Industrial device and system

Abstract

An industrial device (1) is specified, comprising - a non-isolated USB interface (2) with a USB supply voltage connection (3) and a USB ground connection (4), - an internal supply voltage connection (5), - an internal ground connection (6), - a reverse polarity detector (7) comprising a first transistor device (8), and - an electrical current path disconnector (9) comprising a second transistor device (10), wherein - the reverse polarity detector (7) and the electrical current path disconnector (9) are connected to the non- isolated USB interface (2) and to the internal supply voltage connection (5) and the internal ground connection (6). Furthermore, a system is specified.

Description

[0001] Description

[0002] INDUSTRIAL DEVICE AND SYSTEM

[0003] An industrial device is provided. In addition, a system is provided .

[0004] Generally, damage can occur if typical devices containing a non-isolated interface are reverse-powered from a grounded source, e.g., if a current flows through a typical nonisolated USB interface of typical devices to a grounded side of the power source.

[0005] An object to be achieved is to provide an industrial device which is particularly safe. Furthermore, a system comprising such an industrial device is provided.

[0006] This object is achieved by the subject-matter of the independent claims. Advantageous embodiments, implementations and further developments are the subject-matter of the respective dependent claims.

[0007] An industrial device is specified. The industrial device is, for example, powered with 24 V DC, or exemplarily with 12 V DC to 24 V DC. The industrial device has, for example, a digital input and / or an analog input to support different functionalities. The industrial device has, for example, a display element.

[0008] According to at least one embodiment, the industrial device comprises a non-isolated USB interface with a USB supply voltage connection and a USB ground connection. Exemplarily, a non-isolated USB interface refers to a Universal Serial Bus, USB, interface which has no electrical isolation between the corresponding USB connections and the rest of a circuitry of the industrial device.

[0009] Exemplarily, the non-isolated USB interface is configured to be connected to an external computing device. In particular, the USB supply voltage connection is configured to be connected to a corresponding supply voltage connection of the external computing device. In particular, the external computing device can provide a first voltage to the industrial device, in particular, the non-isolated USB interface, exemplarily via the USB supply voltage connection. The first voltage is, for example, approximately 5 V DC.

[0010] In particular, the USB ground connection is configured to be connected to a corresponding ground connection of the external computing device. For example, the ground connection of the external computing device is an internal ground of the external computing device, which is in particular, connected to a Protective Earth (PE) .

[0011] In particular, the industrial device is a small industrial device. A "small industrial device" means that the industrial device comprises the non-isolated USB interface and a nonisolated internal power supply. By using the non-isolated USB interface, the industrial device is in particular, comparatively inexpensive and / or simple regarding its design, since many modern microcontroller contain an internal USB transceiver .

[0012] According to at least one embodiment, the industrial device comprises an internal supply voltage connection. Exemplarily, the industrial device is configured to be connected to an external power supply. In particular, the internal supply voltage connection is configured to be connected to a first connection, exemplarily an external supply voltage connection, of the external power supply. In particular, the external power supply can provide a second voltage to the industrial device via the internal supply voltage connection. The second voltage is, for example, approximately 12 V DC or 24 V DC. In particular, the external power supply provides the second voltage to the industrial device and additionally the external computing device additionally provides the first voltage to the industrial device.

[0013] In particular, the industrial device can be connected to the external power supply and the external computing device at the same time.

[0014] According to at least one embodiment, the industrial device comprises an internal ground connection. In particular, the internal ground connection is configured to be connected to a second connection of the external power supply. For example, the second connection of the external power supply can be connected to Protective Earth, PE. The power supply can be even of Protective Extra-Low Voltage, PELV, type, in which case the second connection of the power supply is always connected to PE.

[0015] Exemplarily, the USB supply voltage connection and the USB ground connection and / or the internal supply voltage connection and the internal ground connection are configured to transmit analog inputs, e.g., corresponding to a supply voltage and / or a ground. Exemplarily, the industrial device is configured to be provided with digital inputs or digital inputs and / or analog inputs. For example, an input simulator or an input test device can be connected to the industrial device. The input simulator or the input test device can be provided with power from the external power supply or, alternatively, from the USB supply voltage connection which, for this purpose, must be fed back to the supply connection of the industrial device .

[0016] According to at least one embodiment, the industrial device comprises a reverse polarity detector comprising a first transistor device. The reverse polarity detector is in particular, configured to detect a reverse polarity condition .

