JP2013046481A - Waveform conversion device and power supply device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waveform conversion device, and a power supply device equipped with the same, capable of reducing a burdon when in use or during transportation.SOLUTION: A sine wave adapter 1 which is a waveform conversion device includes an input part 15 in which an external voltage is inputted, a display part 12 which displays a setting state of the sine wave adapter 1, a setting part 13 for setting output frequency of the sine wave adapter 1, and a cooling fan 16 for cooling the sine wave adapter 1. The waveform of a voltage inputted from outside is converted into a sine wave by an inverter circuit 118 provided to the sine wave adapter 1. The voltage having been converted to a sine waveform by the inverter circuit 118 is outputted from an output cable 14 to the outside.

Description

  The present invention relates to a waveform converter and a power supply device including the waveform converter.

  Conventionally, an inverter device that converts a DC voltage into an AC voltage and outputs the same is known (for example, see Patent Document 1).

JP 2009-278832 A

  Although it is conceivable to use the inverter device as a power source for a precision device, when the output of the inverter device is a rectangular wave voltage, the precision device may not operate normally at the rectangular wave voltage. Accordingly, it is conceivable to connect a waveform converter (sine wave adapter) between the inverter device and the precision device to convert the rectangular wave voltage into a sine wave voltage.

  However, since the sine wave adapter and the inverter device have separate structures, there is troublesome use and transportation.

  An object of this invention is to provide the waveform converter which reduces the burden at the time of use and conveyance, and a power supply device provided with the same.

  In order to achieve the above object, the present invention includes an input unit to which a voltage is input, an inverter circuit that converts the waveform of the voltage into a sine waveform, and an output unit that outputs the voltage of the sine waveform. A waveform converter is provided.

  Since it includes an input unit to which a voltage is input, an inverter unit that converts a voltage waveform into a sine waveform, and an output unit that outputs a voltage having a sine waveform, for example, the inverter can be attached to an existing inverter device Since the rectangular wave output from the device can be shaped into a sine wave, the existing inverter device can be used as a power source for precision equipment or the like with a simple and inexpensive configuration. Any input waveform can be converted to a sine wave.

  In addition, it is preferable that a substantially box-shaped housing having an upper surface, a bottom surface, and a side surface is provided, and an inverter device fixing portion capable of fixing the inverter device that supplies the input voltage is provided in the housing.

  Since the inverter device fixing portion capable of fixing the inverter device is provided in the housing, the inverter device can be fixed in a state where the sine is placed on the adapter. Therefore, the sine wave adapter and the inverter device can be used in a compact state.

  Preferably, the inverter device converts a DC voltage into a rectangular wave AC voltage and outputs the converted voltage, and converts the rectangular wave AC voltage into a sine wave AC voltage and outputs the converted voltage.

  The inverter device converts the DC voltage into a rectangular AC voltage and outputs it, and converts the rectangular AC voltage into a sine AC voltage and outputs it, so it can be transported in a car battery etc. to select a location A sinusoidal AC voltage can be obtained from a portable battery.

  The inverter device fixing portion is preferably provided on the upper surface of the housing.

  Since the inverter device fixing portion is provided on the upper surface of the housing, the inverter device can be easily attached to the waveform converter.

  The inverter device may convert the DC voltage from the power tool battery pack to an AC voltage and output the AC voltage, and the inverter device connected to the power tool battery pack may be fixed to the inverter device fixing portion. preferable.

  The inverter device converts the DC voltage from the power tool battery pack into an AC voltage and outputs it, and the inverter device connected to the power tool battery pack can be fixed to the inverter device fixing portion, thereby improving portability. Can do.

  An input / output terminal directed to the outside of the housing is provided on one side surface of the housing, and the inverter device includes a substantially box-shaped inverter housing having a top surface, a bottom surface, and a side surface. An inverter input / output terminal directed to the outside of the inverter housing is provided on one side surface of the inverter housing. The inverter device has a bottom surface of the inverter housing that faces the top surface of the housing, and the one side of the inverter housing. It is preferable that the four side surfaces of the inverter housing are fixed to the inverter device fixing portion in a positional relationship corresponding to the four side surfaces of the housing so that the side surfaces correspond to the one side surface of the housing.

  In the inverter device, the bottom surface of the inverter housing faces the top surface of the housing, and the four side surfaces of the inverter housing correspond to the four side surfaces of the housing so that one side surface of the inverter housing corresponds to one side surface of the housing. In relation, since it is fixed to the inverter device fixing portion, the inverter input / output terminal and the adapter input / output terminal can be arranged close to each other, and a short cable can be used as a cable connected to them. In addition, it is possible to compact the cables.

  Further, the inverter device preferably has an engaging portion that engages with the inverter device fixing portion, and the engaging portion and the input / output terminal are preferably provided on different surfaces.

  The inverter device has an engaging portion that engages with the inverter device fixing portion, and the engaging portion and the input / output terminal are provided on different surfaces. When performing the operation of engaging with the inverter device fixing portion, it does not interfere with the operation.

  The control circuit further includes a boosting circuit that boosts the input voltage, a control unit that controls the boosting circuit and the inverter circuit, and a voltage detection unit that detects the voltage input to the input unit. Preferably, the unit prohibits the boosting operation when the voltage detected by the voltage detection unit is within a boost prohibition range.

  According to such a configuration, since the booster circuit is not operated when an appropriate voltage is input to the input unit, it is possible to prevent the power from being wasted by operating the booster circuit unnecessarily.

  The inverter circuit includes an inverter unit that converts the output voltage of the booster circuit into a pulse wave, and a shaping unit that shapes the pulse wave into a sine wave, and the control unit is detected by the voltage detection unit. It is preferable to operate the inverter circuit without operating the booster circuit when the measured voltage is within the boost prohibition range.

  Further, it is preferable that the control unit prohibits the operation of at least one of the booster circuit and the inverter circuit when the voltage detected by the voltage detection unit is out of an input allowable range.

  According to such a configuration, when an appropriate voltage is not input to the input unit, at least one of the booster circuit and the inverter circuit is not operated, so that the elements included in the booster circuit or the inverter circuit are prevented from being damaged. can do.

  The waveform converter of the present invention further includes a current detection unit that detects a current flowing through the inverter circuit, and the control unit outputs the current from the inverter circuit when the current flowing through the current detection unit is a predetermined value or more. It is preferable to control the inverter circuit so that the voltage to be reduced is reduced.

  According to such a configuration, since a large current is suppressed from flowing through the inverter circuit, it is possible to suppress damage to elements such as FETs that configure the inverter circuit.

  The waveform converter of the present invention further includes a frequency setting unit capable of setting the frequency of the voltage output from the output unit, and the control unit outputs the voltage of the frequency set by the frequency setting unit. Preferably, the inverter circuit is controlled so as to be output from the unit.

  According to such a configuration, since the frequency of the voltage output from the waveform converter can be changed, for example, the waveform converter can be used in both Kanto and Kansai where the frequency of the commercial power supply is different. Become.

  The waveform converter of the present invention further includes a voltage setting unit capable of setting a voltage output from the output unit, and the control unit outputs the voltage set by the voltage setting unit from the output unit. It is preferable to control the booster circuit so that the

  According to such a configuration, since the voltage output from the waveform converter can be changed, for example, it can be used even overseas where the voltage of the commercial power source is different.

  The waveform converter of the present invention includes a waveform discriminating unit that discriminates the waveform of the voltage input to the input unit, a bypass circuit that is connected between the input unit and the output unit, and that can be turned on / off. The control unit preferably turns on the bypass circuit when the waveform detected by the waveform determination unit is a sine wave.

  In particular, it is preferable that the control unit prohibits at least the operation of the inverter circuit when the waveform detected by the waveform determination unit is a sine wave.

  According to such a configuration, when the waveform of the input voltage is a sine wave, power is allowed to flow to the bypass circuit without operating the inverter circuit. Can be prevented.

  The housing is formed with a through hole that communicates the inside and the outside of the housing, and a shielding wall is provided in a portion of the housing facing the through hole. A drainage space is formed between the housing portion in which a hole is formed, and a lower portion of the drainage space is defined by a bottom surface, and a bottom portion that defines a lower portion of the drainage space is provided inside and outside the housing. It is preferable that a drainage through hole that communicates with each other is formed.

