Direct-current power converter capable of actively distributing power

Abstract

A direct-current power converter capable of actively distributing power comprises a power conversion unit, a plurality of switch elements and a control unit. Each switching element is provided with a control end, a first end and a second end. The first end receives a plurality of DC input power supplies, and the second end is connected with the power supply conversion unit. The number of the switch elements is the same as that of the DC input power supplies. The control unit provides a plurality of control signals, and correspondingly controls the switch-on and switch-off of the switch element through the control end, so that the power supply conversion unit provides an output power supply. The control unit controls the proportion of the turn-on times of the switch element through the control signal according to the proportion of the power provided by the direct current input power supply required by the output power supply.

Description

Technical Field

[0001] The present invention relates to a DC power converter, and more particularly to a DC power converter that actively distributes power. Background Art

[0002] Multi-input power converters often use a DC power supply obtained by converting AC mains power in combination with a battery power supply as the DC input power supply. However, existing multi-input power converters mostly supply power alternately with a DC power supply of a fixed size (converting AC mains power) and a DC input power supply (battery power supply). If the sizes of the two power supplies are similar, there will be no problem in power supply. However, if the sizes of the two power supplies differ greatly, if power is still supplied alternately with a DC power supply of a fixed size and a DC input power supply, problems in power supply stability, coordination, and efficiency will easily occur.

[0003] Therefore, how to design a DC power converter that actively distributes power to solve the problems and technical bottlenecks existing in the prior art is an important topic studied by the inventors of this case. Summary of the Invention

[0004] The object of the present invention is to provide a DC power converter that actively distributes power. The DC power converter that actively distributes power includes a power conversion unit, a plurality of switching elements, and a control unit. Each switching element has a control terminal, a first terminal, and a second terminal. The first terminal receives a plurality of DC input power supplies respectively, and the second terminal is connected to the power conversion unit, where the number of switching elements is the same as the number of DC input power supplies. The control unit provides a plurality of control signals and correspondingly controls the conduction and cutoff of the switching elements through the control terminals, so that the power conversion unit provides an output power supply. The control unit controls the ratio of the conduction times of the switching elements through the control signals according to the ratio of the power required by the output power supply from the DC input power supplies.

[0005] Further, the DC power converter that actively distributes power further includes a plurality of measurement units. The measurement units are respectively arranged on the connection paths between the DC input power supplies and the switching elements to respectively measure the power provided by the DC input power supplies.

[0006] Further, the number of DC input power supplies is two, including a first DC input power supply and a second DC input power supply. The number of switching elements is two, including a first switching element and a second switching element. The number of control signals is two, including a first control signal and a second control signal. The control unit controls the first switching element and the second switching element to conduct alternately at a ratio of conduction times through the first control signal and the second control signal in a time interval.

[0007] Further, the number of the measurement units is two, including a first measurement unit and a second measurement unit. The first measurement unit measures the first power provided by the first DC input power supply and provides a first measurement signal to the control unit. The second measurement unit measures the second power provided by the second DC input power supply and provides a second measurement signal to the control unit.

[0008] Further, the first DC input power supply is a DC power supply converted from AC mains electricity, and the second DC input power supply is a DC power supply provided by a battery.

[0009] Further, the power conversion unit is a buck circuit for buck-converting the voltage of the DC input power supply into the output power supply.

[0010] Further, the power conversion unit is a boost circuit for boost-converting the voltage of the DC input power supply into the output power supply.

[0011] Further, the power conversion unit is a buck-boost circuit for boost or buck-converting the voltage of the DC input power supply into the output power supply.

[0012] Further, when the proportion of the power provided by the first DC input power supply and the second DC input power supply for the output power supply is 1:1, in the time interval, the ratio of the conduction times of the first switch element controlled by the first control signal to the conduction times of the second switch element controlled by the second control signal is 1:1.

