EP4256684A1 - Dispositif de commande pour convertisseur continu-continu, convertisseur continu-continu et procédé d'actionnement d'un convertisseur continu-continu - Google Patents

Dispositif de commande pour convertisseur continu-continu, convertisseur continu-continu et procédé d'actionnement d'un convertisseur continu-continu

Info

Publication number
EP4256684A1
EP4256684A1 EP21787433.8A EP21787433A EP4256684A1 EP 4256684 A1 EP4256684 A1 EP 4256684A1 EP 21787433 A EP21787433 A EP 21787433A EP 4256684 A1 EP4256684 A1 EP 4256684A1
Authority
EP
European Patent Office
Prior art keywords
converter
current
voltage
output
ratio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21787433.8A
Other languages
German (de)
English (en)
Inventor
Gholamabas Esteghlal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP4256684A1 publication Critical patent/EP4256684A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/34—Snubber circuits
    • H02M1/342—Active non-dissipative snubbers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • Control device for a DC-DC converter DC-DC converter device and method for controlling a DC-DC converter
  • the present invention relates to a control device for a DC-DC converter and a DC-DC converter device with such a control device.
  • the present invention also relates to a method for driving a DC-DC converter.
  • DC-DC converters are used in numerous areas of application.
  • DC converters can be used to transfer electrical energy from a high-voltage network of an electric vehicle to a low-voltage network of the vehicle.
  • Such DC-DC converters can, for example, comprise a control circuit which controls the DC-DC converter using one or more specified setpoint values and measured values recorded by sensors. The reliability of the measured values recorded by sensors is of essential importance here.
  • flyback converters or also fly-back converters can be used as DC voltage converters.
  • the publication DE 195 07 084 A1 discloses, for example, a flyback converter designed as a switching controller.
  • the present invention creates a control device for a DC-DC converter, a DC-DC converter device and a method for controlling a DC-DC converter with the features of the independent patent claims. Further advantageous embodiments are the subject matter of the dependent patent claims.
  • a control device for a DC-DC converter serves to convert an input DC voltage into an output DC voltage.
  • the control device is designed to calculate a first ratio between an input current and an output current of the DC/DC converter.
  • the first ratio between the input current and the output current can be calculated in particular using a duty cycle used for driving the DC-DC converter.
  • the control device is also designed to calculate a second ratio between the input current and the output current of the DC/DC converter.
  • the second ratio between the input current and the output current can be calculated in particular using an input voltage and an output voltage of the DC/DC converter.
  • the control device is designed to detect a malfunction.
  • the malfunction can in particular be a malfunction of a voltage and/or current sensor which provides sensor values for the actuation of the DC-DC converter.
  • the malfunction can be detected in particular if the calculated first ratio between the input current and the output current and the calculated second ratio between the input current and the output current deviate from one another.
  • a malfunction can be detected if the two ratios between the input current and the output current deviate from one another by more than a predetermined threshold value.
  • a DC-DC converter device with a DC-DC converter and a control device according to the invention for the DC-DC converter is designed to convert an input DC voltage into a predetermined output DC voltage.
  • the control device is designed in particular to determine a duty cycle for driving the DC-DC converter and to drive the DC-DC converter using the determined duty cycle.
  • the DC-DC converter can be controlled, for example, with a pulse-width modulated control with a predetermined duty cycle.
  • a method of driving a DC-DC converter The DC-DC converter for this method is designed to convert a DC input voltage into a DC output voltage.
  • the method includes a step of calculating a first ratio between an input current and an output current of the DC/DC converter.
  • the first ratio between the input current and the output current can be calculated in particular using a duty cycle used for driving the DC-DC converter.
  • the method further includes a step of calculating a second ratio between the input current and the output current of the DC/DC converter.
  • the second ratio between the input current and the output current can be calculated in particular using an input voltage and an output voltage of the DC/DC converter.
  • the method includes a step for detecting a malfunction.
  • a malfunction can be detected if the calculated first ratio between the input current and the output current and the calculated second ratio between the input current and the output current of the DC-DC converter deviate from one another.
  • a malfunction can be detected in particular when the two ratios between the input current and the output current deviate from one another by more than a predetermined desired value.
  • the present invention is based on the finding that for the operation of a DC-DC converter and in particular for safe or reliable regulation of the output parameters of a DC-DC converter, the operating parameters such as the electrical voltages at the input and/or output of the DC-DC converter must be reliably known.
  • the relevant measured values can be recorded and verified using a plurality of redundant sensors, if necessary.
