Transformer power supply circuit and power supply

Abstract

The utility model discloses a transformer power supply circuit, a control method, electronic equipment and a power supply, and relates to the field of transformer power supply, and the transformer power supply circuit comprises a multi-tap transformer, a plurality of groups of switches and a plurality of interconnection switches; one group of switches corresponds to one winding, and each group of switches comprises a first switch, a second switch, a third switch and a fourth switch. After each third switch and each fourth switch corresponding to the winding are switched off, the corresponding interconnection switch is switched on, and the series voltage regulator and the parallel voltage regulator of the phase are started, when it is detected that the parallel operation voltage of the winding is smaller than a preset threshold value, a load corresponding to the winding needs to be operated in series; and when it is detected that the series operation voltages of the two windings of the phase are both smaller than a preset threshold value, the third switch, the interconnection switch and the fourth switch corresponding to the two windings of the phase are disconnected. Under the condition that the output range is not changed, the circuit cost is reduced, and the overall utilization rate of the transformer winding is improved.

Description

Technical Field

[0001] This utility model relates to the field of transformer power supply, and in particular to a transformer power supply circuit and power supply. Background Technology

[0002] Because polysilicon reduction furnaces require high-power power supplies for system heating, the operating voltage range of these power supplies needs to be between 0-3000V. To reduce harmonic pollution to the power grid and improve the power factor, multi-tap transformers are typically used to implement thyristor superposition control for power supply to the polysilicon reduction furnace.

[0003] In existing technologies, such as Figure 1 As shown, the transformer power supply circuit uses a multi-tap transformer with five voltage taps in each winding. The commonly used power control method is to superimpose the operation of two adjacent voltage taps, so that the power output waveform is close to a sine wave, thereby reducing the generated harmonics. If the polysilicon reduction furnace runs for 120 hours, the voltage range and running time corresponding to each operating position of the polysilicon reduction furnace are shown in Table 1.

[0004] Table 1

[0005] Voltage range Operating gear Running time (hours) 1 1500-3000V 1-2 gears 15 2 1000-1500V 2-3 gears 25 3 700-1000V 3-4 gear 40 4 200-700V 4-5 gears 40 120

[0006] However, on the one hand, since polysilicon only requires a higher voltage to break down the gas in the initial stage of reduction, the time for the combined operation of the first and second speed settings is shorter than that of other speed settings when the polysilicon reduction furnace is running for a long time, resulting in a relatively low utilization rate for that speed setting. On the other hand, as the output voltage increases, the hardware cost of the transformer power supply circuit also increases.

[0007] Therefore, how to reduce circuit costs and improve the overall utilization rate of transformer windings while keeping the output range unchanged is an urgent problem to be solved. Utility Model Content

[0008] In view of this, the purpose of this utility model is to provide a transformer power supply circuit and power supply, so as to reduce the cost of the circuit and improve the overall utilization rate of the transformer windings while keeping the output range unchanged. The specific solution is as follows:

[0009] In a first aspect, this application discloses a transformer power supply circuit, including a parallel voltage regulator and a series voltage regulator, and further including: a multi-tap transformer, multiple sets of switches, and multiple tie switches; wherein, each phase of the multi-tap transformer includes two windings, namely an upper winding and a lower winding, and each winding includes multiple voltage taps; a set of switches corresponds to one winding, and each set of switches includes a first switch, a second switch, a third switch, and a fourth switch; one tie switch corresponds to one phase of the multi-tap transformer;

[0010] The first terminal of each first switch is connected to the output terminal of its corresponding parallel voltage regulator; the second terminal of each first switch is connected to the second terminal of its corresponding load.

[0011] The first terminal of each of the second switches is connected to the midpoint of its corresponding load, and the first terminal of each of the third switches is connected to the second terminal of its corresponding load. The second terminals of the second switches and the third switches of the same winding are connected, and their common point is connected to the voltage tap corresponding to any position of another winding of the same phase.

