Novel non-isolated bidirectional digital power supply

Abstract

The invention discloses a novel non-isolated bidirectional digital power supply which comprises a power conversion circuit, an auxiliary power supply circuit, an input / output current and voltage detection circuit, a master control DSP circuit, a protection circuit, a display and setting circuit and a communication circuit. The power conversion circuit, the auxiliary power supply circuit, the input / output current and voltage detection circuit, the display and setting circuit and the communication circuit are all connected with the master control DSP circuit, and the display and setting circuit and the communication circuit set output and input transmission directions and limit voltage and current thresholds. The input / output current and voltage detection circuit is respectively connected with the three paths of solar panels, the protocol charging and discharging pile and the electric controller; an MPPT power conversion algorithm is carried out, power conversion in different directions can be achieved, and constant-current, constant-voltage and trickle charging curve management and derating processing are achieved; and the power conversion module adopts a three-phase interlaced BOOST topological architecture, so that digital control and two-way energy transmission are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of non-isolated bidirectional digital power supply, and in particular to a novel non-isolated bidirectional digital power supply. Background Art

[0002] It is often difficult to achieve high-precision output of current and voltage in traditional non-isolated bidirectional digital power supplies, and the design is complex and the conversion efficiency is low. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a novel non-isolated bidirectional digital power supply.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A novel non-isolated bidirectional digital power supply comprises a power conversion circuit, an auxiliary power supply circuit, an input / output current and voltage detection circuit, a main control DSP (digital signal processor) circuit, a protection circuit, a display and setting circuit and a communication circuit; the power conversion circuit, the auxiliary power supply circuit, the input / output current and voltage detection circuit, the display and setting circuit and the communication circuit are all connected to the main control DSP (digital signal processor) circuit, the display and setting circuit and the communication circuit set the output and input transmission direction, limit the voltage and limit the current threshold, and the input / output current and voltage detection circuits are respectively connected to a solar panel, a protocol charging and discharging pile and an electrical controller.

[0005] Preferably, the input / output current and voltage detection circuit includes input voltage sampling, output voltage sampling, input current sampling, output current sampling and MOSFET current sampling.

[0006] Preferably, the power conversion circuit adopts a three-phase interleaved BOOST topology architecture.

[0007] Preferably, the input voltage sampling, the output voltage sampling, the input current sampling, the output current sampling and the mosfet current sampling are all connected to the three-phase interleaved BOOST topology architecture.

[0008] Preferably, the input voltage sampling and the input current sampling are both connected to the solar panel.

[0009] Preferably, the output voltage sampling and the output current sampling are both connected to the protocol charging and discharging pile.

[0010] Preferably, the input / output current and voltage detection circuits are input and output via bus voltage and bus current.

[0011] Preferably, the communication circuit is connected to the electrical controller.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention designs a novel non-isolated bidirectional digital power supply, performs MPPT power conversion algorithm, can realize power conversion in different directions, and realize constant current, constant voltage, trickle charging curve management and derating processing; or mppt (maximum power follower) power conversion; the power conversion module adopts a three-phase staggered BOOST topology architecture to realize digital control and bidirectional energy transmission; the power conversion module is not connected to the electrical controller to ensure the safety of the main body, display setting module and communication module to the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 The structural principle diagram proposed by the present invention; Figure 2 This is a circuit diagram of the three-phase interleaved Boost topology and output voltage sampling structure proposed by the present invention; Figure 3 The input voltage sampling circuit diagram proposed by the present invention; Figure 4 The input current sampling circuit diagram proposed by the present invention; Figure 5 The output current sampling circuit diagram proposed by the present invention; Figure 6 This is a MOSFET current sampling circuit diagram proposed by the present invention. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the features defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more; in addition, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a communication between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] Reference Figures 1 to 6 As shown, a novel non-isolated bidirectional digital power supply includes a power conversion circuit, an auxiliary power supply circuit, an input / output current, a voltage detection circuit, a main control DSP (digital signal processor) circuit, a protection circuit, a display and setting circuit and a communication circuit; the power conversion circuit, the auxiliary power supply circuit, the input / output current, the voltage detection circuit, the display and setting circuit and the communication circuit are all connected to the main control DSP (digital signal processor) circuit, the display and setting circuit and the communication circuit set the output and input transmission direction, limit the voltage, and limit the current threshold, and the input / output current and voltage detection circuits are respectively connected to a solar panel, a protocol charging and discharging pile and an electrical controller.

