Electronic pump motor control unit for a high-voltage pump device and high-voltage pump device with an electronic pump motor control unit

Abstract

The invention is directed to an electronic pump motor control unit (10) for a high-voltage pump device (100), in particular for a traction battery vehicle (200), with a low-voltage domain (LV) supplied by a low-voltage power supply (60), a high-voltage domain (HV) supplied by a high-voltage power supply (50) for driving the pump device (100), wherein the low-voltage domain (LV) and the high-voltage (HV) domain are galvanically isolated from each other, a low-voltage microcontroller (20) being located within the high-voltage domain (HV), a galvanically isolated energy transfer interface (30) for transferring low-voltage electrical energy from the low-voltage domain (LV) to the microcontroller (20), wherein the microcontroller (20) is electrically supplied by the output voltage (35) of the galvanically isolated energy transfer interface (30), and a modulation device (40) at the low- voltage domain (LV) for modulating the frequency and / or the voltage level of the output voltage (35), wherein the microcontroller (20) is configured to detect the modulation of the frequency and / or the voltage level of the output voltage (35). The modulation of the frequency and / or the voltage level of the output voltage (35) allows to transfer a coding signal or any other information from the low-voltage domain (LV) to the microcontroller (20), without using a conventional galvanically isolated digital signal transfer interface (70).

Description

[0001] D E S C R I P T I O N

[0002] Electronic pump motor control unit for a high-voltage pump device and high-voltage pump device with an electronic pump motor control unit

[0003] The invention is directed to an electronic pump motor control unit for a high-voltage pump device and to a high-voltage pump device with an electronic pump motor control unit.

[0004] Traction battery vehicles or so-called battery-electric vehicles are usually provided with two different voltage domains, namely a high-voltage domain and a low-voltage domain. The high-voltage domain comprises a high- voltage traction battery for supplying the high-voltage electric traction motors as well as other high-voltage auxiliary components, for example high-voltage pump devices with an output of at least 1 kW up to 10 kW. The low-voltage domain comprises, for example, the low-voltage body control module of the vehicle with the low-voltage electronic control units. The high-voltage domain and the low-voltage domain are galvanically isolated from each other to protect the passengers from high electric voltages of the high-voltage domain which can be up to 800 Volts or even more.

[0005] A high-voltage pump device is provided with an electronic pump motor control unit which also comprises a high-voltage domain and a low-voltage domain, each voltage domain of the pump being electrically connected to the corresponding vehicle voltage domain. The electronic pump motor control unit receives a coding signal from a vehicle electronic control unit via a coding pin of a plug connector between the electronic pump motor control unit and the vehicle electronic control unit within the low-voltage domain. The coding signal is needed to correctly address the electronic pump motor control unit so that the electronic pump motor control unit receives or selects the correct control signals from the vehicle electronic control unit. The coding signal is transferred to a microcontroller being located within the high-voltage domain by a galvanically isolated digital signal transfer interface, for example by an optocoupler. Such a galvanically isolated digital signal transfer interface is provided with a limited number of signal transfer channels. Some specific pump applications require a larger number of signal transfer channels than being provided by a conventional galvanically isolated digital signal transfer interface so that an additional digital signal transfer interface would be required that causes additional costs.

[0006] It is an object of the present invention to provide an alternative type of signal transfer from the low-voltage domain to the high-voltage domain without using a galvanically isolated digital signal transfer interface.

[0007] This object is achieved by an electronic pump motor control unit for a high- voltage pump device according to main claim 1.

[0008] An electronic pump motor control unit for a high-voltage pump device, in particular for a traction battery vehicle comprises a low-voltage domain which is generally provided with a voltage below 60 V. The low-voltage domain is supplied by a low-voltage power supply which is preferably a 12 V direct current (DC) power source, for example, a conventional 12 V onboard vehicle battery or a high-voltage traction battery using a converter which reduces the relatively high voltage level to 12 V. The low-voltage domain is electrically connected to a body control module of the vehicle which comprises an electronic control unit for providing control signals to the electronic pump motor control unit.