  The housing has a through-hole that communicates the inside and the outside of the housing, and a shielding wall is provided in a portion of the housing facing the through-hole, and the portion of the housing in which the shielding wall and the through-hole are formed The bottom of the drainage space is defined by the bottom surface, and the bottom of the bottom of the drainage space is formed with a drainage through hole that communicates the interior and exterior of the housing. Therefore, it is possible to prevent water such as rainwater flowing in from the through hole from entering the adapter housing from the shielding wall, and to discharge water flowing into the drainage space to the outside of the adapter housing. Can do. Further, when a fan for cooling the circuit board that generates heat is provided in the adapter housing, the through hole can be used as an inflow port or an exhaust port for the air flowing into the adapter housing by the fan.

  A circuit board having a voltage conversion circuit for converting a rectangular wave AC voltage into a sinusoidal AC voltage and outputting the AC voltage of the sine wave; and the entire circuit board is covered with a resin material. preferable.

  Since it has a circuit board having a voltage conversion circuit that converts a rectangular wave AC voltage into a sine AC voltage and outputs a sine AC voltage, and the entire circuit board is covered with a resin material, the adapter housing Even when water or dust such as rainwater flows in, it is possible to prevent the water or dust from directly contacting the circuit board.

  In another aspect of the present invention, a box-shaped main body having an opening formed at one end thereof, a lid provided on the main body so as to be able to open and close the opening, a lead storage battery housed in the main body, And an inverter device to which a direct-current voltage from a lead storage battery can be supplied via an adapter, and the main body portion can accommodate a waveform converter.

  A lead-acid battery housed in the main body part and an inverter device to which a direct-current voltage from the lead-acid battery can be supplied via an adapter, and the main body part can accommodate the waveform converter, so that the lead-acid battery is more The usable time can be lengthened.

  The inverter device can be fixed to the lid, and the waveform converter and the inverter device are connected in a state where the inverter device is fixed to the lid and the waveform converter is accommodated in the main body. It is preferable to be possible.

  The inverter device can be fixed to the lid, and the waveform converter and the inverter device can be connected in a state where the inverter device is fixed to the lid and the waveform converter is housed in the main body. And the power supply device can be used in a state where they are fixed in a compact manner.

  ADVANTAGE OF THE INVENTION According to this invention, the sine wave adapter which reduces the burden at the time of use and conveyance can be provided.

1 is a front perspective view of a sine wave adapter according to a first embodiment of the present invention. The side view of the sine wave adapter which concerns on the 1st Embodiment of this invention 2 is a partial cross-sectional view of the sine wave adapter according to the first embodiment of the present invention along III-III in FIG. 2. FIG. 3 is an exploded plan view of the sine wave adapter according to the first embodiment of the present invention. The front perspective view of the inverter apparatus which concerns on the 1st Embodiment of this invention The front perspective view which shows the state which mounted | wore the sine wave adapter based on the 1st Embodiment of this invention, the inverter apparatus, and the battery pack. The rear perspective view which shows the state which mounted | wore the sine wave adapter which concerns on the 1st Embodiment of this invention, the inverter apparatus, and the battery pack. 1 is an exploded perspective view of a sine wave adapter, an inverter device, and a battery pack according to a first embodiment of the present invention. The side view which shows the state which mounted | wore the sine wave adapter based on the 1st Embodiment of this invention, the inverter apparatus, and the battery pack. 1 is an exploded side view of a sine wave adapter, an inverter device, and a battery pack according to a first embodiment of the present invention. 1 is an exploded front view of a sine wave adapter, an inverter device, and a battery pack according to a first embodiment of the present invention. Side surface sectional drawing of the power supply device which concerns on the modification of the 1st Embodiment of this invention The front perspective view which shows the state which mounted | wore the sine wave adapter which concerns on the modification of the 1st Embodiment of this invention, the inverter apparatus, and the adapter. The rear perspective view which shows the state which mounted | wore with the sine wave adapter which concerns on the modification of the 1st Embodiment of this invention, an inverter apparatus, and an adapter. The figure which illustrates the usage type of the sine wave adapter which is a waveform converter by the 1st Embodiment of this invention. The figure explaining the change of the voltage waveform in each apparatus of FIG. The block diagram of the sine wave adapter by the 1st Embodiment of this invention. The circuit diagram of the sine wave adapter by the 1st Embodiment of this invention. The figure explaining the inrush current in case the inrush current prevention circuit is not provided. The figure explaining the inrush current in case the inrush current prevention circuit is provided. The figure which shows the example of a display of the display part by the 1st Embodiment of this invention. 5 is a flowchart relating to input voltage monitoring, boost necessity determination, and soft start according to the first embodiment of the present invention. Explanatory drawing of the soft start by the 1st Embodiment of this invention. The circuit diagram of the sine wave adapter which is a waveform converter by the 2nd Embodiment of this invention. The flowchart regarding control of the bypass circuit by the 2nd Embodiment of this invention. The figure explaining the change of the waveform in the waveform discrimination circuit by the 2nd Embodiment of this invention. The circuit diagram of the sine wave adapter which is a waveform converter by the 3rd Embodiment of this invention The flowchart regarding the overcurrent control by the 4th Embodiment of this invention. The circuit diagram of the sine wave adapter by a modification. The flowchart regarding the input voltage monitoring by a modification, the necessity determination of pressure | voltage rise, and a soft start. 2 is a partial cross-sectional view taken along a line III-III in FIG. 2 of a sine wave adapter according to a fifth embodiment of the present invention.

  Hereinafter, the configuration of a sine wave adapter 1 as a waveform converter according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIGS. 1 to 4, the sine wave adapter 1 includes a casing 10 that forms an outer shell of the sine wave adapter 1, an engaging portion 11 that protrudes from the casing 10, and a setting state of the sine wave adapter 1. A display unit 12 that displays the output frequency, a setting unit 13 that sets the output frequency of the sine wave adapter 1, an output cable 14, an input unit 15 that receives external input, a cooling fan 16, and a circuit board 17. I have.

  In the following description, the direction in which the display unit 12 is provided is defined as front and the reverse is defined as rear. Further, the direction in which the exhaust port 10b is provided is defined as right, and the opposite is defined as left.

  The housing 10 is formed with an intake port 10a for taking in outside air and an exhaust port 10b for discharging the taken-out outside air. The sine wave adapter 1 is a device that outputs a voltage (for example, rectangular wave AC 100V voltage) input from an inverter device 2 described later as a sine wave AC 100V. As shown in FIGS. 1 and 2, a plurality of intake ports 10 a and exhaust ports 10 b are formed side by side in the front-rear direction in a substantially rectangular shape that is long in the vertical direction. The opening areas of the intake port 10a and the exhaust port 10b are substantially the same. As shown in FIG. 3, a partition wall 10 </ b> A for preventing water entering from the air inlet 10 a from entering the inside is separated from the side surface of the housing 10 by a predetermined distance on the bottom surface of the sine wave adapter 1. Thus, the housing 10 is erected upward from the bottom surface. That is, they are erected on the intake port 10a side and the exhaust port 10b side, respectively. A drainage port 10c is formed between the side surface of the casing 10 and the partition wall 10A on the bottom surface of the sine wave adapter 1 for discharging water that has entered through the intake port 10a to the outside. Between the housing 10 and the partition wall 10A, a drainage space 10d for temporarily storing water that has entered from the air inlet 10a is defined. As shown in FIG. 4, the partition wall 10 </ b> A is provided so as to surround the circuit board 17 and also plays a role of positioning the circuit board 17. The exhaust port 10b has the same structure as that shown in FIG. The housing 10 corresponds to the housing (adapter housing) of the present invention, the intake port 10a and the exhaust port 10b correspond to the through hole of the present invention, the drain port 10c corresponds to the drain through hole of the present invention, and the partition wall 10A. Corresponds to the shielding wall of the present invention.

