CN109980956B - Direct current power supply - Google Patents
Direct current power supply Download PDFInfo
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- CN109980956B CN109980956B CN201910242595.4A CN201910242595A CN109980956B CN 109980956 B CN109980956 B CN 109980956B CN 201910242595 A CN201910242595 A CN 201910242595A CN 109980956 B CN109980956 B CN 109980956B
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- bridge arm
- power supply
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- direct current
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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
- 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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
- H02M3/1584—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 including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
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- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the invention provides a direct current power supply, which comprises a rectifying circuit and a direct current power conversion circuit; the input end of the rectifying circuit is used for being connected with a first power supply/load, and the output end of the rectifying circuit is used as a direct current bus and connected with the input end of the direct current power conversion circuit, so that alternating current-direct current bidirectional electric energy conversion is realized; the direct-current power conversion circuit realizes direct-current-direct-current bidirectional electric energy conversion and comprises a plurality of bridge arm modules and a plurality of substrates, wherein each switch device in each bridge arm module is switched on or switched off based on a corresponding driving signal; two ends of each bridge arm module are used for being connected with a direct current bus, and the output end of each bridge arm module is used for being connected with a second power supply/load; all the bridge arm modules with parallel output ends are integrated on the same substrate. According to the direct-current power supply provided by the embodiment of the invention, through adjusting the number of the parallel bridge arm modules, the flexible expansibility of the capacity of the direct-current power supply can be improved while the better current sharing characteristic among the parallel bridge arm modules is ensured.
Description
Technical Field
The embodiment of the invention relates to the technical field of power electronics, in particular to a direct-current power supply.
Background
With the popularization of new energy concepts, new energy devices such as mobile terminals, electric vehicles, energy storage power stations and the like are continuously developed. The power battery as an important component of the new energy is a key factor for determining the portability, the cruising ability and the energy storage capacity of the new energy equipment, and the electrical characteristics of the power battery play a crucial role in the new energy equipment.
In order to ensure the reliable operation of the power battery, the electric core of the power battery needs to be tested comprehensively and effectively. Firstly, a test power supply of a power battery cell has low-voltage and high-current characteristics. Secondly, for the battery cores with different capacities, the test power supply needs to have different rated output current capacities. In addition, considering the extreme application of power batteries, particularly the testing of battery boundary characteristics such as battery short-circuiting, rapid charging or discharging, which are related to battery safety, the test power supply is required to have a current bi-directional, high dynamic, high precision output control capability.
In order to meet the requirement of testing the battery core, most of the current testing power supplies adopt the technical scheme that switching devices based on conventional low current capacity are directly connected in parallel and matched with a proper control strategy to realize steady-state and dynamic characteristics. In the scheme, the current sharing characteristic of the parallel switch devices completely depends on device parameters, circuit stray parameters and driving loop characteristics, and the port voltage and current of each switch device cannot be directly measured, so that the controllability of the test power supply is reduced to a great extent.
Disclosure of Invention
The embodiment of the invention provides a direct-current power supply, which is used for solving the problems of poor current-sharing characteristic, low controllability and poor expandability of the conventional test power supply.
The embodiment of the invention provides a direct current power supply, which comprises a rectifying circuit and a direct current power conversion circuit;
the input end of the rectifying circuit is used for being connected with a first power supply/load, the output end of the rectifying circuit is used as a direct current bus to be connected with the input end of the direct current power conversion circuit, and the rectifying circuit realizes alternating current-direct current bidirectional electric energy conversion;
the direct-current power conversion circuit realizes direct-current-direct-current bidirectional electric energy conversion and comprises a plurality of bridge arm modules and a plurality of substrates, wherein each switch device in each bridge arm module is switched on or switched off based on a corresponding driving signal; two ends of each bridge arm module are used for being connected with the direct current bus, and the output end of each bridge arm module is used for being connected with a second power supply/load; and all the bridge arm modules with the output ends connected in parallel are integrated on the same substrate.
