Low-power-consumption alternating-current voltage regulating device

Abstract

The embodiment of the invention provides a low-power-consumption alternating-current voltage regulating device, which comprises a voltage regulating and stabilizing circuit, a first printed circuit board and a radiator, and is characterized in that the voltage regulating and stabilizing circuit is configured to regulate the output voltage of a distribution transformer to a standard voltage value through an alternating-current-to-alternating-current active voltage regulating circuit; the voltage regulating and stabilizing circuit consists of a plurality of groups of power devices, and voltage regulation is realized by controlling a switching time sequence of the plurality of groups of power devices; a first printed circuit board configured to arrange the plurality of groups of power devices on the back surface of the first printed circuit board; and the radiator is configured to transfer heat generated by the plurality of groups of power devices during working, the radiator is arranged below the back surface of the first printed circuit board through a plurality of crimping fixing pieces, and all the power devices are attached to the first surface of the radiator. The problems that an existing voltage regulation mode is low in response speed, high in loss and low in precision and cannot meet the existing high-quality requirement for electric energy quality are solved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the field of circuit technology, and in particular, to a low-power AC voltage regulator. Background Art

[0002] With the improvement of science and technology and people's living standards, a large number of diverse electrical equipment loads are connected to the power grid, which has brought a variety of power quality problems to the power grid. For example: rural power grids have many points, long lines and wide areas, and the randomness, seasonality and periodicity of the load are obvious. The overall power load rate is low, the peak-to-valley difference is large, and the annual average load rate is low. The low voltage problem during the peak power release period causes some household appliances to be unable to use normally; remote mountainous areas are vast and sparsely populated, and the power supply radius is too long, resulting in fluctuations in the terminal power supply voltage and poor power supply reliability; urban residents generally use high-power electrical equipment, resulting in large differences in power grid loads in different areas and at different times; distributed photovoltaic power generation is connected to the power grid in large quantities, causing large voltage fluctuations, three-phase imbalance, harmonics and other problems.

[0003] In response to the above-mentioned power quality problems, voltage regulating devices have appeared in the prior art. However, the inventors have found that most of the existing voltage regulation devices achieve voltage regulation stability through traditional methods such as mechanical voltage regulation or graded voltage regulation. These traditional voltage regulation methods have slow response speed, high loss, and low precision and cannot meet the existing high quality requirements for power quality, and still affect users' production and life. Summary of the invention

[0004] The embodiments described in the present disclosure provide a low power consumption AC voltage regulating device.

[0005] According to a first aspect of the present disclosure, a low-power AC voltage regulation device is provided, the device comprising: a voltage regulation and stabilizing circuit, a first printed circuit board, and a heat sink, wherein the voltage regulation and stabilizing circuit is configured to regulate the output voltage of a distribution transformer to a standard voltage value through an active voltage regulation circuit of an AC-to-AC converter, the voltage regulation and stabilizing circuit is composed of a plurality of power devices, and voltage regulation is achieved by controlling the switching timing of the plurality of power devices; the first printed circuit board is configured to arrange the plurality of power devices in a plane on the back of the first printed circuit board; the heat sink is configured to transfer heat generated by the plurality of power devices during operation, the heat sink is arranged below the back of the first printed circuit board through a plurality of crimping fixtures, and all the power devices are attached to the first surface of the heat sink, the crimping fixture is configured to allow the pins of each power device to pass through the first printed circuit board from the back of the first printed circuit board and be welded to the front of the first printed circuit board, while also installing and fixing the heat sink and the power device, the crimping fixture is arranged between the heat sink and the power device, and each crimping fixture corresponds to two power devices.

[0006] Optionally, the voltage regulating and stabilizing circuit includes at least one phase, and each phase includes four groups of power devices, a first inductor, a second inductor, a first capacitor, and a second capacitor, wherein every two groups of power devices in each phase are connected in series to obtain two series groups, one end of the first inductor is respectively coupled to the output voltage of the distribution transformer and one end of the first capacitor, the other end of the first inductor is respectively coupled to one end of the first series group and one end of the second series group, the other end of the first capacitor and the other end of the first series group are both coupled to the neutral voltage potential end, the other end of the second series group is respectively coupled to one end of the second inductor and one end of the second capacitor, the other end of the second capacitor is coupled to the neutral voltage potential end, and the other end of the second inductor is the output end of the voltage regulating and stabilizing circuit.

