JP2010029048A - Dc power supply apparatus, inverter apparatus equipped with it, air handling unit, washing machine, and wash dryer equipped with inverter apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-loss and highly efficient DC power supply apparatus for generating an output of voltage which is almost 4 times a peak value of AC voltage of an AC power supply by using no opening/closing means or controlling a small number of opening and closing means while controlling these opening/closing means appropriately. <P>SOLUTION: An AC power supply 1 is connected to a bridge rectifying circuit 3, which carries out full wave rectification of the AC power supply, through a reactor 2. An output end thereof is connected in parallel with two first capacitors 4a and 4b, which are connected in series, while both ends thereof are connected in parallel with two second capacitors 6a and 6b, which are connected in series, through adverse current obstructing means 5a and 5b, respectively. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a DC power supply device that boosts an output voltage to an input voltage and supplies it to a load, an inverter device including the same, an air conditioner including the inverter device, a washing machine, and a washing and drying machine.

  Some conventional DC power supply devices obtain a DC output voltage that is at least four times the peak value of the power supply voltage while controlling the power factor to approximately 1 (see, for example, Non-Patent Document 1 and Non-Patent Document 2).

Electrical Engineering D, Vol. 125, No. 1, 2005, 113-114 Electrical Engineering D, Vol. 126, No. 1, 2006, 90-91

  The technique of Non-Patent Document 1 can improve the input power factor with a single opening / closing means, but has a problem that the number of diodes is large, a voltage drop due to the diodes occurs, and the efficiency deteriorates. In addition, although it is possible to output a DC voltage that is four times or more the peak value of the power supply voltage, a DC voltage of 566 V or more is generated in the case of 100 V AC, and 622 V or more when the AC voltage changes to 110 V due to fluctuations in the power supply voltage. There is a problem that a withstand voltage of 600V is exceeded, and the inverter power module of the inverter generally used is often used.

  The technology of Non-Patent Document 2 can control the power factor to approximately 1, but since four open / close means are provided, not only an increase in loss and cost is expected, but also the control becomes complicated and high performance is achieved. Has a problem that a simple microcomputer is required. Further, similarly to Non-Patent Document 1, there is a problem that the withstand voltage of the power module exceeds 600V.

The present invention has been made in order to solve the above-described problems, and a first object is to provide a peak of AC voltage of an AC power source by controlling the number of switching means that have no or few switching means. A DC power supply device capable of outputting a voltage approximately four times the value is obtained.
A second object is to obtain a low-loss and high-efficiency DC power supply device by suppressing deterioration of efficiency due to voltage drop by using a small number of switching means, and appropriately controlling these switching means. It is.
A third object is to obtain an inverter device that enables low-loss and high-efficiency driving of an electric motor connected to the output side by providing the above-described DC power supply device. By providing, a high-performance and energy-saving air conditioner, washing machine and washing / drying machine are obtained.

  The direct current power supply device according to the present invention includes a rectifier circuit for full-wave rectification of an alternating current power supply via a reactor, two first capacitors connected in series connected in parallel to an output terminal of the rectifier circuit, Two second capacitors connected in series, connected in parallel via two backflow blocking means connected across the two first capacitors connected in series, and the two connected in series A connection point of two first capacitors and one of the AC input terminals of the rectifier circuit, and a connection point of the two second capacitors connected in series and the other of the AC input terminals of the rectifier circuit Is connected, and a voltage approximately four times the peak value of the AC voltage of the AC power supply is output to a load connected in parallel across the two second capacitors connected in series.

  The DC power supply device according to the present invention can output a DC voltage that is approximately four times the peak value of the AC voltage of the AC power supply with a small number of components, and can supply a DC power supply device with low loss and high efficiency. Furthermore, for example, when an inverter that drives an electric motor is connected to the DC power supply device according to the present invention, since the output voltage of the inverter is increased, the inverter can drive an electric motor having a high induced voltage to a high speed range. . Further, when the induced voltage is increased, the current flowing through the electric motor and the inverter is reduced, so that high efficiency and energy saving can be achieved, which can contribute to global warming countermeasures.

Embodiment 1 FIG.
FIG. 1 is a circuit diagram of a DC power supply apparatus according to Embodiment 1 of the present invention. The AC power source 1 is connected via a reactor 2 to a bridge rectifier circuit 3 that performs full-wave rectification of the AC power source. The bridge rectifier circuit 3 includes rectifier diodes 3a, 3b, 3c, and 3d. Two first capacitors 4 a and 4 b connected in series are connected in parallel to the output terminal of the bridge rectifier circuit 3. The connection point between the two first capacitors 4 a and 4 b is connected to one of the AC input terminals of the bridge rectifier circuit 3. Further, two second capacitors 6a and 6b connected in series are connected in parallel to both ends of the two first capacitors 4a and 4b connected in series via backflow blocking means 5a and 5b, respectively. It is connected. The connection point between the two second capacitors 6 a and 6 b is connected to the other AC input terminal of the bridge rectifier circuit 3. A load 7 is connected in parallel to both ends of the two second capacitors 6a and 6b connected in series.

