KR101466305B1 - Diode monitoring system - Google Patents

Diode monitoring system Download PDF

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Publication number
KR101466305B1
KR101466305B1 KR20130135247A KR20130135247A KR101466305B1 KR 101466305 B1 KR101466305 B1 KR 101466305B1 KR 20130135247 A KR20130135247 A KR 20130135247A KR 20130135247 A KR20130135247 A KR 20130135247A KR 101466305 B1 KR101466305 B1 KR 101466305B1
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KR
South Korea
Prior art keywords
diode
converter
capacitor
voltage
node
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KR20130135247A
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Korean (ko)
Inventor
조택현
Original Assignee
삼성중공업 주식회사
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Publication of KR101466305B1 publication Critical patent/KR101466305B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
    • 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
    • H02J9/061—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 DC powered loads

Abstract

A diode monitoring system for reverse current prevention is disclosed. The diode monitoring system for the reverse current prevention comprises a circuit unit including: a first series connection structure wherein a first converter (120), an inductor (210), and a forward first diode (140) are connected in order; a second series connection structure wherein a second converter (130) and a forward second diode (150) are connected in order; a capacitor (220) which is connected in parallel based on a node N1 and a node N2; and a switch (230) which is connected to the node N2 and the node N3 between the inductor (210) and the first diode (140). The diode monitoring system for the reverse current prevention comprises a monitoring unit (240) which performs on/off control of the switch and determines one or more troubles between the first diode (140) and the second diode (150) using the change of a voltage value of both ends regarding at least one among the first converter (120), the second converter (130), and the capacitor (220).

Description

Diode monitoring system for reverse current prevention [0002]

The present invention relates to a diode monitoring system for preventing reverse current.

The ship is provided with a variety of power-consuming devices to which DC power and / or AC power must be supplied. In order to ensure stable operation of the ship, stable power supply is required for each power consuming device, and Korean Utility Model Publication No. 2007-0018998 (DC Power Supply and Distribution System for Ship), Korean Laid-Open Patent No. 2013-0034089 System), and the like, suggest a stable power supply methodology.

FIG. 1 is a schematic circuit diagram for supplying DC power to a power-consuming device provided in a ship.

As shown in FIG. 1, the load 110, which is a power consuming device, receives a DC power of a predetermined magnitude from the converters 120 and 130 that convert the supplied AC power into DC power.

In this case, a plurality of converters such as the first converter 120 and the second converter 130 may be provided to increase the reliability of the power system, and diodes 140 and 150 may be provided in the forward direction . The diodes 140 and 150 serve to protect the system from being transmitted to other converters that normally operate when the failure occurs in one of the converters.

For example, if the voltage V1 across both ends of the first converter 120 is 0V due to the failure of the first converter 120, if the first diode 140 is not provided, the current output from the second converter 130 To the first converter 120 side.

However, if an earth fault occurs at this time, an infinite current flows through the closed circuit, so that the voltages applied to the first and second converters 120 and 130 may all become 0 V, Therefore, a failure may also occur in the second converter 130 that has operated normally.

However, as shown in FIG. 1, even if diodes 140 and 150 are installed for protection of the system through prevention of reverse current, if the internal voltage barrier is broken due to instantaneous overcurrent applied to each of the diodes 140 and 150, There is a problem in that the system fails to operate and operates as a short circuit.

Patent Document 1: Korean Patent Publication No. 2007-0018998 (Ship DC Power Supply and Distribution System) Patent Document 2: Korean Laid-Open Patent Application No. 2013-0034089 (Ship Power Supply System)

The present invention is to provide a diode monitoring system for preventing reverse current flow, which can ensure stability of a power supply system by monitoring whether or not a reverse current prevention diode provided in a DC power supply circuit is normally operated.

Other objects of the present invention will become readily apparent from the following description.

According to an aspect of the present invention, there is provided a diode monitoring system for preventing reverse current flow, comprising: a first converter 120; a first serial connection structure in which an inductor 210 and a first diode 140 in forward direction are sequentially connected; A second series connection structure in which a first diode 130 and a forward diode 220 are sequentially connected and a capacitor 220 are connected in parallel to each other with reference to a node N1 and a node N2, 140), and a switch (230) connected to the node (N2); And a control circuit for performing on / off control of the switch and controlling a voltage between both ends of at least one of the reference elements including at least one of the first converter (120), the second converter (130) and the capacitor (220) And a monitoring unit (240) for determining whether at least one of the first diode (140) and the second diode (150) is faulty using the variation of the first diode (140) and the second diode (150).