[0017] According to at least one embodiment, the industrial device comprises an electrical current path disconnector comprising a second transistor device. The electrical current path disconnector is in particular, configured to disconnect the unwanted current path dependent on the detection of the reverse polarity condition.

[0018] The first transistor device and the second transistor device each comprise, for example, a bipolar junction transistor, BJT, and / or a field-effect transistor, FET. Exemplarily, the first transistor device and the second transistor device each has a first terminal, a second terminal and a third terminal.

[0019] According to at least one embodiment, the reverse polarity detector and the electrical current path disconnector are connected to the non-isolated USB interface and to the internal supply voltage connection and the internal ground connection . Exemplarily, the reverse polarity detector and / or the electrical current path di sconnector are directly connected to the USB supply voltage connection . Exemplarily, the reverse polarity detector and / or the electrical current path disconnector are directly connected to the USB ground connection .

[0020] An idea o f the industrial device described herein is to provide the industrial device with a low-cost protection means being formed of the electrical current path di sconnector and the reverse polarity detector . This low-cost protection means i s conf igured to protect the industrial device against reverse polarity supply from a grounded source to avoid damage o f the industrial device and / or f ire danger in the system, and against damage through bypass ing o f a standard reverse polarity protection diode over a power feedback circuit intended to supply an input s imulator from the USB supply voltage .

[0021] Such small industrial devices advantageous ly have a low-cost but fast enough connection to a PC or notebook for data trans fer - in particular, the non- isolated USB interface . Moreover, such industrial devices can be powered from the non- isolated USB interface , which would al low to perform development and commis sioning even i f the device supply voltage o f 12 V and / or 24V DC is not connected .

[0022] According to at least one embodiment of the industrial device , the reverse polarity detector is directly connected to a ground line connecting the USB ground connection and the internal ground connection . According to at least one embodiment of the industrial device, the first transistor device and the second transistor device are directly connected to a ground line connecting the USB ground connection and the internal ground connection. For example, the electrical current path disconnector is arranged between the USB ground connection and the internal ground connection .

[0023] According to at least one embodiment of the industrial device, a first resistor is arranged between the first transistor device and the internal ground connection. Exemplarily, the first resistor is comprised by the reverse polarity detector.

[0024] According to at least one embodiment of the industrial device, a second resistor is arranged between the second transistor device and the internal supply voltage connection. Exemplarily, the second resistor is comprised by the electrical current path disconnector.

[0025] According to at least one embodiment of the industrial device, each of the first transistor device and the second transistor device has a second terminal, a third terminal, and a first terminal. For a bipolar junction transistor, the first terminal corresponds to a base, the second terminal corresponds to an emitter and the third terminal corresponds to a collector. For a field-effect transistor, the first terminal corresponds to a gate, the second terminal corresponds to a source and the third terminal corresponds to a drain.

[0026] According to at least one embodiment of the industrial device, each second terminal is connected to the USB ground connection. In particular, the second terminal of the first transistor device and the second terminal of the second transistor device are directly connected to the USB ground connection .

[0027] According to at least one embodiment of the industrial device, the first terminal of the first transistor device is connected to the internal ground connection. In particular, the first terminal of the first transistor device is connected to the first resistor and the first resistor is connected to the internal ground connection. This means that the first transistor device is connected to the internal ground connection through the first resistor, wherein the first transistor device and the first resistor form the reverse polarity detector.

[0028] According to at least one embodiment of the industrial device, the third terminal of the second transistor device is connected to the internal ground connection.

[0029] According to at least one embodiment of the industrial device, the first terminal of the second transistor device is connected to the internal supply voltage connection. In particular, the first terminal of the second transistor device is connected to the second resistor and the second resistor is connected to the internal supply voltage connection. This means that the second transistor device is connected to the internal supply voltage connection through the second resistor, wherein the second transistor device and the second resistor form the electrical current path disconnector . According to at least one embodiment of the industrial device, the third terminal of the first transistor device is connected to the first terminal of the second transistor device. In particular, the third terminal of the first transistor device is connected to a connection line connecting the second transistor device and the second resistor .

