JP2016013043A - Electric leakage detection device and power supply controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric leakage detection device and a power supply controller capable of precisely detecting AC electric leakage and DC electric leakage.SOLUTION: An electric leakage detection device 1 has a detection section 2 which includes: an AC detection section 21, DC detection section 22 and a compensation section 23. The detection section 2 is disposed on a power line 6 between an AC power source 3 and a converter 4 which converts an AC voltage applied from the AC power source 3 into a DC voltage to output the same to a load 5. The AC detection section 21 detects an AC electric leakage I1 which occurs between the load 5 and a detection point 61 which is set on the power line 6. The DC detection section 22 detects a DC electric leakage I2 which occurs between the detection point 61 and the load 5. The compensation section 23 reduces induction noises which are induced on the power line 6 by a magnetic flux generated by the DC detection section 22 when detecting a DC electric leakage I2 between the AC detection section 21 and the DC detection section 22.

Description

  The present invention generally relates to a leakage detection device and a power supply control device, and more particularly to a leakage detection device and a power supply control device that detect both AC leakage and DC leakage.

  For example, in a system that uses an AC power source such as a system power source or a distributed power source to charge a storage battery installed in an electric vehicle or a plug-in hybrid vehicle, the conversion converts the AC voltage applied from the AC power source into a DC voltage. A vessel is used. In such a system, an AC current flowing between the AC power source and the converter or a DC current flowing between the converter and the storage battery may leak outside the power line. A leakage detection device that detects both current leakage and current leakage is required.

  As an example of such a leakage detection device, a cable that can supply commercial power AC power to the power receiving port on the power receiving side, and a leakage breaker that blocks power supply to the power receiving port when AC leakage is detected. An earth leakage circuit breaker for a power supply device is proposed (for example, see Patent Document 1). The earth leakage breaker includes a DC earth leakage detection unit that detects a DC earth leakage current, and interrupts power supply to the power receiving port based on the detection output. With this earth leakage breaker, not only AC earth leakage but also power supply to the power storage unit can be interrupted when DC earth leakage occurs.

JP 2000-270463 A

  In the above conventional example, when the DC leakage detection unit is configured such that the induction noise is induced on the cable by the magnetic flux generated when detecting the DC leakage, the induction noise affects the detection accuracy of the AC leakage. There is a possibility of effect.

  The present invention has been made in view of the above-described reasons, and an object thereof is to provide a leakage detection device and a power supply control device that can accurately detect AC leakage and DC leakage.

  The leakage detection device of the present invention includes a detection unit provided on a power line between a converter and an AC power source that converts an AC voltage applied from an AC power source into a DC voltage and outputs the voltage to a load. An AC detector for detecting AC leakage generated between the detection point set on the power line and the load, a DC detector for detecting DC leakage generated between the detection point and the load, and the DC leakage And a compensation unit that reduces induction noise induced on the power line by magnetic flux generated in the DC detection unit between the AC detection unit and the DC detection unit.

  The power supply control device of the present invention includes a converter that converts an AC voltage applied from an AC power source into a DC voltage and outputs the DC voltage to a load, and the above leakage detection device.

  According to the present invention, it is possible to provide a leakage detection device and a power supply control device that detect AC leakage and DC leakage with high accuracy.

It is a block diagram which shows simply the connection relation of the electric leakage detection apparatus of Embodiment 1. It is explanatory drawing which shows simply the connection relation of the supply system of Embodiment 1, and the position of the detection point in a supply system. FIG. 3 is a configuration diagram simply illustrating a configuration of a first detector in the first embodiment. It is a block diagram which shows simply the structure of the 2nd detector in Embodiment 1. FIG. 3 is a configuration diagram simply illustrating a configuration of a third compensator in the first embodiment. It is a block diagram which shows simply the connection relation of the leak detection apparatus in Embodiment 2. It is a block diagram which shows simply the connection relation of the leak detection apparatus in Embodiment 3.

