JP2007244170A - Power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply system that improves power factor by widening a continuity angle of an input current by a simple control, as well as, develops a large output. <P>SOLUTION: A power supply system includes a reactor 2 connected to rectifier circuits 3a to 3d; a first and a second switching devices 8, 9 for connecting, breaking current routes; a capacitor 5 for improving power factor connected between AC input and DC output terminals of a rectifier circuit; a capacitor 6 for improving phase connected between AC input terminals of the rectifier circuit; a smoothing capacitor 4 for smoothing an output voltage of the rectifier circuit; an AC voltage detecting means 32 for detecting the voltage values of an AC power source 1; an AC voltage amplitude detecting means 33 for detecting either one among the effective value, mean value, peak value, and a switch control means 30 for controlling the first and the second switching means. The switch control means 30 receives voltage values detected by the AC voltage detecting means 32 and the magnitudes of voltages by the AC voltage amplitude detecting means 33, and outputs a pulse signal that turns on at least either of the first switching device 8 or the second switching device 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power supply device for converting AC to DC and reducing a harmonic component of an input current to improve a power factor.

  Capacitor input type rectifier circuits have been used in various fields as an AC-DC converter circuit in which AC voltage is input to a diode rectifier circuit to obtain a pulsating output, and this is smoothed by a capacitor to obtain a DC voltage. ing. The input current of this circuit has a narrow current conduction angle, a poor power factor, and a large amount of reactive power, so that the power cannot be effectively used, and it contains many harmonic components and is an obstacle to equipment connected to the same power supply system. Is a problem.

  Therefore, a power supply device shown in Patent Document 1 has been studied as a technique for improving the power factor and reducing harmonic components. FIG. 9 is a circuit configuration diagram of the power supply device. The power supply device of FIG. 9 includes an AC input terminal and a DC output terminal of the rectifier circuits 73a to 73d, in addition to a capacitor input circuit composed of an AC power supply 71, a reactor 72, diodes 73a to 73d and a smoothing capacitor 74. A power factor improving capacitor 75 is inserted between them. Reference numeral 80 denotes a load such as a motor drive inverter.

  FIG. 10 shows an example of voltage / current waveforms of the power supply device of FIG. Hereinafter, the operation will be described in detail by dividing one cycle of the AC power supply 71 into four periods with reference to FIG.

  Period 1: There is no charging voltage in the power factor improving capacitor 75, the AC power source 71 starts to output a positive voltage from zero, and the AC power source 71, the reactor 72, and the power factor improving capacitor 75 as shown in FIG. The current Iin for charging the voltage Vc of the power factor improving capacitor 75 flows in the order of the diode 73d and the AC power supply 71.

  This operation continues until the power factor improving capacitor 75 is charged and the voltage Vc across the power factor improving capacitor becomes equal to the voltage Vdc across the smoothing capacitor.

  Period 2: Since the voltage value Vac of the AC power supply 71 is larger than the voltage Vdc across the smoothing capacitor, as shown in FIG. 11B, the AC power supply 71, the reactor 72, the diode 73a, the smoothing capacitor 74, the diode 73d, and the AC power supply A current Iin for charging the voltage Vdc of the smoothing capacitor 74 flows in the order of 71.

  In addition to this, the current continues to flow through the path of FIG. 11B until the energy stored in the reactor 72 is released in the periods 1 and 2.

  Period 3: The power factor improving capacitor 75 is charged with the same voltage Vc as the voltage Vdc across the smoothing capacitor, and the AC power supply 71 starts to output a negative voltage from zero, and as shown in FIG. A current Iin for discharging the voltage Vc of the power factor improving capacitor 75 flows in the order of the power source 71, the diode 73c, the smoothing capacitor 74, the power factor improving capacitor 75, the reactor 72, and the AC power source 71.

  This operation continues until the voltage Vc charged in the power factor correction capacitor 75 is discharged to zero.

Period 4: Since the voltage value Vac of the AC power supply 71 is larger than the voltage Vdc across the smoothing capacitor, as shown in FIG. 11D, the AC power supply 71, the diode 73c, the smoothing capacitor 74, the diode 73b, the reactor 72, the AC power supply A current Iin for charging the voltage Vdc of the smoothing capacitor 74 flows in the order of 71.

