Drive device

Abstract

This invention provides a drive device that eliminates the need for external wiring connected to input terminals that can be assumed to be unused in a drive device for a load device such as a motor. An inverter device (1) according to one embodiment of this invention includes: input terminals (EN1, EN2) for connecting to signal lines from an emergency stop switch (ES); an input circuit (240) connected to the input terminals for receiving signals input through the input terminals; and a switching switch (250) that switches between a first state where the input circuit (240) cannot receive signals input through the input terminals or the inverter device (1) cannot utilize signals received by the input circuit (240), and a second state where the input circuit (240) can receive signals input through the input terminals or the inverter device (1) can utilize signals received by the input circuit (240).

Description

Technical Field

[0001] This invention relates to a drive device. Background Technology

[0002] For example, there is a known drive device that drives a load device such as an electric motor while using an input signal from an external source (see Patent Document 1).

[0003] Patent Document 1 discloses a servo driver that uses an input signal based on the operating state of an emergency stop switch to activate the safety function (safe torque shut-off function) of the motor of the driven object.

[0004] <Prior art documents>

[0005] <Patent Documents>

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-136712 Summary of the Invention

[0007] <Problem to be solved by this invention>

[0008] However, for example, if the aforementioned safety function is disabled, the input signal of the object may become unusable. In this case, the input terminal of the device corresponding to the input signal of the object is not connected to the signal line for transmitting the input signal of the object, and becomes unused.

[0009] However, when the input terminals are not in use, it is necessary to maintain (fix) the potential of the input circuit used to receive the input signal of the target device in a state where the input signal of the target device is not input. Therefore, for example, when shipping the drive unit, an external wiring method using shorting bars, jumpers, etc., is adopted to short-circuit the power supply and other components between the unused input terminals, thereby fixing the potential of the unused input terminals. As a result, problems such as increased labor costs due to external wiring operations and drive unit malfunctions due to wiring operation errors may occur.

[0010] Therefore, in view of the above-mentioned problems, the object of the present invention is to provide a technique in a drive device for a load device such as a drive motor that can omit external wiring connected to an input terminal that can be assumed to be unused.

[0011] <Methods for solving problems>

[0012] To achieve the above objectives, in one embodiment of the present invention, a driving device is provided, comprising:

[0013] Input terminals, which can be connected to specified signal lines;

[0014] An input circuit, connected to the aforementioned input terminals, is used to receive signals input through the aforementioned input terminals; and

[0015] The switching unit switches between a first state where the input circuit cannot receive signals input through the input terminal or the driving device cannot utilize signals received by the input circuit, and a second state where the input circuit can receive signals input through the input terminal or the driving device can utilize signals received by the input circuit.

[0016] In another embodiment, a driving device is provided, including...

[0017] Power terminals;

[0018] Input terminals, which can be connected to specified signal lines;

[0019] An input circuit, which is connected to the aforementioned input terminals, is used to receive signals input through the aforementioned input terminals;

[0020] The switching unit switches between a first state of the input circuit, which is equivalent to the state in which the input terminals and the power supply terminals are short-circuited, and a second state of the input circuit, which is equivalent to the state in which the input terminals and the power supply terminals are not short-circuited.

[0021] <The Effects of the Invention>

[0022] According to the above embodiments, in a drive device for a load device such as a drive motor, external wiring connected to an input terminal that can be assumed to be unused can be omitted. Attached Figure Description

[0023] Figure 1 This is a diagram showing an example of the configuration of an inverter device.

[0024] Figure 2 This is a diagram showing an example of the configuration of an inverter device.

[0025] Figure 3 This is a diagram showing the configuration of the inverter device for a comparative example. Detailed Implementation

[0026] The embodiments will now be described with reference to the accompanying drawings.

[0027] [Composition of an inverter device]

[0028] First, refer to Figure 1 , Figure 2 The configuration of the inverter device 1 in this embodiment will be described.

[0029] Figure 1 , Figure 2This is a diagram illustrating an example of the configuration of the inverter device 1 according to this embodiment. Specifically, Figure 1 This diagram shows the state of inverter unit 1 when the safety function associated with motor M is activated in its operating mode. Figure 2 This is a diagram showing the state of inverter unit 1 in a non-operation mode when the safety functions associated with motor M are not activated.

[0030] Inverter device 1 (an example of a drive device) generates alternating current with a specified voltage and a specified frequency based on power input through at least one of the AC input section ACIN and the DC input section DCIN, thereby driving the load device.

[0031] For example, such as Figure 1 , Figure 2 As shown, inverter device 1 rectifies the AC power from the commercial power supply CPS input via AC input section ACIN to convert it into DC power, and then converts the DC power into a specified AC power to drive motor M (an example of a load device). Alternatively, for example, inverter device 1 can convert DC power input via DC input section DCIN from the DC common bus, etc., into a specified AC power to drive motor M. Furthermore, for example, inverter device 1 can convert both DC power input via DC input section DCIN and DC power converted from AC power input via AC input section ACIN into a specified AC power to drive motor M. Additionally, for example, inverter device 1 can drive other load devices different from motor M based on power input via at least one of AC input section ACIN and DC input section DCIN.

