JP7340975B2 - DC/DC converter system, operation instruction circuit, and DC/DC converter system control method - Google Patents

Description

The present invention relates to a DC/DC converter system, an operation instruction circuit, and a method of controlling the DC/DC converter system.

BACKGROUND ART Conventionally, there is a load driving system that drives two DC/DC converters in parallel (for example, see Patent Document 1).

In such a conventional load driving system, the output current of each DC/DC converter is detected and controlled so that the output current of each DC/DC converter is shared equally.

However, in this conventional load driving system, since DC/DC converters having the same efficiency and operating range are used, there is a problem that it is not possible to expand the operating range while improving efficiency.

JP2014-183705

Therefore, an object of the present invention is to provide a DC/DC converter system that can expand the operating range while improving efficiency.

A DC/DC converter system according to one aspect of the present invention includes:
A DC/DC converter system that supplies power to a load using a plurality of DC/DC converters according to a load request, the system comprising:
a main DC/DC converter to which a power supply voltage is supplied and outputs a first output voltage from an output section;
one or more sub DC/DC converters to which the power supply voltage is supplied and which outputs a second output voltage from an output section,
The sub DC/DC converter is characterized in that an operating range for input voltage is set wider than an operating range for the input voltage of the main DC/DC converter.

In the DC/DC converter system,
The input range of the power supply voltage is set so that the main DC/DC converter and the sub DC/DC converter operate within the set range.

In the DC/DC converter system,
The main DC/DC converter includes a center tap rectifier circuit that rectifies a first voltage generated from the power supply voltage, and outputs a first output voltage from the output section based on the voltage rectified by the center tap rectifier circuit. output,
The sub DC/DC converter includes a bridge rectifier circuit that rectifies a second voltage generated from the power supply voltage, and outputs the second output voltage from the output section based on the voltage rectified by the bridge rectifier circuit. It is characterized by:

In the DC/DC converter system,
At least the sub DC/DC converter can be driven to continue supplying power in an operating region where the power supply battery that supplies the power supply voltage is overcharged.

In the DC/DC converter system,
At least the sub DC/DC converter can be driven to continue supplying power in an operating region where the power supply battery that supplies the power supply voltage is over-discharged.

In the DC/DC converter system,
It is characterized by further comprising an operation instruction section that controls the main DC/DC converter and the sub DC/DC converter.

In the DC/DC converter system,
The operation instruction section includes:
When the sum of the output power of the main DC/DC converter and the output power of the sub DC/DC converter reaches a preset power threshold, the first output voltage of the main DC/DC converter and the The second output voltage of the sub-DC/DC converter is reduced to limit the power supplied.

In the DC/DC converter system,
The operation instruction section includes:
If the current flowing through the output voltage terminal to which the load is connected exceeds a preset overcurrent threshold, the main DC/DC converter and the sub DC/DC converter are stopped.

In the DC/DC converter system,
The main DC/DC converter is
a first full-bridge circuit that converts and outputs a voltage based on the power supply voltage;
further comprising a first transformer into which the voltage output by the first full-bridge circuit is input to the primary side and outputs the first voltage from the secondary side to the center tap rectifier circuit;
The sub DC/DC converter is
a second full-bridge circuit that converts and outputs a voltage based on the power supply voltage;
The present invention is characterized in that it further includes a second transformer into which the voltage output by the second full-bridge circuit is input to the primary side and which outputs the second voltage from the secondary side to the bridge rectifier circuit.

In the DC/DC converter system,
The main DC/DC converter is
a first output choke, one end of which is connected to a portion of the secondary coil of the first transformer, and the other end of which is electrically connected to an output voltage terminal to which the load is connected;
further comprising a first output capacitor, one end of which is connected to the other end of the first output choke, and the other end of which is electrically connected to the ground terminal;
The sub DC/DC converter is
a second output choke, one end of which is connected to the cathodes of the first diode and the second diode, and the other end of which is electrically connected to the output voltage terminal;
The device further includes a second output capacitor, one end of which is connected to the other end of the second output choke, and the other end of which is electrically connected to the ground terminal.