  In addition to this, current continues to flow through the path of FIG. 11D until the energy stored in the reactor 72 is released in the periods 3 and 4.

  As described above, the current conduction angle is widened by repeating the operations of the periods 1 to 4 for each period of the AC power supply 71, so that the power factor can be improved and the harmonic component contained in the input current Iin can be reduced. it can.

In particular, the energy stored in the reactor 72 in periods 1 and 3 is released in periods 2 and 4, respectively, so that the output voltage of the power supply device, that is, the voltage Vdc of the smoothing capacitor 74 can be increased.
Japanese Patent No. 3377959

  However, although the conventional power supply apparatus shown in FIG. 10 can improve the power factor with a simple configuration, it is necessary to set a large value for the reactor 72 in order to comply with the IEC harmonic regulation. As the load increases, the phase of the current Iin with respect to the voltage value Vac of the AC power supply 71 is delayed, and the power factor decreases, so that there is a problem that the power that can be supplied to the load 80 decreases.

  Further, since the voltage drop due to the reactor 72 is large and the output voltage, that is, the voltage across the smoothing capacitor 74 is lowered, there is a problem that a necessary voltage cannot be obtained as the load 80 increases.

The present invention solves such a conventional problem,
It aims at providing the power supply device which can implement | achieve a high power factor and high output while responding to IEC high frequency regulation.

  In order to solve the above problems, the present invention provides a rectifier that rectifies an AC power supply voltage and outputs a pulsating voltage, a reactor connected to the rectifier, and a first and a second that connect and cut off a current path. Open / close means, a first open / close means connected in series, a power factor improving capacitor connected between an AC input terminal and a DC output terminal of the rectifier circuit, and a second open / close means connected in series, and rectified. A phase improving capacitor connected between the AC input terminals of the circuit, a smoothing capacitor for smoothing the output voltage of the rectifier circuit to obtain a substantially DC voltage, an AC voltage detecting means for detecting the voltage value of the AC power source, and an AC power source AC voltage amplitude value detecting means for detecting either an effective value, an average value, or a peak value of the power supply, and switch control means for controlling the first and second opening / closing means. The switch control means includes an AC voltage detecting means. Inspection Voltage value and AC voltage amplitude value detecting means in which outputs a pulse signal for turning on at least one of the first and second switching means receiving the magnitude of the AC voltage detected.

  With the above-described configuration, the power factor and the output voltage can be significantly improved, and a power supply device that can meet the IEC harmonic regulations with a simple and inexpensive configuration and can realize a high output can be provided.

  The power supply device of the present invention can achieve high power factor and high output while clearing IEC harmonic regulations.

  According to a first aspect of the present invention, there is provided a rectifier circuit that rectifies an AC power supply voltage and outputs a pulsating voltage, a reactor connected to the rectifier circuit, first and second opening / closing means for connecting and blocking a current path, A power factor improving capacitor connected in series with the first switching means and connected between the AC input terminal and the DC output terminal of the rectifier circuit, and an AC input terminal of the rectifier circuit connected in series with the second switch means A phase improving capacitor connected in between, a smoothing capacitor that smoothes the output voltage of the rectifier circuit to obtain a substantially DC voltage, an AC voltage detecting means for detecting the voltage value of the AC power supply, and an effective value or average of the AC power supply AC voltage amplitude value detecting means for detecting either the value or the peak value, and switch control means for controlling the first and second opening / closing means, the switch control means including a voltage value detected by the AC voltage detecting means and Exchange In which the voltage amplitude value detection means for outputting a pulse signal for turning on at least one of the first and second switching means receiving the magnitude of the AC voltage detected.

  As a result, it is possible to reliably perform pulse output at the optimum timing at all times in accordance with fluctuations in the power supply voltage, so that it is possible to provide a power device with high power factor, high output and high reliability. As a result, it is possible to comply with IEC harmonic regulations.

  In the second invention, the AC voltage amplitude value detecting means detects the magnitude of the AC power source from the voltage across the smoothing capacitor in the no-load state after the power is turned on.

  As a result, it is possible to reliably perform pulse output at the optimum timing in accordance with fluctuations in the power supply voltage with a simple configuration, so that it is possible to easily provide a power supply device with high power factor, high output and high reliability. There is an effect that can be done.