(Embodiment 1)
FIG. 1 shows a leakage detection device 1 according to this embodiment. This leakage detection device 1 includes a detection unit 2 having an AC detection unit 21, a DC detection unit 22, and a compensation unit 23. The detection unit 2 converts the AC voltage applied from the AC power source 3 (see FIG. 2) into a DC voltage and outputs it to the load 5 on the power line 6 between the AC power source 3 and the converter 4 (see FIG. 2). Is provided. The AC detector 21 detects an AC leakage I1 that occurs between the detection point 61 set on the power line 6 and the load 5. The DC detection unit 22 detects a DC leakage I2 generated between the detection point 61 and the load 5. The compensation unit 23 reduces induction noise induced on the power line 6 between the AC detection unit 21 and the DC detection unit 22 by the magnetic flux generated in the DC detection unit 22 when the DC leakage I2 is detected.

  In the present embodiment, the AC component of leakage occurring between the detection point 61 and the load 5 is AC leakage I1, and the DC component is DC leakage I2.

  Hereinafter, the configuration of the leakage detection device 1 in the present embodiment will be described in detail. However, the configuration described below is merely an example of the present invention, and the present invention is not limited to the following embodiment, and various modifications can be made according to design and the like.

  The leakage detection device 1 of this embodiment is used in the supply system 100 shown in FIG. Supply system 100 is, for example, a charging system that charges a storage battery mounted in an electric vehicle, and includes converter 4 for AC / DC conversion having a switching element. The converter 4 converts the AC voltage applied from the AC power source 3 (50/60 Hz) into a DC voltage, and charges the load 5 by outputting the DC voltage to the load 5 that is a storage battery of the electric vehicle. This converter 4 has a circuit for switching a switching element at a high frequency, and the converter 4 has three types of currents: a low frequency (50/60 Hz) AC current, a high frequency AC current, and a DC current. To do.

  When charging the load 5 using this supply system 100, two types of leakages, that is, AC leakage I1 and DC leakage I2, can occur. Since the AC voltage supplied from the AC power supply 3 is converted into a DC voltage by the converter 4, if current leaks between the AC power supply 3 and the converter 4, there is a possibility that an AC leakage I1 occurs. . When a current leaks in the converter 4, there is a possibility that a low frequency (50/60 Hz) AC leakage I1, a high frequency AC leakage I1, and a DC leakage I2 may occur. Further, when a current leaks between the converter 4 and the load 5, a DC leakage I2 may occur. Among these, when DC leakage I2 occurs, the leakage current from the leakage point between the converter 4 and the load 5 flows to the ground, so that the leakage point → ground → AC power supply 3 → converter 4 → leakage. A current of DC leakage I2 flows through a path called a point.

  In the present embodiment, the low-frequency (50/60 Hz) AC leakage I1 and the high-frequency AC leakage I1 are detected by one AC detector 21 as described later. Therefore, hereinafter, the low-frequency (50/60 Hz) AC leakage I1 and the high-frequency AC leakage I1 are collectively referred to as AC leakage I1.

  When leakage does not occur during charging of the load 5 by the supply system 100, the current flows through the two power lines 6 at the detection point 61 provided on the two power lines 6 connecting the AC power supply 3 and the converter 4. The current is balanced between the forward path and the return path. Therefore, the vector sum of the currents entering / exiting the detection point 61 is zero.

  When AC leakage I1 or DC leakage I2 occurs when charging the load 5 by the supply system 100, the current flowing through the two power lines 6 at the detection point 61 is unbalanced between the forward path and the return path. Therefore, the vector sum of the currents entering and exiting the detection point 61 does not become zero.

  The leakage detection device 1 according to the present embodiment is installed at a detection point 61 and detects the difference between the currents flowing through the two power lines 6 at the detection point 61, that is, the current imbalance in the supply system 100. The leakage I1 and the DC leakage I2 are detected. The detection point 61 does not indicate one point on the power line 6 but indicates a range in which the AC leakage I1 and the DC leakage I2 are detected in the power line 6.

  As shown in FIG. 1, the earth leakage detection device 1 includes a detection unit 2, a cutoff unit 7, and a switch 8.

