JP2000278955A - Power unit and air conditioner using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the higher harmonic components of an input current, by widening the on-angle of an input current by simple control thereby improving power factor. SOLUTION: A power unit is equipped with a rectifying circuit 2, a rector 3, a power factor improving circuit 7 composed of switching elements 4a and 4b, capacitors 5a and 5b, and reverse flow preventive rectifying elements 6a and 6b, a smoothing capacitor 8 obtaining roughly DC voltage by smoothing the output voltage of the power factor improving circuit 7, a pulse signal control means 22 generating and outputting the pulse signal to turn on and turn off the switching elements 4a and 4b, and a drive circuit 23 receiving the pulse signals and driving the switching means of the power factor improving circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for converting an alternating current into a direct current and reducing a harmonic component of an input current to improve a power factor.

[0002]

2. Description of the Related Art Conventionally, as an AC-DC conversion circuit, a capacitor input type rectifier circuit for inputting an AC voltage to a diode rectifier circuit to obtain a pulsating output and smoothing the pulsating output with a capacitor to obtain a DC voltage has been known. Used in various fields. In the capacitor input type rectifier circuit, the input current has a narrow current conduction angle, a low power factor, and there is a lot of reactive power, so it is not possible to use power effectively, and it contains many harmonic components and is connected to the same power supply system Problems with equipment are a problem. Therefore, as a technique for improving a power factor and reducing a harmonic component, there is a power supply device having a circuit configuration shown in FIG.

As shown in FIG. 31 (b), this power supply device inserts a reactor 102 when an AC voltage Vin inputted from an AC power supply 101 is converted into a pulsating output voltage by a rectifier circuit 103, thereby providing an input current Iin. Can be alleviated, and as a result, the current conduction angle increases, so that the power factor can be improved and the harmonic component contained in the input current Iin can be reduced.

As described above, the conventional power supply device shown in FIG. 31 is used for various devices because the power factor can be improved by inserting only passive components having a simple structure.

In recent years, as shown in FIG. 32, a power supply device for improving a power factor using an active element has been used. Hereinafter, the power supply device shown in FIG. 32 will be described.
In FIG. 32A, the control circuit 109 generates and outputs a signal for turning on and off the switching element 107 at a high frequency in order to make the input current a sine wave. The reactor 106 is a high-frequency reactor for making the input current into a sinusoidal wave together with the switching element 107. Diode 108
Prevents the electric charge charged in the smoothing capacitor 104 from flowing backward when the switching element 107 is on.

Hereinafter, the operation of the power supply device will be described. The control circuit 109 compares the detection current from the input current detection circuit (not shown) with a sine wave reference waveform created based on the power supply voltage waveform, and switches the switching element 107 to make the input current sine wave. Generates and outputs a pulse signal for on / off control. The switching element 107 turns on and off according to the pulse signal to repeatedly short and open the reactor 106 to bring the input current closer to the reference waveform. As a result, as shown in FIG. 32 (b), a substantially sinusoidal input current waveform Iin similar to the AC voltage Vin of the AC power supply 101 can be obtained, the power factor can be brought close to 1, and the input current can be reduced. Harmonic components contained in Iin can be greatly reduced.

Further, Japanese Patent Application Laid-Open No. 9-266474, Japanese Patent No. 27463479 or Japanese Patent Application Laid-Open No. 10-1744
There is also a power supply device which significantly simplifies switching control as disclosed in Japanese Patent Publication No. 42 and improves power factor.

FIGS. 33 and 3 show such a power supply device.
4 will be described. In the power supply device shown in FIG. 33A, the reactor 102 is for a low frequency. The control circuit 110 outputs a pulse signal for turning on the switching element 107 for a predetermined time in synchronization with the zero cross point of the AC power supply 101. Thereby, the rectifier circuit 103, the reactor 1
02 and the switching power supply 107
The input current flows from the zero cross point of the AC power supply 101 because a current for short-circuiting 1 flows. When the switching element 107 is turned off, the rectifier circuit 103, the reactor 102, the backflow prevention rectifier element 108, and the smoothing capacitor 1
Current flows through the line 04. As a result, the current conduction angle can be increased, and the power factor can be improved. The control circuit 110 can also output a pulse signal for turning on the switching element 107 with a predetermined time delay from the zero-cross point of the AC power supply 101, and by setting this delay time according to the magnitude of the load, An optimal power factor can be obtained at the load.

The power supply shown in FIG. 34A has capacitors 120a and 120b for improving the power factor. The control circuit 111 outputs a pulse signal for turning on the bidirectional switch 115 for a predetermined time near the zero crossing point of the AC power supply 101. As a result, a charging current flows to the capacitor 120a or 120b via the reactor 102 and the rectifier circuit 103. Since the charging current has an advanced phase, the rising of the input current can be hastened. When the bidirectional switch 115 is turned off, the input current is supplied to the reactor 102, the rectifier circuit 103, and the smoothing capacitor 104.
Flow through. As a result, the current conduction angle of the input current can be increased, and the power factor can be improved.

In the power supply device shown in FIG.
Numeral 11 can change the value of the output voltage by changing the pulse width of the pulse signal. That is, FIG.
The power supply device 4 operates as a full-wave rectifier circuit when the bidirectional switch is off, and operates as a voltage doubler rectifier circuit when the bidirectional switch is on.

Therefore, the control circuit 111 changes the pulse width of the pulse signal so that the output voltage falls within a range of not less than the voltage obtained by full-wave rectification and lower than the voltage obtained by voltage doubler rectification. Can be changed.

[0012]

However, in the power supply device shown in FIG. 31, the power factor can be improved with a simple configuration, but the effect of the improvement is small, and a sufficient power factor cannot be obtained. Also, in order to obtain a high power factor with this circuit configuration, it is necessary to increase the value of the reactor,
This has had the problem of enlarging the components and increasing the resulting loss.

Although the power supply device shown in FIG. 32 can control the power factor to almost 1 by making the input current a sine wave, the control becomes complicated and the switching by high frequency switching accompanying waveform shaping is performed. The loss in the element 107 increases, and furthermore, the noise generated increases, and a strong filter circuit for suppressing the noise is required. As a result, the cost is increased, the loss in the filter circuit is increased, and the efficiency is reduced as a whole. Had issues.

In the power supply device shown in FIG. 33, switching control can be remarkably simplified, but especially at a low load, the current waveform becomes discontinuous as shown in FIG. 33 (b) or is advanced too much. Therefore, by delaying the output timing of the pulse signal from the zero-cross point of the AC power supply for a predetermined time, the optimum power factor can be obtained even at low load, but the delay time and the pulse It is necessary to control both widths, which complicates the control.
At the time of 0V input, the reactor becomes larger, and the loss in the larger reactor increases, and further, the voltage applied to the switching means increases. In addition, there is a problem that the switching loss in the switching element 107 increases.

Further, in the power supply device shown in FIG. 34, the switching control can be greatly simplified and a high power factor can be obtained even at a low load, and the output voltage is higher than the voltage obtained by full-wave rectification. In addition, although the voltage can be boosted within a voltage range lower than the voltage obtained by the voltage doubler rectification, as shown in FIG. There was a problem that a sufficient power factor could not be obtained, and further, an output voltage higher than the voltage obtained by voltage doubler rectification could not be obtained.

The present invention solves such a conventional problem. A high power factor can be obtained by a simple configuration and control without performing high-frequency switching. It is an object of the present invention to provide a power supply device capable of preventing an increase in loss in a filter circuit due to an increase in the power supply, and capable of suppressing harmonics with low loss.

It is another object of the present invention to provide a power supply device that can obtain a high power factor over the entire load even if the switching control is simplified, and can improve the power factor with simple control.

It is still another object of the present invention to provide a power supply device capable of preventing an increase in the size of the reactor, an increase in loss due to the increase in the size of the reactor, and an increase in the size of the switching element even at the time of 200 V input. Moreover, it is an object of the present invention to provide a power supply device that can greatly change the output voltage even if the switching control is simplified and can obtain a sufficient power factor.

[0019]

In order to solve the above problems, a first power supply device according to the present invention comprises: (a) a rectifier circuit for rectifying an output voltage of an AC power supply and converting the output voltage to a DC voltage;
(B) a reactor connected to the rectifier circuit, (c) a power factor improving circuit for inputting an output voltage of the rectifying circuit via the reactor, (the power factor improving circuit includes a plurality of switching elements connected in series. Switching means for turning on and off a current path of an input current flowing from the AC power supply;
A capacitor circuit composed of a plurality of capacitors connected in series, and a backflow prevention rectifying element for preventing a charge charged in the capacitor from flowing back to the switching means when the switching means is in an on state; and The capacitor circuit is arranged in parallel, a connection point between the switching elements and a connection point between the capacitors are connected, and an end point of the switching means and an end point of the capacitor circuit are connected via a backflow prevention rectifying element. A pulse signal control unit that generates and outputs a pulse signal for turning on and off each switching element of the power factor correction circuit, and (e) a switch driving unit that receives the pulse signal and drives the switching unit of the power factor correction circuit.

A second power supply device according to the present invention includes: (a) a rectifier circuit for rectifying an output voltage of an AC power supply to convert it to a DC voltage; and (b) a reactor connected to the rectifier circuit.
(C) a power factor improvement circuit that inputs an output voltage of a rectifier circuit via a reactor, and (a power factor improvement circuit includes a plurality of switching elements connected in series and turns on a current path of an input current flowing from an AC power supply). A switching circuit for turning off, a capacitor circuit comprising a plurality of capacitors connected in series, and a backflow prevention rectifying element for preventing the electric charge charged in the capacitor from flowing back to the switching means when the switching means is on. Is composed of
The switching means and the capacitor circuit are arranged in parallel, a connection point between the switching elements and a connection point between the capacitors are connected, and an end point of the switching means and an end point of the capacitor circuit are connected via a backflow prevention rectifying element.
(D) pulse signal control means for generating and outputting a pulse signal for turning on and off each switching element of the power factor correction circuit, and (e) switch driving means for receiving the pulse signal and driving the switching means of the power factor correction circuit. Is provided. At this time, the pulse signal control means outputs a pulse signal for turning on at least one of the plurality of switching elements of the power factor correction circuit for a predetermined period in a half cycle of the AC power supply voltage. With the above configuration, current can flow even during a period in which there is no current conduction, so that a sufficiently high power factor can be obtained by widening the current conduction angle, and harmonic components are suppressed by an inexpensive and simple configuration and control. As a result, a low-loss power supply device can be provided.

The third power supply according to the present invention may further comprise a zero cross detection means for detecting a zero cross point of the power supply voltage and outputting a zero cross detection signal in the second power supply. At this time, the pulse signal control means preferably outputs a pulse signal for turning on the switching element of the power factor correction circuit for a predetermined time based on the zero cross detection signal from the zero cross detection means.

