KR102404340B1 - system detecting heat generation in wireless power track - Google Patents

Abstract

The present invention is a technology for detecting at which point heat is generated in a wireless power transmission system. In a wireless power transmission system, whether the location of heat is generated from a track cable or from a junction box, for example, is a technology to accurately distinguish and detect the heat generation point. is about According to the present invention, as the heating sensing control member includes a power source member, a current limiting resistance member, a first photocoupler member, a second photocoupler member, and a heating point determining member, the voltage or current applied to both ends of the heat-sensitive wire member There is an advantage of being able to more accurately determine the location of heat generation through the value.

Description

Heat detection system of wireless power track {system detecting heat generation in wireless power track}

The present invention relates to a technology for detecting in advance, before the occurrence of a fire, at which point in a wireless power transmission system heat is generated.

More particularly, the present invention relates to a technology for accurately discriminating and detecting the heat generation point in a wireless power transmission system whether the heat generation location is generated by a track cable or, for example, a junction box.

In general, semiconductor overhead hoist transport (OHT) is installed on a ceiling and moves along a rail of the ceiling.

This semiconductor OHT is designed to receive power wirelessly from a track cable installed along the rail of the ceiling.

Here, since the length required for the track cable installed on the rail of the ceiling is different depending on the field situation where the semiconductor OHT is installed, a plurality of track cables are connected to each other. box) is also formed.

In addition, in order to wirelessly supply power to the semiconductor OHT moving the rail through the track cable, an inverter controlling the power supply to the track cable may be electrically connected to the track cable through a so-called extension cable.

At this time, a so-called junction box is provided at a point where the extension cable and the track cable meet.

However, since the extension box or the junction box is a part to which the core wires of the extension cable or the track cable are connected, the resistance may be greater than that of the surrounding area, and heat generation may occur frequently accordingly.

In addition, since the track cable is generally installed long enough on the ceiling, if the track cable generates heat, if it is known in advance at which point of the track cable the heat is generated, the operator can You will be able to perform post-processing effectively.

In particular, since track cables, extension boxes, and junction boxes that wirelessly supply power to semiconductor OHT are installed on a high ceiling, when performing maintenance, the operator knows the maintenance point in advance and goes up to work, or does the maintenance after climbing to the ceiling. It becomes a very important issue whether to find the points to be done one by one.

The present invention has been proposed in view of the above points, and an object of the present invention is to accurately distinguish at which point among the extension box, the junction box, and the track cable, heat is generated in the ceiling where the semiconductor OHT moves along the rail and the track cable. It is to provide a heat detection system of a wireless power track that can be detected.

In order to achieve the above object, a system for detecting heat in a wireless power track according to the present invention connects an inverter, a track cable receiving power from the inverter, an extension cable connecting the inverter and the track cable, and an extension cable and a track cable A system for detecting heat generation of a wireless power track for monitoring whether heat is generated in a wireless power transmission system having a junction box, comprising: a heat-sensitive wire member (110) disposed sequentially via an inverter, an extension cable, and a track cable; a temperature sensing contact member 120 connected to the heating wire member and switched on/off in response to the temperature of the heat sensing target position, each disposed at one or more preset heat sensing target positions; Heat generation is generated at the heating wire member and the location to be detected by monitoring the voltage (V ₀ ) and current value (I _OHC ) at both ends of the heating wire member, which is energized and connected to the heating wire member and responds to the switching operation of the temperature sensing contact member. It may be configured to include a; heat sensing control member 130 configured to distinguish and detect.