  The detection unit 2 includes an AC detection unit 21, a DC detection unit 22, and a compensation unit 23.

  As shown in FIG. 6, the AC detection unit 21 includes a first detector 211 attached to the power line 6 and a first determination unit 214 that determines the presence or absence of AC leakage I1, and is generated in the supply system 100. The AC leakage I1 is detected.

  In the present embodiment, the first detector 211 is a zero-phase current transformer having a detection core 212 and a detection winding 213 as shown in FIG. The detection core 212 is a toroidal core using a high magnetic permeability soft magnetic material such as permalloy, for example, and a detection winding 213 is wound around the detection core 212. The AC detection unit 21 is installed in the detection core 212 so as to penetrate the two power lines 6 at the detection point 61, and detects the AC leakage I1 by detecting the difference between the currents flowing through the two power lines 6. At normal times when the AC leakage I1 is not generated, the magnetic fluxes generated by the currents flowing through the two power lines 6 cancel each other and are in an equilibrium state, so that no current flows through the detection winding 213. On the other hand, when the AC leakage I1 occurs, a current difference occurs between the currents flowing through the two power lines 6, so that the magnetic flux generated by these currents cannot be balanced, and the detection winding 213 has 2 A current (detection current) corresponding to the current difference of the power lines 6 flows. Thus, the first detector 211 outputs the detection current corresponding to the AC leakage I1 as the first detection value when the AC leakage I1 occurs.

  The first determination unit 214 determines whether or not AC leakage I1 is generated based on an AC reference time (for example, 0.3 seconds) and an AC reference value (5 mA). If the output value (for example, effective value) of the first detection value continues for the AC reference time or longer than the AC reference value, AC leakage I1 occurs in supply system 100. Otherwise, it is determined that AC leakage I1 has not occurred. In addition, the 1st discrimination | determination part 214 outputs a leak signal to the interruption | blocking part 7, when it determines with AC leakage I1 having generate | occur | produced.

  As shown in FIG. 4, the DC detection unit 22 controls the excitation signal, the second detector 221 attached to the power line 6 separately from the first detector 211, the excitation unit 225 that generates an excitation signal. And a control unit 226. The DC detection unit 22 further includes a second determination unit 224 that determines the presence or absence of the DC leakage I2, and detects the DC leakage I2 generated in the supply system 100.

  The second detector 221 is, for example, a flux gate type sensor having an excitation detection core 222 and an excitation detection winding 223. The excitation detection core 222 is a toroidal core using a high magnetic permeability soft magnetic material such as permalloy, for example, and an excitation detection winding 223 is wound around the excitation detection core 222. The second detector 221 is installed in the excitation detection core 222 so as to pass through the two power lines 6 at the detection point 61, and the magnetization of the excitation detection core 222 according to the difference in current flowing through the two power lines 6. The DC leakage I2 is detected by detecting a change in characteristics.

  The excitation unit 225 applies an alternating current (excitation signal) having periodicity to the excitation detection winding 223. When an excitation signal is applied to the excitation detection winding 223, a magnetic flux is generated in the excitation detection core 222, and the magnetization characteristic of the excitation detection core 222 with the vertical axis representing the magnetic flux density and the horizontal axis representing the magnitude of the magnetic field is a point with respect to the origin. Draw a symmetrical curve. At this time, due to the magnetic saturation of the excitation detection core 222, the excitation current flowing in the excitation detection winding 223 changes abruptly. When the DC leakage I2 occurs in the supply system 100 and the DC leakage I2 occurs in the power line 6, a magnetic flux is generated in the excitation detection core 222, and the magnetization characteristics change. That is, the magnetization characteristic is not a point-symmetric curve with respect to the origin, and there is a difference in the timing at which the exciting current changes between when the DC leakage I2 is not generated and when it is generated.

  The control unit 226 performs control to add a control signal that makes this deviation zero to the excitation signal. The control signal is detected by a detection resistor Rs provided between the control unit 226 and the excitation unit 225. Since the magnitude of the detected control signal is a value corresponding to the DC leakage I2, the second detector 221 converts the magnitude of the control signal into a current and outputs it as a second detected value.

