WO2020125343A1 - 一种dc/dc变换电路 - Google Patents

一种dc/dc变换电路 Download PDF

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Publication number
WO2020125343A1
WO2020125343A1 PCT/CN2019/121009 CN2019121009W WO2020125343A1 WO 2020125343 A1 WO2020125343 A1 WO 2020125343A1 CN 2019121009 W CN2019121009 W CN 2019121009W WO 2020125343 A1 WO2020125343 A1 WO 2020125343A1
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WO
WIPO (PCT)
Prior art keywords
circuit
external power
power supply
switch
input terminal
Prior art date
Application number
PCT/CN2019/121009
Other languages
English (en)
French (fr)
Inventor
高拥兵
王均
石磊
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP19897945.2A priority Critical patent/EP3883080A4/en
Publication of WO2020125343A1 publication Critical patent/WO2020125343A1/zh
Priority to US17/350,191 priority patent/US11811315B2/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
    • H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits

Definitions

  • This application relates to the field of power electronics technology, and in particular to a DC/DC conversion circuit.
  • a DC-DC converter circuit (referred to as a DC/DC circuit for short) is a circuit that boosts or reduces DC. Its input and output are DC. DC/DC circuits are widely used in energy storage, electric vehicles, new energy, power systems, electronic computers and other fields.
  • Boost power conversion circuit as an example, as shown in Figure 1, after the input power Udc is reversed, the parasitic diode D1 of the switching tube T (IGBT or MOSFET) and the power inductor L are short-circuited, because the parasitic diode D1 of the switching device usually flows The ability is small, and the large short-circuit current will cause the switching device to burn out.
  • the existing technology is to connect a Si diode D3 with a large current passing capacity in parallel to the power switch tube T. As shown in the figure below, when the input power is reversely connected, a short-circuit current passes through the protection diode D3. The tube plays a protective role.
  • a Si diode D3 with a large current passing capacity is connected in parallel to the power switch tube T, which protects the power switch tube.
  • the junction capacitance is connected in parallel on both sides of the switch tube, which effectively increases the junction capacitance of the switch tube, thereby slowing down the switching speed of the power device.
  • Boost is a hard switching circuit, the slower switching speed increases the switching losses of the power tube and reduces the circuit efficiency.
  • An embodiment of the present application provides a DC/DC conversion circuit by providing a switch between an input end of the DC/DC conversion circuit and a power circuit of the DC/DC conversion circuit, and between the switch and the Diodes are placed between the power circuits to solve the problem of large circuit losses in the case of the reverse connection of the input terminal of the DC/DC conversion circuit and the external power supply in the prior art, to achieve the reduction of the DC/DC under the reverse connection of the input terminal and the external power supply DC conversion circuit loss.
  • an embodiment of the present application provides a DC/DC conversion circuit, which includes an input terminal, a power circuit, and an output terminal, and further includes a bypass circuit, where the bypass circuit is a unidirectional conduction circuit;
  • a switch S is provided between the input terminal and the power circuit, and the input terminal is used to connect with one or more external power supplies; wherein the external power supply is used to supply power to the DC/DC conversion circuit;
  • the bypass circuit is connected between the input terminal and the power circuit, and the bypass circuit is disposed between the switch S and the power circuit, wherein the bypass circuit and the power Circuits in parallel;
  • the switch S is used to close when the input terminal is reversely connected to the external power source, so that the current output from the positive pole of the external power source flows through the bypass circuit and the switch S, and flows back to the The negative pole of the external power supply.
  • a photovoltaic inverter provided by an embodiment of the present application includes the above-mentioned DC/DC conversion circuit, which is provided between the input end of the DC/DC conversion circuit and the power circuit of the DC/DC conversion circuit There is a switch, and a bypass circuit is provided between the switch and the power circuit, wherein the bypass circuit is a unidirectional conduction circuit, which solves the problem that the input end of the DC/DC conversion circuit in the prior art is inverse to the external power supply
  • the problem of large circuit loss in the case of connection is used to reduce the loss of the DC/DC conversion circuit when the input terminal is connected to the external power supply in reverse.
  • the DC/DC conversion circuit further includes a controller, the controller is connected to the switch S, and the controller is used to detect the current or voltage at the output end of the external power supply to Determine whether the input terminal is reversely connected to the external power supply;
  • the controller is also used to control the switch S to open when it is determined that the input terminal is reversely connected to the external power supply.
  • the positive and negative poles of the output end of the external power supply can be determined, thereby determining the external power supply and Whether the input end of the DC/DC conversion circuit is reversed.
  • the bypass circuit of the DC/DC converter circuit includes a diode D, wherein the reverse connection of the external power supply includes an anode of the diode D connected to a positive electrode of the external power supply situation.
  • the bypass circuit is a unidirectional conduction circuit.
  • the reverse connection of the external power supply includes that the anode of the diode D is connected to the anode of the external power supply via the switch S.
  • the anode of the diode D When the input terminal is directly connected to the external power supply, the anode of the diode D is connected to the negative electrode of the external power supply, or the anode of the diode D is connected to the negative electrode of the external power supply via the switch S .
  • the switch S is also used to close when the input terminal is positively connected to the external power source, so that the current output by the external power source flows back to the negative electrode of the external power source through the switch S and the power circuit.
  • the power circuit includes forward boost, or reverse boost, or buck-boost, or Cuk, or Sepic, or Zeta or bidirectional buck/boost circuit.
  • the switch S includes a relay, a contactor, a semiconductor bidirectional switch, or a mechanical switch.
  • an embodiment of the present application provides a method for controlling a DC/DC conversion circuit.
  • the DC/DC conversion circuit includes an input terminal, a power circuit and an output terminal, and further includes a bypass circuit, wherein the bypass circuit It is a unidirectional circuit; a switch S is provided between the input terminal and the power circuit, and the input terminal is used to connect with an external power supply; wherein, the external power supply is used to supply power to the DC/DC conversion circuit ;
  • the bypass circuit is connected between the input terminal and the power circuit, and the diode is disposed between the switch S and the power circuit, wherein the bypass circuit and the power circuit Parallel; the method includes:
  • a photovoltaic inverter provided by an embodiment of the present application includes the above-mentioned DC/DC conversion circuit, which is provided between the input end of the DC/DC conversion circuit and the power circuit of the DC/DC conversion circuit There is a switch, and a bypass circuit is provided between the switch and the power circuit, wherein the bypass circuit is a unidirectional conduction circuit, which solves the problem that the input end of the DC/DC conversion circuit in the prior art is inverse to the external power supply
  • the problem of large circuit loss in the case of connection is used to reduce the loss of the DC/DC conversion circuit when the input terminal is connected to the external power supply in reverse.
  • the DC/DC conversion circuit further includes a controller, the controller is connected to the switch S, and the input terminal of the control switch S is reversely connected to the external power supply
  • closure includes:
  • the controller detects the current or voltage at the output end of the external power supply to determine whether the input end is reversely connected to the external power supply;
  • the controller controls the switch S to close when it is determined that the input terminal is reversely connected to the external power source.
  • the positive and negative poles of the output end of the external power supply can be determined, thereby determining the external power supply and Whether the input end of the DC/DC conversion circuit is reversed.
  • the bypass circuit of the DC/DC conversion circuit includes a diode D, and the control switch S is closed when the input terminal is reversely connected to the external power supply, so that all The current output by the positive pole of the external power source flows through the bypass circuit and the switch S, and flows back to the negative pole of the external power source, including:
  • the bypass circuit is a unidirectional conduction circuit.
  • the method when it is determined that the external power supply is reversely connected to the input terminal, the current output from the positive electrode of the external power supply flows through the diode and the switch S to flow back to the external After the negative pole of the power supply, the method further includes:
  • the switch S is controlled to be turned off to disconnect the external power supply from other circuit elements of the DC/DC conversion circuit.
  • the current or voltage at the output end of the input power supply is detected to determine whether the input power supply is reversely connected, wherein the reverse connection of the input power supply includes the anode of the diode D and the input
  • the method further includes:
  • the reverse connection of the input power supply includes that the anode of the diode D is connected to the negative electrode of the input power via the switch S.
  • an embodiment of the present application provides a photovoltaic inverter, including a DC/DC conversion circuit, a DC/AC inverter circuit, and a filter circuit.
  • the DC/DC conversion circuit includes an input terminal, and a power circuit and The output terminal also includes diode D;
  • a switch S is provided between the input terminal and the power circuit, and the input terminal is used to connect with an external power supply; wherein, the external power supply is used to supply power to the DC/DC conversion circuit;
  • the diode D is connected between the input terminal and the power circuit, and the diode is disposed between the switch S and the power circuit, wherein the diode D is connected in parallel with the power circuit;
  • the switch S When the input terminal is reversely connected to the external power supply, the switch S is closed, and the current output from the positive electrode of the external power supply flows through the diode and the switch S and flows back to the negative electrode of the external power supply.