  The engaging portion 11 is provided on the upper surface of the housing 10 and can be engaged with an engaged portion provided at an end portion of the detachable button 23 of the inverter device 2 shown in FIG. The detailed configuration of the inverter device 2 will be described later. The engaging portions 11 are provided at both ends of the upper surface of the housing 10 in the left-right direction. Thereby, since the sine wave adapter 1 is fixed to the inverter apparatus 2 in two places, both can be fixed reliably. Moreover, since the engaging part 11 is provided in the edge part of the upper surface, even if big force is added to one of the sine wave adapter 1 and the inverter apparatus 2, it is suppressed that it mutually shifts. The engaging portion 11 corresponds to the inverter device fixing portion of the present invention.

  The display unit 12 is inclined obliquely downward toward the front, and is configured to be easily seen from the front even when the inverter device 2 is fixed to the sine wave adapter 1. The display unit 12 is provided with two LED lamps. When the setting unit 13 sets the output frequency of the sine wave adapter 1 to 50 Hz, one LED lamp is lit, and the setting unit 13 outputs the output frequency. Is set to 60 Hz, the other LED lamp is lit.

  Similarly to the display unit 12, the setting unit 13 is inclined obliquely downward toward the front, and is configured to be easily seen from the front even when the inverter device 2 is fixed to the sine wave adapter 1. The setting unit 13 is a push button switch, and the output frequency of the sine wave adapter 1 can be switched by pressing the setting unit 13.

  The output cable 14 extends outward from the rear surface of the housing 10, and a plug 14A is provided at the tip. A sinusoidal AC 100V voltage is output from the plug 14A.

  The input unit 15 is provided on the rear surface of the housing 10 so as to be adjacent to the output cable 14. The output from the inverter device 2 is input to the input unit 15. The output cable 14 and the input unit 15 correspond to an adapter input / output terminal of the present invention.

  As shown in FIG. 4, the cooling fan 16 is fixed in the vicinity of the exhaust port 10b on the right side surface of the sine wave adapter 1, and sucks outside air from the intake port 10a and discharges it from the exhaust port 10b. 1 Cool the inside. The cooling fan 16 is always activated when the sine wave adapter 1 is operated. The cooling fan 16 may be driven according to the temperature of the circuit board 17 or the like.

  The circuit board 17 is disposed in the sine wave adapter 1 and includes a plurality of electronic components such as capacitors. The outer peripheral surface of the circuit board 17 is covered with urethane 17A. Specifically, the circuit board 17 is arranged in a region surrounded by the partition wall 10A and the side surface of the housing 10, and the urethane 17A is poured therein. By curing the poured urethane 17A, the circuit board 17 and the electronic components on the circuit board 17 are covered with the urethane 17A. The hatched portion in FIG. 4 is the urethane 17A filling region. As a result, the circuit board 17 is fixed to the housing 10, and at the same time, the circuit board 17 can be waterproofed, vibration-proofed, and dust-proofed.

  The sine wave adapter 1 of this embodiment is detachable from the inverter device 2. The inverter device 2 can be mounted with a battery pack 5 (for example, 14.4V, 3, 0A using a lithium battery) for a power tool as a storage battery. As shown in FIG. 5, the inverter device 2 includes a housing 20 that forms an outer shell of the inverter device 2, a display panel 21 that displays the state of the inverter device 2, an output cable 22, a detachable button 23, and a battery pack. 5, a power input unit 25 that receives external input, a power cable 26 that is detachably attached to the power input unit 25, and a band locking unit 27. The inverter device 2 converts the DC 14 and 4 V voltage from the battery pack 5 into a rectangular wave AC 100 V and outputs the converted voltage from the output cable 22. The inverter device 2 can also charge the battery pack 5 by input from the commercial power source by connecting the power cable 26 to the commercial power source. Further, the DC output of the battery pack 5 can be obtained from the output cable 22. Further, an AC voltage can be directly output from the commercial power supply to the output cable 22.

  The display panel 21 is provided with an LED lamp. Depending on whether the LED lamp is lit or blinking, whether the operator is charging the battery pack 5 or obtaining an output from the output cable 22 or not Whether or not an abnormality has occurred can be determined. The output cable 22 extends outward from the rear surface of the housing 20. The attachment / detachment buttons 23 are provided at both ends in the left-right direction, and the inverter device 5 can be attached to and detached from the sine wave adapter 1 by simultaneously pressing the left and right attachment / detachment buttons 23. An engaged portion that can be engaged with the engaging portion 11 is provided at the end of the detachable button 23 and on the bottom surface of the housing 20. The engaged portion corresponds to the engaging portion of the present invention.

  In addition to the battery pack 5, the accommodating portion 24 can also be mounted with an adapter 4 (FIGS. 12 to 14) that has substantially the same shape as the battery pack 5 and is connected to a power source 3 (lead storage battery) described later. The adapter 4 is connected to the lead storage battery 3 via the cable 4A. By using the lead storage battery 3 having a large capacity (12 V, 38 Ah), it can be used as a power source for a longer time than the battery pack 5. A detailed configuration will be described later.

  The power input unit 25 and the power cable 26 extend outward from the rear surface of the inverter device 2. The output cable 22 and the power input unit 25 correspond to the inverter input / output terminal of the present invention.

  The band locking portions 27 are provided at both left and right ends of the front portion of the inverter device 2 and can lock a shoulder band (not shown). The band locking portion 27 is provided on the side surface opposite to the output cable 22 and the power input portion 25, and the output cable 22 extends from the lower side in the vertical direction in a state where the operator puts a band (not shown) on the shoulder. Yes. Therefore, portability improves by connecting the sine wave adapter 1 and the inverter apparatus 2, and using the battery pack 5 for electric tools as a power supply. Further, since the band locking portion 27 and each input / output portion are provided on different surfaces, they do not interfere with each other. Note that the sine wave adapter 1 may be provided with a band locking portion 27.

  As shown in FIGS. 6 to 11, the bottom surface of the inverter device 2 is fixed so as to face the top surface of the sine wave adapter 1 by engaging the engaging portion 11 and the engaged portion of the inverter device 2. The By inserting the output cable 22 into the input unit 15 in a state where the battery pack 5 is mounted in the housing unit 24, a sinusoidal AC 100 V voltage can be obtained from the output cable 14. Since the areas of the bottom surface of the inverter device 2 and the top surface of the sine wave adapter 1 are substantially the same, and the lengths in the front-rear direction and the left-right direction are also substantially the same, the sine wave adapter 1 is integrally fixed to the inverter device 2. can do.

  As shown in FIG. 7, with the sine wave adapter 1 fixed to the inverter device 2, the output cable 14, the input unit 15, the output cable 22, and the power input unit 25 (hereinafter referred to as the input / output unit) are gathered in one place. Arranged to be. More specifically, the input unit 15 of the sine wave adapter 1 and the output cable 22 of the inverter device 2 are arranged on the same plane, and the input unit 15 is located immediately below the power input unit 25 so that the output cable 22 ( The output cable 14 is arranged so as to be located immediately below the connecting portion with the housing 20. Thereby, the twisting of the cables of the sine wave adapter 1 and the inverter device 2 is minimized.

  In a state where the sine wave adapter 1 is fixed to the inverter device 2, the input / output unit is located on the side surface opposite to the band locking unit 27. A cable 4A of the adapter 4 described later is also located in the vicinity of the input / output unit. As a result, the cables extend from the lower side in the vertical direction in a state where the operator holds the band (not shown) locked to the band locking portion 27 on the shoulder. Therefore, the input / output unit does not disturb the worker.

  With such a configuration, the sine wave adapter 1 and the inverter device 2 can be used and transported in a compact state. Moreover, since the sine wave adapter 1 and the inverter apparatus 2 are fixed when the engaging part 11 and the to-be-engaged part engage, it can prevent that one side is accidentally removed from the other.

  In the inverter device 1, the bottom surface of the housing 10 faces the top surface of the housing 20, and the four side surfaces of the housing 10 correspond to the four side surfaces of the housing 20 so that the side surfaces of the housing 20 correspond to the side surfaces of the housing 10. Since it is fixed to the engaging portion 11 in a corresponding positional relationship, the output cable 14, the input portion 15, the output cable 22, and the power input portion 25 can be arranged close to each other, and a short cable is connected to them. Can be used. In addition, it is possible to compact the cables.