[0030] According to at least one embodiment of the industrial device, a first diode is connected between the first terminal of the first transistor device and the USB ground connection. In particular, the first diode is connected between the first terminal and the second terminal of the first transistor device. The first diode has an anode side and a cathode side. Exemplarily, the anode side of the first diode is connected to the USB ground connection, in particular, to the second terminal of the first transistor device and the cathode side is connected to the first terminal of the first transistor device .

[0031] According to at least one embodiment of the industrial device, a second diode is connected between the second terminal of the second transistor device and the first terminal of the second transistor. Exemplarily, the second diode is connected between the second terminal of the second transistor device and the third terminal of the first transistor device. The second diode has an anode side and a cathode side. Exemplarily, the anode side of the second diode is connected to the second terminal of the second transistor device and the cathode side is connected to the first terminal of the second transistor device. For example, the first diode and the second diode are each formed of a Zener diode and / or a simple diode, e.g., a standard diode.

[0032] According to at least one embodiment of the industrial device, a capacitor is connected between the first terminal and the second terminal of the first transistor device. Exemplarily, the capacitor is connected to the first terminal of the first transistor device and the cathode side of the first diode. For example, the capacitor is connected to the second terminal of the first transistor device and the anode side of the first diode. In particular, the capacitor is connected in parallel with the first diode.

[0033] According to at least one embodiment of the industrial device, the first transistor device is directly connected to a ground line connecting the USB ground connection and the internal ground connection. For example, the reverse polarity detector is arranged between the ground line and the internal supply voltage connection.

[0034] Exemplarily, a second terminal of the first transistor device is connected to the USB ground connection. For example, a first terminal of the first transistor device is connected to the internal supply voltage connection. For example, a third terminal of the first transistor device is connected to the USB supply voltage connection.

[0035] According to at least one embodiment of the industrial device, the second transistor device is directly connected to a voltage line connecting the USB supply voltage connection and the internal supply voltage connection. For example, the electrical current path disconnector is arranged between the USB supply voltage connection and the internal supply voltage connection .

[0036] Exemplarily, a second terminal of the second transistor device is connected to the USB supply voltage connection. For example, a third terminal of the second transistor device is connected to the internal supply voltage connection. For example, a first terminal of the second transistor device is connected to the third terminal of the first transistor device .

[0037] According to at least one embodiment of the industrial device, a first diode is arranged between an internal power supply and the internal supply voltage connection. In particular, the industrial device comprises the internal power supply. In particular, the internal power supply can provide a third and / or a fourth voltage to the industrial device by the internal power supply. The third and / or the fourth voltage is, for example, approximately 5 V DC and / or 3 V DC.

[0038] A cathode side of the first diode is connected to the internal power supply and an anode side of the first diode is connected to the internal supply voltage connection.

[0039] According to at least one embodiment of the industrial device, a second diode is arranged between a third terminal of the second transistor device and the internal supply voltage connection. Exemplarily, a cathode side of the second diode is connected to the internal supply voltage connection and an anode side of the second diode is connected to the third terminal of the second transistor device. According to at least one embodiment of the industrial device, a third diode is arranged between a second terminal and a first terminal of the first transistor device. Exemplarily, the third diode is connected to the ground line. In particular, the third diode is connected to the second terminal of the first transistor device through the ground line .

[0040] According to at least one embodiment of the industrial device, a first resistor is arranged between the first terminal of the first transistor device and the internal supply voltage connection.

[0041] According to at least one embodiment of the industrial device, a second resistor is arranged between the first terminal of the first transistor device and the USB supply voltage connection.

[0042] According to at least one embodiment of the industrial device, a third resistor is arranged between the third terminal of the second transistor device and the USB supply voltage connection.

[0043] According to at least one embodiment of the industrial device, at least one of the first transistor device and the second transistor device comprises a metal oxide semiconductor device. Exemplarily, the first transistor device and / or the second transistor device is a metal-oxide- semiconductor field-effect transistor, MOSFET.

[0044] The MOSFET has, for example, a parasitic body diode between the third terminal and the second terminal, i.e., between the drain and the source terminal. The parasitic body diode is intrinsic to the device technological structure.

[0045] According to at least one embodiment of the industrial device, at least one of the first transistor device and the second transistor device comprises a bipolar transistor. The bipolar transistor is a npn or a pnp transistor.

[0046] According to at least one embodiment of the industrial device, the internal supply voltage connection and the internal ground connection are each configured to be connected to an external power supply.

