ELECTRICAL CIRCUIT AND ELECTRIC MOTOR CONTROL DEVICE WITH THE ELECTRICAL CIRCUIT

Abstract

An electrical circuit (100) is described which comprises an R2R network (1, 1.1, 1.2) having a number of switching elements (12 to 17) which are designed and configured to switch between a first reference voltage (VREFH) and a second reference voltage (VREFL) according to a digital signal (OCTHRP, OCTHRL) having a number of data bits (B[0] to B[5]) corresponding to the number of switching elements (12 to 17), such that an analog R2R network output voltage (DAC_OUT.1, DAC_OUT.2) corresponding to the digital signal (OCTHRP, OCTHRL) can be output at an R2R network output terminal (2, 2.1, 2.2). The R2R network (1, 1.1, 1.2) has a first switching element (11) which is designed and configured to switch between the first reference voltage (VREFH) and the second reference voltage (VREFL), so that the respective reference voltage (VREFH, VREFL) is applied to a first resistor (11) of the R2R network (1, 1.1, 1.2).2) can be applied and a hysteresis can be added to the analog R2R network output voltage (DAC_OUT.1, DAC_OUT.2).

Description

AREA OF INVENTION

[0001] The present disclosure relates to an electrical circuit and an electric motor control device comprising the electrical circuit. BACKGROUND OF THE INVENTION

[0002] In the prior art, electrical circuits with an R2R network are known to convert a digital signal, i.e., a digital input signal, into an analog output voltage, i.e., an analog output signal. The electrical circuit thus functions as a digital-to-analog converter (DAC).

[0003] It is also known that a comparator circuit provides a positive or negative comparator output voltage as a result of a comparison between an analog input voltage and a reference voltage. Furthermore, the operation of the comparator circuit with hysteresis is known. Hysteresis can be provided, for example, by means of a constant current source, parallel transistors, MOS diodes, cross-coupled transistors, and / or a voltage divider. However, these measures are sensitive to process variations, temperature changes, and / or fluctuations in the supply voltage. Implementing hysteresis using a voltage divider in conjunction with a multi-stage DAC can lead to a large number of components and thus a large footprint.

[0004] US Patent 11,714,126 B2 describes a detection circuit for detecting the amplitude of a clock signal, comprising a multiplexer, a digital-to-analog converter, a comparator, and a counter. The multiplexer outputs either a first signal or a second signal as a selection signal. The digital-to-analog converter outputs a reference voltage corresponding to the selection signal. The comparator compares the clock signal with the reference voltage to generate a comparison signal. The counter counts a reference clock signal to generate an overflow signal and resets the overflow signal according to the comparison signal. The overflow signal indicates the amplitude of the clock signal. SUMMARY OF THE INVENTION AND ADVANTAGEOUS EXECUTIONS

[0005] The purpose of this disclosure is to provide an advanced technique. In particular, it aims to enable hysteresis to be provided in a robust and space-efficient manner.

[0006] This problem is solved by articles with the features according to the independent claims. Advantageous embodiments are the subject of the dependent claims.

[0007] An electrical circuit as disclosed comprises an R2R network having a number of switching elements configured and set up to switch between a first reference voltage and a second reference voltage according to a digital signal having a number of data bits corresponding to the number of switching elements, such that an analog R2R network output voltage corresponding to the digital signal can be output at an R2R network output terminal. The R2R network additionally has a first switching element configured and set up to switch between the first reference voltage and the second reference voltage, such that the respective reference voltage can be applied to a first resistor of the R2R network and a hysteresis can be added to that of the analog R2R network output voltage.

[0008] An R2R network is a resistor network used primarily to convert a digital signal into an analog output voltage. The R2R network consists of an array of resistors that form a voltage divider across the network's output terminal. The resistors have a resistance ratio of 2:1, determined by their arrangement within the R2R network.

[0009] The switching elements can be designed as an electrical switching element, such as a semiconductor switching element. For example, the semiconductor switching element can be designed as a transistor, in particular a MOSFET.