In the DC/DC converter system,
The DC/DC converter system is characterized in that it is installed in an automobile equipped with an automatic driving function.

A method for controlling a DC/DC converter system according to one aspect of the present invention includes:
A DC/DC converter system supplies power to a load using a plurality of DC/DC converters according to a load request, the main DC being supplied with a power supply voltage and outputting a first output voltage from an output section. /DC converter, and one or more sub DC/DC converters that are supplied with the power supply voltage and output a second output voltage from an output section, the method comprising:
Controlling the driving of the main DC/DC converter and the sub DC/DC converter according to the load request,
The sub DC/DC converter is characterized in that an operating range for input voltage is set wider than an operating range for the input voltage of the main DC/DC converter.

An operation instruction circuit according to one aspect of the present invention includes:
A DC/DC converter system supplies power to a load using a plurality of DC/DC converters according to a load request, the main DC being supplied with a power supply voltage and outputting a first output voltage from an output section. /DC converter; and one or more sub DC/DC converters that are supplied with the power supply voltage and output a second output voltage from an output section. And,
The operation instruction circuit is
Controlling the driving of the main DC/DC converter and the sub DC/DC converter according to the load request,
The sub DC/DC converter is characterized in that an operating range for input voltage is set wider than an operating range for the input voltage of the main DC/DC converter.

A DC/DC converter system according to one aspect of the present invention is a DC/DC converter system that uses a plurality of DC/DC converters to supply power to a load according to a load request, and is configured to supply power to a load using a plurality of DC/DC converters. , a main DC/DC converter that outputs a first output voltage from the output section, and one or more sub DC/DC converters that are supplied with a power supply voltage and output a second output voltage from the output section. .

The operating range for the input voltage of the sub DC/DC converter is set wider than the operating range for the input voltage of the main DC/DC converter.

Thereby, according to the DC/DC converter system according to one aspect of the present invention, it is possible to expand the operating range while improving efficiency.

FIG. 1 is a circuit diagram showing an example of a circuit configuration of a DC/DC converter system 100 according to an embodiment of the present invention. 2 is a diagram showing an example of an input/output characteristic X1A of a main DC/DC converter X1 and an input/output characteristic X2A of a sub DC/DC converter X2 of the DC/DC converter system 100 shown in FIG. 1. FIG.

Hereinafter, a DC/DC converter system according to the present invention will be explained with reference to the drawings.

FIG. 1 is a circuit diagram showing an example of a circuit configuration of a DC/DC converter system 100 according to an embodiment of the present invention.

[DC/DC converter system]
The DC/DC converter system 100 shown in FIG. 1 uses a plurality of DC/DC converters to supply power to the vehicle load LOAD from a power supply battery BS in accordance with the load request of the vehicle load LOAD. There is.

This DC/DC converter system 100 is installed in, for example, an automobile (not shown) equipped with an automatic driving function and is applied to supply electric power to the automobile, and the power supply battery BS and the load battery BOUT are It is loaded on the vehicle. Note that this DC/DC converter system 100 can be applied not only to automobiles but also to other devices such as drones.

For example, as shown in FIG. 1, this DC/DC converter system 100 includes a main DC/DC converter (first DC/DC converter) X1 and a sub DC/DC converter (second DC/DC converter) X2. , a first output fuse FO1, a second output fuse FO2, and an operation instruction unit (operation instruction circuit) ECU.

Although one sub DC/DC converter X2 is shown in FIG. 1 as an example, the DC/DC converter system 100 may include a plurality of sub DC/DC converters X2. Furthermore, the circuit configuration of the main DC/DC converter X1 and the circuit configuration of the sub DC/DC converter X2 may be replaced.

For example, as shown in FIG. 1, a vehicle load LOAD is connected between the output voltage terminal TOUT and the ground terminal TGND.

Further, for example, as shown in FIG. 1, a battery BOUT is connected between the output voltage terminal TOUT and the ground terminal TGND.

[Main DC/DC converter]
For example, as shown in FIG. 1, the main DC/DC converter X1 is configured to be supplied with a power supply voltage VB from a power supply battery BS via first and second input parts TIN1a and TIN1b.

