JPH0678555A - Inverter device - Google Patents

Abstract

PURPOSE:To make an input distortion small and then to increase a power factor by inserting a diode between a rectifying circuit and a smoothing capacitor and by installing a series circuit of a coil and a capacitor between a contact between the diode and the rectifying circuit and a contact between switching elements. CONSTITUTION:Switching elements 4, 5, which are alternately turned on and off by a controlling circuit 8, are installed across an output terminal of a rectifying circuit 2 which rectifies ac voltage and then outputs dc voltage. Diodes 6, 7 are also installed which are equivalently and antiparallelly connected to the switching elements 4, 5 respectively. Between the rectifying circuit 2 and the switching elements 4, 5, a smoothing capacitor 3 is inserted. In such an inverter device, a diode 14 is inserted between the rectifying circuit 2 and the smoothing capacitor 3. Then, a series circuit of a coil 15 and a capacitor 16 is connected between a contact between the diode 14 and the rectifying circuit 2 and a contact between the switching elements 4 and 5 to increase a power factor of the device and to reduce higher harmonic waves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device for converting a commercial AC power source into a DC voltage, switching the DC voltage by turning on / off a switching element and supplying the DC voltage to a load.

[0002]

2. Description of the Related Art FIG. 15 shows, for example, JP-A-3-283297.
FIG. 3 is a configuration diagram of a conventional inverter device disclosed in Japanese Patent Publication No. JP-A-2003-242, in which a DC voltage obtained by rectifying a commercial power supply 1 by a rectifier circuit 2 is smoothed by a capacitor 1, and switching elements 4 and 5 connected in series are provided. The control circuit 8 controls so that the switching elements 4 and 5 are alternately turned on, and high-frequency power is supplied from the connection point of the switching elements 4 and 5 through the coupling capacitor 9 and the current limiting coil to a load (for example, discharge). Lamp). The diodes 6 and 7 are respectively connected in parallel to the switching elements 4 and 5 for the purpose of flowing a regenerative current. Reference numeral 12 is a discharge lamp, 11 is a capacitor connected in parallel to the discharge lamp, and a resonance circuit is constituted by the coil 10 and the capacitor 11, and a high voltage necessary for discharging is generated from both ends of the capacitor 11.

[0003]

Since the conventional inverter device is configured as described above, the input current waveform becomes a pulse-like sharpness because of the capacitor input type, which causes a reduction in power factor and harmonic interference. Is a problem (Fig. 16).

An object of the present invention is to obtain an inverter device which can reduce input distortion at a low cost, has a high power factor, and has few harmonics.

[0005]

An inverter device according to a first aspect of the present invention is provided between a rectifier circuit for rectifying an AC voltage and outputting a DC voltage, and an output terminal of the rectifier circuit, which are connected in series and are alternately turned on. A switching element that is turned off, a diode that is equivalently connected to each switching element in anti-parallel, a control circuit that controls on / off of the switching element, and a rectifier circuit that is provided between the switching element In an inverter device including a smoothing capacitor, the diode inserted between the rectifying circuit and the smoothing capacitor is another diode, a connection point between the diode and the rectifying circuit, and a connection point between the switching elements. It comprises a series circuit of a coil and a capacitor.

An inverter device according to a second aspect of the present invention is provided with a rectifier circuit that rectifies an AC voltage and outputs a DC voltage, and a pair of switching devices that are provided between output terminals of the rectifier circuit and are connected in series with each other and that are alternately turned on and off. In an inverter device for supplying electric power to a load including a coil, the element, a diode equivalently connected in antiparallel to each switching element, and a control circuit for ON / OFF controlling the switching element, A series connection circuit, which is connected in parallel to at least one of the switching elements and includes the coil, the diode, and the capacitor, charges the capacitor via the coil when the switching element is conducting, and The charge is transferred to a circuit including the switching element during a period when the output voltage instantaneous value of the rectifier circuit is low. It is intended to supply.

An inverter device according to a third aspect of the present invention includes a rectifier circuit that rectifies an AC voltage and outputs a DC voltage, and a pair of switching devices that are provided between output terminals of the rectifier circuit and that are connected in series with each other and that are alternately turned on and off. In an inverter device for supplying electric power to a load including a coil, the element, a diode equivalently connected in antiparallel to each switching element, and a control circuit for ON / OFF controlling the switching element, A series connection circuit of a capacitor and at least one reverse blocking switch connected in parallel to the switching element, a diode inserted between the rectifier circuit and the switching element to charge the capacitor, and a connection between the rectifier circuit and the diode. And a coil inserted at a connection point of the switching element, the coil being The electromotive force generated by turning on and off the switching element is supplied to the capacitor, and is intended to supply in parallel to the switching element to charge said capacitor.

