JP5366475B2 - Plating equipment with power failure compensation function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plating apparatus with a power failure compensation function which does not require a large capacity uninterruptible power unit, is free from the plating failure even in the occurrence of power failure or voltage drop, and does not occur sudden stop, positional deviation or the like. <P>SOLUTION: The plating apparatus provided with a power failure compensation function comprises a transporting apparatus for transporting a workpiece, DC power source units 1a, 1b for plating, DC power source units 9a, 9b for compensation and the uninterruptible power unit 11, wherein the output of the DC power source units 9a, 9b is connected in parallel to the output of the DC power source units 1a, 1b through diodes 8a, 8b and the power is supplied to the transporting apparatus and the DC power source units 9a, 9b from the output of the uninterruptible power unit 11. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a plating apparatus having a power failure compensation function that does not cause defective plating even when a power failure or voltage drop occurs.

  The plating apparatus includes a conveying apparatus that conveys a workpiece and a plating DC power supply that supplies a plating current between the workpiece and the electrode. In recent years, a long-time power outage rarely occurs suddenly, but a lightning strike or the like can cause a relatively short-time power outage or voltage drop called a momentary power failure. If a power failure or a voltage drop occurs during the plating process, the work is stopped even if it is for a short time, and no plating current is supplied during that time. If the plating current is interrupted, even if the plating current is supplied again after the power failure is restored, the plating will peel off from that part, so it must be peeled off and replated, which requires a lot of work and peeling. In the case of a work that cannot be re-plated, the entire material is discarded, resulting in a large loss.

  In addition, the transport device will cause a sudden stop, misalignment, etc. due to a power failure, and in order to perform automatic operation again, it takes a lot of labor and time for recovery, such as moving the transport device to a fixed position and aligning it. There was a problem that it took. A possible solution to these problems is to supply power to the plating equipment from the uninterruptible power supply. However, since the DC power supply for plating is generally large in capacity, the uninterruptible power supply is also large in capacity. It was rarely implemented because the initial cost of the equipment was high. At present, no plating apparatus that does not cause plating defects at the time of a power failure other than a method of supplying power from such an uninterruptible power supply to such a plating apparatus has been considered, and there is no literature on the plating apparatus.

  The present invention solves the above-mentioned problems, and it is not necessary to use a large-capacity uninterruptible power supply. If a power failure or a voltage drop occurs, a plating failure may occur, or the transport device may stop suddenly or be displaced. It is made in order to provide the plating apparatus provided with the power failure compensation function which does not occur.

  A plating apparatus having a power failure compensation function of the present invention made to solve the above problems includes a transport device for transporting a workpiece, a plating DC power supply device, a compensation DC power supply device, and an uninterruptible power supply device. The output of the compensation DC power supply device is connected in parallel with the output of the plating DC power supply device through a diode, and power is supplied from the uninterruptible power supply to the transport device and the compensation DC power supply device. It is a feature. Here, the output voltage of the compensation DC power supply is a voltage exceeding the voltage obtained by adding the voltage drop of the diode to the polarization voltage between the workpiece and the anode, and less than the plating voltage between the workpiece and the anode during plating. Preferably, this voltage is the invention of claim 2. Also, a switch is provided between the AC input side of the plating DC power supply device and the commercial power supply and the emergency power supply, and either the commercial power supply or the emergency power supply is selectively closed by selectively closing one of the switches. It is possible to supply power to the direct current power supply device for plating from this, and this is the invention of claim 3.

  Furthermore, the uninterruptible power supply includes two input units connected to a commercial power source and an emergency power source, an output unit connected to a load, a semiconductor switch, a bidirectional converter, and an energy storage element. The two input sections are connected to one pole of a semiconductor switch through a switch that is selectively closed, and the other pole of the semiconductor switch is connected to an output section. Connect the AC side of the bidirectional converter and connect the energy storage element to the DC side of the converter, and control the converter to operate the converter to store DC power in the energy storage element during steady operation, When switching from the commercial power supply to the emergency power supply and when switching from the emergency power supply to the commercial power supply, the converter is operated as an inverter so that the DC power stored in the energy storage element is converted to AC power. Preferably be those provided with control means, which is the invention of claim 4. In the invention of claim 4, it is preferable that a switch is provided in parallel with the semiconductor switch constituting the uninterruptible power supply, and control means for controlling the switch to be closed at the start is provided. It is invention of this.