In the main DC/DC converter X1, the first output section TO1a is electrically connected to the output voltage terminal TOUT, and the second output section TO1b is electrically connected to the ground terminal TGND.

The main DC/DC converter X1 outputs the first output voltage VO1 from the first output section TO1a.
Here, as shown in FIG. 1, the main DC/DC converter X1 includes, for example, a first fuse FI1, a first line filter circuit LF1, a first full bridge circuit FBM1, and a first transformer. MT1, a center tap rectifier circuit CTR, a first output choke LO1, a first output capacitor CO1, and a first control section A1.

The first fuse FI1 is connected between the first input section TIN1a and the first line filter circuit LF1.

Further, the first line filter circuit LF1 filters the power supply voltage VB supplied from the power supply battery BS via the first and second input parts TIN1a and TIN1b, and supplies the filtered power supply voltage VB to the first full bridge circuit FBM1. It is designed to be output.
Further, the first full-bridge circuit FBM1 converts a voltage based on the power supply voltage VB into alternating current and outputs the converted alternating current.

In this first full-bridge circuit FBM1, switch elements (nMOS transistors) Q1, Q2, Q3, and Q4 constituting the bridge circuit are controlled by a first control section A1.

In addition, the first transformer MT1 receives the voltage output from the first full-bridge circuit FBM1 on its primary side, and transfers the first voltage VT1 from its secondary side to the first and second input nodes of the center-tap rectifier circuit CTR. It is designed to output to N1 and N2.

That is, the first voltage VT1 output from the first transformer MT1 is applied to the first and second input nodes N1 and N2 of the center tap rectifier circuit CTR.

The center tap rectifier circuit CTR rectifies the first voltage VT1.

This center tap rectifier circuit CTR includes, for example, as shown in FIG. 1, first transistors (switch elements) Q500 and Q501 and second transistors (switch elements) Q600 and Q601.

The first transistors Q500 and Q501 have one end (drain) connected to the first input node N1, and the other end (source) connected to the ground terminal TGND (second output section TO1b).

The first transistors Q500 and Q501 are, for example, nMOS transistors controlled by the first control unit A1, as shown in FIG.

Further, the second transistors Q600 and Q601 have one end (drain) connected to the second input node N2, and the other end (source) connected to the ground terminal TGND (second output section TO1b).

The second transistors Q600 and Q601 are, for example, nMOS transistors controlled by the first control unit A1, as shown in FIG.

These first transistors Q500, Q501 and second transistors Q600, Q601 are controlled by the first control unit A1 to operate in oscillation.

Further, the first output choke LO1 has one end connected to a part of the secondary coil of the first transformer MT1 (for example, a tap in the middle part), and the other end connected to the first output part TO1a and the first output choke LO1. is electrically connected to the output voltage terminal TOUT via the output fuse FO1.

Further, the first output capacitor CO1 is connected between the first output section TO1a and the second output section TO1b of the main DC/DC converter X1. In particular, one end of the first output capacitor CO1 is connected to the other end of the first output choke LO1, and the other end is electrically connected to the ground terminal TGND (second output section TO1b).

The first control unit A1 also controls the operation of the first full bridge circuit FBM1 and the center tap rectifier circuit CTR (that is, the operation of each transistor) so that the main DC/DC converter X1 outputs a predetermined voltage. is designed to be controlled.

As described above, the main DC/DC converter The output voltage VO1 is outputted from the first output section TO1a.

Note that the main DC/DC converter X1 may have a bridge rectifier circuit instead of the center tap rectifier circuit CTR, if necessary.

[Sub DC/DC converter]
Here, the sub DC/DC converter X2 is supplied with the power supply voltage VB from the power supply battery BS via the third and fourth input parts TIN2a and TIN2b, for example, as shown in FIG. There is.

In this sub DC/DC converter X2, the third output section TO2a is electrically connected to the output voltage terminal TOUT, and the fourth output section TO2b is electrically connected to the ground terminal TGND. The sub DC/DC converter X2 is configured to output the second output voltage VO2 from the third output section TO2a.