According to the direct-current power supply provided by the embodiment of the invention, all bridge arm modules with parallel output ends are integrated on the same substrate, so that the temperature balance of switching devices contained in each bridge arm module can be ensured, the external factors such as the area of a current conversion loop are the same as much as possible, and the current sharing characteristic among the parallel bridge arm modules is optimized. Each bridge arm module has independence, and for a single bridge arm module, the port voltage of each switching device in the bridge arm module and the output current of the bridge arm module can be independently measured, so that the controllability of the direct-current power conversion circuit is enhanced. In addition, the requirements of different power supply capacities can be met only by adjusting the number of parallel bridge arm modules contained in the direct current power conversion circuit, and the structure expansibility is strong and the flexibility is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is also possible for those skilled in the art to obtain the rest of the drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a dc power supply according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a dc power conversion circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dc power conversion circuit according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a bridge arm module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a substrate integrated with a plurality of bridge arm modules according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a substrate mounted with a heat dissipation module according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a dc power conversion circuit according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a dc power supply according to another embodiment of the invention;
fig. 9 is a schematic structural diagram of a dc power supply according to another embodiment of the invention;
fig. 10 is a schematic structural diagram of a dc power supply according to yet another embodiment of the invention;
description of reference numerals:
1-bridge arm module; 1 a-a first port; 1 b-a second port;
1 c-an output; 11-power bridge arm; 12-a direct current support capacitor;
13-a drive module; 14-a filter inductance; 15-a filter capacitor;
16-a direct current bus; 21-a first power source/load; 22-a second power source/load;
3-a substrate; 4-a rectifying circuit; 5-a direct current power conversion circuit;
61-a first switch; 62-a second switch; 7-a control module;
8-a detection module; 9-a filter capacitor; 10-heat dissipation module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of the present invention.
According to the direct-current power conversion circuit constructed based on the technical scheme that the plurality of small-capacity switching devices are directly connected in parallel, the current sharing characteristics of the switching devices are completely dependent on device parameters, circuit stray parameters and driving loop characteristics, the current sharing characteristics are poor, and controllability is low. In order to solve the above problem, an embodiment of the present invention provides a dc power conversion circuit, which provides a test power supply with good current sharing characteristics and strong controllability for testing a power battery cell. It should be noted that the direct-current power supply provided by the embodiment of the invention can be used not only for testing power supplies, but also in the application fields of intelligent terminals, electric vehicles, energy storage power stations and the like. Fig. 1 is a schematic structural diagram of a dc power supply according to an embodiment of the present invention, and as shown in fig. 1, the dc power supply includes a rectifying circuit 4 and a dc power converting circuit 5; the input end of the rectifying circuit 4 is used for being connected with a first power supply/load 21, the output end of the rectifying circuit 4 is used as a direct current bus 16 to be connected with the input end of the direct current power conversion circuit 5, and the rectifying circuit is used for realizing alternating current-direct current bidirectional electric energy conversion; the direct current power conversion circuit 5 realizes direct current-direct current bidirectional electric energy conversion and comprises a plurality of bridge arm modules 1 and a plurality of substrates 3, wherein each switch device in each bridge arm module 1 is switched on or switched off based on a corresponding driving signal; two ends of each bridge arm module 1 are used for being connected with a direct current bus 16, and an output end 1c of each bridge arm module 1 is used for being connected with a second power supply/load 22; all the bridge arm modules 1 with the output ends 1c connected in parallel are integrated on the same substrate 3.
Specifically, in the dc power supply, the first power supply/load 21 is an ac power supply, the first power supply/load 21 is connected to the rectifier circuit 4, and the rectifier circuit 4 rectifies the ac power output from the first power supply/load 21 and uses the rectified dc power as the dc bus of the dc power conversion circuit 5. The dc power conversion circuit 5 performs dc-dc conversion on the dc power input from the rectifying circuit 4, and outputs the dc power to the second power supply/load 22. In addition, when the first power supply/load 21 is an ac load, the dc power conversion circuit 5 may perform dc-dc conversion on the dc power input from the second power supply/load 22, output the dc power, and input the dc power to the rectifier circuit 4. The rectifier circuit 4 may invert the dc power inputted in the reverse direction, convert the dc power into ac power, and output the ac power to the first power supply/load 21. For example, the first power/load 21 is ac 220V or 380V commercial power. The rectifying circuit 4 converts the input ac power into low-voltage dc power based on a bridge high-frequency synchronous rectification method, and supplies a dc bus voltage to the subsequent dc power conversion circuit 5, and the dc power conversion circuit 5 voltage-regulates and converts the low-voltage dc power on the dc bus 16 into dc power required by the second power supply/load 22. Meanwhile, the dc power conversion circuit 5 may invert the dc power of the second power supply/load 22 to the dc bus 16, and the rectifier circuit 4 may invert the low-voltage dc power of the dc bus 16 to the ac power of the first power supply/load 21. The rectifier circuit 4 may be packaged separately as a module.
The direct current power conversion circuit 5 includes a plurality of bridge arm modules 1, where each bridge arm module 1 is a power conversion module capable of operating independently, and the bridge arm module 1 includes a plurality of switching devices, and each switching device can be turned on or off under the control of a corresponding driving signal. For the sake of convenience of distinction, both ends of the bridge arm module 1 are referred to as a first port 1a and a second port 1 b. Here, the switching device may be a Transistor and a diode based on an Insulated Gate Bipolar Transistor (IGBT) based on Si, SiC, or GaN, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), a junction Field-Effect Transistor (JFET), or the like, and the embodiment of the present invention is not particularly limited thereto. Because each bridge arm module 1 has independence, the port voltage and the port current of each switching device in the bridge arm module 1 can be directly and independently measured for a single bridge arm module 1.