  The third aspect of the present invention further comprises load state detection means for detecting the magnitude of the load, and the switch control means is one of the first and second opening / closing means corresponding to the magnitude of the load detected by the load state detection means. The pulse signal is output so that the period during which at least one is turned on changes.

  As a result, a high power factor and a high output can always be realized even when the load fluctuates, so that it is possible to provide a power supply device that can comply with IEC harmonic regulations and has a wide load application range. .

  The fourth aspect of the invention further includes power supply frequency detection means for detecting the frequency of the AC power supply voltage, and the switch control means outputs pulses to the first and second opening / closing means according to the frequency detected by the power supply frequency detection means. It changes the on time of the signal.

  As a result, a high power factor and a high output can always be realized regardless of the power supply frequency, so that it is possible to provide a power supply device that can comply with IEC harmonic regulations and has a wide range of power supply and load application. Play.

  According to the air conditioner of the present invention, there is an effect that current utilization is high and high performance can be exhibited.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a circuit configuration diagram showing an embodiment of a power supply device of the present invention. In FIG. 1, 1 is an AC power source, 2 is a reactor for improving the power factor, and 3a to 3d are rectifying elements, which rectify the AC voltage and output a pulsating voltage. 4 is a smoothing capacitor for smoothing the pulsating voltage rectified by the rectifying elements 3a to 3d to obtain a substantially DC voltage, 5 is a power factor improving capacitor for improving the power factor together with the reactor 2, and 6 is for improving the current phase. This is a phase improving capacitor.

  Reference numeral 8 denotes a first switch device connected in series with the power factor improving capacitor 5, and reference numeral 9 denotes a second switch device connected in series with the phase improvement capacitor 6. Here, a semiconductor such as an IGBT or a power MOSFET is used. Consists of switches. Reference numeral 10 denotes a load of the power supply device, which includes a heating wire, an inverter, and a lighting device or a motor that is connected to the inverter and operates. A switch control device 30 controls the first switch device 8 and the second switch device 9, and 32 is an AC voltage detection device that detects the voltage value of the AC power supply 1. Hereinafter, the power supply device of the present invention will be described in detail with reference to FIGS. 1 and 2.

  The AC voltage amplitude value detection device 33 calculates a voltage average value based on the voltage value of at least a half cycle of the AC power supply 1 and outputs the voltage average value to the AC voltage detection device 32. The AC voltage detection device 32 detects a voltage instantaneous value of the AC power supply 1 and sets a voltage reference value that is a timing for starting pulse output based on the effective voltage value input from the AC voltage amplitude value detection device 33. When the detected instantaneous voltage value reaches the voltage reference value, an AC voltage detection signal is output to the switch control device 30.

  When the switch control device 30 receives the AC voltage detection signal from the AC voltage detection device 32, the switch control device 30 outputs a pulse signal for turning on the first switch device 8 and the second switch device 9 for a predetermined time.

  FIG. 2 is a main waveform diagram in the power supply device of the present invention, where Vac is a voltage waveform of the AC power source 1, Iin is a current waveform flowing through the reactor 2, Vc1 is a voltage waveform across the power factor improving capacitor 5, and Vc2 is Voltage waveform at both ends of the phase improving capacitor 6, Vdc is a voltage waveform at both ends of the smoothing capacitor 4, Pac is an AC voltage detection signal of the AC power supply 1 output from the AC voltage detection device 32, and Psw 1 drives the first switch device 8. A pulse signal Psw2 indicates a pulse signal for driving the second switch device 9.

  3 is a current conduction path diagram showing paths through which current flows in each period of the waveform diagram shown in FIG. Hereinafter, the operation in each period will be described in detail with reference to FIGS. 1 to 3.

  Period 1: The voltage Vc1 of the power factor improving capacitor 5 is discharged to some extent during the immediately preceding negative half cycle, and the voltage Vc2 of the phase improving capacitor 6 is charged to approximately -Vdc. When the instantaneous value of AC power supply 1 exceeds the voltage reference value set according to the voltage average value, AC voltage detection device 32 outputs AC voltage detection signal Pac. When the switch control device 30 detects the AC voltage detection signal Pac, the switch control device 30 outputs signals Psw1 and Psw2 for turning on the first switch device 8 and the second switch device 9, respectively.