  • such a redundant design of the system is associated with greater effort and higher costs.
  • the present invention provides for determining the relationships between the parameters required for controlling the DC-DC converter using two different calculation methods. Since in some cases different operating parameters are included for the two different calculation methods, discrepancies in the sensor values can be recognized very easily. If the different calculation methods lead to a discrepancy, this indicates a malfunction, for example of a sensor relevant to the regulation of the DC-DC converter. The reliability of the sensors used can thus also be verified without having to use complex and cost-intensive redundant sensor systems for this purpose.
  • any suitable DC converter can be used as a DC converter for such a system.
  • any direct voltage converter can be used, which is regulated on the basis of a pulse duty factor of a pulse width modulated control.
  • the DC voltage converter can be what is known as a flyback converter or flyback converter.
  • the DC voltage converter can be a unidirectional DC voltage converter that can convert an electrical DC voltage into a further electrical DC voltage in only one direction.
  • basically bidirectional DC voltage converters are also possible, which can convert an electrical DC voltage between two different voltage levels in both directions.
  • a ratio between an input current and an output current is formed to check the current and voltage values for plausibility.
  • any other relationships can also be formed for plausibility checks.
  • the control device is designed to alternatively control the DC-DC converter either in a discontinuous operating mode (discontinuous conduction mode, DCM) or in a non-discontinuous operating mode (continuous conduction mode, CCM).
  • the control device can be designed to calculate the ratio between the input current and the output current, taking into account the respective current control mode for the DC-DC converter.
  • DCM discontinuous conduction mode
  • CCM continuous conduction mode
  • the control device can be designed to calculate the ratio between the input current and the output current, taking into account the respective current control mode for the DC-DC converter.
  • different mathematical relationships result depending on the operating mode. Accordingly, by considering the operating mode of the DC-DC converter, the appropriate calculation scheme can be selected and used.
  • the control device is designed to regulate the pulse duty factor for driving the DC-DC converter using a predetermined target value for the output voltage and/or a predetermined target value for the output current.
  • a control loop can be implemented in the control device for the DC-DC converter, which regulates the respective duty cycle for the control of the DC-DC converter using a predetermined setpoint based on a sensor value for the output voltage or the output current.
  • a pulse duty factor for driving the DC-DC converter can be determined in order to set the desired setpoint values at the output of the DC-DC converter.
  • the control device is designed to output a signal if a malfunction has been detected.
  • This signaling can be an electronic signal, for example, which can be output to one or more other components.
  • a malfunction can be signaled to a higher-level control authority in this way.
  • an optical or acoustic signal can also be output, for example, in order to indicate the malfunction to a user.
  • the DC-DC converter can include a flyback converter. Flyback converters are also known by the term "flyback converters".
  • any other suitable DC voltage converter is of course also possible.
  • the DC-DC converter can be a DC-DC converter which can be regulated on the basis of a pulse width modulated signal.
  • the DC-DC converter can include a first current sensor, which is designed to detect an input current of the DC-DC converter.
  • the DC-DC converter can also include a first voltage sensor configured to detect an input voltage of the DC-DC converter.
  • the DC-DC converter can include a second current sensor, which is designed to detect an output current of the DC-DC converter.
  • the DC-DC converter can also include a second voltage sensor, which is designed to detect an output voltage of the DC-DC converter.
  • the control device can be designed to check at least one of the sensor values using the first ratio between input current and output voltage.
  • the currently used duty cycle for controlling the DC-DC converter is included in the calculation of the first ratio between input current and output current, and this duty cycle is determined, for example, on the basis of a control loop, it can be checked whether the duty cycle of the control loop corresponds to that provided by the sensors Values and thus also in accordance with the second ratio between input voltage and output voltage.
  • Fig. 1 a schematic representation of a block diagram of a
  • Fig. 2 a schematic representation of a basic circuit diagram of a
  • Fig. 3 a flowchart of how a method for controlling a
  • DC-DC converter is based according to one embodiment.
  • FIG. 1 shows a schematic representation of a DC voltage converter arrangement 1 according to an embodiment.
  • the DC-DC converter arrangement 1 includes a DC-DC converter 10 which can be controlled by a control device 20 by means of control signals.
  • An input DC voltage UJn can be provided at the input of the DC voltage converter 10, for example. If electrical energy is transferred from the input side of DC-DC converter 10 to an output side, an electrical current I Jn flows into DC-DC converter 10.
