DE102017213194A1 - A converter device for converting a DC electrical voltage, method and control device for controlling a converter device for converting a DC electrical voltage - Google Patents

Abstract

A converter device (300) for converting a direct electrical voltage is presented. The converter device (300) has an input section (302) having an input terminal (310) for receiving an input electrical voltage, a first inductor (312), a switching device (314), a first capacitor (316), and a ground terminal (318). having. Also, the converter device (300) has an output portion (304) electrically connected to the input portion (302). The output section (304) includes a second inductor (320) having a primary winding (322) and a secondary winding (324) electrically isolated from the primary winding (322), a first rectifying element (332), a second capacitance (334), a first load terminal (336) for providing a first electrical output voltage to a first load (392), a second rectifying element (342), a third capacitance (344), and a second load terminal (346) for providing a second electrical output voltage to a second load (394) on. In this case, the first rectifying element (332), the second capacitance (334) and the first load terminal (336) are electrically connected to the primary winding (322) of the second inductance (320). The second rectifying element (342), the third capacitance (344) and the second load terminal (346) are electrically connected to the secondary winding (324) of the second inductance (320). The converter device (300) further comprises an electrical return line (350) from a tapping point (348) disposed between the first rectifying element (332), the second capacitance (334) and the first load terminal (336) to an interface (355) to a controller (360) for controlling the converter device (300).

Description

The present invention relates to a converter device for converting a direct electrical voltage, to a method for controlling a converter device for converting a direct electrical voltage and to a corresponding control device.

DC electrical voltages can be converted, for example, by means of a SEPIC converter (SEPIC = Single-Ended Primary Inductance Converter) of a galvanically isolated or separate SEPIC converter or comparable electrical circuits. In a galvanically isolated SEPIC converter opto-couplers or the like may be required for a required for control or feedback feedback or return.

Against this background, the present invention provides an improved DC electric power conversion apparatus, an improved method of controlling a DC electric power conversion apparatus, and an improved control apparatus according to the main claims. Advantageous embodiments will become apparent from the dependent claims and the description below.

According to embodiments, in particular, a converter device in the form of a galvanically isolated DC-DC converter, in particular a galvanically isolated SEPIC converter, controlled and / or regulated, wherein a return line can be designed as a continuous line connection. In this case, an output side of the converter device can be divided into parallel branches or circuit branches, a non-galvanically separated branch and at least one galvanically separated branch. A primary inductance or primary winding of an inductance of the DC-DC converter or transformer can thus be used for generating a non-galvanically isolated output voltage. By the common input side can be achieved that the duty cycles of the branches of the output side are identical. The output voltages can be coupled to each other via a common, switching element in the form of a switching device, in particular be fixedly coupled to each other.

Advantageously, according to embodiments in particular a simple, inexpensive and reliable control and / or regulation of an operation of a galvanically isolated DC-DC converter can be achieved. By a fixed connection of the galvanically isolated, second output voltage to the non-galvanically isolated, first output voltage, a control and / or regulation of the non-galvanically isolated, first output voltage may be sufficient. The control and / or regulation of the converter device can take place via a parallel non-galvanically isolated branch or first branch, the output of which can be returned in the form of the first output voltage. On a galvanically isolated feedback for control or regulation can thus be advantageously dispensed with. Thus, a design of the converter device can be simplified as compared with conventional galvanically separated SEPIC converters and, for example, size, number of components and cost can be reduced. The galvanically isolated, second output voltage can be generated in a simple manner. The non-galvanically isolated, first output voltage can be available without further switching elements and be used for loads that do not require isolation or galvanic isolation.

