JP3193467U - Inverter generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a low-cost inverter which does not need to replace a control unit entirely for each substrate when the voltage value of a single-phase or three-phase AC output of an inverter generator is significantly changed according to an AC power source of an export destination country. Provide an opportunity. Since the only element that converts the voltage value of the AC output of an inverter generator is the resistance value of some circuits in the control unit, module resistances 50 of various values are prepared, and a control unit is required. Only the resistor was modularized, and the modularized connector 42 was attached to and detached from the printed circuit board 44 of each circuit. [Selection diagram] Fig. 4

Description

  This invention relates to an inverter generator. More specifically, a part of a control unit in the inverter generator is modularized, and the value of the AC voltage output from the inverter generator can be easily changed by simply replacing the module with another module. It is something that can be done.

  A number of forms are known for private power generation that obtains power independently from the power company. Regardless of the type of in-house power generation, if the load connected to the supplied power is a heating element such as an electric light or an electric heater, it is sufficient if the specified voltage and current are secured for the power, and the power frequency Variations in are generally not considered a problem.

  However, when the load connected to the supplied power is a rotating device such as a motor, a fluorescent lamp, or a personal computer, it is required that the power frequency does not vary and is stable. For example, since many of the recent motor rotation controls depend on the power supply frequency, the frequency needs to be accurate and unaltered. In response to this request, as a stationary private generator or portable generator, the converter converts the three-phase alternating current generated by the three-phase generator into direct current with a converter, and then converts this direct current into three-phase alternating current or single Inverter generators that convert to phase alternating current have been put into practical use. The inverter has a commutation control circuit that turns off direct current to turn it into alternating current, and the circuit performs alternating current turn-off and turn-on (switching) at a desired cycle, thereby obtaining alternating current at a desired frequency. In order to obtain an accurate and stable frequency, pulse width modulation (PWM) control using a reference sine wave is performed.

  Since the present invention relates to improvements in the converter and the circuit for controlling the inverter that form the main part of the inverter generator, the basic configuration of the inverter generator will be described first. In FIG. 1, reference numeral 10 indicates a three-phase generator having three armature windings U, V, and W arranged at a phase angle of 120 degrees. The three-phase generator 10 is driven by a rotation source (not shown) such as an engine to generate a three-phase alternating current.

  Three-phase alternating current from the three-phase generator 10 is input to a converter 14 provided with a rectifier such as a thyristor or triac, and is converted into direct current by the converter 14. The converted direct current is smoothed by the capacitor 15 and then converted into a single-phase alternating current by the inverter 20. The inverter 20 is formed of a self-extinguishing type switching element such as an IGBT (insulated gate bipolar transistor) or a power MOSFET, for example, and drives the gate to turn off and turn on (switch) the direct current. Convert to phase alternating current. The obtained single-phase alternating current is output to the U1 phase end and the V1 phase end via the smoothing filters 30 connected in series to the inverter 20.

  The electric elements of the three-phase generator 10, the converter 14, and the inverter 20 are electrically controlled by various circuits built in the control unit 35. That is, the power supply circuit 41 in the control unit 35 is connected to the U phase and the O phase of the three-phase generator 10 to receive AC power supply, and after the voltage drop and DC exchange are performed in the power supply circuit 41, DC power is supplied to various circuits of the control unit 35. The DC voltage control circuit 37 controls the DC voltage when it is converted from AC to DC by the inverter 20 so that it is within a certain range. The DC voltage control circuit 37 includes a resistor (DC voltage setting resistor) for setting the DC voltage converted by the inverter 20 to a desired value in the substrate. This resistor is a module as will be described later. Can be exchanged.

