Power converter, and control method therefor

Abstract

To provide a power converter for stopping an output from the power converter in response to detecting the following connection state, when a remote sense line from a loading device is connected to the power converter in reverse polarity.SOLUTION: A power converter (2) comprises an inverter device (10) that converts an AC voltage into a DC voltage to be output to a load (3) via power source lines (LP, LN). The power converter (2) comprises: a control circuit (15) for controlling a voltage of the load so as to compensate a voltage drop relating to each of wiring resistances (R1, R2) of the power source lines (LP, LN) by connecting remote sense lines (SP, SN) connected to the load (3) to sense terminals (T3, T4); and a reverse connection detection circuit (20) for stopping an output of the DC voltage from the inverter device (10) in response to detecting that the remote sense lines (SP, SN) connected to the load (3) are erroneously connected to the sense terminals (T3, T4) in reverse polarity.SELECTED DRAWING: Figure 1A

Description

[Technical field]

[0001] The present invention relates to a power conversion device that includes, for example, an inverter device and has a remote sense line. [Background technology]

[0002] Conventionally, for example, in a switching power supply device including an inverter device, the following remote sensing function using a remote sense line has been provided (for example, see Patent Document 1).

[0003] Even if the output voltage stability is good at the output terminal of the switching power supply, if the distance from the switching power supply to the load becomes long, the voltage drop occurs in the output line due to the load fluctuation, and the voltage stability at the load terminal deteriorates. To prevent this phenomenon, the remote sensing function detects the output voltage at the actual load terminal and compensates for the line voltage drop of the lead wiring connecting the power supply and the load.

[0004] Specifically, the supply voltage, which has become lower than the output voltage due to a voltage drop, is fed back by the remote sensing function, and when the supply voltage is higher than a specified value, the duty ratio of the PWM control of the converter in the switching power supply is reduced, whereas when the supply voltage is lower than the specified value, the duty ratio of the PWM control of the converter in the switching power supply is increased. By controlling in this way, the output voltage is corrected to the specified value, which has the effect of stabilizing the output voltage.

[0005] Fig. 5 is a block diagram showing the configuration of a power supply circuit according to a conventional example disclosed in Patent Document 1. The power supply circuit in Fig. 5 has been disclosed in order to provide a power supply circuit that can adequately protect the power supply circuit against abnormalities on the load side, and is particularly characterized in that, in a power supply circuit having a DC-DC converter 60 and a remote sense protection circuit 50 that protects the DC-DC converter 60, a relay switch 53 is provided as a means for disconnecting the DC-DC converter 60 from the remote sense protection circuit 50 when an abnormality occurs on the load 70 side of the DC-DC converter 60.

[0006] The power supply circuit in FIG. 5 includes a DC-DC converter 60 that supplies an output voltage Vo to a load 70, which is, for example, an electronic device, and a remote sense protection circuit 50. Here, the remote sense protection circuit 50 is composed of a detection circuit 51 for detecting an abnormality on the load 70 side, and a feedback circuit 52 that determines a reference voltage to be fed back to the DC-DC converter 60 (power supply circuit). The detection circuit 51 compares the output voltage Vo of the DC-DC converter 60 with the supply voltage Vrs on the load 70 side to detect an abnormality on the load side. The feedback circuit 52 refers to information from the detection circuit 51 and determines a reference voltage Vsence to be selectively and automatically returned to the power supply circuit feedback system. Here, the output voltage Vo input to the comparison circuit of the detection circuit 51 is constantly compared with the supply voltage Vrs to the load, and when Vrs>Vo, it is determined that an abnormal operation has occurred. In the event of an abnormality, the supply voltage Vrs is disconnected by a relay switch 53, the output voltage Vo is fed back to the DC-DC converter 60, and the lower value in the detection circuit 51 is fed back to the DC-DC converter 60 as the reference voltage Vsence. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2009-194960 A [Patent Document 2] Patent No. 5630832 Summary of the Invention [Problem to be solved by the invention]

[0008] However, if the remote sense line from the load device is connected to the switching power supply with reverse polarity, the remote sense voltage may be mistakenly determined to be significantly smaller than the output voltage, causing the output voltage to increase significantly and potentially damaging the switching power supply.