[0012] Each voltage tap is connected to the first end of its corresponding load via its corresponding series voltage regulator; the second end of each load is connected to the first or last end of its corresponding winding via its corresponding fourth switch to form a power supply circuit; wherein, the voltage tap corresponding to the first position of the upper winding is led out from the first end of the upper winding, and the voltage tap corresponding to the first position of the lower winding is led out from the last end of the lower winding.

[0013] The first end of each of the aforementioned interconnecting switches is connected to the tail end of the upper winding of the phase in which it is located, and the second end of each of the aforementioned interconnecting switches is connected to the head end of the lower winding of the phase in which it is located.

[0014] Optionally, it may also include multiple grounding detection devices; wherein one of the grounding detection devices corresponds to one phase of the multi-winding transformer;

[0015] The first end of each grounding detection device is connected to the tail end of the upper winding of the phase; the second end of each grounding detection device is connected to the first end of the lower winding of the phase; and the third end of each grounding detection device is grounded.

[0016] Optionally, the multi-tap transformer is a three-phase transformer, and each winding of the multi-tap transformer includes four voltage taps.

[0017] Optionally, the second end of the second switch in the same winding and the second end of the third switch in the same winding are connected, and their common point is connected to the voltage tap corresponding to the first position of the other winding in the same phase.

[0018] Optionally, the series voltage regulator includes: a first resistor, a second resistor, a first capacitor, a first diode, a second diode, a first fuse, and a second fuse;

[0019] The first terminal of the first capacitor, the first terminal of the first fuse, and the first terminal of the second fuse are connected together, and their common terminal is connected to the input terminal of the series voltage regulator and its corresponding voltage tap.

[0020] The first end of the first resistor and the first end of the second resistor are connected to the second end of the first capacitor;

[0021] The second end of the first fuse is connected to the anode of the first diode;

[0022] The second end of the second fuse is connected to the cathode of the second diode;

[0023] The second end of the first resistor, the second end of the second resistor, and the cathode of the first diode are all connected to the anode of the second diode, and their common terminal is connected to the first end of the corresponding load as the output terminal of the series voltage regulator.

[0024] Optionally, the parallel voltage regulator includes: a third fuse, a third resistor, a fourth resistor, a second capacitor, a third diode, and a fourth diode;

[0025] The first end of the third fuse is connected to the input terminal of the parallel voltage regulator and its corresponding voltage tap; the first end of the second capacitor, the anode of the third diode, and the cathode of the fourth diode are connected to the second end of the third fuse;

[0026] The first end of the third resistor and the first end of the fourth resistor are connected to the second end of the second capacitor;

[0027] The second end of the third resistor, the second end of the fourth resistor, the cathode of the third diode, and the anode of the fourth diode are connected together, and their common end is connected as the output end of the parallel voltage regulator and the first end of its corresponding first switch.

[0028] Secondly, this application discloses a power supply, including the transformer power supply circuit described above.

[0029] As can be seen from the above, this scheme can achieve an output voltage range above the preset threshold, which meets the operating requirements of the polysilicon reduction furnace, by superimposing the output voltage of the corresponding tap of the winding onto the output voltage of each tap of the same phase winding through the connection switch between the closed windings. Disconnecting the connection switch between the windings allows each winding to operate independently, achieving an output voltage range below the preset threshold. Therefore, it ensures that the output voltage range of the circuit will not shrink due to the reduction of voltage taps. Furthermore, because the high voltage taps required by the polysilicon reduction furnace are replaced by the coordinated work between the same phase windings, the utilization rate of the remaining taps is greatly improved, and the overall utilization rate of the transformer windings is also increased. Therefore, the multi-tap transformer in this scheme can maintain the same supply voltage range while reducing the number of voltage taps in each winding, thus reducing hardware costs. Moreover, because the maximum output voltage corresponding to each winding is also reduced accordingly, the power supply cost also decreases. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This application discloses a prior art transformer power supply circuit;

[0032] Figure 2 This application discloses a transformer power supply circuit;

[0033] Figure 3 This is a circuit diagram of a series voltage regulator disclosed in this application;

[0034] Figure 4 This is a circuit diagram of a parallel voltage regulator disclosed in this application. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Because polysilicon reduction furnaces require high-power power supplies for system heating, the operating voltage range of these power supplies needs to be between 0-3000V. To reduce harmonic pollution to the power grid and improve the power factor, multi-tap transformers are typically used to implement thyristor superposition control for power supply to the polysilicon reduction furnace.

