WO2020105135A1 - 電源装置 - Google Patents
電源装置Info
- Publication number
- WO2020105135A1 WO2020105135A1 PCT/JP2018/042963 JP2018042963W WO2020105135A1 WO 2020105135 A1 WO2020105135 A1 WO 2020105135A1 JP 2018042963 W JP2018042963 W JP 2018042963W WO 2020105135 A1 WO2020105135 A1 WO 2020105135A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power
- switching elements
- voltage
- power supply
- switch circuit
- Prior art date
Links
- 230000005856 abnormality Effects 0.000 claims abstract description 91
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 18
- 239000004065 semiconductor Substances 0.000 description 125
- 238000001514 detection method Methods 0.000 description 21
- 230000002159 abnormal effect Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 11
- 238000007796 conventional method Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/10—Modifications for increasing the maximum permissible switched voltage
- H03K17/107—Modifications for increasing the maximum permissible switched voltage in composite switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
Definitions
- This invention relates to a power supply device.
- Patent Document 1 discloses a power conversion device having a circuit configured by connecting a plurality of self-turn-off type semiconductor switching elements in series.
- detection means for detecting the inability to cut off is provided for each semiconductor switching element.
- the detection means is configured to detect the inability to cut off by using the voltage across the terminals of a GTO (Gate Turn-Off thyristor) which is a semiconductor switching element.
- GTO Gate Turn-Off thyristor
- An instantaneous power failure compensation device (Multiple Power Compensator) as a power supply device for supplying AC power to a load.
- An instantaneous power failure compensator is generally connected between an AC power supply and a load, and supplies stable AC power to the load without interruption even when a power failure or an instantaneous voltage drop occurs in the AC power supply. Can be configured.
- a switch circuit configured by connecting a plurality of semiconductor switching elements in series is provided between the AC power supply and the load. Normally, the AC power of the AC power supply is supplied to the load by turning on the plurality of semiconductor switching elements. On the other hand, when a power failure or momentary voltage drop occurs or a control abnormality occurs, the semiconductor switching elements are shut off (OFF) to shut off the AC power supply, and the bidirectional converter supplies power from the power storage device to the load. Start.
- the output voltage of the switch circuit is supplied with an AC voltage that is synchronized with the AC voltage applied to the input side of the switch circuit, under the control of the bidirectional converter. Therefore, the input voltage and the output voltage of the switch circuit may be at the same voltage level. In such a case, a significant voltage difference does not occur between the terminals of the normally-off semiconductor switching element inside the switch circuit. Therefore, as described in the above-mentioned Patent Document 1, if the terminal voltage of the semiconductor switching element is used, there is a concern that the interruption failure may be erroneously detected.
- the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to prevent an abnormality in a power supply device from interrupting a switch circuit having a plurality of semiconductor switching elements connected in series. It is to detect accurately.
- the power supply device that supplies power to the load includes a switch circuit, a power converter, and a control device that controls the switch circuit and the power converter.
- the switch circuit has an input node connected to the AC power supply and an output node connected to the load.
- the power converter is configured to perform bidirectional power conversion between AC power output to the output node and DC power input to and output from the power storage device.
- the switch circuit includes n (n is an integer of 2 or more) switching elements connected in series between an input node and an output node.
- the control device controls the electric power converter to control the electric power when an abnormality is detected in at least one of the AC power supply and the switch circuit in a state in which a conduction command for conducting the n switching elements is output.
- the control device is configured to convert the DC power of the storage device to AC power that is synchronized with the AC power supplied from the AC power supply during normal operation and supply the AC power to the output node.
- the control device further generates a cutoff command for cutting off the n switching elements during execution of the power conversion in the power converter, and the inter-terminal voltage of the n switching elements is generated during the cutoff command. Based on this, an abnormality regarding the cutoff of the switch circuit is detected.
- the power supply device it is possible to accurately detect an abnormality regarding interruption of a switch circuit having a plurality of semiconductor switching elements connected in series.
- FIG. 6 is a flowchart illustrating a control process of the power supply device according to the first embodiment. It is a block diagram for demonstrating the 1st structural example of the determination part which performs the disconnection abnormality determination process shown to step S05 of FIG. It is a block diagram for demonstrating the 2nd structural example of the determination part which performs the disconnection abnormality determination process shown to step S05 of FIG.