• • einen Eingangsabschnitt, der einen Eingangsanschluss zum Aufnehmen einer elektrischen Eingangsspannung, eine erste Induktivität, eine Schalteinrichtung, eine erste Kapazität und einen Masseanschluss aufweist;
• • einen Ausgangsabschnitt, der elektrisch mit dem Eingangsabschnitt verbunden ist, wobei der Ausgangsabschnitt eine zweite Induktivität mit einer Primärwicklung und einer von der Primärwicklung galvanisch getrennten Sekundärwicklung, ein erstes Gleichrichtelement, eine zweite Kapazität, einen ersten Lastanschluss zum Bereitstellen einer ersten elektrischen Ausgangsspannung für eine erste Last, ein zweites Gleichrichtelement, eine dritte Kapazität und einen zweiten Lastanschluss zum Bereitstellen einer zweiten elektrischen Ausgangsspannung für eine zweite Last aufweist, wobei das erste Gleichrichtelement, die zweite Kapazität und der erste Lastanschluss elektrisch mit der Primärwicklung der zweiten Induktivität verbunden sind, wobei das zweite Gleichrichtelement, die dritte Kapazität und der zweite Lastanschluss elektrisch mit der Sekundärwicklung der zweiten Induktivität verbunden sind; und
• • eine elektrische Rückführungsleitung von einem zwischen dem ersten Gleichrichtelement, der zweiten Kapazität und dem ersten Lastanschluss angeordneten Abgriffspunkt zu einer Schnittstelle zu einer Steuereinrichtung zum Steuern der Wandlervorrichtung.

A converter device for converting a direct electrical voltage has at least the following features:

• An input section having an input terminal for receiving an input electrical voltage, a first inductor, a switching device, a first capacitor, and a ground terminal;
• An output section electrically connected to the input section, the output section comprising a second inductor having a primary winding and a secondary winding electrically isolated from the primary winding, a first rectifying element, a second capacitance, a first load terminal for providing a first electrical output voltage for a first Load, a second rectifying element, a third capacitance and a second load terminal for providing a second electrical output voltage for a second load, wherein the first rectifying element, the second capacitance and the first load terminal are electrically connected to the primary winding of the second inductor, the second one Rectifying element, the third capacitor and the second load terminal are electrically connected to the secondary winding of the second inductance; and
• An electrical return line from a tapping point located between the first rectifying element, the second capacitance and the first load terminal to an interface to a control device for controlling the converter device.

The converter device is similar to a so-called SEPIC (Single-Ended Primary Inductance Converter) or galvanically isolated SEPIC. there For example, the converter device is designed to convert an electrical input voltage into at least two electrical output voltages. The converter device may also be referred to as a transformer. In other words, the converter device is designed to receive an electrical input voltage and to provide at least two electrical output voltages.

The first output voltage may correspond to the second output voltage with respect to a voltage value. Alternatively, the first output voltage and the second output voltage may differ from each other in terms of a voltage value.

An inductance may represent an electrical coil. The primary winding may represent a winding or other primary inductance. The secondary winding may represent a winding or other secondary inductance. A capacitor may represent a capacitor. The switching device may represent a transistor. The rectifying element may be poled in the forward direction to the first load terminal.

The output section may include a first branch and a second branch. Here, the first branch and the second branch may be electrically connected in parallel. The first branch may comprise at least the first rectifying element, the second capacitance and the first load terminal. The second branch may include at least the second rectifying element, the third capacitance, and the second load terminal.

The electrical return line may be configured to transmit the first output voltage as a feedback signal. The controlling may also include rules. The tapping point may be electrically connected between the first rectifying element, the second capacitance and the first load terminal.

According to one embodiment, the primary winding and the secondary winding of the second inductance may have a predefined winding ratio. In other words, a number of windings of the primary winding and a number of windings of the secondary winding may be in the predefined winding ratio. Such an embodiment offers the advantage that a ratio of the output voltages to one another can be set in a simple, exact and reliable manner via the winding ratio. With a winding ratio of one and an ideal rectifying element, in particular an ideal diode, identical values of the output voltages can be obtained.

The output section can also have at least one further winding of the second inductance, at least one further rectifying element, at least one further capacitance and at least one further load connection for providing at least one further electrical output voltage for at least one further load. In this case, the at least one further rectifying element, the at least one further capacitance and the at least one further load terminal can be electrically connected or connected to the at least one further winding. Such an embodiment offers the advantage that the number of galvanically isolated output branches can be increased or expanded in a simple and cost-effective manner.

Additionally or alternatively, the output section may have at least one additional inductance with a primary winding and a secondary winding electrically isolated from the primary winding, at least one additional rectifying element, at least one additional capacitance, and at least one additional load terminal for providing at least one additional electrical output voltage for at least one additional load. In this case, the at least one additional rectifying element, the at least one additional capacitance and the at least one additional load terminal can be electrically connected or connected to the secondary winding at least one additional inductance. Such an embodiment offers the advantage that the number of galvanically isolated output branches can be increased or expanded in a simple and cost-effective manner.