[0007] Optionally, all power devices included in the multiple groups of power devices are arranged in a matrix layout on the back of the first printed circuit board, with the first direction being the column direction and the second direction being the row direction, and a plane formed by the first direction and the second direction being parallel to the back of the first printed circuit board.

[0008] Optionally, the first inductor and the second inductor are arranged in sequence in the form of a first inductor and a second inductor on an extension line of the heat sink along the first direction and close to the first end of the heat sink, and the first inductor and the second inductor are connected to the front side of the first printed circuit board through a jumper.

[0009] Optionally, the device also includes: a driving board, wherein the driving board is arranged vertically on the front side of the first printed circuit board along the first direction, each column of power devices corresponds to a driving board, and each driving board is respectively arranged with corresponding pins for controlling each power device, and all driving boards are arranged in parallel along the second direction on the left or right side corresponding to the welding point of each column of power devices on the front side of the first printed circuit board, and the driving board is used to provide driving signals for the power devices in the voltage regulation and stabilization circuit.

[0010] Optionally, the second capacitors are arranged at intervals between different driving boards.

[0011] Optionally, the device also includes: a main control board, wherein the main control board is vertically arranged on the front side of the first printed circuit board by pin plugging, the main control board is arranged at the first edge of the first printed circuit board, and the main control board is used to control the working state of the low-power AC voltage regulation device.

[0012] Optionally, the device further comprises a relay, wherein the relay is configured to automatically control the disconnection and connection between the output voltage of the distribution transformer and the voltage regulating and stabilizing circuit.

[0013] Optionally, the device also includes: a second printed circuit board, wherein the second printed circuit board is arranged above the first inductor, and the front side of the second printed circuit board is higher than the front side of the first printed circuit board, and the relay and the first capacitor are arranged on the front side of the second printed circuit board.

[0014] Optionally, the device also includes: a heat exchanger, wherein the heat exchanger is arranged on the extension line of the second printed circuit board in the first direction and close to the first end of the second printed circuit board, the heat exchanger includes an upper heat exchanger and a lower heat exchanger, and the dividing surface of the upper heat exchanger and the lower heat exchanger is on the same plane as the first surface of the radiator.

[0015] Optionally, the device also includes a first fan and a second fan, wherein the first fan is located in the gap between the radiator and the inductor, and the second fan is located on the extension line of the upper heat exchanger along the first direction and close to the first end of the upper heat exchanger, so that the upper heat exchanger is located in the air duct of the second fan, and the air inlet of the second fan is the cooling air input port of the low-power AC voltage regulating device.

[0016] The low-power AC voltage regulator of the disclosed embodiment is an economical, low-power AC voltage regulator and voltage stabilizing device, wherein the voltage regulator and voltage stabilizing circuit adopts an active voltage regulation method of AC to AC, directly converts the output voltage of the distribution transformer in the power system to a standard voltage value, so that the user end can use a stable standard voltage without being affected by the voltage fluctuation of the power grid system. Among them, the AC to AC method can reduce the number of voltage conversion levels, greatly reducing power consumption. In addition, the voltage regulator and voltage stabilizing circuit enables voltage regulation by controlling the switching timing of multiple groups of power devices, that is, the circuit control using power electronic semiconductor control technology can achieve more accurate voltage regulation in real time, meeting the existing high quality requirements for power quality. In addition, when the voltage regulator and voltage stabilizing circuit is arranged on the first printed circuit board, the power device is arranged on the back of the first printed circuit board, and the heat sink is also fixed on the back of the circuit board by a crimping fixture. Such an arrangement not only has good heat dissipation, but also does not damage the circuit board, has high installation integration, high utilization, and is easy to disassemble the heat sink, making later testing and maintenance very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. It should be noted that the drawings described below only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure, wherein: Figure 1 A schematic diagram of a voltage regulating and stabilizing circuit according to an embodiment of the present disclosure is shown; Figure 2A schematic diagram showing a backside layout of a first printed circuit board in an embodiment of the present disclosure is shown; Figure 3 A side view of a low-power AC voltage regulator device according to an embodiment of the present disclosure is shown; Figure 4 A top view of a low-power AC voltage regulator device according to an embodiment of the present disclosure is shown; Figure 5 A schematic diagram showing the waveform of the voltage at the user end before and after the use of a low-power AC voltage regulating device according to an embodiment of the present disclosure is shown; The elements in the drawings are schematic and not drawn to scale. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work also fall within the scope of protection of the present disclosure.