  After that, the AC power source 1 starts to output a positive voltage, and the voltage Vc2 of the phase improving capacitor 6 is discharged in the order of the AC power source 1, the reactor 2, the phase improving capacitor 6, and the AC power source 1 as shown in FIG. Current Iin flows.

  This operation continues until the voltage Vc2 charged in the phase improving capacitor 6 is discharged to zero and then charged until it reaches the same value as the voltage Vc1 of the power factor improving capacitor 5.

  Period 2: both the power factor improving capacitor 5 and the phase improving capacitor 6 increase the voltage Vac of the AC power source 1 and the AC power source 1, the reactor 2, the power factor improving capacitor 5, and the diode 3d as shown in FIG. In this order, the voltage Vc1 of the power factor improving capacitor 5 is charged in the order of the AC power source 1, and the voltage Vc2 of the phase improving capacitor 6 is charged in the order of the AC power source 1, the reactor 2, the phase improving capacitor 6, and the AC power source 1. A current flows and Iin is the sum of these two currents.

  This operation is continued while the first switch device 8 is in the on state. When the first switch device 8 is in the off state, the power factor correction capacitor 5 is not charged and the current path shown in FIG. Only the phase improving capacitor 6 is charged.

  Period 3: the power supply voltage Vac becomes higher than the voltage Vdc of the smoothing capacitor 4, and the AC power source 1, the reactor 2, the diode 3a, the smoothing capacitor 4, the diode 3d, and the AC power source 1 are smoothed in this order as shown in FIG. A current Iin for charging the voltage Vdc of the capacitor 4 flows. At the end of this period, the second switch device 9 is turned off.

  Period 4: The power factor improving capacitor 5 does not flow because the first switch device 8 is in the off state. In addition, since the voltage of the phase improving capacitor 6 is both charged to approximately Vdc, no current flows. During this period, the energy stored in the reactor 2 in the periods 1, 2, and 3 is released, and as shown in FIG. 3C, the AC power source 1, the reactor 2, the diode 3a, the smoothing capacitor 4, the diode 3d, and the AC power source A current Iin for charging the voltage Vdc of the smoothing capacitor 4 flows in the order of 1.

  Period 5: The voltages of the power factor improving capacitor 5 and the phase improving capacitor 6 are both charged to approximately Vdc. When the AC power source 1 falls below zero and the negative absolute value exceeds a predetermined value, the AC voltage detecting device 32 An AC voltage detection signal Pac is output. When the switch control device 30 detects the AC voltage detection signal Pac, the switch control device 30 outputs signals Psw1 and Psw2 for turning on the first switch device 8 and the second switch device 9, respectively.

  In this period, first, as shown in FIG. 3D, a current Iin for discharging the electric charge of the phase improving capacitor 6 flows in the order of the AC power source 1, the phase improving capacitor 6, the reactor 2, and the AC power source 1. This operation continues until the voltage Vc2 charged in the phase improving capacitor 6 is discharged to zero.

  Period 6: The voltage Vc2 of the phase improving capacitor 6 is discharged to zero, but the voltage Vc1 of the power factor improving capacitor 5 remains charged in a positive half cycle, as shown in FIG. As shown, the AC power source 1, the phase improving capacitor 6, the reactor 2, the current for charging the phase improving capacitor in this order, the AC power source 1, the diode 3c, the smoothing capacitor 4, the power factor improving capacitor 5, and the reactor 2. A current for discharging the power factor correction capacitor 5 flows in the order of the AC power source 1, and Iin is the sum of these two currents.

  This operation is continued while the first switch device 8 is in the on state. When the first switch device 8 is in the off state, the discharge from the power factor correction capacitor 5 is eliminated, and the current path in FIG. Only the phase improving capacitor 6 is charged.

  Period 7: The power supply voltage Vac becomes higher than the voltage Vdc of the smoothing capacitor 4, and the AC power supply 1, reactor 2, diode 3a, smoothing capacitor 4, diode 3d, and AC power supply 1 are smoothed in this order as shown in FIG. A current Iin for charging the voltage Vdc of the capacitor 4 flows. At the end of this period, the second switch device 9 is turned off.