- FIG. 1 is a diagram showing a schematic configuration of a power supply device according to a first embodiment of the present invention.
- power supply device 10 is connected between AC power supply 1 and load 2, and is configured to receive AC power from AC power supply 1 and supply AC power to load 2.
- the power supply device 10 is applied to, for example, a device (for example, a momentary power failure compensation device) that supplies stable AC power to the load 2 without interruption in the event of a power failure or an instantaneous voltage drop of the AC power supply 1. obtain.
- a device for example, a momentary power failure compensation device
- the power supply device 10 may receive three-phase AC power and output three-phase AC power.
- the AC power supply 1 is typically a commercial AC power supply, and supplies AC power having a commercial frequency to the power supply device 10.
- the load 2 is driven by AC power of commercial frequency supplied from the power supply device 10.
- the power supply device 10 includes an input terminal T1, an output terminal T2, a DC terminal T3, a switch circuit 11, a bidirectional converter 12, voltage detectors 14, 16 and 18, and a control device 20.
- the input terminal T1 is electrically connected to the AC power supply 1 and receives the AC power of the commercial frequency supplied from the AC power supply 1.
- the output terminal T2 is connected to the load 2.
- the DC terminal T3 is connected to the battery 3.
- the battery 3 corresponds to an example of “power storage device” that stores DC power. As the power storage device, an electric double layer capacitor may be connected to the DC terminal T3 instead of the battery 3.
- the switch circuit 11 is connected between the input terminal T1 and the output terminal T2, and is configured to switch electrical connection and disconnection between the AC power supply 1 and the load 2. Specifically, the switch circuit 11 has an input node N1 and an output node N2, and n (n is an integer of 2 or more) semiconductor switching elements SW1 to SWn. The input node N1 is connected to the input terminal T1 and the output node N2 is connected to the output terminal T2.
- semiconductor switching elements SW1 to SWn are connected in series between the input node N1 and the output node N2. Conduction (ON) and interruption (OFF) of the semiconductor switching elements SW1 to SWn are controlled by control signals S1 to Sn input from the control device 20, respectively.
- control signals S1 to Sn input from the control device 20, respectively.
- the semiconductor switching element SW is turned on by the control signal S of H (logical high) level and turned off by the control signal S of L (logical low) level. That is, the control signal S of H level corresponds to an ON command (conduction command) for turning on the semiconductor switching element SW, and the control signal S of L level is an OFF command (interruption command) for turning off the semiconductor switching element SW. Equivalent to.
- FWD Freewheeling Diode
- any self-extinguishing type switching element such as IGBT (Insulated Gate Bipolar Transistor), GCT (Gate Commutated Turn-off) thyristor.
- IGBT Insulated Gate Bipolar Transistor
- GCT Gate Commutated Turn-off
- the semiconductor switching element is used as the “switching element” in the switch circuit 11.
- the control device 20 controls ON / OFF to control passage and interruption of current, other switching elements are used.
- the bidirectional converter 12 is connected between the output node N2 of the switch circuit 11 and the DC terminal T3.
- Bidirectional converter 12 is configured to perform bidirectional power conversion between AC power output to output node N2 and DC power input / output to / from battery 3.
- the bidirectional converter 12 corresponds to an example of “a power converter”.
- the bidirectional converter 12 converts the AC power from the AC power supply 1 into DC power and stores the DC power in the battery 3 during normal operation when the AC power is supplied from the AC power supply 1. On the other hand, in the event of a power outage in which the supply of AC power from the AC power supply 1 is stopped or an instantaneous voltage drop of the AC power supply 1 occurs, the bidirectional converter 12 converts the DC power of the battery 3 into AC power of commercial frequency, and AC power is applied to the load 2.
- the bidirectional converter 12 has a plurality of semiconductor switching elements, although not shown. ON / OFF of the plurality of semiconductor switching elements is controlled by a control signal generated by the control device 20.
- the control signal is a pulse signal train and is a PWM (Pulse Width Modulation) signal.
