Circuit for controlling an electric switching element and switching device with the circuit

Abstract

A circuit (3) for controlling an electrical switching element (21), configured to apply a voltage supplied by an off-ground voltage source to a load, and a circuit device (1) incorporating the circuit are described. A control voltage supplied by a driver is applied to a control terminal (21.2) of the electrical switching element (21) via a driver circuit. A stabilization circuit (10) is provided to compensate for overshoot and / or undershoot in a voltage at a reference terminal (21.1) of the electrical switching element during pulsed control of the electrical switching element. The stabilization circuit (10) supplies a current to the control terminal (21.2) that opposes a current flowing through a parasitic capacitance (23) between the control terminal (21.2) and the load terminal (21.3) in order to dampen or compensate for the overshoot and / or undershoot.

Description

AREA OF INVENTION The present invention relates to a circuit for controlling an electrical switching element configured to apply a voltage supplied by a floating voltage source to a load. The present invention further relates to a circuit device comprising the circuit according to the invention. TECHNICAL BACKGROUND In a circuit with a floating voltage supply and a high-side switching transistor, especially when using p-channel field-effect transistors (p-MOSFETs), undesired potential shifts can occur at the source terminal during switching. These transient effects, sometimes referred to as the Miller effect, result from the parasitic gate-drain capacitance of the transistor, which causes capacitive coupling during rapid switching. In floating configurations without a fixed ground reference, this can lead to momentary overshoot or undershoot of the source potential, potentially resulting in faulty or unstable drive of the transistor. To reduce these undesirable effects, a capacitor is conventionally connected between the gate and source of the high-side transistor. This stabilizes the gate-source potential and effectively dampens the voltage change induced by gate-drain coupling. The gate-source capacitor acts as a low-pass filter, limiting rapid voltage changes and thus reducing the transistor's susceptibility to interference during switching operations. However, effectively suppressing the Miller effect usually requires an additional, external gate-source capacitor, whose capacitance is typically many times that of the parasitic gate-drain capacitance. This can lead to increased space requirements, higher component costs, and / or a reduction in switching speed, especially with higher-power transistors. CN 1 14 553 204 A describes a driver circuit and a driver method for a high-side N-type power MOS using current mirrors. SUMMARY OF THE INVENTION AND FORM OF EXECUTION The invention takes this conflict of objectives into account and provides a solution that combines the advantages of potential stabilization with the lowest possible additional component effort. Therefore, there may be a need for a circuit and a circuit device that reduce overshoot and / or undershoot of a voltage at a reference terminal of an electrical switching element when using an off-ground voltage source, and which can be implemented in a space-saving, cost-effective and / or fast-switching manner. The aforementioned need can be at least partially satisfied by the items according to the independent claims of the present invention. Advantageous embodiments are specified in the dependent claims, the following description, and the figures. According to a first aspect of the present invention, a circuit for controlling an electrical switching element, configured to apply a voltage supplied by a floating voltage source to a load, is described. The circuit comprises: a driver circuit configured to be coupled to a driver and a control terminal of the electrical switching element in order to apply a control voltage supplied by the driver to the control terminal for controlling the electrical switching element. The circuit further comprises: a stabilization circuit having a first terminal and a second terminal configured to be coupled to a capacitor circuit. The stabilization circuit includes a first current mirror circuit configured to be coupled to a reference terminal of the electrical switching element.The first terminal can be connected to the control terminal via the first current mirror circuit. Alternatively or additionally, the stabilization circuit includes a second current mirror circuit configured to be connected to the reference terminal and an inverter circuit configured to reverse the direction of an output current from the second current mirror circuit. The second terminal can be connected to the control terminal of the electrical switching element via the second current mirror circuit and the inverter circuit. According to a second aspect of the present invention, a circuit device is described comprising: the circuit according to the first aspect, an electrical switching element configured to apply a voltage supplied by an off-ground voltage source to a load, and a capacitor circuit coupled to the first and second terminals. The driver circuit is coupled to a control terminal of the electrical switching element. The first current mirror circuit is coupled to a reference terminal of the electrical switching element. By way of introduction, a basic idea relating to embodiments of the invention described herein will be briefly explained, whereby this explanation is to be understood as merely a rough summary and not as limiting the invention: Due to capacitive coupling, which is caused by a parasitic capacitance during rapid switching of the electrical switching element, an undesired potential shift can occur at a reference terminal of the electrical switching element. The present invention describes a circuit with a stabilization circuit and a circuit device with the circuit.By including the first current mirror circuit in the stabilization circuit and connecting the stabilization circuit to the capacitor circuit, a current can be supplied to the control terminal of the electrical switching element when a rising edge of a switching pulse occurs in the control voltage, so that an overshoot in the voltage at the reference terminal can be at least partially compensated. By additionally or alternatively including the second current mirror circuit and the inverter circuit in the stabilization circuit and connecting the stabilization circuit to the capacitor circuit, a current can be supplied to the control terminal of the electrical switching element when a falling edge of a switching pulse occurs in the control voltage, so that an undershoot in the voltage at the reference terminal can be at least partially compensated. Possible configurations and advantages of embodiments of the circuit are described in more detail below: A circuit for controlling an electrical switching element, configured to apply a voltage supplied by a floating voltage source to a load, is described. The electrical switching element can be, for example, a bipolar transistor, a MOSFET, or an IGBT, and can be configured to control a voltage from the floating voltage source to a load by closing or opening a conducting channel. The electrical switching element can, in particular, be a p-MOSFET. The electrical switching element, especially the p-MOSFET, can function as a so-called high-side switch. Several electrical switching elements, connected, for example, to form a half-bridge or full-bridge, can also be present. The electrical switching element has a reference terminal, a control terminal, and a load terminal. The reference terminal can, in particular, be a source terminal of a MOSFET. The control terminal can, in particular, be a gate terminal of a MOSFET. The load terminal can, in particular, be a drain terminal of a MOSFET. The circuit described here includes a driver circuit designed to be coupled to a driver and a control terminal of the electrical switching element in order to apply a control voltage provided by the driver to the control terminal for controlling the electrical switching element. The driver circuit is thus connected to the driver and the control terminal. The driver circuit can apply the control voltage with respect to a reference terminal of the electrical switching element. That is, the driver circuit is connected between the reference terminal and the control terminal and provides the control voltage supplied by the driver there. A gate driver IC or a discrete transistor circuit, for example, can be used to provide the control voltage. The driver can, in particular, provide the control voltage in a clocked manner. The described circuit further includes a stabilization circuit with a first and a second terminal designed to be coupled to a capacitor circuit. That is, one terminal of the capacitor circuit can be connected to the first terminal, and another terminal of the capacitor circuit can be connected to the second terminal. According to one embodiment, the stabilization circuit has a first current mirror circuit configured to be coupled to a reference terminal of the electrical switching element. According to one embodiment, the stabilization circuit alternatively or additionally comprises a second current mirror circuit configured to be coupled to the reference terminal and an inverter circuit configured to reverse the direction of an output current of the second current mirror circuit. The current mirror circuits can, for example, consist of two transistors connected in such a way that an electric current received at a reference input is also set in an output path. The inverter circuit can, for example, include a CMOS inverter or a transistor-based inverter stage and be configured to invert one direction of an input current. According to one embodiment, the first terminal can be coupled to the control terminal via the first current mirror