[0032] like Figure 1 , Figure 2 As shown, the inverter device 1 includes a main circuit section 100 and a control circuit section 200. Various components of the inverter device 1, including the main circuit section 100 and the control circuit section 200, are housed inside the housing 1H or mounted on the surface of the housing 1H in a manner that exposes them to the outside of the housing 1H.

[0033] The main circuit section 100 includes an AC input section ACIN, a rectifier circuit 110, a smoothing circuit 120, an inverter circuit 130, an AC output section ACOUT, a charging circuit 140, and a DC input section DCIN.

[0034] The AC input section ACIN is used to receive three-phase AC power (R-phase, S-phase, and T-phase) from an external source. In this example, the AC input section ACIN can receive three-phase AC power (R-phase, S-phase, and T-phase) via three power lines extending from the commercial power supply CPS. The AC input section ACIN includes AC input terminals R, S, and T, which are respectively connected to the power lines of the R-phase, S-phase, and T-phase.

[0035] The rectifier circuit 110 is configured to rectify the three-phase AC power input from the AC input section ACIN (R-phase, S-phase, and T-phase) to output DC power. In the rectifier circuit 110, the positive and negative output terminals are connected to one end of the positive line PL and the negative line NL, respectively. Through the positive line PL and the negative line NL, the DC power can be output to the smoothing circuit 120. The rectifier circuit 110 includes, for example, six diodes, forming three sets of bridge-type full-wave rectifier circuits where two diodes forming the upper and lower bridge arms are connected in series and then connected in parallel.

[0036] The smoothing circuit 120 suppresses and smooths the pulsations of the DC power output from the self-rectifying circuit 110, the DC power input through the DC input section DCIN, and the DC power regenerated by the inverter circuit 130.

[0037] The smoothing circuit 120 includes a smoothing capacitor 122 and a reactor 124.

[0038] The smoothing capacitor 122 is connected in parallel with the rectifier circuit 110 and the inverter circuit 130 in the path connecting the positive line PL and the negative line NL.

[0039] The smoothing capacitor 122 appropriately smooths the DC power output from the self-rectifier circuit 110, the DC power input from the DC input section DCIN, and the DC power output (regenerated) from the inverter circuit 130 while repeatedly charging and discharging.

[0040] There can be one smoothing capacitor 122. Alternatively, multiple smoothing capacitors 122 can be configured, and these multiple smoothing capacitors 122 can be connected in parallel between the positive line PL and the negative line NL, or they can be connected in series. In addition, multiple smoothing capacitors 122 can also be configured by connecting two or more smoothing capacitors 122 in series in parallel between the positive line PL and the negative line NL.

[0041] Reactor 124 is located on the positive line PL between rectifier circuit 110 and smoothing capacitor 122 (specifically, at the branch point of the path where the smoothing capacitor is located). For example, as Figure 1 , Figure 2As shown, reactor 124 can be configured to connect the reactor connection terminals LT1 and LT2, which are led outwards from the ends of the positive line PL, which is cut off between the rectifier circuit 110 and the smoothing capacitor 122. Alternatively, for example, reactor 124 can be built inside the housing 1H of inverter device 1.

[0042] The reactor 124 appropriately generates voltage in a manner that hinders changes in current, while smoothing the DC current output from the rectifier circuit 110, the DC current input from the DC input section DCIN, and the DC current output (regenerated) from the inverter circuit 130.

[0043] It should be noted that reactor 124 can be omitted. In this case, in Figure 1 , Figure 2 In the middle, a short-circuit conductor is connected between the reactor connection terminals LT1 and LT2.

[0044] In inverter circuit 130, its positive and negative input terminals are connected to the other ends of the positive line PL and the negative line NL. Inverter circuit 130 converts the direct current supplied through the self-smoothing circuit 120 via the positive line PL and the negative line NL into three-phase alternating current (U-phase, V-phase, and W-phase) with a predetermined frequency and voltage, and outputs it to motor M via the switching operation of semiconductor switching elements. The semiconductor switching elements can be, for example, silicon (Si) IGBTs (Insulated Gate Bipolar Transistors) or MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors). Alternatively, the semiconductor switching elements can be semiconductor elements using wide-bandgap semiconductors such as silicon carbide (SiC) or gallium nitride (GaN).

[0045] The inverter circuit 130 is configured with a bridge circuit, which includes, for example, six semiconductor switching elements, and three sets of series-connected bodies (switching arms) of two semiconductor switching elements forming the upper and lower bridge arms are connected in parallel between the positive line PL and the negative line NL. Furthermore, the inverter circuit 130 can output three-phase AC power through the U-phase line, V-phase line, and W-phase line drawn from the connection points of the three sets of upper and lower bridge arms. Additionally, return diodes can be connected in parallel with each of the six semiconductor switching elements.

[0046] The AC output unit ACOUT is connected to the motor M via three power lines: U-phase, V-phase, and W-phase. The AC output unit ACOUT includes AC output terminals U, V, and W, which are respectively connected to the U-phase, V-phase, and W-phase power lines.

