JP2007014167A - Plating power supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a plating power supply device that allows an AC power supply to safely cope with two voltages of a high-voltage system and a low-voltage system, is easy in operation by displaying a received abnormal voltage, and reduced in weight. <P>SOLUTION: A power supply main circuit 1 is constituted of first and second smoothing capacitors that receive alternate currents and are connected to the output side of an input rectifying circuit to be connected, an inverter, a high-frequency transformer, and an output rectifying circuit. The power supply main circuit also comprises a means that switches the connection/release of a series connecting point of the first and second capacitors so as to correspond to a power receiving voltage system, so that a prescribed DC voltage is fed to the input end of the inverter, and a panel operation/display means 6 that displays the adaptability/non-adaptability of the received voltage, and displays a set key operation instruction in the vicinity of the former display. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to handling of different input voltages of a power supply device for plating.

  As an example of disclosure of similar technology, a technology of a power supply apparatus in which an AC power supply is a high voltage system (for example, 200V) and a low voltage system (for example, 100V) corresponding to a two-voltage power supply apparatus so as not to break down due to a received different voltage. In relation to this, the following Patent Document 1 describes the correspondence to the input voltage of the welding machine power supply.

  Patent Document 1 (paragraph 0008) states that "the input switch that opens and closes the AC power supply, the input rectifier that rectifies the AC power supply via the switch, and the main switch that switches in series and parallel to the output side of the input rectifier. Two smoothing capacitors that are freely connected and initially set in a series connection corresponding to a high-voltage AC power source when the input switch is turned on and closed, and a direct current between the positive and negative electrodes of both smoothing capacitors Two inverters with a semiconductor switch element configuration that outputs high-frequency alternating current by operating in accordance with the above, an output transformer to which the outputs of both inverters are supplied, and two primary feeders through the input switch by the control switch A control power transformer that is switchably connected in series and in parallel to the AC power source, and in which both primary power lines are initially set to a serial connection corresponding to a high-voltage AC power source at the time of start-up, and a secondary power line of this transformer A DC converter that rectifies and smoothes the force to generate a DC control voltage, and operates a main switch and a control switch when a voltage lower than a predetermined voltage is generated as a control voltage by turning on the input switch, A smoothing capacitor, a connection switching circuit for switching and holding both primary windings in parallel connection corresponding to a low-voltage AC power source that is about half the voltage of a high-voltage AC power source, a main switch, and a control switch When the control voltage rises to a voltage higher than a predetermined voltage after the operation, the power switch circuit is provided to open the input switch. ”When the input is shut off by the power shut-off circuit This power supply device is not suitable for plating because an object to be plated in the process becomes poor in quality. In the case of a power supply device having a small output capacity, the two inverters and the output transformer to which the outputs of both the inverters are supplied have been uneconomical because it obstructs the reduction in weight and size.

"JP-A-8-71749", "Arc equipment power supply"

  In the power supply used for plating, when a new plating facility is installed, the power supply device is connected from the power receiving facility such as a single-phase 100V, single-phase 200V, three-phase 200V, three-phase 400V, etc. If it is selected from the inside, it will be used for many years. It is not the actual usage in which the received voltage to which the welding power supply device is connected changes every time the welding work site changes as in the case of a welding machine. If the power receiving voltage at the installation location is determined to be single-phase or three-phase when manufacturing the plating power supply device, it can be handled with a standard model that can be delivered immediately without requiring a single product to be designed and manufactured according to the power receiving voltage. There is an aim to provide.

  The present invention has a simplified configuration and an input voltage specification that can safely handle a two-voltage system. The display means that guides the compatibility / non-conformity of the received voltage and the operation command prevents the device from being burned by the operation, and the operability An object of the present invention is to provide a power supply device for plating which is improved in weight and reduced in weight.

  The present invention relates to an input rectifier circuit for rectifying an alternating current received at an input terminal, first and second smoothing capacitors connected to an output side of the input rectifier circuit, an inverter formed of a semiconductor switching element, a high frequency In the power supply main circuit composed of a transformer, an output rectifier circuit, and a receiving voltage detector, an input is made so that the voltage on the input side of the inverter is substantially constant corresponding to the receiving voltage system detected by the receiving voltage detector. It has switching means that can be switched between connecting / opening the input side connection point of the rectifier circuit to the series connection point of the first and second smoothing capacitors, and displays the command to set or operate the received voltage and set key operation The plating power supply device is characterized by comprising an operation panel unit (panel operation / display means).

