CN110798069A

CN110798069A - DC converter, and control method and device for DC converter

Info

Publication number: CN110798069A
Application number: CN201810865709.6A
Authority: CN
Inventors: 王恰; 周建平
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2018-08-01
Filing date: 2018-08-01
Publication date: 2020-02-14
Also published as: WO2020024731A1

Abstract

The invention provides a direct current converter, and a control method and device of the direct current converter. The method comprises the following steps: acquiring a first voltage and a second voltage; adjusting a voltage range of a total output voltage determined by the first voltage and the second voltage and determining to output a constant power within the voltage range; performing voltage stabilization treatment on the total output voltage; and outputting the total output voltage subjected to voltage stabilization. The invention solves the problems of limited output voltage range, complex system structure and high cost of the DC converter provided by the related technology, and achieves the effects of wide output voltage range and constant power output within the range.

Description

DC converter, and control method and device for DC converter

Technical Field

The invention relates to the field of communication, in particular to a direct current converter, and a control method and device of the direct current converter.

Background

With the rapid development of science and technology, various novel products are continuously emerging, and higher requirements are also provided. In most scenarios it may be desirable to provide a wide range of output voltages and still require higher power to be provided over the wide range of output voltages. This requirement is easily fulfilled with a lower equivalent power current at high voltage output, and then the output current is inevitably increased with difficulty or not at all at low voltage output with the same power.

In the field of switching power supplies, the input terminal of a direct current converter (DC/DC) part for converting a fixed direct current voltage into a variable direct current voltage in the current switching power supply power circuit topology is mostly a fixed value bus voltage provided by a previous stage Power Factor Correction (PFC). For a fixed input voltage, if a wide voltage range is required to be output, a circuit topology is required to have a wide voltage gain adjustment capability, however, the existing power circuit topology is difficult to realize a wide output range.

For example: in the field of electric automobile charging modules, constant power output in the whole range cannot be realized in a 200-750 VDC output voltage range, the high-power output scene is often met by increasing the number of power modules, and then wide voltage output is realized by connecting multiple cabinets in series. The obvious drawbacks of this mode of operation are: the system is complex in structure and high in cost.

Disclosure of Invention

The embodiment of the invention provides a direct current converter, a control method and a control device of the direct current converter, and aims to at least solve the problems of limited output voltage range of the direct current converter, complex system structure and high cost in the related art.

According to an embodiment of the present invention, there is provided a direct current converter including: the power supply comprises a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit, a first filter capacitor, a second filter capacitor and an output filter unit;

a first power conversion unit, a first end of which is connected with the first switching unit and a second end of which is connected with the second switching unit, for outputting a first voltage; a second power conversion unit, a first end of which is connected with the first switching unit and a second end of which is connected with the second switching unit, for outputting a second voltage; the first switching unit is connected with the second switching unit and is used for adjusting the voltage range of the total output voltage determined by the first voltage and the second voltage and determining that constant power is output in the voltage range; the first filter capacitor and the second filter capacitor are connected in series, the first filter capacitor and the second filter capacitor are connected in parallel to a first end of the first power conversion unit and a second end of the second power conversion unit, and a connection point between the first filter capacitor and the second filter capacitor is connected to a connection point between the first switching unit and the second switching unit; the first filter capacitor and the second filter capacitor are jointly used for carrying out voltage stabilization treatment on the total output voltage; and the output filtering unit is respectively connected with the first end of the first power conversion unit and the second end of the second power conversion unit and is used for outputting the total output voltage subjected to voltage stabilization processing.

In an alternative embodiment, the first power conversion unit or the second power conversion unit comprises one of: the phase-shifted full-bridge circuit, the resonance conversion circuit and the secondary side rectifying circuit.

In an alternative embodiment, the first switching unit comprises: first combination switch and second combination switch, the second switching unit includes: the first end of the first compound switch is connected with the first end of the first power conversion unit, and the second end of the first compound switch is connected with the first end of the second compound switch; the second end of the second compound switch is connected with the first end of the third compound switch; the second end of the third compound switch is connected with the first end of the fourth compound switch; and the second end of the fourth compound switch is connected with the second end of the second power conversion unit.

In an alternative embodiment, each of the first compound switch, the second compound switch, the third compound switch and the fourth compound switch includes: a first switching device and a second switching device, wherein the first switching device is closed before the second switching device and the first switching device is opened later than the second switching device.

In an alternative embodiment, the first compound switch is turned on and off simultaneously with a first switching device in the fourth compound switch, and the first compound switch is turned on and off simultaneously with a second switching device in the fourth compound switch.

In an alternative embodiment, the second compound switch is turned on and off simultaneously with the first switching device in the third compound switch, and the second compound switch is turned on and off simultaneously with the second switching device in the third compound switch.

According to another embodiment of the present invention, there is provided another dc converter including: the power conversion device comprises a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit and an output filtering unit; a first power conversion unit, a first end of which is connected with the first switching unit and a second end of which is connected with the second switching unit, for outputting a first voltage; a second power conversion unit, a first end of which is connected with the first switching unit and a second end of which is connected with the second switching unit, for outputting a second voltage; the first switching unit is connected with the second switching unit and is used for adjusting the voltage range of the total output voltage determined by the first voltage and the second voltage and outputting constant power in the voltage range; and the output filtering unit is respectively connected with the first end of the first power conversion unit and the second end of the second power conversion unit and is used for outputting the total output voltage subjected to voltage stabilization processing.

According to still another embodiment of the present invention, there is provided a control method of a dc converter including:

acquiring a first voltage and a second voltage; adjusting a voltage range of a total output voltage determined by the first voltage and the second voltage and determining to output a constant power within the voltage range; performing voltage stabilization treatment on the total output voltage; and outputting the total output voltage subjected to voltage stabilization.

In an alternative embodiment, the dc converter comprises: first switching unit, second switching unit, first switching unit includes: first combination switch and second combination switch, the second switching unit includes: a third compound switch and a fourth compound switch, each compound switch comprising: a first switching device and a second switching device, wherein the first switching device is closed before the second switching device and the first switching device is opened later than the second switching device, adjusting a voltage range of a total output voltage and determining to output a constant power within the voltage range comprises: controlling the first switch devices in the first compound switch and the fourth compound switch to be simultaneously conducted so as to enable the first voltage and the second voltage to be output in parallel, and obtaining a first partial voltage range of the total output voltage; controlling the first switch devices in the second compound switch and the third compound switch to be conducted simultaneously so as to enable the first voltage and the second voltage to be output in series, and obtaining a second partial voltage range of the total output voltage; the voltage range of the total output voltage is adjusted by using the first partial voltage range and the second partial voltage range, and the constant power is determined to be output in the voltage range.

