Bridge type rectification power module with controllable inversion output

Abstract

The utility model provides a bridge type rectification power module with controllable inversion output, which relates to the technical field of power electronics and is characterized in that two ends of a resistor are used as power supply ends to be connected with external equipment; the output end of the three-phase rectification unit is connected with the two ends of the resistor, and the three-phase rectification unit is used for rectifying alternating current of a three-phase input power supply into direct current when the input end is connected with the three-phase input power supply. A first terminal and a second terminal of the inversion and rectification integrated unit are respectively connected with two ends of the resistor and are used for performing full-bridge inversion on the direct current output by the three-phase bridge type rectification unit into alternating current and outputting the alternating current from a third terminal and a fourth terminal; when the third terminal and the fourth terminal of the inversion and rectification integrated unit are connected with an AC input power supply, AC is subjected to single-phase full-bridge rectification to form DC, and the DC is output to external equipment from the first terminal and the second terminal. The three-phase full-bridge rectifier has the beneficial effects that the three-phase full-bridge rectifier has the functions of three-phase full-bridge rectifier, full-bridge inverter conversion and single-phase bridge rectifier, and can be widely applied to the fields of electric power, industry, new energy and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a bridge rectifier power module with controllable inverter output. Background Art

[0002] Power electronics technology is a technology that studies the efficient conversion of electrical energy between different forms. It is widely used in the fields of industry, transportation, communication, energy, national defense, etc. The core of power electronics technology is the power electronic converter, which mainly includes rectifiers, inverters, DC converters, frequency converters, etc. Rectifiers are devices that convert AC power into DC power, inverters are devices that convert DC power into AC power, DC converters are devices that convert one DC power into another DC power, and frequency converters are devices that convert AC power of one frequency into AC power of another frequency.

[0003] The role of inverters and rectifiers in power systems is becoming increasingly important, especially in new energy systems. Inverters and rectifiers are key devices for realizing renewable energy grid connection, energy storage, microgrids and other functions. For example, in a solar photovoltaic power generation system, an inverter is a device that converts the DC power output by a photovoltaic cell into AC power that meets the requirements of the power grid, and a rectifier is a device that converts the AC power of the power grid into DC power for rechargeable batteries. The performance and control strategy of inverters and rectifiers directly affect the efficiency, stability and reliability of photovoltaic power generation systems.

[0004] With the rapid increase of industrial electrical equipment, people's requirements for power types have also increased dramatically. At the same time, the role of electricity in the new energy system is gradually increasing. When building a high-proportion renewable energy and high-proportion power electronics system, the technical level and innovation ability of inverters and rectifiers face huge challenges. On the one hand, inverters and rectifiers need to have high efficiency, high reliability, high power density, low cost and other characteristics to meet the needs of different scenarios and applications; on the other hand, inverters and rectifiers need to have flexible, intelligent, coordinated, interactive and other functions to adapt to the complex, dynamic and uncertain power system environment.

[0005] Although there have been many research results and patent applications, the technology of inverters and rectifiers still has a lot of room for improvement and innovation potential, especially in the fields of electric vehicles, smart grids, distributed power generation, etc., the technical requirements and challenges of inverters and rectifiers are increasing. If a multifunctional and highly reliable power module integrating inverter and rectifier can be designed, it will provide support for the construction of new power systems. Therefore, it is necessary to conduct an in-depth analysis and summary of the technical status and development trend of inverters and rectifiers, in order to provide useful reference and guidance for the technical innovation and application of inverters and rectifiers. Utility Model Content

[0006] In view of the problems existing in the prior art, the utility model provides a bridge rectifier power module with controllable inverter output, comprising:

[0007] A resistor, both ends of which are connected to an external device as power supply ends, and both ends of the resistor are connected in parallel with a first capacitor and grounded;

[0008] A three-phase bridge rectifier unit, wherein the output end of the three-phase bridge rectifier unit is connected to the two ends of the resistor, and is used for rectifying the AC power input by the three-phase input power supply into DC power by three-phase full-bridge when the input end of the three-phase bridge rectifier unit is connected to the three-phase input power supply;

[0009] An inverter and rectifier integrated unit, wherein the first terminal and the second terminal of the inverter and rectifier integrated unit are respectively connected to the two ends of the resistor, and are used to invert the DC full-bridge output of the three-phase bridge rectifier unit into AC power and output it from the third terminal and the fourth terminal of the inverter and rectifier integrated unit;

[0010] When the third terminal and the fourth terminal of the inverter and rectifier integrated unit are connected to an AC input power source, they are used to rectify the AC power input by the AC input power source into DC power through a single-phase full-bridge rectification and output it to the external device from the first terminal and the second terminal.

