Power supply circuit management system

Abstract

This power circuit management system, relating to the field of power quality management devices, includes: a housing equipped with a single-phase power interface and a user load interface; a filter module connected to an external power source via the single-phase power interface; a PFC module connected to the filter module and an energy storage capacitor for rectification and boosting to obtain and store the boosted DC power in the energy storage capacitor; an inverter module connected to the energy storage capacitor to invert the power into AC power; and a bypass control module to control whether the AC power is output to the user load. In this invention, voltage regulation can be initiated when the circuit voltage does not meet a preset value. Energy is stored and released through a pre-charging circuit, rectified and boosted by the PFC module to obtain a boosted DC current, and then inverted by the inverter module to output a normal AC voltage. The output is connected to the user end via the switched bypass control module, thereby ensuring a stable voltage output at the user end.

Description

Technical Field

[0001] This invention relates to the field of power quality management devices, and more specifically, to power circuit management systems. Background Technology

[0002] With the increasing capacity of power distribution networks, the power quality in the power grid is also becoming increasingly polluted. Therefore, how to purify power quality, improve the power grid operating environment, and further save energy has become a research direction for power systems.

[0003] Currently, there are many mature devices available for improving power quality. These include adding fixed compensation capacitors or shunt reactors to the power grid for regulation. Voltage-regulating reactive power compensation systems use voltage regulators to compensate for reactive power in the power grid system. Each piece of equipment in this system is installed on a concrete foundation, connected by copper busbars and wires, and protected by a fence. This results in a large footprint and outdoor installation, exposing the equipment to wind and sun all day, which not only shortens its lifespan but also makes it susceptible to external influences, causing short circuits and open circuits. Furthermore, repeated disassembly and reassembly after installation is difficult, and forced disassembly inevitably damages the equipment. Summary of the Invention

[0004] The present invention aims to overcome at least one of the defects (deficiencies) of the prior art and provide a power circuit management system to solve the problem that the voltage regulation module and its circuit are susceptible to the influence of the installation environment.

[0005] The technical solution adopted in this invention is,

[0006] A power circuit management system, which connects to an external power source and regulates the output to the user, includes:

[0007] The voltage regulating box is provided with a single-phase power interface and a user load interface. An integrated plug is provided on one side of the voltage regulating box, and an integrated socket that can be used with the integrated plug is provided on the other opposite side of the voltage regulating box.

[0008] A voltage regulating module, comprising:

[0009] The first filter circuit is located inside the voltage regulating box and connected to an external power supply through the single-phase power interface, and is used to filter the external power supply.

[0010] The first PFC circuit is located in the voltage regulating box and connected to the first filter circuit. It is also connected to the first energy storage capacitor. It is used to rectify and boost the external power supply after filtering by the first filter circuit to obtain boosted DC power supply, and store the boosted DC power supply in the first energy storage capacitor.

[0011] A first pre-charging circuit is provided in the housing and connected between the first filter circuit and the first PFC circuit, and is used to control the first PFC circuit to store the boosted DC power in the first energy storage capacitor.

[0012] The first inverter circuit is located inside the voltage regulating box and connected to the first energy storage capacitor, and is used to invert the boosted DC power stored in the first energy storage capacitor into AC power.

[0013] A bypass control circuit is located inside the voltage regulating box and connected to the first inverter circuit, used to control whether the AC power supply is output to the user load through the user load interface.

[0014] The control system is located inside the voltage regulating box and connected to the external power supply through the single-phase power interface. It is also connected to the first filter circuit, the first PFC circuit, and the first inverter circuit. The control system is used to detect whether the voltage of the external power supply is lower than a set value, and to send control signals to the first PFC circuit and / or the first pre-charge circuit and / or the first inverter circuit according to the detection result.

[0015] This invention further designs a modular enclosure, using a universal plug and socket to connect enclosures, allowing complex systems to be modularly assembled in the power box for more flexible applications. To achieve the desired user-level output voltage, the invention uses a control system to measure the input circuit voltage parameters and determine if it meets the user's requirements. If it does, the control system directly outputs the voltage to the user via a non-switching bypass control loop. If it does not meet the requirements, a voltage regulation program is initiated, generating a voltage regulation signal, including: storing and releasing electrical energy through an energy storage capacitor, and regulating the voltage through a PFC circuit. The DC current is boosted to obtain a boosted DC current, which is then inverted through an inverter circuit to output a normal AC voltage. The output is connected to the user end through a switching bypass control circuit, thereby stabilizing the voltage output at the user end and ensuring a stable voltage output at the user end. In specific circuit voltage regulation application scenarios, there is no box that can modularize or package the circuit to simplify the simple and repetitive installation of the single-phase voltage regulation system. When inspecting the subsequent working circuit, the modular box structure allows the inspector to selectively check according to the box packaging characteristics, saving the time that the operator needs to re-inspect the circuit wiring, and also saving inspection costs.