  According to the present invention, the compensation DC power supply device is provided, and the output of the compensation DC power supply device is connected in parallel with the output of the plating DC power supply device via the diode, and the conveying device and the compensation DC power supply device are connected. Since the power is supplied from the uninterruptible power supply, no voltage is applied between the workpiece and the anode even if a power failure occurs because the voltage is applied from the compensation DC power supply. There is no stopping. Since the voltage applied between the workpiece and the anode is equal to or higher than the polarization voltage, there is an advantage that a reverse current does not flow on the plating surface, and even if plating is continued after power failure recovery, it does not peel off from that portion. Since a diode is provided at the output of the compensation DC power supply, the feedback system of the compensation DC power supply is not affected by the output of the plating DC power supply.

  If the output voltage of the compensation DC power supply exceeds the polarization voltage between the workpiece and the anode plus the voltage drop of the diode and is lower than the normal plating voltage, the current that flows is small. Therefore, the compensation DC power supply may have a small capacity, and the uninterruptible power supply may have a small capacity. When the object of compensation is limited to momentary power interruption, the energy storage element incorporated in the uninterruptible power supply may be of a small capacity, and an electric double layer capacitor or the like can be used. If a capacitor such as an electric double layer capacitor is used for the energy storage element, there is an advantage that the maintenance is not required as in the case of using a secondary battery, and the reliability is increased.

  Further, according to the invention of claim 3, an emergency power supply device is provided so that power is supplied to the plating DC power supply device from either a commercial power supply or an emergency power supply. Since power can be supplied from the power source to the DC power supply device for plating, there is an advantage that plating can be continued. According to the invention of claim 4, the commercial power source is used as it is without passing through the inverter in the steady state. Therefore, there is an advantage that the efficiency in the steady state is good. In the invention of claim 4, since the energy storage element only needs to store energy during the start-up of the emergency power supply device at the longest, it may be of a small capacity, and an electric double layer capacitor or the like can be used. According to the invention of claim 5, since the switch provided in parallel with the semiconductor switch is closed at the time of starting, the starting current flows through the switch even when the starting current of the compensation DC power supply device or the like is large. Thus, there is an advantage that the semiconductor switch does not need to have a particularly large current capacity.

Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.
FIG. 1 shows the configuration of a plating apparatus having a power failure compensation function according to the present invention. The plating DC power supply apparatuses 1a and 1b, electric motors 2a, 2b and 2c for driving a conveying apparatus (not shown), an electric motor 2a, Drivers 3a, 3b and 3c for supplying electric power to 2b and 2c, motors 4a and 4b for driving auxiliary machines such as a filter and a circulation pump (not shown), and a switch 5a for controlling the operation stop of the motors 4a and 4b. 5b and the control device 6. Such a configuration is the same as that of a conventional normal plating apparatus. The plating DC power supply apparatuses 1a and 1b, the electric motors 2a, 2b, and 2c, the drivers 3a, 3b, and 3c, the electric motors 4a and 4b, and the like depend on the plating process. Capacity, number of units, etc. are determined as appropriate.

  The outputs of the DC power supply devices 1a and 1b for plating are connected to the workpiece and the anode plate immersed in the plating tanks 7a and 7b. The outputs of the DC power supply devices 1a and 1b for plating are respectively connected to the diodes 8a and 8b. The outputs of the compensating DC power supply devices 9a and 9b are connected in parallel. The commercial DC power supplied to the commercial power input terminal 10 is directly supplied to the plating DC power supply devices 1a and 1b, and the drivers 3a, 3b and 3c, the switches 5a and 5b, the control device 6 and the compensation are provided. AC power is supplied from the uninterruptible power supply 11 to the DC power supplies 9a and 9b for use. The uninterruptible power supply 11 is supplied with commercial AC power supplied to the commercial power input terminal 10.

