JP2009207328A - Power device - Google Patents

Abstract

A power supply device having a power assist function using EDLC is reduced in cost.
A power supply apparatus according to the present invention is a hybrid power supply apparatus including a main power supply (110) and an auxiliary power supply using an EDLC module (140), and includes a first mode (S1) and a second mode (S2). ), And in the first mode (S1), the main power source (110) and the EDLC module (140) are connected in series to discharge the EDLC module (140) to load ( 160) increases the supply voltage (V _iN) to, when said second mode (S2), the said EDLC module (140) with respect to said main power supply (110) a first mode (S1) Is connected in series with a reverse polarity to lower the supply voltage (V _IN ) to the load (160) and charge the EDLC module (140).
[Selection] Figure 1

Description

  The present invention relates to a hybrid power supply apparatus having a main power supply and an auxiliary power supply using an electric double layer capacitor (EDLC) module.

  In recent years, general-purpose inverters for driving motors at variable speeds have greatly improved energy saving and controllability, and are used in large quantities in a wide range of applications.

  In general-purpose inverters that use commercial power as a power source, the power line is converted to direct current (DC link) by AC-to-DC conversion, and this is switched by a semiconductor element such as IGBT to generate a PWM waveform, and the motor that becomes the load is Sine wave drive. In this case, the input voltage (VIN) of the inverter is defined by the power supply voltage (VE) of the commercial power supply. For example, when the commercial power supply is 200V AC, VIN is 280V DC.

  The maximum input current of the inverter is determined by the specifications of the motor that is the load, the power receiving capacity of the commercial power supply, and the specifications of the power device that constitutes the inverter, but the maximum power supply is always specified by the power receiving capacity (allowable current) of the commercial power supply. Therefore, in most cases, the maximum output of the inverter is also contracted by the receiving capacity of the commercial power supply.

  The inverter performs variable speed operation or voltage control in order to supply the load with electric power commensurate with the load. However, since the maximum output is defined by the power receiving capacity, in general, power exceeding the power receiving capacity is supplied to the load. I can't. For example, in the case of an inverter air conditioner, the controllability and energy saving performance in light load operation have been greatly improved by the inverter, but even if you want to drive the sub-heater or compressor (over the rating) to speed up the startup, These power assist operations have been impossible in the past due to the limited power receiving capacity.

  In recent years, the performance of energy storage devices (energy density and output density) has been improved and the price has been reduced. Energy storage devices can be broadly divided into energy-type secondary batteries and power-type capacitors (electric double-layer capacitors: EDLC), which are being put to practical use in applications that take advantage of their respective characteristics.

  Secondary batteries have a higher energy density than EDLC and are suitable for use as an energy source in the absence of commercial power, but fine charge / discharge control is essential for stable operation over a long period of time. The burden of hardware and software is very large.

  On the other hand, EDLC can extract a large output in a short time, but has a problem that it is difficult to use as an electric power source such as an inverter because the energy density is small and the voltage fluctuates with respect to the charged amount.

As an example of practical application of power assist using an electricity storage device, there is application to a copying machine (see Patent Document 1). The upper limit of the input power to the heater for heating the fixing drum was regulated by the limit of the power receiving capacity, but a large amount of power can be input to the heater with the power assist from EDLC, and the start-up is realized for a short time. In addition, EDLC, not a secondary battery, has been adopted as an electricity storage device because it requires a large output discharge in a short time and extends its life. When the load is a resistive load such as a heater, it is not necessary to drive the load with an inverter, so even if EDLC is used, it can be realized with a relatively simple circuit and control.
JP 2000-315567 A JP 2003-143713 A

A power assist function such as the above-described copying machine can be applied to a power conversion device such as a general-purpose inverter or an air conditioning inverter using an electricity storage device. A system block diagram of a power converter with power assist by EDLC is shown in FIG. In order to power assist the inverter (160), it is most preferable to increase the input voltage (V _IN ) of the inverter (160). In the power converter (200) shown in FIG. 6, the node (N20) and the node (N21) are connected by the changeover switch (220), so that the EDLC series connection module (140) (voltage V _C ) is commercial power supply. It will be connected in series with the voltage source (V _E ) from (10). As a result, V _IN = V _E + V _C , and the input voltage (V _IN ) of the inverter (160) can be increased by the voltage (V _C ) of the EDLC module (140), thereby power assisting the load. be able to.

