormal situation is a case where the output voltage can no longer be obtained from the uninterruptible power supply unit 110A even though no power failure has occurred.

  Such a situation may occur rarely. For example, when the first relay circuit 103B is disconnected or the like and the first changeover switch 103A is automatically switched to the state shown by the solid line, the first backflow prevention diode 108 in the charging circuit system is further provided. This is a case where the charging process is stopped despite the fact that the power supply is cut off and there is an input AC source.

  In such a case, when a certain time (recommended time) elapses, the output of the charging circuit 120 decreases, and the load 150 is eventually stopped. Alternatively, when the backflow prevention diode 121 is disconnected, the power supply to the load 150 is stopped simultaneously with the disconnection. It is necessary to avoid such an abnormal situation.

In this abnormal situation, since the input AC voltage exists, the third relay circuit 130B maintains the energized state. Therefore, as shown in FIG. 2, the third changeover switch 130A is in an ON state (shown by a broken line ).

  On the other hand, when the backflow prevention diode 108 is disconnected, the second relay circuit 125B is deactivated when the output of the charging circuit 120 gradually decreases and the output voltage on the output terminal c side becomes zero. Thus, the second changeover switch 125A automatically returns from the contact g side (shown by the solid line in FIG. 2) to the contact h side (shown by the broken line). By the second and third switching circuits 125 and 130, an abnormal time bypass path 110B is formed between the input AC source 100 and the load 150, and a drive voltage is supplied to the load 150.

  As a result, even when an abnormality occurs in the uninterruptible power supply 110A, the same operating voltage as that in the normal state can be supplied to the load 150 via the bypass line 110B at the time of abnormality. That is, an accident at the time of an abnormality can be avoided by providing a double bypass so as to operate even at the time of an abnormality.

Such abnormal conditions must be notified early and recovered as soon as possible. Therefore, a control circuit 140 and a display unit 142 for monitoring an abnormal state of the uninterruptible power supply unit 110A are provided. In this example, the energization states of the first to third relay circuits 103B, 125B, and 130B with respect to the control circuit 140 are provided. The voltage supply state to these first to third relay circuits 103B, 125B and 130B is monitored.

  As is clear from the state transition diagram shown in FIG. 3, the first to third relays La to Lc are all in an energized state (on state) during normal operation, and the first and third relays La during a power failure. , Lc is in an inactive state (off state). When the output voltage cannot be obtained at the output terminals c and d despite the input AC voltage being supplied, that is, when the backflow prevention diode 108 is disconnected in the abnormal state, the charging circuit 120 While there is an output, the second relay Lb is continuously energized, but when there is no output, the second relay Lb is deactivated. In the above-described example, although the input AC voltage is supplied to the first relay La, it is not operating normally due to disconnection or the like (equivalent to an OFF state). The first relay La is shown as an off state.

  Thus, the operation state of the uninterruptible power supply 110 can be accurately grasped by monitoring the energization states of the first to third relays La to Lc.

  Note that, in the above-described abnormal state, the third switching circuit 130 is also turned off in conjunction with the power switch 101 being turned off, and the energization state of the load 150 is turned off. Similar to the changeover switch 107, the third changeover circuit 130 may have a switch configuration that is turned on / off in conjunction with the on / off of the power switch 101. The third switching circuit 130 is provided as necessary and can be omitted.

  It can be applied to devices that need to realize uninterruptible power (such as soldering devices).

150 load 110 uninterruptible power supply 110A uninterruptible power supply 110B abnormal time bypass path 102 normal time bypass path 103, 125, 130 changeover circuit 103A, 125A, 130A first to third changeover switches 103B, 125B, 130B first to third 3rd relay circuit La-Lc 1st-3rd relay 106 Inverter 107 Changeover switch 120 Charging circuit 108,121 Backflow prevention diode 140 Control circuit 142 Display part

Claims (2)

A charging circuit that rectifies and charges an input AC voltage, an inverter that reconverts the charging voltage into an AC voltage, and a normal-time bypass path that bypasses the input AC voltage without passing through the charging circuit. An uninterruptible power supply having a first switching circuit that supplies the reconverted AC voltage to the load side as an output voltage in the event of a power failure,
An abnormal-time bypass for supplying the input AC voltage to the load;
A second switching circuit that switches the output voltage from the uninterruptible power supply unit and the input AC voltage from the abnormal bypass path based on the detection output of the output voltage from the uninterruptible power supply unit ;
An uninterruptible power supply apparatus, comprising: a control circuit that monitors an abnormal state of the uninterruptible power supply unit according to a voltage supply state to the first and second switching circuits . The second switching circuit is provided with a means for detecting an output voltage from the uninterruptible power supply,
Above when the output voltage from the uninterruptible power supply unit is not output, the second switching circuit uninterruptible power supply of claim 1, wherein a is switched to the abnormal bypass road.

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