[0009] The electronic pump motor control unit further comprises a high-voltage domain supplied by a high-voltage power supply which also supplies a high- voltage pump electric drive motor of the high-voltage pump device. The high-voltage domain of the pump device is therefor electrically connected to a high-voltage traction battery of the traction battery vehicle which also electrically supplies the electric traction motors of the traction battery vehicle. Typical voltage levels of the high-voltage domain are 400 V or 800 V but can alternatively be lower or higher than 400 V or 800 V. Because of the high voltage levels of the high-voltage domain, the high-voltage domain is galvanically isolated from the low-voltage domain to protect the passengers or other persons which come in contact with the vehicle from high-voltage electric strokes.

[0010] The electronic pump motor control unit further comprises a low-voltage microcontroller which is located within the high-voltage domain. The microcontroller receives control signals from the vehicle electronic control unit and accordingly controls the electric drive motor of the high-voltage pump device. The microcontroller usually runs on relatively low voltage levels, for example between 15 V and 20 V, and is therefore electrically supplied by the low-voltage power supply of the low-voltage domain.

[0011] Since the microcontroller is located within and electrically connected to the galvanically isolated high-voltage domain, the electronic pump motor control unit comprises a galvanically isolated energy transfer interface for transferring low-voltage electrical energy from the low-voltage domain to the microcontroller. Such a galvanically isolated energy transfer interface can be, for example, an inductive coupling element which inductively transfers electrical energy from the low-voltage domain to the microcontroller without a direct electrical connection. Accordingly, the galvanically isolated energy transfer interface comprises an input member within the low-voltage domain which is galvanically isolated from an output member within the high-voltage domain. The microcontroller is electrically connected to the output member of the galvanically isolated energy transfer interface and is therefore electrically supplied by the output voltage of the galvanically isolated energy transfer interface, wherein in a state-of-the-art electronic pump motor control unit, the output voltage is at a relatively constant voltage level of, for example, 18 V.

[0012] According to the invention, the electronic pump motor control unit comprises a modulation device at the low-voltage domain for modulating the frequency and / or the voltage level of the output voltage. Furthermore, the microcontroller is configured to detect the modulation of the frequency and / or the voltage level of the output voltage to thereby transfer a coding signal from the vehicle electronic control unit to the electronic pump motor control unit, in particular to the microcontroller of the electronic pump motor control unit. The coding signal can be provided by a coding pin of a vehicle-sided plug connector between the vehicle electronic control unit and the electronic pump motor control unit to correctly address the electronic pump motor control unit within the bus system of the vehicle so that the electronic pump motor control unit receives or selects the correct control signals from the vehicle electronic control unit.

[0013] Usually, a traction battery vehicle comprises several pump devices which receive different control signals from the vehicle electronic control unit. Each pump device is therefore provided with an individual address within the vehicles bus system, which can be a CAN-, LIN-, or any other bus that is suitable for a vehicle electronic control unit, so that every pump device listens to the correct control signals depending on its position and its function within the vehicle. As a result, several identical pump devices can be applicated in different positions and with different functions within the vehicle without the necessity of an individual programming of the microcontroller of each electronic pump motor control unit.

[0014] By modulating the frequency and / or the voltage level of the output voltage during the start-up phase, i.e. immediately after starting the vehicle, the individual coding signal is transferred from the low-voltage domain to the microcontroller via the galvanically isolated energy transfer interface so that the microcontroller recognises the correct control signal which is assigned to the pump device. The microcontroller receives the corresponding control signal from the vehicle control unit and correspondingly controls the electric drive motor of the pump device depending on its position and its function within the vehicle.

[0015] The galvanically isolated energy transfer interface requires an alternating current input to transfer energy from the low-voltage domain to the high- voltage domain, so that the DC from the low-voltage power supply is converted to an alternating current (AC), for example by an inverter. The frequency of the AC is set to a defined constant value which can be modulated by the modulation device to transfer an additional information. The modulation of the AC frequency allows a transfer of the coding signal by assigning specific frequency values to specific bus addresses of the bus system. For example, if the set constant AC frequency in normal operation mode is 1000 Hz, the frequency in the start-up phase, before the coding signal is transferred, can be modulated to a value of 1100 Hz, 900 Hz, 800 Hz or 700 Hz to transfer an individual coding signals, wherein each frequency value defines a separate individual coding signal. The microcontroller detects the modulated frequency value within the start-up phase and thereby receives the coding signal and the corresponding bus address of the electronic pump motor control unit within the vehicle electronic control unit.

