Power conversion system, power module and control module

Abstract

This electric power conversion system 1 comprises a plurality of power modules 100 and a control module. The control module has an electric current source 230 that supplies a switch-driving electric current, and a main switch 240 that cuts off the switch-driving electric current from the electric current source 230 in response to a detection of an external abnormality. Each of the plurality of power modules 100 has an electric power conversion circuit 110, a power-off switch 140 that resumes an output of the electric power conversion circuit 110 when an input from the switch-driving electric current is received and stops the output of the electric power conversion switch when the input from the switch-driving electric current has stopped, and an input cutoff switch 150 that cuts off the input of the switch-driving electric current to the power-off switch 140 in response to a detection of an internal abnormality. The electric current source 230, the main switch 240, and the power-off switches 140 and the input cutoff switches 150 of the plurality of power modules 100 are serially connected.

Description

[Technical Field]

[0001] The present disclosure relates to a power conversion system, a power module, and a control module. [Background technology]

[0002] Patent Document 1 discloses a system in which a plurality of drive circuits are monitored by a single controller. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-101459 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a power conversion system that is effective in achieving both reliable simultaneous shutdown of a plurality of power modules and simplification of the system configuration. [Means for solving the problem]

[0005] A power conversion system according to one aspect of the present disclosure includes a plurality of power modules that output electric power, and a control module that controls the plurality of power modules. The control module has a current source that supplies a switch drive current, and a main switch that cuts off the switch drive current from the current source in response to detection of an external abnormality. Each of the plurality of power modules has a power conversion circuit that outputs electric power, a power-off switch that continues the output of the power conversion circuit when there is an input of the switch drive current and stops the output of the power conversion circuit when the input of the switch drive current stops, and an input cut-off switch that cuts off the input of the switch drive current to the power-off switch in response to detection of an internal abnormality. The current source, the main switch, and the power-off switches and input cut-off switches of the plurality of power modules are connected in series.

[0006] A power module according to another aspect of the present disclosure includes a power conversion circuit controlled by a control module and outputting power, a power-off switch that continues output from the power conversion circuit when a switch drive current is input from the control module and stops output from the power conversion circuit when the control module stops input of the switch drive current, and an input cut-off switch that cuts off input of the switch drive current to the power-off switch in response to detection of an internal abnormality.

[0007] A control module according to yet another aspect of this release is a control module that controls a plurality of power modules that output electric power, and includes a current source that supplies a constant switch drive current, and a main switch that cuts off the switch drive current from the current source in response to detection of an external abnormality, and each of the plurality of power modules includes a power conversion circuit that outputs electric power, a power-off switch that continues the output of the power conversion circuit when there is an input of the switch drive current and stops the output of the power conversion circuit in response to detection of an internal abnormality, and an input cut-off switch that cuts off the input of the switch drive current to the power-off switch in response to detection of an internal abnormality, and the current source and the main switch are connected in series with the power-off switches and input cut-off switches of the plurality of power modules. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a power conversion system that is effective in achieving both reliable simultaneous shutdown of a plurality of power modules and simplification of the system configuration. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram illustrating a configuration of a power conversion system. [Figure 2] FIG. 10 is a block diagram illustrating an output stopping system configured by a first daisy chain. [Figure 3]FIG. 10 is a block diagram illustrating an output stopping system configured by a first daisy chain. [Figure 4] FIG. 10 is a block diagram illustrating an output stopping system configured by a second daisy chain. [Figure 5] FIG. 10 is a block diagram illustrating an example of an output stopping system configured via a secondary control module. [Figure 6] FIG. 10 is a block diagram illustrating an example of an output stopping system configured via a secondary control module. [Figure 7] FIG. 10 is a diagram showing a modified example of the control module. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, the embodiments will be described in detail with reference to the drawings. In the description, the same elements or elements having the same functions are denoted by the same reference numerals, and redundant description will be omitted.

[0011] [Power Conversion System] The power conversion system 1 shown in FIG. 1 is a system that supplies power generated by multiple power modules to one or more loads. FIG. 1 illustrates a parallel multiplexed power conversion system 1 that combines power generated by multiple power modules and supplies the combined power to the same load. The power conversion system 1 may also be a system that individually supplies power generated by multiple power modules to multiple loads. A specific example of a load is a motor, but is not limited to this. The load may be anything as long as it functions when supplied with power.

[0012] The power conversion system 1 includes a plurality of power modules 100 and a control module 200. Each of the plurality of power modules 100 outputs electric power to a load. The control module 200 controls the plurality of power modules 100.

[0013] For example, the control module 200 may be a master controller that outputs a single command to multiple power modules 100 so that they share the power output to a single load, or it may be a programmable logic controller that outputs individual commands to multiple power modules 100 based on a predetermined sequence.

[0014] For example, the control module 200 includes a main control circuit 210. The main control circuit 210 performs calculations to control the plurality of power modules 100. When the control module 200 is a master controller, the main control circuit 210 performs calculations based on feedback signals from the plurality of power modules 100. Te1 and transmits the generated output commands to the plurality of power modules 100.

[0015] When the control module 200 is a programmable logic controller, the main control circuit 210 generates a plurality of output commands corresponding to the plurality of power modules 100, respectively, based on a predetermined sequence, and transmits each of the plurality of output commands to the corresponding power module 100.

[0016] Each of the multiple power modules 100 has a power conversion circuit 110 and a local control circuit 120. The power conversion circuit 110 performs power conversion between a power supply side (primary side) and a load side (secondary side). Each of the primary side power and the secondary side power may be DC power or AC power.

[0017] 1 illustrates a power conversion circuit 110 in which the primary-side power is DC power and the secondary-side power is three-phase AC power. For example, the power conversion circuit 110 includes DC buses 111P and 111N, a smoothing capacitor 112, an inverter circuit 113, output lines 115U, 115V, and 115W, and a current sensor 116. The DC buses 111P and 111N supply DC power on the primary side. The smoothing capacitor 112 smoothes the DC voltage on the DC buses 111P and 111N. The output lines 115U, 115V, and 115W supply three-phase AC power on the secondary side.

[0018] The inverter circuit 113 generates three-phase AC power on the secondary side to which the output lines 115U, 115V, and 115W are connected by switching the connection state between the DC buses 111P and 111N and the output lines 115U, 115V, and 115W using multiple switching elements 114. The current sensor 116 detects the current in each of the output lines 115U, 115V, and 115W. The current sensor 116 may be configured to detect the current in each of the output lines 115U, 115V, and 115W, or may be configured to detect the current in any two phases of the output lines 115U, 115V, and 115W. Assuming that the sum of the three-phase AC currents is zero, it is possible to detect the current in the remaining phase based on the currents in the two phases.

[0019] The local control circuit 120 controls the power conversion circuit 110 so as to generate, on the secondary side, power corresponding to the output command received from the main control circuit 210. For example, the local control circuit 120 calculates the on / off timing of the multiple switching elements 114 so as to generate power corresponding to the output command, and switches the multiple switching elements 114 on and off based on the calculation result.

[0020] The power conversion system 1 may be configured to connect a plurality of power modules 100 to the control module 200 by a daisy chain. For example, the control module 200 has a first connector 221, and the power module 100 has a first connector 131 and a second connector 132. A predetermined upper limit number (for example, three) of power modules 100 can be connected to the first connector 221 by the daisy chain. A daisy chain refers to a connection configuration in which three or more devices, not limited to communication circuits, are connected in a single line (so-called daisy chain).