- the bidirectional converter 12 turns on or off a plurality of semiconductor switching elements at a predetermined timing in response to a control signal to generate AC power output at the output node N2 and DC power input / output at the DC terminal T3. Bi-directional power conversion can be performed between.
- the voltage detector 14 detects an AC voltage (hereinafter, also referred to as “input voltage Vin”) input to the input node N1 of the switch circuit 11.
- the voltage detector 16 detects an AC voltage (hereinafter, also referred to as “output voltage Vout”) output to the output node N2 of the switch circuit 11.
- the voltage detector 18 detects the terminal voltage of the semiconductor switching element SW.
- voltage detector 18 is configured to detect the voltage across the collector and emitter terminals of the IGBT.
- the detected values V1 to Vn detected by the voltage detector 18 correspond to the inter-terminal voltages of the semiconductor switching elements SW1 to SWn, respectively.
- inter-terminal voltage V when the inter-terminal voltages V1 to Vn are collectively described, they are also simply referred to as “inter-terminal voltage V”.
- the controller 20 turns on / off the switch circuit 11 (semiconductor switching element SW) and turns on / off the bidirectional converter 12 by using a command from a host controller (not shown) or a detection signal input from the voltage detectors 14, 16 and 18.
- the control device 20 can be composed of, for example, a microcomputer.
- the control device 20 includes a CPU (Central Processing Unit) and a memory (not shown), and executes the control operation described below by software processing by the CPU executing a program stored in advance in the memory. You can Alternatively, part or all of the control operation can be realized by hardware processing using a built-in dedicated electronic circuit or the like instead of software processing.
- FIG. 2 is a diagram for explaining the power supply path during normal times.
- control device 20 controls semiconductor switching elements SW1 to SWn forming switch circuit 11 to control signals S1 to Sn at H level. (Conduction command) is given respectively.
- the switch circuit 11 is turned on, and the AC power supply 1 and the load 2 are electrically connected.
- the AC power from the AC power supply 1 is supplied to the load 2 via the switch circuit 11 as indicated by the arrow in the figure.
- the AC power from the AC power supply 1 is further converted into DC power by the bidirectional converter 12 and stored in the battery 3.
- the control device 20 stops the operation of the bidirectional converter 12.
- FIG. 3 is a diagram for explaining the power supply path at the time of abnormality.
- a power failure occurs when the supply of AC power from AC power supply 1 is stopped, or when an instantaneous voltage drop occurs in which the supply voltage of AC power supply 1 instantaneously drops, the DC power of battery 3 is It is converted into AC power by the directional converter 12, and the AC power is supplied to the load 2 via the output terminal T2.
- the AC voltage (output voltage Vout) output from the bidirectional converter 12 to the output node N2 is input to the input node N1 from the AC power supply 1 before the abnormality occurs (input voltage Vin ),
- the power conversion in the bidirectional converter 12 is controlled. According to this, it is possible to prevent the voltage from fluctuating or being instantaneously interrupted when the power supply path is switched.
- the control device 20 gives the L level control signals S1 to Sn (cutoff command) to the semiconductor switching elements SW1 to SWn of the switch circuit 11, respectively.
- the switch circuit 11 is turned off, and the AC power supply 1 and the load 2 are electrically cut off.
- control device 20 stops the operation of bidirectional converter 12.
- the bidirectional converter 12 is operated and the switch circuit 11 is turned off, so that the load 2 is connected to the load 2 using the power supply path shown in FIG. It is possible to continue supplying stable power. As a result, even when an abnormality occurs in the AC power supply 1 or the switch circuit 11, it is possible to continuously supply stable power to the load 2 without interruption.
- FIG. 4 is a flowchart illustrating a control process of power supply device 10 according to the first embodiment. The control device 20 periodically executes the control process shown in FIG.
- control device 20 determines whether or not the voltage drop of AC power supply 1 has occurred. Specifically, control device 20 determines whether a power failure or an instantaneous voltage drop has occurred in AC power supply 1, based on the detected value of input voltage Vin by voltage detector 14. For example, control device 20 determines whether a power failure or an instantaneous voltage drop has occurred by comparing the maximum value (or effective value) of the detected values of voltage detector 14 with a predetermined reference value.