[0016] In another aspect of the invention, the modulation device modulates the voltage level of the output voltage of the galvanically isolated energy transfer interface in the start-up phase. The modulation device thereto varies the voltage level of the constant output voltage to different predefined values, wherein every voltage value is assigned to a specific bus address of the bus system. The microcontroller detects the modulated voltage value within the start-up phase and thereby receives the coding signal and the corresponding bus address of the electronic pump motor control unit within the vehicle electronic control unit to receive the correct control signal depending on the position and the function of the pump device within the vehicle. For example, if the supply voltage of the microcontroller during the normal operation mode, i.e. if the vehicle is not in the start-up phase, is about 18 V, the voltage level is varied to values of 16 V, 17 V or 19 V, so that at least four different coding voltages can be set, wherein the set coding voltage is then transferred to the microcontroller during the start-up phase and is detected by the microcontroller to receive the coding information.

[0017] In conclusion, the present invention allows to transfer a coding signal of the coding pin of the vehicle-sided plug connector via the galvanically isolated energy transfer interface to the microcontroller so that the digital signal transfer interface is not needed anymore to transfer the coding signal. Besides the transfer of the coding signal, the modulation of the frequency and / or the voltage level of the output voltage allows to transfer any other digital information from the low-voltage domain to the microcontroller via the galvanically isolated energy transfer interface.

[0018] In a preferred embodiment of the present invention, the modulation device comprises a resistor circuit with several ohmic resistors wherein the resistors being individually switchable to define the voltage level of the output voltage. The ohmic resistors are connected such that a resistive voltage divider is defined. The resistor circuit comprises at least one switch which allows to individually connect / disconnect single resistors to / from the resistors circuit to change the total resistance value of the resistor circuit. The at least one switch is therefore switched automatically by the coding pin of the vehicle-sided plug connector. By changing the total resistance value of the resistor circuit in the start-up phase, the voltage level of the input voltage of the galvanically isolated energy transfer interface can be varied which results in a variation of the voltage level of the output voltage of the galvanically isolated energy transfer interface to transfer the coding signal to the microcontroller.

[0019] In a continuative embodiment of the invention, the resistor circuit comprises two switches for connecting / disconnecting the resistors. If the resistor circuit, for example, comprises four resistors in total, the application of two switches allows to define four different voltage values, to individually address four separate (identical) pump devices within the start-up phase. The plug connector therefor comprises two coding pins for providing a 2-bit coding signal, which electronically activates / deactivates the switches to realize four different switching states of the resistor circuit with the two switches.

[0020] In another preferred embodiment of the invention, a separate galvanically isolated digital signal transfer interface is provided for transferring digital signals between the low-voltage domain and the high-voltage domain. The galvanically isolated digital signal transfer interface, for example, allows to transfer signals from the microcontroller to the low-voltage domain, in particular to the vehicle electronic control unit. The galvanically isolated digital signal transfer interface is preferably provided with a double isolation to fulfil the security standards of a traction battery vehicle with a high- voltage traction battery of, for example, about 800 V. Such a double isolated digital signal transfer interface is usually provided with four separate transfer channels for transferring signals between the low-voltage domain and the high-voltage domain.

[0021] In a continuative embodiment, the galvanically isolated digital signal transfer interface is provided with one single transfer channel for transferring signals from the low-voltage domain to the high-voltage domain. The other three transfer channels of the double isolated digital signal transfer interface are defined such that signals can only be transferred from the high-voltage domain to the low-voltage domain. As a result, the transfer of the coding signal from the low-voltage domain to the microcontroller cannot be provided via the existing galvanically isolated digital signal transfer interface so that, without the invention, an additional galvanically isolated digital signal transfer interface would be required. The transfer of the coding signal via the galvanically isolated energy transfer interface therefore allows to applicate only one single double isolated digital signal transfer interface resulting in relatively low material costs.