[0019] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by a person skilled in the art to which the subject matter of the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the specification and the relevant art, and will not be interpreted in an idealized or overly formal form unless otherwise explicitly defined herein. As used herein, a statement that two or more parts are "connected" or "coupled" together shall mean that the parts are joined together directly or through one or more intermediate components.

[0020] For ease of description, spatially relative terms such as "upper", "lower", "left", "right", "top", "bottom", etc. may be used here to describe the spatial positional relationship between a device or element and other devices or elements as shown in the figure. For example, the terms "on...", "above...", "above...", "on the upper surface of...", "above", "positioned on..." or "positioned on top of..." etc. mean that a first element such as a first structure exists on a second element such as a second structure, wherein there may or may not be an intermediate element between the first element and the second element. The term "contact" means connecting a first element such as a first structure and a second element such as a second structure, and there may or may not be other elements at the interface of the two elements. It should be understood that spatially relative terms are intended to include different orientations in use or operation other than the orientation of the device described in the figure. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures" afterwards. Thus, the exemplary term "above..." may include both "above..." and "below..." orientations. The device may be otherwise oriented, rotated 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

[0021] In addition, terms such as “first” and “second” are used only to distinguish one component (or a part of a component) from another component (or another part of a component).

[0022] In order to reduce power consumption and achieve more accurate voltage regulation to meet the high quality requirements of power quality, the embodiment of the present application proposes a new voltage regulating and stabilizing circuit, which adjusts the output voltage of the distribution transformer to a standard voltage value through an active voltage regulating circuit of AC to AC, and the voltage regulating and stabilizing circuit is composed of multiple groups of power devices, and the precise voltage regulation is achieved by controlling the switching timing of multiple groups of power devices. Among them, the AC to AC method greatly reduces the power consumption compared with the existing multi-stage conversion method that still requires AC to DC conversion or DC to AC. The distribution transformer usually refers to the distribution transformer that sends electricity to the user end in the power supply system. When the voltage output by the distribution transformer is unstable (not the standard voltage value or differs greatly from the standard voltage value), the voltage regulation can be achieved by controlling the switching timing of multiple groups of power devices in the voltage regulating and stabilizing circuit in the embodiment of the present application to stabilize the output voltage to the standard voltage value, so that the user end can obtain a stable and standard power supply voltage to ensure high-quality power supply requirements. The standard voltage value can be 220VAC or 380VAC according to actual needs. In addition, it should be noted that in actual applications, due to differences in different application environments, there may be some errors, and it may not be strictly equal to the standard voltage value, but it is also relatively close to the standard voltage value and does not affect the beneficial effect of voltage regulation.