  The housing 10 is formed with an air inlet 10a and an air outlet 10b that communicate the inside and the outside of the housing 10, and a partition 10A is provided in a portion of the housing 10 that faces the air inlet 10a and the air outlet 10b. Is formed between the partition 10A and the portion of the housing 10 in which the air inlet 10a and the air outlet 10b are formed. The lower portion of the drain space 10d is defined by the bottom surface, and the lower portion of the drain space 10d is defined. A drain port 10c that communicates the inside and the outside of the housing 10 is formed in the portion of the bottom surface that is defined, so that water such as rainwater that has flowed in from the air inlet 10a and the air outlet 10b is more housing than the partition wall 10A. Intrusion into the body 10 can be prevented, and water flowing into the drainage space 10d can be discharged from the housing 10 to the outside.

  Since it has a circuit board 17 having a voltage conversion circuit that converts a rectangular wave AC voltage into a sine wave AC voltage and outputs a sine AC voltage, the entire circuit board 17 is covered with urethane 17A. Even when water or dust such as rainwater flows into the circuit board 10, it is possible to prevent the water or dust from directly contacting the circuit board 17.

  Next, modifications of the embodiment will be described with reference to FIGS. In a modification, it replaces with the battery pack 5 for electric tools, and uses the lead acid battery for motor vehicles as a DC power supply (drive source).

  The sine wave adapter 1 can be accommodated in the power supply device 101. The power supply apparatus 101 mainly includes a main body portion 102 that constitutes an outer frame, and an upper lid 103 that serves as a lid body that opens and closes an internal space 102 a in the main body portion 102. In the internal space 102a of the main body 102, an automotive lead storage battery 3 (12V) used as a power source instead of the power tool battery pack 5, a room in which the lead storage battery 3 is stored, and the sine wave adapter 1 are stored. An inner lid 105 that divides the room is accommodated.

  The main body portion 102 is provided with a protruding portion 102A that protrudes into the internal space 102a above the lead storage battery 3 and a wheel 102B that is rotatably supported by the main body portion 102. An upper portion of the main body 102 is opened, and the opening can be opened and closed by the upper lid 103. The lead storage battery 3 is fixed to the internal space 102a by a battery shaft 3A. The inner lid 105 is placed on the protruding portion 102 </ b> A of the main body portion 102. The sine wave adapter 1 is placed on the upper surface of the inner lid 105.

  The inverter device 2 is placed on the upper lid 103, and the upper lid 103 is provided with a locking portion similar to the inverter locking portion 11 of the sine wave adapter 1, and is engaged with the detachable button 23 of the inverter device 2. The inverter device 2 can be fixed to the upper lid 103. The inverter device 2 is supplied with a DC voltage from the lead storage battery 3 through an adapter 4 having a connection part (terminal or rail part connected to the storage part 24) having the same shape as the battery pack 5 for an electric tool. The adapter 4 and the lead storage battery 3 are connected via a cable 4 </ b> A extending from the adapter 4.

  The cable 4 </ b> A of the adapter 4, the cables of the sine wave adapter 1 and the inverter device 2 are exposed to the outside of the main body 102 through a groove (not shown) provided in the inner lid 105 and the upper lid 103. In the state shown in FIG. 12, the inverter device 2 is supplied with a DC voltage from the lead storage battery 3 through the adapter 4 and the cable 4A. The inverter device 2 boosts the DC voltage 12 V from the lead storage battery 3 and converts the waveform to output a rectangular AC voltage from the output cable 22. The rectangular wave AC voltage input from the input unit 15 of the sine wave adapter 1 is converted into a sine wave AC voltage by the sine wave adapter 1 and output from the output cable 14.

  Moreover, it is also possible to use it in the state which connected the sine wave adapter 1 and the inverter apparatus 2 similarly to the time of using the battery pack 5 for electric tools mentioned above. When the upper lid 103 is opened and the inverter device 2 is attached to the sine wave adapter 1, the state shown in FIGS. 13 and 14 can be obtained. Moreover, if the sine wave adapter 1 is provided with a mechanism similar to the detachable button 23 of the inverter device 2, it can be fixed to the upper lid 103 in the state shown in FIG.

  According to the modified example, the portability of the sine wave adapter 1 and the inverter device 2 is inferior to that when using the battery pack 5 for the electric tool, but since the lead storage battery 3 having a large capacity can be used, it can be used for a long time. It becomes. Further, since the main body 102 is provided with the wheels 102B, the power supply device 101 can be easily moved, and the usage applications are widened.

  Further, as shown in FIG. 14, the input / output unit (input unit 15 and the like) is provided on the left and right sides of the rear surfaces of the housing 10 and the housing 20, and the storage unit 24 is provided on the left and right sides. The cable 4A of the adapter 4 and the input / output unit do not interfere with each other. Therefore, the input / output unit does not interfere with the attaching / detaching operation of the adapter 4.

  Next, the electrical configuration of the sine wave adapter 1 that is the waveform converter according to the first embodiment of the present invention will be described with reference to FIGS. 15 to 22.

  FIG. 15 illustrates the usage pattern of the sine wave adapter 1 according to the present embodiment, and FIG. 16 is a diagram illustrating changes in voltage waveforms in each device.

As shown in FIG. 15, the sine wave adapter 1 can be connected to the inverter device 2 via the input terminal A. First, a DC voltage is supplied to the inverter device 2 from the lead storage battery 3 through the adapter 4 (FIGS. 15A and 16A). The lead storage battery 3 may be the battery pack 5 for the electric tool described above. In addition, the voltage of the lead storage battery 3 varies depending on the charge / discharge state, life, and the like.
The inverter device 2 boosts the DC voltage to a DC voltage of about 141 V by a booster circuit (FIGS. 15B and 16B), and converts it to a rectangular wave voltage (effective value AC100V) by the inverter circuit. (FIG. 15 (c), FIG. 16 (c)).
The sine wave adapter 1 first rectifies the rectangular wave voltage input to the input terminal A into a DC voltage by a rectifier circuit (FIGS. 15 (d) and 16 (d)), and the DC voltage is reduced by a booster circuit. The voltage is transformed to 141 V (FIGS. 15E and 16E). Note that the output of the rectifier circuit varies depending on the output of the inverter device 2, and the output decreases when the load is large. The sine wave adapter 1 converts the transformed DC voltage into a pulse wave voltage with an inverter circuit (FIG. 15 (f), FIG. 16 (f)), and then converts the pulse wave voltage into a sine wave voltage with a shaping circuit. Conversion is performed (FIG. 15 (g), FIG. 16 (g)). The inverter circuit is switched at a switching frequency of 20 kHz. The sine wave voltage can be output to a precision device or the like via the output terminal B. Here, the lead storage battery 3, the inverter device 2, and the sine wave adapter 1 constitute a power supply device.

  Next, the circuit configuration of the sine wave adapter 1 will be described. FIG. 17 is a block diagram of the sine wave adapter 1, and FIG. 18A is a circuit diagram of the sine wave adapter 1.

  As shown in FIGS. 17 and 18A, the sine wave adapter 1 includes a rectifier circuit 111, a first smoothing capacitor 112, an inrush current prevention circuit 113, a voltage detection circuit (voltage detection unit) 114, an auxiliary circuit. A power supply 115, a booster circuit 116, a second smoothing capacitor 117, an inverter circuit 118, a current detection resistor 119, a driver IC 120, a microcomputer 121, a frequency switching circuit 122, and a fan mechanism 124 are provided. . The microcomputer 121 corresponds to the control unit of the present invention.

  The rectifier circuit 111 and the first smoothing capacitor 112 rectify and smooth the rectangular wave voltage input from the inverter device 2, and the voltage input from the inverter device 2 as shown in FIGS. A DC voltage corresponding to the maximum value is output.

  The inrush current prevention circuit 113 is for preventing a large inrush current from flowing in the sine wave adapter 1 when the power is turned on. Mainly, the FET 131, the inrush current prevention resistor 132, the voltage dividing resistor 133, 134. The inrush current preventing resistor 132 has a resistance value such that a large current does not flow through the first smoothing capacitor 112.