2, 3 and 4 are diagrams showing the operation of the circuit of FIG.
In FIG. 2, when the AC power source 1 is negative, current flows in the order of the AC power source 1, the rectifying diode 3b, the first capacitor 4a, and the reactor 2 (broken line in FIG. 2). Then, the first capacitor 4a is charged with a substantially peak value of the AC voltage of the AC power source 1. Next, when the AC power source 1 is positive, a current flows in the order of the AC power source 1, the reactor 2, the first capacitor 4a, the backflow prevention means 5a, and the second capacitor 6a (solid line in FIG. 2). Then, the second capacitor 6a is charged with a voltage obtained by adding the approximate peak value of the AC voltage of the AC power supply 1 and the charging voltage of the first capacitor 4a. Since the first capacitor 4a is charged with a substantially peak value of the AC voltage of the AC power source 1, the second capacitor 6a is charged with a voltage approximately twice the peak value of the AC voltage of the AC power source 1. It will be.

  In FIG. 3, when the AC power supply 1 is positive, current flows in the order of the AC power supply 1, the reactor 2, the first capacitor 4b, and the rectifying diode 3d (solid line in FIG. 3). As a result, the first capacitor 4b is charged with a substantially peak value of the AC voltage of the AC power supply 1. Next, when the AC power source 1 is negative, current flows in the order of the AC power source 1, the second capacitor 6b, the backflow prevention means 5b, the first capacitor 4b, and the reactor 2 (broken line in FIG. 3). Then, the second capacitor 6b is charged with a voltage obtained by adding the approximate peak value of the AC voltage of the AC power supply 1 and the charging voltage of the first capacitor 4b. Since the first capacitor 4b is charged with the approximate peak value of the AC voltage of the AC power supply 1, the second capacitor 6b is charged with a voltage approximately twice the peak value of the AC voltage of the AC power supply 1. It will be.

  Then, as shown in FIG. 4, each of the second capacitors 6a and 6b is charged with a voltage approximately twice the peak value of the AC voltage of the AC power source 1, and the two second capacitors 6a and 6b Since 6b is connected in series, a voltage approximately four times the peak value of the AC voltage of the AC power source 1 is output from both ends thereof.

  FIG. 5 is a voltage waveform diagram according to the first embodiment of the present invention. The first capacitors 4a and 4b are charged to approximately the peak value of the AC voltage of the AC power source 1, and the second capacitors 6a and 6b are charged to approximately twice the peak value of the AC voltage of the AC power source 1. Therefore, the output voltage is approximately four times the peak value of the AC voltage of the AC power supply 1. However, when the capacity of the load 7 to be connected is large, the output voltage may be 4 times or less than the AC voltage of the AC power supply 1 in some cases.

6 and 7 are other circuit diagram examples according to the first embodiment of the present invention.
Since the second capacitors 6a and 6b are charged with a voltage that is approximately twice the peak value of the AC voltage of the AC power supply 1, compared to the AC voltage of the AC power supply 1 and the charging voltage of the first capacitors 4a and 4b. The voltage becomes high. Therefore, as shown in FIGS. 1 to 4, if the backflow prevention means 5a and 5b are not present, the second capacitor 6a is directed to the first capacitor 4a or the first capacitor 4b to the second capacitor 6b. There is a risk of current flowing backward.

  Therefore, as shown in FIG. 6, by providing the diodes 8a and 8b as the backflow prevention means 5a and 5b, the backflow of current is prevented.

  However, when the diodes 8a and 8b are used, there is a concern about efficiency deterioration due to a voltage drop when a current flows forward in the diodes 8a and 8b. Therefore, as shown in FIG. 7, diode short-circuiting means 9a and 9b for short-circuiting the diodes 8a and 8b are provided. The controller 51 controls the diode shorting means 9a and 9b to short-circuit the diodes 8a and 8b, so that current flows through the diode shorting means 9a and 9b instead of the diodes 8a and 8b. Efficiency degradation due to is prevented. Here, the control unit 51 is, for example, an arithmetic device such as a microcomputer.

  However, as described above, since the second capacitors 6a and 6b are charged with a voltage larger than the AC voltage of the AC power supply 1 and the charging voltage of the first capacitors 4a and 4b, there is a concern about the backflow of current. . Therefore, the control unit 51 closes the short-circuiting of the diode short-circuiting means 9a and 9b other than the timing when the current flows in the forward direction through the diodes 8a and 8b, that is, the timing when the reverse voltage is applied to the diodes 8a and 8b. By short-circuiting the diodes 8a and 8b, current backflow is prevented by the diodes 8a and 8b, and efficiency deterioration due to voltage drop is prevented by current flowing through the diode short-circuit means 9a and 9b.