  • DC-DC converter 10 converts the electrical DC voltage UJn provided at the input into an electrical output DC voltage with electrical voltage U_out. If electrical energy is transmitted from the input side to the output side of the DC-DC converter 10, then an electric current I_out flows out of the DC-DC converter 10 on the output side.
  • a current sensor 12 can be provided for detecting the input current I Jn in the DC-DC converter 10 .
  • the input voltage UJn can, for example, by means of a suitable voltage sensor 11 are monitored.
  • the output current I_out from the DC-DC converter 10 can be detected using a suitable current sensor 14 and the output voltage U_out can be monitored using a corresponding voltage sensor 13 .
  • the sensor values recorded by the sensors 11 to 14 can be made available to a control device 20 .
  • the control device 20 can then control the DC-DC converter 10 using the detected sensor values in such a way that, for example, a predetermined target voltage is provided at the output of the DC-DC converter 10 .
  • the output current I_out can also be set to a specified target value.
  • one or more target values S can be provided at the control device 20 .
  • the output of the DC-DC converter 10 can be set to the predetermined desired value(s) by adjusting a duty cycle in the case of a pulse-width-modulated control of the DC-DC converter 10 .
  • a control loop can be provided in the control device 20, which determines a corresponding pulse duty factor D using the specified setpoint value S and one or more sensor values from the voltage and/or current sensors 11 to 14.
  • the sensor values may have to be at least partially checked for plausibility.
  • control device can, for example, use a number of different methods to calculate relationships between input variables and output variables. If the different calculation methods are based on different variables and the different methods lead to the same or at least approximately the same values, then the sensor values on which they are based can be regarded as plausible. On the other hand, when calculating using If a significant deviation, for example a deviation by more than a predetermined threshold value, is determined using different calculation methods, this can indicate an error within the control loop or in at least one of the voltage or current sensors 11 to 14 .
  • the function of the DC-DC converter 10 can be restricted or the DC-DC converter can be completely deactivated if necessary.
  • a relationship, for example a quotient, between the input current I Jn and the output current l_out can be calculated in a first step, with this ratio being calculated in the first step using the currently set duty cycle D for driving the DC-DC converter 10 is calculated.
  • the relationships between the pulse duty factor D and the other sensor values to be applied here can depend on the individual structure of the DC-DC converter 10 and the currently set operating mode of the DC-DC converter 10 . Specific examples of such a calculation are detailed further below.
  • the ratio between the input current I Jn and the output current I_out can also be calculated using the current input voltage UJn and the current output voltage U_out.
  • the current and voltage values of the corresponding current and voltage sensors 11 to 14 can be used for this purpose, for example.
  • the control device 20 can, for example, on the one hand calculate the ratio of the input current I Jn and the output current l_out, taking into account the currently set pulse duty factor D, and on the other hand calculate the ratio of the input current I Jn and the output current l_out on the basis of the input voltage U Jn and the output voltage U_out.
  • this second ratio is calculated without taking into account the currently set duty cycle in DC-DC converter 10. If the two ratios of input current I Jn and output current l_out are the same or at least approximately the same, this can be taken as an indication of correct sensor values. If, on the other hand, the two ratios of input current I Jn and output current I_out deviate significantly, i.e. by more than a predetermined threshold value, a malfunction of DC-DC converter 10 or at least one of current or voltage sensors 11 to 14 can be concluded.
  • FIG. 2 shows a schematic representation of a basic circuit diagram of a flyback converter, as can be used, for example, as a DC-DC converter 10 in the DC-DC converter arrangement 1 according to one embodiment.
  • the DC-DC converter 10 in this exemplary embodiment comprises a transformer Tr.
  • This transformer can, for example, have a number of turns N_p on the primary side and a number of turns N_s on the secondary side.
  • the leakage inductance of this transformer Tr is represented by the additional inductance Ls.
  • the primary side of the transformer Tr is connected to the input terminals of the DC/DC converter 10 in series with a first switching element TI.
  • a second switching element T2 is arranged in series with a first capacitor CI in parallel with the primary-side terminals of the transformer Tr.
  • the secondary side of the transformer Tr is connected to the output terminals of the DC/DC converter 10 in series with a third switching element T3.
  • a second capacitor C2 is provided in parallel.
  • L stands for the main inductance of the flyback converter
  • f for the switching frequency at which the flyback converter is operated
  • R for the ohmic losses of the flyback converter
  • a current ratio between the input current IJn and the output current I_out can be calculated from the duty cycle D and the other known properties of the flyback converter. This ratio can be compared to the ratio of the input current IJn and output current I_out already described above based on the corresponding input voltage UJn and output voltage U_out, which has been calculated without using the duty cycle D.