In a fourth power supply device according to the present invention, in the second or third power supply device, the pulse signal control means generates a pulse signal for turning on each switching element of the power factor correction circuit for a predetermined time, The output pattern of the pulse signal may be switched and output every half cycle of the power supply voltage.

In a fifth power supply device according to the present invention, in the second or third power supply device, the pulse signal control means may turn on one of the switching elements of the power factor correction circuit for a predetermined time. A signal may be generated, and the output pattern of the pulse signal may be switched and output every half cycle of the AC power supply voltage.

In a sixth power supply device according to the present invention, in the second or third power supply device, the pulse signal control means generates a pulse signal for turning on a plurality of switching elements of the power factor correction circuit for different predetermined times. The pulse signal may be generated and output by switching the output pattern of the pulse signal every half cycle of the AC power supply voltage.

According to a seventh power supply device of the present invention, in the second or third power supply device, the pulse signal control means generates a pulse signal for simultaneously turning on all the switching elements of the power factor correction circuit for a predetermined time. Alternatively, the pulse signal may be output every half cycle of the AC power supply voltage.

An eighth power supply device according to the present invention, in any one of the second or fourth to seventh power supply devices, a zero cross detection means for detecting a zero cross point of the power supply voltage and outputting a zero cross detection signal; A detection signal delay unit that receives a zero-cross detection signal from the zero-cross detection unit and outputs a zero-cross delay signal after a lapse of a predetermined time may be further provided. At this time, the pulse signal control means preferably receives a zero-cross delay signal from the detection signal delay means and outputs a pulse signal for turning on at least one of the switching means of the power factor correction circuit for a predetermined time.

A ninth power supply according to the present invention, in any one of the second or fourth to seventh power supplies, may further include a power supply voltage detecting means for detecting a voltage value of the AC power supply voltage. At this time, preferably, when the voltage value obtained from the power supply voltage detection means becomes equal to or more than a predetermined value, the pulse signal control means outputs a pulse signal for turning on at least one of the switching elements of the power factor correction circuit. Output.

A tenth power supply device according to the present invention is the power supply device according to any one of the second and eighth power supply devices, wherein a power supply voltage detection means for detecting a voltage value of an AC power supply voltage, and an output voltage of the power supply device. And a direct-current voltage detecting means. At this time, preferably, when the voltage value obtained from the power supply voltage detection means becomes equal to or more than the DC voltage value obtained from the DC voltage detection means, the pulse signal control means turns off the switching means of the power factor improvement circuit. A pulse signal to be output is output.

The eleventh power supply according to the present invention, in any one of the second or tenth power supply, may further include a load state detecting means for detecting a magnitude of a load.
At this time, preferably, the pulse signal control means changes the pulse width of the pulse signal according to the magnitude of the load obtained from the load state detection means and outputs the pulse signal.

The twelfth power supply device according to the present invention, in any one of the second and tenth power supply devices, may further include a load state detecting means for detecting a magnitude of a load.
At this time, preferably, the pulse signal control means selects and outputs a pulse signal in any one of the second to tenth power supply devices according to the magnitude of the load obtained from the load state detection means.

A thirteenth power supply according to the present invention comprises an eleventh power supply.
Alternatively, in the twelfth power supply device, the load may include a motor device and an inverter device for converting DC to AC in order to supply a drive voltage to the motor device. At this time, the load state detecting means may be an inverter device or a motor.
The amount of change generated due to a change in the state of the data device may be detected.

A fourteenth power supply device according to the present invention has an eleventh power supply.
Any one of the thirteenth to thirteenth power supply devices, further comprising voltage determination means for determining a voltage value of the AC power supply voltage, wherein the pulse signal control means changes an output pattern of the pulse signal in accordance with a determination result of the voltage determination means. Switch

A fifteenth power supply according to the present invention, in any one of the first to fourteenth power supplies, may further include a power supply frequency detecting means for detecting a frequency of the AC power supply voltage. At this time, preferably, the pulse signal control means outputs a pulse signal having a different pulse width according to the frequency detected by the power supply frequency detection means.

A sixteenth power supply according to the present invention, in any one of the first or fifteenth power supply, may further include a smoothing capacitor for smoothing an output voltage of the power factor correction circuit.

An air conditioner according to the present invention uses any one of the above power supply devices as a power supply device.

[0036]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a power supply device according to the present invention. Note that the same reference numerals in all drawings indicate the same or equivalent components or portions.

(Embodiment 1) FIG. 1 is a circuit diagram showing an embodiment of a power supply device according to the present invention. In FIG. 1, a power supply device includes a rectifier circuit 2 for rectifying an AC voltage from an AC power supply 1 and outputting a pulsating voltage, a reactor 3 for improving a power factor, a power factor improving circuit 7, a power factor improving circuit 7, , And a smoothing capacitor 8 for smoothing the output voltage and supplying it to a load 9. The rectifier circuit 2 includes a plurality of rectifier elements 2a, 2b, 2c,
2d. The power factor correction circuit 7 includes two switching elements 4a and 4b connected in series, two capacitors 5a and 5b connected in series, and two backflow prevention rectifying elements 6a and 6b. Two switching elements 4
a, 4b and two capacitors 5a,
5b and the switching element 4
a and the capacitor 5a are connected via the backflow prevention rectifier 6a, and the switching element 4b and the capacitor 5b are connected via the backflow prevention rectifier 6b.

The switching elements 4a and 4b are made of a self-extinguishing semiconductor such as a power transistor, a power MOSFET or an IGBT. Further, specific examples of the load include a heating wire, an inverter, and lighting equipment and a motor connected to the inverter and operating.

Further, the power supply device comprises a switching element 4
a pulse signal control unit 22 that generates and outputs pulse signals for driving the switching elements 4a and 4b; and a switch driving unit 23 that receives the pulse signals from the pulse signal control unit 22 and drives the switching elements 4a and 4b. Pulse signal control unit 22
Is composed of a general-purpose logic circuit or a microcomputer.
The switch driving unit 23 is configured using a transistor, a dedicated IC, or a photocoupler for electrical insulation.

Here, the operation of the pulse signal control unit 22 will be described. The pulse signal control unit 22 generates and outputs a pulse signal that turns on at least one of the two switching elements 4a and 4b in a half cycle of the AC power supply 1.

FIG. 2 is a diagram showing waveforms of a pulse signal output from the pulse signal control unit 22, a power supply voltage, and an input current in the present embodiment. Note that “Vin” indicates the voltage of the AC power supply 1, “Iin” indicates the input current, “Pa” indicates a pulse signal for driving the switching element 4a, and “Pb” indicates a pulse signal for driving the switching element 4b.

In FIG. 2, two switching elements 4
Pulse signals Pa and Pb having the same pulse width are output at the same timing with respect to a and b. As a result, a short-circuit current flows through the rectifier circuit 2, the reactor 3, and the switching elements 4a and 4b during a period where there is no current conduction, and the current conduction angle can be wider than that of the conventional power supply device shown in FIG. . As a result, a sufficiently high power factor can be obtained, and harmonic components contained in the input current can be suppressed.

As described above, according to the power supply device of the present embodiment, a sufficiently high power factor can be obtained by a simple configuration and control, so that the generated noise is small and the loss in the filter circuit and the switching elements 4a and 4b. And a low-loss power supply device can be provided.

(Embodiment 2) FIG. 3 is a circuit diagram showing another embodiment of the power supply device according to the present invention. 3, the power supply device further includes a zero-cross detection unit 21 that detects a zero-cross point of the AC power supply 1 and outputs a zero-cross detection signal in addition to the circuit configuration illustrated in FIG. FIG. 4 shows a configuration of a power supply device showing the zero-cross detection unit 21 more specifically. The zero-crossing detector 21 detects the zero-crossing point of the AC power supply 1 with the resistors 62a, 62b, 63a, 6
3b and the photocouplers 61a and 61b are alternately detected every half cycle. The pulse signal control unit 22 receives the zero-cross detection signal from the zero-cross detection unit 21 and generates and outputs a pulse signal for driving the switching elements 4a and 4b. This is constituted by a general-purpose logic circuit or a microcomputer. The switch drive unit 23 is a pulse signal control unit 22
Switching signals 4a, 4b
Drive.

The operation of the pulse signal control section 22 will be described. The pulse signal control unit 22 generates and outputs two types of pulse signals to turn on the two switching elements 4a and 4b in the half cycle of the AC power supply 1, respectively. At this time, the two types of pulse signals are alternately exchanged every half cycle of the AC power supply 1, and the two switching elements 4a,
By outputting the charging current to the capacitor 4b, the charging current can be alternately and uniformly supplied to the two capacitors 5a and 5b every half cycle, and the current conduction angle can be increased to improve the power factor.

FIG. 5 is a diagram showing waveforms of a pulse signal, a power supply voltage, and an input current output from the pulse signal control unit 22 in the present embodiment. The pulse signal control unit 22 is configured as shown in FIG.
In synchronization with the zero crossing point of the AC power supply 1, the switching element 4 in the positive half cycle of the power supply voltage Vin as shown in FIG.
a, two pulse signals are output to the switching element 4b, and one pulse signal is output to the switching element 4b. On the other hand, in the negative half cycle, the number of these pulse signals is switched. And outputs two pulse signals to the switching element 4b. In this way, the output pattern of the pulse signal is switched every half cycle of the AC power supply 1.

In FIG. 5, in the positive half cycle of the AC power supply 1, the switching elements 4a and 4b are both turned on for a predetermined time in synchronization with the zero cross point of the AC power supply 1 by the pulse signals Pa and Pb. AC power supply 1 via circuit 2, reactor 3 and switching elements 4a, 4b
The input current waveform is
Rises in synchronization with the zero crossing point.

When the pulse signals Pa and Pb are both turned off, the current decreases.
a, the switching element 4a is turned on.
Since the current for charging the capacitor 5b flows through the reactor 3 and the switching element 4a, the current increases again. As a result, the conduction angle of the input current can be increased.

Similarly, in the negative half cycle, the conduction angle of the input current can be increased by flowing the short-circuit current via the reactor 3 and the charging current to the capacitor 5a.

By repeating these operations in each cycle of the AC power supply 1, a sufficiently high power factor can be obtained and harmonic components can be suppressed.

As described above, according to the power supply device of the present embodiment, the pulse signals Pa and Pb output to the two switching elements 4a and 4b are switched every half cycle of the AC power supply 1. Thus, a sufficiently high power factor can be obtained, so that harmonic components included in the input current can be suppressed. In addition, since a short-circuit current via the reactor 3 whose increase in current is relatively steep and a charging current to the capacitor 5a or 5b whose increase in current is relatively slow can be used, these are used together. Various current waveforms can be obtained by combining with changing the circuit constant. As a result, a higher power factor can be obtained.