An inverter device according to a fourth aspect of the present invention is a rectifier circuit that rectifies an AC voltage and outputs a DC voltage, an inverter that is provided between output terminals of the rectifier circuit and that supplies power to a load circuit, and the rectifier circuit. And a inverter that is provided between the inverter and the inverter, and that stores a charge to be charged, and a control circuit that controls the output of the inverter during charging of the capacitor to reduce the harmonic component contained in the AC voltage. .

An inverter device according to a fifth aspect of the present invention includes a rectifier circuit that rectifies an AC voltage and outputs a DC voltage, an inverter that is provided between output terminals of the rectifier circuit, and that supplies power to a load circuit, and the rectifier circuit. A capacitor provided between the inverter and the inverter, the capacitor being charged via the switching element of the inverter and supplying the charge to the inverter during a period when the instantaneous value of the AC voltage is low, the state of charge of the capacitor and the inverter. And a control circuit for reducing the harmonic components contained in the AC voltage.

According to another aspect of the inverter device of the present invention, a rectifier circuit that rectifies an AC voltage and outputs a DC voltage, a capacitor that is connected to an output terminal of the rectifier circuit, and has a diode that is connected in parallel in reverse polarity, respectively. The output terminal of the rectifier circuit is connected via a diode other than the diode,
A series-connected switching element that turns on and off alternately, a diode that is equivalently connected in anti-parallel with each switching element, and a capacitor that is connected in parallel with the series-connected switching element are separate. Connected between the middle point of the capacitor at the output end of the rectifier circuit and the connection point of the switching element, the load to which AC power is supplied by the on / off operation of the switching element, and the load. And a coil connected in parallel with any one of the switching elements.

An inverter device according to a seventh aspect of the present invention is a rectifier circuit which rectifies an AC voltage and outputs a DC voltage, and a pair of switching circuits which are provided between output terminals of the rectifier circuit and which are connected in series with each other and which are alternately turned on and off. In an inverter device for supplying electric power to a load, the switching element includes an element, a diode in which the respective switching elements are equivalently connected in anti-parallel, and a control circuit for ON / OFF controlling the switching element. It is connected in parallel and comprises a series connection circuit of a capacitor and at least one reverse blocking switch, and a coil inserted between the rectifier circuit and the midpoint of the switching element, and this coil turns on the switching element.・ Supplying electromotive force generated by turning off the capacitor, and charging the capacitor in parallel with the switch And supplies the grayed element.

An inverter device according to an eighth aspect of the present invention includes a rectifier circuit which rectifies an AC voltage and outputs a DC voltage, and a switching element which is provided between output terminals of the rectifier circuit and which is connected in series with each other and is alternately turned on / off. , A diode connected in anti-parallel equivalent to each of these switching elements,
A control circuit for ON / OFF controlling the switching element, a smoothing capacitor provided between the rectifier circuit and the switching element, and a load are connected in series, one end of which is a connection point of the switching element and the other end of which is a capacitor. And a coil connected to the output end of the rectifying circuit via the coil.

[0013]

The inverter device according to the first aspect can provide a device having a high power factor and less generation of harmonics.

The inverter device according to the second aspect is economical because it can be shared with a coil required when the capacitor is charged as a choke input type.

In the inverter device of the third aspect, not only the harmonics can be reduced by choppering the input current from the AC power source side through the coil, but also the generated voltage can be divided by the capacitor and supplied, so that the withstand voltage of the switching element is increased. Is low.

According to the fourth aspect of the present invention, the inverter device controls the charge state of the capacitor for supplying the charge to the inverter and the output of the inverter in association with each other to reduce the harmonic components contained in the AC voltage.

In the inverter device according to the fifth aspect, not only the harmonics can be reduced by choppering the input current from the AC power source side through the coil, but also the generated voltage can be divided by a plurality of capacitors and supplied. The withstand voltage of is low.

According to the sixth aspect of the inverter device, the output of the inverter is controlled by detecting the AC voltage value.

In the inverter device according to the seventh aspect, the higher harmonics of the input current can be reduced by changing the frequency, and the charging current to the capacitor can be reduced by increasing the frequency. It has the effect of suppressing current distortion.

According to the eighth aspect of the inverter device, it is possible to provide a device having a high power factor and less generation of harmonics with a small number of parts.