[0037] In existing technologies, multi-tap transformers used in transformer power supply circuits have five voltage taps on each winding. A common power control method involves superimposing adjacent voltage taps to make the power output waveform approximate a sine wave, thus reducing harmonics. However, on the one hand, since polysilicon only requires a higher voltage to break down the gas during the initial reduction stage, the time for superimposed operation of taps 1-2 is shorter than other taps when the polysilicon reduction furnace is running for extended periods, resulting in relatively low utilization of that tap. On the other hand, as the output voltage increases, the hardware cost of the transformer power supply circuit also increases.

[0038] Therefore, this application provides a transformer power supply circuit and a transformer power supply circuit control method to reduce circuit cost and improve the overall utilization rate of transformer windings while keeping the output range unchanged.

[0039] See Figure 2 As shown, this embodiment discloses a transformer power supply circuit, including a parallel voltage regulator and a series voltage regulator, and further including: a multi-tap transformer, multiple sets of switches, and multiple tie switches; wherein, each phase of the multi-tap transformer includes two windings, namely an upper winding and a lower winding, and the windings include multiple voltage taps; a set of switches corresponds to one winding, and each set of switches includes a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4; a tie switch corresponds to one phase of the multi-tap transformer;

[0040] The first terminal of each first switch K1 is connected to the output terminal of its corresponding parallel voltage regulator; the second terminal of each first switch K1 is connected to the second terminal of its corresponding load.

[0041] The first end of each second switch K2 is connected to the midpoint of its corresponding load, and the first end of each third switch K3 is connected to the second end of its corresponding load. The second ends of the second switches K2 and K3 of the same winding are connected, and their common point is connected to the voltage tap corresponding to any position of another winding of the same phase.

[0042] Each voltage tap is connected to the first end of its corresponding load through its corresponding series voltage regulator; the second end of each load is connected to the first or last end of its corresponding winding through its corresponding fourth switch K4 to form a power supply circuit; wherein, the voltage tap corresponding to the first position of the upper winding is led out from the first end of the upper winding, and the voltage tap corresponding to the first position of the lower winding is led out from the last end of the lower winding.

[0043] The first terminal of each tie switch is connected to the tail end of the upper winding of the phase, and the second terminal of each tie switch is connected to the first end of the lower winding of the phase.

[0044] In this embodiment, when preparing for the operation of the transformer power supply circuit, it is first necessary to disconnect the corresponding third switch K3 and the corresponding fourth switch K4 of the winding, and close the corresponding tie switch so that each winding can operate independently at the beginning of operation.

[0045] like Figure 2As shown, each secondary winding of the current transformer contains four taps. Table 2 shows the tap voltages and selectable ranges for each tap in this embodiment. It can be seen that, compared to the original transformer's tap voltages and selectable ranges, the tap voltages provided by each tap in this embodiment are less than the voltage range required by the polysilicon reduction furnace. Therefore, it is necessary to achieve the aforementioned voltage range by closing and opening each switch.