[0013] Further, when the proportion of the power provided by the first DC input power supply and the second DC input power supply for the output power supply is N:1, in the time interval, the ratio of the conduction times of the first switch element controlled by the first control signal to the conduction times of the second switch element controlled by the second control signal is N:1; where N is a number greater than zero.

[0014] The beneficial effect of the present invention is that according to the proportion of the power that the DC input power supply can provide, the ratio of the conduction times of the switch elements is controlled to generate the output power supply, so that the DC input power supply can be flexibly and efficiently utilized to actively distribute the DC input power supply. Description of the Drawings

[0015] Figure 1 It is a circuit block diagram of the first embodiment of the DC power converter for actively distributing power.

[0016] Figure 2A It is a schematic diagram of the power conversion unit of the DC power converter for actively distributing power converting the first DC input power supply.

[0017] Figure 2B It is a schematic diagram of the power conversion unit of the DC power converter for actively distributing power converting the first DC input power supply.

[0018] Figure 3A Schematic diagram of the power conversion unit of a DC power converter for actively allocating power to convert the second DC input power supply.

[0019] Figure 3B Schematic diagram of the power conversion unit of a DC power converter for actively allocating power to convert the second DC input power supply.

[0020] Figure 4 Circuit block diagram of the second embodiment of the DC power converter for actively allocating power according to the present invention.

[0021] Figure 5A Schematic diagram of the power conversion unit of a DC power converter for actively allocating power according to the present invention to convert the first DC input power supply.

[0022] Figure 5B Schematic diagram of the power conversion unit of a DC power converter for actively allocating power according to the present invention to convert the first DC input power supply.

[0023] Figure 5C Schematic diagram of the power conversion unit of a DC power converter for actively allocating power according to the present invention to convert the second DC input power supply.

[0024] Figure 5D Schematic diagram of the power conversion unit of a DC power converter for actively allocating power according to the present invention to convert the second DC input power supply.

[0025] Figure 6 Schematic diagram of the first DC input power supply and the second DC input power supply of the DC power converter for actively allocating power according to the present invention to provide a 1:1 output.

[0026] Figure 7 Schematic diagram of the first DC input power supply and the second DC input power supply of the DC power converter for actively allocating power according to the present invention to provide a 2:1 output.

[0027] Figure 8 Schematic diagram of the first DC input power supply and the second DC input power supply of the DC power converter for actively allocating power according to the present invention to provide a 1:2 output.

[0028] Wherein, 10: power conversion unit, 100: control unit, 11: first measurement unit, 12: second measurement unit, Q1: first switching element, Q2: second switching element, Vin1: first DC input power supply, Vin2: second DC input power supply, SC1: first control signal, SC2: second control signal, S1: first measurement signal, S2: second measurement signal, VO: output power supply, Lm: inductor. Detailed implementation manners

[0029] Regarding the technical content and detailed description of the present invention, it is described in conjunction with the drawings as follows.

[0030] Please refer to Figure 1 As shown, the DC power converter that actively distributes power (hereinafter referred to as the DC power converter) includes a power conversion unit 10, a first switching element Q1, a second switching element Q2, and a control unit 100. Each switching element has a control terminal, a first terminal, and a second terminal. The first terminals respectively receive a first DC input power supply Vin1 and a second DC input power supply Vin2, and the second terminals are connected to the power conversion unit 10, where the number of the switching elements Q1 and Q2 is the same as the number of the DC input power supplies Vin1 and Vin2.

[0031] The control unit 100 provides a first control signal SC1 and a second control signal SC2, and correspondingly controls the conduction and cutoff of the first switching element Q1 and the second switching element Q2 through the control terminals, so that the power conversion unit 10 provides an output power supply VO.

[0032] The control unit 100 controls the ratio of the conduction times of the first switching element Q1 and the second switching element Q2 by controlling the first control signal SC1 and the second control signal SC2 according to the ratio of the power required by the output power supply VO from the first DC input power supply Vin1 and the second DC input power supply Vin2.