  The control device 6 has a function of controlling the conveying device so as to sequentially immerse the workpiece in a treatment tank such as the plating tanks 7a and 7b according to a predetermined process, and a plating tank 7a to which each of the DC power supply devices 1a and 1b for plating is connected. , 7b has a function to operate and stop the plating DC power supply 1a, 1b depending on the work tank entering and exiting the tank, and a function to operate and stop the filter, circulation pump, etc. It is as. The transport device is configured to rotate, stop, and stop the electric motors 2a, 2b, and 2c in a predetermined order to carry the work by raising, transferring, and lowering the workpiece. From the control device 6, the electric motors 2a, 2b, and 2c Signals are sent to the drivers 3a, 3b, 3c so as to perform forward rotation, stop, reverse rotation, etc. in a predetermined order. In order to smoothly convey the workpiece by the conveying device, it is preferable to control the speed of each driver 3a, 3b, 3c as an inverter type.

  The control device 6 includes plating DC power supply devices 1a and 1b for supplying a plating current to the plating baths 7a and 7b and compensation DC power supply devices in accordance with the incoming and outgoing baths of the workpieces into and out of the plating baths 7a and 7b. An operation / stop command signal is sent simultaneously to 9a and 9b. At this time, the current of the plating DC power supply devices 1a and 1b can be set from the workpiece data. The output voltage of the compensating DC power supply 9a, 9b exceeds the voltage obtained by adding the voltage drop of the diodes 8a, 8b to the polarization voltage between the workpiece and the anode, and the plating between the workpiece and the anode during plating. Although the voltage is lower than the voltage, it is preferable that the voltage be as low as possible within the range.

  As the uninterruptible power supply 11, it is possible to use a conventional one that is generally used, and in particular, when an inverter power supply type is always used and an emergency power supply such as a generator is provided, Since power is always supplied from the three systems of the power source, the secondary battery, and the emergency power source, the power supply stability is very good. However, the constant inverter power supply type always has a problem of large loss during steady operation because all power is always supplied from the inverter. FIG. 2 shows a configuration of an uninterruptible power supply suitable for use in the plating apparatus having the power failure compensation function of the present invention without such a problem. The uninterruptible power supply 11 is configured as described above. This is the invention of claim 4.

  FIG. 2 is a connection diagram of the main circuit, in which a commercial power input terminal 12 to which a commercial power is connected and an emergency power input terminal 13 to which an emergency power is connected are provided. The commercial power input terminal 12 is connected to the input side of the semiconductor switch 16 via the first breaker 14 and the first switch 15, and the emergency power input terminal 13 is connected to the second breaker 17 and the second breaker 17. It is connected to the input side of the semiconductor switch 16 via the switch 18. Here, the commercial power input terminal 12 and the first breaker 14 constitute a commercial power input part, and the emergency power input terminal 13 and the second breaker 17 constitute an emergency power input part. The output side of the semiconductor switch 16 is connected to an output terminal 19 that is an output unit, and the AC side of the converter 22 is connected to the output terminal 19 via a third breaker 20 and a reactor 21.

  The converter 22 is a bidirectional one that operates as both a converter and an inverter, and its main circuit is configured by bridging semiconductor elements such as IGBTs in the same manner as a conventionally known converter. When converter 22 operates as a converter, AC power input to the AC side is converted to DC and supplied to the DC side, and when operated as an inverter, DC power supplied from the DC side is converted to AC and AC is converted. Supply to the side. The DC side of the converter 22 is connected to one input / output terminal of a capacitor 23 and a bidirectional chopper 24, and an energy storage element 25 such as a secondary battery is connected to the other input / output terminal of the chopper 24. It is.

  The chopper 24 steps down the DC power supplied from the converter 22 at one input / output terminal and stores the DC power in the energy storage element 25 connected to the other input / output terminal, or the energy storage element 25. It operates as a boost chopper that boosts the stored DC power and supplies it to the converter 22. In the figure, 26 is a third switch connected in parallel with the semiconductor switch 16, and 27 is a reactor inserted between the chopper 24 and the energy storage element 25. Note that the first breaker 14, the second breaker 17, and the third breaker 20 are provided for circuit protection and are not directly related to the function and operation of the apparatus.