[0011] Preferably, the three-phase bridge rectifier unit includes a common cathode diode group and a common anode diode group, and the cathode of the common cathode diode group and the anode of the common anode diode group are connected to the first terminal and the second terminal of the inverter and rectifier integrated unit:

[0012] A plurality of capacitors are connected in parallel between the cathode of the common cathode diode group and the anode of the common anode diode group.

[0013] Preferably, the common cathode diode group includes:

[0014] Three common cathode diodes, the cathodes of the common cathode diodes are connected, and the anodes of the common cathode diodes are respectively connected to one phase of a three-phase input power supply;

[0015] The common anode diode group comprises:

[0016] There are three common anode diodes, the anodes of the common anode diodes are connected, and the cathodes of the common anode diodes are respectively connected to one phase of the three-phase input power supply.

[0017] Preferably, the inverter and rectifier integrated unit comprises a first bridge arm and a second bridge arm connected in parallel and a second capacitor;

[0018] The first wiring end of the first bridge arm and the first wiring end of the second bridge arm are connected to one end of the resistor, and the second wiring end of the first bridge arm and the second wiring end of the second bridge arm are connected to the other end of the resistor;

[0019] The midpoint of the first bridge arm serves as the third terminal of the inverter and rectifier integrated unit, and the midpoint of the second bridge arm serves as the fourth terminal of the inverter and rectifier integrated unit.

[0020] Preferably, the first bridge arm comprises:

[0021] a first switch device, one end of the first switch device is connected to one end of the resistor, the other end of the first switch device is connected to one end of the second switch device, and the other end of the second switch device is connected to the other end of the resistor;

[0022] A first controller, connected to two ends and a conduction end of the first switch device and the second switch device respectively;

[0023] The other end of the first switch device serves as the midpoint of the first bridge arm.

[0024] Preferably, the second bridge arm comprises:

[0025] a third switch device, one end of the third switch device being connected to one end of the resistor, the other end of the third switch device being connected to one end of a fourth switch device, the other end of the fourth switch device being connected to the other end of the resistor;

[0026] A second controller, connected to two ends and a conduction end of the third switch device and the fourth switch device respectively;

[0027] The other end of the third switch device serves as the midpoint of the second bridge arm.

[0028] The above technical solution has the following advantages or beneficial effects: it adopts an industrial-grade modular design, and has three-phase full-bridge rectification and full-bridge inverter conversion functions (AC-DC), and also has a single-phase bridge rectification function (DC-AC). Compared with the rectifier power module in traditional technology, it can be widely used in various power, industrial and new energy fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural schematic diagram of a bridge rectifier power module with controllable inverter output in a preferred embodiment of the utility model;

[0030] Figure 2 In a preferred embodiment of the utility model, the voltage waveform of the voltage across the resistor and the rectified output DC power when the three-phase bridge rectifier unit is working;

[0031] Figure 3 to Figure 4 It is a schematic diagram of the structure of the inverter and rectifier integrated unit and a schematic diagram of the current flow after inversion in a preferred embodiment of the utility model;

[0032] Figure 5 This is a structural schematic diagram of another inverter and rectifier integrated unit in a preferred embodiment of the utility model;

[0033] Figure 6 to Figure 7 This is a schematic diagram of the current flow after rectification of another inverter and rectifier integrated unit in a preferred embodiment of the utility model;

[0034] Figure 8 This is a current waveform diagram corresponding to another inverter and rectifier integrated unit in a preferred embodiment of the present utility model. DETAILED DESCRIPTION

[0035] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The present invention is not limited to the implementation mode, and other implementation modes may also fall within the scope of the present invention as long as they meet the purpose of the present invention.