Here, the diode short-circuit means 9a and 9b are operated by the control unit 51 as follows, for example.
When both the first opening / closing means 10 (see FIG. 8 described later) and the second opening / closing means 11 (see FIG. 9 described later) or one of them is open, the second capacitors 6a and 6b are supplied with power. Since the same voltage as the voltage is charged, no backflow occurs. At this time, the control unit 51 closes the diode short-circuit means 9a and 9b and short-circuits the diodes 8a and 8b, thereby preventing a voltage drop due to current flowing through the diodes 8a and 8b. On the other hand, when both the first opening / closing means 10 and the second opening / closing means 11 are closed, there is a risk of backflow. At this time, the controller 51 opens the diode short-circuit means 9a and 9b, thereby preventing the backflow.
Further, in the case where the charging / discharging timing of the second capacitors 6a and 6b is known, no backflow occurs when the second capacitors 6a and 6b are charged. At this time, the control unit 51 closes the diode short-circuit means 9a and 9b and short-circuits the diodes 8a and 8b, thereby preventing a voltage drop in the same manner as described above. On the other hand, when the second capacitors 6a and 6b are discharged, there is a risk of backflow. At this time, the controller 51 opens the diode short-circuit means 9a and 9b, thereby preventing the backflow.

  With the above configuration, a DC voltage up to about four times the peak value of the AC voltage of the AC power supply can be output. Further, for example, when an inverter that drives an electric motor is connected to the DC power supply device according to Embodiment 1, it is possible to use an electric motor having a high induced voltage, and it is possible to drive to a high speed range. Further, the current flowing through the electric motor and the inverter can be reduced, and high efficiency and energy saving can be achieved.

Needless to say, there is no problem even if a mechanical switch, a semiconductor switching element, or a bidirectional switch is used as the diode short-circuiting means 9a and 9b. The same applies to other embodiments. In addition, since the second capacitors 6a and 6b are charged with a voltage approximately twice the peak value of the AC voltage of the AC power supply 1, the voltage is higher than the charging voltage of the first capacitors 4a and 4b. Therefore, the breakdown of the capacitor can be prevented by selecting the appropriate one by setting the breakdown voltage of the second capacitors 6a and 6b higher than the breakdown voltage of the first capacitors 4a and 4b.
In FIG. 1, the reactor 2 is not only configured to be connected to the AC power source 1, but also exists in each closed circuit including the charging path to the capacitor in FIGS. 2 and 3. It is good also as a structure installed two or more.

Embodiment 2. FIG.
FIG. 8 is a circuit diagram of a DC power supply device according to the second embodiment. A first opening / closing means 10 is provided between the connection point of the two first capacitors 4 a and 4 b connected in series and one of the AC input terminals of the bridge rectifier circuit 3. A zero cross detecting means 81 for detecting the zero point of the AC voltage of the AC power source 1 is connected in parallel with the AC power source 1. The output side of the zero cross detection means 81 is connected to the control unit 51. An output voltage detection means 82 for detecting the output voltage is connected to both ends of two second capacitors 6a and 6b connected in series. The output side of the output voltage detection means 82 is connected to the control unit 51. The zero cross detection means 81 outputs the zero point signal detected as described above to the control unit 51. Further, the output voltage detection means 82 outputs the output voltage detected as described above to the control unit 51. Since the configuration other than the above configuration is the same as that of the first embodiment, differences from the first embodiment will be mainly described. Further, the operation of the zero cross detection means 81 will be described later in the fourth embodiment.

  When the first opening / closing means 10 is closed by the control unit 51, the circuit configuration is the same as that in the first embodiment, and a voltage approximately four times the peak value of the AC voltage of the AC power supply 1 is output. . Further, when the first opening / closing means 10 is opened by the control unit 51, a voltage doubler rectifier circuit is formed, and a voltage that is approximately twice the peak value of the AC voltage of the AC power supply 1 is output.

  Further, the controller 51 repeats the opening / closing operation of the first opening / closing means 10, so that a voltage between approximately twice and four times the peak value of the AC voltage of the AC power supply 1 can be output.

  In addition, for example, the output voltage detection unit 82 detects the output voltage, and the control unit 51 receives the output voltage from the output voltage detection unit 82 so that the output voltage becomes a desired value. It is possible to output an optimum voltage to the load 7 by operating the.

  Further, the control unit 51 causes the first opening / closing means 10 to open and close at a frequency earlier than the frequency of the AC power supply 1 by, for example, PWM (Pulse Width Modulation) control, so that the peak of the AC voltage of the AC power supply 1 is reached. Not only can it output a voltage that is approximately twice to four times the value, but it can also make the input current substantially sinusoidal and operate in a high power factor state, thus increasing the effective power. . Details of the PWM control operation will be described later in a fourth embodiment. In general, since the input is limited by the breaker capacity, the input power to the load connected to the DC power supply device can be increased by the increased effective power, and the output of the load can be increased. Moreover, since the active power increases, the reactive power decreases, the power receiving capacity in the distribution facility can be reduced, and it is possible to contribute to the effective use of the energy generated at the power plant. Further, since the harmonic component is reduced by making the input current substantially sinusoidal, it can be adapted to the power supply harmonic standards defined by JIS and IEC.

  Further, the control unit 51 controls the first opening / closing means 10 so that the backflow of the current from the second capacitors 6a and 6b does not occur, so that the backflow prevention means 5a and 5b can be omitted. It is possible to provide a low-cost DC power supply device.