[0021] The plurality of power modules 100 connected to the first connector 221 、1 The power module 100 includes a direct connection module 101 and one or more indirect connection modules 102. A first connector 131 of the direct connection module 101 is connected to a first connector 221 by a cable harness 300. The cable harness 300 has a connector 311 connected to the first connector 221, a connector 312 connected to the first connector 131 of the power module 100, and a cable 320 connecting the connector 311 and the connector 312.

[0022] The first connector 131 of the indirect connection module 102 is connected to the second connector 132 of another power module 100 (the direct connection module 101 or the indirect connection module 102) by a cable harness 400. For example, the first connector 131 of the second indirect connection module 102 from the first connector 221 is connected to the second connector 132 of the direct connection module 101 by the cable harness 400. The first connectors 131 of the third and subsequent indirect connection modules 102 from the first connector 221 are connected to the second connector 132 of the indirect connection module 102 by the cable harness 400.

[0023] In each of the multiple power modules 100, the first connector 131 and the second connector 132 are connected to each other. Therefore, the indirectly connected module 102 is connected to the first connector 221 via the cable harness 300 and one or more cable harnesses 400.

[0024] The control module 200 may be configured to be connected to a plurality of power modules 100 via a plurality of daisy chains. For example, the control module 200 further has a second connector 222 in addition to a first connector 221. A predetermined first upper limit number (e.g., three) of power modules 100 can be connected to the first connector 221 via the first daisy chain. A predetermined second upper limit number (e.g., three) of power modules 100 can be connected to the second connector 222 via a second daisy chain separate from the first daisy chain.

[0025] The plurality of power modules 100 connected to the second connector 222 、1 The power module 100 includes a direct connection module 101 and one or more indirect connection modules 102. A first connector 131 of the direct connection module 101 is connected to a second connector 222 by a cable harness 300. A first connector 131 of the indirect connection module 102 is connected to a second connector 132 of another power module 100 (the direct connection module 101 or the indirect connection module 102) by a cable harness 400.

[0026] The power conversion system 1 may include multiple control modules 200 connected to multiple power modules 100. For example, the power conversion system 1 may include two control modules 200. The two control modules 200 may include a primary control module 200A and a secondary control module 200B. The multiple power modules 100 may include one or more primary power modules 100A connected to the primary control module 200A and one or more secondary power modules 100B connected to the secondary control module 200B. The one or more primary power modules 100A are controlled by the primary control module 200A, and the one or more secondary power modules 100B are controlled by the primary control module 200A via the secondary control module 200B. For example, the primary control module 200A transmits an output command to the primary power module 100A and the secondary control module 200B, and the secondary control module 200B controls the one or more secondary power modules 100B based on the output command received from the primary control module 200A. Secondary control module 200B may control one or more secondary power modules 100B based on an output command that is different from the output command that primary control module 200A outputs to primary power module 100A.

[0027] The primary control module 200A and the secondary control module 200B are connected to each other. For example, each of the primary control module 200A and the secondary control module 200B further includes a third connector 223 in addition to the first connector 221 and the second connector 222. The third connector 223 of the secondary control module 200B is connected to the third connector 223 of the primary control module 200A by a cable harness 500. The cable harness 500 includes a connector 511 connected to the third connector 223 of the primary control module 200A, a connector 512 connected to the third connector 223 of the secondary control module 200B, and a cable 520 connecting the connectors 511 and 512.

[0028] With the above configuration, in the power conversion system 1, one control module 200 (for example, primary control module 200A) can centrally control multiple power modules 100. Here, the power conversion system is required to have a function to stop the output of power with high reliability when an abnormality occurs.

[0029] When an output stop function is incorporated into a system in which a single control module 200 controls multiple power modules 100, it is necessary to collectively stop the power output from the multiple power modules 100 when an abnormality occurs. To collectively stop the power output from the multiple power modules 100, the system configuration can become complicated. In response to this, as shown in FIG. 2 , the control module 200 further includes a current source 230 and a main switch 240. The current source 230 supplies a switch drive current. The main switch 240 cuts off the switch drive current from the current source 230 in response to detection of an external abnormality. The power module 100 further includes a power-off switch 140 and an input cutoff switch 150. The power-off switch 140 continues the output of the power conversion circuit 110 when a switch drive current is input, and stops the output of the power conversion circuit 110 when the input of the switch drive current is stopped. The input cutoff switch 150 cuts off the input of the switch drive current to the power-off switch 140 in response to detection of an internal abnormality. The current source 230, the main switch 240, the power-off switches 140 and the input cutoff switches 150 of the multiple power modules 100 are connected in series.

[0030] A simple configuration in which a current source 230, a main switch 240, and the power-off switches 140 and input cutoff switches 150 of the multiple power modules 100 are connected in series allows the multiple power modules 100 to be stopped collectively with high reliability. For example, if an external abnormality occurs, the main switch 240 can cut off the switch drive current to the multiple power modules 100, thereby stopping the output of the multiple power modules 100 collectively. If an internal abnormality occurs in any of the multiple power modules 100, the input cutoff switch 150 can cut off the switch drive current to the multiple power modules 100, thereby stopping the output of the multiple power modules 100 collectively. Therefore, this power conversion system 1 is effective in achieving both reliable collectively stopping of the multiple power modules 100 and system simplification. The configuration for collectively stopping the multiple power modules 100 will be described in more detail below.

[0031] 2 and 3 illustrate an output stopping system configured by a first daisy chain. As an example, in the illustrated first daisy chain, three power modules 100 are connected to a first connector 221. As shown in FIG. 2, a current source 230 has a positive terminal 231 and a negative terminal 232, and supplies a switch drive current to a circuit connected to the positive terminal 231 and the negative terminal 232. The current source 230 may be a constant current source that supplies a constant switch drive current. Supplying a constant switch drive current means supplying a switch drive current maintained near a constant target current. Supplying a switch drive current in a state in which there is a deviation between the switch drive current and the target current that is allowable for control is included in supplying a constant switch drive current. The same applies hereinafter.

[0032] The main switch 240 includes a pair of input terminals 241P, 241N and a pair of output terminals 242P, 242N. The pair of output terminals 242P, 242N are maintained in a mutually conductive state by current input to the pair of input terminals 241P, 241N, and are disconnected from each other when the current input to the pair of input terminals 241P, 241N stops. For example, the main switch 240 is a photocoupler and further includes a light-emitting element 243 and a light-receiving element 244. The light-emitting element 243 emits light in response to current input to the pair of input terminals 241P, 241N. The light-receiving element 244 is provided between the pair of output terminals 242P, 242N, and maintains the pair of output terminals 242P, 242N in a mutually conductive state when the light-emitting element 243 is emitting light, and disconnects the pair of output terminals 242P, 242N from each other when the light-emitting element 243 stops emitting light. The pair of output terminals 242P, 242N are connected in series to the current source 230. For example, the output terminal 242P is connected to the positive electrode 231 of the current source 230, and the output terminal 242N is connected to the first connector 221.

[0033] A pair of input terminals 241P, 241 N is connected to the first sensor 11. The first sensor 11 is a sensor that detects an external abnormality. The external abnormality means an abnormality that occurs outside the power conversion system 1. For example, the first sensor 11 is an object sensor that detects the intrusion of an object (including a human body) into a predetermined area as an external abnormality. When the first sensor 11 does not detect an external abnormality, the input terminals 241P, 241 When an external abnormality is detected, the ON current is input to N. 241 Therefore, the main switch 240 cuts off the switch drive current from the current source 230 in response to the detection of an external abnormality.

