Control arrangement for the operation of a motor vehicle locking system

Abstract

The invention relates to a control arrangement for the operation of a motor vehicle locking system (2), wherein the control arrangement (1) comprises an H-bridge circuit (3) with two half-bridges, wherein the control arrangement (1) controls an electric drive motor (4) of the motor vehicle locking system (2) via the two half-bridges in a control routine to provide a motorized closing function for an adjustable locking element (5) of the motor vehicle (6), wherein the control arrangement (1) comprises an electrical energy storage device (8), wherein the energy storage device (8) provides an emergency electrical supply voltage for the control arrangement (1) in an emergency operation, in particular in the event of a failure of a normal supply voltage of the motor vehicle (6), and wherein the control arrangement (1) is configured to charge the energy storage device (8) based on the normal supply voltage.It is proposed that the control unit (7) performs the charging by switching the normal supply voltage to the energy storage device (8) via one of the two half-bridges of the H-bridge circuit (3).

Description

[0001] The present invention relates to a control arrangement for the operation of a motor vehicle locking system according to the preamble of claim 1, a motor vehicle locking system according to claim 7 and a method for the operation of a motor vehicle locking system according to the preamble of claim 11.

[0002] The vehicle locking system in question is used for all types of motorized locking functions for locking elements of a motor vehicle. This includes, in particular, locking elements such as side doors, rear doors, tailgates, trunk lids, hoods, and the like. These locking elements can be designed as either swing or sliding doors. The motorized locking function includes, among other things, a vehicle lock associated with the vehicle locking system and, preferably, a closing assistance function. For example, to increase convenience, a closing assistance process is performed from a pre-locking state to a fully locked state of the vehicle lock, so that the final part of the closing movement of the locking element, which must be accomplished against the internal sealing pressure, is motor-assisted.

[0003] The known prior art (DE 10 2023 119 076 A1), from which the invention is based, relates to the operation of a motor vehicle locking system with a motor vehicle lock comprising a latch and a pawl as locking elements. The latch can be moved into a closed position in which it is engaged with the locking part and secured by the pawl. The motor vehicle lock is further equipped with an electric opening drive with which the pawl can be lifted, so that the latch, releasing the locking part, can be adjusted to its open position.

[0004] In order to meet the requirements for the safety of the power supply of such motor vehicle locks, the known control arrangement has a rechargeable energy storage device, which ensures the electrical power supply of the opening drive via an emergency supply voltage even in an emergency operation, in particular in the event of a failure of a normal supply voltage.

[0005] A charging circuit is provided which charges the energy storage device based on the normal supply voltage. In the known control arrangement (DE 10 2023 119 076 A1), the gate driver of the opening actuator is used to further control an active charging circuit, thus saving components and therefore costs and installation space.

[0006] The invention is based on the problem of designing and further developing a generic control arrangement with an energy storage device in such a way that a further simplification is achieved with regard to charging the energy storage device.

[0007] The above problem is solved by the features of claim 1.

[0008] The fundamental consideration is that not only can the gate driver be used for dual purposes, controlling an electric drive motor and charging the energy storage device, but an H-bridge circuit with two half-bridges is also provided for controlling the drive motor. Particularly when the drive motor is used for the closing assistance function, the switching elements of the H-bridge circuit are designed to be sufficiently powerful so that the same switching elements can also be used to quickly charge a double-layer capacitor of the energy storage device. With the proposed solution, additional components for the charging circuit are therefore not strictly necessary to achieve optimal operation of the drive motor and energy storage device.

[0009] Specifically, it is proposed that the control unit performs the charging by switching the normal supply voltage to the energy storage device via one of the two half-bridges of the H-bridge circuit.

[0010] Preferably, according to claim 2, pulsed charging is carried out by switching on the half-bridge, thereby effectively adjusting the charging voltage for the energy storage device. More preferably, charging is carried out via an intermediate choke, as specified in claim 3.

[0011] Particularly preferred is the use of an integrated gate driver, which handles the control of the H-bridge circuit both in the control routine and during the charging of the energy storage device (claim 4). The half-bridges, on the other hand, can be constructed using a discrete circuit, allowing for the simple selection of switching elements based on the power requirements of the drive. Furthermore, the switching elements can be added or retrofitted depending on whether the electric drive motor is intended for the respective vehicle locking system or not.