circuit. Accordingly, the circuit forms a line from the first terminal to the control terminal, and the first current mirror circuit is arranged in this line, receiving a current from the reference terminal at its reference input. In this way, when a rising edge occurs in the control voltage, a current is supplied to the control circuit that counteracts the current flowing through the parasitic capacitance, thus preventing or at least dampening an unwanted overshoot in the voltage at the reference terminal. According to one embodiment, the second terminal can be coupled to the control terminal via the second current mirror circuit and the inverter circuit. Accordingly, the circuit forms a line from the second terminal to the control terminal, and within this line are arranged the second current mirror circuit, which receives a current flowing from the reference terminal in its reference path, and the inverter circuit, which inverts the direction of the current output by the second current mirror circuit. In this way, when a falling edge occurs in the control voltage, a current is supplied to the control circuit that counteracts the current flowing through the parasitic capacitance, thus preventing or at least damping an unwanted undershoot in the voltage at the reference terminal. In the event that the circuit includes the first current mirror circuit, the second current mirror circuit, and the inverter circuit, the line from the first terminal to the control terminal and the line from the second terminal to the control terminal can be configured, at least section by section, as a common line in order to reduce the number of line paths in the circuit. A circuit according to the invention thus eliminates the need for a capacitor that would otherwise have to be connected between the reference terminal and the control terminal and which would have to have a capacitance many times greater than the parasitic capacitance to effectively dampen overshoot and undershoot. Consequently, the space requirement is reduced and the switching speed is not affected. According to one embodiment, the inverter circuit can be a third current mirror circuit configured to be coupled to a load terminal of the electrical switching element. If the electrical switching element functions as a high-side switch, the third current mirror circuit can be coupled to the load terminal via the load. The third current mirror circuit thus receives a current from the load terminal at its reference input. In this way, the same setup as for the other two current mirror circuits can be applied to the third inverter circuit, thus simplifying the structure of the described circuit. According to another embodiment, the circuit can be designed as an integrated circuit. The integrated circuit can provide connections to the driver, the electrical switching element, and the capacitor circuit. Consequently, the circuit can be easily integrated into the circuit device described below. A described circuit device comprises the circuit described above, the electrical switching element configured to apply a voltage supplied by an off-ground voltage source to a load, and the capacitance circuit coupled to the first and second terminals. The driver circuit is coupled to a control terminal of the electrical switching element. The first current mirror circuit is coupled to a reference terminal of the electrical switching element. Therefore, the circuit device can compensate for or at least dampen an overshoot and / or undershoot of a voltage at the reference terminal of the electrical switching element. According to one embodiment, the circuit device can include a driver that is coupled to the driver circuit and configured to provide a control voltage for controlling the electrical switching element. The driver can provide the control voltage in a pulsed manner. Consequently, the circuit device enables control of the electrical switching element. According to one embodiment, the circuit device can include a floating voltage source. The floating voltage source can be understood as a voltage source without electrical grounding and is therefore not set to an externally predetermined potential. The floating voltage source can be, for example, a battery or a rechargeable battery. The floating voltage source can be connected to the electrical switching element and the load in such a way that the voltage provided by the floating voltage source can be supplied to the load by switching the electrical switching element. For example, when using a high-side switch, the reference terminal can be connected to a positive terminal of the floating voltage source. The load terminal can then be connected to one terminal of the load, and the other terminal of the load can be connected to the negative terminal of the floating voltage source.Furthermore, the driver can receive the voltage provided by the ground-free voltage source in order to generate the control voltage from it. Consequently, the load is supplied with energy from the ground-free