Further, as shown in FIG. 1, the sub DC/DC converter X2 includes, for example, a second fuse FI2, a second line filter circuit LF2, a second full bridge circuit FBM2, and a second transformer MT2. , a bridge rectifier circuit FBR, a second output choke LO2, a second output capacitor CO2, and a second control section A2.

The second fuse FI2 is connected between the third input section TIN2a and the second line filter circuit LF3.

Further, the second line filter circuit LF2 filters the power supply voltage VB supplied from the power supply battery BS via the third and fourth input parts TIN2a and TIN2b, and supplies the filtered power supply voltage VB to the second full bridge circuit FBM2. It is designed to be output.

Further, the second full-bridge circuit FBM2 converts a voltage based on the power supply voltage VB into alternating current and outputs the converted alternating current.

In the second full-bridge circuit FBM2, the second control unit A2 controls switch elements (nMOS transistors) Q5, Q6, Q7, and Q8 that constitute the bridge circuit.

In addition, the second transformer MT2 receives the voltage output from the second full-bridge circuit FBM2 on its primary side, and transfers the second voltage VT2 from its secondary side to the third and fourth input nodes N3 of the bridge rectifier circuit FBR. , N4.

That is, the second voltage VT2 output from the second transformer MT2 is applied to the third and fourth input nodes N3 and N4 of the bridge rectifier circuit FBR.

The bridge rectifier circuit FBR rectifies the second voltage VT2.

For example, as shown in FIG. 1, this bridge rectifier circuit FBR includes a first diode (rectifier) Da, a second diode (rectifier) Db, a third transistor (switch element) Ma, and a third transistor (switch element) Ma. 4 transistors (switch elements) Mb.

The first diode Da has a cathode electrically connected to the output voltage terminal TOUT via the second output choke LO2 and the second output fuse FO2, and an anode connected to the third input node N3. ing.

Further, the second diode Db has a cathode electrically connected to the output voltage terminal TOUT via the second output choke LO2 and the second output fuse FO2, and an anode connected to the fourth input node N4. ing.

Further, the third transistor Ma has one end (drain) connected to the third input node N3, and the other end (source) connected to the ground terminal TGND.

This third transistor Ma is, for example, an nMOS transistor controlled by the second control unit A2, as shown in FIG.

Further, the fourth transistor Mb has one end (drain) connected to the fourth input node N4, and the other end (source) connected to the ground terminal TGND.

This fourth transistor Mb is, for example, an nMOS transistor controlled by the second control unit A2, as shown in FIG.

The third and fourth transistors Ma and Mb are connected in series to the first diodes Da and Db, respectively. The third and fourth transistors Ma and Mb are controlled by the second control section A2 to operate in oscillation.

Further, the second output choke LO2 is connected, for example, between the cathodes of the first diode Da and the second diode Db and the third output section TO2a of the sub DC/DC converter X2, as shown in FIG. It is connected to the.

In particular, this second output choke LO2 has one end connected to the cathodes of the first diode Da and the second diode Db, and the other end connected to the third output section TO2a and the second output fuse FO2. , are electrically connected to the output voltage terminal TOUT.

Further, the second output capacitor CO2 is connected between the third output section TO2a and the fourth output section TO2b of the sub DC/DC converter X2, for example, as shown in FIG. In particular, one end of the second output capacitor CO2 is connected to the other end of the second output choke LO2, and the other end is electrically connected to the ground terminal TGND (fourth output section TO2b).

Further, the second control unit A2 controls the operation of the second full bridge circuit FBM2 and the bridge rectifier circuit FBR (that is, the operation of each transistor) so that the sub DC/DC converter X2 outputs a predetermined voltage, for example. It is meant to be controlled.

As described above, the sub DC/DC converter X2 has the bridge rectifier circuit FBR that rectifies the second voltage VT2 generated from the power supply voltage VB, and the second The output voltage VO2 is output from the third output section TO3a.

Note that this sub DC/DC converter X2 may have a center tap rectifier circuit instead of the bridge rectifier circuit FBR, if necessary.