  The gate of the self-extinguishing switching element built in the inverter 20 is driven by an inverter drive circuit 22. For example, the inverter drive circuit 22 includes a pulse width modulation (PWM) circuit, and receives an input of a composite signal in which a sine wave of a reference frequency made from a data signal for a sine wave and a carrier wave (triangular wave) are superimposed, Here, the pulse width-modulated pulse opens and closes the gate of the self-extinguishing type switching element to perform commutation control. In FIG. 1, a reference sine wave signal circuit 26 generates a data signal necessary to generate a sine wave having a desired frequency as a reference. Actually, there are eight output lines for sending the data signal from the reference sine wave signal circuit 26, but in FIG. 1 to FIG. 3, only one is displayed. A data signal for creating a sine wave from the reference sine wave signal circuit 26 is input to a sine wave conversion circuit 24 connected to the circuit 26. The sine wave conversion circuit 24 generates a desired reference sine wave using the data signal. The reference sine wave is output-compared with a carrier wave (triangular wave set at a higher frequency than the reference sine wave) generated by the carrier wave generation circuit 31 to form a superimposed synthesized signal, and the synthesized signal Is input to the inverter drive circuit 22. The reference sine wave signal circuit 26 includes a resistor (reference sine wave voltage setting resistor) for setting a voltage for setting the reference sine wave to a desired value in the substrate, and this resistor will be described later. It can be replaced as a module.

  The three-phase generator 10 in FIG. 1 includes single armature windings U, V, and W, and finally outputs a single-phase alternating current. In this regard, the three-phase generator 10 of the inverter generator shown in FIG. 2 has a master armature winding 10a and a slave armature winding 10b, and finally outputs a three-phase alternating current. The other basic configuration is the same as that of the inverter generator of FIG. However, the converter includes a first converter 16 that converts the three-phase alternating current generated by the master winding 10a into direct current, and a second converter 18 that converts the three-phase alternating current generated by the slave winding 10b into direct current. Is done. Each direct current from the first and second converters 16 and 18 is converted into a three-phase alternating current in the inverter 20. The obtained three-phase alternating current is output to the U1 phase end, the V1 phase end, and the W1 phase end via each smoothing filter 30. Further, since the three-phase alternating current consists of three sine waves having a time difference, a timing signal for determining this time difference is required. Therefore, the timing signal is generated by the reference sine wave signal circuit 26 of FIG.

  The three-phase generator 10 having the master armature winding 10a and the slave armature winding 10b shown in FIG. 2 has a neutral point 0 independent of the U1 phase end, the V1 phase end, and the W1 phase end described above. ing. The neutral point 0 is connected to a line 13 that connects the anode side of the first converter 16 and the cathode side of the second converter 18. The first converter 16 and the second converter 18 are individually connected to a DC voltage control circuit 37 for driving a semiconductor switching device (for example, a thyristor) incorporated in each of the first converter 16 and the second converter 18. The control circuit 37 controls the output DC voltage.

  As shown in FIG. 2, two DC voltage sources, a first converter 16 connected to the master armature winding 10a and a second converter 18 connected to the slave armature winding 10b, are provided. A system in which the intermediate point of the sources 16 and 18 is set to the neutral point 0 is referred to as a three-phase four-wire system. In this three-phase four-wire inverter generator, a gate control circuit (not shown) can control the voltages of the corresponding DC voltage sources 16 and 18 to be constant. Therefore, for example, when only the U1 phase end and the neutral point 0 are connected to obtain a single-phase output, there is a disadvantage that an unbalanced load is applied to the other V1 phase end and the W1 phase end. However, according to the configuration of FIG. 2, even if an unbalanced load is applied, the DC voltages from the two DC voltage sources 16 and 18 balance each other, so that the three-phase AC voltage is well balanced. By providing two DC voltage sources in this way, the output voltages of the master armature winding 10a and the slave armature winding 10b can be suppressed to ½. In addition, the device design has the advantage that the pressure resistance can be lowered and the advantage that the manufacturing cost can be suppressed.

  Next, FIG. 3 has the same basic structure as that of the inverter generator shown in FIG. 2, but the AC output is not a three-phase but a single phase. That is, the alternating current output from the inverter 20 is single-phase, and this single-phase alternating current is output to the U1 phase end and the V1 phase end. Therefore, the W1 phase end shown in FIG. This is because the self-extinguishing type switching element incorporated in the inverter 20 is only for two phases, and the gate control of the switching element by the inverter drive circuit 22 is performed only for the two phases. 2 and 3, the power supply circuit 41, the DC voltage control circuit 37, and the voltage feedback circuit 39 are built in the control unit 35. The inverter generator shown in FIG. Same as the configuration.