  However, once the energy storage device has been discharged and used up the stored energy, it cannot perform the next power assist unless it is charged in some form. In FIG. 6, the charging circuit (210) of the EDLC module (140) is illustrated as a block. However, in order to specifically configure the charging circuit (210), it is necessary to convert the commercial power source (10) from AC to DC. Furthermore, since a voltage source and a charge control circuit suitable for the charging conditions of the EDLC module (140) are required, the hardware for charging becomes large-scale, and the device size and cost are greatly increased. .

A power supply device according to the present invention is a hybrid power supply device including a main power supply (110) and an auxiliary power supply using an electric double layer capacitor (EDLC) module (140), and is a first mode (S1). And the second mode (S2), and in the first mode (S1), the main power source (110) and the EDLC module (140) are connected in series to form the EDLC module (140). To increase the supply voltage (V _IN ) to the load (160), and in the second mode (S2), the EDLC module (140) is connected to the main power source (110). The first mode (S1) is connected in series with a reverse polarity to lower the supply voltage (V _IN ) to the load (160) and charge the EDLC module (140).

The main power source (110) supplies a voltage (V _E ) between the first node (N1) and the second node (N2), and the EDLC module (140) (N3a, N3b) and the fourth node (N4a, N4b), and the power supply device further includes switching means (130, 150), and the switching means (130, 150) is configured in the first mode ( S1), connecting the second node (N2) and the third node (N3a) and connecting the fourth node (N4b) and the fifth node (N5), In the second mode (S2), the second node (N2) and the fourth node (N4a) are connected, and the third node (N3b) and the fifth node (N5) are connected. The power supply device is connected, and the voltage (V _IN ) between the first node (N1) and the fifth node (N5) is supplied to the load.

Further, when the load (160) is in a light load state and the supply voltage (V _IN ) to the load (160) can be lowered, the mode shifts to the second mode (S2).

The power supply apparatus further includes a third mode (S3). In the third mode (S3), the EDLC module (140) is not inserted into the voltage supply path to the load (160). The voltage (V _IN ) is supplied to the load (160) only by the main power source (110, 120).

  The power supply device further includes a third mode (S3), and the switching means (130, 150) is connected to the third node (N3a, N3b) and the third mode (S3) in the third mode (S3). The second node (N2) and the fifth node (N5) are connected via one of the four nodes (N4a, N4b), or the third node (N3a, N3b) The second node (N2) and the fifth node (N5) are connected without passing through any of the fourth nodes (N4a, N4b).

  The load (160) is an inverter.

A power converter (100) according to the present invention includes a converter (110) that converts an AC voltage into a DC voltage (V _E ) and outputs it, an electric double layer capacitor (EDLC) module (140), An inverter (160) that converts an input DC voltage into an AC voltage and outputs the voltage, and a voltage supply means (130, 150) that supplies a DC voltage (V _IN ) to the input of the inverter (160). In the first mode (S1), the means (130, 150) connects the output of the converter (110) and the EDLC module (140) in series and discharges the EDLC module (140) to discharge the inverter. When the supply voltage (V _IN ) to (160) is increased and in the second mode (S2), the EDLC module (140) is connected to the output of the converter (110) in the first mode (S1). under the connected in series with opposite polarity supply voltage to the inverter ₍₁₆₀₎ (V _iN) and Rutotomoni charging the EDLC module (140), characterized in that.

The converter (110) supplies the DC voltage (V _E ) between the first node (N1) and the second node (N2), and the EDLC module (140) Provided between the node (N3a, N3b) and the fourth node (N4a, N4b), and the voltage supply means (130, 150) is configured to be connected to the second node (N2) in the first mode (S1). ) And the third node (N3a) and the fourth node (N4b) and the fifth node (N5) are connected, and the second mode (S2) The second node (N2) and the fourth node (N4a), the third node (N3b) and the fifth node (N5), and the first node (N1) A voltage (V _IN ) between the fifth node (N5) and the fifth node (N5) is supplied to the inverter (160).

Further, when the inverter (160) is in a light load state and the input voltage (V _IN ) to the inverter (160) can be lowered, the mode shifts to the second mode (S2).

In the third mode (S3), the voltage supply means (130, 150) does not insert the EDLC module (140) into the voltage supply path to the inverter (160), but only by the converter (110). A voltage (V _IN ) is supplied to the inverter (160).