[0023] Figure 1 A schematic circuit diagram of a voltage regulating and stabilizing circuit 100 in a low-power AC voltage regulating device according to an embodiment of the present disclosure is shown. It should be noted that in actual applications, the voltage regulating and stabilizing circuit 100 includes at least one phase circuit, and may also be multi-phase. Figure 1 The circuit structure of the three phases is shown in FIG. 1 . The structure of each phase circuit is the same. A single phase (phase A) circuit is used as an example. Figure 1 As shown, phase A includes four groups of power devices (Q1, Q2, Q3, Q4), a first inductor AL1, a second inductor AL2, a first capacitor AC1, and a second capacitor AC2, wherein every two groups of power devices in each phase are connected in series to obtain two series groups ( Figure 1In the embodiment, Q1 and Q2 are connected in series as a first series group, and Q3 and Q4 are connected in series as a second series group), one end of the first inductor AL1 is respectively coupled to the output voltage of the distribution transformer and one end of the first capacitor AC1, and the output voltage of the distribution transformer is the input voltage Vi1 of the voltage regulating and stabilizing circuit in the embodiment of the present disclosure, the other end of the first inductor AL1 is respectively coupled to one end of the first series group (Q1 and Q2 series group) and one end of the second series group (Q3 and Q4 series group), the other end of the first capacitor AC1 and the other end of the first series group are both coupled to the neutral voltage potential terminal N, the other end of the second series group is respectively coupled to one end of the second inductor AL2 and one end of the second capacitor AC2, the other end of the second capacitor AC2 is coupled to the neutral voltage potential terminal N, and the other end of the second inductor AL2 is the output terminal VoA of the voltage regulating and stabilizing circuit. Similarly, the input of phase B is ViB, and the output is VoB. Phase B includes a first inductor BL1, a second inductor BL2, a first capacitor BC1, a second capacitor BC2, and four groups of power devices (Q1, Q2, Q3, and Q4). The input of phase C is ViC, and the output is VoC. Phase C includes a first inductor CL1, a second inductor CL2, a first capacitor CC1, a second capacitor CC2, and four groups of power devices (Q1, Q2, Q3, and Q4). It should be noted that in actual applications, Q1, Q2, Q3, and Q4 can all be composed of multiple power devices, the first inductor (AL1, BL1, CL1), and the second inductor (AL2, BL2, and CL2) can also be composed of multiple inductors, and the first capacitor (AC1, BC1, CC1) and the second capacitor (AC2, BC2, and CC2) can also be composed of multiple capacitors. Different numbers of power devices, capacitors, and inductors can be set according to actual power requirements, and the embodiments of the present disclosure are not limited thereto. The power device in the embodiment of the present disclosure is a transistor, which can be an insulated gate bipolar transistor (IGBT) or a transistor implemented by third-generation semiconductor materials. In addition, the voltage regulating and stabilizing circuit 100 in the embodiment of the present disclosure can make the terminal voltages of Q1, Q2, Q3, and Q4 lower, so that when selecting power devices in actual applications, power devices with lower withstand voltage values ​​can be selected, which can further reduce the loss and cost of the circuit.

[0024] Figure 1 The first inductor and the second inductor in the voltage regulating and stabilizing circuit are used to filter out the high-frequency components of the voltage and current at the input and output ends of the voltage regulating and stabilizing circuit. The directions of the multiple power devices included in each group of power devices are the same. The directions of the first group of power devices Q1 and the second group of power devices Q2 are opposite, and the directions of the third group of power devices Q3 and the fourth group of power devices Q4 are also opposite, that is, Q1 and Q2 are connected in series in reverse, and Q3 and Q4 are connected in series in reverse. In actual applications, Q1 and Q2 are connected in series with a common source, and Q3 and Q4 are also connected in series with a common source ( Figure 1). Combined Figure 1 The circuit principle of the voltage regulating and stabilizing circuit is explained as follows: when the input terminal (ViA, ViB, ViC) is a positive voltage relative to N, Q1 and Q3 work in a PWM modulation complementary state, Q2 and Q4 work in a conduction state, thereby generating a PWM modulated positive voltage with the second capacitor (AC2, BC2, CC2) terminal voltage as the fundamental wave between the output terminal (VoA, VoB, VoC) and N; when the input terminal (ViA, ViB, ViC) is a negative voltage relative to N, Q2 and Q4 work in a PWM modulation complementary state, Q1 and Q3 work in a conduction state, thereby generating a PWM modulated negative voltage with the second capacitor (AC2, BC2, CC2) terminal voltage as the fundamental wave between the output terminal (VoA, VoB, VoC) and N; if Q3 and Q4 are used as upper bridge arms and Q1 and Q2 are used as lower bridge arms, the output voltage can be adjusted by adjusting the PWM duty cycle of the power devices in the upper bridge arm and the lower bridge arm to reach a preset voltage value.

[0025] In addition, it should be noted that Figure 1 The voltage regulating and stabilizing circuit in the embodiment of the present invention is a boost circuit structure from the input end (ViA, ViB, ViC) to the output end (VoA, VoB, VoC), which is suitable for the case where the voltage at the output end of the distribution transformer is lower than the standard voltage value. For the case where the output end of the distribution transformer is higher than the standard voltage value, if (VoA, VoB, VoC) is used as the input end and ViA, ViB, ViC is used as the output end, the voltage reduction function can be realized, and the electric energy can be transmitted bidirectionally. Therefore, the voltage regulating and stabilizing circuit in the embodiment of the present invention can be applied to application scenarios where the output voltage of the distribution transformer is lower than the standard voltage value, and can also be applied to application scenarios where the output voltage of the distribution transformer is higher than the standard voltage value.