The heat sensing control member 130 includes a power source member 131 mounted at a predetermined position of the heat-sensitive wire member close to the inverter to supply power to the heat-sensitive wire member; a current limiting resistance member 132 connected in series to a heating wire member adjacent to the inverter; a first photocoupler member 133 having a coupler input end connected in series to a heat-sensitive wire member (hereinafter, referred to as a 'thermal wire start end') adjacent to the power source member; a second photocoupler member 134 having a coupler input terminal connected in series to a heat-sensitive wire member (hereinafter, referred to as a 'thermal wire termination') opposite to a starting end of the heat-sensitive wire; It is connected to the coupler output end of the first photocoupler member and the second photocoupler member, and based on a combination of the coupler output end of the first photocoupler member and the coupler output end of the second photocoupler member, the heat-sensitive wire member and the heat sensing target position. A heating point determination member 135 that detects the generation of heat and distinguishes the location of the heat generation from either the location of the heat-sensitive member or the location to be detected based on the voltage (V ₀ ) and the current value (I _OHC ) at both ends of the member of the heat-sensitive wire; can be provided

On the other hand, the temperature sensing contact member 120 is connected in series to the heating wire member and is switched on and off in response to the temperature of the heat sensing target position, maintaining the normally switched on state, and switching off in a heating environment. member 121; may be provided. At this time, the power source member and the heat-sensing switch member are connected in parallel to the corresponding heat-sensing member and are linked to the switching operation of the heat-sensing switch member 121 to obtain a voltage (V ₀ ) and a current (I _OHC ) at both ends of the heat-sensing member. ) to change the contact resistance member 140; may be configured to further include.

On the other hand, the contact resistance member 140 may be configured to have a resistance value greater than the total resistance value of the heat-sensitive wire member.

The present invention is provided with a temperature sensing contact member at one or more preset points, the temperature sensing contact member, an inverter, an extension cable, and a track cable provided with a heat-sensitive wire member disposed sequentially via the track cable, and by classifying the generation of heat at each point As the heating detection control material for sensing is provided, for example, it is possible to accurately classify and detect the location of the heat detection target at which point among the extension box, the junction box, and the track cable installed on the ceiling.

In addition, according to the present invention, as the heating sensing control member includes a power source member, a current limiting resistance member, a first photocoupler member, a second photocoupler member, and a heating point determining member, the voltage or current applied to both ends of the heat-sensitive wire member It also shows the advantage of being able to more accurately determine the location of heat generation by sensing the value.

1 is an exemplary diagram schematically illustrating a wireless power transmission system to which a wireless power track heat detection system according to the present invention will be employed;
[Figure 2] is an exemplary diagram showing the configuration in the junction box as a heat detection system of a wireless power track according to the present invention;
[Figure 3] is a diagram schematically showing a heat detection system of a wireless power track according to the present invention;
[FIG. 4] is an enlarged view of the inverter part extracted from [FIG. 3],
[FIG. 5] is a block diagram showing the number of cases that can be generated in the first and second photocoupler members in a high or low state through the heating point determination member, which is a configuration of the present invention;
[Fig. 6] is an exemplary view showing the parallel resistance value ( _RO ) applied to both ends of the heat-sensitive wire member corresponding to the switching-off of the temperature-sensing contact member, which is a configuration of the present invention;
[Fig. 7] is an exemplary diagram showing a parallel resistance value (R _O ) applied to both ends of the heat-sensitive wire member corresponding to the switching-on of the temperature-sensing contact member, which is a configuration of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

[FIG. 1] is an exemplary diagram schematically illustrating a wireless power transmission system to which a wireless power track heat detection system according to the present invention will be employed, and [FIG. 2] is a junction as a wireless power track heat detection system according to the present invention. It is an exemplary view showing the configuration in the box, [Fig. 3] is a diagram schematically showing the heat detection system of the wireless power track according to the present invention, [Fig. [Fig. 5] is a block diagram showing the number of cases that can occur in the first and second photocoupler members in a high or low state through the heating point determining member, which is a configuration of the present invention, [Fig. 6] is an exemplary diagram showing the parallel resistance value ( _RO ) applied to both ends of the heat-sensitive wire member corresponding to the switching off of the temperature-sensing contact member, which is the configuration of the present invention, and [Figure 7] is the temperature-sensing configuration of the present invention It is an exemplary diagram showing the parallel resistance value ( _RO ) applied to both ends of the heat-sensitive wire member corresponding to the switching-on of the contact member.