[0046] Table 2

[0047] gear Original transformer tap voltage V Optional range V In this embodiment, the transformer tap voltage V Optional range V 1 3000 2650-3000 1500 1250-1500 2 1550 1000-1550 1000 750-1000 3 900 700-900 750 450-750 4 700 500-700 380 180-380 5 400 200-400

[0048] In this embodiment, by disconnecting the third switch K3 and the fourth switch K4 and closing the corresponding connecting switch, the two secondary windings of the current phase can be connected in series, allowing the two secondary windings to operate in tandem and superimpose the voltage range of the series connection, thus achieving the voltage range corresponding to the first voltage level of the original transformer as shown in the table above. For example, for Figure 2 In phase A, the tap voltage is the same as the transformer tap voltage in this embodiment in Table 2 above. For the two secondary sides of phase A, when the tie switch of phase A and the third switch K3 and fourth switch K4 corresponding to the current secondary winding are closed, if the third switch K3 is connected to the first tap of the other secondary winding in the same direction, the voltage of each tap corresponding to the current secondary winding becomes: 1st tap 1500+1500=3000V, 2nd tap 1000+1500=2500V, 3rd tap 750+1500=2250V, and 4th tap 380+1500=1880V. This allows the voltage regulator to output a voltage range of 0-3000V, which meets the selectable range of the original transformer.

[0049] In this embodiment, the silicon rod is connected in series as a load to the power supply system of the polycrystalline silicon reduction furnace, providing a location and carrier for the polycrystalline silicon production process. When current is input into the polycrystalline silicon reduction furnace, the silicon rod heats up due to its own resistance, causing the temperature in the reduction furnace to rise to about 1000°C, providing high-temperature conditions for the reduction reaction of trichlorosilane to ensure the reaction can proceed smoothly. However, as the production process progresses, the diameter of the silicon rod gradually increases, further leading to a gradual decrease in the resistance of the silicon rod. Therefore, from room temperature to high temperature, as the diameter of the silicon rod increases, the resistance of the silicon rod changes significantly during the production process, decreasing from hundreds of kΩ to tens of mΩ. The multi-tap transformer has multiple taps, and by switching the taps, the output voltage can be changed to ensure that a suitable voltage is provided at different stages of the silicon rod resistance change, maintaining stable heating power and meeting the power requirements of different stages of the polycrystalline silicon production process.

[0050] In this embodiment, the multi-tap transformer has multiple phases: phase A, phase B, and phase C. Each phase includes two secondary windings: an upper winding and a lower winding. Each winding corresponds to four taps, from 1 to 4, i.e., four voltage taps. Phases B and C follow the same principle. The first tap corresponding to each upper winding is led out from the beginning of the upper winding, while the first tap corresponding to each lower winding is led out from the end of the lower winding. For example... Figure 2 As shown, this multi-tap transformer has three phases. Each winding is connected to a corresponding load in the polysilicon reduction furnace via series and parallel voltage regulators, and each phase has the same structure. For example, the upper winding of phase A is the secondary winding corresponding to A1, and the lower winding is the secondary winding corresponding to A2. The beginning of winding A1 (slot 1) is connected to the load side of A2 via the A1 interconnecting line, and the end of winding A2 (slot 1) is connected to the load side of A1 via the A2 interconnecting line. Since phases A1 and A2 operate together, a dedicated grounding monitoring device and three grounding sampling points are provided: A1 grounding sampling, A2 grounding sampling, and A total grounding sampling, to distinguish the grounding status of A1 and A2 during operation. It can be understood that an A1 switch is provided on the N1 line of phase A1, and an A2 switch is provided on the N2 line of phase A2, serving as isolation during startup and interconnected operation.

[0051] In this embodiment, the series voltage regulator is connected in series with the load. It can automatically adjust its voltage drop according to changes in the input voltage and load, ensuring a stable output voltage. For example, when the input voltage increases, the series voltage regulator increases its voltage drop to offset the increase and keep the output voltage constant; conversely, when the input voltage decreases, it decreases its voltage drop to maintain a stable output voltage. Furthermore, the series voltage regulator can also control the current in the circuit by adjusting its resistance value, preventing excessive current from damaging the load.