Further, the converter device may include an embodiment of a control device mentioned below. In this case, the control device can be connectable or connected to the interface with signal transmission capability. The control device may be designed to control the converter device or an operation of the converter device. Such an embodiment offers the advantage that an inexpensive and safe control of the converter device can be achieved.

In addition, the converter device may have a drive line. By means of the control line, the switching device can be connectable or connected to the control device signal transmitting capability. Such an embodiment has the advantage that a simple and cost-effective control of the switching device and thus control of the converter device can be realized.

The converter device can also have a supply device for providing the electrical input voltage. In this case, the provision device can be electrically connected to the Input terminal connectable or connected. The providing device may represent a voltage source, DC voltage source or the like. Such an embodiment offers the advantage that a secure and / or integrated voltage supply can be provided.

• • Einlesen der ersten elektrischen Ausgangsspannung von der Rückführungsleitung;
• • Erzeugen eines Steuersignals zum Steuern der Wandlervorrichtung unter Verwendung der ersten elektrischen Ausgangsspannung; und
• • Ausgeben des Steuersignals an die Schalteinrichtung.

A method for controlling a converter device for converting a direct electrical voltage, wherein the method is executable in connection with an embodiment of the aforementioned converter device, comprises at least the following steps:

• • reading the first electrical output voltage from the return line;
• Generating a control signal for controlling the converter device using the first electrical output voltage; and
• Outputting the control signal to the switching device.

The method of controlling is executable to control an embodiment of the aforementioned converter device. In this case, the method for controlling is executable using a control device which corresponds to or resembles the control device described below. The converter device may comprise the control device.

Also advantageous is a control device that is set up to execute steps of an embodiment of the above-mentioned method in corresponding units and additionally or alternatively to control them.

A control device may be an electrical device that processes electrical signals, for example sensor signals, and outputs control signals in dependence thereon. The control device may have one or more suitable interfaces, which may be formed in hardware and / or software. For example, in a hardware configuration, the interfaces may be part of an integrated circuit in which functions of the device are implemented. The interfaces may also be their own integrated circuits or at least partially consist of discrete components. In a software training, the interfaces may be software modules that are present, for example, on a microcontroller in addition to other software modules.

A computer program product with program code which can be stored on a machine-readable carrier such as a semiconductor memory, a hard disk memory or an optical memory and is used to carry out the method according to one of the embodiments described above if the program is run on a computer or a control device is also of advantage is performed.

• 1 eine schematische Darstellung eines Gleichspannungswandlers;
• 2 eine schematische Darstellung eines galvanisch getrennten Gleichspannungswandlers;
• 3 eine schematische Darstellung einer Wandlervorrichtung gemäß einem Ausführungsbeispiel;
• 4 ein Ablaufdiagramm eines Verfahrens zum Steuern gemäß einem Ausführungsbeispiel; und
• 5 eine schematische Darstellung einer Steuereinrichtung gemäß einem Ausführungsbeispiel.

The invention will be described by way of example with reference to the accompanying drawings. Show it:

• 1 a schematic representation of a DC-DC converter;
• 2 a schematic representation of a galvanically isolated DC-DC converter;
• 3 a schematic representation of a converter device according to an embodiment;
• 4 a flowchart of a method for controlling according to an embodiment; and
• 5 a schematic representation of a control device according to an embodiment.

In the following description of preferred embodiments of the present invention, the same or similar reference numerals are used for the elements shown in the various figures and similarly acting, wherein a repeated description of these elements is omitted.

1 shows a schematic representation of a DC-DC converter 100 , In the DC-DC converter 100 is a so-called Single-Ended Primary Inductance Converter (SEPIC). In the presentation of 1 are from the DC-DC converter 100 this is a voltage source 102 (V_IN), a first inactivity 104 (L1), a switch 106 (S1), a ground connection 108 (0), a capacitor 110 (C1), a second inductance 112 (L2), a diode 114 (D1), an output capacitor 116 (C_OUT), a return line 118 and a logic device 120 shown. Furthermore, one is to the DC-DC converter 100 connected load 130 (R_load).