JP 2008-2370099 A

  The inverter generator shown in FIGS. 1 to 3 converts a three-phase alternating current generated by a three-phase alternating current generator driven by a rotation source such as an engine into a direct current with a converter, and then converts the direct current into an alternating current with an inverter. By performing appropriate electrical control to the inverter and converter by the control unit, it is extremely excellent in that a three-phase alternating current or a single-phase alternating current having an accurate and stable frequency can be obtained.

  However, an inverter generator is a single power generation unit that is compactly integrated by incorporating a rotation source such as an engine, etc., and is excellent in portability and suitable for use in places where the power supply environment is not well established. Widely exported not only to use but also overseas. By the way, the commercial AC voltage in Japan is 100V, and the industrial three-phase AC voltage is 200V. However, the values of the commercial AC voltage overseas and the three-phase AC voltage for factory use differ greatly from country to country. For example, the AC voltage for consumer use abroad is various, such as nominal 110V, 115V, 220V, 230V, 240V. Furthermore, industrial three-phase alternating current is also varied in various countries and regions, such as nominal 208V, 346V, 380V, 400V, 415V.

  For this reason, it is necessary for the manufacturer of the inverter generator to adjust and ship the single-phase or three-phase AC voltage output from the inverter generator to the specification of the destination country according to the power supply situation of the destination country when exporting it overseas. is there. For example, when exporting to India, there are 230V and 240V for single-phase AC 2 wires, and 400V and 415V for three-phase AC 4 wires. In this case, a difference of about 10V AC in the single phase and a difference of about 15V AC in the three phases can be dealt with by variably operating a potentiometer or a dip switch mounted on the control circuit of the inverter generator. However, for example, in a control unit of an inverter generator having a specification that outputs a commercial AC voltage of 100 V in Japan, in order to be able to correspond to a commercial AC voltage of 230 V at a destination, the control unit board itself is set for 230 V. It must be prepared and replaced separately. That is, as a control unit, it is necessary to prepare a board suitable for a commercial AC voltage (for example, 115 V, 230 V, etc.) in each overseas destination country, in addition to a 100 V AC specification board for domestic use. However, since there are many export destination countries, and the number of exports to each destination country is variable, stocking all the boards according to the AC voltage of each destination country increases the board manufacturing cost. However, it is pointed out that the inventory management becomes complicated.

  The present invention has been proposed in order to solve such a conventional inconvenience, and the control unit of the inverter generator is a common substrate in domestic and overseas destination countries, and greatly changes the AC output voltage. Only the necessary elements are modularized so that they can be removed and replaced in the control unit according to each country of destination. That is, it is necessary to greatly change the AC output of the inverter generator because of the DC voltage setting resistance in the control unit, the voltage setting resistance of the reference sine wave, and the feedback value setting resistance in each circuit in the control unit. Resistors of various values are individually incorporated in modules such as connectors, and replaced with the required module resistance as necessary, so that the control unit board can be completely converted, or a large number of the boards can be classified by destination country. This eliminates the waste of inventory.

In order to overcome the above-mentioned problems and achieve the intended purpose, an inverter generator according to claim 1 of the present application provides:
A three-phase generator that is driven by a rotation source to generate a three-phase alternating current, and a converter that converts the three-phase alternating current generated by the three-phase generator into a single-phase alternating current and a control unit that electrically controls the inverter In the inverter generator
The setting of various voltages in the control unit is performed by changing the resistance value in each corresponding circuit,
The gist of the modification is that the resistance value is changed by attaching and detaching module resistances of various resistance values prepared separately to each required circuit.