  • the reverse connection of the external power supply includes a case where the anode of the diode D is connected to the anode of the external power supply.
  • a photovoltaic inverter provided by an embodiment of the present application includes the above DC/DC conversion circuit, and a switch is provided between the input end of the DC/DC conversion circuit and the power circuit of the DC/DC conversion circuit, And a diode is provided between the switch and the power circuit, which solves the problem of large circuit loss when the input terminal of the DC/DC conversion circuit and the external power supply are reversely connected in the prior art, and is used to realize that the input terminal and the external Reduce the loss of the DC/DC converter circuit when the power supply is reversed.
  • the DC/DC conversion circuit further includes a controller, and the controller is configured to detect a current or voltage at an output end of the external power supply to determine the input Whether the terminal is connected to the external power supply in reverse;
  • the controller is also used to control the switch S to close when it is determined that the input terminal is reversely connected to the external power source.
  • the DC/DC conversion circuit further includes a controller, and the controller is configured to determine that the input terminal is reversely connected to the external power supply To control the switch S to open.
  • the anode of the diode D when the input terminal is reversely connected to the external power supply, the anode of the diode D is connected to the anode of the external power supply, or The anode of the diode D is connected to the anode of the external power supply via the switch S.
  • an embodiment of the present application provides a communication system, including a communication device and a communication power supply.
  • the communication power supply is used to supply power to the communication device.
  • the power supply includes a DC/DC conversion circuit.
  • the DC/DC conversion circuit includes an input terminal, a power circuit, and an output terminal, and is further characterized by a bypass circuit, wherein the bypass circuit is a unidirectional conduction circuit;
  • a switch S is provided between the input terminal and the power circuit, and the input terminal is used to connect with one or more external power supplies; wherein the external power supply is used to supply power to the DC/DC conversion circuit;
  • the bypass circuit is connected between the input terminal and the power circuit, and the bypass circuit is disposed between the switch S and the power circuit, wherein the bypass circuit and the power Circuits in parallel;
  • the switch S is used to close when the input terminal is reversely connected to the external power source, so that the current output from the positive pole of the external power source flows through the bypass circuit and the switch S, and flows back to the The negative pole of the external power supply.
  • the bypass circuit of the DC/DC conversion circuit includes a diode D, wherein the reverse connection of the external power supply includes an anode of the diode D and the external power supply Connected to the positive pole.
  • a communication system provided by an embodiment of the present application includes a communication device and a communication power supply.
  • the communication power supply is used to supply power to the communication device.
  • the power supply includes a DC/DC conversion circuit, including the DC/DC conversion circuit described above.
  • FIG. 1 is a schematic structural diagram of a DC/DC conversion circuit provided by the prior art
  • FIG. 2 is a schematic structural diagram of a DC/DC conversion circuit provided by the prior art
  • FIG. 3 is a schematic structural diagram of a DC/DC conversion circuit provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of another DC/DC conversion circuit provided by an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of another DC/DC conversion circuit provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of another DC/DC conversion circuit provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of another DC/DC conversion circuit provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of another DC/DC conversion circuit provided by an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of another DC/DC conversion circuit provided by an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of another DC/DC conversion circuit provided by an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of another DC/DC conversion circuit provided by an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of another DC/DC conversion circuit provided by an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of another DC/DC conversion circuit provided by an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of another DC/DC conversion circuit provided by an embodiment of the present application.
  • 16 is a schematic structural diagram of a photovoltaic inverter provided by an embodiment of the present application.
  • An embodiment of the present application provides a DC/DC conversion circuit by providing a switch between an input end of the DC/DC conversion circuit and a power circuit of the DC/DC conversion circuit, and between the switch and the A bypass circuit is provided between the power circuits.
  • the bypass circuit is a unidirectional conduction circuit.
  • the bypass circuit includes a diode, which solves the circuit loss in the case where the input terminal of the DC/DC conversion circuit is reversely connected to the external power supply in the prior art.
  • a big problem is to reduce the loss of the DC/DC converter circuit when the input terminal is connected to the external power supply in reverse.
  • FIG. 3 a schematic structural diagram of a DC/DC conversion circuit is provided for an embodiment of the present application.
  • An application scenario of the conversion circuit is that an external power supply supplies power to the DC/DC conversion circuit, and the DC/DC conversion circuit pair The voltage output from the external power supply is adjusted and converted.
  • the external power source includes but is not limited to a photovoltaic panel power supply method, or includes other types of power sources.
  • the DC/DC conversion circuit includes an input terminal, an output terminal, a power circuit and a bypass circuit, a switch S is further provided between the input terminal and the power circuit, and the input terminal is used to External power connection;
  • the bypass circuit When the input terminal is directly connected to the external power supply, the bypass circuit is not turned on and does not work.
  • the bypass circuit has unidirectional conductivity.
  • the external power supply is used to power the DC/DC conversion circuit.
  • the external power source includes but is not limited to a photovoltaic panel power supply method, or other types of power sources. In a possible implementation manner of the embodiment of the present application, in the case that there are multiple external power sources, the multiple external power sources are arranged in parallel to increase the power The input current of the circuit.
  • FIG. 4 a schematic structural diagram of a DC/DC conversion circuit is provided for an embodiment of this application.
  • the DC/DC conversion circuit includes an input terminal, a power circuit and an output terminal, and a bypass circuit, and the bypass circuit includes a diode D;
  • a switch S is provided between the input terminal and the power circuit, and the input terminal is used to connect with an external power supply; wherein, the external power supply is used to power the DC/DC conversion circuit; the external power supply includes But it is not limited to photovoltaic panel power supply, or other types of power supply.
  • the diode D is connected between the input terminal and the power circuit, and the diode is disposed between the switch S and the power circuit, wherein the diode D is connected in parallel with the power circuit;
  • the diode D is arranged between the switch S and the power circuit, and the diode D is arranged in parallel with the power circuit, for inverting the input terminal and the external power supply
  • the current output by the external power supply forms a closed loop through the diode D and the switch S, thereby isolating the power circuit, reducing the loss of the power circuit, and reducing the reverse connection of the external power supply
  • the switch S When the input terminal is reversely connected to the external power supply, the switch S is closed, and the current output from the positive electrode of the external power supply flows through the diode and the switch S and flows back to the negative electrode of the external power supply.
  • the reverse connection of the external power supply includes a case where the anode of the diode D is connected to the anode of the external power supply.
  • the input terminal is positively connected to the external power supply, the anode of the diode D is connected to the negative electrode of the external power supply, or the anode of the diode D is connected to the anode via the switch S Connect the negative pole of the external power supply.
  • the external circuit normally powers the DC/DC power circuit.
  • An embodiment of the present application provides a DC/DC conversion circuit by providing a switch between the input end of the DC/DC conversion circuit and the power circuit of the DC/DC conversion circuit, and the switch The diode is arranged between the power circuit and the power circuit, which solves the problem of large circuit loss in the case where the input terminal of the DC/DC converter circuit is reversely connected to the external power supply in order to achieve the reverse connection of the input terminal and the external power supply Reduce DC/DC conversion circuit losses.
  • the anode of the diode D is connected to all The anode of the external power supply is connected, or the anode of the diode D is connected to the anode of the external power supply via the switch S.
  • the external power supply forms a loop with the diode D, thereby bypassing the power circuit.
  • the anode of the diode D and the The negative electrode of the external power supply is connected, or the anode of the diode D is connected to the negative electrode of the external power supply via the switch S.
  • the DC/DC conversion circuit operates normally, and the external power supply normally supplies power to the power circuit of the DC/DC conversion electrical circuit.
  • the switch S in the case that the DC/DC conversion circuit is positively connected to the external power supply, the switch S is closed, and the external The current output by the power supply flows back to the negative electrode of the external power supply through the switch S and the power circuit.
  • the DC/DC conversion circuit further includes a controller, and the controller is configured to detect the current or voltage at the output end of the external power supply, To determine whether the input terminal is connected to the external power supply in reverse.
  • the controller is used to detect the current or voltage at the output end of the external power supply, or to detect the DC Current or voltage at the input end of the /DC conversion circuit, if it is detected that the direction of the current or voltage is opposite to a preset direction, the preset direction is when the DC/DC conversion circuit is working normally, the DC/DC conversion circuit inputs Direction of the current or voltage at the terminal to determine whether the external power supply is reversely connected to the input terminal of the DC/DC conversion circuit.
  • the controller may be integrated in the controller of the DC/DC conversion circuit so that the function of the controller is realized by the controller of the DC/DC conversion circuit.