  Here, a case where a rectangular wave having a maximum voltage of 141 V is input to the sine wave adapter 1 without the inrush current prevention circuit 113 is considered. In this case, for example, when the impedance on the pattern is calculated as 1Ω, an inrush current of 141 A at the maximum flows in the sine wave adapter 1 due to the presence of the first smoothing capacitor 112 as shown in FIG. Therefore, there is a risk of damaging elements such as FETs in the sine wave adapter 1.

  However, in this embodiment, the inrush current prevention resistor 132 is connected in series with the first smoothing capacitor 112, and the inrush current prevention resistor 132 is connected in parallel with the FET 131. After the inverter device 2 is powered on (after the operation of the sine wave adapter 1 is started), the FET 131 divides the voltage output from the rectifier circuit 111 and the first smoothing capacitor 112 by the voltage dividing resistors 133 and 134 into the gate voltage of the FET 131. Therefore, while the FET 131 is turned off, the current flows from the first smoothing capacitor 112 to the inrush current preventing resistor 132. Therefore, in this case, for example, when the resistance value of the inrush current preventing resistor 132 is calculated as 100Ω, the inrush current flowing in the sine wave adapter 1 is about 1.4 A as shown in FIG. Therefore, damage to elements such as FETs in the sine wave adapter 1 can be suppressed.

  On the other hand, if a current continues to flow through the inrush current preventing resistor 132 even after the large inrush current is settled, power is wasted. Therefore, in the present embodiment, the resistance values of the voltage dividing resistors 133 and 134 are set so that the FET 131 is turned on when a large inrush current is settled, that is, when the voltage input to the sine wave adapter 1 rises to some extent. Has been. With this configuration, after the FET 131 is turned on, current flows from the first smoothing capacitor 112 to the FET 131 and does not flow to the inrush current preventing resistor 132. The on-resistance of the FET 131 is extremely small compared to the resistance value of the inrush current preventing resistor 132, so that power is hardly wasted by the FET 131.

  In addition, since the inverter device 2 has an overcurrent prevention function that stops the operation when a large current flows, the inverter device 2 also stops the operation even when a large inrush current occurs on the sine wave adapter 1 side. It becomes. However, in this embodiment, since the sine wave adapter 1 includes the inrush current prevention circuit 113, the inverter device 2 is prevented from stopping operation due to the inrush current generated on the sine wave adapter 1 side. Yes.

  The voltage detection circuit 114 includes voltage detection resistors 141 and 142 connected in series. The voltage detection resistor 141 is a voltage output from the rectifier circuit 111 and the first smoothing capacitor 112, that is, a charging voltage of the first smoothing capacitor 112. And 142 are output to the microcomputer 121.

  The auxiliary power supply 115 includes a three-terminal regulator 151 and oscillation prevention capacitors 152 and 153, and converts the voltage output from the rectifier circuit 111 and the first smoothing capacitor 112 into a predetermined DC voltage (for example, 5V). Then, it is supplied as a drive voltage to the microcomputer 121 or the like.

  The booster circuit 116 includes a coil 161, an FET 162, a switching IC 163, a rectifier diode 164, and voltage detection resistors 165 and 166.

  The voltage stored in the coil 161 is output in a pulse form when the switching IC 163 turns the FET 162 on and off. The pulse voltage is rectified and smoothed by the rectifier diode 164 and the second smoothing capacitor 117 and output as a DC voltage. In the present embodiment, as shown in FIG. 16 (e), a DC voltage of 141 V is output from the booster circuit 116 and the second smoothing capacitor 117. The voltage detection resistors 165 and 166 monitor the voltage of the second smoothing capacitor 117 and feed back to the switching IC 163. The switching IC 163 turns the FET 162 on and off so that the voltage of the second smoothing capacitor 117 is 141V.

  The inverter circuit 118 includes an inverter unit 181 and a filter unit (shaping circuit) 182.

  The inverter unit 181 includes four FETs 181a-181d. The drain of the FET 181a is connected to the cathode of the rectifier diode 164, and the source of the FET 181a is connected to the drain of the FET 181b. The drain of the FET 181c is connected to the cathode of the rectifier diode 164, and the source of the FET 181c is connected to the drain of the FET 181d. A second PWM signal for turning on / off the FET 181a-181d is input to the gate of the FET 181a-181d by the driver IC 120, and output from the booster circuit 116 and the second smoothing capacitor 117 by turning on / off the FET 181a-181d. The DC voltage thus converted is converted into a pulse wave voltage (FIG. 16 (f)).

  The filter unit 182 includes coils 182a and 182b and a capacitor 182c. The source of the FET 181a and the drain of the FET 181b are connected to the coil 182a, and the source of the FET 181c and the drain of the FET 181d are connected to the coil 182b. Yes. The pulse wave voltage output from the inverter unit 181 (FETs 181a-181d) is converted (shaped) into a sine wave voltage via the filter unit 182 (FIG. 16 (g)).

  The current detection resistor 119 is connected between the source of the FET 181 b and the source of the FET 181 d and GND, and the terminal on the high voltage side of the current detection resistor 119 is connected to the microcomputer 121. With such a configuration, the current detection resistor 119 detects the current flowing through the inverter circuit 118 (sinusoidal adapter 1) and outputs it as a voltage to the microcomputer 121.

  The microcomputer 121 performs on / off control of the switching IC 163 based on the voltage detected by the voltage detection circuit 114. The switching IC 163 controls the FET 162 so that a predetermined DC voltage (141 V in this embodiment) is output from the booster circuit 116 and the second smoothing capacitor 117, that is, the boost voltage of the second smoothing capacitor 117 is 141V. PWM control is performed.

  Further, the microcomputer 121 outputs a second PWM signal such that a pulse wave voltage having an effective value of 100 V is output from the inverter circuit 118 to the gates of the FETs 181a to 181d via the driver IC 120. In the present embodiment, the microcomputer 121 normally sets the FET 181a and FET 181d (hereinafter referred to as the first set), the FET 181b and FET 181c (hereinafter referred to as the second set) as one set, and the first set. A second PWM signal that alternately turns on and off the second set at a duty ratio of 100% is output. A second PWM signal is output to turn on / off each FET at a switching frequency of 20 kHz. At this time, the signal is output at an output frequency (50 Hz in FIG. 16F) set by a frequency switching circuit 122 described later.

  Furthermore, the microcomputer 121 according to the present embodiment performs input voltage monitoring, boosting necessity determination, and soft start when the operation of the sine wave adapter 1 is started.

  In the input voltage monitoring, when the maximum value of the rectangular wave voltage input from the inverter device 2 is out of the first range (input allowable range, 99 V or more and 169 V or less in this embodiment), the booster circuit 116 and the inverter The operation of the circuit 118 is stopped. Thereby, damage of elements, such as FET in the sine wave adapter 1, is suppressed. (Please enclose S6 and S7 in Fig. 20 with dotted lines for "input voltage monitoring" (same as step-up necessity determination))

  In determining whether or not boosting is required, the microcomputer 121 performs the operation of the boosting circuit 116 when the maximum value of the rectangular wave voltage is included in the second range (boost prohibition range, which is 127 V or more and 141 V or less in this embodiment). Stop. This prevents wasteful operation of the booster circuit 116 and waste of power.

  In the soft start, the current flowing through the inverter circuit 118 over a predetermined time (100 μs in this embodiment) immediately after the operation of the inverter circuit 118 is started is larger than a predetermined value (10 A in this embodiment). In this case, the duty of the second PWM signal is reduced to 50%, and then the duty is returned to 100% over 2.5 seconds. Thereby, it is suppressed that a large current flows in the sine wave adapter 1 and the inverter device 2.

  The frequency switching circuit 122 includes a switch 221 and an EEPROM 222. The frequency switching circuit 122 corresponds to the frequency setting unit of the present invention.

  The user can switch the frequency of the sine wave voltage output from the sine wave adapter 1 between 50 Hz and 60 Hz by pressing the switch 221 provided in the setting unit 13 for a predetermined time (for example, 3 seconds). it can. Specifically, since the HIGH level frequency switching signal is input from the frequency switching circuit 122 to the microcomputer 121 when the switch 221 is pressed, the microcomputer 121 switches the frequency of the sine wave voltage output from the sine wave adapter 1. Therefore, the second PWM signal is changed according to the frequency switching signal.