  Period 8: The power factor improving capacitor 5 does not flow because the first switch device 8 is in the off state. Further, since the voltages of the phase improving capacitor 6 are both charged to approximately -Vdc, no current flows. In this period, the energy stored in the reactor 2 in the periods 5, 6 and 7 is released, and as shown in FIG. 3 (f), the AC power source 1, the diode 3c, the smoothing capacitor 4, the diode 3b, the reactor 2, the AC power source A current Iin for charging the voltage Vdc of the smoothing capacitor 4 flows in the order of 1.

  As described above, by repeating the operations in the periods 1 to 8 for each cycle of the AC power supply 1, the rising of the input current can be accelerated and a current waveform having a wide conduction angle can be obtained. Therefore, the power factor can be improved and the harmonic component contained in the input current Iin can be reduced.

  In particular, as compared with the conventional power supply device shown in FIG. 9, when the voltage Vac of the AC power supply 1 rises from zero, the current Iin can be made to flow quickly by the discharge current of the phase improving capacitor 6, and further for power factor improvement. By flowing the current Iin relatively gently by the charging / discharging current of the capacitor 5 and the phase improving capacitor 6, a substantially sinusoidal current waveform can be realized as a whole. Thereby, a very high power factor is realizable compared with the past.

  Furthermore, compared with the power supply device shown in FIG. 9, the amount of increase in energy storage in the reactor 2 in the periods 1 and 4 in FIG. 2, and in addition to the power factor improving capacitor 5 in the periods 2 and 5, the phase improving capacitor 6 Since the increase in the energy accumulation in the reactor 2 due to the increase in charging / discharging to is charged in the smoothing capacitor 4 in the periods 3 and 6, a very large output voltage Vdc can be obtained.

  The output voltage Vdc can be controlled by changing the time for which the first switch device 8 and the second switch device 9 are turned on.

  Further, the AC voltage detection device 32 can set the output timing of the AC voltage detection signal optimally by setting a reference value to be compared according to the size of the AC power supply 1, so that a high power factor is always obtained. be able to.

  As a result, if the circuit constant and the reference value are optimally selected, the output can be changed by clearing the IEC harmonic regulation and controlling the on-time of the first switch device 8, so that loads of various sizes can be obtained. Can also respond.

  As can be seen from the above description, according to the power supply device of the present invention, even if the AC power supply fluctuates, it is possible to reliably perform pulse output at an optimal timing according to each voltage value, so that a high power factor and It is possible to provide a power supply device that achieves high output and has very high reliability.

  In the present embodiment, the AC voltage detection device 32 and the AC voltage amplitude value detection device 33 are configured as individual devices, but the effect of the present invention is not limited to this configuration, and these devices are combined into one device. The same effect can be obtained even with the configuration.

(Embodiment 2)
FIG. 4 is a circuit diagram showing still another embodiment of the power supply device of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 4, reference numeral 21 denotes a DC voltage detection device that detects the voltage Vdc across the smoothing capacitor 4 and is constituted by a resistor or the like. Further, the DC voltage detection device 21 outputs the detected value to the switch control device 30. Hereinafter, the power supply device of the present invention will be described in detail with reference to FIG.

  When an AC voltage is applied to the device, both the first switch device 8 and the second switch device 9 are in the OFF state. The load 10 is disconnected from the power supply device and is in a no-load state. The switch control device 30 stores the voltage value Vdc detected by the DC voltage detection device 21 at this time as the voltage peak value of the AC power supply 1 and determines the output timing of the pulse signals Psw1 and Psw2 based on the voltage peak value. Set the voltage reference value.

  Thereafter, when the load 10 is connected, the switch control device 30 causes the first switch device 8 and the second switch device 9 when the instantaneous value of the AC voltage detected by the AC voltage detection means 32 reaches a preset voltage reference value. The pulse signals (Psw1, Psw2) for turning ON are output.

  As a result, a pulse signal can be output at an optimal timing according to the voltage value of the AC power supply 1 without performing a complicated calculation, so that a high power factor can be obtained. Further, by performing this operation every time the power supply apparatus is stopped, an optimum power factor can always be obtained even if the voltage of the AC power supply 1 varies.

  As can be seen from the above description, according to the power supply device of the present invention, a high power factor and a stable output voltage can be obtained regardless of the voltage value of the AC power supply 1 with a simple configuration and control. And a power supply apparatus with extremely high reliability can be easily provided.

