JP2018007321A - Servo amplifier input current controller of component mounting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a servo amplifier input current controller of a component mounting machine, which can ensure a request performance of a servo motor while limiting a peak value of an input current supplied from an AC power supply.SOLUTION: A servo amplifier input current controller comprises: an input current restriction unit 21 operable to interrupt an input current supplied from an external AC power supply during a period in which the input current exceeds a given constant current range; capacitors C1, C2 charged by the input current during a period in which the input current is not interrupted by the input current restriction unit 21; and an inverter circuit 15 which uses a current discharged from the capacitors C1, C2 during the period in which the input current is interrupted by the input current restriction unit 21 to generate a peak current part of the input current over the given constant current range. In the servo amplifier input current controller, an input current supplied from the AC power supply is supplied to a servo amplifier 11 during a period in which the input current is not interrupted by the input current restriction unit 21; and the peak current part generated by the inverter circuit 15 is supplied to the servo amplifier 11 during a period in which the input current is interrupted by the input current restriction unit 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a servo amplifier input current control device for a component mounting machine that controls an input current of a servo amplifier that drives a servo motor mounted on the component mounting machine.

  In a component mounter that mounts components on a circuit board, a servo motor is used as a drive source for a moving mechanism that moves the mounting head in the XY directions, as described in Patent Document 1 (Japanese Patent Laid-Open No. 2009-200070). Used, an AC current is supplied from an external AC power source to the servo amplifier to drive the servo motor.

JP 2009-200070 A

  By the way, the servo amplifier is controlled so as to keep the power supplied to the servo motor constant in order to keep the output torque of the servo motor constant, so when the input voltage of the servo amplifier decreases, the input current of the servo amplifier increases. The peak value of the input current (inrush current) tends to increase.

  For this reason, in component mounters with a wide rated input voltage range, the peak value of the current supplied from the external AC power supply to the servo amplifier is considerably high at the lowest voltage in the rated input voltage range. Therefore, it is necessary to replace the breaker with a breaker having a large capacity so that the circuit breaker does not shut off even at the current peak value at the lowest voltage in the rated input voltage range.

  It is possible to provide a circuit that limits the peak value of the input current supplied from the AC power supply to the servo motor so that the breaker does not shut off when the voltage drops. Output current (servo motor input current) is also limited, and the output torque of the servo motor is reduced, making it impossible to ensure the required performance.

  Therefore, the problem to be solved by the present invention is to provide a servo amplifier input current control device for a component mounting machine that can ensure the required performance of the servo motor while limiting the peak value of the input current supplied from the AC power supply. It is.

  In order to solve the above-described problem, an invention according to claim 1 is directed to a servo amplifier input current control device for a component mounting machine that controls an input current of a servo amplifier that drives a servo motor mounted on a component mounting machine. An input current limiting unit that cuts off the input current when the input current supplied from the AC power source exceeds a predetermined current range, and a charge by the input current during a period when the input current is not cut off by the input current limiting unit. A peak current portion of the input current that exceeds the predetermined current range using a current discharged from the power storage means during a period when the input current is cut off by the input current limiting unit. A peak current generating unit to be generated, and a control unit for controlling the operation of the input current limiting unit and the peak current generating unit. The input current supplied from the AC power supply is supplied to the servo amplifier during a period when the input current is interrupted by the input current limiting unit, and is generated by the peak current generation unit during a period when the input current is interrupted by the input current limiting unit. Further, the peak current component is supplied to the servo amplifier.