[0022] In another preferred embodiment of the invention, the microcontroller is configured to deactivate the modulation device. Since the at least one switch of the resistors circuit is automatically switched by the coding pin of the vehicle-sided plug connector, it is beneficial to deactivate the modulation functionality of the modulation device in the normal operation mode of the vehicle, after the microcontroller has received the coding signal. The microcontroller is therefore configured to send a deactivation signal via the galvanically isolated digital signal transfer interface to the low-voltage domain which provides a reset of the at least one switch of the resistor circuit to provide a constant voltage level of the output voltage of, for example, 18 V in the normal operation mode of the vehicle which is the optimal supply voltage of the microcontroller.

[0023] In another preferred embodiment of the invention, the galvanically isolated energy transfer interface is defined by a flyback converter device. The flyback converter comprises at least two windings, one input winding being provided with the input voltage within the low-voltage domain and one output winding being provided with the output voltage within the high- voltage domain providing an inductive energy transfer from the low-voltage domain to the high-voltage domain.

[0024] In a continuative embodiment of the invention, the flyback converter device comprises a feedback circuit within the low-voltage domain. The feedback circuit controls and limits the input and output voltage of the windings to avoid a critical voltage increase in particular within the high-voltage domain to protect the microcontroller or other semiconductors from damages. For this purpose, the feedback circuit comprises an auxiliary winding within the low-voltage domain being inductively coupled to the output winding to estimate the voltage level of the output voltage. Additionally, at least one ohmic resistor is provided within the feedback circuit to define a constant basic input voltage level at the input winding of the flyback converter device within the low-voltage domain.

[0025] In another continuative embodiment of the invention, the resistor circuit is part of the feedback circuit. Accordingly, the feedback circuit is provided with several ohmic resistors which are arranged such that a resistive voltage divider is defined, wherein the voltage level of the input voltage and, as a result, the voltage level of the output voltage of the flyback converter can be varied as described above, for example, by using one or more switches being automatically switched by the coding pin of the vehicle-sided plug connector.

[0026] The object of the present invention is further achieved by a high-voltage pump device with an electronic pump motor control unit according to claim 9.

[0027] A high-voltage pump device according to the invention comprises a high- voltage pump drive motor with an output of at least 1 kW up to 10 kW, the high-voltage pump drive motor being electrically supplied by a traction battery of a traction battery vehicle, wherein the voltage of the traction battery is preferably about 800 V, but alternatively can be lower or higher than 800 V. The high-voltage pump device is provided with an electronic pump motor control unit according to the invention as described above.

[0028] The object of the present invention is further achieved by a traction battery vehicle according to claim 11. A traction battery vehicle according to the invention comprises at least one high-voltage pump device with a high-voltage pump drive motor with an output of at least 500 W up to 10 kW. The high-voltage pump device is provided with an electronic pump motor control unit according to the invention as described above and comprises a pump-sided plug connector.

[0029] The traction battery vehicle comprises a vehicle-sided plug connector being connected to the pump-sided plug connector to electrically connect the electronic pump motor control unit to the body control module and in particular to the electronic control unit of the traction battery vehicle. The vehicle-sided plug connector comprises at least one preferably to coding pins which provide a coding signal for the modulation device, wherein the modulation device modulates the frequency and / or at the output voltage level depending on the coding signal.

[0030] In another embodiment of the invention, the traction battery vehicle comprises several high-voltage pump devices, wherein each pump-sided plug connector is connected to a separate vehicle-sided plug connector. Generally, the coding signal for the microcontroller of each electronic pump motor control unit is based on the coding of the vehicle-sided plug connector which is individual for every vehicle-sided plug connector. As a result, the microcontroller of each high-voltage pump device is provided with an individual coding signal so that every electronic pump motor control unit is provided with an individual address within the bus system of the traction battery vehicle and is therefore individually controllable.