  With respect to claim 2, in order to make the DC voltage on the input side of the inverter substantially constant corresponding to two types of power reception voltage systems, full-wave rectification is performed when the AC power reception voltage is a high voltage system (for example, 200 V). In the case of an AC power source of low voltage system (for example, 100V), a switching means is provided at the connection point to the input rectifier circuit so that the voltage is rectified to approximately twice the voltage and supplied to the inverter. By connecting them, the output voltage of the input rectifier circuit is kept substantially constant with respect to the two-voltage power reception. In addition, in the case of a low voltage system (for example, 100V) AC power source, the rectifying elements constituting the arms of the input rectifier circuit are connected in parallel by the switching means so that the current load flowing through the rectifier elements does not become excessive.

  According to a third aspect of the present invention, when the switching means receives a high-voltage system (for example, 200V), the full-wave rectification bridge circuit is substantially half-bridged. A double voltage generating rectifier circuit / full-wave rectifier bridge circuit by enabling connection / opening between the midpoint of one half-bridge circuit and the series connection point of the first and second smoothing capacitors so as to form a circuit By switching the connection means to the connection point to the input rectifier circuit via the switching means, the output voltage is supplied to the inverter while keeping the output voltage substantially constant with respect to a change of about twice the received voltage. The power supply device for plating has a means to perform the above.

  With respect to the fourth aspect, the input rectifier circuit connected by receiving one of the voltages of the two-voltage system AC, the first and second smoothing capacitors connected to the output side of the input rectifier circuit, the first and second In a power supply main circuit composed of two inverters, first and second high-frequency transformers, and first and second output rectifier circuits, a predetermined DC voltage is fed to each input terminal of the first and second inverters. As shown, it comprises switching means for switching the first and second smoothing capacitors corresponding to the receiving voltage system between the case of series connection and the case of parallel connection, and the output side of the output rectifier circuit is connected in parallel, An operation panel unit that includes means for supplying the load with the output voltage kept substantially constant against a change of approximately one to two of the AC received voltage, and that displays a command for setting / operating the received AC voltage and setting key operation. A power supply device for plating having

  The operation panel unit as the panel operation / display means is an operation panel unit including a display means, a command input means, and a control circuit including a CPU for the operation panel. The power supply device for plating has a configuration with improved operability so that it can be connected to the casing and moved closer to or away from the installation position of the casing, or the mounting position can be freely selected at a bright position.

  In order not to break down due to the received different voltage, it is possible to respond promptly to diversification of input voltage. In order to improve the operability to deal with different voltages and to provide a standard plating power supply device that can be shared with various receiving voltage systems at a low cost, from the standard design and production of each conventional order, Since a technical solution that can be switched to mass production has been obtained, the ability to produce medium quantities with standard products can be provided with reduced equipment costs.

An embodiment according to the present invention is shown in FIG. The power unit 5 is composed of the power supply main circuit 1 and the control unit 2, and is formed of the power unit 5 and the operation panel unit (panel operation / display means) 6 to provide a plating power supply device with improved operability. . The control unit 2 is formed by an error amplifier 3 and a drive signal generator 4. The power supply main circuit 1 includes an input terminal 10, an input rectifier circuit 12 that rectifies received AC, an inverter 13 connected to the output side of the input rectifier circuit 12, and a high-frequency transformer 14 connected to the output side of the inverter. The output rectifier circuit 15 connected to the output side of the high-frequency transformer 14, the output voltage detector 16, the output current detector 17, the received voltage detector 18, the output terminal 19, and the first means connected to the switching means 11. A smoothing capacitor 20 and a second smoothing capacitor 21 are formed. The operation panel unit (panel operation / display means) 6 is formed by an operation panel control circuit 9 including a display means 7, a command input means 8, and an operation panel CPU. As displayed on the display means 7, an input key (a SET key described later) of the command input means 8 is operated, and the connection is changed by the switching means 11 as will be described later with reference to FIGS. This prevents failures due to different voltages.

  In order to make the DC voltage on the input side of the inverter 13 substantially constant despite the different voltage ratio of the receiving voltage system being 1: 2, the input rectifier circuit 12 is fully connected in the case of AC power receiving in a high voltage system (for example, 200V system). Acts as a wave rectifier circuit, is converted to a direct current and supplied to the inverter 13, and in the case of a low voltage system (for example, 100 V system) alternating current, the input rectifier circuit 12 acts as a double voltage generator circuit and is converted to a direct current As shown in FIG. 13, the voltage on the input side of the inverter 13 can be kept substantially constant by connecting to the connection point to the input rectifier circuit via the switching means 11. In this way, a power supply device for plating with improved operability for preventing failure due to different voltages was obtained.