The monitoring unit 240 monitors the voltage value of either one of the first converter 120 and the second converter 130 among the reference elements after the sequential on operation and the off operation of the switch 230 It can be determined that at least one of the first diode 140 and the second diode 150 corresponding to the converter having the both end voltage values is broken.

After the sequential on-operation and the off-operation of the switch 230, the monitoring unit 240 monitors whether the voltage across the capacitor 220 is less than the voltage across the reference electrode It can be determined that the first diode 140 has failed.

The circuit unit may further include a node N4 located between the second converter 130 and the second diode 150 and a capacitor 410 connected to the node N2.

The reference unit further includes the capacitor 410. The monitoring unit 240 monitors the voltage across the capacitor 410 immediately after the switch 230 is turned on and off sequentially It is determined that the second diode 150 is out of order.

The monitoring unit 240 may perform the on-operation of the switch for a predetermined time predetermined for each predetermined period of time.

The load 110 may be connected in parallel based on the node N1 and the node N2.

Other aspects, features, and advantages will become apparent from the following drawings, claims, and detailed description of the invention.

According to the embodiment of the present invention, the stability of the power supply system can be improved by monitoring whether or not the reverse current prevention diode provided in the DC power supply circuit is normally operated.

1 is a schematic circuit diagram for supplying a DC power source to a power taking device provided in a ship according to the prior art.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a diode monitoring system for preventing reverse current flow according to an embodiment of the present invention.
3 is a flowchart illustrating a method of monitoring a reverse current prevention diode according to an embodiment of the present invention.
4 is a diagram schematically showing a configuration of a reverse current prevention diode monitoring system according to another embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In addition, the terms "part," "unit," "module," "device," and the like described in the specification mean units for processing at least one function or operation, Lt; / RTI >

It is to be understood that the components of the embodiments described with reference to the drawings are not limited to the embodiments and may be embodied in other embodiments without departing from the spirit of the invention. It is to be understood that although the description is omitted, multiple embodiments may be implemented again in one integrated embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

3 is a flowchart illustrating a method of monitoring a diode for preventing reverse current according to an embodiment of the present invention. FIG. 4 is a flowchart illustrating a method of monitoring a reverse current prevention diode according to an embodiment of the present invention. Is a diagram schematically showing a configuration of a reverse current prevention diode monitoring system according to another embodiment of the present invention.

Referring to FIG. 2, the diode monitoring system for preventing reverse current flow may include a circuit unit and a monitoring unit 240.

The circuit unit includes a first converter 120 and a second converter 130 for converting AC power into DC power and providing the DC power to the load 110 as a power consuming device. Of course, a converter may be additionally provided to enhance the stability of the power system.

Specifically, the circuit unit includes a first series connection structure in which a first diode 120, an inductor 210, and a first diode 140 forwardly connected on a power supply path are sequentially connected, and a capacitor 220 is connected to a node N1 and a node N2 And a second series connection structure in which a second diode 130 and a second diode 150 forward in a power supply path are sequentially connected with respect to nodes N1 and N2 and a load 110 are connected in parallel. Also, the switch 230 is connected in parallel with the node N3 and the node N2 located between the inductor 210 and the first diode 140 as a reference.

1, the circuit unit according to the present embodiment includes an inductor 210 interposed between the first converter 120 and the first diode 140, a capacitor 220 connected in parallel to the load 110, And one end of the switch 230 is connected to the node N3 located between the inductor 210 and the first diode 140 and the other end is connected to the negative terminal of the first converter 120 Is added.

The monitoring unit 240 may include a switch 230, a capacitor 220, and a second converter 230 for detecting on / off operations of the switch 230, the voltage of both ends of the second converter 130 and the capacitor 220, Respectively. Also, the monitoring unit 240 may be connected to the first converter 120 for detecting the voltage value across the first converter 120.