1 to 4, the present invention connects the inverter 10, the track cable 20 receiving power from the inverter 10, and the inverter 10 and the track cable 20 A wireless power track heat detection system for monitoring whether heat is generated in a wireless power transmission system having an extension cable 30, and a junction box 50 for connecting the extension cable 30 and the track cable 20, It may be configured to include a heat-sensitive wire member 110 , a temperature-sensing contact member 120 , a heat-sensing control member 130 , and a contact resistance member 140 .

Here, the wireless power transmission system through [FIG. 1] to [FIG. 3] is as follows.

The track cable 20 is disposed in the form of a track on the moving path of the bogie to wirelessly supply power to the bogie moving along the track cable. For this purpose, the track cable 20 is As such, it is connected to the inverter 10 and receives power from the inverter 10 .

And, the track cable 20 is not directly connected to the inverter 10, and the track cable 20 is electrically connected to the inverter 10 through the extension cable 30 as in [Figs. 1] to [Fig. 3]. A so-called junction box 50 is disposed between the track cable 20 and the extension cable 30, and the track cable 20 and the extension cable 30 are mutually connected as shown in [Fig. 1] to [Fig. 3]. connect

Here, the junction box 50 is a so-called terminal block in the process of interconnecting the cable core 21 of the track cable 20 and the cable core 31 of the extension cable 30, as shown in [Fig. 2]. (41) is provided.

And, the core wire connection terminal 41 may be provided with a screw fastening method for fixing each of the cable core wires 21 and 31 to the core wire connection terminal 41, and a plurality of lugs as shown in [Fig. 2] may be provided. have.

At this time, the resistance value may increase due to poor screw fastening or poor crimping of the lugs for fixing the respective cable core wires 21 and 31 to the core wire connection terminal 41 as in [Fig. 2]. There is a fire hazard.

It is necessary to prevent such heat generation or fire risk.

Here, the present invention detects when heat is generated in the wireless power transmission system as in [Figs. Whether or not it occurred at a position corresponding to the track cable 20 is intended to accurately diagnose the heating point.

First, the heat-sensitive wire member 110 may be sequentially disposed via the inverter 10 , the extension cable 30 , and the track cable 20 with reference to FIGS. 1 to 4 .

Preferably, the heat-sensitive wire member 110 constitutes a closed circuit in which two core wires are independently coated and arranged side by side. That is, each of the core wires arranged side by side on the heat-sensitive wire member 110 normally flows independently of each other.

As described above, when current flows independently of each other in each of the core wires provided in the heat-sensitive wire member 110 and heat is generated in a portion adjacent to the heat-sensitive wire member 110, the coated portion of each core wire melts and as a result, they are arranged side by side A short-circuit phenomenon occurs in which each core wire sticks to each other.

If the short-circuit characteristic of the heat-sensitive wire member 110 as described above is utilized, it can be determined whether the region in which the heat-sensitive wire member 110 is disposed generates heat based on the current flowing through the heat-sensitive wire member 110 and the amount of change in the resistance value corresponding to the current. can be detected.

Here, since the heat-sensitive wire member 110 is disposed to be very long by sequentially passing through the inverter 10, the extension cable 30, and the track cable 20, when a short circuit occurs in the heat-sensitive wire member 110, the It is very important that it is possible to check at which position of which configuration adjacent to the heating wire member 110 the short occurs.

The present invention detects heat around itself by utilizing the short-circuit characteristic of the heat-sensitive wire member 110, but allows it to accurately determine at which location the heat is generated.

When the temperature sensing contact member 120 is connected to the heat-sensitive wire member 110 with reference to [Fig. 2] and [Fig. 3], one or more preset heat sensing target positions (eg, junction box, extension box, compensation box) Switching on/off connection may be performed in response to the temperature of the corresponding heat detection target location (eg, junction box, extension box, compensation box) in a state in which each is disposed on the .

Here, the temperature sensing contact members 120 and 120 ′ may include heat sensing switch members 121 and 121 ′ as shown in FIGS. 3 and 6 to 7 .

The heat detection switch members 121 and 121' are connected in series to the heat-sensitive wire member 110 as shown in [Figs. 3] and [Fig. )) is switched on and off in response to the temperature, and preferably, it may be configured to maintain a switched-on state as in [Fig.

The heat sensing control member 130 may be electrically connected to the heating wire member 110 as shown in FIGS. 3 and 4 .

