CN213185893U - Bidirectional isolation type DC-DC buck-boost rectification power supply module - Google Patents
Bidirectional isolation type DC-DC buck-boost rectification power supply module Download PDFInfo
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- CN213185893U CN213185893U CN202022343714.6U CN202022343714U CN213185893U CN 213185893 U CN213185893 U CN 213185893U CN 202022343714 U CN202022343714 U CN 202022343714U CN 213185893 U CN213185893 U CN 213185893U
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Abstract
The utility model discloses a bidirectional isolation type DC-DC Buck-boost rectification power supply module, which relates to the technical field of converters and mainly comprises a DC/DC chopping up-down module, a bidirectional isolation DC/DC conversion unit module and a filter circuit, wherein the power generation characteristics of a direct current micro-grid and a hydrogen fuel cell are passed through, the grid-connected DC/DC module jointly constructs a mixed-lapping type bidirectional isolation DC/DC converter module by a bidirectional non-isolation converter composed of Bboot and Buck and a bidirectional isolation type DC/DC converter, the DC/DC conversion of the direct current voltage generated by the hydrogen fuel power generation can be realized, the DC/DC conversion of power equipment can also be used for realizing the direct current voltage regulation and control of an energy storage system battery of the direct current micro-grid, an H bridge PWM inversion unit in the bidirectional isolation DC/DC conversion unit module inversely changes a direct current power supply into PWM high-frequency alternating square wave pulse, the power module has the function of bidirectional DC/DC power conversion and has the characteristic of input/output electrical isolation.
Description
Technical Field
The utility model relates to a converter technical field, concretely relates to two-way isolated form DC-DC buck-boost rectification power module.
Background
The DC/DC converter technology is used for converting non-adjustable DC voltage into adjustable or fixed DC voltage, is a technology for efficiently controlling electric energy conversion in a switching condition mode, and is applied to various distributed power systems, solar power supplies, fuel cells, switching power supplies and DC speed regulation systems at present.
At present, hydrogen energy is abundant as a resource and wide in application, and is pollution-free in the processes of hydrogen production and hydrogen fuel generation, and the hydrogen energy belongs to a high-quality new energy.
Therefore, how to solve the problems is to realize the adaptation and application of the DC/DC converter to the output power supply and the direct current power supply with unstable power, and the solution of the system is provided for the engineering application from hydrogen energy power generation to an electric system, which has very important significance.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a two-way isolated form DC-DC Buck-boost rectification power module, through to the little electric wire netting of direct current, hydrogen fuel cell power generation characteristic, the DC/DC module that is incorporated into the power networks, energy storage battery charge-discharge DC/DC module, the research of power consumption DC/DC transform module, it constructs a two-way isolation converter and two-way isolated form DC/DC converter module of mixed type jointly with the two-way non-isolation converter that Bboot and Buck are constituteed to propose one kind, can be used for the DC/DC transform of the direct current voltage that hydrogen fuel power generation produced, the DC/DC transform that also can be used to the consumer can also realize the direct current voltage regulation and control of the energy storage system battery of the little electric wire netting of direct current.
The utility model discloses a following technical scheme realizes:
a bidirectional isolation type DC-DC buck-boost rectification power supply module is characterized by comprising a DC power supply, a DC/DC chopping up-down module, a bidirectional isolation DC/DC conversion unit module, a filter circuit and load equipment; the DC power supply inputs direct-current voltage to the DC/DC chopping lifting module to regulate and control the direct-current voltage, and then the direct-current voltage flows into the filter circuit for processing after being isolated and rectified along the bidirectional isolation DC/DC conversion unit module to obtain stable direct-current voltage which flows into load equipment to supply power for the load equipment; the DC/DC Buck-Boost rectification power supply module comprises a Boost circuit and a Buck circuit; when the input power supply of the DC power supply is higher than the voltage of the load equipment, the DC power supply is used for chopping and boosting the input direct-current voltage, and when the input power supply of the DC power supply is higher than the voltage of the load equipment, the DC power supply is used for chopping and reducing the input direct-current voltage; the DC power source and the load device are adjustably interchangeable in position depending on the application.