[0033] Please refer to Figure 4 as shown, Figure 4 The most significant difference between the second embodiment shown in Figure 1 and the first embodiment shown in Figure 4 is that the DC power converter shown in

[0034] also includes a first measurement unit 11 and a second measurement unit 12. The first measurement unit 11 and the second measurement unit 12 are respectively arranged on the connection paths between the first DC input power supply Vin1 and the second DC input power supply Vin2 and the first switching element Q1 and the second switching element Q2 to respectively measure the power provided by the first DC input power supply Vin1 and the second DC input power supply Vin2. Figure 4, assume the number of the DC input power supplies Vin1 and Vin2 is two, that is, it includes a first DC input power supply Vin1 and a second DC input power supply Vin2. Corresponding to the two sets of DC input power supplies, the number of the switching elements Q1 and Q2 is two, that is, it includes a first switching element Q1 and a second switching element Q2. And, the number of the control signals SC1 and SC2 is two, that is, it includes a first control signal SC1 and a second control signal SC2. The control unit 100 controls the first switching element Q1 and the second switching element Q2 to conduct alternately in proportion to the number of conduction times in the time interval through the first control signal SC1 and the second control signal SC2.

[0035] The first measurement unit 11 measures the first power provided by the first DC input power supply Vin1, and provides a first measurement signal S1 to the control unit 100. The second measurement unit 12 measures the second power provided by the second DC input power supply Vin2, and provides a second measurement signal S2 to the control unit 100.

[0036] Incidentally, the first DC input power supply Vin1 can be a DC power supply converted from AC mains, and the second DC input power supply Vin2 can be a DC power supply provided by a battery, but it is not limited thereto.

[0037] Furthermore, in the present invention, the power conversion unit 10 is a power conversion unit for DC-to-DC conversion. For example, but not limited to, the power conversion unit 10 is a buck converter, which is used to step down the voltage of the first DC input power supply Vin1 or the second DC input power supply Vin2 to the output power supply VO. As shown in the embodiment depicted in the drawings of the present invention. Or, the power conversion unit 10 is a boost converter, which is used to step up the voltage of the first DC input power supply Vin1 or the second DC input power supply Vin2 to the output power supply VO. Or, the power conversion unit 10 is a buck-boost converter, which is used to step up or step down the voltage of the first DC input power supply Vin1 or the second DC input power supply Vin2 to the output power supply VO.

[0038] The operation of the active power distribution of the DC power converter of the present invention will be described below. Taking Figure 2A 、 Figure 2B and Figure 3A 、 Figure 3B as an example. When the first DC input power supply Vin1 supplies power, the second DC input power supply Vin2 does not supply power; conversely, when the second DC input power supply Vin2 supplies power, the first DC input power supply Vin1 does not supply power. Therefore, referring to Figure 2A and Figure 2BAs shown, these are respectively schematic diagrams of the power conversion unit of the DC power converter that actively distributes power according to the present invention for converting the first DC input power supply.

[0039] As Figure 2A shown, when the first DC input power supply Vin1 is used to provide the output power supply VO through the power conversion unit 10 (taking a buck circuit as an example), the first control signal SC1 provided by the control unit 100 (for example, but not limited to, the first control signal SC1 being a high-level signal) controls the first switching element Q1 to conduct, and the second control signal SC2 provided by the control unit 100 (for example, but not limited to, the second control signal SC2 being a low-level signal) controls the second switching element Q2 to turn off. Therefore, the power of the first DC input power supply Vin1 is stored in the inductor Lm of the power conversion unit 10, which is an energy storage operation, and the first energy storage path P11 is as Figure 2A shown.

[0040] Then, as Figure 2B shown, when the first control signal SC1 provided by the control unit 100 (for example, but not limited to, the first control signal SC1 being a low-level signal) controls the first switching element Q1 to turn off (the second switching element Q2 remains off), the energy stored in the inductor Lm is provided to the output side of the power conversion unit 10 through the first energy release path P12 to serve as the output power supply VO. Therefore, through Figure 2A the energy storage operation and Figure 2B the energy release operation, the first DC input power supply Vin1 provides the output power supply VO through the power conversion unit 10.