In order to overcome the above-mentioned problem and achieve the intended purpose, an inverter generator according to claim 2 of the present application is
A three-phase generator that is driven by a rotation source to generate a three-phase alternating current, and a control unit that electrically controls the conversion of the three-phase alternating current generated by the three-phase generator into a single-phase alternating current,
The control unit includes a converter that converts three-phase alternating current generated by the three-phase generator into direct current, an inverter that converts direct current from the converter into single-phase alternating current, and a direct-current voltage value converted by the converter. DC voltage control circuit for controlling, inverter driving circuit for driving a self-extinguishing switching element in the inverter, a reference sine wave signal circuit for generating a data signal for generating a reference sine wave, and a reference based on the data signal A sine wave conversion circuit for generating a sine wave, a carrier wave generation circuit for generating a carrier wave having a frequency higher than that of the reference sine wave, and a voltage feedback circuit for monitoring and maintaining a constant single-phase AC voltage output from the inverter And consist of
The self-extinguishing switching element is driven by a pulse obtained by pulse-width-modulating a mixed waveform obtained by superimposing the reference sine wave and the carrier wave, and a single-phase alternating current having a desired frequency is output from the inverter. In the inverter generator that outputs
The setting of the DC voltage in the DC voltage control circuit, the setting of the reference sine wave voltage in the reference sine wave signal circuit, and the setting of the feedback voltage in the voltage feedback circuit are all performed by changing the resistance value of each circuit,
The gist of the modification is that the resistance value is changed by attaching and detaching module resistances of various resistance values prepared separately to each required circuit.

Furthermore, in order to overcome the above-mentioned problems and achieve the intended purpose, an inverter generator according to claim 3 of the present application comprises:
A three-phase generator having a master winding and a slave winding, which is driven by a rotation source to generate a three-phase alternating current, and the three-phase alternating current generated by the three-phase generator into a single-phase or three-phase alternating current In an inverter generator comprising a converter for conversion and a control unit for electrically controlling the inverter,
The setting of various voltages in the control unit is performed by changing the resistance value in each corresponding circuit,
The gist of the modification is that the resistance value is changed by attaching and detaching module resistances of various resistance values prepared separately to each required circuit.

In order to overcome the above-mentioned problem and achieve the intended purpose, an inverter generator according to claim 4 of the present application is
A three-phase generator having a master winding and a slave winding, which is driven by a rotation source to generate a three-phase alternating current from each winding, and a three-phase alternating current generated by the three-phase generator in a single phase or a three-phase And a control unit for electrically controlling the conversion to alternating current,
The control unit includes a first converter that converts the three-phase alternating current generated by the master winding into direct current, a second converter that converts the three-phase alternating current generated by the slave winding into direct current, first and second An inverter for converting each direct current from the converter into a three-phase alternating current, a direct-current voltage control circuit for controlling the direct-current voltage converted by the first converter and the second converter, and a self-extinguishing switching element in the inverter An inverter driving circuit for driving, a reference sine wave signal circuit for generating a data signal for generating a reference sine wave, a sine wave conversion circuit for generating a reference sine wave based on the data signal, and a frequency higher than the reference sine wave A carrier wave generation circuit that generates a single carrier wave and a single-phase or three-phase AC voltage output from the inverter are monitored and held constant. It consists of a voltage feedback circuit,
The self-extinguishing switching element is driven by a pulse obtained by pulse-width-modulating a mixed waveform obtained by superimposing the reference sine wave and the carrier wave, and a single phase of a desired frequency is output from the inverter. In an inverter generator that outputs three-phase alternating current,
The setting of the DC voltage in the DC voltage control circuit, the setting of the reference sine wave voltage in the reference sine wave signal circuit, and the setting of the feedback voltage in the voltage feedback circuit are all performed by changing the resistance value of each circuit,
The gist of the modification is that the resistance value is changed by attaching and detaching module resistances of various resistance values prepared separately to a required circuit.
According to the devices according to claims 1 to 4 described above, by selecting a module resistor having an appropriate resistance value, the AC voltage output from the inverter generator can be easily changed without replacing the substrate of the control unit. be able to.

  According to the inverter generator according to the present invention, only the elements necessary for greatly changing the AC output voltage are modularized, and can be exchanged in the control unit according to each destination country. It is possible to completely change the substrate of the control unit or eliminate the waste of preparing and stocking a large number of the substrates for each destination country.

It is a whole circuit diagram of the inverter generator which outputs the single phase alternating current by which this invention is implemented. It is a whole circuit diagram of the inverter generator which outputs the alternating current of the three-phase four-wire with which this invention is implemented. It is a whole circuit diagram of the inverter generator which outputs the alternating current of the single phase three wire in which this invention is implemented. FIG. 3 is a longitudinal explanatory view showing a configuration in which a modular connector according to an embodiment can be attached to and detached from a printed circuit board of each circuit and replaced with a module resistor (connector) having a required resistance value. FIG. 5 is a partially longitudinal explanatory view showing a state where the connector shown in FIG. 4 is mounted on a printed board by pin connection.