[0034] The power-off switch 140 includes a pair of power-off input terminals 141P, 141N and a pair of power-off output terminals 142P, 142N. The pair of power-off output terminals 142P, 142N are maintained in a mutually conductive state by current input to the pair of power-off input terminals 141P, 141N, and are disconnected from each other in response to the current input to the pair of power-off input terminals 141P, 141N being stopped. For example, the power-off switch 140 is a photocoupler, and further includes a light-emitting element 143 and a light-receiving element 144. The light-emitting element 143 emits light in response to current input to the pair of power-off input terminals 141P, 141N. The light receiving element 144 is provided between the pair of power-off output terminals 142P, 142N, and maintains the pair of power-off output terminals 142P, 142N in a mutually conductive state when the light emitting element 143 is emitting light, and disconnects the pair of power-off output terminals 142P, 142N from each other in response to the stop of light emission of the light emitting element 143. In the series connection of the current source 230, the main switch 240, and the power-off switches 140 and input disconnection switches 150 of the multiple power modules 100, the pair of power-off input terminals 141P, 141N are connected to the main switch 240.

[0035] The pair of power-off output terminals 142P, 142N are connected to the local control circuit 120. The local control circuit 120 includes a power-off circuit 121. The power-off circuit 121 stops output from the power conversion circuit 110 when the pair of power-off output terminals 142P, 142N are disconnected from each other. For example, when the pair of power-off output terminals 142P, 142N are disconnected from each other, the power-off circuit 121 turns off all of the switching elements 114 of the inverter circuit 113 and disconnects the output lines 115U, 115V, 115W from the DC buses 111P, 111N. For example, the power-off circuit 121 may be configured to cut off power to the drive circuits of the switching elements 114 when the pair of power-off output terminals 142P, 142N are disconnected from each other. When the switching element 114 is driven by a drive signal from a buffer IC that buffers the drive signal, the power-off circuit 121 may be configured to disconnect the switching element 114 from the buffer IC by disconnecting the pair of power-off output terminals 142P, 142N. Alternatively, the power-off circuit 121 may be configured to disconnect both the power supply and the buffer IC by disconnecting the pair of power-off output terminals 142P, 142N. In this manner, the pair of power-off input terminals 141P, 141N are connected to the main switch 240, and the power-off output terminals 142P, 142N are connected to the local control circuit 120. Therefore, the power-off switch 140 continues output from the power conversion circuit 110 when a switch drive current is input, and stops output from the power conversion circuit 110 when the input of the switch drive current is stopped.

[0036] The input cutoff switch 150 includes a pair of cutoff input terminals 151P, 151N and a pair of cutoff output terminals 152P, 152N. The pair of cutoff output terminals 152P, 152N are maintained in a mutually conductive state by current input to the pair of cutoff input terminals 151P, 151N and are cut off from each other when the current input to the pair of cutoff input terminals 151P, 151N stops. For example, the input cutoff switch 150 is a photocoupler and further includes a light-emitting element 153 and a light-receiving element 154. The light-emitting element 153 emits light in response to current input to the pair of cutoff input terminals 151P, 151N. The light-receiving element 154 is provided between the pair of cutoff output terminals 152P, 152N. When the light-emitting element 153 emits light, the light-receiving element 154 maintains the pair of cutoff output terminals 152P, 152N in a mutually conductive state and cuts off the pair of cutoff output terminals 152P, 152N from each other when the light-emitting element 153 stops emitting light. In the series connection of the current source 230, the main switch 240, the power-off switches 140 and the input cutoff switches 150 of the multiple power modules 100, a pair of power-off input terminals 141P, 141N and a pair of cutoff output terminals 152P, 152N are connected in series.

[0037] The pair of shutoff input terminals 151P, 151N are connected to the local control circuit 120. The local control circuit 120 includes an internal diagnostic circuit 122. The internal diagnostic circuit 122 inputs an on-current to the pair of shutoff input terminals 151P, 151N of the input cutoff switch 150, and stops the input of the on-current in response to detection of an internal abnormality. The internal abnormality refers to an abnormality that occurs inside the power conversion system 1. In this way, the pair of power-off input terminals 141P, 141N and the pair of shutoff output terminals 152P, 152N are connected in series, and the shutoff input terminals 151P, 151N are connected to the local control circuit 120, so that the input cutoff switch 150 cuts off the input of the switch drive current to the power-off switch 140 in response to detection of an internal abnormality.

[0038] The power conversion system 1 may further include a second output stopping system in addition to a first output stopping system configured by a series connection of a current source 230, a main switch 240, and power-off switches 140 and input cutoff switches 150 of multiple power modules 100.

[0039] For example, the control module 200 further includes a second current source 250 and a second main switch 260. The second current source 250 supplies a switch drive current. The second main switch 260 cuts off the switch drive current from the second current source 250 in response to detection of an external abnormality. The power module 100 further includes a second power-off switch 160 and a second input cut-off switch 170. The second power-off switch 160 continues output from the power conversion circuit 110 when a switch drive current is input, and stops the output of the power conversion circuit 110 when the input of the switch drive current stops. The second input cut-off switch 170 cuts off the input of the switch drive current to the second power-off switch 160 in response to detection of an internal abnormality. The second current source 250, the second main switch 260, and the second power-off switches 160 and second input cut-off switches 170 of the multiple power modules 100 are connected in series. This forms the second output stop system described above.

[0040] Similar to the current source 230, the second current source 250 has a positive terminal 251 and a negative terminal 252, and supplies a second switch drive current to a circuit connected to the positive terminal 251 and the negative terminal 252. The second current source 250 may be a constant current source that supplies a constant second switch drive current.

[0041] Similar to the main switch 240, the second main switch 260 includes a pair of input terminals 261P, 261N and a pair of output terminals 262P, 262N. The pair of output terminals 262P, 262N are maintained in a mutually conductive state by current input to the pair of input terminals 261P, 261N, and are disconnected from each other in response to the current input to the pair of input terminals 261P, 261N being stopped. For example, the second main switch 260 is a photocoupler, and further includes a light-emitting element 263 and a light-receiving element 264. The light-emitting element 263 emits light in response to current input to the pair of input terminals 261P, 261N. The light receiving element 264 is provided between the pair of output terminals 262P, 262N, and maintains the pair of output terminals 262P, 262N in a mutually conductive state when the light emitting element 263 is emitting light, and disconnects the pair of output terminals 262P, 262N from each other in response to the stop of light emission of the light emitting element 263. The pair of output terminals 262P, 262N are connected in series to the second current source 250. For example, the output terminal 262P is connected to the positive electrode 251 of the second current source 250, and the output terminal 262N is connected to the first connector 221.

[0042] A pair of input terminals 261P, 261 N is connected to the second sensor 12. The second sensor 12 is a sensor that detects an external abnormality. For example, the second sensor 12 is an object sensor that detects the intrusion of an object (including a human body) into the above-mentioned predetermined area as an external abnormality. Therefore, the second sensor 12 detects the same external abnormality as the external abnormality detected by the first sensor 11. When the second sensor 12 does not detect an external abnormality, the input terminals 261P, 261 When an external abnormality is detected, the ON current is input to N. 261 Therefore, the second main switch 260 cuts off the switch drive current from the second current source 250 in response to the detection of an external abnormality.