[0010] The first reference voltage can, for example, have a positive or negative potential. Furthermore, the second reference voltage can have a positive or negative potential at a different level than the first reference voltage. Additionally, the second reference voltage can have the opposite negative or positive potential to the first reference voltage, i.e., the same magnitude but opposite sign. Finally, the second reference voltage can be an electrical ground with respect to the first reference voltage.

[0011] By appropriately positioning the first switch, either the first or the second reference voltage can be applied to the first resistor of the R2R network. This voltage is then applied to the R2R network's output terminal via the voltage divider formed by the network. In this way, an additional first partial voltage can be added to the R2R network's output voltage as hysteresis or offset.

[0012] Furthermore, the electrical circuit according to the disclosure can include a comparator circuit which is connected at one input terminal to the R2R network output terminal and at another input terminal to a comparator voltage.

[0013] The comparator circuit can be designed and configured to compare two voltages and generate an output signal as a result of the comparison. The comparator circuit can, for example, include an operational amplifier. The comparison voltage can be a ground connection within the electrical circuit.

[0014] The use of hysteresis means that fluctuations in one input signal of the comparator circuit, i.e. the R2R network output voltage, have no or only a negligible effect on the comparator output voltage when the distance to the comparison voltage is small.

[0015] Furthermore, the comparator circuit can be designed and configured to output a first comparator output voltage with a predetermined positive voltage value at a first comparator output terminal when the R2R network output voltage is greater than the comparison voltage.

[0016] Additionally, the comparator circuit can be designed and configured to output a first comparator output voltage with a predetermined negative voltage value at the first comparator output terminal when the R2R network output voltage is less than the comparison voltage.

[0017] The specified positive voltage value and the specified negative voltage value can be equal in magnitude.

[0018] Therefore, the comparator circuit can output a digital signal as a result of comparing the input voltages. The magnitude of the comparator output voltage is independent of the voltage difference between the input signals being compared.

[0019] The first comparator output voltage, output by the first comparator output terminal, can be fed back to the first switching element. This first switching element can be designed and configured to switch to the first reference voltage when the first comparator output voltage reaches a predetermined positive value. Therefore, the first switching element can be controlled based on the first comparator output voltage, so that when the comparator output voltage reaches a positive value, hysteresis is added to the R2R network output voltage to ensure a reliable comparison of the two comparator input signals.

[0020] Furthermore, the first switching element can be designed and configured to switch to the second reference voltage when the first comparator output voltage is negative or zero. If the second reference voltage is negative, a negative hysteresis can also be added to the comparator output voltage at the first comparator output.

[0021] Furthermore, the comparator circuit can be designed and configured to output a second comparator output voltage with a predetermined negative voltage value at a second comparator output terminal when the R2R network output voltage is greater than the comparison voltage.

[0022] Therefore, the comparator circuit can output a second comparator output voltage that is opposite to the first comparator output voltage. The magnitude of the positive and negative voltage values ​​can be equal. The magnitude of the second comparator output voltage is independent of the difference between the two input signals of the comparator circuit.

[0023] An electrical circuit as disclosed comprises a first and a second R2R network, each having a number of switching elements configured and arranged to switch between a first reference voltage and a second reference voltage according to a digital signal having a number of data bits corresponding to the number of switching elements, such that an analog R2R network output voltage corresponding to the digital signal can be output at an R2R network output terminal. The number of switching elements of the first R2R network is switchable according to a first digital signal. The number of switching elements of the second R2R network is switchable according to a second digital signal.Consequently, the first R2R network converts the first digital signal into an analog R2R network output voltage, and the second R2R network converts the second digital signal into an analog R2R network output voltage.

[0024] The first and second R2R networks each have a first switching element designed and configured to switch between the first reference voltage and the second reference voltage, so that the respective reference voltage can be applied to a first resistor of the first and second R2R networks, and a hysteresis can be added to that of the analog R2R network output voltage.

[0025] The first switch allows the first or second reference voltage to be applied to the respective first resistor of the first or second R2R network. This voltage is then applied to the R2R network output terminal via the voltage divider formed by the network. In this way, an additional first partial voltage can be added to the R2R network output voltage as hysteresis or offset.

