JP2018121483A - Power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power converter capable of monitoring a state of DC power supplied to a load.SOLUTION: A power converter includes a conversion part 11 for generating multiple pieces of DC power supplied to multiple loads by converting input power, and controlling so that the multiple pieces of DC power have constant voltage values, respectively, according to the loads 3-1 through 3-n to be connected, a voltage detection part 12 for detecting the voltages of the multiple pieces of DC power supplied from the conversion part to the multiple loads, a current detection part 13 for detecting currents of the multiple pieces of DC power supplied from the conversion part to the multiple loads, and a transmission part 14 for transmitting the voltage values detected by the voltage detection part, and the current values detected by the current detection part to host equipment.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power converter.

  For example, power converters such as DC / DC converters are widely used in industrial facilities such as factories. In such a power conversion device, for example, the output voltage may decrease due to an abnormality such as a connected load. For example, the DC / DC converter disclosed in Patent Document 1 includes a low output voltage detection unit and a low input voltage detection unit, and stops operation until stable operation is possible when an abnormality is detected.

JP 2001-258249 A

  Here, when an abnormality occurs in the DC / DC converter in an industrial facility such as a factory, it is desirable that the host device can grasp the detailed situation in order to grasp the influence on other devices. However, the technique of Patent Document 1 does not have a function of transmitting abnormality details (DC power state) from the DC / DC converter to the host device.

  The objective of this invention made | formed in view of this situation is providing the power converter device which can monitor the state of the direct-current power supplied to load.

  In order to solve the above problems, a power conversion device according to an embodiment of the present invention generates a plurality of DC powers that convert input power to be supplied to a plurality of loads, and the plurality of DCs according to connected loads. A converter that controls each of the electric power to have a constant voltage value; a voltage detector that detects voltages of the plurality of DC powers supplied from the converter to the plurality of loads; and A current detection unit that detects currents of the plurality of DC power supplied to a plurality of loads, and a transmission unit that transmits the voltage value detected by the voltage detection unit and the current value detected by the current detection unit to a host device. And comprising.

  Moreover, in order to solve the said subject, the power converter device which concerns on embodiment of this invention produces | generates the several direct-current power which converts input power and supplies to several load, The said some according to the load connected A conversion unit that controls each of the DC powers to have a constant voltage value, a voltage detection unit that detects voltages of the plurality of DC powers supplied from the conversion unit to the plurality of loads, and the conversion unit. A current detection unit that detects currents of the plurality of DC power supplied to the plurality of loads, a voltage value detected by the voltage detection unit, a current value detected by the current detection unit, and a rated output value An abnormality determination unit that determines abnormality of the conversion unit, and a transmission unit that transmits an abnormality determination result of the abnormality determination unit to a host device.

  In the power conversion device according to the embodiment of the present invention, the conversion unit may be a DC / DC converter.

  In the power conversion device according to the embodiment of the present invention, the conversion unit may be an AC / DC converter.

  In addition, the power conversion device according to the embodiment of the present invention may include at least one of the plurality of loads therein.

  The power converter according to the embodiment of the present invention can monitor the state of DC power supplied to the load.

It is a block diagram which shows the structural example of the power converter device which concerns on this embodiment. It is a block diagram which shows the structural example of the power converter device which concerns on another embodiment. It is a block diagram which shows the structural example of the power converter device of a comparative example.

  Hereinafter, some embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a block diagram illustrating a configuration example of a power conversion device 1 according to the present embodiment. In the present embodiment, the power conversion device 1 includes a conversion unit 11, a voltage detection unit 12, a current detection unit 13, and a transmission unit 14. Further, the power conversion device 1 is connected to a DC power source 2, loads 3-2 to 3 -n (n is an integer of 2 or more), and a higher-level device 4. The power conversion apparatus 1 is a power supply apparatus that supplies DC power to loads 3-1 to 3-n, for example. Further, for example, the loads 3-2 to 3 -n may be motors, and the power conversion device 1 may be a device that drives the motors. The host device 4 is a device that controls and monitors the device (including the power conversion device 1), and may be a personal computer, for example.

  The conversion unit 11 is a DC / DC converter in the present embodiment. The converter 11 is connected to the DC power supply 2 and converts DC power (input power) input from the DC power supply 2 into a plurality of DC power. The conversion unit 11 may be a flyback converter, for example. The conversion unit 11 converts the input DC power and generates a plurality of DC powers to be supplied to the loads 3-1 to 3-n. In addition, the conversion unit 11 performs control so that each of the plurality of DC powers has a constant voltage value according to the load 3 to be connected. Here, in this specification, a part or all of the loads 3-1 to 3-n may be expressed as the load 3.