[0016] In a preferred embodiment, the first pre-charge circuit has two parallel branches, one branch has a short-circuit switch K3, and the other branch has a load switch K2. The load switch K2 is also connected in series with a load resistor R1 in the branch.

[0017] Specifically, the system contains a large energy storage capacitor. If there is no pre-charging circuit, the voltage across the capacitor will be close to 0 at the moment of power-on. This is equivalent to a momentary short circuit, which will generate a large inrush current and cause damage to relays and other components.

[0018] When the first pre-charge circuit is working, the short-circuit switch K3 is open, and the load switch K2 is closed to charge the device through the resistor R1. The resistor R1 acts as a current limiter. After stabilization, the load switch K2 is opened, and the short-circuit switch K3 is closed. This achieves charging protection for the device. The present invention further describes the charging method of the first pre-charge circuit, which realizes the charging and discharging of the circuit by controlling the state of the switches and load capacitors on the two branches, avoiding the impact of sudden current changes in the circuit on the system.

[0019] As a preferred embodiment, it further includes:

[0020] The expansion enclosure has a single-phase power interface and an expansion output interface on its exterior. The integrated plug is located on one side of the expansion enclosure, and the integrated socket is located on the opposite side of the expansion enclosure.

[0021] An expansion module is located inside the expansion box. The input terminal of the expansion module is connected to the external power supply through the single-phase power interface and to the input terminal of the first filter circuit. The output terminal of the expansion module is connected to the input terminal of the bypass control circuit through the expansion output interface, which is used to increase the capacity of the voltage regulation module.

[0022] To increase the circuit capacity, the present invention further includes an expansion module and its modular expansion housing, and the expansion module is connected in parallel with the voltage regulation module to further increase the capacity based on the voltage regulation module circuit. The expansion module and the voltage regulation module share the control system.

[0023] In a preferred embodiment, the expansion module includes:

[0024] The second filtering circuit is connected to the external power supply through the single-phase power interface and is used to filter the external power supply.

[0025] The second PFC circuit is connected to the control system and the second filter circuit, and is also connected to the second energy storage capacitor. It is used to rectify and boost the external power supply after filtering by the second filter circuit to obtain boosted DC power supply, and store the boosted DC power supply in the second energy storage capacitor.

[0026] The second pre-charging circuit is located in the voltage regulating box and is respectively connected to the second PFC circuit and the control system. It is used to control the second PFC circuit to store the boosted DC power in the energy storage capacitor.

[0027] The second inverter circuit is connected to the control system, the second energy storage capacitor and the bypass control circuit, and is used to invert the boosted DC power stored in the second energy storage capacitor into AC power and output it to the bypass control circuit.

[0028] The control system is further configured to send control signals to the second PFC circuit and / or the second precharge circuit and / or the second inverter circuit based on the detection results.

[0029] This invention provides a specific expansion module setting. By adding a functional circuit equivalent to that in the voltage regulation module, the circuit's capacity for parameters such as current is increased while achieving the same voltage regulation function, thus avoiding the influence of high-current power supplies on the voltage regulation circuit.

[0030] As a preferred embodiment, it further includes:

[0031] The compensation box is provided with a single-phase power interface and a compensation output interface on its exterior. An integrated plug is provided on one side of the compensation box, and an integrated socket is provided on the opposite side of the compensation box.

[0032] A compensation module is located inside the compensation box. The input terminal of the compensation module is connected to the external power supply through the single-phase power interface and is also connected to the input terminal of the first filter circuit. The output terminal of the compensation module is connected to the input terminal of the bypass control circuit, and is used to perform reactive power compensation on the external power supply.

[0033] In a preferred embodiment, the compensation module is provided with several compensation branches and relays that control the switches of each compensation branch. Each compensation branch is connected to the external power supply through the single-phase power interface, and the control system is connected to the relays.

[0034] To achieve reactive power compensation in the circuit, this invention further designs a reactive power compensation enclosure and its circuit. Through the connection and control of the control system, the required reactive power compensation capacity is calculated based on the acquired current data, and the switching of relays on each branch is controlled to dynamically adjust the compensation capacity.

[0035] Specifically, there are 3 compensation branches, each with a compensation capacitor, and the relay includes two parallel switches, one of which is connected in series with a load resistor. The compensation capacity of each compensation branch is 3.3Kvar, and the reactive power compensation capacity is 10Kvar.

[0036] As a preferred embodiment, it further includes:

[0037] The treatment enclosure is provided with a single-phase power interface and a treatment output interface on its exterior.

[0038] Power quality management module, the power quality management module includes:

[0039] The third filter circuit is located inside the treatment box and connected to the external power supply through the single-phase power interface, and is used to filter the external power supply.