  The voltage supply means (130, 150) is configured to pass through either the third node (N3a, N3b) or the fourth node (N4a, N4b) in the third mode (S3). The second node (N2) and the fifth node (N5) are connected, or neither the third node (N3a, N3b) nor the fourth node (N4a, N4b) is interposed The second node (N2) and the fifth node (N5) are connected to each other.

  The inverter (160) supplies the AC voltage to a motor (20) for driving a compressor provided in a refrigerant circuit of the air conditioner.

  An air conditioner according to the present invention includes the power conversion device (100) described above.

In the present invention, in the first mode (S1), the main power supply (110) and the EDLC module (140) are connected in series, and the EDLC module (140) is discharged to supply voltage to the load (160). Increase (V _IN ) to perform power assist. On the other hand, in the second mode (S2), the EDLC module (140) is connected to the main power supply (110) in series with the opposite polarity to the first mode (S1) and connected to the load (160). The supply voltage (V _IN ) is lowered and the EDLC module (140) is charged. Therefore, a dedicated charging circuit (210 in FIG. 6) for charging the EDLC module (140) is not necessary, and the cost can be greatly reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, substantially the same components are denoted by the same reference numerals. Further, the following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

  A configuration of a power conversion apparatus according to an embodiment of the present invention is shown in FIG. This power converter (100) rectifies an AC power source (10) such as a commercial power source by a converter circuit (110), converts the DC to AC by an inverter circuit (160), and supplies it to the motor (20) It is. This power conversion device (100) is mounted on, for example, an air conditioner. In this case, the motor (20) drives a compressor provided in the refrigerant circuit of the air conditioner.

  The power converter (100) includes a converter circuit (110), a smoothing capacitor (120), a changeover switch (130, 150), an EDLC module (140), an inverter circuit (160), and a mode control unit (170). And.

The converter circuit (110) converts the AC voltage from the AC power source (10) into a DC voltage (V _E ), and outputs it between the node (N1) and the node (N2). The smoothing capacitor (120) is provided between the node (N1) and the node (N2).

  The changeover switch (130) switches the connection destination of the node (N2) to the node (N3a) or the node (N4a) according to the mode signals (S1, S2, S3) from the mode control unit (170). The changeover switch (150) switches the connection destination of the node (N5) to the node (N3b) or the node (N4b) according to the mode signals (S1, S2, S3) from the mode control unit (170).

  The EDLC module (140) is a power storage module in which a plurality of EDLC cells are connected in series. One end of the EDLC module (140) is connected to the nodes (N4a, N4b), and the other end is connected to the nodes (N3a, N3b).

  The mode control unit (170) gives the mode signals (S1, S2, S3) to the changeover switches (130, 150). Here, the mode signal (S1) is a signal indicating the “power assist mode”. The mode signal (S2) is a signal indicating “charging mode”. The mode signal (S3) is a signal indicating “bypass mode”.

The inverter circuit (160) receives the voltage (V _IN ) between the node (N1) and the node (N5) as an input, converts this input voltage (V _IN ) into an alternating current, and supplies it to the motor (20).

  Next, the operation of the power conversion device (100) configured as described above will be described. Here, a case where the power conversion device (100) is mounted on an air conditioner will be described as an example.

When the sub-heater drive or the compressor high output operation (above rating) is performed in order to accelerate the start-up of the air conditioner, the power conversion device (100) is switched to the power assist mode. Hereinafter, a description will be given with reference to FIG. When the mode is switched to the power assist mode, the mode control unit (170) outputs a mode signal (S1) to the changeover switches (130, 150). Before outputting the mode signal (S1), the mode controller (170) determines whether the terminal voltage (V _C ) of the EDLC module (140) has reached a predetermined level (fully charged). The mode signal (S1) may be output only when it has been reached.

  In response to the mode signal (S1) from the mode control unit (170), the changeover switch (130) connects the node (N2) and the node (N3a). In response to the mode signal (S1) from the mode control unit (170), the changeover switch (150) connects the node (N5) and the node (N4b).

Thus, the input voltage (V _IN ) of the inverter circuit (160) becomes V _IN = V _E + V _C. Thus, the power assist is performed by increasing the input voltage (V _IN ) of the inverter circuit (160) by the terminal voltage (V _C ) of the EDLC module (140).