Further, since the generated noise is small and the increase in the loss in the filter circuit and the switching elements 4a and 4b can be suppressed, a low-loss power supply device can be provided.

In this embodiment, an output pattern in which two and one pulse signals are alternately output to the two switching elements 4a and 4b every half cycle has been described. However, the output pattern is not limited to this. There is no.

(Embodiment 3) FIG. 6 is a waveform diagram of a power supply voltage, an input current, and a voltage across each capacitor (hereinafter referred to as a "main waveform") in still another embodiment of the power supply device according to the present invention.
That. 3) and the waveforms of the pulse signals. FIG. 7 is a diagram showing an aspect of a change in a current path in the power supply device. Hereinafter, the positive half cycle of the power supply voltage is divided into five periods, and the operation in each period will be described in detail with reference to FIGS. 3, 6, and 7. FIG. In the following description, “Va”,
"Vb" is the voltage across the capacitors 5a and 5b,
“Vdc” indicates a voltage across the smoothing capacitor 8.

Period: The pulse signal control unit 22 outputs a pulse signal for turning on one of the two switching elements 4a and 4b for a predetermined time in synchronization with the zero crossing point of the voltage Vin of the AC power supply 1. I do. In the example of FIG. 6, the pulse signal Pa for turning on the switching element 4a
Is output. At this time, the voltage on the load 9 side as viewed from the AC power supply 1 is equal to the voltage Vb across the capacitor 5b, and is approximately ２ of the voltage Vdc across the smoothing capacitor 8. However, during this period, the power supply voltage Vin is
, The current does not flow from the AC power supply 1 to the load side, and the input current Iin does not flow. Period: Power supply voltage Vin is voltage Vb across capacitor 5b
7A, the charging current to the capacitor 5b starts flowing through the current path shown in FIG. 7A, and the current increases until the ON state of the pulse signal ends. At the same time, the voltage Vb across the capacitor 5b becomes To rise. Period: The two switching elements 4a and 4b are both off, and the voltage on the load side as viewed from the AC power supply 1 becomes equal to the voltage Vdc across the smoothing capacitor 8. At this time, the power supply voltage Vin is smaller than Vdc, but the input current Iin decreases due to the energy stored in the reactor 3, but continues to flow. Period: Power supply voltage Vin is voltage V across smoothing capacitor 8
During this time, the input current Iin flows through the current path shown in FIG. 7C to charge the smoothing capacitor 8. Period: The charging of the smoothing capacitor 8 has been completed, and the input current Iin does not flow during this period.

As described above, by performing the operation from the period to the period, the rise of the input current can be accelerated as compared with the related art, and a current waveform having a wide conduction angle can be obtained.

In the negative half cycle of the AC power supply 1, the pulse signal control section 22 outputs a pulse signal Pb for turning on the switching element 4b for a predetermined time. At this time, the voltage on the load side as viewed from the AC power supply 1 becomes equal to the voltage Va across the capacitor 5a, and the power supply voltage Vin becomes larger than Va, as in the positive half cycle of the AC power supply 1 already described. The charging current to the capacitor 5a starts to flow in the current path of (b). Thereafter, the same operation as in the positive half cycle of the AC power supply 1 is performed, whereby the rise of the input current is advanced, and a current waveform having a wide conduction angle can be obtained.

By repeating the above operation for each cycle of the AC power supply 1, a sufficiently high power factor can be obtained and the harmonic components contained in the input current can be reduced.

As described above, according to the power supply device of the present embodiment, the harmonic components included in the input current can be controlled by a very simple control of outputting a single pulse signal in a half cycle of the power supply voltage with a simple configuration. Can be suppressed,
It is possible to provide a low-loss power supply device in which noise generated is small and increase in loss in the filter circuit and the switching elements 4a and 4b is suppressed.

When the present power supply device is used in an apparatus such as an air conditioner, when the AC power supply 1 is 200 V, the voltage applied to the reactor 3 when the switching element 4a or 4b is in the ON state is a capacitor 5a. , 5b are alleviated by the voltages Va and Vb, so that the size of the reactor 3 can be significantly reduced as compared with the conventional power supply device shown in FIG. As a result, the size of the entire device can be reduced, and the loss in the reactor 3 can be reduced. Therefore, the loss of the device can be reduced, which is particularly effective.

(Embodiment 4) FIG. 8 is a diagram showing pulse signals and main waveforms in still another embodiment of the power supply device according to the present invention. Hereinafter, the positive half cycle of the power supply voltage is divided into three periods, and the operation in each period is shown in FIGS.
This will be described in detail with reference to FIG.

Period: In synchronization with the zero crossing point of the voltage Vin of the AC power supply 1, the pulse signal control unit 22 applies the two switching elements 4a and 4b to the switching elements 4a and 4b for different predetermined times.
A pulse signal having a different pulse width is output to turn on. In the example of FIG. 8, first, in synchronization with the detection of the zero-cross point of the AC power supply 1, a pulse signal Pb for turning on the switching element 4b for a relatively short period of time, and the switching element 4a is longer than the switching element 4b and is a half of the AC power supply 1 A pulse signal Pa that is turned on for a period equal to or shorter than the cycle is output. As a result, during the period, the two switching elements 4a and 4b are both turned on, so that the rectifier circuit 2, the reactor 3, and the switching element 4a,
A current for short-circuiting the AC power supply 1 flows through the current path shown in FIG. Period: The switching element 4b is turned off, and the voltage on the load side as viewed from the AC power supply 1 becomes equal to the voltage Vb across the capacitor 5b. At this time, since the power supply voltage Vin is higher than Vb, the reactor 3 is connected along the current path shown in FIG.
, A charging current flows to the capacitor 5b. Period: The charging of the capacitor 5b has been completed, and the input current Iin does not flow during this period.

By performing the operation from period to period as described above, the rise of the input current can be made faster than in the conventional power supply device as in the third embodiment.
A current waveform having a wide conduction angle can be obtained.

In the negative half cycle of the AC power supply 1, the pulse signal control unit 22 detects the zero-cross, and turns on the switching element 4a for a relatively short period of time, contrary to the positive half cycle of the AC power supply 1. Pa and the switching element 4b is longer than the switching element 4a.
, A pulse signal Pb that is turned on for a period equal to or shorter than the half cycle of the pulse signal is output. In this negative half cycle, the same operation as in the positive half cycle is performed, and the input current waveform having a wider conduction angle can be obtained by accelerating the rise of the input current as compared with the related art.

By repeating the above operation for each cycle of the AC power supply 1, a sufficiently high power factor can be obtained and the harmonic component contained in the input current can be reduced.

In the power supply device of the present embodiment, energy is accumulated in the reactor 3 by a short-circuit current passing through the current path of FIG. 7D and passing through the reactor 3 during the period. Energy is accumulated in the capacitors 5a and 5b by the charging current to the capacitor 5b or 5a passing through the current path (b). Therefore, in the power supply device of the present embodiment, a high power factor can be obtained, and an output voltage Vdc sufficiently higher than the voltage Vin of the AC power supply 1 can be obtained, which is higher than the voltage obtained by voltage doubler rectification. Output voltage can be obtained.

As described above, according to the power supply device of the present embodiment, a pulse signal having a different pulse width is output once to each of the two switching elements 4a and 4b in a half cycle of the power supply voltage. Since the current conduction angle can be increased by appropriate control, a sufficiently high power factor can be obtained.

Further, since the generated noise is small and the increase in the loss in the filter circuit and the switching elements 4a and 4b can be suppressed, the loss can be reduced. Moreover, since the output voltage can be boosted even more than the voltage obtained by voltage doubler rectification, a power supply device that can cope with a load requiring a high DC voltage can be provided.

In the power supply device according to the third embodiment, as shown in FIG. 9, a pulse signal for turning on the switching element for a period longer than a half cycle of the AC power supply 1 is generated, and this pulse signal is converted to an AC signal. By alternately switching and outputting the output every half cycle of the power supply 1, the same operation as the power supply device of the present invention can be performed, and the same effect can be obtained.

Further, in the power supply device of the present invention, by controlling the pulse widths of the two pulse signals Pa and Pb having different pulse widths within a range not exceeding a half cycle of the power supply voltage, the power supply can be obtained with a high power factor improving effect. The output voltage value of the device can be controlled in a wide range.

(Embodiment 5) FIG. 10 is a diagram showing pulse signals and main waveforms in still another embodiment of the power supply device according to the present invention. Hereinafter, the present embodiment will be described in detail with reference to FIGS. 3, 7, and 10. FIG.

In the example shown in FIG.
1 and a pulse signal P having the same pulse width is applied to both of the two switching elements 4a and 4b in synchronization with the zero-crossing detection signal.
a and Pb are output simultaneously. As a result, when both the switching elements 4a and 4b are in the ON state, the rectifier circuit 2, the reactor 3, and the switching elements 4a and 4b
Since the short-circuit current flows in the current path (d), the input current Iin can flow even near the zero-cross point of the AC power supply 1 where there is no current conduction. For this reason, the input current Iin can be started in synchronization with the zero-cross point, so that the current conduction angle can be greatly widened to obtain a sufficiently high power factor, and the harmonic component contained in the input current Iin can be reduced. Can be.

Therefore, as can be seen from FIGS. 3, 7, and 10, according to the power supply device of the present embodiment, the simple control that the two switching elements 4a and 4b are simultaneously turned on in a half cycle of the power supply voltage is achieved. Since the current conduction angle can be increased, a sufficiently high power factor can be obtained. As a result, harmonic components included in the input current can be significantly reduced.

Further, the noise generated is small and the loss in the filter circuit and the switching elements 4a and 4b is suppressed from increasing, so that the loss is low. In addition, energy can be stored in the reactor 3 by the short-circuit current flowing through the reactor 3, and the output can be reduced. The voltage Vdc can be increased.

Since the switching elements 4a and 4b are connected in series in the circuit configuration of the present embodiment, the voltage applied to each of the switching elements 4a and 4b is half that of the conventional example shown in FIG. Become. For this reason, since each of the switching elements 4a and 4b can use the one with a small withstand voltage, the miniaturization of each component can be achieved. As a result, downsizing of the entire device can be achieved.

Further, since the voltage applied to each of switching elements 4a and 4b is half that of the conventional example shown in FIG. 33, the switching loss in each of switching elements 4a and 4b can be further reduced. At the time of load, the loss of the device can be further reduced. Note that this effect is not limited to the embodiment of the present invention, and the same effect can be obtained in the embodiment of the power supply device of another invention.