  The first switch 15, the semiconductor switch 16, the second switch 18, and the third switch 26 are each opened and closed by a control device (not shown). The converter 22 and the chopper 24 are also controlled by a control device (not shown) in accordance with the switching control of each switch. Thereby, when the converter 22 operates as a converter, the converter 22 is controlled so as to hold the DC side at a constant voltage and compensate for harmonic components of the AC circuit, and when operating as an inverter, the converter 22 operates in a self-sustaining operation mode or frequency. Control is performed in one of synchronous modes for synchronizing phase and voltage. When the chopper 24 operates as a step-down chopper, the charging current and the charging voltage of the energy storage element 25 are controlled to be appropriate. When the chopper 24 operates as a step-up chopper, an appropriate voltage is applied to the converter 22 that operates as an inverter. It is controlled so that it can be supplied. In order to perform such control, a sensor that detects voltage and current and takes in the control device is provided at a necessary location.

  FIG. 3 shows the configuration of the invention of claim 3. The configuration shown in FIG. 1 is different from that shown in FIG. 1 in that an emergency power input terminal 28, a steady-state switch 29, and an emergency switch 30 are provided. Is different. During normal operation, the steady-state switch 29 is closed to supply power from the commercial power input terminal 10 to the plating DC power supply devices 1a and 1b. In the event of a power failure, the emergency switch 30 is closed and plating is performed. Electric power from the emergency power input terminal 28 is supplied to the direct current power supply devices 1a and 1b. When the uninterruptible power supply 11 includes an emergency power input terminal, the emergency power input terminal is connected to the emergency power input terminal 28. A general emergency power supply device such as a generator driven by a diesel engine can be used as the emergency power supply device, but a power supply that can be operated and stopped by a signal transmitted from the uninterruptible power supply 11 is preferable. .

  When power is normally supplied to the commercial power input terminal 10, the power of the commercial power is supplied to the plating DC power supply devices 1a and 1b by the drivers 3a, 3b and 3c, the switches 5a and 5b, the control device 6 and the compensation. The DC power supply devices 9a and 9b are supplied with power from the uninterruptible power supply device 11, and the operation is normally performed when the operation of the plating apparatus is started. The uninterruptible power supply 11 is also supplied with commercial power, and DC power is stored in the built-in energy storage element. The direct current power supply devices 1a and 1b for plating are operated and stopped by a signal given from the control device 6 in accordance with the entrance and exit of the workpiece into the plating tanks 7a and 7b of the workpiece by the conveying device. Is supplied.

  At this time, the compensation DC power supply devices 9a and 9b are also operated and stopped simultaneously with the plating DC power supply devices 1a and 1b by a signal given from the control device 6, but the output voltages of the compensation DC power supply devices 9a and 9b are for plating. Since it is lower than the DC power supply devices 1a and 1b, all the plating current is supplied from the plating DC power supply devices 1a and 1b. Further, since the diodes 8a and 8b are provided, the output voltage of the plating DC power supply devices 1a and 1b is not applied to the output side of the compensating DC power supply devices 9a and 9b, and the feedback of the compensating DC power supply devices 9a and 9b. The system is not affected by the outputs of the plating DC power supply devices 1a and 1b. As a result, the compensating DC power supply devices 9a and 9b are operated in a no-load state in which the set voltage is output.

  When a power failure occurs, the plating current supplied from the plating DC power supply devices 1a and 1b is cut off, but the compensation DC power supply devices 9a and 9b receive power from the uninterruptible power supply device 11. A voltage is applied between the workpiece and the anode from the compensating DC power supply devices 9a and 9b via the diodes 8a and 8b. The output voltage of the compensation DC power supply devices 9a and 9b exceeds the polarization voltage between the workpiece and the anode plus the voltage drop of the diodes 8a and 8b, and the polarization voltage is between the workpiece and the anode. Since the above voltage is applied, no reverse current flows through the plated surface. As a result, even if the plating is continued by the plating current supplied from the plating DC power supply devices 1a and 1b after the power failure is restored, the parts are not peeled off.