The dc bus 16 and the second power/load 22 may be respectively connected to two ends of the dc power conversion circuit 5, the dc power conversion circuit 5 may implement bidirectional power conversion between the dc bus 16 and the second power/load 22, and may implement conversion of power from the dc bus 16 to the second power/load 22 by using the dc bus 16 as an input power and the second power/load 22 as a load; or the dc bus 16 is used as a load and the second power supply/load 22 is used as a power supply, so that the conversion of the electric energy from the second power supply/load 22 to the dc bus 16 is realized. It should be noted that the second power source/load 22 may be one or more power sources and loads, that is, in the dc power conversion circuit 5, different bridge arm modules 1 may be connected to different second power sources/loads 22, so as to implement power conversion between the different second power sources/loads 22 and the dc bus 16. Further, two ends of each bridge arm module 1, i.e. the first port 1a and the second port 1b, are used for connecting with two ends of the dc bus 16, and the output end 1c of each bridge arm module 1 is used for connecting with one end of the second power/load 22. When the output end 1c of the bridge arm module 1 is connected with the second power/load 22, the bridge arm module 1 which needs to be connected with the same second power/load 22 in the direct current power conversion circuit 5 can be equally divided into two parts, the output end 1c of one part of the bridge arm module 1 is connected with one end of the second power/load 22 after being connected in parallel, the output end 1c of the other part of the bridge arm module 1 is connected with the other end of the same second power/load 22 after being connected in parallel, all the bridge arm modules 1 which need to be connected with the second power/load 22 in the direct current power conversion circuit 5 can be taken as a whole, the output ends 1c of all the bridge arm modules 1 are connected with one end of the second power/load 22 after being connected in parallel, the first ports 1a or the second ports 1b of all the bridge arm modules 1 are connected with the other end of the second power/load 22 after being connected in parallel, the embodiment of the present invention is not particularly limited thereto.
In the direct current power conversion circuit 5, the bridge arm modules 1 are all integrated on the substrate 3, and the bridge arm modules 1 integrated on the substrate 3 are independent from each other and are not electrically connected, so that the capacity expansion of the direct current power conversion circuit 5 is more flexible by being helpful for adjusting the number of the bridge arm modules 1 contained in the direct current power conversion circuit 5 in real time according to different power supply capacity requirements. In order to optimize the current sharing characteristic of the dc power conversion circuit, the substrate 3 may be made of a material with good thermal conductivity, such as an aluminum substrate or a copper substrate, and provides physical support and a local conductive circuit for the bridge arm modules 1, and at the same time, plays a good role in heat conduction, so as to ensure that external factors such as the temperature balance of the switching devices included in each bridge arm module 1 integrated on the same substrate 3, the area of the current conversion loop, and the like are the same as much as possible, and create conditions for realizing good current sharing of the parallel branches.
In order to further optimize the current sharing characteristic of the dc power conversion circuit 5, it is necessary to ensure that all the bridge arm modules 1 with the output ends 1c connected in parallel are integrated on the same substrate 3, so that the temperatures of the switching devices included in the two bridge arm modules 1 are balanced, and the external factors such as the area of the current conversion loop are the same as much as possible. It should be noted that all the bridge arm modules 1 with the output ends 1c connected in parallel are used as a group of parallel bridge arm modules, each bridge arm module 1 in the group of parallel bridge arm modules needs to be integrated on the same substrate 3, and multiple groups of parallel bridge arm modules can be integrated on any substrate 3 at the same time.
In the direct-current power supply provided by the embodiment of the invention, all the bridge arm modules with the output ends connected in parallel are integrated on the same substrate, so that the temperature balance of the switching devices contained in each bridge arm module can be ensured, the areas of the current conversion loops and other external factors are the same as much as possible, and the current sharing characteristic among the parallel bridge arm modules is optimized. Each bridge arm module has independence, and for a single bridge arm module, the port voltage and the port current of each switching device in the bridge arm module can be measured independently, so that the controllability of the direct-current power conversion circuit is enhanced. In addition, the requirements of different power supply capacities can be met only by adjusting the number of parallel bridge arm modules contained in the direct current power conversion circuit, and the structure expansibility is strong and the flexibility is high.
Based on the foregoing embodiment, fig. 2 is a schematic structural diagram of a dc power conversion circuit provided in an embodiment of the present invention, and as shown in fig. 2, in the dc power conversion circuit, output terminals 1c of a part of bridge arm modules 1 are connected in parallel and then connected to one end of a second power supply/load 22, and output terminals 1c of another part of bridge arm modules 1 are connected in parallel and then connected to the other end of the second power supply/load 22; one part of the bridge arm modules 1 is integrated on any one of the substrates 3, and the other part of the bridge arm modules 1 is integrated on the substrate 3 or the other substrate 3.