[0012] Claims 5 and 6 relate to embodiments with decoupling of the energy storage device and the drive motor from the half-bridges. Decoupling the drive motor ensures the availability of the energy storage device even in the event of a fault, such as a short circuit to ground or to the supply potential.

[0013] According to a further teaching as claimed in claim 7, which has independent significance, a motor vehicle locking system is claimed, comprising a drive with an electric drive motor for providing a motorized locking function for an adjustable locking element of a motor vehicle and comprising a proposed control arrangement. Reference may be made to all descriptions of the proposed control arrangement.

[0014] The drive is particularly preferred for the aforementioned assisted locking function of a motor vehicle lock, as specified in claims 8 and 9. In this context, the switching elements of the H-bridge circuit, designed for high currents and longer actuation times, are ideally suited for rapid charging of the energy storage device, allowing the dual use of the H-bridge circuit to be achieved essentially without compromise. An opening drive for the motor vehicle lock, which is also controlled by the control arrangement, can additionally be provided (claim 10).

[0015] According to a further teaching as claimed in claim 11, which also has independent significance, a method for operating a motor vehicle locking system is claimed. It is essential that the control unit performs the charging by switching the normal supply voltage to the energy storage device via one of the two half-bridges of the H-bridge circuit. Reference may be made to all descriptions of the proposed control arrangement and the proposed motor vehicle locking system.

[0016] The invention will now be explained in more detail with reference to a drawing that merely illustrates exemplary embodiments. The drawing shows Fig. 1. A schematic, perspective representation of a motor vehicle with a proposed motor vehicle locking system and a motor vehicle lock with a proposed control arrangement in a partially disassembled side view and Fig. 2 a schematic representation of the proposed tax arrangement.

[0017] The invention relates to a control arrangement 1 for operating a motor vehicle locking system 2. The control arrangement 1 comprises an H-bridge circuit 3 with two half-bridges, which is provided for controlling an electric drive motor 4 of the motor vehicle locking system 2. The H-bridge circuit 3 comprises circuit components, shown here and in the illustration. Fig. Two switching elements Q1, Q2, Q3, Q4, which form the two half-bridges and which supply the electric drive motor 4 with electrical power. The electrical power flow to the drive motor 4 runs via the half-bridges and preferably via the switching elements Q1, Q2, Q3, Q4.

[0018] The term "drive motor" encompasses all types of electric actuators, in particular rotary and linear actuators. Preferably, the drive motor 4 is a rotary electric motor.

[0019] The control arrangement 1, in a control routine, controls the drive motor 4 via the two half-bridges to provide a motorized locking function for an adjustable locking element 5 of the motor vehicle 6. A motorized locking function is generally understood to mean that the adjustable locking element 5 of the motor vehicle 6 is adjusted, released, opened, or closed, and / or locked or unlocked, directly or indirectly, by a movement generated by the electric drive motor 4. Particularly preferably, the motorized locking function relates to an auxiliary locking function, which is explained below.

[0020] Regarding the design of the locking element 5, reference may be made to the introductory statements, whereby in the present case in Fig. Figure 1 illustrates the functioning of the motor vehicle locking system 2 for a locking element 5 designed as a side door. However, all descriptions also apply to all other types of locking elements 5 of the motor vehicle 6.

[0021] The control arrangement 1 includes a control unit 7, such as a microprocessor, for implementing the control tasks associated with the motorized locking function. For example, the control unit 7 can query sensor signals from a position sensor of the vehicle locking system 2 to trigger the control routine. If, for example, a predetermined output state associated with the adjusting element is detected, the control unit 7 can trigger the actuation of the drive motor 4 by means of the H-bridge circuit 3.

[0022] The H-bridge circuit 3 and the two half-bridges allow the drive motor 4 to be controlled in different directions. For example, the control routine includes controlling the drive motor 4 in a first direction, for instance, for a predetermined control duration and / or until a predetermined end state of the closing function, associated with the adjusting element, is detected. Preferably, the drive motor 4 is further controlled in a second direction, opposite to the first, which, for example, resets mechanical components coupled to the drive motor 4. Both half-bridges are connected to the drive motor 4 to control it in both directions.