[0052] In this embodiment, the parallel voltage regulator typically serves as a backup to the series voltage regulator. When the main voltage regulator fails or requires maintenance, the parallel voltage regulator can quickly take over, continuing to provide a stable voltage to the load, ensuring normal circuit operation and improving power supply reliability. In some cases, the parallel voltage regulator can work in conjunction with the series voltage regulator to jointly regulate the system voltage. By adjusting the output voltage of the parallel voltage regulator, the system voltage can be fine-tuned to meet the needs of different loads. For example, when the load in the system changes, the parallel voltage regulator can adjust its output voltage according to the actual situation, keeping the system voltage within a suitable range. In circuits with multiple loads operating in parallel, the parallel voltage regulator can also balance the loads. By rationally distributing voltage and current according to the needs of each load, each load can operate evenly, avoiding situations where some loads are overloaded while others are lightly loaded.

[0053] It should be noted that not every series voltage regulator for every range needs to be connected to a parallel voltage regulator. For example, Figure 2 Only voltage regulators in parallel are installed for settings 1 and 2. This is because the polysilicon reduction furnace production process has different voltage requirements at different stages. During startup or specific process steps, a high voltage is needed to establish reaction conditions instantaneously. If the series voltage regulator cannot meet this requirement alone, a parallel voltage regulator is needed to provide high voltage range support for settings 1 and 2, thus satisfying the high voltage requirements of each process stage. Furthermore, parallel voltage regulators are typically used in special cases where the corresponding series voltage regulator cannot meet the voltage demand. They also adjust quickly to avoid prolonged operation at the high-energy-consuming settings 1 or 2, achieving a balance between energy consumption and production needs, and ensuring economical system operation.

[0054] Furthermore, the voltage taps of each position on the secondary winding are connected in series with the load via series voltage regulators, while the voltage taps corresponding to the first and second positions are also connected in parallel with the load via parallel voltage regulators. It should be noted that the heating voltage requirements for the silicon rods in the reduction furnace are extremely stringent at different stages of polysilicon production. Although multi-tap transformers can provide multiple voltage levels, continuous and precise voltage regulation is difficult to achieve simply by switching voltage taps. Adding series voltage regulators directly to the voltage taps and the load allows for continuous fine-tuning based on the multi-tap transformer's output voltage, achieving more precise output voltage regulation and more accurately meeting process requirements, thus ensuring the stability and quality of silicon rod growth.

[0055] As can be seen from the above, this scheme can achieve an output voltage range above the preset threshold, which meets the operating requirements of the polysilicon reduction furnace, by superimposing the output voltage of the corresponding tap of the winding onto the output voltage of each tap of the same phase winding through the connection switch between the closed windings. Disconnecting the connection switch between the windings allows each winding to operate independently, achieving an output voltage range below the preset threshold. Therefore, it ensures that the output voltage range of the circuit will not shrink due to the reduction of voltage taps. Furthermore, because the high voltage taps required by the polysilicon reduction furnace are replaced by the coordinated work between the same phase windings, the utilization rate of the remaining taps is greatly improved, and the overall utilization rate of the transformer windings is also increased. Therefore, the multi-tap transformer in this scheme can maintain the same supply voltage range while reducing the number of voltage taps in each winding, thus reducing hardware costs. Moreover, because the maximum output voltage corresponding to each winding is also reduced accordingly, the power supply cost also decreases.

[0056] To distinguish between grounding situations of different windings in the same phase, this embodiment discloses a specific transformer power supply circuit, which also includes multiple grounding detection devices; wherein, one grounding detection device corresponds to one phase of a multi-winding transformer;

[0057] The first end of each grounding detection device is connected to the tail end of the upper winding of the phase in which it is located; the second end of each grounding detection device is connected to the first end of the lower winding of the phase in which it is located; and the third end of each grounding detection device is grounded.

[0058] It should be noted that since different loads may have different operating characteristics and fault modes, it is necessary to distinguish the grounding situation of each load in order to accurately locate the grounding position, prevent the disorderly conduction of fault current, and avoid multiple loads from being in danger at the same time.

[0059] In this embodiment, when two windings of the same phase are connected in operation, the grounding status of the two loads of the same phase cannot be distinguished. Therefore, a special grounding monitoring device is needed to differentiate the grounding status of different loads and achieve accurate location of the grounding point. It is understood that the aforementioned grounding monitoring device can be...