In the DC-DC converter 100 For example, an output voltage may be both smaller and larger than an input voltage but has the same polarity. Is the switch 106 (S1) closed, will be in both inductances 104 (L1) and 112 (L2) power is fed. The diode 114 (D1) locks and there is no energy to the load 130 (R_Last). Weight 130 (R_Last) is from the output capacitor 116 (C_OUT) fed. In steady state operation is the capacitor 110 (C1) charged to the input voltage. When the clock is switched off, electrical current builds up in the two inductors 104 (L1) and 112 (L2) slowly. This is the diode 114 (D1) conductive and there is a current flow in the output capacitor 116 (C_OUT) and through the load 130 (R_Last). Thus the current through the first inactivity 104 (L1) can continue to flow, should be a voltage at the switch 106 (S1) rise to U _IN + U _OUT + U _F. The first inactivity 104 (L1) provides a voltage swing, which reloads the capacitor 110 (C1) and a formation of the output voltage allows. The output current consists of the current flow through the second inductance 112 (L2) and that by the first inactivity 104 (L1) and the capacitor 110 (C1) together. There is energy from the input side to the output side, including the second inductance, in both the on-clock and off-clock 112 (L2). Due to the capacitor 110 (C1) no DC currents can flow between input and output. The SEPIC converter or DC-DC converter 100 has a real shutdown capability. When the switch 106 (S1) remains permanently closed, sets an output voltage of 0 V. The duty cycle d is calculated as: $$d=\frac{1}{\frac{U_{IN}}{U_{OUT}+U_F}+1}$$

The SEPIC converter or DC-DC converter 100 can be operated in a continuous operation and in a discontinuous operation. In continuous operation, the currents reach through the inductors 104 (L1) and 112 (L2) never or at least almost never zero value. In discontinuous operation, the currents are reduced to 0 A, resulting in a third, periodically occurring section.

2 shows a schematic representation of a galvanically isolated DC-DC converter 200 , The DC-DC converter 200 in 2 corresponds to the DC-DC converter 1 with the exception that the same as a galvanically isolated DC-DC converter 200 with an isolation limit 240 is executed, the second inductance in the form of a primary winding 212A (L_Pri) and a galvanically isolated secondary winding 212B (L_Sek) is executed and a galvanically isolated return line 218 is provided.

mit den Übersetzungsverhältnis $\text{ü}=\frac{{\text{N}}_2}{{\text{N}}_1}.$

Eine Regelung der Ausgangsspannung erfolgt über die Rückführungsleitung 218, welche die Isolationsgrenze 240 überschreitet und somit z. B. mittels eines Optokopplers oder dergleichen galvanisch getrennt auszuführen ist.In the galvanically isolated SEPIC converter or DC-DC converter 200 the second inductor has the primary winding 212A (L_Pri) on a core and a coupled secondary inductance or secondary winding 212B (L_Sek), which is galvanically isolated from the input circuit. At the secondary winding 212B (L_sec) is followed by an output circuit with diode 114 (D1), output capacitor 116 (C_OUT) and load 130 (R_Last). Since a flow of energy into the output circuit takes place in a SEPIC converter both in the on-off and in the off-clock, the core serves as energy storage and as a direct energy transfer. SEPIC converters such as the galvanically isolated DC-DC converter 200 thus represent a separate group within the galvanically isolated DC / DC converter and can be assigned neither the flyback converters nor the flow transducers. Compared to flow rate converters, a smaller number of components and only a necessary switch can result in mass. In addition, requirements for the transformer core can be lower than for flyback converters, since with the same output power less energy is stored in the core. The duty cycle d is calculated to $$d=\frac{1}{\text{ü}·\left(\frac{U_{IN}}{U_{OUT}+U_F}\right)+1}$$

with the gear ratio $\text{ü}=\frac{{\text{N}}_2}{{\text{N}}_1},$

A regulation of the output voltage via the return line 218 which is the isolation limit 240 exceeds and thus z. B. by means of an optocoupler or the like galvanically separated run.

For a control or regulation of galvanically isolated systems, for example, concepts are usually provided, which increase a number of components, a size and cost of the system or an electrical circuit. For example, optocouplers for galvanic isolation in guide lines are required. As will be explained below with reference to the figures described below, a galvanically isolated SEPIC converter can be realized which, without galvanically isolated feedback, i. H. For example, by means of continuous return line, can be controlled or regulated.

3 shows a schematic representation of a converter device 300 according to an embodiment. The converter device 300 is designed to convert a DC electrical voltage. Thus, the converter device 300 executed as a DC-DC converter. The converter device 300 has a similarity to a SEPIC converter and a galvanically isolated SEPIC converter.