[0043] Similar to the power-off switch 140, the second power-off switch 160 includes a pair of power-off input terminals 161P, 161N and a pair of power-off output terminals 162P, 162N. The pair of power-off output terminals 162P, 162N are maintained in a mutually conductive state by current input to the pair of power-off input terminals 161P, 161N, and are disconnected from each other in response to the current input to the pair of power-off input terminals 161P, 161N being stopped. For example, the second power-off switch 160 is a photocoupler, and further includes a light-emitting element 163 and a light-receiving element 164. The light-emitting element 163 emits light in response to current input to the pair of power-off input terminals 161P, 161N. The light receiving element 164 is provided between the pair of power-off output terminals 162P, 162N, and maintains the pair of power-off output terminals 162P, 162N in a mutually conductive state when the light emitting element 163 is emitting light, and disconnects the pair of power-off output terminals 162P, 162N from each other in response to the stop of light emission of the light emitting element 163. In the series connection of the second current source 250, the second main switch 260, and the second power-off switches 160 and second input disconnection switches 170 of the multiple power modules 100, the pair of power-off input terminals 161P, 161N are connected to the second main switch 260.

[0044] The pair of power-off output terminals 162P, 162N are connected to the local control circuit 120. The power-off circuit 121 also stops the output from the power conversion circuit 110 when the pair of power-off output terminals 162P, 162N are disconnected from each other. For example, when the pair of power-off output terminals 162P, 162N are disconnected from each other, the power-off circuit 121 turns off all of the switching elements 114 of the inverter circuit 113 and disconnects the output lines 115U, 115V, 115W from the DC buses 111P, 111N. In this way, since the pair of power-off input terminals 161P, 161N are connected to the second main switch 260 and the power-off output terminals 162P, 162N are connected to the local control circuit 120, the second power-off switch 160 continues the output of the power conversion circuit 110 when a second switch drive current is input and stops the output of the power conversion circuit 110 when the input of the second switch drive current is stopped.

[0045] The second input cutoff switch 170 includes a pair of cutoff input terminals 171P, 171N and a pair of cutoff output terminals 172P, 172N. The pair of cutoff output terminals 172P, 172N are maintained in a mutually conductive state by current input to the pair of cutoff input terminals 171P, 171N, and are cut off from each other in response to the current input to the pair of cutoff input terminals 171P, 171N being stopped. For example, the second input cutoff switch 170 is a photocoupler, and further includes a light-emitting element 173 and a light-receiving element 174. The light-emitting element 173 emits light in response to current input to the pair of cutoff input terminals 171P, 171N. The light receiving element 174 is provided between the pair of cutoff output terminals 172P, 172N, and maintains the pair of cutoff output terminals 172P, 172N in a mutually conductive state when the light emitting element 173 is emitting light, and cuts off the pair of cutoff output terminals 172P, 172N from each other in response to the stop of light emission of the light emitting element 173. In the series connection of the second current source 250, the second main switch 260, the second power-off switches 160 and the second input cutoff switches 170 of the multiple power modules 100, the pair of power-off input terminals 161P, 161N and the pair of cutoff output terminals 172P, 172N are connected in series.

[0046] The pair of shutoff input terminals 171P, 171N are connected to the local control circuit 120. The internal diagnostic circuit 122 inputs an ON current to the pair of shutoff input terminals 171P, 171N of the second input shutoff switch 170, and stops the input of the ON current in response to detection of an internal abnormality. In this way, the pair of power-off input terminals 161P, 161N and the pair of shutoff output terminals 172P, 172N are connected in series, and the shutoff input terminals 171P, 171N are connected to the local control circuit 120, so that the second input shutoff switch 170 cuts off the input of the switch drive current to the second power-off switch 160 in response to detection of an internal abnormality.

[0047] In this way, when the power conversion system 1 has the first output stopping system and the second output stopping system, the internal diagnostic circuit 122 detects the status of the power-off switch 140 of the first output stopping system and the status of the power-off switch 140 of the second output stopping system. Stop The presence or absence of an internal abnormality may be diagnosed based on a comparison with the status of the second power-off switch 160 of the corresponding system. As described above, the first sensor 11 and the second sensor 12 detect the same external abnormality. Therefore, it is assumed that the status of the power-off switch 140 and the status of the second power-off switch 160 will always be the same. Therefore, the internal diagnostic circuit 122 diagnoses that there is no internal abnormality when the status of the power-off switch 140 and the status of the second power-off switch 160 are the same, and diagnoses that there is an internal abnormality when the status of the power-off switch 140 and the status of the second power-off switch 160 are different. For example, the internal diagnostic circuit 122 diagnoses that there is an internal abnormality when the power-off output terminals 142P and 142N are conductive but the power-off output terminals 162P and 162N are disconnected from each other, or when the power-off output terminals 142P and 142N are disconnected from each other but the power-off output terminals 162P and 162N are conductive.

[0048] If an internal abnormality is detected, the internal diagnostic circuit 122 stops the input of the ON current to the cutoff input terminals 151P and 151N, and also stops the input of the ON current to the cutoff input terminals 171P and 171N. Therefore, if the internal diagnostic circuit 122 diagnoses that there is an internal abnormality, the input cutoff switch 150 cuts off the input of the switch drive current to the power-off switch 140, and the second input cutoff switch 170 cuts off the input of the switch drive current to the second power-off switch 160.

[0049] The power conversion system 1 may be configured such that the power-off switches 140 and the input cutoff switches 150 of the multiple power modules 100 connected to the first connector 221 are connected in series to the current source 230 and the main switch 240 by the first daisy chain. The power conversion system 1 may also be configured such that the second power-off switches 160 and the second input cutoff switches 170 of the multiple power modules 100 connected to the first connector 221 are connected in series to the second current source 250 and the second main switch 260 by the first daisy chain. For example, in each of the multiple power modules 100, the first connector 131 is connected to the power-off input terminal 141P and the power-off input terminal 161P, and the second connector 132 is connected to the cutoff output terminal 152N and the cutoff output terminal 172N. Each of the multiple power modules 100 further includes a feedback line 133 and a second feedback line 134. The feedback line 133 feeds back the switch drive current from the second connector 132 to the first connector 131. The second feedback line 134 feeds back the second switch drive current from the second connector 132 to the first connector 131.

[0050] As described above, the first connector 131 of the direct connection module 101 is connected to the first connector 221 by the cable harness 300. The cable harness 300 has electric wires 321, 322, 323, and 324. The electric wire 321 sends a switch drive current from the first connector 221 to the first connector 131, and the electric wire 322 returns the switch drive current from the first connector 131 to the first connector 221. The electric wire 321 is connected to the output terminal 242N of the main switch 240 by the connection between the connector 311 and the first connector 221, and is connected to the power-off input terminal 141P of the power-off switch 140 by the connection between the connector 312 and the first connector 131. Therefore, the first connector 131 receives the switch drive current. The electric wire 322 is connected to the negative electrode 232 of the current source 230 by connecting the connector 311 and the first connector 221 , and is connected to the feedback line 133 by connecting the connector 312 and the first connector 131 .