[0021]

EXAMPLES Example 1. 1 is a block diagram showing a first embodiment of the present invention, in which 1 to 12 are exactly the same as the above-mentioned conventional device. In addition to the conventional inverter device, the diode 14 is inserted between the rectifier circuit 2 and the smoothing capacitor 3,
Further, at the connection point between the rectifier circuit 2 and the diode 14 and the connection point between the switching elements 4 and 5, the coil 15 and the capacitor 1 are connected.
6 series circuits are connected. Also, the filter 13 is inserted into the input.

Next, the operation will be described with reference to the operation waveform chart of FIG. 2 and the operation waveform chart of FIG. 2A shows an input voltage waveform from the commercial power supply 1, and FIG. 2B shows a DC voltage waveform rectified by the rectifier circuit 2. This rectified voltage charges the capacitor 3 via the diode 14 as in the conventional case. Therefore, the potential of the capacitor 3 becomes the DC voltage E _V. (C) is an ON / OFF waveform of the switching element 5, and (d) is an ON / OFF waveform of the switching element 4. Similarly, FIG. 3G is an enlarged view of the ON / OFF waveform of the switching element 5, (h)
FIG. 4 is an enlarged view of an ON / OFF waveform of the switching element 4. (I) shows the voltage waveform of the capacitor 16, and the voltage of the capacitor 16 is charged through the coil 15 by the output voltage of the rectifier circuit 2 when the switching element 5 is ON. Next, when the switching element 5 is turned off and the switching element 4 is turned on, it is biased by the DC voltage of the capacitor 3 and the potential at the connection end of the coil 15 rises E _V. Then, the electric charge accumulated when the switching element 5 is turned on charges the capacitor 3 via the coil 15 or is discharged to the load via the switching element. (J) is a current waveform of the coil 15, a positive gradient current is a charging current from the rectifying circuit to the capacitor 16, a negative gradient is a discharging current of the capacitor 16, and the coil 15 suppresses the charging / discharging current. FIG. 4E shows a rectified current waveform, in which a current flows through the capacitor 16 only when the switching element 5 is turned on, and the peak current thereof corresponds to the input voltage. Therefore, the envelope of the peak current has the same phase as the waveform of the commercial power supply and has the same shape. Then, since the input current waveform shown in (f) is obtained by the filter 13, the input distortion can be reduced at a low cost, so that an inverter device having a high power factor and less harmonics can be provided.

Example 2. FIG. 4 is a block diagram showing a second embodiment of the present invention, and 1 to 13 are exactly the same as those of the first embodiment. Reference numerals 30, 31, 33 are diodes, and 32 is a capacitor. 4 switching elements connected in series
・ 5 alternately turns on and off to supply high frequency power to the load circuit. Here, when the switching element 4 is turned on, the capacitor 32 is charged through the coil 10. The charged electric charge is discharged through the diode 30 and supplied to the inverter during the period when the instantaneous value of the AC power source is low.
FIG. 5 shows the state of this operation. (A) shows the output voltage waveform of the rectifier circuit that rectifies the AC power supply 1, and the electric charge charged in the capacitor 32 makes it instantaneous as shown in (b). During the period when the value is low
The voltage of 2 is supplied to the inverter. Therefore, power can be supplied to the load even during a period in which the voltage of the AC power supply is low. Therefore, the coil required when the capacitor is charged as a choke input type can be shared with the coil of the load circuit, which is economical.

Example 3. FIG. 6 shows a device in which the load circuit is connected in parallel with the lower switching element 5 except that the capacitor 32 is charged when the switching element 5 is on. It operates in the same manner as and has the same effect.

Example 4. The configuration of the load circuit is not limited to the above embodiment, and the load may be other than the discharge lamp.

Example 5. If the switching element is not a bipolar transistor but a switching element called POWER MOS FET in which diodes are equivalently connected in parallel is used, the number of diodes can be reduced in appearance.

If a discharge lamp is used as the load and two lamps are used, for example, when another pair of 9 to 12 parts in FIG. It is also possible to make the same connection as the diode 31 of No. 2 and share one capacitor 32 and diode 30.