2 and 3, a diode monitoring method for preventing reverse current flow under the control of the monitoring unit 240 will be described.

Referring to FIGS. 2 and 3, in step 310, a check period (for example, 10 minutes) is set for monitoring whether the first and second diodes 140 and 150 operate normally.

In step 320, the monitoring unit 240 turns on the switch 230 in the set inspection period and turns off the switch 230 after a predetermined time (for example, 1 second).

When the switch 230 is turned on, the current I1 flows along the closed circuit formed by the first converter 120, the inductor 210 and the switch 230. After the switch 230 is turned off, The current I1 supplied from the first node 120 flows to the node N1 through the first diode 140. [

A part of the current I1 flows to the capacitor 220 side to charge the capacitor 220. At this time, a time interval in which the voltage V3 applied across the capacitor 220 due to the LC resonance phenomenon becomes higher than the voltage V1 applied to the first converter 120 and the voltage V2 applied to the second converter 130 is generated, The capacitor 220 performs discharging.

The current I3 supplied by the discharge of the capacitor 220 flows in the direction of the node N1 and the blocking operation for the current I3 in which the first diode 140 and the second diode 150 are input in the reverse direction is performed normally The current flows only to the side of the load 110, so that the voltage across the first converter 120 and the second converter 130 will not fluctuate.

However, if at least one of the first diode 140 or the second diode 150 fails, the current I3 supplied from the capacitor 220 is supplied to the first converter 120 and / or the second converter 130 side The voltage across the first converter 120 and / or the second converter 130 will fluctuate. In this case, the monitoring unit 240 may include a first diode 120 and / or a second diode 150 disposed at the side of the first converter 120 and / or the second converter 130, It can be judged that it is broken.

That is, the switch 230 periodically raises the charging voltage of the capacitor 220. The duty ratio for increasing the voltage of the capacitor 220 is constantly controlled by the monitoring unit 240, To perform pulse width modulation (PWM). At this time, if the first diode 140 and the second diode 150 are in a normal state, the voltage across the capacitor 220 will rise.

However, if the first diode 140 fails, the LC resonance phenomenon does not occur and the voltage across the capacitor 220 will not fluctuate. If the second diode 150 is faulty, The value will fluctuate. In the case of the embodiment shown in FIG. 4, which will be described later, if the second diode 150 is faulty, the voltage across the second capacitor 410 will rise. Likewise, if the first diode 140 is faulty, the voltage across the first converter 120 will also fluctuate. Therefore, the failure of each of the diodes 140 and 150 can be diagnosed by monitoring the periodic switching operation and the change of the voltage.

The combination of the inductor 210 and the switch 230 disposed on the side of the first converter 120 may also be configured on the side of the second converter 130 to diagnose the failure of each of the diodes 140 and 150 Of course.

Referring again to FIG. 3, in step 330, the monitoring unit 240 measures the voltage across the one or more reference elements, e.g., the first converter 120 and the second converter 130, respectively.

Then, the monitoring unit 240 determines whether the voltage value measured at step 340 is varied with respect to the voltage value measured at the time when the voltage value is measured.

If there is no variation in the voltage across the reference element, proceed to step 320 again.

However, if there has been a change in at least one of the measured voltage values for the reference device, the process proceeds to step 350 where the monitoring unit 240 determines that the diode disposed on the side of the reference device, (E.g., an alarm).

FIG. 4 shows another embodiment of a diode monitoring system for preventing reverse current.

4 is different from the configuration of FIG. 3 in that the reverse current prevention diode monitoring system shown in FIG. 4 includes a node N4 and a second converter 130 located between the second converter 130 and the second diode 150, The second capacitor 410 is connected in parallel to the negative terminal (i.e., node N2).

In this case, if the second diode 150 can not normally perform a broaching operation due to a failure, the first capacitor 220 charged with a high voltage by the ON operation and the OFF operation of the switch 230 is discharged I3 of the first and second converters 120 and 130 are charged to the second capacitor 410 so that the voltage across both terminals of the first capacitor 220 is higher than the voltage between both terminals of the first and second converters 120 and 130, The voltage across the capacitor 410 will be higher or equal to the voltage across the first capacitor 220. [

Therefore, the monitoring unit 240 can determine whether the second diode 150 is normally operated by measuring and comparing the both-end voltage value of the first capacitor 220 and the both-end voltage value of the second capacitor 410 . If the voltage across the second capacitor 410 is higher than the voltage across the capacitor, the second diode 150 may determine that a fault has occurred.