voltage source and the control voltage is generated by the driver. According to one embodiment, the capacitance circuit has an electrical capacitance that essentially corresponds to a parasitic capacitance of the electrical switching element. The capacitance circuit can therefore include a capacitor whose capacitance is essentially fixed to the parasitic capacitance. By providing a capacitance of nearly the same nominal size as the parasitic capacitance, the current supplied to the control terminal and the current flowing through the parasitic capacitance have essentially the same current intensity, so that overshoot and / or undershoot in the voltage at the reference terminal can be compensated as effectively as possible. According to one embodiment, the capacitance circuit can include a further electrical switching element with a parasitic capacitance. A reference terminal and a control terminal of this further electrical switching element can be short-circuited. Therefore, the capacitance of the capacitor circuit is provided by the additional electrical switching element, so that no dedicated capacitor is required. According to one embodiment, the electrical switching element and the other electrical switching element can be of the same type. Preferably, the electrical switching element and the other electrical switching element are from the same manufacturer and have the same part number. More preferably, the electrical switching element and the other electrical switching element are from the same batch. Consequently, the capacitance of the capacitance circuit is optimally matched to the parasitic capacitance. This also results in optimal compensation or damping of overshoot and / or undershoot in the voltage at the reference terminal. It should be noted that possible advantages and embodiments of the invention are described herein partly with reference to a circuit according to the invention or partly with reference to a circuit device according to the invention. A person skilled in the art will recognize that the described features can be appropriately transferred, adapted, exchanged, or modified to arrive at further embodiments of the invention. BRIEF DESCRIPTION OF THE DRAWINGS The following describes embodiments of the prior art and of the invention with reference to the accompanying drawings, whereby neither the drawings nor the description are to be interpreted as limiting the invention. Fig. 1 shows a circuit device known from the prior art for controlling an electrical switching element. Fig. 2 shows a first diagram illustrating the time profiles of a switching pulse and a voltage at a reference terminal of the electrical switching element during pulsed operation of the circuit device from Fig. 1. Fig. 3 shows a circuit device according to the invention for controlling an electrical switching element. Fig. 4 shows a second diagram illustrating the time profiles of a switching pulse and a voltage at a reference terminal of the electrical switching element during pulsed operation of the circuit device from Fig. 3. The figures are purely schematic and not to scale. In particular, it should be noted that the dimensions shown in the figures are not realistic but are intended to illustrate basic principles. Identical reference symbols in the different figures denote identical or equivalent features or elements. DESCRIPTION OF PREFERRED EXECUTION FORMS Fig. 1 shows a circuit device known from the prior art with a circuit for controlling an electrical switching element 21. The circuit includes a driver circuit 2 configured to be coupled to a driver and a control terminal 21.2 of the electrical switching element 21. The driver circuit 2 is configured to receive a control voltage from the driver and apply this control voltage to the control terminal 21.2 of the electrical switching element 21 in order to control or switch the electrical switching element 21. For this purpose, the driver circuit 2 can be connected between a reference terminal 21.1 and the control terminal 21.2. The circuit device now includes the circuit described above, the driver, the electrical switching element 21 and the ground-free voltage source. In Fig. 1, the driver is simplified as a voltage source with internal resistance. The driver provides the control voltage according to a control signal to switch the electrical switching element 21 to conducting or non-conducting. In particular, the switching element 21 is controlled in a clocked manner. The electrical switching element 21 is configured to supply a voltage from an off-ground voltage source to a load, corresponding to the applied control voltage. The load can be a stator coil of an electric motor. In the variant shown in Fig. 1, the electrical switching element 21 is configured as a p-MOSFET, such that the reference terminal 21.1 corresponds to a source terminal, the control terminal 21.2 to a gate terminal, and the load terminal 21.3 to a drain terminal. The load can be connected to the load terminal 21.3, so