(Embodiment 3)
FIG. 5 is a circuit diagram showing still another embodiment of the power supply device of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 5, reference numeral 20 denotes a load current detection device that detects a current value flowing through the load 10, and is configured by a resistor or the like. Further, the load current detection device 20 outputs the detected value to the switch control device 30. Hereinafter, the power supply device of the present invention will be described in detail with reference to FIG.

  When the load 10 is an inverter and a motor driven at a variable speed by the inverter, the size of the load 10 changes depending on the rotational speed of the motor and the like. Therefore, it is desirable that the power supply device secures a power factor necessary for suppressing harmonics and an output voltage (Vdc) necessary for driving the load 10 in the fluctuation range of the load 10.

  The switch control device 30 can calculate the size of the load 10 by detecting the voltage Vdc across the smoothing capacitor 4 from the output voltage detection device 21 and the current flowing through the load 10 from the load current detection device 20.

  The switch control device 30 controls the first switch device 8 and the second switch device 9 to be turned on in accordance with the size of the load 10 so as to increase the time. For example, the length of a necessary pulse signal may be stored in advance according to the size of the load 10. FIG. 6 shows an example of a pulse width output from the switch control device 30 to the first switch device 8 and the second switch device 9 with respect to the magnitude of the load.

  As a result, if the circuit constant and the on-time of the first switch device 8 and the second switch device 9 are set optimally, a high power factor can be obtained in the entire region of the load 10 and the load varies in size. Can also respond.

  As can be seen from the above description, according to the power supply device of the present invention, a high power factor and output voltage can always be obtained even when the load fluctuates. Therefore, a power supply device with a wide load application range can be provided. it can.

  The on operation of the first switch device 8 and the second switch device 9 described in the present embodiment is an example, and the operation of the power supply device of the present invention is not limited to this.

(Embodiment 4)
A further embodiment of the power supply device of the present invention will be described in detail with reference to FIG. In FIG. 5, the AC voltage detection device 32 can have a function of detecting the voltage value of the AC power source 1 and detecting the frequency.

  For example, the detection interval of the predetermined voltage of the AC power source 1 detected by the AC voltage detection device 32 is measured, and if this value is greater than or equal to a predetermined value, it is determined to be 50 Hz, and if it is less than the predetermined value, it is determined to be 60 Hz It can be easily detected.

  The switch control device 30 obtains the timing of the pulse signal output to turn on the first switch device 8 and the second switch device 9 based on the AC voltage detection signal of the AC power supply 1 detected by the AC voltage detection device 32. A pulse signal width to be output is corrected based on the detected frequency of the AC power source 1.

  For example, as shown in FIG. 7, when pulse signal data corresponding to the size of the load 10 at 60 Hz is set in advance and the frequency of the AC power source 1 detected by the AC voltage detection device 32 is 50 Hz. A value obtained by multiplying 60 Hz pulse signal data by (60/50 = 1.2) is output.

  As a result, an optimal pulse signal can be output according to the size of the load 10 when the power supply frequency of the AC power supply 1 is 50 Hz / 60 Hz.

  As can be seen from the above description, according to the power supply device of the present invention, a high power factor and an output voltage can be always obtained regardless of the power supply frequency and the size of the load. An apparatus can be provided.

  The on operation of the first switch device 8 and the second switch device 9 described in the present embodiment is an example, and the operation of the power supply device of the present invention is not limited to this.

(Embodiment 5)
FIG. 8 shows an example of the configuration of an air conditioner to which any of the inverter control devices of the present invention is applied. 8, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, the air conditioner of the present invention will be described with reference to FIG.

  As shown in FIG. 8, the air conditioner uses the power supply device of the invention shown in the first embodiment as a compressor drive device. In addition to the inverter device 81 and the electric compressor 82 as the load 10, the indoor unit 92, A refrigeration cycle comprising an outdoor unit 95 and a four-way valve 91 is provided.

  The indoor unit 92 includes an indoor heat exchanger 93 and an indoor fan 94, and the outdoor unit 95 includes an outdoor heat exchanger 96, an outdoor fan 97, and an expansion valve 98.