  Needless to say, there is no problem even if a mechanical switch, a semiconductor switching element, or a bidirectional switch is used as the first switching means 10.

Embodiment 3 FIG.
FIG. 9 is a circuit diagram of a DC power supply device according to the third embodiment. A second opening / closing means 11 is provided between a connection point between the two second capacitors 6 a and 6 b connected in series and one of the AC input terminals of the bridge rectifier circuit 3. A zero cross detecting means 81 for detecting the zero point of the AC voltage of the AC power source 1 is connected in parallel with the AC power source 1. The output side of the zero cross detection means 81 is connected to the control unit 51. An output voltage detection means 82 for detecting the output voltage is connected to both ends of two second capacitors 6a and 6b connected in series. The output side of the output voltage detection means 82 is connected to the control unit 51. The zero cross detection means 81 outputs the zero point signal detected as described above to the control unit 51. Further, the output voltage detection means 82 outputs the output voltage detected as described above to the control unit 51. Since the configuration other than the above configuration is the same as that of the first embodiment, differences from the first embodiment will be mainly described. Further, the operation of the zero cross detection means 81 will be described later in the fourth embodiment.

  When the second opening / closing means 11 is closed by the control unit 51, the circuit configuration is the same as in the first embodiment, and a voltage approximately four times the peak value of the AC voltage of the AC power source 1 is output. . Further, when the second opening / closing means 11 is opened by the control unit 51, a voltage doubler rectifier circuit is formed, and a voltage that is approximately twice the peak value of the AC voltage of the AC power supply 1 is output.

  Further, the control unit 51 repeats the opening / closing operation of the second opening / closing means 11, so that a voltage between approximately twice and four times the peak value of the AC voltage of the AC power supply 1 can be output.

  In addition, for example, the output voltage detection unit 82 detects the output voltage, and the control unit 51 receives the output voltage from the output voltage detection unit 82 so that the output voltage becomes a desired value. It is possible to output an optimum voltage to the load 7 by operating the.

  Further, the controller 51 causes the second opening / closing means 11 to open and close at a frequency faster than the frequency of the AC power supply 1 by, for example, PWM (Pulse Width Modulation) control. Not only can it output a voltage that is approximately twice to four times the value, but it can also make the input current substantially sinusoidal and operate in a high power factor state, thus increasing the effective power. . Details of the PWM control operation will be described later in a fourth embodiment. In general, since the input is limited by the breaker capacity, the input power to the load connected to the DC power supply device can be increased by the increased effective power, and the output of the load can be increased. Moreover, since the active power increases, the reactive power decreases, and the power receiving capacity in the power distribution facility can be reduced, thereby contributing to the effective use of energy generated at the power plant. Further, since the harmonic component is reduced by making the input current substantially sinusoidal, it can be adapted to the power supply harmonic standards defined by JIS and IEC.

  Further, the control unit 51 controls the second opening / closing means 11 so that no backflow of current from the second capacitors 6a and 6b occurs, so that the backflow prevention means 5a and 5b can be omitted. It is possible to provide a low-cost DC power supply device.

  Needless to say, a mechanical switch may be used as the second switching means 11, and there is no problem even if a semiconductor switching element or a bidirectional switch is used.

Embodiment 4 FIG.
FIG. 10 is a circuit diagram of a DC power supply device according to the fourth embodiment. A first opening / closing means 10 is provided between a connection point between the two first capacitors 4a and 4b connected in series and one of the AC input terminals of the bridge rectifier circuit 3, and the two second switches connected in series are provided. A second opening / closing means 11 is provided between the connection point of the two capacitors 6 a and 6 b and the other of the AC input terminals of the bridge rectifier circuit 3. A zero cross detecting means 81 for detecting the zero point of the AC voltage of the AC power source 1 is connected in parallel with the AC power source 1. The output side of the zero cross detection means 81 is connected to the control unit 51. An output voltage detection means 82 for detecting the output voltage is connected to both ends of two second capacitors 6a and 6b connected in series. The output side of the output voltage detection means 82 is connected to the control unit 51. The zero cross detection means 81 outputs the zero point signal detected as described above to the control unit 51. Further, the output voltage detection means 82 outputs the output voltage detected as described above to the control unit 51. Since the configuration other than the above configuration is the same as that of the first embodiment, differences from the first embodiment will be mainly described.

  When the first opening / closing means 10 and the second opening / closing means 11 are closed by the control unit 51, the circuit configuration is the same as in the first embodiment, and the voltage is approximately four times the peak value of the AC voltage of the AC power supply 1. Will be output. Further, when the first opening / closing means 10 is opened by the control unit 51 and the second opening / closing means 11 is closed, or when the first opening / closing means 10 is closed and the second opening / closing means 11 is opened. Is a voltage doubler rectifier circuit, and is configured to output a voltage approximately twice the peak value of the AC voltage of the AC power supply 1. Further, when the first opening / closing means 10 and the second opening / closing means 11 are opened, a full-wave rectification circuit is formed, and a voltage substantially the same as the peak value of the AC voltage of the AC power supply 1 can be output.