[0023] The control arrangement 1 includes an electrical energy storage device 8, which provides an emergency electrical supply voltage for the control arrangement 1 in emergency operation, particularly in the event of a failure of the normal supply voltage of the motor vehicle 6. Examples of emergency operation include a failure of the vehicle's electrical system, such as due to a near-complete discharge of the central battery of the motor vehicle 6 or a failure of electrical wiring in the vehicle's electrical system, and a crash involving the motor vehicle 6. Based on the emergency supply voltage, the functionality of the control arrangement 1, and in particular the control unit 7, can be at least partially ensured even in emergency operation.

[0024] The energy storage device 8 is designed to be rechargeable and preferably includes at least one capacitor 9. As shown, the energy storage device 8 can have exactly one capacitor 9. In a further embodiment, several capacitors are provided, which are generally connected electrically in parallel and / or in series. Preferably, the several capacitors are at least partially connected in series to provide the capacitor voltage. A boosting arrangement, not shown here, can be provided downstream of the at least one capacitor 9, which, in emergency operation, boosts the capacitor voltage of the at least one capacitor 9 to the emergency supply voltage.

[0025] Preferably, a double-layer capacitor is provided as capacitor 9. In a double-layer capacitor, energy storage takes place in an electrochemical double layer, also known as a "Helmholtz layer". Such a double-layer capacitor is also referred to as a "supercapacitor", "supercap", "ultracap" or the like.

[0026] The control arrangement 1 is configured to charge the energy storage device 8 based on the normal supply voltage. Preferably, the control arrangement 1 implements a charging routine for the energy storage device 8, in which the energy storage device 8 is charged using a predefined charging strategy. Here, and preferably, a voltage and / or current sensor 10 is provided, with which the control arrangement 1 monitors the capacitor voltage and / or the charging current during the charging routine. For example, the energy storage device 8, specifically the at least one capacitor 9, is charged with a constant charging current based on the normal supply voltage and subsequently with a constant charging voltage. Other configurations of the charging strategy are conceivable. Based on the normal supply voltage, an 'active' charging control is implemented, in which the normal supply voltage is applied to the energy storage device 8 in a specific manner and, in particular, converted.

[0027] The essential point is that the control unit 7 performs the charging by switching the normal supply voltage to the energy storage device 8 via one of the two half-bridges of the H-bridge circuit 3.

[0028] The power flow for charging the energy storage device 8 thus runs via one of the two half-bridges, which is used in the control routine for the drive motor 4. This allows not only a gate driver 11 to be used for controlling the switching elements Q1, Q2, Q3, Q4 for both the control routine and the charging process, but also enables components of the H-bridge circuit 3 designed for power flow to be used for a dual purpose.

[0029] In the representation from Fig. 2. The switching elements Q3 and Q4 are used to control the drive motor 4 in the drive directions and also to influence the energy storage device 8. A charging voltage based on the normal supply voltage can be provided to the energy storage device 8 via the switching element Q3. It is also conceivable to discharge the energy storage device 8 via the switching element Q4, which is done, for example, for diagnostic purposes, such as determining the capacitance and / or the ESR of the capacitor 9. Consequently, a charging circuit 12 for the energy storage device 8 is used, as shown in Fig. 2 indicated, formed via a part of the H-bridge circuit 3.

[0030] Furthermore, it is preferably provided that the control unit 7 performs pulsed charging via a time-controlled switching of the normal supply voltage to the energy storage device 8 via the half-bridge.

[0031] The term "half-bridge" here refers to the half-bridge of the H-bridge circuit 3 intended for dual use. Pulsed charging preferably converts the normal supply voltage into a (time-averaged) lower charging voltage. Pulsed charging preferably enables the implementation of the previously mentioned charging strategy.

[0032] Furthermore, and preferably, a choke 13 is provided between the H-bridge circuit 3 and the energy storage device 8 for charging. The choke 13 is preferably used for converting the normal supply voltage into the charging voltage in conjunction with pulsed switching on of the normal supply voltage.

[0033] Furthermore, and preferably, the H-bridge circuit 3 with the two half-bridges is designed as a discrete circuit. The switching elements Q1, Q2, Q3, Q4 can thus be designed as discrete components such as separate transistors. Preferably, however, the half-bridges are arranged on a control board, on which the control unit 7 and, in particular, further electronic components of the control arrangement 1 are also provided.