  The second determination unit 224 determines whether or not the DC leakage I2 is generated based on the DC reference time (for example, 10 seconds) and the DC reference value (for example, 6 mA). If the output value of the second detection value continues for the DC reference time and is equal to or greater than the DC reference value, the second determination unit 224 determines that DC leakage I2 has occurred in supply system 100, and so on. Otherwise, it is determined that no DC leakage I2 has occurred. In addition, the 2nd discrimination | determination part 224 outputs a leak signal to the interruption | blocking part 7, when it determines with the direct current | flow earth leakage I2 having generate | occur | produced.

  Here, in the second detector 221 of the DC detection unit 22, an excitation current flows through the excitation detection winding 223, thereby generating an induction noise that is an induction current in the power line 6 penetrating the excitation detection core 222. .

  In the present embodiment, the compensator 23 includes a compensator 231 (see FIG. 1) attached to the power line 6 between the first detector 211 and the second detector 221, and is generated from the DC detector 22. Inductive noise used for detecting the DC leakage I2 is reduced.

  As shown in FIG. 5, the compensator 231 includes a compensation core 232 having the same shape as the excitation detection core 222 and a compensation winding 233 having the same shape as the excitation detection winding 223. The compensation unit 23 is installed at the detection point 61 so as to penetrate the two power lines 6 through the compensation core 232 between the first detector 211 and the second detector 221. An inverted signal obtained by inverting the excitation signal by the inverting circuit 234 is applied to the compensation winding 233. As a result, the compensator 231 generates a compensation component in the power line 6 by inverting the phase of the induction noise generated in the power line 6 by the second detector 221.

  The interruption unit 7 interrupts the switch 8 when either the AC leakage I1 or the DC leakage I2 is generated in the supply system 100. As shown in FIG. 6, the blocking unit 7 includes, for example, an OR circuit 71 and a drive circuit 72. When the AC leakage I1 or the DC leakage I2 occurs in the supply system 100, the OR circuit 71 receives a leakage signal from either the first determination unit 214 or the second determination unit 224. The OR circuit 71 calculates the logical sum of the determination result of the first determination unit 214 and the determination result of the second determination unit 224, thereby causing any one of the AC leakage I1 and the DC leakage I2 to leak in the supply system 100. Is determined to have occurred, and a drive signal is output to the drive circuit 72. When the drive circuit 72 receives the drive signal from the OR circuit 71, the drive circuit 72 outputs a cutoff signal for shutting off the switch 8.

  The switch 8 is, for example, a relay having a normally closed contact, and the switch 8 is turned off by a cutoff signal from the cutoff unit 7. If the switch 8 is in an off state, the power supply to the load 5 is cut off.

  In the above configuration, the first determination unit 214, the second determination unit 224, the excitation unit 225, the control unit 226, and the blocking unit 7 are functions of a microcomputer (microcomputer), for example. Realized by executing the program.

  Hereinafter, the operation of the leakage detection device 1 in the present embodiment will be described in detail.

  When no leakage occurs in the supply system 100, the first detection value is not output from the first detector 211, and the first detection value does not exceed the AC reference value. Does not output a leakage signal to the interrupting unit 7. Also in the second detector 221, the second detection value does not exceed the DC reference value, so the second determination unit 224 does not output a leakage signal to the interrupting unit 7. Therefore, the interruption unit 7 does not receive a leakage signal from either the AC detection unit 21 or the DC detection unit 22. Therefore, the cutoff unit 7 does not output a cutoff signal to the switch 8, and the switch 8 is turned on and power is supplied to the load 5.