  • DC-DC converter arrangements taking into account the respective properties of the control parameters, in particular a duty cycle for a pulse-width modulated control, analogous relationships are formed in order to compare the ratio between the input current and the output current on the one hand based on the corresponding voltages and on the other hand on the basis of the control parameters set in each case. Due to the plausibility check of the sensor values, a redundant design of the individual sensors can be dispensed with.
  • FIG. 3 shows a flow chart on how a method for controlling a DC-DC converter according to one embodiment is based.
  • the method can include any steps as have already been described above in connection with the DC-DC converter arrangement 1 .
  • the above-described DC-DC converter arrangement 1 and in particular the control device 20 can also include any components that are required to implement the method described below.
  • a first ratio between the input current I Jn and the output current I_out of the DC-DC converter 10 is calculated.
  • This first ratio is calculated, in particular, using a control parameter, such as a duty cycle D, that is required for driving the DC-DC converter.
  • step S2 a second ratio between input current I Jn and output current I_out of DC-DC converter 10 is calculated in parallel.
  • This second ratio is calculated in particular using an input voltage U Jn and an output voltage U_out of the DC-DC converter. As already mentioned above, the second ratio is calculated here without taking the pulse duty factor D into account.
  • a malfunction can then be detected in step S3 if the two calculated ratios deviate from one another.
  • a malfunction can be detected if the two calculated ratios deviate from one another by more than a predefined threshold value.
  • the method for controlling the DC-DC converter 10 can in particular include a step for detecting the output voltage U_out of the DC-DC converter 10 . Based on this detected voltage value of the output voltage U_out, a Control parameters, such as a duty cycle D for a pulse width modulated control of the DC-DC converter 10 are determined. In this way, a control circuit for setting a predetermined setpoint for the output voltage U_out of the DC-DC converter 10 can be implemented. The pulse duty factor D determined by this control loop can thus be used to determine the ratio between the input current I Jn and the output current I_out of the DC/DC converter 10 to calculate the first ratio in step S1.
  • step S3 the activation of the DC-DC converter 10 can then be stopped, for example.
  • the actuation of the DC-DC converter 10 can also only be restricted, or only a signal for a malfunction can be output to a further instance.
  • the present invention relates to a plausibility check of operating parameters, in particular of sensor-detected input and output values of a DC-DC converter.
  • a ratio between the input current and the output current of a DC-DC converter is calculated on the basis of two different calculation methods, the different calculation methods being based at least in part on different parameters. If the two calculation methods lead to the same or at least approximately the same ratio of input current to output current, the reliability of the parameters used can be checked for plausibility in this way.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne la vérification de paramètres de fonctionnement, en particulier de valeurs d'entrée et de sortie d'un convertisseur continu-continu qui sont détectées par un capteur. À cet effet, le rapport entre le courant d'entrée et le courant de sortie d'un convertisseur continu-continu est calculé sur la base de deux procédés de calcul différents, les différents procédés de calcul étant au moins partiellement basés sur des paramètres différents. Si les deux procédés de calcul conduisent à un rapport identique ou au moins approximativement identique entre le courant d'entrée et le courant de sortie, il est possible de procéder à un contrôle de plausibilité de la fiabilité des paramètres utilisés.
EP21787433.8A 2020-12-01 2021-10-06 Dispositif de commande pour convertisseur continu-continu, convertisseur continu-continu et procédé d'actionnement d'un convertisseur continu-continu Pending EP4256684A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020215123.7A DE102020215123A1 (de) 2020-12-01 2020-12-01 Steuervorrichtung für einen Gleichspannungswandler, Gleichspannungswandlervorrichtung sowie Verfahren zur Ansteuerung eines Gleichspannungswandlers
PCT/EP2021/077571 WO2022117246A1 (fr) 2020-12-01 2021-10-06 Dispositif de commande pour convertisseur continu-continu, convertisseur continu-continu et procédé d'actionnement d'un convertisseur continu-continu

Publications (1)

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EP4256684A1 true EP4256684A1 (fr) 2023-10-11

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Application Number Title Priority Date Filing Date
EP21787433.8A Pending EP4256684A1 (fr) 2020-12-01 2021-10-06 Dispositif de commande pour convertisseur continu-continu, convertisseur continu-continu et procédé d'actionnement d'un convertisseur continu-continu

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US (1) US20240006983A1 (fr)
EP (1) EP4256684A1 (fr)
CN (1) CN116547893A (fr)
DE (1) DE102020215123A1 (fr)
WO (1) WO2022117246A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19507084A1 (de) 1995-03-01 1996-09-12 Bosch Gmbh Robert Als Schaltregler ausgebildeter Sperrwandler
JP6522211B1 (ja) * 2018-07-02 2019-05-29 三菱電機株式会社 電力変換装置

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US20240006983A1 (en) 2024-01-04
DE102020215123A1 (de) 2022-06-02
CN116547893A (zh) 2023-08-04
WO2022117246A1 (fr) 2022-06-09

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