The heat sensing control member 130 responds to the switching operation of the temperature sensing contact member 120 in a state in which it is energized and connected to the heat-sensitive wire member 110 as in [Fig. 3] and [Fig. 4]. By configuring to monitor the voltage (V _O ) and current value (I _OHC ) at both ends of the may be configured to detect.

In this case, when the heat-generating position sensed by the heat-sensing control member 130 is the heat-sensitive wire member 110 , it is preferable to accurately detect the location of the heat-sensitive wire member 110 where heat is generated.

To this end, the heat sensing control member 130 includes a power source member 131 , a current limiting resistance member 132 , a first photocoupler member 133 , a second photocoupler member 134 , and a heating point determining member 135 . ) can be provided.

The power source member 131 may be mounted at a predetermined position of the heat-sensitive wire member 110 close to the inverter 10 to supply power to the heat-sensitive wire member 110 as shown in FIG. 4 .

The current limiting resistance member 132 may be connected in series to the thermal wire member 110 adjacent to the inverter 10 as shown in FIG. 4 .

The first photocoupler member 133 may be serially connected to a heat-sensitive wire member (hereinafter, referred to as a 'thermal wire start end') having a coupler input end close to the power source member 131 as shown in FIG. 4 .

Here, the coupler output end of the first photocoupler member 133 may be connected to the heating point determining member 135 as shown in FIG. 4 .

As a result, when a current flows in the thermal wire member 110 from the power supplied through the power source member 131, the coupler output terminal of the first photocoupler member 133 is in a 'low' state, as shown in FIG. 4 . The heating point determining member 135 can sense that a current is flowing in the heating wire member 110 corresponding to the 'starting end of the heating wire'.

The second photocoupler member 134 may be serially connected to a heat-sensitive wire member (hereinafter, referred to as a 'thermal wire termination') having a coupler input end opposite to the top end of the heat-sensitive wire as shown in FIG. 4 .

Here, the coupler output end of the second photocoupler member 134 may also be connected to the heating point determining member 135 as shown in FIG. 4 .

That is, the heating point determination member 135 may be connected to the coupler output terminals of the first photocoupler member 133 and the second photocoupler member 134 as shown in FIG. 4 .

And, the heating point determining member 135 is based on the combination of the coupler output terminal of the first photocoupler member 133 and the coupler output terminal of the second photocoupler member 134 at the heat-sensitive wire member 110 and the heat detection target position. heat generation can be detected.

In addition, the heating point determining member 135 distinguishes the heat generation location from among the heat-sensitive wire member 110 or the heat sensing target location based on the voltage V ₀ and the current value I _OHC at both ends of the heat-sensitive wire member 110 . can be configured to

In detail, when current flows from the power supplied through the power source member 131 to the heat-sensitive wire member 110 , the heat-sensitive wire member 110 responds to the 'end of the heat-sensitive wire' without any problems such as disconnection or heat generation in the heat-sensitive wire member 110 . When current flows from the heat-sensitive wire member 110 to the heat-sensitive wire member 110 corresponding to the 'end of the heat-sensitive wire', the coupler output terminal of the first photocoupler member 133 becomes "low" as shown in FIG. 4 . In addition to the state, as the coupler output end of the second photocoupler member 134 is also in the 'low' state, the heating point determining member 135 detects that current is smoothly flowing in the entire section of the thermal wire member 110. be able to

As such, when the coupler output end of the first photocoupler member 133 shows a 'low' state and the coupler output end of the second photocoupler member 134 also shows a 'low' state, in 'CASE 1' of [FIG. 5] As shown, the current flows well in the entire section of the heat-sensitive wire member 110, which means that it is in a normal state.

On the other hand, as in 'CASE 4' of [Fig. 5], the coupler output end of the first photocoupler member 133 shows a 'high' state, and the coupler output end of the second photocoupler member 134 also shows a 'high' state. In this case, referring to [FIG. 3], since an OPEN occurred in a certain part of the heat-sensitive wire member 110, no current flows in the heat-sensitive wire member 110 despite the power supplied from the power source member 131. indicates a case where it is not.