[0040] An inductor filter circuit is installed inside the treatment box and connected to the third filter circuit, and is used to further filter the external power supply after the third filter circuit has filtered it.

[0041] A rectifier circuit is located inside the treatment box and connected to the inductor filter circuit. It is used to rectify the external power supply filtered by the inductor filter circuit to obtain rectified DC power supply.

[0042] A DC energy storage circuit is located inside the treatment box and connected to the rectifier circuit and the bypass control circuit. It stores the DC power rectified by the rectifier circuit and releases the stored rectified DC power to the bypass control circuit through the treatment output interface.

[0043] The third pre-charging circuit is located inside the treatment box and connected between the third filter circuit and the inductor filter circuit. It is used to control the DC energy storage circuit to store the DC power rectified by the rectifier circuit.

[0044] In this invention, the power quality comprehensive management module mainly consists of a filter circuit, a pre-charging circuit, an inductor filter circuit, a rectifier circuit, a DC energy storage circuit, and a control circuit. By sampling the input current, the control signals of the pre-charging circuit, the inductor filter circuit, the rectifier circuit, the DC energy storage circuit, and the control circuit are determined, so as to realize the power quality management function in an orderly manner.

[0045] In a preferred embodiment, the rectifier circuit has several bridge arms connected in parallel, and each bridge arm has four switching transistors connected in series.

[0046] An input terminal is provided between the two middle switching transistors on each bridge arm, and the inductor filter circuit is connected to the input terminal;

[0047] The two middle switches on each bridge arm are connected in parallel to form a parallel branch. Each parallel branch has two diodes connected in series. An output terminal is provided between the two diodes on each parallel branch. The DC energy storage circuit is connected to the output terminal.

[0048] To rectify the filtered power supply, this invention further designs a three-phase three-level rectifier circuit, specifically a three-phase three-level VSR fully controlled bridge circuit. The rectifier circuit adopts PWM rectification technology and has bidirectional four-quadrant performance, achieving requirements such as energy saving, improved power quality, and complex control applications. This gives the product advantages such as high efficiency, low cost, small size, and strong functionality.

[0049] In a preferred embodiment, the integrated socket provided in the expansion box is matched and connected with the integrated plug provided in the voltage regulating box, or the integrated plug provided in the expansion box is matched and connected with the integrated socket provided in the voltage regulating box.

[0050] In a preferred embodiment, the integrated socket provided in the compensation box is matched and connected with the integrated plug provided in the voltage regulating box, or the integrated plug provided in the compensation box is matched and connected with the integrated socket provided in the voltage regulating box.

[0051] In a preferred embodiment, the integrated plug and the integrated socket are provided with LN holes, communication holes and signal holes on opposite sides. The LN holes are used to set the single-phase power interface and the user load interface. The communication holes are used to realize communication connection between adjacent power boxes. The signal holes are used to provide various specific control signals to the circuit regulation system.

[0052] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0053] The enclosure structure integrates complex circuits within the enclosure, and the voltage regulation, compensation, and power management between multi-phase power supplies are achieved through multi-enclosure combination.

[0054] Meanwhile, by setting up a pre-charging circuit, a PFC module, and an inverter module, this invention rectifies and boosts AC power that does not meet power requirements, and switches the power polarity at the output terminal through the inverter module, so that DC is converted back to AC, further simplifying the circuit structure.

[0055] The present invention further incorporates a pre-charging circuit to prevent a momentary short circuit across the capacitor upon power-up, which could generate a large inrush current and damage other components such as relays, thus providing charging protection. Attached Figure Description

[0056] Figure 1 This is a system block diagram of the voltage regulating module of the present invention.

[0057] Figure 2 This is a structural diagram of the voltage regulating module of the present invention.

[0058] Figure 3 This is a structural diagram of the first filter circuit of the voltage regulation module of the present invention.

[0059] Figure 4 This is a structural diagram of the first pre-charge circuit of the voltage regulation module of the present invention.

[0060] Figure 5 This is a structural diagram of the first PFC circuit of the voltage regulating module of the present invention.

[0061] Figure 6 This is a structural diagram of the first inverter circuit of the voltage regulation module of the present invention.

[0062] Figure 7 This is a structural diagram of the bypass control circuit of the voltage regulating module of the present invention.

[0063] Figure 8 This is a structural diagram of the control system of the present invention.

[0064] Figure 9 This is a system block diagram of the expansion module of the present invention.

[0065] Figure 10 This is a structural diagram of the expansion module of the present invention.

[0066] Figure 11 This is a structural diagram of the combination of the voltage regulating module and the capacity expansion module of the present invention.

[0067] Figure 12 This is a system block diagram of the compensation module of the present invention.

[0068] Figure 13 This is a structural diagram of the compensation module of the present invention.