  When the AC leakage I1 occurs in the supply system 100, the first detector 211 outputs a first detection value corresponding to the AC leakage I1, and the first detection value continues for the AC reference time. If it is equal to or higher than the AC reference value, the first determination unit 214 outputs a leakage signal to the interruption unit 7. On the other hand, in the second detector 221, the second detection value does not exceed the DC reference value, so the second determination unit 224 does not output a leakage signal to the interrupting unit 7. Therefore, the DC detection unit 22 does not output a leakage signal to the interruption unit 7, but since the leakage signal is output from the AC detection unit 21, the interruption unit 7 determines that an electric leakage has occurred in the supply system 100. Moreover, since the interruption | blocking part 7 outputs an electrical leakage signal to the interruption | blocking part 7, and the interruption | blocking part 7 outputs an interruption | blocking signal, the switch 8 will be in an OFF state and the electric power supply to the load 5 will be interrupted | blocked.

  When the DC leakage I2 occurs in the supply system 100, the first detection value is not output from the first detector 211, and the first detection value does not exceed the AC reference value. Does not output a leakage signal to the interrupting unit 7. On the other hand, the second detector 221 outputs a second detection value corresponding to the DC leakage I2, and if the second detection value continues for the DC reference time and is equal to or greater than the DC reference value, the second detection value is output. The discriminating unit 224 outputs a leakage signal to the interrupting unit 7. Therefore, the AC detection unit 21 does not output a signal to the interruption unit 7, but since the leakage signal is output from the DC detection unit 22, the interruption unit 7 determines that an electric leakage has occurred in the supply system 100. Moreover, since the interruption | blocking part 7 outputs the interruption | blocking signal, the switch 8 will be in an OFF state and the electric power supply to the load 5 will be interrupted | blocked.

  As described above, according to the configuration of the leakage detection device 1 of the present embodiment, the detection unit 2 includes the AC detection unit 21 and the DC detection unit 22 that detect the AC leakage I1, and the AC in the supply system 100 The leakage I1 and the DC leakage I2 can be detected. In addition, the leakage detection device 1 includes a compensation unit 23 for reducing induction noise generated in the power line 6 by an excitation signal used for detection of the DC leakage I2. Therefore, when no leakage occurs in the supply system 100, the leakage detection device 1 is less likely to malfunction due to the influence of inductive noise on the detection of the AC leakage I1. Therefore, the leakage detection device 1 of the present embodiment can accurately detect the AC leakage I1 and the DC leakage I2.

  As in the present embodiment, the leakage detection device 1 is based on the detection result of the detection unit 2, and either the AC leakage I1 or the DC leakage I2 is generated between the AC power supply 3 and the load 5. It is desirable to further include a blocking unit 7 that blocks power supply to the load 5. Thereby, when either the AC leakage I1 or the DC leakage I2 is detected in the supply system 100, the supply to the load 5 can be cut off.

  As shown in FIG. 6, the leakage detection device 1 further includes a test power line 9 for a leakage test, and the test power line 9 is preferably used for both the AC leakage I1 test and the DC leakage I2 test. The detection core 212, the excitation detection core 222, and the compensation core 232 are further passed through the test power line 9 different from the power line 6, and for example, currents simulating the AC leakage I1 and the DC leakage I2 are supplied during maintenance. Thereby, the leakage test of both AC leakage I1 and DC leakage I2 can be carried out with a pair of test power lines 9. Further, using this test power line 9, offset correction of the leakage current value in the first determination unit 214 and the second determination unit 224 can be performed.

  As in the present embodiment, the AC detection unit 21 desirably includes a first detector 211 that is attached to the power line 6 and outputs an output corresponding to the AC leakage I1. In addition, as in the present embodiment, the DC detection unit 22 preferably includes a second detector 221 that is attached to the power line 6 and performs output corresponding to the DC leakage I2, separately from the first detector 211. . Thereby, each of the AC leakage I1 and the DC leakage I2 can be detected separately, and each detected value can be handled separately in setting the discrimination criterion, calculating the amount of leakage, and the like.

  As in this embodiment, the AC detector 21 generates an AC leakage I1 if the output value of the first detector 211 is continuously greater than or equal to a predetermined AC reference value for a predetermined AC reference time. It is desirable to have the 1st discrimination | determination part 214 comprised so that it may discriminate | determine. Further, as in this embodiment, the DC detector 22 generates a DC leakage I2 if the output value of the second detector 221 continues for a predetermined DC reference time and is equal to or greater than the predetermined DC reference value. It is desirable to have a second discriminating unit 224 configured to discriminate that it is in progress. Thereby, different discrimination criteria can be provided for each of AC leakage I1 and DC leakage I2. In addition, the leakage detection device 1 does not cut off the power supply to the load 5 when the output value of either the first detector 211 or the second detector 221 instantaneously exceeds a predetermined reference value. The power supply to the load 5 can be cut off only when the output value satisfies all the determination criteria.