Specifically, the bridge arm module 1 in the dc power conversion circuit is equally divided into two parts, i.e., two groups of parallel bridge arm modules. The output ends 1c of the two parallel bridge arm modules are respectively connected in parallel and then connected with two ends of a second power supply/load 22, so as to be used as a parallel connection mode of each bridge arm module 1. The two sets of parallel bridge arm modules may be integrated on the same substrate 3, or may be integrated on two substrates 3, respectively. For example, the dc power conversion circuit in fig. 2 includes two substrates 3, and each substrate 3 has a set of parallel bridge arm modules integrated thereon.
Based on any of the above embodiments, fig. 3 is a schematic structural diagram of a dc power conversion circuit according to another embodiment of the present invention, as shown in fig. 3, output ends 1c of all bridge arm modules 1 in the dc power conversion circuit are connected in parallel and then connected to one end of a second power supply/load 22, and one end of all bridge arm modules 1 is connected in parallel and then connected to the other end of the second power supply/load 22; each bridge arm module 1 is integrated on the same substrate 3.
Specifically, all the bridge arm modules 1 in the dc power conversion circuit are used as a set of parallel bridge arm modules, the output terminals 1c of all the bridge arm modules 1 are connected in parallel and then connected to one end of the second power supply/load 22, and the first ports 1a or the second ports 1b of all the bridge arm modules 1 are connected in parallel and then connected to the other end of the second power supply/load 22, which is used as another parallel connection mode of each bridge arm module 1. All the bridge arm modules 1 in the direct current power conversion circuit based on the parallel connection mode are integrated on the same substrate 3. In fig. 3, the second port 1b of each bridge arm module 1 is connected to both one end of the dc bus 16 and one end of the second power source/load 22. In addition, the first ports 1a of all the bridge arm modules 1 in the dc power conversion circuit may be simultaneously connected to one end of the dc bus 16 and one end of the second power supply/load 22, which is not particularly limited in the embodiment of the present invention.
Fig. 2 and 3 provide two output parallel connection modes of the bridge arm modules, provide an integration mode of the corresponding bridge arm modules 1 for different parallel connection modes, and optimize the current sharing characteristic of the parallel bridge arm modules by integrating each bridge arm module 1 in a group of parallel bridge arm modules on the same substrate 3. Therefore, the direct current power conversion circuit can realize the flexible adjustment of the current capacity by changing the number of the bridge arm modules 1, can realize the adjustment of different output modes by changing the output parallel connection mode of the bridge arm modules 1, and further improves the flexibility of the direct current power supply.
For example, when the demand for output current capacity is large, all the bridge arm modules integrated on each substrate in the dc power conversion circuit are used as a group of parallel bridge arm modules, and the output ends of the two groups of parallel bridge arm modules are used as two output ports of the dc power conversion circuit, that is, the dc power conversion circuit includes two layers of substrates. When the output current capacity requirement is small, each substrate corresponds to one group of direct current power conversion circuits, the bridge arm modules integrated on each substrate are averagely divided into two groups of parallel bridge arm modules which are respectively connected in parallel to form two output ports of the direct current power conversion circuits.
Based on any one of the above embodiments, fig. 4 is a schematic structural diagram of a bridge arm module provided in an embodiment of the present invention, as shown in fig. 4, in a dc power supply, the bridge arm module includes a power bridge arm 11, and further includes at least one of a dc support capacitor 12, a driving module 13, and a filter inductor 14; the direct current support capacitor 12 is connected in parallel with the power bridge arm 11; the driving module 13 is connected with the driving end of each switching device in the power bridge arm 11, and the driving module 13 is used for providing a corresponding driving signal for each switching device; filter inductor 14 is connected between output terminal 1c of power leg 11 and second power supply/load 22 for smoothing the power leg current.
Specifically, for any bridge arm module, the bridge arm module includes a power bridge arm 11 for implementing power conversion, the power bridge arm 11 includes a plurality of switching devices, and each switching device can be turned on or off under the control of a corresponding driving signal. The power bridge arm 11 may be a half-bridge arm, or may be an active output end clamp bridge arm, an output end clamp bridge arm, a flying capacitor bridge arm, or a T-type bridge arm, which is not specifically limited in this embodiment of the present invention.
In addition, the bridge arm module further includes a direct current support capacitor 12, the direct current support capacitor 12 may be formed by connecting a single capacitor or a plurality of discrete capacitors, and a capacitor bank in parallel, two ends of the direct current support capacitor 12 are respectively connected to two ends of the power bridge arm 11 and are connected in parallel with the power bridge arm 11, and the direct current support capacitor 12 is used for filtering and storing energy.