A second embodiment according to the present invention is shown in FIG. The power unit 5 is composed of a power source main circuit and the control unit 2, and is formed by the power unit 5 and the operation panel unit (panel operation / display means) 6 to provide a plating power source device with improved operability. . The control unit 2 is formed by an error amplifier 3 and a drive signal generator 4. The power supply main circuit includes an input terminal 10, an input rectifier circuit 12 that rectifies received AC, a first inverter 13 connected to the output side of the input rectifier circuit 12, a second inverter 23, and an output side of the inverter The first high-frequency transformer 14 and the second high-frequency transformer 24 connected to each other, the first output rectifier circuit 15 connected to the output side of the high-frequency transformers 14 and 24, the second output rectifier circuit 25, and the output voltage detection 16, output current detector 17, received voltage detector 18, output terminal 19, first smoothing capacitor 20 connected to switching means 11, and second smoothing capacitor 21.
The operation panel unit (panel operation / display means) 6 is formed by an operation panel control circuit 9 including a display means 7, a command input means 8, and an operation panel CPU. As displayed on the display means 7, an input key (a SET key described later) of the command input means 8 is operated to change the connection by the switching means 11 as will be described later with reference to FIG.

Examples of circuit diagrams of the switching means 11 are shown in FIG. 3, FIG. 4, and FIG.
FIG. 3 shows the switching means of the first embodiment. When the AC power receiving power source receives a high voltage system (200 V) at the input terminal 10, the normally open contact 31a is turned off. A wave rectifier circuit is formed, and the output side thereof is connected to both ends 20a and 21b of a series connection body of the smoothing capacitor 20 and the smoothing capacitor 21 to supply a DC voltage of about 280V (200V peak value). Next, when the AC receiving power source is a low voltage system (100V) power source, the SET key is pushed according to the operation instruction of the display panel, and the normally open contact 31a is turned on. As a result, the input rectifier circuit 12 is switched to the voltage doubler rectifier circuit. The rectifier circuit in which the midpoint of one rectifier element arm of the input rectifier circuit 12 and the connection point (midpoint) of the series connection body of the smoothing capacitor 20 and the smoothing capacitor 21 are connected is 280V, which doubles the output voltage. Is a circuit known as a voltage doubler rectifier circuit that outputs to the relay, but pushes the SET key 26 in accordance with the operation instruction of the panel operation / display means 6 to energize the relay coil 31, and the normally open contact 31a is turned on. By doing so, a voltage doubler rectifier circuit is formed, and the voltage detected by the power receiving voltage detector 18 indicates conformity / non-conformity in the two voltage system, and an operation instruction is displayed in the vicinity of this display so that there is no error. It is a new idea that the necessary functions are realized by constituting with a small number of lightweight components while improving the operability.

  FIG. 4 shows an improvement of the circuit of the switching means 11 of the first embodiment. When the input rectifier circuit 12 is switched to a voltage doubler rectifier circuit, the power supply apparatus receives a low voltage system (for example, 100 V system). The objective was to improve the overall output capacity. The method is such that when the connection point P between the third rectifier element 12c and the fourth rectifier element 12d is connected to the series connection point N of the first and second smoothing capacitors 20, 21 and acts as a voltage doubler rectifier circuit, Utilizing the third and fourth rectifier elements, which were previously in a non-energized state, in order to prevent an excessive burden per rectifier element even when the output of the device is increased by energization. Each rectifier element is formed to be a circuit connected in parallel. Using the normally open contact (relay make contact) of the switching means 42a and 43a and the normally closed contact (relay break contact) of the switching means 42b and 43b, the third rectifier element 12c and the fourth rectifier 12d The output was increased by the effective use of the elements, and the economics of this power supply were improved.

  When the AC receiving power source is a low voltage system (100V) power source, the SET key is pushed according to the operation instruction of the display panel, and the normally open contact 41a is turned on. As a result, the input rectifier circuit 12 is switched to the voltage doubler rectifier circuit. The rectifier circuit, in which the midpoint P of one rectifier element arm of the input rectifier circuit 12 and the series connection point (midpoint) N of the smoothing capacitor 20 and the smoothing capacitor 21 are connected, outputs the output voltage to the input voltage peak value. This is a circuit known as a voltage doubler rectifier circuit that outputs to 280V, which is twice as large as the above, but it is an improvement that makes it possible to increase the current load economically. The rectifying elements 12c and 12d required for the voltage doubler rectifier circuit are switched to parallel connection and act to double the current load withstand so that the output is not reduced when receiving a low voltage system. It is an idea.