[0026] The electrical circuit can further comprise a first and a second comparator circuit. The first comparator circuit can be connected at one input terminal to the output terminal of the first R2R network and at another input terminal to a comparator voltage. The second comparator circuit can be connected at one input terminal to the output terminal of the second R2R network and at another input terminal to a comparator voltage.

[0027] The comparison voltages of the first and second comparator circuits can be the same, e.g., a ground of the electrical circuit.

[0028] The use of hysteresis means that fluctuations in one input signal of the comparator circuit, i.e. the R2R network output voltage, have no or only a negligible effect on the comparator output voltage when the distance to the comparison voltage is small.

[0029] Furthermore, the first and second comparator circuits can be designed and configured to output a first comparator output voltage with a predetermined positive voltage value at a respective first comparator output terminal when the respective input R2R network output voltage is greater than the comparison voltage.

[0030] Additionally, the comparator circuits can be designed and configured to output a first comparator output voltage with a predetermined negative voltage value at the first comparator output terminal when the R2R network output voltage is less than the comparison voltage.

[0031] The specified positive voltage value and the specified negative voltage value can be equal in magnitude.

[0032] Therefore, the comparator circuit can output a digital signal as a result of comparing the input voltages. The magnitude of the comparator output voltage is independent of the voltage difference between the input signals being compared.

[0033] The first comparator output voltage from the first comparator output terminal can be fed back to the first switching element. That is, the first comparator output voltage from the first comparator output terminal is fed back to the first switching element of the first R2R network. The first comparator output voltage from the second comparator output terminal is fed back to the first switching element of the second R2R network.

[0034] The first switching element can then be designed and configured to switch to the first reference voltage when the specified positive voltage value of the first comparator output voltage is present. Accordingly, the first switching elements can be switched based on the respective first comparator output voltage, so that when the comparator output voltage has a positive value, hysteresis is added to the R2R network output voltage to ensure a reliable comparison of the two input signals of the comparator.

[0035] Furthermore, the first switching elements can be designed and configured to switch to the second reference voltage when the first comparator output voltage is negative or zero. If the second reference voltage is negative, a negative hysteresis can also be added to the comparator output voltage at the first comparator output.

[0036] Furthermore, at least the second comparator circuit can be designed and configured to output a second comparator output voltage with a predetermined negative voltage value at a second comparator output terminal when the R2R network output voltage is greater than the comparison voltage.

[0037] Therefore, the comparator circuit can output a second comparator output voltage that is opposite to the first comparator output voltage. The magnitude of the positive and negative voltage values ​​can be equal. The magnitude of the second comparator output voltage is independent of the difference between the two input signals of the comparator circuit.

[0038] Furthermore, the electrical circuit can have an output terminal. This output terminal can be connected to the first comparator output terminal of the first comparator circuit and the second comparator output terminal of the second comparator circuit. Consequently, an output voltage available from the output terminal can be composed of the first comparator output voltage of the first comparator circuit and the second comparator output voltage of the second comparator circuit. The output voltage can therefore be an alternating voltage.

[0039] An electric motor control device as disclosed has the electrical circuit according to the aspects described above. Therefore, the electrical circuit can be used to apply a voltage to a stator winding of the electric motor. Brief description of the drawings

[0040] Advantageous embodiments of the invention are further explained below with reference to the accompanying drawings, whereby neither the drawings nor the explanations are to be interpreted as limiting the invention in any way. The drawings show: Fig. 1. An exemplary structure of a revealed R2R network; and Fig. 2 an exemplary construction of an electrical circuit according to the revelation.

[0041] The figures are merely schematic and not to scale. The same reference symbols denote identical or equivalent features in the different drawings. DESCRIPTION OF ADVANTAGEOUS DESIGN FORMS

[0042] Fig. Figure 1 shows an example of an R2R network 1 according to the disclosure for converting a digital signal into an analog R2R network output voltage. The R2R network 1 comprises an R2R network output terminal 2 for providing the R2R network output voltage, a resistor network, which in this case includes twelve resistors 21-32, and seven switching elements 11-17. It should be noted that the number of resistors and switching elements is exemplary and the number of resistors and switching elements can be adapted according to the number of data bits of a digital signal to be converted.