Example 6. FIG. 7 is a configuration diagram showing a sixth embodiment of the present invention, and 1 to 13 are exactly the same as those of the first embodiment. 20 is a coil, 22, 23, 24 and 26 are diodes, and 21 and 25 are capacitors. The switching elements 4 and 5 connected in series are alternately turned on and off to supply high frequency power to the load circuit. Here, when the switching element 5 is turned on, a current flows from the AC power supply through the coil 20. Next, when 5 is turned off, the coil 20
The energy stored in the capacitor is charged in the capacitors 21 and 25 through the diode 6. The charged electric charge is discharged through the diode 30 and supplied to the inverter during the period when the instantaneous value of the AC power supply is low. This capacitor 21
The charge of 25 is discharged during the period when the instantaneous value of the AC power supply is low as shown in FIG. 5 in the same manner as described with reference to FIG. Capacitor 21
It suffices that the capacitors 25 are selected to have substantially equal capacities. Each capacitor voltage is V2 in the schematic diagram (b). Not only the harmonics can be reduced by choppering the input current from the AC power source side through the coil 20, but also the generated voltage can be divided by the capacitor and supplied, so that the withstand voltage of the switching element is low.

Example 7. In the sixth embodiment, impedances for suppressing the peak current during charging from the diode 26 may be connected in series to the plurality of capacitors.

Example 8. In the above-described sixth embodiment, the voltage dividing by the capacitors 21 and 25 is about 1/2, but the voltage dividing may be performed by connecting three or more capacitors in series.

Example 9. FIG. 8 is a configuration diagram according to a ninth embodiment of the present invention, and 1 to 13 are exactly the same as those in the first embodiment. A DC voltage applied from the AC power supply through the rectifier circuit 2 is applied to the inverter. The switching elements 4 and 5 of the inverter are alternately turned on / off to supply harmonic power to the discharge lamp of the load. Here, when the transistor 4 is turned on, the capacitor 32 is charged through the coil 40.
This coil acts as a choke input to the capacitor 32. This charged electric charge is discharged through the diode 30 and supplied to the inverter during the period when the instantaneous value of the output voltage of the rectifier circuit is low. The control circuit 8 of the inverter detects the charging current of the coil 40 and changes the switching frequency of 4 and 5 according to the charging current. FIG. 9 shows this state, (a) is the output voltage obtained by rectifying the AC power supply,
(B) is the input voltage of the inverter in which the charged charges of the capacitor 32 are combined, (c) is the input current waveform when the output frequency of the inverter is not controlled, and power is supplied from the capacitor 32 during the period T. Therefore, there is almost no input current. (D) is the input current of the inverter when the control of this embodiment is performed (current supplied to the load side: Here, the input current of the inverter is the coil 40 to the capacitor 32.
Is not included). Since the inverter can reduce the current of the discharge lamp by increasing the frequency, the input current can be reduced by changing the frequency as in the section A. Then, the input current seen from the AC power supply side is shown in Fig. 9.
(C) As indicated by the broken line, higher harmonics can be reduced. At the same time, by increasing the frequency, the capacitor 3
Since the charging current to 2 can be reduced, the effect of suppressing the distortion of the input current from the AC power supply is also obtained from this point.
The control state of the inverter frequency with respect to the phase of the alternating current power supply of (e) is shown.

Example 10. In the ninth embodiment, the inverter may be PWM control instead of frequency control. In the configuration in which the transistor 4 is charged as in the ninth embodiment, only the upper switching element 4 may be PWM and the other may be a fixed ON period. Conversely, if the capacitor 32 is configured to be charged by the switch of 5, the switch of 5 is provided. You may perform PWM control only.

Example 11. FIG. 10 is a first embodiment of the present invention.
FIG. 1 is a configuration diagram showing No. 1, and 1 to 13 are exactly the same as those in the first embodiment. 41-44 are diodes, 45, 4
6 is a capacitor. Since a plurality of capacitors are charged and discharged in parallel instead of being charged from the inverter, the inverter input voltage waveform becomes the same as in FIG. 9B. In this case as well, the output of the inverter is reduced, that is, the input current of the inverter is reduced while the capacitors 45 and 46 are being charged. In this embodiment, the voltage value of the AC power supply is detected and the output of the inverter is controlled so as to be as indicated by the broken line 9 (c). Any inverter can be applied as long as its output can be variably controlled by the operation control of the switching element 8 (for example, PWM control, frequency, variable control, ON period ratio control of switching element, OFF period ratio control, etc.).

Example 12 Three capacitors may be connected in series instead of two as in the eleventh embodiment, and an appropriate impedance element may be connected in series instead of the resistor 47.

Example 13. As the signal for controlling the output of the inverter, the voltage of the coil 40, the output voltage waveform of the rectifier circuit, and the like are shown as examples, but the signal is not limited thereto. In short, it suffices if it can reduce harmonics (especially higher harmonics).

Example 14 In the case of FIG. 10, since the capacitor is not charged from the switching element of the inverter, the inverter may be any other than the half-bridge inverter of the eleventh embodiment as long as it can output control the load power.