(Embodiment 6) FIG. 11 is a circuit configuration diagram showing still another embodiment of the power supply device according to the present invention. 11, in the circuit configuration shown in FIG. 3, the power supply device receives a zero-crossing detection signal from the zero-crossing detecting unit 21 and delays the received zero-crossing detecting signal by a predetermined time to generate a zero-crossing delay signal.
Further provided with a detection signal delay unit 24 for outputting the detection signal. The detection signal delay unit 24 is configured by a delay circuit using a charging time constant by a capacitor and a resistor, an IC or a microcomputer having a timer function, or the like.

Hereinafter, the power supply device shown in FIG. 11 will be described. The pulse signal control unit 22 receives the zero-cross delay signal delayed by a predetermined time from the zero-cross point obtained from the detection signal delay unit 24, and changes the pulse signal to turn on at least one of the switching elements 4a and 4b for a predetermined time. Output.

FIG. 12 shows a pulse signal and a main waveform diagram in the power supply device of the present embodiment. In the example of FIG. 12, in the positive half cycle of the AC power supply 1, the switching element 4a is turned on by a part of the second half phase of the half cycle by the pulse signal Pa, and in the negative half cycle, the switching element 4b is turned on by the pulse signal Pb. It is turned on in a part of the latter half phase of the half cycle.

As can be seen from the input current waveform Iin in FIG. 12, by delaying the pulse signal, the pulse signal can be output at the same timing every half cycle of the power supply voltage even in the latter half phase portion of the input current. The charging current flows to 5a and 5b, and the current conduction angle can be widened.

Therefore, according to the power supply device of this embodiment, the input current can flow in an arbitrary half-cycle phase section by delaying the pulse signal from the zero-cross point of the AC power supply 1 for a predetermined time. Outputting a pulse signal during a non-conduction period can greatly increase the current conduction angle, and is particularly effective because a high power factor can be obtained. In addition, a low-noise, simple configuration power supply device can be provided because the noise is low, the filter circuit can be simplified, and the loss in the switching means is small. Further, by combining with the pulse signal control in the above embodiment, the current conduction angle can be further widened, so that the power factor can be greatly improved and the harmonic components can be further suppressed.

(Embodiment 7) FIG. 13 is a circuit diagram showing still another embodiment of the power supply device according to the present invention. 13, the power supply device includes a power supply voltage detection unit 25 that detects a voltage value of the AC power supply 1 in addition to the circuit configuration illustrated in FIG. The power supply voltage detection unit 25 is configured using a resistor or the like or a transformer if insulation is necessary, and the AC voltage value Vin or the voltage value | Vin of the output pulsating voltage of the rectifier circuit 2 is used.
| Etc. are detected. Hereinafter, the power supply device of the present embodiment will be described in detail with reference to FIG.

The pulse signal control section 22 is connected to the power supply voltage detection section 2
5 and outputs a pulse signal for turning on at least one of the switching elements 4a and 4b for a predetermined time in synchronism with the fact that the value has reached a predetermined value. As a result, a pulse signal can be output at the same timing every time in each half cycle of the AC power supply 1, so that the current conduction angle can be accurately increased in each cycle of the AC power supply 1. Therefore, since a high power factor can be obtained, harmonic components can be more accurately suppressed. Thereby, a highly reliable power supply device can be obtained.

Therefore, according to the power supply device of the present invention, instead of the zero cross point detected by the zero cross detection unit 21,
By performing control to output a pulse signal based on the fact that the voltage value of the AC power supply 1 obtained from the power supply voltage detection unit 25 has reached a predetermined value, it is possible to obtain the same effect as in the second to sixth embodiments. Can be. Normally, when the voltage value of the AC power supply 1 fluctuates, the output voltage Vdc
However, in the present power supply device, when the power supply voltage fluctuates to compare the voltage value of the AC power supply 1 with a predetermined value, the output timing of the pulse signal automatically changes.

That is, since the output timing of the pulse signal is advanced when the power supply voltage increases, the switching elements 4a and 4b are turned on when the power supply voltage is lower than usual. As a result, the reactor 3 or the capacitors 5a, 5a
b, the output voltage Vdc
Is decreasing. Conversely, when the power supply voltage decreases, the output timing of the pulse signal is delayed, so that when the power supply voltage is higher than usual, the switching elements 4a and 4b are turned on. As a result, the amount of energy stored in the reactor 3 or the capacitors 5a and 5b increases, so that the output voltage Vdc tends to increase. Therefore, in the power supply device of the present embodiment, the output voltage can be kept substantially constant with a small fluctuation of the power supply voltage, and there is an effect that the power supply device is strong against disturbance.

(Embodiment 8) FIG. 14 is a circuit configuration diagram showing still another embodiment of the power supply device according to the present invention. 14, the power supply device further includes a DC voltage detection unit 26 that detects a voltage Vdc across the smoothing capacitor 8 in addition to the circuit configuration illustrated in FIG. The DC voltage detector 26 is simply composed of a resistor or the like. The output of the DC voltage detector 26 is taken in by a microcomputer or the like using an A / D converter. Since the DC voltage detection unit 26 aims to detect the output voltage of the power supply device, that is, the voltage supplied to the load, in a circuit configuration having no smoothing capacitor 8, the voltage Vdc across the smoothing capacitor 8 is used.
Instead, the output voltage of the power factor improvement circuit 7 may be detected. FIG. 15 is a diagram showing pulse signals and main waveforms in the power supply device of the present embodiment.

Hereinafter, the positive half cycle of the power supply voltage is divided into four periods, and the operation in each period will be described in detail with reference to FIGS. 7, 14 and 15.

Period: In synchronization with the zero crossing point of the voltage Vin of the AC power supply 1, the pulse signal control unit 22 causes one of the two switching elements 4a and 4b to switch the voltage value Vin of the AC power supply 1 to both ends of the smoothing capacitor 8. A pulse signal to be turned on until a value equal to or higher than the voltage Vdc is output. FIG.
In the example, a pulse signal Pa is output to turn on the switching element 4a in the positive half cycle. At this time,
The voltage on the load side as viewed from the AC power supply 1 is equal to the voltage Vb across the capacitor 5b, and is approximately の of the voltage Vdc across the smoothing capacitor 8. However, during this period, the power supply voltage Vin is lower than the voltage Vb across the capacitor 5b, and there is no current conduction from the AC power supply 1 to the load side. Period: Power supply voltage Vin is voltage Vb across capacitor 5b
7A, the charging current to the capacitor 5b starts flowing through the current path shown in FIG. 7A, and the current increases until the ON state of the pulse signal ends. In the meantime, the power supply voltage Vin rises and eventually becomes equal to the voltage Vdc across the smoothing capacitor 8. At this time, the switching element 4a is turned off. This operation is performed by the pulse signal control unit 2
In step 2, the detection is performed by detecting that the power supply voltage value obtained from the power supply voltage detection unit 25 is equal to or higher than the DC voltage value obtained from the DC voltage detection unit 26, that is, the voltage Vdc across the smoothing capacitor 8. Period: The two switching elements 4a and 4b are both off, and the voltage on the load side as viewed from the AC power supply 1 becomes equal to the voltage Vdc across the smoothing capacitor 8. At this time, the power supply voltage Vin is equal to Vdc, and thereafter, as the power supply voltage Vin increases, the input current Iin flows through the current path shown in FIG. Period: The charging of the smoothing capacitor 8 has been completed, and during this period, no current flows and the non-conductive state is established.

By performing the operation from the period described above, the rise of the input current Iin can be advanced more than before, so that a current waveform with a wide conduction angle can be obtained and the period and the period are switched. Thus, a smoother current waveform can be obtained without causing a sharp current waveform as shown in FIG. 6 of the third embodiment.

In the negative half cycle of the AC power supply 1, the pulse signal control unit 22 turns on the switching element 4b until the voltage value Vin of the AC power supply 1 becomes equal to or higher than the voltage Vdc across the smoothing capacitor 8. The signal Pb is output. Also in this case, by performing the same operation as the positive half cycle,
The conduction angle is wide, and a smoother current waveform without sharpness can be obtained.

By repeating the above operation for each cycle of the AC power supply 1, the current conduction angle can be increased and the sharpness of the current waveform can be eliminated. Therefore, a very high power factor can be obtained, and harmonic components included in the input current can be further reduced.

Therefore, according to the power supply device of the present embodiment,
The conduction angle of the input current can be increased by a very simple control of outputting one pulse signal in a half cycle of the power supply voltage. Further, since the timing of switching the pulse signal from the on state to the off state can be always optimized, the sharpness of the current waveform can be eliminated. As a result, a smooth current waveform can be obtained, and harmonic components included in the input current can be significantly reduced.

Further, the power supply device has low noise, the filter circuit can be simplified, and the switching is performed once every half cycle of the AC power supply 1, so that the loss in the switching elements 4a and 4b can be reduced. , Low loss can be realized. It should be noted that also in the power supply devices according to the first to seventh embodiments, the voltage of the smoothing capacitor 8 is detected and the timing of the pulse signal is controlled by comparing the power supply voltage Vin with the voltage Vdc across the smoothing capacitor. The idea of can be adapted.

(Embodiment 9) FIG. 16 is a circuit diagram showing still another embodiment of the power supply device according to the present invention. In FIG. 16, in addition to the circuit configuration shown in FIG. 3, the power supply device includes a DC voltage detection unit 26 that detects and outputs a voltage Vdc across the smoothing capacitor 8, and a load state detection unit 27 that detects the size of the load. And further comprising: The load state detector 27 calculates the magnitude of the load from the voltage Vdc across the smoothing capacitor 8 obtained from the DC voltage detector 26 and the load current obtained from the load current detector 71 composed of a resistor or a current transformer. I do. The pulse signal control unit 22 reads outputs from the load state detection unit 27 and the DC voltage detection unit 26, and switches the switching elements 4a and 4b.
And outputs a pulse signal for driving.

Hereinafter, this power supply device will be described in more detail. The pulse signal control unit 22 includes a load state detection unit 27
The pulse width of the pulse signal output to turn on the switching elements 4a and 4b is changed according to the magnitude of the load obtained. For example, in controlling the pulse width in the power supply device according to the third embodiment, the load state detection unit 27
The pulse width may be changed in proportion to the magnitude of the load obtained from. In addition, a pulse width that can maximize the power factor or efficiency is set in advance in accordance with a predetermined load size, and a pulse having a predetermined pulse width set according to the detected load size is set. A signal may be output. Alternatively, in the power supply device according to the fourth embodiment,
A pulse width is set in advance so that the output voltage has a predetermined value in accordance with the size of the load, and a pulse signal having a predetermined pulse width set according to the detected size of the load is output. You may do so. In particular, since the pulse signal control unit 22 detects the value of the voltage Vdc across the smoothing capacitor 8 from the DC voltage detection unit 26, it is possible to confirm whether or not a predetermined output voltage is obtained, so that the output is more reliably performed The voltage can be controlled.