[0031] An embodiment of the invention is described with reference to the enclosed drawings, wherein figure 1 shows a schematic block diagram of an electronic pump motor control unit according to the invention for a high-voltage pump device of a traction battery vehicle, and figure 2 shows a schematic block diagram of a traction battery vehicle with several high-voltage pump devices comprising an electronic pump motor control unit according to the invention.

[0032] Figure 1 shows an electronic pump motor control unit 10 for a high-voltage pump device 100 of a traction battery vehicle 200. The electronic pump motor control unit 10 comprises a low-voltage domain LV which is a 12 V domain being electrically supplied by a 12 V DC vehicle battery 60 of the traction battery vehicle 200. The electronic pump motor control unit 10 of the high-voltage pump device 100 is electrically connected to the traction battery vehicle via a pump-sided plug connector 110 which comprises a low-voltage power supply pin 114, the pump-sided plug connector 110 being plugged to a vehicle-sided plug connector 210 with a low-voltage power supply pin 214 to electrically connect the low-voltage domain LV to the 12 V vehicle battery 60.

[0033] The electronic pump motor control unit 10 further comprises a high-voltage domain HV which is an 800 V domain being electrically supplied by an 800 V DC traction battery 50 of the traction battery vehicle 200. In particular, the 800 V traction battery 50 is connected to and electrically supplies the high-voltage electric pump drive motor 120 of the high-voltage pump device 100. The low-voltage domain LV and the high-voltage domain HV are galvanically isolated from each other to protect passengers and other persons from electric strokes of the high voltage of 800 V. Accordingly, no direct electrical connection between the low-voltage domain LV and the high-voltage domain HV is provided. Typically, the components of the electronic pump motor control unit 10 are arranged on a printed circuit board (not shown) wherein the low-voltage domain LV is galvanically isolated from the high-voltage domain HV by a moat-type isolation zone which physically separates the low-voltage components and their conducting paths from the high-voltage components and their conducting paths.

[0034] The electronic pump motor control unit 10 comprises a low-voltage microcontroller 20 being located within the high-voltage domain HV, the microcontroller 20 controlling the high-voltage electric pump drive motor 120 of the high-voltage pump device 100. The microcontroller 20 is electrically supplied by the power supply of the low-voltage domain LV, i.e. by the 12 V vehicle battery 60 of the traction battery vehicle 200. The electric energy for supplying the microcontroller 20 is transferred from the low-voltage domain LV to the high-voltage domain HV by a galvanically isolated energy transfer interface 30 which is defined by a flyback converter device 31. The galvanically isolated energy transfer interface 30 therefor comprises an inverter 25 within the low-voltage domain LV which converts the DC voltage from the battery 60 to an AC voltage. The flyback converter device 31 further comprises a transformer 32 with two primary windings 33,34, namely one input winding 33 within the low-voltage domain LV and one output winding 34 within the high-voltage domain HV. Additionally, the flyback converter 31 comprises a feedback circuit 36 with an additional auxiliary winding 38 at the transformer 32 for controlling the basic voltage level of the output voltage 35 of the galvanically isolated energy transfer interface 30 which is 18 V during the normal operation mode of the high- voltage pump device 100, i.e. if the traction battery vehicle 200 drives normally. The microcontroller 20 requires a DC input voltage so that the galvanically isolated energy transfer interface 30 comprises another inverter or a diode 28 to convert the output AC of the galvanically isolated energy transfer interface 30 to DC.