- the control device 20 determines in step S02 whether or not the switch circuit 11 is abnormal. For example, when a control abnormality occurs due to a failure of at least one semiconductor switching element SW or a failure of an IGBT gate drive circuit included in the semiconductor switching element SW, the control device 20 determines that the switch circuit 11 is abnormal.
- control device 20 When the switch circuit 11 is normal (when NO is determined in S02), the control device 20 gives a conduction instruction to the semiconductor switching element SW of the switch circuit 11 in step S06.
- the control device 20 performs the steps. Proceeding to S03, the DC power of the battery 3 is converted into AC power of commercial frequency by the control of the bidirectional converter 12, and the AC power is given to the load 2.
- the AC voltage (output voltage Vout) output from the bidirectional converter 12 to the output node N2 is synchronized with the AC voltage (input voltage Vin) applied to the input node N1 from the AC power supply 1 before the voltage drop. In such a manner, the power conversion in the bidirectional converter 12 is controlled.
- the battery 3 is switched from charging by the AC power from the AC power supply 1 to discharging for supplying power to the load 2.
- control device 20 issues a cutoff command to the semiconductor switching elements SW1 to SWn of the switch circuit 11 in step S04.
- control device 20 executes a cutoff abnormality determination process for determining whether there is an abnormality in the cutoff of switch circuit 11.
- FIG. 5 is a block diagram for explaining a first configuration example of a determination unit that executes the disconnection abnormality determination processing shown in step S05 of FIG.
- the function of each block shown in FIG. 5 can be realized by software processing and / or hardware processing by the control device 20.
- the determination unit 22A includes a subtractor 30, a comparator 32, n comparators 34_1 to 34_n, a logical sum circuit 36, and a logical product circuit 38.
- the subtractor 30 calculates the voltage difference between the detected value of the input voltage Vin by the voltage detector 14 and the detected value of the output voltage Vout by the voltage detector 16.
- the comparator 32 compares the voltage difference between the input voltage Vin and the output voltage Vout with the threshold value Vth1, and outputs a signal indicating the comparison result. When the voltage difference is larger than the threshold value Vth1, the output signal of the comparator 32 becomes H level, and when the voltage difference is smaller than the threshold value Vth1, the output signal of the comparator 32 becomes L level.
- the threshold value Vth1 corresponds to an example of “first threshold value”.
- the n comparators 34_1 to 34_n receive the inter-terminal voltages V1 to Vn of the semiconductor switching element by the n voltage detectors 18, respectively.
- the comparator 34 compares the inter-terminal voltage V of the corresponding semiconductor switching element SW with the reference value Vref1 and outputs a signal indicating the comparison result.
- the output signal of the comparator 34 becomes H level
- the output signal of the comparator 34 becomes L level.
- the reference value Vref1 corresponds to an example of the “reference value”.
- the logical sum circuit 36 calculates the logical sum (OR) of the output signals of the comparators 34_1 to 34_n and outputs a signal indicating the calculation result.
- the logical product circuit 38 calculates the logical product (AND) of the output signal of the comparator 32 and the output signal of the logical sum circuit 36, and outputs a signal indicating the calculation result.
- the output signal of the AND circuit 38 is output to the outside of the power supply device 10 (for example, the host controller) as the detection signal DET.
- the determination unit 22A when the voltage difference between the input voltage Vin and the output voltage Vout is larger than the threshold value Vth1, p (1 ⁇ p ⁇ n) semiconductor switching elements out of the n semiconductor switching elements SW1 to SWn.
- the H-level detection signal DET is output.
- the determination unit 22A When p semiconductor switching elements SW (1 ⁇ p ⁇ n) that cannot be interrupted are included among the n semiconductor switching elements SW1 to SWn, the determination unit 22A outputs the H-level detection signal DET. ..
- the disconnection abnormality determination processing by the determination unit 22A when the voltage difference between the input voltage Vin and the output voltage Vout is smaller than the threshold value Vth1, the voltage across the terminals of the semiconductor switching element SW that is normally turned off is significant. Since there is no voltage difference, it is not possible to detect the disconnection abnormality.