[0069] Figure 14 This is a system block diagram of the power quality management module of the present invention.

[0070] Figure 15 This is a structural diagram of the power quality management module of the present invention.

[0071] Figure 16 This is a structural diagram of the third filter circuit of the power quality management module of the present invention.

[0072] Figure 17 This is a top view of the integrated socket of the present invention.

[0073] Figure 18 This is a side view of the integrated plug of the present invention.

[0074] Figure 19 This is a structural diagram of the housing of the present invention.

[0075] In the diagram, the components are: voltage regulation module 100, first filter circuit 110, first pre-charge circuit 120, first PFC circuit 130, first inverter circuit 140, bypass control circuit 150, control system 160, expansion module 200, second filter circuit 210, second pre-charge circuit 220, second PFC circuit 230, second inverter circuit 240, power quality management module 300, third filter circuit 310, third pre-charge circuit 320, inductor filter circuit 330, rectifier circuit 340, DC energy storage circuit 350, LN port 410, communication port 420, and signal port 430. Detailed Implementation

[0076] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention. To better illustrate the following embodiments, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions; it is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0077] Example 1

[0078] like Figure 1 As shown in this embodiment:

[0079] A power circuit management system, which connects to an external power source and regulates the output to the user, includes:

[0080] The voltage regulating box is provided with a single-phase power interface and a user load interface. An integrated plug is provided on one side of the voltage regulating box, and an integrated socket that can be used with the integrated plug is provided on the other opposite side of the voltage regulating box.

[0081] Voltage regulating module 100, the voltage regulating module 100 includes:

[0082] The first filter circuit 110 is located inside the voltage regulating box and connected to an external power supply through the single-phase power interface, and is used to filter the external power supply.

[0083] The first PFC circuit 130 is located in the voltage regulating box and connected to the first filter circuit 110. It is also connected to the first energy storage capacitor. It is used to rectify and boost the external power supply after filtering by the first filter circuit 110 to obtain boosted DC power supply, and store the boosted DC power supply in the first energy storage capacitor.

[0084] The first pre-charging circuit 120 is located in the housing and connected between the first filter circuit 110 and the first PFC circuit 130, and is used to control the first PFC circuit 130 to store the boosted DC power in the first energy storage capacitor.

[0085] The first inverter circuit 140 is located inside the voltage regulating box and connected to the first energy storage capacitor, and is used to invert the boosted DC power stored in the first energy storage capacitor into AC power.

[0086] A bypass control circuit 150 is located inside the voltage regulating box and connected to the first inverter circuit 140, used to control whether the AC power supply is output to the user load through the user load interface.

[0087] The control system 160 is located inside the voltage regulating box and connected to the external power supply through the single-phase power interface. It is also connected to the first filter circuit 110, the first PFC circuit 130, and the first inverter circuit 140, respectively. The control system is used to detect whether the voltage of the external power supply is lower than a set value, and to send control signals to the first PFC circuit 130 and / or the first pre-charge circuit 120 and / or the first inverter circuit 140 according to the detection result.

[0088] This invention designs a modular enclosure, using a universal plug and socket to connect enclosures, allowing complex systems to be modularly assembled in the power box for more flexible applications. To achieve the desired user-level output voltage, the invention uses a control system 160 to measure the input circuit voltage parameters and determine if it meets the user's requirements. If it does, the control system 160 directly controls the output to the user terminal via a non-switching bypass control loop 150. If it does not meet the requirements, a voltage regulation program is initiated, generating a voltage regulation signal, including: storing and releasing electrical energy through an energy storage capacitor, and using a PFC circuit. The system rectifies and boosts the voltage to obtain a boosted DC current, which is then inverted through an inverter circuit to output a normal AC voltage. The output is connected to the user terminal via a switching bypass control circuit 150, thus stabilizing the voltage output at the user terminal and ensuring a stable voltage output. In specific circuit voltage regulation applications, there is no modular or encapsulated enclosure to simplify the repetitive installation of single-phase voltage regulation systems. During subsequent circuit inspections, the modular enclosure structure allows inspectors to selectively check based on the enclosure's encapsulation characteristics, saving time that would otherwise be required to re-inspect the circuit wiring and reducing inspection costs.

[0089] like Figure 2 , 3As shown, in a preferred embodiment, the first filter circuit 110 is provided with a safety capacitor to reduce electromagnetic interference in the circuit.

[0090] The external power interface includes an L input terminal, an N input terminal, and a ground terminal. The safety capacitor R2 is connected in parallel between the L input terminal and the N input terminal. The N input terminal is grounded through the safety capacitor R6, and the L input terminal is grounded through the safety capacitor R7.

[0091] like Figure 2 , 4 As shown, in a preferred embodiment, the first pre-charge circuit 120 has two parallel branches. One branch has a short-circuit switch K3, and the other branch has a load switch K2. The load switch K2 is also connected in series with a load resistor R1 in the branch.