  In this configuration, during the period when the input current supplied from the AC power source is not interrupted by the input current limiting unit, the input current is supplied to the servo amplifier while charging a part of the input current to the storage means, and the AC During the period when the input current supplied from the power source exceeds the predetermined current range and is cut off by the input current limiting unit, the peak current generating unit uses the discharge current of the power storage means to exceed the predetermined current range. Is generated and supplied to the servo amplifier. The peak value of the input current supplied from the AC power supply is limited to the specified current range, and the peak current exceeding the specified current range is generated and the servo is generated. It can be supplied to the amplifier, and it is possible to achieve both the limitation of the peak value of the input current supplied from the AC power supply and the required performance of the servo motor. As a result, even when a component mounting machine with a wide rated input voltage range is introduced into the factory, it is not necessary to increase the breaker capacity of the distribution board of the AC power supply as in the conventional case, and an increase in equipment cost can be suppressed.

  In this case, considering that the peak value of the input current supplied from the AC power supply becomes maximum at the lowest voltage in the rated input voltage range of the component mounting machine, the peak value of the input current is limited as in claim 2. The predetermined current range is preferably set so that the input current at the lowest voltage in the rated input voltage range of the component mounter falls within the current range in which the breaker of the distribution board of the AC power supply does not shut off. By doing so, it is possible to prevent the breaker of the distribution board from being cut off even at the lowest voltage in the rated input voltage range of the component mounting machine.

  By the way, an input current limiting unit that cuts off an input current exceeding a predetermined current range needs to be switched at high speed, and therefore may be configured using a semiconductor switching element. However, a semiconductor switching element has an on-resistance. If the input current is kept flowing while being kept on, there is a concern that a problem of voltage drop or heat generation may occur.

  Therefore, as in claim 3, a relay is provided in parallel with the input current limiting unit configured by the semiconductor switching element, and the control unit turns on the relay during a period in which the input current is stably within a predetermined current range. It is preferable to disable the input current limiting unit and maintain the relay in an off state to enable the input current limiting unit during a period when the input current is not stably within the predetermined current range. . In this way, when the input current supplied from the AC power supply is stable and within the predetermined current range (that is, the period when the input current does not need to be limited), the relay with little or no on-resistance is turned on. Thus, the input current can be supplied to the servo amplifier through this relay, and the problem of voltage drop and heat generation can be solved.

  Moreover, what is necessary is just to comprise the said peak current production | generation part by an inverter circuit like Claim 4. Thereby, the current discharged from the power storage means can be efficiently converted into the peak current by the inverter circuit.

  Further, as in the fifth aspect, it is preferable to prevent chattering by providing hysteresis to the switching characteristic of the input current cut-off / energization by the input current limiting unit. Similarly, it is preferable to provide hysteresis for the ON / OFF switching characteristics of the relay.

1 is a circuit diagram showing a circuit configuration of a servo motor drive control system according to a first embodiment of the present invention. FIG. 2 is a circuit diagram showing the configuration of the AC switch circuit. FIG. 3 is a diagram for explaining a primary-side current waveform (a waveform of an input current whose peak current is cut by an input current limiting unit) and a secondary-side current waveform (a waveform of an input current of a servo amplifier). FIG. 4 is a time chart for explaining the operation of the input current limiter of the AC switch circuit and the inverter circuit. FIG. 5 is a circuit diagram showing a circuit configuration of the servo motor drive control system according to the second embodiment of the present invention. FIG. 6 is a circuit diagram showing a circuit configuration of the servo motor drive control system according to the third embodiment of the present invention. FIG. 7 is a circuit diagram showing a circuit configuration of a servo motor drive control system according to a fourth embodiment of the present invention.

  Hereinafter, four Examples 1 to 4 embodying a mode for carrying out the present invention will be described.

A first embodiment of the present invention will be described with reference to FIGS.
First, the circuit configuration of the servo motor drive control system according to the first embodiment will be described with reference to FIG.

  The first embodiment is an embodiment in which the servo motor 11 is driven by a single-phase AC current supplied from a single-phase AC power source. The servo motor 11 is used as a driving source for a robot such as a moving mechanism that moves the mounting head of the component mounting machine in the X and Y directions.