The converter device 300 has an entrance section 302 , an exit section 304 , an input terminal 310 , a first inductance 312 (L1), a switching device 314 (S1), a first capacity 316 (C1) or a capacity, a ground connection 318 (0), a second inductance 320 , a primary winding 322 (L_Pri), a secondary winding 324 (L_Sek), a first rectifying element 332 (D1), a second capacity 334 (C_OUT1) or first output capacitance, a first load connection 336 , a second rectifying element 342 (D2), a third capacity 344 (C_OUT2) or second output capacitance, a second load connection 346 , a tapping point 348 , an electrical return line 350 and an interface 355 on.

The converter device 300 indicates the entrance section 302 , the exit section 304 and the electrical return line 350 on. The entrance section 302 and the output section are electrically connected together. In addition, in the presentation of 3 a first load 392 (R_Last1) and a second load 394 (R_Last2) shown which electrical to the converter device 300 are connected.

In this case, the input section 302 at least the input connection 310 , the first inductance 312 (L1), the switching device 314 (S1), the first capacity 316 (C1) and the ground connection 318 (0) on. At the input port 310 An electrical input voltage (V_IN) can be received. The first inductance 312 (L1) is designed, for example, as an electrical coil. The switching device 314 (S1) is implemented, for example, as a transistor. The first capacity 316 (C1) is implemented, for example, as a capacitor. Furthermore, the entrance section 302 also the interface 355 to a controller for controlling the converter device 300 on. At the interface 355 is a first end of the electrical return line 350 connected.

The exit section 304 has at least the second inductance 320 , the primary winding 322 (L_Pri), the secondary winding 324 (L_Sek), the first rectification element 332 (D1), the second capacity 334 (C_OUT1), the first load port 336 , the second rectifying element 342 (D2), the third capacity 344 (C_OUT2) and the second load port 346 on. The second inductance 320 is designed, for example, as an electrical coil. The first rectifying element 332 (D1) and the second rectifying element 342 (D2) are designed for example as diodes. The second capacity 334 (C_OUT1) and the third capacity 344 (C_OUT2) are designed, for example, as capacitors. At the first load connection 336 is a first electrical output voltage for the first load 392 (R_Last1) available. The first load 392 (R_Last1) is electrically connected to the first load terminal 336 connected. At the second load connection 346 is a second electrical output voltage for the second load 394 (R_Last2) available. The second load 394 (R_Last2) is electrically connected to the second load terminal 346 connected.

The exit section 304 also has the tapping point 348 on. The tapping point 348 is between the first rectifying element 332 (D1), the second capacity 334 (C_OUT1) and the first load port 336 arranged. In other words, the tapping point 348 electrically between the first rectifying element 332 (D1), the second capacity 334 (C_OUT1) and the first load port 336 connected. At the tapping point 348 is a second end of the electrical return line 350 connected.

The second inductance 320 indicates the primary winding 322 (L_Pri) and the secondary winding 324 (L_sec). Here are the primary winding 322 (L_Pri) and the secondary winding 324 (L_Sek) galvanically separated. Further, the primary winding 322 (L_Pri) and the secondary winding 324 (L_Sek) coupled together.

With the primary winding 322 (L_Pri) are the first rectifying element 332 (D1), the second capacity 334 (C_OUT1) and the first load connection 336 electrically connected. Thus, the primary winding represent 322 (L_Pri), the second capacity 334 (C_OUT1) and the first load connection 336 a first branch or circuit branch of the output section 304 ,

With the secondary winding 324 (L_sec) are the second rectifying element 342 (D2), the third capacity 344 (C_OUT2) and the second load port 346 electrically connected. Thus represent the secondary winding 324 (L_sec), the second rectification element 342 (D2), the third capacity 344 (C_OUT2) and the second load port 346 a second branch or circuit branch of the output section 304 ,

According to the in 3 illustrated embodiment, the converter device 300 Furthermore, a control device 360 on. The control device is designed to be the converter device 300 to control or an operation of the converter device 300 to control. Taxes can also be understood in this context as rules. The control device 360 is with the interface 355 coupled. By way of example only, the controller is 360 in the entrance section 302 arranged. Furthermore, the converter device 300 a control line 365 on. By means of the control line 365 are the switching device 314 (S1) and the control device 360 signal transmission capable connected to each other.