  • the controller can also be replaced by manual detection.
  • the DC/DC conversion circuit includes a controller, and the controller is configured to detect the current or voltage at the output end of the external power supply to determine Whether the input terminal is reversely connected to the external power supply.
  • the controller is used to control the switch S to open when it is determined that the input terminal is reversely connected to the external power supply.
  • the controller when the controller detects that the current or voltage at the output end of the external power supply is reversed, or detects or detects that the current or voltage at the input end of the DC/DC conversion circuit is reversed, it indicates that the input end Reverse connection with the external power supply, the controller controls the switch S to open.
  • the controller may be integrated in the controller of the DC/DC conversion circuit, and the controller of the DC/DC conversion circuit includes, but is not limited to, a switching controller of the DC/DC conversion circuit.
  • the multiple DC/DC conversion circuits are provided in parallel between the multiple external power supplies To increase the input current of the power circuit.
  • the power circuit in the DC/DC conversion circuit includes a forward boost, or a reverse boost, or a buck-boost, or Cuk, or Sepic, or Zeta, or a bidirectional buck/boost circuit.
  • the power circuit in the DC/DC conversion circuit is a forward boost circuit.
  • the dotted box 1 is the switch
  • the dotted box 2 is the diode
  • the dotted box 3 is the forward boost power circuit.
  • the power circuit in the DC/DC conversion circuit is a reverse boost circuit.
  • the dotted box 1 is the switch
  • the dotted box 2 is the diode
  • the dotted box 3 is the reverse boost power circuit.
  • the power circuit in the DC/DC conversion circuit is a buck-boost circuit.
  • the dotted box 1 is the switch
  • the dotted box 2 is the diode
  • the dotted box 3 is the buck-boost power circuit.
  • the power circuit in the DC/DC conversion circuit is a Cuk circuit.
  • the dotted box 1 is the switch
  • the dotted box 2 is the diode
  • the dotted box 3 is the Cuk power circuit.
  • the power circuit in the DC/DC conversion circuit is a Sepic circuit.
  • the dotted box 1 is the switch
  • the dotted box 2 is the diode
  • the dotted box 3 is the Sepic power circuit.
  • the power circuit in the DC/DC conversion circuit is a Zeta circuit.
  • the dotted box 1 is the switch
  • the dotted box 2 is the diode
  • the dotted box 3 is the Zeta power circuit.
  • the power circuit in the DC/DC conversion circuit is a bidirectional buck/boost circuit.
  • the dotted box 1 is the switch
  • the dotted box 2 is the diode
  • the dotted box 3 is the bidirectional buck/boost power circuit.
  • the controller includes a switch controller, and the switch controller is used to control the input terminal and the external power supply in the case of reverse connection The switch S is turned off.
  • the switch S includes a relay, or a contactor, or a semiconductor bidirectional switch, or a mechanical switch. Or the switch S is a manual manual disconnect type switch.
  • An embodiment of the present application provides a method for controlling a DC/DC conversion circuit.
  • the DC/DC conversion circuit includes an input terminal, a power circuit and an output terminal, and a bypass circuit.
  • the bypass circuit is unidirectional.
  • a circuit; a switch S is provided between the input terminal and the power circuit, and the input terminal is used to connect with an external power supply; wherein, the external power supply is used to supply power to the DC/DC conversion circuit;
  • the side A circuit is connected between the input terminal and the power circuit, and the diode is disposed between the switch S and the power circuit, wherein the bypass circuit is connected in parallel with the power circuit;
  • a photovoltaic inverter provided by an embodiment of the present application includes the above-mentioned DC/DC conversion circuit, which is provided between the input end of the DC/DC conversion circuit and the power circuit of the DC/DC conversion circuit There is a switch, and a bypass circuit is provided between the switch and the power circuit, wherein the bypass circuit is a unidirectional conduction circuit, which solves the problem that the input terminal of the DC/DC conversion circuit in the prior art is inverse to the external power supply The problem of large circuit loss in the case of connection is used to reduce the loss of the DC/DC conversion circuit when the input terminal is connected to the external power supply in reverse.
  • an embodiment of the present application provides a DC/DC conversion circuit control method.
  • the DC/DC conversion circuit includes an input terminal, a power circuit and an output terminal, and further includes a diode D; the input terminal and all A switch S is provided between the power circuits, and the input terminal is used to connect with an external power supply; wherein, the external power supply is used to supply power to the DC/DC conversion circuit;
  • the diode D is connected between the input terminal and the power circuit, and the diode is disposed between the switch S and the power circuit, wherein the diode D is connected in parallel with the power circuit;
  • the method includes:
  • Step S1501 controlling the switch S to be closed so that the external power supply supplies the DC/DC conversion circuit
  • Step S1052 detecting the current or voltage at the output end of the external power supply to determine whether the external power supply is reversely connected to the input terminal, wherein the external power supply and the input terminal are reversely connected, including the anode of the diode D and The case where the positive pole of the external power supply is connected;
  • Step S1053 When it is determined that the external power supply is reversely connected to the input terminal, the current output from the positive electrode of the external power supply flows through the diode and the switch S, and flows back to the negative electrode of the external power supply.
  • the method is applied to the DC/DC conversion circuit, and the power circuit in the DC/DC conversion circuit may be forward boost, or reverse boost, or buck-boost, or Cuk, or Sepic, or Zeta or bidirectional buck/boost circuit. As shown in Figure 8 to Figure 14.
  • an embodiment of the present application provides a DC/DC conversion circuit control method including:
  • Step S1501 controlling the switch S to be closed so that the external power supply supplies the DC/DC conversion circuit
  • Step S1052 detecting the current or voltage at the output end of the external power supply to determine whether the external power supply is reversely connected to the input terminal, wherein the external power supply and the input terminal are reversely connected, including the anode of the diode D and The case where the positive pole of the external power supply is connected;
  • Step S1053 When it is determined that the external power supply is reversely connected to the input terminal, the current output from the positive electrode of the external power supply flows through the diode and the switch S, and flows back to the negative electrode of the external power supply.
  • Step S1054 controlling the switch S to be turned off to disconnect the external power supply from other circuit elements of the DC/DC conversion circuit.
  • the current output from the positive electrode of the external power supply flows through the diode and the switch S, and flows back to the negative electrode of the external power supply.
  • the method also provides that the switch S is controlled to be turned off to disconnect the external power source from other circuit elements of the DC/DC conversion circuit.
  • the external power source can be disconnected from other circuit elements in the DC/DC conversion circuit, the other circuit elements including the power circuit in the DC/DC conversion circuit.
  • the current or voltage at the output end of the input power supply is detected to determine whether the input end and the external power supply are reversely connected, wherein the reverse connection of the input end and the external power supply includes the diode
  • the method further includes:
  • the input terminal is reversely connected to the external power supply, including the anode of the diode D being connected to the negative electrode of the external power supply via the switch S.
  • the DC/DC conversion circuit further includes a controller, and the controller is configured to detect the output end of the external power supply. Current or voltage to determine whether the input is reversely connected to the external power supply.
  • a possible implementation manner of a DC/DC conversion circuit control method is provided, and the DC/DC conversion circuit to which the method is applied further includes a controller, and the controller is used to determine When the input terminal is reversely connected to the external power supply, the switch S is controlled to be turned off.
  • the controller when the controller detects that the current or voltage at the output end of the external power supply is reversed, or detects or detects that the current or voltage at the input end of the DC/DC conversion circuit is reversed, it indicates that the input end Reverse connection with the external power supply, the controller controls the switch S to open.
  • a method for controlling a DC/DC conversion circuit provided by an embodiment of the present application is applied to the DC/DC conversion circuit, and the power at the input end of the DC/DC conversion circuit and the DC/DC conversion circuit
  • a switch is provided between the circuits, and a diode is provided between the switch and the power circuit. When the input terminal is reversely connected to an external power supply, the switch S is closed.
  • the positive output of the external power supply Current flows through the diode and the switch S and back to the negative electrode of the external power supply, where the reverse connection of the input terminal to the external power supply includes the case where the anode of the diode D is connected to the positive electrode of the external power supply It solves the problem of large circuit loss in the case of the reverse connection of the input terminal of the DC/DC conversion circuit and the external power supply in the prior art, to achieve the reduction of the loss of the DC/DC conversion circuit and the improvement of the reverse connection of the input terminal and the external power supply The efficiency of the photovoltaic inverter.