  As shown in FIG. 1, the input current of the servo amplifier 12 that drives the servo motor 11 is controlled by a servo amplifier input current control device 13. The servo amplifier input current control device 13 includes an AC switch circuit 14, an inverter circuit 15 including capacitors C1 and C2 (power storage means), a drive circuit 16 that drives these, and a control circuit 17 that controls these operations ( Control section), a voltage detection circuit 18 for detecting the input voltage of the two power supply lines (U phase, V phase), and a current detection circuit 19 for detecting the input current of the servo amplifier 12. Yes.

  In the first embodiment in which a single-phase AC power supply is used, one AC switch circuit 14 and one current detection circuit 19 are provided for each U-phase power supply line. As shown in FIGS. 2 and 3, the AC switch circuit 14 includes an input current limiting unit 21 that cuts off the input current during a period in which the input current supplied from the single-phase AC power source exceeds a predetermined current range, and the input current limiting unit 21. It is comprised from the current limiting part 21 and the relay 22 connected in parallel. As the relay 22, a mechanical relay having almost no on-resistance or a semiconductor relay having a small on-resistance is used.

  Here, since the input current limiting unit 21 that cuts off the input current exceeding the predetermined current range needs to perform a switching operation at high speed, in the first embodiment, the MOSFET 23 that is a semiconductor switching element (power device) for power control. And four backflow prevention diodes D01 to D04 for regulating the direction in which the input current flows. However, since the semiconductor switching element such as the MOSFET 23 has an on-resistance, there is a concern that a voltage drop or a problem of heat generation may occur if the input current is kept flowing while being kept on.

  Therefore, in the first embodiment, the relay 22 is provided in parallel with the input current limiting unit 21, and the relay 22 is turned on during a period in which the input current supplied from the single-phase AC power supply is stably within a predetermined current range. The input current limiting unit 21 is invalidated, and the relay 22 is maintained in an OFF state during a period in which the input current is not stably within the predetermined current range, so that the input current limiting unit 21 is validated. In this way, the relay 22 having little or no on-resistance is provided during a period in which the input current supplied from the AC power supply is stably within a predetermined current range (that is, a period in which the input current does not need to be limited). When turned on, the input current can be supplied to the servo amplifier 12 through the relay 22, and the problems of voltage drop and heat generation can be solved.

  The capacitors C1 and C2 connected to the inverter circuit 15 are charged by a part of the input current during a period in which the MOSFET 23 of the input current limiting unit 21 is turned on and the input current is flowing. Then, the inverter circuit 15 discharges the capacitors C1 and C2 during the period when the MOSFET 23 is turned off and the input current is cut off. The capacitors C1 and C2 only need to have a capacity (capacity that can generate a peak current exceeding a predetermined current range described later) capable of charging about half a cycle of the input voltage.

  The inverter circuit 15 uses a current discharged from the capacitors C1 and C2 during a period when the input current is cut off by the input current limiting unit 21 to generate a peak current of the input current exceeding the predetermined current range. Functions as a generation unit. The inverter circuit 15 can efficiently convert the current discharged from the capacitors C1 and C2 into a peak current.

  In the first embodiment, the inverter circuit 15 is connected to two MOSFETs 24 and 25, parasitic diodes D1 and D2 formed between the drains and sources of the MOSFETs 24 and 25, and the drain side of the MOSFETs 24 and 25. The backflow prevention diodes D3 and D4 and the limiting resistors R1 and R2 connected in parallel with the backflow prevention diodes D3 and D4. Each of the limiting resistors R1 and R2 serves to suppress an inrush current flowing through each of the capacitors C1 and C2.

  The control circuit 17 monitors the effective value, phase, and polarity of the input voltage detected by the voltage detection circuit 18, and monitors the effective value and peak value of the input current detected by the current detection circuit 19, so that the AC switch circuit 14. And the operation of the inverter circuit 15 is controlled.