  As in the present embodiment, the second detector 221 includes a core and a winding wound around the core, and the DC detection unit 22 includes an excitation unit 225 that applies an excitation signal to the winding. desirable. Moreover, it is desirable that the compensation unit 23 is configured to reduce the induced noise by generating an alternating current having a phase opposite to that of the induced noise on the power line 6 as in the present embodiment. By using the excitation signal, it is possible to accurately detect the DC leakage I2 of about several mA. In addition, since the inductive noise generated by the excitation signal can be reduced by the compensation unit 23, the leakage detection can be performed without lacking the detection accuracy of the AC leakage I1.

  As in the present embodiment, the compensation unit 23 preferably includes a compensation core 232 and a compensation winding 233 wound around the compensation core 232. As a result, a compensation component whose phase is inverted with respect to the induced noise generated in the power line 6 can be generated in the power line 6, and therefore the induced noise can be efficiently reduced with a simple configuration.

  As in the present embodiment, the second detector 221 desirably uses the core as a detection core that detects the DC leakage I2. Thereby, compared with having two cores for excitation and detection, the leakage detection device 1 can be reduced in weight and size.

  The first detector may not be a current transformer as in the present embodiment, but may be a sensor using a Hall element or a magnetoresistive element (MR element). By using these sensors, it is possible to reduce the size of the leakage detection device 1, but the detection accuracy may be lower than that of the current transformer.

  Moreover, in the 1st detector 211 and the 2nd detector 221, the detection core 212 and the excitation detection core 222 can be divided | segmented, and the attachment to an electric wire may be simple.

  The switch 8 does not need to be installed between the converter 4 and the load 5 as in this embodiment, and may be installed between the AC power supply 3 and the converter 4, for example. The switch 8 may have another configuration as long as the power supply from the interrupting unit 7 to the load 5 can be interrupted.

  As shown in FIG. 2, the converter 4 that converts the AC voltage applied from the AC power supply 3 into a DC voltage and outputs the DC voltage to the load 5 and the leakage detection device 1 constitute a part of the power supply control device 200. It is desirable to have. The power supply control device 200 is used in a supply system 100 that charges a storage battery (load 5) mounted on an electric vehicle by an AC power supply 3 as in the present embodiment, for example. In this supply system 100, the power supply control device 200 is built in, for example, a CCID (Charging Circuit Interrupt Device) included in a power supply cable that connects the AC power supply 3 and the vehicle body. The power supply control device 200 may be built in a stationary charging stand. Thereby, the conversion of the alternating voltage applied from the alternating current power supply 3 into the direct current voltage and the detection of the alternating current and direct current leakage during power supply can be performed by one apparatus.

(Embodiment 2)
The leakage detection device 1 according to the present embodiment is different from the first embodiment in that the detection unit 2 includes a first external terminal 215 and a second external terminal 227. The first external terminal 215 outputs a value corresponding to the effective current value of the AC leakage I1 from the output value of the first detector 211. The second external terminal 227 outputs a value corresponding to the current value of the DC leakage I2 from the output value of the second detector 221.

  In the present embodiment, the leakage detection device 1 includes a first calculation unit 216 between the first detector 211 and the first determination unit 214, as shown in FIG. In addition, a second calculation unit 228 is provided between the second detector 221 and the second determination unit 224. Further, the first calculation unit 216 has a first external terminal 215, and the second calculation unit 228 has a second external terminal 227.

  The first calculation unit 216 and the second calculation unit 228 are functions of a microcomputer, for example, and the first external terminal 215 and the second external terminal 227 are output pins of a microcomputer, for example.