[0041] Similarly, referring to Figure 3A and Figure 3B shown, these are respectively schematic diagrams of the power conversion unit of the DC power converter that actively distributes power according to the present invention for converting the second DC input power supply.

[0042] As Figure 3A shown, when the second DC input power supply Vin2 is used to provide the output power supply VO through the power conversion unit 10 (taking a buck circuit as an example), the second control signal SC2 provided by the control unit 100 (for example, but not limited to, the second control signal SC2 being a high-level signal) controls the second switching element Q2 to conduct, and the first control signal SC1 provided by the control unit 100 (for example, but not limited to, the first control signal SC1 being a low-level signal) controls the first switching element Q1 to turn off. Therefore, the power of the second DC input power supply Vin2 is stored in the inductor Lm of the power conversion unit 10, which is an energy storage operation, and the second energy storage path P21 is as Figure 3A shown.

[0043] Then, as Figure 3BAs shown, when the second control signal SC2 provided by the control unit 100 (for example, but not limited to, the second control signal SC2 being a low-level signal) controls the second switching element Q2 to turn off (the first switching element Q1 remains off), the energy stored in the inductor Lm is provided to the output side of the power conversion unit 10 through the second energy release path P22 as the output power supply VO. Therefore, through Figure 3A the energy storage operation of Figure 3B and the energy release operation of

[0044] the second DC input power supply Vin2 provides the output power supply VO through the power conversion unit 10.

[0045] With reference to Figure 6 shown, which is a schematic diagram of the first DC input power supply and the second DC input power supply of the DC power converter for actively distributing power according to the present invention to provide an output of 1:1. As Figure 6 shown, OPE11 shows Figure 2A the operation of the inductor Lm of the power conversion unit 10 for the first energy storage, OPE12 shows Figure 2B the operation of the inductor Lm of the power conversion unit 10 for the first energy release, OPE21 shows Figure 3A the operation of the inductor Lm of the power conversion unit 10 for the second energy storage, and OPE22 shows Figure 3B the operation of the inductor Lm of the power conversion unit 10 for the second energy release. Therefore, Figure 6 shown is the continuous operation of the first energy storage, the first energy release, the second energy storage, and the second energy release (that is, after the second energy release is completed, the first energy storage continues), so that the power supply operation can be achieved when the output power supply VO of the power conversion unit 10 needs to be provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 in a ratio of 1:1.

[0046] The present invention can not only achieve the power supply operation when the power ratio of the aforementioned output power supply VO provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 is 1:1, but also further achieve the power supply operation when the power ratio of the aforementioned output power supply VO provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 is N:1, where N is a number greater than zero, which is described as follows.

[0047] Please refer to Figure 5A 、 Figure 5B as shown, which are respectively schematic diagrams of the power conversion unit of the DC power converter for actively distributing power in the present invention to convert the first DC input power supply; please refer to Figure 5C and Figure 5D as shown, which are respectively schematic diagrams of the power conversion unit of the DC power converter for actively distributing power in the present invention to convert the second DC input power supply, and cooperate with referring to Figure 4 .

[0048] As mentioned above, Figure 4 compared with Figure 1 it further includes a first measurement unit 11 and a second measurement unit 12. The first measurement unit 11 measures the first power provided by the first DC input power supply Vin1 and provides a first measurement signal S1 to the control unit 100. The second measurement unit 12 measures the second power provided by the second DC input power supply Vin2 and provides a second measurement signal S2 to the control unit 100. Therefore, the control unit 100 controls the conduction ratio of the first switching element Q1 and the second switching element Q2 through the first control signal SC1 and the second control signal SC2 according to the power ratio of the output power supply VO provided by the first DC input power supply Vin1 and the second DC input power supply Vin2.