  In the servo amplifier input current control device 13 configured as described above, as shown in FIGS. 3 and 4, the input current (primary current) supplied from the AC power source is input by the input current limiting unit 21 of the AC switch circuit 14. While the capacitor C1 and C2 are partially charged, the input current is supplied to the servo amplifier 12 and the input current supplied from the AC power source exceeds the predetermined current range during the period when the input current is not cut off. During the period when the current limiter 21 is interrupted, the inverter circuit 15 uses the discharge currents of the capacitors C1 and C2 to generate a peak current exceeding a predetermined current range and supplies the peak current to the servo amplifier 12.

  Here, in consideration of the fact that the peak value of the input current supplied from the AC power supply is maximized at the lowest voltage in the rated input voltage range of the component mounter, the peak value of the input current is limited in the first embodiment. The “predetermined current range” is set so that the input current at the lowest voltage in the rated input voltage range of the component mounting machine falls within the current range in which the breaker of the distribution board of the AC power supply does not shut off. That is, the input current limit value, which is the maximum value of the “predetermined current range”, is set to a value smaller than the current value at which the breaker performs a cutoff operation.

  The control circuit 17 is mainly composed of a computer, and controls the operations of the AC switch circuit 14 and the inverter circuit 15 as follows.

  (1) It is determined whether or not the input current supplied from the single-phase AC power source is stably within a predetermined current range depending on whether or not the input voltage detected by the voltage detection circuit 18 exceeds a predetermined voltage. The servo amplifier 12 is controlled so as to keep the electric power supplied to the servo motor 11 constant in order to keep the output torque of the servo motor 11 constant. Therefore, when the input voltage becomes high, the servo amplifier 12 is controlled to decrease the input current. Therefore, the peak value of the input current tends to be low. Therefore, when the input voltage is high, the input current is stable and within a predetermined current range, and it is not necessary to limit the input current.

  Therefore, when the input voltage detected by the voltage detection circuit 18 exceeds a predetermined voltage, the control circuit 17 determines that there is no need to limit the input current, and turns on the relay 22 of the AC switch circuit 14 to turn on the input current. The limiting unit 21 is invalidated, and the input current supplied from the single-phase AC power supply is supplied to the servo amplifier 12 through the relay 22. At this time, the inverter circuit 15 is maintained in an inoperative state. Whether or not the input current supplied from the single-phase AC power source is stably within the predetermined current range is determined based on whether or not the input current detected by the current detection circuit 19 is equal to or less than the predetermined value. Anyway. It is preferable to provide chattering by providing hysteresis to the ON / OFF switching characteristics (determination threshold value) of the relay 22.

  (2) When the input voltage detected by the voltage detection circuit 18 is equal to or lower than the predetermined voltage, the control circuit 17 stably keeps the input current supplied from the single-phase AC power source within the predetermined current range. It is determined that it is necessary to limit the input current exceeding the predetermined current range, and the relay 22 of the AC switch circuit 14 is turned off to enable the input current limiting unit 21. As a result, until the input current supplied from the single-phase AC power supply exceeds the predetermined current range, the MOSFET 23 of the input current limiting unit 21 is maintained in the ON state, and the input current is supplied and supplied to the servo amplifier 12. As shown in FIG. 5, every time the input current exceeds the predetermined current range, the MOSFET 23 of the input current limiting unit 21 is turned off to cut off the input current. At this time, whether or not the input current exceeds the predetermined current range is determined based on the input current detected by the current detection circuit 19. Note that it is preferable to prevent chattering by providing hysteresis to the ON / OFF switching characteristics (determination threshold value of a predetermined current range) of the MOSFET 23.

  While the MOSFET 23 of the input current limiting unit 21 is turned on and the input current flows, the capacitors C1 and C2 of the inverter circuit 15 are charged by a part of the input current. At this time, when the input voltage is positive, current flows through the path of U phase → input current limiting unit 21 → parasitic diode D1 of the inverter circuit 15 → limit resistor R1 → capacitor C1 → V phase to charge the capacitor C1. When the input voltage is negative, a current flows through the path of V phase → capacitor C2 → parasitic diode D2 of the inverter circuit 15 → limit resistor R2 → input current limiter 21 → U phase to charge the capacitor C2.

