JP2003339169A - Power unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inverter device or the like, without the need for manufacturing individual products, corresponding to characteristics and capacities thereof and which is easy in the manufacturing and maintenance of the products, and to provide the inverter device or the like which is variable in characteristics corresponding to the option of a user, after its purchase. <P>SOLUTION: A table selection means 20 reads out information Cd250 regarding the characteristics stored in an E<SP>2</SP>-PROM 12: a parameter table (one among 1 to 21), corresponding to the characteristics indicated by the information, is read out of a ROM 14; parameters Cd090, Cd260 and Cd265 regarding characteristics contained in the read-out parameter table are stored in a memory 15; and a CPU 11 drives an inverter 17 in accordance with a parameter, regarding the stored characteristics. Thus, by only rewriting information on the characteristics, one hardware can function as an inverter device or the like which has different characteristics, and the characteristics are changeable by the user. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an inverter device,
The present invention relates to a power supply device such as a stabilized DC power supply device, and more particularly to selection and modification of its characteristics and capacity.

[0002]

2. Description of the Related Art A power supply device, such as an inverter device, is classified as follows, for example, according to the characteristics of a load to be driven and the operating condition.

For low torque load drive: 150% of rated capacity overload for 1 minute ⇒ For driving conveyors, elevators, etc. Squared reduced torque load drive: 12 for rated capacity
0% 1 minute overload tolerance ⇒ For driving fan, pump, etc. Normally, when driving the same 7.5kW class electric motor,
If the load is a conveyor or the like, 7.5 kW of the low torque load driving inverter device is used, and if the load is a fan or the like, the squared reduction torque load driving inverter device of 7.5 kW is used.

Inverter device for driving low torque load and 2
In the inverter device for driving the load reduction torque load, even if the rated output is 7.5 kW, the characteristics, here, the overload withstand capacity, is 150% for 1 minute in the former and 120% in the latter.
Different from each minute. This greatly influences the selection of components to be used in the design of the inverter device. That is, even if the inverter device has the same rated capacity, the inverter device with a low overload withstands less than 1
It is possible to reduce the rank and make the configuration inexpensive.

For this reason, conventionally, two types of inverter devices having different characteristics have been prepared according to the two types of applications, and the user has selected the characteristics according to the use of the load.

[0006]

As a result, in the conventional power supply device, the product must be manufactured according to the characteristics and the capacity. Therefore, in order to meet various demands, the number of products to be prepared has increased, and it has been difficult to manufacture and manage the products. In addition, the user can purchase the power supply at the above 150%
It was necessary to determine the characteristics of the device such as 1 minute or 120% for 1 minute.

The present invention has been made in view of the above,
It is an object of the present invention to provide a power supply device in which it is not necessary to individually manufacture products according to their characteristics and capacity, and which is easy to manufacture and manage.

Another object of the present invention is to provide a power supply device which can be purchased without determining the characteristics of the device at the purchase stage, and whose characteristics can be arbitrarily changed by the user after purchase.

[0009]

The invention according to claim 1 is
To solve the above problems, characteristic information storage means for storing information about characteristics, table storage means for storing a parameter table corresponding to each characteristic, table selection means, and parameters for driving a power supply unit are stored. A parameter storage unit and a power supply unit driving unit for driving a power supply unit are provided, and the table selection unit reads out information about the characteristic stored in the characteristic information storage unit, and a parameter corresponding to the characteristic indicated by the information. A table is read from the table storage means, parameters relating to characteristics included in the read parameter table are stored in the parameter storage means, and the power supply driving means drives the power supply according to the stored parameters relating to characteristics. That is the summary.

Further, the invention of claim 2 is characterized by: characteristic capacity information storage means for storing characteristic information and capacity information; table storage means for storing a parameter table corresponding to each characteristic and capacity; and table selecting means. A parameter storage unit for storing parameters for driving the power supply unit, and a power supply unit drive unit for driving the power supply unit, wherein the table selection unit is information about the characteristics stored in the characteristic capacity information storage unit. And information relating to capacity, reading a parameter table corresponding to the characteristic and capacity indicated by the information from the table storage means, and storing parameters relating to characteristic and capacity contained in the read parameter table in the parameter storage means. , The power supply driving means includes parameters relating to the stored characteristics and capacity. And summarized in that for driving the power supply unit in accordance with data.

Further, the invention of claim 3 is summarized in that the characteristics of claim 1 or claim 2 can be changed by the user of the apparatus.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Main Points of the Invention) First, the main points of the present invention will be briefly described to assist understanding.