  • an embodiment of the present application provides a photovoltaic inverter 1600, including a DC/DC conversion circuit 1601, a DC/AC inverter circuit 1602, and a filter circuit 1603, the DC/DC conversion circuit includes an input Terminal, power circuit and output terminal, and also includes diode D;
  • a switch S is provided between the input terminal and the power circuit, and the input terminal is used to connect with an external power supply; wherein, the external power supply is used to supply power to the DC/DC conversion circuit 1601;
  • the diode D is connected between the input terminal and the power circuit, and the diode is disposed between the switch S and the power circuit, wherein the diode D is connected in parallel with the power circuit;
  • the switch S When the input terminal is reversely connected to the external power supply, the switch S is closed, and the current output from the positive electrode of the external power supply flows through the diode and the switch S and flows back to the negative electrode of the external power supply.
  • the reverse connection of the external power supply includes a case where the anode of the diode D is connected to the anode of the external power supply.
  • the input end of the DC/DC conversion circuit 1601 is connected to the output end of the photovoltaic panel or the optimizer, or is connected to other external power sources, and the output end of the DC/DC conversion circuit 1601 is connected to the DC/AC inverter
  • the input terminal of the circuit 1602 is connected, and the output terminal of the DC/AC inverter circuit 1602 is connected to the input terminal of the filter circuit 1603.
  • the DC/DC conversion circuit 1601 is used to boost the DC power input to the photovoltaic inverter in the photovoltaic system, and output the boosted DC power to the DC/AC inverter circuit 1602 for inversion.
  • the DC/DC inverter circuit 1602 inverts the DC power into AC power and outputs it to the filter circuit 1603 for filtering and then supplies it to the load or connects to the power grid.
  • the power circuit in the DC/DC conversion circuit includes forward boost, or reverse boost, or buck-boost, or Cuk, or Sepic, or Zeta, or bidirectional buck/boost circuit. As shown in Figure 8 to Figure 14.
  • the multiple external power sources are arranged in parallel to increase the power The input current of the circuit.
  • the DC/DC conversion circuit further includes a controller, and the controller is configured to detect a current or voltage at an output end of the external power supply, to Determine whether the input terminal is connected to the external power supply in reverse.
  • the DC/DC conversion circuit further includes a controller, and the controller is configured to determine that the input terminal is reversely connected to the external power supply In the case of, control the switch S to open.
  • the controller when the controller detects that the current or voltage at the output end of the external power supply is reversed, or detects or detects that the current or voltage at the input end of the DC/DC conversion circuit is reversed, it indicates that the input end Reverse connection with the external power supply, the controller controls the switch S to open.
  • the controller may be integrated in the controller of the DC/DC conversion circuit, and the controller of the DC/DC conversion circuit includes, but is not limited to, a switching controller of the DC/DC conversion circuit.
  • a possible implementation manner of a photovoltaic inverter is provided, and in a case where the input terminal is reversely connected to the external power supply, the anode of the diode D is connected to the anode of the external power supply Or, the anode of the diode D is connected to the anode of the external power supply via the switch S.
  • a photovoltaic inverter provided by an embodiment of the present application includes the above DC/DC conversion circuit, and a switch is provided between the input end of the DC/DC conversion circuit and the power circuit of the DC/DC conversion circuit, Moreover, a diode is provided between the switch and the power circuit, which solves the problem of large circuit loss in the case where the input terminal of the DC/DC conversion circuit and the external power supply are reversely connected in the prior art, and is used to realize that the input terminal and the external When the power supply is reversely connected, the loss of the DC/DC conversion circuit is reduced, and the efficiency of the photovoltaic inverter is improved.
  • An embodiment of the present application provides a communication system, including a communication device and a communication power supply.
  • the communication power supply is used to supply power to the communication device.