  FIG. 5 is an example of a circuit diagram of the switching means in the second embodiment. When the AC power receiving power source is a low voltage system (200V) power source, the normally closed contacts 33a and 33c are turned on and the normally opened contact 33b is turned off. The smoothing capacitor 20 and the smoothing capacitor 21 are connected in parallel. Next, when the AC power receiving power source is a high voltage system (400V) power source, the SET key 26 is PUSHed according to the instruction of the panel operation / display means 6, the normally closed contacts 33 a and 33 c are turned off, and the normally opened contact 33 b is turned on. As a result, the first smoothing capacitor 20 and the second smoothing capacitor 21 are connected in series, the effective value 400V is rectified at both ends, and the peak value is applied.

  As shown in the flow of FIG. 6 as a display method with good operability in this manner, when an operation instruction is displayed near the blinking display and the switching means is operated with the SET key as instructed, the AC receiving voltage becomes high. In the case of the voltage system, the normally closed contacts 33a and 33c of the switching means are turned off, the normally open contact 33b is turned on and the smoothing capacitors 20 and 21 are connected in series, and the START / STOP in the operation panel unit 6 is connected. You can start driving with the key. In the case of the low voltage system, the normally closed contacts 33a and 33c are turned on, and the smoothing capacitors 20 and 21 are connected in parallel to stand by for operation, and the operation can be started with the START / STOP key. The switching circuit between the series connection and the parallel connection is a well-known circuit, but the SET key 26 is pushed by the operation instruction of the panel operation / display means 6 to energize the relay 33, and the normally open contact 33b is turned on. In this way, the function is realized with a small number of simple and lightweight components that are connected to each other so that a series connection of capacitors is formed and an operation instruction is displayed in the vicinity of the blinking display so that it can be operated without error. Is the idea.

  Therefore, the cascade connection circuit of the first smoothing capacitor 20 and the first inverter 13 and the cascade connection circuit of the second smoothing capacitor 21 and the second inverter 23 are connected in parallel on the output side of the last stage. When the AC power receiving power source is a high voltage system, the smoothing capacitors 20 and 21 are connected in series. In the case of a low-voltage system, the circuit is switched so that the smoothing capacitors 20 and 21 are connected in parallel, and the voltage per capacitor becomes substantially equal, effectively and appropriately withstand voltage of the power supply device internal member. It is switched and connected corresponding to the change of the receiving voltage ratio 1 to 2.

  The display and operation flow of the operation panel unit 6 remote from the power supply device according to the embodiment of the present invention or the operation panel unit 6 disposed on the front surface of the apparatus housing will be described with reference to FIGS. The operation of the power supply apparatus shown in FIG. 1 and FIG. 2 is intended to cope with the power supply apparatus so that it does not break down due to the higher receiving voltage system to be connected. FIG. 6 shows the case of the first embodiment. When the connected AC effective value voltage is lower than 120V (S1) or when the determination is Y (low, ie, 100V system), the display is 100V blinking (S2) and PUSH. (Instructed to press the set key near the 100V blinking display) When PUSH (3S), the relay in the device is turned on (S4), the device is switched to double voltage rectification, (S5) the display is SET, Good, You can start driving as it is. On the other hand, when the connected AC voltage is lower than 120V (S1) or when the judgment is N (higher, ie, 200V system), the display is SET, Good (S6), the operation is left as it is (not switched) (7S), the operation it can.

  FIG. 7 shows the display and flow in the case of the second embodiment, which is a case of AC 200V system and 400V system power reception. It is determined whether the power reception voltage is higher or lower than 240V (standard voltage in the apparatus), for example (S1). ) When it is high (determination Y), the display blinks 400V (S2) and PUSH is displayed in the vicinity thereof. When the PUSH operation is performed (3S), the relay in the apparatus is turned on (S4), the smoothing capacitor is switched to the serial connection in the apparatus (S5), the display is SET, Good, and the operation can be started as it is. When it is low (determination N) (S1), the initial setting value in the apparatus is maintained and power is supplied to the plating tank. For example, when the power receiving voltage system is higher or lower than 240 V (standard voltage in the apparatus) (S1) and the operation instruction PUSH is displayed in the vicinity of the blinking display, the power supply apparatus is operated until the PUSH operation is performed. The main circuit is not energized and stands by without fear of failure.

  As described above, a technical solution that can easily meet the diversification of input voltages, can be configured to meet the requirements with fewer components, and can be switched to support input voltages without risk of damage to the equipment due to misoperation. As a result, the production delivery time can be shortened by deleting one-time design man-hours.