Example 15 The application circuit may have a capacitor to be charged. For example, it can be applied to FIGS. In these cases, if the control circuit has a means capable of variably controlling the output of the inverter and forming an input current target waveform or the like for suppressing higher harmonics, or a means for detecting each instantaneous input current. good.

Example 16. A concrete embodiment of the control circuit 8 of FIG. 8 will be described as a sixteenth embodiment with reference to FIG. Detecting means 81 composed of a secondary winding for detecting the current flowing through the coil 40.
Is detected and rectified to detect the charging state of the capacitor 32. This signal is converted to an appropriate level by the amplifier 85, and this signal is input to the oscillation circuit 86 that changes the output oscillation frequency by the input signal voltage, thereby obtaining the frequency corresponding to the charge state. This is divided by the flip-flop 87, and the drivers 88 and 89 drive the respective switching elements.
In this way, it is possible to control the charging current and the load power of the inverter by changing the output frequency of the inverter according to the charging state of the capacitor. This makes it possible to control the harmonic components of the input current of the AC power supply to be reduced, for example, in the fifth order, the seventh order, and the ninth order.

Example 17 In the sixteenth embodiment, the detecting means detects the charging current of the capacitor 32 in order to reduce the harmonic components. However, the output voltage waveform of the AC power source is used as a target waveform for control, or the input current from the AC power source is detected. It may be realized using other methods such as. In short, the control of the output of the inverter (power supplied to the load) and the control of the charging of the capacitor are intended to reduce harmonics. Therefore, the inverter control method and the load circuit configuration may be different.

Example 18. FIG. 12 is a first embodiment of the present invention.
It is a block diagram which shows 8 and 1-13 is the same thing as the said Example 1 completely. The switching elements 4 and 5 connected in series are alternately turned on and off to supply high frequency power to the load circuit. Here, when the switching element 4 is on, the charge of the capacitor 9 is discharged through the coil 10
2 and the charging current of the capacitor 52 flows from the rectifier circuit 2 (at this time, the charge of the capacitor 51 also flows through the coil 10). When the switching element 4 is turned off, the current flowing through the coil 10 flows through the route of the diode 53 → 55 → capacitor 3 → diode 7 and the capacitor 3
To charge. Next, when the switching element 5 is turned on, the currents from the capacitors 51 and 52 also flow through the coil 10 together with the current flowing through the discharge lamp 12. After that, when 5 is turned off, the current flowing in the coil flows through the diode 6, the capacitor 3, the diode 56, and 54 to charge the capacitor 3. This charged electric charge is supplied to the load circuit of the inverter via the capacitor 9.

Example 19 In the eighteenth embodiment, the discharge lamp 12 is connected in parallel with the switching element 4 via the capacitor 9, but the discharge lamp 12 operates in the same manner even if it is connected in parallel with the switching element 4.

Example 20. FIG. 13 is a block diagram showing a twentieth embodiment of the present invention, in which 1 to 13 are exactly the same as those of the first embodiment. 21 and 25 are capacitors, 22 to 24
Is a diode. The switching elements 4 and 5 connected in series are alternately turned on and off to supply high frequency power to the load circuit. Here, when the switching element 5 is turned on, a current flows from the AC power supply through the coil 20.
Next, when 5 is turned off, the energy stored in the coil 20 is charged in the capacitors 21 and 25 through the diode 6. It is assumed that the charged voltage (total of 21 and 25) has a voltage value of V3 shown in (c) of FIG. 5, for example. Since the charges of this capacitor are supplied to the inverter in parallel by the diodes 22 to 24, the input voltage of the inverter, that is, the switching elements 4 and 5 are supplied with a voltage of about ½ of V3 as shown by the solid line in FIG. 5C. To be done. The capacitors 21 and 25 may be selected so that they have substantially the same capacitance. Each capacitor voltage is 1/2 of V3 in the schematic diagram (c). Therefore, not only the harmonics can be reduced by choppering the input current from the AC power source side through the coil 20, but also the generated voltage can be divided by a plurality of capacitors and supplied, so that the withstand voltage of the switching element is low.

Example 21. In the twenty-third embodiment, the voltage division of about 1/2 by the capacitors 21 and 25 is shown, but three or more capacitors may be connected in series to divide the voltage.

Example 22. In the above embodiment, the load is only one discharge lamp, but when the load is one discharge lamp, the load circuit can be applied not only by one lamp but also by two or more lamps in parallel or by connecting discharge lamps in series.

Example 23. Switching element has power M
The use of OS FETs eliminates the apparent need for parallel diodes.