The bridge arm module further includes a driving module 13, and the driving module 13 is connected to a driving end of each switching device in the power bridge arm 11, and isolates and converts an externally input control signal into a power signal, i.e., a driving signal, for driving the corresponding switching device. It should be noted that each switching device in the power bridge arm 11 corresponds to an isolated and independent driving signal.
The bridge arm module further comprises a filter inductor 14, and the filter inductor 14 is connected between the output end 1c of the power bridge arm 11 and the second power supply/load 22. Under the condition that the filter inductor 14 exists in the bridge arm module, one end of the filter inductor 14 is connected with the midpoint of the power bridge arm 11, and the other end is the output end 1c of the bridge arm module and is connected with the second power supply/load 22. The filter inductor 14 may be a discrete inductor or a branch inductor of the coupling inductor, which is not particularly limited in this embodiment of the present invention. In addition, the bridge arm module may not include the filter inductor 14, but a branch inductor of the coupling inductor corresponding to each bridge arm module is independently arranged outside the substrate 3, so that the size of the bridge arm module is reduced, and the power density of the bridge arm module and even the substrate 3 is improved.
For example, fig. 5 is a schematic structural diagram of a substrate integrating a plurality of bridge arm modules according to an embodiment of the present invention, and as shown in fig. 5, 6 bridge arm modules 1 are integrated on a substrate 3. The dotted square shows the area of any one of the bridge arm modules 1, which includes a first port 1a, a second port 1b, an output end 1c, a power bridge arm 11, and a dc support capacitor 12. And a driving module is also arranged in the area where the power bridge arm 11 is arranged. And the filter inductor corresponding to the bridge arm module is arranged outside the substrate.
Based on any of the above embodiments, the dc power supply further comprises a detection module and a control module; the detection module comprises a sensing device and a conditioning circuit, wherein the sensing device is used for measuring at least one electrical parameter of a first power supply/load, a direct-current bus, a bridge arm module and a second power supply/load to obtain a detection quantity; the conditioning circuit is used for conditioning the detection quantity and transmitting the conditioned detection quantity to the control module; the control module is used for outputting a control signal of each switching device in each bridge arm module based on the conditioned detection quantity and the power conversion requirement, and transmitting the control signal to the corresponding driving module in the bridge arm module, so that the driving module can generate a driving signal based on the control signal and control the on and off of the switching devices.
Specifically, the sensing device may be a voltage sensor, a current sensor, or the like for measuring an electrical parameter of at least one of the first power source/load, the dc bus, the bridge arm module, and the second power source/load, and the electrical parameter may be an input voltage, an input current, an output voltage, an output current, an intermediate-stage voltage and current, or the like. After the sensing device measures the detection quantity of the electrical parameters, the detection quantity is transmitted to the conditioning circuit, and after the conditioning circuit conditions the detection quantity, the conditioned detection quantity is transmitted to the control module. The control module can perform closed-loop control on the direct current power conversion circuit according to the conditioned detection quantity and the power conversion requirement, generate a control signal corresponding to each switching device in each bridge arm module, and send the control signal corresponding to each bridge arm module to the driving module contained in the bridge arm module. After receiving the control signal provided by the control module, the driving module isolates and converts the control signal into a power signal, i.e., a driving signal, for driving the corresponding switching device. Here, the power conversion requirement may be an index such as output voltage and current accuracy, dynamic response characteristics, and a power conversion direction.
Based on any of the above embodiments, the control signal output by the control module for each bridge arm module is a synchronous control signal or a phase-shift control signal.
Specifically, the control module can realize effective control of the switching devices in each bridge arm module in the dc power conversion circuit and control of the quality of the electric energy output by the dc power conversion circuit on the basis of the detection module and the driving module. Furthermore, the control module can control the switching devices in each bridge arm module by adopting the same strictly synchronous control signal, namely the synchronous control signal, so that each bridge arm module performs electric energy conversion in the same working mode to obtain a better parallel branch current equalizing effect; the control module can also control the switching devices in each bridge arm module by adopting phase-shifting control signals, for example, the control signal of the switching device of any bridge arm module can be obtained by the control signal of the switching device of the other bridge arm module after certain time delay, the control signals of the switching devices of adjacent bridge arm modules have specific phase difference in sequence, and each parallel bridge arm module performs electric energy conversion in a staggered working mode to realize output harmonic wave cancellation and high fault redundancy control.
In addition, the direct current power supply can also comprise an auxiliary power supply which is used for supplying power to the driving module, the detection module and the control module in the rectifying circuit and the direct current conversion circuit.