The power supply device of the present embodiment can be used in combination with the power supply device of the above-described embodiment, whereby the same effects as those of the above-described invention can be obtained over the entire load. Therefore, according to the present power supply device, by changing the pulse width in proportion to the magnitude of the load, the control can be simplified, and a sufficiently high power factor can be obtained over the entire load. This makes it possible to suppress harmonics over the entire load area by simple control. In addition, a pulse width that can maximize the power factor or efficiency is set in advance in accordance with the size of each load, and a pulse having a predetermined pulse width set according to the detected load size is set. By outputting the signal, the power factor or efficiency can be greatly improved over the entire load. As a result, harmonic components can be significantly reduced. Also, it is possible to suppress harmonics and reduce the loss of the device. Furthermore, a pulse width that can set the output voltage to a predetermined value is set in advance in accordance with the size of the load, and a pulse signal having a predetermined pulse width set according to the detected size of the load is set. By outputting, an arbitrary output voltage can be obtained over the entire load. As a result, it is also possible to suppress harmonic components and increase output.

In this embodiment, the load state detector 2
7 calculates the size of the load from the voltage across the smoothing capacitor 8 obtained from the DC voltage detection unit 26 and the load current obtained from the load current detection unit 71 including a resistor or a current transformer. The load detection method in the power supply device of the present invention is not limited to this, and the detection method can be calculated from the output voltage, the output current, the input current, the current flowing through the switching means, and the like. It can also be detected by calculating

(Embodiment 10) FIG. 17 is a circuit diagram showing still another embodiment of the power supply device according to the present invention. The power supply device shown in FIG. 17 differs from the power supply device of the ninth embodiment in that pulse signal control section 22 outputs a pulse signal based only on a detection signal from load state detection section 27.

Hereinafter, the power supply device shown in FIG. 17 will be described in more detail. The pulse signal control unit 22 includes the load state detection unit 2
According to the magnitude of the load obtained from FIG. 7, the pulse signal output to turn on the switching elements 4a and 4b is set to any one of the pulse signal output patterns in the power supply device according to the first to ninth embodiments. Select and output.

FIG. 18 is a diagram showing a pulse signal output by the pulse signal control unit 22 and a main waveform diagram at that time in the power supply device of the present embodiment. In FIG.
"Pa1" and "Pa2" are pulse signals for driving the switching element 4a, "Pb1" and "Pb2" are the switching elements 4a.
b shows a pulse signal for driving b.

In FIG. 17, when the magnitude W of the load detected by the load state detector 27 is equal to or smaller than the predetermined value Y1, a pulse signal having the output pattern shown in the third embodiment is output. When the magnitude W is equal to or larger than the predetermined value Y1, a pulse signal having the output pattern shown in the fourth embodiment is output.

That is, if W ≦ Y1, the pulse signal control unit 22
Are pulse signals Pa1 and Pb1 as shown in FIG.
Is output. When W ≧ Y1, the pulse signal control unit 22
Are pulse signals Pa2 and Pb2 as shown in FIG.
Is output.

Thus, the load W is equal to or less than the predetermined value Y1 (W
In the region of ≦ Y1), a high power factor can be obtained, and the output voltage can be kept almost constant at a voltage obtained by the full-wave rectification. In addition, in a region where the load W is equal to or more than the predetermined value Y1, a high power factor can be obtained, and a voltage value larger than a voltage obtained by doubling the output voltage can be obtained. As a result, the output voltage can be changed according to the size of the load.

Further, as shown in the ninth embodiment, in the region of W ≧ Y1, the pulse width is increased in proportion to the magnitude W of the load, so that the output voltage is doubled from the voltage value obtained by full-wave rectification. It can be gradually changed to a voltage value larger than the voltage obtained by the voltage rectification.

Further, another predetermined value Y2 is set,
When the magnitude of the load is equal to or less than Y2, both of the pulse signals may be turned off. That is, when W ≦ Y2, the pulse signal control unit 22 does not output a pulse signal. On the other hand, Y2 ≦ W
If ≦ Y1, the pulse signal control unit 22 outputs pulse signals Pa1 and Pb1 as shown in FIG. further,
When W ≧ Y1, the pulse signal control unit 22 outputs pulse signals Pa2 and Pb2 as shown in FIG.

Thus, in the above embodiment, in the region where the magnitude W of the load is equal to or less than Y2, the switching element 4a,
Since there is no current conduction to the switching element 4b, it is possible to reduce the loss in this switching element, so that it is possible to reduce the loss of the device.

Therefore, in the power supply device of the present invention, a high power factor can be obtained over the entire load by comparing the magnitude W of the load with a predetermined value and changing the output pulse signal according to the magnitude of the magnitude. Can be suppressed, and the output voltage can be changed according to the size of the load. Further, the loss can be further reduced by turning off the pulse signal in a low load region.

As a result, even with respect to a load whose magnitude varies, the harmonic component can be suppressed in the entire variation range, and the output voltage can be varied.
Higher output can be realized.

Further, since the circuit configuration and control of the power supply device can be simplified, the noise generated is small and the filter circuit can be simplified, and the loss in the switching means is small and the loss can be reduced.

The output pattern of the pulse signal in the power supply device of the present embodiment is different from that of the first to ninth embodiments.
May be used in combination.

In the present embodiment, the load state detector 27 calculates the magnitude of the load from the voltage across the smoothing capacitor 8 obtained from the DC voltage detector 26 and the load current obtained from the load current detector 71. However, the load detection method is not limited to this. As a detection method, for example, it is also possible to calculate from the output voltage, output current, input current, current flowing in the switching element, pulse width, and the like of the power supply device, or to detect by combining these. be able to.

(Embodiment 11) FIG. 19 is a circuit diagram showing still another embodiment of the power supply device of the present invention. In FIG. 19, the power supply device includes an inverter device 10 and a load state detection unit 27 in addition to the circuit configuration shown in FIG.
The inverter device 10 is composed of a plurality of semiconductor elements.
By switching this semiconductor element at a high frequency, the substantially DC voltage Vdc across the smoothing capacitor 8 is converted into a variable voltage / variable frequency AC voltage. As a semiconductor element, similarly to the switching elements 4a and 4b of the power factor correction circuit 7, a power transistor, a power MOSFET, an IGB
A self-extinguishing semiconductor such as T is used. The variable voltage / variable frequency AC voltage output from the inverter device 10 is supplied to the motor device 11 for variable speed driving. The motor device 11 uses a DC brushless motor.

The load state detecting section 27 comprises an inverter control section 3, an inverter driving section 31, and a position detecting section 32. The position detecting unit 32 is a motor device 11, that is, DC.
It detects the rotor position of the brushless motor and outputs a position detection signal, and is composed of a hall sensor, an encoder, and the like. The inverter control unit 30 includes a position detection unit 32
It generates and outputs a control signal for driving the inverter device 10 based on the position detection signal from the microcomputer, and is constituted by a microcomputer or the like. The inverter driving section 31 drives a semiconductor element of the inverter device 10 based on the control signal generated and output by the inverter control section 30.

The pulse signal control section 22 generates and outputs a pulse signal for driving the switching elements 4a and 4b. In this example, the inverter control section 30 which is a component of the load state detection section 27 detects the pulse signal. The load status is also read.

Hereinafter, the power supply device of FIG. 19 will be described in more detail. The inverter control unit 30 receives a speed command signal from the outside and a position detection signal from the position detection unit 32 and controls the inverter device 10 to control the motor device 11 to a predetermined speed. Generate

In the case of a compressor motor used for an air conditioner or the like as the motor device 11 driven at a variable speed by the inverter device 10, the load torque increases in accordance with the speed and the motor increases. Since the back electromotive force generated in the winding increases, the voltage and current applied to the motor device 11 increase, and the output power increases. Accordingly, the input power and input current of the AC power supply 1 also increase.

On the other hand, in the power factor improvement circuit 7, the pulse signal control section 22 outputs a pulse signal for driving the switching elements 4a and 4b in order to improve the power factor of the input current. It is greatly affected by the pulse width of this pulse signal. Therefore, in order to maximize the power factor or the efficiency, it is necessary to output a pulse signal having an optimum pulse width, and the optimum pulse width of the pulse signal differs depending on the size of a load, a circuit constant, and the like.

Therefore, it is important to control the pulse width of the pulse signal in accordance with the magnitude of the load in order to obtain the maximum power factor or efficiency over the entire load variation range of the motor device 11. In the present embodiment, as a method of detecting the magnitude of the load, calculation is performed based on the speed of the motor device 11 obtained from the detection interval of the position detection signal output from the position detection unit 32.

For this, for example, a pulse width capable of maximizing the power factor or efficiency with respect to the speed of the motor device 11 is set in advance. Then, the pulse signal control unit 22 may output a pulse signal having a predetermined pulse width set in advance according to the detected speed of the motor device 11. If the optimum pulse width is almost proportional to the speed of the motor device 11, the pulse signal control section 22 makes the pulse signal proportional to the detected speed of the motor device 11, as shown in FIG. May be controlled.

Therefore, according to the power supply device of the present invention, the magnitude of the load is calculated based on the speed of the motor device 11, and a pulse width capable of maximizing the power factor or the efficiency is set in advance for this speed. In addition, since a predetermined pulse signal is output according to the detected speed of the motor device 11, a sufficient power factor or efficiency can be obtained in the entire operation range of the motor device 11. As a result, a harmonic component of the input current can be sufficiently reduced in the entire operation range of the motor device 11, and a low-loss motor driving power supply device can be realized. In addition, the generated noise is small, and an increase in loss in the filter circuit and the switching elements 4a and 4b can be suppressed.

The optimum pulse width is almost equal to that of the motor device 1.
In the case of being proportional to the speed of 1, the pulse width of the pulse signal is controlled in proportion to the detected speed of the motor device 11, so that the power factor is also sufficient in the entire operation range of the motor device 11. Alternatively, efficiency can be obtained. Moreover, in this case, the pulse width of the pulse signal can be expressed by a linear expression with respect to the speed of the motor device 11, so that the pulse width control can be further simplified. As a result, the harmonic component of the input current can be sufficiently reduced by simple control over the entire operation range of the motor device 11, and a low-loss motor driving power supply device can be realized.

(Embodiment 12) FIGS. 19 and 21,
Still another embodiment of the power supply device of the present invention will be described with reference to FIGS.

In the present embodiment, the magnitude of the load on the motor device 11 is detected based on the magnitude of the input current of the AC power supply 1.
The magnitude of this input current increases in accordance with the magnitude of the load on the motor device 11, and the detection method is an input current detection section (not shown) such as a resistor or a current transformer provided on the current conduction path. Is detected by In the following description, the operation mode based on the pulse signal shown in the third embodiment is called "full-wave rectification mode", and the operation mode based on the pulse signal shown in the fourth embodiment is called "double voltage rectification mode".