[0034] Here, and preferably, a gate driver 11 is provided which operates the switching elements Q1, Q2, Q3, Q4 of the H-bridge circuit 3. The gate driver 11 can be implemented as an integrated component. Preferably, the gate driver 11 is also arranged on the control board.

[0035] The drive motor 4 can also be controlled via pulse width modulation. It is conceivable that the pulse frequency during charging of the energy storage device 8 and the pulse frequency for controlling the drive motor 4 are of the same order of magnitude and, in particular, are identical. However, the control and charging can also take place in different frequency ranges. Preferably, the pulse frequency during charging of the energy storage device 8 is at least one order of magnitude higher than the pulse frequency for controlling the drive motor 4.

[0036] Furthermore, and preferably, an energy storage decoupling 14 is provided between the H-bridge circuit 3 and the energy storage device 8 to prevent a current flow from the energy storage device 8 to the H-bridge circuit 3 and / or to prevent a current flow from the H-bridge circuit 3 to the energy storage device 8, particularly in the control routine.

[0037] The energy storage decoupling 14 ensures, in particular, that the control of the drive motor 4 in the control routine is independent of the charging or discharging of the energy storage device 8. The energy storage decoupling 14 preferably comprises two switching elements Q5 and Q6 with opposite reverse bias. Switching element Q5 prevents the current flow from the energy storage device 8 to the H-bridge circuit 3. Switching element Q6 prevents the current flow from the H-bridge circuit 3 to the energy storage device 8. Switching elements Q5 and Q6 are preferably implemented as transistors, which are operated via a decoupling driver, which is preferably also provided by the gate driver 11. The gate driver 11, for example, has a charge pump that boosts a supply voltage of the control unit 7 to a gate voltage of the switching elements Q5 and Q6.

[0038] Furthermore, a drive motor decoupling 16 is preferably provided between the H-bridge circuit 3 and the drive motor 4, which prevents a current flow from the half-bridge center point of the half-bridge to ground and / or normal supply voltage.

[0039] The drive motor decoupling 16 ensures, in particular, that controlled charging and discharging of the energy storage device 8 is possible even if the drive motor 4 and / or the electrical connection between the drive motor 4 and the H-bridge circuit 3 is faulty. The drive motor decoupling 16 preferably comprises two switching elements Q7 and Q8 with opposing blocking directions. In the event of a fault, switching element Q7 prevents a connection between the half-bridge center point between switching elements Q3 and Q4 and ground via the terminals of the drive motor 4 outside the control arrangement, so that the energy storage device 8 can still be charged even in this fault condition.In the event of a fault, switching element Q8 prevents a connection between the half-bridge center point between switching elements Q3 and Q4 and the normal supply voltage via the terminals of the drive motor 4 outside the control arrangement, so that the energy storage device 8 can still be discharged even in this fault condition. Switching elements Q7 and Q8 are preferably implemented as transistors, which are also switched via a decoupling driver, in particular via the gate driver 11.

[0040] In principle, the energy storage decoupling 14 can be enabled in the charging routine and disabled in the control routine. The drive motor decoupling 16 can be disabled in the charging routine and enabled in the control routine.

[0041] According to a further teaching, a motor vehicle locking system 2 is proposed, comprising a drive 17 with an electric drive motor 4 for providing a motorized locking function for an adjustable locking element 5 of a motor vehicle 6 and comprising a proposed control arrangement 1. Reference may be made to all descriptions of the proposed control arrangement 1.

[0042] Furthermore, a motor vehicle lock 18 is preferably provided for the locking element 5 of the motor vehicle 6. The motor vehicle lock 18 is in Fig. 1 is shown in a partially disassembled side view and is equipped with a latch 19 pivotable about a latch axis for holding engagement with a locking element 20 and a locking pawl 21 associated with the latch 19 and pivotable about a pawl axis. The locking element 20 can be a locking bolt, a locking pin, or the like. For example, the vehicle lock 18 is arranged on a locking element 5, while the locking element 20 is fixed to the vehicle body 6.

[0043] The locking pawl 21 can be moved into a Fig. 1. The latch 21 is brought into the inverted position shown, in which it holds the lock latch 19 in the main closed position shown. In principle, the latch 21 can also be part of a latch system consisting of two or more sequentially arranged latches assigned to the lock latch 19.