[0047] The charging circuit 140 is located on the positive line PL between the rectifier circuit 110 and the smoothing capacitor 122. For example, as... Figure 1 , Figure 2 As shown, the charging circuit 140 can be located on a portion of the positive line PL between the rectifier circuit 110 and the reactor 124. Alternatively, for example, the charging circuit 140 can be located on a portion of the positive line PL between the reactor 124 and the smoothing capacitor 122. The charging circuit 140 includes a switch 142 and a charging resistor 144.

[0048] Switch 142 is located on the positive line PL between rectifier circuit 110 and smoothing circuit 120 (reactor 124). Switch 142 is configured to open and close the positive line PL. Switch 142 is a switching element such as a thyristor, bidirectional thyristor, or relay.

[0049] The charging resistor 144 is connected in parallel with the switch 142.

[0050] The charging circuit 140 operates by allowing the current flowing through the positive line PL toward the smoothing circuit 120 to pass through switch 142 when switch 142 is on, and through charging resistor 144 when switch 142 is off. Thus, in the inverter device 1, during startup, by opening switch 142, current flows through charging resistor 144, thereby preventing a relatively large inrush current when charging the smoothing capacitor 122. Furthermore, in the inverter device 1, if the smoothing capacitor 122 is charged to a certain extent and the voltage between the positive line PL and the negative line NL becomes relatively high, switch 142 is turned on, allowing current to flow through the positive line PL via the relatively low-resistance switch 142. Specifically, if a voltage detection circuit (not shown) detects a voltage exceeding a predetermined value by detecting the voltage between the positive line PL and the negative line NL, it is determined that the inrush current is suppressed, and switch 142 is turned on from the off state.

[0051] The DC input section DCIN is used to input DC power from an external source. The DC input section DCIN includes a positive DC terminal P and a negative DC terminal N.

[0052] The positive DC terminal P is led out from the positive line PL. For example, as... Figure 1 , Figure 2 As shown, the positive DC terminal P can be led out from a portion of the positive line PL between the charging circuit 140 and the inverter circuit 130, specifically from the reactor 124 and the inverter circuit 130. Furthermore, for example, as described above, the positional relationship between the reactor 124 and the charging circuit 140 in the positive line PL is... Figure 1 , Figure 2 Conversely, the positive DC terminal P can be led out from a portion of the positive line PL between the reactor 124 and the charging circuit 140.

[0053] The negative DC terminal N is led out from any position on the negative line NL. For example, as... Figure 1 As shown, the negative DC terminal N is partially connected inside the housing 1H to the negative line NL between the smoothing circuit 120 (smoothing capacitor 122) and the inverter circuit 130.

[0054] It should be noted that the DC input section DCIN can be omitted.

[0055] The control circuit section 200 performs control related to the inverter device 1.

[0056] The functions of the control circuit unit 200 can be implemented by any hardware or any combination of hardware and software. For example, the control circuit unit 200 may consist of a computer including a storage device such as a CPU (Central Processing Unit), a RAM (Random Access Memory), a non-volatile auxiliary storage device such as ROM (Read Only Memory), and an interface device for input / output with external devices.

[0057] The control circuit section 200 includes a drive circuit 210, a control section 220, a cut-off circuit 230, a power supply terminal PLC, input terminals EN1 and EN2, a common terminal CM, an input circuit 240, and a changeover switch 250.

[0058] Under the control of the control unit 220, the drive circuit 210 outputs a drive signal for ON / OFF driving the semiconductor switching element to the inverter circuit 130 (the gate of the semiconductor switching element).

[0059] The control unit 220 generates drive signals, such as PWM (Pulse Width Modulation) signals to achieve a specified operating state of the motor M, and outputs the drive signals to the inverter circuit 130 (semiconductor switching element) via the drive circuit 210. Thus, the control unit 220 can operate the inverter circuit 130 to drive and control the motor M.

[0060] A cut-off circuit 230 (an example of a signal utilization unit) is provided on the path (signal line) between the control unit 220 and the drive circuit 210. The cut-off circuit 230 cuts off the signal path between the control unit 220 and the drive circuit 210 based on a predetermined digital signal (hereinafter referred to as a "safety signal") input from input terminals EN1 and EN2 and received by the input circuit 240. Specifically, if a safety signal is input to the cut-off circuit 230 from at least one of the input circuits 241 and 242 (described later), the signal path between the control unit 220 and the drive circuit 210 is cut off. Thus, the cut-off circuit 230 cuts off the transmission of the drive signal from the control unit 220 to the drive circuit 210, thereby cutting off the power supply from the autonomous circuit unit 100 to the load device (motor M). Therefore, the control circuit unit 200 can, based on the safety signal input from the outside, use the cut-off circuit 230 to realize a safe torque off (STO) function as a safety function to cut off the power supply to the load device.

[0061] The power terminal PLC is configured to output power from the internal power supply IPS to the outside. The power terminal PLC is located on the surface of the housing 1H. Inside the housing 1H, it is connected to the positive terminal of the internal power supply IPS via a diode for reverse current prevention.

[0062] The input terminals EN1 and EN2 are configured to connect to signal lines used to transmit digital signals (safety signals) that enable safety functions.