According to still another embodiment of the present invention, there is provided a control apparatus of a dc converter including:

the acquisition module is used for acquiring a first voltage and a second voltage; an adjusting module for adjusting a voltage range of a total output voltage determined by the first voltage and the second voltage and determining to output a constant power within the voltage range; the processing module is used for carrying out voltage stabilization processing on the total output voltage; and the output module is used for outputting the total output voltage subjected to voltage stabilization.

In an alternative embodiment, the dc converter comprises: first switching unit, second switching unit, first switching unit includes: first combination switch and second combination switch, the second switching unit includes: a third compound switch and a fourth compound switch, each compound switch comprising: a first switching device and a second switching device, wherein the first switching device is closed before the second switching device and the first switching device is opened later than the second switching device, an adjustment module comprising: the first control unit is used for controlling the first switch devices in the first compound switch and the fourth compound switch to be simultaneously conducted so as to enable the first voltage and the second voltage to be output in parallel, and a first partial voltage range of the total output voltage is obtained; the second control unit is used for controlling the first switch devices in the second compound switch and the third compound switch to be simultaneously conducted so as to enable the first voltage and the second voltage to be output in series and obtain a second partial voltage range of the total output voltage; and an adjusting unit for adjusting a voltage range of the total output voltage using the first partial voltage range and the second partial voltage range and determining to output a constant power within the voltage range.

According to still another embodiment of the present invention, there is also provided a user equipment including: a DC converter, the DC converter comprising: the power supply comprises a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit, a first filter capacitor, a second filter capacitor and an output filter unit; a first power conversion unit, a first end of which is connected with the first switching unit and a second end of which is connected with the second switching unit, for outputting a first voltage; a second power conversion unit, a first end of which is connected with the first switching unit and a second end of which is connected with the second switching unit, for outputting a second voltage; the first switching unit is connected with the second switching unit and is used for adjusting the voltage range of the total output voltage determined by the first voltage and the second voltage and determining that constant power is output in the voltage range; the first filter capacitor and the second filter capacitor are connected in series, the first filter capacitor and the second filter capacitor are connected in parallel to a first end of the first power conversion unit and a second end of the second power conversion unit, and a connection point between the first filter capacitor and the second filter capacitor is connected to a connection point between the first switching unit and the second switching unit; the first filter capacitor and the second filter capacitor are jointly used for carrying out voltage stabilization treatment on the total output voltage; and the output filtering unit is respectively connected with the first end of the first power conversion unit and the second end of the second power conversion unit and is used for outputting the total output voltage subjected to voltage stabilization processing.

According to a further embodiment of the present invention, there is also provided a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.

According to yet another embodiment of the present invention, there is also provided an electronic device, including a memory in which a computer program is stored and a processor configured to execute the computer program to perform the steps in any of the above method embodiments.

By using the first switching unit and the second switching unit in cooperation, the first voltage output by the first power conversion unit and the second voltage output by the second power conversion unit can meet the requirements of wide output voltage range and constant power output, that is, according to the range requirement of the output voltage, the combination (for example, series connection or parallel connection) of the first voltage and the second voltage is adjusted to meet the requirements of wide voltage range output and constant power output. Therefore, the problems of limited voltage range of output of the direct current converter, complex system structure and high cost provided by the related technology can be solved, and the effects of wide output voltage range and constant power output within the range can be achieved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic circuit diagram of a wide range output converter in accordance with one embodiment of the present invention;

FIG. 2 is a schematic circuit diagram of a wide range output converter in accordance with an alternate embodiment of the present invention;

FIG. 3 is a timing diagram for control of a compound switch according to an alternative embodiment of the present invention;

FIG. 4 is a schematic diagram of a circuit configuration of a wide range output converter in accordance with an exemplary embodiment of the first invention;

FIG. 5 is a timing diagram of the control switches of the switching circuit components in the converter based on the wide range output of FIG. 4;

fig. 6 is a schematic circuit configuration diagram of a wide-range output converter according to a second exemplary embodiment of the present invention;

fig. 7 is a schematic circuit configuration diagram of a wide-range output converter according to a third exemplary embodiment of the present invention;

fig. 8 is a circuit configuration diagram of a converter of a wide range output according to the fourth exemplary embodiment of the present invention;

fig. 9 is a circuit configuration diagram of a wide-range output converter according to an exemplary embodiment of the present invention;

fig. 10 is a circuit configuration diagram of a converter of a wide range output according to a sixth exemplary embodiment of the present invention;

fig. 11 is a circuit configuration diagram of a converter of a wide-range output according to a seventh exemplary embodiment of the present invention;

fig. 12 is a circuit configuration diagram of a converter of a wide range output according to an exemplary embodiment of the present invention;

fig. 13 is a circuit configuration diagram of a wide-range output converter according to an exemplary embodiment of the present invention;

fig. 14 is a circuit configuration diagram of a converter of a wide range output according to an exemplary embodiment of the present invention;

fig. 15 is a circuit configuration diagram of a wide-range output converter according to an eleventh exemplary embodiment of the present invention;

FIG. 16 is a circuit schematic of a wide range output converter in accordance with an exemplary embodiment twelve of the present invention;

fig. 17 is a flowchart of a control method of the dc converter according to an embodiment of the invention;

fig. 18 is a block diagram of a control device of the dc converter according to the embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Example 1

The method provided by the embodiment of the application can be used for changing the energy of the charging component of the electric automobile and the like which comprise the direct current converterAnd (4) changing the device to execute. Fig. 1 is a schematic circuit diagram of a wide-range output converter according to an embodiment of the present invention, and as shown in fig. 1, the circuit includes at least: a power conversion unit i (corresponding to a first power conversion unit) and a power conversion unit ii (corresponding to a second power conversion unit), a switching unit i (corresponding to a first switching unit) and a switching unit ii (corresponding to a second switching unit), and filter capacitors C1 (corresponding to a first filter capacitor) and C2 (corresponding to a second filter capacitor), and outputs the filter units. The power conversion units I and II output two independent voltage paths (equivalent to a first voltage and a second voltage) respectively of V_out1+And V_out1-，V_out2+And V_out2-. Output terminal V of power conversion unit I_out1+And V_out1-Respectively connected with the switching unit I and the switching unit II, and the output end V of the power conversion unit II_out2+And V_out2-And the switching units are respectively connected with the switching unit I and the switching unit II. One end of the switching unit I and V_out1+And the other end of the switching unit II is connected with the switching unit II. One end of the switching unit II and V_out2-And the other end of the switching unit I is connected with the switching unit I. The filter capacitors C1 and C2 are connected in series and then connected in parallel at V_out1+And V_out2-While the connection point of C1 and C2 is connected to the connection point of switch i and switch ii. The switching unit i is located between the filter capacitor C1 and the power conversion unit i. The switching unit II is located between the filter capacitor C2 and the power conversion unit II. V_out1+And V_out2-Are respectively connected with the output filter units as the total output voltage.