[Characteristics of main DC/DC converter and sub DC/DC converter]
Here, FIG. 2 is a diagram showing an example of the input/output characteristics X1A of the main DC/DC converter X1 and the input/output characteristics X2A of the sub DC/DC converter X2 of the DC/DC converter system 100 shown in FIG. 1.

For example, as shown in FIG. 2, the operating range X2R for the input voltage of the sub DC/DC converter X2 is set wider than the operating range X1R for the input voltage of the main DC/DC converter X1.

Note that the input range of the power supply voltage VB is set so that the main DC/DC converter X1 and the sub DC/DC converter X2 operate within the set range Z.

Furthermore, in the operating region (region on the low voltage side of the setting region Z) where the power supply battery BS that supplies the power supply voltage VB is over-discharged, at least the sub DC/DC converter X2 is driven to supply power. It is possible to continue.

[First and second output fuses]
Further, the first output fuse FO1 is electrically connected between the first output section TO1a of the main DC/DC converter X1 and the output voltage terminal TOUT to which the vehicle load LOAD and the battery BOUT are connected. There is.

Further, the second output fuse FO2 is electrically connected between the third output section TO2a of the sub DC/DC converter X2 and the output voltage terminal TOUT.

[Operation instruction section]
Further, the operation instruction unit (operation instruction circuit) ECU is configured to control a vehicle (automobile) in which the DC/DC converter system 100 is loaded.

In particular, this operation instruction unit ECU sets the output voltage in the first control unit A1 of the main DC/DC converter X1 and the second control unit A2 of the sub DC/DC converter X2 according to the load request. The control signal is output to control the driving of the main DC/DC converter X1 and the sub DC/DC converter X2.

For example, the operation instruction unit ECU issues a control signal when the sum of the output power of the main DC/DC converter X1 and the output power of the sub DC/DC converter X2 does not reach a preset power threshold. The first output voltage VO1 of the main DC/DC converter X1 and the second output voltage VO2 of the sub DC/DC converter X2 are set to predetermined target values.

Thereby, the DC/DC converter system 100 is configured to supply a predetermined amount of power.

On the other hand, when the sum of the output power of the main DC/DC converter X1 and the output power of the sub DC/DC converter X2 reaches the above-described power threshold, the operation instruction unit ECU The first output voltage VO1 and the second output voltage VO2 of the sub DC/DC converter X2 are lowered from predetermined target values.

Thereby, the DC/DC converter system 100 limits the power it supplies.

For example, the operation instruction unit ECU is configured to stop the main DC/DC converter X1 and the sub DC/DC converter X2 when the current flowing through the output voltage terminal TOUT exceeds a preset overcurrent threshold. It has become.

Next, an example of a method of controlling the DC/DC converter system 100 having the above configuration will be described.

As described above, the first control unit A1 of the main DC/DC converter X1 controls the first full bridge circuit FBM1 and the center tap rectifier so that the main DC/DC converter X1 outputs a predetermined voltage. Controls the operation of circuit CTR.

Similarly, the second control unit A2 of the sub DC/DC converter X1 operates the second full bridge circuit FBM2 and the bridge rectifier circuit FBR so that the sub DC/DC converter X2 outputs a predetermined voltage. control.

The operation instruction unit ECU then controls the first control unit A1 of the main DC/DC converter X1 and the second control unit A2 of the sub DC/DC converter X2 to set the output voltage according to the load request. A control signal is output to control the driving of the main DC/DC converter X1 and the sub DC/DC converter X2.

For example, the operation instruction unit ECU issues a control signal when the sum of the output power of the main DC/DC converter X1 and the output power of the sub DC/DC converter X2 does not reach a preset power threshold. The first output voltage VO1 of the main DC/DC converter X1 and the second output voltage VO2 of the sub DC/DC converter X2 are set to predetermined target values.

Thereby, the DC/DC converter system 100 supplies predetermined power.

On the other hand, when the sum of the output power of the main DC/DC converter X1 and the output power of the sub DC/DC converter X2 reaches the above-described power threshold, the operation instruction unit ECU The first output voltage VO1 and the second output voltage VO2 of the sub DC/DC converter X2 are lowered from predetermined target values.