And, 'CASE 3' of [FIG. 5] is theoretically set as one example, the coupler output terminal of the first photocoupler member 133 indicates a 'high' state, and the coupler output terminal of the second photocoupler member 134 is shown. A case showing a 'low' state also represents an impossible case that does not occur.

'CASE 2' of [FIG. 5] is a case in which the coupler output terminal of the first photocoupler member 133 indicates a 'low' state and the coupler output terminal of the second photocoupler member 134 indicates a 'high' state [Fig. 3], it indicates that a phenomenon (SHORT) in which two heat-sensitive wires stick to each other due to heat is generated in a certain part of the heat-sensitive wire member 110 .

An object of the present invention is to accurately determine where the short occurred when the situation of 'CASE 2' of [FIG. 5] occurred.

On the other hand, the contact resistance member (140; R _JB ) corresponds between the power source member 131 and the heat sensing switch member (121, 121') as in [Fig. 3] and [Fig. 6] to [Fig. 7]. and may be connected in parallel to the heat-sensitive wire member 110 .

As a result, the contact resistance member 140 (R _JB ) interlocks with the switching operation of the heat sensing switch members 121 and 121 ′ as shown in FIGS. 3 and 6 to 7 , and the heat-sensitive wire member ( As the resistance value R ₀ applied to both ends of the 110 is changed, as a result, the voltage V ₀ and the current value I _OHC of the heat-sensitive wire member 110 are changed.

And, the contact resistance member 140 (R _JB ) preferably has a resistance value greater than the total resistance value (R _{OHC_TOTAL} ) of the heat-sensitive wire member 110 with reference to [ FIG. 3 ] R _JB > 2×R _{OHC_TOTAL} can be composed of

Here, referring to [Fig. 3], 'R _{OHC_TOTAL} ' is the total resistance value of the heat-sensitive wire member 110, and the heat-sensitive wire member 110 includes the inverter 10, the extension cable 30, the track cable 20, and the extension. It means a total resistance value corresponding to the total length of the cable 30 sequentially arranged via the cable 30 .

That is, it means a nominal resistance value that can be obtained when the resistance value is measured only for the heat-sensitive wire member 110 after the heat-sensitive wire member 110 is installed in the field.

'R _OHC ' is the resistance value of the heat-sensitive wire member 110, and the heat-sensitive wire member 110 sequentially passes through the inverter 10, the extension cable 30, the track cable 20, and the extension cable 30. It is similar to 'R _{OHC_TOTAL} ' in that it is the resistance value of the heat-sensitive wire member 110 that becomes In this case, the resistance value (R _OHC ) from the 'start end of the heating wire' to the 'SHORT' point in [FIG. 3] _{is the pure resistance value (R OHC )} becomes this

However, as shown in FIG. 3 , in a state in which the heat-sensitive wire member 110 is installed, the resistance value R ₀ applied to both ends of the heat-sensitive wire member 110 may be measured.

Referring to FIG. 3 , the resistance value R ₀ applied to both ends of the heat-sensitive wire member 110 may be expressed by the formula R _O = R _JB × R _OHC / (R _JB + R _OHC ) .

And, referring to [FIG. 3], the resistance value R ₀ applied to both ends of the heat-sensitive wire member 110 may be expressed by the formula R _O = V ₀ / I _OHC .

Also, referring to FIG. 3 , the current value R ₀ flowing through both ends of the heat-sensitive wire member 110 may be expressed by the formula I _OHC = (V _S - V _O ) / R _LIMIT .

Considering the above, if R _O < R _{OHC_TOTAL} + 'maximum measurement error' , the heating point determining member 135 is a heat-sensitive wire at a position corresponding to the track cable 20 as in [Fig. 3]. It may be configured to determine that a short circuit has occurred due to heat generation in the member 110 .

At this time, when the heating point determining member 135 determines that a short circuit has occurred due to heat generation in the heating wire member 110 at a position corresponding to the track cable 20 as shown in FIG. 3 , the heating point determining member 135 ) may be configured to determine at which point in the track cable 20 heat is generated by _{dividing the 'ROHC} ' value by the resistance value per unit distance of the heat-sensitive wire member 110 (a known set value).