Example 24. The configuration of the filter 13 can be selected according to need, and the configuration is not limited to the configuration of the above embodiment.

Example 25. Similarly, the configuration of the load circuit is not limited to the configuration of the above embodiment.

Example 26. FIG. 14 shows a second embodiment of the present invention.
6 is a configuration diagram showing No. 6, and the same operation as that of the first embodiment can be performed with a small number of parts.

[0049]

According to the first aspect of the present invention, an inverter device is provided between a rectifier circuit that rectifies an AC voltage and outputs a DC voltage, and a switching circuit that is provided between output terminals of the rectifier circuit and is connected in series with each other to alternately turn on and off. An element, a diode equivalently connected in anti-parallel to each of the switching elements, a control circuit for ON / OFF controlling the switching element, and a smoothing capacitor provided between the rectifier circuit and the switching element. In the provided inverter device,
The diode inserted between the rectifier circuit and the smoothing capacitor comprises another diode, a connection point between the diode and the rectifier circuit, and a series circuit of a coil and a capacitor inserted at the connection point of the switching element. Since it is configured, it is possible to provide a device having a high power factor and less generation of harmonics.

An inverter device according to a second aspect of the present invention is provided with a rectifier circuit that rectifies an AC voltage and outputs a DC voltage, and a pair of switching devices that are provided between the output terminals of the rectifier circuit and are connected in series with each other to alternately turn on and off. In an inverter device for supplying electric power to a load including a coil, the element, a diode equivalently connected in antiparallel to each switching element, and a control circuit for ON / OFF controlling the switching element, A series connection circuit, which is connected in parallel to at least one of the switching elements and includes the coil, the diode, and the capacitor, charges the capacitor via the coil when the switching element is conducting, and The charge is transferred to a circuit including the switching element during a period when the output voltage instantaneous value of the rectifier circuit is low. Since a configuration of the sheet, it is economical because the charging of the capacitor can be shared with the coil necessary to configure the choke input type.

An inverter device according to a third aspect of the present invention includes a rectifier circuit that rectifies an AC voltage and outputs a DC voltage, and a pair of switching devices that are provided between the output terminals of the rectifier circuit and are connected in series with each other to alternately turn on and off. In an inverter device for supplying electric power to a load including a coil, the element, a diode equivalently connected in antiparallel to each switching element, and a control circuit for ON / OFF controlling the switching element, A series connection circuit of a capacitor and at least one reverse blocking switch connected in parallel to the switching element, a diode inserted between the rectifier circuit and the switching element to charge the capacitor, and a connection between the rectifier circuit and the diode. And a coil inserted at a connection point of the switching element, the coil being Since the electromotive force generated by turning on / off the switching element is supplied to the capacitor and the charge of the capacitor is supplied in parallel to the switching element, a chopper for the input current from the AC power supply side is provided through the coil. By doing so, not only the harmonics can be reduced, but also the generated voltage can be divided by the capacitor and supplied, so that the withstanding voltage of the switching element is low.

An inverter device according to a fourth aspect of the present invention is a rectifier circuit that rectifies an AC voltage and outputs a DC voltage, an inverter that is provided between output terminals of the rectifier circuit, and that supplies power to a load circuit, and the rectifier circuit. And a inverter, which is provided between the inverter and the inverter, and stores a charge, and a control circuit for controlling the output of the inverter and reducing the harmonic components contained in the AC voltage when the capacitor is charged. Therefore, the state of charge of the capacitor for supplying the charge to the inverter and the output of the inverter are controlled in association with each other to reduce the harmonic components contained in the AC voltage.

An inverter device according to a fifth aspect of the present invention includes a rectifier circuit that rectifies an AC voltage and outputs a DC voltage, an inverter that is provided between output terminals of the rectifier circuit, and that supplies power to a load circuit, and the rectifier circuit. A capacitor provided between the inverter and the inverter, the capacitor being charged via the switching element of the inverter and supplying the charge to the inverter during a period when the instantaneous value of the AC voltage is low, the state of charge of the capacitor and the inverter. The output voltage of the AC voltage is controlled in a related manner, and the control circuit that reduces the harmonic components contained in the AC voltage is provided. Not only can the voltage be reduced, but the generated voltage can be divided by multiple capacitors and supplied, so the withstand voltage of the switching element is low. Need.