  The output voltage of the compensating DC power supply devices 9a and 9b is preferably as low as possible within a range exceeding the voltage necessary for applying a voltage higher than the polarization voltage between the workpiece and the anode, and the voltage is lowered. As a result, both the current flowing through and the power are reduced, and the compensating DC power supply devices 9a and 9b may be of a small capacity. In the state where power is supplied from the compensating DC power supply devices 9a and 9b, the current is small and the plating film hardly grows. Therefore, it is not appropriate to transport the workpiece next without the plating film growing sufficiently. For this reason, the control device 6 sends drivers 3a3b and 3c signals so as to temporarily stop the conveyance of the workpiece when the workpiece being conveyed is lowered, and the motors 4a and 4b for driving the necessary filter, circulation pump and the like are operated. Will continue.

  Since the power supplied from the compensation DC power supply devices 9a and 9b is small, the input power to the compensation DC power supply devices 9a and 9b is also small. Is limited as an object of compensation, the electric power can be supplied only by the electric power stored in the energy storage element built in the uninterruptible power supply 11, and the energy storage element does not need to have a large capacity. When the instantaneous interruption is restored, the remaining time of plating is performed to complete the product, and the plating apparatus returns to a normal operation state. If the emergency power supply device is provided as the configuration of the invention of claim 3, the steady state switch 29 is opened and the emergency switch 30 is closed, whereby the plating direct current power supply devices 1a and 1b are switched from the emergency power supply. Therefore, even if a power failure occurs for a long time, plating can be continued.

  When the uninterruptible power supply 11 having the configuration shown in FIG. 2 is used, the first breaker 14, the second breaker 17, and the third breaker 20 are turned on before the uninterruptible power supply 11 is started. The state is made operable and the steady state switch 29 is closed. As a result, power is supplied from the commercial power source to the plating DC power supply devices 1a and 1b. When power is normally supplied to the commercial power supply input terminal 10, when the operation of the plating apparatus is started, the first switch 15 and the third switch 26 are closed by the controller of the uninterruptible power supply 11, Electric power is supplied from a commercial power source to the compensation DC power supply devices 9a, 9b and the like. Subsequently, the semiconductor switch 16 is closed and the third switch 26 is opened.

  As a result, the starting current of the compensating DC power supply devices 9a, 9b, etc. flows through the third switch 26, and thereafter, power is continuously supplied from the commercial power supply to the compensating DC power supply devices 9a, 9b, etc. through the semiconductor switch 16. . In this state, the converter 22 operates as a converter, and is controlled so as to charge the DC-side capacitor 23 and supply a constant voltage of DC power to the chopper 24. The chopper 24 steps down the DC power supplied from the converter 22 and charges the energy storage element 25. At this time, if necessary, the converter 22 can be operated to compensate for the harmonic component of the AC circuit.

  When a power failure occurs, the converter 22 that has been detected as a sensor and operated as a converter immediately operates as an inverter and is controlled to operate independently. Further, the chopper 24 that has been operating as the step-down chopper is controlled so as to supply the power of the energy storage element 25 to the converter 22 as a step-up chopper. At the same time, the semiconductor switch 16 is opened to prevent a reverse power flow toward the commercial power source, and then the first switch 15 is opened. The converter 22 has been operating in synchronism with the commercial power supply so far, and can be shifted to a state where it can operate independently as an inverter within a very short time such as several milliseconds. Thereby, the interruption of the power supply to the loads such as the compensating DC power supply devices 9a and 9b does not cause a problem. In this state, the DC power stored in the energy storage element 25 is converted into AC power by the converter 22 and supplied to the load. When the power failure time is short as described above, It is possible to cover the power in the meantime with only the stored power.