In the scheme, the bidirectional DC/DC chopping lifting module and the bidirectional isolation DC/DC conversion unit module realize the function of charging or discharging the load equipment, wherein the Boost circuit is used for reducing the influence of overlarge direct current voltage generated by the DC power supply on the normal operation of the load equipment, so that the voltages at two ends of the load and the load equipment are reduced to normal values, the Buck circuit is used for improving the overlarge direct current voltage generated by the DC power supply, the voltages at two ends of the load equipment are maintained at a stable dynamic value under the combined action, the bidirectional isolation DC/DC conversion unit module boosts the input direct current power supply and reduces alternating current components in pulsating direct current voltage through the filter circuit to obtain stable direct current voltage to be applied to the load equipment, and the DC power supply and the load equipment can be adjusted and interchanged according to application, so that the device has wider usability, and the design cycle time of an industrial user is shortened.
Further, the DC/DC Buck-Boost rectification power supply module comprises a Boost circuit and a Buck circuit; the Boost circuit comprises a first inductor L1, a first IGBT switching tube T1 and a first diode D1, the Buck circuit comprises a second inductor L2, a second IGBT switching tube T2 and a second diode D2, and the DC/DC chopping lifting module is further provided with a third inductor L3; the collector of the second IGBT switch tube T2 is connected to one end of the first inductor L1, the emitter of the second IGBT switch tube T2 is connected to one end of the third inductor L3 and the cathode of the second diode D2, the other end of the first inductor L1 is connected to the collector of the first IGBT switch tube T1 and the anode of the first diode D1, the cathode of the first diode D1 is connected to one end of the second inductor L2, and the emitter of the first IGBT switch tube T1 is connected to the anode of the second diode D2; one end of the DC power supply is connected with the collector of the second IGBT switching tube T2 and one end of a first inductor L1; the other end of the DC power supply is connected with the emitter of the first IGBT switching tube T1 and the anode of a second diode D2.
In the scheme, through the connection relationship of the electronic elements, the DC power supply outputs direct-current voltage to flow into one section of the inductor L1 and the collector of the second IGBT switching tube T2, a Boost circuit composed of the first inductor L1, the first IGBT switching tube T1 and the first diode D1 realizes chopping boosting, and a Buck circuit composed of the second inductor L2, the second IGBT switching tube T2 and the second diode D2 realizes solid chopping voltage reduction.
Preferably, the other end of the second inductor L2 and the other end of the third inductor L3 are connected to one end of the capacitor C3, and the other end of one end of the capacitor C3 is further connected to the emitter of the first IGBT switching tube T1 and the anode of the second diode D2, where one end of the third inductor L3 and the cathode of the second diode D2, and the other end of the third inductor L3 is connected to one end of the capacitor C3, so that after the input voltage of the DC power supply is insufficient or stops working, the capacitor C3 flows back the stored current to the DC power supply, thereby charging the DC power supply.
Further, the bidirectional isolation DC/DC conversion unit module comprises an H inverter bridge, a unidirectional rectifier bridge and a high-frequency isolation transformer; the H inverter bridge comprises a third IGBT switching tube T3, a fourth IGBT switching tube T4, a fifth IGBT switching tube T5, a sixth IGBT switching tube T6 and four diodes; a collector of the third IGBT switch tube T3 is connected to one end of a capacitor C3, the other end of the second inductor L2, the other end of the third inductor L3, and a collector of a fifth IGBT switch tube T5, an emitter of the third IGBT switch tube T3 is connected to a collector of the fourth IGBT switch tube T4, an emitter of the fifth IGBT switch tube T5 is connected to a collector of the sixth IGBT switch tube T6, and an emitter of the fourth IGBT switch tube T4 is connected to an emitter of the sixth IGBT switch tube T6 and the other end of the capacitor C3, respectively; the third IGBT switching tube T3 to the sixth IGBT switching tube T6 are connected with a diode in an anti-parallel mode; the unidirectional rectifier bridge comprises a seventh IGBT switching tube T7, an eighth IGBT switching tube T8, a ninth IGBT switching tube T9, a tenth IGBT switching tube T10 and four diodes; the collector of the seventh IGBT switch tube T7 is connected to the collector of the ninth IGBT switch tube T9, the emitter of the seventh IGBT switch tube T7 is connected to the eighth IGBT switch tube T8, the emitter of the ninth IGBT switch tube T9 is connected to the collector of the tenth IGBT switch tube T10, and the emitter of the eighth IGBT switch tube T8 is connected to the emitter of the tenth IGBT switch tube T10; the seventh IGBT switching tube T7 to the tenth IGBT switching tube T10 are connected with a diode in an anti-parallel mode; the high-frequency isolation transformer comprises a primary side winding and a secondary side winding, wherein one end of the primary side winding is connected with an emitter of the third IGBT switching tube T3, a synonym end of the primary side winding is connected with an emitter of the fifth IGBT switching tube T5, a synonym end of the secondary side winding is connected with an emitter of the seventh IGBT switching tube T7, and a synonym end of the secondary side winding is connected with an emitter of the ninth IGBT switching tube T9; the other end of the second inductor L2 and the other end of the third inductor L3 are connected to one end of the capacitor C3, and the other end of one end of the capacitor C3 is further connected to the emitter of the first IGBT switching tube T1 and the anode of the second diode D2.