[0092] Specifically, the system has a large energy storage capacitor. If there is no first pre-charging circuit 120, the voltage across the capacitor will be close to 0 at the moment of power-on. This is equivalent to a momentary short circuit, which will generate a large inrush current and cause damage to the relay and other components.

[0093] When the first pre-charge circuit 120 is working, the short-circuit switch K3 is open, and the load switch K2 is closed to charge the device through the resistor R1. The resistor R1 acts as a current limiter. After stabilization, the load switch K2 is opened, and the short-circuit switch K3 is closed. This achieves charging protection for the device. The present invention further describes the charging method of the first pre-charge circuit 120. By controlling the state of the switches and load capacitors on the two branches, the charging and discharging of the circuit is realized, avoiding the impact of sudden current changes in the circuit on the system.

[0094] like Figure 2 , 5 As shown, in a preferred embodiment, the unidirectional power interface includes an L input terminal and an N input terminal. The first PFC circuit 130 is provided with a rectifier bridge, which includes a first input terminal, a second input terminal, a third output terminal, and a fourth output terminal. The first input terminal is connected to the output terminal of the pre-charge circuit, the second input terminal is connected to the N input terminal, and the third and fourth output terminals are respectively connected to the positive and negative terminals of the energy storage capacitor.

[0095] In a preferred embodiment, a first branch, a second branch, and a third branch are connected between the third output terminal and the positive terminal of the energy storage capacitor. The first branch, the second branch, and the third branch are connected in parallel. The first branch is provided with a shunt diode D1, the second branch is provided with a series-connected loop inductor L1 and a boost diode D2, and the third branch is provided with a series-connected loop inductor L2 and a boost diode D4.

[0096] Specifically, in the first PFC circuit 130, the circuit inductors L1 and L2 store energy when the IGBT switching transistors Q3 and Q4 are turned on. When the switching transistors are turned off, a voltage with the right side positive and the left side negative is induced on the circuit inductors L1 and L2. The energy stored during the turn-on is used to charge the energy storage capacitor C2 through the boost diodes D2 and D4, and the energy is output.

[0097] In this invention, the energy storage capacitor C2 and the loop inductors L1 and L2 after the first PFC circuit 130 are connected in series. Since the current in the loop inductors L1 and L2 cannot change abruptly, it limits the surge current of the energy storage capacitor C2. Without the limiting effect of the inductors, the branch containing the other shunt diode D1 would actually have a greater impact on the energy storage capacitor C2, but it can protect the boost diodes D2 and D4, especially the switching transistors Q3 and Q4. Since the switching transistors Q3 and Q4 are turned off when the inductor current is not zero, they need to withstand greater stress. The boost diodes D2 and D4 are fast recovery diodes, requiring extremely low or even zero reverse recovery current; therefore, their surge current withstand capability is relatively weak. Reducing the reverse recovery current and increasing the surge voltage carrying capacity are mutually restrictive; therefore, the shunt diode D1 uses a common rectifier diode, which has a strong surge current withstand capability.

[0098] In a preferred embodiment, a switching transistor Q3 is connected between the fourth output terminal and the output terminal of the loop inductor L1, and a switching transistor Q4 is connected between the fourth output terminal and the output terminal of the loop inductor L2.

[0099] like Figure 2 , 6 As shown, in a preferred embodiment, the first inverter circuit 140 includes two parallel bridge arms, each connected in parallel with the energy storage capacitor. One bridge arm is equipped with a switch Q9 and a switch Q10, and the other bridge arm is equipped with a switch Q11 and a switch Q12. When switches Q9 and Q11 are turned on, switches Q10 and Q12 are turned off. When switches Q9 and Q11 are turned off, switches Q10 and Q12 are turned on. Switches Q9 and Q11 are simultaneously turned on and off, and switches Q10 and Q12 are simultaneously turned on and off. A port is provided between switches Q10 and Q9, and the port is connected to the bypass control module 500.

[0100] Specifically, when Q9 and Q11 are turned on and Q10 and Q12 are turned off, the output terminal is connected to the positive terminal of the DC power supply after inversion, and the output voltage between the two output terminals is Uun = Uc, where Uc is the DC power supply voltage value; when Q10 and Q12 are turned on and Q9 and Q11 are turned off, the output terminal is connected to the negative terminal of the DC power supply after inversion, and the output voltage is Uun = -Uc.

[0101] like Figure 2 , 7 As shown, in a preferred embodiment, the bypass control module is also connected to an external power source through the single-phase power interface to control whether the external power source is output to the user load through the user load interface.

[0102] In a preferred embodiment, the system includes an input voltage measurement circuit and an output voltage and current measurement circuit, which are used to detect the input or output circuit parameters, respectively.