When the load on the inverter circuit (160) is light (when the output of the inverter circuit (160) is in a low output / low speed state), it is not necessary to apply the rated voltage to the inverter circuit (160), and the inverter circuit (160) Even if the input voltage (V _IN ) is lowered, the control is not hindered. In such a case, the power conversion device (100) switches to the charging mode. Hereinafter, a description will be given with reference to FIG. When the mode is switched to the charging mode, the mode control unit (170) outputs a mode signal (S2) to the changeover switches (130, 150).

  In response to the mode signal (S2) from the mode control unit (170), the changeover switch (130) connects the node (N2) and the node (N4a). In response to the mode signal (S2) from the mode controller (170), the changeover switch (150) connects the node (N5) and the node (N3b).

As a result, the input voltage (V _IN ) of the inverter circuit (160) becomes V _IN = V _E −V _C. Thus, the input voltage (V _IN ) of the inverter circuit (160) is lowered by the terminal voltage (V _C ) of the EDLC module (140) and the EDLC module (140) is charged. No special consideration is required for the charging current of the EDLC module (140), and it may be in accordance with the load current on the inverter circuit (160) side, so that there is no problem in controlling the inverter circuit (160).

  As described above, according to the present embodiment, a dedicated charging circuit (210 in FIG. 6) for charging the EDLC module (140) is not necessary, and the cost can be greatly reduced.

The state of charge of the EDLC module (140) can be accurately grasped by the terminal voltage (V _C ) of the EDLC module (140). The mode control unit (170) detects the completion of charging with reference to the terminal voltage (V _C ) of the EDLC module (140). After the charging is completed, the power conversion device (100) switches to the bypass mode and causes the EDLC module (140) to wait for the next power assist. Hereinafter, a description will be given with reference to FIG.

  When the completion of charging of the EDLC module (140) is detected, the mode control unit (170) outputs a mode signal (S3) to the changeover switches (130, 150).

  In response to the mode signal (S3) from the mode control unit (170), the changeover switch (130) connects the node (N2) and the node (N3a). In response to the mode signal (S3) from the mode control unit (170), the changeover switch (150) connects the node (N5) and the node (N3b).

Thereby, the EDLC module (140) is electrically disconnected from the voltage supply path to the inverter circuit (160), and the input voltage (V _IN ) of the inverter circuit (160) becomes V _IN = V _E.

  In response to the mode signal (S3) from the mode control unit (170), the node (N2) and the node (N4a) are connected, and the node (N5) and the node (N4b) are connected. The switches (130, 150) may be controlled.

  Further, as shown in FIG. 5, in response to the mode signal (S3) from the mode control unit (170), the node (N2) and the node (N6) are connected, and the node (N5) and the node (N7) are connected. May be controlled so that both ends of the EDLC module (140) are electrically disconnected from the voltage supply path to the inverter circuit (160).

  As described above, according to the present invention, since a dedicated charging circuit (210 in FIG. 6) for charging the EDLC module (140) is not required, a power assist function using the EDLC module (140) can be realized by using a general-purpose inverter, It can be applied to a power conversion device such as an air conditioning inverter at a low cost.

It is a figure which shows the whole structure of the power converter device by embodiment of this invention. It is a figure for demonstrating the operation | movement at the time of the power assist mode of the power converter device shown in FIG. It is a figure for demonstrating the operation | movement at the time of the charge mode of the power converter device shown in FIG. It is a figure for demonstrating the operation | movement at the time of the bypass mode of the power converter device shown in FIG. It is a figure for demonstrating the operation | movement at the time of the bypass mode of the power converter device shown in FIG. It is a figure which shows the structure of the conventional power converter device which has a power assist function using EDLC.

Explanation of symbols

10 ... AC power supply
20 ... Motor
100 ... Power converter
110 ... Converter circuit
120 ... Smoothing capacitor
130,150 ... changeover switch
140… EDLC module
160 ... Inverter circuit
170… Mode control unit

Claims (13)