For example, in order to drive an electric motor at a variable speed, a VVVF inverter device capable of outputting a variable frequency and a variable voltage is generally used. In this inverter device, the capacity for driving the electric motor is selected in accordance with the size of the load. That is, if the electric motor has 7.5 kW, the inverter device also uses 7.5 kW.

However, when the characteristics of the load and the operating state are analyzed in detail, it is extremely rare that the electric motor requires a maximum rating of 7.5 kW continuously. In particular, when the load has a squared torque characteristic (characteristic that the torque becomes low in the low speed rotation range) such as a fan or a pump, once the acceleration and deceleration operations are finished, the It can be driven with very little power. Therefore, even if the inverter rating is selected to be 7.5 kW,
In steady state operation, less capacity is needed.

As described above, the fans, pumps, and the like are lightly loaded in the steady state, but they require the most power when accelerating and decelerating the electric motor. At this time, when the power more than the rated value of the inverter device is required instantaneously, the inverter device is designed to compensate the overload withstand of 150% for 1 minute with respect to the normal rated output. It is rare to stop protection due to overload. In addition, in an inverter device designed for a fan or a pump, it is common to have an overload withstanding capacity of 120% for 1 minute because of its load characteristics.

In such a case, if the capacity of the inverter device is designed to be one rank lower (5.5 kW) and the overload withstand capacity is reduced from the usual 150% 1 minute to 120% 1 minute, the rank will be 1 rank. The top (7.5 kW) can be driven, and the same hardware can be commercialized as a 7.5 kW inverter device.

The present invention pays attention to this fact, and uses the same hardware for a plurality of characteristics, for example, 5.5 kW overload tolerance 1.
It enables shipment as two types of products, one for 50% for 1 minute and the other for 7.5 kW overload withstand capacity of 120% for 1 minute. In addition, this property can be switched even at the installation site.

(Embodiment) FIG. 1 shows a hardware configuration of an inverter device 1 of an embodiment, a motor 2 driven by the inverter device 1, and a fan 3 which is a load of the motor 2. . The load is not limited to the fan, but may be a pump, a conveyor, or an elevator.

The inverter device 1 includes a CPU (central processing unit) 11, E ² -PROM (electrically erasable programmable read only memory) 12, FL.
It is composed of an ASH (flash) memory 13, a ROM (read only memory) 14, a RAM (random access memory) 15, an operation panel 16, and an inverter unit 17.

The CPU 11 follows steps S1 to S4 of FIG. 2 in accordance with the program stored in the FLASH memory 13.
And the normal operation control of the inverter unit 17 shown in step S5 of FIG. Further, the memories 12 to 15 store the information shown in FIG.

The operation panel 16 includes an operation unit 18 and a display unit 1.
9 and is mounted on the front surface of the casing of the inverter device 1. The operation unit 18 delays and stops the inverter unit 17 by a DRIVE key 21, a numeric keypad 22, a decimal point key 23, an ENTER (execute / confirm) key 24, a step key 25, a PROGRAM (program) key 26, and a display switching / CLEAR key. 27 and STOP key 28
Equipped with.

Further, the display unit 19 includes the segment monitor 3
1 and 8 lamps (Ctrl, MPa, V,%, rp
It is provided with a lamp with each display of m, A and Hz and an operation mode display lamp 32). Each of these is composed of an LED, and the segment monitor 31 displays the operation state and parameter number, its set value, the state of the inverter unit 17, and the like.

FIG. 3 shows a functional configuration of the inverter device 1 (however, only the portion according to the present invention). The memory 1 is realized by the E ² -PROM 12 in FIG. 1, and each parameter Cd001 to Cd001 to be used for operating the inverter unit 17 is used.
The initial value of Cd999 is stored.

The memory 2 is the FLASH memory 13 of FIG.
The parameter Cd250 is stored. The memory 3 is realized by the ROM 14 of FIG. 1 and stores parameter tables 1 to 21. The memory 4 is realized by the RAM 15 in FIG. 1 and each parameter Cd001 to Cd001 used for operating the inverter unit 17 is used.
It stores Cd999. The table selection means 20 is
It is realized by the CPU 11 of FIG. 1, and the details of the operation will be described later, but with reference to each parameter stored in the memory 1 and the memory 2, from among the parameter tables 1 to 21 stored in the memory 3. The matching parameter table is read out and each parameter included in the table is stored in the memory 4.

Next, the operation of the inverter device 1 will be described. First, referring to Table 1, a description will be given of the two-product characteristic and the dual characteristic of the inverter device 1 adopted in this embodiment.

[0027]

[Table 1] Normally, the inverter device 1 is selected according to the characteristics of the load and the operating state, and a series suitable for a constant torque load or a squared reduced torque load is selected. The inverter device 1 is provided with products corresponding to respective load characteristics, and conventionally, products having different designs have been used.