[0026] Furthermore, how to reasonably arrange the voltage regulating and stabilizing circuit 100 in the circuit board not only needs to consider issues such as heat dissipation and volume, but also the integration of the circuit board and subsequent maintenance. Therefore, how to reasonably arrange it in the circuit board and make it play its role better is crucial.

[0027] The embodiment of the present disclosure further provides a low-power AC voltage regulating device 200, comprising: the voltage regulating and stabilizing circuit 100 in the above-mentioned embodiment, a first printed circuit board PCB1, and a heat sink 210. The first printed circuit board PCB1 is configured to arrange multiple groups of power devices in a plane on the back side of the first printed circuit board PCB1; specifically, all power devices included in the multiple groups of power devices are arranged in a plane on the back side of the first printed circuit board PCB1 in a matrix layout, the first direction D1 is the column direction, the second direction D2 is the row direction, and the plane formed by the first direction D1 and the second direction D2 is parallel to the back side of the first printed circuit board PCB1.

[0028] For example, Figure 2 A schematic diagram of the backside layout of a first printed circuit board PCB1 according to an embodiment of the present disclosure is shown, wherein Figure 1 Every two groups of power devices (Q1 and Q2 and Q3 and Q4) connected in series in the medium voltage regulation circuit 100 are arranged as a row along the first direction D1 on the back side of the first printed circuit board PCB1, and different rows are arranged in parallel along the second direction D2 on the back side of the first printed circuit board PCB1. Figure 2 M can be represented as a single power device in each group of power devices, and 110, 120, and 130 correspond to different phases in the voltage regulating and stabilizing circuit 100 (for example, corresponding to Figure 1 In the embodiment of the present disclosure, the power devices in the voltage regulating and stabilizing circuit 100 are all installed in a plane, which is more conducive to heat dissipation. Figure 2 This is exemplary. In actual applications, the power devices may be arranged in a row by combining all the power devices in four groups of power devices, or combining the power devices in one group of power devices in one row. The specific arrangement may be adaptively adjusted according to actual conditions.

[0029] The heat sink 210 is configured to transfer the heat generated by the plurality of power devices during operation. Figure 3 is a side view of the low power AC voltage regulating device 200 in the second direction D2, as shown Figure 3 As shown, the heat sink 210 is arranged below the back side of the first printed circuit board PCB1 through a plurality of crimping fixtures 220, and all the power devices M are attached to the first surface S1 of the heat sink 210. The heat sink 210 in the embodiment of the present disclosure is an integrated heat sink 210 composed of a plurality of heat sinks. Figure 2 , 3As shown, the crimping fixture 220 is configured to allow the pins of each power device M to pass through the first printed circuit board PCB1 from the back side of the first printed circuit board PCB1 and be welded to the front side of the first printed circuit board PCB1, while also installing and fixing the heat sink 210 and the power device M. The crimping fixture 220 is arranged between the heat sink 210 and the power device M, and each crimping fixture 220 corresponds to two power devices M, that is, one crimping fixture 220 crimps two power devices M at the same time. The heat sink 210 in the disclosed embodiment is fixedly installed with the power device M and the first printed circuit board PCB1 by means of a crimping fixture 220. Specifically, the heat sink 210 and the crimping fixture 220 can be fixed by bolts. Compared with the method of fixing by screwing directly on the circuit board PCB1, this installation method will not damage the first printed circuit board PCB1, and the circuit board utilization rate is high. It is also easy to disassemble, and the heat sink 210 does not need to be taken with it when testing or repairing the circuit board. Compared with the method of soldering the circuit board to the heat sink 210 (which also requires the heat sink to be taken with it for repair), it is more convenient. In addition, the first printed circuit board PCB1 can be sealed with sheet metal, so that the heat sink 210 and the circuit can be completely sealed, and the cooling system is outside the enclosed space, and air cannot enter. Figure 3 As shown, a schematic diagram is given of the position of the plane S2 where the corresponding sealing strip is located when the sheet metal is sealed, that is, a part of the heat sink 210 is sealed together with the PCB1.