  The present invention prepares a necessary number of connectors in which various resistance values, which are circuit elements necessary for greatly changing a single-phase or three-phase AC output, are prepared for a control unit in an inverter generator. Resistor) can be attached to and detached from the required part of the control unit. Since the inverter generator and the control unit in which this device is implemented are as described with reference to FIGS. 1 to 3, the description of the above-described configuration will be omitted, and only the modular resistance will be described. This description corresponds to any of the single-phase two-wire system in FIG. 1, the three-phase four-wire system in FIG. 2, and the single-phase three-wire system in FIG.

  FIG. 4 is a longitudinal explanatory view showing a configuration in which the modular connector 42 according to the embodiment can be attached to and detached from the printed circuit board 44 of each circuit and can be replaced with a module resistor (connector) 42 having a required resistance value. FIG. 5 is a partially longitudinal explanatory view showing a state in which the connector 42 shown in FIG. 4 is mounted on the printed circuit board 44 by pin connection. In the figure, a printed circuit board 44 represents each circuit board in the DC voltage control circuit 37, the reference sine wave signal circuit 26, and the voltage feedback circuit 39, and two round pins 46, 46 are required on the surface of the printed circuit board 44. It is erected at intervals. The base of each round pin 46 is soldered to a circuit pattern 48 printed on the back surface of the printed circuit board 44.

  The connector 42 having a built-in resistor 50 having a required fixed value is detachably mounted on the two round pins 46, 46 erected on the printed circuit board 44. That is, FIG. 5 shows a state where the connector 42 is mounted on the printed board 44, and FIG. 4 shows a state where the connector 42 is detached from the printed board 44. Here, inside the connector 42, two hollow cylindrical sleeves 52, 52 are provided upright at the base of the connector 42 with a predetermined distance therebetween. Therefore, the round pin 46 can be inserted into the hollow portion of the cylindrical sleeve 52 in a close contact state. Further, inside the connector 42, the resistor 50 having a required resistance value is soldered to the two cylindrical sleeves 52, 52. Accordingly, as shown in FIG. 5, two round pins 46, 46 standing on the printed circuit board 44 are inserted correspondingly into the two cylindrical sleeves 52, 52 opened at the bottom of the connector 42. As a result, the connector 42 makes a jumper connection between the two circuit patterns 48, 48 on the printed circuit board 44. As a result, the resistor 50 having a required resistance value in the connector 42 is inserted into the two circuit patterns 48 and 48, and the DC voltage in the circuit, for example, the DC voltage control circuit 37 is set to a desired value. be able to.

  The above-described connector 42 having a module resistance is prepared with a resistance value for commercial or industrial AC voltage in an overseas destination country, and a connector (module resistance) 42 having a resistance value for a specific destination country. Is selected and mounted on each circuit of the control unit 35 at the factory before shipment (see FIG. 4). Further, it may be shipped from the factory with the connector 42 removed from the control unit 35, and a module resistor (connector) 42 appropriately selected when used in the destination country may be mounted. 4 and 5 show the case where the module resistance connector 42 is attached and detached by inserting and removing the cylindrical sleeve 52 and the round pin 46 as one embodiment. It is not limited to. For example, a required number of resistors 50 having different resistance values are mounted on the printed circuit board 44 in a radial manner, and a rotary selector is rotated step by step so that a resistor 50 having a required value is selected by a contact of the selector. Also good.

10 three-phase generator, 10a master armature winding, 10b slave armature winding,
14 converter, 16 first converter, 18 second converter,
20 inverters, 22 inverter drive circuits, 24 sine wave conversion circuits,
26 reference sine wave signal circuit, 31 carrier wave generation circuit, 35 control unit,
37 DC voltage control circuit, 39 Voltage feedback circuit

Claims (4)