  • the power supply includes a DC/DC conversion circuit, and the DC/DC conversion circuit includes an input terminal, a power circuit, and an output terminal, and further includes a bypass circuit, wherein the bypass circuit is a unidirectional conduction circuit;
  • a switch S is provided between the input terminal and the power circuit, and the input terminal is used to connect with one or more external power supplies; wherein the external power supply is used to supply power to the DC/DC conversion circuit;
  • the bypass circuit is connected between the input terminal and the power circuit, and the bypass circuit is disposed between the switch S and the power circuit, wherein the bypass circuit and the power Circuits in parallel;
  • the switch S is used to close when the input terminal is reversely connected to the external power source, so that the current output from the positive pole of the external power source flows through the bypass circuit and the switch S, and flows back to the The negative pole of the external power supply.
  • the bypass circuit of the DC/DC conversion circuit includes a diode D, wherein the reverse connection of the external power source includes the anode of the diode D and the The case where the positive pole of the external power supply is connected.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmit to another website, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including a server, a data center, and the like integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, solid state disk (SSD)) or the like.

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Abstract

本申请提供一种DC/DC变换电路，包括输入端、功率电路以及输出端，其特征在于，还包括旁路电路，其中，所述旁路电路为单向导通电路；所述输入端与所述功率电路之间设置有开关S，所述输入端用于与一个或多个外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；所述旁路电路连接于所述输入端与所述功率电路之间，且所述旁路电路设置于所述开关S和所述功率电路之间，其中，所述旁路电路与所述功率电路并联；所述开关S用于在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述旁路电路和所述开关S，流回所述外部电源的负极。

Description

一种DC/DC变换电路
本申请要求于2018年12月18日提交中国国家知识产权局、申请号为201811546964.0、申请名称为“一种DC/DC变换电路”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电力电子技术领域，尤其涉及一种DC/DC变换电路。
背景技术
在各种电力电子变换器中，输入电源反接时，如果没有保护措施，会对电路其它器件造成损害。直流-直流变换电路(简称DC/DC电路)是一种将直流进行升压或降压的电路。其输入和输出均为直流。DC/DC电路在储能、电动汽车、新能源、电力系统、电子计算机等领域都有广泛的应用。以Boost功率变换电路为例，如图1所示，输入电源Udc反接后，被开关管T(IGBT或者MOSFET)的寄生二极管D1和功率电感L短路，由于通常开关器件的寄生二极管D1通流能力较小，极大的短路电流会造成开关器件烧毁。
现有的技术，如图2所示，是在功率开关管T上并联通流能力大的Si二极管D3，如下图，当发生输入电源反接时，短路电流从保护二极管D3通过，对功率开关管起到保护作用。
现有的技术在功率开关管T上并联通流能力大的Si二极管D3，对功率开关管起到保护作用。但是，由于大容量Si二极管的寄生结电容较大，该结电容并联在开关管两侧，等效的增大开关管的结电容，从而减慢了功率器件的开关速度。考虑Boost是硬开关电路，减慢的开关速度增大了功率管的开关损耗，降低了电路效率。
因此在不增加损耗的前提下，如何解决输入电源Udc反接情形下对开关器件造成的影响，是一个亟需解决的问题。
发明内容
本申请实施例提供一种DC/DC变换电路，通过在所述DC/DC变换电路的输入端与所述DC/DC变换电路的功率电路之间设置有开关，且在所述开关与所述功率电路之间设置二极管，解决了现有技术中DC/DC变换电路输入端与外部电源反接情况下电路损耗较大的问题，用以实现在输入端与外部电源反接情形下降低DC/DC变换电路损耗。
第一方面，本申请实施例提供一种DC/DC变换电路，包括输入端、功率电路以及输出端，还包括旁路电路，其中，所述旁路电路为单向导通电路；
所述输入端与所述功率电路之间设置有开关S，所述输入端用于与一个或多个外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；
所述旁路电路连接于所述输入端与所述功率电路之间，且所述旁路电路设置于所述开关S和所述功率电路之间，其中，所述旁路电路与所述功率电路并联；
所述开关S用于在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述旁路电路和所述开关S，流回所述外部电源的负极。
有益效果：本申请实施例提供的一种光伏逆变器，包括上述DC/DC变换电路，通过在所述DC/DC变换电路的输入端与所述DC/DC变换电路的功率电路之间设置有开关，且在所述开关与所述功率电路之间设置旁路电路，其中，所述旁路电路为单向导通电路，解决了现有技术中DC/DC变换电路输入端与外部电源反接情况下电路损耗较大的问题，用以实现在输入端与外部电源反接情形下降低DC/DC变换电路损耗。
在一种可能的设计中，所述的DC/DC变换电路，还包括控制器，所述控制器与所述开关S相连，所述控制器用于检测所述外部电源输出端的电流或电压，以确定所述输入端与所述外部电源是否反接；
所述控制器还用于在确定所述输入端与所述外部电源反接时，控制所述开关S断开。
有益效果：通过检测所述外部电源输出端的电流或电压，具体地，包括检测所述电流或电压的方向，能够判断出所述外部电源的输出端的正负极，从而判断出所述外部电源与所述DC/DC变换电路的输入端是否反接。
在一种可能的设计中，所述的DC/DC变换电路的所述旁路电路包括二极管D，其中，所述外部电源反接包括所述二极管D的阳极与所述外部电源的正极相连的情形。
有益效果：通过将所述旁路电路设置为包括二极管D，使得所述旁路电路为单向导通电路。
在一种可能的设计中，所述的DC/DC变换电路中，
所述外部电源反接包括所述二极管D的阳极经所述开关S与所述外部电源的正极相连。
在一种可能的设计中，所述的DC/DC变换电路中，
在所述输入端与所述外部电源正接的情形下，所述二极管D的阳极与所述外部电源的负极相连，或者所述二极管D的阳极经所述开关S与所述外部电源的负极相连。
在一种可能的设计中，所述的DC/DC变换电路中，
所述开关S还用于在所述输入端与所述外部电源正接的情形下闭合，使得所述外部电源输出的电流经所述开关S以及所述功率电路流回所述外部电源的负极。
在一种可能的设计中，所述的DC/DC变换电路中，
所述一个或多个外部电源为多个，所述多个外部电源之间并联设置。
在一种可能的设计中，所述的DC/DC变换电路中，
所述功率电路包括正向Boost、或反向boost、或buck-boost、或Cuk、或Sepic、或Zeta或双向buck/boost电路。
在一种可能的设计中，所述的DC/DC变换电路中，
所述开关S包括继电器、或接触器、或半导体双向开关、或机械开关。
第二方面，本申请实施例提供一种DC/DC变换电路控制方法，所述DC/DC变换电路包括输入端、与功率电路与输出端，还包括旁路电路，其中，所述旁路电路为单向导通电路；所述输入端与所述功率电路之间设置有开关S，所述输入端用于与外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；所述旁路电路连接于所述输入端与所述功率电路之间，且所述二极管设置于所述开关S和所述功率电路之间，其中，所述旁路电路与所述功率电路并联；所述方法包括：
控制所述开关S在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述旁路电路和所述开关S，流回所述外部电源的负极。
有益效果：本申请实施例提供的一种光伏逆变器，包括上述DC/DC变换电路，通过在所述DC/DC变换电路的输入端与所述DC/DC变换电路的功率电路之间设置有开关，且在所述开关与所述功率电路之间设置旁路电路，其中，所述旁路电路为单向导通电路，解决了现有技术中DC/DC变换电路输入端与外部电源反接情况下电路损耗较大的问题，用以实现在输入端与外部电源反接情形下降低DC/DC变换电路损耗。
在一种可能的设计中，所述DC/DC变换电路还包括控制器，所述控制器与所述开关S相连，所述控制所述开关S所述输入端与所述外部电源反接的情形下闭合包括：
所述控制器检测所述外部电源输出端的电流或电压，以确定所述输入端与所述外部电源是否反接；
所述控制器在确定所述输入端与所述外部电源反接时，控制所述开关S闭合。
有益效果：通过检测所述外部电源输出端的电流或电压，具体地，包括检测所述电流或电压的方向，能够判断出所述外部电源的输出端的正负极，从而判断出所述外部电源与所述DC/DC变换电路的输入端是否反接。