[0043] Resistors 21, 22, 24, 26, 28, 30, and 32 of R2R network 1 have twice the electrical resistance of resistors 23, 25, 27, 29, and 31 of R2R network 1. Due to the conductor-like arrangement of resistors 21 to 32, the analog output voltage at R2R network output terminal 2 has a first, second, third, fourth, fifth, sixth, and seventh partial voltage. The first through seventh partial voltages are added to the analog output voltage according to the position of switching elements 11-17. As shown in Fig. As shown in Figure 1, the switching elements 11-17 are configured and designed to apply either a first reference voltage VREFH or a second reference voltage VREHL to the respective resistors 21, 22, 24, 26, 27, 30, and 32, respectively. The first reference voltage VREFH can have a predetermined positive voltage value, e.g., 5 V. The provided second reference voltage VREFL can, for example, be an electrical ground relative to the first reference voltage VREFH. Alternatively, the second reference voltage VREFL can have a voltage negative relative to the first reference voltage VREFH, e.g., -5 V.

[0044] The first switching element 11 is designed and configured to apply either the provided first reference voltage VREFH or the provided second reference voltage VREFL via the first resistor 21 and resistors 23, 25, 27, 29, 31 as the first partial voltage to the R2R network output terminal 2. The first switching element 11 can be designed and configured to apply, according to a comparator output voltage COMP_OUT of a downstream comparator circuit 110.1, 110.2 (see Fig. 2) to be switched. Thus, the first partial voltage is controlled based on the comparator output voltage COMP_OUT. The first switching element 11 can be switched to the first reference voltage VREFH when a comparator output voltage COMP_OUT with a positive voltage value is present. Furthermore, the first switching element 11 can be switched to the second reference voltage VREFL when a comparator output voltage COMP_OUT is at ground or has a negative voltage value. In this way, hysteresis or an offset can be added to the R2R network output voltage.

[0045] The second switching element 12 is designed and configured to apply either the provided first reference voltage VREFH or the provided second reference voltage VREFL via the second resistor 22 and the resistors 23, 25, 27, 29, 31 as the second partial voltage to the output terminal 2.

[0046] Furthermore, the third switching element 13 is designed and configured to apply either the provided first reference voltage VREFH or the provided second reference voltage VREFL as the third partial voltage to the R2R network output terminal 2 via the fourth resistor 24 and the resistors 25, 27, 29, 31.

[0047] Furthermore, the fourth switching element 14 is designed and configured to apply either the provided first reference voltage VREFH or the provided second reference voltage VREFL as the fourth partial voltage to the output terminal 2 via the sixth resistor 26 and the resistors 27, 29, 31.

[0048] Furthermore, the fifth switching element 15 is designed and configured to apply either the provided first reference voltage VREFH or the provided second reference voltage VREFL via the eighth resistor 28 and the resistors 29, 31 as the fifth partial voltage to the output terminal 2.

[0049] Furthermore, the sixth switching element 16 is designed and configured to apply either the provided first reference voltage VREFH or the provided second reference voltage VREFL via the tenth resistor 30 and the resistor 31 as the sixth partial voltage to the R2R network output terminal 2.

[0050] Furthermore, the seventh switching element 17 is designed and configured to apply either the provided first reference voltage VREFH or the provided second reference voltage VREFL via the twelfth resistor 32 as the seventh partial voltage to the R2R network output terminal 2.

[0051] As in Fig. As shown in Figure 1, the second switching element 12 is configured and set up to be switched according to a first data bit B[0] of a data signal. Furthermore, the third switching element 13 is configured and set up to be switched according to a second data bit B[1]. Furthermore, the fourth switching element 14 is configured and set up to be switched according to a third data bit B[2]. Furthermore, the fifth switching element 15 is configured and set up to be switched according to a fourth data bit B[3]. Furthermore, the sixth switching element 16 is configured and set up to be switched according to a fifth data bit B[4]. Furthermore, the seventh switching element 17 is configured and set up to be switched according to a sixth data signal B[5].