  During the refrigeration cycle, a refrigerant that is a heat medium circulates. The refrigerant is compressed by the electric compressor 82, and heat is exchanged with the outdoor air by blowing from the outdoor blower 97 in the outdoor heat exchanger 96, and indoor air is blown from the indoor blower 94 in the indoor heat exchanger 93. And heat exchange. Indoor air conditioning is performed by the air after heat exchange in the indoor heat exchanger 93. Switching between cooling and heating is performed by reversing the direction of refrigerant circulation by a four-way valve 91.

  The circulation of the refrigerant in the refrigeration cycle as described above is performed by driving the electric compressor 82 by the inverter device 81, and the control method of the inverter device 81 and the electric compressor 82 is the power source of the first embodiment. This is done using a device. Since the configuration and operation of the power supply device are as described above, description thereof will be omitted.

  With the configuration as described above, it is possible to suppress deterioration in control performance such as a decrease in efficiency in the air conditioner.

  In the present embodiment, the air conditioner using the power supply device of the invention shown in the first embodiment as the compressor driving device has been described. However, the power supply device of another invention as shown in the second or fourth embodiment is used. Even if it uses, the air conditioner which had the effect which the power supply device of each invention has similarly can be provided.

  Therefore, the effect of the power supply apparatus according to the present invention can be fully utilized by using it particularly for an air conditioner with a large load change.

  As described above, the power supply device according to the present invention can realize a high power factor and a high output, and therefore can be applied to uses such as an outdoor unit of an air conditioner.

The circuit block diagram in one Example of the power supply device of this invention Main waveform diagram in another embodiment of the power supply device of the present invention (A)-(f) is the current pathway figure in the other Example of the power supply device of this invention. The circuit block diagram in the further another Example of the power supply device of this invention The circuit block diagram in the further another Example of the power supply device of this invention The graph which shows the pulse width of the switch drive signal with respect to the magnitude | size of load in further another Example of the power supply device of this invention The graph which shows the pulse width of the switch drive signal with respect to the magnitude | size of load in further another Example of the power supply device of this invention Configuration of the air conditioner of the present invention Circuit diagram of conventional power supply Main waveform diagram of conventional power supply Current path diagram of conventional power supply

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC power supply 2 Reactor 3a, 3b, 3c, 3d Rectifier 4 Smoothing capacitor 5 Power factor improvement capacitor 6 Phase improvement capacitor 8 First switch device 9 Second switch device 10 Load 20 Load current detection device 21 DC voltage Detection device 30 Switch control device 32 AC voltage detection device 33 AC voltage amplitude value detection device

Claims (5)

A rectifier circuit that rectifies an AC power supply voltage and outputs a pulsating voltage, a reactor connected to the rectifier circuit, first and second opening / closing means for connecting and blocking a current path, and the first opening / closing means Connected in series with the power factor improving capacitor connected between the AC input terminal and the DC output terminal of the rectifier circuit, and connected in series with the second switching means, and between the AC input terminals of the rectifier circuit. A connected phase improving capacitor; a smoothing capacitor that smoothes the output voltage of the rectifier circuit to obtain a substantially DC voltage; an AC voltage detecting means that detects a voltage value of the AC power supply; and an effective value or average value of the AC power supply Or AC voltage amplitude value detecting means for detecting either of the peak values and switch control means for controlling the first and second opening / closing means. The switch control means is detected by the AC voltage detecting means. And a pulse signal for turning on at least one of the first and second switching means in response to the voltage value to be detected and the AC voltage magnitude detected by the previous AC voltage amplitude value detecting means. apparatus. 2. The power supply device according to claim 1, wherein the AC voltage amplitude value detecting means detects the magnitude of the AC power supply from a voltage across the smoothing capacitor in a no-load state after the power is turned on. Load state detection means for detecting the magnitude of the load is further provided, and the switch control means includes at least one of the first and second opening / closing means according to the magnitude of the load detected by the load state detection means. The power supply device according to claim 1, wherein a pulse signal is output so that a period during which the switch is turned on changes. Power supply frequency detection means for detecting the frequency of the AC power supply voltage is further provided, and the switch control means is an on-time of a pulse signal output to the first and second opening / closing means according to the frequency detected by the power supply frequency detection means The power supply device according to claim 1, wherein the power supply device is changed. An air conditioner comprising the power supply device according to any one of claims 1 to 4.

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