Furthermore, the converter device 300 according to the in 3 illustrated embodiment, a provision device 370 for providing the input electrical voltage (V_IN). The Providing device 370 is electrically connected to the input terminal.

Ein Verhältnis der Ausgangsspannungen zueinander ist über das Wicklungsverhältnis der Primärwicklung 322 (L_Pri) und der Sekundärwicklung 324 (L_Sek) einstellbar. Bei einem Wicklungsverhältnis von 1 und einer idealen Diode können beispielsweise identische Ausgangsspannungswerte erhalten werden.According to one embodiment, the primary winding 322 (L_Pri) and the secondary winding 324 (L_sec) of the second inductance 320 a predefined winding ratio. Substituting the duty cycles of the first circuit branch and the second circuit branch of the output section 304 the same, the following relationship arises: $$U_{OUT2}=\text{ü}·U_{OUT1}+U_F·\left(\text{ü}-1\right)$$

A ratio of the output voltages to each other is about the winding ratio of the primary winding 322 (L_Pri) and the secondary winding 324 (L_Sek) adjustable. For example, with a winding ratio of 1 and an ideal diode, identical output voltage values can be obtained.

Due to the fixed connection of the galvanically isolated output voltage or second output voltage at the second load connection 346 to the first output voltage at the first load terminal 336 is a control of the first output voltage at the first load terminal 336 sufficient. The regulation of the second output voltage at the second load terminal 346 takes place via the parallel first circuit branch whose output in the form of the first output voltage from the point of application 348 via the return line 350 is returned. A transistor as a switching device 314 (S1) is also easy to control, since it is grounded on one side or on the ground connection 318 (0) is connected.

According to one embodiment, the output section 304 at least one further winding of the second inductance 320 at least one further rectifying element, at least one further capacitance and at least one further load connection for providing at least one further electrical output voltage for at least one further load. Alternatively, the output section 304 at least one additional inductance having a primary winding and a secondary winding electrically isolated from the primary winding, at least one additional rectifying element, at least one additional capacitance and at least one additional load terminal for providing at least one additional electrical output voltage for at least one additional load. A number of galvanically isolated output branches can thus be extended. For example, six galvanically insulated output branches for driver supply to an inverter and one use of the non-galvanically isolated branch for a sensor for rotor position determination of an electrical machine or the like are possible.

4 shows a flowchart of a method 400 for controlling according to an embodiment. The procedure 400 is executable to control a converter device for converting a DC electrical voltage. The procedure 400 for controlling is executable using a control device which controls the device 3 corresponds or resembles. Further, the method 400 for controlling in connection with the converter device 3 or a similar converter device executable.

In one step 410 the reading is in the process 400 to read in the first electrical output voltage from the return line for controlling. The following will be in one step 420 generating using the first electrical output voltage generates a control signal for controlling the converter device. Finally, in one step 430 outputting the control signal to the switching device.

5 shows a schematic representation of a control device 360 according to an embodiment. The control device 360 corresponds or resembles the controller 3 , The control device 360 is configured to control a transducer device which is the transducer device 3 corresponds or resembles.

Furthermore, the control device 360 trained to do the procedure 4 or perform a similar procedure.

The control device 360 is electrically connected between the electrical return line 350 and the control line 365 connected. Here are the return line 350 and the controller 360 by means of the interface 355 signal transmission capable connected to each other. The control line 365 is electrically or signal transmitting at the control device 360 connected.

The control device 360 has a read-in device 510 , a generating device 520 and an output device 530 on. The reading device 510 is configured to the first electrical output voltage of the converter device from the return line 350 read. More specifically, the read-in device 510 designed to be the first electrical output voltage across the interface 355 from the return line 350 read. The generating device 520 is configured to generate a control signal using the first electrical output voltage 535 to generate for controlling the converter device. The output device 530 is designed to be the control signal 535 output to the switching device of the converter device. More specifically, the output device 530 trained to control the signal 535 via the control line 365 output to the switching device.

The embodiments described and shown in the figures are chosen only by way of example. Different embodiments may be combined together or in relation to individual features. Also, an embodiment can be supplemented by features of another embodiment.

Furthermore, method steps according to the invention can be repeated as well as carried out in a sequence other than that described.