In an alternative embodiment, the power conversion unit includes, but is not limited to: the phase-shifting full bridge circuit, a Logic Link Control (LLC) resonance conversion circuit and a secondary side rectification circuit. The LLC resonant conversion circuit series topology comprises: common half-bridge type with diode clamped half-bridge type, full-bridge type. The secondary rectifier circuit can adopt at least a full-bridge rectifier circuit or a full-wave rectifier circuit.

In an alternative embodiment, the switching units i and ii are respectively formed by connecting two compound switches in series. Each compound switch has two

pins

1 and 2. Each compound switch is composed of two switching devices connected in parallel, wherein one switching device is a fast switching device (equivalent to the first switching device) with fast switching speed and good dynamic characteristics, and the fast switching device includes but is not limited to: the other is a slow switching device (equivalent to the second switching device) with slow switching speed and good steady-state characteristics, and includes but is not limited to: relays, and the like.

FIG. 2 is a schematic circuit diagram of a wide-range output converter according to an alternative embodiment of the present invention, as shown in FIG. 2, having two independent voltage outputs V_out1+And V_out1-，V_out2+And V_out2-. The two independent voltage outputs are obtained by two independent power conversion circuits. And C1 and C2 are connected in series to form an output filter capacitor of the total output. The switching units I and II are formed by connecting two compound switches in series. The switching unit i is formed by connecting a combination switch 1 (equivalent to a first combination switch) and a combination switch 2 (equivalent to a second combination switch) in series. The switching unit ii is formed by connecting a combination switch 3 (equivalent to a third combination switch) and a combination switch 4 (equivalent to a fourth combination switch) in series. 1 pin and V of combination switch 1_out1+The pin 2 of the compound switch 1 is connected with the pin 1 of the compound switch 2, the pin 2 of the compound switch 2 is connected with the pin 1 of the compound switch 3, V_out1-Connected to pin 2 of the compound switch 3. Pin 1 of the combination switch 3 is connected with pin 2 of the combination switch 2, pin 2 of the combination switch 3 is connected with pin 1 of the combination switch 4, pin 2 of the combination switch 4 is connected with V_out2-Are connected to each other by V_out2+Connected to pin 2 of the compound switch 3. The serial connection point of C1 and C2 is connected with the 2 pin of the compound switch 2, and the output filter unit is connected with the serial connection rear end of C1 and C2 and connected with Vout1+ and Vout 2-.

Fig. 3 is a timing diagram illustrating control of the compound switches according to an alternative embodiment of the present invention, where the fast switching device is turned on before the slow switching device and the slow switching device is turned off before the fast switching device in each compound switch, as shown in fig. 3. The fast switching devices in compound switch 1 and compound switch 4 are turned on and off simultaneously and the slow switching devices are turned on and off simultaneously. The fast switching devices in compound switch 2 and compound switch 3 are turned on and off simultaneously and the slow switching devices are turned on and off simultaneously.

The above implementation will be described in further detail in connection with a number of alternative exemplary embodiments below.

Example one

Fig. 4 is a schematic diagram of a circuit configuration of a wide-range output converter according to a first exemplary embodiment of the present invention, as shown in fig. 4, the converter is composed of the following parts: independent DC input source V_in，C_in1And C_in2Are two input capacitors of equal capacity. C_in1And C_in2Are connected in series. C_in1And C_in2After being connected in series with V_inAnd (4) connecting in parallel. C_in1And C_in2Each branch is connected with a half-bridge LLC resonant conversion circuit with a diode clamp. The secondary of each half-bridge LLC resonant circuit is connected with a full-wave rectifying circuit. The output ends of the two full-wave rectification circuits are respectively V_out1+And V_out1-，V_out2+And V_out2-. Transformer T₁And T₂The primary level of the resonant circuit is two paths of independently working half-bridge LLC resonant circuits. T is₁And T₂The secondary sides of the rectifier circuits are respectively connected with a full-wave rectifying circuit. Two half-bridge LLC resonant circuits respectively have resonant inductors L_r1And L_r2Primary winding L of transformer_m1And L_m2. Two N-channel MOSFET switching tubes VT1 and VT2 and relays K1 and K2 form a switching unit I. The source of the upper tube VT1 is connected with the drain of the lower tube VT2, the drain of the upper tube VT1 is connected with V_out1+And the source of the lower tube VT2 is connected with the drain of the VT3 in the switching unit II. Both ends of the relays K1 and K2 are connected to the drain and source of VT1 and VT2, respectively. Two N-channel MOSFET switching tubes VT3 and VT4 and relays K3 and K4 form a switching unit II. The source electrode of the upper tube VT3 is connected with the drain electrode of the lower tube VT4 in the switching unit II, the drain electrode of the upper tube VT3 of the switching unit II is connected with the source electrode of the VT2 in the switching unit I, and the source electrode of the lower tube VT4 is connected with V_out2-Are connected. Both ends of the relays K3 and K4 are connected to the drain and source of VT3 and VT4, respectively. The source of the upper tube VT1 of the switching unit I is connected with the drain of the lower VT2 and then connected with V_out2+Connecting; source of upper tube VT3 and drain of lower tube VT4 of switching unit IIIs then connected with V_out1-Are connected. The filter electrolytic capacitors C1 and C2 are connected in series, wherein the positive terminal of C1 is connected with V_out1+And the negative terminal of C1 is connected with the positive terminal of C2, the negative terminal of C2 is connected with Vout2-, and the negative terminal of C1 is connected with the positive terminal of C2 and then connected with the source of VT2 and the drain of VT 3. The switching unit I is connected with the filter electrolytic capacitor C1 in parallel and is located between the C1 and the rectification output end, and the switching unit II is connected with the filter electrolytic capacitor C2 in parallel and is located between the C2 and the rectification output end. V_out1+And V_out2-And the output voltage is respectively connected to the output filtering units and is output as the total output voltage after filtering.

FIG. 5 is a timing chart of control switches of each device of the switching circuit in the converter based on the wide-range output of FIG. 4. As shown in FIG. 5, it can be determined from the above connection relationship that when VT1 is turned on first, K1 is turned on in pull-in mode, VT4 is turned on in lead, K4 is turned on in pull-in mode, VT2 and VT3 are turned off, and K2 and K3 are turned off, V_out1+And V_out2+V connected together by VT1 and K1_out1-And V_out2-The two independent outputs are output as a parallel connection relation by being connected together through VT4 and K4. Meanwhile, the C1 and the C2 are connected in series to form a filter capacitor of the total output. When VT1 and VT4 are cut off and K1 and K4 are cut off, VT2 is firstly conducted, K2 is then attracted and conducted, VT3 is firstly conducted, K3 is then attracted and conducted, V is_out1-And V_out2+Connected together by conduction through VT2 and VT 3. The two independent outputs are used as the output in a series connection relationship, and meanwhile, the C1 and the C2 are connected in series and then used as a filter capacitor of the total output, so that the output voltage range can be enlarged and the low-voltage load capacity can be improved.