  Further, the controller 51 repeats the opening / closing operation of the first opening / closing means 10 and the second opening / closing means 11, so that the voltage between about 1 to 4 times the peak value of the AC voltage of the AC power supply 1 is increased. Output is possible.

  In addition, for example, the output voltage detection unit 82 detects the output voltage, and the control unit 51 receives the output voltage from the output voltage detection unit 82 so that the output voltage becomes a desired value. Further, by operating the second opening / closing means 11, it is possible to output an optimum voltage to the load 7.

Further, for an operation example in which the control unit 51 opens / closes the first opening / closing means 10 and the second opening / closing means 11 at a frequency faster than the frequency of the AC power supply 1 by, for example, PWM (Pulse Width Modulation) control. This will be described with reference to FIGS. 11 and 12.

FIG. 11 is a control block diagram showing an operation example by PWM control of the DC power supply according to Embodiment 4, and FIG. 12 is a time chart showing a state of the operation example by the PWM control.
As shown in FIG. 11, the control unit 51 uses the output voltage command value for controlling the output voltage of the DC power supply device as Vdc *, and the DC power supply detected by the output voltage detection means 82 shown in FIG. Let the output voltage of the device be Vdc. In FIG. 11, an adder 51a calculates a deviation ΔVdc between Vdc * and Vdc, and outputs this deviation ΔVdc to the PI controller 51c. The PI controller 51c that has received the deviation ΔVdc obtains the amplitude A of the modulation signal by PI control. The modulation signal calculation unit 51 d that has received the amplitude A multiplies the amplitude A by sin (θ + φ) to obtain a modulation signal Sa for driving the first opening / closing means 10. Here, θ is a voltage phase of the AC power supply 1 and φ is a phase determined arbitrarily. Further, the adder 51b obtains the modulation signal Sb for driving the second opening / closing means 11 as 1 minus Sa. As shown in FIG. 12, the modulation signals Sa and Sb are compared with a triangular carrier signal, and drive signals for the first opening / closing means 10 and the second opening / closing means 11 are generated. Here, the drive signal for the first opening / closing means 10 is generated as 0 (Low) when the carrier signal is smaller than the modulation signal Sa, and 1 (High) when it is larger. The drive signal for the second opening / closing means 11 is generated as 1 (High) when the carrier signal is smaller than the modulation signal Sb, and 0 (Low) when it is larger.

  With the PWM control as described above, it is possible not only to output a voltage approximately 1 to 4 times the peak value of the AC voltage of the AC power supply 1, but also to make the input current substantially sinusoidal. Thus, the active power increases because it operates in a high power factor state. In general, since the input is limited by the breaker capacity, the input power to the load connected to the DC power supply device can be increased by the increased effective power, and the output of the load can be increased. Moreover, since the active power increases, the reactive power decreases, and the power receiving capacity in the power distribution facility can be reduced, thereby contributing to the effective use of energy generated at the power plant. Further, since the harmonic component is reduced by making the input current substantially sinusoidal, it can be adapted to the power supply harmonic standards defined by JIS and IEC.

  Further, the control unit 51 controls the first opening / closing means 10 and the second opening / closing means 11 so that no backflow of the current from the second capacitors 6a and 6b occurs, whereby the backflow prevention means 5a. And 5b can be omitted, and a low-cost DC power supply device can be provided.

Needless to say, a mechanical switch, a semiconductor switching element, or a bidirectional switch may be used as the first opening / closing means 10 and the second opening / closing means 11.
Further, in the modulation signals Sa and Sb, the modulation signal Sb is used for driving the first opening / closing means 10 and the modulation signal Sa is used for driving the second opening / closing means 11. PWM control is possible.
In the above-described PWM control, the DC power supply device including only the first opening / closing means 10 according to the second embodiment performs PWM for the first opening / closing means 10 only by the drive signal obtained from the modulation signal Sa. Control is possible. And also about the DC power supply device provided only with the 2nd opening-and-closing means 11 based on Embodiment 3, PWM control is possible with respect to the 2nd opening-and-closing means 11 only with the drive signal obtained by the modulation signal Sa. .
Then, as shown in FIG. 13, for the first switching means 10 from the zero point of the AC voltage of the AC power supply 1, for the second switching means 11 for the time Ton1 from the place delayed by the time Tdelay1. The operation similar to that described above can be obtained even when the operation is driven by the control unit 51 from the time delayed by the time of Tdelay2 to the time of Ton2. FIG. 13 shows the operation of driving the first opening / closing means 10 and the second opening / closing means 11 only once from the zero point to the next zero point. The operation may be driven. For the DC power supply device including only the first opening / closing means 10 according to the second embodiment, the above-described control can be performed on the first opening / closing means 10. The above-described control can be performed on the second opening / closing means 11 with respect to the DC power supply apparatus including only the second opening / closing means 11 according to the third embodiment.