In the scheme, an H-bridge PWM inverter unit formed by the third IGBT switching tube T3, the fourth IGBT switching tube T4, the fifth IGBT switching tube T5, the sixth IGBT switching tube T6 and a diode connected in parallel one by one in an anti-parallel mode inverts a direct current power supply into PWM high-frequency alternating current square wave pulses, the PWM high-frequency alternating current square wave pulses are boosted through the high-frequency isolation rectifier transformer, and a single-phase bridge type high-frequency rectifier transformer formed by the seventh IGBT switching tube T7, the eighth IGBT switching tube T8, the ninth IGBT switching tube T9, the tenth IGBT switching tube T10 and a diode connected in parallel one by one in an anti-parallel mode converts alternating current voltage into direct current voltage.
Preferably, the filter circuit includes a filter inductor L4 and a filter capacitor C4, one end of the filter inductor L4 is connected to the collector of the seventh IGBT switch tube T7 and the pole of the ninth IGBT switch tube T9, the other end of the filter inductor L is connected to one end of a filter capacitor C4, and the other end of the filter capacitor C4 is connected to the emitter of the eighth IGBT switch tube T8 and the emitter of the tenth IGBT switch tube T10.
In this embodiment, the filter inductor L4 filters the converted dc voltage to remove unnecessary frequency signals in a specific band, thereby preventing interference, and the output current is the same as the parallel load frequency.
Preferably, the load device is connected in parallel with the filter capacitor, and is configured to filter an alternating current component, so that the output direct current voltage is smoother.
Optionally, the DC power supply includes a DC microgrid, a hydrogen fuel unit, a hydrogen production device, and an energy storage device.
Optionally, the load device comprises a power lithium battery, a hydrogen production electrolytic cell and a direct current microgrid.
In the scheme, the DC power supply and the load equipment can be selected selectively, so that the module can be used for the purpose of system hydrogen energy power generation DC/DC power conversion, can also be used for the function of bidirectional DC/DC isolation conversion of a load power distribution system, and has higher practicability and popularization value.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model relates to a two-way isolated form DC-DC buck-boost rectification power module, through two-way isolating the H bridge PWM inverter unit in the DC/DC conversion unit module with direct current power supply inversion become PWM high frequency alternating current square wave pulse, and single-phase bridge type high frequency rectification current conversion in the module converts alternating voltage into direct current voltage, this power module both has the effect of two-way DC/DC power conversion, still has the characteristics of input/output electric isolation simultaneously;
2. the utility model relates to a two-way isolated form DC-DC Buck-boost rectification power supply module, the design of DC/DC chopper lift module simultaneously, can be used to system energy storage battery charge-discharge to use through constituteing with Bboot and Buck, and have the functional characteristic of energy repayment;
3. the utility model relates to a two-way isolated form DC-DC buck-boost rectification power module, and with DC power and load equipment's multiple alternative, make this module can be used for system hydrogen energy electricity generation DC power conversion usage, can also keep apart the effect of transform in load distribution system's two-way DC, it possesses higher practicality and spreading value.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of an integral module in an embodiment of the present invention;
fig. 2 is a schematic diagram of a DC/DC chopper elevator module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a filter circuit module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an embodiment of the present invention, in which a 35KW/DC750 bidirectional isolation type DC/DC buck-boost rectification power supply module unit works;
FIG. 5 is a schematic diagram of the working of the energy storage battery charging/discharging DC/DC power module in the embodiment of the present invention;
FIG. 6 is a working schematic diagram of an electric DC/DC power module for electrolytic hydrogen production in the embodiment of the present invention;
FIG. 7 is a schematic diagram of the charging DC/DC power module for the lithium battery of the electric vehicle according to the embodiment of the present invention;
fig. 8 is a schematic diagram of the operation of the DC/DC power module for the inverter load according to the embodiment of the present invention;
fig. 9 is a working schematic diagram of the bidirectional DC/DC isolated rectification power module for hydrogen energy utilization in the embodiment of the present invention;
FIG. 10 is a schematic diagram of the operation of a DC/DC power module for power generation of a hydrogen fuel cell according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of the operation of the electric DC/DC power module for hydrogen production by electrolysis in the embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the present invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it should be understood that the terms "front", "back", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the scope of the present invention.