[0009] An object of the present invention is to provide a power conversion device and a control method thereof that can detect the connection state of a remote sense line from a load device to a power conversion device such as a switching power supply device and stop the output from the power conversion device even if the remote sense line is connected with reverse polarity. [Means for solving the problem]

[0010] A power conversion device according to one aspect of the present invention includes: A power conversion device including an inverter device that converts AC voltage into DC voltage and outputs the DC voltage to a load via a power line, a control circuit for controlling a voltage of the load so as to compensate for a voltage drop associated with a wiring resistance of the power supply line by connecting a remote sense line connected to the load to a sense terminal; a reverse connection detection circuit that detects that a remote sense line connected to the load is erroneously connected to a sense terminal with reverse polarity and stops output of a DC voltage from the inverter device; Equipped with. Effect of the Invention

[0011] Therefore, according to a power conversion device of one aspect of the present invention, even if the remote sense line from the load device is connected to the power conversion device with reverse polarity, the connection state can be detected and the output from the power conversion device can be stopped. [Brief description of the drawings]

[0012] [Figure 1A] 1 is a block diagram showing an example of the configuration of a switching power supply device according to an embodiment; [Figure 1B]FIG. 11 is a block diagram showing a configuration example of a switching power supply device according to a first modified example. [Figure 1C] FIG. 11 is a block diagram showing a configuration example of a switching power supply device according to Modification 2. [Figure 1D] FIG. 11 is a block diagram showing a configuration example of a switching power supply device according to Modification 3. [Diagram 2] FIG. 1 is a block diagram showing a configuration of a switching power supply device according to a first comparative example. [Diagram 3] FIG. 11 is a block diagram showing a configuration of a switching power supply device according to a second comparative example. [Figure 4] 4 is a block diagram of the switching power supply device of FIG. 3 when a remote sense line from a load device is erroneously connected to the switching power supply device with reverse polarity. [Diagram 5] FIG. 1 is a block diagram showing a configuration of a power supply circuit according to a conventional example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, embodiments and modifications of the present invention will be described with reference to the drawings. Note that the same or similar components are denoted by the same reference numerals.

[0014] (Inventor's knowledge) FIG. 2 is a block diagram showing the configuration of a switching power supply device 2A according to Comparative Example 1. The switching power supply device 2A in FIG. 2 is configured to include an inverter device 10, a rectifier circuit 16, a smoothing circuit 17 including an electrolytic capacitor Cs and an inductor Ls, a positive output terminal T1 (+), and a negative output terminal T2 (-). The inverter device 10 generates a predetermined AC voltage by switching an AC voltage from an AC power source 1, and then obtains a predetermined DC voltage via the rectifier circuit 16 and the smoothing circuit 17. The DC voltage is output to a load 3 having a resistor RO, for example, via a pair of power lines LP and NP. R1 and R2 are resistances of the wiring of the power lines LP and NP, and are the same in other FIGS. 1A to 1D, 3, and 4.

[0015] As shown in comparison example 1 in Figure 2, when a current of 10 A is passed through load 3 of resistance R0 away from switching power supply 2A, which is away from the main body of switching power supply 2A and has a total resistance value of 0.2 Ω (= R1 + R2) for the power lines LP and NP, when comparing the voltage at output terminals T1, T2 of switching power supply 2A with the voltage at load 3, a voltage drop of 26V - 24V = 2V occurs.

[0016] Fig. 3 is a block diagram showing the configuration of a switching power supply device according to Comparative Example 2. In order to prevent the voltage drop in Fig. 2, a remote sensing function is used so that a remote sense circuit 18 detects the voltage across the load 3 as a remote sense voltage Vrs via remote sense lines SP, SN, a positive sense terminal T3 (+S), and a negative sense terminal T4 (-S). Then, based on the remote sense voltage Vrs, the remote sense circuit 18 controls the inverter device 10 so as to compensate for the voltage drop and correct the output voltage Vo as shown in Fig. 3. Here, SP is the positive remote sense line, and NP is the negative remote sense line. Also, the sense terminal T3 is marked with +S, and the sense terminal T4 is marked with -S.

[0017] However, since the remote sense lines SP, SN are manually connected to the sense terminals T3 (+S) and T4 (-S) by the user, there are cases where the remote sense lines SP, SN are connected incorrectly.