  When the input current supplied from the single-phase AC power supply exceeds the predetermined current range, the MOSFET 23 of the input current limiting unit 21 is turned off to cut off the input current, and the MOSFETs 24 and 25 of the inverter circuit 15 are driven. Then, the current is discharged from the capacitors C1 and C2, and a peak current exceeding a predetermined current range is generated and supplied to the servo amplifier 12. At this time, on / off switching of the MOSFETs 24 and 25 is controlled according to the phase and polarity of the input voltage detected by the voltage detection circuit 18. Specifically, when the input voltage is on the plus side, one MOSFET 24 is turned on and discharged from the capacitor C1 to generate a peak current on the plus side. When the input voltage is on the minus side, the other MOSFET 25 is turned on. Is turned on and the capacitor C2 is discharged to generate a negative peak current. Thereafter, when the input current supplied from the single-phase AC power source falls within the predetermined current range, the drive of the inverter circuit 15 is stopped, the generation of the peak current is finished, and the MOSFET 23 of the input current limiting unit 21 is terminated. And an input current supplied from a single-phase AC power supply is supplied to the servo amplifier 12. At this time, the switching from the inverter circuit 15 to the input current limiting unit 21 is controlled so that the voltage is not mixed (simultaneously ON).

  According to the first embodiment described above, a part of the input current is charged to the capacitors C1 and C2 during a period when the input current supplied from the single-phase AC power supply is not cut off by the input current limiting unit 21. However, the inverter circuit 15 supplies the input current to the servo amplifier 12, and the inverter circuit 15 is connected to the capacitor C1 during a period when the input current supplied from the single-phase AC power supply exceeds the predetermined current range and is cut off by the input current limiting unit 21. , C2 discharge current is used to generate a peak current exceeding the predetermined current range and supply it to the servo amplifier 12, so that the peak value of the input current supplied from the single-phase AC power supply is predetermined. While limiting to the current range, a peak current exceeding the predetermined current range can be generated and supplied to the servo amplifier 12, and the peak of the input current supplied from the single-phase AC power supply can be supplied. It is possible to achieve both the ensuring of required performance value limits and servo motor 12. As a result, even when a component mounting machine with a wide rated input voltage range is introduced into the factory, it is not necessary to increase the breaker capacity of the distribution board of the AC power supply as in the conventional case, and an increase in equipment cost can be suppressed.

  Next, Embodiment 2 of the present invention will be described with reference to FIG. However, substantially the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted or simplified, and different parts are mainly described.

  In the first embodiment, the MOSFETs 24 and 25 having the parasitic diodes D1 and D2 are used as the semiconductor switching elements of the inverter circuit 15. However, in the second embodiment of the present invention shown in FIG. ) Semiconductor switching elements 32 and 33 such as transistors and IGBTs having no parasitic diode are used.

  In the second embodiment, a series circuit of a limiting resistor R1 and a backflow prevention diode D3 is connected in parallel to a series circuit of the backflow prevention diode D3 and the semiconductor switching element 32, and the backflow prevention diode D4 and the semiconductor are connected. A series circuit of a limiting resistor R2 and a backflow prevention diode D6 is connected in parallel to the series circuit of the switching element 33.

  While the MOSFET 23 of the input current limiting unit 21 of the AC switch circuit 14 is turned on and the input current is flowing, the capacitors C1 and C2 of the inverter circuit 31 are charged by a part of the input current. At this time, when the input voltage is on the plus side, the current flows in the path of the U phase → the input current limiting unit 21 of the AC switch circuit 14 → the reverse current preventing diode D5 of the inverter circuit 15 → the limiting resistor R1 → the capacitor C1 → the V phase. When the input voltage is negative, the capacitor C1 is charged, and when the input voltage is negative, the reverse current prevention diode D6 of the inverter circuit 15 → the limiting resistor R2 → the input current limiting unit 21 of the AC switch circuit 14 → the U phase. The current flows through the path and charges the capacitor C2.