Example two

Fig. 6 is a schematic diagram of a circuit configuration of a wide-range output converter according to a second exemplary embodiment of the present invention, which is composed of the following parts as shown in fig. 6: independent DC input source V_in，C_in1And C_in2Are two input capacitors of equal capacity. C_in1And C_in2Are connected in series. C_in1And C_in2After being connected in series with V_inAnd (4) connecting in parallel. The difference from the embodiment shown in fig. 4 described above is that in this exemplary embodimentIn the examples, C_in1And C_in2The connected two independent input half-bridge LLC resonant circuits are common half-bridge LLC resonant conversion circuits without diode clamps. The secondary of each half-bridge LLC resonant circuit is connected with a full-wave rectifying circuit. The output ends of the two full-wave rectification circuits are respectively V_out1+And V_out1-，V_out2+And V_out2-. Transformer T₁And T₂The primary level of the resonant circuit is two paths of independently working half-bridge LLC resonant circuits. T is₁And T₂The secondary sides of the rectifier circuits are respectively connected with a full-wave rectifying circuit. Two half-bridge LLC resonant circuits respectively have resonant inductors L_r1And L_r2Primary winding L of transformer_m1And L_m2. Two N-channel MOSFET switching tubes VT1 and VT2 and relays K1 and K2 form a switching unit I. The source of the upper tube VT1 is connected with the drain of the lower tube VT2, the drain of the upper tube VT1 is connected with V_out1+And the source of the lower tube VT2 is connected with the drain of the VT3 in the switching unit II. Both ends of the relays K1 and K2 are connected to the drain and source of VT1 and VT2, respectively. Two N-channel MOSFET switching tubes VT3 and VT4 and relays K3 and K4 form a switching unit II. The source electrode of the upper tube VT3 is connected with the drain electrode of the lower tube VT4 in the switching unit II, the drain electrode of the upper tube VT3 of the switching unit II is connected with the source electrode of the VT2 in the switching unit I, and the source electrode of the lower tube VT4 is connected with V_out2-Are connected. Both ends of the relays K3 and K4 are connected to the drain and source of VT3 and VT4, respectively. The source of the upper tube VT1 of the switching unit I is connected with the drain of the lower VT2 and then connected with V_out2+Connecting; the source electrode of the upper tube VT3 of the switching unit II is connected with the drain electrode of the lower tube VT4 and then connected with V_out1-Are connected. The filter electrolytic capacitors C1 and C2 are connected in series, wherein the positive terminal of C1 is connected with V_out1+And the negative terminal of C1 is connected with the positive terminal of C2, the negative terminal of C2 is connected with Vout2-, and the negative terminal of C1 is connected with the positive terminal of C2 and then connected with the source of VT2 and the drain of VT 3. The switching unit I is connected with the filter electrolytic capacitor C1 in parallel and is located between the C1 and the rectification output end, and the switching unit II is connected with the filter electrolytic capacitor C2 in parallel and is located between the C2 and the rectification output end. V_out1+And V_out2-And the output voltage is respectively connected to the output filtering units and is output as the total output voltage after filtering.

EXAMPLE III

Fig. 7 is a schematic diagram of a circuit configuration of a wide-range output converter according to a third exemplary embodiment of the present invention, and as shown in fig. 7, the converter is composed of the following parts: independent DC input source V_in，C_in1And C_in2Are two input capacitors of equal capacity. C_in1And C_in2Are connected in series. C_in1And C_in2After being connected in series with V_inAnd (4) connecting in parallel. C_in1And C_in2Each branch is connected with a half-bridge LLC resonant conversion circuit with a diode clamp. The secondary of each half-bridge LLC resonant circuit is connected with a full-wave rectifying circuit. The output ends of the two full-wave rectification circuits are respectively V_out1+And V_out1-，V_out2+And V_out2-. Transformer T₁And T₂The primary level of the resonant circuit is two paths of independently working half-bridge LLC resonant circuits. The difference from the above-described embodiment shown in fig. 4 is that in this exemplary embodiment, the secondary sides of two independent transformers T1 and T2 are each connected to a full bridge synchronous rectification circuit. Two half-bridge LLC resonant circuits respectively have resonant inductors L_r1And L_r2Primary winding L of transformer_m1And L_m2. Two N-channel MOSFET switching tubes VT1 and VT2 and relays K1 and K2 form a switching unit I. The source of the upper tube VT1 is connected with the drain of the lower tube VT2, the drain of the upper tube VT1 is connected with V_out1+And the source of the lower tube VT2 is connected with the drain of the VT3 in the switching unit II. Both ends of the relays K1 and K2 are connected to the drain and source of VT1 and VT2, respectively. Two N-channel MOSFET switching tubes VT3 and VT4 and relays K3 and K4 form a switching unit II. The source electrode of the upper tube VT3 is connected with the drain electrode of the lower tube VT4 in the switching unit II, the drain electrode of the upper tube VT3 of the switching unit II is connected with the source electrode of the VT2 in the switching unit I, and the source electrode of the lower tube VT4 is connected with V_out2-Are connected. Both ends of the relays K3 and K4 are connected to the drain and source of VT3 and VT4, respectively. The source of the upper tube VT1 of the switching unit I is connected with the drain of the lower VT2 and then connected with V_out2+Connecting; the source electrode of the upper tube VT3 of the switching unit II is connected with the drain electrode of the lower tube VT4 and then connected with V_out1-Are connected. The filter electrolytic capacitors C1 and C2 are connected in series, wherein the positive terminal of C1 is connected withV_out1+And the negative terminal of C1 is connected with the positive terminal of C2, the negative terminal of C2 is connected with Vout2-, and the negative terminal of C1 is connected with the positive terminal of C2 and then connected with the source of VT2 and the drain of VT 3. The switching unit I is connected with the filter electrolytic capacitor C1 in parallel and is located between the C1 and the rectification output end, and the switching unit II is connected with the filter electrolytic capacitor C2 in parallel and is located between the C2 and the rectification output end. V_out1+And V_out2-And the output voltage is respectively connected to the output filtering units and is output as the total output voltage after filtering.