The inductor 210 is disposed only on the first converter 120 side in the reverse current prevention diode monitoring system illustrated in FIGS. 2 and 4. However, the inductor 210 may be additionally disposed on the second converter 130 side. Of course. It is needless to say that the switch 230 may be arranged on the side of the second converter 130 rather than on the side of the first converter 120. [

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims And changes may be made without departing from the spirit and scope of the invention.

110: load 120: first converter
130: second converter 140: first diode
150: second diode 210: inductor
220: capacitor, first capacitor 230: switch
240: monitoring unit 410: second capacitor

Claims (7)

A diode monitoring system for preventing reverse current,
The first converter 120 and the inductor 210 are sequentially connected to the first diode 140 in the forward direction and the second converter 130 and the forward diode 220 are sequentially connected to the first converter 120, A series connection structure and a first capacitor 220 are connected in parallel to each other with reference to nodes N1 and N2 and a node N3 between the inductor 210 and the first diode 140 and a switch (230); And
And controls the on / off control of the switch and controls the first diode (120), the second converter (130), and the capacitor (220) And a monitoring unit (240) for determining whether at least one of the first diode (140) and the second diode (150) is faulty. The method according to claim 1,
The monitoring unit 240 monitors the voltage value of either one of the first converter 120 and the second converter 130 immediately after the sequential on operation and the off operation of the switch 230 And determines that at least one of the first diode (140) and the second diode (150) corresponding to the converter whose both-end voltage value is fluctuated is broken if the voltage is varied with respect to the both-end voltage value. The method according to claim 1,
The monitoring unit 240 may monitor the voltage of the capacitor 220 when the voltage across the capacitor 220 does not fluctuate with respect to the voltage measured across the capacitor 230, 140) is faulty. ≪ / RTI > The method according to claim 1,
Wherein the circuitry further comprises a node N4 located between the second converter 130 and the second diode 150 and a second capacitor 410 connected to the node N2. 5. The method of claim 4,
If the voltage across the second capacitor 410 is greater than the voltage across both terminals of the second capacitor 410 after the sequential on and off operations of the switch 230, (150) is in failure. The method according to any one of claims 2, 3, and 5,
Wherein the monitoring unit (240) performs an on-operation of the switch for a predetermined time predetermined for each predetermined period of time. The method according to claim 1,
Wherein the load (110) is connected in parallel with respect to the node (N1) and the node (N2).
KR20130135247A 2013-11-08 2013-11-08 Diode monitoring system KR101466305B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210127222A (en) * 2019-02-15 2021-10-21 지멘스 에너지 글로벌 게엠베하 운트 코. 카게 Method and apparatus for automatically testing switching members
CN113784867A (en) * 2021-03-04 2021-12-10 华为数字能源技术有限公司 Detection circuit, anti-reverse-irrigation system and charging pile

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09327120A (en) * 1996-06-05 1997-12-16 Nec Corp Detection circuit for failure of diode

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09327120A (en) * 1996-06-05 1997-12-16 Nec Corp Detection circuit for failure of diode

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210127222A (en) * 2019-02-15 2021-10-21 지멘스 에너지 글로벌 게엠베하 운트 코. 카게 Method and apparatus for automatically testing switching members
KR102653766B1 (en) 2019-02-15 2024-04-03 지멘스 에너지 글로벌 게엠베하 운트 코. 카게 Method and apparatus for automatically testing switching members
CN113784867A (en) * 2021-03-04 2021-12-10 华为数字能源技术有限公司 Detection circuit, anti-reverse-irrigation system and charging pile
WO2022183446A1 (en) * 2021-03-04 2022-09-09 华为数字能源技术有限公司 Detection circuit, backflow prevention system, and charging pile
CN113784867B (en) * 2021-03-04 2023-10-20 华为数字能源技术有限公司 Detection circuit, anti-reverse irrigation system and charging pile

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