- the output voltage Vout is generated by the bidirectional converter 12 due to the occurrence of an abnormality in the switch circuit 11 (however, the AC power supply 1 is normal) (S03 in FIG. 4), and a cutoff command is sent to the switch circuit 11.
- the inter-terminal voltage V of the normally-off semiconductor switching element SW becomes a value close to zero voltage. .. Therefore, a significant difference does not appear between the terminal voltage V of the semiconductor switching element SW that cannot be interrupted and the terminal voltage V of the semiconductor switching element SW that is in the OFF state, and as a result, the disconnection abnormality can be detected. Becomes difficult.
- the determination unit 22A is configured to detect the disconnection abnormality based on the inter-terminal voltages V1 to Vn of the n semiconductor switching elements SW1 to SWn, and thus such erroneous detection can be avoided.
- the power supply device 10 As described above, according to the power supply device 10 according to the first embodiment, it is possible to accurately detect the abnormality regarding the interruption of the semiconductor switching element forming the switch circuit.
- FIG. 6 is a block diagram for explaining a second configuration example of the determination unit that executes the disconnection abnormality determination processing shown in step S05 of FIG.
- the function of each block shown in FIG. 6 can be realized by software processing and / or hardware processing by the control device 20.
- the determination unit 22B includes n comparators 40_1 to 40_n, a logical sum circuit 42, and logical product circuits 44 and 46.
- the n comparators 40_1 to 40_n receive the inter-terminal voltages V1 to Vn of the semiconductor switching element by the n voltage detectors 18, respectively.
- the comparator 40 compares the terminal voltage V of the corresponding semiconductor switching element SW with the reference value Vref2, and outputs a signal indicating the comparison result.
- the output signal of the comparator 40 becomes H level
- the output signal of the comparator 40 becomes L level.
- the reference value Vref2 corresponds to an example of the “reference value”.
- the logical sum circuit 42 calculates the logical sum (OR) of the output signals of the comparators 40_1 to 40_n and outputs a signal indicating the calculation result.
- the logical product circuit 44 calculates the logical product (AND) of the output signals of the comparators 40_1 to 40_n and outputs a signal indicating the calculation result.
- the logical product circuit 46 calculates the logical product of the output signal of the logical sum circuit 42 and the inverted signal of the output signal of the logical product circuit 44, and outputs a signal indicating the calculation result. ..
- the output signal of the AND circuit 46 is output to the outside of the power supply device 10 (for example, the host controller) as the detection signal DET.
- each semiconductor switching element SW is normally turned off.
- the logical sum circuit 42 outputs an H level signal and the logical product circuit 44 outputs an L level signal.
- the logical product circuit 46 outputs the H level detection signal DET. Is output.
- the determination unit 22B when the inter-terminal voltage V of the q (1 ⁇ q ⁇ n ⁇ 1) semiconductor switching elements SW out of the n semiconductor switching elements SW1 to SWn is smaller than the reference value Vref2. Then, the H-level detection signal DET is output.
- the detection signal DET is received by receiving the L level output signal of the AND circuit 42. Since it becomes L level, it is not possible to detect the disconnection abnormality. Considering that the probability that the n semiconductor switching elements SW cannot be interrupted at the same time is extremely low, it is considered that there is no defect due to the inability to detect the disconnection abnormality.
- the disconnection abnormality determination processing by the determination unit 22B similarly to the determination unit 22A, when the voltage difference between the input voltage Vin and the output voltage Vout is small, the voltage V between the terminals of the semiconductor switching element SW that cannot be interrupted. And a voltage V between the terminals of the semiconductor switching element SW that has been normally turned off do not appear to be significantly different, which makes it difficult to detect the disconnection abnormality.
- a situation in which an overvoltage is applied to the semiconductor switching element SW that is in the off state does not occur, and thus it is considered that there is no problem due to the detection of the disconnection abnormality.
- the determination unit 22B is configured to detect the disconnection abnormality based on the inter-terminal voltages V1 to Vn of the n semiconductor switching elements SW1 to SWn, and thus such erroneous detection can be avoided.