[0049] As Figure 5A shown, when the first DC input power supply Vin1 is used to provide the output power supply VO through the power conversion unit 10 (taking a buck circuit as an example), the first control signal SC1 provided by the control unit 100 (for example, but not limited to the first control signal SC1 being a high-level signal) controls the first switching element Q1 to conduct, and the second control signal SC2 provided by the control unit 100 (for example, but not limited to the second control signal SC2 being a low-level signal) controls the second switching element Q2 to turn off. Therefore, the power of the first DC input power supply Vin1 is stored in the inductor Lm of the power conversion unit 10 for energy storage operation, and the first energy storage path P11 is as Figure 5A shown. And the first power flowing from the first DC input power supply Vin1 through the first switching element Q1 can be measured by the first measurement unit 11.

[0050] Then, as Figure 5BAs shown, when the first control signal SC1 provided by the control unit 100 (for example, but not limited to, the first control signal SC1 being a low-level signal) controls the first switching element Q1 to turn off (the second switching element Q2 remains off), the energy stored in the inductor Lm is provided to the output side of the power conversion unit 10 through the first energy release path P12 to serve as the output power supply VO. Therefore, through Figure 5A 's energy storage operation and Figure 5B 's energy release operation, the first DC input power supply Vin1 provides the output power supply VO through the power conversion unit 10.

[0051] Similarly, referring to Figure 5C and Figure 5D shown, which are respectively schematic diagrams of the power conversion unit of the DC power converter for actively distributing power in the present invention to convert the second DC input power supply.

[0052] As Figure 5C shown, when the second DC input power supply Vin2 is used to provide the output power supply VO through the power conversion unit 10 (taking a buck circuit as an example), the second control signal SC2 provided by the control unit 100 (for example, but not limited to, the second control signal SC2 being a high-level signal) controls the second switching element Q2 to turn on, and the first control signal SC1 provided by the control unit 100 (for example, but not limited to, the first control signal SC1 being a low-level signal) controls the first switching element Q1 to turn off. Therefore, the power of the second DC input power supply Vin2 is stored in the inductor Lm of the power conversion unit 10, which is an energy storage operation, and the second energy storage path P21 is as Figure 5C shown. And the second power flowing from the second DC input power supply Vin2 through the second switching element Q2 can be measured by the second measurement unit 12.

[0053] Then, as Figure 5D shown, when the second control signal SC2 provided by the control unit 100 (for example, but not limited to, the second control signal SC2 being a low-level signal) controls the second switching element Q2 to turn off (the first switching element Q1 remains off), the energy stored in the inductor Lm is provided to the output side of the power conversion unit 10 through the second energy release path P22 to serve as the output power supply VO. Therefore, through Figure 5C 's energy storage operation and Figure 5D 's energy release operation, the second DC input power supply Vin2 provides the output power supply VO through the power conversion unit 10.

[0054] Therefore, according to the magnitudes of the first power and the second power measured by the first measurement unit 11 and the second measurement unit 12, when the ratio of the power provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 to the output power VO of the power conversion unit 10 is N:1 (i.e., judged based on the available first power and second power), within a certain time interval, the ratio of the number of times the first control signal SC1 controls the first switching element Q1 to conduct to the number of times the second control signal SC2 controls the second switching element Q2 to conduct is N:1. For example, if the number of times the first switching element Q1 conducts is 100 times and the number of times the second switching element Q2 conducts is 50 times, then N is 2. Or, for example, if the number of times the first switching element Q1 conducts is 50 times and the number of times the second switching element Q2 conducts is 100 times, then N is 0.5. In other words, the first DC input power supply Vin1 and the second DC input power supply Vin2 alternately (or staggeredly) provide the output power VO of the power conversion unit 10.