[0052] Thus, the second partial voltage is controlled based on the first data bit B[0]. Furthermore, the third partial voltage is controlled based on the provided second data bit B[1]. Furthermore, the fourth partial voltage is controlled based on the provided third data bit B[2]. Furthermore, the fifth partial voltage is controlled based on the provided fourth data bit B[3]. Furthermore, the sixth partial voltage is controlled based on the provided fifth data bit B[4]. Furthermore, the seventh partial voltage is controlled based on the provided sixth data bit B[5].

[0053] The data signal, containing data bits B[0], B[1], B[2], B[3], B[4], B[5], can be supplied to the respective switching elements 11-17 via a multi-pole electrical connection. For example, an input for switching the respective switching element 11-17 can be electrically connected to a data line for the respective data bit B[0], B[1], B[2], B[3], B[4], B[5]. The first data bit B[0] can be configured as the least significant bit (LSB) of the data signal, and the sixth data bit B[5] as the most significant bit (MSB) of the data signal.

[0054] Fig. Figure 2 shows an exemplary setup of an electrical circuit 100 with two R2R networks 1.1, 1.2, which corresponds to the one in Fig. The R2R network shown in Figure 1 corresponds to the first and second R2R networks 1.1 and 1.2, respectively. The first reference voltage VREFH and the second reference voltage VREFL are each supplied with the first and second R2R networks 1.1 and 1.2. Furthermore, a first digital signal OCTHRP and a second digital signal OCTHRL are supplied to the first and second R2R networks 1.1 and 1.2, respectively. As already mentioned in Figure 1, the two digital signals OCTHRP and OCTHRL have the following characteristics: Fig. As described in section 1, six data bits B[0] to B[5] are used. However, this is only an example, and the number of data bits of the digital signals OCTHRP and OCTHRL, and thus the number of resistors and switching elements, can be adjusted according to the desired or required number of data bits. Furthermore, the first digital signal OCTHRP can contain digital voltage values ​​representing positive voltage values. Similarly, the second digital signal OCTHRL can, for example, contain digital voltage values ​​representing negative voltage values.

[0055] Furthermore, the electrical circuit 100 includes a first comparator circuit 110.1 with a first comparator output terminal 112.1 for outputting a first comparator output voltage COMP_OUT.1. The electrical circuit 100 also includes a second comparator circuit 110.2 with a first comparator output terminal 112.2 for outputting a first output voltage COMP_OUT.2.

[0056] The first and second comparator circuits 112.1 and 112.2, respectively, are connected at one of their input terminals to the R2R network output terminals 2.1 and 2.2 of the first and second R2R networks 1.1 and 1.2, respectively, to receive the R2R network output voltage DAC_OUT.1 and DAC_OUT.2, respectively. At another of their input terminals (not shown), the two comparator circuits 110.1 and 110.2 are connected to a reference voltage. The other two input terminals of the two comparator circuits 110.1 and 110.2 can be connected to the same reference voltage, e.g., the ground of the electrical circuit.

[0057] The respective comparator output voltage COMP_OUT.1 or COMP_OUT.2 is determined according to the result of a comparison between the respective input R2R network output voltage DAC_OUT.1 or DAC_OUT.2 with the reference voltage. The two comparator circuits 110.1 and 110.2 are configured such that they output the first comparator output voltage COMP_OUT.1 or COMP_OUT.2 at their first comparator output terminal 112.1 or 112.2 with a predefined positive voltage value if the input R2R network output voltage DAC_OUT.1 or DAC_OUT.2 is greater than the reference voltage.