[0018] Fig. 4 is a block diagram of the switching power supply device 2B of Fig. 3 when the remote sense lines SP, SN from the load device are erroneously connected in reverse polarity to the sense terminals T3 (+S) and T4 (-S) of the switching power supply device 2B. When the erroneous connection occurs as in Fig. 4, the remote sense circuit 18 erroneously determines that the remote sense voltage Vrs based on the load voltage Vor is significantly smaller than the output voltage Vo, causing the output voltage Vo to increase significantly and possibly damaging the switching power supply device 2B. An object of the embodiments of the present invention is to solve this problem.

[0019] (Embodiment) Fig. 1A is a block diagram showing a configuration example of a switching power supply device 2 according to an embodiment. The switching power supply device 2 in Fig. 1A is configured to include an inverter device 10, a rectifier circuit 16, a smoothing circuit 17, a remote sense circuit 18, a positive output terminal T1(+) and a negative output terminal T2(-), and a reverse connection detection circuit 20. Here, the inverter device 10 is configured to include an AC-DC converter 11, a smoothing circuit 12, a PWM inverter circuit 13, an oscillator 14, and a control circuit 15. In addition, the reverse connection detection circuit 20 is configured to include a photocoupler 21, a stop signal generator 22, a resistor R3, and a Zener diode ZD.

[0020] In the inverter device 10 of Fig. 1A, the AC-DC converter 11 generates a predetermined AC voltage by switching the AC voltage from the AC power source 1, and then rectifies the AC voltage to generate a predetermined rectified voltage. The rectified voltage is smoothed by the smoothing circuit 12 and converted into a predetermined DC voltage, and then input to the PWM inverter circuit 13. The oscillator 14 starts oscillating when the inverter device 10 is started, generates a driving oscillation signal, and outputs it to the PWM inverter circuit 13. The PWM inverter circuit 13 generates a PWM voltage from the DC voltage input from the smoothing circuit 12 in synchronization with the driving oscillation signal from the oscillator 14, and then generates a DC output voltage Vo through the rectifier circuit 16 and the smoothing circuit 17. The DC output voltage Vo is output to the load 3 through the power supply lines LP and LN. The control circuit 15 detects the output voltage of the PWM inverter circuit 13 and controls the time width of the PWM signal so as to obtain a predetermined output voltage.

[0021] The load voltage Vor of the load 3 is fed back to the remote sense circuit 18 as a remote sense voltage Vrs via the remote sense lines SP and SN. The remote sense circuit 18 controls the PWM inverter circuit 13 via the control circuit 15 based on the remote sense voltage Vrs so as to compensate for the voltage drop due to the power supply lines LP and LN and correct the voltage to output a predetermined output voltage Vo.

[0022] In the reverse connection detection circuit 20 of FIG. 1A, the sense terminal T3 is an anode sense terminal of the remote sense voltage Vrs, and is connected to the cathode of the diode D1 of the photocoupler 21, and the anode of the diode D1 is connected to the output terminal T1 via the resistor R3 and the Zener diode ZD. Here, the diode D1 and the Zener diode ZD are connected in series to each other via the resistor R3 so that the polarity of the diode D1 and the polarity of the Zener diode ZD are opposite to each other. The diode D1 of the photocoupler 21 is provided to detect the induced voltage Vds (remote sense voltage) at the time of reverse connection. The sense terminal T4 is a cathode sense terminal of the remote sense voltage Vrs, and is grounded. In addition, in the series circuit of the resistor R3 and the Zener diode ZD, the positions of the resistor R3 and the Zener diode ZD connected in series may be interchanged.

[0023] Here, the resistance value of resistor R3 and the Zener voltage of Zener diode ZD define the voltage range (corresponding to the voltage range corresponding to the voltage drop of power supply lines LP, LN) in which the induced voltage Vds in diode D1 of photocoupler 21 can be detected. The remote sense voltage Vrs is expressed by the following equation.

[0024] Vrs = Vo + Vdr + Vds + VR2 (1)

[0025] Here, Vdr is the voltage obtained by adding the Zener voltage of the Zener diode ZD to the voltage drop of resistor R3, and VR2 is the voltage drop of resistor R2. Therefore, by changing the set values ​​of the Zener voltage of the Zener diode ZD and the resistance value of resistor R3, the detection voltage range for incorrect connection in reverse polarity can be changed.

[0026] The following equation is obtained from equation (1) above.