[0047] According to at least one embodiment of the industrial device, the USB supply voltage connection and the USB ground connection are each configured to be connected to an external computing device.

[0048] Furthermore, a system is specified. The system can comprise or comprises the industrial device described herein.

[0049] Therefore, all features and embodiments disclosed in connection with the system are also disclosed in connection with the industrial device and vice versa.

[0050] According to at least one embodiment, the system comprises the industrial device described herein.

[0051] According to at least one embodiment, the system comprises an external power supply connected to the industrial device.

[0052] According to at least one embodiment, the system comprises an external computing device connected to the industrial device. Exemplarily, a simulator can be connected to the industrial device. Exemplarily, the industrial device comprises digital inputs or analog and digital inputs configured to be connected to the simulator. The simulator comprises, for example, switches for the digital inputs and potentiometers for the analog inputs. Advantageously, the simulator allows a customer to easily simulate a related functionality, before installing the industrial device in the final application. The simulator can be provided with power by the external power supply and / or the external computing device through the non-isolated USB interface.

[0053] Exemplary embodiments of the device and the system are explained in more detail below with reference to the Figures.

[0054] Figures 1 and 6 each shows a system with an industrial device according to an exemplary embodiment.

[0055] Figures 2, 3, 4, 5, 7 and 8 each show an industrial device according to an exemplary embodiment.

[0056] Elements of the same structure or function are marked with the same reference signs throughout the Figures.

[0057] The industrial device 1 according to Figure 1 comprises a non-isolated USB interface 2 with a USB supply voltage connection 3 and a USB ground connection 4, an internal supply voltage connection 5 and an internal ground connection 6. The industrial device 1 is configured to be connected to an external power supply 23, which has a first connection 24, exemplarily an external supply voltage connection, of the external power supply 23, and a second connection 25, exemplarily an external ground connection, of the external power supply 23. The second connection 25 of the external power supply 23 can be externally connected to e.g., a Protective Earth 27, PE.

[0058] Further, the non-isolated USB interface 2 is configured to be connected to an external computing device 26, which has a corresponding supply voltage connection of the external computing device 26 and a corresponding ground connection of the external computing device 26.

[0059] If the external power supply 23 is connected to the industrial device 1 with the terminals' polarity reversed, a short-circuit occurs through the external PE connection. Without appropriate protection measures, the devices can be damaged .

[0060] Advantageously, a reverse polarity detector 7 comprising a first transistor device 8, and an electrical current path disconnector 9 comprising a second transistor device 10 are connected to the non-isolated USB interface 2. In particular, the reverse polarity detector 7 and the electrical current path disconnector 9 are connected directly at a ground line 18 connecting the USB ground connection 4 and the internal ground connection 6.

[0061] The system 28 comprising the industrial device 1 is thus advantageously protected from short circuit events. This means that the reverse polarity condition is detected by the reverse polarity detector 7, and then the unwanted current path is disconnected by the electrical current path disconnector 9. The industrial device 1 according to Figure 2 comprises a first resistor 15 arranged between the first transistor device 8 and the internal ground connection 6, and a second resistor 16 arranged between the second transistor device 10 and the internal supply voltage connection 5. In particular, the first transistor device 8 and the second transistor device 10 are each an n-channel metal oxide semiconductor device. Each of the first transistor device 8 and the second transistor device 10 has a second terminal 19, e.g., being a source, a third terminal 20, e.g., being a drain, and a first terminal 21, e.g., being a gate.

[0062] The source of the first transistor devices 8 is connected to the USB ground connection 4 and the gate of the first transistor device 8 is connected through the first resistor 15 to the internal ground connection 6 as the reverse polarity detector 7. The second transistor device 10 as the electrical current path disconnector 9 has its drain connected to the internal ground connection 6 and its source connected to the USB ground connection 4. The gate of the second transistor device 10 is connected to the internal supply voltage connection 5 through the second resistor 16 and to the drain of the first transistor device 8, which in particular, is configured to control the "disconnecting" second transistor device 10.

[0063] In the case of applying a reverse polarity power to the supply terminals, i.e., the internal supply voltage connection 5 and the internal ground connection 6, a negative pole being connected to the PE by the USB ground connection 4, the internal ground connection 6 becomes positive relative to the USB ground connection 4. Thus, the gate potential of the first transistor device 8 rises relative to the source and the first transistor device 8 opens, bringing through its drain the gate of the second transistor device 10 to its source potential. This means that VGS= 0, the second transistor device 10 is turned off, and no current flows from the internal ground connection 6 to the USB ground connection 4, thus preventing a short-circuit.

[0064] In particular, in real circuits there are several aspects which must be further considered. Exemplarily, the first transistor device 8 and the second transistor device 10 according to Figure 3 are each formed of a MOSFET. Each MOSFET has in particular, a parasitic body diode between the drain and the source, i.e., a first body diode 11 and a second body diode 12.

[0065] Particularly, the parasitic body diode's anode is connected to the source and its cathode to the drain, in each case, in particular, for the n-channel metal oxide semiconductor devices .

[0066] Additionally, the gate-to-source voltage VGSis limited, mostly to ± 20 V, so that a protection circuit is necessary. In particular, the industrial device 1 according to Figure 3 comprises, in comparison to the industrial device 1 of Figure 2, a first diode 13 and a second diode 14, which are each formed, for example, by a Zener diode. Alternatively a corresponding voltage divider (not shown in the Figures) can be used.

[0067] Exemplarily, a potential of the USB ground connection 4 cannot be defined at a power-up when the industrial device 1 is correctly powered through other connections such as USB signals and / or a voltage VBUs at the USB supply voltage connection 3, a rising positive potential up to a voltage Usat the internal supply voltage connection 5 could be expected, which is in particular, limited by the second body diode of the second transistor device 10 to the forward voltage drop of, for example, about 0.7 V.

[0068] The industrial device 1 further comprises a capacitor 29, which is arranged between the gate and the source of the first transistor device 8. When the power is correctly applied to the industrial device 1, the capacitor 29 is configured to be slowly charged through the first resistor 15, which keeps the first transistor device 8 turned off at the beginning. In particular, this allows the second transistor device 10 to be directly turned on by the second resistor 16. The internal ground connection 6 and the USB ground connection 4 are particularly connected, and the first transistor device 8 remains turned off.

[0069] In contrast to the exemplary embodiments of Figures 2 and 3, in Figure 4 the reverse polarity detector 7, e.g., the first transistor device 8, is formed by a bipolar npn transistor. The first diode 13 is a simple diode.

[0070] The first transistor and the second transistor in the exemplary embodiment according to Figure 5 both comprise bipolar npn transistors, in contrast to Figures 2, 3 and 4. The first diode 13 and the second diode 14 are each a simple diode .

[0071] A voltage drop over the second transistor device 10, VCESat of e.g., about 0.2 V, is in this case acceptable since the USB data signals are digital differential signals. Particularly, due to the different potentials between the internal ground connection 6 and the USB ground connection 4 in case of reversed polarity supply, further protection means, which are not described here in detail, can be provided for the USB supply voltage connection and the USB data signals.

[0072] In industrial device 1 according to Figure 6, the reverse polarity detector 7 is directly connected to a ground line 18 connecting the USB ground connection 4 and the internal ground connection 6, and the electrical current path disconnector 9 is directly connected to a voltage line connecting the USB supply voltage connection 3 and the internal supply voltage connection 5, in contrast to the exemplary embodiments of Figures 1, 2, 3, 4 and 5.

[0073] A power feedback from the USB supply voltage connection 3 to the internal supply voltage connection 5 is achieved, wherein the electrical current path disconnector 9 is placed between the internal supply voltage connection 5, e.g., providing the voltage Us, through a second diode 14 and, e.g., a 5 V, USB supply voltage VBUs from the USB supply voltage connection 3, and the reverse polarity detector 7 is configured to sense the supply voltage Usfrom the internal supply voltage connection 5.

[0074] The internal supply voltage connection can be connected to a digital input 30, exemplarily through a simulator.

[0075] In particular, in the case of a reversed polarity of the external power supply 23, detected by reverse polarity detector 7, the electrical current path disconnector 9 is configured to block the flow of the reverse current from the

[0076] USB supply voltage connection 3 through the second diode 14.

[0077] Advantageously, a simple low-cost circuit with transistors is used to implement the two blocks, reverse polarity detector 7 and electrical current path disconnector 9. The second transistor device 10 of the electrical current path disconnector 9 is, for example, a p-channel metal oxide semiconductor device, PMOS, according to the exemplary embodiment of Figure 7, in particular, to minimize a voltage loss. Particularly preferably, the first transistor device 8 of the reverse polarity detector 7 is a bipolar npn transistor. The bipolar npn transistor is particularly well suited due to a lower drive level, e.g., when considering a relatively low 5 V USB voltage.

[0078] Exemplarily, if the second transistor device 10 is formed of a bipolar transistor, the second transistor device 10 is formed of a bipolar pnp transistor.

[0079] According to Figure 7, the bipolar npn transistor is connected with the base through the first resistor 15 to the voltage Usof the internal supply voltage connection 5. A third diode 31 is configured to protect the base-emitter junction against negative voltages exceeding a maximum allowed value, which is, for example, approximately -5 V. The collector of the first transistor device 8 is configured to drive the gate of the second transistor device 10 with a third resistor 17 connected between the gate of the second transistor device and the, e.g., 5 V, USB voltage VBUs of the USB supply voltage connection 3. The second resistor 16 connected from the base of the first transistor device 8 to the USB supply voltage connection 3 is configured to ensure that the first transistor device 8 is turned on at a first time if a voltage Usof the internal supply voltage connection 5 is not present and VBUSis applied, so that the second transistor device 10 can be opened to forward the USB voltage VBUBto the Usinput through the second diode 14, e.g., being a Schottky-type diode, to minimize the voltage drop. With almost 5 V, approximately 4.5 V, at the supply input Us, the first transistor device 8 is configured to be further kept in the on-state. The first diode 13 is a typical reverse polarity protection diode for the internal circuits.

[0080] If the supply voltage Usof the internal supply voltage connection 5 is present, the first transistor device 8 is configured to be turned on and brings the gate of the second transistor device 10 to approximately ground potential. In particular, the second transistor device 10 is configured to be turned on if VBUSis present, e.g., directly from the USB supply voltage connection 3 or through other circuits from the internal power supply 22. In this case a state of the second transistor device 10 is irrelevant since the second diode 14 is blocked by the higher cathode voltage at the internal supply voltage connection 5.

[0081] If a negative voltage is applied to the internal supply voltage connection 5, e.g., a reverse polarity, the first transistor device 8 is turned off and the gate and the source of the second transistor device 10 are brought to the same potential, e.g., VBUs, by the third resistor 17, so that the second transistor device 10 is turned off and prevents an uncontrolled current flow from the USB supply voltage connection 3 to the internal supply voltage connection 5. The second body diode of the second PMOS transistor device 10 connected with the anode to the drain and the cathode to the source is blocked as well. This is representative, advantageously, of the electrical current disconnect function .

[0082] In contrast to the exemplary embodiment of Figure 7, the first transistor device 8 is a MOSFET according to the exemplary embodiment of Figure 8. Components of the gate of the first transistor device 8 are carefully chosen due to a higher threshold voltage VGs(th>, the value of which can widely vary, depending on the transistor type. A gate protection diode, in particular, the third diode 31, is formed exemplarily as a Zener diode. The third diode 31 is chosen, for example, to have a not too high voltage, for example, approximately 5.6 V, to reduce the direct current flow between the internal supply voltage connection 5 and the USB supply voltage connection 3 through the first resistor 15 and the second resistor 16.

[0083] Alternatively, the second transistor device 10 can be a bipolar pnp transistor.

[0084] This patent application claims the priority of the German patent application 10 2024 106 615.6, the disclosure of which is hereby incorporated by reference.

[0085] Reference signs

[0086] 1 industrial device

[0087] 2 non-i solated USB interface

[0088] 3 USB supply voltage connection

[0089] 4 USB ground connection

[0090] 5 internal supply voltage connection

[0091] 6 internal ground connection

[0092] 7 reverse polarity detector

[0093] 8 f irst trans istor device

[0094] 9 electrical current path disconnector

[0095] 10 second transi stor device

[0096] 11 f irst body diode

[0097] 12 second body diode

[0098] 13 f irst diode

[0099] 14 second diode

[0100] 15 f irst res istor

[0101] 16 second resi stor

[0102] 17 third res istor

[0103] 18 ground line

[0104] 19 second terminal

[0105] 20 third terminal

[0106] 21 f irst terminal

[0107] 22 internal power supply

[0108] 23 external power supply

[0109] 24 f irst connection

[0110] 25 second connection

[0111] 26 external computing device

[0112] 27 protective earth, PE

[0113] 28 system

[0114] 29 capacitor

[0115] 30 digital input

[0116] 31 third diode

Claims

Claims1. Industrial device (1) , comprising- a non-isolated USB interface (2) with a USB supply voltage connection (3) and a USB ground connection (4) ,- an internal supply voltage connection (5) ,- a internal ground connection (6) ,- a reverse polarity detector (7) comprising a first transistor device (8) , and- an electrical current path disconnector (9) comprising a second transistor device (10) , wherein- the reverse polarity detector (7) and the electrical current path disconnector (9) are connected to the nonisolated USB interface (2) and to the internal supply voltage connection (5) and the internal ground connection (6) .

2. Industrial device (1) according to claim 1, wherein- the reverse polarity detector (7) is directly connected to a ground line (18) connecting the USB ground connection (4) and the internal ground connection (6) .

3. Industrial device (1) according to claim 2, wherein- the first transistor device (8) and the second transistor device (10) are directly connected to the ground line (18) connecting the USB ground connection (4) and the internal ground connection (6) .

4. Industrial device (1) according to any one of claims 1 to 3, wherein- a first resistor (15) is arranged between the first transistor device (8) and the internal ground connection (6) , and- a second resistor (16) is arranged between the second transistor device (10) and the internal supply voltage connection ( 5 ) .

5. Industrial device (1) according to any one of claims 1 to 4, wherein- each of the first transistor device (8) and the second transistor device (10) has a second terminal (19) , a third terminal (20) , and a first terminal (21) ,- each second terminal (19) is connected to the USB ground connection ( 4 ) ,- the first terminal (21) of the first transistor device (8) is connected to the internal ground connection (6) ,- the third terminal (20) of the second transistor device(10) is connected to the internal ground connection (6) ,- the first terminal (21) of the second transistor device(10) is connected to the internal supply voltage connection (5) , and- the third terminal (20) of the first transistor device (8) is connected to the first terminal (21) of the second transistor device (10) .

6. Industrial device (1) according to claim 5, wherein- a first diode (13) is connected between the first terminal(21) of the first transistor device (8) and the USB ground connection (4) , and- a second diode (14) is connected between the second terminal (19) of the second transistor device (10) and the first terminal (21) of the second transistor device (10) .

7. Industrial device (1) according to any one of claims 5 and6, wherein- a capacitor (29) is connected between the first terminal(21) and the second terminal (19) of the first transistor device ( 8 ) .

8. Industrial device (1) according to claim 2, wherein- the first transistor device (8) is directly connected to the ground line (18) connecting the USB ground connection (4) and the internal ground connection (6) , and- the second transistor device (10) is directly connected to a voltage line connecting the USB supply voltage connection (3) and the internal supply voltage connection (5) .

9. Industrial device (1) according to claim 8, wherein- a first diode (13) is arranged between an internal power supply (22) and the internal supply voltage connection (5) ,- a second diode (14) is arranged between a third terminal (20) of the second transistor device (10) and the internal supply voltage connection (5) , and- a third diode (31) is arranged between a second terminal (19) and a first terminal (21) of the first transistor device (8) .

10. Industrial device (1) according to claim 9, wherein- a first resistor (15) is arranged between the first terminal (21) of the first transistor device (8) and the internal supply voltage connection (5) ,- a second resistor (16) is arranged between the first terminal (21) of the first transistor device (8) and the USB supply voltage connection (3) , and- a third resistor (17) is arranged between the first terminal (21) of the second transistor device (10) and the USB supply voltage connection (3) .

11. Industrial device (1) according to any one of claims 1 to10, wherein- at least one of the first transistor device (8) and the second transistor device (10) comprises a metal oxide semiconductor device.

12. Industrial device (1) according to any one of claims 1 to11, wherein- at least one of the first transistor device (8) and the second transistor device (10) comprises a bipolar transistor.

13. Industrial device (1) according to any one of claims 1 to12, wherein- the internal supply voltage connection (5) and the internal ground connection (6) are each configured to be connected to an external power supply (23) , and- the USB supply voltage connection (3) and the USB ground connection (4) are each configured to be connected to an external computing device (26) .

14. System (28) , comprising- an industrial device (1) according to any one of claims 1 to 13,- an external power supply (23) connected to the industrial device ( 1 ) , and- an external computing device (26) connected to the industrial device (1) .

Images