[0030] In addition, it should be noted that, during actual installation, the first surface S1 of the heat sink 210 needs to be padded with insulating thermally conductive materials, such as ceramic sheets and thermally conductive adhesive. Each power device corresponds to a ceramic sheet, and the ceramic sheet is coated with thermally conductive adhesive.

[0031] Figure 4 FIG. 2 is a top view of the front side (the side where the front side of PCB 1 is located) of the low power consumption AC voltage regulator 200. Figure 3-4 It can be seen that the first inductor (AL1, BL1, CL1) and the second inductor (AL2, BL2, CL2) in the voltage regulating and stabilizing circuit 100 are arranged in the form of the first inductor L1 and the second inductor L2 in sequence on the extension line of the heat sink 210 along the first direction D1 and close to the first end of the heat sink 210. This arrangement is to allow the first inductor L1 and the second inductor L2 to pass through the wind and dissipate heat for the first inductor L1 and the second inductor L2. The first inductor L1 and the second inductor L2 are connected to the front of the first printed circuit board through a jumper. (Specifically, they can be connected to the front of the first printed circuit board PCB1 through a terminal block).

[0032] The low power consumption AC voltage regulating device 200 of the embodiment of the present disclosure further includes a driving board 230, such as Figure 4As shown, the driving board 230 is vertically arranged on the front side of the first printed circuit board PCB1 along the first direction D1, each column of power devices corresponds to a driving board 230, each driving board 230 is respectively arranged with corresponding pins for controlling each power device, and all driving boards 230 are arranged in parallel along the second direction D2 at the welding points ( Figure 4 The position of the dotted line near the left or right side of the driving board 230 is the area where the power device welding point is located), and the driving board 230 is used to provide a driving signal for the power device in the voltage regulating and stabilizing circuit 100. The driving board 230 (driving bar) is used in the embodiment of the present disclosure to realize the time of signal arrival for each power device M independently, so as to avoid the delay difference of the signal caused by the different distances when controlling at the same time, thereby affecting the effect of the circuit.

[0033] like Figure 4 As shown, the second capacitors (AC2, BC2, CC2) in the voltage regulating and stabilizing circuit 100 are arranged at intervals between different driving boards 230.

[0034] The low power consumption AC voltage regulating device 200 of the embodiment of the present disclosure further includes a main control board 240, wherein Figure 3-4 As shown, the main control board 240 is arranged vertically on the front of the first printed circuit board PCB1 by pin plugging, and the main control board 240 is arranged at the first edge of the first printed circuit board PCB1. The main control board 240 is used to control the working state of the low-power AC voltage regulator 200. In the embodiment of the present disclosure, the main control board 240 is arranged by pin plugging, which is more convenient for early debugging and later maintenance.

[0035] The low-power AC voltage regulating device 200 of the embodiment of the present disclosure further includes a relay 250, which is configured to automatically control the disconnection and connection between the output voltage of the distribution transformer and the voltage regulating and stabilizing circuit 100. For example, when the output voltage of the distribution transformer is a standard voltage value, it can be automatically disconnected from the voltage regulating and stabilizing circuit 100, and when the output voltage of the distribution transformer is not stable at the standard voltage value, it can be automatically connected to the voltage regulating and stabilizing circuit 100. For another example, it is also necessary to automatically disconnect after a fault occurs in the voltage regulating and stabilizing circuit 100.

[0036] The low power consumption AC voltage regulating device 200 of the embodiment of the present disclosure further includes a second printed circuit board PCB2, such as Figure 3-4As shown, the second printed circuit board PCB2 is arranged above the first inductor L1, and the front side of the second printed circuit board PCB2 is higher than the front side of the first printed circuit board PCB1 (that is, the first printed circuit board PCB1 and the second printed circuit board PCB2 are staggered, which is beneficial to heat dissipation and can also reduce the volume of the entire device), and the relay 250 and the first capacitor (AC1, BC1, CC1) are arranged on the front side of the second printed circuit board PCB2.