Based on any of the above embodiments, fig. 6 is a schematic structural diagram of the substrate mounted with the heat dissipation module according to the embodiment of the present invention, as shown in fig. 6, the dc power supply further includes a heat dissipation module 10, and the heat dissipation module 10 is closely attached to the back surface of each substrate 3.
Specifically, the back surface of the substrate 3 refers to the back surface of the side of the substrate 3 on which the arm module is integrated. The substrate 3 provides physical support and local conductive circuits for the bridge arm module, and simultaneously plays a good role in heat conduction, heat generated by the switch device is conducted to the heat dissipation module 10, and the heat dissipation module 10 dissipates the heat to the environment. In addition, a heat-conducting medium with high heat conductivity coefficient, such as heat-conducting silicone grease or a heat-conducting rubber pad, is uniformly added between the back surface of the substrate 3 and the heat dissipation module 10, so that a contact gap between the attachment surfaces of the substrate 3 and the heat dissipation module 10 can be eliminated.
According to the size of the heat loss, the heat dissipation module can adopt natural air cooling, forced air cooling, heat pipe heat dissipation or water cooling and the like. The natural air cooling of the heat dissipation module is to cool the heat dissipation module by using natural air. The forced air cooling of the heat dissipation module requires a fan to be installed on the side surface of the heat dissipation module to blow or suction air on the surface of the heat dissipation module, and the cooling of the heat dissipation module is accelerated by utilizing the convection effect. The heat pipe heat dissipation is to conduct the heat on the heat dissipation module to the direct current power supply shell or other heat dissipation surfaces through the heat pipe to achieve heat dissipation. The heat dissipation module is water-cooled, and a water cooling device is required to be closely attached to the heat dissipation module, so that heat is taken away through cooling water by utilizing heat conduction between the heat dissipation module and the water cooling device.
According to the direct-current power supply provided by the embodiment of the invention, the uniform ambient temperature of the parallel bridge arm modules integrated on the same substrate is ensured through the surface mounting heat dissipation module, so that the current sharing control is facilitated.
Based on any of the above embodiments, the dc power supply further includes a filter capacitor, and the filter capacitor is connected in parallel with the second power supply/load. Specifically, a filter capacitor is connected in parallel with the connecting end of the direct current power conversion circuit and the second source/load, so that the voltage can be effectively and smoothly output, and the quality of output electric energy is improved.
Fig. 7 is a schematic structural diagram of a dc power conversion circuit according to another embodiment of the present invention, as shown in fig. 7, the dc power conversion circuit includes a plurality of bridge arm modules 1, each bridge arm module 1 includes a dc support capacitor 12 and a power bridge arm 11, where the power bridge arm 11 is a half-bridge arm, and each bridge arm module 1 is correspondingly provided with a filter inductor 14 connected to an output end 1c of the half-bridge arm. The output ends 1c of two bridge arm modules 1 in the direct current power conversion circuit are respectively connected with a filter inductor 14 and then connected in parallel to form two output ports of the direct current power conversion circuit, and a filter capacitor 15 is connected between the two output ports of the direct current power conversion circuit in parallel.
According to any of the above embodiments, the dc power supply further comprises a first switch and/or a second switch; the first switch is arranged between the first power supply/load and the rectifying circuit, and the second switch is arranged between the filter capacitor and the second power supply/load. The first switch is used for controlling the on-off of the electrical connection between the direct current power supply and the first power supply/load, and the second switch is used for controlling the on-off of the electrical connection between the direct current power supply and the second power supply/load.
For example, fig. 8 is a schematic structural diagram of a dc power supply according to another embodiment of the present invention, and as shown in fig. 8, a first switch 61 is disposed between a first power supply/load 21 and a rectifying circuit 4, and a second switch 62 is disposed between a dc power conversion circuit 5 and a second power supply/load 22. A voltage sensing device is connected in parallel between the rectification circuit 4 and the direct current power conversion circuit 5 and used for collecting direct current bus voltage, a voltage sensing device is connected in parallel between the direct current power conversion circuit 5 and the second power supply/load 22 and used for collecting output voltage, and a current sensing device is connected in series on a loop between the direct current power conversion circuit 5 and the second power supply/load 22 and used for collecting output current. The dc bus voltage, the output voltage, and the output current are conditioned and transmitted to the control module, and the control module is configured to output a control signal of each switching device in each bridge arm module in the dc power conversion circuit 5 based on the parameters and the power conversion requirement, so as to control the dc power conversion circuit 5.