[0051] The electric wire 323 sends the second switch drive current from the first connector 221 to the first connector 131, and the electric wire 324 returns the second switch drive current from the first connector 131 to the first connector 221. The electric wire 323 is connected to the output terminal 262N of the second main switch 260 by the connection between the connector 311 and the first connector 221, and is connected to the power-off input terminal 161P of the second power-off switch 160 by the connection between the connector 312 and the first connector 131. Therefore, the first connector 131 receives the second switch drive current. The electric wire 324 is connected to the negative electrode 252 of the second current source 250 by the connection between the connector 311 and the first connector 221, and is connected to the second feedback line 134 by the connection between the connector 312 and the first connector 131.

[0052] As described above, the first connector 131 of the indirect connection module 102 is connected to the second connector 132 of another power module 100 (the direct connection module 101 or the indirect connection module 102) by the cable harness 400. The cable harness 400 has electric wires 421, 422, 423, and 424. The electric wire 421 sends a switch drive current from the second connector 132 of the other power module 100 to the first connector 131 of the indirect connection module 102, and the electric wire 422 returns the switch drive current from the first connector 131 of the indirect connection module 102 to the second connector 132 of the other power module 100. The electric wire 421 is connected to the cutoff output terminal 152N of the input cutoff switch 150 by the connection between the connector 411 and the second connector 132 of the other power module 100, and is connected to the power-off input terminal 141P of the power-off switch 140 by the connection between the connector 412 and the first connector 131 of the indirect connection module 102. Therefore, the second connector 132 of the other power module 100 outputs the switch drive current that has passed through the power-off switch 140 and the input cutoff switch 150, and the first connector 131 of the indirectly connected module 102 receives the switch drive current that has passed through the other power module 100. The electric wire 422 is connected to the feedback line 133 of the other power module 100 by connecting the connector 411 to the second connector 132 of the other power module 100, and is connected to the feedback line 133 of the indirectly connected module 102 by connecting the connector 412 to the first connector 131 of the indirectly connected module 102.

[0053] The electric wire 423 sends the second switch drive current from the second connector 132 of the other power module 100 to the first connector 131 of the indirectly connected module 102, and the electric wire 424 returns the second switch drive current from the first connector 131 of the indirectly connected module 102 to the second connector 132 of the other power module 100. The electric wire 423 is connected to the cutoff output terminal 172N of the second input cutoff switch 170 by connecting the connector 411 to the second connector 132 of the other power module 100, and is connected to the power-off input terminal 161P of the second power-off switch 160 by connecting the connector 412 to the first connector 131 of the indirectly connected module 102. Therefore, the second connector 132 of the other power module 100 outputs the second switch drive current that has passed through the second power-off switch 160 and the second input cutoff switch 170, and the first connector 131 of the indirectly connected module 102 receives the second switch drive current that has passed through the other power module 100. The electric wire 424 is connected to the second feedback line 134 of the other power module 100 by connecting the connector 411 to the second connector 132 of the other power module 100, and is connected to the second feedback line 134 of the indirectly connected module 102 by connecting the connector 412 to the first connector 131 of the indirectly connected module 102.

[0054] The one or more indirectly connected modules 102 include a termination module 103 that terminates the first daisy chain. The termination module 103 is a module that is not one of the "other power modules 100" described above. A termination connector 190 is connected to the second connector 132 of the termination module 103. The termination connector 190 returns the switch drive current output from the second connector 132 to the feedback line 133 and returns the second switch drive current output from the second connector 132 to the second feedback line 134. For example, the termination connector 190 has a short-circuit line 191 and a second short-circuit line 192. The short-circuit line 191 connects the cutoff output terminal 152N of the input cutoff switch 150 to the feedback line 133 via the second connector 132. The second short-circuit line 192 connects the cutoff output terminal 172N of the second input cutoff switch 170 to the second feedback line 134 via the second connector 132.

[0055] As a result, the current source 230, the main switch 240, and the power-off switches 140 and input cutoff switches 150 of the multiple power modules 100 are connected in series. The power conversion system 1 may be configured so that the power-off switches 140 and input cutoff switches 150 of the multiple power modules 100 connected to the second connector 222 are connected in series to the current source 230 and the main switch 240 by the second daisy chain. The power conversion system 1 may also be configured so that the second power-off switches 160 and second input cutoff switches 170 of the multiple power modules 100 connected to the second connector 222 are connected in series to the second current source 250 and the second main switch 260 by the second daisy chain.

[0056] 2 and 4 illustrate an output stop system configured by a second daisy chain. As shown in FIGS. 2 and 4, a plurality of power modules 100 are connected to the second connector 222 via a cable harness 300 and a cable harness 400. As an example, in the illustrated second daisy chain, two power modules 100 are connected to the second connector 222. Therefore, the second indirectly connected module 102 from the second connector 222 is the terminating module 103. In connecting the plurality of power modules 100 to the second connector 222, the first connector 131 of the direct connected module 101 is connected to the second connector 222 via the cable harness 300. The first connector 131 of the indirectly connected module 102 (the terminating module 103 in the illustration) is connected to the second connector 132 of another power module 100 (the direct connected module 101 in the illustration) via the cable harness 400. The second connector 132 of the terminating module 103 is connected to a terminating connector 190.

[0057] For example, the control module 200 further includes a relay line 271, a feedback line 272, a relay line 274, and a feedback line 275. The relay line 271 outputs the switch drive current returned to the first connector 221 by the electric wire 322 to the electric wire 321 of the cable harness 300 connected to the second connector 222. The feedback line 272 returns the switch drive current returned to the second connector 222 by the electric wire 322 to the negative electrode 232 of the current source 230. This connects the current source 230, the main switch 240, the power-off switch 140 and the input cutoff switch 150 of the power module 100 in the first daisy chain, and the power-off switch 140 and the input cutoff switch 150 of the power module 100 in the second daisy chain in series.

[0058] The relay line 274 outputs the second switch drive current returned to the first connector 221 by the electric wire 324 to the electric wire 323 of the cable harness 300 connected to the second connector 222. The feedback line 275 returns the second switch drive current returned to the second connector 222 by the electric wire 324 to the negative electrode 252 of the second current source 250. This connects the second current source 250, the second main switch 260, the second power-off switch 160 and the second input cut-off switch 170 of the power module 100 in the first daisy chain, and the second power-off switch 160 and the second input cut-off switch 170 of the power module 100 in the second daisy chain in series.

[0059] Furthermore, the power conversion system 1 may be configured such that the power-off switches 140 and the input cutoff switches 150 of the multiple secondary power modules 100B are connected in series with the current source 230, the main switch 240, and the power-off switches 140 and the input cutoff switches 150 of the multiple primary power modules 100A by the secondary control module 200B and the cable harness 500. Furthermore, the power conversion system 1 may be configured such that the second power-off switches 160 and the second input cutoff switches 170 of the multiple secondary power modules 100B are connected in series with the second current source 250, the second main switch 260, and the second power-off switches 160 and the second input cutoff switches 170 of the multiple primary power modules 100A by the secondary control module 200B and the cable harness 500.

[0060] 5 and 6 are block diagrams illustrating an example of an output stopping system configured via the secondary control module 200B. As shown in FIGS. 5 and 6, a cable harness 500 includes electric wires 521, 522, 523, and 524. The electric wire 521 transmits a switch drive current from the third connector 223 of the primary control module 200A to the third connector 223 of the secondary control module 200B, and the electric wire 522 returns the switch drive current from the third connector 223 of the secondary control module 200B to the third connector 223 of the primary control module 200A. The electric wire 523 transmits a second switch drive current from the third connector 223 of the primary control module 200A to the third connector 223 of the secondary control module 200B, and the electric wire 524 returns the second switch drive current from the third connector 223 of the secondary control module 200B to the third connector 223 of the primary control module 200A.