- the power supply device 10 According to the power supply device 10 according to the second embodiment, it is possible to accurately detect the abnormality regarding the interruption of the semiconductor switching element forming the switch circuit.
- FIG. 7 is a block diagram for explaining a third configuration example of the determination unit that executes the disconnection abnormality determination processing shown in step S05 of FIG.
- the function of each block shown in FIG. 7 can be realized by software processing and / or hardware processing by the control device 20.
- the determination unit 22C includes n comparators 50_1 to 50_n, n AND circuits 52_1 to 52_n, and an OR circuit 54.
- the n comparators 40_1 to 40_n receive the inter-terminal voltages V1 to Vn of the semiconductor switching element by the n voltage detectors 18, respectively.
- the comparators 40_1 to 40_n are collectively described, they are also simply referred to as “comparators 40”.
- the comparator 40 compares the terminal voltage V of the corresponding semiconductor switching element SW with the reference value Vref2, and outputs a signal indicating the comparison result.
- the output signal of the comparator 40 becomes H level
- the output signal of the comparator 40 becomes L level.
- the n logical product circuits 52_1 to 52_n calculate the logical product of the output signals of the n comparators 50_1 to 50_n, and output the signal tail indicating the calculation result.
- the logical product circuits 52_1 to 52_n are collectively described, they are also simply referred to as the “logical product circuit 52”.
- one of the output signals of the n comparators 50 receives the inverted signal thereof.
- the n AND circuits 52 are different from each other.
- the logical sum circuit 54 calculates the logical sum (OR) of the output signals of the logical product circuits 52_1 to 52_n and outputs a signal indicating the calculation result.
- the output signal of the OR circuit 54 is output to the outside of the power supply device 10 (for example, the host controller) as the detection signal DET.
- the comparator 50_1 When any one of the above semiconductor switching elements SW is the semiconductor switching element SW1, the comparator 50_1 outputs an L level signal and the comparators 50_2 to 50_n output an H level signal. Accordingly, the AND circuit 52_1 receives the inverted signal of the output signal of the comparator 50_1 and the output signals of the comparators 50_2 to 50_n and outputs a signal of H level. On the other hand, each of the AND circuits 52_2 to 52_n receives the output signal of the comparator 50_1 and the output signals of the comparators 50_2 to 50_n (one of them is an inverted signal) and outputs an L level signal. As a result, the AND circuit 54 outputs the H-level detection signal DET.
- the determination unit 22C when the inter-terminal voltage V of any one of the n semiconductor switching elements SW1 to SWn is smaller than the reference value Vref2, the H level detection signal is detected. DET will be output.
- the disconnection abnormality determination processing by the determination unit 22C when the two or more semiconductor switching elements SW cannot be shut off, the output signals of the n AND circuits 52 are all at the L level. Abnormality cannot be detected. Therefore, it is preferable that the disconnection abnormality determination processing by the determination unit 22C be applied to the power supply device 10 in which the plurality of semiconductor switching elements SW are unlikely to be unable to be disconnected at the same time.
- the disconnection abnormality determination processing by the determination unit 22C similarly to the determination units 22A and 22B, when the voltage difference between the input voltage Vin and the output voltage Vout is small, the terminals of the semiconductor switching element SW that cannot be shut off are disconnected. Since there is no significant difference between the voltage V and the voltage V between the terminals of the semiconductor switching element SW that has been normally turned off, it is difficult to detect the disconnection abnormality. However, in such a situation, a situation in which an overvoltage is applied to the semiconductor switching element SW that is in the off state does not occur, so it is considered that there is no problem due to the detection of the disconnection abnormality.
- the determination unit 22C is configured to detect the disconnection abnormality based on the inter-terminal voltages V1 to Vn of the n semiconductor switching elements SW1 to SWn, such erroneous detection can be avoided.
- the power supply device 10 According to the power supply device 10 according to the third embodiment, it is possible to accurately detect an abnormality regarding interruption of the semiconductor switching element forming the switch circuit.
- V1 to V4 in the table represent the voltage across the terminals of the semiconductor switching elements SW1 to SW4.