[0063] For example, such as Figure 1 As shown, in the safety function's operating mode, input terminals EN1 and EN2 are connected to the emergency stop switch ES. Additionally, as... Figure 2 As shown, in the non-operational mode of the safety function, the input terminals EN1 and EN2 are not connected to the signal lines and are in an unused state.

[0064] The emergency stop switch ES operates according to the operation of users such as factory operators, which are set up according to the machine electrically driven by the motor M, and can manually output a safety signal.

[0065] The emergency stop switch ES has two normally closed switches connected in parallel. One end of each switch is connected to the input terminals EN1 and EN2 via signal lines, and the other end of each switch is connected to the power supply terminal of the PLC via signal lines.

[0066] When the emergency stop switch ES is not activated, both switches are closed. Therefore, the input terminals EN1 and EN2 and the power supply terminal PLC are short-circuited outside the housing 1H via signal lines. Consequently, when the emergency stop switch ES is not activated, a high-level digital signal (hereinafter referred to as the "H signal") is always input to the input terminals EN1 and EN2.

[0067] On the other hand, when the emergency stop switch ES is operated, both switches transition from the closed state to the open state. Therefore, the connection between input terminals EN1 and EN2 and the power supply terminal PLC transitions to the off state outside the housing 1H. Consequently, if the emergency stop switch ES is operated, a low-level digital signal (hereinafter referred to as the "L signal") corresponding to a safety signal is input to input terminals EN1 and EN2.

[0068] The common terminal CM is a terminal sharing a reference potential with input terminals EN1 and EN2. The common terminal CM can be grounded internally within the housing 1H. Alternatively, the common terminal CM can be grounded via, for example, a signal line connected to an external source.

[0069] The input circuit 240 receives the safety signals input from the input terminals EN1 and EN2 and outputs them to the cut-off circuit 230.

[0070] The input circuit 240 includes input circuits 241 and 242.

[0071] The input circuit 241 is located between the input terminal EN1 and the cut-off circuit 230, and is configured to receive the safety signal input from the input terminal EN1 and output it to the cut-off circuit 230.

[0072] The input circuit 241 includes an optocoupler 241A and an input resistor 241B.

[0073] The optocoupler 241A includes a photodiode 241A1 and a phototransistor 241A2.

[0074] The positive terminal of photodiode 241A1 is connected to the input terminal EN1 via the input resistor 241B through a signal line, and its negative terminal is connected to the common terminal CM via a signal line.

[0075] The collector of the phototransistor 241A2 is connected to the constant voltage power supply CVS via a signal line, and its emitter is grounded via an output resistor and connected to the cut-off circuit 230 via a signal line. The constant voltage power supply CVS (an example of a constant potential section) is, for example, a power supply circuit with an output voltage of 5V.

[0076] The input circuit 242 is located between the input terminal EN2 and the cut-off circuit 230, and is configured to receive the safety signal input from the input terminal EN2 and output it to the cut-off circuit 230.

[0077] The input circuit 242 includes an optocoupler 242A and an input resistor 242B.

[0078] The optocoupler 242A includes a photodiode 242A1 and a phototransistor 242A2.

[0079] The positive terminal of photodiode 242A1 is connected to the input terminal EN2 via the input resistor 242B through a signal line, and its negative terminal is connected to the common terminal CM via a signal line.

[0080] The collector of the phototransistor 242A2 is connected to the constant voltage power supply CVS via a signal line, and its emitter is grounded via an output resistor and connected to the cut-off circuit 230 via a signal line.

[0081] The switch 250 (an example of a switching unit) is used to switch the open / closed state of the path between the constant voltage power supply CVS and the signal lines on the output sides of the input circuits 241 and 242, i.e., the signal lines connected to the emitters of the phototransistors 241A2 and 242A2. The switch 250 is mechanically switched by user operation, for example. The switch 250 is located, for example, in a position easily visible to the user when the cover of the housing 1H is open (e.g., on the substrate of the control circuit section 200), and can be a slide switch that allows the user to slide between two positions.

[0082] The changeover switch 250 includes changeover switches 251 and 252.

[0083] The switching switch 251 is used to switch the open / closed state of the path between the constant voltage power supply CVS and the signal line on the output side of the input circuit 241. If the switching switch 251 is ON and thus closed, the path between the constant voltage power supply CVS and the signal line on the output side of the input circuit 241 becomes conductive, and the signal line on the output side of the input circuit 241 is maintained (fixed) at a relatively high potential, that is, the potential equivalent to the H signal.

[0084] The toggle switch 252 is used to switch the open / closed state of the path between the constant voltage power supply CVS and the signal line on the output side of the input circuit 242. If the toggle switch 252 is ON and thus closed, the path between the constant voltage power supply CVS and the signal line on the output side of the input circuit 242 becomes conductive, and the signal line on the output side of the input circuit 242 is maintained (fixed) at a potential equivalent to the H signal.

[0085] Switches 251 and 252 can be configured, for example, so that the user can perform ON / OFF operations separately. Alternatively, switches 251 and 252 can be configured, for example, so that the user can perform ON / OFF operations together.

[0086] like Figure 1 , Figure 2 As shown, switches 251 and 252 are set to the OFF state when the safety function is in operation mode, and to the ON state when the safety function is not in operation mode.