[0035] Furthermore, the electronic pump motor control unit 10 comprises a modulation device 40 at the low-voltage domain LV for modulating the voltage level of the output voltage 35 of the galvanically isolated energy transfer interface 30. The modulation device 40 comprises a resistor circuit 45 with four resistors 46,47,48,49 which are arranged such that a voltage divider is defined. Respectively, two resistors 46,49 and 47,48 are therefor arranged serially, wherein the resistors 46,47 and 48,49 are arranged in parallel. The resistor circuit 45 further comprises two switches 42,44, which can be any type of electrical switches. Both switches 42,44 are arranged serially with respect to the resistors 46,49. Each switch 42, 44 is connected to one coding pin 211, 212 of the vehicle-sided plug connector 210, wherein the coding pins 211, 212 provide an individual coding signal for the electronic pump motor control unit 10 of the high-voltage pump device 100 which assigns an individual address of the CAN-bus to the high-voltage pump device 100. Thereby, each high-voltage pump device 100 recognises the control signal assigned to it, so that the electronic pump motor control unit 10 listens to the correct individual control signals of the vehicle electronic control unit depending on the position and function of the high- voltage pump device 100 within the traction battery vehicle 200.

[0036] Each coding pin 211,212 is directly connected to one of the switches 42, 44 of the resistor circuit 45, so that the switches 42,44 are automatically switched by the coding signal of the coding pins 211,212. The coding signal is a 2-bit signal which can provide four different switching states of the resistor circuit 45 with four different total resistance values of the resistor circuit 45 by individually connecting / disconnecting three of the four resistors 46,47,48,49 using the switches 42,44, wherein one of the resistors 46,47,48,49 is permanently connected to the feedback circuit to define the basic constant output voltage of 18 V which is the optimal supply voltage of the microcontroller 20. The variation of the total resistance value of the resistor circuit 45 allows the modulation device 40 to thereby vary the voltage level of the input voltage of the input winding 33 of the transformer 32. Accordingly, the voltage level of the output voltage 35 of the output winding 34 of the transformer 32 is varied. The microcontroller 20, which is electrically supplied by the output voltage 35, is configured to measure and detect the output voltage 35 of the galvanically isolated energy transfer interface 30. In a start-up phase, i.e. if the traction battery vehicle 200 is started, the coding signal of the coding pins 211,212 defines the position of the switches 42,44 of the resistor circuit 45 and thereby defines the total resistance value of the resistor circuit 45 and, as a result, defines the input voltage of the input winding 33 of the transformer 32. The electrical energy is transferred from the input winding 33 to the output winding 34 and from there to the microcontroller 20. With the 2-bit signal, four different total resistance values can be defined within the resistor circuit 45, so that the output voltage 35 of the galvanically isolated energy transfer interface 30 can be set to 4 different values, for example, 16 V, 17 V, 18 V or 19 V.

[0037] The microcontroller 20 measures the incoming output voltage 35 and receives the coding information by the individual voltage value of the output voltage 35 to address the electronic pump motor control unit 10 within the CAN-bus system of the vehicle electronic control unit. Thereby, four identical high voltage pump devices 100, which are located in different positions within the traction battery vehicle 200, can be individually addressed by the CAN-bus system wherein every voltage value defines an individual can bus address.

[0038] Figure 2 shows a traction battery vehicle 200 with four identical high- voltage pump devices 100. For example, an output voltage 35 of 16 V is assigned to the first high-voltage pump device 10 for cooling the traction battery 50, wherein an output voltage 35 of 17 V is, for example, assigned to the second high-voltage pump device 10 for cooling one of the electric traction motors of the traction battery vehicle 200 etc. Thereby, four identically constructed and identically programmed high-voltage pump devices 10 can be used in different positions with different functions within the traction battery vehicle 200.

[0039] The electronic pump motor control unit 10, shown in figure 1, further comprises a separate galvanically isolated digital signal transfer interface 70 for transferring digital signals between the low-voltage domain LV and the high-voltage domain HV. The galvanically isolated digital signal transfer interface 70 is the double isolated digital signal transfer interface which comprises four transfer channels in total, wherein only one single transfer channel 72 is provided for transferring signals from the low-voltage domain LV to the high-voltage domain HV, which is already used for transferring another information from the low-voltage domain LV to the high-voltage domain HV, so that the coding signal cannot be transferred via the galvanically isolated digital signal transfer interface 70.