[0061] The primary control module 200A further includes relay lines 273 and 276 in addition to the above-described relay lines 271 and 274. The relay line 273 outputs the switch drive current that has been returned to the second connector 222 via the electric wire 322 to the electric wire 521 of the cable harness 500 connected to the third connector 223. The feedback line 272 feeds back to the negative electrode 232 of the current source 230 the switch drive current that has been returned to the second connector 222 via the electric wire 322, output to the electric wire 521 via the relay line 273, and returned to the third connector 223 via the electric wire 522. The relay line 276 outputs the second switch drive current that has been returned to the second connector 222 via the electric wire 324 to the electric wire 523 of the cable harness 500 connected to the third connector 223. The feedback line 275 returns the second switch drive current, which is returned to the second connector 222 via the electric wire 324, output to the electric wire 523 via the relay line 276, and returned to the third connector 223 via the electric wire 524, to the negative electrode 252 of the second current source 250.

[0062] 6 , in the secondary control module 200B, the current source 230, the main switch 240, the second current source 250, and the second main switch 260 are not connected to the first connector 221. In the first connector 221, the electric wire 321 of the cable harness 300 is connected to the feedback line 272, and the electric wire 323 of the cable harness 300 is connected to the feedback line 275. In the third connector 223, the electric wire 521 is connected to the feedback line 272, and the electric wire 523 is connected to the feedback line 275. The electric wire 522 is connected to the relay line 273, and the electric wire 524 is connected to the relay line 276. Therefore, the switch drive current sent to the secondary control module 200B by the electric wire 521 is output from the first connector 221 to the electric wire 321 of the cable harness 300. The switch drive current returned to the first connector 221 by the electric wire 322 is output to the electric wire 321 of the cable harness 300 connected to the second connector 222 by the relay line 271. The switch drive current returned to the second connector 222 by the electric wire 322 is returned to the electric wire 522 of the cable harness 500 connected to the third connector 223 by the relay line 273.

[0063] The second switch drive current sent to the secondary control module 200B by the electric wire 523 is output from the first connector 221 to the electric wire 323 of the cable harness 300. The second switch drive current returned to the first connector 221 by the electric wire 324 is output by the relay line 274 to the electric wire 323 of the cable harness 300 connected to the second connector 222. The second switch drive current returned to the second connector 222 by the electric wire 324 is returned by the relay line 276 to the electric wire 524 of the cable harness 500 connected to the third connector 223. As described above, the current source 230, the main switch 240, the power-off switches 140 and the input cutoff switches 150 of the plurality of primary power modules 100A, and the power-off switches 140 and the input cutoff switches 150 of the plurality of secondary power modules 100B are connected in series. In addition, a second current source 250, a second main switch 260, the second power-off switches 160 and second input cut-off switches 170 of the multiple primary power modules 100A, and the second power-off switches 160 and second input cut-off switches 170 of the multiple secondary power modules 100B are connected in series.

[0064] The control module 200 may be configured to be switchable between a primary mode in which it can be used as the primary control module 200A and a secondary mode in which it can be used as the secondary control module 200B. For example, as shown in FIG. 7 , the control module 200 further includes mode switches 281, 282, and 283 and mode switches 284, 285, and 286. The mode switch 281 connects the output terminal 242N of the main switch 240 to the first connector 221 in the primary mode and disconnects the output terminal 242N from the first connector 221 in the secondary mode. The mode switch 282 connects the feedback line 272 to the negative terminal 232 of the current source 230 in the primary mode and disconnects the feedback line 272 from the negative terminal 232 in the secondary mode. The mode switch 283 connects the feedback line 272 to the first connector 221 in the secondary mode and disconnects the feedback line 272 from the first connector 221 in the primary mode.

[0065] The mode switch 284 connects the output terminal 262N of the second main switch 260 to the first connector 221 in the primary mode, and disconnects the output terminal 262N from the first connector 221 in the secondary mode. The mode switch 285 connects the feedback line 275 to the negative electrode 252 of the second current source 250 in the primary mode, and disconnects the feedback line 275 from the negative electrode 252 in the secondary mode. The mode switch 286 connects the feedback line 275 to the first connector 221 in the secondary mode, and disconnects the feedback line 275 from the first connector 221 in the primary mode. As described above, the hardware configurations of the primary control module 200A and the secondary control module 200B can be unified, and the production efficiency of the power conversion system 1 can be improved.

[0066] Depending on the number of power modules 100 used, there may be cases where no power module 100 is connected to the first connector 221 or the second connector 222 in the primary control module 200A or the secondary control module 200B. In this case, a termination connector 290 may be connected to the first connector 221 or the second connector 222 to which no power module 100 is connected. Furthermore, there may be cases where the secondary control module 200B is not required. In this case, the termination connector 290 may be connected to the third connector 223 of the primary control module 200A. For example, the termination connector 290 has a short-circuit line 291 and a second short-circuit line 292. The short-circuit line 291 feeds back the switch drive current output from the destination connector (the first connector 221, the second connector 222, or the third connector 223) to the destination connector. The second short-circuit line 292 feeds back the second switch drive current output from the destination connector to the destination connector.

[0067] [Effects of the embodiment] The power conversion system 1 comprises a plurality of power modules 100 that output electric power, and a control module connected to the plurality of power modules 100. The control module has a current source 230 that supplies a switch drive current, and a main switch 240 that cuts off the switch drive current from the current source 230 in response to detection of an external abnormality. Each of the plurality of power modules 100 has a power conversion circuit 110 that outputs electric power, a power-off switch 140 that continues the output of the power conversion circuit 110 when there is an input of the switch drive current, and stops the output of the power conversion circuit 110 in response to detection of an internal abnormality, and an input cut-off switch 150 that cuts off the input of the switch drive current to the power-off switch 140 in response to detection of an internal abnormality. The current source 230, the main switch 240, and the power-off switches 140 and input cut-off switches 150 of the plurality of power modules 100 are connected in series.

[0068] According to this power conversion system 1, a current source 230, a main switch 240, and the power-off switches 140 and input cutoff switches 150 of the multiple power modules 100 are connected in series, which allows the multiple power modules 100 to be stopped collectively with high reliability. For example, if an external abnormality occurs, the main switch 240 can cut off the switch drive current to the multiple power modules 100, thereby stopping the output of the multiple power modules 100 collectively. If an internal abnormality occurs in any of the multiple power modules 100, the input cutoff switch 150 can cut off the switch drive current to the multiple power modules 100, thereby stopping the output of the multiple power modules 100 collectively. Therefore, this power conversion system 1 is effective in achieving both high reliability in stopping the multiple power modules 100 collectively and a simple system.

[0069] The power-off switch 140 is maintained in a state where a pair of power-off input terminals 141P and 141N are electrically connected to each other by inputting a switch drive current to the pair of power-off input terminals 141P and 141N. 1 The input cutoff switch 150 has a pair of cutoff input terminals 151P, 151N and a pair of cutoff output terminals 152P, 152N that are maintained in a mutually conductive state by input of an on-current to the pair of cutoff input terminals 151P, 151N and that are cut off from each other when the input of the on-current to the pair of cutoff input terminals 151P, 151N is stopped, and in the series connection of the current source 230, the main switch 240, and the power-off switches 140 and input cutoff switches 150 of the multiple power modules 100, the pair of power-off input terminals 141P, 141N and the pair of cutoff output terminals 152P, 152N may be connected in series. Switches configured similarly can be used as the power-off switch 140 and the input cutoff switch 150.