[0087] [The specific operation of the input circuit]

[0088] Next, continue to refer to Figure 1 , Figure 2 The specific operation of the input circuit 240 will be explained.

[0089] <When the safety function is in operation mode>

[0090] like Figure 1 As shown, in the safety function operation mode, as described above, the input terminals EN1 and EN2 are connected to the emergency stop switch ES via signal lines, and the toggle switches 251 and 252 are set to the OFF state.

[0091] With the emergency stop switch ES not activated, as described above, an H signal is input to the input terminals EN1 and EN2. Therefore, in the photodiodes 241A1 and 242A1 of the optocouplers 241A and 242A, current flows from the input terminals EN1 and EN2 to the common terminal CM, thereby setting the phototransistors 241A2 and 242A2 to the ON state. This establishes a connection between the constant voltage power supply CVS and the cutoff circuit 230, allowing an H signal to be input to the cutoff circuit 230.

[0092] In this case, the disconnect circuit 230 maintains the signal path between the control unit 220 and the drive circuit 210 in a connected state, and the control unit 220 can output a drive signal to the inverter circuit 130 through the drive circuit 210.

[0093] On the other hand, if the emergency stop switch ES is operated, as described above, an L signal, serving as a safety signal, is input to the input terminals EN1 and EN2. Therefore, no current flows through the photodiodes 241A1 and 242A1 of the optocouplers 241A and 242A, and the phototransistors 241A2 and 242A2 are set to an OFF state. Consequently, the constant voltage power supply CVS and the cutoff circuit 230 are in a non-conductive state, and an L signal, serving as a safety signal, is input to the cutoff circuit 230.

[0094] In this case, the cut-off circuit 230 cuts off the signal path between the control unit 220 and the drive circuit 210. As a result, the inverter device 1 is able to maintain a state where the output of the drive signal from the control unit 220 to the drive circuit 210 is impossible.

[0095] Furthermore, as described above, if a safety signal (L signal) is input from at least one of the input circuits 241 and 242, the cut-off circuit 230 can cut off the signal path between the control unit 220 and the drive circuit 210. Therefore, for example, even if either of the normally closed switches built into the emergency stop switch ES fails and cannot output a safety signal, the cut-off circuit 230 can still cut off the signal path between the control unit 220 and the drive circuit 210 based on a safety signal from the other switch. Similarly, even if either of the input circuits 241 and 242 fails and cannot transmit a safety signal to the cut-off circuit 230, the cut-off circuit 230 can still cut off the signal path between the control unit 220 and the drive circuit 210 based on a safety signal transmitted by the other switch.

[0096] Thus, in the safety function operation mode, the input circuit 240 transmits the safety signals input from the input terminals EN1 and EN2 to the cut-off circuit 230. The cut-off circuit 230, based on the input safety signals, cuts off the signal path between the control unit 220 and the drive circuit 210. Therefore, the inverter device 1 can realize the safety function (STO) of stopping the power supply to the motor M based on the input safety signal based on the operation of the emergency stop switch ES.

[0097] <Safety function in non-operation mode>

[0098] like Figure 2 As shown, in the non-operation mode of the safety function, as described above, input terminals EN1 and EN2 are not used, and toggle switches 251 and 252 are set to the ON state.

[0099] If the switches 251 and 252 are set to the ON state, as described above, the signal lines on the output side of the input circuits 241 and 242 are set to be connected to the constant voltage power supply CVS, and thus maintained (fixed) at a relatively high potential. Therefore, the state of inputting the H signal from the input circuits 241 and 242 to the cut-off circuit 230 is maintained.

[0100] In this case, the disconnect circuit 230 maintains the signal path between the control unit 220 and the drive circuit 210 in a connected state, so that the control unit 220 can output a drive signal to the inverter circuit 130 through the drive circuit 210.

[0101] Thus, by setting switches 251 and 252 to the ON state, the signals input to the cutoff circuit 230 from the input circuits 241 and 242 can be fixed as H signals. Therefore, under the action of switch 250, the inverter device 1 can achieve a state where the safety function is disabled (non-operating mode). In other words, switch 250 can switch between a state where the safety function is enabled (operating mode) and a state where the safety function is disabled (non-operating mode).

[0102] [Other Implementation Methods]

[0103] Next, other implementation methods will be described.

[0104] The above implementation methods can be appropriately modified and altered.

[0105] For example, in the above embodiment, the emergency stop switch ES is connected to the input terminals EN1 and EN2 via signal lines, but it can be connected to other devices for outputting safety signals instead of the emergency stop switch ES. For example, a monitoring device for monitoring the operating status of the motor M can be connected to the input terminals EN1 and EN2.

[0106] Additionally, for example, in the above-described embodiments and variations, STO is provided as a safety function, but other safety functions may be provided in addition to STO or in addition to STO. Other safety functions include, for example, a safety stop function (SS) that controls the speed of the motor M while stopping it.

[0107] Furthermore, for example, in the above-described embodiments and variations, the switch 250 can be switched on and off via software based on user input, allowing the constant voltage power supply CVS and the signal lines on the output side of the input circuits 241 and 242 to be switched. For example, if a specified function code is input through the input section of the inverter device 1, the control circuit section 200 switches the switch 250 between ON and OFF.