[0060] As can be seen from the above, by connecting a grounding detection device to the tail end of the upper winding and the head end of the lower winding of a multi-winding transformer, the grounding location can be accurately located.

[0061] To reduce transformer costs, this embodiment discloses a specific transformer power supply circuit. The multi-tap transformer is a three-phase transformer, and each winding of the multi-tap transformer contains four voltage taps.

[0062] In this embodiment, as Figure 2 As shown, a multi-tap transformer is a three-phase transformer, and each winding contains four voltage taps. It is understandable that the three-phase windings of a multi-tap transformer have the same circuit structure.

[0063] It should be noted that the current multi-tap transformers can work together with the windings in the same direction. Even if the number of voltage taps is reduced, the same voltage range can still be achieved as in existing multi-tap transformers where each winding has five voltage taps.

[0064] As shown above, reducing the number of voltage taps in the commonly used multi-tap transformer from five to four reduces the number of components and busbars required for each tap, thus lowering the power supply cost. Furthermore, the reduced voltage for each tap significantly decreases the number of turns in each winding, reducing the amount of coil and core material used, shrinking the transformer size, reducing no-load and load losses, and consequently reducing the amount of insulation material used, thereby lowering the transformer cost.

[0065] To improve the power supply voltage range of each gear, this embodiment discloses a specific transformer power supply circuit. The second terminal of the second switch K2 and the second terminal of the third switch K3 of the same winding are connected, and their common point is connected to the voltage tap corresponding to the first gear of the other winding of the same phase.

[0066] In this embodiment, the common terminal of the second switch K2 and the third switch K3 of the winding is connected to the voltage tap corresponding to the first tap of another winding in the same phase. It is understood that when the winding cannot provide sufficient voltage when operating independently, closing the second switch K2 or the third switch K3 enables coordinated operation with the other winding in the same phase. That is, the output voltage of each tap of the winding is the sum of the tap voltage and the output voltage of the first tap of the other winding in the same phase.

[0067] As can be seen from the above, by closing the second switch K2 or the third switch K3, the series operation between different positions of the same phase winding can be realized, so as to improve the voltage range that each position can output.

[0068] In order to regulate the output voltage, such as Figure 3 As shown, this embodiment discloses a specific transformer power supply circuit, the series voltage regulator includes: a first resistor R1, a second resistor R2, a first capacitor C1, a first diode V1, a second diode V2, a first fuse F1 and a second fuse F2;

[0069] The first terminal of the first capacitor C1, the first terminal of the first fuse F1, and the first terminal of the second fuse F2 are connected together, and their common terminal is connected as the input terminal of the series voltage regulator and its corresponding voltage tap.

[0070] The first terminal of the first resistor R1 and the first terminal of the second resistor R2 are connected to the second terminal of the first capacitor C1;

[0071] The second end of the first fuse F1 is connected to the anode of the first diode V1;

[0072] The second terminal of the second fuse F2 is connected to the cathode of the second diode V2;

[0073] The second end of the first resistor R1, the second end of the second resistor R2, and the cathode of the first diode V1 are all connected to the anode of the second diode V2. Their common terminal is connected to the first end of the corresponding load as the output terminal of the series voltage regulator.

[0074] In this embodiment, the first capacitor C1 has the characteristic of blocking DC and passing AC, which can affect the voltage distribution in the AC circuit. The first resistor R1 and the second resistor R2 are connected in series or in parallel, which can change the total resistance of the circuit. According to Ohm's law, this affects the current and the voltage across the load, thus achieving a certain degree of voltage regulation. The first diode V1 and the second diode V2 are both bidirectional trigger diodes, which can conduct when the voltage reaches the trigger value, changing the conduction state of the circuit and controlling the voltage output.

[0075] In addition, the first capacitor C1 can filter out high-frequency noise in the power supply, making the output voltage smoother and reducing the impact of power supply interference on the load. When the power supply voltage fluctuates, the voltage fluctuation can be compensated to a certain extent by combining components such as resistors and capacitors, reducing the impact of fluctuation on the load equipment.