[0037] The low power consumption AC voltage regulating device 200 of the embodiment of the present disclosure further includes: a heat exchanger 260, such as Figure 3-4 As shown, the heat exchanger is arranged on the extension line of the second printed circuit board PCB2 in the first direction D1 and close to the first end of the second printed circuit board PCB2 ( Figure 4 The heat exchanger includes an upper heat exchanger 261 and a lower heat exchanger 262, and a dividing surface S4 between the upper heat exchanger 261 and the lower heat exchanger 262 is on the same plane as the first surface of the radiator 210.

[0038] The low power consumption AC voltage regulating device 200 of the embodiment of the present disclosure further includes a first fan 270 and a second fan 280. Figure 3-4 In which, the first fan 270 is located in the gap between the radiator 210 and the first inductor L1, and the second fan 280 is located on the extension line of the upper heat exchanger 261 along the first direction D1 and close to the first end of the upper heat exchanger 261, so that the upper heat exchanger 261 is located in the air duct of the second fan 280, and the air inlet of the second fan 280 is the cooling air input port of the low-power AC voltage regulating device 200.

[0039] like Figure 4 As shown, IN1, IN2, and IN3 are respectively the input ends of the low-power AC voltage regulator 200, and OUT1, OUT2, and OUT3 are respectively the output ends of the low-power AC voltage regulator 200. Fuses 290 are arranged at both the input and output ends to protect the circuit system.

[0040] Finally, it should be noted that the devices in the low-power AC voltage regulator 200 in the embodiment of the present disclosure are all discrete devices. Compared with modular devices, they have low cost, large production output, low maintenance cost, are suitable for mass production, suitable for automated production, and are more flexible according to the application.

[0041] To further illustrate the beneficial effects of the embodiments of the present disclosure, Figure 5 FIG. 2 shows a schematic diagram of voltage waveforms at the user end corresponding to the voltage before and after the voltage is regulated by the low-power AC voltage regulating device 200 according to an embodiment of the present disclosure. Figure 5As shown, it is a waveform diagram of the user-end voltage changing with time over a period of time, wherein the horizontal axis is time, the vertical axis is voltage, line a is a waveform diagram of the user-end voltage before using the low-power AC voltage regulating device 200, and line b is a waveform diagram of the user-end voltage after using the low-power AC voltage regulating device 200. By comparing a and b, it can be seen that before using the low-power AC voltage regulating device 200, there are many periods of time when the voltage is lower than 200V. After using the low-power AC voltage regulating device 200, the voltage can be better stabilized at 220V, which greatly improves the power quality at the user end.

[0042] In summary, the low-power AC voltage regulator of the disclosed embodiment is an economical (low-cost), low-power AC voltage regulator and voltage stabilization device, which can accurately regulate and stabilize the voltage output by the distribution transformer, and greatly reduce the cost and power consumption, meeting the existing high quality requirements for power quality. Moreover, the reasonable layout makes the low-power AC voltage regulator better in terms of heat dissipation, volume, integration, side view, maintenance, etc., and further reduces the cost.

[0043] Unless the context clearly indicates otherwise, the singular form of the words used herein and in the appended claims includes the plural and vice versa. Thus, when referring to the singular, the plural form of the corresponding term is generally included. Similarly, the words "comprise" and "include" are to be interpreted as inclusive rather than exclusive. Likewise, the terms "include" and "or" should be interpreted as inclusive, unless such interpretation is expressly prohibited herein. Where the term "example" is used herein, particularly when it is placed after a group of terms, "example" is merely exemplary and illustrative and should not be considered exclusive or comprehensive.

[0044] Further aspects and scopes of adaptability become apparent from the description provided herein. It should be understood that various aspects of the present disclosure can be implemented individually or in combination with one or more other aspects. It should also be understood that the description and specific embodiments herein are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.

[0045] Several embodiments of the present disclosure are described in detail above, but it is obvious that those skilled in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the present disclosure. The protection scope of the present disclosure is defined by the attached claims.