According to another aspect of the inverter device of the present invention, a rectifier circuit that rectifies an AC voltage and outputs a DC voltage, a capacitor that is connected to an output terminal of the rectifier circuit, and has a diode that is respectively connected in parallel in reverse polarity, The output terminal of the rectifier circuit is connected via a diode other than the diode,
A series-connected switching element that turns on and off alternately, a diode that is equivalently connected in anti-parallel with each switching element, and a capacitor that is connected in parallel with the series-connected switching element are separate. Connected between the middle point of the capacitor at the output end of the rectifier circuit and the connection point of the switching element, the load to which AC power is supplied by the on / off operation of the switching element, and the load. Since the coil is connected in parallel with any of the switching elements, the output of the inverter can be controlled by detecting the AC voltage value.

According to another aspect of the inverter device of the present invention, a rectifier circuit that rectifies an AC voltage and outputs a DC voltage, and a pair of switching devices that are provided between the output terminals of the rectifier circuit and are connected in series with each other to alternately turn on and off. In an inverter device for supplying electric power to a load, the switching element includes an element, a diode in which the respective switching elements are equivalently connected in anti-parallel, and a control circuit for ON / OFF controlling the switching element. It is connected in parallel and comprises a series connection circuit of a capacitor and at least one reverse blocking switch, and a coil inserted between the rectifier circuit and the midpoint of the switching element, and this coil turns on the switching element.・ Supplying electromotive force generated by turning off the capacitor, and charging the capacitor in parallel with the switch Since the structure for supplying the grayed element,
High-order harmonics of the input current can be reduced by changing the frequency, and the charging current to the capacitor can be reduced by increasing the frequency. From this point as well, there is an effect of suppressing distortion of the input current.

According to another aspect of the present invention, an inverter device includes a rectifier circuit which rectifies an AC voltage and outputs a DC voltage, and a switching element which is provided between output terminals of the rectifier circuit and which is connected in series with each other and is alternately turned on / off. , A diode connected in anti-parallel equivalent to each of these switching elements,
A control circuit for ON / OFF controlling the switching element, a smoothing capacitor provided between the rectifier circuit and the switching element, and a load are connected in series, one end of which is a connection point of the switching element and the other end of which is a capacitor. Since the coil is connected to the output end of the rectifier circuit via the coil, it is possible to provide a device having a high power factor and less generation of harmonics with a small number of parts.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an inverter device according to a first embodiment of the present invention.

FIG. 2 is an operation waveform diagram of the inverter device according to the first embodiment of the present invention.

FIG. 3 is an operation waveform diagram of the inverter device according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram of an inverter device according to a second embodiment of the present invention.

FIG. 5 is an operation waveform diagram of the inverter device according to the second embodiment of the present invention.

FIG. 6 is a configuration diagram of an inverter device according to a third embodiment of the present invention.

FIG. 7 is a configuration diagram of an inverter device according to a sixth embodiment of the present invention.

FIG. 8 is a configuration diagram of an inverter device according to a ninth embodiment of the present invention.

FIG. 9 is an operation waveform diagram of an inverter device according to a ninth embodiment of the present invention.

FIG. 10 is a configuration diagram of an inverter device according to an eleventh embodiment of the present invention.

FIG. 11 is a configuration diagram of an inverter device according to a sixteenth embodiment of the present invention.

FIG. 12 is a configuration diagram of an inverter device according to an eighteenth embodiment of the present invention.

FIG. 13 is a configuration diagram of an inverter device according to a twentieth embodiment of the present invention.

FIG. 14 is a configuration diagram of an inverter device according to a twenty-sixth embodiment of the present invention.

FIG. 15 is a configuration diagram of a conventional inverter device.

FIG. 16 is an operation waveform diagram of a conventional inverter device.

[Explanation of symbols]

 1 Commercial Power Source 2 Rectifier Circuit 3 Capacitor 4 Switching Element 5 Switching Element 6 Diode 7 Diode 8 Control Circuit 9 Coupling Capacitor 10 Coil 11 Capacitor 12 Discharge Lamp 13 Filter 14 Diode 15 Coil 16 Capacitor 20 Coil 21 Capacitor 22 Diode 23 Diode 24 Diode 25 diode 26 diode 30 diode 31 diode 32 capacitor 33 diode 40 coil 41 diode 42 diode 43 diode 44 diode 45 capacitor 46 capacitor 51 capacitor 52 capacitor 53 diode 54 diode 55 diode 56 diode 61 charge detection 81 detection means 85 amplifier 86 oscillator circuit 87 Flip-flop 8 Driver 89 driver

Claims (8)