[0108] Additionally, for example, in the above-described embodiments and variations, the switching switch 250 can switch the on / off state of the signal lines on the input side of the constant voltage power supply CVS and the input circuits 241, 242 instead of switching the on / off state of the signal lines on the output side of the constant voltage power supply CVS and the input circuits 241, 242. Specifically, the switching switches 251, 252 can be provided on the paths between the signal lines on the input side of the constant voltage power supply CVS and the input circuits 241, 242, i.e., the signal lines connected to the positive terminals of the photodiodes 241A1, 242A1.

[0109] Furthermore, for example, in the above-described embodiments and variations, although the switch 250 switches the connection state between the signal lines on the input side or output side of the constant voltage power supply CVS and the input circuit 240, it can also switch the connection state of the signal path between the input circuit 240 and the cut-off circuit 230. That is, in the above-described embodiments, although the switch 250 switches the reception of signals input through input terminals EN1 and EN2 based on whether the input circuit 240 can receive them, it can also switch the utilization of signals received by the input circuit 240 based on whether the cut-off circuit 230 can be used. Specifically, the switch 251 can be configured as a dual-throw type capable of switching the state between the signal lines connected to the output side of the input circuit 241 and the input lines of the cut-off circuit 230, and the state between the signal lines extending from the constant voltage power supply CVS and the input lines of the cut-off circuit 230. Furthermore, the switch 251 can be set in the operating mode to connect the signal line on the output side of the input circuit 241 to the input line of the cut-off circuit 230, and in the non-operating mode to connect the signal line extending from the self-regulating power supply CVS to the input line of the cut-off circuit 230. Similarly, the switch 252 can be configured as a dual-throw type capable of switching between the states of connecting the signal line on the output side of the input circuit 242 to the input line of the cut-off circuit 230 and between connecting the signal line extending from the self-regulating power supply CVS to the input line of the cut-off circuit 230. The switch 252 can also be set in the operating mode to connect the signal line on the output side of the input circuit 242 to the input line of the cut-off circuit 230, and in the non-operating mode to connect the signal line extending from the self-regulating power supply CVS to the input line of the cut-off circuit 230. Thus, in the operating mode, the safety signal (L signal) input through the input terminals EN1 and EN2 is transmitted from the input circuit 240 to the cut-off circuit 230, thereby enabling the inverter device 1 to achieve proper operation of the safety function. On the other hand, in non-operation mode, the signal of the input cut-off circuit 230 is fixed as the H signal, so that the inverter device 1 can properly maintain the state in which the safety function is not activated.

[0110] Furthermore, for example, in the above embodiment, although a switch 250 is provided for the input circuit 240 corresponding to the input terminals EN1 and EN2, the same switch can be provided for the input circuits corresponding to other input terminals. For example, the same switch can be provided for the input circuits corresponding to other input terminals that can be connected to signal lines that are input to signals used for other functions different from safety functions, or signals used to enable other functions.

[0111] In addition, for example, in the above embodiment, although the switch 250 fixes the signal output from the signal line on the output side of the input circuits 241 and 242 as an H signal, it can also be fixed as an L signal when the signal input from the outside is an H signal.

[0112] Alternatively, for example, the configuration of the above-described embodiment (input terminals EN1, EN2, input circuit 240, and switching switch 250, etc.) can be provided in other drive devices for driving load devices, different from inverter device 1, such as servo drivers (an example of drive devices).

[0113] [effect]

[0114] Next, refer to Figure 3 The function of the inverter device 1 (control circuit section 200) in this embodiment will be explained.

[0115] Figure 3 This is a diagram showing the configuration of the inverter device 1c of the comparative example. Specifically, Figure 3 This is a diagram showing the state of inverter unit 1c in a non-operation mode when the safety functions associated with motor M are not activated.

[0116] exist Figure 3 In this embodiment, the same reference numerals are given to the same constituent elements as those in the inverter device 1.

[0117] like Figure 3 As shown, the inverter device 1c in the comparative example differs from the inverter device 1 of this embodiment in that it does not have a switching switch 250. Therefore, in the non-operation mode of the safety function related to the motor M, the power supply terminal PLC and the input terminals EN1 and EN2 are connected by a shorting bar 250c. Alternatively, a jumper or the like can be used instead of the shorting bar 250c. As a result, the potential of the input terminals EN1 and EN2 is maintained at a relatively high state, allowing the inverter device 1c to input H signals to the input terminals EN1 and EN2. Therefore, the inverter device 1c maintains the state of inputting H signals from the input circuit 240 to the cutoff circuit 230, thereby enabling the non-operation mode of the safety function.

[0118] However, in the case of the inverter device 1c in the comparative example, for example, assuming the non-operation mode of the safety function, it is necessary to wire the shorting bar 250c, jumpers, etc. between the power supply terminal PLC and the input terminals EN1 and EN2 when shipping from the factory. Therefore, there is a possibility that the cost will increase due to the additional time required for wiring the shorting bar 250c, jumpers, etc.