[0103] like Figure 2 , 8 As shown, the control system 160 includes an STM32 chip, which samples the input voltage to determine the control signals of the first PFC circuit 130, the first inverter circuit 140, and the bypass control circuit 150, thereby achieving orderly voltage regulation.

[0104] like Figure 9 As shown, in a preferred embodiment, it further includes:

[0105] The expansion enclosure has a single-phase power interface and an expansion output interface on its exterior. The integrated plug is located on one side of the expansion enclosure, and the integrated socket is located on the opposite side of the expansion enclosure.

[0106] An expansion module 200 is disposed inside the expansion box. The input terminal of the expansion module 200 is connected to the external power supply through the single-phase power interface and is also connected to the input terminal of the first filter circuit 110. The output terminal of the expansion module 200 is connected to the input terminal of the bypass control circuit 150 through the expansion output interface, which is used to increase the capacity of the voltage regulating module 100.

[0107] To increase the circuit capacity, the present invention further provides an expansion module 200 and its modular expansion housing, and sets the expansion module 200 and the voltage regulating module 100 in parallel, further increasing the capacity based on the circuit of the voltage regulating module 100. The expansion module 200 and the voltage regulating module 100 share the control system 160.

[0108] like Figure 10 , 11 As shown, in a preferred embodiment, the expansion module 200 includes:

[0109] The second filter circuit 210 is connected to the external power supply through the single-phase power interface and is used to filter the external power supply.

[0110] The second PFC circuit 230 is connected to the control system 160 and the second filter circuit 210, and is also connected to the second energy storage capacitor. It is used to rectify and boost the external power supply filtered by the second filter circuit 210 to obtain boosted DC power supply, and store the boosted DC power supply in the second energy storage capacitor.

[0111] The second pre-charging circuit 220 is located in the voltage regulating box and is respectively connected to the second PFC circuit 230 and the control system 160. It is used to control the second PFC circuit 230 to store the boosted DC power in the energy storage capacitor.

[0112] The second inverter circuit 240 is connected to the control system 160, the second energy storage capacitor and the bypass control circuit 150, and is used to invert the boosted DC power stored in the second energy storage capacitor into AC power and output it to the bypass control circuit 150.

[0113] The control system 160 is further configured to send control signals to the second PFC circuit 230 and / or the second precharge circuit 220 and / or the second inverter circuit 240 based on the detection results.

[0114] The present invention provides a specific expansion module 200 configuration, which further adds a functional circuit equivalent to that in the voltage regulation module 100, thereby increasing the capacity of the circuit for parameters such as current while achieving the same voltage regulation function, and avoiding the influence of high current power supply on the voltage regulation circuit.

[0115] like Figure 12 As shown, in a preferred embodiment, it further includes:

[0116] The compensation box is provided with a single-phase power interface and a compensation output interface on its exterior. An integrated plug is provided on one side of the compensation box, and an integrated socket is provided on the opposite side of the compensation box.

[0117] The compensation module is located inside the compensation box. The input terminal of the compensation module is connected to the external power supply through the single-phase power interface and is also connected to the input terminal of the first filter circuit 110. The output terminal of the compensation module is connected to the input terminal of the bypass control circuit 150, and is used to perform reactive power compensation on the external power supply.

[0118] like Figure 13As shown, in a preferred embodiment, the compensation module is provided with several compensation branches and relays that control the switches of each compensation branch respectively. Each compensation branch is connected to the external power supply through the single-phase power interface, and the control system 160 is connected to the relays.

[0119] To achieve reactive power compensation in the circuit, this invention further designs a reactive power compensation enclosure and its circuit. Through the connection and control of the control system 160, the required reactive power compensation capacity is calculated based on the acquired current data, and the switching of relays on each branch is controlled to dynamically adjust the compensation capacity.

[0120] Specifically, there are 3 compensation branches, each with a compensation capacitor, and the relay includes two parallel switches, one of which is connected in series with a load resistor. The compensation capacity of each compensation branch is 3.3Kvar, and the reactive power compensation capacity is 10Kvar.

[0121] like Figure 14-16 As shown, in a preferred embodiment, it further includes:

[0122] The treatment enclosure is provided with a single-phase power interface and a treatment output interface on its exterior.

[0123] Power quality management module, the power quality management module includes:

[0124] The third filter circuit 310 is located inside the treatment box and connected to the external power supply through the single-phase power interface, and is used to filter the external power supply.

[0125] An inductor filter circuit 330 is disposed in the treatment box and connected to the third filter circuit 310, and is used to further filter the external power supply after the third filter circuit 310 has filtered it.

[0126] A rectifier circuit 340 is disposed in the treatment box and connected to the inductor filter circuit 330, and is used to rectify the external power supply filtered by the inductor filter circuit 330 to obtain rectified DC power supply.