- the value (H or L) of V1 to V4 indicates the output signal level of the comparator to which V1 to V4 is input.
- the output signal of the corresponding comparator 34_1 Becomes H level.
- the output signal of the comparator 34_1 becomes L level.
- the determination unit 22B when the inter-terminal voltage V1 of the semiconductor switching element SW1 is smaller than the reference value Vref2 (V1 ⁇ Vref2), that is, when the semiconductor switching element SW1 cannot be shut off, the corresponding comparator 40_1 ( Alternatively, the output signal of 50_1) becomes L level.
- the output signal of the comparator 40_1 when the inter-terminal voltage V1 of the semiconductor switching element SW1 is larger than the reference value Vref2 (V1> Vref2), that is, when the semiconductor switching element SW1 is normally turned off, the output signal of the comparator 40_1 (or 50_1) is L. It becomes a level.
- the determination unit 22A 22C indicate whether or not the disconnection abnormality can be detected. “OK” indicates that the determination unit can detect the disconnection abnormality, and “NG” indicates that the determination unit cannot detect the disconnection abnormality.
- the determination units 22A to 22C differ in the form of the cutoff abnormality that can be detected. Therefore, the determination units 22A to 22C can be selected depending on what kind of mode is desired to be detected. Alternatively, any one of the determination units 22A to 22C may be selected according to the total number n of the semiconductor switching elements SW included in the switch circuit 11. For example, when n is a relatively large value and it is determined that there is a low possibility that 100% abnormality will occur, the determination unit 22B or 22C can be applied. Further, when it is determined that it is unlikely that two or more semiconductor switching elements SW cannot be shut off at the same time, the determination unit 22C can be applied. On the other hand, the determination unit 22A can be applied when there is a possibility that a total number of abnormalities will occur regardless of the size of n.
- FIG. 9 is a block diagram for explaining a fourth configuration example of the determination unit that executes the disconnection abnormality determination processing shown in step S05 of FIG.
- the determination unit 22 includes determination units 22A to 22C and a selection unit 24 for selecting any one of these determination units.
- the selection unit 24 is provided with a selection signal for selecting a determination unit to be used in the disconnection abnormality determination process from the host controller.
- the selection unit 24 is configured to output the detection signals of the voltage detectors 14, 16, 18 to the determination unit selected by the selection signal.
- the configuration when the voltage difference between the input voltage Vin and the output voltage Vout is small, the configuration may be such that the cutoff abnormality is not detected.
- FIG. 10 is a flowchart illustrating a control process of power supply device 10 according to the fourth embodiment.
- the flowchart of FIG. 10 is obtained by adding the process of step S07 to the flowchart of FIG.
- control device 20 issues a cutoff command to semiconductor switching elements SW1 to SWn of switch circuit 11 in step S04.
- control device 20 determines whether or not the voltage difference (
- > Vth2 when YES is determined in S07, the control device 20 proceeds to step S05, and executes a disconnection abnormality determination process that determines whether or not there is an abnormality in the disconnection of the switch circuit 11.
- ⁇ Vth2 when NO is determined in S07), control device 20 does not perform the disconnection abnormality determination process.
- the power supply device 10 when the voltage difference (
- the determination units 22B and 22C are configured to determine the disconnection abnormality by using only the inter-terminal voltage V of the semiconductor switching element SW, by applying the control processing of the fourth embodiment, the disconnection abnormality is erroneously made. Can be prevented from being detected.