在一种可能的设计中，所述DC/DC变换电路的旁路电路包括二极管D，所述控制所述开关S在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述旁路电路和所述开关S，流回所述外部电源的负极，包括：
控制所述开关S在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述二极管D和所述开关S，流回所述外部电源的负极，其中，所述外部电源反接包括所述二极管D的阳极与所述外部电源的正极相连的情形。
有益效果：通过将所述旁路电路设置为包括二极管D，使得所述旁路电路为单向导通电路。
在一种可能的设计中，在确定所述外部电源与所述输入端反接的情形下，使所述外部电源正极输出的电流流经所述二极管和所述开关S，流回所述外部电源的负极之后，所述方法还包括：
控制所述开关S断开，以使所述外部电源与所述DC/DC变换电路其他电路元件断开。
在一种可能的设计中，在检测所述输入电源输出端的电流或电压，以确定所述输入电源是否反接，其中，在所述输入电源反接包括所述二极管D的阳极与所述输入电源的正极相连的情形方面，所述方法还包括：
或者所述输入电源反接包括所述二极管D的阳极经所述开关S与所述输入电源的负极相连。
第三方面，本申请实施例提供一种光伏逆变器，包括DC/DC变换电路、与DC/AC逆变电路、与滤波电路，所述DC/DC变换电路包括输入端、与功率电路与输出端，还包括二极管D；
所述输入端与所述功率电路之间设置有开关S，所述输入端用于与外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；
所述二极管D连接于所述输入端与所述功率电路之间，且所述二极管设置于所述开关S和所述功率电路之间，其中，所述二极管D与所述功率电路并联；
在所述输入端与所述外部电源反接的情形下，所述开关S闭合，所述外部电源正极输出的电流流经所述二极管和所述开关S，流回所述外部电源的负极，其中，在所述外部电源反接包括所述二极管D的阳极与所述外部电源的正极相连的情形。
本申请实施例提供的一种光伏逆变器，包括上述DC/DC变换电路，通过在所述DC/DC变换电路的输入端与所述DC/DC变换电路的功率电路之间设置有开关，且在所述开关与所述功率电路之间设置二极管，解决了现有技术中DC/DC变换电路输入端与外部电源反接情况下电路损耗较大的问题，用以实现在输入端与外部电源反接情形下降低DC/DC变换电路损耗。
在一种可能的设计中，所述的光伏逆变器中，所述DC/DC变换电路还包括控制器，所述控制器用于检测所述外部电源输出端的电流或电压，以确定所述输入端与所述外部电源是否反接；
所述控制器还用于在确定所述输入端与所述外部电源反接时，控制所述开关S闭合。
在一种可能的设计中，所述的光伏逆变器中，所述DC/DC变换电路还包括控制器，所述控制器用于在确定所述输入端与所述外部电源反接的情形下，控制所述开关S断开。
在一种可能的设计中，所述的光伏逆变器中，在所述输入端与所述外部电源反接的情形下，所述二极管D的阳极与所述外部电源的正极相连，或者所述二极管D的阳极经所述开关S与所述外部电源的正极相连。
第四方面，本申请实施例提供一种通信系统，包括通信设备与通信电源，所述通信电源用于为所述通信设备供电，所述电源包括DC/DC变换电路，
所述DC/DC变换电路包括输入端、功率电路以及输出端，其特征在于，还包括旁路电路，其中，所述旁路电路为单向导通电路；
所述输入端与所述功率电路之间设置有开关S，所述输入端用于与一个或多个外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；
所述旁路电路连接于所述输入端与所述功率电路之间，且所述旁路电路设置于所述开关S和所述功率电路之间，其中，所述旁路电路与所述功率电路并联；
所述开关S用于在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述旁路电路和所述开关S，流回所述外部电源的负极。
在一种可能的设计中，所述的通信系统中，所述DC/DC变换电路的旁路电路包括二极管D，其中，所述外部电源反接包括所述二极管D的阳极与所述外部电源的正极相连的情形。
本申请实施例提供的一种通信系统，包括通信设备与通信电源，所述通信电源用于为所述通信设备供电，所述电源包括DC/DC变换电路，，包括上述DC/DC变换电路，通过在所述DC/DC变换电路的输入端与所述DC/DC变换电路的功率电路之间设置有开关，且在所述开关与所述功率电路之间设置二极管，解决了现有技术中DC/DC变换电路输入端与外部电源反接情况下电路损耗较大的问题，用以实现在输入端与外部电源反接情形下降低DC/DC变换电路损耗，提高了所述通信系统的效率。
附图说明
图1为现有技术提供的一种DC/DC变换电路的结构示意图；
图2为现有技术提供的一种DC/DC变换电路的结构示意图；
图3为本申请实施例提供的一种DC/DC变换电路的结构示意图；
图4为本申请实施例提供的另一种DC/DC变换电路的结构示意图；
图5为本申请实施例提供的另一种DC/DC变换电路的结构示意图；
图6为本申请实施例提供的另一种DC/DC变换电路的结构示意图；
图7为本申请实施例提供的另一种DC/DC变换电路的结构示意图；
图8为本申请实施例提供的另一种DC/DC变换电路的结构示意图；
图9为本申请实施例提供的另一种DC/DC变换电路的结构示意图；
图10为本申请实施例提供的另一种DC/DC变换电路的结构示意图；
图11为本申请实施例提供的另一种DC/DC变换电路的结构示意图；
图12为本申请实施例提供的另一种DC/DC变换电路的结构示意图；
图13为本申请实施例提供的另一种DC/DC变换电路的结构示意图；
图14为本申请实施例提供的另一种DC/DC变换电路的结构示意图；
图15为本申请实施例提供的变换电路控制方法流程图；
图16为本申请实施例提供的一种光伏逆变器的结构示意图。
具体实施方式
本申请实施例提供方法和装置是基于同一发明构思的，由于方法及装置解决问题的原理相似，因此装置与方法的实施可以相互参见，重复之处不再赘述。
本申请实施例提供一种DC/DC变换电路，通过在所述DC/DC变换电路的输入端与所述DC/DC变换电路的功率电路之间设置有开关，且在所述开关与所述功率电路之间设置旁路电路，所述旁路电路为单向导通电路，所述旁路电路包括二极管，解决了现有技术中DC/DC变换电路输入端与外部电源反接情况下电路损耗较大的问题，用以实现在输入端与外部电源反接情形下降低DC/DC变换电路损耗。
如图3所示，为本申请实施例提供一种DC/DC变换电路结构示意图，所述变换电路的应用场景为外部电源供电给所述DC/DC变换电路，所述DC/DC变换电路对外部电源输出的电压进行该调整变换。所述外部电源包括但不限于光伏板供电方式，或者包括其他类型的电源形式。
所述DC/DC变换电路包括输入端、输出端、与功率电路和旁路电路，所述输入端与所述功率电路之间还设置有开关S，所述输入端用于与图3中的外部电源连接；
在所述输入端与所述外部电源正接的情形下，所述旁路电路不导通，不工作。所述旁路电路具有单向导通性。所述外部电源用于为所述DC/DC变换电路供电。所述外部电源包括但不限于光伏板供电方式，或者其他类型的电源形式。在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路，在所述外部电源为多个的情形下，所述多个外部电源之间并联设置，以提升所述功率电路的输入电流。
如图4所示，为本申请实施例提供一种DC/DC变换电路结构示意图；
所述DC/DC变换电路包括输入端、与功率电路与输出端，与旁路电路，所述旁路电路包括二极管D；
所述输入端与所述功率电路之间设置有开关S，所述输入端用于与外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；所述外部电源包括但不限于光伏板供电方式，或者其他类型的电源形式。所述二极管D连接于所述输入端与所述功率电路之间，且所述二极管设置于所述开关S和所述功率电路之间，其中，所述二极管D与所述功率电路并联；
具体地，通过将所述二极管D设置于所述开关S和所述功率电路之间，且使所述二极管D与所述功率电路并联设置，用于在所述输入端与所述外部电源反接的情形下，使所述外部电源输出的电流通过所述二极管D和所述开关S形成闭合回路，从而将所述功率电路隔离，降低所述功率电路的损耗，降低所述外部电源反接造成的开关器件过压或过流的的影响。
在所述输入端与所述外部电源反接的情形下，所述开关S闭合，所述外部电源正极输出的电流流经所述二极管和所述开关S，流回所述外部电源的负极，其中，在所述外部电源反接包括所述二极管D的阳极与所述外部电源的正极相连的情形。
具体地，在正常工作情形下，所述输入端与所述外部电源正接，所述二极管D的阳极与所述外部电源的负极相连，或者所述二极管D的阳极经所述开关S与所述外部电源的负极相连。在所述输入端与所述外部电源正接的情形下，所述外部电路正常地位所述DC/DC功率电路供电。
有益效果：本申请实施例提供一种DC/DC变换电路，通过在所述DC/DC变换电路的输入端与所述DC/DC变换电路的功率电路之间设置有开关，且在所述开关与所述功率电路之间设置二极管，解决了现有技术中DC/DC变换电路输入端与外部电源反接情况下电路损耗较大的问题，用以实现在输入端与外部电源反接情形下降低DC/DC变换电路损耗。
可选地，在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路，在所述输入端与所述外部电源反接的情形下，所述二极管D的阳极与所述外部电源的正极相连，或者所述二极管D的阳极经所述开关S与所述外部电源的正极相连。
通过设置所述二级管D的位置，即在所述开关与所述功率电路之间设置二极管设置所述二级管D的位置，使得在所述输入端与所述外部电源反接的情形下，所述外部电源与二极管D形成回路，从而将所述功率电路旁路掉。
可选地，在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路，在所述输入端与所述外部电源正接的情形下，所述二极管D的阳极与所述外部电源的负极 相连，或者所述二极管D的阳极经所述开关S与所述外部电源的负极相连。
在所述外部电源正接的情形下，所述的DC/DC变换电路正常工作，所述外部电源正常为所述DC/DC变换电电路的功率电路供电。
可选地，在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路，在所述输入端与所述外部电源正接的情形下，所述开关S闭合，所述外部电源输出的电流经所述开关S所述功率电路流回所述外部电源的负极。
如图5所示，在本申请实施例一种可能的的实施方式中，所述的DC/DC变换电路，还包括控制器，所述控制器用于检测所述外部电源输出端的电流或电压，以确定所述输入端与所述外部电源是否反接。
具体地，在所述外部电源与所述DC/DC变换电路输入端连接后，将所述开关S闭合后，所述控制器用于检测所述外部电源输出端的电流或电压，或检测所述DC/DC变换电路输入端的电流或电压，若检测到所述电流或电压方向与预设方向相反，所述预设方向为所述DC/DC变换电路正常工作时，所述DC/DC变换电路输入端的电流或电压的方向，从而确定所述外部电源与所述DC/DC变换电路输入端是否反接。所述控制器可以集成在DC/DC变换电路的控制器中，以使所述控制器的功能DC/DC变换电路的控制器来实现。所述控制器也可被人工检测所代替。