  When the input current supplied from the single-phase AC power source exceeds the predetermined current range, the MOSFET 23 of the input current limiting unit 21 of the AC switch circuit 14 is turned off to cut off the input current, and the semiconductor switching of the inverter circuit 31 is performed. The elements 32 and 33 are driven to discharge current from the capacitors C1 and C2, and a peak current exceeding a predetermined current range is generated and supplied to the servo amplifier 12. At this time, on / off of the semiconductor switching elements 32 and 33 of the inverter circuit 31 is controlled in accordance with the phase and polarity of the input voltage detected by the voltage detection circuit 18. Specifically, when the input voltage is on the plus side, one of the semiconductor switching elements 32 is turned on and discharged from the capacitor C1 to generate a plus-side peak current. When the input voltage is on the minus side, The other semiconductor switching element 33 is turned on and discharged from the capacitor C2 to generate a negative peak current. Thereafter, when the input current supplied from the single-phase AC power source falls within the predetermined current range, the drive of the inverter circuit 31 is stopped, the generation of the peak current is finished, and the input current of the AC switch circuit 14 is terminated. The MOSFET 23 of the limiting unit 21 is turned on, and the input current supplied from the single-phase AC power supply is supplied to the servo amplifier 12.

  In the second embodiment described above, the same effect as that of the first embodiment can be obtained.

  Next, Embodiment 3 of the present invention will be described with reference to FIG. However, substantially the same parts as those in the first and second embodiments are denoted by the same reference numerals, description thereof is omitted or simplified, and different parts are mainly described.

  In the first and second embodiments, the servo motor 11 is driven by a single-phase AC current supplied from a single-phase AC power source. However, the third embodiment of the present invention shown in FIG. In this embodiment, the servo motor 11 is driven by a three-phase AC current supplied from an AC power source.

  In the third embodiment, AC switch circuits 14u to 14w having the same configuration as the AC switch circuit 14 of the first embodiment are provided on the U-phase, V-phase, and W-phase power supply lines, respectively, and an inverter circuit 41 (peak current) A single capacitor C1 that charges the peak current is connected to the generator. The three-phase inverter circuit 41 has a configuration in which the single-phase inverter circuit 15 of the first embodiment is provided for three phases. Specifically, a total of six MOSFETs 24u to 24w, 25u to 25w, Parasitic diodes D1u to D1w and D2u to D2w formed between the drains and sources of the MOSFETs 24u to 24w and 25u to 25w, and backflow prevention diodes D3u to D3w connected to the drain sides of the MOSFETs 24u to 24w and 25u to 25w, And D4u to D4w and limiting resistors R1u to R1w and R2u to R2w connected in parallel with the respective backflow prevention diodes D3u to D3w and D4u to D4w. Current detection circuits 19u to 19w for detecting the input current of the servo amplifier 12 are also provided for three phases. The voltage detection circuit 18 detects a three-phase input current. The control circuit 17 controls the operations of the AC switch circuits 14u to 14w and the inverter circuit 41 in the same manner as in the first embodiment for each of the U phase, the V phase, and the W phase.

  Also in the third embodiment described above, the same effect as in the first embodiment can be obtained.

  Next, Embodiment 4 of the present invention will be described with reference to FIG. However, substantially the same parts as those in the first to third embodiments are denoted by the same reference numerals, description thereof is omitted or simplified, and different parts are mainly described.

  A fourth embodiment of the present invention shown in FIG. 7 is an embodiment in which the servo motor 11 is driven by a three-phase AC current supplied from a three-phase AC power supply, as in the third embodiment. In the third embodiment, MOSFETs 24u to 24w and 25u to 25w having parasitic diodes D1u to D1w and D2u to D2w are used as semiconductor switching elements of the inverter circuit 41. However, in the fourth embodiment, the inverter circuit 42 (peak current) Semiconductor switching elements 32u to 32w and 33u to 33w such as transistors without IGBTs and IGBTs are used as the semiconductor switching elements of the generation unit.