In FIG. 21, after starting the motor device 11,
The pulse signal control unit 22 of the power factor correction circuit 7 is a full-wave rectifier mode.
To improve the power factor. In this case, for example, if the voltage value of the AC power supply 1 is 200 V, the voltage Vdc across the smoothing capacitor 8 has a value of approximately 280 V.

The input current increases due to an increase in the load on the motor device 11. The pulse signal control unit 22 controls the pulse width of the pulse signal according to the magnitude of the load, that is, the magnitude of the input current so as to maximize the power factor or the efficiency. During this time, the inverter control unit 30 controls the motor device 11 to a predetermined speed based on an external speed command signal, so that the pulse duration of the high-frequency pulse signal for driving each semiconductor element of the inverter device 10 is controlled. Inverter PWM (Pulse Width Modulatio) for controlling the motor device 11 to a predetermined speed by controlling the motor and controlling the voltage applied to the motor device 11.
n) Perform control.

When the pulse duty of the high-frequency pulse signal output from the inverter control unit 30 reaches a predetermined value, for example, 100% with an increase in the load, the voltage supply to the motor device 11 becomes saturated, The speed of the motor device 11 cannot be increased any more. Therefore, in order to increase the speed of the motor device 11, in order to supply a larger voltage, it is necessary to increase the output voltage of the power factor improving circuit 7, that is, the voltage Vdc across the smoothing capacitor 8. Therefore, hereinafter, the power factor improving circuit 7 by the pulse signal control unit 22
Of the smoothing capacitor 8 by the pulse signal control of
Inverter PAM (Pulse Amplitude Modulation) control for controlling the motor device 11 to a predetermined speed by controlling dc to adjust the voltage applied to the motor device 11 is performed.

Next, another control method according to this embodiment will be described with reference to FIG. In FIG. 22, after the motor device 11 is started, the pulse signal control unit 2 of the power factor correction circuit 7 is started.
2 improves the power factor in the full-wave rectification mode. In this case, for example, if the voltage value of the AC power supply 1 is 100 V, the voltage Vdc across the smoothing capacitor 8 has a value of approximately 140 V.

The input current increases due to an increase in the load on the motor device 11. The pulse signal control unit 22 controls the pulse width of the pulse signal according to the magnitude of the load, that is, the magnitude of the input current so as to maximize the power factor or the efficiency. During this time, the inverter control unit 30 performs inverter PWM control to control the motor device 11 at a predetermined speed based on an external speed command signal.

[0129] Then, as the load increases, the inverter 1
When the pulse duty of 0 reaches a predetermined value, for example, 100%, the voltage supply to the motor device 11 becomes saturated, and when the speed of the motor device 11 cannot be further increased, the pulse signal is output. The voltage Vd across the smoothing capacitor 8 is controlled by the pulse signal control of the power factor improvement circuit 7 by the control unit 22.
c to control the motor device 11 to a predetermined speed by adjusting the voltage applied to the motor device 11.
Control is performed.

However, when the voltage value of the AC power supply 1 is 100 V, the control range of the output voltage Vdc, that is, the supply voltage to the motor device 11 is limited in the full-wave rectification mode, and the The speed cannot be improved sufficiently. Therefore, the pulse signal control unit 22 can obtain a greater boosting effect by switching the output pulse signal from the full-wave rectification mode to the voltage doubler rectification mode. In this voltage doubler rectification mode, the value of the output voltage Vdc is equal to 2
It can be controlled by the pulse width of two pulse signals output to the two switching elements 4a and 4b. 100V due to the large boosting effect of this double voltage rectification mode
At the time of input, the same output voltage Vd as at 200V input
c can be obtained, and the inverter PAM can be obtained over a wider range.
Control can be performed.

The switching between the full-wave rectification mode and the voltage doubler rectification mode is not always performed at the point where the pulse duty of the high-frequency pulse signal output from the inverter control unit 30 becomes 100%. As shown in FIG. 23, the mode switching point may be different before and after the point of 100% pulse duty.

Further, by providing hysteresis at the switching point between the full-wave rectification mode and the voltage doubler rectification mode, the mode change is complicated due to unstable operation near the mode switching point. Can be prevented.

Therefore, according to the power supply device of the present embodiment, in addition to the improvement of the power factor in the full-wave rectification mode by the pulse signal control unit 22, the inverter PWM is used in a region where the load on the motor device 11 is small. Since the speed control of the motor device 11 is performed by the control and the speed control by the inverter PAM control is performed in a region where the load is large, a sufficient power factor can be obtained in the entire operation range of the motor device 11. In particular, in the inverter PAM control region, an increase in loss due to switching can be suppressed.
In addition, low loss in the motor device 11 can be realized. In addition, the output voltage Vdc can be improved.

As a result, a power supply device capable of sufficiently suppressing the harmonic component of the input current in the entire operation range of the motor device 11 and driving the motor device 11 with high efficiency and high output is realized. be able to. In addition, the noise generated is small with simple control, and an increase in loss in the filter circuit and the switching elements 4a and 4b can be suppressed.

In a region where the load on the motor device 11 is small, the power factor is improved by the full-wave rectification mode and the speed of the motor device 11 is controlled by the inverter PWM control. Since the power factor is improved by the voltage rectification mode and the speed is controlled by the inverter PAM control, a sufficient power factor can be obtained in the entire operation range of the motor device 11 and the double voltage rectification mode is used. Since the inverter PAM control can be performed over a wide range by a large boosting effect, the inverter device 10 and the motor
In addition, it is possible to suppress an increase in loss due to switching in the power supply device 11, and to greatly improve the output voltage Vdc.

Thus, a power supply capable of sufficiently suppressing the harmonic components of the input current over the entire operating range of the motor device 11 and driving the motor device 11 with high efficiency and high output over a wide range. The device can be realized. In addition, the noise generated is small with simple control, and an increase in loss in the filter circuit and the switching elements 4a and 4b can be suppressed.

In this embodiment, the form of the pulse signal output from the pulse signal control unit 22 is not limited to the present embodiment, but may be any combination of the above-described embodiments as needed. . Further, in the above embodiments 11 and 12, the motor device 11 uses a DC brushless motor, but the motor device 11 in the power supply device of the present invention is not limited to this and other devices such as an induction motor. A similar effect can be obtained with a motor device. The configuration of the load state detection unit 27 is not limited to the configuration shown in FIG. In the eleventh and twelfth embodiments, the speed of the motor device 11 and the magnitude of the input current of the AC power supply 1 are used as a method of detecting the load state. However, the output pulse duty, output frequency,
An output current value, a voltage applied to the motor device 11, a current, or the like may be used. Further, the same effect can be obtained by detecting the magnitude of the load by a combination of these.

(Embodiment 13) Referring to FIG. 24, still another embodiment of the power supply device according to the present invention will be described. The power supply device of the present embodiment includes a power supply voltage determining unit 25 'in addition to the circuit configuration shown in FIG. The pulse signal control unit 22 generates and outputs a pulse signal for driving the switching elements 4a and 4b. In the present embodiment, the voltage value of the AC power supply 1 detected by the power supply voltage determination unit 25 'and the load state detection unit 27 The load state detected by the inverter control unit 30 as a component is also read.

Hereinafter, the power supply device shown in FIG. 24 will be described in more detail. The power supply voltage determination unit 25 'detects the voltage value of the AC power supply 1 from the pulsating voltage output from the rectifier circuit 2, and determines the magnitude relationship between the voltage value and a predetermined value. For example, the power supply voltage determining unit 25 'compares the detected voltage value with a predetermined value,
As a result, when it is determined that the power supply voltage is 200 V, control suitable for the case where the power supply voltage is 200 V is performed. That is, as shown in FIG. 21, the pulse signal control unit 22 controls a pulse signal to be output so as to improve the power factor in the full-wave rectification mode. Inverter PWM control and in a high load region, inverter PAM control is performed to control the speed of the motor device 11.

If the voltage value determined by the power supply voltage determining unit 25 'is 100V, control suitable for the case where the power supply voltage is 100V is performed. That is, the speed control of the motor device 11 is performed as follows. FIG. 22 or FIG.
As shown in FIG.
Numeral 2 controls a pulse signal output so as to improve the power factor in the full-wave rectification mode, and the inverter control section 30 performs inverter PWM control. In the middle and high load range, the pulse signal controller 22 performs power factor improvement in the voltage doubler rectification mode, and the inverter controller 30 performs inverter PAM control.

Therefore, according to the power supply device of the present embodiment, the control method of the power factor improvement circuit 7 and the inverter device 10 is switched according to the voltage value of the AC power supply 1 determined by the power supply voltage determination unit 25 '. By changing it, a sufficient power factor can be obtained in the entire operation range of the motor device 11 irrespective of the voltage value of the AC power supply 1. In addition, the loss can be reduced and the output voltage Vdc can be improved.

As a result, the voltage value of AC power supply 1 becomes 100
V or 200V, the same circuit configuration
It is possible to realize a power supply device capable of sufficiently suppressing harmonic components in the entire operation range of the motor device 11 and driving the motor device 11 with high efficiency and high output. In addition, the noise generated is small with simple control, and an increase in loss in the filter circuit and the switching elements 4a and 4b can be suppressed.

In this embodiment, when the voltage value of the AC power supply 1 is 100 V, the control method shown in FIG.
At the time of 200 V, the control method shown in FIG. 21 was used.
Other control methods may be combined.

(Embodiment 14) FIG. 25 is a circuit diagram showing still another embodiment of the power supply device according to the present invention. The power supply device of the present embodiment further includes a power supply frequency detection unit 28 that detects the frequency of the AC power supply 1 and outputs a frequency detection signal, in addition to the circuit configuration illustrated in FIG. Also,
The pulse signal control unit 22 generates and outputs a pulse signal for driving the switching elements 4a and 4b, and also reads a frequency detection signal from the power supply frequency detection unit 28.

Hereinafter, the power supply device shown in FIG. 25 will be described in more detail. When the AC power supply 1 is a commercial power supply, its frequency is either 50 Hz or 60 Hz. Since these have different periods of one cycle, the optimum pulse width for maximizing the power factor or efficiency differs for each frequency even if the size of the load 9 is the same.

Therefore, in order for the power supply to obtain a sufficient power factor or efficiency irrespective of the frequency of the AC power supply 1, the pulse signal control section 22 outputs a pulse signal having an optimum pulse width corresponding to each frequency. There must be.