如图6所示，在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路包括控制器，所述控制器用于检测所述外部电源输出端的电流或电压，以确定所述输入端与所述外部电源是否反接。
控制器用于在确定所述输入端与所述外部电源反接的情形下，控制所述开关S断开。
具体地，在所述控制器检测到所述外部电源输出端的电流或电压反向，或检测到或检测所述DC/DC变换电路输入端的电流或电压反向的情形下，表明所述输入端与所述外部电源反接，则所述控制器控制所述开关S断开。在所述输入端与所述外部电源连接且所述开关S闭合，直到所述开关S断开前这段时间，所述外部电源正极输出的电流流经所述二极管和所述开关S形成的闭合回路，流回所述外部电源的负极，从而将所述功率电路隔离，降低所述功率电路的损耗，也避免了极大的短路电流对造成开关器件造成影响，甚至将所述DC/DC变换电路中的开关器件烧毁。
所述控制器可以集成在所述的DC/DC变换电路的控制器中，所述的DC/DC变换电路的控制器包括但不限于所述DC/DC变换电路的开关控制器。
如图7所示，在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路，在所述外部电源为多个的情形下，所述多个外部电源之间并联设置，以提升所述功率电路的输入电流。
进一步地，所述DC/DC变换电路中的功率电路包括正向Boost、或反向boost、或buck-boost、或Cuk、或Sepic、或Zeta或双向buck/boost电路。
如图8所示，在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路中 的功率电路为正向Boost电路。
在图8中，虚线方框1为所述开关，虚线方框2中为所述二极管，虚线方框3中所示即为正向Boost功率电路。
如图9所示，在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路中的功率电路为反向boost电路。
在图9中，虚线方框1为所述开关，虚线方框2中为所述二极管，虚线方框3中所示即为反向Boost功率电路。
如图10所示，在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路中的功率电路为buck-boost电路。
在图10中，虚线方框1为所述开关，虚线方框2中为所述二极管，虚线方框3中所示即为buck-boost功率电路。
如图11所示，在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路中的功率电路为Cuk电路。在图11中，虚线方框1为所述开关，虚线方框2中为所述二极管，虚线方框3中所示即为Cuk功率电路。
如图12所示，在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路中的功率电路为Sepic电路。
在图12中，虚线方框1为所述开关，虚线方框2中为所述二极管，虚线方框3中所示即为Sepic功率电路。
如图13所示，在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路中的功率电路为Zeta电路。
在图13中，虚线方框1为所述开关，虚线方框2中为所述二极管，虚线方框3中所示即为Zeta功率电路。
如图14所示，在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路中的功率电路为双向buck/boost电路。
在图14中，虚线方框1为所述开关，虚线方框2中为所述二极管，虚线方框3中所示即为双向buck/boost功率电路。
在一种可能的实施方式中，所述的DC/DC变换电路中，所述控制器包括开关控制器，所述开关控制器用于在确定所述输入端与外部电源反接的情形下，控制所述开关S断开。
在一种可能的实施方式中，所述开关S包括继电器、或接触器、或半导体双向开关、或机械开关。或者所述开关S为人工手动断开型开关。
本申请实施例提供一种DC/DC变换电路控制方法，所述DC/DC变换电路包括输入端、与功率电路与输出端，还包括旁路电路，其中，所述旁路电路为单向导通电路；所述输入端与所述功率电路之间设置有开关S，所述输入端用于与外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；所述旁路电路连接于所述输入端与所述功率电路之间，且所述二极管设置于所述开关S和所述功率电路之间，其中，所述旁路电路与所述功率电路并联；
其特征在于，所述方法包括：
控制所述开关S在所述输入端与所述外部电源反接的情形下闭合，以使所述外部 电源正极输出的电流流经所述旁路电路和所述开关S，流回所述外部电源的负极。
有益效果：本申请实施例提供的一种光伏逆变器，包括上述DC/DC变换电路，通过在所述DC/DC变换电路的输入端与所述DC/DC变换电路的功率电路之间设置有开关，且在所述开关与所述功率电路之间设置旁路电路，其中，所述旁路电路为单向导通电路，解决了现有技术中DC/DC变换电路输入端与外部电源反接情况下电路损耗较大的问题，用以实现在输入端与外部电源反接情形下降低DC/DC变换电路损耗。
如图15所示，本申请实施例提供一种DC/DC变换电路控制方法，所述DC/DC变换电路包括输入端、与功率电路与输出端，还包括二极管D；所述输入端与所述功率电路之间设置有开关S，所述输入端用于与外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；
所述二极管D连接于所述输入端与所述功率电路之间，且所述二极管设置于所述开关S和所述功率电路之间，其中，所述二极管D与所述功率电路并联；
所述方法包括：
步骤S1501：控制所述开关S闭合，以使所述外部电源为所述DC/DC变换电路供电；
步骤S1052：检测所述外部电源输出端的电流或电压，以确定所述外部电源与所述输入端是否反接，其中，所述外部电源与所述输入端反接包括所述二极管D的阳极与所述外部电源的正极相连的情形；
步骤S1053：在确定所述外部电源与所述输入端反接的情形下，使所述外部电源正极输出的电流流经所述二极管和所述开关S，流回所述外部电源的负极。
进一步地，所述方法应用于所述DC/DC变换电路中，所述DC/DC变换电路中的所述功率电路可以为正向Boost、或反向boost、或buck-boost、或Cuk、或Sepic、或Zeta或双向buck/boost电路。如图8到图14所示。
在一种可能的实施方式中，本申请实施例提供一种DC/DC变换电路控制方法包括：
步骤S1501：控制所述开关S闭合，以使所述外部电源为所述DC/DC变换电路供电；
步骤S1052：检测所述外部电源输出端的电流或电压，以确定所述外部电源与所述输入端是否反接，其中，所述外部电源与所述输入端反接包括所述二极管D的阳极与所述外部电源的正极相连的情形；
步骤S1053：在确定所述外部电源与所述输入端反接的情形下，使所述外部电源正极输出的电流流经所述二极管和所述开关S，流回所述外部电源的负极。
步骤S1054：控制所述开关S断开，以使所述外部电源与所述DC/DC变换电路其他电路元件断开。
通过在确定所述外部电源与所述输入端反接的情形下，使所述外部电源正极输出的电流流经所述二极管和所述开关S，流回所述外部电源的负极之后，所述方法还设置：控制所述开关S断开，以使所述外部电源与所述DC/DC变换电路其他电路元件断开。能够使得外部电源与所述DC/DC变换电路中其他电路元件断开，所述其他电路元件包括所述DC/DC变换电路中的功率电路。
在一种可能的实施方式中，在检测所述输入电源输出端的电流或电压，以确定所 述输入端与外部电源是否反接，其中，在所述输入端与外部电源反接包括所述二极管D的阳极与所述外部电源的正极相连的情形方面，所述方法还包括：
或者所述输入端与外部电源反接包括所述二极管D的阳极经所述开关S与所述外部电源的负极相连。
具体地，在本申请本申请实施例提供一种DC/DC变换电路控制方法可能的实施方式中，所述DC/DC变换电路还包括控制器，所述控制器用于检测所述外部电源输出端的电流或电压，以确定所述输入端与所述外部电源是否反接。
在本申请本申请实施例提供一种DC/DC变换电路控制方法可能的实施方式中，所述方法应用于的所述DC/DC变换电路中还包括控制器，所述控制器用于在确定所述输入端与所述外部电源反接的情形下，控制所述开关S断开。
具体地，在所述控制器检测到所述外部电源输出端的电流或电压反向，或检测到或检测所述DC/DC变换电路输入端的电流或电压反向的情形下，表明所述输入端与所述外部电源反接，则所述控制器控制所述开关S断开。在所述输入端与所述外部电源连接且所述开关S闭合，直到所述开关S断开前这段时间，所述外部电源正极输出的电流流经所述二极管和所述开关S形成的闭合回路，流回所述外部电源的负极，从而将所述功率电路隔离，降低所述功率电路的损耗，也避免了极大的短路电流对造成开关器件造成影响，甚至将所述DC/DC变换电路中的开关器件烧毁。
本申请实施例提供的一种DC/DC变换电路控制方法，应用于所述一种DC/DC变换电路，通过在所述DC/DC变换电路的输入端与所述DC/DC变换电路的功率电路之间设置有开关，且在所述开关与所述功率电路之间设置二极管，在所述输入端与外部电源反接的情形下，将所述开关S闭合，所述外部电源正极输出的电流流经所述二极管和所述开关S，流回所述外部电源的负极，其中，在所述输入端与外部电源反接包括所述二极管D的阳极与所述外部电源的正极相连的情形，解决了现有技术中DC/DC变换电路输入端与外部电源反接情况下电路损耗较大的问题，用以实现在输入端与外部电源反接情形下降低DC/DC变换电路损耗，提高了所述光伏逆变器的效率。
如图16所示，本申请实施例提供一种光伏逆变器1600，包括DC/DC变换电路1601、与DC/AC逆变电路1602、与滤波电路1603，所述DC/DC变换电路包括输入端、与功率电路与输出端，还包括二极管D；
所述输入端与所述功率电路之间设置有开关S，所述输入端用于与外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路1601供电；
所述二极管D连接于所述输入端与所述功率电路之间，且所述二极管设置于所述开关S和所述功率电路之间，其中，所述二极管D与所述功率电路并联；
在所述输入端与所述外部电源反接的情形下，所述开关S闭合，所述外部电源正极输出的电流流经所述二极管和所述开关S，流回所述外部电源的负极，其中，在所述外部电源反接包括所述二极管D的阳极与所述外部电源的正极相连的情形。
其中，所述DC/DC变换电路1601的输入端与光伏板或优化器的输出端连接，或者与其他外部电源连接，所述DC/DC变换电路1601的输出端与所述DC/AC逆变电路1602的输入端连接，所述DC/AC逆变电路1602的输出端与滤波电路1603的输入端连接。所述DC/DC变换电路1601用于将光伏系统中给所述光伏逆变器输入的直流电进行升压， 将升压后的直流电输出给所述DC/AC逆变电路1602进行逆变，所述DC/DC逆变电路1602将直流电逆变为交流电后输出给滤波电路1603进行滤波后供给负载或接入电网。所述DC/DC变换电路中的功率电路包括正向Boost、或反向boost、或buck-boost、或Cuk、或Sepic、或Zeta或双向buck/boost电路。如图8到图14所示。在本申请实施例一种可能的实施方式中，所述的DC/DC变换电路，在所述外部电源为多个的情形下，所述多个外部电源之间并联设置，以提升所述功率电路的输入电流。