[0017] Among them, the input / output current and voltage detection circuit includes input voltage sampling, output voltage sampling, input current sampling, output current sampling and mosfet current sampling; the power conversion circuit adopts a three-phase interleaved BOOST topology architecture to realize digital control and bidirectional energy transmission; three-phase interleaved Boost topology, the three groups of PV input voltage range is 200V~350V, the three-phase phase difference is 120°, the MPPT algorithm is used to staggered Boost control, and the PI algorithm is used for adjustment. The output bus voltage is 350V~850V, which is used to charge 400V or 800V power batteries.

[0018] The MPPT (maximum power point tracking) control algorithm continuously monitors the voltage and current output of the solar panel, optimizes the load impedance using the perturbation and observation algorithm, and adaptively compensates for temperature, thereby extracting the maximum power. By tracking the maximum power point in real time, the MPPT controller can improve the energy conversion efficiency while enhancing the stability and adaptability of the system. The MPPT photovoltaic charger plays an important role in coordinating the work of solar panels, batteries, and loads in the solar photovoltaic system, and is the brain of the photovoltaic system. The PI control algorithm is a common automatic control principle that achieves stable control of the system through proportional control and integral control. PI control consists of two parts: proportional control (P) and integral control (I), which work together to control the system.

[0019] Input voltage sampling, output voltage sampling, input current sampling, output current sampling and mosfet current sampling are all connected to the three-phase interleaved BOOST topology architecture; input voltage sampling and input current sampling are both connected to the solar panel, output voltage sampling and output current sampling are both connected to the protocol charging and discharging pile, and the input / output current and voltage detection circuits are input and output through the bus voltage and bus current.

[0020] The communication circuit is connected to the electrical controller, and the power conversion circuit and the control circuit are isolated without electrical connection, ensuring the safety of the main control DSP (digital signal processor) circuit, display and setting circuit, and communication circuit to the human body.

[0021] The main control DSP (digital signal processor) circuit is a single-chip microcomputer or a digital signal processor. The single-chip microcomputer (or digital signal processor) is used to perform the MPPT power conversion algorithm, which can realize power conversion in different directions, and realize constant current, constant voltage, trickle charging curve management and derating processing; or mppt (maximum power follower) power conversion; the input and output range of the digital power supply needs to be limited to a certain range according to the BOOST conversion topology algorithm.

[0022] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0023] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A new type of non-isolated bidirectional digital power supply, characterized in that: It includes a power conversion circuit, an auxiliary power supply circuit, an input / output current and voltage detection circuit, a main control DSP (digital signal processor) circuit, a protection circuit, a display and setting circuit and a communication circuit; the power conversion circuit, the auxiliary power supply circuit, the input / output current and voltage detection circuit, the display and setting circuit and the communication circuit are all connected to the main control DSP (digital signal processor) circuit, the display and setting circuit and the communication circuit set the output and input transmission direction, limit the voltage, and limit the current threshold, and the input / output current and voltage detection circuits are respectively connected to a solar panel, a protocol charging and discharging pile and an electrical controller.

2. According to claim 1, a novel non-isolated bidirectional digital power supply is characterized in that: The input / output current and voltage detection circuit includes input voltage sampling, output voltage sampling, input current sampling, output current sampling and MOSFET current sampling.

3. According to claim 2, a novel non-isolated bidirectional digital power supply is characterized in that: The power conversion circuit adopts a three-phase interleaved BOOST topology architecture.

4. According to claim 3, a novel non-isolated bidirectional digital power supply is characterized in that: The input voltage sampling, the output voltage sampling, the input current sampling, the output current sampling and the mosfet current sampling are all connected to the three-phase interleaved BOOST topology architecture.

5. According to claim 3, a novel non-isolated bidirectional digital power supply is characterized in that: The input voltage sampling and the input current sampling are both connected to the solar panel.

6. According to claim 3, a novel non-isolated bidirectional digital power supply is characterized in that: The output voltage sampling and the output current sampling are both connected to the protocol charging and discharging pile.

7. According to claim 1, a novel non-isolated bidirectional digital power supply is characterized in that: The input / output current and voltage detection circuits are input and output via bus voltage and bus current.

8. According to claim 1, a novel non-isolated bidirectional digital power supply is characterized in that: The communication circuit is connected to the electrical controller.

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