[0058] Furthermore, the respective first comparator output voltage COMP_OUT.1 or COMP_OUT.2 is fed back to the respective R2R network 1.1 or 1.2. As already mentioned in relation to Fig.As described in section 1, the first switching element 11 is switched according to the first comparator output voltage COMP_OUT.1 or COMP_OUT.2. If the comparator output voltage COMP_OUT.1 or COMP_OUT.2 has a positive value, the switching element is switched to the first reference voltage VREFH, so that the first partial voltage is added as hysteresis or offset to the R2R network output voltage DAC_OUT.1 or DAC_OUT.2.

[0059] Furthermore, at least the second comparator circuit 110.2 can have a second comparator output terminal 112.3 for outputting a second comparator output voltage COMP_OUT.3. The second comparator circuit 110.2 is configured and designed to output the second comparator output voltage at the second comparator output terminal 112.3 with a predefined negative voltage value when the input R2R network output voltage DAC_OUT.2 is greater than the reference voltage. The positive voltage value of the first comparator output voltage COMP_OUT.2 and the negative voltage value of the second comparator output voltage COMP_OUT.3 can be equal in magnitude.

[0060] Furthermore, the electrical circuit 100 has an output terminal 101 for outputting an output voltage. This output terminal is connected to the first comparator output terminal 112.1 of the first comparator circuit 110.1 and the second comparator output terminal 112.2 of the second comparator circuit 110.2. Therefore, the output voltage output by the output terminal 101 is composed of the first comparator output voltage COMP_OUT.1 of the first comparator circuit 110.1 and the second comparator output voltage COMP_OUT.3 of the second comparator circuit 110.2.

[0061] In the event that the first digital signal OCTHRP represents positive voltage values ​​and the second digital signal OCTHRL represents negative voltage values, an alternating current signal can be output by the electrical circuit 100.

[0062] The described electrical circuit 100 can, according to one embodiment, be used in an electric motor control device. The output voltage provided by the output terminal 100 can be applied to a stator coil of the electric motor.

[0063] Finally, it should be noted that terms such as "comprising," "encompassing," etc., do not exclude other elements or steps, and terms such as "a" or "an" do not exclude a plurality. Furthermore, it should be noted that features or steps described with reference to one of the above embodiments may also be used in combination with other features or steps of other embodiments described above. Reference numerals in the claims are not to be considered as a limitation. REFERENCE MARK LIST 1, 1.1, 1.2 R2R network 2, 2.1, 2.2 R2R network output port 21-32 resistors 11-17 Switching elements 100 electrical circuits 101 Output port 110.1, 110.2 Comparator circuit 112.1, 112.2 first comparator output terminal 112.3 Second comparator output terminal DAC_OUT.1 R2R network output voltage DAC_OUT.2 R2R network output voltage VREFH first reference voltage VREFL second reference voltage COMP_OUT.1 first comparator output voltage COMP_OUT.2 first comparator output voltage COMP_OUT.3 second comparator output voltage OCTHRP first digital signal OCTHRL second digital signal B[0] first data bit B[1] second data bit B[2] third data bit B[3] fourth data bit B[4] fifth data bit B[5] sixth data bit