Fig. 9 is a schematic structural diagram of a dc power supply according to still another embodiment of the present invention, and as shown in fig. 9, 6 bridge arm modules 1 are integrated on a substrate 3 of the dc power supply, and a first port 1a and a second port 1b of each bridge arm module 1 are connected to two ends of a positive dc bus 16 and a negative dc bus 16. One end of each filter inductor in each 3 bridge arm modules 1 on the substrate 3 is used as an output end to be connected in parallel to form two groups of parallel bridge arm modules. The filter capacitor 9 is bridged on the output ends of the two groups of parallel bridge arm modules, and the output ends of the parallel bridge arm modules are also respectively connected with the detection module 8 and the second switch 62. Each substrate 3 and its corresponding filter inductor 14, filter capacitor 9, detection module 8 and second switch 62 form a power channel, which is connected to a second power/load 22. The entire dc power supply may contain multiple power channels.
Fig. 10 is a schematic structural diagram of a dc power supply according to still another embodiment of the present invention, as shown in fig. 10, each substrate 3 is integrated with 6 bridge arm modules 1, first ports 1a and second ports 1b of all the bridge arm modules 1 are respectively connected to two ends of a positive dc bus 16 and a negative dc bus 16, and one end of each filter inductor in all the bridge arm modules 1 is connected in parallel as an output end to form a group of parallel bridge arm modules. The filter capacitors 9 are connected in parallel between the output ends of the two groups of parallel bridge arm modules corresponding to the two substrates 3, and the output ends of the parallel bridge arm modules are further connected with the detection module 8 and the second switch 62 respectively. The two substrates 3 and their corresponding filter inductors 14, filter capacitors 9, detection modules 8 and second switches 62 form a power channel, which is connected to a second power/load 22.
Based on any one of the above embodiments, the dc power supply further includes a case, the rectifying circuit and the dc power converting circuit are disposed inside the case; any two opposite surfaces of the box body can be respectively provided with an air duct inlet and an air duct outlet.
Specifically, the air duct inlet and the air duct outlet are respectively arranged on any two opposite surfaces of the box body, so that heat generated by power conversion in the box body can be rapidly dissipated out of the box body, and stable operation of the rectifying circuit and the direct current power conversion circuit in the box body is ensured.
Based on any one of the embodiments, the direct current power supply adopts two-stage electric energy conversion of alternating current-direct current and direct current-direct current. The alternating current-direct current conversion, namely a rectifying circuit adopts bridge type high-frequency rectification to realize bidirectional electric energy conversion from alternating current to low-voltage direct current bus voltage. The direct current-direct current conversion, namely the direct current power conversion circuit adopts a multi-bridge arm module parallel structure, realizes the bidirectional electric energy conversion between the direct current bus voltage and the load voltage, and simultaneously realizes the accurate control of different output currents by connecting a plurality of bridge arm modules in parallel. A plurality of independent and parallel bridge arm modules are integrated on the same substrate, so that a good current equalizing effect is obtained. The auxiliary power supply provides an auxiliary direct current power supply for the whole design. The control module is used for realizing conversion control of target command voltage and target command current. The detection module realizes the detection of the electrical parameters. Further, the control module may further include a control panel, and the control panel is configured to receive the issued control instruction, and generate a control signal of the switching device of each bridge arm module based on the control instruction and the closed-loop calculation of the electrical parameter, so as to obtain a target voltage and a target current at the output side. In addition, the control module may be further configured to control the first switch and the second switch.
The direct current power supply is designed to adopt a box body type structure, and the front surface of the box body comprises a state indication, an operation interface and an air duct inlet; the back is an air duct outlet; the four side surfaces are closed surfaces. The left side and the right side in the box body are respectively provided with a rectifying circuit, an auxiliary power supply, a control module, a detection module and other auxiliary circuits, and the middle part is provided with a direct current power conversion circuit. The direct current power conversion circuit adopts a multi-power-channel parallel laminated structure, and each power channel comprises a substrate integrated with a multi-bridge-arm module, a filter inductor, a filter capacitor and a heat dissipation module. Each power channel forms a direct current power supply output.