  In order to be able to cope with a power outage for a long time, an emergency power supply device is provided as the configuration of the invention of claim 3, and the emergency power supply device is activated when the power failure time is expected to be long. . Since many emergency power supply devices require about 40 seconds to start up, the energy storage element 25 needs to store enough power to be supplied during that time. When the emergency power supply is started up, the converter 22 that has been controlled in the self-sustaining operation mode is controlled in the synchronous mode, and the frequency, phase, and voltage of the output of the converter 22 are adjusted to those of the emergency power supply. Two switches 18 are closed. When the synchronization between the output of the emergency power supply and the output of the converter 22 is within a predetermined range, the converter 22 is stopped, and at the same time, the semiconductor switch 16 is closed and the compensation DC power supply devices 9a, 9b, etc. Power is supplied to the load from an emergency power source.

  Next, when the steady state switch 29 is opened and the emergency switch 30 is closed, power is supplied from the emergency power source to the plating DC power supply devices 1a and 1b, and a predetermined plating current can be supplied. Therefore, the plating apparatus can continue normal operation. Thereafter, when the third switch 26 is closed, the current flowing through the semiconductor switch 16 flows into the third switch 26 and the loss of the semiconductor switch 16 is reduced. The converter 22 operates again as a converter, and DC power is stored in the energy storage element 25 via the chopper 24.

  When the commercial power supply is restored while the power is supplied from the emergency power supply in this way, the third switch 26 is opened and the semiconductor switch 16 is closed by the control device. The converter 22 operating as a converter is controlled to operate independently as an inverter, and the chopper 24 operating as a step-down chopper supplies power to the converter 22 from the energy storage element 25 as a step-up chopper. Be controlled. At the same time, the semiconductor switch 16 is opened to prevent reverse power flow to the emergency power supply side. Thereafter, the second switch 18 is opened, and the emergency power supply is stopped.

  Thereafter, the converter 22 that has been controlled in the self-sustaining operation mode is controlled in the synchronous mode, and the frequency, phase, and voltage of the output of the converter 22 are adjusted to those of the commercial power source, during which the first switch 15 is closed. Is done. When the synchronization between the commercial power supply and the output of the converter 22 matches within a predetermined range, the converter 22 is stopped and the semiconductor switch 16 is closed at the same time, and the load such as the compensating DC power supply 9a, 9b is not loaded. Power is supplied from a commercial power source. Thereafter, converter 22 is activated again as a converter, and the uninterruptible power supply returns to a steady operation state in which DC power is stored in energy storage element 25 via chopper 24. If the emergency switch 30 is opened and the steady switch 29 is closed, power is supplied from the commercial power source to the plating DC power supply devices 1a and 1b, and the normal operation state is obtained. Even when switching to the commercial power supply, power supply from the plating DC power supply devices 1a and 1b is interrupted. However, since power is supplied from the compensation DC power supply devices 9a and 9b, there is no problem in plating quality.

  As described above, according to the present invention, the compensation DC power supply devices 9a and 9b are provided, and the outputs of the compensation DC power supply devices 9a and 9b are supplied to the plating DC power supply devices 1a and 1b via the diodes 8a and 8b. Since the power is supplied from the uninterruptible power supply 11 to the conveying device and the compensating DC power supply devices 9a and 9b, the power supply is connected between the workpiece and the anode even during a power failure. A voltage is not applied from the compensating DC power supply devices 9a and 9b to eliminate the voltage, and the conveying device does not stop. Since the voltage applied between the workpiece and the anode is higher than the polarization voltage, the reverse current does not flow on the plating surface. is there. Since the diodes 8a and 8b are provided at the outputs of the compensating DC power supply devices 9a and 9b, the feedback system of the compensating DC power supply devices 9a and 9b is affected by the outputs of the plating DC power supply devices 1a and 1b. Absent.

  Further, since the output voltage of the compensating DC power supply devices 9a and 9b is lower than the normal plating voltage, the flowing current is also reduced, and the compensating DC power supply devices 9a and 9b can be of a small capacity and can be uninterrupted. There is an advantage that the power supply device 11 may have a small capacity. If the object of compensation is limited to momentary power interruption, the energy storage element incorporated in the uninterruptible power supply 11 may be of a small capacity, and an electric double layer capacitor or the like can be used. There is an advantage that the maintenance is not required and the reliability is increased. Furthermore, according to the invention of claim 3, since power can be supplied from the emergency power supply to the plating DC power supply devices 1a and 1b even during a long power failure, there is an advantage that plating can be continued. According to the invention, since the commercial power source is used as it is without passing through the inverter in the steady state, there is an advantage that the efficiency in the steady state is good.