Embodiment 5 FIG.
FIG. 14 is a connection diagram of an inverter according to the fifth embodiment. The inverter 52 is connected as a load to the output side of the DC power supply according to the fourth embodiment, and is also connected to the output side of the control unit 51. An electric motor 53 is connected to the output side of the inverter 52. The inverter device 101 includes a DC power supply device that is supplied with power from the AC power supply 1 according to the fourth embodiment, and an inverter 52. In FIG. 14, the DC power supply device configuring the inverter device 101 is shown according to the fourth embodiment, but may be the DC power supply device according to the first, second, or third embodiment. The DC voltage output from the DC power supply device according to Embodiment 5 is supplied to inverter 52. The inverter 52 supplied with the DC voltage supplies a drive current to the electric motor 53 in accordance with a control signal output from the control unit 51 and rotates it.

With the above configuration, the electric motor 53 having a high induced voltage can be driven, so that the electric motor can be driven with a small current, and high efficiency can be achieved by reducing the loss of the electric motor 53 and the inverter 52. And since it becomes possible to obtain a high output voltage, it becomes possible to rotate an electric motor to a high-speed range, and it also becomes possible to improve performance.
Below, the example of application of the inverter apparatus 101 with respect to another apparatus is shown.

  FIG. 15 is a connection diagram between the inverter according to Embodiment 5 and the compressor of the air conditioner. An electric motor 53 is connected to the output side of the inverter device 101, and the electric motor 53 is coupled to the compression element 54. The compressor 55 includes an electric motor 53 and a compression element 54. The refrigeration cycle unit 56 is configured to include a four-way valve 56a, an indoor heat exchanger 56b, an expansion valve 56c, and an outdoor heat exchanger 56d. The flow path of the refrigerant circulating inside the air conditioner passes from the compression element 54 through the four-way valve 56a, the indoor heat exchanger 56b, the expansion valve 56c, the outdoor heat exchanger 56d, and again through the four-way valve 56a. , In a manner returning to the compression element 54. Inverter device 101 receives supply of AC voltage from AC power supply 1 and rotates electric motor 53. The compression element 54 performs the compression operation of the refrigerant as the electric motor 53 rotates, and circulates the refrigerant in the refrigeration cycle unit 56.

  With the above configuration, the air conditioner shown in FIG. 15 can reduce power consumption under conditions of low speed rotation and low load that are frequently used throughout the year. In addition, power consumption can be reduced under the conditions of high speed rotation and high load, and cooling and heating capabilities can be improved, and an energy-saving and high-performance air conditioner can be obtained.

  FIG. 16 is a connection diagram of the inverter and the electric motor for driving the washing machine. The water tub 57 is installed in the washing machine 102, and the washing tub 58 is rotatably installed therein. A stirring blade 59 is rotatably installed at the bottom of the washing tub 58. The rotating shaft of the electric motor 53 installed at the bottom of the water tank 57 is connected to the water tank 57 and the stirring blade 59. Although not shown, the inverter device 101 is connected to the electric motor 53 and mounted inside the washing machine 102. When the inverter device 101 controls the rotation of the electric motor 53, the washing tub 58 and the stirring blade 59 rotate, and the washing operation is performed.

  FIG. 17 is a connection diagram of the inverter and the electric motor for driving the washing / drying machine. The water tank 60 is installed in the washing / drying machine 103, and the rotating drum 61 is rotatably installed therein. The rotating shaft of the electric motor 53 installed at the bottom of the water tank 60 is connected to the rotating drum 61. Although not shown, the inverter device 101 is connected to the electric motor 53 and mounted inside the washing / drying machine 103. When the inverter device 101 controls the rotation of the electric motor 53, the rotary drum 61 rotates, and washing and drying operations are performed.

  With the above configuration, the washing machine and the washing and drying machine shown in FIGS. 16 and 17 can save energy under conditions of low speed rotation and high load such as washing and drying operation. Further, even when the electric motor is rotated at a high speed as in the dehydration operation, a large output voltage can be obtained, so that it is possible to further increase the rotation speed and increase the dewatering capacity. Therefore, by reducing the dehydration time, it is possible to obtain a washing machine and a washing / drying machine with high customer satisfaction. Furthermore, an energy-saving washing and drying machine can be obtained by shortening the operation time during the drying operation.

  As described above, the DC power supply device according to the present invention is suitably used for an inverter, and examples of the application include an inverter for a compressor and an inverter for a blower. Examples of compressor inverters that are installed include air conditioners, refrigerators, refrigerators, dehumidifiers, and water heaters. Examples of fans that are equipped with inverters for fans are ventilation fans, air purifiers, and humidifiers. Can be mentioned. Thus, the application range of the DC power supply device according to the present invention is wide and the industrial applicability is great.