According to the direct-current power supply provided by the embodiment of the invention, all the bridge arm modules with the output ends connected in parallel in the direct-current power conversion circuit are integrated on the same substrate, so that the temperature balance of the switching devices contained in each bridge arm module can be ensured, the external factors such as the area of a current conversion loop and the like are the same as much as possible, and the current sharing characteristic of the direct-current power conversion circuit is optimized. And each bridge arm module has independence, the port voltage and the port current of each switching device in the bridge arm module can be independently measured aiming at a single bridge arm module, and the controllability of the direct-current power conversion circuit is enhanced. In addition, the requirements of different power supply capacities can be met only by adjusting the number of parallel bridge arm modules contained in the direct current power conversion circuit, and the structure expansibility is strong and the flexibility is high.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A direct current power supply is characterized by comprising a rectifying circuit and a direct current power conversion circuit;
the input end of the rectifying circuit is used for being connected with a first power supply/load, the output end of the rectifying circuit is used as a direct current bus to be connected with the input end of the direct current power conversion circuit, and the rectifying circuit realizes alternating current-direct current bidirectional electric energy conversion;
the direct-current power conversion circuit realizes direct-current-direct-current bidirectional electric energy conversion and comprises a plurality of bridge arm modules and a plurality of substrates, wherein each switch device in each bridge arm module is switched on or switched off based on a corresponding driving signal; two ends of each bridge arm module are used for being connected with the direct current bus, and the output end of each bridge arm module is used for being connected with a second power supply/load; all the bridge arm modules with the output ends connected in parallel are integrated on the same substrate; the number of the bridge arm modules is adjusted in real time according to the capacity requirement of the power supply;
the output ends of one part of the bridge arm modules in the direct current power conversion circuit are connected in parallel and then are connected with one end of the second power supply/load, and the output ends of the other part of the bridge arm modules in the direct current power conversion circuit are connected in parallel and then are connected with the other end of the second power supply/load;
one part of bridge arm modules are integrated on any one substrate, and the other part of bridge arm modules are integrated on the other substrate;
the bridge arm module comprises a power bridge arm and a driving module;
the driving module is connected with the driving end of each switching device in the power bridge arm, and the driving module is used for providing corresponding driving signals for each switching device.
2. The direct current power supply of claim 1, wherein the bridge arm module further comprises a direct current support capacitor and/or a filter inductor;
the direct current support capacitor is connected with the power bridge arm in parallel;
the filter inductor is connected between the midpoint of the power bridge arm and the second power supply/load.
3. The direct current power supply according to claim 2, further comprising a detection module and a control module;
the detection module comprises a sensing device and a conditioning circuit, wherein the sensing device is used for measuring at least one electrical parameter of the first power supply/load, the direct-current bus, the bridge arm module and the second power supply/load to obtain a detection quantity; the conditioning circuit is used for conditioning the detection quantity and transmitting the conditioned detection quantity to the control module;
the control module is used for outputting a control signal of each switching device in each bridge arm module based on the conditioned detection quantity and the power conversion requirement, and transmitting the control signal to the corresponding driving module in the bridge arm module, so that the driving module can generate the driving signal based on the control signal.
4. The DC power supply of claim 3, wherein the control signal output by the control module for each bridge arm module is a synchronous control signal or a phase-shifted control signal.
5. The DC power supply according to any one of claims 1 to 4, further comprising a heat dissipation module closely attached to a back surface of each of the substrates; the heat dissipation module adopts a heat dissipation mode including at least one of natural air cooling, forced air cooling, heat pipe heat dissipation and water cooling heat dissipation.
6. The DC power supply of any of claims 1 to 4, further comprising a filter capacitor connected in parallel with the second power supply/load.
7. The direct current power supply according to claim 6, further comprising a first switch and/or a second switch;
the first switch is disposed between the first power supply/load and the rectifier circuit, and the second switch is disposed between the filter capacitor and the second power supply/load.
8. The direct current power supply according to any one of claims 1 to 4, further comprising a case, the rectification circuit and the direct current power conversion circuit being provided inside the case; any two opposite surfaces of the box body are respectively provided with an air duct inlet and an air duct outlet.
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| CN201910242595.4A CN109980956B (en) | 2019-03-28 | 2019-03-28 | Direct current power supply |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206059378U (en) * | 2016-06-17 | 2017-03-29 | 扬州国扬电子有限公司 | A kind of compact type full bridge power module |
| CN107579658A (en) * | 2017-11-03 | 2018-01-12 | 苏州共元自控技术有限公司 | A kind of two-way DC/DC dc sources of low-voltage, high-current that can be in parallel |
| CN108712075A (en) * | 2018-06-21 | 2018-10-26 | 哈尔滨理工大学 | A kind of high-gain fuel cell car DC/DC transformer configurations and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103997246A (en) * | 2014-05-08 | 2014-08-20 | 东北电力大学 | Bidirectional photovoltaic inverter based on high-frequency legs |
| CN207410224U (en) * | 2017-11-03 | 2018-05-25 | 苏州共元自控技术有限公司 | A kind of two-way DC/DC DC power supplies of low-voltage, high-current that can be in parallel |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206059378U (en) * | 2016-06-17 | 2017-03-29 | 扬州国扬电子有限公司 | A kind of compact type full bridge power module |
| CN107579658A (en) * | 2017-11-03 | 2018-01-12 | 苏州共元自控技术有限公司 | A kind of two-way DC/DC dc sources of low-voltage, high-current that can be in parallel |
| CN108712075A (en) * | 2018-06-21 | 2018-10-26 | 哈尔滨理工大学 | A kind of high-gain fuel cell car DC/DC transformer configurations and control method |
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