Examples
As shown in FIG. 1, the utility model relates to a two-way isolated form DC-DC buck-boost rectification power supply module, including DC power, DC/DC chopper lift module, two-way isolation DC/DC conversion unit module, filter circuit and load device. The DC power supply inputs direct-current voltage to the DC/DC chopping lifting module to regulate and control the direct-current voltage, the bidirectional DC/DC chopping lifting module and the bidirectional isolation DC/DC conversion unit module realize the charging or discharging effect on load equipment, then the bidirectional isolation DC/DC conversion unit module performs isolation rectification and then flows into the filter circuit to be processed to obtain stable direct-current voltage, the stable direct-current voltage flows into the load equipment to supply power to the load equipment, the bidirectional isolation DC/DC conversion unit module boosts the input direct-current power supply and reduces alternating-current components in the pulsating direct-current voltage through the filter circuit to obtain stable direct-current voltage, and the stable direct-current voltage is applied to the load equipment. The DC/DC Buck-Boost rectification power supply module comprises a Boost circuit and a Buck circuit, and is used for chopping and boosting input direct-current voltage when the input power supply of the DC power supply is lower than the voltage of load equipment, and chopping and reducing the input direct-current voltage when the input power supply of the DC power supply is higher than the voltage of the load equipment. The Boost circuit is used for reducing the influence of overlarge direct-current voltage generated by the DC power supply on the normal operation of the load equipment, so that the voltages at two ends of the load equipment are reduced to normal values, the Buck circuit is used for improving the overlarge direct-current voltage generated by the DC power supply, the voltages at two ends of the load equipment are maintained at a stable dynamic value under the combined action, the positions of the DC power supply and the load equipment can be adjusted and exchanged according to application, so that the direct-current power supply and the load equipment have wider usability, and the design cycle time of an industrial user is shortened.
As a preferred example of the above embodiment, as shown in fig. 2, the DC/DC Buck-Boost rectification power supply module includes a Boost circuit and a Buck circuit; the Boost circuit comprises a first inductor L1, a first IGBT switching tube T1 and a first diode D1, the Buck circuit comprises a second inductor L2, a second IGBT switching tube T2 and a second diode D2, and the DC/DC chopping lifting module is further provided with a third inductor L3; the collector of the second IGBT switch tube T2 is connected to one end of the first inductor L1, the emitter of the second IGBT switch tube T2 is connected to one end of the third inductor L3 and the cathode of the second diode D2, the other end of the first inductor L1 is connected to the collector of the first IGBT switch tube T1 and the anode of the first diode D1, the cathode of the first diode D1 is connected to one end of the second inductor L2, and the emitter of the first IGBT switch tube T1 is connected to the anode of the second diode D2; one end of the DC power supply is connected with the collector of the second IGBT switching tube T2 and one end of a first inductor L1; the other end of the DC power supply is connected with the emitter of the first IGBT switching tube T1 and the anode of a second diode D2.
As shown in fig. 4, preferably, the other end of the second inductor L2 and the other end of the third inductor L3 are connected to one end of the capacitor C3, and one end of the capacitor C3 is further connected to the emitter of the first IGBT switching tube T1 and the anode of the second diode D2, where one end of the third inductor L3 is connected to the cathode of the second diode D2, and the other end of the third inductor L3 is connected to one end of the capacitor C3, so that after the DC power input voltage is insufficient or stops operating, the capacitor C3 flows back the stored current to the DC power supply, thereby charging the DC power supply.