  The first calculation unit 216 calculates the effective value of the leakage amount of the AC leakage I1 from the first detection value, and outputs a value corresponding to the calculated effective value from the first external terminal 215. The second calculation unit 228 calculates the amount of leakage of the DC leakage I2 from the second detection value, and outputs a value corresponding to the value calculated from the second external terminal 227.

  With the above configuration, the leakage detection device 1 can not only cut off the supply to the load 5 when leakage occurs in the supply system 100 but also output the leakage amount to the outside and notify the surroundings. Further, by having two external terminals for AC leakage I1 and DC leakage I2, the type of leakage (AC leakage I1 / DC leakage I2) and the amount of leakage can be notified to the outside.

  Note that the detection unit 2 may not include the first calculation unit 216 and the second calculation unit 228, and the first detection value output from the first detector 211 is used as the first external terminal. And the second detection value output from the second detector 221 may be output from the second external terminal.

  Other configurations and operations are the same as those of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Leakage detection apparatus 2 Detection part 200 Power supply control apparatus 21 AC detection part 211 1st detector 214 1st discrimination | determination part 215 1st external terminal 22 DC detection part 221 2nd detector 222 Excitation detection core (core, Core for detection)
223 Excitation detection winding (winding)
224 2nd discrimination | determination part 225 Excitation part 227 2nd external terminal 23 Compensation part 232 Compensation core 233 Compensation winding 3 AC power supply 4 Converter 5 Load 6 Power line 61 Detection point 7 Blocking part 9 Test power line

Claims (10)

A detector provided on a power line between the converter and the converter that converts the AC voltage applied from the AC power source into a DC voltage and outputs it to the load;
The detection unit detects an AC leakage generated between a detection point set on the power line and the load, and detects a DC leakage generated between the detection point and the load. A direct current detector, and a compensator for reducing inductive noise induced on the power line by magnetic flux generated in the direct current detector when detecting the direct current leakage between the alternating current detector and the direct current detector. A leakage detecting device characterized by comprising: A blocking unit that blocks power supply to the load when one of the AC leakage and the DC leakage occurs between the AC power source and the load based on a detection result by the detection unit; The leakage detecting device according to claim 1, further comprising: Further equipped with a test power line for a leakage test,
The leakage test apparatus according to claim 1, wherein the test power line is used for both the AC leakage test and the DC leakage test. The AC detection unit includes a first detector that is attached to the power line and performs output according to the AC leakage,
4. The DC detector according to claim 1, further comprising: a second detector that is attached to the power line and performs output corresponding to the DC leakage separately from the first detector. 5. The leakage detection device according to item. The AC detection unit is configured to determine that the AC leakage has occurred if the output value of the first detector is continuously greater than or equal to a predetermined AC reference value for a predetermined AC reference time. A first discriminating unit that is
The DC detection unit is configured to determine that the DC leakage has occurred if the output value of the second detector is continuously greater than or equal to a predetermined DC reference value for a predetermined DC reference time. The leakage detection device according to claim 4, further comprising a second determination unit. The detection unit outputs a value corresponding to the effective current value of the AC leakage from the output value of the first detector, and the DC leakage current from the output value of the second detector. It has a 2nd external terminal which outputs the value according to an electric current value. The earth-leakage detection apparatus as described in any one of Claim 4 or 5 characterized by the above-mentioned. The second detector has a core and a winding wound around the core;
The DC detection unit has an excitation unit that applies an excitation signal to the winding,
The said compensation part is comprised so that the said induction noise may be reduced by generating the alternating current of an antiphase with the said induction noise on the said power line. The any one of Claims 4 thru | or 6 characterized by the above-mentioned. The leakage detection device according to item. The leakage detecting device according to claim 7, wherein the compensation unit includes a compensation core and a compensation winding wound around the compensation core. The leakage detector according to claim 7, wherein the second detector also uses the core as a detection core that detects the DC leakage. A power supply control device comprising: a converter that converts an AC voltage applied from an AC power source into a DC voltage and outputs the DC voltage to a load; and the leakage detection device according to any one of claims 1 to 9. .

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