[0055] For example, if the ratio of the available power of the first DC input power supply Vin1 to the available power of the second DC input power supply Vin2 is approximately 2:1, it is possible to select to control the first DC input power supply Vin1 to provide more power supply as the output power VO. In this way, the ratio of the number of times the first switching element Q1 conducts to the number of times the second switching element Q2 conducts can be controlled to be 2:1, enabling the first DC input power supply Vin1 to bear a higher power supply responsibility.

[0056] With reference to Figure 7 shown in the figure, it is a schematic diagram of the first DC input power supply and the second DC input power supply of the DC power converter for actively distributing power according to the present invention providing an output of 2:1. As Figure 7 shown, OPE11 shows that Figure 5A for the inductor Lm of the power conversion unit 10 shown in, it is the operation of the first energy storage, OPE12 shows that Figure 5B for the inductor Lm of the power conversion unit 10 shown in, it is the operation of the first energy release, OPE21 shows that Figure 5C for the inductor Lm of the power conversion unit 10 shown in, it is the operation of the second energy storage, and OPE22 shows that Figure 5D for the inductor Lm of the power conversion unit 10 shown in, it is the operation of the second energy release. Therefore, Figure 7 shown is the continuous operation of the first energy storage, the first energy release, the first energy storage, the first energy release (i.e., the first energy storage and the first energy release operate continuously twice), the second energy storage, and the second energy release (i.e., after the second energy release is completed, the first energy storage is continued). In this way, the power supply operation can be achieved when the ratio of the power provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 to the output power VO of the power conversion unit 10 is 2:1.

[0057] However, although Figure 7The energy storage and energy release operations can achieve a power supply operation when the power provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 is in a ratio of 2:1, but not limited thereto. In other words, as long as the first energy storage and the first energy release operations can be achieved twice in a time interval (not necessarily continuously twice as shown in Figure 7 ), and the second energy storage and the second energy release operations can be achieved once, the power supply operation when the power provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 is in a ratio of 2:1 can be achieved. Similarly, if it is necessary to achieve a power supply operation when the power provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 is in a ratio of 3:1, as long as the first energy storage and the first energy release operations can be achieved three times in a time interval (not necessarily continuously three times), and the second energy storage and the second energy release operations can be achieved once, the power supply operation when the power provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 is in a ratio of 3:1 can be achieved, and so on.

[0058] Conversely, if the ratio of the available power of the first DC input power supply Vin1 to the available power of the second DC input power supply Vin2 is approximately 1:2, the second DC input power supply Vin2 can be selected to provide more power supply as the output power supply VO. In this way, the ratio of the conduction times of the first switching element Q1 to the conduction times of the second switching element Q2 can be controlled to be 1:2, so that the second DC input power supply Vin2 bears a higher power supply responsibility.

[0059] Refer to Figure 8 for illustration. It is a schematic diagram of the first DC input power supply and the second DC input power supply of the DC power converter for actively distributing power according to the present invention to provide an output of 1:2. As shown in Figure 8 , OPE11 shows that the inductor Lm of the power conversion unit 10 of Figure 5A is the operation of the first energy storage, OPE12 shows that the inductor Lm of the power conversion unit 10 of Figure 5B is the operation of the first energy release, OPE21 shows that the inductor Lm of the power conversion unit 10 of Figure 5C is the operation of the second energy storage, and OPE22 shows that the inductor Lm of the power conversion unit 10 of Figure 5D is the operation of the second energy release. Therefore, Figure 8 shows the continuous operation of the second energy storage, the second energy release, the second energy storage, the second energy release (that is, the second energy storage and the second energy release are continuously operated twice), the first energy storage, and the first energy release (that is, after the first energy release is completed, the second energy storage is continued). In this way, the power supply operation when the output power supply VO of the power conversion unit 10 needs to be provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 in a ratio of 1:2 can be achieved.