As a preferred example of the foregoing embodiment, as shown in fig. 4, the bidirectional isolation DC/DC conversion unit module includes an H inverter bridge, a unidirectional rectifier bridge, and a high-frequency isolation transformer; the H-bridge PWM inverter unit is formed by inverting a direct-current power supply into PWM high-frequency alternating-current square wave pulses through the H-bridge PWM inverter unit, and comprises a third IGBT switching tube T3, a fourth IGBT switching tube T4, a fifth IGBT switching tube T5, a sixth IGBT switching tube T6 and four diodes; a collector of the third IGBT switch tube T3 is connected to one end of a capacitor C3, the other end of the second inductor L2, the other end of the third inductor L3, and a collector of a fifth IGBT switch tube T5, an emitter of the third IGBT switch tube T3 is connected to a collector of the fourth IGBT switch tube T4, an emitter of the fifth IGBT switch tube T5 is connected to a collector of the sixth IGBT switch tube T6, and an emitter of the fourth IGBT switch tube T4 is connected to an emitter of the sixth IGBT switch tube T6 and the other end of the capacitor C3, respectively; the third IGBT switching tube T3 to the sixth IGBT switching tube T6 are connected with a diode in an anti-parallel mode; the unidirectional rectifier bridge comprises a seventh IGBT switching tube T7, an eighth IGBT switching tube T8, a ninth IGBT switching tube T9, a tenth IGBT switching tube T10 and four diodes, and the single-phase bridge type high-frequency rectifier bridge formed by the unidirectional rectifier bridge converts alternating-current voltage into direct-current voltage; the collector of the seventh IGBT switch tube T7 is connected to the collector of the ninth IGBT switch tube T9, the emitter of the seventh IGBT switch tube T7 is connected to the eighth IGBT switch tube T8, the emitter of the ninth IGBT switch tube T9 is connected to the collector of the tenth IGBT switch tube T10, and the emitter of the eighth IGBT switch tube T8 is connected to the emitter of the tenth IGBT switch tube T10; the seventh IGBT switching tube T7 to the tenth IGBT switching tube T10 are connected with a diode in an anti-parallel mode; the high-frequency isolation transformer comprises a primary side winding and a secondary side winding, wherein one end of the primary side winding is connected with an emitter of the third IGBT switching tube T3, a synonym end of the primary side winding is connected with an emitter of the fifth IGBT switching tube T5, a synonym end of the secondary side winding is connected with an emitter of the seventh IGBT switching tube T7, and a synonym end of the secondary side winding is connected with an emitter of the ninth IGBT switching tube T9; the other end of the second inductor L2 and the other end of the third inductor L3 are connected to one end of the capacitor C3, and the other end of one end of the capacitor C3 is further connected to the emitter of the first IGBT switching tube T1 and the anode of the second diode D2.
As shown in fig. 3 and 4, the filter circuit preferably includes a filter inductor L4 and a filter capacitor C4, one end of the filter inductor L4 is connected to the collector of the seventh IGBT switch tube T7 and the pole of the ninth IGBT switch tube T9, respectively, the other end is connected to one end of a filter capacitor C4, the other end of the filter capacitor C4 is connected to the emitter of the eighth IGBT switch tube T8 and the emitter of the tenth IGBT switch tube T10, respectively, and the filter inductor L4 filters unnecessary frequency signals in a specific wavelength band from the converted dc voltage to prevent interference.
In addition, as shown in fig. 4, the load device is connected in parallel with the filter capacitor, and is used for filtering out an alternating current component to make an output direct current voltage smoother.
And with the multiple alternative of DC power and load equipment, make this module can be used to system hydrogen energy electricity generation DC/DC power conversion usage, can also be in the effect of the two-way DC/DC isolation transform of load distribution system, it possesses higher practicality and spreading value.