[0070] Each of the multiple power modules 100 may further include a power-off circuit 121 that stops output from the power conversion circuit 110 when the pair of power-off output terminals 142P, 142N are disconnected from each other, and an internal diagnostic circuit 122 that inputs an ON current to the pair of disconnection input terminals 151P, 151N and stops the input of the ON current upon detection of an internal abnormality. Simplifying the power-off switch 140 and the input disconnection switch 150 can further improve reliability.

[0071] Each of the multiple power modules 100 further has a first connector 131 that receives a switch drive current from a current source 230, a second connector 132 that outputs the switch drive current that has passed through a power-off switch 140 and an input cutoff switch 150, and a feedback line 133 that feeds back the switch drive current from the second connector 132 to the first connector 131. The multiple power modules 100 may include one directly connected module whose first connector 131 is connected to the current source 230 of the power module 100, and one or more indirectly connected modules whose first connectors 131 are connected to the second connectors 132 of other power modules 100. This simplifies the wiring for connecting the current source 230, the main switch 240, and the power-off switches 140 and input cutoff switches 150 of the multiple power modules 100 in series.

[0072] The one or more indirectly connected modules may include a termination module that is not another power module 100, and a termination connector 190 that returns the switch drive current output from the second connector 132 to the feedback line 133 may be connected to the second connector 132 of the termination module. The supply route that supplies the switch drive current to the power-off switches 140 and input cutoff switches 150 of the multiple power modules 100 and the feedback route formed by the feedback lines 133 of the multiple power modules 100 can be easily connected by the termination connector 190. This makes it possible to further simplify the wiring.

[0073] The current source 230 may be a constant current source, which can supply a more stable switch drive current to the power-off switches 140 and the input cutoff switches 150 of the multiple power modules 100.

[0074] The control module includes a second current source 250 that supplies a second switch drive current and a second main switch 260 that cuts off the second switch drive current from the second current source 250 in response to detection of an external abnormality, and each of the multiple power modules 100 includes a second power-off switch 160 that continues output from the power conversion circuit 110 when the second switch drive current is input and stops the output of the power conversion circuit 110 when the input of the second switch drive current stops, and a second input cut-off switch 170 that cuts off the input of the second switch drive current to the second power-off switch 160 in response to detection of an internal abnormality, and the second current source 250, the second main switch 260, and the second power-off switches 160 and second input cut-off switches 170 of the multiple power modules 100 may be connected in series. By providing a redundant system that stops the output from the power conversion circuit 110 in response to an external abnormality or an internal abnormality, the reliability of collectively stopping the multiple power modules 100 can be further improved.

[0075] By providing a redundant system that stops the output from the power conversion circuit 110 in response to an external or internal abnormality, it becomes possible to satisfy SIL2 of Part 7 of IEC 61508.

[0076] Each of the multiple power modules 100 may further include an internal diagnostic circuit 122 that diagnoses the presence or absence of an internal abnormality based on a comparison between the status of the power-off switch 140 and the status of the second power-off switch 160, and when the internal diagnostic circuit 122 diagnoses the presence of an internal abnormality, the input cutoff switch 150 may cut off the input of the switch drive current to the power-off switch 140, and the second input cutoff switch 170 may cut off the input of the switch drive current to the second power-off switch 160. Internal abnormalities can be detected more reliably with simple logic.

[0077] By diagnosing whether or not there is an internal abnormality based on a comparison between the status of the power-off switch 140 and the status of the second power-off switch 160, mutual monitoring of the dual output shutdown systems is achieved, making it possible to meet SIL3 of Part 7 of IEC 61508.

[0078] Each of the multiple power modules 100 further has a first connector 131 connected to the control module and receiving a switch drive current from the current source 230 and a second switch drive current from the second current source 250, a second connector 132 outputting the switch drive current that has passed through the power-off switch 140 and the input disconnection switch 150 and the second switch drive current that has passed through the second power-off switch 160 and the second input disconnection switch 170, a feedback line 133 that feeds back the switch drive current from the second connector 132 to the first connector 131, and a second feedback line 134 that feeds back the second switch drive current from the second connector 132 to the first connector 131, and the multiple power modules 100 may include one directly connected module whose first connector 131 is connected to the current source 230 of the power module 100, and one or more indirectly connected modules whose first connectors 131 are connected to the second connectors 132 of other power modules 100. The wiring for connecting the current source 230, the main switch 240, the power-off switches 140 and the input cutoff switches 150 of the multiple power modules 100 in series, and for connecting the second current source 250, the second main switch 260, the second power-off switches 160 and the second input cutoff switches 170 of the multiple power modules 100 in series can be simplified.

[0079] The one or more indirectly connected modules may include a termination module that is not another power module 100, and a termination connector 190 may be connected to the second connector 132 of the termination module, which returns the switch drive current output from the second connector 132 to the feedback line 133 and returns the second switch drive current output from the second connector 132 to the second feedback line 134. The termination connector 190 can easily connect a supply route that supplies switch drive current to the power-off switches 140 and input cutoff switches 150 of the multiple power modules 100 and a feedback route formed by the feedback lines 133 of the multiple power modules 100. Furthermore, the termination connector 190 can easily connect a second supply route that supplies second switch drive current to the second power-off switches 160 and second input cutoff switches 170 of the multiple power modules 100 and a second feedback route formed by the second feedback lines 134 of the multiple power modules 100. This allows for further simplification of wiring.

[0080] The configuration may further include a secondary control module 200B, and the multiple power modules 100 may include multiple primary power modules 100A controlled by the control module without via the secondary control module 200B, and one or more secondary power modules 100B controlled by the control module via the secondary control module 200B, and the power-off switches 140 and input cutoff switches 150 of the one or more secondary power modules 100B may be connected in series with the current source 230, the main switch 240, and the power-off switches 140 and input cutoff switches 150 of the multiple primary power modules 100A via the secondary control module 200B. Even in a configuration where the secondary control module 200B is present, the wiring for connecting the current source 230, the main switch 240, and the power-off switches 140 and input cutoff switches 150 of the multiple power modules 100 in series can be simplified.

[0081] Although the embodiments have been described above, the present disclosure is not necessarily limited to the above-described embodiments, and various modifications are possible without departing from the spirit and scope of the present disclosure. For example, the main switch 240 may be provided between the negative electrode 232 and the feedback line 272, instead of between the positive electrode 231 and the first connector 221. The second main switch 260 may be provided between the negative electrode 252 and the feedback line 275, instead of between the positive electrode 251 and the first connector 221. Furthermore, in each power module 100, the connection order of the power-off switch 140 and the input cutoff switch 150 may be reversed. The control module 200 may be divided into multiple modules. For example, the control module 200 may be divided into a control module for power conversion control having a main control circuit 210, and a control module for cutoff control having a current source 230, a main switch 240, a second current source 250, and a second main switch 260. [Explanation of symbols]

[0082] 1...power conversion system, 100...power module, 200A...primary control module, 100A...primary power module, 100B...secondary power module, 110...power conversion circuit, 230...current source, 240...main switch, 140...power-off switch, 141P...power-off input terminal, 142P...power-off output terminal, 121...power-off circuit, 150...input disconnect switch, 151P...disconnect input terminal, 152P...disconnect output terminal, 122...internal diagnostic circuit, 250...second current source, 260...second main switch, 160...second power-off switch, 170...second input disconnect switch, 131...first connector, 132...second connector, 133...feedback line, 134...second feedback line, 190...termination connector, 200B...secondary control module.