  In the fourth embodiment, a series circuit of limiting resistors R1u to R1w and backflow prevention diodes D3u to D3w is connected in parallel to a series circuit of backflow prevention diodes D3u to D3w and semiconductor switching elements 32u to 32w. A series circuit of limiting resistors R2u to R2w and backflow prevention diodes D6u to D6w is connected in parallel to a series circuit of backflow prevention diodes D4u to D4w and semiconductor switching elements 33u to 33w. The control circuit 17 controls the operations of the AC switch circuits 14u to 14w and the inverter circuit 42 for each of the U phase, the V phase, and the W phase in the same manner as in the second embodiment.

In the fourth embodiment described above, the same effect as that of the first embodiment can be obtained.
Needless to say, the present invention is not limited to the first to fourth embodiments, and various modifications can be made without departing from the scope of the invention.

  DESCRIPTION OF SYMBOLS 11 ... Servo motor, 12 ... Servo amplifier, 13 ... Servo amplifier input current control apparatus, 14 ... AC switch circuit, 14u-14w ... AC switch circuit, 15 ... Inverter circuit (peak current generation part), 17 ... Control circuit (control) Part), 18 ... voltage detection circuit, 19 ... current detection circuit, 19u-19w ... current detection circuit, 21 ... input current limiting part, 22 ... relay, 23-25 ... MOSFET, 24u-24w, 25u-25w ... MOSFET, DESCRIPTION OF SYMBOLS 31 ... Inverter circuit (peak current generation part), 32, 33 ... Semiconductor switching element, 32u-32w, 33u-33w ... Semiconductor switching element, 41 ... Inverter circuit (peak current generation part), C1, C2 ... Capacitor (electric storage means )

Claims (5)

In the servo amplifier input current control device of the component mounting machine that controls the input current of the servo amplifier that drives the servo motor mounted on the component mounting machine that mounts the component on the circuit board,
An input current limiting unit that cuts off the input current during a period in which an input current supplied from an external AC power source exceeds a predetermined current range;
Power storage means charged by the input current during a period when the input current is not interrupted by the input current limiting unit;
A peak current generating unit that generates a peak current component of the input current exceeding the predetermined current range using a current discharged from the power storage means during a period when the input current is interrupted by the input current limiting unit;
A control unit for controlling the operation of the input current limiting unit and the peak current generation unit,
The input current supplied from the AC power source is supplied to the servo amplifier during a period when the input current is not cut off by the input current limiting unit, and the input current is cut off by the input current limiting unit. A servo amplifier input current control device for a component mounting machine, wherein the peak current generated by the peak current generator is supplied to the servo amplifier.   The predetermined current range is set so that the input current at the lowest voltage in the rated input voltage range of the component mounting machine is within a current range in which the breaker of the distribution board of the AC power supply does not shut off. The servo amplifier input current control device for a component mounting machine according to claim 1, wherein The input current limiting unit is constituted by a semiconductor switching element,
A relay is provided in parallel with the input current limiting unit,
The control unit maintains the relay in an on state during a period in which the input current is stably within the predetermined current range, invalidates the input current limiting unit, and the input current is stably stabilized in the predetermined current range. 3. The servo amplifier input current control device for a component mounting machine according to claim 1, wherein the input current limiting unit is validated by maintaining the relay in an off state during a period that does not fall within the range.   The servo amplifier input current control device for a component mounting machine according to any one of claims 1 to 3, wherein the peak current generator is configured by an inverter circuit.   The servo amplifier input of the component mounting machine according to any one of claims 1 to 4, wherein the input current cut-off / energization switching characteristic by the input current limiting unit is configured to have hysteresis. Current control device.

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