[0027] Vds+Vdr=Vrs-Vo-VR2 (2)

[0028] Here, if the potential difference of the terminal T3 seen from the terminal T1 falls below the potential of Vds+Vdr, the diode D1 emits light, the phototransistor TR1 receives the emitted light, and outputs a predetermined H level signal to the stop signal generator 22. On the other hand, if the potential difference of the terminal T3 seen from the terminal T1 is equal to or higher than the potential of Vds+Vdr, the diode D1 does not emit light, and outputs a predetermined L level signal to the stop signal generator 22. The stop signal generator 22 outputs an L level oscillation stop signal in response to an input H level signal, and outputs an H level oscillation stop signal in response to an input L level signal. Here, when the potential difference of the terminal T3 seen from the terminal T1 falls below the potential of Vds+Vdr, for example, as described above, a user erroneously connects the remote sense lines SP, SN from the load device to the sense terminals T3 (+S), T4 (-S) of the switching power supply device 2 in reverse polarity in the switching power supply device 2.

[0029] As described above, the oscillator 14 performs an oscillating operation when the inverter device 10 is started up, but stops its oscillation output in response to an L-level oscillation stop signal and stops supplying the oscillation signal to the PWM inverter circuit 13. This causes the PWM inverter circuit 13 to stop outputting the PWM voltage, and the output of the DC voltage from the switching power supply device 2 is stopped.

[0030] As described above, according to this embodiment, since the reverse connection detection circuit 20 is provided, even if a user erroneously connects the remote sense lines SP, SN from the load device in the switching power supply 2 to the sense terminals T3 (+S), T4 (-S) of the switching power supply 2 with reverse polarity as described above, the erroneous connection with reverse polarity is detected based on the remote sense voltage Vrs of the sense terminal T3, and the generation of the oscillation signal to the PWM inverter circuit 13 is stopped. This makes it possible to urgently stop the output of DC voltage from the switching power supply 2.

[0031] Therefore, even if the remote sense lines SP, SN are connected with reverse polarity to the sense terminals T3, T4, the switching power supply device 2 will not be destroyed. This allows the user to correctly connect the remote sense lines SP, SN to the sense terminals T3, T4.

[0032] Furthermore, in this embodiment, when the reverse connection detection circuit 20 detects a connection with reverse polarity, the generation of the oscillation signal from the oscillator 14 of the inverter device 10 is stopped, so that the operation of the inverter device 10 can be stopped before the output voltage of the PWM inverter circuit 13 is generated when the inverter device 10 is started.

[0033] (Variation 1) Fig. 1B is a block diagram showing an example of the configuration of a switching power supply device according to Modification 1. In Fig. 1B, the switching power supply device according to Modification 1 differs from the switching power supply device according to the embodiment of Fig. 1A in the following respects. (1) The oscillation stop signal from the stop signal generator 22 is input to the PWM inverter circuit 13 instead of the oscillator 14. In response to the L-level oscillation stop signal, the PWM inverter circuit 13 stops the operation of the PWM inverter circuit 13 or stops the output operation of the output voltage from the PWM inverter circuit 13, thereby stopping the output operation of the output voltage of the inverter device 10. In response to an H-level oscillation stop signal, the PWM inverter circuit 13 continues the operation of the PWM inverter circuit 13 or continues the output operation of the output voltage from the PWM inverter circuit 13. Even with the modified example 1 configured as described above, it is possible to obtain the same effects as those of the embodiment.

[0034] (Variation 2) Fig. 1C is a block diagram showing an example of the configuration of a switching power supply device according to Modification 2. In Fig. 1C, the switching power supply device according to Modification 2 differs from the switching power supply device according to the embodiment of Fig. 1A in the following respects. (1) The oscillation stop signal from the stop signal generator 22 is input to the control circuit 15 instead of the oscillator 14. The control circuit 15 controls the PWM inverter circuit 13 in response to the L-level oscillation stop signal to stop the operation of the PWM inverter circuit 13 or to stop the output operation of the output voltage from the PWM inverter circuit 13, thereby stopping the output operation of the output voltage of the inverter device 10. Note that the control circuit 15 continues the operation of the PWM inverter circuit 13 or to continue the output operation of the output voltage from the PWM inverter circuit 13 by controlling the PWM inverter circuit 13 in response to the H-level oscillation stop signal. Even with the modified example 2 configured as described above, it is possible to obtain the same effects as those of the embodiment.