It should be noted that, in the present application, a working principle of a 35KW/DC750 bidirectional isolation type DC-DC buck-boost rectification power supply module unit is shown in detail in fig. 4;
the hydrogen fuel cell generator set is converted into DC750V direct current by respective DC/DC conversion devices and mainly comprises two-stage DC/DC conversion modules. Because the output voltage range of the hydrogen energy generating set is wide (100V-400V), the front-stage DC/DC conversion unit consists of a Boost circuit and a Buck chopping Boost-Buck circuit, the rear-stage DC/DC conversion unit is converted into a single-phase H bridge to form PWM inversion for high-frequency inversion, the PWM inversion is isolated by a high-frequency isolation transformer and boosted, the PWM inversion is rectified by a single-phase diode rectifier bridge, and DC750V direct-current voltage is obtained through filtering. The rear-stage DC/DC isolation rectifying unit is mainly composed of an H-bridge PWM inverting unit consisting of T3, T4, T5 and T6, and is used for inverting a DC power supply of DC375V into PWM high-frequency alternating-current square-wave pulses of 16.5KHZ, isolating and boosting the pulses through a high-frequency isolation rectifying transformer, performing single-phase bridge high-frequency rectification conversion through T7, T8, T9 and T10, obtaining stable DC bus voltage after LC filtering, merging the stable DC bus voltage into a DC750V DC network, and providing a DC750V DC voltage source for a load.
The application also provides a working schematic diagram of the DC-DC power module for charging and discharging the energy storage battery, which is shown in detail in FIG. 5;
because the output voltage range of the energy storage battery pack is wide (500V-850V), the front-stage DC/DC conversion unit consists of a Boost chopping booster circuit, the rear-stage DC/DC conversion unit consists of a single-phase H bridge to form PWM inversion for high-frequency inversion, the PWM inversion is carried out by isolating the voltage transformation through a high-frequency isolation transformer, the voltage transformation is carried out by rectifying through a single-phase diode rectifier bridge, and the DC750V direct-current voltage is obtained by LC filtering. The front-stage PWM chopping buck-boost rectifying unit feeds power to the direct-current bus through the bidirectional DC/DC isolation module by the energy storage battery pack when the voltage of the direct-current bus is lower than-10% (DC675V) so as to keep the voltage of the direct-current bus stable; when the direct current bus voltage is higher than + 10% (DC825V), the direct current bus charges the energy storage battery pack through the DC/DC bidirectional isolation module. So that the voltage of the direct current bus of the transformer is kept stable.
The application also provides a working schematic diagram of the electric DC-DC power module for hydrogen production by electrolysis, which is shown in detail in figure 6;
the electric working principle of the main circuit of the DC/DC module for hydrogen production by electrolysis mainly comprises two stages of DC/DC conversion modules. Because the output voltage range of the direct-current bus of the direct-current micro-grid is wide (675V-825V), the front-stage DC/DC conversion unit consists of a Buck chopping step-down chopper circuit, the rear-stage DC/DC is converted into a single-phase H bridge to form PWM inversion for high-frequency inversion, the PWM inversion is isolated by a high-frequency isolation transformer for voltage transformation, the voltage is rectified by a single-phase diode rectifier bridge, and the direct-current voltage required by the electrolytic cell of the DC500V is obtained through LC filtering output.
The application also provides a working schematic diagram of the charging DC-DC power module for the lithium battery of the electric automobile, which is shown in detail in FIG. 7;
because the output voltage range of the direct-current bus of the direct-current micro-grid is wide (675V-825V), the front-stage DC/DC conversion unit consists of a Buck and Boost chopping voltage-boosting chopper circuit, the rear-stage DC/DC is converted into a single-phase H bridge to form PWM inversion for high-frequency inversion, the PWM inversion is isolated by a high-frequency isolation transformer for voltage transformation, the voltage is rectified by a single-phase diode rectifier bridge, and the direct-current voltage required by charging of the DC750V electric vehicle is obtained through LC filtering output.
The application also provides a working schematic diagram of the DC-DC power module for the inverter load, which is detailed in figure 8;
the electrical working principle of the main circuit of the DC/DC module for the frequency conversion inverter mainly comprises two stages of DC/DC conversion modules. Because the output voltage range of the direct-current bus of the direct-current micro-grid is wide (675V-825V), the front-stage DC/DC conversion unit consists of a Buck and Boost chopping voltage-boosting chopper circuit, the rear-stage DC/DC is converted into a single-phase H bridge to form PWM inversion for high-frequency inversion, the PWM inversion is isolated by a high-frequency isolation transformer for voltage transformation, the voltage is rectified by a single-phase diode rectifier bridge, and the direct-current voltage required by charging of the DC750V electric vehicle is obtained through LC filtering output.