[0127] A DC energy storage circuit 350 is located inside the treatment box and connected to the rectifier circuit 340 and the bypass control circuit 150. It stores the DC power rectified by the rectifier circuit 340 and releases the stored rectified DC power to the bypass control circuit 150 through the treatment output interface.

[0128] The third pre-charging circuit 320 is located inside the treatment box and connected between the third filter circuit 310 and the inductor filter circuit 330. It is used to control the DC energy storage circuit 350 to store the DC power rectified by the rectifier circuit 340.

[0129] In this invention, the power quality comprehensive management module mainly consists of a filter circuit, a pre-charging circuit, an inductor filter circuit 330, a rectifier circuit 340, a DC energy storage circuit 350, and a control circuit. By sampling the input current, the control signals of the pre-charging circuit, the inductor filter circuit 330, the rectifier circuit 340, the DC energy storage circuit 350, and the control circuit are determined, so as to orderly realize the power quality management function.

[0130] In a preferred embodiment, the rectifier circuit 340 is provided with a plurality of bridge arms connected in parallel, and each bridge arm is provided with four switching transistors connected in series.

[0131] An input terminal is provided between the two middle switching transistors on each bridge arm, and the inductor filter circuit 330 is connected to the input terminal;

[0132] The two middle switches on each bridge arm are connected in parallel to form a parallel branch. Each parallel branch has two diodes connected in series. An output terminal is provided between the two diodes on each parallel branch. The DC energy storage circuit 350 is connected to the output terminal.

[0133] To rectify the filtered power supply, this invention further designs a three-phase three-level rectifier circuit 340. Specifically, the rectifier circuit 340 is a three-phase three-level VSR fully controlled bridge circuit. The rectifier circuit 340 adopts PWM rectification technology and has bidirectional four-quadrant performance, achieving requirements such as energy saving, improved power quality, and complex control applications. This gives the product advantages such as high efficiency, low cost, small size, and strong functionality.

[0134] like Figure 17-19 As shown, in a preferred embodiment, the integrated socket provided in the expansion box is matched and connected with the integrated plug provided in the voltage regulating box, or the integrated plug provided in the expansion box is matched and connected with the integrated socket provided in the voltage regulating box.

[0135] In a preferred embodiment, the integrated socket provided in the compensation box is matched and connected with the integrated plug provided in the voltage regulating box, or the integrated plug provided in the compensation box is matched and connected with the integrated socket provided in the voltage regulating box.

[0136] In a preferred embodiment, the integrated plug and the integrated socket are provided with LN hole 410, communication hole 420 and signal hole 430 on opposite sides. LN hole 410 is used to set the single-phase power interface and the user load interface. Communication hole 420 is used to realize communication connection between adjacent power boxes. Signal hole 430 is used to provide a variety of specific control signals to the circuit regulation system.

[0137] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0138] The enclosure structure integrates complex circuits within the enclosure, and the voltage regulation, compensation, and power management between multi-phase power supplies are achieved through multi-enclosure combination.

[0139] Meanwhile, by setting up a pre-charging circuit, a PFC module, and an inverter module, this invention rectifies and boosts AC power that does not meet power requirements, and switches the polarity of the output power through the inverter module, so that DC is converted back to AC, further simplifying the circuit structure.

[0140] The present invention further incorporates a pre-charging circuit to prevent a momentary short circuit across the capacitor upon power-up, which could generate a large inrush current and damage other components such as relays, thus providing charging protection.