For example, there is a product called SHF for a constant torque load, and a product called SPF for a squared torque reduction load (Table 1 (A)). The former is 1
The overload withstanding capability of 50% for 1 minute and the latter is the overload withstanding capability of 120% for 1 minute, and the user selects the inverter device 1 according to the intended use. Such a form is referred to as a two-product characteristic here.

On the other hand, Table 1 (B) of the present embodiment example
Then, the series name is one type of SBT, and the form of the dual characteristic corresponding to the two load characteristics is shown.

Although there is one type of series, the constant torque load and the square reduction torque load can be selected as in the case of the characteristics of the two types. The former is 150% overload tolerance of 1 minute, the latter is 1
With the characteristic specification of the overload withstanding capacity of 20% for 1 minute, the user can freely change the setting of the two characteristics by setting the internal parameters of the inverter device 1 (the characteristic cannot be changed by the user with the two-type characteristic).

FIG. 5 shows an example of rating display in the case of double characteristics. The product nameplate has SBT- as TYPE (type)
Described as 0.75K / 1.5K, 0.75K is Table 1
The capacity in the H mode shown in the user setting of (B) is shown, and 1.5K is the capacity in the P mode. And
For each selected characteristic mode, output current (O
UTPUT), applicable motor (MOTOR), and overload withstanding capacity (OVERLOAD). Like this one
Inverter devices capable of having two types of characteristics in one inverter device are expressed as dual characteristics in this embodiment. The nameplate SOURCE is the power supply voltage / frequency, C
HARACTERISTIC represents a characteristic.

The characteristic setting of the double characteristic is performed by the operation panel 16 of the inverter device 1 of FIG. The operation panel 16 is mounted on the front surface of the inverter device 1 as described above,
Read the contents of the parameters stored in the memory 1,
It is a device that can be changed.

When setting the characteristic of the dual characteristic, the user has the parameter number Cd prepared for the characteristic setting in advance.
060 is selected, and arbitrary data indicating the characteristic (1 (H mode) or 2 (P mode)) is input through the operation panel 16. When the characteristic data is input, the other parameters related to the characteristic inside the inverter device 1 are automatically rewritten in association with each other to change the characteristic.

Next, a method for realizing the switching and changing of the characteristics with one model will be described with reference to FIGS. 2 and 3. This method of switching a plurality of characteristics by one model is realized by processing (software) by the CPU 11 using a plurality of nonvolatile memories 1 to 3 and the memory 4 used for the normal operation of the inverter device 1.

First, prior to the normal operation of the inverter device 1, the parameters necessary for the operation of the inverter device 1 are
Each unique parameter number (Cd001 to Cd9
99), the data is written in the nonvolatile memory 1 in advance. This operation is performed using the operation panel 16 of FIG. For example, the operating frequency or the like is written in the parameter number of Cd002.

Since the memory 1 is frequently written by the user's operation, a non-volatile memory E ² -PR0M12 which can be easily read and written is used. Also memory 1
Are areas Cd001 to Cd199 that are open to the user,
It is divided into non-public areas Cd200 to Cd999 for factory adjustment, and a password input is required to access the non-public area, and the user cannot change it carelessly for safety.

When the writing of the parameters to the memory 1 is completed as described above, or when the power supply of the inverter device 1 is turned on ("power supply ON" in FIG. 2), the entire contents of the memory 1 are transferred to the memory 4. (Step S10). The memory 4 is a main memory in which the CPU 11 actually confirms the content of the parameter and controls the operation of the inverter unit 17 according to the content. Since the memory 11 is frequently accessed by the CPU 11, the high-speed RAM 15 is used.
Further, since the data in the memory 4 is transferred every time the power is turned on, it does not have to be non-volatile.

However, in this state, the content of the memory 4 has not yet been confirmed as the data regarding the characteristics. Therefore,
Next, the data relating to the characteristic is overwritten and transferred to the memory 4.

Data relating to the characteristics is stored in Cd0 of the memory 1.
60: User selection, Cd230: Capacity selection, Cd25
0: By determining the table number of the memory 3 according to the contents of the series selection, its location is determined (step S30). However, Cd250: Series selection is C
d280: Cd of the memory 1 with the stored contents of the series final value
It is determined whether to see the contents of 250 or the contents of Cd250 of the memory 2.

The memory 3 is data of a different portion, that is, Cd090: acceleration time, Cd26, depending on the characteristics and capacity of the various inverter devices 1 in advance.
0: Rated current and Cd265: A memory in which information such as capacity is stored with table numbers 1 to 21, respectively. Since there is no need to rewrite it later, read-only ROM14
To use.