[0044] Preferably, the control arrangement 1 is integrated into the vehicle lock 18. The energy storage device 8 can be integrated into the vehicle lock 18 and, in particular, arranged in a common housing with the mechanical lock components. Alternatively, it is conceivable that the control arrangement 1 is part of a separate control unit 22 for the vehicle lock 18. Examples of such a control unit 22 are a flap control unit and a door control unit, which can also perform other electronic functions in the locking element 5. However, a control unit 22 is not necessarily part of the vehicle locking system 2.

[0045] Particularly preferred is an external drive 17 with an electric drive motor 4 for the vehicle lock 18. Even with the aforementioned configuration of a control arrangement 1 integrated in the vehicle lock 18, it is possible to control an external drive 17 for the vehicle lock 18.

[0046] In a particularly preferred embodiment, the drive motor 4 is provided as a closing aid for the vehicle lock 18. Here, and preferably, the drive motor 4 is provided separately from the vehicle lock 18 as part of the external drive 17, but in an alternative embodiment, it can also be integrated into the vehicle lock 18. The drive 17, as shown in the illustration, causes Fig. 1. The application of a drive force via a Bowden cable to a lock component of the motor vehicle lock 18. Here, and preferably, the lock latch 19 is adjusted as the lock component, whereby, for example, a motorized adjustment of the locking part 20 is also conceivable. The drive 17 is in Fig. 1 is only shown schematically and can act on the lock component via a mechanical closing aid arrangement of the motor vehicle lock 18, which, for example, has a lock latch lever that can be engaged with the lock latch 19 to exert a closing force.

[0047] The control routine implements a closing assistance routine in which the vehicle lock 18 is preferably transferred from an initial state to a main closed state by moving the lock latch 19 into the Fig. The main locking position shown in Figure 1 is brought into the main locking position. In the main locking position, the locking pawl 21 is engaged with a main latch 23 of the lock bolt. The initial position is preferably a pre-locking position (not shown) in which the locking pawl 21 can be engaged with a pre-latch 24 of the lock bolt 19.

[0048] In addition to the aforementioned advantages regarding the design of the switching elements Q1, Q2, Q3, Q4, the dual use of the H-bridge circuit 3 has the further advantage that the closing assistance function is only used sporadically when the locking element 5 is closed. During the remaining time, the charging and / or discharging of the energy storage device 8 can therefore take place without any problems.

[0049] Furthermore, and preferably, it is provided here that the motor vehicle lock 18 additionally has an electric opening drive 25 for the motorized release of the locking pawl 21, which can be controlled by means of the control arrangement 1. The motorized release of the locking pawl 21 corresponds in Fig. 1. The locking pawl 21 pivots clockwise around its axis. The motorized release of the locking pawl 21 is triggered by an operating event, such as manual operation of a door handle 26, for example in conjunction with an electronic key query, and can be controlled via the control arrangement 1 and, in particular, the control unit 7. Preferably, the control arrangement 1 includes a further motor driver, not shown, for the opening drive 25.

[0050] Preferably, in emergency operation, the energy storage device 8 provides the emergency electrical supply voltage for controlling the opening drive 25. This allows the special safety requirements of motor vehicle locks 18 to be met. Control of the drive 17, particularly for the closing assistance function, can also be carried out in emergency operation via a supply from the energy storage device 8 or be prevented to save energy.

[0051] According to a further teaching, a method for operating a motor vehicle locking system 2 is proposed, wherein a control arrangement 1 has an H-bridge circuit 3 with two half-bridges, wherein the control arrangement 1, in a control routine, controls an electric drive motor 4 of the motor vehicle locking system 2 via the two half-bridges in order to provide a motorized locking function for an adjustable locking element 5 of the motor vehicle 6, wherein the control arrangement 1 has an electrical energy storage device 8, wherein the energy storage device 8 provides an emergency electrical supply voltage for the control arrangement 1 in an emergency operation, in particular in the event of a failure of a normal supply voltage of the motor vehicle 6, and wherein the control arrangement 1 is configured to charge the energy storage device 8 based on the normal supply voltage.