  For example, the load 3 may be used inside the power conversion device 1 like the load 3-1, or used outside the power conversion device 1 like the loads 3-2 to 3 -n. It may be a thing. In the present embodiment, the power conversion device 1 includes at least one of the plurality of loads 3-1 to 3-n (load 3-1) inside. Here, all of the plurality of loads 3-1 to 3-n may be inside the power conversion device 1. Further, all of the plurality of loads 3-1 to 3-n may be outside the power conversion device 1.

  The voltage detection unit 12 detects the voltage of the electric power output from the conversion unit 11 and input to the load 3. The voltage detection unit 12 outputs the detected voltage value to the transmission unit 14.

  The current detection unit 13 detects the current of the electric power output from the conversion unit 11 and input to the load 3. Further, the current detection unit 13 outputs the detected current value to the transmission unit 14.

  The transmission unit 14 transmits the voltage value detected by the voltage detection unit 12 and the current value detected by the current detection unit 13 to the host device 4.

(Comparative example)
Here, the effect of the power conversion device 1 of the present embodiment will be described with reference to FIG. 3 while showing the power conversion device 1 of the comparative example.

  FIG. 3 is a block diagram illustrating a configuration example of the power conversion device 1 of the comparative example. The power conversion device 1 of the comparative example includes only the conversion unit 11. That is, the power conversion device 1 of the comparative example does not include the voltage detection unit 12, the current detection unit 13, and the transmission unit 14. That is, the power conversion device 1 of the comparative example does not include a component for notifying the host device 4 of an abnormality.

  On the other hand, in the power conversion device 1 according to the present embodiment, the transmission unit 14 transmits the voltage value detected by the voltage detection unit 12 and the current value detected by the current detection unit 13 to the host device 4. Therefore, the host device 4 can immediately grasp the details even when an abnormality occurs in the power conversion device 1 according to the present embodiment.

  As described above, according to the power conversion device 1 according to this embodiment, the output voltage value and the output current value of the conversion unit 11 are transmitted to the host device 4. That is, the host device 4 can monitor the output voltage value and output current value of the conversion unit 11.

  Further, according to the present embodiment, the host device 4 can calculate the power consumption for the load 3 from the output voltage value and the output current value of the converter 11.

  Moreover, according to this embodiment, the high-order apparatus 4 can detect separately the abnormality of the output part of the conversion part 11 with respect to the load 3-1 to 3-n connected in multiple numbers. That is, the host device 4 can determine which output unit of the conversion unit 11 is abnormal. Here, the host device 4 is also provided inside the power conversion device 1 like the load 3-1, similarly to the external loads 3-2 to 3-n connected to the power conversion device 1. It is possible to detect an abnormality in the output unit of the conversion unit 11.

[Second Embodiment]
FIG. 2 is a block diagram illustrating a configuration example of the power conversion device 1 according to the present embodiment. Compared with the power converter device 1 according to the first embodiment, the power converter device 1 according to the present embodiment further includes an abnormality determination unit 15 and a rated output value storage unit 16. Here, in FIG. 2, the same elements as those in FIG.

  The voltage detection unit 12 outputs the detected voltage value to the abnormality determination unit 15. The current detection unit 13 outputs the detected current value to the abnormality determination unit 15. Further, the voltage detection unit 12 may output the detected voltage value to the transmission unit 14. In addition, the current detection unit 13 may output the detected current value to the transmission unit 14.

  The abnormality determination unit 15 determines the abnormality of the conversion unit 11 based on the voltage value detected by the voltage detection unit 12, the current value detected by the current detection unit 13, and the rated output value from the rated output value storage unit 16. Here, the rated output value includes a rated output voltage value and a rated output current value. In the present embodiment, the abnormality determination unit 15 also determines an abnormality in the conversion unit 11 using the allowable fluctuation value of the output voltage from the rated output value storage unit 16. By using the allowable fluctuation value of the output voltage, the abnormality determination unit 15 can avoid determining that the temporary voltage fluctuation is abnormal and can perform abnormality determination with higher accuracy. The abnormality determination unit 15 outputs a determination result (abnormality determination result) as to whether or not the output unit of the conversion unit 11 has an abnormality to the transmission unit 14.

  The rated output value storage unit 16 stores in advance the respective rated output values (rated output voltage value and rated output current value) and the allowable variation value of the output voltage for the plurality of DC powers output from the conversion unit 11. .

  Here, a method will be described in which the abnormality determination unit 15 determines whether the output unit of the conversion unit 11 is abnormal.