[0036] In a preferred embodiment of the present utility model, based on the above problems existing in the prior art, a bridge rectifier power module with controllable inverter output is provided. Figure 1 As shown, including:

[0037] A resistor R, two ends of the resistor R are connected to an external device as power supply ends, and two ends of the resistor R are connected in parallel with a first capacitor C1 and grounded;

[0038] A three-phase bridge rectifier unit 1, wherein the output end of the three-phase bridge rectifier unit 1 is connected to the two ends of the resistor R, and is used to rectify the alternating current input by the three-phase input power supply UVW into direct current by a three-phase full-bridge when the input end of the three-phase bridge rectifier unit 1 is connected to the three-phase input power supply;

[0039] An inverter and rectifier integrated unit 2, wherein the first terminal and the second terminal of the inverter and rectifier integrated unit 2 are respectively connected to the two ends of the resistor R, and are used to convert the DC full-bridge output of the three-phase bridge rectifier unit 1 into AC power and output it from the third terminal and the fourth terminal of the inverter and rectifier integrated unit 2;

[0040] When the third terminal and the fourth terminal of the inverter and rectifier integrated unit 2 are connected to the AC input power supply, they are used to rectify the AC power input by the AC input power supply into DC power through the single-phase full-bridge rectification and output it to the external device from the first terminal and the second terminal.

[0041] Specifically, the bridge rectifier power module in this embodiment adopts an industrial-grade modular design, and has three-phase full-bridge rectification and full-bridge inverter conversion functions (AC-DC), and also has a single-phase bridge rectification function (DC-AC). Compared with the rectifier power module in traditional technology, it can be widely used in various power, industrial and new energy fields.

[0042] In a preferred embodiment of the present invention, Figure 1 As shown, the three-phase bridge rectifier unit 1 includes a common cathode diode group 11 and a common anode diode group 12, and the cathode of the common cathode diode group 11 and the anode of the common anode diode group 12 are connected to the first terminal and the second terminal of the inverter and rectifier integrated unit 1:

[0043] A plurality of capacitors C are connected in parallel between the cathode of the common cathode diode group 11 and the anode of the common anode diode group 12 .

[0044] In this embodiment, Figure 1 As shown, the common cathode diode group 11 includes: three common cathode diodes VT1, VT3, VT5, the cathodes of each common cathode diode VT1, VT3, VT5 are connected, and the anodes of each common cathode diode VT1, VT3, VT5 are respectively connected to one phase of the three-phase input power supply;

[0045] The common anode diode group 12 includes: three common anode diodes VT2, VT4, VT6, the anodes of each common anode diode VT2, VT4, VT6 are connected, and the cathodes of each common anode diode VT2, VT4, VT6 are respectively connected to one phase of the three-phase input power supply.

[0046] Specifically, in this embodiment, the three-phase bridge rectifier unit 1 actually controls the conduction and disconnection of the common cathode diode and the common anode diode, and when the input end of the three-phase bridge rectifier unit 1 is connected to the three-phase input power supply and the third terminal and the fourth terminal of the inverter and rectifier integrated unit 2 are not connected to the AC input power supply, the three-phase input power supply is rectified into three-phase DC power and output to the external device;

[0047] Taking the resistor R as the load as an example, the working process of the three-phase rectification of the three-phase bridge rectifier unit 1 is introduced. The common cathode diodes VT1, VT3, and VT5 are composed of a common cathode diode group 11, and the common anode diodes VT2, VT4, and VT6 are composed of a common anode diode group 12. For the three diodes of the common cathode diode group 11, the diode with the highest AC voltage connected to the anode is turned on, and for the three diodes of the common anode diode group, the diode with the lowest AC voltage connected to the cathode is turned on. Therefore, at any time of the three-phase bridge rectifier unit, one diode in the common anode diode group and one diode in the common cathode diode group are turned on.

[0048] For example, between Wt1 and Wt2, the voltage of U phase is the highest and the voltage of V phase is the lowest, then diodes VT1 and VT6 are turned on at the same time, and the current flows: U phase->diode VT1->resistor R->diode VT6->V phase, and the voltage on resistor R is the line voltage Uuv between U phase and V phase. At Wt2, the voltage of U phase is the highest and the voltage of W phase is the lowest. At this time, diodes VT1 and VT2 are turned on at the same time, and diode VT6 is turned off. The current flows: U phase->diode VT1->resistor R->diode VT2->W phase, and the voltage on resistor R is the line voltage Uuw between U phase and W phase, and so on. The voltages on the turned-on diodes and resistor R are shown in Table 1 below.