[0040] The other transfer channels of the galvanically isolated digital signal transfer interface 70 can only transfer signals from the high-voltage domain HV to the low-voltage domain LV. These channels are preferably used for transferring a sleep signal, a responding signal or a shutdown signal from the microcontroller 20 to the vehicle electronic control unit. The shutdown signal allows to deactivate the modulation device 40 in the normal operation mode of the vehicle by deactivating the coding signal. The resistor circuit 45 is therefor set to the normal operation state, for example, wherein both switches 42, 44 are opened. As a result, the voltage level of the input voltage and, correspondingly, the voltage level of the output voltage 35 is set to a constant basic voltage value of 18 V.

Claims

C L A I M S1. Electronic pump motor control unit (10) for a high-voltage pump device (100), in particular for a traction battery vehicle (200), with a low-voltage domain (LV) supplied by a low-voltage power supply (60), a high-voltage domain (HV) supplied by a high-voltage power supply (50) for driving the pump device (100), wherein the low-voltage domain (LV) and the high-voltage (HV) domain are galvanically isolated from each other, a low-voltage microcontroller (20) being located within the high- voltage domain (HV), a galvanically isolated energy transfer interface (30) for transferring low-voltage electrical energy from the low-voltage domain (LV) to the microcontroller (20), wherein the microcontroller (20) is electrically supplied by the output voltage (35) of the galvanically isolated energy transfer interface (30), and a modulation device (40) at the low-voltage domain (LV) for modulating the frequency and / or the voltage level of the output voltage (35), wherein the microcontroller (20) is configured to detect the modulation of the frequency and / or the voltage level of the output voltage (35).

2. Electronic pump motor control unit (10) for a high-voltage pump device (100) according to claim 1, wherein the modulation device (40) comprises a resistor circuit (45) with several ohmic resistors (46,47,48,49), the resistors (46,47,48,49) being individually switchable to define the voltage level of the output voltage (35).

3. Electronic pump motor control unit (10) for a high-voltage pump device (100) according to claim 2, wherein the resistor circuit (45) comprisestwo switches (42,44) for connecting / disconnecting the resistors (46,47,48,49).

4. Electronic pump motor control unit (10) for a high-voltage pump device (100) according to one of the preceding claims, wherein a separate galvanically isolated digital signal transfer interface (70) is provided for transferring digital signals between the low-voltage domain (LV) and the high-voltage domain (HV).

5. Electronic pump motor control unit (10) for a high-voltage pump device (100) according to claim 4, wherein the galvanically isolated digital signal transfer interface (70) is provided with one single transfer channel (72) for transferring signals from the low-voltage domain (LV) to the high-voltage domain (HV).

6. Electronic pump motor control unit (10) for a high-voltage pump device (100) according to one of the preceding claims, wherein the microcontroller (20) is configured to deactivate the modulation device (40).

7. Electronic pump motor control unit (10) for a high-voltage pump device (100) according to one of the preceding claims, wherein the galvanically isolated energy transfer interface (30) is defined by a flyback converter device (31).

8. Electronic pump motor control unit (10) for a high-voltage pump device (100) according to claim 7, wherein the flyback converter device (31) comprises a feedback circuit (36) within the low-voltage domain (LV).

9. Electronic pump motor control unit (10) for a high-voltage pump device (100) according to claim 8, wherein the resistor circuit (45) is part of the feedback circuit (36).

10. High-voltage pump device (100) with an electronic pump motor control unit (10) according to one of the preceding claims.

11. Traction battery vehicle (200) comprising at least one high-voltage pump device (100) with a pump-sided plug connector (110) and with an electronic pump motor control unit (10) according to one of the preceding claims, and a vehicle-sided plug connector (210) being connected to the pumpsided plug connector (110), wherein the vehicle-sided plug connector (210) comprises at least one, preferably two coding pins (211,212) which provide a coding signal for the modulation device (40), wherein the modulation device (40) modulates the frequency and / or the voltage level of the output voltage depending on the coding signal.

12. Traction battery vehicle (200) according to claim 11, comprising several high-voltage pump devices (100), each pump-sided plug connector (110) being connected to a separate vehicle-sided plug connector (210), wherein each vehicle-sided plug connector (210) provides an individual coding signal to the corresponding electronic pump motor control unit (10).

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