that the electrical switching element 21 functions as a so-called high-side switch. In this case, the off-ground voltage source can be connected at its positive terminal to the load terminal 21.3 and at its negative terminal to the other terminal of the load. As shown in Fig. 1, the electrical switching element 21 has a parasitic capacitance 23 between the control terminal 21.2 and the load terminal 21.3, i.e., between the gate and drain, which can also be referred to as the parasitic gate-drain capacitance. As described below with reference to Fig. 2, this capacitance can affect a voltage applied to the reference terminal 21.1 during clocked control of the electrical switching element 21. Fig. 2 shows a first diagram 41, which in the upper area 42 represents a time course of a switching pulse 43 in the control voltage during a clocked control of the electrical switching element 21 and in the lower area 44 represents a time course of a voltage 45 at the reference terminal 21.1 of the electrical switching element 21 during clocked operation of the circuit device from the prior art. In the first diagram 41, it can be seen that at a first time point 46, during a rising edge of the switching pulse 43 in the control voltage, i.e., at a time point when the electrical switching element 21 is switched to a conducting state, an overshoot of the voltage 45 occurs at the reference terminal 21.1 of the electrical switching element 21. At a second time point 47, during a falling edge of the switching pulse 43 in the control voltage, i.e., at a time point when the electrical switching element 21 is switched to a non-conducting state, an undershoot of the voltage 45 occurs at the reference terminal 21.1 of the electrical switching element 21. It can be seen that the undershoot is significantly more pronounced than the overshoot. Fig. 3 now shows a circuit device 1 according to the invention with a circuit 3 according to the invention for controlling an electrical switching element 21. The circuit 3 according to the invention comprises a driver circuit 2 configured to be coupled to a driver and a control terminal 21.2 of the electrical switching element 21. The driver circuit 2 is configured to receive a control voltage from the driver and to apply the control voltage to the control terminal 21.2 of the electrical switching element 21 in order to control or switch the electrical switching element 21. For this purpose, the driver circuit 2 can be connected between a reference terminal 21.1 and the control terminal 21.2. In this respect, the structure of the circuit 3 according to the invention is identical to the structure of the circuit from the prior art. Furthermore, the circuit 3 has a stabilization circuit 10 which has a first terminal 10.1 and a second terminal 10.2 which are designed to be coupled to a capacitor circuit 22. Furthermore, the stabilization circuit 10 comprises a first current mirror circuit 11, a second current mirror circuit 12, and a third current mirror circuit 13. The first current mirror circuit 11 is configured to be electrically coupled to a reference terminal 21.1 of the electrical switching element 21, i.e., to be at the same electrical potential as it. The second current mirror circuit 12 is configured to be electrically coupled to the reference terminal 21.1. The third current mirror circuit 13 is configured to be electrically coupled to the load terminal 21.3. A load to be controlled can be connected between the load terminal 21.3 and the third current mirror circuit 13. Through this type of connection, the third current mirror circuit 13 functions as an inverter circuit 14, configured to invert the direction of an output current provided by the second current mirror circuit 12.to reverse. The first terminal 10.1 can be connected to the control terminal 21.2 via the first current mirror circuit 11. Furthermore, the second terminal 10.2 can be connected to the control terminal 21.2 via the second current mirror circuit 12 and the third current mirror circuit 13. The first terminal 10.1 and the second terminal 10.2 can be connected to the control terminal 21.2, at least partially, by a common line, as shown in Fig. 3. Preferably, the circuit 3 is designed as an integrated circuit. The circuit 3 designed as an integrated circuit can then be easily integrated into the circuit device 1 according to the invention as described below. The circuit device 1 according to the invention now comprises the circuit 3 with the driver circuit 2 and the stabilization circuit 10, the electrical switching element 21, the capacitor circuit 22 and the ground-free voltage source. In Fig. 3, the driver is again simplified as a voltage source with internal resistance. The driver provides the control voltage according to a control signal to switch the electrical switching element 21 to conducting or non-conducting. In particular, the switching element 21 is controlled by a clock signal. The electrical switching element 21 is configured to supply a voltage from