Claims

[1] Electrical circuit (100), comprising: an R2R network (1, 1.1, 1.2) comprising a number of switching elements (12 to 17) configured and set up to switch between a first reference voltage (VREFH) and a second reference voltage (VREFL) according to a digital signal (OCTHRP, OCTHRL) having a number of data bits (B[0] to B[5]) corresponding to the number of switching elements (12 to 17), such that an analog R2R network output voltage (DAC_OUT.1, DAC_OUT.2) corresponding to the digital signal (OCTHRP, OCTHRL) can be output at an R2R network output terminal (2, 2.1, 2.2); characterized by , that the R2R network (1, 1.1, 1.2) has a first switching element (11) which is designed and configured to switch between the first reference voltage (VREFH) and the second reference voltage (VREFL), so that the respective reference voltage (VREFH, VREFL) can be applied to a first resistor (21) of the R2R network (1, 1.1, 1.2) and a hysteresis can be added to the analog R2R network output voltage (DAC_QOUT.1, DAC_OUT.2). [2] Electrical circuit (100) according to claim 1, further comprising: a comparator circuit (110.1, 110.2) which is connected at one input terminal to the R2R network output terminal (2, 2.1, 2.2) and at another input terminal to a comparator voltage. [3] Electrical circuit (100) according to claim 2, wherein the comparator circuit (110.1, 110.2) is designed and configured to output a first comparator output voltage with a predetermined positive voltage value at a first comparator output terminal (112.1, 112.2) when the R2R network output voltage (DAC_OUT.1, DAC_OUT.2) is greater than the comparison voltage. [4] Electrical circuit (100) according to claim 3, wherein the first comparator output voltage (COMP_OUT.1, COMP_OUT.2) output by the first comparator output terminal (112.1, 112.2) is fed back to the first switching element (11), and the first switching element (11) is designed and configured to switch to the first reference voltage (VREFH) when the specified positive voltage value of the first comparator output voltage (COMP_OUT.1, COMP_OUT.2) is present. [5] Electrical circuit (100), comprising: A first and a second R2R network (1.1, 1.2), each comprising a number of switching elements (12 to 17) configured and set up to switch between a first reference voltage (VREFH) and a second reference voltage (VREFL) according to a digital signal (OCTHRP, OCTHRL) having a number of data bits (B[0] to B[5]) corresponding to the number of switching elements (12 to 17), such that an analog R2R network output voltage (DAC_OUT.1, DAC_OUT.2) corresponding to the digital signal (OCTHRP, OCTHRL) can be output at an R2R network output terminal (2.1, 2.2), wherein the number of switching elements (12 to 17) of the first R2R network (1.1) is switchable according to a first digital signal (OCTHRP), and the number of switching elements (12 to 17) of the second R2R network (1.2) is switchable according to a second digital signal (OCTHRL); characterized by , that the first and second R2R network (1.1, 1.2) each have a first switching element (11) which is designed and configured to switch between the first reference voltage (VREFH) and the second reference voltage (VREFL), so that the respective reference voltage (VREFH, VREFL) can be applied to a first resistor (21) of the first and second R2R network (1.1, 1.2) and a hysteresis can be added to that of the analog R2R network output voltage (DAC_OUT.1, DAC_OUT.2). [6] Electrical circuit (100) according to claim 5, further comprising: a first and a second comparator circuit (110.1, 110.2), wherein the first comparator circuit (110.1) is connected at one input terminal to the R2R network output terminal (2.1) of the first R2R network (1.1) and at another input terminal to a comparator voltage, and the second comparator circuit (110.2) is connected at one input terminal to the R2R network output terminal (2.2) of the second R2R network (1.2) and at another input terminal to a comparator voltage. [7] Electrical circuit (100) according to claim 6, wherein the first and the second comparator circuit (110.1, 110.2) are designed and configured to output a first comparator output voltage with a predetermined positive voltage value at a respective first comparator output terminal (112.1, 112.2) when the respective input R2R network output voltage (DAC_OUT.1, DAC_OUT.2) is greater than the comparison voltage. [8] Electrical circuit (100) according to claim 7, wherein the first comparator output voltage (COMP_OUT.1, COMP_OUT.2) output by the first comparator output terminal (112.1, 112.2) is fed back to the first switching element (11), and the first switching element (11) is designed and configured to switch to the first reference voltage (VREFH) when the specified positive voltage value of the first comparator output voltage (COMP_OUT.1, COMP_OUT.2) is present. [9] Electrical circuit (100) according to one of claims 6 to 8, wherein at least the second comparator circuit (110.1, 110.2) is designed and configured to output a second comparator output voltage (COMP_OUT.3) with a predetermined negative voltage value at a second comparator output terminal (112.2) when the R2R network output voltage (DAC_OUT.2) is greater than the comparison voltage. [10] Electrical circuit (100) according to claims 8 and 9, comprising an output terminal (101) which is connected to the first comparator output terminal (112.1) of the first comparator circuit (110.1) and the second comparator output terminal (112.3) of the second comparator circuit (110.2). [11] Electric motor control device comprising the electrical circuit (100) according to any one of claims 1 to 10.

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