Claims

1. A low-power AC voltage regulator, characterized in that: The device comprises: a voltage regulating and stabilizing circuit, a first printed circuit board, and a radiator. Wherein, the voltage regulating and stabilizing circuit is configured to regulate the output voltage of the distribution transformer to a standard voltage value through an active voltage regulating circuit for converting AC to AC, and the voltage regulating and stabilizing circuit is composed of multiple groups of power devices, and voltage regulation is achieved by controlling the switching timing of the multiple groups of power devices; The first printed circuit board is configured to arrange the plurality of power devices in a planar manner on the back side of the first printed circuit board; The heat sink is configured to transfer heat generated by the multiple groups of power devices during operation. The heat sink is arranged below the back side of the first printed circuit board through a plurality of crimping fixtures, and all the power devices are attached to the first surface of the heat sink. The crimping fixtures are configured to allow the pins of each power device to pass through the first printed circuit board from the back side and be welded to the front side of the first printed circuit board, while also installing and fixing the heat sink and the power device. The crimping fixtures are arranged between the heat sink and the power devices, and each crimping fixture corresponds to two power devices.

2. The low power consumption AC voltage regulating device according to claim 1, characterized in that: The voltage regulating and stabilizing circuit includes at least one phase, and each phase includes four groups of power devices, a first inductor, a second inductor, a first capacitor, and a second capacitor. Among them, every two groups of power devices in each phase are connected in series to obtain two series groups, one end of the first inductor is respectively coupled to the output voltage of the distribution transformer and one end of the first capacitor, the other end of the first inductor is respectively coupled to one end of the first series group and one end of the second series group, the other end of the first capacitor and the other end of the first series group are both coupled to the neutral voltage potential end, the other end of the second series group is respectively coupled to one end of the second inductor and one end of the second capacitor, the other end of the second capacitor is coupled to the neutral voltage potential end, and the other end of the second inductor is the output end of the voltage regulating and stabilizing circuit.

3. The low power consumption AC voltage regulating device according to claim 2, characterized in that: All power devices included in the multiple groups of power devices are arranged in a row-row layout on the back of the first printed circuit board, with the first direction being the column direction and the second direction being the row direction. The plane formed by the first direction and the second direction is parallel to the back of the first printed circuit board.

4. The low power consumption AC voltage regulating device according to claim 3, characterized in that: The first inductor and the second inductor are arranged in sequence in the form of a first inductor and a second inductor on an extension line of the heat sink along the first direction and close to a first end of the heat sink, and the first inductor and the second inductor are connected to the front side of the first printed circuit board through a jumper.

5. The low power consumption AC voltage regulating device according to claim 3, characterized in that: The device further comprises: a driving plate, Among them, the driving board is arranged vertically on the front side of the first printed circuit board along the first direction, each column of power devices corresponds to a driving board, and each driving board is respectively arranged with corresponding pins for controlling each power device, and all the driving boards are arranged in parallel along the second direction on the left or right side corresponding to the welding point of each column of power devices on the front side of the first printed circuit board, and the driving board is used to provide driving signals for the power devices in the voltage regulation and stabilization circuit.

6. The low power consumption AC voltage regulating device according to claim 5, characterized in that: The second capacitors are arranged at intervals between different driving boards.

7. The low power consumption AC voltage regulating device according to claim 2, characterized in that: The device also includes: a main control board, The main control board is vertically arranged on the front side of the first printed circuit board by means of pin insertion, and is arranged at the first edge of the first printed circuit board. The main control board is used to control the working state of the low-power AC voltage regulator.

8. The low power consumption AC voltage regulating device according to claim 4, characterized in that: The device also includes a relay, Wherein, the relay is configured to automatically control the disconnection and connection between the output voltage of the distribution transformer and the voltage regulating and stabilizing circuit.

9. The low-power AC voltage regulating device according to claim 8, characterized in that: The device further comprises: a second printed circuit board, The second printed circuit board is arranged above the first inductor, and the front side of the second printed circuit board is higher than the front side of the first printed circuit board. The relay and the first capacitor are arranged on the front side of the second printed circuit board.

10. The low power consumption AC voltage regulating device according to claim 9, characterized in that: The device also includes: a heat exchanger, The heat exchanger is arranged on the extension line of the second printed circuit board in the first direction and close to the first end of the second printed circuit board. The heat exchanger includes an upper heat exchanger and a lower heat exchanger. The dividing surface between the upper heat exchanger and the lower heat exchanger is on the same plane as the first surface of the radiator.

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