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Abstract
Description
図1は、この発明の実施の形態1に従う電源装置の概略構成を示す図である。
図2を参照して、交流電源1から正常に電力が供給される通常時には、制御装置20は、スイッチ回路11を構成する半導体スイッチング素子SW1~SWnに対して、Hレベルの制御信号S1~Sn(導通指令)をそれぞれ与える。半導体スイッチング素子SW1~SWnがオンすることにより、スイッチ回路11がオン状態となり、交流電源1および負荷2が電気的に接続される。この結果、図中に矢印で示すように、交流電源1からの交流電力はスイッチ回路11を経由して負荷2に供給される。
図3を参照して、交流電源1からの交流電力の供給が停止された停電時、または交流電源1の供給電圧が瞬間的に低下する瞬時電圧低下の発生時、バッテリ3の直流電力が双方向コンバータ12によって交流電力に変換され、その交流電力が出力端子T2を介して負荷2に供給される。
実施の形態2では、遮断異常判定処理を実行する判定部の第2の構成例について説明する。
実施の形態3では、遮断異常判定処理を実行する判定部の第3の構成例について説明する。
上述した第1から第3の制御構成例の判定部22A~22Cによる遮断異常判定処理によれば、入力電圧Vinおよび出力電圧Voutの電圧差が小さい場合には、遮断不能となる半導体スイッチング素子SWの端子間電圧Vと、正常にオフされた半導体スイッチング素子SWの端子間電圧Vとの間に有意差が現れないため、遮断異常を検知することが困難となる。
Claims (6)
- 負荷に電力を供給する電源装置であって、
交流電源に接続される入力ノードと、前記負荷に接続される出力ノードとを有するスイッチ回路と、
前記出力ノードに出力される交流電力と電力貯蔵装置に入出力される直流電力との間で双方向の電力変換を実行するように構成された電力変換器と、
前記スイッチ回路および前記電力変換器を制御する制御装置とを備え、
前記スイッチ回路は、前記入力ノードと前記出力ノードとの間に直列に接続されるn個(nは2以上の整数)のスイッチング素子を含み、
前記制御装置は、前記n個のスイッチング素子を導通するための導通指令を出力している状態において、前記交流電源および前記スイッチ回路の少なくとも一方の異常が検知された場合には、前記電力変換器の制御によって、前記電力貯蔵装置の直流電力を、正常時に前記交流電源から供給される交流電力に同期した交流電力に変換して前記出力ノードへ供給するように構成され、
前記制御装置は、さらに、前記電力変換器における電力変換の実行中に前記n個のスイッチング素子を遮断するための遮断指令を発生し、かつ、前記遮断指令の発生中、前記n個のスイッチング素子の端子間電圧に基づいて前記スイッチ回路の遮断についての異常を検知する、電源装置。 - 前記制御装置は、前記入力ノードおよび前記出力ノードの電圧差が第1の閾値を超えている場合であって、前記n個のスイッチング素子のうちのp個(1≦p≦n)のスイッチング素子の前記端子間電圧が基準値よりも小さいときに、前記スイッチ回路の遮断についての異常を検知する、請求項1に記載の電源装置。
- 前記制御装置は、前記n個のスイッチング素子のうちのq個(1≦q≦(n-1))のスイッチング素子の前記端子間電圧が基準値よりも小さいときに、前記スイッチ回路の遮断についての異常を検知する、請求項1に記載の電源装置。
- 前記制御装置は、前記n個のスイッチング素子のうちいずれかの1個のスイッチング素子の端子間電圧が基準値よりも小さくなったときに、前記スイッチ回路の遮断についての異常を検知する、請求項1に記載の電源装置。
- 前記制御装置は、以下の
(a)前記入力ノードおよび前記出力ノードの電圧差が第1の閾値を超えている場合であって、前記n個のスイッチング素子のうちのm個(1≦m≦n)のスイッチング素子の前記端子間電圧が基準値よりも小さいときに、前記スイッチ回路の遮断についての異常を検知する処理、
(b)前記n個のスイッチング素子のうちのq個(1≦q≦(n-1))のスイッチング素子の前記端子間電圧が基準値よりも小さいとき、前記スイッチ回路の遮断についての異常を検知する処理、
(c)前記n個のスイッチング素子のうちいずれかの1個のスイッチング素子の端子間電圧が基準値よりも小さくなったとき、前記スイッチ回路の遮断についての異常を検知する処理、
のいずれか1つを選択的に実行する、請求項1に記載の電源装置。 - 前記制御装置は、前記遮断指令の発生中、前記入力ノードおよび前記出力ノードの電圧差が第2の閾値よりも小さいときには、前記スイッチ回路の遮断についての異常の検知を行なわない、請求項1から5のいずれか1項に記載の電源装置。
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KR1020207023820A KR102382136B1 (ko) | 2018-11-21 | 2018-11-21 | 전원 장치 |
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