  The EEPROM 222 stores the frequency when the operation of the microcomputer 121 is stopped, that is, when the supply of power from the inverter device 2 is stopped. The microcomputer 121 has the frequency stored in the EEPROM 222 when the next operation starts. A corresponding second PWM signal is output.

The display unit 12 includes a transistor 231 and an LED 232. When the microcomputer 121 outputs a LOW signal, the transistor 231 is turned on and the LED 232 is lit or blinks.
Although not shown in FIG. 18, the transistor 231 actually includes a 50 Hz green lighting transistor, a 50 Hz red lighting transistor, a 60 Hz green lighting transistor, and a 60 Hz red lighting transistor. The LED 232 is a 50 Hz green LED connected to a 50 Hz green lighting transistor, a 50 Hz red LED connected to a 50 Hz red lighting transistor, a 60 Hz green LED connected to a 60 Hz green lighting transistor, and a 60 Hz red lighting. The microcomputer 121 includes a 60 Hz red LED connected to the transistor, and the microcomputer 121 outputs a signal for lighting the LED corresponding to the state of the sine wave adapter 1 to the display unit 12.

  Specifically, as shown in FIG. 19, when the frequency is set to 50 Hz by the frequency switching circuit 122, the 50 Hz green LED is turned on, and when the frequency is set to 60 Hz, the 60 Hz green LED is turned on. Let

  Further, when the current detected by the current detection resistor 119 is 4A or more, the red LED of the set frequency is turned on, and when the current is 5A or more, the red LED of the set frequency is blinked.

  Although not shown, a temperature detection means (for example, a thermistor) is arranged close to the FET 162, and when the temperature detected by the thermistor is 100 degrees or more, the set frequency is set. Make the green LED blink.

  Further, when the frequency is switched in the frequency switching circuit 122, the green and red LEDs of the set frequency are flashed for 3 seconds at a cycle of 0.5 seconds, and then flashed for 2 seconds at a cycle of 0.2 seconds. Then, only the green LED is turned on. In addition, when both green LED and red LED are lit, it will light orange.

  The fan mechanism 124 mainly includes a cooling fan 16 and a transistor 242, and the microcomputer 121 outputs an ON signal (HIGH signal) to the transistor 242 when driving power is supplied, thereby cooling the fan. 16 is operated.

  Here, with reference to the flowchart of FIG. 20, input voltage monitoring, boost necessity determination, and soft start by the microcomputer 121 will be described.

  The flowchart of FIG. 20 starts when the power of the inverter device 2 to which the sine wave adapter 1 is attached is turned on and driving power is supplied from the auxiliary power source 115 to the microcomputer 121.

  When the driving power is supplied, first, the microcomputer 121 determines whether or not a voltage greater than 120 V is input from the inverter device 2 for 0.5 s based on the voltage detected by the voltage detection circuit 114 ( S1).

  When a voltage higher than 120 V is not input for 0.5 s (S1: NO), the sine wave is not operated by operating the booster circuit 116, the cooling fan 16, and the inverter circuit 118 (S2-S4). The sine wave is not output from the adapter 1 (S5). As a result, a low voltage is input to the sine wave adapter 1, and damage to elements such as FETs in the sine wave adapter 1 is suppressed.

  On the other hand, when a voltage greater than 120 V is input for 0.5 s (S1: YES), the input voltage falls within the first range of 99 V or more and 169 V or less based on the voltage detected by the voltage detection circuit 114. It is determined whether or not it is present (S6, S7).

  When the input voltage is not within the first range (S6 or S7: YES), the sine wave adapter 1 is not operated by not operating the booster circuit 116, the cooling fan 16, and the inverter circuit 118 (S2-S4). So that a sine wave is not output from (S5).

  On the other hand, when the input voltage is in the first range (S6 and S7: NO), it is determined whether or not the input voltage is in the second range greater than 127V and smaller than 141V (S8, S9).

  When the input voltage is not within the second range (S8 or S9: NO), the booster circuit 116 is operated (S10), and then the cooling fan 16 is operated (S11).

  On the other hand, when the input voltage is in the second range (S8 and S9: YES), the cooling fan 16 is operated without operating the booster circuit 116 (S11). In this case, the voltage output from the rectifier circuit 111 and the first smoothing capacitor 112 is input to the inverter circuit 118 as it is. In addition, when the time when the input voltage enters the second range continues for a predetermined time (for example, 0.5 seconds), it is determined that the input voltage is within the second range. This is to ensure that a sine wave voltage having an effective value of 100 V can be output in consideration of a case where the input voltage increases or decreases excessively.

  Subsequently, after the operation of the inverter circuit 118 is started (S12), based on the current value detected by the current detection resistor 119, it is determined whether or not a current larger than 10 A has flowed into the inverter circuit 118 for 100 μs. (S13).

  When a current larger than 10 A has flowed through the inverter circuit 118 for 100 μs (S13: YES), a soft start is performed. That is, once the duty of the second PWM signal is lowered to 50% (S14), as shown in FIG. 21, the duty is returned to 100% over 2.5 seconds (S15, S16).

  On the other hand, if a current greater than 10 A has not flowed through the inverter circuit 118 for 100 μs (S13: NO), a sine wave voltage is output with a duty of 100% (S17).

  As described above, in the sine wave adapter 1 according to the present embodiment, when the maximum value of the input voltage is included in the second range (127 V or more and 141 V or less in the present embodiment), the voltage is boosted. Since the operation of the circuit 116 is stopped, it is possible to prevent the booster circuit 116 from operating unnecessarily and wasting power.

  On the other hand, when the maximum value of the input voltage is not included in the second range (127 V or more and 141 V or less in the present embodiment), the booster circuit 116 is operated, so that the voltage of the lead storage battery 3 has decreased. For this reason, even when a rectangular wave voltage having a maximum value different from 141 V is output from the inverter device 2, a sine wave voltage having an effective value of 100 V can be output from the sine wave adapter 1. Thus, it is possible to suppress the occurrence of a failure in a precision instrument or the like connected to the sine wave adapter 1.

  Further, when the maximum value of the input voltage is out of the first range (in this embodiment, 99V or more and 169V or less), the operations of the booster circuit 116 and the inverter circuit 118 are stopped, so the sine wave adapter 1 Damage to elements such as the FET is suppressed.

  In addition, since the sine wave adapter 1 according to the present embodiment includes the frequency switching circuit 122, it can be used, for example, in both Kanto and Kansai where the frequency of the commercial power supply is different.

  Next, a sine wave adapter 200 according to the second embodiment of the present invention will be described with reference to FIGS.

  The sine wave adapter 200 according to the present embodiment is characterized in that when the input waveform is a sine wave, the booster circuit 116 and the inverter circuit 118 are output as they are without being operated, and FIG. As shown in FIG. 2, a waveform discrimination circuit 125 and a bypass circuit 126 are provided. The waveform discrimination circuit 125 corresponds to the waveform discrimination unit of the present invention.

  The waveform determination circuit 125 mainly includes a rectifier diode 251, voltage dividing resistors 252 and 253, and a transistor 254.

  If it is assumed that the sine wave voltage 200 shown in FIG. 23A is input to the sine wave adapter 200, the input voltage is rectified by the rectifier diode 251, and the rectified voltage is divided. The voltage divided by the voltage resistors 252 and 253 is input to the base of the transistor 254 (FIG. 23B). While the divided voltage input to the base exceeds the ON voltage of the transistor 254 (dotted line in FIG. 23C), the transistor 254 is turned on. As a result, a LOW level signal is input to the microcomputer 121 while the transistor 254 is on, and a HIGH level determination signal is input while the transistor 254 is off (FIG. 23 (d)). Since the sine wave voltage and the rectangular wave voltage have different T1 (HIGH signal time) and T2 (HIGH signal time + LOW signal time), the microcomputer 121 is input to the sine wave adapter 200 based on T1 and T2. It is determined whether the measured voltage is a sine wave or a rectangular wave.