an off-ground voltage source to a load, corresponding to the applied control voltage. The load can be a stator coil of an electric motor. In the variant shown in Fig. 1, the electrical switching element 21 is configured as a p-MOSFET, such that the reference terminal 21.1 corresponds to a source terminal, the control terminal 21.2 to a gate terminal, and the load terminal 21.3 to a drain terminal. The load can be connected to the load terminal 21.3, so that the electrical switching element 21 functions as a so-called high-side switch. In this case, the off-ground voltage source can be connected at its positive terminal to the load terminal and at its negative terminal to the other terminal of the load. Once again, the electrical switching element 21 exhibits a parasitic capacitance 23 between the control terminal 21.2 and the load terminal 21.3, i.e., between gate and drain. The capacitance circuit 22 has an electrical capacitance 24 that essentially corresponds to the parasitic capacitance 23 of the electrical switching element 21. According to one embodiment, the capacitance circuit 22, as shown in Fig. 3, can be formed by a further electrical switching element 25, such as a MOSFET, which has a parasitic capacitance 24 and whose reference and control terminals are short-circuited. Preferably, the electrical switching element 21 and the further electrical switching element 25 are of the same type. More preferably, the electrical switching element 21 and the further electrical switching element 25 are from the same manufacturer and even from the same batch. Consequently, the parasitic capacitances 23, 24 of the electrical switching element 21 and the further electrical switching element 25 are matched as closely as possible. The first current mirror circuit 11 in the line from the first terminal 10.1 to the control terminal 21.2 provides a current when a rising edge of the switching pulse occurs in the control voltage, which compensates for a current flowing across the parasitic capacitance of the electrical switching element 21. Consequently, the voltage overshoot at the reference terminal 21.1 of the electrical switching element 21 is counteracted. The second current mirror circuit 12 and the third current mirror circuit 13 in the line from the second terminal 10.2 to the control terminal 21.2 provide a current when a falling edge of the switching pulse occurs in the control voltage, which compensates for a current flowing through the parasitic capacitance 23 of the electrical switching element 21. Consequently, the undershoot of the voltage at the reference terminal 21.2 of the electrical switching element 21 is counteracted. Fig. 4 shows a second diagram 51, which in the upper area 52 shows a time course of a switching pulse 53 in the control voltage during a clocked control of the electrical switching element 21 and in the lower area 54 shows a time course of a voltage 55 at the reference terminal 21.1 of the electrical switching element 21 during clocked operation of the circuit device 1 according to the invention. In the second diagram 42, it can be seen that an overshoot of the voltage at the reference terminal 21.1 at a first time point 56 of a rising edge of the switching pulse 53 in the control voltage, i.e., at a time point at which the electrical switching element 21 is switched to a conducting state, is almost completely compensated by the provision of a counteracting current by the stabilizing circuit 10. Similarly, an undershoot of the voltage at the reference terminal 21.1 at a second time point 57 of a falling edge of the switching pulse 53, i.e., at a time point at which the electrical switching element 21 is switched to a non-conducting state, is almost completely compensated by the provision of a counteracting current by the stabilizing circuit 10. It can therefore be stated that by the circuit 3 and the circuit device 1 according to the present invention both an overshoot and an undershoot of the voltage at the reference terminal 21.1 of the electrical switching element 21 can be compensated when the electrical switching element 21 is controlled in a clocked manner. However, the circuit and the circuit device 1 are not limited to the embodiment described above, and it is also conceivable that in a simplified version of the circuit 3 only the first current mirror circuit 11 is provided in the stabilization circuit 10, i.e., no second current mirror circuit 12 and no third current mirror circuit 13 are provided. Thus, overshoot in the voltage at the reference terminal 21.1 can be counteracted. Alternatively, it is also conceivable that only the second current mirror circuit 12 and the third current mirror circuit 13, i.e., the inverter circuit 14, are provided in the stabilization circuit 10, i.e., no first current mirror circuit 11 is provided. Consequently, undershoot in the voltage at the reference terminal 21.1 can be compensated. Furthermore, the present invention has been described using an electrical switching element 21. The