[0049] Table 1 Voltage comparison table

[0050]

[0051] When the common cathode diode group is turned on, the rectifier output voltage Ud1 is the envelope of the phase voltage in the positive half cycle. When the common anode diode group is turned on, the rectifier output voltage Ud2 is the envelope of the phase voltage in the negative half cycle. The total rectifier output voltage Ud = Ud1-Ud2 is the difference between the two envelopes. When it is applied to the line voltage waveform, it is the envelope of the line voltage in the positive half cycle. Figure 2 shown.

[0052] In a preferred embodiment of the utility model, when the three-phase bridge rectifier unit 1 outputs direct current, the inverter and rectifier integrated unit 2 includes a first bridge arm and a second bridge arm connected in parallel and a second capacitor;

[0053] The first connection terminal of the first bridge arm and the first connection terminal of the second bridge arm are connected to the first output terminal of the three-phase bridge rectifier unit, and the second connection terminal of the first bridge arm and the second connection terminal of the second bridge arm are connected to the second output terminal of the three-phase bridge rectifier unit;

[0054] The midpoint of the first bridge arm serves as the third terminal of the inverter and rectifier integrated unit, and the midpoint of the second bridge arm serves as the fourth terminal of the inverter and rectifier integrated unit.

[0055] In a preferred embodiment of the present invention, the first bridge arm comprises:

[0056] A first switch device, one end of the first switch device is connected to one end of the resistor R, the other end of the first switch device is connected to one end of the second switch device, and the other end of the second switch device is connected to the other end of the resistor R;

[0057] A first controller is connected to two ends and a conduction end of the first switch device and the second switch device respectively;

[0058] The other end of the first switch device serves as the midpoint of the first bridge arm.

[0059] In a preferred embodiment of the present utility model, the second bridge arm comprises:

[0060] a third switch device, one end of the third switch device is connected to one end of the resistor R, the other end of the third switch device is connected to one end of the fourth switch device, and the other end of the fourth switch device is connected to the other end of the resistor R;

[0061] A second controller is connected to two ends and a conduction end of the third switch device and the fourth switch device respectively;

[0062] The other end of the third switch device serves as the midpoint of the second bridge arm.

[0063] Specifically, in this embodiment, when the input end of the three-phase bridge rectifier unit 1 is connected to the three-phase input power supply and the third terminal and the fourth terminal of the inverter and rectifier integrated unit 2 are not connected to the AC input power supply, the inverter and rectifier integrated unit 2 inverts the direct current obtained by the three-phase rectification of the three-phase bridge rectifier unit 1 into alternating current (AC-DC);

[0064] like Figure 3 , 4 As shown, the inverter and rectifier integrated unit 2 includes four fully controlled switch devices (switch device 1, switch device 2, switch device 3 and switch device 4) to form two groups of bridge arms of the full-bridge inverter circuit (switch device 1 and switch device 2 are the first bridge arm, and switch device 3 and switch device 4 are the second bridge arm). The two switch devices on the diagonal have the same working state, that is, they are turned off and turned on at the same time. That is, switch device 1 and switch device 4 form a group of loops, and switch device 2 and switch device 3 form a group of loops. The four switch devices are controlled by the first controller and the second controller according to the preset sequence trigger pulse, so that the two loops are alternately turned on at the same switching frequency.

[0065] When switch device 1 and switch device 4 are turned on and switch device 2 and switch device 3 are turned off, the current flows as follows: Figure 3 As shown;

[0066] When switch device 2 and switch device 3 are turned on and switch device 1 and switch device 4 are turned off, the current flows as follows: Figure 4 As shown;

[0067] In this embodiment, the switch device may be composed of an NPN transistor as shown in 3 with a diode connected in parallel at the emitter and collector;

[0068] The full-bridge inverter conversion function (AC-DC) is realized in the above manner.

[0069] In a preferred embodiment of the utility model, when the third terminal and the fourth terminal of the inverter and rectifier integrated unit are connected to an AC input power supply, the AC input power supply is single-phase full-bridge rectified into DC power and output from the first terminal and the second terminal to the external device.