  Specifically, the microcomputer 121 determines that the voltage input to the sine wave adapter 200 is a rectangular wave when T1 is about half of T2, and if T1 is sufficiently smaller than T2, the sine It is determined that the voltage input to the wave adapter 200 is a sine wave.

  The bypass circuit 126 includes a relay circuit 261 and a transistor 262.

  The relay circuit 261 mainly includes a relay 261a connected between the input terminal A and the output terminal B of the sine wave adapter 200, and a coil 261b disposed in the vicinity of the relay 261a. One end of the coil 261 b is connected to the power source, and the other end is connected to the collector of the transistor 262.

When the microcomputer 121 determines that a sine wave voltage is input based on the determination signal from the waveform determination circuit 125, the microcomputer 121 outputs an ON signal (HIGH signal) to the base of the transistor 262. As a result, the transistor 262 is turned on and flows to the coil 262b, whereby the relay 261a is closed and the sine wave voltage input to the input terminal A is output from the output terminal B without passing through the booster circuit 116 and the inverter circuit 118. It will be.
This operation will be described with reference to the flowchart of FIG. When the drive power is supplied, as shown in FIG. 22B, it is determined whether the voltage input to the input terminal A by the waveform determination circuit 125 and the microcomputer 121 is a sine wave or a rectangular wave (S50). In the case of the rectangular wave (S50: YES), the frequency set by a frequency switching circuit (not shown) (frequency switching circuit 122 in FIG. 18A) is determined (S51), and the inverter circuit 118 is set according to the set frequency. Are set (S52, S53). Thereafter, the bypass circuit 126 is turned off (S54), and when a predetermined time (for example, 5 seconds) elapses until the bypass circuit 126 is reliably turned off (S55), the booster circuit 116 and the inverter circuit 118 are driven (S56).
On the other hand, when the input voltage is a sine wave (S50: NO), the frequency is determined from the time T2 shown in FIG. 22B (S57). If the frequency is not 50 Hz or 60 Hz (S57: NO), for example, the frequency of the input voltage is obtained by the equation 1 / T2, so if the calculated frequency is 55 Hz, for example, it is a rectangular wave Re-determine and perform the processing from S51. When the frequency is 50 Hz or 60 Hz (S57: YES), the booster circuit 116 and the inverter circuit 118 are stopped (S58), and a predetermined time (for example, 5 seconds) until the booster circuit 116 and the inverter circuit 118 are reliably stopped. When the time has elapsed (S59), the bypass circuit 126 is turned on (S60).

  As described above, in the sine wave adapter 200 according to the present embodiment, when a sine wave voltage is input, the voltage is output as it is without operating the booster circuit 116 and the inverter circuit 118. Waste is suppressed. In this embodiment, the sine wave voltage and the rectangular wave voltage are discriminated, but in addition to these, the DC voltage may be discriminated. In the case of a DC voltage, the operation may be performed in the same manner as the rectangular wave voltage flow. That is, the sine wave adapter 200 is configured to always output a sine wave regardless of the voltage waveform such as a rectangular wave voltage or a DC voltage.

  Next, a sine wave adapter 300 according to the third embodiment of the present invention will be described with reference to FIG.

  The sine wave adapter 300 according to the present embodiment is characterized in that the output voltage can be switched. As shown in FIG. 24, a voltage switching resistor 127, a voltage switching FET 128, and a voltage switching circuit 129 are provided. I have.

  The voltage switching resistor 127 and the voltage switching FET 128 are connected in parallel with the voltage detection resistor 166 of the booster circuit 116 in a state of being connected in series.

  The voltage switching circuit 129 includes a switch 291 and an EEPROM 292. The user can switch the effective value of the sine wave voltage output from the sine wave adapter 300 between 100 V and 230 V by pressing the switch 291 for a predetermined time (for example, 3 seconds). Further, if the switched (set) voltage is stored in the EEPROM 292, the set voltage can be maintained even when the power supply to the sine wave adapter 300 is lost. The voltage switching circuit 129 corresponds to the voltage setting unit of the present invention.

  Specifically, when the switch 291 is pressed, a high-level voltage switching signal is input from the voltage switching circuit 129 to the microcomputer 121, so that the microcomputer 121 turns on the voltage switching FET 128 according to the voltage switching signal. When the voltage switching FET 128 is turned on, the divided voltage input to the switching IC 163 changes. When this partial pressure change occurs, the switching IC 163 switches the effective value of the sine wave voltage output from the sine wave adapter 300 between 100 V and 230 V by changing the on / off duty of the FET 162. be able to. In addition, you may make it switch to voltages other than 100V and 230V. In this case, the same set as the resistor 27 and the FET 28 may be connected in parallel with the voltage detection resistor 166, and the FET corresponding to the desired voltage may be turned on in accordance with the pressing time of the switch 291.

  As described above, since the output voltage can be changed in the sine wave adapter 300 according to the present embodiment, for example, it can be used overseas where the voltage of the commercial power supply is different.

  Subsequently, a sine wave adapter 400 according to a fourth embodiment of the present invention will be described with reference to FIG.

  The sine wave adapter 400 according to the present embodiment performs overcurrent control.

  Specifically, as shown in FIG. 25, when the current detected by the current detection resistor 119 is larger than a predetermined value (5A in the present embodiment) (S21: YES), the microcomputer 121 first sets the first 2 is reduced (S22). If the current detected by the current detection resistor 119 has not decreased to a predetermined value or less after a predetermined time (10 s in this embodiment) has elapsed (S23: YES), the inverter A second PWM signal that stops the circuit 118 is output (S25).

  As described above, in the sine wave adapter 400 according to the present embodiment, since a large current is suppressed from flowing through the inverter circuit 118, the FET 181a-181d configuring the inverter circuit 118 is prevented from being damaged. Yes. When the inverter circuit 118 stops due to an overcurrent, it is possible to grasp that the output has stopped due to the overcurrent by blinking the red LED corresponding to the set frequency as shown in FIG.

  FIG. 28 shows the fifth embodiment. In the fifth embodiment, the structure related to drainage inside the sine wave adapter 1 is different from the above-described embodiment.

  In the fifth embodiment, in addition to the drain port 10c, the second drain port 110c is formed adjacent to the drain port 10c. Further, the second partition 110 </ b> A is erected downward from the upper surface of the inner surface of the housing 10, slightly spaced from the partition 10 </ b> A in the left-right direction. Further, the third partition 110 </ b> B is erected upward from the bottom surface of the inner surface of the housing 10, slightly spaced from the second partition 110 </ b> A in the left-right direction. The second drain port 110c is formed between the partition wall 10A and the third partition wall 110B. Thereby, even if the water from the outside gets over the partition 10A, it can be discharged to the outside through the second exhaust port 110b. Such a labyrinth structure prevents water that has entered from the air inlet 10a from entering the inside. The exhaust port 10b has a structure similar to that shown in FIG.

In the present invention, the sine wave adapter 1 and the inverter device 2 are provided separately. Depending on the user, it may be possible to use only a device driven by a rectangular wave AC voltage. In this case, if the output of the inverter device 2 is a rectangular AC voltage, it is possible to deal with such a user. In order to obtain a sine wave AC voltage, a filter circuit unit is required after DC is converted into AC by the inverter unit in the inverter device 2. This is a circuit that shapes a rectangular waveform into a sine waveform. Since this circuit is composed of a plurality of coils and capacitors, the cost becomes high, and a cost burden is increased for a user who can deal with only a rectangular wave.
Furthermore, even if it is possible to switch between the sine wave and the rectangular wave in the inverter device 2, it is necessary to provide a switching unit in addition to the filter circuit unit, which increases the cost burden.
Therefore, the present invention provides a sine wave adapter 1 that can output a sine wave by connecting to an inverter device 2 that outputs a rectangular wave, so that only a necessary user uses the sine wave adapter 1. Therefore, it is possible to reduce the economic burden on users who are not required. Further, if the sine wave adapter 1 can be fixed to the inverter device 2, the size can be suppressed, and the sine wave adapter 1 and the inverter device 2 can be used integrally, thereby improving portability and operability. it can.