It is a circuit diagram of the DC power supply device shown in the first embodiment of the present invention. It is a figure which shows operation | movement of Embodiment 1 of this invention. It is a figure which shows operation | movement of Embodiment 1 of this invention. It is a figure which shows operation | movement of Embodiment 1 of this invention. It is a voltage waveform diagram shown in Embodiment 1 of this invention. It is the other circuit diagram example shown in Embodiment 1 of this invention. It is the other circuit diagram example shown in Embodiment 1 of this invention. It is a circuit diagram of the DC power supply device shown in Embodiment 2 of the present invention. It is a circuit diagram of the DC power supply device shown in Embodiment 3 of the present invention. It is a DC power supply circuit diagram shown in Embodiment 4 of the present invention. It is a control block diagram which shows the operation example by PWM control of the DC power supply device shown in Embodiment 4 of this invention. It is a time chart which shows the state of the operation example by PWM control of the DC power supply device shown in Embodiment 4 of this invention. It is a time chart which shows the state of the operation example by the other control of the DC power supply device shown in Embodiment 4 of this invention. It is a connection diagram of the inverter shown in Embodiment 5 of this invention. It is a connection diagram of the inverter shown in Embodiment 5 of this invention and the compressor of an air conditioner. It is a connection diagram of the inverter shown in Embodiment 5 of this invention, and the electric motor for a drive of a washing machine. It is a connection diagram of the inverter shown in Embodiment 5 of the present invention and the electric motor for driving the washing and drying machine.

Explanation of symbols

  1 AC power source, 2 reactor, 3 bridge rectifier circuit, 3a, 3b, 3c, 3d rectifier diode, 4a, 4b first capacitor, 5a, 5b backflow prevention means, 6a, 6b second capacitor, 7 load, 8a , 8b Diode, 9a, 9b Diode short-circuiting means, 10 First switching means, 11 Second switching means, 51 Control section, 51a, 51b Adder, 51c PI controller, 51d Modulation signal calculation section, 52 Inverter, 53 Electric motor, 54 compression element, 55 compressor, 56 refrigeration cycle section, 56a four-way valve, 56b indoor heat exchanger, 56c expansion valve, 56d outdoor heat exchanger, 57, 60 water tank, 58 washing tub, 59 stirring blade, 61 rotations Drum, 81 Zero cross detection means, 82 Output voltage detection means, 101 Inverter device, 102 Washing machine, 1 3 washing and drying machine.

Claims (28)