[0052] It is provided that the control unit 7 performs the charging by switching the normal supply voltage to the energy storage device 8 via one of the two half-bridges of the H-bridge circuit 3. Reference may be made to all descriptions of the proposed control arrangement 1 and the proposed vehicle locking system 2. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2023 119 076 A1 [0003, 0005]

Claims

[1] Control arrangement for the operation of a motor vehicle locking system (2), wherein the control arrangement (1) comprises an H-bridge circuit (3) with two half-bridges, wherein the control arrangement (1) in a control routine controls an electric drive motor (4) of the motor vehicle locking system (2) via the two half-bridges to provide a motorized locking function for an adjustable locking element (5) of the motor vehicle (6), wherein the control arrangement (1) comprises an electrical energy storage device (8), wherein the energy storage device (8) provides an emergency electrical supply voltage for the control arrangement (1) in an emergency operation, in particular in the event of a failure of a normal supply voltage of the motor vehicle (6), and wherein the control arrangement (1) is configured to charge the energy storage device (8) on the basis of the normal supply voltage, characterized by , that the control unit (7) performs the charging by switching the normal supply voltage to the energy storage device (8) via one of the two half-bridges of the H-bridge circuit (3). [2] Tax arrangement according to claim 1, characterized by , that the control unit (7) performs pulsed charging by switching the normal supply voltage to the energy storage device (8) via the half-bridge in a time-controlled manner. [3] Tax arrangement according to claim 1 or 2, characterized by , that a choke (13) (16) is provided between the H-bridge circuit (3) and the energy storage device (8) for charging. [4] Tax arrangement according to claim 1 or 2, characterized by , that the H-bridge circuit (3) with the two half-bridges is designed as a discrete circuit and with a gate driver (11) for the half-bridges designed as an integrated component. [5] Tax arrangement according to one of the preceding claims, characterized by, that an energy storage decoupling (14) between the H-bridge circuit (3) and the energy storage device (8) is provided to prevent a current flow from the energy storage device (8) to the H-bridge circuit (3) and / or to prevent a current flow from the H-bridge circuit (3) to the energy storage device (8), in particular in the control routine. [6] Tax arrangement according to one of the preceding claims, characterized by , that a drive motor decoupling (16) is provided between the H-bridge circuit (3) and the drive motor (4), which prevents a current flow from the half-bridge center point of the half-bridge to ground and / or normal supply voltage. [7] Motor vehicle locking system comprising a drive (17) with an electric drive motor (4) for providing a motorized locking function for an adjustable locking element (5) of a motor vehicle (6) and comprising a control arrangement (1) according to one of the preceding claims. [8] Motor vehicle locking system according to claim 7, characterized by , that a motor vehicle lock (18) is provided for the locking element (5) of the motor vehicle (6), that the motor vehicle lock (18) is equipped with a lock latch (19) for holding engagement with a locking part (20) and a locking pawl (21) associated with the lock latch (19). [9] Motor vehicle locking system according to claim 8, characterized by , that an external drive (17) with the electric drive motor (4) is provided for the motor vehicle lock (18), preferably that the external drive (17) is provided as a closing function to assist the motor vehicle lock (18), in particular to bring the motor vehicle lock (18) into a main closed state. [10] Motor vehicle locking system according to 8 or 9, characterized by, that the motor vehicle lock (18) additionally has an electric opening drive (25) for the motorized lifting of the locking pawl (21), which can be controlled by means of the control arrangement (1), preferably that the energy storage device (8) provides the emergency electrical supply voltage for controlling the opening drive (25) in emergency operation. [11] Method for operating a motor vehicle locking system (2), wherein a control arrangement (1) comprises an H-bridge circuit (3) with two half-bridges, wherein the control arrangement (1) in a control routine controls an electric drive motor (4) of the motor vehicle locking system (2) via the two half-bridges to provide a motorized locking function for an adjustable locking element (5) of the motor vehicle (6), wherein the control arrangement (1) comprises an electrical energy storage device (8), wherein the energy storage device (8) provides an emergency electrical supply voltage for the control arrangement (1) in an emergency operation, in particular in the event of a failure of a normal supply voltage of the motor vehicle (6), and wherein the control arrangement (1) is configured to charge the energy storage device (8) based on the normal supply voltage, characterized by, that the control unit (7) performs the charging by switching the normal supply voltage to the energy storage device (8) via one of the two half-bridges of the H-bridge circuit (3).

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