The memory 2 is for preventing the characteristics from being easily changed by others after the characteristics are determined at the time of factory shipment. When the content is written to = 1, the content of the Cd250 of the memory 1 is transferred to the memory 2 (step S20), and if the data of the Cd250 is present in the memory 2 thereafter, the content of the memory 1 is ignored and the memory 2 To refer to. Cd280 is written at the time of factory shipment. Also, the memory 1 is initialized by the data initialization operation, but the memory 2 is another nonvolatile memory so that it is not initialized by the initialization operation. As described above, the memory 2 is a large-capacity FLASH memory 13 because the program for the CPU 11 to control the operation of the inverter unit 17 and to perform the process according to the present invention is also stored at the same time.

To determine the table relating to the characteristics of the memory 3, first, the contents of the memory 2 are confirmed, and Cd250
If the data of the memory 2 is stored, the contents of the memory 2 are secured, and if there is no data in the memory 2, the Cd2 of the memory 1 is stored.
Secure 50 data contents.

The model is determined as follows according to the contents of the secured Cd250.

Cd250 = 0: SHF ... a Cd250 = 1: SPF ... b Cd250 = 2: SBT ... c Here, the SBT of c is a dual characteristic model as described above, and depends on the user. It is possible to change the characteristics. When changing by the user, the characteristics are determined by Cd060 as follows.

Cd060 = 1: H mode Cd060 = 2: P mode That is, when the secured Cd250 = “0 or 1”, the characteristic can be determined according to the data content, but Cd250.
When = 2, the characteristic is determined according to the contents of Cd060.

After the characteristics are determined, the capacity (~ V, ~ W) of the inverter device 1 is secured by Cd230: capacity selection.

In the table selecting means 20, the table number (1 to 2) of the memory 3 is used on the basis of this characteristic and capacity confirmation information.
Determine 1).

Data relating to the characteristic held in the determined table number of the memory 3, for example, table 1, that is, Cd090: acceleration time, Cd260: rated current, Cd
265: Each data of the capacity is stored in the memory 4 as described above.
Is overwritten and transferred (step S40), and data relating to the operation of all the inverter devices 1 including this characteristic information is determined.

The CPU 11 controls the driving operation, the protection operation, and various other operations of the inverter unit 17 according to the contents of the memory 4 (step S50).

The present invention is not limited to the above-mentioned embodiment, but the following modifications are possible.

(1) In the embodiment, the parameter table 1 to be referred to by the two parameters of characteristics and capacity
~ 21 has been determined. In such a case, an embodiment of the invention of claim 2 is obtained. However, the capacity is naturally determined by the parts used for each hardware. Therefore, assuming that the capacity is predetermined, the parameter table to be referred to may be determined only by the characteristic parameter. In this case, an embodiment of the invention of claim 1 is provided.

(2) In the embodiment, the overload withstand capability is taken up as an example of the characteristic. The characteristics are not limited to this, and the allowable ambient temperature of the device is one of them. In this case, for example, the hardware used for the power supply device having 7.5 kW and the allowable ambient temperature of 50 degrees is changed to a power supply device having the characteristic of 5.5 kW and the allowable ambient temperature of 80 degrees by changing the characteristics.

(3) The embodiment is an inverter device. However, a similar configuration can be adopted in another device having characteristics and capacity, and a device in which the overload resistance and other characteristics can be changed according to the load condition. For example, the present invention can be applied to a stabilized DC power supply device and the like.

(4) After setting the characteristics, it is effective to display the characteristics on the surface of the apparatus, for example, to display by a 7-segment LED so that the characteristics can be easily confirmed. .

(5) In order to prevent characteristic switching by a third party after factory shipment, the characteristic switching parameter can be set only by the communication function of the shipping inspection personal computer, or A complicated password that changes with time or the like may be used during the parameter changing operation.

(6) Various parameters inside the device that determine the characteristics are stored in a non-volatile memory and data can be saved even after the power is cut off, but these are saved in a memory storage medium such as a FLASH memory card, The power supply device may be detachable from the power supply device, and the characteristic parameter contents of one power supply device may be transferred to another power supply device via the memory storage medium.

(7) In the embodiment, characteristic switching,
Although the change is implemented by software by the CPU 11, these may be performed by switching analog circuits or switches, or rewriting the memory by a host computer or the like using a communication function.

Finally, the correspondence between the configuration of the embodiment and the configuration of the claims will be described. The inverter unit 17 of the embodiment corresponds to the power supply unit in the claims. Similarly, C
PU11 power unit driving means, E ² -PROM12 characteristic information storage means, ROM 14 is a table storage unit, RAM
Reference numeral 15 corresponds to a parameter storage means.