[0060] However, althoughFigure 8 The energy storage and energy release operations can achieve the power supply operation when the power provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 is in a ratio of 1:2, but not limited thereto. In other words, as long as the second energy storage and second energy release operations can be achieved twice (not necessarily continuously twice as shown in Figure 8 ), and the first energy storage and first energy release operations can be achieved once, the power supply operation when the power provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 is in a ratio of 1:2 can be achieved. Similarly, if the power supply operation when the power provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 is in a ratio of 1:3 is to be achieved, as long as the second energy storage and second energy release operations can be achieved three times (not necessarily continuously three times) in the time interval, and the first energy storage and first energy release operations can be achieved once, the power supply operation when the power provided by the first DC input power supply Vin1 and the second DC input power supply Vin2 is in a ratio of 1:3 can be achieved, and so on.

[0061] In summary, the present invention has the following features and advantages: According to the ratio of the power that the DC input power supplies Vin1 and Vin2 can provide, the ratio of the conduction times of the switching elements Q1 and Q2 is controlled to generate the output power supply VO, so that the DC input power supplies Vin1 and Vin2 can be flexibly and efficiently utilized to actively distribute the DC input power supplies Vin1 and Vin2.

Claims

1. A DC power converter for active power distribution, comprising: Power conversion unit; A plurality of switch elements, each of which has a control end, a first end and a second end; the first end receives a plurality of DC input power supplies respectively, and the second end is connected to the power conversion unit, wherein the number of the switch elements is the same as the number of the DC input power supplies; as well as A control unit, providing a plurality of control signals, and correspondingly controlling the on and off of the switch element through the control terminal, so that the power conversion unit provides output power; The control unit controls the proportion of the number of times the switch element is turned on through the control signal according to the proportion of the power required by the output power to be provided by the DC input power.

2. The DC power converter with active power distribution according to claim 1, characterized in that: Also includes: A plurality of measuring units are respectively arranged on the connection paths between the DC input power source and the switch element to respectively measure the power provided by the DC input power source.

3. The DC power converter with active power distribution according to claim 2, characterized in that: The number of the DC input power sources is two, including a first DC input power source and a second DC input power source; the number of the switch elements is two, including a first switch element and a second switch element; the number of the control signals is two, including a first control signal and a second control signal; The control unit controls the first switch element and the second switch element to be alternately turned on in a ratio of the number of times of conduction in a time interval through the first control signal and the second control signal.

4. The DC power converter for active power distribution according to claim 3, characterized in that: The number of the measuring units is two, including a first measuring unit and a second measuring unit; The first measuring unit measures the first power provided by the first DC input power source and provides a first measuring signal to the control unit; the second measuring unit measures the second power provided by the second DC input power source and provides a second measuring signal to the control unit.

5. The DC power converter with active power distribution according to claim 3, characterized in that: The first DC input power source is a DC power source that converts AC mains power, and the second DC input power source is a DC power source provided by a battery.

6. The DC power converter with active power distribution according to claim 1, characterized in that: The power conversion unit is a step-down circuit for stepping down and converting the voltage of the DC input power into the output power.

7. The DC power converter with active power distribution according to claim 1, characterized in that: The power conversion unit is a boost circuit for boosting and converting the voltage of the DC input power into the output power.

8. The DC power converter with active power distribution according to claim 1, characterized in that: The power conversion unit is a step-up / step-down circuit, which is used for stepping up or stepping down the voltage of the DC input power to convert it into the output power.

9. The DC power converter with active power distribution according to claim 3, characterized in that: When the output power needs to be provided by the first DC input power supply and the second DC input power supply in a ratio of 1:1, in the time interval, the ratio of the number of times the first switch element is turned on controlled by the first control signal to the number of times the second switch element is turned on controlled by the second control signal is 1:

1.

10. The DC power converter with active power distribution according to claim 3, characterized in that: When the output power needs to be provided by the first DC input power supply and the second DC input power supply in a ratio of N:1, in the time interval, the ratio of the number of times the first switch element is turned on controlled by the first control signal to the number of times the second switch element is turned on controlled by the second control signal is N:1; wherein N is a number greater than zero.

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