[Claims] 1. A rectifying circuit for rectifying an AC voltage to output a DC voltage, switching elements provided between output terminals of the rectifying circuit, connected in series with each other to alternately turn on and off, and respective switching elements. In an inverter device comprising a diode equivalently connected in anti-parallel to the control circuit, a control circuit for controlling ON / OFF of the switching element, and a smoothing capacitor provided between the rectifying circuit and the switching element. An inverter device including the diode inserted between the circuit and the smoothing capacitor, another diode, a connection point between the diode and the rectifier circuit, and a series circuit of a coil and a capacitor inserted at the connection point of the switching element. . 2. A rectifier circuit that rectifies an AC voltage to output a DC voltage, a pair of switching elements that are provided between output terminals of the rectifier circuit, are connected in series with each other, and are turned on and off alternately. In an inverter device that includes a diode equivalently connected in anti-parallel to a switching element and a control circuit that controls ON / OFF of the switching element, and supplies power to a load including a coil, at least one of the switching elements. One side of the rectifier circuit is connected in parallel to the one side of the rectifier circuit, and includes a series connection circuit including the coil, the diode and the capacitor, which charges the capacitor through the coil when the switching element is turned on. The circuit is characterized in that it is supplied to a circuit including the switching element during a period when the output voltage instantaneous value is low. Verta device. 3. A rectifier circuit that rectifies an AC voltage to output a DC voltage, a pair of switching elements that are provided between the output terminals of the rectifier circuit and that are connected in series with each other and that are alternately turned on and off, respectively. In an inverter device that includes a diode equivalently connected in anti-parallel to a switching element and a control circuit that controls on / off of the switching element, and that is connected in parallel to the switching element in an inverter device that supplies power to a load including a coil A series connection circuit of a capacitor and at least one reverse blocking switch, a diode inserted between the rectifier circuit and a switching element to charge the capacitor, a connection point between the rectifier circuit and the diode, and the switching element. And a coil inserted at a connection point of the switching element for turning on / off the switching element. An inverter device characterized in that an electromotive force generated by the capacitor is supplied to the capacitor, and charges of the capacitor are supplied in parallel to the switching element. 4. A rectifier circuit that rectifies an AC voltage and outputs a DC voltage, an inverter that is provided between output terminals of the rectifier circuit and that supplies power to a load circuit, and between the rectifier circuit and the inverter. An inverter device provided with a capacitor for accumulating charged electric charge and a control circuit for controlling an output of the inverter to reduce a harmonic component contained in the AC voltage when the capacitor is charged. 5. A rectifier circuit that rectifies an AC voltage to output a DC voltage, an inverter that is provided between output terminals of the rectifier circuit and that supplies power to a load circuit, and between the rectifier circuit and the inverter. A capacitor that is provided and is charged via the switching element of the inverter and supplies a charging charge to the inverter during a period when the instantaneous value of the AC voltage is low, and relates a charge state of the capacitor and an output of the inverter to each other. And a control circuit for reducing the harmonic components contained in the AC voltage. 6. A rectifying circuit for rectifying an AC voltage to output a DC voltage, a capacitor having diodes connected in parallel to each other and having opposite polarities, and an output end of the rectifying circuit. A switching element connected in series via a diode different from the diode, which is alternately turned on and off, and a diode connected in anti-parallel equivalent to each switching element, and the series connection. A capacitor other than the capacitor connected in parallel with the switching element, a load to which AC power is supplied by the on / off operation of the switching element, a middle point of the capacitor at the output end of the rectifier circuit, and the switching An inductor having a coil connected to the connection point of the element and having the load connected in parallel with any one of the switching elements. Verta device. 7. A rectifier circuit that rectifies an AC voltage to output a DC voltage, a pair of switching elements that are provided between output terminals of the rectifier circuit, are connected in series with each other, and are turned on and off alternately. In an inverter device that includes a diode in which switching elements are equivalently connected in anti-parallel, and a control circuit that controls on / off of the switching element, and is connected in parallel to the switching element and a capacitor in an inverter device that supplies power to a load. And a coil connected between the rectifier circuit and the midpoint of the switching element, the coil being connected between the rectifier circuit and the switching element in series. Power is supplied to the capacitor, and charges of the capacitor are supplied in parallel to the switching element. And inverter device. 8. A rectifier circuit for rectifying an AC voltage to output a DC voltage, switching elements provided between output terminals of the rectifier circuit, connected in series with each other to alternately turn on and off, and respective switching elements. Equivalently connected in anti-parallel with a diode, a control circuit for controlling the switching element on / off, a smoothing capacitor provided between the rectifier circuit and the switching element, and a load connected in series, with one end An inverter device comprising: a connecting point of the switching element; and a coil, the other end of which is connected to an output end of the rectifier circuit via a capacitor.