A hybrid power supply device comprising a main power source (110) and an auxiliary power source by an electric double layer capacitor (EDLC) module (140),
Having a first mode (S1) and a second mode (S2);
In the first mode (S1),
By connecting the main power source (110) and the EDLC module (140) in series and discharging the EDLC module (140), the supply voltage (V _IN ) to the load (160) is increased,
In the second mode (S2),
The EDLC module 140 is connected to the main power source 110 in series with a polarity opposite to that of the first mode S1 to reduce the supply voltage (V _IN ) to the load 160. Charging the EDLC module (140);
A power supply device characterized by that. In claim 1,
The main power source (110) supplies a voltage (V _E ) between the first node (N1) and the second node (N2),
The EDLC module (140) is provided between a third node (N3a, N3b) and a fourth node (N4a, N4b),
The power supply device further includes switching means (130, 150),
The switching means (130, 150)
In the first mode (S1), the second node (N2) and the third node (N3a) are connected, and the fourth node (N4b) and the fifth node (N5) are connected. And connect
In the second mode (S2), the second node (N2) and the fourth node (N4a) are connected and the third node (N3b) and the fifth node (N5) Connect
The power supply device
Supplying a voltage (V _IN ) between the first node (N1) and the fifth node (N5) to the load;
A power supply device characterized by that. In claim 1 or 2,
When the load (160) is in a light load state and the supply voltage (V _IN ) to the load (160) can be lowered, the mode shifts to the second mode (S2).
A power supply device characterized by that. In claim 1,
The power supply device further has a third mode (S3),
In the third mode (S3),
Supplying the voltage (V _IN ) to the load (160) only by the main power source (110, 120) without inserting the EDLC module (140) into the voltage supply path to the load (160);
A power supply device characterized by that. In claim 2,
The power supply device further has a third mode (S3),
The switching means (130, 150)
In the third mode (S3),
Connecting the second node (N2) and the fifth node (N5) via one of the third node (N3a, N3b) and the fourth node (N4a, N4b); Alternatively, the second node (N2) and the fifth node (N5) are connected without passing through the third node (N3a, N3b) and the fourth node (N4a, N4b). ,
A power supply device characterized by that. In any one of Claims 1-6,
The load (160) is an inverter;
A power supply device characterized by that. A converter (110) for converting an alternating voltage into a direct voltage (V _E ) and outputting it;
Electric Double Layer Capacitor (EDLC) module (140),
An inverter (160) for converting an input DC voltage into an AC voltage and outputting it;
Voltage supply means (130, 150) for supplying a DC voltage (V _IN ) to the input of the inverter (160),
The voltage supply means (130, 150)
In the first mode (S1), the output of the converter (110) and the EDLC module (140) are connected in series to discharge the EDLC module (140), thereby supplying the inverter (160). Increase the voltage (V _IN )
In the second mode (S2), the inverter (160) is connected to the output of the converter (110) in series with the EDLC module (140) having a polarity opposite to that of the first mode (S1). Reducing the supply voltage (V _IN ) to the EDLC module (140),
The power converter characterized by the above-mentioned. In claim 7,
The converter (110) supplies the DC voltage (V _E ) between a first node (N1) and a second node (N2),
The EDLC module (140) is provided between a third node (N3a, N3b) and a fourth node (N4a, N4b),
The voltage supply means (130, 150)
In the first mode (S1), the second node (N2) and the third node (N3a) are connected, and the fourth node (N4b) and the fifth node (N5) are connected. And connect
In the second mode (S2), the second node (N2) and the fourth node (N4a) are connected and the third node (N3b) and the fifth node (N5) Connect
A voltage (V _IN ) between the first node (N1) and the fifth node (N5) is supplied to the inverter (160);
The power converter characterized by the above-mentioned. In claim 7 or 8,
When the inverter (160) is in a light load state and the input voltage (V _IN ) to the inverter (160) can be lowered, the mode shifts to the second mode (S2).
The power converter characterized by the above-mentioned. In claim 7,
The voltage supply means (130, 150)
In the third mode (S3), the voltage (V _IN ) is supplied to the inverter (160) only by the converter (110) without inserting the EDLC module (140) into the voltage supply path to the inverter (160). Supply,
The power converter characterized by the above-mentioned. In claim 8,
The voltage supply means (130, 150)
In the third mode (S3),
Connecting the second node (N2) and the fifth node (N5) via one of the third node (N3a, N3b) and the fourth node (N4a, N4b); Alternatively, the second node (N2) and the fifth node (N5) are connected without passing through the third node (N3a, N3b) and the fourth node (N4a, N4b). ,
The power converter characterized by the above-mentioned. In any one of Claims 7-11,
The inverter (160)
Supplying the AC voltage to a motor (20) for driving a compressor provided in a refrigerant circuit of the air conditioner,
The power converter characterized by the above-mentioned. A power converter (100) according to claim 12,
An air conditioner characterized by that.

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