A three-phase generator (10) that is driven by a rotation source to generate a three-phase alternating current, and a converter (14) and an inverter that convert the three-phase alternating current generated by the three-phase generator (10) into a single-phase alternating current ( 20) In an inverter generator comprising a control unit (35) for electrically controlling
The setting of various voltages in the control unit (35) is performed by changing the resistance value in each corresponding circuit,
The inverter generator is configured such that the resistance value is changed by attaching and detaching module resistances of various resistance values prepared separately to each required circuit. A three-phase generator (10) driven by a rotation source to generate a three-phase alternating current, and electrically converting the three-phase alternating current generated by the three-phase generator (10) into a single-phase alternating current A control unit (35),
The control unit (35) includes a converter (14) that converts three-phase alternating current generated by the three-phase generator (10) into direct current, and an inverter that converts direct current from the converter (14) into single-phase alternating current ( 20), a DC voltage control circuit (37) for controlling the DC voltage value converted by the converter (14), and an inverter drive circuit (22) for driving a self-extinguishing switching element in the inverter (20) A reference sine wave signal circuit (26) for generating a data signal for generating a reference sine wave, a sine wave conversion circuit (24) for generating a reference sine wave based on the data signal, and higher than the reference sine wave A carrier wave generating circuit (31) for generating a carrier wave of a frequency, and a voltage feedback circuit (39) for monitoring and holding a single-phase AC voltage output from the inverter (20) to be constant,
The self-extinguishing switching element is driven by a pulse obtained by pulse-width-modulating a mixed waveform obtained by superimposing the reference sine wave and the carrier wave from the inverter driving circuit (22), from the inverter (20). In an inverter generator that outputs single-phase alternating current at the desired frequency,
The setting of the DC voltage in the DC voltage control circuit (37), the setting of the reference sine wave voltage in the reference sine wave signal circuit (26) and the setting of the feedback voltage in the voltage feedback circuit (39) are all in each circuit ( 37, 26, 39) is performed by changing the resistance value provided,
The change of the resistance value is configured to be performed by replacing module resistances of various resistance values prepared separately to each required circuit (37, 26, 39). . A three-phase generator (10) that has a master winding (10a) and a slave winding (10b) and is driven by a rotation source to generate a three-phase alternating current, and the three-phase generator (10) generates power In an inverter generator comprising a converter (16, 18) that converts three-phase alternating current into single-phase or three-phase alternating current and a control unit (35) that electrically controls the inverter (20),
The setting of various voltages in the control unit (35) is performed by changing the resistance value in each corresponding circuit,
The inverter generator is configured such that the resistance value is changed by attaching and detaching module resistances of various resistance values prepared separately to each required circuit. A three-phase generator (10) having a master winding (10a) and a slave winding (10b) and driven by a rotation source to generate a three-phase alternating current from each winding (10a, 10b); A control unit (35) for electrically controlling the conversion of the three-phase alternating current generated by the generator (10) into a single-phase or three-phase alternating current;
The control unit (35) converts the three-phase alternating current generated by the master winding (10a) into direct current and the three-phase alternating current generated by the slave winding (10b) into direct current. A second converter (18) for conversion, an inverter (20) for converting each direct current from the first and second converters (16, 18) into a three-phase alternating current, the first converter (16) and the second converter ( DC voltage control circuit (37, 37) for controlling the DC voltage converted in 18), inverter drive circuit (22) for driving the self-extinguishing switching element in the inverter (20), and a reference sine wave A reference sine wave signal circuit (26) for generating a data signal for generation, a sine wave conversion circuit (24) for generating a reference sine wave based on the data signal, and a carrier wave having a frequency higher than that of the reference sine wave Output from the carrier (31) and the inverter (20). AC voltage of the single-phase or three-phase monitoring becomes from a voltage feedback circuit for holding at a constant (39),
The self-extinguishing switching element is driven by a pulse obtained by pulse-width-modulating a mixed waveform obtained by superimposing the reference sine wave and the carrier wave from the inverter driving circuit (22), from the inverter (20). In an inverter generator that outputs single-phase or three-phase alternating current at the desired frequency,
Setting of the DC voltage in the DC voltage control circuit (37, 37), setting of the reference sine wave voltage in the reference sine wave signal circuit (26) and setting of the feedback voltage in the voltage feedback circuit (39) are all It is done by changing the resistance value of the circuit (37, 37, 26, 39),
The inverter power generation is characterized in that the change of the resistance value is performed by attaching / detaching a module resistance of various resistance values prepared separately to a required circuit (37, 37, 26, 39). Machine.

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