[0035] (Variation 3) Fig. 1D is a block diagram showing a configuration example of a switching power supply device according to Modification 3. In Fig. 1D, the switching power supply device according to Modification 3 differs from the switching power supply device according to the embodiment of Fig. 1A in the following points. (1) The oscillation stop signal from the stop signal generator 22 is input to the AC-DC converter 11 instead of the oscillator 14. In response to an L-level oscillation stop signal, the AC-DC converter 11 stops operation of the AC-DC converter 11 or stops the output operation of the output voltage from the AC-DC converter 11, thereby stopping the output operation of the output voltage from the inverter device 10. In response to an H-level oscillation stop signal, the AC-DC converter 11 continues operation of the AC-DC converter 11 or continues the output operation of the output voltage from the AC-DC converter 11. Even in the third modification configured as above, it is possible to obtain the same effects as those of the embodiment.

[0036] (Other variations) In the above embodiment, a switching power supply device that converts AC voltage to DC voltage has been described. However, the present invention is not limited to this, and may be applied to a switching power supply device that converts AC power, such as AC current, into DC power, such as DC current.

[0037] In the above embodiment, the inverter device 10 includes the PWM inverter circuit 13, but the present invention is not limited to this, and the inverter device 10 may include other types of inverter circuits.

[0038] In the above embodiment, the switching power supply device 2 has been described, but the present invention is not limited to this, and can be widely applied to power conversion devices including inverter circuits that perform power conversion using driving oscillation signals.

[0039] In the above embodiment, when the reverse polarity connection detection circuit 20 detects a connection with reverse polarity, the generation of the oscillation signal of the oscillator 14 of the inverter device 10 is stopped, and the output of the DC voltage from the inverter device 10 is stopped. However, the present invention is not limited to this, and when the reverse polarity connection detection circuit 20 detects a connection with reverse polarity, the output of the DC voltage from the inverter device 10 may be stopped.

[0040] (Differences between the present invention and Patent Document 2) The object of the invention in Patent Document 2 is to provide a charge / discharge control device or the like that can prevent the occurrence of a fault even when the battery polarity is reversed. The charge / discharge control device includes a voltage detection line that detects the voltage polarity of a secondary battery inserted in a battery box, and a load line that transmits a charging current or discharging current of the secondary battery. Here, the charge / discharge control device is characterized in that, when the polarity of the secondary battery detected by the voltage detection line and the polarity of the secondary battery detected by the load line match, a discharge test of a charge / discharge test program is performed, and, when the polarity of the secondary battery detected by the voltage detection line and the polarity of the secondary battery detected by the load line do not match, the discharge test of the charge / discharge test program is not performed.

[0041] In other words, the invention of Patent Document 2 is configured to detect the voltage generated in a secondary cell such as a battery, and when it detects a reverse polarity connection of the remote sense line to the sense terminal, it switches the connection with a relay switch to protect the internal circuitry.

[0042] In contrast, in this embodiment, the reverse connection detection circuit 20 of the switching power supply device 2 makes an erroneous detection due to reverse connection of the remote sense line, and the inverter device 10 stops before outputting a DC voltage, which is completely different from the invention of Patent Document 2.

[0043] In other words, in the invention of Patent Document 2, the output voltage is already generated by the secondary battery, and the output of the output voltage is not stopped upon erroneous detection of reverse connection of the remote sense line. In contrast, in this embodiment, the output of the output voltage is stopped upon erroneous detection of reverse connection of the remote sense line. [Industrial Applicability]

[0044] As described above in detail, according to the present invention, even if the remote sense line from the load device is connected to the power conversion device with reverse polarity, the connection state can be detected and the output from the power conversion device can be stopped. [Explanation of symbols]

[0045] 1 AC power supply 2. Switching power supply 3. Load 10. Inverter device 11 AC-DC converter 12 Smoothing circuit 13 PWM inverter circuit 14 Oscillators 15 Control circuit 16 Rectifier circuit 17 Smoothing circuit 20 Reverse connection detection circuit 21 Photocoupler 22 Stop Signal Generator 50 Remote Sense Protection Circuit 51 Detection circuit 52 Feedback Circuit 53 Relay Switch 60 DC-DC Converter 70 Load (electronic equipment) Cs electrolytic capacitor Ls Inductor LP,LN power line R1~R3 ​​resistance SP,SN remote sense wire T1, T2 output terminal T3, T4 Sense terminals ZD Zener diode