In the power supply device of the present embodiment, as shown in FIG. 26, an optimum pulse width for maximizing the power factor or efficiency is set in advance for each frequency of the AC power supply 1. Then, the pulse signal detection unit 22 receives the frequency detection signal of the AC power supply 1 detected by the power supply frequency detection unit 28 and outputs an optimal pulse signal corresponding to the frequency detected from preset pulse signals. Alternatively, a reference frequency is provided, and an optimal pulse signal corresponding to this frequency is set in advance. If the frequency detected by the power supply frequency detector 28 is different from the reference frequency, the optimum pulse signal is easily obtained by calculating the pulse signal corresponding to the preset reference frequency at a predetermined ratio. . For example, if the reference frequency is 60 Hz and the frequency detected by the power supply frequency detection unit 28 is 50 Hz, a predetermined ratio (for example, 60 Hz / 50 Hz = 1.
(2 times) to find and output an optimal pulse signal for 50 Hz.

According to the power supply device of this embodiment, the pulse width for optimizing the power factor or the efficiency is set for each frequency of the AC power supply 1, and the pulse signal control unit 22 optimizes the pulse width according to the detected frequency. Since a pulse signal having an appropriate pulse width is output, a sufficient power factor or efficiency can be obtained regardless of the frequency of the AC power supply 1. Thereby, the AC power supply 1
It is possible to sufficiently suppress the harmonic component of the input current without having to change the setting again with the frequency.

In addition, an optimum pulse signal corresponding to the reference frequency is set in advance, and if the detected frequency is different from the reference frequency, a predetermined pulse signal is set for the reference pulse signal set by the pulse signal control unit 22. Thus, a sufficient power factor or efficiency can be obtained regardless of the frequency of the AC power supply 1. This allows
Even if pulse signals for all frequencies are not set, harmonic components of the input current can be sufficiently suppressed regardless of the frequency of the AC power supply 1.

In this embodiment, instead of setting an optimum pulse signal in advance in accordance with the size of the load, the pulse width of the pulse signal can be more easily changed in proportion to the size of the load. Pulse control corresponding to the frequency of the AC power supply 1 can be performed. In the present embodiment, the power supply frequency detection unit 28 is newly provided. However, the same effect can be obtained by calculating the frequency of the AC power supply 1 from the detection interval of the zero cross detection signal output from the zero cross detection unit 21. it can.

(Embodiment 15) FIG. 27 shows a configuration example of an air conditioner to which any of the power supply devices of the present invention is applied. As shown in FIG. 27, the air conditioner uses the power supply device shown in the first embodiment as a converter device, and includes an indoor unit 92 in addition to an inverter device 81 and an electric compressor 82.
A refrigeration cycle including 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 blower 94, and the outdoor unit 95 includes an outdoor heat exchanger 96, an outdoor blower 97, and an expansion valve 98. During the refrigeration cycle, a refrigerant as a heat medium circulates. The refrigerant is compressed by the electric compressor 82, exchanges heat with outdoor air in the outdoor heat exchanger 96 by blowing from the outdoor blower 97, and in the indoor heat exchanger 93 by blowing air from the indoor blower 94. Heat exchange with. The indoor air is cooled and heated by the air after the heat exchange in the indoor heat exchanger 93. Switching between cooling and heating is performed by reversing the circulation direction of the refrigerant by the 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 supply of electric power to the inverter device 81 and the electric compressor 82 is performed by the converter device. This is performed using the power supply device according to the first embodiment. The configuration and operation of the power supply device are as described above.

With the above configuration, the harmonic component of the input current in the air conditioner can be suppressed. Also,
An air conditioner with low noise and low loss can be provided.

In this embodiment, the power supply device shown in Embodiment 1 is used as the converter device. However, the effects of each power supply device can be similarly obtained by using other power supply devices shown in Embodiments 2 to 14. An air conditioner having the above can be provided.

For example, in the power supply of the present invention, the AC power supply 1
Is 200 V, the size of the reactor 3 can be reduced by suppressing harmonics as shown in the third embodiment. Therefore, the same reactor 3 as that at the time of 100V input can be used.

Further, as shown in Embodiment 4, even if the AC power supply 1 is 100 V, it is possible to suppress harmonics and obtain an output voltage higher than the voltage obtained by voltage doubler rectification. Therefore, even with a 100 V input, an output voltage equivalent to that at a 200 V input can be obtained without the need for a voltage doubler rectifier circuit. In addition, as shown in the ninth to twelfth embodiments, by changing the control method of the pulse width and the pulse signal according to the size of the load, it is possible to obtain the optimum output voltage, power factor and efficiency over the entire load. it can.

The power supply device of the present embodiment can be used for both air conditioners of 100 V model and 200 V model, in particular, to obtain a high power factor and suppress harmonic components contained in the input current. Can be. In addition, the circuit configuration and components can be shared, which has a very great effect that the number of development steps and the number of parts can be greatly reduced.

In the power supply devices according to the first to fifteenth embodiments, the same effect can be obtained in the circuit configuration shown in FIG. 28 in which the values of the capacitors 5a and 5b are changed and the smoothing capacitor 8 is omitted. . FIG. 29 shows a current path in the circuit configuration of FIG. Furthermore, in the power supply devices according to the first to fifteenth embodiments, the reactor 3 is connected to the pulsating current output side of the rectifier circuit 2;
As shown in (1), the same effect can be obtained by connecting to the AC input side of the rectifier circuit 2.

[0158]

According to the first power supply device of the present invention, since the current conduction angle can be widened, harmonic components can be suppressed, and noise can be reduced with a simple configuration and control. A power supply device that achieves low loss can be realized.

According to the second power supply device of the present invention, a current can flow even during a period when there is no current conduction, so that the current conduction angle can be widened and harmonic components can be suppressed. Is simple, it is possible to realize a power supply device with low noise and low loss.

According to the third power supply device of the present invention, a pulse signal can be output at the same timing every half cycle of the power supply voltage with a simple configuration, so that the power factor improving operation can be reliably performed. A highly reliable power supply device can be realized.

According to the fourth power supply device of the present invention, the charging current flows uniformly to each capacitor via the reactor every half cycle of the power supply voltage, and the current conduction angle is widened to obtain a high power factor. Therefore, harmonic components can be suppressed. As a result, since the configuration and the control are simple, it is possible to realize a highly reliable power supply device with small generated noise and low loss.

According to the fifth power supply device of the present invention, the charging current flows evenly to each capacitor via the reactor while the pulse signal is on every half cycle, and the charging current is such that the power supply voltage is approximately equal to the output voltage. Since the current flows from a point exceeding half the value, the current flows at an earlier timing. As a result, the current conduction angle can be widened, and harmonic components can be suppressed. And it ’s very easy to control,
It is possible to realize a power supply device that generates extremely small noise and has low loss.

According to the sixth power supply of the present invention, the current conduction angle can be widened by the short-circuit current of the reactor and the charging current to the capacitor, so that harmonic components can be suppressed. Further, the effect of accumulating energy in the reactor due to the short-circuit current of the reactor and the effect of accumulating energy in the capacitor due to the charging current of the capacitor can be made synergistic, so that a very large boosting action can be provided. Moreover, by changing the pulse width of the pulse signal, the output voltage can be changed over a wide range. As a result, since the configuration and the control are simple, the power supply device can generate a small noise, have a low loss, high reliability, can cope with a load requiring a high output voltage, and has a very wide output voltage range. Is provided.

According to the seventh power supply device of the present invention, the current conduction angle can be widened by forcibly flowing the short-circuit current through the reactor during the period when there is no current conduction. , It is possible to greatly increase the current conduction angle and suppress harmonic components.
Moreover, since the configuration and control are simple, the generated noise is small, the loss is low and the reliability is high, and the output voltage of the power supply device can be boosted by the energy storage effect in the reactor due to the short-circuit current. A power supply device having a wide range can be realized.

According to the eighth power supply device of the present invention, a short-circuit current via a reactor or a charging current to a capacitor via a reactor can flow from an arbitrary point in a half cycle of a power supply voltage. A current can be caused to flow at the same timing every half cycle in a period without conduction. As a result, the current conduction angle can be greatly increased, harmonic components can be largely suppressed, and the configuration and control are simple, so that a power supply device with low noise, low loss, and high reliability can be realized. .

According to the ninth power supply device of the present invention, a pulse signal can be output at the same timing every half cycle of the power supply voltage, so that the current conduction angle can be widened and harmonic components can be surely suppressed. Can be. Also, the output timing of the pulse signal changes according to the increase or decrease of the power supply voltage, and this change acts in a direction to keep the output voltage constant. Can be omitted. As a result,
Since the configuration and control are simple, the generated noise is small,
A power supply device having low loss, high reliability, and capable of coping with fluctuations in power supply voltage can be realized.

According to the tenth power supply of the present invention, the sharpness of the current waveform generated when the switching means is turned off can be suppressed, so that the current waveform can be smoothed. As a result, since the configuration and the control are simple, it is possible to realize a power supply device that has low loss and high reliability, and that greatly suppresses harmonic components included in the input current with a smooth current waveform.

According to the eleventh power supply device of the present invention, it is possible to obtain a sufficiently high power factor over the entire load by suppressing the harmonic components by performing the optimal pulse control, and to reduce the loss or to reduce Any output voltage can be obtained within the range. As a result, both a high power factor and high efficiency can be achieved, and a power supply device capable of high output can be realized.

According to the twelfth power supply device of the present invention, the pulse signal to be output can be changed in accordance with the magnitude of the load. A high power factor can be obtained and harmonic components can be suppressed. Further, since the output voltage can be changed according to the size of the load, higher output can be realized. Moreover, since the circuit configuration and the control are simple, the noise generated is small and the filter circuit can be simplified, and the loss in the switching means is small and the loss can be reduced. As a result, it is possible to realize a power supply device that has low noise, low loss, high reliability, and can cope with a load whose size varies.

According to the thirteenth power supply device of the present invention, the pulse control that maximizes the power factor or the efficiency according to the magnitude of the load on the motor device calculated from the detected change amount is performed. -A sufficient power factor or efficiency can be obtained over the entire operating range of the motor device. As a result, a harmonic component of the input current can be sufficiently suppressed over the entire operation range of the motor device, and a low-loss power supply device can be realized because the generated noise is small.

According to the fourteenth power supply device of the present invention, the power factor is determined by judging the magnitude of the voltage value of the AC power supply and switching and outputting the optimum pulse signal output pattern in accordance with the voltage value. To improve. As a result, for example, whether the power supply voltage is 100 V or 200 V, the same circuit configuration can be used.

According to the fifteenth power supply of the present invention, an optimum pulse signal can be output according to the frequency of the AC power supply, and a sufficient power factor or efficiency can be obtained regardless of the frequency. As a result, it is possible to realize a power supply device that sufficiently suppresses the harmonic component of the input current irrespective of the frequency of the AC power supply and generates low noise because the generated noise is small.

According to the sixteenth power supply of the present invention, a pulsating component contained in the DC voltage from the power factor improving circuit is eliminated by the smoothing capacitor, so that a higher quality DC voltage can be output.

According to the air conditioner of the present invention, an air conditioner having a high power factor, a low harmonic component and a low loss can be realized.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a power supply device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a pulse signal and main waveforms in Embodiment 1 of the power supply device of the present invention.