In summary, the described DC/DC isolation and conversion module based on DC750V DC bus for hydrogen energy utilization all adopts the same technical principle scheme, so no matter the DC/DC conversion module with hydrogen fuel cell power generation grid connection or the DC/DC isolation and conversion module with load application, its main circuit can be unified, power level can be unified, control mode can be unified, and input/output interface can be unified. The DC/DC conversion module based on hydrogen energy utilization is standardized, the same module has various industrial application scenes, product design and model selection are facilitated, national standards for hydrogen energy utilization are facilitated to be formulated, and the rapid development of the hydrogen energy utilization new energy industry is promoted.
In addition, the application also provides a working principle diagram of the bidirectional DC-DC isolation rectification power module for hydrogen energy utilization, and the working principle diagram is shown in detail in FIG. 9;
the module has a bidirectional regulation function and electrical isolation of the transformer, so that the module can be used for hydrogen energy power generation DC/DC isolation conversion and load DC/DC isolation rectification power conversion, and is suitable for industrial application scene design and model selection.
The application also provides a working principle diagram of a hydrogen fuel cell power generation DC-DC power module, which is detailed in figure 10;
the application also provides a working schematic diagram of the electric DC-DC power module for hydrogen production by electrolysis, which is shown in detail in figure 11;
the main circuits can be unified, the power levels can be unified, the control modes can be unified, and the input/output interfaces can be unified, which is not described in detail herein.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A bidirectional isolation type DC-DC buck-boost rectification power supply module is characterized by comprising a DC power supply, a DC/DC chopping up-down module, a bidirectional isolation DC/DC conversion unit module, a filter circuit and load equipment;
the DC power supply inputs direct-current voltage to the DC/DC chopping lifting module to regulate and control the direct-current voltage, and then the direct-current voltage flows into the filter circuit for processing after being isolated and rectified along the bidirectional isolation DC/DC conversion unit module to obtain stable direct-current voltage which flows into load equipment to supply power for the load equipment;
the DC/DC Buck-Boost rectification power supply module comprises a Boost circuit and a Buck circuit; when the input power supply of the DC power supply is higher than the voltage of the load equipment, the DC power supply is used for chopping and boosting the input direct-current voltage, and when the input power supply of the DC power supply is higher than the voltage of the load equipment, the DC power supply is used for chopping and reducing the input direct-current voltage;
the DC power source and the load device are adjustably interchangeable in position depending on the application.
2. The bidirectional isolation type DC-DC Buck-Boost rectification power supply module according to claim 1, wherein the Boost circuit comprises a first inductor L1, a first IGBT switching tube T1 and a first diode D1, the Buck circuit comprises a second inductor L2, a second IGBT switching tube T2 and a second diode D2, and the DC/DC chopper Buck-Boost module is further provided with a third inductor L3;
the collector of the second IGBT switch tube T2 is connected to one end of the first inductor L1, the emitter of the second IGBT switch tube T2 is connected to one end of the third inductor L3 and the cathode of the second diode D2, the other end of the first inductor L1 is connected to the collector of the first IGBT switch tube T1 and the anode of the first diode D1, the cathode of the first diode D1 is connected to one end of the second inductor L2, and the emitter of the first IGBT switch tube T1 is connected to the anode of the second diode D2;
one end of the DC power supply is connected with the collector of the second IGBT switching tube T2 and one end of a first inductor L1; the other end of the DC power supply is connected with the emitter of the first IGBT switching tube T1 and the anode of a second diode D2.
3. The bidirectional isolation type DC-DC buck-boost rectification power supply module according to claim 2, wherein a capacitor C3 is connected to the other end of the second inductor L2 and the other end of the third inductor L3, and the other end of the capacitor C3 is further connected to an emitter of the first IGBT switch tube T1 and an anode of the second diode D2.