  The rationalization of plating processing costs is important for business operators. As the quality standards for plating become more delicate, equipment improvements and timely expansion are increasingly required, and the power supply voltage system has excellent applicability in a wide range. The enhancement of equipment by this inexpensive device that can shorten the production period has a high contribution to the user and has great industrial value.

It is a block diagram which shows 1st Embodiment by this invention. It is a block diagram which shows 2nd Embodiment by this invention. It is a circuit diagram which shows the principal part of 1st Embodiment. It is a circuit diagram which shows the principal part of 1st Embodiment. It is a circuit diagram which shows the principal part of 2nd Embodiment. It is a flowchart of a display and operation of a 1st embodiment. It is a flowchart of a display and operation of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power supply main circuit 2 Control part 3 Error amplifier 4 Drive signal generator 5 Power unit 6 Control panel unit (panel operation and display means)
7 Display means 8 Command input means 9 Operation panel control circuit (including operation panel CPU)
DESCRIPTION OF SYMBOLS 10 Input terminal 11 Switching means 12 Input rectifier circuit 12a 1st rectifier element 12b 2nd rectifier element 12c 3rd rectifier element 12d 4th rectifier element 13 1st inverter 14 1st high frequency transformer 15 1st output rectifier circuit 16 Output Voltage detector 17 Output current detector 18 Receiving voltage detector 19 Output terminal
20 first smoothing capacitor 21 second smoothing capacitor 23 second inverter 24 second high-frequency transformer 25 second output rectifier circuit 26 SET key 31 switching means (relay coil)
31a Normally open contact of switching means (relay make contact)
33 Switching means (relay coil)
33a Normally closed contact of switching means (relay break contact)
33b Normally open contact of switching means (relay make contact)
33c Normally closed contact of switching means (relay break contact)
41 Switching means (relay coil)
41a Normally open contact of switching means (relay make contact)
42a Normally-open contact of switching means (make contact of relay)
43a Normally open contact of switching means (relay make contact)
42b Normally closed contact of switching means (relay break contact)
43b Normally closed contact of switching means (relay break contact)
P Half-bridge circuit midpoint (input-side connection point of input rectifier circuit)
N Series connection point of the first and second smoothing capacitors

Claims (5)

An input rectifier circuit connected to an input terminal for receiving a two-voltage AC voltage; first and second smoothing capacitors connected to an output side of the input rectifier circuit; an inverter formed of a semiconductor switching element; a high-frequency transformer; In the power supply main circuit composed of the output rectifier circuit and the received voltage detector, the input rectifier circuit is set so that the voltage on the input side of the inverter is substantially constant corresponding to the received voltage system detected by the received voltage detector. The switch has a switching means that can be switched between connecting / opening the input side connection point to the series connection point of the first and second smoothing capacitors, and displaying the command for setting or not operating the received voltage and setting key operation A plating power supply device comprising a panel unit (panel operation / display means).
In the case of a low-voltage AC power supply, the switching means switches / connects the rectifying element that constitutes each arm of the input rectifier circuit to a parallel connection, and connects / opens the input rectifier circuit to the series connection point of the smoothing capacitor. The power supply device for plating according to claim 1, which is a switchable switching means.
When the switching means is a high voltage system (for example, 200V) power reception, the full wave rectification bridge circuit is a half bridge circuit so that the full wave rectification bridge circuit is a half bridge circuit. A switching means that can be connected / opened at the midpoint of the bridge circuit and the series connection point of the first and second smoothing capacitors and can be selectively used between the double voltage generation rectifier circuit and the full-wave rectifier bridge circuit. 2. A means for supplying an output voltage to an inverter while maintaining a substantially constant change with respect to a change of about twice the received voltage by connecting to a connection point to a rectifier circuit through a switching means. The power supply device for plating according to 1 or 2.
An input rectifier circuit that is connected by receiving one of two voltage system alternating currents, first and second smoothing capacitors connected to the output side of the input rectifier circuit, first and second inverters, first And a second high-frequency transformer, and a first main power circuit composed of first and second output rectifier circuits, so that a predetermined DC voltage is fed to each input terminal of the first and second inverters. An operation for switching the first and second smoothing capacitors between the series connection and the parallel connection corresponding to the voltage system, and displaying the instruction of the set key operation and the conformity / nonconformity of the received AC voltage. A power supply device for plating, comprising a panel unit.
  5. The plating power source according to claim 1, wherein the operation panel unit is a panel operation / display unit, and is an operation panel unit including a display unit, a command input unit, and a control circuit including an operation panel CPU. apparatus.

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