Example four

Fig. 8 is a schematic diagram of a circuit configuration of a wide-range output converter according to a fourth exemplary embodiment of the present invention, which is composed of the following parts as shown in fig. 8: independent DC input source V_in，C_in1And C_in2Are two input capacitors of equal capacity. C_in1And C_in2Are connected in series. C_in1And C_in2After being connected in series with V_inAnd (4) connecting in parallel. C_in1And C_in2The connected two independent input half-bridge LLC resonant circuits are common half-bridge LLC resonant conversion circuits without diode clamps. The secondary of each half-bridge LLC resonant circuit is connected with a full-wave rectifying circuit. The output ends of the two full-wave rectification circuits are respectively V_out1+And V_out1-，V_out2+And V_out2-. Transformer T₁And T₂The primary level of the resonant circuit is two paths of independently working half-bridge LLC resonant circuits. The difference from the embodiment shown in fig. 5 described above is that in this exemplary embodiment, the secondary of the transformers T1 and T2 is connected to a full bridge synchronous rectification circuit. Two half-bridge LLC resonant circuits respectively have resonant inductors L_r1And L_r2Primary winding L of transformer_m1And L_m2. Two N-channel MOSFET switching tubes VT1 and VT2 and relays K1 and K2 form a switching unit I. The source of the upper tube VT1 is connected with the drain of the lower tube VT2, the drain of the upper tube VT1 is connected with V_out1+And the source of the lower tube VT2 is connected with the drain of the VT3 in the switching unit II. Both ends of the relays K1 and K2 are connected to the drain and source of VT1 and VT2, respectively. Two N-channel MOSFET switching tubes VT3 and VT4 and relays K3 and K4 form a switching unit II. The source electrode of the upper tube VT3 is connected with the drain electrode of the lower tube VT4 in the switching unit II, the drain electrode of the upper tube VT3 of the switching unit II is connected with the source electrode of the VT2 in the switching unit I, and the source electrode of the lower tube VT4 is connected with V_out2-Are connected. Both ends of the relays K3 and K4 are connected to the drain and source of VT3 and VT4, respectively. The source of the upper tube VT1 of the switching unit I is connected with the drain of the lower VT2 and then connected with V_out2+Connecting; the source electrode of the upper tube VT3 of the switching unit II is connected with the drain electrode of the lower tube VT4 and then connected with V_out1-Are connected. The filter electrolytic capacitors C1 and C2 are connected in series, wherein the positive terminal of C1 is connected with V_out1+And the negative terminal of C1 is connected with the positive terminal of C2, the negative terminal of C2 is connected with Vout2-, and the negative terminal of C1 is connected with the positive terminal of C2 and then connected with the source of VT2 and the drain of VT 3. The switching unit I is connected with the filter electrolytic capacitor C1 in parallel and is located between the C1 and the rectification output end, and the switching unit II is connected with the filter electrolytic capacitor C2 in parallel and is located between the C2 and the rectification output end. V_out1+And V_out2-And the output voltage is respectively connected to the output filtering units and is output as the total output voltage after filtering.

EXAMPLE five

Fig. 9 is a schematic diagram of a circuit configuration of a wide-range output converter according to an exemplary embodiment of the present invention, and as shown in fig. 9, the converter is composed of the following parts: independent DC input source V_in，C_in1And C_in2Are two input capacitors of equal capacity. C_in1And C_in2Are connected in series. C_in1And C_in2After being connected in series with V_inAnd (4) connecting in parallel. The difference from the embodiment shown in fig. 4 described above is that, in this exemplary embodiment, C_in1And C_in2Each full-bridge LLC resonant conversion circuit is connected with one circuit. The secondary of each full-bridge LLC resonant circuit is connected with a full-wave rectification circuit. The output ends of the two full-wave rectification circuits are respectively V_out1+And V_out1-，V_out2+And V_out2-. Transformer T₁And T₂The primary level of the resonant circuit is a full-bridge LLC resonant circuit with two paths of independent work. T is₁And T₂The secondary sides of the rectifier circuits are respectively connected with a full-wave rectifying circuit. The two full-bridge LLC resonant circuits respectively have resonant inductors L_r1And L_r2Primary winding L of transformer_m1And L_m2. Two N-channel MOSFET switching tubes VT1 and VT2 and relays K1 and K2 form a switching unit I. The source of the upper tube VT1 is connected with the drain of the lower tube VT2, the drain of the upper tube VT1 is connected with V_out1+And the source of the lower tube VT2 is connected with the drain of the VT3 in the switching unit II. Both ends of the relays K1 and K2 are connected to the drain and source of VT1 and VT2, respectively. Two N-channel MOSFET switching tubes VT3 and VT4 and relays K3 and K4 form a switching unit II. The source electrode of the upper tube VT3 is connected with the drain electrode of the lower tube VT4 in the switching unit II, the drain electrode of the upper tube VT3 of the switching unit II is connected with the source electrode of the VT2 in the switching unit I, and the source electrode of the lower tube VT4 is connected with V_out2-Are connected. Both ends of the relays K3 and K4 are connected to the drain and source of VT3 and VT4, respectively. The source of the upper tube VT1 of the switching unit I is connected with the drain of the lower VT2 and then connected with V_out2+Connecting; the source electrode of the upper tube VT3 of the switching unit II is connected with the drain electrode of the lower tube VT4 and then connected with V_out1-Are connected. The filter electrolytic capacitors C1 and C2 are connected in series, wherein the positive terminal of C1 is connected with V_out1+And the negative terminal of C1 is connected with the positive terminal of C2, the negative terminal of C2 is connected with Vout2-, and the negative terminal of C1 is connected with the positive terminal of C2 and then connected with the source of VT2 and the drain of VT 3. The switching unit I is connected with the filter electrolytic capacitor C1 in parallel and is located between the C1 and the rectification output end, and the switching unit II is connected with the filter electrolytic capacitor C2 in parallel and is located between the C2 and the rectification output end. V_out1+And V_out2-And the output voltage is respectively connected to the output filtering units and is output as the total output voltage after filtering.