[0076] In this embodiment, the series voltage regulator also ensures that the components in the circuit are not damaged. The first fuse F1 and the second fuse F2 will melt and disconnect the circuit when an overload or short circuit causes excessive current, protecting other components from damage. When the bidirectional trigger diode is conducting, it can limit the voltage, preventing the load equipment from experiencing excessive voltage and providing overvoltage protection.

[0077] In this embodiment, since the output voltage of the first gear is relatively large, an additional capacitor is required in series with the first capacitor C1 as a redundancy design to improve the safety of the design. If one capacitor fails, the other capacitor can continue to maintain the basic function of the circuit to a certain extent, preventing the voltage regulator from completely failing, buying time for repair and replacement of faulty components, and improving the availability of the entire system.

[0078] As can be seen from the above, the DC blocking and AC passing characteristics of the first capacitor C1 can affect the voltage distribution of the AC circuit, and the series and parallel connection of the first and second resistors can change the total resistance to regulate the load voltage. The first and second bidirectional trigger diodes conduct when the voltage reaches the trigger value, controlling the voltage output. Therefore, the purpose of regulating the output voltage can be achieved.

[0079] To maintain a stable output voltage, such as Figure 4 As shown, this embodiment discloses a specific transformer power supply circuit, and the parallel voltage regulator includes: a third fuse F3, a third resistor R3, a fourth resistor R4, a second capacitor C2, a third diode V3, and a fourth diode V4;

[0080] The first terminal of the third fuse F3 is connected to the input terminal of the parallel voltage regulator and its corresponding voltage tap; the first terminal of the second capacitor C2, the anode of the third diode V3 and the cathode of the fourth diode V4 are connected to the second terminal of the third fuse F3.

[0081] The first terminal of the third resistor R3 and the first terminal of the fourth resistor R4 are connected to the second terminal of the second capacitor C2.

[0082] The second end of the third resistor R3, the second end of the fourth resistor R4, the cathode of the third diode V3, and the anode of the fourth diode V4 are connected together, and their common terminal is connected as the output terminal of the parallel voltage regulator and the first terminal of its corresponding first switch K1.

[0083] In this embodiment, both the third diode V3 and the fourth diode V4 are bidirectional trigger diodes. When the power supply voltage rises to their trigger voltage, either the third diode V3 or the fourth diode V4 conducts, bypassing part of the current and thus maintaining the voltage across the load at a certain level. The second capacitor C2 can store and release electrical energy, charging or discharging in a timely manner when the power supply voltage fluctuates, smoothing the voltage waveform and further stabilizing the load voltage.

[0084] Furthermore, when the load current changes, the parallel resistor network consisting of the third resistor R3 and the fourth resistor R4 can redistribute the current. If the load current increases, the parallel resistor network can allow more current to pass through itself, stabilizing the load voltage; if the load current decreases, it can reduce current shunting and maintain voltage stability.

[0085] It should be noted that because the output voltage corresponding to the first gear is relatively large, the series voltage regulator corresponding to the first gear needs to add a capacitor connected in series with the second capacitor C2 to achieve complementary functions. One capacitor is used to influence the voltage distribution in the AC circuit, playing a role in voltage regulation by utilizing its DC blocking and AC passing characteristics; the other capacitor is used to store and release electrical energy, smoothing the voltage waveform and playing a key role in stabilizing the voltage. The two complement each other, jointly improving the circuit performance.

[0086] As can be seen from the above, the third diode V3 and the fourth diode V4 can conduct when the output voltage is too high, bypassing part of the current to stabilize the load voltage. The second capacitor C2 can store and release electrical energy, smoothing the voltage waveform and stabilizing the load voltage. When the load current changes, the parallel network composed of the third and fourth resistors redistributes the current to maintain the stability of the load voltage.

[0087] Finally, this embodiment provides a power supply, including the transformer power supply circuit described above.