在本申请实施例提供一种光伏逆变器的一种可能的实施方式中，所述DC/DC变换电路还包括控制器，所述控制器用于检测所述外部电源输出端的电流或电压，以确定所述输入端与所述外部电源是否反接。
在本申请实施例提供一种光伏逆变器一种可能的实施方式中，所述DC/DC变换电路还包括控制器，所述控制器用于在确定所述输入端与所述外部电源反接的情形下，控制所述开关S断开。
具体地，在所述控制器检测到所述外部电源输出端的电流或电压反向，或检测到或检测所述DC/DC变换电路输入端的电流或电压反向的情形下，表明所述输入端与所述外部电源反接，则所述控制器控制所述开关S断开。在所述输入端与所述外部电源连接且所述开关S闭合，直到所述开关S断开前这段时间，所述外部电源正极输出的电流流经所述二极管和所述开关S形成的闭合回路，流回所述外部电源的负极，从而将所述功率电路隔离，降低所述功率电路的损耗，也避免了极大的短路电流对造成开关器件造成影响，甚至将所述DC/DC变换电路中的开关器件烧毁。
所述控制器可以集成在所述的DC/DC变换电路的控制器中，所述的DC/DC变换电路的控制器包括但不限于所述DC/DC变换电路的开关控制器。
在本申请实施例提供一种光伏逆变器一种可能的实施方式中，在所述输入端与所述外部电源反接的情形下，所述二极管D的阳极与所述外部电源的正极相连，或者所述二极管D的阳极经所述开关S与所述外部电源的正极相连。
本申请实施例提供的一种光伏逆变器，包括上述DC/DC变换电路，通过在所述DC/DC变换电路的输入端与所述DC/DC变换电路的功率电路之间设置有开关，且在所述开关与所述功率电路之间设置二极管，解决了现有技术中DC/DC变换电路输入端与外部电源反接情况下电路损耗较大的问题，用以实现在输入端与外部电源反接情形下降低DC/DC变换电路损耗，提高了所述光伏逆变器的效率。
在本申请实施例提供一种通信系统，包括通信设备与通信电源，所述通信电源用于为所述通信设备供电，其特征在于，
所述电源包括DC/DC变换电路，所述DC/DC变换电路包括输入端、功率电路以及输出端，其特征在于，还包括旁路电路，其中，所述旁路电路为单向导通电路；
所述输入端与所述功率电路之间设置有开关S，所述输入端用于与一个或多个外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；
所述旁路电路连接于所述输入端与所述功率电路之间，且所述旁路电路设置于所述开关S和所述功率电路之间，其中，所述旁路电路与所述功率电路并联；
所述开关S用于在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述旁路电路和所述开关S，流回所述外部电源的负极。
在本申请实施例提供一种通信系统一种可能的实施方式中，所述DC/DC变换电路的旁路电路包括二极管D，其中，所述外部电源反接包括所述二极管D的阳极与所述外部电源的正极相连的情形。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘solid state disk(SSD))等。

Claims (20)

  1. 一种DC/DC变换电路，包括输入端、功率电路以及输出端，其特征在于，还包括旁路电路，其中，所述旁路电路为单向导通电路；
    所述输入端与所述功率电路之间设置有开关S，所述输入端用于与一个或多个外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；
    所述旁路电路连接于所述输入端与所述功率电路之间，且所述旁路电路设置于所述开关S和所述功率电路之间，其中，所述旁路电路与所述功率电路并联；
    所述开关S用于在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述旁路电路和所述开关S，流回所述外部电源的负极。
  2. 根据权利要求1所述的DC/DC变换电路，其特征在于，还包括控制器，所述控制器与所述开关S相连，所述控制器用于检测所述外部电源输出端的电流或电压，以确定所述输入端与所述外部电源是否反接；
    所述控制器还用于在确定所述输入端与所述外部电源反接时，控制所述开关S断开。
  3. 根据权利要求1或2所述的DC/DC变换电路，其特征在于，所述旁路电路包括二极管D，其中，所述外部电源反接包括所述二极管D的阳极与所述外部电源的正极相连的情形。
  4. 根据权利要求1-3任一所述的DC/DC变换电路，其特征在于，
    所述外部电源反接包括所述二极管D的阳极经所述开关S与所述外部电源的正极相连。
  5. 根据权利要求1-4任一所述的DC/DC变换电路，其特征在于，
    在所述输入端与所述外部电源正接的情形下，所述二极管D的阳极与所述外部电源的负极相连，或者所述二极管D的阳极经所述开关S与所述外部电源的负极相连。
  6. 根据权利要求1-5任一所述的DC/DC变换电路，其特征在于，
    所述开关S还用于在所述输入端与所述外部电源正接的情形下闭合，使得所述外部电源输出的电流经所述开关S以及所述功率电路流回所述外部电源的负极。
  7. 根据权利要求1-6任一所述的DC/DC变换电路，其特征在于，
    所述一个或多个外部电源为多个，所述多个外部电源之间并联设置。
  8. 根据权利要求1-7任一所述的DC/DC变换电路，其特征在于，
    所述功率电路包括正向Boost、或反向boost、或buck-boost、或Cuk、或Sepic、或Zeta或双向buck/boost电路。
  9. 根据权利要求1-8任一所述的DC/DC变换电路，其特征在于，
    所述开关S包括继电器、或接触器、或半导体双向开关、或机械开关。
  10. 一种DC/DC变换电路控制方法，所述DC/DC变换电路包括输入端、与功率电路与输出端，还包括旁路电路，其中，所述旁路电路为单向导通电路；所述输入端与所述功率电路之间设置有开关S，所述输入端用于与外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；所述旁路电路连接于所述输入端与所述功率电路之间，且所述二极管设置于所述开关S和所述功率电路之间，其中，所述旁路电路与所述功率电路并联；
    其特征在于，所述方法包括：
    控制所述开关S在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述旁路电路和所述开关S，流回所述外部电源的负极。
  11. 根据权利要求10所述DC/DC变换电路控制方法，其特征在于，
    所述DC/DC变换电路还包括控制器，所述控制器与所述开关S相连，所述控制所述开关S所述输入端与所述外部电源反接的情形下闭合包括：
    所述控制器检测所述外部电源输出端的电流或电压，以确定所述输入端与所述外部电源是否反接；
    所述控制器在确定所述输入端与所述外部电源反接时，控制所述开关S闭合。
  12. 根据权利要求10或11所述DC/DC变换电路控制方法，其特征在于，
    所述DC/DC变换电路的旁路电路包括二极管D，所述控制所述开关S在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述旁路电路和所述开关S，流回所述外部电源的负极，包括：
    控制所述开关S在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述二极管D和所述开关S，流回所述外部电源的负极，其中，所述外部电源反接包括所述二极管D的阳极与所述外部电源的正极相连的情形。
  13. 根据权利要求10-12任一所述DC/DC变换电路控制方法，其特征在于，在确定所述外部电源与所述输入端反接的情形下，使所述外部电源正极输出的电流流经所述二极管和所述开关S，流回所述外部电源的负极之后，所述方法还包括：
    控制所述开关S断开，以使所述外部电源与所述DC/DC变换电路其他电路元件断开。
  14. 根据权利要求10-13任一所述DC/DC变换电路控制方法，其特征在于，在检测所述输入电源输出端的电流或电压，以确定所述输入电源是否反接，其中，在所述输入电源反接包括所述二极管D的阳极与所述输入电源的正极相连的情形方面，所述方法还包括：
    或者所述输入电源反接包括所述二极管D的阳极经所述开关S与所述输入电源的负极相连。
  15. 一种光伏逆变器，包括DC/DC变换电路、与DC/AC逆变电路、与滤波电路，其特征在于，
    所述DC/DC变换电路包括输入端、功率电路以及输出端，其特征在于，还包括旁路电路，其中，所述旁路电路为单向导通电路；
    所述输入端与所述功率电路之间设置有开关S，所述输入端用于与一个或多个外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；
    所述旁路电路连接于所述输入端与所述功率电路之间，且所述旁路电路设置于所述开关S和所述功率电路之间，其中，所述旁路电路与所述功率电路并联；
    所述开关S用于在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述旁路电路和所述开关S，流回所述外部电源的负极。
  16. 根据权利要求15所述的光伏逆变器，其特征在于，所述DC/DC变换电路还包括控制器，
    所述控制器与所述开关S相连，所述控制器用于检测所述外部电源输出端的电流或电压，以确定所述输入端与所述外部电源是否反接；
    所述控制器还用于在确定所述输入端与所述外部电源反接时，控制所述开关S断开。
  17. 根据权利要求15或16所述的光伏逆变器，其特征在于，所述DC/DC变换电路还包括控制器，所述控制器用于在确定所述输入端与所述外部电源反接的情形下，控制所述开关S断开。
  18. 根据权利要求17所述的光伏逆变器，其特征在于，在所述输入端与所述外部电源反接的情形下，所述二极管D的阳极与所述外部电源的正极相连，或者所述二极管D的阳极经所述开关S与所述外部电源的正极相连。
  19. 一种通信系统，包括通信设备与通信电源，所述通信电源用于为所述通信设备供电，其特征在于，
    所述电源包括DC/DC变换电路，所述DC/DC变换电路包括输入端、功率电路以及输出端，其特征在于，还包括旁路电路，其中，所述旁路电路为单向导通电路；
    所述输入端与所述功率电路之间设置有开关S，所述输入端用于与一个或多个外部电源连接；其中，所述外部电源用于为所述DC/DC变换电路供电；
    所述旁路电路连接于所述输入端与所述功率电路之间，且所述旁路电路设置于所述开关S和所述功率电路之间，其中，所述旁路电路与所述功率电路并联；
    所述开关S用于在所述输入端与所述外部电源反接的情形下闭合，以使所述外部电源正极输出的电流流经所述旁路电路和所述开关S，流回所述外部电源的负极。
  20. 根据权利要求19所述的通信系统，其特征在于，
    所述DC/DC变换电路的旁路电路包括二极管D，其中，所述外部电源反接包括所述二极管D的阳极与所述外部电源的正极相连的情形。
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