Thereby, the DC/DC converter system 100 limits the power to be supplied.

Note that, for example, when the current flowing to the output voltage terminal TOUT exceeds a preset overcurrent threshold, the operation instruction unit ECU stops the main DC/DC converter X1 and the sub DC/DC converter X2.

Here, as shown in FIG. 2 described above, the operating range X2R for the input voltage of the sub DC/DC converter X2 is set wider than the operating range X1R for the input voltage of the main DC/DC converter X1.

As a result, even if the input voltage exceeds the operating range X1R of the main DC/DC converter X1, if the input voltage is within the operating range X2R of the sub DC/DC converter X2, at least Sub DC/DC converter X2 can operate and supply power.

Thereby, when the input voltage is within the operating range X1R of the main DC/DC converter X1, the main DC/DC converter X1 also operates, and power can be supplied with high efficiency.

Note that the input range of the power supply voltage VB is set so that the main DC/DC converter X1 and the sub DC/DC converter X2 operate within the set range Z.

Thereby, the DC/DC converter system 100 can supply predetermined power based on the power supply voltage VB.

Furthermore, in the operating region (region on the low voltage side of the setting region Z) where the power supply battery BS that supplies the power supply voltage VB is over-discharged, at least the sub DC/DC converter X2 is driven to supply power. It is possible to continue.

As a result, even if the power supply battery BS that supplies the power supply voltage VB is over-discharged, if the input voltage is within the operating range X2R of the sub-DC/DC converter X2, at least the sub-DC/DC converter DC converter X2 can operate and supply power.

As described above, a DC/DC converter system according to one aspect of the present invention is a DC/DC converter system that supplies power to a load using a plurality of DC/DC converters according to a load request, and includes: The main DC/DC converter is supplied with a power supply voltage and outputs a first output voltage from the output section, and the sub DC/DC converter is supplied with a power supply voltage and outputs a second output voltage from the output section. .

The operating range for the input voltage of the sub DC/DC converter is set wider than the operating range for the input voltage of the main DC/DC converter.

Thereby, according to the DC/DC converter system according to one aspect of the present invention, it is possible to expand the operating range while improving efficiency.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention as well as within the scope of the invention described in the claims and its equivalents.

100 DC/DC converter system X1 Main DC/DC converter X2 Sub DC/DC converter FO1 First output fuse FO2 Second output fuse ECU Operation instruction section (operation instruction circuit)
BS Power supply battery TOUT Output voltage terminal TGND Ground terminal TIN1a First input section TIN1b Second input section TO1a First output section TO1b Second output section FI1 First fuse LF1 First line filter circuit FBM1 First Full bridge circuit MT1 First transformer CTR Center tap rectifier circuit LO1 First output choke CO1 First output capacitor A1 First control section TIN2a Third input section TIN2b Fourth input section TO2a Third output section TO2b Fourth output section FI2 Second fuse LF2 Second line filter circuit FBM2 Second full bridge circuit MT2 Second transformer FBR Bridge rectifier circuit LO2 Second output choke CO2 Second output capacitor A2 Second control part

Claims (11)