[0141] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A power circuit management system that connects to an external power source and regulates the output to the user, characterized in that: include: The voltage regulating box is provided with a single-phase power interface and a user load interface. An integrated plug is provided on one side of the voltage regulating box, and an integrated socket that can be used with the integrated plug is provided on the other opposite side of the voltage regulating box. A voltage regulating module, comprising: The first filter circuit is located inside the voltage regulating box and connected to an external power supply through the single-phase power interface, and is used to filter the external power supply. The first PFC circuit is located in the voltage regulating box and connected to the first filter circuit. It is also connected to the first energy storage capacitor. It is used to rectify and boost the external power supply after filtering by the first filter circuit to obtain boosted DC power supply, and store the boosted DC power supply in the first energy storage capacitor. A first pre-charging circuit is provided in the housing and connected between the first filter circuit and the first PFC circuit, and is used to control the first PFC circuit to store the boosted DC power in the first energy storage capacitor. The first inverter circuit is located inside the voltage regulating box and connected to the first energy storage capacitor, and is used to invert the boosted DC power stored in the first energy storage capacitor into AC power. A bypass control circuit is located inside the voltage regulating box and connected to the first inverter circuit, used to control whether the AC power supply is output to the user load through the user load interface. The control system is located inside the voltage regulating box and connected to the external power supply through the single-phase power interface. It is also connected to the first filter circuit, the first PFC circuit, and the first inverter circuit, respectively. The control system is used to detect whether the voltage of the external power supply is lower than a set value and to send control signals to the first PFC circuit and / or the first pre-charge circuit and / or the first inverter circuit according to the detection result. Also includes: The expansion enclosure has a single-phase power interface and an expansion output interface on its exterior. The integrated plug is located on one side of the expansion enclosure, and the integrated socket is located on the opposite side of the expansion enclosure. An expansion module is located inside the expansion box. The input terminal of the expansion module is connected to the external power supply through the single-phase power interface and to the input terminal of the first filter circuit. The output terminal of the expansion module is connected to the input terminal of the bypass control circuit through the expansion output interface, which is used to increase the capacity of the voltage regulation module. The compensation box is provided with a single-phase power interface and a compensation output interface on its exterior. An integrated plug is provided on one side of the compensation box, and an integrated socket is provided on the opposite side of the compensation box. A compensation module is located inside the compensation box. The input terminal of the compensation module is connected to the external power supply through the single-phase power interface and is also connected to the input terminal of the first filter circuit. The output terminal of the compensation module is connected to the input terminal of the bypass control circuit, and is used to perform reactive power compensation on the external power supply.

2. The power circuit management system according to claim 1, characterized in that, The expansion module includes: The second filtering circuit is connected to the external power supply through the single-phase power interface and is used to filter the external power supply. The second PFC circuit is connected to the control system and the second filter circuit, and is also connected to the second energy storage capacitor. It is used to rectify and boost the external power supply after filtering by the second filter circuit to obtain boosted DC power supply, and store the boosted DC power supply in the second energy storage capacitor. The second pre-charging circuit is located in the voltage regulating box and is respectively connected to the second PFC circuit and the control system. It is used to control the second PFC circuit to store the boosted DC power in the energy storage capacitor. The second inverter circuit, connected to the control system, the second energy storage capacitor and the bypass control circuit, is used to invert the boosted DC power stored in the second energy storage capacitor into AC power and output it to the bypass control circuit. The control system is further configured to send control signals to the second PFC circuit and / or the second precharge circuit and / or the second inverter circuit based on the detection results.

3. The power circuit management system according to claim 1, characterized in that, The compensation module has several compensation branches and relays that control the switches of each compensation branch. Each compensation branch is connected to the external power supply through the single-phase power interface, and the control system is connected to the relays.

4. The power circuit management system according to claim 1, characterized in that, Also includes: The treatment enclosure is provided with a single-phase power interface and a treatment output interface on its exterior. Power quality management module, the power quality management module includes: The third filter circuit is located inside the treatment box and connected to the external power supply through the single-phase power interface, and is used to filter the external power supply. An inductor filter circuit is installed inside the treatment box and connected to the third filter circuit, and is used to further filter the external power supply after the third filter circuit has filtered it. A rectifier circuit is located inside the treatment box and connected to the inductor filter circuit. It is used to rectify the external power supply filtered by the inductor filter circuit to obtain rectified DC power supply. A DC energy storage circuit is located inside the treatment box and connected to the rectifier circuit and the bypass control circuit. It stores the DC power rectified by the rectifier circuit and releases the stored rectified DC power to the bypass control circuit through the treatment output interface. The third pre-charging circuit is located inside the treatment box and connected between the third filter circuit and the inductor filter circuit. It is used to control the DC energy storage circuit to store the DC power rectified by the rectifier circuit.

5. The power circuit management system according to claim 4, characterized in that, The rectifier circuit has several bridge arms connected in parallel, and each bridge arm has four switching transistors connected in series. An input terminal is provided between the two middle switching transistors on each bridge arm, and the inductor filter circuit is connected to the input terminal; The two middle switches on each bridge arm are connected in parallel to form a parallel branch. Each parallel branch has two diodes connected in series. An output terminal is provided between the two diodes on each parallel branch. The DC energy storage circuit is connected to the output terminal.

6. The power circuit management system according to claim 1 or 2, characterized in that, The integrated socket provided in the expansion box is matched and connected with the integrated plug provided in the voltage regulating box, or the integrated plug provided in the expansion box is matched and connected with the integrated socket provided in the voltage regulating box.

7. The power circuit management system according to claim 1, characterized in that, The integrated socket provided in the compensation box is matched and connected with the integrated plug provided in the voltage regulating box, or the integrated plug provided in the compensation box is matched and connected with the integrated socket provided in the voltage regulating box.

8. The power circuit management system according to any one of claims 1-2 and 3-5, characterized in that, The integrated plug and the integrated socket are respectively provided with LN holes, communication holes and signal holes on opposite sides. The LN holes are used to set the single-phase power interface and the user load interface.

Images