EXAMPLE six

Fig. 10 is a schematic diagram of a circuit configuration of a wide-range output converter according to a sixth exemplary embodiment of the present invention, and as shown in fig. 10, the converter is composed of the following parts: independent DC input source V_in，C_in1And C_in2Are two input capacitors of equal capacity. C_in1And C_in2Are connected in series. C_in1And C_in2After being connected in series with V_inAnd (4) connecting in parallel. C_in1And C_in2Each full-bridge LLC resonant conversion circuit is connected with one circuit. The secondary side of each full-bridge LLC resonant circuit is connected with full waveA rectifier circuit. The output ends of the two full-wave rectification circuits are respectively V_out1+And V_out1-，V_out2+And V_out2-. Transformer T₁And T₂The primary level of the resonant circuit is a full-bridge LLC resonant circuit with two paths of independent work. The difference from the embodiment shown in fig. 9 described above is that, in this exemplary embodiment, T₁And T₂The secondary of the synchronous rectification circuit is respectively connected with a full-bridge synchronous rectification circuit. The two full-bridge LLC resonant circuits respectively have resonant inductors L_r1And L_r2Primary winding L of transformer_m1And L_m2. Two N-channel MOSFET switching tubes VT1 and VT2 and relays K1 and K2 form a switching unit I. The source of the upper tube VT1 is connected with the drain of the lower tube VT2, the drain of the upper tube VT1 is connected with V_out1+And the source of the lower tube VT2 is connected with the drain of the VT3 in the switching unit II. Both ends of the relays K1 and K2 are connected to the drain and source of VT1 and VT2, respectively. Two N-channel MOSFET switching tubes VT3 and VT4 and relays K3 and K4 form a switching unit II. The source electrode of the upper tube VT3 is connected with the drain electrode of the lower tube VT4 in the switching unit II, the drain electrode of the upper tube VT3 of the switching unit II is connected with the source electrode of the VT2 in the switching unit I, and the source electrode of the lower tube VT4 is connected with V_out2-Are connected. Both ends of the relays K3 and K4 are connected to the drain and source of VT3 and VT4, respectively. The source of the upper tube VT1 of the switching unit I is connected with the drain of the lower VT2 and then connected with V_out2+Connecting; the source electrode of the upper tube VT3 of the switching unit II is connected with the drain electrode of the lower tube VT4 and then connected with V_out1-Are connected. The filter electrolytic capacitors C1 and C2 are connected in series, wherein the positive terminal of C1 is connected with V_out1+And the negative terminal of C1 is connected with the positive terminal of C2, the negative terminal of C2 is connected with Vout2-, and the negative terminal of C1 is connected with the positive terminal of C2 and then connected with the source of VT2 and the drain of VT 3. The switching unit I is connected with the filter electrolytic capacitor C1 in parallel and is located between the C1 and the rectification output end, and the switching unit II is connected with the filter electrolytic capacitor C2 in parallel and is located between the C2 and the rectification output end. V_out1+And V_out2-And the output voltage is respectively connected to the output filtering units and is output as the total output voltage after filtering.

EXAMPLE seven

FIG. 11 is a broad scope consistent with exemplary embodiment seven of the present inventionThe circuit schematic of the output converter, shown in FIG. 11, differs from the embodiment shown in FIG. 4 above in that in this exemplary embodiment the converter has 3 independent DC input sources V of equal magnitude_in1、V_in2、V_in3. Each path of input source is connected with a full-bridge LLC resonant conversion circuit, and each full-bridge LLC resonant circuit is respectively provided with a resonant inductor L_r1、L_r2、L_r3. Each full-bridge LLC resonant conversion circuit has two transformers with primary windings connected in series, which are T1, T2, T3, T4, T5, and T6, respectively. Each primary winding of the transformer is L_m1、L_m2、L_m3、L_m4、L_m5、L_m6Wherein L is_m1And L_m2In series, L_m3And L_m4In series, L_m5And L_m6In series, L_m1、L_m3、L_m5The corresponding secondary winding of the transformer is connected with the secondary winding of the transformer in a Y shape and then connected with a diode bridge rectifier circuit to generate output voltage V_out1+And V_out1-. Same L_m2、L_m4The secondary windings of the transformer corresponding to the Lm6 are connected in a Y shape on the secondary side of the transformer and then connected with a diode bridge rectifier circuit to generate an output voltage V_out2+And V_out2-。

Example eight

Fig. 12 is a schematic circuit configuration diagram of a converter of a wide-range output according to an exemplary embodiment eight of the present invention, and as shown in fig. 12, the difference from the above-described embodiment shown in fig. 4 is that, in this exemplary embodiment, VT1 and VT4 in the switching circuit are replaced by diodes VD1 and VD2, respectively. When VT2 and VT3 are not conducting, the outputs are in a parallel state; when the VT2 and the VT3 are conducted, the diodes VD1 and VD2 are reversely cut off, and the output is in a series state.

Example nine

Fig. 13 is a schematic circuit configuration diagram of a wide-range output converter according to an exemplary embodiment nine of the present invention, and as shown in fig. 13, the difference from the above-described embodiment shown in fig. 4 is that, in this exemplary embodiment, VT1 and VT4 in the switching circuit are replaced by diodes VD1 and VD2, respectively, and VD1 and VD2 operate independently without respective parallel relays. When VT2 and VT3 are not conducting, the outputs are in a parallel state; when the VT2 and the VT3 are conducted, the diodes VD1 and VD2 are reversely cut off, and the output is in a series state.

Example ten

Fig. 14 is a schematic circuit configuration diagram of a wide-range output converter according to an exemplary embodiment of the present invention, and as shown in fig. 14, the difference from the above-described embodiment shown in fig. 4 is that, in this exemplary embodiment, VT1 and VT4 in the switching circuit are replaced by diodes VD1 and VD2, respectively, and VD1 and VD2 operate independently, and there are no respective parallel relays, while the relays K2 and K3 connected in parallel with VT2 and VT3 are removed, and instead, V is replaced by V2 and VT3_out2+And V_out1-A relay K2 is added in between. The control timing of this relay K2 is the same as that of K2 in the embodiment shown in fig. 4. When VT2 and VT3 are not conducting, the outputs are in a parallel state; when the VT2 and the VT3 are conducted, the diodes VD1 and VD2 are reversely cut off, and the output is in a series state.

In another optional embodiment of the present invention, unlike the exemplary embodiment in which a high-frequency rectification circuit is used for outputting a stable dc output voltage after filtering processing is performed by using a filter capacitor, the power conversion unit i and the power conversion unit ii may be respectively powered by using storage batteries, and at this time, the storage batteries themselves may output a stable dc voltage, so that the filter capacitor may not be used.

This will be explained below in connection with two alternative exemplary embodiments.

EXAMPLE eleven

Fig. 15 is a schematic circuit configuration diagram of a wide-range output converter according to an eleventh exemplary embodiment of the present invention, and as shown in fig. 15, differs from the above-described embodiment shown in fig. 14 in that V is set in this exemplary embodiment_out1+And V_out1-Is powered by a storage battery V_DC1Providing a reaction of V_out2+And V_out2-Is powered by a storage battery V_DC2Provided is a method. Because the power is supplied by the storage battery, the output is cancelledFilter capacitors C1 and C2.