[0119] Furthermore, in the case of the inverter device 1c in the comparative example, there is a risk of miswiring due to human error in wiring operations such as the short-circuit bar 250c and jumpers. As a result, there is a possibility that the inverter device 1c may not be able to properly implement the non-operating mode of the safety function.

[0120] Furthermore, in the case of the inverter device 1c in the comparative example, there is a possibility that the short-circuit bar 250c, jumpers, and other wiring may interfere with each other, thereby deteriorating the operability of the wiring operation. As a result, there is a possibility that the production efficiency of the inverter device 1c may decrease.

[0121] Furthermore, in the case of the inverter device 1c in the comparative example, the user needs to remove the shorting bar 250c when the safety function is in operation mode. Therefore, there is a possibility that the user may lose the shorting bar 250c.

[0122] In contrast, the inverter device 1 of this embodiment includes input terminals EN1 and EN2, an input circuit 240, and a switching switch 250. Specifically, the input terminals EN1 and EN2 are configured to connect to a specified signal line (e.g., a signal line extending from the emergency stop switch ES) for transmitting a specified signal (e.g., a safety signal). The input circuit 240 is connected to the input terminals EN1 and EN2 and is used to receive signals input through the input terminals EN1 and EN2. The switching switch 250 switches between a first state where the input circuit 240 cannot receive signals input through the input terminals EN1 and EN2, and a second state where the input circuit 240 can receive signals input through the input terminals EN1 and EN2. Alternatively, the switching switch 250 switches between a first state where the inverter device 1 (cutoff circuit 230) cannot utilize the signals received by the input circuit 240, and a second state where the inverter device 1 (cutoff circuit 230) can utilize the signals received by the input circuit 240.

[0123] Therefore, it is no longer necessary to use external wiring such as shorting bars 250c and jumpers to short-circuit the power supply terminal PLC and the input terminals EN1 and EN2. Thus, the inverter unit 1 can omit the external wiring connected to the assumed unused input terminals EN1 and EN2.

[0124] Furthermore, in this embodiment, the switch 250 can switch between a first state that maintains the potential of the input circuit 240 within a predetermined range (e.g., the range equivalent to the potential of the H signal) and a second state that allows the potential of the input circuit 240 to change according to the signals input from the input terminals EN1 and EN2. In other words, the switch 250 can switch between a first state of the input circuit 240 that is equivalent to a state where the input terminals EN1 and EN2 and the power supply terminal PLC are short-circuited, and a second state of the input circuit that is equivalent to a state where the input terminals EN1 and EN2 and the power supply terminal PLC are not short-circuited.

[0125] Therefore, specifically, the inverter device 1 uses a switching switch 250 to switch between a first state in which the input circuit 240 cannot receive signals input through the input terminals EN1 and EN2, and a second state in which it can receive signals input through the input terminals EN1 and EN2.

[0126] Furthermore, in this embodiment, the inverter device 1 includes a signal utilization unit (e.g., a cut-off circuit 230) that utilizes signals input through input terminals EN1 and EN2. The switch 250 can switch between a first state where the output line of the input circuit 240 and the input line of the signal utilization unit are disconnected, and a second state where the output line of the input circuit 240 and the input line of the signal utilization unit are connected.

[0127] Therefore, the inverter device 1 uses a switching switch 250, which specifically allows switching between a first state where the signal received by the input circuit 240 can be utilized and a second state where the signal received by the input circuit 240 cannot be utilized.

[0128] In addition, in this embodiment, signals for a specified function of the inverter device 1 can be input through the input terminals EN1 and EN2 via a specified communication line.

[0129] Therefore, the inverter device 1 can switch the switching switch 250 according to whether the signal related to the specified function is required.

[0130] In addition, in this embodiment, the first state is equivalent to the state in which the specified function (e.g., security function) is invalid, and the second state is equivalent to the state in which the specified function is valid.

[0131] Thus, the inverter device 1 can use the switching switch 250 to switch between a first state where a specified function is invalid (e.g., non-operating mode) and a second state where a specified function is valid (e.g., operating mode).

[0132] In addition, in this embodiment, the specified function may be a safety function (e.g., STO) of the load device (motor M) driven by the main circuit section 100 of the inverter device 1.

[0133] Thus, the inverter device 1 can use the switching switch 250 to switch between a first state (non-operating mode) where the safety function related to the motor M is invalid and a second state (operating mode) where it is valid.

[0134] In addition, in this embodiment, the switch 250 can be mechanically switched between the first state and the second state by the user's operation.

[0135] Therefore, the inverter device 1 can switch between the first state and the second state with a simpler configuration.

[0136] In addition, in this embodiment, in the first state, the potential of the input circuit 240 can be maintained in the range of the potential of a digital signal (H signal) that is equivalent to a high level.

[0137] Therefore, when the input terminals EN1 and EN2 are not used, the inverter device 1 can maintain the input circuit 240 from receiving L signals from the input objects of the input terminals EN1 and EN2.

[0138] In addition, in this embodiment, the switching switch 250 can switch the open / closed state of the connection line that connects a specified part of the input circuit 240 and a constant potential part (e.g., a constant voltage power supply CVS) whose potential is maintained within a specified range.