A DC/DC converter system that supplies power to a load using a plurality of DC/DC converters according to a load request, the system comprising:
a main DC/DC converter to which a power supply voltage is supplied and outputs a first output voltage from an output section;
one or more sub-DC/DC converters to which the power supply voltage is supplied and which outputs a second output voltage from an output section;
an operation instruction section that controls the main DC/DC converter and the sub DC/DC converter,
The operating range for the input voltage of the sub DC/DC converter is set wider than the operating range for the input voltage of the main DC/DC converter,
The operation instruction section includes:
If the current flowing through the output voltage terminal to which the load is connected exceeds a preset overcurrent threshold, the main DC/DC converter and the sub DC/DC converter are stopped.
A DC/DC converter system characterized by: The DC/DC converter system according to claim 1, wherein the input range of the power supply voltage is set so that the main DC/DC converter and the sub DC/DC converter operate in the operating region. . The main DC/DC converter includes a center tap rectifier circuit that rectifies a first voltage generated from the power supply voltage, and outputs the first output voltage based on the voltage rectified by the center tap rectifier circuit. Output from
The sub DC/DC converter includes a bridge rectifier circuit that rectifies a second voltage generated from the power supply voltage, and outputs the second output voltage from the output section based on the voltage rectified by the bridge rectifier circuit. The DC/DC converter system according to claim 1 or 2, characterized in that: At least the sub DC/DC converter can be driven to continue supplying power in an operating region where the power supply battery that supplies the power supply voltage is overcharged. The DC/DC converter system according to any one of Items 1 to 3. At least the sub DC/DC converter can be driven to continue supplying power in an operating region where the power supply battery that supplies the power supply voltage is over-discharged. The DC/DC converter system according to any one of Items 1 to 4. The operation instruction section includes:
When the sum of the output power of the main DC/DC converter and the output power of the sub DC/DC converter reaches a preset power threshold, the first output voltage of the main DC/DC converter and the The DC/DC converter system according to claim 1 , wherein the second output voltage of the sub-DC/DC converter is reduced to limit the supplied power. The main DC/DC converter is
a first full-bridge circuit that converts and outputs a voltage based on the power supply voltage;
further comprising a first transformer into which the voltage output by the first full-bridge circuit is input to the primary side and outputs the first voltage from the secondary side to the center tap rectifier circuit;
The sub DC/DC converter is
a second full-bridge circuit that converts and outputs a voltage based on the power supply voltage;
A claim further comprising: a second transformer into which the voltage output by the second full-bridge circuit is input to the primary side and outputs the second voltage from the secondary side to the bridge rectifier circuit. The DC/DC converter system according to item 3 . The main DC/DC converter is
a first output choke, one end of which is connected to a portion of the secondary coil of the first transformer, and the other end of which is electrically connected to an output voltage terminal to which the load is connected;
further comprising a first output capacitor, one end of which is connected to the other end of the first output choke, and the other end of which is electrically connected to a ground terminal ;
The sub DC/DC converter is
a second output choke having one end connected to the bridge rectifier circuit and the other end electrically connected to the output voltage terminal;
The DC according to claim 7 , further comprising a second output capacitor, one end of which is connected to the other end of the second output choke, and the other end of which is electrically connected to the ground terminal. /DC converter system. The DC/DC converter system according to any one of claims 1 to 8 , wherein the DC/DC converter system is installed in an automobile equipped with an automatic driving function. A DC/DC converter system supplies power to a load using a plurality of DC/DC converters according to a load request, the main DC being supplied with a power supply voltage and outputting a first output voltage from an output section. /DC converter, one or more sub DC/DC converters to which the power supply voltage is supplied and outputs a second output voltage from an output section, and controlling the main DC/DC converter and the sub DC/DC converter. 1. A method for controlling a DC/DC converter system , comprising :
Controlling the driving of the main DC/DC converter and the sub DC/DC converter according to the load request,
The operating range for the input voltage of the sub DC/DC converter is set wider than the operating range for the input voltage of the main DC/DC converter,
The operation instruction section includes:
If the current flowing through the output voltage terminal to which the load is connected exceeds a preset overcurrent threshold, the main DC/DC converter and the sub DC/DC converter are stopped.
A method for controlling a DC/DC converter system, characterized in that: A DC/DC converter system supplies power to a load using a plurality of DC/DC converters according to a load request, the main DC being supplied with a power supply voltage and outputting a first output voltage from an output section. /DC converter, one or more sub DC/DC converters to which the power supply voltage is supplied and outputs a second output voltage from an output section, and controlling the main DC/DC converter and the sub DC/DC converter. An operation instruction circuit applied to a DC/DC converter system comprising:
The operation instruction circuit is
Controlling the driving of the main DC/DC converter and the sub DC/DC converter according to the load request,
The operating range for the input voltage of the sub DC/DC converter is set wider than the operating range for the input voltage of the main DC/DC converter,
The operation instruction section includes:
If the current flowing through the output voltage terminal to which the load is connected exceeds a preset overcurrent threshold, the main DC/DC converter and the sub DC/DC converter are stopped.
An operation instruction circuit characterized by:

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