If an exemplary embodiment comprises a "and / or" link between a first feature and a second feature, this can be read so that the embodiment according to one embodiment, both the first feature and the second feature and according to another embodiment, either only the first Feature or only the second feature.

LIST OF REFERENCE NUMBERS

100

DC converter

102

Voltage source (V_IN)

104

first inactivity (L1)

106

Switch (S1)

108

Ground connection (0)

110

Capacitor (C1)

112

second inductance (L2)

114

Diode (D1)

116

Output capacitor (C_OUT)

118

Return line

120

Logic device

130

load

200

galvanically isolated DC-DC converter

240

isolation boundary

212A

Primary winding (L_Pri)

212B

Secondary winding (L_sec)

218

Return line

300

converter device

302

input section

304

output section

310

input port

312

first inductance (L1)

314

Switching device (S1)

316

first capacity (C1)

318

Ground connection (0)

320

second inductance

322

Primary winding (L_Pri)

324

Secondary winding (L_sec)

332

first rectifying element (D1)

334

second capacity (C_OUT1)

336

first load connection

342

second rectifying element (D2)

344

third capacity (C_OUT2)

346

second load connection

348

tapping

350

electrical return line

355

interface

360

control device

365

drive line

370

Providing device

392

first load (R_Last1)

394

second load (R_Last2)

400

Method of controlling

410

Step of reading in

420

Step of creating

430

Step of spending

510

read-in

520

generator

530

output device

535

control signal

Claims (9)

A converter device (300) for converting a DC electrical voltage, characterized in that the converter device (300) has at least the following features: an input section (302) having an input terminal (310) for receiving an electrical input voltage, a first inductance (312), a switching device (314), a first capacitor (316) and a ground terminal (318); An output section (304) electrically connected to the input section (302), wherein the output section (304) has a second inductance (320) with a primary winding (322) and a secondary winding (324) which is galvanically isolated from the primary winding (322), a first rectifying element (332), a second capacitance (334), a first load terminal (334). 336) for providing a first electrical output voltage to a first load (392), a second rectifying element (342), a third capacitance (344), and a second load terminal (346) for providing a second electrical output voltage to a second load (394) Wherein the first rectifying element (332), the second capacitance (334) and the first load terminal (336) are electrically connected to the primary winding (322) of the second inductance (320), wherein the second rectifying element (342), the third Capacitance (344) and the second load terminal (346) are electrically connected to the secondary winding (324) of the second inductance (320); and • an electrical return line (350) from a tapping point (348) located between the first rectifying element (332), the second capacitance (334) and the first load terminal (336) to an interface (355) to a controller (360) for controlling the converter device (300). Converter device (300) according to Claim 1 , characterized in that the primary winding (322) and the secondary winding (324) of the second inductance (320) have a predefined winding ratio. Converter device (300) according to one of the preceding claims, characterized in that the output section (304) at least one further winding of the second inductance (320), at least one further rectifying element, at least one further capacitance and at least one further load terminal for providing at least one further electrical Output voltage for at least one additional load. Converter device (300) according to one of the preceding claims, characterized in that the output section (304) has at least one additional inductance with a primary winding and a secondary winding electrically isolated from the primary winding, at least one additional rectifying element, at least one additional capacitance and at least one additional load connection to Providing at least one additional electrical output voltage for at least one additional load. Converter device (300) according to one of the preceding claims, characterized by a control device (360) according to Claim 9 in which the control device (360) can be connected or connected to the interface (355) in a signal-transmitting manner. Converter device (300) according to Claim 5 , characterized by a control line (365), wherein by means of the control line (365), the switching device (314) with the control device (360) signal connectable connectable or connected. A converter device (300) according to any one of the preceding claims, characterized by providing means (370) for providing said electrical input voltage, said providing means (370) being electrically connectable or connected to said input terminal (310). Method (400) for controlling a converter device (300) for converting a direct electrical voltage, the method (400) being feasible in conjunction with a converter device (300) according to one of the preceding claims, characterized in that the method (400) has at least the following Comprising: • reading (410) the first electrical output voltage from the return line (350); Generating (420) a control signal (535) for controlling the converter device (300) using the first electrical output voltage; and • outputting (430) the control signal (535) to the switching means (314). Control means (360) arranged to perform steps of the method (400) according to Claim 8 in corresponding units (510, 520, 530) execute and / or to control.

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