A rectifier circuit for full-wave rectification of an AC power supply via a reactor;
Two first capacitors connected in series connected in parallel to the output of the rectifier circuit;
Two second capacitors connected in series connected in parallel via two backflow blocking means connected across the two first capacitors connected in series;
With
A connection point between the two first capacitors connected in series and one of the AC input terminals of the rectifier circuit are connected,
The connection point of the two second capacitors connected in series and the other of the AC input terminals of the rectifier circuit are connected,
A DC power supply apparatus, characterized in that a voltage approximately four times the peak value of the AC voltage of the AC power supply is output to a load connected in parallel across the two second capacitors connected in series. A rectifier circuit for full-wave rectification of an AC power supply via a reactor;
Two first capacitors connected in series connected in parallel to the output of the rectifier circuit;
Two second capacitors connected in series connected in parallel via two backflow blocking means connected across the two first capacitors connected in series;
First opening / closing means provided between a connection point of the two first capacitors connected in series and one of the AC input terminals of the rectifier circuit;
Control means for controlling the opening / closing operation of the first opening / closing means;
With
The connection point of the two second capacitors connected in series and the other of the AC input terminals of the rectifier circuit are connected,
When the first opening / closing means is operated by the control means, a voltage between about twice and about four times the peak value of the AC voltage of the AC power supply is applied to the two second connected in series. Output to a load connected in parallel across the capacitor. A rectifier circuit for full-wave rectification of an AC power supply via a reactor;
Two first capacitors connected in series connected in parallel to the output of the rectifier circuit;
Two second capacitors connected in series connected in parallel via two backflow blocking means connected across the two first capacitors connected in series;
A second opening / closing means provided between a connection point of the two second capacitors connected in series and one of the AC input terminals of the rectifier circuit;
Control means for controlling the opening and closing operation of the second opening and closing means;
With
A connection point between the two first capacitors connected in series and the other of the AC input terminals of the rectifier circuit are connected;
When the second opening / closing means is operated by the control means, a voltage between about 2 times and about 4 times the peak value of the AC voltage of the AC power supply is applied to the two second connected in series. Output to a load connected in parallel across the capacitor. A rectifier circuit for full-wave rectification of an AC power supply via a reactor;
Two first capacitors connected in series connected in parallel to the output of the rectifier circuit;
Two second capacitors connected in series connected in parallel via two backflow blocking means connected across the two first capacitors connected in series;
First opening / closing means provided between a connection point of the two first capacitors connected in series and one of the AC input terminals of the rectifier circuit;
A second opening / closing means provided between a connection point of the two second capacitors connected in series and the other of the AC input terminals of the rectifier circuit;
Control means for controlling the opening and closing operations of the first and second opening and closing means;
With
By operating the first and second opening / closing means by the control means, a voltage between about four times the peak value of the AC voltage of the AC power supply is supplied to the two second connected in series. Output to a load connected in parallel across the capacitor. The DC power supply device according to any one of claims 1 to 4, wherein the backflow prevention means is a diode. 6. The DC power supply device according to claim 5, further comprising diode short-circuit means connected in parallel to the diode. The DC power supply device according to claim 6, wherein the control unit short-circuits the diode by the diode short-circuit unit except for a timing at which a reverse voltage is applied to the diode. The DC power supply device according to claim 6 or 7, wherein the diode short-circuiting means is a switching element made of a semiconductor. The DC power supply device according to claim 6 or 7, wherein the diode short-circuiting means is a mechanical switch. The DC power supply device according to claim 6 or 7, wherein the diode short-circuiting means is a bidirectional switch. A rectifier circuit for full-wave rectification of an AC power supply via a reactor;
Two first capacitors connected in series connected in parallel to the output of the rectifier circuit;
Two second capacitors connected in series connected in parallel across the two first capacitors connected in series;
First opening / closing means provided between a connection point of the two first capacitors connected in series and one of the AC input terminals of the rectifier circuit;
Control means for controlling the opening / closing operation of the first opening / closing means;
With
The connection point of the two second capacitors connected in series and the other of the AC input terminals of the rectifier circuit are connected,
When the first opening / closing means is operated by the control means, a voltage between about twice and about four times the peak value of the AC voltage of the AC power supply is applied to the two second connected in series. Output to a load connected in parallel across the capacitor. A rectifier circuit for full-wave rectification of an AC power supply via a reactor;
Two first capacitors connected in series connected in parallel to the output of the rectifier circuit;
Two second capacitors connected in series connected in parallel across the two first capacitors connected in series;
A second opening / closing means provided between a connection point of the two second capacitors connected in series and one of the AC input terminals of the rectifier circuit;
Control means for controlling the opening and closing operation of the second opening and closing means;
With
A connection point between the two first capacitors connected in series and the other of the AC input terminals of the rectifier circuit are connected;
When the second opening / closing means is operated by the control means, a voltage between about 2 times and about 4 times the peak value of the AC voltage of the AC power supply is applied to the two second connected in series. Output to a load connected in parallel across the capacitor. A rectifier circuit for full-wave rectification of an AC power supply via a reactor;
Two first capacitors connected in series connected in parallel to the output of the rectifier circuit;
Two second capacitors connected in series connected in parallel across the two first capacitors connected in series;
First opening / closing means provided between a connection point of the two first capacitors connected in series and one of the AC input terminals of the rectifier circuit;
A second opening / closing means provided between a connection point of the two second capacitors connected in series and the other of the AC input terminals of the rectifier circuit;
Control means for controlling the opening and closing operations of the first and second opening and closing means;
With
By operating the first and second opening / closing means by the control means, a voltage between about four times the peak value of the AC voltage of the AC power supply is supplied to the two second connected in series. Output to a load connected in parallel across the capacitor. The DC power supply device according to any one of claims 2 to 4, and 11 to 13, wherein the opening / closing means is a switching element made of a semiconductor. The DC power supply device according to any one of claims 2 to 4, and 11 to 13, wherein the opening / closing means is a mechanical switch. The DC power supply device according to any one of claims 2 to 4, and 11 to 13, wherein the opening / closing means is a bidirectional switch. The DC power supply device according to any one of claims 1 to 16, wherein the second capacitor has a higher withstand voltage than the first capacitor. The DC power supply apparatus according to claim 2, 4, 11, or 13, wherein the control means opens and closes the first opening / closing means at a frequency higher than the frequency of the AC power supply. . The DC power supply device according to claim 3, 4, 12, or 13, wherein the control means opens and closes the second opening / closing means at a frequency higher than the frequency of the AC power supply. . Zero-cross detection means for detecting a zero point of the AC voltage of the AC power supply;
Output voltage detecting means for detecting an output voltage of the DC power supply device;
With
The control means opens and closes the first opening / closing means by PWM control based on the zero-cross detection signal detected by the zero-cross detection means and the output voltage detected by the output voltage detection means. The DC power supply device according to claim 18. Zero-cross detection means for detecting a zero point of the AC voltage of the AC power supply;
Output voltage detecting means for detecting an output voltage of the DC power supply device;
With
The control means opens and closes the second opening / closing means by PWM control based on the zero-cross detection signal detected by the zero-cross detection means and the output voltage detected by the output voltage detection means. The DC power supply device according to claim 19. Comprising zero-cross detection means for detecting a zero point of the AC voltage of the AC power source;
The control means opens or closes the first opening / closing means one or more times between a zero point detected by the zero-cross detection means and a next detected zero point. The DC power supply device according to claim 2, claim 4, claim 11 or claim 13. Comprising zero-cross detection means for detecting a zero point of the AC voltage of the AC power source;
The control means opens or closes the second opening / closing means one or more times between a zero point detected by the zero-cross detection means and a next detected zero point. The DC power supply device according to claim 3, claim 4, claim 12 or claim 13. The DC power supply device according to any one of claims 1 to 23, wherein a reactor is provided for each charging path to each of the capacitors instead of the reactor connected to the AC power supply.   The inverter apparatus carrying the DC power supply device in any one of Claims 1-24.   An air conditioner equipped with the inverter device according to claim 25.   A washing machine equipped with the inverter device according to claim 25.   A washer-dryer equipped with the inverter device according to claim 25.

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