FIG. 3 is a circuit configuration diagram in Embodiment 2 of the power supply device of the present invention.

FIG. 4 is a circuit configuration diagram of the power supply device of the present invention, and particularly shows a specific configuration of a zero-cross detection unit.

FIG. 5 is a diagram showing pulse signals and main waveforms in a power supply device according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a pulse signal and main waveforms in a power supply device according to a third embodiment of the present invention.

7 (a) to 7 (d) are current path diagrams in one configuration example of the power supply device of the present invention.

FIG. 8 is a diagram showing pulse signals and main waveforms in a power supply device according to a fourth embodiment of the present invention.

FIG. 9 is a diagram showing another pulse signal and main waveforms in a power supply device according to a fourth embodiment of the present invention.

FIG. 10 is a diagram showing a pulse signal and main waveforms in a power supply device according to a fifth embodiment of the present invention.

FIG. 11 is a circuit diagram of a power supply device according to a sixth embodiment of the present invention.

FIG. 12 is a diagram showing a pulse signal and main waveforms in a power supply device according to a sixth embodiment of the present invention.

FIG. 13 is a circuit diagram of a power supply device according to a seventh embodiment of the present invention.

FIG. 14 is a circuit diagram of a power supply device according to an eighth embodiment of the present invention.

FIG. 15 is a diagram showing a pulse signal and main waveforms in a power supply device according to an eighth embodiment of the present invention.

FIG. 16 is a circuit diagram of a power supply device according to a ninth embodiment of the present invention.

FIG. 17 is a circuit diagram of a power supply device according to a tenth embodiment of the present invention.

FIG. 18 is a diagram showing pulse signals and main waveforms in a power supply device according to a tenth embodiment of the present invention.

FIG. 19 is a circuit diagram of a power supply device according to Embodiment 11 (and Embodiment 12) of the present invention.

FIG. 20 is a diagram showing a pulse width of a pulse signal output by the pulse signal control means with respect to the speed of the motor device.

FIG. 21 is a diagram showing a control mode of a power factor improvement circuit for a load and a speed control of the motor device by the inverter device.

FIG. 22 is a diagram showing a control mode of a power factor improvement circuit for a load and a speed control of the motor device by an inverter device.

FIG. 23 is a diagram showing a control mode of a power factor improvement circuit for a load and a speed control of the motor device by the inverter device.

FIG. 24 is a circuit diagram of a power supply device according to a thirteenth embodiment of the present invention.

FIG. 25 is a circuit diagram of a power supply device according to a fourteenth embodiment of the present invention.

FIG. 26 is a diagram showing a pulse width of a pulse signal output by the pulse signal control means with respect to the speed of the motor device.

FIG. 27 is a block diagram of a configuration showing an embodiment of an air conditioner of the present invention.

FIG. 28 is a diagram showing another configuration example of the power supply device of the present invention.

29 (a) to (d) are current path diagrams in another configuration example of the power supply device of the present invention.

FIG. 30 is a diagram showing still another configuration example of the power supply device of the present invention.

FIG. 31A is a circuit configuration diagram showing an example of a conventional power supply device, and FIG. 31B is a main waveform diagram thereof.

32 (a) is a circuit configuration diagram showing another example of a conventional power supply device, and FIG. 32 (b) is a main waveform diagram thereof.

FIG. 33 (a) is a circuit configuration diagram showing still another example of the conventional power supply device, and FIG. 33 (b) is a main waveform diagram thereof.

34A is a circuit configuration diagram showing still another example of the conventional power supply device, and FIG. 34B is a main waveform diagram thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Rectifier circuit 2a, 2b, 2c, 2d Rectifier 3 Reactor 4a, 4b Switching 5a, 5b Capacitor 6a, 6b Backflow prevention rectifier 7 Power factor improvement circuit 8 Smoothing capacitor 9 Load 10 Inverter 11 Data unit 21 zero-cross detection unit 22 pulse signal control unit 23 switch drive unit 24 detection signal delay unit 25 power supply voltage detection unit 25 'power supply voltage determination unit 26 DC voltage detection unit 27 load state detection unit 28 power supply frequency detection unit 30 inverter Inverter control unit 31 Inverter drive unit 32 Position detection unit 71 Load current detection unit 81 Inverter device 82 Electric compressor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference)

Claims (17)

[Claims] 1. A rectifier circuit for rectifying an output voltage of an AC power supply and converting it to a DC voltage, (b) a reactor connected to the rectifier circuit, and (c) a reactor for converting an output voltage of the rectifier circuit to a reactor. A power factor improvement circuit input through the power factor correction circuit, the power factor improvement circuit comprising a plurality of switching elements connected in series, turning on a current path of an input current flowing from the AC power supply,
A switching circuit for turning off, a capacitor circuit including a plurality of capacitors connected in series, and a backflow prevention rectifier for preventing electric charges charged in the capacitor from flowing back to the switching means when the switching means is on. And the switching means and the capacitor circuit are arranged in parallel, a connection point between the switching elements and a connection point between the capacitors are connected, and an end point of the switching means and an end point of the capacitor circuit are connected. (D) a pulse signal control means for generating and outputting a pulse signal for turning on and off each switching element of the power factor correction circuit, and (e) receiving the pulse signal and receiving the pulse signal. Switch driving means for driving the switching means of the power factor correction circuit. Power supply and butterflies. 2. A rectifier circuit for rectifying an output voltage of an AC power supply to convert it to a DC voltage, (b) a reactor connected to the rectifier circuit, and (c) a reactor for converting an output voltage of the rectifier circuit to a reactor. A power factor improvement circuit input through the power factor correction circuit, the power factor improvement circuit comprising a plurality of switching elements connected in series, turning on a current path of an input current flowing from the AC power supply,
A switching circuit for turning off, a capacitor circuit including a plurality of capacitors connected in series, and a backflow prevention rectifier for preventing electric charges charged in the capacitor from flowing back to the switching means when the switching means is on. And the switching means and the capacitor circuit are arranged in parallel, a connection point between the switching elements and a connection point between the capacitors are connected, and an end point of the switching means and an end point of the capacitor circuit are connected. (D) a pulse signal control means for generating and outputting a pulse signal for turning on and off each switching element of the power factor correction circuit, wherein the pulse signal control means is connected via the backflow prevention rectifier element; In a half cycle of the power factor correction circuit, Both outputs a pulse signal for turning on the one predetermined time, the power supply apparatus characterized by comprising a switch drive means for driving the switching means of the power factor correction circuit receiving the (e) said pulse signal. 3. A zero-cross detecting means for detecting a zero-crossing point of a power supply voltage and outputting a zero-crossing detecting signal, wherein the pulse signal control means performs the power factor correction based on the zero-crossing detecting signal from the zero-crossing detecting means. 3. The power supply device according to claim 2, wherein a pulse signal for turning on a switching element of the circuit for a predetermined time is output. 4. The pulse signal control means generates a pulse signal for turning on each switching element of the power factor correction circuit for a predetermined time, and switches and outputs an output pattern of the pulse signal every half cycle of the AC power supply voltage. The power supply device according to claim 2, wherein 5. The pulse signal control means generates a pulse signal for turning on one of the switching elements of the power factor correction circuit for a predetermined time, and generates the pulse signal every half cycle of the AC power supply voltage. The power supply device according to claim 2, wherein an output pattern is switched and output. 6. The pulse signal control means generates a pulse signal for turning on a plurality of switching elements of the power factor correction circuit for different predetermined times, and outputs an output pattern of the pulse signal every half cycle of the AC power supply voltage. The power supply device according to claim 2 or 3, wherein the power supply is switched and output. 7. The pulse signal control means generates a pulse signal that simultaneously turns on all of the switching elements of the power factor correction circuit for a predetermined time, and outputs the pulse signal every half cycle of the AC power supply voltage. Claim 2
Or the power supply device according to claim 3. 8. A zero-crossing detecting means for detecting a zero-crossing point of a power supply voltage and outputting a zero-crossing detecting signal, and a detecting signal delaying means for receiving a zero-crossing detecting signal from the zero-crossing detecting means and outputting a zero-crossing delay signal after a predetermined time has elapsed. Wherein the pulse signal control means receives a zero-cross delay signal from the detection signal delay means and outputs a pulse signal for turning on at least one of the switching means of the power factor correction circuit for a predetermined time. The power supply device according to claim 2 or any one of claims 4 to 7. 9. A power supply voltage detecting means for detecting a voltage value of an AC power supply voltage, wherein when the voltage value obtained from the power supply voltage detecting means becomes equal to or more than a predetermined value, the pulse signal control means sets the pulse signal control means to 8. A pulse signal for turning on at least one of the switching elements of the power factor correction circuit is output.
The power supply device according to any one of the above. 10. A power supply voltage detecting means for detecting a voltage value of an AC power supply voltage, and a DC voltage detecting means for detecting an output voltage of a power supply device, wherein the voltage value obtained from the power supply voltage detecting means is The pulse signal control means outputs a pulse signal for turning off the switching means of the power factor correction circuit when the DC voltage value becomes equal to or more than the DC voltage value obtained from the DC voltage detection means. Item 9. The power supply device according to any one of items 8. 11. The apparatus according to claim 1, further comprising a load state detecting means for detecting a magnitude of the load, wherein said pulse signal control means changes a pulse width of the pulse signal in accordance with the magnitude of the load obtained from said load state detecting means. The power supply according to any one of claims 2 to 10, wherein the power is output. 12. The apparatus according to claim 2, further comprising a load state detecting means for detecting a magnitude of a load, wherein said pulse signal control means is adapted to a magnitude of a load obtained from said load state detecting means. A power supply device that selects and outputs the pulse signal described in any one of the above. 13. The load device comprises a motor device and an inverter device for converting a direct current into an alternating current in order to supply a drive voltage to the motor device, and the load state detecting means comprises the inverter device or the motor. 2. A method according to claim 1, wherein the amount of change occurring due to a change in the state of the monitoring device is detected.
13. The power supply device according to 1 or 12. 14. The apparatus according to claim 1, further comprising a voltage discriminating means for discriminating a voltage value of the AC power supply voltage, wherein said pulse signal control means switches an output pattern of the pulse signal according to a discrimination result of said voltage discriminating means. The power supply device according to any one of claims 11 to 13. 15. A power supply frequency detecting means for detecting a frequency of an AC power supply voltage, wherein the pulse signal control means outputs a pulse signal having a different pulse width according to the frequency detected by the power supply frequency detecting means. The power supply device according to any one of claims 1 to 14, wherein: 16. The power supply device according to claim 1, further comprising a smoothing capacitor for smoothing an output voltage of the power factor correction circuit. 17. An air conditioner comprising the power supply device according to claim 1. Description: