KR20150139798A - Detection device and method for detecting an interruption in a supply line between the detection device and an electrical load - Google Patents

Abstract

The present invention relates to a detection device (100) for detecting an interruption (160) in a supply line (115a) between the detection device (100) and an electrical load (110). The detection device (100) includes a switching unit (135a) connected between a supply voltage port (140) and the supply line (115a). The switching unit (135a) includes a controllable switching member (S1a) and a diode (D1a) connected to the switching member (S1a) in parallel. A cathode of the diode is connected to the supply voltage port (140), and an anode of the diode is connected to the supply line (115a) with electrical conductivity. Also, the detection device (100) includes a voltage supply unit (CP) which can be connected to the supply line (115a) for supplying a test voltage, and the test voltage is higher than a voltage applied to the supply voltage port (140) during operation of the detection device (100). The detection device (100) includes a detection unit (DS). And the detection unit is formed to detect the interruption (160) in case the switching member (S1a) is located at an open state, and the voltage detected on the supply line (115a) is higher than the voltage applied to the supply voltage port (140), and/or a potential of the supply line (115a) is higher than a potential of the supply voltage port (140).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a detection device and a method for detecting interruption in a supply line between a detection device and an electric load device,

The present invention relates to a detection device for detecting interruption in a supply line between a detection device and an electrical load device, a corresponding method, a corresponding control device, and a corresponding computer program.

For example, in the operation of an electric load device such as an electric motor, the interruption of the supply line of the electric motor can be detected mostly only through the failure of the electric motor, or the electric motor has a plurality of windings or phases, If it is interrupted, it can be detected through vibration or noise during operation of the electric motor.

Based on this approach, according to the independent claims, by means of the approach proposed here, not only the detection device for detecting the interruption in the supply line between the detection device and the electric load device, but also the detection device for detecting the interruption in the supply line between the detection device and the electric load device A method for detecting interception in a computer, a control device using such a method, and finally a corresponding computer program are also proposed. Preferred embodiments are set forth in the respective dependent claims and the following description.

In the present application, a detection device for detecting interruption in a supply line between a detection device and an electric load device is proposed, and the detection device has the following features:

A switching unit connected between the supply voltage terminal and the supply line, the switching unit comprising a controllable switching element and a diode connected in parallel to the switching element, the cathode of the diode being connected to the supply voltage terminal and the anode of the diode A switching unit electrically connected to the supply line;

A voltage supply unit capable of being connected to the supply line for supplying the test voltage, the test voltage being higher than the voltage applied on the supply terminal in operation of the detection device;

The blocking is detected when the switching element is located in the open state, the voltage detected on the supply line is greater than the voltage applied on the supply voltage terminal, and / or the potential on the supply line is higher than the potential on the supply voltage terminal And a detection unit formed to detect a signal.

The supply line may refer to a line that supplies electrical energy to the electrical load device for the operation of the electrical load device. The supply voltage terminal may refer to a connection point, and a voltage is applied between such a connection point and the ground terminal to supply electrical energy for operation of the electrical load device. The voltage supply unit may mean a unit that supplies a test voltage having a voltage higher than the voltage applied on the supply voltage terminal in operation of the electric load device with respect to the ground potential. For example, the voltage supply unit may be configured to supply a voltage applied on the supply voltage terminal, and to supply the voltage as a test voltage. The open state of the switching member may mean a state in which two contacts of the switching member do not conduct electricity, i.e., mutually electrically insulated.

The approach proposed here is based on the recognition that a higher potential than the supply voltage terminal is formed between the supply line and the electrical load device of the detection device during shutdown of the supply line. As a result, a current that can be detected based on the voltage difference between the supply line and the supply voltage terminal flows from the supply line to the supply voltage terminal via the diode. From this, it can be seen that there is an interruption of the supply line. Conversely, if the supply line is not blocked, the current starts from the supply voltage terminal and flows to the electrical load device via the switching member and the supply line, and the electrical potential on the supply line becomes lower than at the supply voltage terminal. Thus, through the comparison of the voltage on the supply voltage terminal (e.g., in relation to the ground potential) and the voltage on the supply line (e.g., in relation to the ground potential as well), the presence or absence of interruption of the supply line between the detection device and the electrical load device is very simple . Therefore, it is not necessary to provide a sensor for detecting the vibration of the motor or its failure in order to prepare for interruption of the supply line (e.g., a plurality of). Accordingly, the approach proposed here offers the advantage of being able to detect interruptions in the feed line quickly and reliably with technically simple means.

According to one embodiment of the approach proposed here, the switching unit can be formed as a semiconductor device, in particular as a MOSFET transistor, in particular in this case the diode is a parasitic diode of a semiconductor device. This embodiment of the approach proposed herein provides the advantage of using economically feasible switching units that are technically widespread.

An embodiment of the present approach is also preferred wherein the detection unit is configured to detect interruption if the voltage difference between the voltage on the supply voltage terminal and the voltage on the supply line has a predetermined relationship to the breakdown voltage of the diode. In particular, blocking can be detected when the voltage difference between the voltage on the supply voltage terminal and the voltage on the supply line corresponds to the negative breakdown voltage of the diode. This embodiment offers the advantage of being able to perform detection of interception according to very precise criteria. In this way, erroneous detection of blocking can be substantially prevented.

In accordance with yet another embodiment of the approach proposed herein, the switching unit may comprise one or more additional switching elements connected between the supply line and the ground terminal of the detection device. In this case, the detection unit can be formed so as to detect the interruption when the further switching member is also placed in the closed state. This embodiment of the approach proposed here provides the advantage of likewise very reliably detecting interception. At the same time, it can be ensured that the potential on the supply line can be set at a predetermined value (for example, by closing additional switches or switching elements of the further switching units).

Furthermore, according to a further embodiment, the switching unit is part of a rectifier bridge circuit, in particular in this case the switching unit is part of a polyphase rectifier bridge circuit. This embodiment of the proposed approach offers the advantage that in many cases the rectifier bridge circuit is already used to supply electrical energy in the electrical load device. If an economical rectifier bridge circuit is now used in accordance with the approach proposed here as a switching unit, the manufacturing cost for the use of the sensing device proposed here is reduced and at the same time, Complex changes in the circuit are also avoided.

According to another embodiment of the approach proposed herein, the detection unit may be configured to detect the interruption only after the voltage detected on the supply line after a predetermined waiting time is greater than the voltage applied on the supply voltage terminal . For example, the waiting time may correspond to 1/4 to 1/3 of the period length of the alternating voltage applied on the supply voltage terminal. This embodiment of the approach proposed here provides the advantage that before the detection of the interruption, the attenuation or transient response of the voltage level is queued after the process of switching the voltage on the supply line. For example, for this purpose, the switching element may first be switched from the closed state to the open state, then wait for a waiting time, and then, based on the comparison of the voltage on the supply line with the voltage on the supply voltage terminal, Can be detected. This procedure provides the advantage of block detection with certain but less error detection.

In the approach proposed here, an embodiment in which the detection unit is formed to detect interruption after a waiting time which depends on the current flowing on the supply line at a preceding point in time and / or one or more operating parameters of the load device is particularly preferred Do. The operating parameters of the load device may be, for example, the number of revolutions of the motor, or a characteristic curve of a magnet or magnetizable member in the load device. This embodiment of the approach proposed here provides the advantage that the waiting time can be set in accordance with predetermined parameters that affect the voltage behavior of the supply line. In this way, the reliability of blocking detection can be improved.

In the approach proposed in the present application, an embodiment including a charge pump configured to generate a test voltage using a voltage applied on a supply terminal by a voltage supply unit can be implemented in a very simple manner from a technical point of view.

According to another embodiment of the approach proposed here, a method for detecting interruption in the supply line between the detection device and the electrical load device is proposed, wherein the detection device comprises a switching unit, A voltage supply unit, and a detection unit. The switching unit is connected between the supply voltage terminal and the supply line and the switching unit comprises a controllable switching member and a diode connected in parallel to the switching member, the cathode of the diode being connected to the supply voltage terminal and the anode of the diode It is electrically conductive with the supply line. The voltage supply unit is connected to the supply line, wherein the test voltage is higher than the voltage applied on the supply terminal, and the detection unit is arranged such that the switching member is located in the open state and the voltage detected on the supply line Lt; / RTI > is greater than the applied voltage. The method comprises the following steps:

Opening the switching member,

Detecting a voltage on the supply line and a voltage on the supply voltage terminal after opening and / or a potential on the supply line and a potential on the supply voltage terminal,

Detecting the interruption if the voltage detected on the supply line is greater than the voltage applied on the supply voltage terminal and / or if the potential on the supply line is higher than the potential on the supply voltage terminal.

The approach proposed herein also provides a control device configured to execute, control, or implement the steps of an embodiment of the method proposed herein in corresponding units. This modification of the present invention in the form of a control device can also quickly and efficiently solve the problem of the present invention.

The control device may be used herein to refer to an electrical device that processes sensor signals and accordingly emits control signals and / or data signals. The control device may include an interface that may be formed on a hardware and / or software basis. In the case of hardware-based formation, the interfaces may be part of a so-called system ASIC that includes a wide variety of functions of the control device. Or the interfaces may be self-contained integrated circuits, or at least partially discrete elements. In the case of software-based formation, the interfaces may be, for example, software modules provided with other software modules on one microcontroller.

Also, a computer program product or a computer program containing program code is also preferred, and the program code may be stored in a machine-readable medium or a storage medium, such as a semiconductor memory, a hard disk storage device, or an optical memory, Implement and / or control the steps of the method according to any one of the preceding embodiments when the program is run on a computer or any device. Accordingly, the approach proposed herein also provides a machine-readable storage medium in which a computer program is stored, as previously described.

The approach proposed here is described in more detail below as an example, in accordance with the accompanying drawings.

1 is a block diagram of a detection device to which an electric load device is connected.
2 is a plugging diagram for detecting interruption in one of the supply lines of the motor phase.
3 is a block diagram of a detection device to which an electric load device is connected, in accordance with an embodiment of the present invention introduced herein.
4 is a detailed view of a part of the detection device according to the drawing of Fig.
Fig. 5 is a switching graph for detecting interruption of a supply line when using a detection device corresponding to Figs. 3 and 4. Fig.
6 is a flow diagram of a method according to an embodiment of the present invention.

In the following description of the preferred embodiments of the present invention, the same or similar reference numerals are used for members that are shown in different drawings and which act in a similar manner, in which case repeated descriptions of the members are omitted.

1, a block diagram of a detection apparatus 100 to which an electric load apparatus 110 is connected is shown. Here, the electric load device 110 is a polyphase load device and is formed as a brushless electric motor that can receive electric energy through three supply lines 115a, 115b and 115c separated from each other, for example. Each of the supply lines 115a, 115b and 115c supplies power to one of the windings (phases) of the electric motor 110. [ The driving of the brushless motors such as the electric motor 110 is performed through the B6 bridge 120 (output stage), which is normally driven by the bridge driver 125. [ The B6 bridge 120 herein includes one power transistor 135a, one for each of the phases or for switching the supply voltage Ubat of the supply voltage terminal 140 to one of the supply lines 115a, 115b or 115c, 135b and 135c and three half-bridge 130a (145a, 145b and 145c) each including one power transistor 145a, 145b and 145c for switching phase or associated supply lines 115a, 115b and 115c to ground potential terminal 150 , 130b and 130c. In this case, the power transistors 135 to 145 are realized through semiconductor elements such as MOSFET transistors, IGBTs, or thyristors, for example. In this case, the power transistors 135 and 145 are connected in parallel to the respective switching elements S1a, S1b, S1c, S2a, S2b, and S2c for realizing an essentially (controllable) switching function, D1b, D1c, D2a, D2b, D2c between the drain terminal and the source terminal when using MOS transistors as power transistors 135 to 145, for example. The diodes D1a, D1b and D1c of the power transistors 135 connected between the supply voltage terminal 140 and the respective one supply line 115 are connected to the cathode of the associated diodes D1a, And is polarized in such a manner that it is connected to the voltage terminal 140. The diodes D2a, D2b and D2c of the power transistors 145 connected between the ground potential terminal 150 and the respective one supply line 115 are connected in parallel to each other in such a manner that the cathodes are connected to the associated supply lines 115, do.

The bridge driver 125 is driven by the main computer 155 (e.g., a microcontroller (uC)). The bridge driver connects the supply voltage Ubat of the supply voltage terminal 140 or the corresponding phases to the corresponding supply line 115a, 115b or 115c according to the current rotor position of the motor 110, A rotating magnetic field is formed in the electric motor as the device 110. [ In the case of block rectification, which is the simplest method for generating a rotating magnetic field, the three half bridges 130a, 130b to 130c have the following three states alternately in accordance with the current rotor position, respectively.

The high side transistor 135 (a, b, c) and the low side transistor 145 (a, b, c) generate a voltage between 0V and Ubat (PWM phase) on the associated supply line to which they are connected A state in which a clock signal is alternately supplied to a PWM in order to make a clock signal;

The high side transistor 135 (a, b, c) is switched off and the low side transistor 145 (a, b, c) is switched on (ground phase); And

State (tri-state-phase) in which the high-side transistors 135 (a, b, c) and the low-side transistors 145 (a, b, c) are switched off.

During start-up (control device start-up) of the main computer 155 or the bridge driver 125, output stage diagnosis or diagnosis of the B6 bridge, or diagnosis of the correct voltage level on the supply lines 115 is performed. This diagnosis should in particular detect the drop of the motor phase line 115 between the control device or the detecting device 100 and the electric motor as the electric load device 110. The drop in phase means here that a break in one of the feed lines 115 has occurred. That is, if a line break or a cut-off 160 generally occurs in one of the supply lines 115, as described through the interruption of the first supply line 115a in FIG. 1, The phase or windings of the motor will no longer receive electrical energy. In the case of this failure pattern, the electric motor 110 can be rotated unchanged, but the output can be reduced, the concentric rotation may become more uneven, and the sound intensity increases due to vibration. In the above concept, it is assumed that the B6 bridge 120 is inactivated, that is, all of the high-side transistor 135 and the low-side transistor 145 are switched off. On the other hand, the second supply line 115b has a resistance of, for example, 2R between the supply voltage terminal 140 and the first supply line 115a and between the supply voltage terminal 140 and the second supply line 115b, (Having a resistance R connected between the ground terminal 150 and the ground potential terminal 150) can be considered as being shorted by an external motor as the electric load device 110 in a normal operating state And provides a voltage level defined in motor phases 115. In this case, the phase voltage is detected and evaluated through the analog channel 170 (ADC) of the computer 155. The phase voltage should be within a predetermined range according to the supply voltage Ubat. On the other hand, if the first motor phase 115a, the motor phase 115b or the third motor phase 115c drops (that is, the interruption occurs in the corresponding supply lines 115a, 115b to 115c) The voltage at the readout third phase 115c has just changed and drops due to the valid diagnostic network 165, so that the line voltage drop can be reliably detected.

In FIG. 2, a switching graph 200 is shown for detecting interruption in one of the supply lines 115 of the motor phase. In this case, the phase voltage U _115c detected in the ADC channel 175 on the third supply line _115c is written on the ordinate of the graph of Fig. In the first region 210 where the phase voltage is at its maximum (that is, corresponding to the predetermined target value U _soll ), all the supply lines 115 in the load device 110 are correctly connected, that is, Quot; good (IO) "state in which there is no blocking, such as blocking 160 at the < / RTI > And the phase voltage U _115c having a smaller value in the region 210 is applied to the ADC channel 175 as in the case of the region 220 in FIG. It can be inferred that the cutoff 120 exists in the second connection line 115b. Furthermore, if a much lower voltage is measured in the ADC channel 175 than in the area 220, or if no further voltage is measured (as shown in area 230 of FIG. 2), the third supply line 115c, It can be deduced that the blocking exists in the network. In this regard, if a phase voltage U _115c lower than the voltage in the first region 210, i.e. lower than the set voltage, is detected on the ADC channel 175, then the connection lines 115 are "Quot; (NIO) "state.

One important aspect of the approach proposed herein is that the proposed system or sensing device 100 for the detection of the interruption of the supply line 115 towards the electrical load device can be provided to the motor 100 during the actuation of the motor 110, So that the diagnosis of the drop in phase or the interruption of the supply line 115 can be detected.

The drop in the motor phase 115 is primarily due to the fact that the control device or sensing device 100 is activated (e.g., in a transmission mounted on a motor 110, not shown in FIG. 1) It is caused by vibration. In other words, the goal of the approach proposed herein is to change the diagnostic strategy so that the descended line 115 is detected while the motor 110 is actively operating. Thus, accurate control of the electric motor 110 is ensured at all times, and erroneous rotation including an output drop at the electric motor 110 is prevented until a control error including safety critical conditions is reached.

Although the approach proposed herein is based on the B6 bridge circuit 120, it will be appreciated by those of ordinary skill in the art that the principle of detection of the interruption of the supply line 115 of the electrical load device 110 can be realized by means of an electrical load device 110 can also be applied to the detection of a single feed line 115 of a single feed line. Thus, in this specification, the approach is also disclosed in which the interruption of one supply line 115 is disclosed, so the claims are also protected by the scope of this specification.

On the other hand, in order to achieve improvement or expansion of the detection apparatus 100 according to Fig. 1, the system of Fig. 1 is slightly modified. In this case, as can be seen in the block diagram of FIG. 3, the components of the diagnostic network 165 and the ADC channel 175 may be omitted. The diagnosis of the occurrence of the interruption is made during the operation, that is to say the current flow to the motor 110 via the second supply line 115b and the current reverse flow from the motor 110 via the third supply line 115c Can be performed when it is present. In this case, the first half bridge 130a is in a three-phase state, the second half bridge 130b is in a PWM state, and the third half bridge 130c is in a "low side active" state. The first supply line 115a is supplied with the potential of the supply voltage terminal 140 via the first high side transistor 135a at a certain point in time of rotation of the motor 110. In this case, The electric power can not be supplied to the battery.

4 is a detailed view of a portion of a block diagram of a detection device 100 according to the diagram of FIG. 3 to better illustrate the working principle of the approach proposed herein.

To switch on the high side transistors 135 of the B6 bridge, it usually requires a voltage that is higher than the battery voltage (which is referred to herein as the supply voltage Ubat). For this reason, an internal charge pump CP is provided in the bridge driver 125 (CP in FIG. 4). The charge pump provides power to the internal floating gate drivers FG of the bridge drivers 125 for driving the high side transistors 135 of the respective half bridge 130a, 130b and 130c. Based on the concept proposed herein, a leakage current typically ranging from a high side source terminal 400 (typically electrically connected to the (first) supply line 115a of the bridge driver 125) to a few hundreds of uA IL) is released.

For sensing the overcurrent passing through the half bridge 130a, the bridge drive is connected to terminals 400 and 410 of external power transistors 135 (also formed here as MOSFETs) And a detection unit (DS) for analogue detection of the drain-source voltage. The detection unit DS has a measurement range of, for example, about -1.5V to 1.5V, and can very accurately detect the external voltage between the terminals 400 and 410 of the resulting (high-side) transistor 135a.

The voltage value detected through the detection unit DS between the terminals of the high side transistor (high side) 135a is transmitted to the computer 155 via SPI communication on demand.

The approach for extended motor phase diagnosis proposed herein utilizes these characteristics. In this case, the motor phase in the block rectification or matching rectification can be diagnosed, or the associated half bridge 130 (here half bridge 130a) of the supply lines 115 can be directly coupled to the supply line Block 160 can be diagnosed. In this case, in the case of block rectification, as can be seen in FIG. 3, the second half bridge 130b is located in the PWM phase and the third half bridge 130c is located in the ground phase. When the motor line 115 is properly connected, the source leakage current IL flows into the motor 110, while at the same time the voltage level at the source pin 400 lies between 0V and Ubat.

In the case of the lowered motor phase 115, the leakage current IL can not flow into the motor 110 and instead an internal high-side diode (here diode D1a) of the high-side transistor 135a ] Directs the current in the direction of the supply voltage terminal 140 having the supply voltage Ubat. As a result, a voltage drop occurs due to the diode current flow in the diode D1a, so that the voltage level at the source pin 400 rises to Ubat + Udiode for the voltage dropped line.

The diagnosis proposed herein enables analysis after every commutation transition at phase 115 located in a three-phase mode. In this case, the minimum time or waiting time should be waited for in order to prevent erroneous diagnosis due to the phase circulation current being attenuated through the high side diode (here D1a). For example, dynamic waiting time calculations are also possible depending on the phase current, the rotational speed and the motor parameters actually flowing. At the request of the computer 155 via the SPI, the drain-source voltage (U _{drain -source} ) of the high side transistor (here 135a) is read after the wait time. The following classification is applied as an example to determine whether the analyzed phase has dropped.

- Maximum measuring range ≥ U _{Drain - Source} ≥ -0.2 V → Motor phase "Good"

- -0.2V> U _{Drain -source} ≥ Minimum measuring range → Motor phase "Defective"

Fig. 5 shows a corresponding switching graph for detection of interruption of the supply line when using the detection device 100 corresponding to Figs. 3 and 4. Fig. In this case, the drain-source voltage (U _{drain -source} ) is written in the ordinate of the graph of Fig. In the first region 500, the drain-source voltage (U _{drain -source} ) lies in the range between the maximum measuring range and a value of -0.2V [which corresponds here to the value of the breakdown voltage of diode D1a). In this range, the value of the drain-source voltage (U _{drain -source} ) indicates that the observed motor phase is in a good state (IO). Conversely, if the value of the drain-source voltage (U- _{drain -source} ) is in the range between the minimum measured value and -0.2 V, the tested motor phase 115 is deduced to have dropped, (NIO). In this way, the approach proposed here allows not only to determine whether a cutoff has occurred in one of the feed lines 115, but also to determine whether the cutout of the tested feed lines 115 by technically very simple means, It can also be determined which of the supply lines is blocked.

In addition to the benefits of constantly repeated phase-drop diagnostics, hardware components are also saved through the elimination of diagnostic networks and analog feedback through the approach proposed here.

The availability of the extended motor phase diagnosis approach of the brushless DC motor proposed herein is not limited to all multiphase motor control systems that utilize a rectified form in which the half bridge is located in the three phase mode. Rather, the approach proposed herein also allows any supply line to the electrical load device 110 to be checked for the presence or absence of the barrier 160.

Finally, FIG. 6 shows a flow diagram of a method 600 for detecting interruption in a supply line between a sensing device and an electrical load device, according to one embodiment of the approach proposed herein. The method 600 uses a sensing unit that includes a switching unit, a voltage supply unit for supplying a test voltage, and a detection unit, and the switching unit is connected between the supply voltage terminal and the supply line. The switching unit also includes a controllable switching member and a diode connected in parallel to the switching member, the cathode of the diode being electrically conductive with the supply voltage terminal and the anode of the diode being electrically conductive with the supply line. The voltage supply unit is connected to the supply line, where the test voltage is higher than the voltage applied on the supply terminal. The detection unit is arranged so that when the switching member is in the open state and the voltage detected on the supply line is greater than the voltage applied on the supply voltage terminal and / or when the potential on the supply line is higher than the potential on the supply voltage terminal Blocking is detected. The method 600 of the present invention includes opening (610) a switching member. The method 600 of the present invention also includes detecting (step 620) the voltage on the supply line and the voltage applied on the supply voltage terminal, and / or the voltage on the supply line and the voltage on the supply voltage terminal after the opening . Finally, the method 600 of the present application is characterized in that if the voltage detected on the supply line is greater than the voltage applied on the supply voltage terminal, and / or if the potential on the supply line is higher than the potential on the supply voltage terminal (Step 630).

The embodiments described above and shown in the drawings are only selected by way of example. The different embodiments may be combined completely or in conjunction with individual features. In addition, one embodiment may be supplemented with features of another embodiment.

In addition, the method steps proposed herein may not only be repeated, but may also be performed in a different order than the order of description.

If an embodiment includes a concatenation of "and / or" between the first and second features, this also encompasses the first feature as well as the second feature in accordance with one embodiment, and in another embodiment And therefore should be construed to mean only a first feature or a second feature only.

Claims (12)

A detecting device (100) for detecting a blocking (160) in a supply line (115a) between a detecting device (100) and an electric load device (110), the detecting device (100)
A switching unit 135a connected between the supply voltage terminal 140 and the supply line 115a and having a controllable switching member S1a and a diode connected in parallel to the switching member S1a D1a), the cathode of which is connected to the supply voltage terminal (140) and the anode of the diode is electrically connected to the supply line (115a); a switching unit (135a);
A voltage supply unit CP capable of being connected to the supply line 115a for the supply of the test voltage wherein the test voltage is higher than the voltage applied on the supply voltage terminal 140 during operation of the detection device 100, A voltage supply unit (CP);
If the switching element Sla is in the open state and the voltage detected on the supply line 115a is greater than the voltage applied on the supply voltage terminal 140 or if the potential on the supply line 115a is greater than the supply voltage terminal & (DS) configured to detect a cut-off (160) when the supply voltage is higher than the potential on the supply line (140), or both of the two cases are established, . A detection device (100) according to claim 1, characterized in that the switching unit (135a) is formed as a semiconductor device. 3. The method according to claim 1 or 2, wherein the detecting unit (DS) is arranged such that a voltage difference (U _drain-source ) between the voltage on the supply voltage terminal (140) and the voltage on the supply line (115a) Characterized in that it is configured to detect the cut-off (160) if it has a predetermined relation to the voltage. 3. The apparatus according to any one of the preceding claims, wherein the switching unit (135a) has one or more additional switching members (S1b) connected between the ground terminal (150) of the detecting device (100) and the supply line (115a) Characterized in that the unit (DS) is formed to detect the cut-off (160) when the further switching element (S1b) is also in the closed state, characterized in that the detection device (100) . A detection device (100) according to any of the preceding claims, characterized in that the switching unit (135a) is part of a rectifier bridge circuit (120). 3. The apparatus according to claim 1 or 2, wherein the detection unit (DS) is configured such that the voltage detected on the supply line (115a) after a predetermined waiting time is greater than the voltage applied on the supply voltage terminal (140) Is configured to detect the cut-off (160). The method according to claim 6, characterized in that the detection unit (DS) is arranged to operate in accordance with the current flowing in the supply line (115a) at any preceding point in time or according to one or more operating parameters of the load device (110) Characterized in that it is configured to detect the cut-off (160) after a waiting time which is dependent on the detection of the cut-off (160). 3. A device as claimed in claim 1 or 2, wherein the voltage supply unit (CP) comprises a charge pump, which is configured to generate a test voltage using a voltage applied on the supply voltage terminal (140) ≪ / RTI > characterized in that the detection of the interruption in the supply line (100). In a method (600) for detecting a cut-off (160) in a supply line (115a) between a detection device (100) and an electrical load device (110), the detection device (100) comprises a switching unit (135a) A voltage supply unit CP for supplying a voltage and a detection unit DS which are connected between the supply voltage terminal 140 and the supply line 115a, 135a includes a controllable switching element S1a and a diode connected in parallel to the switching element S1a, the cathode of which is connected to the supply voltage terminal 140 and the anode of the diode is connected to the supply line 115a, And the voltage supply unit CP is connected to a supply line 115a at which the test voltage is higher than the voltage applied on the supply voltage terminal 140 and the detection unit DS is connected electrically, , The switching member S1a is placed in the open state, the supply line 115a, Or when the potential on the supply line 115a is higher than the potential on the supply voltage terminal 140 or when both of the above cases are satisfied The method 600 is configured to detect a block 160, which comprises the steps of:
- opening (610) the switching element (Sla);
- detecting the voltage on supply line 115a after opening and the voltage applied on supply voltage terminal 140 or the potential on supply line 115a and the potential on supply voltage terminal 140, )Wow;
If the voltage detected on supply line 115a is greater than the voltage applied on supply voltage terminal 140 or if the potential on supply line 115a is higher than the potential on supply voltage terminal 140, And detecting (630) the blocking (160) if both of the above cases are established. A control device (100, 155) configured to execute, implement, or control all steps of the method (600) according to claim 9. A computer program configured to execute all steps of the method (600) according to claim 9 and stored in a machine-readable storage medium. 12. A machine-readable storage medium having stored thereon a computer program according to claim 11.

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