  The abnormality determination unit 15 calculates the difference between the voltage value input to the load 3-1 transmitted from the voltage detection unit 12 and the rated output voltage value stored in the rated output value storage unit 16. The abnormality determination unit 15 determines that the output unit connected to the load 3-1 of the conversion unit 11 is abnormal when the calculated voltage value difference exceeds the allowable fluctuation value of the output voltage stored in the rated output value storage unit 16. Judge that there is. The abnormality determination unit 15 determines that the output unit connected to the load 3-1 of the conversion unit 11 is normal when the calculated voltage value difference is equal to or less than the allowable fluctuation value of the output voltage. The abnormality determination unit 15 performs the same determination on the voltage values input to the other loads 3-2 to 3 -n.

  In addition, the abnormality determination unit 15 converts the conversion unit 11 when the current value input to the load 3-1 transmitted from the current detection unit 13 exceeds the rated output current value stored in the rated output value storage unit 16. It is determined that the output unit connecting the load 3-1 is abnormal. When the current value input to the load 3-1 transmitted from the current detection unit 13 is equal to or lower than the rated output current value, the abnormality determination unit 15 has an output unit that connects the load 3-1 of the conversion unit 11. Determined to be normal. The abnormality determination unit 15 performs the same determination on the current values input to the other loads 3-2 to 3 -n.

  The abnormality determination unit 15 performs abnormality determination on the voltage value and the current value from the load 3-1 to the load 3-n, that is, all the output units of the conversion unit 11.

  The transmission unit 14 transmits the abnormality determination result of the abnormality determination unit 15 to the host device 4. Further, the transmission unit 14 may transmit the voltage value detected by the voltage detection unit 12 and the current value detected by the current detection unit 13 to the higher-level device 4.

  As described above, according to the present embodiment, since the host device 4 receives the abnormality determination result from the abnormality determination unit 15 using the rated output value, the state of the output voltage value and the output current value of the conversion unit 11 It can be grasped more accurately.

  Also in this embodiment, the host device 4 can individually detect an abnormality in the output unit of the conversion unit 11 with respect to a plurality of connected loads 3-1 to 3-n.

  Although the present invention has been described based on the drawings and embodiments, it should be noted that those skilled in the art can easily make various variations and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention.

  For example, the data transmitted from the transmission unit 14 to the upper device 4 may be transmitted by the upper device 4 to another device. For example, data may be transmitted from the host device 4 to a personal computer installed at a location away from the power conversion device 1 via the Internet.

  Moreover, in this embodiment, although the power converter device 1 converts the input power from the direct-current power supply 2 into several direct-current power, it is not this limitation. For example, a power supply device including an AC / DC converter that converts the AC power input from the AC power source into a plurality of DC powers using the DC power source 2 as an AC power source may be used. That is, the conversion unit 11 may be an AC / DC converter.

  Moreover, in this embodiment, although the power converter device 1 supplies direct-current power to the load 3-1 to 3-n connected in multiple numbers, it is not this limitation. For example, the load 3 may be one instead of a plurality.

DESCRIPTION OF SYMBOLS 1 Power converter 2 DC power supply 3,3-1,3-2,3-n Load 4 Upper apparatus 11 Converter 12 Voltage detector 13 Current detector 14 Transmitter 15 Abnormality determination unit 16 Rated output value storage unit

Claims (5)

A converter that converts the input power to generate a plurality of DC powers to be supplied to a plurality of loads, and controls each of the plurality of DC powers to have a constant voltage value according to a connected load;
A voltage detection unit that detects voltages of the plurality of DC powers supplied from the conversion unit to the plurality of loads;
A current detection unit that detects currents of the plurality of DC powers supplied from the conversion unit to the plurality of loads;
A power conversion apparatus comprising: a transmission unit that transmits a voltage value detected by the voltage detection unit and a current value detected by the current detection unit to a host device. A converter that converts the input power to generate a plurality of DC powers to be supplied to a plurality of loads, and controls each of the plurality of DC powers to have a constant voltage value according to a connected load;
A voltage detection unit that detects voltages of the plurality of DC powers supplied from the conversion unit to the plurality of loads;
A current detection unit that detects currents of the plurality of DC powers supplied from the conversion unit to the plurality of loads;
An abnormality determination unit that determines an abnormality of the conversion unit based on a voltage value detected by the voltage detection unit, a current value detected by the current detection unit, and a rated output value;
A power conversion apparatus comprising: a transmission unit that transmits an abnormality determination result of the abnormality determination unit to a host device.   The power conversion device according to claim 1, wherein the conversion unit is a DC / DC converter.   The power conversion device according to claim 1, wherein the conversion unit is an AC / DC converter.   The power converter according to any one of claims 1 to 4, comprising at least one of the plurality of loads therein.

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