Claims

1. A power conversion device including an inverter device that converts AC voltage into DC voltage and outputs the DC voltage to a load via a power line, a control circuit for controlling a voltage of the load so as to compensate for a voltage drop associated with a wiring resistance of the power supply line by connecting a remote sense line connected to the load to a sense terminal; a reverse connection detection circuit that detects that a remote sense line connected to the load is erroneously connected to a sense terminal with reverse polarity and stops output of a DC voltage from the inverter device; A power conversion device comprising:

2. The reverse connection detection circuit includes: a photocoupler diode connected to an anode sense terminal of the remote sense line; a series circuit connected to the diode, the series circuit including a resistor and a Zener diode; Equipped with the diode and the Zener diode are connected via the resistor so that the polarity of the diode and the polarity of the Zener diode are opposite to each other; The power conversion device according to claim 1 .

3. the inverter device includes an inverter circuit that converts an AC voltage into a DC voltage based on a driving oscillation signal from an oscillator and outputs the DC voltage to a load via a power supply line; when the reverse connection detection circuit detects that the remote sense line connected to the load is erroneously connected to the sense terminal with reverse polarity, the reverse connection detection circuit stops the generation of the driving oscillation signal by the oscillator and stops the output of the DC voltage from the inverter circuit. The power conversion device according to claim 1 or 2.

4. the inverter device includes an inverter circuit that converts an AC voltage into a DC voltage and outputs the DC voltage to a load via a power supply line; When the reverse connection detection circuit detects that the remote sense line connected to the load is erroneously connected to the sense terminal with reverse polarity, the reverse connection detection circuit stops the generation of a DC voltage by the inverter circuit, or stops the output of a DC voltage from the inverter circuit. The power conversion device according to claim 1 or 2.

5. The inverter device is an inverter circuit that converts an AC voltage into a DC voltage and outputs the DC voltage to a load via a power line; an AC-DC converter provided in a front stage of the inverter circuit and converting an AC voltage into a DC voltage; When the reverse connection detection circuit detects that the remote sense line connected to the load is erroneously connected to the sense terminal with reverse polarity, the reverse connection detection circuit stops the generation of a DC voltage by the AC-DC converter or stops the output of a DC voltage from the AC-DC converter. The power conversion device according to claim 1 or 2.

6. A method for controlling a power conversion device including an inverter device that converts AC voltage into DC voltage and outputs the DC voltage to a load via a power line, comprising: a control circuit controlling a voltage of the load so as to connect a remote sense line connected to the load to a sense terminal and compensate for a voltage drop associated with a wiring resistance of the power supply line; a reverse connection detection circuit detecting that the remote sense line connected to the load is erroneously connected to a sense terminal with reverse polarity and stopping the output of a DC voltage from the inverter device; A control method for a power conversion device comprising:

7. The method for controlling a power conversion device includes: a step in which the inverter device converts an AC voltage into a DC voltage based on a driving oscillation signal from an oscillator, and outputs the DC voltage to a load via a power supply line; when the reverse connection detection circuit detects that the remote sense line connected to the load is erroneously connected to a sense terminal with reverse polarity, stopping generation of a driving oscillation signal by the oscillator and stopping output of a DC voltage from the inverter device; The method for controlling a power conversion device according to claim 6 , further comprising:

8. the inverter device includes an inverter circuit that converts an AC voltage into a DC voltage and outputs the DC voltage to a load via a power supply line; The method for controlling a power conversion device includes: a step of stopping generation of a DC voltage by the inverter circuit or stopping output of a DC voltage from the inverter circuit when the reverse connection detection circuit detects that a remote sense line connected to the load is erroneously connected to a sense terminal with reverse polarity; The method for controlling a power conversion device according to claim 6 .

9. The inverter device is an inverter circuit that converts an AC voltage into a DC voltage and outputs the DC voltage to a load via a power line; an AC-DC converter provided in a front stage of the inverter circuit and converting an AC voltage into a DC voltage; The method for controlling a power conversion device includes: a step of stopping generation of a DC voltage by the AC-DC converter or stopping output of a DC voltage from the AC-DC converter when the reverse connection detection circuit detects that a remote sense line connected to the load is erroneously connected to a sense terminal with reverse polarity; The method for controlling a power conversion device according to claim 6 .

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