[0139] Therefore, specifically, the inverter device 1 can switch between a first state that maintains the potential of the input circuit 240 within a specified range and a second state that allows the potential of the input circuit 240 to change according to the signals input from the input terminals EN1 and EN2.

[0140] In this embodiment, the input circuit 241 may include an optocoupler 241A comprising a photodiode 241A1 connected to the input terminal EN1 via a signal line, and a phototransistor 241A2 connected to the output terminal via a signal line. Similarly, the input circuit 242 may include an optocoupler 242A comprising a photodiode 242A1 connected to the input terminal EN1 via a signal line, and a phototransistor 242A2 connected to the output terminal via a signal line. Furthermore, the switching switch 250 may be provided on the connection line between the constant potential section (constant voltage power supply CVS) and the signal line connecting the phototransistors 241A2, 242A2 and the output terminal.

[0141] Therefore, specifically, the inverter device 1 can switch between a first state that maintains the potential of the input circuit 240 within a specified range and a second state that allows the potential of the input circuit 240 to change according to the signals input from the input terminals EN1 and EN2.

[0142] The embodiments have been described in detail above, but the present invention is not limited to the specific embodiments. Various modifications and alterations can be made within the scope of the spirit of the claims.

[0143] Explanation of reference numerals in the attached figures

[0144] 1. Inverter unit (drive unit)

[0145] 1H Casing

[0146] 100 Main Circuit Section

[0147] 110 Rectifier Circuit

[0148] 120 smoothing circuit

[0149] 122 smoothing capacitor

[0150] 124 Reactor

[0151] 130 Inverter Circuit

[0152] 140 Charging Circuit

[0153] 142 Switch

[0154] 144 Charging Resistor

[0155] 200 Control Circuit Section

[0156] 210 drive circuit

[0157] 220 Control Department

[0158] 230 Cut-off circuit (signal utilization unit)

[0159] Input circuits 240, 241, and 242

[0160] 241A Optocoupler

[0161] 241A1 photodiode

[0162] 241A2 phototransistor

[0163] 241B Input Resistance

[0164] 242A Optical Coupler

[0165] 242A1 photodiode

[0166] 242A2 phototransistor

[0167] 242B Input Resistor

[0168] 250 Changeover Switch (Switching Unit)

[0169] 251, 252 toggle switch

[0170] ACIN (Analog Input Section)

[0171] ACOUT (Alternating Current Output Section)

[0172] CPS Commercial Power Supply

[0173] CVS Constant Voltage Power Supply (Constant Potential Section)

[0174] DCIN DC input section

[0175] EN1 and EN2 input terminals

[0176] IPS internal power supply

[0177] LT1, LT2 reactor connection terminals

[0178] M Motor (Load Device)

[0179] N negative DC terminal

[0180] NL negative line

[0181] P Positive DC terminal

[0182] PL positive line

[0183] PLC power terminals

[0184] R, S, T AC input terminals

[0185] U, V, W AC output terminals

Claims

1. A driving device, comprising: An inverter circuit includes a semiconductor switching element, which converts DC power into AC power and outputs it to a load device through the switching action of the semiconductor switching element. Input terminals, which can be connected to specified signal lines; An input circuit, which is connected to the aforementioned input terminals, is used to receive signals input through the aforementioned input terminals; A constant potential section provides a potential that is maintained within a specified range; The drive circuit, under the control of the control unit, outputs a drive signal for ON / OFF driving the semiconductor switching element to the inverter circuit. The control unit generates the drive signal and outputs the drive signal to the inverter circuit through the drive circuit, thereby operating the inverter circuit to drive and control the load device. The cut-off circuit receives an input signal and cuts off the signal path between the control unit and the drive circuit based on the input signal, thereby cutting off the transmission of the drive signal from the control unit to the drive circuit. as well as The switching unit switches between a first state and a second state. In the first state, the constant potential unit can provide the potential to the cut-off circuit as the input signal. In the second state, the input circuit can provide the signal input through the input terminal to the cut-off circuit as the input signal.

2. The driving device according to claim 1, wherein, The load device mentioned above is an electric motor.

3. The driving device according to claim 1, wherein, The above-mentioned range refers to the range of potentials equivalent to a high-level digital signal.

4. The driving device according to claim 1, wherein, The input circuit described above has an optocoupler, which includes a photodiode connected to the input terminal and a phototransistor connected to the output terminal of the cut-off circuit described above.

5. The driving device according to any one of claims 1 to 3, wherein, Signals used to control the specified functions of the aforementioned drive device are input to the aforementioned input terminals via the specified signal lines.

6. The driving device according to claim 5, wherein, The first state described above is equivalent to the state where the function is invalid as specified above, and the second state described above is equivalent to the state where the function is valid as specified above.

7. The driving device according to claim 6, wherein, The functions specified above are the safety functions of the load device driven by the main circuit section of the drive unit.

8. The drive device according to any one of claims 1 to 3, wherein, The aforementioned switching unit is a switch that mechanically switches between the first state and the second state through user operation.

9. The drive device according to any one of claims 1 to 3, wherein the switching unit is a slide switch that mechanically switches between the first state and the second state by a user's sliding operation.

Images