[0088] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A transformer power supply circuit, comprising a parallel voltage regulator and a series voltage regulator, characterized in that, Also includes: The system includes a multi-tap transformer, multiple sets of switches, and multiple tie switches. Each phase of the multi-tap transformer comprises two windings, an upper winding and a lower winding, and each winding contains multiple voltage taps. Each set of switches corresponds to one winding, and each set of switches includes a first switch, a second switch, a third switch, and a fourth switch. Each tie switch corresponds to one phase of the multi-tap transformer. The first terminal of each first switch is connected to the output terminal of its corresponding parallel voltage regulator; the second terminal of each first switch is connected to the second terminal of its corresponding load. The first terminal of each of the second switches is connected to the midpoint of its corresponding load, and the first terminal of each of the third switches is connected to the second terminal of its corresponding load. The second terminals of the second switches and the third switches of the same winding are connected, and their common point is connected to the voltage tap corresponding to any position of another winding of the same phase. Each voltage tap is connected to the first end of its corresponding load via its corresponding series voltage regulator; the second end of each load is connected to the first or last end of its corresponding winding via its corresponding fourth switch to form a power supply circuit; wherein, the voltage tap corresponding to the first position of the upper winding is led out from the first end of the upper winding, and the voltage tap corresponding to the first position of the lower winding is led out from the last end of the lower winding. The first end of each of the aforementioned interconnecting switches is connected to the tail end of the upper winding of the phase in which it is located, and the second end of each of the aforementioned interconnecting switches is connected to the head end of the lower winding of the phase in which it is located.

2. The transformer power supply circuit according to claim 1, characterized in that, It also includes multiple grounding detection devices; wherein, one of the grounding detection devices corresponds to one phase of the multi-winding transformer; The first end of each grounding detection device is connected to the tail end of the upper winding of the phase; the second end of each grounding detection device is connected to the first end of the lower winding of the phase; and the third end of each grounding detection device is grounded.

3. The transformer power supply circuit according to claim 1, characterized in that, The multi-tap transformer is a three-phase transformer, and each winding of the multi-tap transformer contains four voltage taps.

4. The transformer power supply circuit according to claim 3, characterized in that, The second end of the second switch in the same winding and the second end of the third switch in the same winding are connected, and their common point is connected to the voltage tap corresponding to the first position of the other winding in the same phase.

5. The transformer power supply circuit according to any one of claims 1 to 4, characterized in that, The series voltage regulator includes: a first resistor, a second resistor, a first capacitor, a first diode, a second diode, a first fuse, and a second fuse; The first terminal of the first capacitor, the first terminal of the first fuse, and the first terminal of the second fuse are connected together, and their common terminal is connected to the input terminal of the series voltage regulator and its corresponding voltage tap. The first end of the first resistor and the first end of the second resistor are connected to the second end of the first capacitor; The second end of the first fuse is connected to the anode of the first diode; The second end of the second fuse is connected to the cathode of the second diode; The second end of the first resistor, the second end of the second resistor, and the cathode of the first diode are all connected to the anode of the second diode, and their common terminal is connected to the first end of the corresponding load as the output terminal of the series voltage regulator.

6. The transformer power supply circuit according to any one of claims 1 to 4, characterized in that, The parallel voltage regulator includes: a third fuse, a third resistor, a fourth resistor, a second capacitor, a third diode, and a fourth diode; The first end of the third fuse is connected to the input terminal of the parallel voltage regulator and its corresponding voltage tap; the first end of the second capacitor, the anode of the third diode, and the cathode of the fourth diode are connected to the second end of the third fuse; The first end of the third resistor and the first end of the fourth resistor are connected to the second end of the second capacitor; The second end of the third resistor, the second end of the fourth resistor, the cathode of the third diode, and the anode of the fourth diode are connected together, and their common end is connected as the output end of the parallel voltage regulator and the first end of its corresponding first switch.

7. A power supply, characterized in that, Includes the transformer power supply circuit as described in any one of claims 1 to 6.

Images