Example twelve

Fig. 16 is a schematic circuit diagram of a wide-range output converter according to a twelfth exemplary embodiment of the present invention, and as shown in fig. 16, the difference from the above-described embodiment shown in fig. 15 is that in this exemplary embodiment, two series switches VT2 and VT3 are combined, and one VT2 is used instead, so that not only can devices be saved and hardware cost be reduced, but also the same design purpose can be achieved.

In the present embodiment, a control method of a dc converter operated in the energy conversion device is provided, and fig. 17 is a flowchart of the control method of the dc converter according to the embodiment of the present invention, as shown in fig. 17, the flowchart includes the following steps:

step S12, acquiring a first voltage and a second voltage;

step S14 of adjusting a voltage range of a total output voltage determined by the first voltage and the second voltage and determining that constant power is output within the voltage range;

step S16, voltage stabilization processing is carried out on the total output voltage;

in step S18, the total output voltage subjected to the voltage stabilization processing is output.

Through the steps, the problems of limited output voltage range, complex system structure and high cost of the direct current converter provided by the related technology are solved, and the effects of wide output voltage range and constant power output within the range are achieved.

Alternatively, the main body of the above steps may be a processor or the like in the energy conversion device, but is not limited thereto.

In an alternative embodiment, the dc converter comprises: first switching unit, second switching unit, first switching unit includes: first combination switch and second combination switch, the second switching unit includes: a third compound switch and a fourth compound switch, each compound switch comprising: the first switching device and the second switching device, wherein the first switching device is closed before the second switching device and the first switching device is opened later than the second switching device, adjusting the voltage range of the total output voltage and determining to output the constant power within the voltage range in step S14 may include performing the steps of:

step S141, controlling the first switch devices in the first compound switch and the fourth compound switch to be simultaneously conducted so as to enable the first voltage and the second voltage to be output in parallel, and obtaining a first partial voltage range of the total output voltage;

step S142, controlling the first switch devices in the second compound switch and the third compound switch to be turned on simultaneously, so that the first voltage and the second voltage are output in series, and obtaining a second partial voltage range of the total output voltage;

step S143, adjusting a voltage range of the total output voltage using the first partial voltage range and the second partial voltage range and determining to output a constant power within the voltage range.

When the fast switching devices in compound switch 1 and compound switch 4 are turned on simultaneously, compound switch 2 and compound switch 3 are in the off state at this time. V_out2+By means of combination of switches 1 and V_out1+Are connected to each other by V_out2-By combining switches 4 and V_out1-Are connected. The two independent outputs are output as a parallel connection relation, meanwhile, the C1 and the C2 are connected in series to be used as a filter capacitor of the total output, at the moment, the total output voltage is equal to each independent output voltage, and the output current of the total output is 2 times of the output current of each independent voltage. This case is suitable for use in a low-voltage and large-current output situation. In addition, when the fast switching devices in the compound switch 2 and the compound switch 3 are turned on simultaneously, the compound switch 1 and the compound switch 4 are in an off state, V_out2+By means of a combination switch 2 and a combination switch 3 with V_out1-Are connected. The two independent outputs are output as a series connection relation, meanwhile, the C1 and the C2 are connected in series to serve as a filter capacitor of a total output, at the moment, the total output voltage is 2 times of each independent output voltage, the output current of the total output is equal to the output current of each independent voltage, and the high-voltage high-power-output filter is suitable for being used under the condition of high voltage.

The reason for the combined use of the fast and slow switching devices is that: generally, the fast switching device has good dynamic characteristics, but has poor steady-state characteristics, and has large on-resistance, and when a large output current flows through the body of the fast switching device, the on-resistance causes large loss and serious heat generation, so that a large radiator is needed for heat dissipation; in addition, when a fast switching device with large current capacity is selected, the price of the device is high, and the cost is high, so that the loss generated after the fast switching device is conducted can be reduced by adding the slow switching devices connected in parallel at two ends of the fast switching device, and the slow switching device is poor in dynamic characteristic, strong in steady-state current capacity, small in conducting impedance and low in price. The reduction in losses results in a smaller corresponding heat sink, a smaller overall device size, and an increased power density.

In the aspect of control, a common slow switching device is a mechanical switching device controlled by an electromagnetic mechanical device, and the withstand voltage required at two ends of a contact of the mechanical switching device is not very high, so that the common slow switching device cannot be directly used as a change-over switch in a high-voltage occasion, and the slow switching device needs to be turned on after a short time delay is carried out after a fast switching device with high withstand voltage is turned on, and then the voltage at two ends of the slow switching device is reduced to be within an allowable working range. And similarly, when the fast switching device is required to be disconnected, the slow switching device is disconnected in advance according to the state instruction, and the fast switching device is disconnected after a short delay.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

Example 2

In this embodiment, a control device of a dc converter is also provided, and the control device is used to implement the above embodiments and preferred embodiments, which have already been described and will not be described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 18 is a block diagram showing a configuration of a control apparatus of a dc converter according to an embodiment of the present invention, as shown in fig. 18, the apparatus including: an obtaining module 10, configured to obtain a first voltage and a second voltage; an adjusting module 20 for adjusting a voltage range of a total output voltage determined by the first voltage and the second voltage and determining to output a constant power within the voltage range; the processing module 30 is used for performing voltage stabilization processing on the total output voltage; and the output module 40 is used for outputting the total output voltage subjected to voltage stabilization.

In an alternative embodiment, the dc converter comprises: first switching unit, second switching unit, first switching unit includes: first combination switch and second combination switch, the second switching unit includes: a third compound switch and a fourth compound switch, each compound switch comprising: a first switching device and a second switching device, wherein the first switching device is closed before the second switching device and the first switching device is opened later than the second switching device, the adjustment module 20 comprising: a first control unit (not shown in the figure) for controlling the first switching devices in the first combination switch and the fourth combination switch to be turned on simultaneously, so that the first voltage and the second voltage are output in parallel to obtain a first partial voltage range of the total output voltage; a second control unit (not shown in the figure) for controlling the first switching devices in the second combination switch and the third combination switch to be turned on simultaneously, so that the first voltage and the second voltage are output in series to obtain a second partial voltage range of the total output voltage; and an adjusting unit (not shown in the figure) for adjusting a voltage range of the total output voltage using the first partial voltage range and the second partial voltage range and determining to output a constant power within the voltage range.

It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.

Example 3

Embodiments of the present invention also provide a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.

Alternatively, in the present embodiment, the storage medium may be configured to store a computer program for executing the steps of:

s1, acquiring a first voltage and a second voltage;

s2, adjusting the voltage range of the total output voltage determined by the first voltage and the second voltage and determining that constant power is output in the voltage range;

s3, stabilizing the total output voltage;

and S4, outputting the regulated total output voltage.