  The power supply device according to the present invention is not limited to the above-described embodiments, and various improvements and modifications can be made within the scope described in the claims.

  In the first embodiment, the circuit board 17 is filled with the urethane 17A for waterproofing, dustproofing and vibration proofing, but the resin used is not limited to urethane. For example, silicon may be used.

  As shown in FIG. 27, the operation of the inrush current prevention circuit 13 may be controlled by the microcomputer 21. In this case, the microcomputer 21 monitors the input voltage by the voltage detection circuit 40, and as shown in FIG. 13, when a voltage greater than 120V is input from the inverter device 2 for 0.5 s (S1: YES). ), An on signal is output to the gate of the FET 131 to operate the inrush current prevention circuit 13 (S1B). On the other hand, when the voltage is smaller than 120 V (S1: NO), the microcomputer 21 outputs an OFF signal to the gate of the FET 131 and stops the inrush current prevention circuit 13 (does not operate). Since the voltage dividing resistors 133 and 134 of the inrush current preventing circuit 13 in FIG. 4A can be omitted, the cost can be suppressed.

  In the third embodiment, the boost voltage may be switched by detecting the change in the feedback voltage of the second smoothing capacitor 17 by the switching IC 163 without providing the voltage switching resistor 27 and the voltage switching FET 28. Further, the microcomputer 21 may directly control the switching IC 163 when a voltage switching signal is input.

  Moreover, in the said embodiment, 99V or more and 169V or less were used as the 1st range, and 127V or more and 141V or less were used as the 2nd range, However, It is not limited to these.

  15 and 16, the lead storage battery 3 and the battery pack 5 (lithium ion battery) are used as the power source connected to the inverter device 2 via the adapter 4. However, the inverter device 2 has various types. Different batteries, for example, nickel-cadmium batteries and nickel metal hydride batteries may be connected, and the battery voltages may be different.

  In the above embodiment, the output from the sine wave adapter 1 is stopped by both the first PWM signal and the second PWM signal. However, the output from the sine wave adapter 1 is stopped only by the second PWM signal. It may be configured to stop. When the booster circuit 16 is a transformer, the output from the sine wave adapter 1 may be stopped only by the first PWM signal.

  The sine wave adapter 1 may be directly supplied with a DC voltage from the battery pack 5, for example. Even in this case, the sine wave adapter 1 can output a sine wave.

  Further, in the first embodiment, water intrusion is prevented by one partition 10A, and intrusion of water is prevented by three partitions 10A, second partition 110A, and third partition 110B in the fifth embodiment. The number of partition walls is not limited to this.

1 ·· Sine wave adapter 2 · Inverter device 3 · Battery pack 3A · Adapter 10 · Case 10a · Inlet 10b · Exhaust port 10c · Drain port 11 · Engagement portion 14 · Output Cable 16 ·· Cooling fan 22 · · Output cable 25 · · Power input unit 114 · · Voltage detection circuit 116 · · Boosting circuit 119 · · Current detection resistor 121 · · Microcomputer 122 · · Frequency switching circuit 125 · · Waveform discrimination circuit 126 .. Bypass circuit 129.. Voltage switching circuit 181.. Inverter unit 182.

Claims (19)

An input section to which voltage is input;
An inverter circuit for converting the waveform of the voltage into a sine waveform;
An output unit that outputs the voltage of the sine waveform;
A waveform converter characterized by comprising: A substantially box-shaped housing having a top surface, a bottom surface, and a side surface;
2. The waveform converter according to claim 1, wherein the housing is provided with an inverter device fixing portion capable of fixing the inverter device for supplying the input voltage. The inverter device converts a DC voltage into a rectangular wave AC voltage and outputs it,
2. The waveform converter according to claim 1, wherein the rectangular wave AC voltage is converted into a sine wave AC voltage and output.   The waveform converter according to claim 2, wherein the inverter device fixing portion is provided on an upper surface of the housing. The inverter device converts a DC voltage from the power tool battery pack into an AC voltage and outputs the AC voltage,
The waveform converter according to claim 2 or 4, wherein the inverter device connected to the battery pack for the electric tool can be fixed to the inverter device fixing portion. On one side surface of the housing, an input / output terminal directed outward from the housing is provided,
The inverter device includes a substantially box-shaped inverter housing having a top surface, a bottom surface, and a side surface, and one side surface of the inverter housing is provided with an inverter input / output terminal directed outward from the inverter housing;
The inverter device has four side surfaces of the inverter housing such that the bottom surface of the inverter housing faces the top surface of the housing and the one side surface of the inverter housing corresponds to the one side surface of the housing. The waveform converter according to claim 2 or 4, wherein the waveform converter is fixed to the inverter device fixing portion in a positional relationship corresponding to four side surfaces of the housing. The inverter device has an engaging portion that engages with the inverter device fixing portion,
The waveform converter according to claim 6, wherein the engaging portion and the input / output terminal are provided on different surfaces. A booster circuit that boosts the input voltage;
A control unit for controlling the booster circuit and the inverter circuit;
A voltage detection unit for detecting a voltage input to the input unit;
Further comprising
3. The waveform converter according to claim 2, wherein the control unit prohibits the boosting operation when the voltage detected by the voltage detection unit is within a boost prohibition range. The inverter circuit
An inverter for converting the output voltage of the booster circuit into a pulse wave;
A shaping unit for shaping the pulse wave into a sine wave;
With
9. The waveform according to claim 8, wherein the control unit operates the inverter circuit without operating the booster circuit when the voltage detected by the voltage detection unit is within the boost prohibition range. converter.   The control unit prohibits the operation of at least one of the booster circuit and the inverter circuit when the voltage detected by the voltage detection unit is out of an input allowable range. The waveform converter described in 1. A current detector for detecting a current flowing through the inverter circuit;
11. The control unit according to claim 8, wherein the control unit controls the inverter circuit so that a voltage output from the inverter circuit decreases when a current flowing through the current detection unit is equal to or greater than a predetermined value. The waveform converter according to claim 1. A frequency setting unit capable of setting the frequency of the voltage output from the output unit;
12. The control unit according to claim 8, wherein the control unit controls the inverter circuit such that a voltage having a frequency set by the frequency setting unit is output from the output unit. Waveform converter. A voltage setting unit capable of setting a voltage output from the output unit;
The waveform conversion according to any one of claims 8 to 12, wherein the control unit controls the booster circuit so that the voltage set by the voltage setting unit is output from the output unit. vessel. A waveform discriminating unit for discriminating the waveform of the voltage input to the input unit;
A bypass circuit connected between the input unit and the output unit and capable of being turned on and off;
Further comprising
14. The waveform conversion according to claim 8, wherein the control unit turns on the bypass circuit when the waveform detected by the waveform determination unit is a sine wave. vessel.   15. The waveform converter according to claim 14, wherein the control unit prohibits at least the operation of the inverter circuit when the waveform detected by the waveform discrimination unit is a sine wave. The housing is formed with a through hole that communicates the inside and the outside of the housing,
A shielding wall is provided in a portion of the housing that faces the through hole,
A drainage space is formed between the shielding wall and the portion of the housing in which the through hole is formed, and a lower portion of the drainage space is defined by a bottom surface, and a bottom surface portion that defines a lower portion of the drainage space includes: The waveform converter according to any one of claims 2 to 15, wherein a drainage through hole is formed to communicate the inside and the outside of the housing.   A circuit board having a voltage conversion circuit for converting a rectangular wave AC voltage into a sine AC voltage and outputting the sine AC voltage, the entire circuit board being covered with a resin material, The waveform converter according to any one of claims 1 to 16. A box-shaped main body with an opening formed at one end;
A lid provided on the main body so that the opening can be opened and closed;
A lead storage battery housed in the main body,
The inverter device capable of being supplied with a DC voltage from the lead-acid battery via an adapter;
With
A power supply apparatus, wherein the main body portion can accommodate the waveform converter according to any one of claims 1 to 17. The inverter device can be fixed to the lid,
The power supply according to claim 18, wherein the waveform converter and the inverter device can be connected in a state where the inverter device is fixed to the lid and the waveform converter is accommodated in the main body. apparatus.

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