  According to the fourth aspect of the present invention, the energy storage element 25 only needs to store energy only during the rise of the emergency power supply device at the longest, so that it has a small capacity, and an electric double layer capacitor or the like can be used. According to the invention of claim 5, since the starting current flows through the third switch 26 provided in parallel with the semiconductor switch 16 even when the starting current of the compensation DC power supply devices 9a, 9b, etc. is large, the semiconductor The switch 16 need not have a particularly large current capacity. Thus, according to the invention of claim 3, plating can be continued even if the commercial power supply fails. However, it is possible to continue plating from the viewpoint of the fuel storage amount of the emergency power supply, the operating cost and the like. It is possible that this is not a good idea. In such a case, it is needless to say that the plating apparatus can be stopped by canceling the new input of the workpiece.

It is a connection diagram which shows the structure of this invention. It is a connection diagram which shows an example of an uninterruptible power supply. It is a connection diagram which shows the structure of invention of Claim 3.

Explanation of symbols

1a, 1b Plating DC power supply device 2a, 2b, 2c Electric motor 3a, 3b, 3c Driver 4a, 4b Electric motor 5a, 5b Switch 6 Controller 7a, 7b Plating tank 8a, 8b Diode DC 9a, 9b Compensating DC power supply device 10 Commercial power input terminal 11 Uninterruptible power supply 12 Commercial power input terminal 13 Emergency power input terminal 14 First breaker 15 First switch 16 Semiconductor switch 17 Second breaker 18 Second switch 19 Output terminal 20 Third breaker 21 Reactor 22 Converter 23 Capacitor 24 Chopper 25 Energy storage element 26 Third switch 27 Reactor 28 Emergency power supply input terminal 29 Constant-time switch 30 Emergency switch

Claims (5)

  Consists of a transport device that transports workpieces, a plating DC power supply device, a compensation DC power supply device, and an uninterruptible power supply device. The output of the compensation DC power supply device is the output of the plating DC power supply device via a diode. A plating apparatus having a power failure compensation function, characterized in that power is supplied from the uninterruptible power supply device to the transport device and the compensation DC power supply device in parallel.   The output voltage of the compensation DC power supply is higher than the voltage obtained by adding the voltage drop of the diode to the polarization voltage between the workpiece and the anode, and less than the plating voltage between the workpiece and the anode during plating. The plating apparatus provided with the power failure compensation function according to claim 1.   A switch is provided between the AC input side of the DC power supply device for plating and the commercial power supply and the emergency power supply, and either one of the switches is selectively closed to either the commercial power supply or the emergency power supply. The plating apparatus having a power failure compensation function according to claim 1 or 2, wherein power is supplied to the direct current power supply apparatus for plating.   The uninterruptible power supply is composed of two input units connected to a commercial power source and an emergency power source, an output unit connected to a load, a semiconductor switch, a bidirectional converter, and an energy storage element. The two input parts are connected to one pole of a semiconductor switch through a switch that is selectively closed, the other pole of the semiconductor switch is connected to an output part, and bidirectional to the output part. Connect the AC side of the converter and connect the energy storage element to the DC side of the converter. During steady operation, control the converter to operate the converter and store DC power in the energy storage element. Means for controlling the converter so that the DC power stored in the energy storage element is converted into AC power by inverter operation when switching from the emergency power supply to the emergency power supply and when switching from the emergency power supply to the commercial power supply Claims 1, characterized in that the one provided to a plating apparatus provided with a power failure compensation function according to any one of 3.   5. The power failure compensation function according to claim 4, wherein a switch is provided in parallel with the semiconductor switch constituting the uninterruptible power supply, and control means is provided for controlling the switch to be closed at the start. Equipped with plating equipment.

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