[0070] Specifically, in this embodiment, in the aforementioned embodiment, the switch device adopts Figure 3 The NPN transistor shown in FIG. 1 is composed of diodes connected in parallel on the emitter and the collector. When the first controller and the second controller control the NPN transistors in each switch device to turn off, each switch device is equivalent to a diode. The equivalent circuit diagram is shown in FIG. Figure 5 As shown;

[0071] The AC power input current cycle is 0-2π;

[0072] During the period from 0 to π, the first diode D1 and the fourth diode D4 are turned on, and the second diode D2 and the third diode D3 are turned off. A positive voltage is obtained on the resistor R, and the direction of the current and the DC waveform obtained are as follows: Figure 6 and Figure 8 shown.

[0073] During the period of π to 2π, the second diode D2 and the third diode D3 are turned on and off, and the first diode D1 and the fourth diode D4 are turned off. The voltage obtained on the resistor R is still positive at the top and negative at the bottom. The direction of the current and the DC waveform obtained are as follows: Figure 7 and Figure 8 shown.

[0074] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of this specification and illustrations should be included in the protection scope of the present invention.

Claims

1. A bridge rectifier power module with controllable inverter output, characterized in that: include: A resistor, both ends of which are connected to an external device as power supply ends, and both ends of the resistor are connected in parallel with a first capacitor and grounded; A three-phase bridge rectifier unit, wherein the output end of the three-phase bridge rectifier unit is connected to the two ends of the resistor, and is used for rectifying the AC power input by the three-phase input power supply into DC power by three-phase full-bridge when the input end of the three-phase bridge rectifier unit is connected to the three-phase input power supply; An inverter and rectifier integrated unit, wherein the first terminal and the second terminal of the inverter and rectifier integrated unit are respectively connected to the two ends of the resistor, and are used to invert the DC full-bridge output of the three-phase bridge rectifier unit into AC power and output it from the third terminal and the fourth terminal of the inverter and rectifier integrated unit; When the third terminal and the fourth terminal of the inverter and rectifier integrated unit are connected to an AC input power source, they are used to rectify the AC power input by the AC input power source into DC power through a single-phase full-bridge rectification and output it to the external device from the first terminal and the second terminal.

2. The bridge rectifier power module according to claim 1, characterized in that: The three-phase bridge rectifier unit includes a common cathode diode group and a common anode diode group, wherein the cathode of the common cathode diode group and the anode of the common anode diode group are connected to the first terminal and the second terminal of the inverter and rectifier integrated unit: A plurality of capacitors are connected in parallel between the cathode of the common cathode diode group and the anode of the common anode diode group.

3. The bridge rectifier power module according to claim 2, characterized in that: The common cathode diode group comprises: Three common cathode diodes, the cathodes of the common cathode diodes are connected, and the anodes of the common cathode diodes are respectively connected to one phase of a three-phase input power supply; The common anode diode group comprises: There are three common anode diodes, the anodes of the common anode diodes are connected, and the cathodes of the common anode diodes are respectively connected to one phase of the three-phase input power supply.

4. The bridge rectifier power module according to claim 1, characterized in that: The inverter and rectifier integrated unit comprises a first bridge arm and a second bridge arm connected in parallel and a second capacitor; The first wiring end of the first bridge arm and the first wiring end of the second bridge arm are connected to one end of the resistor, and the second wiring end of the first bridge arm and the second wiring end of the second bridge arm are connected to the other end of the resistor; The midpoint of the first bridge arm serves as the third terminal of the inverter and rectifier integrated unit, and the midpoint of the second bridge arm serves as the fourth terminal of the inverter and rectifier integrated unit.

5. The bridge rectifier power module according to claim 4, characterized in that: The first bridge arm comprises: a first switch device, wherein one end of the first switch device is connected to one end of the resistor, the other end of the first switch device is connected to one end of the second switch device, and the other end of the second switch device is connected to the other end of the resistor; A first controller, connected to two ends and a conduction end of the first switch device and the second switch device respectively; The other end of the first switch device serves as the midpoint of the first bridge arm.

6. The bridge rectifier power module according to claim 4, characterized in that: The second bridge arm comprises: a third switch device, one end of the third switch device being connected to one end of the resistor, the other end of the third switch device being connected to one end of a fourth switch device, the other end of the fourth switch device being connected to the other end of the resistor; A second controller, connected to two ends and a conduction end of the third switch device and the fourth switch device respectively; The other end of the third switch device serves as the midpoint of the second bridge arm.

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