And, if R _O > R _{OHC_TOTAL} + 'maximum measurement error' , the heating point determination member 135 is configured to determine that heat has occurred at a position corresponding to the junction box 50 as shown in FIG. 3 . can be

Here, the reason for providing the 'maximum measurement error' margin is that the resistance R _O measured at both ends of the heat-sensitive wire member 110 is actually slightly less than the total resistance R _{OHC_TOTAL} of the heat-sensitive wire member 110 . It can be seen that this is to eliminate a small but large error, and the resistance R _O measured at both ends of the heat-sensitive wire member 110 is actually slightly less than the total resistance R _{OHC_TOTAL} of the heat-sensitive wire member 110 . It can be seen as a way to eliminate errors that can be said to be large but small.

10: inverter
20: track cable
21: cable core wire
30: extension cable
31: cable core wire
41: core wire connector
50: junction box
110: heat-sensitive wire member
111: heat-sensitive wire junction member
120, 120': temperature sensing contact member
121, 121': No heat detection switch
130: heat sensing control material
131: no power source
132: current limiting resistance member
133: first photocoupler member
134: second photocoupler member
135: absence of heat point determination
140: contact resistance member
r: discriminant resistance
r' : pull-up resistor

Claims (4)

Whether heat is generated in a wireless power transmission system comprising an inverter, a track cable receiving power from the inverter, an extension cable connecting the inverter and the track cable, and a junction box connecting the extension cable and the track cable As a heat detection system of a wireless power track that monitors
a thermal wire member 110 disposed sequentially via the inverter, the extension cable, and the track cable;
a temperature sensing contact member 120 connected to the heating wire member and switched on/off in response to the temperature of the heat sensing target position, each disposed at one or more preset heat sensing target positions;
The heat-sensing member and the heat-sensing object are monitored by monitoring the voltage (V ₀ ) and the current value (I _OHC ) at both ends of the heat-sensing member, which is electrically connected to the heat-sensing member and responds to a switching operation of the temperature-sensing contact member. Heat detection control member 130 configured to distinguish and detect the generation of heat at the location;
consists of,
The heat sensing control member 130,
a power source member 131 mounted at a predetermined position of the heat-sensitive wire member close to the inverter to supply power to the heat-sensitive wire member;
a current limiting resistance member 132 connected in series to the heat-sensitive wire member close to the inverter;
a first photocoupler member 133 having a coupler input terminal connected in series to a heat-sensitive wire member (hereinafter, referred to as a 'thermal wire starting end') adjacent to the power source member;
a second photocoupler member 134 having a coupler input end connected in series to a heat-sensitive wire member (hereinafter, referred to as a 'thermal wire termination') opposite to a starting end of the heat-sensitive wire;
The heat-sensitive wire member and the heat-sensitive wire member connected to the coupler output ends of the first photocoupler member and the second photocoupler member based on a combination of the coupler output end of the first photocoupler member and the coupler output end of the second photocoupler member Detects generation of heat at a location to be sensed, and divides the location of heat generation among the location of the heat-sensitive member or the location to be detected based on the voltage (V ₀ ) and current value (I _OHC ) at both ends of the heat-sensitive wire member a heating point determining member 135;
Heat detection system of the wireless power track, characterized in that it comprises a.
delete The method according to claim 1,
The temperature sensing contact member 120,
a heat-sensing switch member 121 connected in series to the heat-sensing wire member and switched on and off in response to the temperature of the heat-sensing target position, maintaining a normally switched-on state and switched off in a heat-generating environment;
to provide
The voltage (V ₀ ) and current value at both ends of the heat-sensing member is connected in parallel to the heat-sensing member between the power source member and the heat-sensing switch member and interlocks with the switching operation of the heat-sensing switch member 121 . (I _OHC ) Contact resistance member 140 to change;
Heat detection system of the wireless power track, characterized in that it further comprises a.
4. The method according to claim 3,
The contact resistance member 140 is configured to have a resistance value greater than a total resistance value of the heat-sensitive wire member.

Images