Claims

1. a plurality of power modules that output electric power; a control module connected to the plurality of power modules; The control module a current source for providing a switch drive current; a main switch that cuts off the switch drive current from the current source in response to detection of an external abnormality; Each of the plurality of power modules a power conversion circuit that outputs power; a power-off switch that continues output of the power conversion circuit when the switch drive current is input, and stops output of the power conversion circuit when the input of the switch drive current is stopped; an input cutoff switch that cuts off the input of the switch drive current to the power-off switch in response to detection of an internal abnormality, the current source, the main switch, and the plurality of power modules are connected in series; a power conversion system in which the power-off switch and the input cutoff switch of each of the plurality of power modules are connected in series with each other in the series connection of the current source, the main switch, and the plurality of power modules;

2. The power-off switch is a pair of power-off input terminals; a pair of power-off output terminals that are maintained in a mutually conductive state by the input of the switch drive current to the pair of power-off input terminals and that are cut off from each other in response to the stop of the input of the switch drive current to the pair of power-off input terminals; The input cutoff switch is a pair of interruption input terminals; a pair of cutoff output terminals that are maintained in a mutually conductive state by an input of an on-current to the pair of cutoff input terminals and that are cut off from each other in response to a stop of the input of the on-current to the pair of cutoff input terminals; The power conversion system according to claim 1 , wherein the pair of power-off input terminals and the pair of cutoff output terminals are connected in series in the series connection.

3. Each of the plurality of power modules a power-off circuit that stops an output from the power conversion circuit when the pair of power-off output terminals are disconnected from each other; 3. The power conversion system according to claim 2, further comprising an internal diagnostic circuit that inputs an ON current to the pair of interruption input terminals and stops the input of the ON current in response to detection of the internal abnormality.

4. Each of the plurality of power modules a first connector for receiving the switch drive current from the current source in the series connection; a second connector for outputting the switch drive current that has passed through the power-off switch and the input cutoff switch in the series connection; a feedback line for returning the switch drive current from the second connector to the first connector, The plurality of power modules include: a direct connection module, the first connector of which is connected to the current source of the control module; The power conversion system according to any one of claims 1 to 3, further comprising: one or more indirectly connected modules, each of which has the first connector connected to the second connector of another power module.

5. the one or more indirectly connected modules include a termination module that is not the other power module; The power conversion system according to claim 4 , wherein a termination connector is connected to the second connector of the termination module, the termination connector returning the switch drive current output from the second connector to the feedback line.

6. The power conversion system according to any one of claims 1 to 5, wherein the current source is a constant current source.

7. The control module a second current source that supplies a second switch drive current; a second main switch that cuts off the second switch drive current from the second current source in response to the detection of the external abnormality; Each of the plurality of power modules a second power-off switch that continues output of the power conversion circuit when the second switch drive current is input, and stops output of the power conversion circuit when the input of the second switch drive current is stopped; a second input cutoff switch that cuts off input of the second switch drive current to the second power-off switch in response to detection of the internal abnormality, the second current source, the second main switch, and the plurality of power modules are connected in series to form a second series connection different from the first series connection; 3. The power conversion system according to claim 1, wherein in the second series connection, the second power-off switch and the second input cutoff switch of each of the plurality of power modules are connected in series with each other.

8. Each of the plurality of power modules an internal diagnostic circuit for diagnosing the presence or absence of the internal abnormality based on a comparison between a status of the power-off switch and a status of the second power-off switch; 8. The power conversion system according to claim 7, wherein, when the internal diagnostic circuit diagnoses the presence of the internal abnormality, the input cut-off switch cuts off the input of the switch drive current to the power-off switch, and the second input cut-off switch cuts off the input of the second switch drive current to the second power-off switch.

9. Each of the plurality of power modules a first connector for receiving the switch drive current from the current source in the series connection and for receiving the second switch drive current from the second current source in the second series connection; a second connector that outputs the switch drive current that has passed through the power-off switch and the input cutoff switch in the series connection, and outputs the second switch drive current that has passed through the second power-off switch and the second input cutoff switch in the second series connection; a feedback line for returning the switch drive current from the second connector to the first connector; a second feedback line that feeds back the second switch drive current from the second connector to the first connector; The plurality of power modules include: a direct connection module, the first connector of which is connected to the current source of the control module; The power conversion system according to claim 7 or 8, further comprising: one or more indirectly connected modules each having the first connector connected to the second connector of another power module.

10. the one or more indirectly connected modules include a termination module that is not the other power module; 10. The power conversion system of claim 9, wherein a termination connector is connected to the second connector of the termination module, the termination connector returning the switch drive current output from the second connector to the feedback line and returning the second switch drive current output from the second connector to the second feedback line.

11. Further comprising a secondary control module, The plurality of power modules include: a plurality of primary power modules connected to the control module without passing through the secondary control module; one or more secondary power modules connected to the control module via the secondary control module; The power conversion system according to any one of claims 1 to 10, wherein the one or more secondary power modules are connected in series with the current source, the main switch, and the plurality of primary power modules via the secondary control module.

12. a power conversion circuit connected to the control module and outputting power; a first connector for receiving a switch drive current from the control module; a power-off switch that continues output of the power conversion circuit when the switch drive current is input from the control module, and stops output of the power conversion circuit when the control module stops input of the switch drive current; an input cutoff switch that cuts off the input of the switch drive current to the power-off switch in response to detection of an internal abnormality; a second connector for outputting the switch driving current that has passed through the power-off switch and the input cutoff switch; a feedback line for returning the switch drive current from the second connector to the first connector; Equipped with The power-off switch and the input cutoff switch are connected in series with each other between the first connector and the second connector.

13. A control module connected to a plurality of power modules that output electric power, a current source providing a constant switch drive current; a main switch that cuts off the switch drive current from the current source in response to detection of an external abnormality; a second current source that supplies a second switch drive current; a second main switch that cuts off the second switch drive current from the second current source in response to the detection of the external abnormality; Equipped with Each of the plurality of power modules a power conversion circuit that outputs power; a power-off switch that continues output of the power conversion circuit when the switch drive current is input, and stops output of the power conversion circuit when the input of the switch drive current is stopped; an input cutoff switch that cuts off the input of the switch drive current to the power-off switch in response to detection of an internal abnormality; a second power-off switch that continues output of the power conversion circuit when the second switch drive current is input, and stops output of the power conversion circuit when the input of the second switch drive current is stopped; a second input cutoff switch that cuts off input of the second switch drive current to the second power-off switch in response to detection of the internal abnormality, the current source and the main switch are connected in series with the plurality of power modules to form a first series connection; the second current source and the second main switch are connected in series with the plurality of power modules to form a second series connection; In the first series connection, the power-off switch and the input cutoff switch are connected in series with each other, A control module, wherein the second power-off switch and the second input cutoff switch are connected in series with each other in the second series connection.

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