4. The bidirectional isolation type DC-DC buck-boost rectification power supply module according to claim 2, wherein the bidirectional isolation DC/DC conversion unit module comprises an H inverter bridge, a unidirectional rectification bridge and a high-frequency isolation transformer;
the H inverter bridge comprises a third IGBT switching tube T3, a fourth IGBT switching tube T4, a fifth IGBT switching tube T5, a sixth IGBT switching tube T6 and four diodes; a collector of the third IGBT switch tube T3 is connected to one end of a capacitor C3, the other end of the second inductor L2, the other end of the third inductor L3, and a collector of a fifth IGBT switch tube T5, an emitter of the third IGBT switch tube T3 is connected to a collector of the fourth IGBT switch tube T4, an emitter of the fifth IGBT switch tube T5 is connected to a collector of the sixth IGBT switch tube T6, and an emitter of the fourth IGBT switch tube T4 is connected to an emitter of the sixth IGBT switch tube T6 and the other end of the capacitor C3, respectively; the third IGBT switching tube T3 to the sixth IGBT switching tube T6 are connected with a diode in an anti-parallel mode;
the unidirectional rectifier bridge comprises a seventh IGBT switching tube T7, an eighth IGBT switching tube T8, a ninth IGBT switching tube T9, a tenth IGBT switching tube T10 and four diodes; the collector of the seventh IGBT switch tube T7 is connected to the collector of the ninth IGBT switch tube T9, the emitter of the seventh IGBT switch tube T7 is connected to the eighth IGBT switch tube T8, the emitter of the ninth IGBT switch tube T9 is connected to the collector of the tenth IGBT switch tube T10, and the emitter of the eighth IGBT switch tube T8 is connected to the emitter of the tenth IGBT switch tube T10; the seventh IGBT switching tube T7 to the tenth IGBT switching tube T10 are connected with a diode in an anti-parallel mode;
the high-frequency isolation transformer comprises a primary side winding and a secondary side winding, wherein one end of the primary side winding is connected with an emitter of the third IGBT switching tube T3, a synonym end of the primary side winding is connected with an emitter of the fifth IGBT switching tube T5, a synonym end of the secondary side winding is connected with an emitter of the seventh IGBT switching tube T7, and a synonym end of the secondary side winding is connected with an emitter of the ninth IGBT switching tube T9.
5. The bi-directional isolation type DC-DC buck-boost rectification power supply module of claim 4,
the filter circuit comprises a filter inductor L4 and a filter capacitor C4, one end of the filter inductor L4 is connected with the collector electrode of the seventh IGBT switch tube T7 and the pole electrode of the ninth IGBT switch tube T9 respectively, the other end of the filter inductor L4 is connected with one end of a filter capacitor C4, and the other end of the filter capacitor C4 is connected with the emitter electrode of the eighth IGBT switch tube T8 and the emitter electrode of the tenth IGBT switch tube T10 respectively.
6. The bi-directional isolated DC-DC buck-boost rectifier power module of claim 5, wherein said load device is connected in parallel with said filter capacitor C4.
7. The bidirectional isolation type DC-DC buck-boost rectification power supply module according to claim 1, wherein the DC power supply comprises a direct current micro-grid, a hydrogen fuel unit, a hydrogen production device and an energy storage device.
8. The bi-directional isolated DC-DC buck-boost rectifier power module of claim 1, wherein the load devices include power lithium batteries, hydrogen production electrolyzer cells, and DC microgrid.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115514070A (en) * | 2022-09-26 | 2022-12-23 | 深圳易能电科技有限公司 | Efficient charging circuit and charging device using same |
| CN116207984A (en) * | 2023-04-28 | 2023-06-02 | 深圳市恒运昌真空技术有限公司 | Bidirectional DC-DC conversion circuit, method and device |
| CN116505779A (en) * | 2023-05-17 | 2023-07-28 | 江苏科曜能源科技有限公司 | Single-phase energy storage device |
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2020
- 2020-10-20 CN CN202022343714.6U patent/CN213185893U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115514070A (en) * | 2022-09-26 | 2022-12-23 | 深圳易能电科技有限公司 | Efficient charging circuit and charging device using same |
| CN116207984A (en) * | 2023-04-28 | 2023-06-02 | 深圳市恒运昌真空技术有限公司 | Bidirectional DC-DC conversion circuit, method and device |
| CN116505779A (en) * | 2023-05-17 | 2023-07-28 | 江苏科曜能源科技有限公司 | Single-phase energy storage device |
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