Optionally, the storage medium is further arranged to store a computer program for performing the steps of:

s1, controlling the first switch devices in the first compound switch and the fourth compound switch to be simultaneously conducted, so that the first voltage and the second voltage are output in parallel, and obtaining a first partial voltage range of the total output voltage;

s2, controlling the first switch devices in the second compound switch and the third compound switch to be conducted simultaneously, so that the first voltage and the second voltage are output in series, and a second partial voltage range of the total output voltage is obtained;

and S3, adjusting the voltage range of the total output voltage by using the first partial voltage range and the second partial voltage range and determining that constant power is output in the voltage range.

Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.

Example 4

Embodiments of the present invention also provide an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the steps of any of the above method embodiments.

Optionally, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.

Optionally, in this embodiment, the processor may be configured to execute the following steps by a computer program:

s1, acquiring a first voltage and a second voltage;

s3, stabilizing the total output voltage;

and S4, outputting the regulated total output voltage.

Optionally, in this embodiment, the processor may be further configured to execute, by the computer program, the following steps:

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dc converter, comprising: the power supply comprises a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit, a first filter capacitor, a second filter capacitor and an output filter unit;

the first power conversion unit is connected with the first switching unit at a first end and connected with the second switching unit at a second end, and is used for outputting a first voltage;

the first end of the second power conversion unit is connected with the first switching unit, and the second end of the second power conversion unit is connected with the second switching unit, so that a second voltage is output;

the first switching unit is connected with the second switching unit and is used for adjusting the voltage range of the total output voltage determined by the first voltage and the second voltage and determining that constant power is output in the voltage range;

the first filter capacitor and the second filter capacitor are connected in series, the first filter capacitor and the second filter capacitor are connected in parallel to a first end of the first power conversion unit and a second end of the second power conversion unit, and a connection point between the first filter capacitor and the second filter capacitor is connected to a connection point between the first switching unit and the second switching unit; the first filter capacitor and the second filter capacitor are jointly used for carrying out voltage stabilization treatment on the total output voltage;

and the output filtering unit is respectively connected with the first end of the first power conversion unit and the second end of the second power conversion unit and is used for outputting the total output voltage subjected to voltage stabilization processing.

2. The dc converter of claim 1, wherein the first power conversion unit or the second power conversion unit comprises one of: the phase-shifted full-bridge circuit, the resonance conversion circuit and the secondary side rectifying circuit.

3. The dc converter according to claim 1, wherein the first switching unit comprises: a first compound switch and a second compound switch, the second switching unit including: a third compound switch and a fourth compound switch, wherein,

a first end of the first combination switch is connected with a first end of the first power conversion unit, and a second end of the first combination switch is connected with a first end of the second combination switch; the second end of the second compound switch is connected with the first end of the third compound switch; the second end of the third compound switch is connected with the first end of the fourth compound switch; and the second end of the fourth compound switch is connected with the second end of the second power conversion unit.

4. The dc converter of claim 3, wherein the first compound switch, the second compound switch, the third compound switch, and the fourth compound switch each comprise: a first switching device and a second switching device, wherein the first switching device is closed before the second switching device and the first switching device is opened later than the second switching device.

5. The DC converter of claim 4, wherein the first compound switch is turned on and off simultaneously with the first switching device in the fourth compound switch, and the first compound switch is turned on and off simultaneously with the second switching device in the fourth compound switch.

6. The DC converter of claim 4, wherein the second compound switch is turned on and off simultaneously with the first switching device in the third compound switch, and the second compound switch is turned on and off simultaneously with the second switching device in the third compound switch.

7. A dc converter, comprising: the power conversion device comprises a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit and an output filtering unit;

the first switching unit is connected with the second switching unit and is used for adjusting the voltage range of the total output voltage determined by the first voltage and the second voltage and outputting constant power in the voltage range together with the second switching unit;

8. A method of controlling a dc converter, comprising:

acquiring a first voltage and a second voltage;

adjusting a voltage range of a total output voltage determined by the first voltage and the second voltage and determining to output a constant power within the voltage range;

performing voltage stabilization treatment on the total output voltage;

and outputting the total output voltage subjected to voltage stabilization.

9. The method of claim 8, wherein the dc converter comprises: a first switching unit, a second switching unit, the first switching unit comprising: a first compound switch and a second compound switch, the second switching unit including: a third compound switch and a fourth compound switch, each compound switch comprising: a first switching device and a second switching device, wherein the first switching device is closed before the second switching device and the first switching device is opened later than the second switching device, adjusting a voltage range of the total output voltage and determining to output a constant power within the voltage range comprises:

controlling the first switch devices in the first compound switch and the fourth compound switch to be turned on simultaneously, so that the first voltage and the second voltage are output in parallel, and a first partial voltage range of the total output voltage is obtained;

controlling the first switching devices in the second compound switch and the third compound switch to be turned on simultaneously, so that the first voltage and the second voltage are output in series to obtain a second partial voltage range of the total output voltage;

adjusting a voltage range of the total output voltage using the first partial voltage range and the second partial voltage range and determining to output a constant power within the voltage range.

10. A control device for a dc converter, comprising:

the acquisition module is used for acquiring a first voltage and a second voltage;

an adjustment module for adjusting a voltage range of a total output voltage determined by the first voltage and the second voltage and determining that constant power is output within the voltage range;

the processing module is used for carrying out voltage stabilization processing on the total output voltage;

and the output module is used for outputting the total output voltage subjected to voltage stabilization.

11. The apparatus of claim 10, wherein the dc converter comprises: a first switching unit, a second switching unit, the first switching unit comprising: a first compound switch and a second compound switch, the second switching unit including: a third compound switch and a fourth compound switch, each compound switch comprising: a first switching device and a second switching device, wherein the first switching device is closed before the second switching device and the first switching device is opened later than the second switching device, the adjustment module comprising:

the first control unit is used for controlling the first switch devices in the first compound switch and the fourth compound switch to be simultaneously conducted so that the first voltage and the second voltage are output in parallel to obtain a first partial voltage range of the total output voltage;

the second control unit is used for controlling the first switch devices in the second compound switch and the third compound switch to be simultaneously conducted so as to enable the first voltage and the second voltage to be output in series and obtain a second partial voltage range of the total output voltage;

an adjusting unit for adjusting a voltage range of the total output voltage using the first partial voltage range and the second partial voltage range and determining to output a constant power within the voltage range.

12. A user device, comprising: a DC converter, the DC converter comprising: the power supply comprises a first power conversion unit, a second power conversion unit, a first switching unit, a second switching unit, a first filter capacitor, a second filter capacitor and an output filter unit;

13. A storage medium, in which a computer program is stored, wherein the computer program is arranged to perform the method of any of claims 8 to 9 when executed.

14. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to perform the method of any of claims 8 to 9.