present invention is, of course, applicable to other devices for the pulsed control of a load, such as a half-bridge or a full-bridge. The capacitor circuit 22 must then be designed accordingly. In summary, a circuit 3 for controlling an electrical switching element 21, configured to apply a voltage supplied by a floating voltage source to a load, and a circuit device 1 incorporating the circuit are described. A control voltage supplied by a driver is applied to a control terminal 21.2 of the electrical switching element 21 via a driver circuit. A stabilization circuit 10 is provided to compensate for overshoot and / or undershoot in the voltage at a reference terminal 21.1 of the electrical switching element during pulsed control of the electrical switching element. The stabilization circuit 10 supplies a current to the control terminal 21.2 that opposes a current flowing through a parasitic capacitance 23 between the control terminal 21.2 and the load terminal 21.3 in order to dampen or compensate for the overshoot and / or undershoot. 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 Circuit device 2 Driver circuit 3 Circuit 10 Stabilization circuit 10.1 First terminal 10.2 Second terminal 11 First current mirror circuit 12 Second current mirror circuit 13 Third current mirror circuit 14 Inverter circuit 21 Electrical switching element 21.1 Reference terminal (SOURCE) 21.2 Control terminal (GATE) 21.3 Load terminal (DRAIN) 22 Capacitance circuit 23 Parasitic capacitance 24 Capacitance 25 Further electrical switching element 41 First diagram 42 Upper range 43 Switching pulse 44 Lower range 45 Voltage waveform 46 First time point 47 Second time point 51 Second diagram 52 Upper range 53 Switching pulse 54 Lower range 55 Voltage waveform 56 First time point 57 Second time point

Claims

Circuit (3) for controlling an electrical switching element (21) configured to apply a voltage supplied by an off-ground voltage source to a load, wherein the circuit comprises: a driver circuit (2) configured to be coupled to a driver and a control terminal (21.2) of the electrical switching element (21) in order to apply a control voltage supplied by the driver to the control terminal (21.2) for controlling the electrical switching element (21), characterized in that the circuit (3) further comprises: a stabilization circuit (10) having a first terminal (10.1) and a second terminal (10.2) configured to be coupled to a capacitor circuit (22), wherein the stabilization circuit (10) comprises a first current mirror circuit (11) configured to be coupled to a reference terminal (21.1) of the electrical switching element (21), and the first terminal (10.1) is capable of being coupled to the control terminal (21.2) via the first current mirror circuit (11), and / or wherein the stabilizing circuit (10) comprises a second current mirror circuit (12) configured to be coupled to the reference terminal (21.1), and an inverter circuit (14) configured to reverse the direction of an output current of the second current mirror circuit (12), wherein the second terminal (10.2) is capable of being coupled to the control terminal (21.2) of the electrical switching element (21) via the second current mirror circuit (12) and the inverter circuit (14). Circuit according to claim 1, wherein the inverter circuit (14) is a third current mirror circuit (13) configured to be coupled to a load terminal (21.3) of the electrical switching element (21). Circuit according to one of claims 1 or 2, wherein the circuit is designed as an integrated circuit (IC). Circuit device (1) comprising: the circuit (3) according to one of claims 1 to 3, an electrical switching element (21) configured to apply a voltage supplied by an earthless voltage source to a load, and a capacitor circuit (22) coupled to the first terminal (10.1) and the second terminal (10.2), wherein the driver circuit (2) is coupled to a control terminal (21.2) of the electrical switching element (21), and wherein the first current mirror circuit (11) is coupled to a reference terminal (21.1) of the electrical switching element (2). Circuit device (1) according to claim 4, comprising: a driver coupled to the driver circuit (2) and configured to provide a control voltage for controlling the electrical switching element (21). Circuit device (1) according to one of claims 4 or 5, wherein the capacitance circuit (22) has an electrical capacitance (24) which essentially corresponds to a parasitic capacitance (23) of the electrical switching element (21). Circuit device (20) according to claim 6, wherein the capacitance circuit (22) has a further electrical switching element (25) with a parasitic capacitance, wherein a reference terminal and a control terminal of the further electrical switching element (25) are short-circuited. Circuit device (20) according to claim 7, wherein the electrical switching element (21) and the further electrical switching element (25) are of the same type.

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