[0059]

According to the present invention as set forth in claim 1, the table selecting means reads the information on the characteristic stored in the characteristic information storing means, and the parameter storing table stores the parameter table corresponding to the characteristic indicated by the information. If the information about the characteristic is rewritten by reading the data from the parameter table, storing the parameter relating to the characteristic included in the read parameter table in the parameter storage means, and driving the power source according to the stored parameter relating to the characteristic. Therefore, one piece of hardware functions as a power supply device having different characteristics. As a result, when the product configuration of a plurality of types is required depending on the market, the characteristics can be shipped as a power supply device of a plurality of types as in the past by setting the characteristics at the factory shipping stage. Therefore, it is not necessary to individually manufacture products according to their characteristics, and the manufacture and management of products become easy.

According to the second aspect of the present invention, the table selecting means reads the information about the characteristic and the information about the capacity stored in the characteristic capacity information storing means, and corresponds to the characteristic and the capacity indicated by the information. The read parameter table is read from the table storage means, the parameters relating to the characteristics and the capacity included in the read parameter table are stored in the parameter storage means, and the power supply drive means is configured to supply the power according to the stored parameters relating to the characteristics and the capacity. By driving the unit, one piece of hardware can function as a power supply device having different characteristics and capacities as long as the information about the characteristics and capacities is rewritten. As a result, when a product configuration of a plurality of product types is required depending on the market, it is possible to ship as a power supply device of a plurality of product types with respective characteristics and capacities as in the conventional case by setting the characteristics and capacity at the factory shipping stage. Therefore, it is not necessary to individually manufacture products according to their characteristics, and the manufacture and management of products become easy.

According to the present invention as set forth in claim 3, since the characteristic of claim 1 or 2 can be changed by the user of the apparatus, as long as this characteristic is rewritten,
One piece of hardware functions as a power supply device having different characteristics at the installation site. As a result, the power supply device can be purchased without determining the load characteristic at the purchase stage, the characteristic can be arbitrarily determined and changed after the purchase, and the range of selection by the user is widened.

[Brief description of drawings]

FIG. 1 is a block diagram showing a hardware configuration, a motor and a fan of an inverter device 1 according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the contents of processing executed by CPU 11.

FIG. 3 is a block diagram showing a functional configuration of the inverter device 1 according to the embodiment of the present invention.

4A and 4B are external views of an inverter device 1 according to an embodiment of the present invention, in which FIG. 4A is a front view and FIG.
FIG.

FIG. 5 is a front view showing an example of a nameplate display regarding double characteristics of the inverter device 1 according to the embodiment of the present invention.

[Explanation of symbols]

1 inverter 2 motor 3 fan 11 CPU 12 E ² -PROM 13 FLASH memory 14 ROM 15 RAM 16 display the operation panel 17 inverter unit 18 operation unit 19 unit 20 table selecting unit 21 DRIVE key 22 numeric keypad 23-point key 24 ENTER (run- (Enter) key 25 Step key 26 PROGRAM (program) key 27 Display switching / CLEAR key 28 STOP key 31 Segment monitor 32 Operation mode display lamp

Claims (3)

[Claims] 1. A characteristic information storage unit that stores information about characteristics, a table storage unit that stores a parameter table corresponding to each characteristic, a table selection unit, and a parameter storage that stores parameters for driving a power supply unit. And a power source drive unit for driving the power source unit, wherein the table selection unit reads out information about the characteristic stored in the characteristic information storage unit and displays a parameter table corresponding to the characteristic indicated by the information. Reading out from the table storage means, storing parameters relating to characteristics included in the read parameter table in the parameter storage means, and the power supply driving means driving the power supply according to the stored parameters relating to characteristics. Characteristic power supply device. 2. A characteristic capacity information storage means for storing information about a characteristic and a capacity, a table storage means for storing a parameter table corresponding to each characteristic and capacity, a table selecting means, and a power supply unit for driving. Parameter storage means for storing the parameters of, and power supply section driving means for driving the power supply section, the table selection means reads the information about the characteristics and the information about the capacity stored in the characteristic capacity information storage means, The parameter table corresponding to the characteristic and capacity indicated by the information is read from the table storage means, the parameter relating to the characteristic and capacity included in the read parameter table is stored in the parameter storage means, and the power supply unit driving means is Drive the power supply unit according to the stored characteristics and parameters relating to capacity A power supply device characterized by: 3. The power supply device according to claim 1, wherein the characteristic is changeable by a user of the device.